Synthetic resin bag with easy opening function

The present invention relates to a synthetic resin bag body having an easy-open function.

A synthetic resin bag body is provided in which a chuck that can be opened and closed is provided in the opening of the bag body, and an easy peel tape is arranged below the chuck.

The purpose of arranging the easy peel tape is to maintain the airtight state inside the bag even when the zipper is open and to prevent the inclusions inside the bag from seeping out when the liquid is liquid. is there.

However, the sealing means using the easy peel tape has a function of preventing the liquid from leaching from the inside of the bag to the outside in the adhesive layer having a strong adhesive force, but there is a problem that the peeling from the opening side is not easy. Has.

In order to facilitate the peeling of the easy peel tape from the opening side, it is satisfactory to set the adhesive strength to 0.6 to 1.5 kg / 15 mm, but this is insufficient for the strength from the inside of the bag body. Therefore, there is a drawback that the type, weight, filling rate, etc. of the contents are limited. To eliminate this drawback, it is satisfactory to make the adhesive strength of the Easy Peel Tape stronger than 2.0 to 4.0 kg / 15 mm, but the problem is that it is not easy to peel off from the opening side as described above. Will have.

<p><patcit num="1"><text>JP-A-57-96952</text></patcit><patcit num="2"><text>Jitsukaisho 57-105248 Gazette</text></patcit><patcit num="3"><text>Jitsukosho 62-38920 Gazette</text></patcit><patcit num="4"><text>Japanese Patent Application Laid-Open No. 62-271847</text></patcit><patcit num="5"><text>Japanese Patent Application Laid-Open No. 02-242748</text></patcit><patcit num="6"><text>Jitsukaihei 06-14044 Gazette</text></patcit></p>

<p> The present invention provides a synthetic resin bag body having an easy-open function that facilitates peeling from the opening side and prevents peeling from the inside of the bag body.</p>

<p>&lt;01&gt; In the present invention, in a synthetic resin bag body composed of two front and back body films, one easy peel tape composed of an easy peel layer and a heat-adhesive layer is applied to the inside of one body film of the bag opening. The easy peel layer has a non-adhesive portion on the opening side of the bag body, the inner side of the bag is weakly adhered over the edge of the easy peel tape, and the heat of the easy peel tape is inside the other body film. The adhesive layer is strongly adhered with a width narrower than the width of the weak adhesion and has non-adhesive portions on the bag opening side and the bag inner side, and the weak adhesion and the strong adhesion are orthogonal to the bag width direction of the easy peel tape. It is characterized by having long and short adhesive steps in the width direction of the tape to facilitate peeling from the opening side and prevent peeling from the inside of the bag body. &lt;02&gt; The present invention also states that, in the synthetic resin bag body having the easy-open function described above, a zipper that can be reopened and closed is arranged above or below the easy peel tape at the opening of the bag body. It is a feature.</p>

<p> According to the present invention, one piece of easy peel tape can be peeled off from the opening side of the bag body with a weak force due to the weak adhesion of the easy peel layer, facilitating the opening operation of the opening of the bag body, and the bag body. The pressure from the inside ensures a sealed state without peeling off the weak adhesion of the easy peel layer.</p>

<figref num="1">Sectional drawing of the main part which shows Example 1 of this invention</figref><figref num="2">Sectional drawing of the main part which shows the opening state of the bag body of Example 1.</figref><figref num="3">Cross-sectional view of a main part showing a state in which pressure from the inside of the bag body is applied in Example 1.</figref><figref num="4">Sectional drawing of the easy peel tape of Example 1</figref><figref num="5">Cross-sectional view of an easy peel tape showing an example of design modification of the strong adhesion mode of Example 1.</figref><figref num="6">Cross-sectional view of an easy peel tape showing an example of design modification of the strong adhesion mode of Example 1.</figref><figref num="7">Cross-sectional view of an easy peel tape showing an example of design modification of the strong adhesion mode of Example 1.</figref><figref num="8">Sectional drawing of the main part which shows Example 2 of this invention</figref><figref num="9">Sectional drawing of the main part which shows the opening state of the bag body of Example 2.</figref><figref num="10">Cross-sectional view of a main part showing a state in which pressure from the inside of the bag body is applied in Example 2.</figref><figref num="11">Sectional drawing of the easy peel tape of Example 2</figref><figref num="12">The figure which shows various adhesive patterns of weak adhesion in easy peel tape</figref>

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. 1 to 7 show Example 1 of the present invention, and the synthetic resin bag body is formed of a front side body film 1a and a back side body film 1b. Reference numeral 2 denotes an opening of the bag body, and reference numeral 3 denotes a reopenable / closable chuck provided in the opening 2. 2a and 2b are picking pieces when the opening operation of the opening 2 is performed, and the upper ends of the body films 1a and 1b may be used, or a dedicated picking piece may be formed separately.

In the present invention, two easy peel tapes 4a and 4b are provided so that the easy peel layers 11 of the weakly adhesive surface 6 face each other inside the body films 1a and 1b of the bag opening 2 over the entire width of the bag. Strong adhesion 5a, 5b, and strong adhesion 5a, 5b of one and the other easy peel tape 4a, 4b has a long and short adhesion width step in the tape width direction orthogonal to the bag width direction at the end on the inner side of the bag body. In FIGS. 1 to 4, both of the strong adhesive 5a and 5b have the end portions a and b on the opening side located on the edge of the easy peel tapes 4a and 4b on the opening side.

As illustrated in FIG. 4, the easy peel tapes 4a and 4b are tapes composed of three layers: PE or CPP or PET or NY thermal adhesive layer 9, PET or NY intermediate layer 10 and easy peel layer 11. is there. The layer is not limited to the above three layers, and a two-layer structure of a heat-bonding layer 9 and an easy peel layer 11 may be used.

Example 1 of the present invention will be described with reference to FIG. One of the easy peel tapes 4a is the entire tape width C1 orthogonal to the bag full width direction so that the easy peel layer 11 of the weak adhesive surface 6 faces the inside of the body films 1a and 1b of the opening 2 over the entire width of the bag. Strongly adheres 5a to the body film 1a, and the other easy peel tape 4b strongly adheres 5b to the body film 1b with a width C2 narrower than the tape width at the end on the inner side of the bag. That is, one strong adhesive 5a has a relationship of the entire tape width C1&gt; the other strong adhesive 5b has a width C2 narrower than the tape width. Further, both of the strong adhesive 5a and 5b are configured so that the ends a and b on the opening side are located on the edge of the easy peel tapes 4a and 4b on the opening side. Therefore, there is a long and short adhesion width step between the inner end C of the strong adhesive 5a and the inner end D of the strong adhesive 5b having a width C2 narrower than the tape width. The width C2 narrower than the tape width is appropriately about 1/2 of the tape width.

The adhesive strength of the weak adhesive surface 6 is, for example, 0.6 to 1.5 kg / 15 mm, and the adhesive strength of the strong adhesives 5a and 5b is 2.0 to 4.0 kg / 15 mm.

The operation of Example 1 of the present invention having the above structure will be described. At the opening of the opening 2, the picked pieces 2a and 2b are picked with a fingertip and pulled to the left and right as shown in FIG. 2 (A), and the left and right tensile tensions of the picked pieces 2a and 2b are shown in FIG. 2 (B). The ends of the easy peel tapes 4a and 4b on the opening side a and b act on the easy peel tapes 4a and 4b, and the ends on the opening side of the easy peel tapes 4a and 4b are peeled off to the left and right. As shown in FIG. 4, the weak adhesive surface 6 has a left-right reciprocity perpendicular to the weak adhesive surface 6 due to the action of the left and right tensile tensions on the ends a and b on the opening side of the easy peel tapes 4a and 4b. As shown in Fig. 2, the weak adhesive surface 6 starts to peel off from the opening side ends of the easy peel tapes 4a and 4b to the left and right, and the entire surface of the weak adhesive surface 6 peels off with a weak force. To do. That is, from the opening side, the easy peel tapes 4a and 4b can be peeled off with a weak force to easily open the opening 2 and prevent peeling from the inside of the bag body.

The reason why the Easy Peel Tapes 4a and 4b can be peeled off from the opening side with a weak force is that the left and right tensile tensions are applied to the ends A and B of the Easy Peel Tapes 4a and 4b on the opening side as described above. This is because, as shown in FIG. 4, the weak adhesive surface 6 is subjected to a force F1 in opposite directions at right angles to the weak adhesive surface 6 where the weak adhesive surface 6 is easily peeled off.

On the other hand, the pressure from the inside of the bag body ensures a sealed state without peeling off the weakly adhesive surface 6 of the easy peel layer 11. The reason is that there is a long and short adhesion width step between the inner end C of the strong adhesive 5a and the inner end D of the strong adhesive 5b having a width C2 narrower than the tape width.

That is, as shown in FIG. 3, the pressure from the inside of the bag body exerts a force on one body film 1a on the inner end c of the bag body of the strong adhesive 5a having the entire tape width C1 and the other body part. A force acts on the film 1b at the inner end of the bag body of the strong adhesive 5b having a width C2 narrower than the tape width. The force acting on the inner end C of the bag body of the strong adhesive 5a and the strong adhesive 5b having this long and short adhesive width step is the force F2 in the surface direction of the weak adhesive surface 6, and the surface of the weak adhesive surface 6 The weakly bonded surface 6 of the easy peel layer 11 that is surface-bonded by the force acting on the directional force F2 is not peeled off and a sealed state is secured.

Next, an example of design modification of the present invention will be described below. As shown in FIG. 5, the ends of the strong adhesive 5a and the strong adhesive 5b on the opening side are located at the edge of the easy peel tapes 4a and 4b on the opening side, and the strong adhesive 5a on the one body film 1a side. The inner edge of the bag body is shifted upward by D3 from the inner edge of the bag body of Easy Peel Tape 4a.

Further, as shown in FIG. 6, the inner end of the bag body of one Easy Peel Tape 4a is located at the lower end edge of the tape width orthogonal to the width direction of the bag and is strongly adhered to the one body film 1a 5a. The end of the other Easy Peel Tape 4b on the inner side of the bag is narrower than the tape width and strongly adhered to the other body film 1b 5b, and the above is the end of both the strong adhesives 5a and 5b on the opening side. Is positioned slightly downward by D1 and D2 from the edge of the easy peel tape on the opening side. The relationship of D1 and D2 is D1 D2.

Further, as shown in FIG. 7, one of the easy peel tapes 4a is strongly adhered to the body film 1a by slightly upwardly shifting D3 from the inner end of the bag body having a tape width orthogonal to the width direction of the bag. The end of the other Easy Peel Tape 4b on the inner side of the bag has a width narrower than the tape width and is strongly adhered to the other body film 1b 5b. Easy peel tapes 4a and 4b are located slightly downward from the edge on the opening side by D1 and D2. The relationship of D1 and D2 is D1 D2.

In any of the above design modification examples, the easy peel tapes 4a and 4b can be peeled off from the opening side with a weak force to easily open the opening 2 and prevent peeling from the inside of the bag body.

As described above, in the first embodiment of the present invention, the peeling force is weakened by the easy peel tapes 4a and 4b from the opening side to facilitate the opening operation and peeled from the inside of the bag body by the above structure. It has the advantage that it can maintain the difficult bag form until the product is opened. In addition, even if an unexpected force is applied from the outside of the bag body, the force does not propagate to the weak adhesive surface 6 of the easy peel tapes 4a and 4b, and the strong adhesive 5b is narrower than the tape width inside the bag body on the C2 side. It also has an advantage of preventing bag breakage because it propagates to the adhesive surface by the strong adhesive 5b of the body film 1b and maintains its adhesive strength.

Further, when the product content of the bag is liquid or water, by arranging the easy peel tapes 4a and 4b along the lower part of the chuck, the liquid or the like contained in the product can seep out to the opening 2. Since it can be prevented, it has the advantage of not impairing the product image and product handling when the product is displayed. In addition, since the contents can be taken out by opening by peeling off the easy peel tapes 4a and 4b, it is not necessary to tear and open the opening with a notch to take out the contents, and the cut film pieces can be scattered. There is no.

Example 1 is a synthetic resin bag composed of two easy peel tapes 4a and 4b. However, as shown in FIGS. 8 to 10, the present invention also uses one easy peel tape 4 as described above. Similar to Example 1, the easy peel tape can be peeled off from the opening side of the bag body with a weak force due to the weak adhesion of the easy peel layer, facilitating the opening operation of the opening of the bag body and from the inside of the bag body. At pressure, a sealed state can be ensured without peeling off the weak adhesion of the easy peel layer. Example 2 using one easy peel tape 4 will be described below.

Also in Example 2, the synthetic resin bag body is formed of the front side body film 1a and the back side body film 1b. Reference numeral 2 denotes an opening of the bag body, and reference numeral 3 denotes a reopenable / closable chuck provided in the opening 2. 2a and 2b are picking pieces when the opening operation of the opening 2 is performed, and the upper ends of the body films 1a and 1b may be used, or a dedicated picking piece may be formed separately.

As shown in FIG. 11, one easy peel tape 4 is a tape composed of three layers: a heat-bonding layer 9 of PE or CPP or PET or NY, an intermediate layer 10 of PET or NY, and an easy peel layer 11. The layer is not limited to the above three layers, and a two-layer structure consisting of a heat-bonding layer 9 and an easy peel layer 11 may be used.

One easy peel tape 4 composed of the easy peel layer 11 and the heat-adhesive layer 9 is not adhered to the inside of one body film 1a of the bag opening, and the easy peel layer 11 is not adhered to the opening 2 side of the bag. It has a part G1, and the inner side of the bag is weakly adhered 6a with an adhesive width E1 over the edge of the easy peel tape 4, and the heat adhesive layer 9 of the easy peel tape 4 is placed inside the other body film 1b. With a width E2 narrower than the adhesive width E1 of the weak adhesive 6a, the weak adhesive 6a and the strong adhesive 5 are strongly adhered by having non-adhesive portions G2 and G3 on the opening 2 side of the bag body and the side inside the bag. The structure is such that the easy peel tape 4 has a long and short adhesive step in the tape width direction orthogonal to the bag width direction.

The adhesive strength of the weak adhesive 6a is, for example, 0.6 to 1.5 kg / 15 mm, and the adhesive strength of the strong adhesive 5 is 2.0 to 4.0 kg / 15 mm.

The operation of Example 2 of the present invention having the above structure will be described. At the opening of the opening 2, the picked pieces 2a and 2b are picked with a fingertip and pulled to the left and right as shown in FIG. 9 (A), and the left and right tensile tensions of the picked pieces 2a and 2b are shown in FIG. 9 (B). The end of the Easy Peel Tape 4 on the opening side is easily peeled off in the left-right direction by acting on the non-adhesive portions G1 and G2 located below the edge of the Easy Peel Tape 4 on the opening side. Due to the left and right tensile tension acting on the non-adhesive parts G1 and G2 located below the edge of the easy peel tape 4 on the opening side, the weak adhesive 6a is weak as shown in FIG. As shown in Fig. 9, the weak adhesive 6a starts peeling to the left and right from the end of the easy peel tape 4 on the opening side due to the force F1 acting in the opposite directions at right angles to the adhesive surface of the adhesive 6a. The entire surface peels off with a weak force. That is, from the opening side, the easy peel tape 4 can be peeled off with a weak force to easily open the opening 2 and prevent peeling from the inside of the bag body.

The reason why the Easy Peel Tape 4 can be peeled off from the opening side with a weak force is that the non-adhesive portions G1 and G2 are located below the edge of the Easy Peel Tape 4 on the opening side as described above. As shown in FIG. 12, the force F1 in the opposite direction to the weak adhesive 6a, which is perpendicular to the weak adhesive 6a, is applied to the adhesive surface of the weak adhesive 6a due to the action of the left and right tensile tensions on the weak adhesive 6a. This is because it acts and causes interfacial or cohesive peeling.

On the other hand, the pressure from the inside of the bag body ensures a sealed state without peeling off the weak adhesive 6a. The reason is that the non-adhesive part between the inner end of the bag body of the weak adhesive 6a and the inner edge of the bag body of the strong adhesive 5 of the width E2 narrower than the tape width and the lower edge of the easy peel tape 4. It is due to having a long and short adhesive width step having G3.

That is, as shown in FIG. 10, the pressure from the inside of the bag body is weakly adhered to one body film 1a, and a force acts on the end portion inside the bag body, and the tape width is applied to the other body film 1b. A force acts on the chi by the non-adhesive part G3 inside the bag body of the strong adhesive 5 of the narrower width E2. The force acting on the inner end of the bag body of the strong adhesive 5 having this long and short adhesive width step is the force F2 in the surface direction of the strong adhesive 5 and the weak adhesive 6a, and the force F2 in the surface direction of the weak adhesive 6a. With the force acting on the force F2 (shear stress), the weakly bonded 6a of the easy peel layer 11 that is surface-bonded is not peeled off and a sealed state is secured.

The positions of the weak adhesive 6a and the strong adhesive 5 on the opening 2 side of the bag body and the inner end of the bag body are as shown in D1, D2, and D3 of the strong adhesive 5a and 5b of the first embodiment. Design changes can be set freely. Further, the same action and effect as those of Example 1 described above can be obtained with one Easy Peel Tape 4 of Example 2, and the cost can be reduced as compared with Example 1.

The adhesive patterns of the weak adhesives 6 and 6a in the easy peel tape 4 of the above-mentioned practical examples 1 and 2 are illustrated in FIG. That is, the bag body having a sawtooth shape 13, a rectangle 14, a circle 15 and the like, a grid seal 16, a line seal 17, a bubble seal 18, and the like are selectively used.

The present invention has the advantages that it does not require complicated steps, is easy to process, and has a low manufacturing cost, as compared with a film or the like in which a release adhesive resin is directly applied to an adhesive surface.

The bag body of the present invention is not limited to the inclusion of liquids and waters, but can also be applied to a bag body that encloses powders, fine particles, and various other encapsulated products.

In the above embodiment, the chuck 3 that can be reopened and closed in the opening 2 is described by the bag body provided above the easy peel tapes 4a, 4b, 4, but the chuck 3 is below the easy peel tapes 4a, 4b, 4. It is added that the present invention is also applied to a bag body without a chuck.

1a Front body film 1b Back side body film 2 openings 3 chuck 4 Easy peel tape 4a Easy peel tape 4b Easy peel tape 5 Strong adhesion 5a Strong adhesion 5b Strong adhesion 6 Weak adhesive surface 6a Weak adhesion 9 Thermal adhesive layer 11 Easy peel layer