JP5061863B2 - Packaging bag with release film - Google Patents

Description

  The present invention relates to a packaging bag suitable for packaging of electronic parts, particularly semiconductor products that do not like dust and dust, magnetic disks, silicon wafers, etc., and particularly has a structure suitable for packaging by vacuum sealing, contamination of dust and the like. The present invention relates to a packaging bag for preventing contents.

  Products such as semiconductors and precision instruments are extremely disliked with dust, dust, and dust, so their production is performed in a clean room with a high degree of cleanliness. Also, gloves with high cleanliness are used. When an article is brought into the environment from outside the clean room, it is often packaged in a plastic film bag.

  As this packaging bag, as disclosed in Patent Document 1, a protective film layer that becomes an outer surface after packaging is provided on the surface of a bag made of a packaging film, and the protective film layer is contaminated by transportation or the like. There are films and bags that peel off the contaminated protective film layer and allow the outermost layer to return to a clean state when it is brought into the clean room again.

  However, this packaging bag has a protective film layer (hereinafter referred to as a protective film layer = release film, referred to as a release film) and a packaging film (“base material layer”) in close contact with each other when the release film after use is removed. There is a problem of difficulty in peeling.

  The release film seals the contents and then peels off, but the bag after containing and sealing the contents in a three-dimensional shape has irregularities in the shape, and it is difficult to automatically peel off the release film with a machine. . Further, in the case of vacuum packaging that is normally performed, the problem is serious because the unevenness of the shape becomes more severe according to the shape of the contents.

  For this reason, when it is difficult to remove the peeling film with a machine, peeling is performed manually. In this case, if the peeling film and the “base material layer” are in close contact with each other, there remains a problem that peeling resistance is strong and the film cannot be easily peeled off.

  This is because when peeling film is peeled off, even when the width of the peeling part is narrow and the peeling strength is weak at the start of peeling, it is necessary to gradually peel off the entire width or longitudinal direction of the bag, so that the peeling width of the peeling film increases. This is because the force required to peel off according to the above increases.

  For example, even if the strength between the peeling film and the “base material layer” is 20 g / 15 mm width (90 ° peeling), if the bag-making width is 200 mm, a force of 226 g or more is required until the peeling finishes for a certain period. . Further, in the case of 180 ° peeling that is close to an actual operation, a force approximately doubled is required, and further force is required when the contents are sealed and the shape is complicated.

  For this reason, the release film is difficult to peel off, which places a burden on the operator. Also, if the release film has any scratches, the release film tears during the peeling operation and cannot be peeled off at all, and the release film contaminated by the outside air remains in the bag and cannot perform the function of removing surface contamination. . These problems are caused by the fact that the entire surface of the release film and the “base material layer” are in close contact.

Conversely, in order to simplify the peeling operation, it is conceivable to reduce the bonding strength between the peeling film and the “base material layer”. In that case, since the problem that a peeling film peels off from a "base material layer" in use generate | occur | produces, peeling strength cannot be weakened more than fixed.

  When the release film and the “base material layer” are completely adhered, the necessary adhesion strength is 15 to 20 g / in order for the release film not to be peeled off from the “base material layer” during use such as transportation after packaging the contents. The 15 mm width (90 ° peeling) is the minimum value, but at this level, the above-mentioned release film is difficult to peel off, and the problem that the operator is burdened cannot be solved.

  In order to solve the above problem, the peeling film and the packaging material film are in close contact with each other only at the peripheral edge so that they can be peeled off, and the release film is characterized by not being in close contact with each other in the contents storage part other than the peripheral edge. Thought of a bag.

  However, in the packaging bag, the side opposite to the side where peeling peeling occurs is peeled off in the width direction or longitudinal direction of the bag at the end of the operation of peeling the peeling film from the packaging material film, and the peeling width of the peeling film is large. Therefore, it was found that the force required for peeling increases.

Therefore, the peeling film and the double film peripheral part where the packaging material film is overlapped are sealed, and the peeling film and the packaging material film are in close contact with each other except for one side, and the other side is between the peeling films. Although the packaging material film and the release film are overlapped with each other in the storage part other than the peripheral part, the packaging body can be easily peeled off. It was found that when the contents were vacuum-sealed inside the film, a recess was formed in the packaging material film along the shape of the content, and the release film was sandwiched between the recesses and became difficult to peel off.
JP-A-7-330020

  The present invention relates to the above-described problem relating to a packaging bag having a release film formed by overlapping a release film and a packaging material film with a sealant layer of the packaging material film facing each other and sealing a peripheral portion. An object of the present invention is to provide a packaging bag having a release film that can be easily peeled off from a packaging material film to protect the packaging material film from contamination such as dust and dust. And

  The invention of claim 1 of the present invention is a packaging bag comprising a double film in which a peeling film and a packaging material film are overlapped, and a sealant layer of the packaging material film is opposed to each other and a peripheral portion is sealed. The release film and the packaging material film are in close contact with each other at the peripheral portion, are not in close contact with the contents storage portion other than the peripheral portion, and two sides of the peripheral portion of the packaging bag are the release film and the packaging. In a packaging bag having a release film, the material film is not in close contact, and the release film is extended longer than the packaging material film only on one side thereof, and the release films are in close contact with each other at the peripheral edge. is there.

  Thus, according to the first aspect of the present invention, there is provided a packaging bag in which a peelable film and a double film in which a packaging material film is overlapped are sealed at the peripheral portion with the sealant layers of the packaging material film facing each other. The release film and the packaging material film are in close contact with each other excluding two sides so that the release film can be peeled off, the release film and the packaging material film are in close contact with each other in a state where the release films are in close contact with each other. In addition, the packaging material film and the release film are not in close contact with each other in the storage part other than the peripheral part.

For this reason, the contents are placed inside the packaging material film and vacuum sealed, and at the same time, if air is placed between the release film and the packaging material film to inflate and seal, the contents can be shaped by vacuum-sealing the contents inside the packaging material film. Thus, the release film is not sandwiched between the recesses that can be formed into the packaging material film, and the release film can be easily peeled off from the packaging material film.

  According to a second aspect of the present invention, the packaging material film according to the first aspect of the present invention comprises a base material layer made of a biaxially stretched plastic film and a sealant layer made of a polyolefin resin, and the release film comprises an outer layer and an inner layer. It is a packaging bag which has a peeling film characterized by consisting of a heat-fusible resin layer.

  As described above, the packaging bag having the release film of the present invention is formed by making a double film in which the release film and the packaging material film are overlapped, and the release film located outside the double film can be easily peeled off. A clean packaging bag can be obtained easily and reliably after the release film is peeled off.

The present invention will be described in detail below based on one embodiment.
<FIG. 1> shows one Example of the packaging bag which has a peeling film of this invention, (a) is plane explanatory drawing, (b) is AA 'line cross-sectional explanatory drawing of (a). .
<FIG. 2> is a partially enlarged cross-sectional explanatory view showing an example of the layer structure of the packaging bag having the release film of the present invention.

The packaging bag 1 having the release film of the present invention includes, for example, a double film 10 in which a release film 11 and a packaging material film 12 are overlapped as shown in <FIG. 1> and <FIG. 2>. It is a packaging bag formed by sealing the peripheral portion 2-1 with the sealant layers 14 facing each other.

  The release film 11 and the packaging material film 12 are in close contact with each other at the two peripheral edges 2-2, and the other two sides 2-3 are not in contact with each other. The release films are in close contact with each other on the side 2-4, and the release film and the packaging material film are not in close contact with each other in the storage unit 3 other than the peripheral portion.

  The packaging material film 12 includes a base layer 13 made of a biaxially stretched plastic film and a sealant layer 14 made of a polyolefin resin, and the release film 11 is a heat-fusible resin of an outer layer 15 and an inner layer 16. Consists of layers.

  As the outer layer 15 of the release film 11, a biaxially stretched polypropylene film, a biaxially stretched polyester film, a biaxially stretched nylon film, an aluminum foil, or the like can be used. As the inner layer 16 of the release film 11, polyethylene, polypropylene, linear A polyolefin resin film such as low density polyethylene can be preferably used.

  As the base material layer 13 of the packaging material film 12 disposed inside the release film, a biaxially stretched plastic film such as nylon can be preferably used, and the sealant layer 14 of the packaging material film is the same as the inner layer of the release film. Polyolefin resin films such as polyethylene, polypropylene, and linear low density polyethylene can be preferably used.

  Although not shown, if necessary, a biaxially stretched polypropylene film, a biaxially stretched polyester film, a biaxially stretched nylon film, an aluminum foil or the like is provided between the base material layer 13 and the sealant layer 14 of the packaging material film 12. An intermediate layer can also be provided.

The outer layer 15 and the inner layer 16 of the release film 11 and the base material layer 13 and the sealant layer 14 of the packaging material film 12 are, for example, a dry lamination method using a polyester resin-based two-component reactive adhesive, or a molten polyethylene. Can be bonded by a generally known laminating method such as an extrusion laminating method.
The form of the packaging bag can be applied to a three-sided seal bag, a jointed bag, a gusset bag, and the like.

  Specific examples of the present invention will be described below.

As the release film 11, a 12 μm-thick biaxially stretched polypropylene film as the outer layer 15 and a 40 μm-thick polyethylene film (melt flow rate: 2 g / 10 min, melting point: 110 ° C.) as the inner layer 16 are passed through molten polyethylene. A release film 11 having a layer structure of biaxially stretched polypropylene film (thickness 12 μm) / polyethylene (thickness 15 μm) / polyethylene film (thickness 40 μm) was prepared. The outer side of the inner polyethylene layer was subjected to corona discharge treatment.
The melt flow rate (MFR) was measured according to JIS K7210, and the melting point was measured according to JIS K7121.

  Separately, a biaxially stretched nylon film made by a tubular method having a thickness of 15 μm and an aluminum foil having a thickness of 7 μm are bonded together by a dry laminating method via a two-component reactive polyester resin adhesive to form a composite film. A biaxially stretched nylon film produced by a tubular method having a thickness of 15 μm was bonded to the aluminum foil surface by a dry laminating method via a two-component reactive polyester resin adhesive, and a biaxially stretched nylon film (thickness 15 μm) ) / Adhesive / aluminum foil (thickness 7 μm) / adhesive / biaxially stretched nylon film (thickness 15 μm).

  In this configuration, the first biaxially stretched nylon film (thickness 15 μm) is the base layer in contact with the release film 11, and the subsequent aluminum foil (thickness 7 μm) / adhesive / biaxially stretched nylon film (thickness) 15 μm) corresponds to the intermediate layer in contact with the sealant layer 14. The biaxially stretched nylon film surface on the side in contact with the release film 11 is an untreated surface that is not subjected to a surface treatment such as corona discharge.

  A low-density polyethylene film having a thickness of 80 μm serving as a sealant layer 14 is dried on a biaxially stretched nylon film surface of the base material layer 13 that is not in contact with the release film 11 via a two-component reactive polyester resin adhesive. Bonded by laminating method, biaxially stretched nylon film (thickness 15 μm) / adhesive / aluminum foil (thickness 7 μm) / adhesive / biaxially stretched nylon film (15 μm) / adhesive / low density polyethylene film (thickness) A packaging material film 12 having a layer structure of 80 μm) was produced.

  The polyethylene surface (corona discharge treatment surface) of the release film 11 thus produced and the untreated stretched nylon film surface of the packaging material film 12 are overlapped to form a double film 10, and two double films are formed. Produced.

  A two-sided sealing bag having a length of 360 mm, a width of 260 mm, and a seal width of 10 mm is formed by placing the two double films so that the surfaces of the low-density polyethylene film (thickness: 80 μm) that are the sealant layer 14 of the packaging material film 12 face each other. A packaging bag having the release film of Example 1 was produced under heat seal conditions. The heat sealing conditions are a temperature of 200 ° C., a time of 0.5 seconds, a pressure of 0.2 Mpa, and a pressurization frequency of 3 times.

  An electronic substrate is vacuum-sealed in this packaging bag, and at the same time, air is injected between the outer bag made of the peeling film and the inner bag made of the packaging material film to seal the opening 4 made of the packaging material film and the peeling film. did. Thereafter, the outer release film was peeled off by hand. The conventional method disclosed in Patent Document 1, that is, a type in which the release film is in close contact with the packaging material film and a type of three-side sealed bag in which all three sides of the release film and the packaging material film in the peripheral portion are sealed. The removal of the release film was significantly easier than when it was used.

One Example of the packaging bag which has a peeling film of this invention is shown. (A) is plane | planar explanatory drawing, (b) is AA 'line sectional explanatory drawing of (a). It is a partial expanded sectional view which shows one Example of the laminated constitution of the packaging bag which has a peeling film of this invention.

Explanation of symbols

1 ...... Packaging bag 2-1 ...... Peripheral part (part where packaging material films are in close contact)
2-2 Peripheral part (The release film and the packaging material film are in close contact with each other in a peelable state.
Part)
2-3 ... Peripheral part (side where release film and packaging material film are not in close contact with contents)
2-4 ... Peripheral part (side where release films are in close contact)
3 ...... Contents storage 4 ...... Opening 10 ...... Double film 11 ...... Release film 12 ...... Packaging material film 13 ...... Base material layer 14 ...... Sealant layer 15 ...... Outer layer 16 ...... Inner layer

Claims (2)

  A peelable film and a double film obtained by superimposing a packaging material film, a packaging bag formed by sealing a peripheral portion with a sealant layer of a packaging material film facing each other, wherein the peeling film and the packaging material film are: The peripheral edge is peelably attached, the contents storage part other than the peripheral part is not closely attached, and the peeling film and the packaging material film are not closely attached to the two sides of the packaging bag peripheral part. A packaging bag having a release film characterized in that the release film is extended longer than the packaging material film only on one side, and the release films are in close contact with each other at the periphery.   The packaging material film is composed of a base material layer made of a biaxially stretched plastic film and a sealant layer made of a polyolefin resin, and the release film has an outer layer and an inner layer made of a heat-fusible resin layer. A packaging bag comprising the release film according to claim 1.

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