JP5286697B2 - Packaging bag with release film - Google Patents

Description

  The present invention relates to a packaging bag having a release film suitable for packaging electronic parts, particularly semiconductor products that dislike dust and dust, magnetic disks, silicon wafers, and the like.

  Since products such as semiconductors and precision equipment are extremely reluctant to dust, dust, dust and other dust, their production is performed in a clean room with a high degree of cleanliness. Gloves such as those with high cleanliness are also 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, for example, a protective film layer is provided on the surface of the packaging bag, and after the protective film layer is contaminated by transportation or the like, the contaminated protective film layer is peeled off when transported again into the clean room, and the outermost layer There are films and bags that can return to a clean state (for example, see Patent Document 1).

The said prior art document is shown.
JP-A-7-330020.

  However, this packaging bag has a problem that it is difficult to peel off the release film due to the close contact between the protective film layer (hereinafter referred to as protective film layer = release film and referred to as release film) and the base material layer.

  For example, the release film is supposed to be peeled after the contents are sealed, but the bag after the contents are accommodated and sealed is uneven in shape, and it is difficult to peel the release film automatically by a machine.

  Peeling of the release film by manual work has a strong resistance and cannot be easily removed because the release film and the base material layer are in close contact with each other.

  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.

  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 266 g or more is required until the peeling finishes for a certain period. Further, in the case of 180 ° peeling that is close to the actual work, an approximately double force is required, and when the contents are sealed and the shape becomes complicated, more force may be required.

  For this reason, the release film is difficult to peel off, which places a burden on the operator. In addition, if there is any scratch or the like on the release film, the release film is torn during the peeling operation and cannot be peeled off at all, and the release film contaminated with the outside air remains in the bag and cannot satisfy the required function. 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 from a base material layer in use generate | occur | produces, peeling strength cannot be weakened more than fixed.

  When the peelable film and the base material layer are completely adhered, the minimum adhesion value is 15 to 20 g / 15 mm width (90 ° peel) for preventing the peelable film from being peeled from the base material layer. However, the problem that the above-described release film is difficult to peel off and burdens the operator cannot be solved.

  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

As means for solving the above-mentioned problems, the invention according to claim 1 is characterized in that the peeling film and the double film in which the packaging material film is overlapped, the sealant layer of the packaging material film is opposed to each other, and the peripheral portion is formed. It is a packaging bag formed by heat-sealing, and the release film and the packaging material film are in close contact with each other at the periphery, and are not in close contact with each other in the storage portion other than the periphery, and the release film is The outer layer made of a biaxially stretched polypropylene film and the inner layer made of a heat- fusible polyolefin resin layer are bonded together via a molten polyethylene resin, and the packaging material film is a base material layer made of a biaxially stretched plastic film When an intermediate layer formed by laminating the same biaxially stretched plastic film and the aluminum foil substrate layer, a polyolefin-based resin Consists sealant layer made of the adhesive strength of the packaging material film and the release film in the peripheral portion, the temperature 200 ° C., time of 0.5 seconds, the pressure 0.2 MPa, the heat-sealing condition of the pressure voltage dividing number 3 times, 15 It is a packaging bag which has a peeling film characterized by being -225g / 15mm.

  Thus, according to the invention described in claim 1, the double-layer film in which the peeling film and the packaging material film are overlapped with each other is a packaging bag in which the sealant layer of the packaging material film is opposed to each other and the peripheral portion is sealed. Since the release film and the packaging material film are in close contact with the peripheral portion so that they can be peeled off, the packaging material film and the release film just overlap each other in the storage portion other than the peripheral portion, The release film can be easily peeled from the double film.

  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.
The packaging bag (1) having the release film of the present invention comprises, for example, as shown in FIGS. 1 and 2, a double film (10) in which a release film (11) and a packaging material film (12) are overlapped, It is a packaging bag which seals a peripheral part (2) by making the sealant layer (14) of a packaging material film mutually oppose.

  The release film (11) and the packaging material film (12) are in close contact with the peripheral portion (2) so as to be peelable, and are not in close contact with each other in the storage portion (3) other than the peripheral portion. Yes.

  The packaging material film (12) includes a base material 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 made of an outer layer (15 ) And the heat-fusible resin layer of the inner layer (16).

  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), Polyolefin resin films such as polyethylene, polypropylene and linear 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 peeled off. As with the inner layer of the film, polyolefin resin films such as polyethylene, polypropylene, and linear low density polyethylene can be preferably used.

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

  The outer layer (15) and inner layer (16) of the release film (11), and the base material layer (13) and sealant layer (14) of the packaging material film (12) are, for example, a polyester resin-based two-component reaction type They can be bonded together by a generally known laminating method such as a dry laminating method using an adhesive or an extrusion laminating method via molten polyethylene.

  The form of the packaging bag can be applied to a three-sided seal bag, a jointed bag, a gusset bag, and the like.

  Next, the present invention will be described in more detail with reference to specific examples.

  (A) Experiment 1

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 (MFR: 2, melting point: 110 ° C.) as the inner layer (16) were fused polyethylene. A release film (11) having a layer structure of biaxially oriented polypropylene film (thickness 12 μm) / polyethylene (thickness 15 μm) / polyethylene film (thickness 40 μm) was prepared. The outer surface of the inner polyethylene layer was subjected to corona discharge treatment.
The MFR was measured according to JIS K7210, and the melting point was measured according to JIS K7121.

  Separately, a biaxially stretched nylon film produced 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) to form a base material layer (13) for a packaging material film (12) having a layer structure.

In this configuration, the first biaxially stretched nylon film (thickness 15 μm) is the base layer, and the subsequent aluminum foil (thickness 7 μm) / adhesive / biaxially stretched nylon film (thickness 15 μm) is the intermediate layer. It hits.

  Moreover, 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 surface treatment such as corona discharge.

  On the surface of the biaxially stretched nylon film that is not in contact with the release film (11) of the base material layer (13), a low-density polyethylene film having a thickness of 80 μm that becomes the sealant layer (14) is a two-component reaction type polyester resin system. Bonded by dry laminating method through an adhesive, biaxially stretched nylon film (thickness 15 μm) / adhesive / aluminum foil (thickness 7 μm) / adhesive / biaxially stretched nylon film (thickness 15 μm) / adhesive / A packaging material film (12) having a layer structure of a low-density polyethylene film (thickness 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). Two double films were produced.

  The two double films are three-sided with a length of 360 mm, a width of 260 mm, and a seal width of 10 mm, with the low-density polyethylene film (thickness of 80 μm) as the sealant layer (14) of the packaging material film (12) facing each other. A seal bag was produced under the following heat seal conditions to obtain a packaging bag having the release film of Example 1.

  Heat sealing conditions; temperature to 200 ° C., time to 0.5 seconds, pressure to 0.2 MPa, pressurization frequency to 3 times.

  Example 1 with the same material configuration as Example 1 except that a 40 μm thick polyethylene film prepared using a resin with MFR: 4 and melting point: 110 ° C. was used for the inner layer (16) of the release film (11). A double film (10) similar to the above was prepared.

  In the same manner as in Example 1, the two double films had a low-density polyethylene film (thickness of 80 μm) as a sealant layer (14) of the packaging material film (12) facing each other, 360 mm in length, 260 mm in width, A three-side sealed bag having a seal width of 10 mm was produced under the same heat seal conditions as in Example 1, and a packaging bag having the release film of Example 2 was obtained.

  Same as Example 1 except that a polyethylene film having a thickness of 40 μm prepared using a resin with MFR: 2 and melting point: 110 ° C. different from Example 1 was used for the inner layer (16) of the release film (11). A double film (10) similar to that of Example 1 was produced with the material composition described above.

  In the same manner as in Example 1, the two double films had a low-density polyethylene film (thickness of 80 μm) as a sealant layer (14) of the packaging material film (12) facing each other, 360 mm in length, 260 mm in width, A three-side sealed bag having a seal width of 10 mm was produced under the same heat seal conditions as in Example 1, and a packaging bag having the release film of Example 3 was obtained.

  The same material composition as in Example 1 except that a linear low-density polyethylene film having a thickness of 40 μm prepared using a resin having an MFR of 2 and a melting point of 110 ° C. was used for the inner layer (16) of the release film (11). Then, a release film (11) having a layer structure composed of a biaxially stretched polypropylene film (thickness 12 μm) / polyethylene (thickness 15 μm) / linear low density polyethylene film (thickness 40 μm) was prepared. The outer surface of the linear low density polyethylene as the inner layer was subjected to corona discharge treatment.

Separately, as in Example 1, a biaxially stretched nylon film produced by a tubular method having a thickness of 15 μm and an aluminum foil having a thickness of 7 μm were bonded by a dry laminating method via a two-component reactive polyester resin adhesive. A biaxially stretched nylon film prepared by a tubular method having a thickness of 15 μm is bonded to the aluminum foil surface of this composite film by a dry lamination method via a two-component reaction type polyester resin adhesive. A base material layer for a packaging material film (12) having a layer structure composed of an axially stretched nylon film (thickness 15 μm) / adhesive / aluminum foil (thickness 7 μm) / adhesive / biaxially stretched nylon film (thickness 15 μm) (13) was produced.
In addition, 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 surface treatment such as corona discharge.

  On the surface of the biaxially stretched nylon film that is not in contact with the release film (11) of the base material layer (13), a low-density polyethylene film having a thickness of 80 μm that becomes the sealant layer (14) is applied in the same manner as in Example 1. Bonded by reactive lamination via a reactive polyester resin adhesive, biaxially stretched nylon film (thickness 15 μm) / adhesive / aluminum foil (thickness 7 μm) / adhesive / biaxially stretched nylon film (thickness) A packaging material film (12) having a layer structure of 15 μm) / adhesive / low density polyethylene film (thickness 80 μm) was produced.

  The double film (10) was prepared by placing the linear low density 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) facing each other. The two double films were produced.

Two double films, the low-density polyethylene film (thickness 80 μm) surfaces that are the sealant layer (14) of the packaging material film (12) face each other, the same length 360mm, width 260mm as in Example 1, A three-sided seal bag having a seal width of 10 mm was produced under the same heat seal conditions as in Example 1, and a packaging bag having the release film of Example 4 serving as a comparative example was obtained.

  The same material composition as in Example 4 except that a linear low-density polyethylene film having a thickness of 40 μm prepared using a resin having an MFR of 2 and a melting point of 125 ° C. was used for the inner layer (16) of the release film (11). A double film (10) similar to that of Example 4 was produced.

  Two double films, the low-density polyethylene film (thickness 80 μm) surfaces that are the sealant layer (14) of the packaging material film (12) face each other, the same length 360mm, width 260mm as in Example 1, A three-side sealed bag with a seal width of 10 mm was produced under the same heat seal conditions as in Example 1, and a packaging bag having the release film of Example 5 was obtained.

  In Example 1, instead of the biaxially stretched nylon film (thickness 15 μm, surface untreated) of the base material layer (13), a biaxially stretched polypropylene film (thickness 15 μm, surface untreated) was used. A base material layer (13) having a layer structure composed of an axially stretched polypropylene film (thickness 15 μm) / adhesive / aluminum foil (thickness 7 μm) / adhesive / biaxially stretched polypropylene film (thickness 15 μm) was produced.

Other than this, the same release film (11) as in Example 1 was used, and a low-density polyethylene having a thickness of 80 μm serving as a sealant layer (14) was formed on the biaxially oriented polypropylene film surface not in contact with the release film (11). The film is bonded by a dry laminating method through a two-component reactive polyester resin adhesive, biaxially stretched polypropylene film (thickness 15 μm) / adhesive / aluminum foil (thickness 7 μm) / adhesive / biaxial stretching A packaging material film (12) having a layer constitution of polypropylene film (thickness 15 μm) / adhesive / low density polyethylene film (thickness 80 μm) was produced.

  The polyethylene surface (corona discharge treatment surface) of the release film (11) thus produced and the untreated stretched polypropylene film surface of the packaging material film (12) are overlapped to form a double film (10). Two double films were produced.

  The two double films are three-sided with a length of 360 mm, a width of 260 mm, and a seal width of 10 mm, with the low-density polyethylene film (thickness of 80 μm) as the sealant layer (14) of the packaging material film (12) facing each other. A sealing bag was produced under the same heat sealing conditions as in Example 1, and a packaging bag having the release film of Example 6 was obtained.

  Example 2 is the same as Example 2 except that a biaxially stretched polypropylene film (thickness 15 μm, surface untreated) was used instead of the biaxially stretched nylon film (thickness 15 μm, surface untreated) of the base material layer (13). A double film similar to that of Example 1 was produced using the same material and configuration.

  In the same manner as in Example 1, the two double films had a low-density polyethylene film (thickness of 80 μm) as a sealant layer (14) of the packaging material film (12) facing each other, 360 mm in length, 260 mm in width, A three-sided seal bag with a seal width of 10 mm was produced under the same heat seal conditions as in Example 1, and a packaging bag having the release film of Example 7 was obtained.

  A double film similar to that of Example 1 was produced under the same conditions as in Example 6 except that the surface of the biaxially stretched polypropylene film of the base material layer (13) was subjected to corona discharge treatment.

  In the same manner as in Example 1, the two double films had a low-density polyethylene film (thickness of 80 μm) as a sealant layer (14) of the packaging material film (12) facing each other, 360 mm in length, 260 mm in width, A three-side sealed bag with a seal width of 10 mm was produced under the same heat seal conditions as in Example 1, and a packaging bag having the release film of Example 8 was obtained.

  A double film similar to Example 1 was produced under the same conditions as Example 7 except that the surface of the biaxially stretched polypropylene film of the base material layer (13) was subjected to corona discharge treatment.

  In the same manner as in Example 1, the two double films had a low-density polyethylene film (thickness of 80 μm) as a sealant layer (14) of the packaging material film (12) facing each other, 360 mm in length, 260 mm in width, A three-side sealed bag having a seal width of 10 mm was produced under the same heat seal conditions as in Example 1, and a packaging bag having the release film of Example 9 was obtained.

  Example 1 is the same as Example 1 except that a biaxially stretched polyester film (thickness 15 μm, surface untreated) was used instead of the biaxially stretched nylon film (thickness 15 μm, surface untreated) of the base material layer (13). A double film similar to that of Example 1 was produced using the same material and configuration.

  In the same manner as in Example 1, the two double films had a low-density polyethylene film (thickness of 80 μm) as a sealant layer (14) of the packaging material film (12) facing each other, 360 mm in length, 260 mm in width, A three-sided seal bag having a seal width of 10 mm was produced under the same heat seal conditions as in Example 1, and a packaging bag having the release film of Example 10 was obtained.

  Example 2 is the same as Example 2 except that a biaxially stretched polyester film (thickness 15 μm, surface untreated) was used instead of the biaxially stretched nylon film (thickness 15 μm, surface untreated) of the base material layer (13). A double film similar to that of Example 1 was produced using the same material and configuration.

  In the same manner as in Example 1, the two double films had a low-density polyethylene film (thickness of 80 μm) as a sealant layer (14) of the packaging material film (12) facing each other, 360 mm in length, 260 mm in width, A three-side sealed bag having a seal width of 10 mm was produced under the same heat seal conditions as in Example 1, and a packaging bag having the release film of Example 11 was obtained.

  Biaxially oriented polypropylene film (thickness 12 μm) / polyethylene with the same material and configuration as in Example 1 except that the outer surface of polyethylene of the inner layer (16) of the release film (11) was not subjected to corona discharge treatment (untreated). A release film (11) having a layer structure of (thickness 15 μm) / polyethylene film (MFR: 2, melting point: 110 ° C.) (thickness 40 μm) was produced. The outer surface of the inner polyethylene layer is not subjected to surface treatment such as corona discharge.

  In addition, the same thing as Example 1 was used for the base material layer (13) and sealant layer (14) of a packaging material film (12).

  The polyethylene film (untreated surface) of the release film (11) produced in this manner and the untreated nylon film surface produced by the tubular method of the packaging material film (12) are placed facing each other and double-coated (10 The two double films were produced.

  Two double films, the low-density polyethylene film (thickness 80 μm) surfaces that are the sealant layer (14) of the packaging material film (12) face each other, the same length 360mm, width 260mm as in Example 1, A three-sided seal bag with a seal width of 10 mm was produced under the same heat seal conditions as in Example 1, and a packaging bag having the release film of Example 12 was obtained.

  Example 1 with the same material structure as Example 12 except that a 40 μm thick polyethylene film prepared using a resin with MFR: 4 and melting point: 110 ° C. was used for the inner layer (16) of the release film (11). A double film (10) similar to the above was prepared.

  In the same manner as in Example 1, the two double films were placed in the same vertical direction as in Example 1, with the surfaces of the low-density polyethylene film (thickness 80 μm), which is the sealant layer (14) of the packaging material film (12) facing each other. A three-side sealed bag having a width of 360 mm, a width of 260 mm, and a seal width of 10 mm was produced under the same heat sealing conditions as in Example 1, and a packaging bag having the release film of Example 13 was obtained.

  The same as Example 12 except that a 40 μm thick polyethylene film prepared using a resin with MFR: 2 and melting point: 110 ° C. different from Example 12 was used for the inner layer (16) of the release film (11). A double film (10) similar to that of Example 1 was produced with the material composition described above.

  In the same manner as in Example 1, the two double films had a low-density polyethylene film (thickness of 80 μm) as a sealant layer (14) of the packaging material film (12) facing each other, 360 mm in length, 260 mm in width, A three-side sealed bag having a seal width of 10 mm was produced under the same heat sealing conditions as in Example 1, and a packaging bag having the release film of Example 14 was obtained.

  The same material composition as in Example 12 except that a linear low-density polyethylene film having a thickness of 40 μm prepared using a resin having an MFR of 2 and a melting point of 110 ° C. was used for the inner layer (16) of the release film (11). Then, a release film (11) having a layer structure composed of a biaxially stretched polypropylene film (thickness 12 μm) / polyethylene (thickness 15 μm) / linear low density polyethylene film (thickness 40 μm) was prepared. The outer surface of the linear low density polyethylene in the inner layer is not subjected to surface treatment such as corona discharge.

Separately, as in Example 1, a biaxially stretched nylon film produced by a tubular method having a thickness of 15 μm and an aluminum foil having a thickness of 7 μm were bonded by a dry laminating method via a two-component reactive polyester resin adhesive. A biaxially stretched nylon film prepared by a tubular method having a thickness of 15 μm is bonded to the aluminum foil surface of this composite film by a dry lamination method via a two-component reaction type polyester resin adhesive. A base material layer for a packaging material film (12) having a layer structure composed of an axially stretched nylon film (thickness 15 μm) / adhesive / aluminum foil (thickness 7 μm) / adhesive / biaxially stretched nylon film (thickness 15 μm) (13) was produced.
In addition, 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 surface treatment such as corona discharge.

  On the surface of the biaxially stretched nylon film that is not in contact with the release film (11) of the base material layer (13), a low-density polyethylene film having a thickness of 80 μm that becomes the sealant layer (14) is applied in the same manner as in Example 1. Bonded by reactive lamination via a reactive polyester resin adhesive, biaxially stretched nylon film (thickness 15 μm) / adhesive / aluminum foil (thickness 7 μm) / adhesive / biaxially stretched nylon film (thickness) A packaging material film (12) having a layer structure of 15 μm) / adhesive / low density polyethylene film (thickness 80 μm) was produced.

  The double film (10) is obtained by overlapping the linear low-density polyethylene surface (untreated surface) of the release film (11) thus produced and the untreated stretched nylon film surface of the packaging material film (12) facing each other. Two such double films were produced.

  Two double films, the low-density polyethylene film (thickness 80 μm) surfaces that are the sealant layer (14) of the packaging material film (12) face each other, the same length 360mm, width 260mm as in Example 1, A three-side sealed bag having a seal width of 10 mm was produced under the same heat seal conditions as in Example 1, and a packaging bag having the release film of Example 15 was obtained.

  The same material composition as in Example 15 except that a linear low-density polyethylene film having a thickness of 40 μm prepared using a resin having an MFR of 2 and a melting point of 125 ° C. was used for the inner layer (16) of the release film (11). A double film (10) similar to that of Example 15 was produced.

  Two double films, the low-density polyethylene film (thickness 80 μm) surfaces that are the sealant layer (14) of the packaging material film (12) face each other, the same length 360mm, width 260mm as in Example 1, A three-side sealed bag having a seal width of 10 mm was produced under the same heat seal conditions as in Example 1, and a packaging bag having the release film of Example 16 was obtained.

Instead of using a 15 μm thick biaxially stretched nylon film (surface untreated) produced by the tubular method, a 15 μm thick biaxially stretched nylon film (surface, corona discharge treatment) produced by the T-die method was used. Is the same material and configuration as in Example 12, biaxially stretched nylon film (thickness 15 μm, surface, corona discharge treatment) / adhesive / aluminum foil (thickness 7 μm) / adhesive / biaxially stretched nylon film (thickness) A packaging material film (12) having a layer structure of 15 μm) / adhesive / low density polyethylene film (thickness 80 μm) was produced.

  The polyethylene film (untreated surface) of the release film (11) having the same material and configuration as in Example 12 and the corona-treated stretched nylon film surface of the packaging material film (12) are opposed to form a double film (10). Two double films were produced.

  The two double films are three-sided with a length of 360 mm, a width of 260 mm, and a seal width of 10 mm, with the low-density polyethylene film (thickness of 80 μm) as the sealant layer (14) of the packaging material film (12) facing each other. A sealing bag was produced under the same heat sealing conditions as in Example 1, and a packaging bag having the release film of Example 17 was obtained.

  The same as Example 17 except that a 40 μm thick linear low density polyethylene film prepared using a resin with MFR: 4 and melting point: 110 ° C. was used for the polyethylene film of the inner layer (16) of the release film (11). A double film (10) similar to that of Example 17 with the material structure of

  Two double films, the low-density polyethylene film (thickness 80 μm) surfaces that are the sealant layer (14) of the packaging material film (12) face each other, the same length 360mm, width 260mm as in Example 1, A three-side sealed bag having a seal width of 10 mm was produced under the same heat seal conditions as in Example 1, and a packaging bag having the release film of Example 18 was obtained.

  The release film (11) was the same as in Example 12, and the packaging material film (12) was a biaxially stretched polyester film (thickness 15 μm, Except for using surface corona discharge treatment), the same structure as in Example 10 was used, and the low-density polyethylene untreated surface of the release film (11) and the biaxially stretched polyester film of the packaging material film (12) The release film and the packaging material film were overlapped with the corona-treated surfaces facing each other to obtain a double film (10).

  The two double films are three-sided with a length of 360 mm, a width of 260 mm, and a seal width of 10 mm, with the low-density polyethylene film (thickness of 80 μm) as the sealant layer (14) of the packaging material film (12) facing each other. A sealing bag was produced under the same heat sealing conditions as in Example 1, and a packaging bag having the release film of Example 19 was obtained.

  The release film (11) is the same as in Example 2, the packaging material film (12) is the same as in Example 19, the untreated surface of the low-density polyethylene of the release film (11), and the packaging material film The release film and the packaging material film were superposed with the corona-treated surface of the biaxially stretched polyester film of (12) facing each other to obtain a double film.

  The two double films are three-sided with a length of 360 mm, a width of 260 mm, and a seal width of 10 mm, with the low-density polyethylene film (thickness of 80 μm) as the sealant layer (14) of the packaging material film (12) facing each other. A sealing bag was produced under the same heat sealing conditions as in Example 1, and a packaging bag having the release film of Example 20 was obtained.

  The release film is the same as in Example 1, the packaging material film is the same as in Example 17, and the release film (11) has a low-density polyethylene corona discharge treatment surface and the packaging material film (12) has a T. The release film and the packaging material film were overlapped with each other so that the corona-treated surfaces of the biaxially stretched nylon film produced by the die method were opposed to form a double film.

  The two double films are three-sided with a length of 360 mm, a width of 260 mm, and a seal width of 10 mm, with the low-density polyethylene film (thickness of 80 μm) as the sealant layer (14) of the packaging material film (12) facing each other. A sealing bag was produced under the same heat sealing conditions as in Example 1, and a packaging bag having the release film of Example 21 serving as a comparative example was obtained.

  The release film is the same as in Example 2, the packaging material film is the same as in Example 17, the low-density polyethylene corona discharge treatment surface of the release film (11), and the packaging material film (12). The release film and the packaging material film were overlapped with the corona-treated surface of the biaxially stretched nylon film produced by the T-die method, to obtain a double film.

  The two double films are three-sided with a length of 360 mm, a width of 260 mm, and a seal width of 10 mm, with the low-density polyethylene film (thickness of 80 μm) as the sealant layer (14) of the packaging material film (12) facing each other. A sealing bag was produced under the same heat sealing conditions as in Example 1, and a packaging bag having the release film of Example 22 as a comparative example was obtained.

  The same release film as in Example 1 was used as the release film, and the same packaging material film as in Example 19, and the low density polyethylene corona discharge treated surface of the release film (11) and the packaging material film (12) were used. The release film and the packaging material film were overlapped with the corona discharge-treated surface of the axially stretched polyester film to prepare a double film (10).

  The two double films are three-sided with a length of 360 mm, a width of 260 mm, and a seal width of 10 mm, with the low-density polyethylene film (thickness of 80 μm) as the sealant layer (14) of the packaging material film (12) facing each other. A sealing bag was produced under the same heat sealing conditions as in Example 1, and a packaging bag having the release film of Example 23 as a comparative example was obtained.

  Thus, the adhesive strength between the peeling film of the sealing part of the packaging bag which has the peeling film of Example 1 to Example 23 and the packaging material film which were produced in this way was measured by the method of JIS Z1707. Moreover, the peeling feeling when peeling a peeling film from a packaging bag by hand was checked by sensory sense. The results are shown in Table 1.

（ｂ）実験２

(B) Experiment 2

  As the release film (11), a 12 μm-thick biaxially stretched polypropylene film as the outer layer (15) and a 30 μm-thick unstretched polypropylene film (for retort) as the inner layer (16) are laminated via molten polyethylene. A release film (11) having a layer structure of biaxially stretched polypropylene film (thickness 12 μm) / polyethylene (thickness 15 μm) / unstretched polypropylene film (thickness 30 μm) was prepared. The outer surface of the unstretched polypropylene film of the inner layer was subjected to corona discharge treatment.

The packaging material film (12) was the same as in Example 1, and was prepared by the corona discharge treatment surface of the unstretched polypropylene film of the release film (11) and the tubular method of the packaging material film (12). The release film and the packaging material film were overlapped with the untreated surface of the stretched nylon film facing to prepare a double film (10).

  The two double films are three-sided with a length of 360 mm, a width of 260 mm, and a seal width of 10 mm, with the low-density polyethylene film (thickness of 80 μm) as the sealant layer (14) of the packaging material film (12) facing each other. A seal bag was produced under the same heat seal conditions as in Example 1, and a packaging bag having the release film of Example 24 was obtained.

  The release film (11) is the same as in Example 24, the packaging material film (12) is the same as in Example 17, the corona discharge treatment surface of the unstretched polypropylene film of the release film, and the packaging material film ( The release film and the packaging material film were overlapped with the corona-treated surface of the biaxially stretched nylon film produced by the T-die method of 12) to produce a double film (10).

  The two double films are three-sided with a length of 360 mm, a width of 260 mm, and a seal width of 10 mm, with the low-density polyethylene film (thickness of 80 μm) as the sealant layer (14) of the packaging material film (12) facing each other. A sealing bag was produced under the same heat sealing conditions as in Example 1, and a packaging bag having the release film of Example 25 was obtained.

  The release film (11) was the same as in Example 24, and the packaging material film (12) was biaxially stretched by the T-die method instead of the biaxially stretched nylon film (untreated) prepared by the tubular method. A corona discharge-treated surface of the unstretched polypropylene film of the release film (11) and a packaging material film (12) using the same material and configuration as in Example 1 except that a nylon film (untreated) was used. The release film and the packaging material film were overlapped with the untreated surface of the biaxially stretched nylon film produced by the T-die method to produce a double film (10).

  The two double films are three-sided with a length of 360 mm, a width of 260 mm, and a seal width of 10 mm, with the low-density polyethylene film (thickness of 80 μm) as the sealant layer (14) of the packaging material film (12) facing each other. A sealing bag was produced under the same heat sealing conditions as in Example 1, and a packaging bag having the release film of Example 26 was obtained.

  The release film (11) is the same as in Example 24, the packaging material film (12) is the same as in Example 19, and the corona discharge treated surface of the unstretched polypropylene film of the release film and the packaging material film ( The release film and the packaging material film were superposed with the corona-treated surface of the biaxially stretched polyester film of 12) facing each other to produce a double film (10).

  The two double films are three-sided with a length of 360 mm, a width of 260 mm, and a seal width of 10 mm, with the low-density polyethylene film (thickness of 80 μm) as the sealant layer (14) of the packaging material film (12) facing each other. A sealing bag was produced under the same heat sealing conditions as in Example 1, and a packaging bag having the release film of Example 27 was obtained.

The release film (11) is the same as in Example 24, the packaging material film (12) is the same as in Example 8, the corona discharge-treated surface of the unstretched polypropylene film of the release film, and the packaging material film ( The release film and the packaging material film were overlapped with the corona-treated surface of the biaxially stretched polypropylene film of 12) to prepare a double film (10).

  The two double films are three-sided with a length of 360 mm, a width of 260 mm, and a seal width of 10 mm, with the low-density polyethylene film (thickness of 80 μm) as the sealant layer (14) of the packaging material film (12) facing each other. A sealing bag was produced under the same heat sealing conditions as in Example 1, and a packaging bag having the release film of Example 28 was obtained.

  The release film (11) is the same as in Example 24, the packaging material film (12) is the same as in Example 10, the corona discharge-treated surface of the unstretched polypropylene film of the release film, and the packaging material film ( The release film and the packaging material film were overlapped with the untreated surface of the biaxially stretched polyester film of 12) to prepare a double film (10).

  The two double films are three-sided with a length of 360 mm, a width of 260 mm, and a seal width of 10 mm, with the low-density polyethylene film (thickness of 80 μm) as the sealant layer (14) of the packaging material film (12) facing each other. A sealing bag was produced under the same heat sealing conditions as in Example 1, and a packaging bag having the release film of Example 29 serving as a comparative example was obtained.

  The release film (11) is the same as in Example 24, the packaging material film (12) is the same as in Example 6, the release film has a corona discharge-treated surface of the unstretched polypropylene film, and the packaging material film ( The release film and the packaging material film were superposed with the untreated surface of the biaxially stretched polypropylene film of 12) facing each other to prepare a double film (10).

  The two double films are three-sided with a length of 360 mm, a width of 260 mm, and a seal width of 10 mm, with the low-density polyethylene film (thickness of 80 μm) as the sealant layer (14) of the packaging material film (12) facing each other. A sealing bag was produced under the same heat sealing conditions as in Example 1, and a packaging bag having the release film of Example 30 as a comparative example was obtained.

  As the release film (11), a 12 μm-thick biaxially stretched polypropylene film as the outer layer (15) and a 30 μm-thick unstretched polypropylene film (for retort) as the inner layer (16) are laminated via molten polyethylene. A release film (11) having a layer structure of biaxially stretched polypropylene film (thickness 12 μm) / polyethylene (thickness 15 μm) / unstretched polypropylene film (thickness 30 μm) was prepared. The outer surface of the inner layer unstretched polypropylene film is not subjected to surface treatment.

  Using the same packaging material film (12) as in Example 1, the untreated surface of the unstretched polypropylene film of the release film (11) and the biaxial stretching produced by the tubular method of the packaging material film (12) A double film (10) was produced by superposing the release film and the packaging material film with the untreated surface of the nylon film facing each other.

The two double films are three-sided with a length of 360 mm, a width of 260 mm, and a seal width of 10 mm, with the low-density polyethylene film (thickness of 80 μm) as the sealant layer (14) of the packaging material film (12) facing each other. A sealing bag was produced under the same heat sealing conditions as in Example 1, and a packaging bag having the release film of Example 31 serving as a comparative example was obtained.

  Thus, the adhesive strength between the peeling film of the sealing part of the packaging bag which has the peeling film of Example 24 to Example 31 and the packaging material film which were produced in this way was measured by the method of JISZ1707. Moreover, the peeling feeling when peeling a peeling film from a packaging bag by hand was checked by sensory sense. The results are shown in Table 2.

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

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Packaging bag 2 ... Peripheral part, seal part 3 ... Storage part 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 (1)

A double-layer film in which a peeling film and a packaging material film are overlapped, and a packaging bag formed by heat-sealing 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 at the periphery, and are not in close contact with each other in the storage portion other than the periphery,
The release film is formed by laminating an outer layer made of a biaxially stretched polypropylene film and an inner layer made of a heat- fusible polyolefin resin layer via a molten polyethylene resin ,
The packaging material film, from a substrate layer made of biaxially stretched plastic film, an intermediate layer formed by laminating the same biaxially stretched plastic film and the aluminum foil substrate layer, a sealant layer comprising a polyolefin-based resin Become
The adhesive strength between the release film and the packaging material film at the peripheral edge is 15 to 225 g / 15 mm under heat sealing conditions of a temperature of 200 ° C., a time of 0.5 seconds, a pressure of 0.2 MPa, and a pressurization number of 3 times. A packaging bag having a release film as a feature.

Images