JP2014015244A - Resealable bag body, and article comprising the bag body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resealable bag body which can be easily re-unsealed by finger tips and can be easily determined whether it is a bag body which has never been unsealed or it is a resealed bag body after being unsealed, and to provide an article comprising the bag body.SOLUTION: A bag body 10 is constituted of a tube part 14 which is formed of a resin film comprising a base material layer and a heat fusion layer, and of which at least one end part is closed by heat-sealing the heat fusion layer. It comprises: a non-sealing part 21 which is formed adjacently to a sealing part 20a subjected to the heat-sealing; and a resealing part 22 which is formed adjacently to the non-sealing part 21. The resealing part 22 has an adhesive layer formed on a surface of the heat fusion layer. The non-sealing part 21 has an unsealing starting part 30 which becomes a starting point of unsealing of the bag body 10.

Description

  The present invention relates to a resealable bag body that can be sealed again after opening, and an article provided with the bag body.

2. Description of the Related Art As a resin film bag body that can be sealed again after a part of contents such as food is taken out, one in which a fastener is attached to the opening of the bag body is known. However, the process of attaching the fastener to the bag is complicated and the manufacturing cost is high, and therefore, a bag having a resealing function as an alternative is being studied.
For example, Patent Document 1 discloses a bag made of a laminate in which a base material layer and a heat-adhesive resin layer are laminated via an adhesive layer as a bag body that can be sealed again without using a fastener. The body is disclosed. In this bag, when the end of the bag closed by the heat-adhesive resin layer is peeled off and opened, the pressure-sensitive adhesive layer is exposed, and the once-opened end can be resealed by this pressure-sensitive adhesive layer. It is like that.

JP 2003-63539 A

However, the bag described in Patent Document 1 has a problem that it is difficult to re-seal.
In addition, with this bag body, it is not easy to understand whether the bag body is unopened or has been resealed after it has been opened once by just looking at the end of the bag body in the closed state. It was.

  The present invention has been made in view of the above circumstances, can be easily reopened with a fingertip, and discriminates whether it is an unopened bag or a bag that has been opened once and then resealed It is an object of the present invention to provide a resealable bag body that is easy to perform and an article including the bag body.

The present invention has the following configuration.
[1] A bag body in which at least one end of a cylindrical portion formed of a resin film provided with a base material layer and a heat sealing layer is closed by heat sealing of the heat sealing layer,
A non-seal part formed adjacent to the heat-sealed seal part, and a reseal part formed adjacent to the non-seal part,
In the reseal portion, an adhesive layer is formed on the surface of the heat-fusible layer,
The non-sealable portion is a resealable bag body in which an opening start portion serving as a starting point for opening the bag body is formed.
[2] The resealable bag according to [1], wherein the opening start portion is formed by roughening.
[3] An article comprising the bag according to [1] or [2] and the contents stored in the bag.

  The resealable bag according to the present invention can be easily re-sealed with a fingertip, and can easily determine whether it is an unopened bag or a bag that has been resealed after being opened once. .

It is a perspective view which shows the confectionery product in which the confectionery was accommodated in the resealable bag which is an example of this invention. It is sectional drawing which follows the I-I 'line of the bag body (unopened) of FIG. It is sectional drawing which shows the state which opened the bag body of FIG. It is sectional drawing which shows the state which resealed the bag body opened like FIG. It is the elements on larger scale which expanded the principal part of FIG.

Hereinafter, the present invention will be described in detail.
FIG. 1 shows an article (for example, a biscuit, a cookie, a rice cracker, etc.) (not shown) housed in the bag 10 and a resealable bag 10 which is an example of the present invention. It is a perspective view which shows a confectionery product. FIG. 2 is a cross-sectional view taken along the line II ′ of the bag body 10 of FIG.

In the bag 10 of this example, as shown in FIG. 2, the resin film 13 having a two-layer structure composed of a base material layer 11 and a heat seal layer (sealant layer) 12 is disposed inside the heat seal layer 12. In this way, the heat sealing layers 12 facing each other are heat sealed at both end portions of the formed cylindrical portion 14 to form seal portions 20a and 20b.
In addition, although the bag body 10 of this example is what is called a back pasting bag (pillow bag) which has a back pasting part along the axial direction of the cylinder part 14, illustration of the back pasting part is abbreviate | omitted in drawing.

  In the bag body 10 of this example, a non-seal part 21 is formed adjacent to the seal part 20 a at one end of the cylindrical part 14, and a reseal part 22 is formed adjacent to the non-seal part 21. As shown in FIG. 1, all of the seal portions 20a, 20b, the non-seal portion 21, and the reseal portion 22 are in a direction perpendicular to the axis of the cylindrical portion 14 (hereinafter, this direction is referred to as a width direction). Are formed in parallel so as to extend in a strip shape.

Here, the sealing portions 20a and 20b are portions that are heat-sealed by being heat-sealed by the heat-seal layers 12 facing each other being heated by a heat-seal bar or the like and closed.
The non-seal portion 21 is a portion where the opposing heat sealing layers 12 are not heated and are not sealed.

The reseal portion 22 is a portion that imparts adhesiveness to each surface of the opposing heat-sealing layer 12 and allows the adhesive and peeling to be repeated a plurality of times by this adhesiveness. This is a portion where re-adhesion) and re-sealing (re-peeling) are possible. In addition, the surface of the heat sealing | fusion layer 12 is an outer surface of the side in which the base material layer 11 does not exist in the heat sealing | fusion layer 12. FIG.
In this example, pressure-sensitive adhesive layers 22a and 22b made of a heat-sensitive adhesive are formed on each surface of the heat-sealing layer 12 facing each other in the reseal portion 22, thereby imparting adhesiveness, and pressure-sensitive adhesive layers 22a and 22b. Re-sealing, re-sealing, that is, resealing is possible. Here, the pressure-sensitive adhesive layers 22a and 22b are formed on both surfaces of the opposing heat-sealing layer 12 in this way to impart adhesiveness. However, resealing and re-sealing are possible. For example, the pressure-sensitive adhesive layer may be formed only on one surface of the heat-sealing layer, and the adhesiveness may be imparted only to the surface.

At one end portion in the width direction of the non-sealed portion 21 of the bag body 10 in this example, an opening start portion 30 that is a starting point when the unopened bag body 10 is opened is formed. Starting from the opening start portion 30, the non-sealed portion 21 of the bag body 10 is broken from one end portion in the width direction toward the other end portion, and the seal portion 20 a is separated from the bag body 10, thereby unopened bag body 10 can be opened.
If the opening start part 30 is processed so that the bag body 10 may be torn from here, the specific form is not limited and may be a notch, but is preferably formed by roughening. . The rough surface processing is, for example, a method of forming a large number of fine through holes, slits, perforations, or the like at a corresponding portion of the non-seal portion 21 with a needle, laser light, or a cutting tool, or roughening means such as sandpaper. Thus, at least the surface of the base material layer 11 can be roughened by a method such as a method of forming fine scratches on the surface. In the case of forming a notch, a method of forming a notch such as an I-shape, a U-shape, a turtle shell shape, etc. at the location after partially sealing only the target location where the notch is to be formed in the non-sealed portion is suitable. . In addition, when the bag body 10 is a back pasting bag like the example of illustration, it is preferable to give a rough surface process etc. also to the corresponding location in a back pasting part, and to provide opening ease.

Next, a method of opening the unopened bag body 10 of FIG. 2 and taking out a part of the contents from the bag body 10 and then resealing and resealing will be described.
First, when opening the unopened bag 10, the unsealed portion 21 is torn to the other end in the width direction, starting from the opening start portion 30 formed at one end in the width direction of the non-sealed portion 21. The seal part 20a is separated from the bag body 10. Then, the pressure-sensitive adhesive layers 22a and 22b adhered to the reseal portion 22 are peeled off. Thereby, as shown in FIG. 3, one edge part of the bag body 10 can be opened. In this way, by separating the non-seal part 21, the seal part 20a is separated from the bag body 10, so that a part of the non-seal part 21 is accompanied by the seal part 20a side and the remaining part remains on the bag body 10 side. To do.

Next, a part of contents such as confectionery stored in the bag 10 is taken out.
And as shown in FIG. 4, the bag body 10 can be resealed by sticking the adhesive layers 22a and 22b of the reseal part 22 together.
Thereafter, when the bag body 10 is re-sealed, as shown in an enlarged view in FIG. 5, the fingertip is inserted into the gap S between the pair of protruding pieces 21 a and 21 b formed by the non-sealed portion remaining in the bag body 10. From this point, the adhesive layers 22a and 22b are separated from each other, and the bag 10 is resealed.

Thus, since the bag body 10 of the example of illustration has the reseal part 22, the bag body 10 once opened can be resealed or it can be resealed.
Further, the bag body 10 of this example is sealed by the seal portion 20a in an unopened state, but the seal portion 20a is cut off at the first opening time. Therefore, at the time of subsequent re-sealing, sealing is performed by the reseal portion 22 formed at a location different from the seal portion 20a. Therefore, about the bag body 10 in the sealed state, it is unopened, or has a history of opening at least once, or the presence or absence of the seal portion 20a is sealed. From the location, it can be easily distinguished visually. For this reason, it is possible to prevent so-called “tampering” in which a bag with an opening history looks like an unopened bag.

Further, in the bag body 10 of this example, a non-seal part 21 is formed between the seal part 20a and the reseal part 22, and an unsealing start part 30 is formed in the non-seal part 21, When opening the unopened bag body 10, the unsealed portion 21 is guided to break from the opening start portion 30. Therefore, the unsealer divides the non-seal part 21 with the opening start part 30 as a starting point, and opens the bag body 10. When the non-seal part 21 is broken and the bag body 10 is opened, a part of the non-seal part remains in the bag body 10 as shown in FIG. 5 to form a pair of protruding pieces 21a and 21b. Is done. Therefore, a fingertip can be inserted into the gap S between the protruding pieces 21a and 21b, and the adhesive layers 22a and 22b can be easily peeled off.
Thus, when opening the unopened bag body 10, it is important to open from the opening start part 30 formed in the non-seal part 21 in terms of easy peeling of the reseal part 22. When opening the unopened bag body 10, the end of the seal portions 20a and 20b is gather-cut to promote opening from the end portion of the seal portions 20a and 20b so as to surely break the bag body 10 from the opening start portion 30. It is preferable not to form notches such as notches.

Next, the manufacturing method of the bag body 10 of this example is demonstrated.
First, as a material film for forming the bag body 10, a resin film 13 in which the heat-sealing layer 12 is formed on one side of the base material layer 11 is prepared.
The film constituting the base material layer 11 is preferably a film excellent in puncture strength, tensile strength, impact resistance, and the like. For example, a biaxial film made of a resin such as polyethylene terephthalate, polypropylene, polyamide, or ethylene-vinyl alcohol copolymer. A stretched film or a uniaxially stretched film is preferred. Since these films are excellent in printability, they are also suitable for printing on the base material layer 11 such as characters and pictures.
The film constituting the base material layer 11 may be a laminate of two or more layers of these films, for example, a multilayer film obtained by coextruding two or more kinds of resins.

  Moreover, as a film which comprises the base material layer 11, in order to provide gas barrier property, the vapor deposition by which the metal (for example, aluminum, magnesium, etc.) and the oxide (for example, silicon oxide, etc.) were vapor-deposited on the surface of the resin film. A film, a coated film in which a surface of a resin film is coated with a barrier coating agent (such as polyvinylidene chloride) may be used.

  Although the thickness of the base material layer 11 is suitably set according to the use etc. of the bag body 10, 6-50 micrometers is preferable from the point of workability and versatility, and 9-30 micrometers is more preferable.

The heat sealing layer 12 functions as a sealant layer and needs to have heat sealability. The heat fusion layer 12 is a combination of an unstretched film formed using one or more of high density polyethylene, low density polyethylene, linear low density polyethylene, polypropylene, etc., or two or more of these resins. It is preferably formed by a coextruded multilayer film.
The thickness of the heat sealing layer 12 is preferably 10 to 200 μm, and more preferably 20 to 100 μm, from the viewpoint of heat sealability.

In the illustrated example, a two-layer film composed of a base material layer 11 and a heat-sealing layer 12 is shown as the resin film 13, but if a base material layer and a heat-sealing layer are provided, these layers are interposed between them. A resin film provided with one or more intermediate layers may be used.
Examples of the intermediate layer include a layer formed of a film having functions such as oxygen barrier property, water vapor barrier property, and tearing property. As such a film, various functional films, such as metal foil, such as aluminum; the above-mentioned vapor deposition film; the above-mentioned coat film;
The thickness of the intermediate layer is appropriately set according to the thickness of the entire resin film, the use of the bag body 10, and the like, preferably 6 to 50 μm, and more preferably 9 to 30 μm.

The resin film is manufactured by a method (dry laminating method) in which a film constituting each layer described above is adhered with an adhesive, an extrusion laminating method using a thermoadhesive resin, or the like.
Moreover, when printing on the base material layer 11, before laminating | stacking the heat-fusion layer 12 and the intermediate layer provided as needed on the film which comprises the base material layer 11, Preferably the base material layer 11 of Print on the back (non-exposed) side.

Next, an adhesive is applied to the portion of the resin film 13 on the surface of the heat-sealing layer 12 that will become the reseal portion 22 after bag making, thereby forming the adhesive layers 22a and 22b.
As the pressure-sensitive adhesive, a pressure-sensitive known pressure-sensitive adhesive can be used, but a heat-sensitive pressure-sensitive adhesive that exhibits adhesiveness by heating can be particularly preferably used. Examples of such heat-sensitive adhesives include “Eco Brid (delay tack adhesive)” which is an aqueous emulsion type adhesive sold by Daicel Finechem Co., Ltd.
In order to strengthen the adhesion between the surface of the heat-sealing layer 12 and the pressure-sensitive adhesive layers 22a and 22b, at least the position where the pressure-sensitive adhesive layers 22a and 22b are formed on the surface of the heat-bonding layer 12 in advance. You may give surface treatments, such as a corona treatment.

Since the heat-sensitive adhesive does not exhibit adhesiveness unless heated, simply applying the heat-sensitive adhesive on the surface of the heat-fusible layer 12 to form the pressure-sensitive adhesive layers 22a and 22b does not have stickiness and is not sticky. Therefore, when the heat-sensitive adhesive is used, the workability in the subsequent manufacturing process of the bag body 10 is excellent.
In addition, when a pressure-sensitive adhesive that exhibits adhesive properties immediately after coating is used, the adhesive is applied only to the portion corresponding to the reseal portion 22 on the surface of the heat-sealing layer 12. It is necessary to form the pressure-sensitive adhesive layers 22a and 22b. That is, it is necessary to strictly control the adhesive application position. On the other hand, in the case of a heat-sensitive adhesive, since it is possible to exert adhesiveness only on the heated portion after coating, heat fusion is performed so that at least a portion corresponding to the reseal portion 22 is included. It is also possible to spread the heat-sensitive adhesive on the surface of the layer 12 and then heat only the part of the heat-sensitive adhesive corresponding to the reseal part 22 to exhibit the adhesiveness only on that part. . When the heat-sensitive adhesive is used as described above, it is not necessary to strictly control the coating position.

After the pressure-sensitive adhesive layers 22a and 22b are thus provided at predetermined positions, the resin film 13 is formed into a cylindrical shape so that the heat-sealing layer 12 is on the inside, heat-sealed (vertically sealed), and the back-pasted portion is The cylindrical part 14 is formed by forming. And among the both ends of the formed cylinder part 14, the edge part by which the adhesive layer 22a, 22b is not formed in the vicinity is heat-sealed (horizontal seal), it obstruct | occludes, and the seal | sticker part 20b is formed. Sealing means such as a heat seal bar is used for heat sealing.
Next, after the confectionery is stored in the bag body 10 from the opposite end (the open end), the end is heat sealed (horizontal seal) and closed to form the seal portion 20a. To do.
Here, when the pressure-sensitive adhesive layers 22a and 22b are formed of a heat-sensitive pressure-sensitive adhesive, the portion corresponding to the reseal portion 22 is heated by applying a heat seal bar or the like to develop adhesiveness.
And in the non-seal part 21 between the seal part 20a and the reseal part 22, the opening start part 30 is formed by giving a rough surface process etc. to the one side part of the width direction.
Thereby, the confectionery product provided with the resealable bag 10 shown in FIG. 1 and the confectionery (not shown) stored in the bag 10 can be manufactured.

As described above, since the bag body 10 has the reseal portion 22, it can repeat resealing and resealing. Therefore, it is suitable for the purpose of storing food, taking out a part of it, eating it, and resealing it.
Moreover, since the bag body 10 of this example differs in the presence or absence of the seal part 20a and the location where the seal is made between when unopened and when it is re-sealed, whether the bag body 10 is unopened or has an opening history It can be easily determined visually whether it has been resealed. Therefore, it is possible to prevent “tampering” that makes a bag with an opening history appear to be unopened.

  Further, in the bag body 10 of this example, a non-seal part 21 is formed between the seal part 20 a and the reseal part 22, and an unsealing start part 30 is formed in the non-seal part 21. Therefore, when opening the unopened bag body 10, the unsealer divides the non-seal portion 21 from the opening start portion 30 and opens the unopened bag body 10. As a result, a pair of protruding pieces 21a and 21b are formed on the bag body 10 by a part of the non-sealed portion, and the adhesive layers 22a and 22b of the resealed portion 22 can be easily started from the protruding pieces 21a and 21b. They can be peeled apart and opened.

In the illustrated bag body 10, both end portions of the cylindrical portion 14 have seal portions 20a and 20b, and a non-seal portion 21 and a reseal portion 22 are sequentially formed adjacent to one of the seal portions 20a. However, if necessary, the non-seal part and the reseal part may be formed so as to be adjacent to both the seal parts 20a and 20b.
In addition, as long as at least one end of the cylindrical portion is closed by heat sealing, the other end is not limited to being closed by heat sealing.
Moreover, although the bag body 10 in the illustrated example is a back-attached bag (pillow bag), it may be a three-sided bag or the like in which a resin film is folded and the edges of three overlapping sides are bonded together. There is no limit.

  Further, in the above-described example, food such as confectionery is illustrated as the content stored in the bag body 10, but the content is not limited to food, and may be, for example, stationery, daily necessities, or household goods.

DESCRIPTION OF SYMBOLS 10 Bag body 11 Base material layer 12 Heat-fusion layer 13 Resin film 14 Tube part 20a, 20b Seal part 21 Non-seal part 22 Reseal part 22a, 22b Adhesive layer 30 Opening start part

Claims (3)

At least one end of a cylindrical portion formed of a resin film provided with a base material layer and a heat fusion layer is a bag that is closed by heat sealing of the heat fusion layer,
A non-seal part formed adjacent to the heat-sealed seal part, and a reseal part formed adjacent to the non-seal part,
In the reseal portion, an adhesive layer is formed on the surface of the heat-fusible layer,
The non-sealable portion is a resealable bag body in which an opening start portion serving as a starting point for opening the bag body is formed.   The said opening start part is a resealable bag body of Claim 1 currently formed by the roughening process.   An article comprising the bag according to claim 1 and the contents stored in the bag.

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