JP3807176B2 - Barrier packaging material and packaging bag using the same - Google Patents

Description

【００３０】
本発明のインフレーションフィルムとバリア性フィルムをサンドラミネートすることを特徴として得られる包装袋により、内面は製品包装時まで外気に触れない為ゴミ等の付着がない。また、インフレーションフィルムを使用したため、押し出しフィルムに較べ成膜温度（樹脂の溶融温度）が低いため、フィルム劣化による低分子成分の溶出が少ない。更に、請求項２の発明は、接着剤，アンカーコート剤を使用せず、サンドラミネートしたため、該成分に由来する化学物質の溶出もない。この様な内表面のきれいな包装袋が得られたことにより、ハードディスクなどの既存のクリーン度の要求される包材はもちろん、よりクリーン度が要求される包材としての利用が可能となった。
【図面の簡単な説明】
【図１】本発明のバリア性包装資材の構成断面図であり、（ａ）は片面に、（ｂ）は両面にバリア性フィルムを貼り合わせ積層した図である。
【図２】本発明のバリア性包装資材を用いて製袋する場合の説明図であり、（ａ）は構成断面図であり、（ｂ）は袋の斜視図である。
【図３】本発明の他のバリア性包装資材を用いて製袋する場合の説明図であり、（ａ）は構成断面図であり、（ｂ）は袋の斜視図である。
【図４】本発明のバリア性包装資材の作製をする方法を説明する概略図である。
【図５】フィルム形状を示す斜視図であり、（ａ）はチューブ状フィルム、（ｂ）は帯状フィルム、（ｃ）はバリア性包装資材フィルムを示す。
【符号の説明】
１…射出機
２…円形ダイ
３…チューブ状フィルム
４…ピンチローラ
５…帯状フィルム
６…接着性樹脂
７…プレスローラ
８…バリア性フィルム
９、１０、２０…バリア性包装資材
１１…チューブ状フィルム
１２…接着性樹脂
１３…バリア性フィルム
１４…熱融着部
３０…袋[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to packaging of electronic parts that do not like adhesion of dust, metal ions, halogen ions, and other chemical substances such as hard disks, semiconductors, etc., and packaging for medical drugs such as infusion solutions, drug solutions, and injection needles. More specifically, there is no elution of dust and chemical substances from the film layer that touches the contents and products, no elution of contents such as passing through the wall surface of the packaging bag, or gas barrier properties such as blocking oxygen from the outside air. It relates to excellent packaging bags.
[0002]
[Prior art]
In order to suppress the adhesion of dust to the sealant surface in contact with the product, a method of preparing the surrounding environment for making the packaging material, such as manufacturing a packaging bag in a clean room, is generally used.
Further, there is also used a method in which a further easily peelable layer is provided on the inner surface of the sealant and peeled immediately before use.
Furthermore, when the adhesive film and the anchor coat agent are used when laminating the sealant film in contact with the product and the outer film having gas barrier properties, the component may permeate the sealant film and elute on the inner surface. A method of extruding an inner surface sealant film at a high temperature and directly laminating the outer surface film without using an adhesive or an anchor coating agent is used.
[0003]
[Problems to be solved by the invention]
Although the method of preparing the surrounding environment for making packaging materials is excellent in that it does not bring in trash that may cause it from the beginning, environmental management is necessary, and even when processing products that are not so severe, such as trash attachment There are various problems such as the need to be careful not to pollute the environment.
In addition, the method of further peeling immediately before use does not require much environmental management, and it is excellent in that it can easily remove things attached during transportation, but the method of disposing of peeled film such as peeled film becomes garbage Is a problem.
[0004]
Furthermore, in the direct lamination method, the sealant film is extruded at a high temperature, and the surface is oxidized and deteriorated to improve the adhesion with the barrier film. Therefore, the elution of low molecular components due to the deterioration of the sealant film becomes a problem. .
[0005]
[Means for Solving the Problems]
The problem was solved by laminating and laminating a barrier film on the outer surface of a film processed by a tube-like inflation method with a guaranteed cleanness of the inner surface and cutting in the final step of bag making.
That is, the inner surface sealant is formed into a tube-like film by an inflation method using clean air, the air on the inner surface of the tube-like film is evacuated, and the inner surface of the film is brought into close contact with each other to form a strip shape. A barrier film is bonded and laminated to the belt-like double-sided or single-sided outer surface using an adhesive resin such as a polyethylene resin to obtain a packaging material.
[0006]
The packaging material is made into a bag without peeling the film on the inner surface that is in close contact, cut into an appropriate size, and used as a packaging bag.
The innermost surface that the packaging bag is in close contact with is not kept in contact with the outside air after inflation molding, so that the cleanness is maintained. At the time of use, the adhesion portion is peeled off, and the product is put in between.
[0007]
The present invention of claim 1 has been made based on the above technical idea, the outer surface of the tubular film which were processed by inflation method, the width is greater than the barrier film layer of the tubular film, adhesive resin Is a barrier packaging material characterized in that it is melt-extruded between the two and laminated and laminated by sand lamination, and a tubular film is wrapped with a barrier film .
[0010]
Further, according to the invention described in claim 2, when stacking processed stuck in the sand lamination, adhesives, barrier packaging of claim 1, characterized in that as a laminate bonding without using the anchor coating agent It is a material.
[0011]
The invention according to claim 3 is a packaging bag made using the barrier packaging material according to any one of claim 1 or claim 2 , and the invention according to claim 4 When producing using the said barrier packaging material, after making a bag, it cuts in the last process, It is a packaging bag of Claim 3 characterized by the above-mentioned.
[0012]
As a feature of the present invention, first of all, a process after forming the belt-like film by removing the air from the inner surface of the tube-like inflation film formed by using clean air, that is, the present invention, This is to prevent the adhered part from being peeled off until the product is wrapped in a packaging bag having a clean inner surface and excellent barrier properties.
As a result, the inner surface does not come into contact with the outside air, so there is no adhesion of dirt or the like and no contamination. In addition, since an inflation film is used, since it is lower than the film formation temperature (melting temperature of the resin) at the time of direct lamination to the extruded film or barrier film, there is little mischievous resin degradation.
Furthermore, since a small amount of additives such as a high-temperature processing stabilizer can be used, it is more preferable.
[0013]
A second feature is that a sand laminating method is used when a barrier film is bonded to a belt-like sealant film. By using the sand laminating method, no adhesive or undercoat agent is used, so the low-molecular components such as residual solvents, adhesive components, and other additives are eluted to the inner surface through the inner sealant film. Since there is no, cleanliness can be maintained.
[0014]
As a third feature, when a barrier film is bonded to a belt-like sealant film, it can be bonded to both sides or one side of the outer surface, and when bonded to both sides of the outer surface, as a double-sided packaging bag, The material can be used effectively because it can be used.
[0015]
As a fourth feature, the width of the barrier film is larger than the width of the inflation film to be bonded by the sand laminating method, and when the barrier film is bonded to both sides of the outer surface of the belt-like inflation film, the barrier films are In close contact. Thereby, the stable barrier property can be provided.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, it will be described in detail with reference to the drawings.
FIG. 4 shows an example of an apparatus for producing a barrier packaging material by producing a tubular film by inflation and then laminating and laminating a barrier film, and FIG. 5 is a schematic diagram for explaining the film shape.
The blown film used as the innermost sealant film is processed into a tubular film (3) by injecting resin from the injection machine (1), inflating it with a circular die (2), and using a pinch roller (4). Air is removed from the inner surface and the inner surfaces are brought into close contact with each other to form a belt-like film (5). Thereafter, the barrier packaging material (9) is obtained by sand lamination in which the belt-like film (5) and the barrier film (7) are melt-injected from the T die with the adhesive resin (6) and sandwiched between the press rollers (8). .
[0017]
Here, if a barrier material is to be obtained mainly for the purpose of preventing dust adhesion, an inflation film and a barrier film are laminated together by a dry laminating method using a polyether urethane two-component curable adhesive. Barrier packaging materials may be manufactured.
In addition, in order to bond and laminate the barrier film on both surfaces, the bonding may be repeated once again on the other surface.
[0018]
There is no restriction | limiting in particular in the kind of inflation film used as an innermost sealant film, and it changes with the required quality of the product to package.
For packaging materials that require non-extraction of chemical components such as volatile components, low molecular components, and metal ions, low density polyethylene that is thermally stable and has few additives is used. In addition, linear low density polyethylene or the like is used as long as the packaging material requires sealing properties and flexibility. Furthermore, these additives may be added if there is a demand for antistatic effects, slip properties, and the like. However, it is preferable to use an additive-free low density polyethylene in terms of cleanliness.
[0019]
The conditions for forming an inflation film include blowing clean air so as not to contaminate the inner surface of the tube, and shortening the residence time so as not to deteriorate the resin. There is no problem with the film conditions.
[0020]
The resin used for the sand lamination is not particularly limited as long as it can be adhered to and bonded to the inflation film and the barrier film, and the requirements for adhesion differ depending on polyethylene, polypropylene, ethylene methacrylic acid copolymer, methylene methyl acrylate copolymer. Polymers, ethylene vinyl acetate copolymers, modified maleic acid copolymers and the like are used. Preferably, polyethylene is used for the reason that there is no decomposition of acid components and the like.
The conditions for sand laminating may be general sand lamination conditions, and may be subjected to surface modification treatment such as ozone treatment or corona discharge treatment if necessary.
[0021]
The barrier film is not particularly limited as long as it can be bonded to the sealant film with a polyethylene resin or an adhesive resin. Generally, resins having excellent barrier properties, saponified ethylene vinyl acetate copolymer (EVOH), polymetaxylylene adipamide (MXNy), polyamide (PA), polyethylene terephthalate (PET), polyethylene naphthalate (PEN) A film obtained by extruding metal, a film on which a metal or an inorganic compound is deposited, and the like can be raised. Aluminum foil is preferably used in terms of excellent gas barrier properties, light shielding properties, and the like.
Depending on the requirements of the product to be wrapped, a film, paper or the like may be further laminated on the outer surface of the barrier film.
Further, in order to increase the activity of the surface to be laminated, corona treatment, flame treatment, plasma treatment or the like may be performed.
[0022]
FIG. 1 shows a cross-sectional configuration diagram of the barrier packaging material manufactured in this way. FIG. 1A shows a barrier in which a barrier film (13) is laminated via an adhesive resin layer (12) on one side of a belt-like film in which the inner surface of a tubular film (11) is evacuated and the inner surface of the film is adhered. 1 (b) shows a barrier packaging material (20) in which a barrier film is laminated on both sides.
[0023]
FIG. 2 and FIG. 3 are diagrams for explaining the case of bag making using this barrier packaging material.
FIG. 2 shows the case where a barrier film is provided on both sides of a tubular film, and the barrier film is not completely covered with the barrier film and the barrier film is not completely wrapped with the barrier film. When making a bag, or when making a bag with a width smaller than the width of the tube-shaped film, that is, when making a bag by performing three-side sealing, the tube-shaped film (11) which is a sealant layer that becomes the periphery of the bag These three sides are heat-sealed to form the heat-sealed portion (14), and then the bag (30) can be produced by cutting outside the heat-sealed portion (XX line portion).
[0024]
Fig. 3 shows that the width of the barrier film is larger than the width of the tubular film, and the width is the same size as the tubular film using a barrier packaging material in which the barrier film completely encloses the tubular film. In other words, the tube-shaped film cylinder is the lateral part of the bag, so the lateral part does not need to be heat-sealed and can be made by sealing only the bottom part, and only the bottom part is thermally fused. After making it adhere | attach, the outer side (YY line part) of a fused part is cut, and a bag (30) can be produced.
[0025]
【Example】
<Example 1>
An additive-free low-density polyethylene resin (MI = 0.8) was formed into a film with a thickness of 40 μm by an inflation method. At this time, extrusion was performed at a resin temperature of 170 ° C., and air with high cleanliness was blown as the air to be blown. The obtained tube-shaped film was woven on the line, and a band-like sealant film having an inner surface layer closely adhered was obtained without cutting off the ears. The film was folded in a two-layered strip shape and had a width of 60 cm.
An Al surface of a PET / Al film having a width of 64 cm made of PET and aluminum foil (Al) was bonded to one of the outer surfaces of the sealant film by a sand lamination method. Low density polyethylene (MI = 8) was used as the resin for sand lamination, and the resin was laminated at a resin temperature of 315 ° C.
Also, the other surface was sand laminated with a PET / Al film having a width of 64 cm in the same manner. A film having a width of 64 cm obtained by sand-laminating the barrier film was sealed and cut to obtain a bag having only a bottom seal having a width of 64 × length of 60.
As described above, a barrier bag with a high cleanliness was obtained. Table 1 shows the results of measuring the particles in the bag.
[0026]
<Example 2>
An additive-free linear low density polyethylene resin (MI = 1.0) was formed to a thickness of 50 μm by an inflation method. At this time, extrusion was performed at a resin temperature of 160 ° C., and air with high cleanliness was blown as the air to be blown. The obtained tube-shaped film was folded on a line to obtain a strip-shaped sealant film in which the inner layer was adhered without cutting off the ears. The film was folded in a two-layered strip shape and had a width of 60 cm.
A film having a width of 64 cm obtained by vapor-depositing silica on PET was bonded to one of the outer surfaces of the sealant film by a sand laminating method. Linear low-density polyethylene (MI = 20, density = 0.89) was used as the resin for sand lamination, and lamination was performed at a resin temperature of 300 ° C.
In addition, a silica-deposited PET film having a width of 64 cm was sand laminated on the other surface in the same manner. A film having a width of 64 cm obtained by sand-laminating the barrier film was sealed and cut to obtain a bag having only a bottom seal having a width of 64 × length of 60.
As described above, a barrier bag with a high cleanliness was obtained. Table 1 shows the results of measuring the particles in the bag.
[0027]
< Reference Example 1 >
An additive-free low-density polyethylene resin (MI = 0.8) was formed into a film with a thickness of 40 μm by an inflation method. At this time, extrusion was performed at a resin temperature of 170 ° C., and air with high cleanliness was blown as the air to be blown. The obtained tube-shaped film was folded on a line to obtain a strip-shaped sealant film in which the inner layer was adhered without cutting off the ears. The film was folded in a two-layered strip shape and had a width of 60 cm. One side of the outer surface of the sealant film was coated with a urethane adhesive on the Al surface of a PET / Al film made of PET and Al having a width of 64 cm and bonded together by dry lamination. Further, the other surface was dry laminated with a PET / Al film having a width of 64 cm in the same manner. A film having a width of 64 cm obtained by dry laminating the barrier film was aged at 50 ° C. for 2 days, and then bottom sealed and cut to obtain a bag having only a bottom seal having a width of 64 × length of 60. As described above, a barrier bag with a high cleanliness was obtained. Table 1 shows the results of measuring the particles in the bag.
[0028]
< Reference Example 2 >
An additive-free linear low density polyethylene resin (MI = 1.0) was formed to a thickness of 50 μm by an inflation method. At this time, extrusion was performed at a resin temperature of 160 ° C., and air with high cleanliness was blown as the air to be blown. The obtained tube-shaped film was woven on the line, and a band-like sealant film having an inner surface layer closely adhered was obtained without cutting off the ears. The film was woven in a two-layered strip shape and had a width of 60 cm. A film having a width of 64 cm obtained by vapor-depositing silica on PET was bonded to one of the outer surfaces of the sealant film by a dry laminating method. In addition, a 64 cm wide silica-deposited PET film was dry laminated on the other surface in the same manner. The barrier film was dry-laminated and 64 cm in width was aged at 50 ° C. for 2 days, then bottom sealed and cut to obtain a bag having only a bottom seal of width 64 × length 60. As described above, a barrier bag with a high cleanliness was obtained. Table 1 shows the results of measuring the particles in the bag.
[0029]
[Table 1]

[0030]
By the packaging bag obtained by sand-laminating the inflation film and the barrier film of the present invention, the inner surface does not come into contact with the outside air until the product is packaged, so that there is no adhesion of dust and the like. In addition, since the inflation film is used, the film forming temperature (melting temperature of the resin) is lower than that of the extruded film, so that the elution of low molecular components due to film deterioration is small. Furthermore, since the invention of claim 2 does not use an adhesive or an anchor coat agent and is sand-laminated, there is no elution of chemical substances derived from the components. By obtaining such a packaging bag with a clean inner surface, it has become possible to use it as a packaging material requiring a higher degree of cleanness as well as existing packaging materials such as a hard disk.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a structural cross-sectional view of a barrier packaging material of the present invention, wherein (a) is a single side, and (b) is a diagram in which a barrier film is laminated and laminated on both sides.
FIGS. 2A and 2B are explanatory views when a bag is made using the barrier packaging material of the present invention, FIG. 2A is a sectional view of the configuration, and FIG. 2B is a perspective view of the bag.
FIGS. 3A and 3B are explanatory views when a bag is made using another barrier packaging material of the present invention, FIG. 3A is a sectional view of the configuration, and FIG. 3B is a perspective view of the bag.
FIG. 4 is a schematic view illustrating a method for producing the barrier packaging material of the present invention.
5A and 5B are perspective views showing a film shape, in which FIG. 5A shows a tubular film, FIG. 5B shows a belt-like film, and FIG. 5C shows a barrier packaging material film.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Injection machine 2 ... Circular die 3 ... Tubular film 4 ... Pinch roller 5 ... Band-shaped film 6 ... Adhesive resin 7 ... Press roller 8 ... Barrier film 9, 10, 20 ... Barrier packaging material 11 ... Tubular film 12 ... Adhesive resin 13 ... Barrier film 14 ... Thermal fusion part 30 ... Bag

Claims (4)

On the outer surface of the tube-shaped film processed by the inflation method, a barrier film layer larger than the width of the tube-shaped film is melt-extruded between the adhesive resin and laminated by sand lamination , and the barrier film is processed. Barrier packaging material characterized by wrapping a tube-shaped film . 2. The barrier packaging material according to claim 1 , wherein when the lamination lamination process is performed by the sand lamination, the lamination is performed without using an adhesive or an anchor coating agent. The packaging bag produced using the barrier packaging material of any one of Claim 1 or Claim 2 . The packaging bag according to claim 3 , wherein when the barrier packaging material is manufactured, the bag is cut in a final process after the bag is formed.

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