JP2004017434A - Titanium oxide-containing woody synthetic material composition and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive titanium oxide-containing woody synthetic material composition having high air cleaning effect and a manufacturing method therefor. <P>SOLUTION: The surface of a woody synthetic composition 29 comprising a mixture of wood flour and a thermoplastic resin is coated with coating (colorant) prepared by adding a pigment and a titanium oxide powder to toluene or the like by a roll or spraying. After coating, the surface of the woody synthetic composition 29 is ground by sanding paper (frequency 40-180) or the like to expose titanium oxide contained in the coating to the surface of the woody synthetic composition 29. Since uneven parts or a large number of flaw streaks are applied to the surface of the woody synthetic composition 29, the sanding of the surface of the woody synthetic composition 29 becomes easy. By exposing titanium oxide to the surface of the woody synthetic composition 29 as mentioned above, an cleaning effect possessed by titanium oxide is sufficiently developed. Further, since the amount to be used of titanium oxide may be little, the titanium oxide-containing woody synthetic material composition can be manufactured inexpensively. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a woody synthetic material composition produced from a mixture of a cellulosic crushed material such as wood flour and a thermoplastic resin and a method for producing the woody synthetic material composition, and more particularly, to a titanium oxide having an air cleaning effect. The present invention relates to a method for producing a wood-based composite material containing titanium oxide and a wood-based synthetic material composition containing titanium oxide.
[0002]
[Prior art]
Conventionally, furniture (tables, chairs, wardrobes, office desks, TV stands, etc.), interior products (outdoor furniture, deck materials, fences), partition boards, floors, roofs, bathrooms, toilets, exterior materials, interior materials, temporary houses, BACKGROUND ART Wooden boards (such as plywood such as natural wood or plywood) are widely used for various uses such as storages, entrance doors, interior doors, counters, flower boxes, lattices, and kennels. However, when a wooden plate material is commercialized in this way, a connecting metal fitting or the like is required, so that the appearance may be deteriorated. In addition, it has a problem in durability, such as being weak to water and easily corroded, and therefore is often unfavorable especially when it is used outdoors, for example, directly exposed to wind and rain. From such a point, recently, as a substitute for the wooden board which is a raw material of the above-mentioned products, a board made of a woody synthetic material composition using a mixture of wood flour and a synthetic resin (for example, a thermoplastic resin) as a raw material has become widespread. Have been.
[0003]
The woody synthetic material composition serving as a raw material of the above product is obtained by heating and kneading wood flour and a thermoplastic resin and molding the mixture into a predetermined shape. Although the ratio varies depending on the mixing ratio and the like, the specific gravity of the woody synthetic material composition is 0.97 to 1.48, and the specific gravity of a general wood board (for example, a plywood such as a veneer board is 0.45 to 0.75). ) Is larger and heavier than that of), so that a hollow portion may be formed inside to reduce the weight. In addition, in order to manufacture colorful products and to diversify applications, when molding or processing these woody synthetic material compositions into products, coloring agents, fillers (reinforcing) are used according to the applications. ), A stabilizer, a plasticizer, a foaming agent, a flame retardant, and the like, thereby exhibiting various excellent performances. The type of colorant and the like also differs depending on the type of synthetic resin used as a raw material, and is often used to increase the added value of a product.
[0004]
On the other hand, at present, due to the deterioration of our living environment, indoor workers, for example, office workers, etc., are equipped with air conditioning equipment with an air purifying function, and consideration is given to the air environment. .
[0005]
[Problems to be solved by the invention]
However, with respect to current synthetic resin products (for example, products made of the above-mentioned woody synthetic material composition), at present, synthetic resins and the like do not have an air cleaning function. Since sufficient effects cannot be expected unless titanium oxide or the like is exposed on the surface, it is necessary to efficiently concentrate a small amount of titanium oxide or the like on the surface of the product. Further, even when a paint or the like containing titanium oxide or the like is applied to the surface of the product, the titanium oxide or the like may not be exposed on the surface in some cases. If the surface is cut, the appearance may be impaired and the product may not be finished.
[0006]
Accordingly, an object of the present invention is to provide a titanium-containing wood synthetic material composition having an air purifying function and a method for producing the titanium oxide-containing wood synthetic material composition, in order to solve the above-mentioned problems.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 comprises molding a woody synthetic material composition from woody synthetic powder obtained by mixing 40 to 60% by weight of a cellulosic crushed product and 60 to 40% by weight of a thermoplastic resin. Applying a titanium oxide-containing paint to the surface of the wood composite material composition, and after applying the composition, polishing the paint to expose the titanium oxide to the surface; It is a method of manufacturing a product.
[0008]
The invention according to claim 2 is the method for producing a woody synthetic material composition according to claim 1, wherein the paint is a mixture of the titanium oxide in a toluene solvent.
[0009]
The invention according to claim 3 is the method for producing a woody synthetic material composition according to claim 1 or 2, wherein the paint is a mixture of a pigment.
[0010]
The invention according to claim 4 is characterized in that after applying the paint, a colorant mixed with the pigment is applied, and after the application, the paint and the colorant are polished to expose the titanium oxide on the surface. The method for producing a titanium oxide-containing woody synthetic material composition according to any one of claims 1 to 3.
[0011]
According to a fifth aspect of the present invention, a woody synthetic material composition is formed from a woody synthetic powder obtained by mixing 40 to 60% by weight of a cellulosic crushed product and 60 to 40% by weight of a thermoplastic resin. Applying titanium oxide containing titanium oxide to the surface, heating the surface of the woody synthetic material composition after the application, eluting the gelatin, and exposing the titanium oxide to the surface. This is a method for producing a wood-containing synthetic material composition.
[0012]
The invention according to claim 6 is characterized in that irregularities or scratches are formed on the surface of the woody synthetic material composition, and the method for producing a titanium oxide-containing woody synthetic material composition according to any one of claims 1 to 5. It is.
[0013]
The invention according to claim 7 is the method for producing a titanium oxide-containing wood synthetic material composition according to any one of claims 1 to 6, wherein the wood synthetic material composition is a plate having a hollow structure.
[0014]
The invention according to claim 8 is a titanium oxide-containing wood synthetic material composition produced by the method for producing a titanium oxide-containing wood synthetic material composition according to any one of claims 1 to 7.
[0015]
As the cellulosic crushed material here, wood flour and the like are preferable. Wood powder and the like have a water content of 3% by weight or less, preferably 0.3% by weight or less. The average particle size is 50 to 300 mesh, preferably 60 (below the sieve) to 150 (above the sieve) mesh. The type of wood flour does not matter. A reinforcing agent (such as a safranin solution) may be mixed at about several percent or less (for example, 0.5%). The thermoplastic resin is preferably a general-purpose plastic (polyolefin, polystyrene resin, methacrylic resin, polyvinyl chloride, etc.), engineering plastic (polyamide, polycarbonate, saturated polyester, polyacetal, etc.). For example, it is preferably made of a thermoplastic elastomer such as polyethylene (PE), polypropylene (PP), vinyl chloride resin (PVC), or nylon.
[0016]
Titanium oxide has semiconductor properties, and is widely used as a diode for rectification, photosensitive elements, and the like, and as a transistor for amplification, oscillation, and the like. At present, it is also used as an indispensable catalyst for the production of optical fiber materials and high-quality PET bottles. The titanium oxide used here is preferably in the form of a powder.
[0017]
The paint may or may not be mixed with a pigment. When the pigment is not mixed, it is preferable to further apply a coloring agent containing a pigment after applying the coating material containing titanium oxide. The coating may be performed on both sides or one side. Polishing is preferably performed by polishing a substance other than titanium oxide such as paint with sanding paper or the like to expose the titanium oxide on the surface. Heating may be any treatment as long as the gelatin can be eluted and the contained titanium oxide can be exposed on the surface. For example, it is preferable to wash the surface with hot water or the like.
[0018]
Examples of the shape of the woody synthetic material composition include plate materials and column materials. Further, those having a hollow structure are preferable. Extrusion molding is preferred for molding the woody synthetic material composition. It is preferable to provide a fluororesin sheet in the mold of the extrusion molding device used at this time, to provide irregularities on the surface of the fluororesin sheet, and to form an uneven surface on the surface of the woody synthetic material composition. . By forming the irregularities on the surface, it becomes easy to apply a paint or a coloring agent, and also easy to grind with sanding paper or the like. Further, it is preferable to form a large number of scratches by grinding and polishing after molding.
[0019]
In addition, an extrusion molding apparatus applied to the production of a woody synthetic material composition (for example, a plate having a hollow structure) heats and kneads the raw materials, and extrudes the extruded material from the extruder into an extruder that extrudes with a screw. A molding chamber comprising a melting section for heating the dough and a slow cooling section for cooling the extruded dough extruded from the melting section, and extending from the melting section in parallel with the extrusion direction of the extruded dough to extend at least to the slow cooling section. An extrusion molding apparatus comprising: a molding die having a core body connected thereto; and a take-out means for taking up a woody synthetic material composition extruded from the molding die. It is preferable that at least a part of the child body is covered with a container of a fluororesin sheet (preferably an aramid fiber fluororesin sheet). The present invention can be carried out without the above-mentioned take-off means.
[0020]
The core has a cross-sectional shape substantially the same as the cross-sectional shape of each hollow portion formed in the molded woody synthetic material composition, and a plurality of rod-like members arranged substantially in parallel with the extrusion direction as a length direction. In the case of a member and a connecting portion that is continuous with each of the rod-shaped members and that joins the ends of the rod-shaped member at the fusion zone, at least the connecting portion is made of aramid fiber woven cloth. It is preferable to cover with a container of the fluororesin sheet obtained by impregnating a resin dispersion, drying and firing.
[0021]
The covering with the container may be performed by inserting the joint portion of the core into a bag-shaped container made of the fluororesin sheet. Further, as another method, a cut in an orthogonal direction to one side is overlapped with two fluororesin sheets provided in correspondence with a position of a gap formed between the rod-shaped members. By joining two parallel sides and both sides of the cut, one end opening forms a tubular body that is branched into a plurality of pieces corresponding to the number of the bar-shaped members formed, and It can also be performed by inserting at least the end of the portion and the rod-shaped member near the coupling portion into the housing of the cylindrical body. Further, the bag-like body and the cylindrical body may be joined to form a single body as a container. The present invention can be practiced with the rod-shaped member separated without the connecting portion.
[0022]
Further, it is preferable that the above-mentioned fluororesin sheet similar to the material for covering the core body is also attached to the inner wall surface of the forming die of the extrusion molding apparatus.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0024]
In the present embodiment, as an example, a kneaded product obtained by heating and kneading a cellulosic crushed product and a thermoplastic resin is cooled, solidified, and pulverized to a predetermined particle size (this specification). In the following description, the production of a woody synthetic material composition using “woody synthetic powder” as a raw material will be described.
[0025]
(Woody synthetic material composition)
Wood flour, which is a cellulosic crushed material that is a raw material of the woody synthetic powder used in the present embodiment, improves compatibility with the thermoplastic resin molding material, reduces frictional resistance at the time of molding extrusion, and reduces wear and damage of the molding machine. In order to prevent this, a fine powder having a particle size of 50 to 300 mesh, preferably 60 (below the sieve) to 150 (above the sieve) mesh is used. In order to volatilize wood acid gas at the time of molding, eliminate the possibility of generation of water vapor or bubbles, and prevent surface roughening, the moisture content of the wood flour before drying is within 15% by weight, preferably 11% by weight. %, Ideally within 5% by weight, particularly preferably within 0.3% by weight.
[0026]
In order to further improve the characteristics of the wood flour, it is possible to immerse or add a material such as a wood chip to a urea-based resin adhesive, and to heat and harden the material, followed by crushing and pulverization. Depending on the purpose of use, pigments may be added to the wood flour and colored in advance.
[0027]
In addition, as a thermoplastic resin molding material, discarded various resin molded products as they are or a resin molded product on which a surface resin coating film is formed is crushed into a plurality of small pieces, and a compression grinding action or the like is added thereto. A resin such as PVC, PET, or PP, which is made into a material by grinding and peeling a resin coating film, can be used.
[0028]
Then, after drying the wood flour, the thermoplastic resin molding material 60 to 40% is contained with respect to 40 to 60% by weight of a cellulosic crushed product having a water content of 3% by weight, preferably 0.3% by weight or less and an average particle diameter of 200 mesh or less. By mixing and gelling and kneading both by weight with a stirring impact blade, cooling the gelled kneaded material, and further using a woody synthetic powder obtained by sizing to a particle size of 200 mesh or less, the friction of the wood powder is increased. A good kneaded dough is formed which can reduce the resistance.
[0029]
An example of a method for producing a woody synthetic powder and a woody synthetic material composition used in the present embodiment will be described with reference to FIG.
[0030]
(1) Drying process This is a drying method in which water is beaten from wood flour by using shear heat generated by the impact of rotation without using a heat source (boiler heat, electric heat, heater heat, etc.). The time required for water removal is about 15 minutes. As an example, using a mixer, wood flour, which is a cellulosic crushed product, is dried. The temperature inside the mixer rises due to the generation of shear heat by rotating the stirring impeller of the mixer, whereby the wood flour put into the mixer is dried. In the present embodiment, the wood flour is dried so that the water content of the wood flour becomes 0.3% by weight or less. The particle size of the wood flour is preferably 50 to 200 mesh. The moisture is preferably dried to 0 to 0.3% by weight. The method is to rotate the mixer to remove water.
[0031]
When titanium oxide or the like is added as a pigment or the like, it is put into a mixer together with the wood powder in the drying step. The type of pigment may be inorganic or organic. The weight ratio of the pigment differs depending on the type of the pigment. For example, about 10% by weight of white titanium oxide is added to 100% by weight of wood flour. Since only the wood powder is colored and the thermoplastic resin is not colored, discoloration of the wood powder can be prevented. Wood powder can prevent ultraviolet rays and reduce deterioration.
[0032]
(2) Melting / Kneading Step Wood powder and a thermoplastic resin are mixed, melted and integrated. Wood powder and plastic are melted by the heat generated by the high-speed rotor, and integrated at the molecular level. The weight ratio is 40 to 60% by weight of a mixture of pigment and wood flour and 60 to 40% by weight of a non-colored thermoplastic resin. The thermoplastic resin is melt-mixed to form granular pellets. The rotation speed of the melter mixer is 850 to 900 rpm, and the temperature is 180 to 190 ° C.
[0033]
For example, with respect to 55% by weight of the dried wood flour, 45% by weight of PP as a thermoplastic resin molding material is charged into the mixer, and the mixture is further stirred and pressed. As the form of the thermoplastic resin molding material, in the present embodiment, pellets having a size of about 3 mm in diameter are used.
[0034]
The thermoplastic resin molding material uses, for example, 50% by weight of the recovered thermoplastic resin obtained from the waste material of the thermoplastic synthetic resin product, the virgin thermoplastic resin, or the virgin thermoplastic resin and the recovered thermoplastic resin, respectively. You can also.
[0035]
In this step, the thermoplastic resin such as PP does not form a large lump due to the wood powder in the raw material, and a "kneading material" gelled into a clay-like material having a diameter of about 10 to 100 mm is formed.
[0036]
(3) Cooling / granulation (granulation) step In this step, for example, a so-called cooling mixer that can simultaneously cool and granulate the above-described kneaded material is used. The kneaded material formed in the previous step is introduced into a cooling mixer, cooled on the inner peripheral wall surface of the mixer body cooled by cooling water, and a "granulated raw material" granulated to a diameter of about 25 mm or less is formed.
[0037]
The granulated raw material formed in the above step is further sized to a particle size of 8 mm or less using a cutter mill, if necessary, to obtain pellet-like “woody synthetic powder”. The sizing step is not always necessary, and may be omitted depending on the size of the granulated product obtained in the cooling / granulating step.
[0038]
A woody synthetic powder that constantly maintains the mixed and dispersed state of wood powder and thermoplastic resin molding material and has good fluidity, combined with condensation and shrinkage by cooling, and does not rely on chemical reaction or adhesion. Is formed.
[0039]
(4) Molding process The woody synthetic powder (granular pellets) is put into the extrusion molding device 1, the mixture of the wood powder at a high concentration is melted to a high viscosity state, and the mixture is extruded at a high pressure by the extrusion molding device 1. The woody synthetic material composition 29 is extruded while being pressed into a mold and compacted under high pressure (see FIGS. 2 to 6). Due to its high viscosity, it is extruded with forward pressure applied. The higher the viscosity is, the faster the flow is, applying the principle of thixotropy. Details of the extrusion molding device 1 will be described later. A fluororesin sheet 50 'is provided in a mold, irregularities are formed on the surface of the fluororesin sheet 50', the fluororesin sheet 50 'is stuck in the mold, and a high pressure is applied to the woody synthetic material composition 29. The surface of the thermoplastic resin is made uneven (grooves) or the like, and a hollow product is made. The fluororesin sheet 50 'is a sheet in which a woven fabric of aramid fibers is impregnated with a fluororesin dispersion, dried and fired. Therefore, on the surface of the sheet, the weave of the aramid fiber appears in a predetermined shape such as a lattice shape (see FIGS. 7A and 7B). Further, after molding the woody synthetic material composition 29, the surface can be ground with a coarse sanding paper (frequency 40 to 60) or the like to form many scratches.
[0040]
(5) Coating Step A coating (colorant) containing a pigment and titanium oxide powder in toluene, lacquer, or the like is applied to the surface of the wooden synthetic material composition 29 formed as described above using a roll or a spray. In addition, as a coating method, a spray method is used for a three-dimensional method, an electrostatic coating method is used for a part of the method, and a curtain flow coater, a roller coater, a bottom coater, or the like is used for a three-dimensional method. Next, the woody synthetic material composition after application of the paint is naturally dried. At this time, the paint penetrates the wood flour, so that the adhesion of the paint is improved. The paint only needs to contain titanium oxide powder in toluene, lacquer, or the like, and it is not necessary to mix a pigment when the woody synthetic material composition is not colored. After the application of the paint (regardless of whether or not the pigment is mixed), a paint (colorant) in which the pigment is further mixed may be applied.
[0041]
(6) Sanding Step After the above application, the surface of the woody synthetic material composition 29 is polished with sanding paper (frequency: 40 to 180) or the like to expose the titanium oxide contained in the paint to the surface. At this time, it is preferable that the entire surface is cut down to the groove. Since the surface of the wooden synthetic material composition 29 is uneven or has many small scratches, sanding of the surface is facilitated. By exposing the titanium oxide to the surface as described above, the air cleaning effect of the titanium oxide is sufficiently exhibited.
[0042]
In addition, by sanding, a color can be brought out to the surface, and a unique wooden texture and natural feeling can be given. The wood grain pattern is formed by the synergistic effect that the colorant penetrates the wood flour and causes bleeding, and that the colored wood flour on the uneven surface has different cutting positions so that the density of each colored wood flour differs. As a result, a unique color tone is produced, and a light and shaded pattern close to the grain of natural wood is produced.
[0043]
(7) Finishing Step Lastly, a transparent paint such as clear lacquer or mat is applied to the surface of the woody synthetic material composition 29 and dried to finish. This finish includes amino alkyd, lacquer, polyester, polyurethane and the like. Thereby, a feeling of wood quality improves.
[0044]
As another embodiment, in the application step (5), gelatin containing titanium oxide can be applied. In this case, it is preferable that, instead of the sanding step (6), hot water or the like is applied to the surface of the woody synthetic material composition 29 to elute the gelatin and expose the titanium oxide to the surface. Further, the surface may be sanded after the gelatin is eluted. According to this method, it is possible to suitably apply titanium oxide not only to the woody synthetic material composition 29 but also to fibers of clothes and the like.
[0045]
(Extrusion molding equipment)
As shown in FIGS. 2 to 6, the extrusion molding apparatus 1 of the present invention for molding the woody synthetic powder into the woody synthetic material composition 29 includes an extruder 70 and an extruded dough 79 discharged by the extruder 70. It has a forming die 10 for forming into a shape, and a take-off means 30 for picking up a woody synthetic material composition 29 extruded from a die outlet 23 of the forming die 10. The forming die 10 is a connection comprising an extrusion die 19 and a flange 17. It is connected to the extruder 70 by means.
[0046]
(1) Extruder In FIG. 2, reference numeral 70 denotes an extruder that constitutes the extrusion molding apparatus 1 described above. Generally, the extruder 70 is of a screw type, and includes a single-screw extruder and a multi-screw extruder. Some extruders have a modified form or a combination thereof. In the present invention, any extruder may be used. Can be.
[0047]
Reference numeral 71 denotes a screw, which is a single-shaft type in the embodiment shown in FIG. 2, and is driven by a motor (not shown) via a gear reducer 72 and rotates in a barrel 74. The woody synthetic powder supplied from the hopper 73 is extruded forward while being kneaded by the rotation of the screw 71.
[0048]
A band heater 75 is provided on the outer surface of the barrel 74, and the synthetic wood powder is heated by the band heater 75 in the barrel 74, and is gradually melted and kneaded while being conveyed forward along the groove of the screw 71.
[0049]
(2) Connecting means The woody synthetic powder melted and kneaded by the extruder 70 is extruded into the forming die 10 through the connecting means including the extrusion die 19 and the flange 17 as the extruded material 79.
[0050]
2 and 3, an extrusion die 19 is connected to the tip of the barrel 74. In the present embodiment, the extrusion die 19 forms a circular shape having a diameter of 65 mm on the rear end face of the outlet side of the barrel 74. The inflow port 13 is provided with an injection port 15 having a substantially elliptical shape with a width of 65 mm and a height of 25 mm on the tip end surface on the forming die side. A communication hole that is deformed in cross section to a small diameter is formed. However, the extrusion die 19 can be formed in various sizes according to the size of the extruder 70.
[0051]
A flange 17 is attached to the tip of the extrusion die 19. In the present embodiment, the flange 17 has an inflow port 16 having the same shape as the injection port 15 of the extrusion die 19 and an injection port 18 having a width of 97.5 mm and a height of 46.7 mm. Is formed with a communication hole whose cross section gradually changes to a large diameter from the inflow port 16 to the injection port 18.
[0052]
Note that a heating device (not shown) as a heating means may be attached to the inside of the peripheral wall of the extrusion die 19 or the flange 17. The extruded dough 79 extruded from the extruder 70 by the heater is also kept warm while passing through the communication hole from the extruding die 19 and the flange 17, so that the extruded dough 79 flowing from the extruding die 19 into the forming die 10 is formed. The fluid state becomes good.
[0053]
Moreover, unlike the general die, the extrusion die 19 has a large injection port 15, so that a large amount of molten raw material (in this embodiment, woody synthetic powder) can be discharged, and consolidation is promoted. Since it is formed in a shape that can be used, die clogging which occurs in a normal extrusion die does not occur.
[0054]
(3) Forming Die In FIGS. 2 to 4, reference numeral 10 denotes a forming die into which an extruded fabric 79 extruded from the extruder 70 via the above-mentioned connecting means is introduced.
[0055]
The forming die 10 has a forming chamber 22 including a melting section 21a for heating the extruded dough 79 introduced therein and a gradual cooling section 21b for gradually cooling the extruded dough 79 extruded from the melting section 21a. A core 40 to be formed is provided.
[0056]
The molding chamber 22 is formed by forming two metal plates, upper and lower, each provided with heating and cooling means, into a rectangular cross section with metal spacers (not shown) arranged on both side edges. Adjust so that the thickness of the molded plate is obtained.
[0057]
The forming die 10 has, for example, a rectangular cross section with a width of 230 mm and a height of 250.7 mm, and the distance from the inlet to the outlet of the forming chamber 22 is 1000 mm.
[0058]
In the present embodiment, the melting portion 21a forms a flow path for a 61 mm long extruded dough 79 having an inlet and an outlet having the same shape as the injection port 18 of the flange 17, and has the same shape as the inlet of the melting portion 21a. An annealing section 21b having a cross-sectional shape is formed, and the forming chamber 22 is formed to have a constant cross-sectional shape in the extrusion direction.
[0059]
In FIG. 3, reference numeral 14 denotes a heater, which is composed of a heating means such as an electric heater, and heats and maintains the extruded dough 79 to maintain the fluidity of the extruded dough 79. is set up.
[0060]
Reference numeral 25 denotes a cooling pipe, which is an example of a cooling means for cooling the slow cooling portion 21b of the molding chamber 22. A cooling liquid is supplied to the cooling pipe 25 to extrude the extruded material 79 in the molding chamber 22 outside the cooling pipe. Cool from. The cooling pipes are inserted at equal intervals into the cooling section 21b, which occupies three-quarters in the direction of the forming die outlet 23 (see FIG. 6). It should be noted that the cooling pipes 25 can be provided so as to be gradually narrowed, or the cooling pipes 25 can be provided on the outer wall of the molding die 10. However, it is sufficient that the extruded fabric 79 in the molding chamber 22 can be cooled. However, the present invention is not limited to this structure.
[0061]
It is preferable that the inner wall surface of the molding die 10 is coated with a fluororesin. The method of coating the fluororesin may be performed by directly coating the surface with the fluororesin. However, the fluororesin is coated on a sheet serving as a base material in that exchange is easy and the durability is high. It is preferable to perform this by attaching a fluororesin sheet 50 '.
[0062]
The fluororesin sheet 50 ′ can be applied only to the upper and lower inner wall surfaces of the molding chamber 22, that is, only to the inner wall surface corresponding to the surface forming the front and back surfaces of the woody synthetic material composition 29. It is preferable to stick the entire inner wall surface in a series.
[0063]
The fluororesin sheet 50 'to be attached to the inner wall surface of the molding die 10 is a glass fiber fabric as a base material, which is coated with a fluororesin (hereinafter, referred to as "glass fiber fluororesin sheet" in the present specification). And the like, but a woven fabric of aramid fibers (hereinafter referred to as “aramid fiber fluororesin sheet” in the present specification) which is impregnated with a fluororesin dispersion described below, dried and fired is used. Is preferred.
[0064]
3 to 5, reference numeral 40 denotes a core body, and the core body 40 has roughly the same cross-sectional shape as the cross-sectional shape of each hollow portion formed in the woody synthetic material composition 29, A dividing portion 48 having a plurality of rod-shaped members 48a to 48c projecting from the melting portion 21a of the forming die 10 toward the forming die outlet 23 side (the left side in FIG. 4) substantially in parallel with the extrusion direction of the extruded material 79; The connecting portion 45 is formed continuously with the dividing portion 48 and connects the upstream ends of the rod-shaped members 48a to 48c constituting the dividing portion 48.
[0065]
In the present embodiment, the rod-shaped members 48a to 48c constituting the above-mentioned divided portion 48 are tapered to slightly narrow the rectangular cross section from the melting portion 21a of the forming die 10 toward the forming die outlet 23 side. Therefore, the wooden synthetic material composition 29 is configured to be easily extruded toward the forming die outlet 23.
[0066]
In the present embodiment, as shown in FIG. 4, the length is 681 mm, the height at the entrance end of the forming die 10 (right side in FIG. 4) is 34.5 mm, the width is 25.4 mm, and the end of the forming die exit 23 is. In the part (left side in FIG. 4), a height of 33.8 mm, a width of 2681 mm, and a length of 681 mm between two tapered rod-like members 48a and 48c gradually narrowing the rectangular cross section thereof to 24.8 mm. A tapered one that gradually narrows its rectangular cross section to a height of 34.5 mm and a width of 24.4 mm at the inlet end and a height of 33.8 mm and a width of 23.8 mm at the end of the forming die outlet 23. The rod-shaped members 48b are provided substantially in parallel with the two rod-shaped members 48a and 48c at a predetermined interval, and the three rod-shaped members 48a to 48c are formed in the melting portion 21b of the molding die 10 with these three rod-shaped members 48a to 48c. Member 48a 48c and are joined by integrally formed connecting portion 45, the core body 40 is formed in a substantially comb shape as a whole by the coupling portion 45 and the rod-like member 48a through 48c.
[0067]
The number of the rod-shaped members 48a to 48c of the divided portion 48 can be two or less, or four or more, depending on the number of hollow portions formed in the wooden synthetic material composition 29, and the cross-sectional shape is also limited to a rectangle. Instead, various shapes can be adopted.
[0068]
In the present embodiment, the connecting portion 45 of the core body 40 formed by connecting the rod-shaped members 48a to 48c is a block having a length of 116 mm, a height of 21.9 mm, and a width of 131.6 mm. As shown in FIG. 4, both ends of the extruded dough 79 at the upstream side in the extrusion direction are rounded at both corners in a plane, and swelled in a semicircular arc in a vertical section as shown in FIG. It is formed in a rounded shape, and is formed so as to reduce frictional resistance generated between the material and the extruded fabric 79.
[0069]
Further, the connecting portion 45 has an inclined portion 45a reaching the gap 46 formed between the rod-shaped members 48a to 48c in the extrusion direction of the extruded fabric 79, and the inclined portion 45a is, as shown in FIG. The extruded dough 79 is formed so as to easily flow into the gap 46 formed between the rod-shaped members 48a to 48c.
[0070]
Further, the core body 40 is formed integrally with a base 44 fixed to the upper and lower inner walls of the fusion portion 21a of the molding die 10 at a joining portion 45 on the entrance side of the molding die 10, and the fusion portion 21a Is formed in a streamlined manner in a plane so that the extruded dough 79 flowing through the flat surface flows without resistance.
[0071]
A cooling medium, such as a liquid such as water or oil, air, or another gas, is supplied to the upper inner wall surface of the molding die 10 to which the base portion 44 of the core body 40 is fixed, through the wall surface of the molding die 10. An introduction path 41 communicating with a supply source of a cooling medium (not shown) is formed, and the introduction path 41 of the cooling medium penetrates through the wall surface and the base 44 of the forming die 10 to the core body 40 in the fusion part 21a. In the cooling section 21b, the cooling medium communicates with a cooling medium flow path 42 described later formed in the core body 40.
[0072]
The cooling medium introduction passage 41 formed in the core body 40 is surrounded by a heat insulating material 43 to prevent the cooling medium passing through the introduction passage 41 from cooling the extruded dough in the portion. The temperature of the cooling medium is maintained to improve the cooling effect when the cooling medium is introduced into the cooling medium flow path 42 described later.
[0073]
In the present embodiment, the wall of the forming die 10, the base 44, and the core 40 are penetrated by a metal pipe having a diameter of 4 mm in which Myolex PMX-575 (Ryoden Kasei) is disposed as a heat insulating material on the outer periphery. This is defined as a cooling medium introduction path 41.
[0074]
In the present embodiment, the flow path 42 communicates at one end with the cooling medium introduction path 41 as described above, and opens the other end at the end of the core body 40 (toward the forming die outlet 23). And The cooling medium introduced into the flow path 42 passes through the flow path 42 formed in the core body 40 and the hollow portion formed in the woody synthetic material composition 29 and extruded dough 79 and the woody synthetic material The composition 29 is gradually cooled from the inside. Instead of the above-described configuration, the flow path 42 has, for example, a double pipe structure that communicates with the end of the core body 40 on the side of the forming die outlet 23 in the slow cooling section 21b. While communicating with the source, the other may be communicated with the outlet of the cooling medium, and the cooling medium, for example, cooling water or cooling oil, may be configured to circulate in the core body 40. Various designs can be changed according to changes in the type of the cooling medium to be introduced and other various conditions as long as the structure can be gradually cooled.
[0075]
As in the case of the inner wall surface of the forming die 10 described above, at least a part of the core body 40 is covered with the container 50 of the fluororesin sheet 50 ′ in order to reduce friction with the extruded cloth 79. The container 50 is easy to attach and detach and replace, and is suitable for use with a three-dimensional core.
[0076]
As the fluororesin sheet 50 ′ forming the container 50, any material may be used as long as it can be formed as the container 50. However, a woven fabric of aramid fibers is impregnated with a fluororesin dispersion and dried. It is preferable to use the baked aramid fiber fluororesin sheet 50 'described above.
[0077]
Aramid (a wholly aromatic polyamide) constituting the base material of the aramid fiber fluororesin sheet 50 'has excellent heat resistance, high strength and high Young's modulus, and is therefore used as a reinforcing material. The fluororesin sheet 50 ′ made of cloth as a base material has flexibility and bending resistance suitable for use by being attached to the three-dimensional core body 40, and has high tensile strength. It can withstand use.
[0078]
Examples of the fluororesin used for the aramid fiber fluororesin sheet 50 ′ include polytetrafluoroethylene (registered trademark Teflon TFE; Dupont), fluorinated ethylene-propylene copolymer (registered trademark Teflon FEP), and poly (trifluoroethylene chloride). (Registered trademark Teflon CTFE), polyvinylidene fluoride (registered trademark Teflon VdF), and the like.
[0079]
In the present embodiment, as an example of the aramid fiber fluororesin sheet 50 ′, a fluororesin coating sheet for liner belt “Max Liner Belt” (HAS-P506) manufactured by Honda Sangyo Co., Ltd. is used. .
[0080]
Although the entire core body 40 may be covered by the container 50 of the aramid fiber fluororesin sheet 50 ′, at least a part of the core body 40 located in the fusion part 21 a is covered, and If it is, it is coated on the connecting portion 45. The aramid fiber fluororesin sheet 50 ′ is formed of a bag-like body or a cylindrical body by joining and bonding it with an adhesive or an adhesive due to its flexibility and bending resistance, It is preferable to cover the joint portion 45 of the core body 40 and the like. .
[0081]
(4) Picking-up means In FIG. 6, reference numeral 30 denotes a pick-up means, which is arranged on the forming die outlet 23 side and picks up the wood synthetic material composition 29 extruded through the forming die outlet 23.
[0082]
In the embodiment shown in FIG. 6, the take-up means 30 comprises a plurality of rollers 31 wound simultaneously by an endless belt 33, which are vertically opposed to each other. And at least one of the rollers 31 is a driving roller 31 a connected to a driving source, and upper and lower rollers 31, 31 are connected via an endless belt 33. The wooden synthetic material composition 29 sandwiched therebetween is configured to be pulled in the extrusion direction by the rotation of the drive roller 31a.
[0083]
Next, an example of using the woody synthetic material composition 29 will be described. Here, an example of use for a product 80 (for example, a lattice or the like) and a manufacturing method will be described with reference to FIGS. The product 80 includes a hollow portion 84a formed in a long direction and a plurality of through-holes 81 to 83 formed in the vertical direction on the hollow portion 84a. Hollow legs 85 to 87, a plurality of hollow fixing members 88a to 88c and 89 for fixing the hollow legs 85 to 87 to the titanium oxide-containing synthetic wood composition 84, and a hollow leg shorter than the hollow legs 85 to 87. 91 to 93, connecting plates 94 and 95 connecting the upper portions of the hollow legs 85 to 87, a locking plate 96 for locking the hollow legs 85 to 87 to the titanium oxide-containing synthetic wood composition 84, and the like. It is a thing. As shown in FIG. 8, a plurality of through holes 81 to 83 through which the hollow legs 85 to 87 can penetrate in the vertical direction are provided at one end of the titanium oxide-containing woody synthetic material composition 84 at predetermined intervals along the hollow 84 a. They are formed at appropriate intervals. The hollow portion 84a and the through holes 81 to 83 have a structure communicating with each other. Grooves 85a, 86a, 86b, 87a for locking the communication plates 94 and 95 are formed in the upper portions of the hollow legs 85 to 87. Screw holes 85c to 87c are formed at the center of the hollow legs 85 to 87, and screws 88d to 88f screwed into hollow fixing members 88a to 88c in which the hollow legs 85 to 87 are inserted can be fixed. I have. One end of each of the hollow fixing members 88a to 88c is fitted to the hollow fixing member 89 having the recess 89a, and is screwed into the hollow legs 85 to 87 and / or the hollow fixing members 88a to 88c by screws 89b to 89d. It is configured. The hollow legs 91 to 93 are fixed with screws 100 to a block 97 or the like fixed with screws 90 at predetermined intervals or at appropriate intervals on one end side on the back side of the titanium oxide-containing synthetic wood composition 84. The hollow legs 85 to 87 are arranged symmetrically with the hollow legs 91 to 93 at the longitudinal end of the hollow 84a of the titanium oxide-containing synthetic wood composition 84.
[0084]
Other uses of the synthetic wood composition 29 include furniture (tables, chairs, wardrobes, office desks, TV stands, etc.), interior products, partition panels, floor panels, roof panels, bathroom panels, toilet panels, exterior materials, Interior materials, temporary houses, storerooms, entrance doors, interior doors, counters, flower boxes, lattices, kennels, pet supplies, DIY supplies, marine panels, formwork panels, sound insulation panels, flowerpots (flower pots), planters, etc. No. These products to which the wood-based synthetic material composition 29 is applied have performance exceeding that of particle board, MDF, plywood and even natural wood, and also have an air purifying effect.
[0085]
【The invention's effect】
According to the first to eighth aspects of the present invention, the following effects are provided.
(1) By applying a titanium oxide-containing paint to the surface and sanding the surface after the application to expose the titanium oxide, it is possible to suitably manufacture a titanium oxide-containing wood synthetic material composition having an air cleaning effect. it can. In particular, titanium oxide is expensive, but a small amount of titanium oxide sufficiently exhibits an air-cleaning effect, so that it can be manufactured at low cost.
(2) By forming irregularities and scratches on the surface of the woody synthetic material composition, the application and sanding of the titanium oxide-containing paint becomes easy, and the titanium oxide-containing woody synthetic material composition can be easily produced.
(3) By sanding, titanium oxide can be exposed on the surface, and a unique color tone, woody feeling, and natural feeling can be obtained. For example, it has a calm and deep appearance that is indistinguishable from a natural tree, has little light reflection, and can produce a sense of quality. In addition, various beautiful and wonderful tasteful colors such as black, green, and red can be obtained. Further, since the grooves and irregularities of the grain can be formed in a natural shape, the grain does not look flat.
(4) If the titanium oxide is included in the gelatin and applied to the surface, the gelatin is eluted and the titanium oxide is exposed only by heating with hot water or the like, so that the titanium oxide-containing wood synthetic material composition is further simplified. Can be manufactured.
[0086]
In addition, the wood-based synthetic material composition containing titanium oxide also has the following characteristics, so that it can be used as a raw material for various products.
It has excellent bending strength (about twice the MDF). Less expansion and contraction. Has dimensional stability comparable to aluminum. Hard surface hardness (about 5 times that of wood, abrasion resistance about 7 times that of red cedar). Wood screw holding power is better than wood (about 4 times of particle board, about 5 times of MDF). It is strong in water and does not rot (it absorbs only about 3% when soaked in water for 30 days). Good heat resistance (does not soften even at a high temperature of 120 ° C). It does not crack even if left outdoors for a long time (it can withstand low temperatures of -30 ° C). Insects do not eat. No mold. There is a feel of natural wood. Processing is easy because it contains a large amount of wood flour. Sculpture processing is free. There is no harm from adhesives (formaldehyde) contained in conventional building materials such as particle board, MDF, and plywood. The hollow plate shape can be lightened by making it a hollow shape. Since the recovered thermoplastic resin obtained from the waste material of the thermoplastic synthetic resin product can be used, it can be produced at low cost. The woody synthetic material composition itself can be recycled many times.
[Brief description of the drawings]
FIG. 1 is a process chart showing an example of a method for molding a woody synthetic material composition of the present invention.
FIG. 2 is a partial sectional view of an extruder 70 of the extrusion molding apparatus 1 according to the embodiment of the present invention.
FIG. 3 is a partial cross-sectional view of a connecting means and a molding die 10 of the extrusion molding apparatus 1 according to the embodiment of the present invention.
FIG. 4 is a plan sectional view of a molding die 10 of the extrusion molding apparatus 1 according to the embodiment of the present invention.
FIG. 5 is a partial cross-sectional view of a core body 40 according to the embodiment of the present invention.
FIG. 6 is a partial cross-sectional view of the forming die 10 and the take-off means 30 in the embodiment of the present invention.
FIG. 7A is a plan view of an aramid fiber fluororesin sheet 50 ′, and FIG. 7B is an IXB-IXB cross-sectional view of the aramid fiber fluororesin sheet 50 ′.
8 is an exploded perspective view of the interior product 80. FIG.
9 is an assembly view of the interior product 80. FIG.
10 is a detailed exploded view of a corner portion of the interior product 80. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Extrusion molding apparatus 10 Molding die 13 Inlet (of extrusion die)
14 Heater 15 Injection port (of extrusion die) 16 Inflow port (of flange)
17 Flange 18 Injection port (of flange) 19 Extrusion die 21a Melting part 21b Slow cooling part 22 Molding chamber 23 Molding die outlet 25 Cooling pipe 29 Woody synthetic material composition 29a Rib 30 Pick-up means 31 Roller 31a Drive roller 33 Endless belt 40 Medium Subunit 41 Introducing path 42 Flow path 43 Insulating material 44 Base 45 Connecting part 45a Inclined part 46 Gap 48 Divided part 48a to 48c Bar-shaped member 50 Fluororesin sheet accommodating body 50 '(aramid fiber) Fluororesin sheet 70 Extruder 71 Screw 72 Gear reducer 73 Hopper 74 Barrel 75 Band heater 76 Screen 79 Extruded fabric

Claims (8)

Forming a woody synthetic material composition from a woody synthetic powder obtained by mixing 40 to 60% by weight of a cellulosic crushed material and 60 to 40% by weight of a thermoplastic resin;
Applying a paint containing titanium oxide to the surface of the woody synthetic material composition,
A method for producing a wood composite material containing titanium oxide, wherein the coating is polished after the application to expose the titanium oxide to the surface. The method for producing a woody synthetic material composition according to claim 1, wherein the paint is a mixture of the titanium oxide in a toluene solvent. 3. The method according to claim 1, wherein the paint is a mixture of a pigment. After applying the paint, apply a colorant mixed with the pigment,
The method for producing a titanium oxide-containing wood-based synthetic material composition according to any one of claims 1 to 3, wherein, after the application, the paint and the colorant are polished to expose the titanium oxide to the surface. Forming a woody synthetic material composition from a woody synthetic powder obtained by mixing 40 to 60% by weight of a cellulosic crushed material and 60 to 40% by weight of a thermoplastic resin;
Applying gelatin containing titanium oxide to the surface of the woody synthetic material composition,
A method for producing a titanium oxide-containing wood synthetic material composition, comprising heating the surface of the wood synthetic material composition after the application to elute the gelatin and exposing the titanium oxide to the surface. The method for producing a titanium oxide-containing wood composite material according to any one of claims 1 to 5, wherein irregularities or scratches are formed on the surface of the wood composite material composition. The method for producing a wood composite material containing titanium oxide according to any one of claims 1 to 6, wherein the wood composite material composition is a plate having a hollow structure. A titanium oxide-containing wood synthetic material composition produced by the method for producing a titanium oxide-containing wood synthetic material composition according to any one of claims 1 to 7.

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