JP6880755B2 - Packaging bag - Google Patents

Description

The present invention relates to a packaging bag, and more particularly to a packaging bag having excellent resealing property and opening property.

A packaging bag made of a laminated body in which a synthetic resin film or the like is bonded is used for the purpose of storing various articles such as food. When it is necessary to use the contents filled in the packaging bag for dispensing, a packaging bag having a resealing property at the opening may be used.

The most common resealable packaging bag is a so-called zippered packaging bag. A packaging bag with a zipper has a zipper made of synthetic resin that fits in a band shape on the inside of the front side and the back side of the opening, and generally has a structure in which the convex part on the other side fits into the concave part on one side. Is the target.

In many cases, the zipper is attached parallel to the upper side of the rectangular packaging bag, so the zippered packaging bag cannot be used in such a way that the upper corner of the bag is cut off diagonally to shake out the contents. It was. Further, in the case of a powdery content, there is a problem that the powder gets into the recess of the fastener during repeated use, and the resealing property is lowered.

The resealable packaging bag described in Patent Document 1 solves the problem of the opening position among the above problems, and is a packaging bag in which a fastener is diagonally attached to a corner of the packaging bag. In order to manufacture this packaging bag, it is necessary to attach the fastener diagonally, but such a bag making requires very special manufacturing equipment, so there is a problem that it cannot be easily manufactured. was there. Moreover, the problem of powder adhering to the fastener as described above has not been solved yet.

Japanese Patent No. 56904843

An object to be solved by the present invention is to propose a packaging bag having a high degree of freedom regarding the position and shape of an opening and having excellent opening and resealing properties.

As a means for solving the above-mentioned problems, in the invention according to claim 1, the sealant layers of the front surface laminate and the back surface laminate having the base material layer and the sealant layer are opposed to each other, and the peripheral edges are heat-sealed. A packaging bag that has a planned opening at the top, is outside the laminate on either the front or back side, and includes or does not include the planned opening, and is a resealing adhesive tape below the planned opening. The resealing adhesive tape has a self-adhesive layer on its surface, and the self-adhesive layers are pressure-bonded to each other to exhibit adhesiveness. It is a bag.

Since the packaging bag according to the present invention has a resealing adhesive tape having a self-adhesive layer attached to the outside of the lower part of the planned opening portion, it can be resealed by folding back at the center of the adhesive tape. ..

Further, in the invention according to claim 2, the planned opening portion diagonally opens the upper corner of the packaging bag, and the resealing adhesive tape is at a position including a part of the planned opening portion. The packaging bag according to claim 1, wherein the bag is horizontally attached to the bag.

The invention according to claim 3 is the invention according to claim 1 or 2, wherein a half-cut process by a laser is performed from the side of the adhesive tape for resealing along the planned opening portion. It is a packaging bag.

In the packaging bag according to the present invention, a resealing adhesive tape is attached below the planned opening portion, and the resealing adhesive tape has a self-adhesive layer on the surface, and the self-adhesive layers are attached to each other. Since the adhesive is exhibited by being crimped, the opening can be resealed by folding back at the central portion of the adhesive tape.

Since the resealing adhesive tape exhibits adhesiveness only when the self-adhesive layers are pressure-bonded to each other, the bags stacked in the same direction on the front and back do not adhere to each other. Therefore, in the filling machine, the filling workability is not impaired.

Since the adhesive tape for resealing is attached to the outside of the packaging bag, it is not easily contaminated by the contents. Therefore, it has a feature that the resealing property does not easily deteriorate even if the opening and resealing are repeated many times.

By giving the adhesive tape for resealing a certain width, the tolerance for the shape and size of the opening opening is increased, and the design width of the planned opening portion is widened.

Therefore, as in the invention of claim 2, even if the planned opening portion diagonally opens the upper corner of the packaging bag, the resealing adhesive tape covers a part of the planned opening portion. It suffices if it is attached horizontally at the position including it. This means that the packaging bag can be manufactured by a conventional general bag making machine, and the packaging bag can be easily manufactured.

Furthermore, since the adhesive tape for resealing has good laser absorption, it does not cause any obstacles when performing half-cut processing by laser along the planned opening portion, but rather half-cut processing. Improves sex.

FIG. 1 is a plan explanatory view showing an embodiment of a packaging bag according to the present invention. FIG. 2 is a cross-sectional explanatory view showing a cross section taken along the line AA ′ of FIG. FIG. 3 is a plan explanatory view showing a state in which the packaging bag shown in FIG. 1 is opened. FIG. 4 is a plan explanatory view showing a state in which the opened packaging bag is resealed. FIG. 5 is a schematic cross-sectional view showing an example of the layer structure of the laminate constituting the packaging bag according to the present invention. FIG. 6 is a schematic cross-sectional view showing an example of the layer structure of the resealing adhesive tape. FIG. 7 is a plan explanatory view of a packaging bag of a comparative example.

Hereinafter, the packaging bag according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan explanatory view showing an embodiment of a packaging bag according to the present invention. Further, FIG. 2 is a cross-sectional explanatory view showing a cross section taken along the line AA ′ of FIG. Further, FIG. 3 is a plan explanatory view showing a state in which the packaging bag shown in FIG. 1 is opened. Further, FIG. 4 is a plan explanatory view showing a state in which the opened packaging bag is resealed. Further, FIG. 5 is a schematic cross-sectional view showing an example of the layer structure of the laminated body constituting the packaging bag. Further, FIG. 6 is a schematic cross-sectional view showing an example of the layer structure of the resealing adhesive tape.

The packaging bag 1 according to the present invention is a packaging bag formed by facing the sealant layers of the front surface laminate 11 and the back surface laminate 12 having at least the base material layer 15 and the sealant layer 17 and heat-sealing the peripheral edges. In the example of the laminated body shown in FIG. 5, the barrier layer 16 is laminated between the base material layer 15 and the sealant layer 17.

In the example shown in FIGS. 1 to 4, a standing pouch in which the bottom tape 13 is inserted between the front surface laminated body 11 and the back surface laminated body 12 to form the top seal portion 2, the side seal portion 3, and the bottom seal portion 4. It has the structure of.
The packaging bag 1 according to the present invention has a planned opening portion 5 at the upper part, and is resealed outside the laminated body on either the front or the back surface and below the planned opening portion 5 including or not including the planned opening portion 5. The adhesive tape 14 for stopping is attached, and the adhesive tape 14 for resealing has a self-adhesive layer 20 on the surface, and the self-adhesive layers 20 are pressure-bonded to each other to exhibit adhesiveness. It is a packaging bag characterized by being present.

In the examples shown in FIGS. 1 and 2, the resealing adhesive tape 14 is attached to the outside of the surface laminate 11. Most of the planned opening portion 5 fits within the width of the resealing adhesive tape, and a part of the opening portion 5 protrudes above the resealing adhesive tape 14.

When this packaging bag is opened along the planned opening portion 5 as shown in FIG. 3 and further bent at the bending position 9 which is the center line of the resealing adhesive tape 14 as shown in FIG. The self-adhesive layers 20 are pressure-bonded to each other to exhibit adhesiveness, so that resealing is possible.

In this way, the position of the resealing adhesive tape 14 is partially or wholly below the planned opening portion 5, and the opening is sealed by bending the resealing adhesive tape along the center line. It suffices if it is in a position where it can be stopped.

The materials of the front surface laminate 11, the back surface laminate 12, and the bottom tape 13 in the example of FIG. 1 are not particularly limited, and various synthetic resin films generally used as packaging bags are used. As the base material layer 15, polypropylene resin (PP), polyethylene terephthalate resin (PET), polyamide resin and the like are generally used.

The barrier layer 16 is for preventing the permeation of oxygen and water vapor to improve the storage stability of the contents, and is a polyvinylidene chloride film, a polyvinyl alcohol film, an ethylene vinyl alcohol copolymer film, a gas barrier nylon film, and a gas barrier property. Gas barrier film such as polyethylene terephthalate (PET) film, metal vapor deposition film in which metal such as aluminum is vapor-deposited on PET film, and inorganic oxide vapor deposition in which inorganic oxide such as aluminum oxide and silicon oxide is vapor-deposited on PET film. A gas barrier coating layer such as a film, a polyvinylidene chloride coating, a film containing a water-soluble resin and an inorganic layered compound, a resin layer formed by reacting a metal alkoxide or its hydrolyzate with an isocyanate compound, an aluminum foil, or the like. Metal foil or the like can be used.

As the sealant layer 17, a polyolefin resin is generally used. Specifically, low density polyethylene resin (LDPE), medium density polyethylene resin (MDPE), linear low density polyethylene resin (LLDPE), ethylene- Ethylene resins such as vinyl acetate copolymer (EVA), ethylene-α olefin copolymer, ethylene-methacrylic acid resin copolymer, blended resin of polyethylene and polybutene, homopolypropylene resin (PP), propylene- Polypropylene resins such as ethylene random copolymer, propylene-ethylene block copolymer, and propylene-α olefin copolymer are used.

FIG. 6 is a schematic cross-sectional view showing an example of the layer structure of the resealing adhesive tape 14. In this example, the base material layer 18, the easy-adhesion layer 19, and the self-adhesive layer 20 are laminated in this order. The material of the base material layer 18 is appropriately selected depending on the material of the base material layer 15 of the laminate constituting the packaging bag main body and the method of sticking to the material.

For example, if the material of the base material layer 15 of the laminate constituting the main body of the packaging bag is polyethylene terephthalate (PET), and the adhesive tape 14 for resealing is to be heat-sealed to this, the base material layer The purpose is achieved by making 18 a heat-sealable PET.

If the resealing adhesive tape 14 is attached with an adhesive, the range of material selection between the base material layer 15 of the laminated body and the base material layer 18 of the resealing adhesive tape 14 is widened.

As the self-adhesive layer 20, a coating film obtained by applying and drying a mixed solution of a natural rubber latex and a water-soluble adhesive can be used.

As a method for producing the resealing adhesive tape 14, the easy-adhesive layer 19 can be applied to the base material layer 18, dried, and then the self-adhesive layer 20 can be bonded to the base layer 18.

In the examples shown in FIGS. 1, 3 and 4, the planned opening portion 5 diagonally opens the upper corner of the packaging bag 1, and the resealing adhesive tape 14 forms a part of the planned opening portion. It is attached horizontally at the position including it.

In this way, when the resealing adhesive tape 14 is horizontally attached, the front surface laminate 11, the back surface laminate 12, and the bottom tape are used when the packaging bag 1 is made by the bag making machine. In a bag making machine that unwinds each of the 13 and makes a bag, the resealing adhesive tape 14 can be unwound in the same manner to continuously make a bag. This means that the packaging bag 1 can be manufactured with a minimum modification to the existing bag making machine, and the effect is great.

Although not particularly shown, the planned opening portion 5 may be provided with a notch that triggers the opening at the opening start portion. Further, by providing a cutting tool or a half-cut line by laser processing along the planned opening portion, opening can be performed smoothly and easily.

In particular, the laser half-cut processing can be efficiently performed by irradiating the laser light from the side of the resealing adhesive tape because the resealing adhesive tape 14 has high absorption of laser light. ..

The following experiment was conducted to confirm the effect of half-cut by laser processing. As sample 1, a laminate having a structure of a resealing adhesive tape / base material layer / sealant layer was prepared. As sample 2, a laminate having a base material layer / sealant layer structure was prepared. As each base material layer, a PET film having a thickness of 12 μm was used. As the sealant layer, an LLDPE film having a thickness of 70 μm was used.

The adhesive tape for resealing was composed of a base material layer, an easy-adhesion layer, and a self-adhesive layer, and a heat-sealable PET having a thickness of 12 μm was used as the base material layer. As the easy-adhesive layer, a coating film obtained by applying and drying printing ink was used, and as the self-adhesive layer, a coating film obtained by applying and drying a mixed solution of natural rubber latex and a water-soluble adhesive was used.

A test piece having a width of 50 mm and a length of 150 mm is cut out from the laminate of sample 1 and sample 2 in three directions of the film flow direction (MD), width direction (TD), and 45 ° direction, and is oriented in the longitudinal direction of the test piece. , A half-cut line was provided along the center line using a carbon dioxide laser processing machine. The laser irradiation conditions were an output of 21 W and a scanning speed of 1000 mm / sec.

A slit was formed along the center line of the test piece over half the length (75 mm), and both sides of the slit were fixed to the chuck of the testing machine and the tear strength was measured according to the Trouser method. The results are shown in Table 1.

From this result, it can be seen that the presence of the resealing adhesive tape has better tearability and better opening property than the one without it. Hereinafter, the packaging bag according to the present invention will be described in more detail based on Examples.

A PET resin film having a thickness of 12 μm was used as the base material layer, an aluminum foil having a thickness of 9 μm was used as the barrier layer, and an LLDPE film having a thickness of 50 μm was used as the sealant layer. These three layers were laminated by a dry laminating method to form a front laminated body, a back laminated body, and a bottom tape.

As the adhesive tape for resealing, a heat-sealable PET resin film having a thickness of 12 μm was used as the base material layer, and printing ink was applied and dried as the easy-adhesive layer, and natural rubber was used as the self-adhesive layer. A coating film obtained by applying a mixed solution of a latex and a water-soluble adhesive and drying the mixture was used.

As a method for producing the adhesive tape for resealing, a method was adopted in which the easy-adhesive layer was gravure-coated on the base material layer, dried, and the self-adhesive layer was dry-laminated.
After heat-sealing the resealing adhesive tape to the front surface laminate, a bag was made together with the back surface laminate and the bottom tape to prepare a packaging bag as shown in FIG.

<Comparison example>
As a comparative example, a packaging bag as shown in FIG. 7 was prepared using the same laminate used in the examples. A fastener (LL-210 manufactured by Idemitsu Unitech Co., Ltd.) was attached to the opening.

The packaging bags of Examples and Comparative Examples were each filled with 200 grams of salt, and about 10 grams of salt was squeezed out from the opening at a time, and then resealed. This operation was set as one set, and 1 to 10 sets were performed to confirm the resealing property. The results are shown in Table 2.

In a general packaging bag using a zipper as in the comparative example, the fitting portion of the zipper is clogged with salt in the fifth set and the resealing property cannot be exhibited, whereas the packaging according to the present invention. In the bag, the resealing property did not deteriorate even after repeating 10 sets.

In another experiment, the packaging bag of Example 1 was filled with 100 grams of non-washed rice, resealed, and then turned upside down and shaken up and down 5 times without spilling the contents.

1 ... Packaging bag 2 ... Top seal part 3 ... Side seal part 4 ... Bottom seal part 5 ... Scheduled opening part 6 ... Half-cut processing 7 ... Chuck tape 8 ...・ Opening 9 ・ ・ ・ Bent position 11 ・ ・ ・ Front surface laminate 12 ・ ・ ・ Back surface laminate 13 ・ ・ ・ Bottom tape 14 ・ ・ ・ Adhesive tape for resealing 15 ・ ・ ・ Base material layer 16 ・ ・・ Barrier layer 17 ・ ・ ・ Sealant layer 18 ・ ・ ・ Base material layer 19 ・ ・ ・ Easy adhesive layer 20 ・ ・ ・ Self-adhesive layer 22 ・ ・ ・ Packaging bag of comparative example

Claims (2)

A packaging bag in which the sealant layers of a front surface laminate and a back surface laminate having a base material layer and a sealant layer are opposed to each other and the peripheral edges are heat-sealed.
It has a planned opening at the top
An adhesive tape for resealing is attached to the outside of either the front or back laminate and below the planned opening portion, which includes or does not include the planned opening portion.
該再sealing adhesive tape, a heat-sealable PET resin film as a base material layer, the surface has a self-adhesive layer, by between self-adhesive layer is crimped state, and are not exhibit tack ,
Moreover, this adhesive tape for resealing is attached at a position including a part of the planned opening portion.
A packaging bag characterized in that a laser half-cut process is performed from the side of the adhesive tape for resealing along the planned opening portion. The opening portions to be is to open the upper corner corner of the packaging bag obliquely, the adhesive tape for resealing the packaging of claim 1, characterized in that it is water earnestly stuck bag.

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