JP2015172265A - Sheet manufacturing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet manufacturing device capable of manufacturing a sheet having high strength and favorable recyclability.SOLUTION: A sheet manufacturing device has a fibrillating part which fibrillates a material to be fibrillated into a fiber form, and it manufactures a sheet by binding the fibrillated fibers via resin. A coverage rate of the resin in the sheet is equal to or greater than 25% and equal to or less than 86%.

Description

  The present invention relates to a sheet manufacturing apparatus.

  It has been practiced for a long time to deposit a fibrous substance and obtain a sheet-like or film-like molded body by applying a binding force between the deposited fibers. A typical example is the production of paper by paper making using water (paper making). Even now, the papermaking method is widely used as one of the methods for producing paper. Paper manufactured by papermaking is generally structured such that cellulose fibers derived from, for example, wood are entangled with each other and partially bound to each other by a binder (paper strength enhancer (starch glue, water-soluble resin, etc.)) Many have

  For example, Patent Document 1 describes a waste paper fiber molded product in which a synthetic resin (binder) is blended by about 9% by weight with respect to waste paper fiber, and imparts practically sufficient strength to the molded product. It is stated that it can.

JP-A-7-003603

  However, when the resin is mixed with the fiber as in the technique disclosed in Patent Document 1, if the resin is not uniformly dispersed, the distribution of the resin that bonds the fibers is biased. The location which does not couple | bond between a location and a fiber arises. This phenomenon becomes significant when the resin is agglomerated. In this case, the resin only coats the fiber thickly at the portion where the resin bonds the fibers. That is, in a location where there is a large amount of resin, the resin functions as a structure that connects the fibers rather than the function of bonding the fibers.

  On the other hand, if the amount of resin is increased relative to the amount of fibers, the strength of the sheet can be increased. However, when a new sheet is manufactured (recycled) from such a sheet, it is included in the raw material sheet. There is a problem that it becomes difficult to unravel the fibers to be disassembled, it becomes difficult to disentangle, the resin cannot be separated from the fibers at the time of disentanglement, and the amount of resin in the manufactured sheet increases, making it difficult to recycle.

  One of the objects according to some aspects of the present invention is to provide a sheet manufacturing apparatus capable of manufacturing a sheet having high strength and good recyclability.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following aspects or application examples.

One aspect of the sheet manufacturing apparatus according to the present invention has a defibrating unit for defibrating a material to be defibrated,
A sheet manufacturing apparatus that manufactures a sheet by binding defibrated fibers and fibers via a resin, wherein a coverage of the resin in the sheet is 25% or more and 86% or less. To do.

Such a sheet manufacturing apparatus can easily manufacture a sheet having a sufficiently high strength because the coverage of the sheet to be manufactured is 25% or more. In addition, such a sheet manufacturing apparatus has a coverage of the manufactured sheet of 86% or less, and can suppress the amount of resin to be blended, so that when such a sheet is used as a raw material, the sheet is defibrated. In this case, it is easy to separate the fiber and the resin, and it is possible to easily recycle and manufacture the sheet while suppressing an excessive amount of the resin.

  In the sheet manufacturing apparatus according to the present invention, the resin may be contained in an amount of 8% by mass to 60% by mass with respect to the sheet.

  According to such a sheet manufacturing apparatus, it is possible to more easily manufacture a sheet that has a resin coverage of 25% or more and 86% or less and that is easier to recycle.

  In the sheet manufacturing apparatus according to the present invention, when the content of the resin with respect to the sheet is 10% by mass or less, the sheet may contain an aggregation inhibitor.

  According to such a sheet manufacturing apparatus, since the aggregation inhibitor is contained, aggregation of the resin is suppressed and the resin is uniformly dispersed in the fiber. Therefore, even if the resin content is small, it is easy to produce a sheet with a high coverage.

  One aspect of the sheet according to the present invention is characterized in that a coverage of the resin in a sheet in which fibers are bound via a resin is 25% or more and 86% or less.

  According to such a sheet, since the coverage of the sheet is 25% or more, the strength is sufficiently high. Moreover, such a sheet | seat is easy to isolate | separate the bound fiber and resin whose coverage in a sheet | seat is 86% or less, and is easy to recycle.

The schematic diagram of the sheet manufacturing apparatus which concerns on embodiment. The figure of the sheet concerning an embodiment.

  Several embodiments of the present invention will be described below. The embodiments described below illustrate examples of the present invention. The present invention is not limited to the following embodiments, and includes various modified embodiments that are implemented within a range that does not change the gist of the present invention. Note that not all of the configurations described below are essential configurations of the present invention.

1. Sheet Manufacturing Apparatus The sheet manufacturing apparatus according to the present embodiment includes at least a defibrating unit 20. FIG. 1 is a schematic diagram showing a sheet manufacturing apparatus 100 according to the present embodiment.

1.1. The defibrating unit The defibrating unit 20 defibrates the material to be defibrated. The defibrating unit 20 generates a defibrated material that has been unraveled into a fibrous shape by defibrating the material to be defibrated. Further, the defibrating unit 20 also has a function of separating particulate substances such as resin particles, ink, toner, and anti-bleeding agent attached to the material to be defibrated from the fibers.

Here, the “defibrating treatment” refers to unraveling a material to be defibrated in which a plurality of fibers are bound into individual fibers. What has passed through the defibrating unit 20 is referred to as “defibrated material”. In addition to the unraveled fibers, the “defibrated material” includes resin particles separated from the fibers when unraveling the fibers (resin for binding multiple fibers), ink, toner, and anti-bleeding material. In some cases, the ink particles may be included. The shape of the defibrated material that has been unraveled is a string shape or a ribbon shape. The unraveled fiber may exist in an unentangled state (independent state) with other unraveled fibers, or entangled with other unraveled fibers (so-called “ It may exist in a state of forming a “dama”.

  In the present specification, in the sheet manufacturing apparatus 100, “upstream” with respect to the flow (including conceptual flow) of the material (raw material, material to be defibrated, defibrated material, web, sheet, etc.) of the sheet to be manufactured. "," Downstream ", etc. may be used. The expression “upstream side (downstream side)” is used to relatively specify the position of the configuration. For example, when “A is on the upstream side (downstream side) of B”, A Is located upstream (downstream) with respect to the position B in the direction of flow of the sheet material.

  The defibrating unit 20 is optional as long as it has a function of defibrating an object to be defibrated. The defibrating unit 20 defibrates in a dry manner in the atmosphere (in the air). In the illustrated example, the defibrated material introduced from the introduction port 21 is defibrated by the defibrating unit 20 to become a defibrated material (fiber), and the defibrated material discharged from the discharge port 22 is transferred to the pipe 82. It becomes a mode to be discharged.

  Moreover, in this specification, dry means not in liquid but in the atmosphere (in the air). The dry category includes a dry state and a state where a liquid present as an impurity or a liquid added intentionally exists.

  The configuration of the defibrating unit 20 is not particularly limited. For example, the defibrating unit 20 includes a rotating unit (rotor) and a fixing unit that covers the rotating unit, and a gap (gap) is formed between the rotating unit and the fixing unit. be able to. When the defibrating unit 20 is configured in this way, the defibrating process is performed by introducing the material to be defibrated into the gap while the rotating unit is rotated. Further, in this case, the number of rotations, the shape of the rotating part, the shape of the fixed part, and the like can be appropriately designed according to the requirements of the properties of the sheet to be manufactured and the overall apparatus configuration. Further, in this case, the rotation speed of the rotating part (number of rotations per minute (rpm)) is the throughput of the defibrating process, the residence time of the defibrated material, the degree of defibrating, the size of the gap, the rotating part, It can be set appropriately in consideration of conditions such as the shape and size of the fixed part and other members.

  It is more preferable that the defibrating unit 20 has a function of generating an air flow that sucks the material to be defibrated and / or discharges the defibrated material. In this case, the defibrating unit 20 can suck the defibrated material together with the airflow from the introduction port 21 with the airflow generated by itself, perform the defibrating process, and transport the defibrated material to the discharge port 22. In the case of using the defibrating unit 20 that does not have an airflow generation mechanism, a mechanism that generates an airflow that guides the material to be defibrated to the introduction port 21 and an airflow that sucks out the defibrated material from the discharge port 22 is removed. There is no problem even if it is provided.

1.1.1. In the present specification, the defibrated material refers to an article containing the raw material of the sheet manufacturing apparatus 100, for example, pulp sheet, paper, waste paper, tissue paper, kitchen paper, cleaner, filter, liquid An absorbent material, a sound absorber, a buffer material, a mat, a cardboard, or the like, in which fibers are intertwined or bound. In this specification, the material to be defibrated may be a sheet manufactured by the sheet manufacturing apparatus 100 or the used sheet (old sheet) after use. For defibrated materials, rayon, lyocell, cupra, vinylon, acrylic, nylon, aramid, polyester, polyethylene, polypropylene, polyurethane, polyimide, carbon, glass, metal fibers (organic fiber, inorganic fiber, organic fiber, etc.) Inorganic composite fibers) may be included. Moreover, in the sheet manufacturing apparatus 100 of this embodiment, when the classification part 30 mentioned later is provided, especially used paper, an old sheet, etc. can be used effectively as a material to be defibrated.

1.1.2. Defibrated material In the sheet manufacturing apparatus 100 of the present embodiment, the defibrated material is used as part of the material of the sheet to be manufactured. The defibrated material includes fibers obtained by defibrating the above-described material to be defibrated, and as such fibers, natural fibers (animal fibers, plant fibers), chemical fibers (organic fibers, inorganic fibers, organic-inorganic composite fibers) ) And the like. More specifically, the fibers contained in the defibrated material include fibers made of cellulose, silk, wool, cotton, cannabis, kenaf, flax, ramie, jute, manila hemp, sisal hemp, conifer, hardwood, etc. May be used as appropriate, or may be used by mixing as appropriate, or may be used as a regenerated fiber after purification. The defibrated material is a material for the sheet to be produced, but it is sufficient that it contains at least one of these fibers. In addition, the defibrated material (fiber) may be dried, or may be contained or impregnated with a liquid such as water or an organic solvent. Furthermore, the defibrated material (fiber) may be subjected to various surface treatments.

  When the fibers contained in the defibrated material used in the present embodiment are independent fibers, the average diameter (if the cross section is not a circle, the length in the direction perpendicular to the longitudinal direction) Among these, the diameter of the circle when assuming the largest one or a circle having an area equal to the area of the cross section (equivalent circle diameter)) is 1 μm or more and 1000 μm or less on average, preferably 2 μm or more and 500 μm or less, More preferably, it is 3 μm or more and 200 μm or less.

  The length of the fiber contained in the defibrated material used in the present embodiment is not particularly limited, but as an independent single fiber, the length along the longitudinal direction of the fiber is 1 μm or more and 5 mm or less, preferably Is 2 μm or more and 3 mm or less, more preferably 3 μm or more and 2 mm or less. When the length of the fiber is short, it is difficult to bind with the resin, so that the strength of the sheet may be insufficient. However, a sheet having sufficient strength can be obtained within the above range. The average length of the fibers is 20 μm or more and 3600 μm or less, preferably 200 μm or more and 2700 μm or less, more preferably 300 μm or more and 2300 μm or less, as a length-length weighted average fiber length. Furthermore, the length of the fiber may have variation (distribution).

  In this specification, when referring to a fiber, it may refer to a single fiber and may refer to an aggregate of a plurality of fibers (for example, a state like cotton), and when referred to as a defibrated material, It refers to a material containing a plurality of fibers, and includes the meaning of a collection of fibers and the meaning of a material (powder or cotton-like object) that is a raw material of a sheet.

  The defibrated material that has passed through the defibrating unit 20 is mixed with the resin before being formed into a sheet shape. Although the mode of mixing is arbitrary, it can mix easily by providing the mixing part 80 which is mentioned later.

1.1.3. Binding The sheet manufacturing apparatus 100 of the present embodiment manufactures a sheet by binding fibers and fibers of the defibrated material that has passed through the above-described defibrating unit 20 via a resin.

  In this specification, “binding the fiber and the resin” means that the fiber is not easily separated from the resin, or the resin is disposed between the fibers, and the fibers are separated from each other via the resin. A state that is difficult. The binding is a concept including adhesion, and includes a state in which two or more kinds of objects are difficult to come into contact with each other. Moreover, when a fiber and a fiber are bound via a resin, the fiber and the fiber may be parallel or intersect, or a plurality of fibers may be bound to one fiber.

In the sheet manufacturing apparatus 100 of the present embodiment, the mechanism for binding fibers to each other is not particularly limited as long as the fibers can be bonded by melting or softening the resin. As a structure to bind, a heat press, a heat roller, etc. are mentioned, for example. In the example shown in FIG.
As an example of such a configuration, a binding portion 50 including a heater roller 56 is employed.

  The binding part 50 is disposed after at least the above-described defibrated material and the resin are mixed. The binding part 50 has a function of molding the mixed fibers (defibrated material) and the resin, that is, the mixed material into a predetermined shape. In the fiber and resin molded body (sheet) molded in the binding portion 50, the fiber and the resin are in a bound state.

  In the binding part 50, a plurality of fibers are bound via the resin by applying heat to the mixed fiber and resin (mixed material). If the resin is a thermoplastic resin, heating it to a temperature above its glass transition temperature (softening point) or melting point (for crystalline polymers) will cause the resin to soften or melt and become entangled with the fibers. It deforms and flows into a solid and then solidifies as the temperature drops. The resin softens and comes into contact with the fibers so as to be intertwined, and the resin is solidified, whereby the fibers and the composite can be bound to each other. Further, when other fibers are bound when solidifying, the fibers are bound to each other.

  The resin may be a thermosetting resin. However, when the manufactured sheet is recycled, it is difficult to reuse the binding force, and thus it is preferable that the resin is not a thermosetting resin. When a thermosetting resin is used, the fiber and the resin can be bound by heating to a temperature higher than the softening point or higher than the curing temperature (temperature at which a curing reaction occurs). Further, the melting point, softening point, curing temperature, etc. of the resin are preferably lower than the melting point, decomposition temperature, carbonization temperature of the fiber, and it is preferable to select both types in combination so as to have such a relationship.

  Further, in the binding portion 50, in addition to applying heat to the mixed material, pressure may be applied. In that case, the binding portion 50 has a function of forming the mixed material into a predetermined shape. become. Although the magnitude | size of the applied pressure is suitably adjusted with the kind of sheet | seat shape | molded, it can be 50 kPa or more and 30 MPa or less, for example. If the applied pressure is small, a sheet with a high porosity is obtained, and if it is large, a sheet with a low porosity (high density) is obtained. Further, when the mixed material is formed in a web shape, it may be compressed so as to be about 1/5 to 1/100 of the thickness, and the porosity is adjusted by the degree of compression. May be.

  In the example shown in FIG. 1, the binding portion 50 is configured by a heater roller 56. The heater roller 56 can bind the fibers to each other with a resin by applying heat and pressure to the mixed material. The binding unit 50 may be configured by a hot press molding machine, a hot plate, a hot air blower, an infrared heater, a flash fixing unit, or the like, or may include a calendar roller.

1.2. Other configurations 1.2.1. Mixing Unit The sheet manufacturing apparatus 100 according to the present embodiment may include a mixing unit 80. The mixing unit 80 has a function of mixing the fiber (fiber material) of the defibrated material that has passed through the defibrating unit 20 and the resin. In the mixing unit 80, components other than the fibers and the resin may be mixed. Further, the resin may be a composite with other components. A composite refers to particles that are formed integrally with another resin as a main component. The “other” refers to a colorant, an aggregation inhibitor, and the like, and includes those having a shape, size, material, and function different from those of the main resin. In addition, the term “coloring material” in the present specification includes the case where the substance itself that can color the sheet is used, and the case that it indicates a set of particles (powder) made of the substance that can color the sheet.

In the present specification, “mixing fibers and resin” means that the resin is positioned between the fibers in a space (system) having a constant volume.

  As long as the mixing part 80 can mix a fiber (fiber material) and resin, the structure, a structure, a mechanism, etc. will not be specifically limited. Further, the mode of mixing processing in the mixing unit 80 may be batch processing (batch processing), sequential processing, or continuous processing. Further, the mixing unit 80 may be operated manually or automatically. Furthermore, the mixing unit 80 mixes at least the fiber and the resin, but may mix other components.

  Examples of the mixing process in the mixing unit 80 include mechanical mixing and hydrodynamic mixing. Mechanical mixing includes, for example, a method in which fibers (defibrated material) and a composite are introduced into a Henschel mixer and agitated, a method in which fibers and composites are enclosed in a bag, and the bag is shaken. Is mentioned. Examples of the hydrodynamic mixing process include a method in which fibers (defibrated material) and a resin are introduced into an airflow such as the atmosphere and diffused in the airflow. In the method of introducing the fibers and the resin into the airflow such as the atmosphere, the resin may be introduced into a pipe or the like in which the fibers are flowed (transferred) by the airflow, or the resin particles are flowed (transferred) by the airflow. The fiber may be put into a pipe or the like. In the case of such a method, it is more preferable that the airflow in the pipe or the like is turbulent because mixing efficiency may be improved.

  When the mixing unit 80 is provided in the sheet manufacturing apparatus 100, the mixing unit 80 is downstream of the defibrating unit 20 in the flow direction of the raw material (a part thereof) in the sheet manufacturing apparatus 100, and the defibrated material is It is provided on the upstream side of the structure bound by the resin. Further, another configuration may be included between the mixing unit 80 and the defibrating unit 20. As such another configuration, for example, the classification unit 30 and the like can be cited. In addition, the mixture (this may be called "mixing material") mixed by the mixing part 80 may be further mixed by other structures, such as the dispersion | distribution part 60. FIG.

  As shown in FIG. 1, as the mixing unit 80, when the tube 86 as described above is used as the mixing unit 80 for transferring fibers, the resin is introduced in a state where the fibers are flowed by an air current such as the atmosphere. There is a way. As a means for generating an air flow in the case where the pipe 86 is employed in the mixing unit 80, a blower (not shown) or the like can be used.

  In the case where the pipe 86 is employed in the mixing unit 80, the resin can be introduced by opening / closing the valve or by the operator's hand, but a screw feeder or a disk feeder (not shown) as the resin supply unit 87 shown in FIG. Etc. can be used. Use of these feeders is more preferable because fluctuations in the resin content (addition amount) in the airflow direction can be reduced. The same applies to the case where the resin is transferred by an air flow and fibers (defibrated material) are introduced into the air flow.

  In the sheet manufacturing apparatus 100 of the present embodiment, it is preferable that the mixing unit 80 is a dry type. Here, “dry” in mixing refers to a state of mixing in air (atmosphere) instead of underwater. That is, the mixing unit 80 may function in a dry state, or may function in a state where a liquid that exists as an impurity or a liquid that is intentionally added exists. In the case where the liquid is intentionally added, it is preferable to add the liquid in an amount that does not increase the energy and time for removing the liquid by heating or the like in the subsequent step.

The processing capacity of the mixing unit 80 is not particularly limited as long as fibers (defibrated material) and resin can be mixed, and can be appropriately designed and adjusted according to the manufacturing capacity (throughput) of the sheet manufacturing apparatus 100. . The processing capacity of the mixing unit 80 can be adjusted by changing the size of the processing container, the charged amount, etc. in the case of batch processing. It can be carried out by changing the flow rate of gas for transferring fibers and resin, the amount of material introduced, the amount transferred, and the like.

  The resin supply unit 87 supplies the resin from the supply port 88 to the pipe 86 in the air. That is, the resin supply unit 87 supplies the resin to the path through which the defibrated material flows (between the sorting unit 40 and the dispersion unit 60 in the illustrated example). Although it will not specifically limit as the resin supply part 87 if a composite_body | complex can be supplied to the pipe | tube 86, A screw feeder, a circle feeder, etc. are used. As a result of the fiber and resin passing through the tube 86, a mixture is formed. Therefore, in the sheet manufacturing apparatus 100 of this embodiment, the mixing unit 80 is configured to include the resin supply unit 87 and the pipe 86. In addition, since the mixed material may be further mixed in the dispersion unit 60 described later, the dispersion unit 60 may be regarded as the mixing unit 80.

1.2.2. Rough crushing section The sheet manufacturing apparatus 100 of the present embodiment may have a crushing section 10. The crushing unit 10 is, for example, a shredder. The crushing unit 10 cuts the raw material of the sheet manufacturing apparatus 100 of the present embodiment in the air before introducing the raw material into the defibrating unit 20. Although the shape and size of the strip are not particularly limited, for example, it is a strip of several cm square. In the illustrated example, the crushing unit 10 has a crushing blade 11, and the charged raw material can be cut by the crushing blade 11. The crushing unit 10 may be provided with an automatic input unit (not shown) for continuously supplying raw materials.

  The strips cut by the crushing unit 10 are received by the hopper 15 and then conveyed to the defibrating unit 20 via the pipe 81. The tube 81 communicates with the introduction port 21 of the defibrating unit 20.

1.2.3. Classification unit The sheet manufacturing apparatus 100 according to the present embodiment classifies an impurity (toner or paper strength enhancer) or a fiber (short fiber) shortened by defibration from a defibrated material in the air. You may have.

  The classification unit 30 separates and removes resin particles and ink particles from the defibrated material. As the classifying unit 30, an airflow classifier can be used. The airflow classifier generates a swirling airflow and separates it according to the size and density of what is classified as centrifugal force, and the classification point can be adjusted by adjusting the velocity and centrifugal force of the airflow. Specifically, a cyclone, an elbow jet, an eddy classifier, or the like is used as the classification unit 30. In particular, since the structure of the cyclone is simple, it can be suitably used as the classification unit 30. Below, the case where a cyclone is used as the classification part 30 is demonstrated.

  The classifying unit 30 has at least an introduction port 31, a lower discharge port 34 provided in the lower portion, and an upper discharge port 35 provided in the upper portion. In the classifying unit 30, the airflow on which the defibrated material introduced from the introduction port 31 is moved circumferentially, whereby centrifugal force is applied to the introduced defibrated material, and the first classified material ( Unbound fibers) and second classified products (resin particles, ink particles, etc.) that are smaller than the first classified product and have a lower density. In the example shown in the figure, the first classified product is discharged from the lower discharge port 34 and is introduced into the introduction port 46 of the sorting unit 40 through the pipe 83. On the other hand, the second classified product is discharged from the upper discharge port 35 through the pipe 84 to the outside of the classification unit 30. Thus, even when a resin-containing sheet is used as a raw material, the resin particles in the defibrated material are discharged to the outside by the classification unit 30, so that even if new resin is supplied by the resin supply unit 87, It is possible to prevent the resin from becoming excessive with respect to the fibers in the fiber.

In addition, although it described that it isolate | separates into a 1st classified product and a 2nd classified product by the classification part 30, it cannot necessarily isolate | separate correctly. A relatively small or low density of the first classified product may be discharged to the outside together with the second classified product. Among the second classified products, those having a relatively high density and those entangled with the first classified product may be introduced into the sorting unit 40 together with the first classified product. In addition, when the raw material is not waste paper but a pulp sheet, the classification unit 30 may not be provided as the sheet manufacturing apparatus 100 because the material corresponding to the second classified product is not included.

1.2.4. Sorting Unit The sheet manufacturing apparatus 100 according to the present embodiment may include a sorting unit 40. The sorting unit 40 sorts long fibers (long fibers) or undefibrated pieces that have not been sufficiently defibrated from the defibrated material in the air. The sorting unit 40 sorts the defibrated material that has been defibrated into “passing matter” that passes through the sorting unit 40 and “residue” that does not pass through in the air.

  When the selection unit 40 is employed in the sheet manufacturing apparatus 100 of the present embodiment, a sieve can be used. As shown in FIG. 1, the sorting unit 40 has an introduction port 46 and a discharge port 47. The sorting unit 40 is a rotary sieve that passes through a sieve that passes through the sieve and does not pass through a sieve that cannot pass through the sieve. The sorting unit 40 can sort fibers (passed material) shorter than a certain length from the defibrated material that has been defibrated by a sieve.

  As shown in FIG. 1, the residue that has not passed through the sieve of the sorting unit 40 is discharged from the discharge port 47, transported to the hopper 15 through a pipe 85 as a return channel, and is again defibrated. You may make it return to. The passing material that has passed through the sieve of the sorting unit 40 is received by the hopper 16 and then conveyed through the pipe 86.

1.2.5. Dispersion Unit and Sheet Forming Unit The sheet manufacturing apparatus 100 according to the present embodiment may include a dispersion unit 60 and a sheet forming unit 70. The dispersion unit 60 drops the mixed material while dispersing it in the air. The dispersion unit 60 causes the defibrated material and the resin (mixed material) to fall on the accumulation unit 72 of the sheet forming unit 70.

  The dispersion | distribution part 60 loosens the entangled passage thing. Furthermore, when the resin supplied from the resin supply unit 87 is in a fibrous form, the dispersion unit 60 loosens the entangled resin. In addition, the dispersion unit 60 uniformly deposits the passing material and the resin on the accumulation unit 72 of the sheet forming unit 70 described later. As the dispersing unit 60, a sieve is used. The dispersion unit 60 is a rotary sieve that can be rotated by a motor (not shown).

  The dispersion unit 60 has an introduction port 66. The difference in configuration between the dispersing unit 60 and the sorting unit 40 is that it does not have a discharge port (a portion corresponding to the discharge port 47 of the sorting unit 40). The upper limit of the opening size of the sieve of the dispersion part 60 is 5 mm. By setting the size of the mesh opening to 5 mm or less, it is possible to loosen and allow the fibers to be entangled without passing them. Even if there are fibers or resin entangled in the pipe 86 (in the mixing section 80), they are loosened when passing through the dispersion section 60. For this reason, the fibers and the resin are deposited on the deposition section 72 described later with a uniform thickness and density to form a web.

  “Unraveling intertwined fibers” means that the intertwined fibers are completely unraveled (when all fibers are unraveled) and a part of the intertwined fibers so that the intertwined fibers can pass through the sieve. To loosen. The same applies to the meaning of “releasing entangled resin”. “Uniformly deposited” refers to a state in which deposited deposits are deposited with the same thickness and the same density. However, since not all the deposits are manufactured as a sheet, it is sufficient that the portion to be a sheet is uniform.

The defibrated material and the resin that have passed through the dispersion unit 60 are deposited on the deposition unit 72 of the sheet forming unit 70. As shown in FIG. 1, the sheet forming unit 70 includes a stacking unit 72, a stretching roller 74, and a tension roller 77. The sheet forming unit 70 can form a web (sheet) using the defibrated material and the resin that have passed through the dispersing unit 60. In this example, a heater roller 56 as the binding unit 50 is incorporated in the sheet forming unit 70. That is, the binding part 50 may be a part of the sheet forming part 70.

  The accumulation part 72 of the sheet forming part 70 is located below the dispersion part 60. The accumulation part 72 receives a defibrated material and resin, and is a mesh belt, for example. A mesh stretched by a stretch roller 74 is formed on the mesh belt. The deposition unit 72 moves as the stretching roller 74 rotates. A web having a uniform thickness is formed on the deposition portion 72 by the defibrated material and the resin continuously falling from the dispersion portion 60 while the deposition portion 72 continuously moves.

  The defibrated material and the resin accumulated on the accumulation part 72 of the sheet forming part 70 are heated and pressurized by passing through the heater roller 56 as the accumulation part 72 moves. By heating, the resin functions as a binder to bind the fibers together, and is thinned by pressurization to form a sheet. Further, the surface may be smoothed by passing through a calendar roller (not shown). In the illustrated example, the formed (bound) sheet is wound up by a winding roller 92 of the winding unit 90. Thus, a sheet can be manufactured.

1.2.8. Others The sheet manufacturing apparatus 100 according to the present embodiment may appropriately include a configuration other than those described above. As such a configuration, a process is performed on the sheet formed by the binding unit 50, and a drying unit that dries the sheet as necessary, and the formed sheet is cut into a standard size. Examples of the cutting unit include a packaging unit that wraps a wound or cut sheet with a film, wrapping paper, or the like.

1.3. Resin In the sheet manufacturing apparatus 100 of the present embodiment, the resin used as a part of the raw material (supplied by the resin supply unit 87) may be either particulate or fibrous, but easily entangled with the fiber. In terms of point, a fibrous form is preferred. The resin may be supplied as a powder.

  The type of resin may be either a natural resin or a synthetic resin, and may be either a thermoplastic resin or a thermosetting resin, but the sheet manufacturing apparatus 100 using a sheet manufactured by the sheet manufacturing apparatus 100 of the present embodiment as a raw material. In the case of manufacturing a sheet by (when manufacturing a recycled sheet), it is preferable to use a thermoplastic resin, and a thermosetting resin is not suitable because it is difficult to exert its binding force again. In the sheet manufacturing apparatus 100 of the present embodiment, the resin is preferably solid at room temperature, and a thermoplastic resin is more preferable from the viewpoint of binding the fibers by heat in the binding portion 50.

  Examples of natural resins include rosin, dammar, mastic, copal, phlegm, shellac, phlebotomy, sandalac, colophonium, etc., and those that are used alone or as appropriate mixed, and these are appropriately modified. Also good.

  Among the synthetic resins, examples of the thermosetting resin include thermosetting resins such as phenol resin, epoxy resin, melamine resin, urea resin, unsaturated polyester resin, alkyd resin, polyurethane, and thermosetting polyimide resin.

Among the synthetic resins, thermoplastic resins include AS resin, ABS resin, polypropylene, polyethylene, polyvinyl chloride, polystyrene, acrylic resin, polyester resin, polyethylene terephthalate, polyphenylene ether, polybutylene terephthalate, nylon, polyamide, polycarbonate, Examples include polyacetal, polyphenylene sulfide, polyether ether ketone, and the like. These resins may be used alone or in combination. In addition, copolymerization and modification may be performed, and such resin systems include styrene resins, acrylic resins, styrene-acrylic copolymer resins, olefin resins, vinyl chloride resins, and polyester resins. Examples thereof include resins, polyamide resins, polyurethane resins, polyvinyl alcohol resins, vinyl ether resins, N-vinyl resins, styrene-butadiene resins, and the like. Moreover, what melt | dissolves or softens resin below 200 degreeC is preferable, and what melt | dissolves or softens below 160 degreeC is more preferable from a viewpoint of energy saving.

  The resin may be in the form of a fiber having a so-called core-sheath structure. In this case, the sheath is more preferable because it melts at a lower temperature than the core and exhibits a binding function, and the core can function as a fiber. Examples of the resin having a core-sheath structure include ETC, INTAK series manufactured by ES Fiber Vision Co., Ltd., polyester fiber Tetron (registered trademark) for dry nonwoven fabric manufactured by Teijin Fibers Limited, and the like. Further, the fiber diameter of the resin having the core-sheath structure is preferably 0.5 to 2.0 dtex from the viewpoint of obtaining a sufficient binding force. The fiber length of the core-sheath resin is preferably 1 mm or more and 10 mm or less from the viewpoint of sheet formability and sheet strength.

1.3.1. Colorant The resin may have a colorant integrally. Further, the resin may integrally have an aggregation inhibitor. In the present specification, an aspect in which the resin integrally includes these substances may be referred to as a composite.

  The state in which the composite body integrally includes the resin and the colorant means that the resin or the colorant from the composite body does not easily fall apart (or hardly fall off) in the sheet manufacturing apparatus 100 and / or in the manufactured sheet. It means a state. That is, the state in which the composite has the resin and the colorant integrally includes the state in which the colorant is adhered to the resin, the state in which the colorant is structurally (mechanically) fixed to the resin, and the coloration with the resin It means that the material is agglomerated due to electrostatic force, van der Waals force or the like, and that the resin and the colorant are chemically bonded. The state in which the composite has the resin and the colorant integrally may be a state in which the colorant is encapsulated in the resin or a state in which the colorant is attached to the resin, and a state in which the two states exist simultaneously. including.

  The coloring material has a function of setting a predetermined color of the sheet manufactured by the sheet manufacturing apparatus 100 of the present embodiment. As the colorant, a dye or a pigment can be used, and it is preferable to use a pigment from the viewpoint of obtaining better hiding power and color developability when the composite is integrated with a resin.

  The color and type of the pigment are not particularly limited. For example, various colors (white, blue, red, yellow, cyan, magenta, yellow, black, special colors (pearl, metal, etc.) used in general inks. (Gloss) etc.) can be used. The pigment may be an inorganic pigment or an organic pigment. As the pigment, known pigments described in JP 2012-87309 A and JP 2004-250559 A can be used. In addition, white pigments such as zinc white, titanium oxide, antimony white, zinc sulfide, clay, silica, white carbon, talc, and alumina white may be used. These pigments may be used singly or may be used in combination as appropriate. In the case of using a white pigment, among those exemplified above, it is possible to use a pigment made of powder containing particles mainly composed of titanium oxide (pigment particles). From the viewpoint of easily increasing the whiteness of the sheet to be produced with a small blending amount, it is more preferable.

  The content of the coloring material in the composite is preferably more than 0% by mass and 50% by mass or less. The content of the colorant in the composite is more than 0 parts by mass and 100 parts by mass or less when expressed in parts by mass (external addition: the amount of colorant added to the resin). The content of the coloring material in the composite is sufficient strength of the sheet to be produced, the viewpoint of obtaining coloring, the viewpoint of suppressing the dropping of the coloring material from the composite, the stability of the shape of the composite (composite) Is preferably 1% by mass or more and 50% by mass or less, and more preferably 2% by mass or more and 30% by mass or less, and 3% by mass or more and 20% by mass or less. It is more preferable.

  In the present specification, the term “coloring material” is used to mean a material for coloring. In the present specification, the term “pigment” includes the meaning of a powder in which a plurality of unit particles (pigment particles) are aggregated. The unit particles (pigment particles) are particles that are difficult to be further reduced by ordinary pulverization means. For example, in the case of a white pigment made of titanium oxide, the unit particles (pigment particles) may be ones in which titanium oxide microcrystals are used as primary particles and a plurality of the primary particles are aggregated. In this case, agglomeration between primary particles may be agglomerated by forming chemical bonds or twins, and mechanical pulverization is often difficult. Further, the structure of one pigment particle may be a primary particle itself or a combination of primary particles.

  The resin is kneaded using, for example, a kneader, Banbury mixer, single-screw extruder, multi-screw extruder, two-roll, three-roll, continuous kneader, continuous two-roll, etc., and then pelletized by an appropriate method. And can be obtained by pulverization. Resins having various sizes may be included. In order to obtain a resin having a desired size, the resin may be classified using a known classifier. The outer shape of the resin particles is not particularly limited, and may be a spherical shape, a disk shape, a fiber shape, an indeterminate shape, or the like. However, it is more preferable that the shape of the resin is as close to a sphere as possible because the resin is easily disposed between the fibers in the mixing unit 80.

  The volume average particle diameter of the resin particles is appropriately set according to a request for increasing the strength (tensile strength, tear strength, etc.) of the sheet to be formed, and pulverization and classification operations are performed in accordance therewith. That is, when the amount of resin blended in the sheet is constant, if the volume average particle diameter of the resin is large, the binding force between the fibers is increased and the strength of the sheet can be increased, but the number of resins is reduced. The dispersion (distribution) of the resin in the sheet surface tends to be rough. On the other hand, when the amount of resin blended in the sheet is constant, if the volume average particle diameter of the resin is small, the binding force between the fibers is weakened and the strength of the sheet is reduced, while the resin is dispersed within the sheet surface. (Distribution) tends to be uniform. As described above, when the amount of the resin blended in the sheet is constant, the strength of the sheet depends on the volume average particle diameter of the resin.

  Such a suitable volume average particle size depends on the blending amount of the resin in the sheet, but when the blending amount is 5% by mass or more and 70% by mass or less, the volume average particle size is preferably 1 μm or more and 100 μm or less. More preferably, it is 3 μm or more and 50 μm or less.

  Moreover, the magnitude | size (volume average particle diameter) of resin can also be adjusted according to the thickness (average diameter) of the fiber which comprises a defibrated material. From the viewpoint of more uniformly mixing the fibers and the resin in the mixing unit 80, the resin volume average particle diameter is larger than the fiber thickness (average diameter). Smaller is preferable. From such a viewpoint, the absolute value of the volume average particle diameter of the resin is not particularly limited, but is 0.1 μm or more and 1000 μm or less as the volume average particle diameter.

1.3.2. Aggregation inhibitor A resin (powder) may contain an aggregation inhibitor. The aggregation inhibitor has a function of making the resins less likely to aggregate with each other when added to the resin than when not added.
Various aggregation inhibitors can be used, but in the sheet manufacturing apparatus 100 of the present embodiment, water is not used or is hardly used, and thus is disposed on the surface of the resin (or coating (coating) or the like). Are preferably used. Considering only the effect of suppressing aggregation, the aggregation inhibitor is effective for both the resin and the resin (composite) integrally having the above-described coloring material.

  Examples of such an aggregation inhibitor include fine particles made of an inorganic substance. By disposing this on the surface of the composite, a very excellent aggregation inhibitory effect can be obtained.

  When the resin is agglomerated, the amount of the resin that exhibits the function of adhering the fibers is relatively decreased. Therefore, when viewed from each fiber, when the number of adhesion points with other fibers is reduced and formed into a sheet shape, the strength of the sheet becomes insufficient. Therefore, in order to increase the strength of the sheet, it is not sufficient to pay attention to the amount of the resin, and the dispersibility of the resin should be emphasized in some cases.

  Aggregation refers to a state in which objects of the same kind or different kinds are physically in contact with each other by electrostatic force or van der Waals force. In addition, when an aggregate (for example, powder) of a plurality of objects is in a non-aggregated state, it does not necessarily mean that all of the objects constituting the aggregate are discretely arranged. That is, the state in which the aggregate is not included includes a state in which a part of the objects constituting the aggregate is aggregated, and the amount of the aggregated object is 10% by mass or less of the aggregate, preferably Even if it is about 5% by mass or less, this state is included in the “non-aggregated state” in the aggregate of a plurality of objects. Furthermore, when the powder is packaged, etc., the particles of the powder are in contact with each other, but an external force that does not break the particles is applied, such as gentle agitation, dispersion by airflow, free fall, etc. Thus, if the particles can be in a discrete state, they are included in the non-aggregated state.

  Specific examples of the material for the aggregation inhibitor include silica, titanium oxide, aluminum oxide, zinc oxide, cerium oxide, magnesium oxide, zirconium oxide, strontium titanate, barium titanate, and calcium carbonate. A part of the material of the aggregation inhibitor is the same as the material of the colorant described above, but is different in that the particle diameter of the aggregation inhibitor is smaller than the particle diameter of the colorant. For this reason, the aggregation inhibitor does not greatly affect the color tone of the sheet to be produced, and therefore can be distinguished from the above-described coloring material in the present specification. However, when adjusting the color tone of the sheet, even if the particle size of the aggregation inhibitor is small, an effect such as slight light scattering may occur, so it is more preferable to consider such an effect.

  The average particle size (number average particle size) of the aggregation inhibitor particles is not particularly limited, but is preferably 0.001 to 1 μm, and more preferably 0.008 to 0.6 μm. Aggregation inhibitor particles are close to the category of so-called nanoparticles and have a small particle diameter, so they are generally primary particles. However, a plurality of primary particles are combined to form higher-order particles. It may be. If the particle diameter of the primary particles of the aggregation inhibitor is within the above range, the surface of the resin can be satisfactorily coated, and a sufficient aggregation suppression effect can be imparted. When an aggregation inhibitor is disposed on the surface of the resin, the aggregation inhibitor is present between the resin particles and the resin particles, and the effect of suppressing aggregation is enhanced. In addition, even if the resin and the aggregation inhibitor are separated, the effect is less than in the case of integrating them, but a certain aggregation suppression effect can be obtained.

  When the aggregation inhibitor is added to the resin in an amount of 0.1 parts by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the resin, the above effect can be obtained, the effect is enhanced, and From the standpoint of suppressing the aggregation inhibitor from falling off from the sheet to be produced, etc., preferably from 0.2 parts by mass to 4 parts by mass, more preferably 0.5 parts by mass with respect to 100 parts by mass of resin. Part to 3 parts by mass.

  The method for arranging (coating) the aggregation inhibitor on the surface of the resin is not particularly limited, and the aggregation inhibitor may be blended together with the resin when the resin is formed by melt kneading or the like. However, in this case, since most of the aggregation inhibitor is disposed inside the resin particles, the aggregation suppression effect with respect to the addition amount of the aggregation inhibitor is reduced. It is more preferable that the aggregation inhibitor is disposed on the surface of the resin particles as much as possible in view of the aggregation suppression mechanism. Examples of the mode of disposing the aggregation inhibitor on the surface of the resin include coating and covering, but the entire surface of the resin may not necessarily be covered. Further, the coverage may exceed 100%, but if it is about 300% or more, the function of binding the fibers of the resin may be impaired. select.

  Various methods are conceivable as a method for disposing the aggregation inhibitor on the surface of the resin, but it is possible to produce an effect by simply mixing the two and adhering them to the surface by electrostatic force or van der Waals force. Concerns remain. Therefore, a method in which the resin and the aggregation inhibitor are put into a mixer that rotates at high speed and uniformly mixed is preferable. As such an apparatus, a known apparatus can be used, and an FM mixer, a Henschel mixer, a super mixer, or the like can be used. By such a method, the aggregation inhibitor particles can be arranged on the surface of the resin particles. The aggregation inhibitor particles arranged by such a method may be arranged in such a state that at least a part of the aggregation inhibitor bites into the surface of the resin or is indented, and the aggregation inhibitor is difficult to fall off from the resin particles. And can stably exhibit an aggregation suppressing effect. Further, when such a method is used, the above arrangement can be easily realized in a system containing little or no moisture. Moreover, even if there are particles that do not penetrate into the resin, such an effect can be sufficiently obtained. It should be noted that the state in which the aggregation inhibitor particles bite into the surface of the resin or the state in which the particles have been sunk can be confirmed by various electron microscopes.

  If the ratio (area ratio) covered by the aggregation inhibitor on the resin surface is 20% or more and 100% or less, a sufficient aggregation inhibition effect can be obtained. Such an area ratio can be adjusted by charging into an apparatus such as an FM mixer. Furthermore, if the specific surface area of the aggregation inhibitor and the resin powder is known, it can be adjusted by the mass (weight) of each component at the time of preparation. The area ratio can also be measured with various electron microscopes. In addition, when the aggregation inhibitor is disposed in such a manner that it does not easily fall off from the resin, it can be said that the aggregation inhibitor is integrally provided in the resin.

  When an aggregation inhibitor is blended in the resin, the aggregation of the resin can be made extremely difficult to occur, so that the composite and the fiber material can be more easily mixed in the mixing unit 80. That is, when an aggregation inhibitor is blended in the composite, the composite quickly diffuses into the space, and a very uniform mixed material can be formed.

  The resin may contain other components. Examples of other components include organic solvents, surfactants, antifungal agents / preservatives, antioxidants / ultraviolet absorbers, oxygen absorbers, and the like.

  In the mixing unit 80, the above-described fibers (fiber materials) and the resin are mixed, and the mixing ratio thereof can be appropriately adjusted depending on the strength, application, and the like of the sheet to be manufactured. If the manufactured sheet is for office use such as copy paper, the ratio of the resin to the sheet is 5% by mass or more and 70% by mass or less, the viewpoint of obtaining good mixing in the mixing unit 80, and the mixture into a sheet shape From the viewpoint of making it less susceptible to the influence of gravity when molded, the content is preferably 5% by mass or more and 60% by mass or less.

1.4. Coverage The sheet manufactured by the sheet manufacturing apparatus 100 of this embodiment has a resin coverage of 2
It is 5% or more and 86% or less. The coverage of the sheet manufactured by the sheet manufacturing apparatus 100 is defined as follows.

  First, the surface of the sheet manufactured by the sheet manufacturing apparatus 100 is observed with an optical microscope to obtain a color image. The reason why the color image is taken is to avoid the change of the whiteness of the image due to the influence of the observation light quantity. In monochrome imaging, the black part may appear white due to the influence of the amount of observation, and vice versa, and the white part may appear black. Difficult to observe in the same state. However, if color imaging is performed as in this method, the color difference can be recognized in a normal observation state, and the boundary position can always be correctly recognized.

  The captured image is classified into a fiber color (for example, white portion) and a color other than the fiber (for example, color portion) by image processing, and the area ratio is calculated. FIG. 2 is an image diagram obtained by enlarging and processing a sheet and a part of the sheet. A portion where the fiber is exposed is a white portion, and a portion of the fiber that is covered is a portion other than the white portion. It is possible to determine whether each pixel is a white portion or a color portion by decomposing the captured image in units of pixels and converting it into RGB data. In FIG. 2, reference numeral S is assigned to the sheet, reference numeral F is assigned to the fiber, and reference numeral R is assigned to the resin. By dividing the total count of the number of pixels in the white part by the total number of pixels, the area ratio of the white part can be calculated.

  As used herein, “coverage” is defined as the proportion of the unexposed portion of the fiber. Therefore, the white part area ratio (%) by the above calculation can be subtracted from 100%, and the obtained numerical value can be obtained as the resin coverage. Conversely, the exposure rate is the white area ratio (%) and is defined as 100% minus the coverage rate (%).

  When determining the coverage, in order to clearly distinguish the fiber part from the resin part, add a pigment of a color other than the fiber color (cyan, magenta, etc.) It may be easier to distinguish. The color of the fiber may be other than white.

1.5. Relationship between resin content and coverage The resin content is not directly related to the resin coverage in the sheet. This is because the resin coverage in the sheet varies greatly depending on conditions such as the density of the sheet to be produced and the temperature at the time of production. Moreover, even if the coverage is the same, if the thickness increases due to the aggregation of the resin, the resin content will be different. However, qualitatively, as the resin content increases, the resin coverage in the sheet tends to increase.

  On the other hand, the coverage is preferably 25% or more, and more preferably 33% or more, in order to make the mechanical strength and texture of the manufactured sheet comparable to paper. In order to produce a sheet having such a coverage in a wide range of conditions during production, the resin content is 8% by mass or more, preferably 10% by mass or more, particularly preferably based on the sheet. It is 12% by mass or more.

  Furthermore, when the sheet manufactured by the sheet manufacturing apparatus 100 of the present embodiment is used as a raw material, if the content of the resin in the sheet is large, the defibrating process by the defibrating unit 20 is insufficient, and a good disintegration is achieved. In some cases, fines cannot be obtained or the amount of defibrated material becomes extremely small. Therefore, when a sheet is produced using the produced sheet as a raw material, the resin content (ratio of the resin to the sheet) in the raw material sheet is 60% by mass or less, preferably 50% by mass or less, more preferably It is 45 mass% or less, More preferably, it is 35 mass% or less, Most preferably, it is 25 mass% or less.

1.6. Operational effect In the sheet manufacturing apparatus 100 of the present embodiment, since the coverage of the sheet to be manufactured is 25% or more, the binding between the fibers on the surface is sufficient. Therefore, a sheet having a sufficiently high strength can be easily manufactured. Moreover, since the coverage of the sheet to be manufactured is 86% or less, the sheet manufacturing apparatus 100 can suppress the amount of resin to be blended, and therefore, when such a sheet is used as a raw material, the sheet is defibrated. In this case, it is easy to separate the fiber and the resin. Thereby, it is suppressed that the quantity of resin becomes excessive, and a favorable sheet | seat can be manufactured even when it uses such a sheet | seat as a raw material.

2. Experimental Examples The experimental examples are shown below to further explain the present invention, but the present invention is not limited to the following examples.

  For the fiber, a commercially available paper (PPC paper: manufactured by Toppan Forms Co., Ltd., trade name “G70”) is introduced as a defibrated material into a dry defibrating machine (made by Freund Turbo, Inc., trade name “Turbo Mill”). The defibrated material discharged from the dry defibrating machine was used. The average diameter of this fiber was 19 μm. The defibrated material and a resin having a resin amount (% by mass with respect to the whole) shown in Table 1 are put into a blender (made by Waring, trade name “Warling Blender 7012”) and rotated at 3100 rpm for 7 seconds. Mixing was performed to obtain a mixed material in which resin and fiber were mixed. The obtained mixed material was put into a gold sieve having a diameter of 0.6 mm and a diameter of 200 mm, and a fluororesin-coated aluminum disc having a diameter of 180 mm (plate thickness: 1 mm) (trade name “Sumiflon” manufactured by Sumitomo Electric Fine Polymer Co., Ltd.). The mixed material was deposited on the coated aluminum “) using an electric sieve shaker (trade name“ AS200 ”manufactured by Lecce Co., Ltd.). Since the deposited mixed material was in a bulky cotton-like form, a fluorine-coated aluminum plate having the same diameter was placed thereon and pressed and compressed. The molded mixed material was sandwiched between aluminum discs, set in a heating press and held for 60 seconds, then released from the press and allowed to stand at room temperature. Then, the sheet | seat of each experimental example shown in Table 1 was obtained by peeling the thermoformed mixed material from an aluminum plate.

  In each experimental example, the resin coverage was determined using a resin containing a polyester resin (trade name “Byron 220” manufactured by Toyobo Co., Ltd., glass transition point: 54 ° C., softening temperature: 96 ° C.). The resin coverage was determined by the method described in “1.4. Coverage”, and the average resin coverage was also shown in Table 1.

  In addition, the influence of the presence or absence of the aggregation inhibitor was also examined. The coating of the anti-aggregation agent on the resin is performed by blending 100 parts by weight of the uncoated resin and 1 part by weight of ultrafine titanium dioxide (trade name “SST-30EHJ” manufactured by Fuji Titanium Industry Co., Ltd.) as an aggregation inhibitor. (Trade name “Warling Blender 7012” manufactured by Waring Co., Ltd.) and mixing for 60 seconds at a rotation speed of 15600 rpm. When the treated resin (having the resin and the coagulation inhibitor integrally) is placed in a glass container and allowed to stand for 24 hours, it is not recognized that the resin after the coagulation aggregates into a block (blocking), and the fluidity The state of a certain granular material was maintained. From this, it was confirmed that the coating was applied and the state where it did not aggregate was maintained. The presence / absence of an aggregation inhibitor in each experimental example is shown in Table 1.

  The strength of the sheet obtained by the above method was tested for tensile properties in accordance with JIS P8113, and the difference from general recycled paper (PPC paper) was examined. As a result, when it is determined that there is no difference in strength compared to general recycled paper, ○, when it is determined that the strength is slightly inferior compared to general recycled paper, △, compared to general recycled paper The case where it was determined that the strength is very inferior is shown in Table 1 as x.

  Further, the sheet obtained in each experimental example has a dry defibrating machine (rotating part (rotor) and a fixing part covering it) as a material to be defibrated, and a gap between the rotating part and the fixing part. (Gap formed), and defibrating treatment was performed under the same conditions (gap thickness, rotation speed). The fibers of each experimental example discharged from the dry defibrator were randomly observed with an optical microscope, and the number of fibers in a state in which a plurality of fibers were bound without being unraveled one by one was 10 The results are shown in Table 1, with ○ being less than this, Δ being 11 or more and 20 or less, and × being 21 or more.

  Furthermore, as a determination result, those having no “x” in any of the evaluation result of the sheet strength and the evaluation result of the defibrating treatment are shown in Table 1 as “◯”.

From Table 1, it was found that when the coverage with the resin was 25% or more and 86% or less, the determination result was “◯”, and a good sheet was obtained. More preferably, when the coverage with the resin is 33% or more and 45% or less, both the sheet strength and the evaluation result of the defibrating treatment are “◯”. This is because if the resin coverage is low, the resin-resin binding is insufficient and the sheet strength is insufficient, and if the resin coverage is high, the resin-resin binding is unraveled when defibrated. Because there is no. That is, a sheet having a determination result of “◯” in Table 1 is a sheet having high strength and good recyclability. Furthermore, it has been found that the coverage is increased by blending an aggregation inhibitor at the same resin content (8 mass% and 60 mass%). It is considered that the coverage can be increased as a result of the resin being more uniformly dispersed in the sheet by the aggregation inhibitor. Thereby, when the resin content is 8% by mass, the coverage is increased by including the aggregation inhibitor, and the sheet strength is also improved from “×” to “Δ”. On the other hand, when the content of the resin is 60% by mass, including an aggregation inhibitor increases the coverage and makes it difficult to defibrate.

3. Other Matters In this specification, the term “homogeneous” means that, in the case of uniform dispersion or mixing, in an object that can define two or more components or two or more components, one component is relative to another component. This means that the existing positions are uniform throughout the system, or the same or substantially equal to each other in each part of the system. In the present specification, terms such as “uniform”, “same”, “equally spaced”, etc. mean that the density, distance, dimensions, etc. are equal. Although it is desirable that these are equal, it is difficult to make them completely equal. Therefore, it is assumed that the values do not become equal due to accumulation of errors and variations.

  The present invention is not limited to the above-described embodiments, and various modifications can be made. For example, the present invention includes configurations that are substantially the same as the configurations described in the embodiments (configurations that have the same functions, methods, and results, or configurations that have the same objects and effects). In addition, the invention includes a configuration in which a non-essential part of the configuration described in the embodiment is replaced. In addition, the present invention includes a configuration that exhibits the same operational effects as the configuration described in the embodiment or a configuration that can achieve the same object. In addition, the invention includes a configuration in which a known technique is added to the configuration described in the embodiment.

DESCRIPTION OF SYMBOLS 10 ... Crushing part, 11 ... Crushing blade, 15, 16 ... Hopper, 20 ... Defibration part, 21 ... Introduction port, 22 ... Discharge port, 30 ... Classification part, 31 ... Introduction port, 34 ... Lower discharge port, 35 ... upper discharge port, 40 ... sorting unit, 46 ... introduction port, 47 ... discharge port, 50 ... binding unit, 56 ... heater roller, 60 ... dispersion unit, 66 ... introduction port, 70 ... sheet forming unit, 72 ... Deposition unit, 74 ... tension roller, 77 ... tension roller, 80 ... mixing unit, 81-86 ... pipe, 87 ... resin supply unit, 88 ... supply port, 90 ... winding unit, 92 ... winding roller, 100 ... Sheet manufacturing equipment

Claims (4)

It has a defibrating part for defibrating the material to be defibrated,
A sheet manufacturing apparatus that manufactures a sheet by binding defibrated fibers and fibers via a resin,
The sheet manufacturing apparatus, wherein the resin has a coverage of 25% or more and 86% or less in the sheet.   The sheet manufacturing apparatus according to claim 1, wherein the resin is contained in an amount of 8% by mass to 60% by mass with respect to the sheet.   The sheet manufacturing apparatus according to claim 1, wherein the sheet contains an aggregation inhibitor when the content of the resin with respect to the sheet is 10% by mass or less.   The sheet | seat with which the coverage of the said resin in the sheet | seat which bound the fiber and the fiber through resin is 25% or more and 86% or less.