JP4240992B2 - Manufacturing method of laminate - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a laminate composed of a film composed mainly of a plastic film suitable for packaging of mechanical parts, electronic parts, experimental samples in space, foods and drinks, Ringer's solution, blood transfusions, cosmetics, etc. It is related with the manufacturing method.
More specifically, the bag formed from the film has no contamination with microorganisms or foreign matter attached to the inner surface, is excellent in hygiene, and can form a beautiful printed pattern on the surface. The present invention relates to a method for producing a laminate having excellent appearance and barrier properties.
[0002]
[Prior art]
Conventionally, laminated films and laminated sheets mainly made of plastic are formed into a single layer and printed as desired, or coated with a barrier material or heat-sealable material, or laminated with a film. For example, a laminated film or laminated sheet having a comprehensive function, a plastic bag using the laminated film, a plastic tube, and the like are widely known.
[0003]
These laminates are made of a variety of materials, and there are many manufacturers, and in the film laminating process and bag making process, cutting scraps when cutting materials, and foreign materials such as dust and insects that accompany the loading and unloading of materials. Because it comes into contact with bacteria, airborne bacteria, rolls of manufacturing equipment, etc., it may adhere not only to the surface of films and bags, but also to the inner surface. Therefore, the required level of prevention of contamination is increasing.
In order to prevent such foreign matter from adhering, clean air is removed from the inside of the work place, and plastic films and other materials used for processing are transported in a packaged state and unpacked in the front chamber. Although it is carried into the workplace and processed in the clean room, it is a workplace where the presence of people and microorganisms (insects) is completely eliminated, and there is no adhesion of foreign matter to plastic films or plastic bags. In fact, it is not an exaggeration to say that it is extremely difficult in terms of cost / effectiveness.
[0004]
In order to prevent the adhesion of foreign matters generated in the manufacturing process of such laminated films, the applicant of the present application prior to the present application, for example, as a conventional plastic film or plastic bag, for example, a tube having heat sealability In a laminated body provided with a reinforcing layer having a softening temperature higher than that of the film, a laminated body in which the reinforcing layer has a reinforcing layer having at least a barrier layer and a method for producing a bag using the laminated body are provided (for example, Patent Document 1). reference.).
In addition, for example, a thin film having a barrier property is formed on the upper and lower surface of the tubular film made of a synthetic resin inflation film, and the reinforcing film is attached to the tubular film via a dry laminate adhesive. A laminated film for forming a barrier container characterized by being laminated and a barrier container using the same have been proposed (for example, see Patent Document 2).
[0005]
[Patent Document 1]
JP-A-10-235773
[Patent Document 2]
JP-A-11-105180
[0006]
[Problems to be solved by the invention]
However, since air is usually contained inside the tubular film (tube), if the reinforcing material is bonded to the outer surface of the tube using a conventional smooth pressing rubber roll, the pressing rubber roll Since air accumulates in front of the tube, wrinkles are generated on the bonding surface, the appearance is inferior, and a part of the reinforcing material floats from the outer surface of the tube at the flange portion, so the bonding strength of the bonding surface However, since the air is weakened and air passages are formed on the bonding surface, there is a problem that the barrier function of the reinforcing material cannot be fully exhibited.
In addition, when pasting together using a conventional smooth rubber roll for pressing, in order to prevent wrinkles from accumulating air in the tube in front of the roll, the device is stopped, the rubber roll is removed once, Since the tube is cut at any time to release the air in the tube and the rubber roll is attached again, there is a problem that the yield at the time of manufacturing the laminate is significantly deteriorated.
[0007]
[Means for Solving the Problems]
Therefore, in order to solve the above-mentioned problems, the present inventors have intensively studied and as a result, the present invention provides an outer surface of a tubular film having heat sealability and a reinforcing material having a higher heat softening temperature than the tubular film. A method for manufacturing a laminate, comprising laminating and laminating via an adhesive layer, the tubular film and the reinforcement Material Between the smooth roll and the concavo-convex roll, and laminated and laminated while being held in the roll recess while the air in the cylindrical film is dispersed. However, in the manufacturing process, the bag body formed from the film is free from contamination with foreign substances and foreign matter, has excellent hygiene, has no wrinkles, and can form a beautiful printed pattern on the surface. The inventors have found that a bag body having excellent barrier properties can be produced.
In the above, according to the present invention, the adhesive layer comprises a melt-extruded resin layer, and the reinforcing material The tubular film The laminate is extruded and laminated via the melt-extruded resin layer, and is laminated.
Moreover, the said uneven | corrugated roll concerns on the manufacturing method of the laminated body characterized by forming the single or several groove part extended in a spiral form from the center part of the trunk | drum surface of the said roll to both ends.
Furthermore, in the above, the width of the concavo-convex roll is shorter than the width of the raw film of the cylindrical film, and the method for producing a laminate is characterized by the above.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be specifically described.
FIG. 1 is a schematic cross-sectional view of a laminate of the present invention, FIG. 2 is a schematic view of a bag of the present invention, and FIG. 3 is a schematic diagram showing an arrangement when the present invention is made in a single row. 4 and 14 are schematic views showing a laminating machine for producing the laminate 10, and FIGS. 5 to 9 are front views showing an example of an uneven roll used in the laminating apparatus of FIG. FIG. 10 and FIG. 11 are enlarged views showing an example of the pattern of the uneven roll surface, and FIGS. 12 and 13 are schematic cross-sectional views showing an example of the vicinity of the surface of the uneven roll.
[0009]
In the present invention, the material constituting the laminate, bag and the like according to the present invention as described above, and the production method thereof will be described. First, FIG. 1 is a schematic cross-sectional view of the laminate 10 of the present invention. As shown in FIG. 1, the laminated body 10 includes a reinforcing material 5 (51 and 52) having a softening temperature higher than that of the heat-sealable tube via an adhesive layer 31 on the outer surface of the heat-sealable tube T that has been flattened. ).
The reinforcing material 5 is obtained by sequentially laminating a base film 1 provided with a printed pattern layer 2 from the outside, one kind or two or more kinds of barrier layers 4 and a heat seal layer 9 via an adhesive layer 3. .
In the reinforcing material 5, the base film 1 is an essential layer, and the printed pattern layer 2, the adhesive layer 3, the barrier layer 4, and the heat seal layer 9 are essential layers as will be described later. Instead, it is a layer provided as necessary.
[0010]
Next, the manufacturing method of the laminated body 10 of this embodiment is demonstrated.
FIG. 4 is a schematic view showing an example of an apparatus for manufacturing the laminate 10 by bonding the reinforcing material 5 of the present invention and the heat-sealable tube T together.
As shown in FIG. 4, first, the winding of the reinforcing material 51 is set from the first paper feed 101 in the first step, and if necessary, in the primer application step 121, a polyester / isocyanate resin or the like is used. After applying the primer, it may be dried. Next, the winding of the heat-sealable tube T is set from the second paper feed 102, and the reinforcing material 51 is supplied from the first paper feed and melted on one side thereof. The melt-extruded resin layer is extruded from the T-die 106 of the extrusion laminator and applied as the adhesive layer 31. At the same time, the melt-extruded resin layer is heated from the second paper feed 102 so as to be sandwiched between the reinforcing material 51 and the heat-sealable tube T. The sealing tube T is supplied, and then the air is passed through between the cooling roll 132 having a smooth surface and the rubber roll 131 having a concavo-convex surface so that the air in the cylindrical film is removed. Pressed while dispersing in a state held in Le recess, it is adhered by thermal fusion a reinforcing member 51 and the heat sealable tube T, taken up by the take-up roll 105 of the laminate, to obtain a laminated sheet 11.
Next, in the second step, another winding of the reinforcing material 52 is set from the first paper feed 101, and in the same manner as in the first step, if necessary, in the primer application step 121, a polyester / isocyanate resin After the primer such as is applied, it may be dried. The laminated sheet 11 obtained above is set from the second paper feed 102, and the reinforcing material 52 is supplied from the first paper feed in the same manner. A melt-extruded resin layer is extruded from a T-die 106 of an extrusion laminator and applied as an adhesive layer 31 melted on the side, and at the same time, the melt-extruded resin layer is sandwiched between the reinforcing material 52 and the laminated sheet 11 from the second paper feed 102. The laminated sheet 11 is supplied, and then the air is passed through a cooling roll 132 having a smooth surface and a rubber roll 131 having an uneven surface, and the air in the tubular film is held in the roll recess. The reinforcing material 52 and the heat-sealable tube T are bonded by heat fusion and wound around the winding roll 105 of the laminated body to produce the laminated body 10 according to the present invention. it can.
In addition, as the said pressing roll, as shown in FIGS. 5-9, using the roll which formed uneven | corrugated shape on the surface of the roll, the heat seal layer 9 and the heat sealable tube of the reinforcing material 51 and the reinforcing material 52 By bonding T to the heat-sealable tube T while dispersing the air, the amount of bubbles entrained on the bonding surface is suppressed, and there is no wrinkle, while maintaining barrier properties and excellent appearance and hygiene. It has the advantage that the laminated body 10 which concerns on this invention can be manufactured.
[0011]
Moreover, the manufacturing method of the laminated body 10 which concerns on this invention is not restricted to the said method, For example, you may manufacture with what is called a tandem machine in which two extrusion laminators as shown in FIG. 14 are installed, A winding of the reinforcing material 51 is set from the first paper feeding 101, and a winding of the reinforcing material 52 is set from the second paper feeding 102. If necessary, in the primer application steps 121 and 122, a polyester / isocyanate system is used. After applying a primer such as resin, it may be dried, set the winding of the heat-sealable tube T from the third paper feed 103, install two extrusion laminators, and extrude the melt-extruded resin layer as the adhesive layer 31 It is extruded from laminator T dies 106 and 107 and applied to the reinforcing material 51 and the reinforcing material 52, respectively, and at the same time, the reinforcing material 52, the heat-sealable tube T and the laminated sheet 1 The heat-sealable tube T is supplied from the third paper feed 103 so as to be sandwiched by the melt-extruded resin layer, and thereafter, between the cooling rolls 132 and 134 having a smooth surface and the rubber rolls 131 and 133 having an uneven surface. Through, the air in the heat-sealable tube T is dispersed and pressed while being held in the roll recess, and the reinforcing material 52 and the heat-sealable tube T are bonded by heat fusion, and the winding roll of the laminated body 105 winding-up can manufacture the laminated body 10 which concerns on this invention in 1 process.
It is also possible to previously form a melt-extruded resin layer on the reinforcing material 51 and the reinforcing material 52 and heat-seal the heat-sealable tube T.
[0012]
Further, in the above production method, the laminate 10 is produced by extrusion lamination through a melt-extruded resin layer as a lamination method, but is not limited thereto, and dry lamination using a laminate adhesive or Even when wet lamination is performed, bonding between the concavo-convex roller and the smooth roller can prevent generation of wrinkles, and a laminate having excellent appearance, barrier properties, and hygiene can be manufactured.
Furthermore, a laminated body can be bonded together with high production efficiency in one process using a tandem machine in which two laminate coating apparatuses are installed using an adhesive.
[0013]
In the present invention, in the step of bonding the reinforcing material and the heat-sealable tube through the melt-extruded resin layer and between the uneven roller and the smooth roller, the concave portion of the roll can be bonded by heat, and therefore in the subsequent step. It is preferable because the adhesive strength between the layers can be adjusted by heat sealing.
On the other hand, in the step of bonding with the concave and convex roll using a dry laminate adhesive, the adhesive strength of the bonding surface of the film raw material wound around the concave portion of the roll is not secured, and in the subsequent step The adhesive strength can no longer be adjusted.
Therefore, as shown in FIG. 5, FIG. 6, FIG. 7, and FIG. 9, a roll having independent concave portions as shown in FIG. 8, FIG. 10, and FIG. It is preferable to use it, and it is more preferable if the sizes p and n of the recesses are one half or less of the width of the heat seal applied at the time of bag making.
For this reason, in the present invention, the laminate 10 is produced by using a melt-extruded resin layer and is bonded to the laminate 10 using a laminating adhesive. In addition, it does not require the aging time required when using a dry laminate adhesive, and therefore has an advantage of being excellent in production efficiency.
[0014]
Next, the shape of the uneven | corrugated roll used at the bonding process of the laminated body 10 of this embodiment is demonstrated.
FIG. 5 is a conceptual diagram showing an example of the concavo-convex rubber roll used in the bonding apparatus shown in FIG. 4 and FIG. 14, and a single groove portion extending in a spiral shape is formed at both ends from the center portion of the roll body surface. Is.
As shown in FIGS. 5 (a) and 5 (b), the concave-convex rubber roll is formed with spiral grooves on the roll drum surface from 1 mm to 10 mm in width, 1 mm to 10 mm in depth, and 4 mm to 100 mm in pitch from both sides of the roll drum end. As for the size of the groove, an area corresponding to the amount of air in the heat-sealable tube T is required.
By using the concavo-convex rubber roll, the movement of the air in the heat-sealable tube T wound around the concavo-convex rubber roll in the roll axis direction is promoted, and the air in the heat-sealable tube T is concavo-convex while being held in the roll recess. Since the heat-sealable tube T and the reinforcing material are bonded together through the rubber roll and the smooth metal roll, it is possible to manufacture the laminate 10 that is free from wrinkles and has excellent appearance and barrier properties.
If the so-called tandem machine is not used for bonding in one process, but the so-called single machine is used for bonding in two processes, the reinforcing material 51 and the heat-sealable tube T are bonded via an adhesive layer in the first process. After laminating between the uneven roll and the smooth roll in FIG. 5, in the second step, the laminated sheet obtained in the first step is rewound and reversely wound, and then the uneven roll in FIG. 5 is interposed via the reinforcing material 52 and the adhesive layer. It is preferable to manufacture the laminated body 10 by laminating the film and a smooth roll.
In the above, since the grooves of the spiral concavo-convex roll are unidirectional, the air in the heat-sealable tube T is dispersed in the second step by reversely winding the laminated sheet obtained in the first step. This is preferable because it is difficult to generate wrinkles on the bonding surface and the laminate 10 can be manufactured.
On the other hand, if the laminated sheet obtained in the first step is bonded in the same winding direction in the second step without reverse winding, the air in the heat-sealable tube T cannot be dispersed and wrinkles are generated. This is not preferable.
[0015]
FIG. 6 is a conceptual diagram showing an example of an uneven rubber roll of another mode used in the bonding apparatus shown in FIGS. 4 and 14.
As shown in FIG. 6, the concavo-convex rubber roll forms a plurality of grooves extending in a spiral shape from the central part of the body surface of the roll to both ends.
The concave and convex rubber roll shown in FIG. 6 has spiral grooves from both sides of the roll barrel end so that the width is 1 mm to 10 mm, the depth is 1 mm to 10 mm, the pitch is 4 mm to 100 mm, and the groove intersection angle is 15 ° to 120 °. The groove is formed on the surface of the roll cylinder, and the size of the groove requires an area corresponding to the amount of air in the heat-sealable tube T.
Even if the laminated sheet obtained in the first step is bonded in the same winding direction in the second step without reverse winding, the air in the heat-sealable tube T can be dispersed and the generation of wrinkles is suppressed. More preferred.
[0016]
FIG. 7 is a conceptual diagram showing an example of an uneven rubber roll of another aspect used in the bonding apparatus of FIGS. 4 and 14.
As shown in FIG. 7, the concavo-convex rubber roll has a spiral shape so that the width 1 mm to 10 mm, the depth 1 mm to 10 mm, the pitch 8 mm to 100 mm, and the groove intersection angle 15 ° to 120 °, respectively, from both sides of the roll barrel end. Grooves are formed on the surface of the roll body, and further, annular grooves each having a width of 1 mm to 10 mm, a depth of 1 mm to 10 mm, and a pitch of 4 mm to 50 mm are formed in the rotation direction of the roll shaft.
In addition, even if it uses the uneven | corrugated rubber roll shown in FIG. 7 and it laminates in the winding direction as it is in the 2nd process without carrying out reverse winding of the lamination sheet obtained at the 1st process, there is no generation of wrinkles and production efficiency is improved. In order to improve, it is more preferable.
[0017]
12 and 13 are schematic cross-sectional views showing an example of the vicinity of the surface of the concavo-convex rubber roll. The concavo-convex shape of the concavo-convex rubber roll according to the present invention shown in FIGS. 5 to 7 and 9 is not limited to the concavo-convex shape of the straight line group as shown in FIG. 12, but as shown in FIG. It may be an uneven shape composed of a sine curve (R shape) curve group.
As shown in FIG. 13, by making the surface of the concavo-convex rubber roll into a concavo-convex shape consisting of a group of curves, by changing the pressing pressure of the roll, the area in contact with the cooling roll can be changed. By adjusting the amount of the empty wall, there is an advantage that the reinforcing material 5 (51, 52) can be bonded without generating wrinkles according to the amount of air in the heat-sealable tube T.
Further, even with a concavo-convex rubber roll having a concavo-convex shape of a straight line group, as shown in FIG. 12 (a), a concave portion is formed obliquely as shown in FIG. 12 (b), instead of forming a concave portion at a right angle. By changing the pressure applied to the roll, the area in contact with the cooling roll can be changed similarly to the concave-convex shape consisting of a group of curves, and therefore the amount of empty wall between both rolls can be adjusted. The reinforcing material 5 (51, 52) can be bonded without generating wrinkles according to the amount of air in the heat-sealable tube T.
[0018]
FIG. 8 is a conceptual diagram showing an example of an uneven rubber roll according to another embodiment.
As shown in FIG. 10 and FIG. 11, the concave portions (cells) of the concavo-convex rubber roll have a rhombus or rectangular shape consisting of a plurality of straight lines, a curved circular shape, or an elliptical shape on the entire surface of the body surface of the roll. May be.
For example, although the circular recessed part shown in FIG. 11 depends on the width of the raw material of the laminate 10, those having a diameter of 1 mm to 10 mm, a depth of 1 mm to 20 mm, and a pitch of 2 mm to 30 mm can be used. It is preferable that an area corresponding to the amount of air in the heat-sealable tube T is required, and the sizes n and p of the recesses are less than or equal to one-half of the width of the heat seal applied at the time of bag making.
In addition, using the uneven rubber roll shown in FIG. 10 and FIG. 11, even if the laminated sheet obtained in the first step is bonded in the same winding direction in the second step without reverse winding, no wrinkles occur, Since production efficiency improves, it is more preferable.
[0019]
FIG. 9 is a conceptual diagram showing an example of an uneven rubber roll according to another embodiment.
As shown in FIG. 9, the width s of each uneven rubber roll shown in FIGS. 5 to 8 is preferably less than the raw fabric width of the heat-sealable tube T.
By making the width s of each rugged rubber roll shorter than the width of the heat sealable tube T, it is possible to prevent air that is unevenly distributed and accumulated at both ends (folded portions) of the heat sealable tube T. As a result, generation of wrinkles at both ends of the tube is suppressed, and even when the winding roll rotation speed is increased to 100 m / min, no wrinkles are generated, and a laminate having excellent appearance, barrier properties, interlayer strength, etc. can be provided. , Has the advantage of reduced yield.
Specifically, the width s of each concavo-convex rubber roll is shorter than the width r of the raw material of the heat-sealable tube T by about 10 mm to 40 mm, which is equal to or greater than the bonding width (heat seal width) with the reinforcing material 5. And since the width | variety is safe even if the raw material of the reinforcing material 5 and the heat-sealable tube T meanders somewhat, it is preferable.
Also, as shown in FIG. 9 (b), by applying taper to both ends of the roll, the pressing pressure at the non-tapered portion will be reduced, so that the air accumulated in the tube will not be suppressed. As a result, an effect of preventing wrinkles similar to the above can be obtained, which is preferable.
[0020]
As a method for forming the uneven shape of the rubber roll according to the present invention, for example, a method of cutting to a desired size, a method of pouring a resin into a mold, a resin sheet having an uneven shape on the surface of a smooth roll, For example, there is a forming method such as winding and attaching a foamed trifluoroethylene film coated with an adhesive on the back surface.
Moreover, as a material of the rubber roll concerning this invention, what is normally used as a pressing roll can be used, For example, the roll etc. which coated silicon rubber, trifluoroethylene resin, etc. can be used.
[0021]
Next, the material constituting the laminate 10 according to the present invention will be described. As the heat-sealable tube T, polyethylene, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / acrylic acid ester copolymer are used. Not only single-layer tubes such as polymers, ionomers, and polypropylenes, but also these or these and co-extruded multilayer tubes of ethylene / vinyl acetate copolymer saponified products and nylon can be used.
The thickness of the heat-sealable tube T is arbitrary depending on the purpose of use of the packaging bag, but is preferably about 10 to 300 μm.
[0022]
The heat-sealable tube T according to the present invention forms a polyolefin resin such as polyethylene by a normal inflation method (blow tube) using a circular die, but the gas (air) for blowing is 0.5 μm or less fine particles Is filtered off with a filter and used.
Further, the use of an inert gas such as nitrogen gas or carbon dioxide gas as a gas has the advantage of suppressing the generation of solids such as resin oxides in the die and reducing the fine particles of smoke in the heat-sealable tube. Have
[0023]
The base film 1 constituting the reinforcing material according to the present invention is not limited as long as the base film 1 has a softening temperature higher than that of the heat-sealable tube. For example, polypropylene resin, polyethylene terephthalate resin, polyamide (6 nylon, 6,6 Nylon) resin, cellulose acetate resin, saponified ethylene / vinyl acetate copolymer and other stretched or unstretched films or sheets, paper, aluminum foil, etc. can be used.
The thickness of the film or sheet is arbitrary depending on the purpose of use of the packaging bag, but is preferably about 10 to 200 μm.
[0024]
As the barrier layer 4 constituting the reinforcing material according to the present invention, when a light barrier property or an oxygen gas barrier is required, a metal such as an aluminum foil or a biaxially stretched polyethylene terephthalate film or a biaxially stretched polypropylene film is used. Aluminum vapor deposition films (including partial vapor deposition) can be used.
Further, when the barrier layer 4 requires a transparent oxygen gas barrier property, for example, a film of a polyvinylidene chloride-based resin or a composition mainly composed of a polyvinylidene chloride-based resin or polyvinyl alcohol is coated. A resin film, a stretched polyamide resin film, a saponified ethylene-vinyl acetate copolymer film, a resin film having a vapor-deposited film of a metal oxide such as silicon oxide or aluminum oxide, or the like can be used.
In the above, the film thickness of the metal and inorganic oxide vapor-deposited film is preferably about 50 to 3000 mm, more preferably about 100 to 1000 mm.
In the present invention, examples of the resin film that supports the vapor deposition layer imparting the barrier property include, for example, polyester resin films such as polyethylene terephthalate, polyamide resin films such as various nylons, polyethylene resins, and polypropylene resins. Resin, cyclic polyolefin resin, polystyrene resin, acrylonitrile-styrene copolymer (AS resin), acrylonitrile-butadiene-styrene copolymer (ABS resin), polyolefin film such as polybutene resin film, polyvinyl chloride resin, polycarbonate Bonate resin, polyimide resin, polyamideimide resin, polyaryl phthalate resin, silicone resin, polysulfone resin, polyphenylene sulfide resin, polyethersulfone resin, polyurethane resin Can be used cellulose resin, poly (meth) acrylic resins, polyvinylidene chloride film, acetal resin film, fluorine-based resins, and other like.
In the present invention, it is particularly preferable to use a film or sheet of polypropylene resin, polyester resin, or polyamide resin.
The thickness of the above film or sheet is arbitrary, but is usually preferably about 5 to 300 μm, and more preferably about 10 to 100 μm.
[0025]
The heat seal layer 9 constituting the reinforcing material according to the present invention may be a resin film or sheet that can be melted by heat and fused to each other.
For example, low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-methyl acrylate A resin comprising one or more resins such as a copolymer, an ethylene-methacrylic acid copolymer, and an ethylene-propylene copolymer, or a sheet obtained by forming a film of these resins can be used.
Further, the thickness is preferably about 10 to 100 μm, and more preferably about 15 to 70 μm.
In the above, when the heat seal layer 9 is provided on the reinforcing material, the heat seal layer 9 of the reinforcing material 5 and the heat sealable tube T are bonded through the melt-extruded adhesive layer 31 between the uneven roll and the smooth roll, Since the heat seal layer 9, the melt-extruded adhesive layer 31 and the heat sealable tube T of the reinforcing material 5 are heat-melted, there is no wrinkle, the appearance is excellent, and sufficient interlayer strength is obtained without delamination. And, it has an advantage that the function of the barrier layer of the reinforcing material can be sufficiently exhibited.
[0026]
In addition, when one or more of the above-mentioned various resins are used and the film is formed, for example, film processability, heat resistance, weather resistance, mechanical properties, dimensional stability, antioxidant properties, slipping, etc. Various plastic compounding agents, additives, and the like can be added for the purpose of improving and modifying properties, releasability, flame retardancy, antifungal properties, electrical properties, strength, etc.
The addition amount can be arbitrarily added from a very small amount to several tens of percent depending on the purpose.
In the above, general additives include, for example, colorants such as lubricants, crosslinking agents, antioxidants, ultraviolet absorbers, light stabilizers, fillers, antistatic agents, antiblocking agents, dyes, pigments, and the like. Etc. can be used, and further, a modifying resin or the like can also be used.
[0027]
Also, if necessary, any printed picture layer such as letters, pictures, figures, symbols, etc. for displaying decoration, contents, display of the best period, display of manufacturer, seller, etc., etc. 2 can be provided on the front surface or the back surface of the base film 1.
Such a printed picture layer 2 can be formed, for example, by a normal printing method such as offset printing or gravure printing, flexographic printing, letterpress printing, silk screen printing, etc. using a normal ink composition.
The amount of printing ink applied is preferably about 1-8 μm in the dry state after application, and is 2-3 g / m. ² Is more preferable.
[0028]
Next, in the present invention described above, a method for producing a reinforcing material using the above materials will be described. As such a method, the base film 1, one kind or two or more kinds of barrier layers 4 (intermediate) Layer), a method of laminating a normal packaging material between the layers of the heat seal layer 9, for example, a wet lamination method, a dry lamination method, a solventless dry lamination method, an extrusion lamination method, T die extrusion molding, coextrusion lamination, inflation, coextrusion inflation, etc. can be used.
Thus, in the present invention, when performing the above-mentioned lamination, if necessary, pretreatment such as corona treatment, ozone treatment, frame treatment, etc. can be applied to the film.
Among these, in the present invention, the dry lamination method is more preferable because of excellent adhesive strength.
[0029]
In the above, as the laminating adhesive, for example, one-part or two-part curable or non-cured vinyl type, (meth) acrylic type, polyamide type, polyester type, polyether type, polyurethane type, epoxy type, etc. It is possible to use adhesives for laminating such as rubber type, other solvent type, aqueous type, or emulsion type.
As a coating method of the adhesive for laminating, for example, direct gravure roll coating method, gravure roll coating method, kiss coating method, reverse roll coating method, fountain method, transfer roll coating method, and other methods can be used. .
The coating amount is 0.1 to 10 g / m. ² (Dry state) is preferred, 1-5 g / m ² The (dry state) position is more preferable.
[0030]
Next, a method for manufacturing the laminate 10 by laminating the heat-sealable tube T and the reinforcing material 5 described above will be described. As such a method, for example, an interlayer between the heat-sealable tube T and the reinforcing material 5 is provided. For example, wet lamination method, dry lamination method, solvent-free dry lamination method, extrusion lamination method, T-die extrusion molding method, co-extrusion lamination method, inflation method, co-extrusion inflation It can be done by the method of the method and others.
Especially, in this invention, it can carry out by the extrusion lamination method etc. which laminate | stack through the melt extrusion resin layer 31 by melt extrusion adhesive resin.
[0031]
In the above, a resin layer composed of a thermoplastic resin layer is used as the melt-extruded resin layer 31, and the interlayer between the base film 1, one or more barrier layers 4 (intermediate layer), and the heat seal layer 9 is used. Can be used for gluing.
Specifically, the material of the adhesive melt-extruded resin layer 31 is low density polyethylene resin, medium density polyethylene resin, high density polyethylene resin, linear low density polyethylene resin, ethylene polymerized using a metallocene catalyst.・ Copolymer resin with α-olefin, ethylene / polypropylene copolymer resin, ethylene / vinyl acetate copolymer resin, ethylene / acrylic acid copolymer resin, ethylene / ethyl acrylate copolymer resin, ethylene / methacrylic acid Copolymer resin, ethylene / methyl methacrylate copolymer resin, ethylene / maleic acid copolymer resin, ionomer resin, vinyl acetate copolymer, polyolefin resin, unsaturated carboxylic acid, unsaturated carboxylic acid, unsaturated carboxylic acid Resin obtained by graft polymerization or copolymerization of anhydride and ester monomer, anhydrous male The phosphate can be used resins obtained by graft-modified polyolefin resin.
These materials can be used alone or in combination. Among them, in the present invention, the resin used for the melt-extrusion fat layer 31 is preferably a resin having a relatively low heat melting temperature, specifically, low-density polyethylene, ethylene / vinyl acetate copolymer, ethylene / acrylic acid. Use of a copolymer, an ethylene / acrylic acid ester copolymer, an ionomer, or the like is more preferable because it has an advantage that heat fusion inside the heat-sealable tube can be prevented.
The thickness of the resin layer is preferably about 5 to 30 μm.
In the present invention, by using the melt extrudable oil layer 31 described above, when the uneven roll for preventing wrinkles is bonded, the bonding surface of the film original wound around the roll is a recess. Even if it exists, it can adhere | attach by a heat | fever and it has the advantage that the adhesive strength of an interlayer can be adjusted with a heat seal in a post process.
[0032]
As shown in FIG. 1, the laminate 10 configured as described above has the same configuration of the reinforcing material 51 and the reinforcing material 52 provided on the other surface, or although not shown, for example, either one is made of an aluminum foil. By using a transparent barrier layer (for example, saponified ethylene / vinyl acetate copolymer, polyvinylidene chloride coat film) on the other surface, it is possible to change the structure and appearance of the front and back surfaces.
[0033]
As shown in FIG. 1, the bag body using the laminated body 10 according to the present invention is provided with a cutting position 7 at its end, and heat-sealed in the film processing direction by the heat seal part 6.
FIG. 2 is a schematic view of the bag of the present invention.
As shown in FIG. 2, the bag body of the present invention is a bag body having a bottom seal portion 61 and an opening portion 8, in the cross direction, heat sealed by the heat seal portion 60 and simultaneously cutting the laminate at the cutting position 76. Can be formed. The cutting position 76 is provided at a position about 0.5 to 2 mm away from the heat seal portion 61, and the bottom seal portion is formed in the heat seal portion 60 and the opening portion 8 is formed in the cutting position 71.
[0034]
FIG. 3 is a schematic diagram showing an arrangement in the case where bags are produced in a single row using the laminate 10 of the present invention.
As shown in FIG. 3, the laminate 10 of the present invention is heat-sealed at the heat seal portion 6 and the heat seal portion 66 provided in the processing direction of the laminate, and cut at the end cutting position 7 and the cutting position 76. A packaging bag can be formed.
Although not shown, it goes without saying that the heat seal portion 66 provided in the processing direction of the laminate and the cutting position 76 can be increased to perform multi-row processing.
[0035]
In the present invention, the contents of the bag manufactured as described above include, for example, inkjet nozzles, camera lenses, CD pickup lenses, mechanical parts such as VTR heads, hard disks, silicon wafers, IC / LSIs, etc. Fine parts such as dust are clogged with fine parts typified by electronic parts, and parts of precision equipment and the like that are easily damaged by foreign matters attached to impacts during transportation and the like are easily deteriorated.
Furthermore, as the contents of the bag body, for example, it can also be used for a sample created in an experiment conducted in outer space.
If the contents of the bag are not exposed to foreign matter such as dust from outside, and the bag is made of aluminum foil, it can be brought back to the earth without being exposed to air, contaminated, and carried. Is also possible.
Moreover, the bag body according to the present invention includes, in addition to articles such as the above-described precision instrument parts, for example, confectionery, seasonings, supermarkets, fruit juices, and other food and beverage products, pure water, Examples include various solids such as tablets, powders, Ringer's solution, blood transfusions, and other solids, liquids, and viscous articles.
[0036]
The heat-sealable tube T and the reinforcing material 5 as described above are passed between a smooth roll and an uneven roll, and the air in the heat-sealable tube T is laminated while being dispersed in a state where it is held in the roll recess. The laminated body 10 thus produced has no wrinkles on the bonding surface, and can form a beautiful printed pattern on the surface. Appearance, interlayer strength, hygiene, barrier properties, productivity, cost performance Etc.
Moreover, from the time of film formation of the heat-sealable tube T to the completion of bag making, the inner surface of the heat-seal surface is not exposed to the outside air, and it is possible to prevent microorganisms and other contaminants and foreign matter from adhering. It has excellent properties.
In addition, the bag body manufactured by heat-sealing the periphery of the above laminate is cut, provided with an opening, and is not exposed to the outside air until the contents are filled. By filling the contents in a clean room, at least the inner surface of the bag body is free from contamination with foreign matter and foreign matter and is sanitary.
[0037]
【Example】
Hereinafter, details of the present invention will be further described with reference to examples.
(Example 1) A biaxially stretched nylon film (base film 1) having a thickness of 15 μm and a surface provided with a pattern layer 2 by gravure printing and an aluminum foil (barrier layer 4) having a thickness of 9 μm were sequentially laminated. Reinforcing material 51 and reinforcement of the same structure by dry lamination between layers using polyester-isocyanate adhesive (adhesive layer 3) Material 52 was formed.
On the other hand, a linear low density polyethylene tube (heat sealable tube T) having a thickness of 35 μm subjected to double-sided corona discharge treatment by a so-called inflation method using a blown gas filtered with a filter of 0.5 μm.
[0038]
Next, as shown in FIG. 5 (a), the reinforcing material 51, the reinforcing layer 52, and the heat sealable tube T are used as concave and convex rubber rolls used in the laminating apparatus shown in FIG. A film having a spiral concavo-convex shape having a thickness of 4 mm, a groove width of 5 mm, and a pitch of 50 mm formed on the surface of the roll body was prepared in advance.
[0039]
Then, in the laminating apparatus as shown in FIG. 4, the uneven rubber roll shown in FIG. 5 (a) is set, and the winding of the reinforcing material 51 produced above is set from the first paper feed 23 in the first step. The winding of the heat-sealable tube T produced above was set from the second paper feed 25.
Next, the reinforcing material 51 is supplied from the first paper feed 101, and the molten extruded resin layer (adhesive layer 31) is extruded from the T die 106 of the extrusion laminator at an extrusion temperature of 305 ° C. The heat-sealable tube T from the second paper feed 102 is sandwiched between the surface of the aluminum foil (barrier layer 4) of the reinforcing material 51 and the one side of the heat-sealable tube T with the melt-extruded resin layer (adhesive layer 31). Supplied.
Subsequently, the reinforcing roll 51 and the heat-sealable tube T are bonded by heat fusion between the cooling roll 132 having a smooth surface and the rubber roll 131 having a concavo-convex surface. As a result of winding at a roll rotation speed of 40 m / min, lamination is performed in a state where the air in the heat-sealable tube T is dispersed and held in the roll recess, so that the amount of bubbles entrained on the bonding surface can be suppressed. Thus, a laminated sheet 11 having excellent appearance, barrier properties, interlayer strength, and hygiene was obtained.
[0040]
Next, in the second step, first, the laminated sheet obtained in the first step is rewound and reversely wound, and then a winding of another reinforcing material 52 is set from the first paper feed 101, and from the second paper feed 102. The laminated sheet 11 obtained above was set.
Similarly, the reinforcing material 52 is supplied from the first paper feed 101, and a molten extruded resin layer (adhesive layer 31) melted on one side thereof is extruded from a T die 106 of an extrusion laminator at an extrusion temperature of 305 ° C. and applied. The second paper feed 102 is sandwiched between the surface of the aluminum foil (barrier layer 4) of the reinforcing material 51 and the reinforcing material 52 and the heat-sealable tube T surface of the laminated sheet 11 with the melt-extruded resin layer (adhesive layer 31). The laminated sheet 11 was supplied from
After that, the cooling roll 132 having a smooth surface and the rubber roll 131 having an uneven surface are passed through and pressed while dispersing the air in the cylindrical film while being held in the roll recesses, and the reinforcing material 52 and heat The sealing tube T was adhered by heat fusion, and wound around the winding roll 105 of the laminated body at a winding roll rotation speed of 40 m / min to produce a laminated body 10 according to the present invention.
The obtained laminate 10 according to the present invention had no defects and was able to form a beautiful printed pattern, and was excellent in appearance, hygiene, interlayer strength, barrier properties and the like.
[0041]
Next, the laminated body 10 is attached to a bag making machine, and as shown in FIG. 3, heat seal portions 6 are provided at both ends thereof and cut at a cutting position 7.
Further, as shown in FIG. 2, a heat seal portion 60 that forms a bottom seal of the bag body is formed, cut at a cutting position 76 provided 2 mm from the heat seal portion, and simultaneously opened (bottom seal portion 61). A bag body according to the present invention having an outer dimension, 200 mm × 140 mm, and a seal width of 10 mm was prepared by providing the portion 8.
[0042]
The packaged body was obtained by storing the purified agar powder in the three-sided bag body obtained above, and then heat-sealing in the edge seal region to form an edge seal portion and sealing the bag.
The package manufactured above is hygienic, free from fouling of microorganisms or other foreign substances on the inner surface of the bag, has no wrinkles, can form a beautiful printed pattern on the surface, etc. It was excellent in interlayer strength, barrier properties and the like.
[0043]
(Example 2)
In the laminating apparatus shown in FIG. 4, the concave-convex rubber roll shown in FIG. 6 is set, and the laminates according to the present invention are used in the same material and manufacturing method as the reinforcing members 51 and 52 and the heat sealable tube T used in Example 1. A body 10 was produced.
6 is 20 mm shorter than the width of the heat-sealable tube T, and the depth of the roll is 4 mm, the groove width is 5 mm, the pitch is 50 mm, and the groove intersection angle is 60 °. What formed a spiral groove on the surface of the roll cylinder was used.
Even if the laminated sheet obtained in the first step is bonded in the same winding direction in the second step without reverse winding, generation of wrinkles is suppressed, and the roll rotation speed of winding is increased from 40 m / min to 100 m / min. Even so, no wrinkles occurred.
The laminate 10 according to the present invention obtained by the above production method, and the bag produced by the same production method as in Example 1 can be used to form a beautiful printed pattern. It was excellent in appearance, hygiene, interlayer strength, barrier properties and the like.
[0044]
(Example 3)
In the laminating apparatus shown in FIG. 4, the concave and convex rubber roll shown in FIG. A body 10 was produced.
The concave-convex rubber roll shown in FIG. 7 has spiral grooves formed on the surface of the roll cylinder so as to have a depth of 4 mm, a groove width of 5 mm, a pitch of 50 mm, and a groove intersection angle of 60 ° from both sides of the roll cylinder end. Further, the one that forms annular groove portions each having a groove width of 3 mm, a depth of 4 mm, and a pitch of 25 mm in the rotation direction of the roll shaft was used.
Further, even if the laminated sheet obtained in the first step is bonded in the same winding direction in the second step without being reversely wound, generation of wrinkles is suppressed, and the roll rotation speed of the winding is increased from 40 m / min to 100 m / min. No wrinkles occurred even when it was raised up to.
The laminate 10 according to the present invention obtained by the above production method, and the bag produced by the same production method as in Example 1 can be used to form a beautiful printed pattern. It was excellent in appearance, hygiene, interlayer strength, barrier properties and the like.
[0045]
(Example 4)
In the laminating apparatus shown in FIG. 4, the uneven rubber roll shown in FIG. 8 is set, and the same material and manufacturing method as the reinforcing materials 51 and 52 and the heat-sealable tube T used in Example 1 are laminated according to the present invention. A body 10 was produced.
In addition, although the uneven rubber roll shown in FIG. 8 depends on the width of the original fabric of the laminate 10, a roll that forms the circular recesses (cells) shown in FIG. did.
Further, even if the laminated sheet obtained in the first step is bonded in the same winding direction in the second step without being reversely wound, generation of wrinkles is suppressed, and the roll rotation speed of the winding is increased from 40 m / min to 100 m / min. No wrinkles occurred even when it was raised up to.
The laminate 10 according to the present invention obtained by the above production method, and the bag produced by the same production method as in Example 1 can be used to form a beautiful printed pattern. It was excellent in appearance, hygiene, interlayer strength, barrier properties and the like.
[0046]
(Comparative Example 1)
In the laminating apparatus shown in FIG. 4, a conventional smooth rubber roll is set, and the laminate 10 according to the present invention is manufactured using the same material and manufacturing method as the reinforcing members 51 and 52 and the heat-sealable tube T used in Example 1. Manufactured.
The laminate 10 of Comparative Example 1 obtained by the above production method was wound at a roll rotation speed of 40 m / min. As a result, the heat-sealable tube T before passing through the uneven roll and the smooth roll was wound. As air accumulated inside, wrinkles occurred on the bonded surfaces.
In addition, since a part of the reinforcing material floats from the outer surface of the tubular film at the heel portion, the interlayer strength of the bonded surface is weakened, and an air passage is formed on the bonded surface.
In the part where the wrinkles occurred, the barrier function of the reinforcing material could not be sufficiently exhibited, there was a part with a bad appearance, and there was a part with weak interlayer strength, which was not preferable.
[0047]
【The invention's effect】
As is apparent from the above description, the present invention includes laminating and laminating the outer surface of a tubular film having heat sealing properties and a reinforcing material having a higher heat softening temperature than the tubular film via an adhesive layer. A method for producing a laminate, characterized in that the tubular film and the reinforcement Material Between the smooth roll and the concavo-convex roll, and the laminate is bonded and laminated in a state where the air in the cylindrical film is held in the roll recess while being dispersed, and the appearance is free from wrinkles. Can be manufactured with good yield, and by using this, the periphery is heat-sealed with a desired size, and the contents are parts of precision equipment such as mechanical parts and electronic parts. When a bag body is produced by storing or filling various solids such as experimental samples in space, foods and drinks, Ringer's solution, blood transfusions, and other various solids, liquids and viscous articles, etc. A bag that can be distributed on the inner surface of the body without contaminating with microorganisms or foreign matters, is hygienic, has no wrinkles, can form a beautiful printed pattern on the surface, and has excellent appearance, barrier properties, etc. Can provide It is kill things.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of a laminate of the present invention.
FIG. 2 is a schematic view of a bag according to the present invention.
FIG. 3 is a schematic view showing an arrangement when the present invention is made in a single row.
FIG. 4 is a schematic view showing an example of a laminating apparatus (single type).
5 is a schematic front view showing an example of a concavo-convex roll used in the laminating apparatus of FIGS. 4 and 14. FIG.
6 is a schematic front view showing an example of a concavo-convex roll used in the laminating apparatus shown in FIGS. 4 and 14. FIG.
7 is a schematic front view showing an example of an uneven roll used in the laminating apparatus shown in FIGS. 4 and 14. FIG.
8 is a schematic front view showing an example of a concavo-convex roll used in the laminating apparatus of FIGS. 4 and 14. FIG.
9 is a schematic front view showing an example of a concavo-convex roll used in the laminating apparatus of FIGS. 4 and 14. FIG.
FIG. 10 is an enlarged view showing an example of a pattern on the surface of an uneven roll.
FIG. 11 is an enlarged view showing an example of a pattern on the surface of an uneven roll.
FIG. 12 is a schematic cross-sectional view showing an example of the surface shape of an uneven roll.
FIG. 13 is a schematic cross-sectional view showing an example of the surface shape of an uneven roll.
FIG. 14 is a schematic view showing a laminating apparatus (tandem type).
[Explanation of symbols]
1 Base film
2 Pattern printing layer
3, 31 Adhesive layer
4 Barrier layer
10 Laminate
11 Laminated sheet
5, 51, 52 Reinforcing material
6 Heat seal part
61 Bottom seal
7,76 Cutting position
8 opening
9 Heat seal layer
T heat sealable tube
F Flow direction
100 Laminating device (single type)
100 'laminating device (tandem type)
101 First paper feed
102 Second paper feed
103 Third paper feed
105 Winding part
106,107 T dice
121, 122 Primer application part
131, 133 Concavity and convexity roller (rubber roller)
132, 134 Smooth roller (cooling roller)

Claims (3)

A laminate manufacturing method comprising laminating and laminating an outer surface of a tubular film having heat sealing properties and a reinforcing material having a higher heat softening temperature than the tubular film through an adhesive layer, The tubular film and the reinforcing material are passed between a smooth roll and a concavo-convex roll, bonded and laminated in a state where air in the tubular film is held in the roll recess while being dispersed, and the above-mentioned adhesion A method for producing a laminate, wherein the layer comprises a melt-extruded resin layer, and is laminated by extrusion lamination between the reinforcing material and the tubular film via the melt-extruded resin layer. The method for producing a laminated body according to claim 1, wherein the concave-convex roll forms a single or a plurality of grooves extending in a spiral shape from the central portion of the body surface of the roll to both ends. The method for producing a laminate according to any one of claims 1 to 2, wherein a width of the uneven roll is shorter than a width of an original fabric of the cylindrical film.

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