JP3898265B2 - Laminated body and method of manufacturing bag body using the same - Google Patents

Description

【００３１】
【発明の効果】
本発明の積層体は、前述のように、濾過空気でブロー製膜したチューブの両面に補強層を積層したものであり、そのチューブ内は大気に晒されたり、加工機のロールと接触することがなく最終工程で内面ヒートシール層とし袋体となる。
本発明における積層体及びそれを用いて製造した袋体のヒートシール層は、異物特に生物的に汚染された粉塵などが存在しない。
そして、補強層により強度を付加されるばかりでなく、基材フィルムの裏面に設けた印刷をフィルムを通して光沢がある絵柄層として認識し、またバリア性をもつ積層体とそれを用いた袋体とを提供できる効果を奏する。
【図面の簡単な説明】
【図１】本発明の積層体の断面概略図である。
【図２】本発明の袋体の模式図である。
【図３】本発明を多列で加工した場合の積層体の断面概略図である。
【図４】本発明を多列で製袋した場合の配置を示す模式図である。
【符号の説明】
１ 基材フィルム
２ 絵柄層
３、３１ 接着層
４ バリア層
５、５１、５２ 補強層
６、６０、６０Ａ、６０Ｂ、６６ ヒートシール部
６１、６２、６３ ボトムシール部
７、７２、７６、７７、７８ 断裁位置
８、８１、８２ 開口部
Ｔ ＨＳ性チューブ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a laminate composed of a film mainly composed of a plastic film, and the inner surface of the bag formed from the film is free from microbial contamination and foreign matter, and the production of the laminate and the bag using the laminate. Belongs to the method.
[0002]
[Prior art]
Composite films mainly made of plastic are each formed as a single layer, and can be printed, coated with a barrier material or heat-sealable material, or laminated with a film with this performance, as desired. A laminate having a general function has been manufactured.
These single-layer films, laminated films or coated layers always have a chance to be exposed to the atmosphere at the work place where the lamination process is performed, and in the bag making process, bacteria and In addition to airborne dust, there was a fatal problem that insects and insects and foreign substances adhered to the inside of the bag, and in some cases, the inside of the bag (the surface filled with pharmaceuticals, foods, etc.).
[0003]
In order to prevent such foreign matter from adhering, clean air is removed from the inside of the workplace, and films and other materials used for processing are transported in a packaged state and unpacked in the front chamber. Processing in a so-called clean room has been performed, for example, being carried into a work place for processing.
However, the laminated film used for packaging is made of various materials, and there are many manufacturers. The film and paper used for processing are cut, and people and materials are brought in and out. In fact, it is not an exaggeration to say that it is extremely difficult from the viewpoint of cost / efficiency to establish a workplace where the presence of dust and microorganisms (insects) is absolutely eliminated and that no foreign matter adheres to the laminate.
[0004]
The inner surface of the bag body to be heat-sealed is not exposed to the outside air during film formation or after film formation, and there is a plastic tube as a bag body that is filled with contents and heat-sealed. However, the material applied to the plastic tube is limited, and examples thereof include polyethylene resin, polypropylene, and a co-extruded two-layer tube of polyethylene and nylon. With such a configuration, it is not possible to satisfy the advanced physical properties required for the packaging material. The pattern layer is also limited to the surface printing of the tube, and there is a problem that it is impossible to provide a bag having a beautiful pattern layer as seen in the back side printing of a plastic film.
[0005]
[Problems to be solved by the invention]
In order to prevent the adhesion of foreign substances generated in the manufacturing process found in conventional laminates for packaging, the present invention does not expose films and intermediate processed products to the atmosphere or contact with rolls of processing machines. Furthermore, it is an object to provide a laminate having a beautiful pattern layer, which can be seen on the back side of a plastic film, and a manufacturing method of the bag using the same, which eliminates foreign matters, particularly biological contamination, at least inside the bag body. It is what.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, the laminate of the present invention has a heat softening temperature on the outer surface of a tubular film having heat sealability (hereinafter referred to as an HS tube) in comparison with the tubular film. Is a laminate provided with a high reinforcing layer.
And it is the laminated body in which the barrier layer was provided in said reinforcement layer at least.
Moreover, said barrier layer is a laminated body which consists of 1 type (s) or 2 or more types of an aluminum foil, a polyvinylidene chloride coating film, a vapor deposition film, the film of polyvinyl alcohol, or ethylene-vinyl acetate copolymer saponified material.
And it is the manufacturing method of the bag body which heat-seals and forms the above-mentioned laminated body in the cylindrical shape with a desired size.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, as shown in FIG. 1, the reinforcing layer 5 (51 and 52) having a softening temperature higher than that of the HS tube is laminated on the outer surface of the HS tube T which has been flattened through an adhesive layer 31. It is the laminated body 10 which was made. The reinforcing layer 5 is formed by providing the base film 1 with the picture layer 2 as required and laminating the adhesive layer 3 with one or more barrier layers 4.
[0008]
When an oxygen gas barrier including a light barrier is required, the barrier layer 4 of the present invention is a metal aluminum vapor deposition film (partial vapor deposition is applied to an aluminum foil, for example, a biaxially stretched polyethylene terephthalate film or a biaxially stretched polypropylene film). Can be used. When a transparent oxygen gas barrier is required, attach a film deposited with silicon oxide or metal oxide, a film coated with polyvinylidene chloride or polyvinyl alcohol, or a film of saponified ethylene / vinyl acetate copolymer. Laminate and configure via layer 3.
And when a water vapor | steam barrier is requested | required, the film of polyolefin resin used as a heat sealant layer can utilize the function. However, when more excellent performance is required, the above-described light barrier film, or a film on which silicon oxide or metal oxide is vapor-deposited or coated with polyvinylidene chloride can be laminated and constituted.
[0009]
The HS tube T of the present invention forms a polyolefin-based resin such as polyethylene by a normal inflation method (blow tube) using a circular die, but the blowing gas (air) filters fine particles of 0.5 μm or less. And filtered to use. Furthermore, the use of an inert gas such as nitrogen gas or carbon dioxide gas as a gas has the preferable effect of suppressing the generation of solids such as resin oxides in the die and reducing the fine particles of smoke in the HS tube. is there.
[0010]
HS tube is made of polyethylene, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / acrylic acid ester copolymer, ionomer, saponified ethylene / vinyl acetate copolymer, nylon, polypropylene, etc. Not only layer tubes but also these co-extruded multilayer tubes can be used.
[0011]
The reinforcing layer of the present invention can be composed of a single layer or a multilayer. In the case of a single layer configuration, it may be used as a printing substrate, and may also serve as the barrier layer. The reinforcing layer having a multilayer structure is formed by providing a pattern layer on a base film having strength as required, and further laminating and configuring one or more barrier layers via an adhesive layer.
[0012]
The base film used for the reinforcing layer having a multilayer structure has a softening temperature higher than that of the HS tube such as polypropylene, polyethylene terephthalate, polyamide (6 nylon, 6, 6 nylon), cellulose acetate, saponified ethylene / vinyl acetate copolymer. Examples thereof include a stretched or unstretched plastic film, paper, and aluminum foil.
[0013]
The lamination of the reinforcing layer is performed by wet lamination, dry lamination (lacquer lamination, non-solation lamination) using a conventional adhesive layer, and sandwich lamination (polyethylene lamination, polylamination, thermoplastic adhesive layer). Extrusion laminating).
[0014]
In the case of an ethylene / vinyl acetate copolymer having a low softening temperature of the HS tube, dry lamination which can be processed at a relatively low temperature is preferable. However, the residual gas contained in the HS tube may be squeezed and accumulated in the laminate roll part. In order to prevent this, it is preferable that the end of the HS tube is cut at any time and periodically deaerated and laminated.
[0015]
When entraining air bubbles without deaeration between the HS tube and the reinforcing layer, it is preferable to laminate the adhesive layer by sandwich lamination using a molten resin rather than dry lamination. At this time, since heat fusion may occur inside the HS tube at the melting temperature of the adhesive layer, the resin used for the adhesive layer may be a low-density polyethylene or ethylene / vinyl acetate copolymer having a relatively low thermal melting temperature. Polymers, ethylene / acrylic acid copolymers, ethylene / acrylic acid ester copolymers, ionomers and the like are used. In order to lower the bonding temperature (processing temperature), it is desirable to perform ozone gas treatment on the molten resin.
[0016]
Low-melting point ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / acrylic acid ester copolymer on the side of the reinforcing layer that adheres to the HS tube and polyolefin resin (barrier layer of the reinforcing layer) There is also a method in which an ionomer is further provided for sandwich lamination.
By providing these low melting point resin layers, it is possible to lower the processing temperature of the resin used for sandwich lamination and to prevent heat fusion inside the HS tube.
[0017]
As shown in FIG. 1, the laminate 10 configured as described above has the same configuration of the reinforcing layer 51 and the reinforcing layer 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.
[0018]
As shown in FIG. 1, the bag body using the laminated body 10 of the present invention is provided with a cutting position 7 at an end portion thereof and heat-sealed in the film processing direction by the heat seal portion 6. Furthermore, as shown in FIG. 2, in the cross direction, the laminated body can be cut at the cutting position 76 at the same time as heat sealing by the heat sealing portion 60, thereby forming a bag body having the bottom seal portion 61 and the opening 8. The cutting position 76 is provided at a position slightly (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 76 .
[0019]
Further, as shown in FIG. 4, the laminate 10 of the present invention has a heat seal portion 66 and a heat seal portion 66 in the center of the laminate, in addition to the heat seal portion 6 and the edge cutting position 7 provided in the processing direction of the laminate. A cutting position 72 is provided to allow multi-row processing.
In the cross direction, heat sealing is performed by the heat sealing portion 60 provided with the cutting position 77 in the center. Further, the bottom seal portions 62 and 63 can be formed by cutting at the cutting position 77. Alternatively, the openings 81 and 82 can be formed by cutting at a cutting position 78 provided at the center of the heat seal portion 60A and the heat seal portion 60B that is subsequently heat sealed.
Of course, it goes without saying that the heat seal portions 66 and the cutting positions 72 provided in the processing direction of the laminated body are increased so that more rows can be processed.
[0020]
In the laminated body 10 formed as described above, the heat seal surface serving as the inner surface is not exposed to the outside air from the time of forming the HS tube until the bag making is completed. And the reinforcement | strengthening layer 5 which laminated | stacked the pattern layer 2 by printing etc. and the barrier layer 4 on the outer surface of a tube state was provided. Therefore, there is no secondary contamination on the heat seal surface due to foreign matters flying from the outside. Furthermore, the bag body in which the periphery of the laminate is heat sealed and the opening is provided is not exposed to the outside air until the contents are filled. Therefore , by filling the bag body of the present invention in a clean room, it is hygienic without at least biological contamination, apart from fine particles such as smoke generated by the film forming machine.
[0021]
Hereinafter, details of the present invention will be further described with reference to examples.
Example 1
As shown in FIG. 1, a surface of a biaxially stretched nylon film (base film 1) having a thickness of 15 μm provided with a pattern layer 2 by gravure printing and an aluminum foil (barrier layer 4) having a thickness of 9 μm are made of polyethyleneimine. Through the primer layer, low-density polyethylene (adhesive layer 3) was melt-extruded and sandwich-laminated with a coater to form a reinforcing layer 51 and a reinforcing layer 52 having the same configuration.
On the other hand, a polyethylene tube (HS tube T) having a thickness of 20 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 was produced.
[0022]
Then, the barrier layer 4 side of the reinforcing layer 51 and one side of the HS tube T were laminated by sandwich lamination with low-density polyethylene (adhesive layer 31) through a polyester-isocyanate primer layer.
Subsequently, the laminated body 10 of the present invention was configured by sandwiching the barrier layer 4 side of the reinforcing layer 52 and the other side of the HS tube T in the same manner as described above. The sandwich lamination was performed at a processing temperature of 260 ° C. by applying ozone gas to low density polyethylene (adhesive layer 31).
[0023]
Next, the laminated body 10 is attached to the bag making machine, and as shown in FIG. Further, as shown in FIG. 2, a heat seal portion 60 that forms a bottom seal of the bag body is formed and cut at a cutting position 76 provided 0.5 mm from the heat seal portion to provide (bottom seal portion 61). At the same time, an opening 8 was provided to produce a 300 mm × 200 mm bag of the present invention.
[0024]
(Example 2)
The base film 1 of Example 1 is replaced with a biaxially stretched polyester film having a thickness of 12 μm, and the barrier layer 4 is replaced with a laminated film of an aluminum oxide-deposited polyester film and a biaxially stretched nylon film having a thickness of 25 μm. These layers were dry-laminated using a polyester / isocyanate-based adhesive layer 3 to form a reinforcing layer 51 and a reinforcing layer 52 having the same configuration.
On the other hand, an HS tube T having a thickness of 40 μm, which has been subjected to double-sided corona discharge treatment, is blown with nitrogen gas obtained by filtering linear low-density polyethylene containing an antistatic agent through a 0.5 μm filter. did.
[0025]
Then, the side of the barrier layer 4 of the reinforcing layers 51 and 52 and the polyester / isocyanate-based adhesive layer 31 are provided, and one side of the HS tube T and the reinforcing layer 51 are provided, and the reinforcing layer is provided on the other side. 52 was dry-laminated to form a laminate 10 of the present invention.
[0026]
Subsequently, the laminated body 10 is attached to a bag making machine, and heat seal portions 6 and 66 are provided at both ends and a center portion as shown in FIG. 3 and cut at cutting positions 7 and 72. Further, as shown in FIG. 4, a heat seal portion 60 that forms a bottom seal of the bag body is formed and divided into two at a cutting position 77 located at the center of the heat seal portion 60 to form (bottom seal portions 62 and 63). To do. In addition, the bags of the present invention having openings 81 and 82 cut in two rows by cutting at a cutting position 78 corresponding to the middle between the heat seal portion 60A and the next heat seal portion 60B that are intermittently repeated in the processing direction. Produced.
[0027]
(Comparative Example 1) A commercially available polyethylene film having a thickness of 20 μm produced while being exposed in the air to the aluminum foil (barrier layer) 4 of the reinforcing layer 5 produced in Example 1 by using a normal inflation method, and a low-density polyethylene ( Adhesive layer) was used for sandwich lamination. Then, to create the same bag as in Example 1 the polyethylene film as a heat seal layer.
[0028]
(Comparative Example 2)
A laminate in which a low-density polyethylene layer having a thickness of 40 μm was provided on the aluminum foil (barrier layer) 4 of the reinforcing layer 5 produced in Example 1 by a melt extrusion coating method was formed. And the bag body similar to Example 1 was produced by making a polyethylene layer into a heat seal layer.
[0029]
100 ml of clean water is sealed in each bag body of Examples and Comparative Examples in a clean room, and after shaking for 10 minutes, the number of particles contained in the water that is opened and taken out is counted with a particle counter (Lyon Co., Ltd.). Table 1 shows the number of units converted to a unit area (pieces / cm ² ).
[0030]
[Table 1]

[0031]
【The invention's effect】
As described above, the laminate of the present invention is obtained by laminating reinforcing layers on both surfaces of a tube blown with filtered air, and the inside of the tube is exposed to the atmosphere or is in contact with a roll of a processing machine. In the final process, it becomes a bag body as an internal heat seal layer.
The heat-seal layer of the laminate and the bag produced using the laminate in the present invention is free from foreign matters, particularly biologically contaminated dust.
And not only the strength is added by the reinforcing layer, but the printing provided on the back surface of the base film is recognized as a glossy pattern layer through the film, and a laminate having a barrier property and a bag body using the same The effect that can be provided.
[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 cross-sectional view of a laminate when the present invention is processed in multiple rows.
FIG. 4 is a schematic diagram showing an arrangement when the present invention is made in multiple rows.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Base film 2 Picture layer 3, 31 Adhesion layer 4 Barrier layer 5, 51, 52 Reinforcement layer 6, 60, 60A, 60B, 66 Heat seal part 61, 62, 63 Bottom seal part 7, 72, 76, 77, 78 Cutting position 8, 81, 82 Opening T HS tube

Claims (7)

  Using a blow gas obtained by filtering and removing fine particles with a filter, a step of producing a heat-sealable tube with an inner surface having heat-sealability by an inflation method;
  Crushing the heat-sealable tube into a flat shape so that the inner surface is not exposed to outside air;
  On both outer surfaces of the crushed heat-sealable tube, a reinforcing layer having a softening temperature higher than that of the heat-sealable tube, at a temperature at which the inner surface of the heat-sealable tube is not thermally fused, low density polyethylene, ethylene Adhering via vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / acrylic acid ester copolymer, or ionomer to form a laminate;
  Parallel to the processing direction of the laminate, heat sealing the inside of the heat-sealable tube at both ends of the laminate, and forming a heat seal portion;
  Heat-sealing the inside of the heat-sealable tube in the cross direction to form a bottom seal part
The manufacturing method of the bag characterized by comprising.   The method further comprises the step of laminating a base film having a softening temperature higher than that of the heat-sealable tube and a barrier layer that barriers oxygen gas through an adhesive layer to form the reinforcing layer. The manufacturing method of the bag body of 1.   Providing a pattern layer on a base film having a higher softening temperature than the heat-sealable tube;
  The bag manufacturing method according to claim 1, further comprising a step of laminating the pattern layer and a barrier layer that blocks oxygen gas through an adhesive layer to form the reinforcing layer.   2. The method of claim 1, further comprising the step of laminating a base film having a softening temperature higher than that of the heat-sealable tube and a barrier layer that blocks water vapor through an adhesive layer to form the reinforcing layer. The manufacturing method of the bag body as described in any one of.   5. The method according to claim 1, further comprising a step of heat-sealing the inside of the heat-sealable tube at a central portion of the laminated body in parallel with a processing direction of the laminated body. Manufacturing method for the bag.   The said heat-sealable tube consists of polyethylene, The manufacturing method of the bag body of any one of Claim 1 thru | or 5 characterized by the above-mentioned.   Using blow gas from which fine particles have been filtered off with a filter, a heat-sealable tube whose inner surface has heat-sealability is produced by the inflation method.
  Crush the heat-sealable tube into a flat shape so that the inner surface is not exposed to the outside air,
  On both outer surfaces of the crushed heat-sealable tube, a reinforcing layer having a softening temperature higher than that of the heat-sealable tube, at a temperature at which the inner surface of the heat-sealable tube is not thermally fused, low density polyethylene, ethylene Bonding via vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / acrylic acid ester copolymer, or ionomer to form a laminate,
  The inside of the heat-sealable tube is heat-sealed at both end portions of the laminate in parallel with the processing direction of the laminate.
A laminated body produced by manufacturing as described above.

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