JP5151555B2 - Packaging bag with release film - Google Patents

Description

  The present invention relates to a packaging bag used for packaging an article such as an electronic component that dislikes dust and dust, and relates to a packaging bag that can easily expose a clean surface by peeling and removing an outer surface peeling film.

  Precision products such as precision instruments, semiconductor products, magnetic disks, and silicon wafers are extremely disliked from being mixed with dust, dust, dust, and the like, and therefore are manufactured in a clean room with high cleanliness. Since these products are often used in a clean environment as well when they are used, they prevent dust from adhering to the product body during the distribution process, and further, remove dust adhering to the outer surface of the packaging bag. Various measures are taken in order not to bring it into a clean environment. As one of these, there is a method in which a product is packaged and shipped in a plastic film bag having a special structure.

  As a packaging bag used for this application, for example, when a protective film layer is provided on the surface of the packaging bag and the protective film layer is contaminated by transportation or the like, the contaminated protective film is brought into the clean room again. There is known a packaging bag in which the layers are peeled off so that the outermost layer can be returned to a clean state again. (Patent Document 1).

  However, this packaging bag has a problem that it is difficult to peel off the release film because the protective film layer (hereinafter referred to as the release film) and the base material layer are adhered to the entire surface.

  For example, the release film will be peeled off while containing the contents, but the bag after containing and sealing the contents will be peeled off automatically by the machine because the shape is uneven. It is difficult and must be done manually. However, peeling of the release film by hand is difficult because the release film and the base material layer are bonded over the entire surface, and the peel resistance is strong and cannot be easily peeled off. .

  This is because when peeling film is peeled off, it is necessary to peel the entire width or longitudinal direction of the bag even if the width of the peeling part is narrow and the peeling resistance is weak at the start of peeling. This is because the force necessary for peeling off increases as the size 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 width is 200 mm, a force of 260 g or more is required continuously for a certain period of time until peeling is completed. . 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 outer shape becomes complicated, an extra force may be required.

  For this reason, the release film is difficult to peel off and not only burdens the operator, but 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 In some cases, it remains in the bag and fails to perform its required function. These problems are basically caused by the fact that the entire surface of the release film and the base material layer are adhered.

In order to facilitate the peeling operation, a method of weakening the adhesive strength between the peeling film and the base material layer can be considered, but in that case, there is a possibility that the problem that the peeling film is peeled off from the base material layer in the distribution process may occur. For this reason, the adhesive strength cannot be reduced beyond a certain level.

  When the release film and the base material layer are adhered, the adhesive strength necessary to prevent the release film from being peeled off from the base material layer is a minimum value of 15 to 20 g / 15 mm width (90 ° release). However, the problem that the above-mentioned release film is difficult to peel off and burdens the operator cannot be solved.

Another problem is that when the packaging material film and the release film are adhered to the entire surface, it is difficult to attach product seals to display the product on the surface of the base material layer, making it difficult to separate the products. There was also a problem of being.
That is, the product seal is generally displayed on the outside of the package, but when the outermost layer is a release film, there is a problem that the product seal is lost at the same time as the release film is peeled 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. In view of the above, the release film that protects the packaging material film from contamination such as dust and dirt can be easily peeled off from the packaging material film, and between the packaging material film and the release film. Another object of the present invention is to provide a packaging bag containing a sheet-like material such as a product seal.

  As means for solving the above problems, the invention of claim 1 is a packaging bag in which the sealant layer of a packaging material film having a sealant layer is opposed to each other and the peripheral edge except the opening is sealed. There is a release film on both outer sides of the packaging material film, and the release film and the packaging material film are detachably bonded at the left and right peripheral edges, and are not adhered to each other at least in the storage area. The release film extends longer than the packaging material film at the peripheral portion facing the opening, and the peripheral portions are bonded by overlapping the release films. At the opening, the release film is more than the packaging material film. It is long and extends, and a sheet-like material is stored in a non-adhered space between the peeling film and the packaging material film. Film is a packaging bag having a.

  In the invention of claim 2, the packaging material film has 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, Is a packaging bag having a release film according to claim 1, which is made of a heat-fusible resin.

  The invention of claim 3 is characterized in that the packaging material film has an intermediate layer between a base material layer made of a biaxially stretched plastic film and a sealant layer made of a polyolefin resin. It is a packaging bag which has a peeling film of description.

The packaging bag of the present invention is a packaging bag in which the sealant layers of the packaging material film having a sealant layer are opposed to each other and the peripheral edge except the opening is sealed, and the release material is provided on both outer surfaces of the packaging material film. However, since the release film and the packaging material film are not bonded to each other at least in the storage portion in the portions other than the left and right peripheral portions, and are attached to the left and right peripheral portions so as to be peelable, the product is enclosed and sealed. In order to bring the packaged body into a clean environment, the work of peeling off and removing the outermost release film to which dust has adhered can be performed extremely easily.

  In the packaging body of the present invention, the release film is extended longer than the packaging material film at the peripheral edge facing the opening, and the release films are overlapped and bonded at the peripheral edge. When removing the film, the extended unsealed portion is cut with a scissors or the like, so that the peeled films on the front and back sides are separated, so that a trigger for peeling can be easily obtained.

Further, before enclosing the contents, insert a sheet-like material such as a seal or card for product classification between the release film and the packaging material film, and simultaneously seal the inner layer of the release film and the packaging material film when enclosing the contents. By adhering the base material layer so as to be peelable by heat sealing or the like, the sheet-like material is stored in an unadhered space between the packaging material film and the peeling film, so that the sheet-like material is lost. It is possible to ensure product management.
Moreover, since the packaging material film is an opaque material, the sheet-like material stored between the packaging material film and the release film is visually visible even when the contents cannot be visually confirmed. Can be confirmed.

Next, when the packaging material film has a base material layer made of a biaxially stretched plastic film and a sealant layer made of a polyolefin resin, the biaxially stretched plastic film has a tear strength, a shielding property, and other packaging bags. The basic performance can be shared, and the overall performance as a packaging bag can be fully exhibited in a form in which the sealant layer shares sealing strength, sealing performance, sealing workability, and the like.
Furthermore, when an intermediate layer is provided between a base material layer made of a biaxially stretched plastic film and a sealant layer made of a polyolefin resin, various special types required as packaging materials depending on the contents. It is possible to respond precisely to the required quality.

  Moreover, when the release film has an outer layer and an inner layer, and the inner layer is made of a heat-fusible resin, the heat-sealing resin layer of the inner layer ensures heat sealing workability in the bag making process and the product sealing process, As the outer layer, there is an effect that a material that can meet various required qualities required as the outermost layer of the package in which the product is sealed can be selected.

The packaging bag which has the peeling film which concerns on this invention is demonstrated in detail based on drawing. FIG. 1 is an explanatory plan view showing a state in which contents are inserted into a packaging bag according to the present invention. The state in which the contents 6 and the sheet-like material 5 are inserted into the packaging bag 1 is shown before the opening is sealed.
FIG. 2 is an explanatory view showing a cross section AA ′ of FIG.
FIG. 3 is an explanatory cross-sectional view showing an example of the layer structure of the film constituting the packaging bag according to the present invention. The packaging bag 1 of the present invention is a packaging bag in which the sealant layers of the packaging material film 12 having a sealant layer are opposed to each other and the peripheral portions 21 and 22 except for the openings 4 are sealed. The release film 11 is provided on both outer surfaces, and the release film 11 and the packaging material film 12 are not bonded to each other at least in the storage portion except for the left and right peripheral edge portions 21.

  The release film 11 and the packaging material film 12 are detachably bonded at the left and right peripheral edge portions 21. Note that the sealant layers of the packaging material film 12 are also bonded to the left and right peripheral edge portions 21. Further, the sealant layers of the packaging material film 12 are bonded to each other at the peripheral edge 22 that faces the opening 4. The packaging material film 12 and the release film 11 may be detachably bonded, but are preferably not bonded.

In the peripheral portion 22, the release film is extended longer than the packaging material film 12 (the portion 7 where the release film is extended), and in the extended release film 7, the release films are overlapped with each other. Has been glued. The unsealed portion 9 where the extended release films are not adhered to each other is for making it easy to obtain a trigger for peeling by cutting the release film at the cut position 40 when removing the release film, Although it is desirable to have a width of about 10 mm, it is not particularly limited.
The peripheral portion 23 forms an opening 4 for enclosing the contents 6, and the release film 11 and the packaging material film 12 are not adhered to the peripheral portion 23 before the contents 6 are encapsulated. Since it is in a state, at this stage, the sheet-like material 5 such as a product label indicating the attribute of the contents can be inserted into the non-adhered space between the release film 11 and the packaging material film 12.

  After inserting the sheet-like material 5, the peripheral portion 23 is lightly heat-sealed, and the packaging material films are not bonded, but the packaging material film and the release film are temporarily attached. This is effective for facilitating insertion of the sheet 6 and preventing the sheet-like material from dropping or losing.

  Finally, the package 6 is completed by inserting the contents 6 from the opening 4 and heat-sealing the peripheral edge 23. In the peripheral portion 23 after heat sealing, the sealant layers are bonded to each other in the packaging material film, and the packaging material film and the release film are in a state of being detachably bonded in the same manner as the peripheral portion 21. At this time, the release film 8 extended at the peripheral edge 23 may be heat-sealed at the same time to bond the release films together.

The package in which the contents 6 are sealed as described above and the opening 4 is sealed is transported to the user, and the release film is peeled and removed immediately before being brought into the user's clean environment. When the release film is peeled, if the cut position 40 of the unsealed portion 9 of the portion 7 where the release film is extended is cut with a cutter or the like, the surface where the packaging material film and the release film are not bonded is immediately exposed. Therefore, it can be easily removed by holding the release film and pulling it.
Further, when the release film extended to the opening side is not adhered, the extended film 8 can be held and the release film can be removed from the opposite side, so that the release operation is further facilitated. It has the effect.

Next, the film which comprises the packaging bag based on this invention is demonstrated.
As a packaging material film, it is an essential condition to have a sealant layer and is not particularly limited as long as it is a film having a heat-sealable sealant layer that is generally used as a packaging material. In view of various required qualities required for a typical packaging bag, a biaxially stretched plastic film is preferably used as the base material layer for holding the sealant layer. As the release film, a protective film generally used for protecting the surface of an article can be used. Examples thereof include a pressure-sensitive adhesive protective film in which an adhesive layer is provided on the back surface of various films, and a base film. A heat-sensitive surface protective film having a heat-fusible resin layer provided on the back surface of the material layer can be mentioned, and the type most suitable for use in the present invention is a type having a heat-fusing resin layer.

FIG. 3 is a cross-sectional explanatory view showing an example of a layer structure of a film constituting the packaging bag according to the present invention. The release film 11 has an outer layer 15 and an inner layer 16, and the packaging material film 12 has a base material layer 13 and a sealant layer 14.
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, and the inner layer 16 of the release film 11 is composed of a heat-meltable resin layer. . As the heat-meltable resin, 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, a biaxially stretched plastic film is preferably used. Examples of the biaxially stretched plastic film include films such as a biaxially stretched polypropylene film, a biaxially stretched polyester film, and a biaxially stretched nylon film. Among these, a biaxially stretched nylon film is most preferably used. As the sealant layer 14, a polyolefin-based resin is preferable, and a polyolefin-based resin film such as polyethylene, polypropylene, and linear low-density polyethylene can be preferably used in the same manner as the inner layer 16 of the release film.

If necessary, between the base material layer 13 and the sealant layer 14 of the packaging material film, from a biaxially stretched polypropylene film, a biaxially stretched polyester film, a biaxially stretched nylon film, an aluminum foil, or a composite film thereof. An intermediate layer can also be provided. The film and metal foil constituting the intermediate layer are appropriately selected and used in combination in order to satisfy various performances required for the packaging material film depending on the contents.
For example, when an aluminum foil is used, it is possible to impart performances such as a light shielding property that protects the contents from ultraviolet rays and visible light, a gas barrier property, and an antistatic property.

  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. Moreover, 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, an example of the process of making a packaging bag having the release film according to the present invention will be described. In FIG. 1, the direction of line AA ′ is the flow direction of the raw material film. First, the front and back two packaging material films or one packaging material film is folded and overlapped so that the sealant layers face each other, and the peripheral edge portion 22 is heat-sealed. Next, either two release films from the outside or one release film is folded with the inner layer as the inner side so that the base material layer of the packaging material film and the inner layer of the release film are in contact with each other, and the peripheral portion 21 is When heat-sealed, the sealant layers of the packaging material film adhere to each other, and the base material layer of the packaging material film and the inner layer of the release film adhere to each other in a peelable manner. Next, the peripheral edge 24 is heat-sealed, and the packaging bag 1 is completed when the sheet-like material 5 is inserted into the space between the packaging material film and the release film from the opening 4 portion.

  When the peripheral portion 23 is heat-sealed after the contents 6 are inserted, the sealant layers of the packaging material film adhere to each other, and the base material layer of the packaging material film and the inner layer of the release film adhere to each other in a peelable manner. As described above, the contents 6 are sealed in the packaging material film, the four peripheral portions are sealed, and the packaging body covered with the release film from the outside is completed. A sheet-like material is accommodated in the space between the packaging material film and the release film.

In producing the packaging bag of the present invention, it is essential to carry out in a clean environment as much as possible in order to prevent the adhesion of dust in the bag making process. As a matter of course, the outer surface of the packaging material film must be clean as well as the inner surface of the packaging material film that finally comes into contact with the contents. Therefore, the inner surface of the release film that contacts the outer surface of the packaging material film must also be clean.
In manufacturing the packaging bag of the present invention, sufficient management is required to prevent the adhesion of dust from the manufacturing stage of the raw material film.

In addition, although it is about the sheet-like material which is a feature of the packaging bag having the release film according to the present invention, naturally, since this sheet-like material also requires cleanliness, paper dust is usually generated. Paper cannot be used.
In the case of paper, use clean paper that has been treated to prevent generation of paper dust so that it can be used in a clean room. Preferably, materials that do not generate dust such as synthetic paper should be selected.
In addition, on the back of the sheet-like material, by applying an adhesive process, after the release film is peeled and removed, the sheet-like material remains on the surface of the packaging material film, and the attributes of the contents are displayed. The target function can be exhibited. Note that the sheet-like material is not necessarily a single sheet, and may be a folded state or a booklet shape.
Hereinafter, based on an Example, the packaging bag which has a peeling film of this invention is demonstrated more concretely.

4 is a cross-sectional explanatory view showing the layer structure of the film used in the packaging bag of Example 1. FIG. As the release film 11, a 12 μm-thick biaxially stretched polypropylene film serving as the outer layer 15 and a 40 μm-thick polyethylene film (MFR: 2, melting point: 110 ° C.) serving as the inner layer 16 are disposed via an adhesive layer 17 made of molten polyethylene. A release film 11 having a three-layer structure comprising biaxially stretched polypropylene film (thickness 12 μm) / polyethylene (thickness 15 μm) / polyethylene film (thickness 40 μm) was prepared. The outer surface of the inner polyethylene film, that is, the surface in contact with the packaging material film, was subjected to corona discharge treatment.
The MFR (melt flow rate) was measured according to JIS K7210, and the melting point was measured according to JIS K7121.

Next, a biaxially stretched nylon film prepared by a tubular method having a thickness of 15 μm is used as the base material layer 13, and a 7 μm aluminum foil 19 and a biaxially stretched nylon film prepared by a tubular method having a thickness of 15 μm are used as the intermediate layer 30. 31 is bonded by a dry laminating method through a two-component reactive polyester resin adhesive 18, and similarly by a dry laminating method through a two-component reactive polyester resin adhesive 18, A low-density polyethylene film having a thickness of 80 μm to be the sealant layer 14 was bonded by a dry lamination method through a two-component reactive polyester resin adhesive. 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 80 μm) A packaging material film 12 having the structure was produced.
The biaxially stretched nylon film surface on the side in contact with the release film 11 was an untreated surface that was not subjected to surface treatment such as corona discharge.

  The two sealant layers were drawn out from the winding of the two packaging material films cut to a width of 390 mm, and the portions corresponding to the peripheral portion 22 in FIG. 5 were heat sealed and bonded. Next, two release films cut to a width of 415 mm on both the outer surfaces were drawn out from the unwinding and overlapped so that the inner layer was on the inner side, and the peripheral edge portion 21 was heat sealed. At this time, the release film was set to extend 10 mm at the peripheral edge 25 and 15 mm at the peripheral edge 22 rather than the packaging material film. Next, the peripheral edge 24 of the extended release film was heat-sealed over a width of 5 mm.

Next, a product label is inserted from the portion of the peripheral portion 23 where the packaging material film and the release film are not bonded, and the peripheral portion 23 is lightly heat-sealed to a width of 1 cm, and the release film and the packaging material film are temporarily attached. I let you. At this time, heat seal conditions were set so that the sealant layers of the packaging material film would not adhere. The back surface of the product label sheet was previously subjected to adhesive processing. When the packaging bag connected last was cut off at the peripheral portion 21 at intervals of 270 mm, the packaging bag 1 having the intended release film was obtained.

  The polyethylene surface (corona discharge-treated surface) of the release film 11 and the untreated nylon film surface of the packaging material film 12 are bonded by a heat seal heating so that hydrogen bonds and covalent bonds such as hydroxyl groups and carboxyl groups of the film surface are generated and can be peeled off. It is thought to do.

Holding the extended release film 8 of the packaging bag having the release film thus obtained, the opening 4 is opened, the electronic component as the contents 6 is inserted, and the peripheral portion 23 is heat-sealed to form a package. completed.
The above steps were all performed in a clean room to prevent dust from adhering to the packaging bag.

  When the package obtained as described above was carried into the user's clean room, the outer release film was removed. When the unsealed portion 9 of the extended portion 7 of the release film was cut with a cutter, the release film was not bonded to the packaging material film, and thus could be easily peeled off. Since the product label sheet was adhered to the packaging material film, it did not fall.

Plane explanatory drawing which shows the state which inserted the content in the packaging bag which concerns on this invention. Explanatory drawing which showed the AA 'cross section of FIG. Cross-sectional explanatory drawing which shows an example of the layer structure of the film which comprises the packaging bag which concerns on this invention. Cross-sectional explanatory drawing which shows the layer structure of the film which comprises the packaging bag shown in the Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Packaging bag 21-24 ... Peripheral part 3 ... Storage part 4 ... Opening part 5 ... Sheet-like thing 6 ... Contents 7 ... Release film was extended Part 8 ... Part 9 where the release film is extended ... Unsealed part 11 ... Release film 12 ... Packaging material film 13 ... Base material layer 14 ... Sealant layer 15 ... Outer layer 16 ... Inner layer 17 ... Adhesive layer 18 ... Adhesive 19 ... Aluminum foil 30 ... Intermediate layer 31 ... Nylon film 40 ... Cut position

Claims (3)

  A packaging bag in which a sealant layer of a packaging material film having a sealant layer is opposed to each other, and a peripheral portion excluding an opening is sealed, and has a release film on both outer surfaces of the packaging material film, and the release film and the packaging material The film is detachably bonded to the left and right peripheral parts, and is not adhered to each other at least in the storage part at other parts, and the release film is longer than the packaging material film at the peripheral part facing the opening. In the opening, the release film is overlapped and bonded to each other, and the release film is extended longer than the packaging material film in the opening, and the adhesion between the release film and the packaging material film is extended. A packaging bag having a release film, characterized in that a sheet-like material is accommodated in a non-working space.   The packaging material film has a base material layer made of a biaxially stretched plastic film and a sealant layer made of a polyolefin resin, the release film has an outer layer and an inner layer, and the inner layer is made of a heat-fusible resin. A packaging bag having a release film according to claim 1.   The packaging material having a release film according to claim 2, wherein the packaging material film has an intermediate layer between a base material layer made of a biaxially stretched plastic film and a sealant layer made of a polyolefin resin. bag.