JP2007145347A - Packaging bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To re-seal a bag with a high re-adhesive strength even after repeating a seal opening and a re-sealing operation. <P>SOLUTION: A front surface film 1 and a rear surface film 2 are heat-sealed at their three sides. The upper part of the front surface film 1 is provided with a folding line extending in a lateral direction, and the inner surface higher than the folding line is provided with a re-sealing tape 3. Then, the re-sealing tape 3 is constituted by laminating a seal layer 31, an adhesive agent layer 32 and a peeling protection film 33 in this order, the peeling protection film 33 is peeled and removed and the exposed adhesive agent layer 32 is adhered to make a sealed state and then both seal opening and re-sealing of high re-adhering strength can be attained. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a packaging bag that can be repeatedly opened and resealed.

  As this type of packaging bag, for example, a film in which a tape is bonded to the inner surface of one of two films constituting the packaging bag and the surface of the tape is formed of an adhesive layer is known ( Patent Document 1). In this packaging bag, once opened, the pressure-sensitive adhesive layer can be adhered to the opposite film and resealed. However, when opening, you must put your finger between the film and peel it off. This finger comes into contact with the adhesive layer and the peeled state does not become uniform, so it is necessary to reseal There was a drawback that it was difficult to obtain a good re-adhesion strength.

Moreover, what comprised the film which comprises a packaging bag by three layers, a surface resin layer, an adhesive layer, and a heat-sealable resin layer, and comprised the packaging bag with this film is also known (refer patent document 2). In this packaging bag, at the time of opening, the heat-sealable resin layer is broken and peeled between the pressure-sensitive adhesive layer and the heat-sealable resin layer to expose the pressure-sensitive adhesive layer. And it can reseal with this exposed adhesive layer. However, this packaging bag has a problem that its re-adhesion strength is low because the pressure-sensitive adhesive layer is adhered to a heat-sealable resin layer which is different from this when resealed.
JP 2004-122374 A JP 2004-58568 A

  Accordingly, an object of the present invention is to provide a packaging bag that can be resealed with high re-adhesion strength even after repeated opening and resealing.

  By the way, the present inventor can re-seal with high re-adhesion strength when the inner surface of the packaging bag at the time of opening is composed of a pressure-sensitive adhesive layer. Although the re-adhesion strength decreases, it has been discovered that it can be maintained in a higher state than before. The present invention has been made based on such a technical background.

That is, the invention according to claim 1 is a bag body composed of front and back films which are overlapped with each other and closely attached to each other;
A re-sealable packaging bag comprising a resealable tape bonded to each of the inner surfaces of the front and back films at the opening of the bag,
The tape is composed of a seal layer that adheres to the front film or the back film, an adhesive layer, and a release protective film,
When the release protective film is peeled off, the pressure-sensitive adhesive layer is a packaging bag facing each other.

  In the invention according to claim 2, the tape is composed of a single tape, one of which is bonded to the inner surface of the front film through the fold, and the other is bonded to the back film. It is a packaging bag.

The invention according to claim 3 is a bag body composed of front and back films which are overlapped with each other and closely attached to each other.
A re-sealable packaging bag comprising a resealable tape adhered to the inner surface of the front film or the back film at the position of the opening of the bag,
The tape is configured by sequentially laminating a sealing layer, an adhesive layer, a sealing resin layer, and a base film that adhere to the front side film or the back side film,
It is a packaging bag from which the pressure-sensitive adhesive layer is agglomerated and peeled when opened.

  The invention according to claim 4 is the packaging bag according to any one of claims 1 to 3, wherein the pressure-sensitive adhesive layer is mainly composed of a hydrogenated product of a styrene-butadiene block copolymer. .

  Further, the invention according to claim 5 is the packaging bag according to any one of claims 1 to 3, wherein the pressure-sensitive adhesive layer comprises the amorphous polyolefin as a main component.

  In the invention which concerns on Claim 1, since the tape is adhere | attached on the inner surface of the film of the front and back, respectively, when the peeling protection film of this tape is peeled, since the said adhesive layers face each other, It is possible to obtain a high re-adhesion strength by adhering the pressure-sensitive adhesive layers together. Moreover, although the re-adhesion strength is reduced by repeated opening and resealing, it can be maintained in a relatively high state.

  Moreover, in the invention which concerns on Claim 3, the tape for resealing is adhere | attached on the inner surface of either one of the front and back films, The heat seal resin layer which peeled and exposed the base film of this tape Can be sealed to the opposite film by sealing the packaging bag. And when opening this packaging bag, the pressure-sensitive adhesive layer of the tape is agglomerated and peeled, and this pressure-sensitive adhesive layer is exposed on both sides of the opening surface. High re-adhesion strength can be obtained. Moreover, although the re-adhesion strength is reduced by repeated opening and resealing, it can be maintained in a relatively high state.

  Next, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 of the drawings is a perspective view of the packaging bag according to the first embodiment. In this packaging bag, the front film 1 and the back film 2 are heat-sealed in three directions, and the remaining one is used as an opening a. In the figure, b is a heat seal part. In this example, a four-side sealed bag is illustrated, but a three-side sealed bag may of course be used.

  And this packaging bag is equipped with the tape 3 for resealing on the inner surface of an upper area | region. The resealable tape 3 is formed by laminating a seal layer 31, an adhesive layer 32, and a peeling protective film 33 in this order as shown in the cross-sectional view of the main part of FIG. One region sandwiching the crease l is adhered to the front film 1 and the other region is adhered to the back film 2. The resealable tape 3 is bonded to the front film 1 and the back film 2 by heat-sealing the sealing layer 31 to the front film 1 and the back film 2, respectively. The heat seal portion b is provided up to the lower end portion of the resealable tape 3, that is, the position of the crease l.

  The packaging bag first bends the front film 1 and then peels and removes the peeling protective film 33 to expose the pressure-sensitive adhesive layer 32 (see FIG. 3), and bonds the pressure-sensitive adhesive layers 32 facing each other. It can seal by doing. When opening, the adhesive layer 32 and the adhesive layer 32 are peeled off from the boundary surface, and the adhesive layer 32 and the seal layer 31 are broken from the crease l and opened (see FIG. 4). . This sealing and resealing can be performed repeatedly.

  Next, FIG. 5 is a perspective view showing a second embodiment of the present invention. In this packaging bag, the front film 1 and the back film 2 are heat-sealed in three directions, and the remaining one is used as an opening a. In the figure, b is a heat seal part. In this example, a four-side sealed bag is illustrated, but a three-side sealed bag may of course be used.

  And this packaging bag is equipped with the tape 4 for resealing on the inner surface of an upper area | region. The resealable tape 4 is configured by sequentially laminating a sealing layer 41, an adhesive layer 42, a sealing resin layer 43, and a base film 44 adhered to the front film 1 as shown in the cross-sectional view of the main part in FIG. Has been.

  This packaging bag can be sealed by first peeling off the base film 44 to expose the sealing resin layer 43 and heat-sealing the sealing resin layer 43 to the back film 2 (see FIG. 7). Then, when opening, the pressure-sensitive adhesive layer 42 is internally destroyed to be agglomerated and peeled (see FIG. 8). Due to this cohesive peeling, a part of the pressure-sensitive adhesive layer 42 is transferred to the back film 2 and the remaining part is left on the front film 1, so that both surfaces can be resealed by pressing. In addition, this sealing and resealing can be performed repeatedly.

  As the pressure-sensitive adhesive layers 32 and 42, for example, those having a hydrogenated product of a styrene-butadiene block copolymer as a main component can be preferably used. For example, a pressure-sensitive adhesive obtained by adding a tackifier to a hydrogenated product of a styrene-butadiene block copolymer. As the tackifier, rosin resins such as natural resin rosin, polymerized rosin, hydrogenated rosin, glycerinster rosin, and pentaerythritol can be used. Further, terpene resins such as terpenes, aromatic modified terpenes, terpene phenols, and hydrogenated terpenes can be used as a tackifier. Also, petroleum resins such as aliphatic petroleum resins, aromatic petroleum resins and hydrogenated alicyclic petroleum resins can be used as a tackifier.

  Further, as the pressure-sensitive adhesive layers 32 and 42, a styrene-butadiene block copolymer hydrogenated product added with a tackifier and further added with a third component may be used. For example, thermoplastic resins such as polyolefin, softeners, oils, stabilizers, liquid paraffin, and the like.

  In addition, as the adhesive layers 32 and 42, those having amorphous polyolefin as a main component can be used. For example, amorphous polypropylene such as propylene-butene-1 copolymer.

  Moreover, as the sealing layers 31 and 41 and the sealing resin layer 43, low density polyethylene, an ethylene-butene-1 copolymer, etc. can be utilized.

  Next, any film can be used as the peel protection film 33 and the base film 44 as long as the adhesive layer 32 can be protected until the packaging bag is sealed. For example, polyolefin films such as polyethylene, polyester films, polyvinyl chloride films, and the like.

  In addition, as the front side film 1 and the back side film 2, arbitrary plastic films can be used. Examples thereof include polyolefin films such as polyethylene, polyvinyl chloride films, polyester films, polyamide films, and the like. Or the laminated film which laminated | stacked another layer on these plastic films may be sufficient. Examples of other layers include metal foils such as aluminum foil, inorganic vapor deposition layers such as metal vapor deposition layers and aluminum oxide vapor deposition layers, and paper.

  Next, the measurement test of the adhesive strength between the heat-sealable resin layer and the pressure-sensitive adhesive layer and the adhesive strength between the pressure-sensitive adhesive layers will be described.

<Test Examples 1 to 4>
A polyester film was used as the peel protection film 33. Moreover, the following 2 types of adhesives were used as an adhesive.

Adhesive 1 (viscous-1) composition;
50% by weight of hydrogenated styrene-butadiene block copolymer
Petroleum resin 20% by weight
Polyethylene 30% by weight
Adhesive 2 (viscous-2) composition;
95% by weight of propylene-butene-1 copolymer
Additive 5 wt%
Further, polyethylene was used as the seal layer 31.

  Then, an adhesive layer and a seal layer were formed on the polyester film using a coextrusion coating method to obtain a tape.

  And after peeling-removing the peeling protection film 33, the adhesive layers were adhere | attached and the adhesive strength was measured. Next, the pressure-sensitive adhesive layers were once bonded to each other and then peeled off and rebonded to measure the adhesive strength. Adhesion and peeling were repeated, and the adhesive strength was measured until the fourth re-adhesion.

  Moreover, the adhesive layer and the sealing layer 31 were bonded together, and the adhesive strength was measured. As for the adhesive strength of both, adhesion and peeling were repeated, and the adhesive strength was measured until the fourth re-adhesion.

In addition, the measurement conditions of adhesive strength are as follows.
Measuring method: JIS K7127
Measuring device; tensile tester test speed; 300 mm / min
Peeling angle: 90 degrees (T type)
The results are shown in Table 1. In the table, “B / B” on the reseal surface indicates a test example in which the pressure-sensitive adhesive layers are bonded to each other and peeled, and “A / B” indicates a test in which the pressure-sensitive adhesive layer and the seal layer are bonded and peeled. An example is shown. “Initial” indicates the adhesive strength at the first bonding, “Re1” indicates the first rebonding, and “Re2” indicates the bonding strength at the first rebonding. The same applies to “Re3” and “Re4”.

＜試験例５〜６＞
基材フィルムとしてポリエステルフィルムを使用した。また、粘着剤としては、前記粘着剤−１及び粘着剤−２の２種類の粘着剤を使用した。また、シール層４１及びシール性樹脂層４３として、ポリエチレンを使用した。

<Test Examples 5-6>
A polyester film was used as the base film. Moreover, as an adhesive, the two types of adhesives of the said adhesive-1 and the adhesive-2 were used. Further, polyethylene was used as the sealing layer 41 and the sealing resin layer 43.

  And the sealing layer 41, the adhesive 42, and the sealing resin layer 43 were laminated | stacked in this order on the said polyester film using the coextrusion coating method.

Then, the pressure-sensitive adhesive 42 was internally broken and agglomerated and peeled off. The adhesive strength was measured at the time of this cohesive peeling. Next, the pressure-sensitive adhesive layers were once bonded to each other and then peeled off and re-adhered to measure the adhesive strength. Adhesion and peeling were repeated, and the adhesive strength was measured until the fourth re-adhesion. The measurement conditions are the same as in Test Examples 1 to 4. The results are shown in Table 2.

表１及び表２から分かるように、粘着剤層同士の初期接着強度は、粘着剤層とシール層との間の初期接着強度とほぼ同様であるが、接着と剥離を繰り返した場合、粘着剤層とシール層との間の接着強度は急激に低下するのに対し、粘着剤層同士の接着強度は比較的低下し難い。

As can be seen from Tables 1 and 2, the initial adhesive strength between the pressure-sensitive adhesive layers is almost the same as the initial adhesive strength between the pressure-sensitive adhesive layer and the seal layer. While the adhesive strength between the layer and the seal layer is rapidly decreased, the adhesive strength between the pressure-sensitive adhesive layers is relatively difficult to decrease.

The perspective view of the packaging bag of 1st embodiment of this invention. The principal part sectional drawing of the packaging bag of 1st embodiment of this invention. The principal part sectional drawing which shows the time of use of the packaging bag of 1st embodiment of this invention. The principal part sectional drawing which shows the time of use of the packaging bag of 1st embodiment of this invention. The perspective view of the packaging bag of 2nd embodiment of this invention. The principal part sectional drawing of the packaging bag of 2nd embodiment of this invention. The principal part sectional drawing which shows the time of use of the packaging bag of 2nd embodiment of this invention. The principal part sectional drawing which shows the time of use of the packaging bag of 2nd embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front side film 2 Back side film 3 Resealable tape 31 Seal layer 32 Adhesive layer 33 Peeling protective film 4 Resealable tape 41 Seal layer 42 Adhesive layer 43 Sealing resin layer 44 Base film a Opening part b Heat seal part l Crease

Claims (5)

A bag body consisting of front and back films that are stacked on top of each other and closely attached to each other;
A re-sealable packaging bag comprising a resealable tape bonded to each of the inner surfaces of the front and back films at the opening of the bag,
The tape is composed of a seal layer that adheres to the front film or the back film, an adhesive layer, and a release protective film,
A packaging bag in which the pressure-sensitive adhesive layers face each other when the peeling protective film is peeled off.   The packaging bag according to claim 1, wherein the tape is composed of a single tape, one of which is bonded to the inner surface of the front film through the fold, and the other is bonded to the back film. A bag body consisting of front and back films that are stacked on top of each other and closely attached to each other;
A re-sealable packaging bag comprising a resealable tape adhered to the inner surface of the front film or the back film at the position of the opening of the bag,
The tape is configured by sequentially laminating a sealing layer, an adhesive layer, a sealing resin layer, and a base film that adhere to the front side film or the back side film,
A packaging bag in which the pressure-sensitive adhesive layer is agglomerated and peeled when opened.   The packaging bag according to any one of claims 1 to 3, wherein the pressure-sensitive adhesive layer is mainly composed of a hydrogenated product of a styrene-butadiene block copolymer.   The packaging bag according to any one of claims 1 to 3, wherein the pressure-sensitive adhesive layer is mainly composed of amorphous polyolefin.

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