JP2018111519A - Packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To propose a packaging bag in which a degree of freedom against the position and shape of an opening part is high and which is excellent in seal-opening performance and resealing performance.SOLUTION: Provided is a packaging bag in which sealant layers of a front surface lamination body and a rear surface lamination body having respectively a base material layer and a sealant layer face each other and the peripheral edge is thermally sealed. At the upper part, included is an opening planned part. At the outside of either of the front surface lamination body and the rear surface lamination body and at the part which does or does not include the opening planned part and is below the opening planned part, adhered is an adhesion tape for resealing. The adhesion tape for resealing includes a self-adhering layer on the surface, and an adhesion performance is exhibited because self-adhering layers are crimped to each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a packaging bag, and particularly to a packaging bag excellent in resealability and openability.

  A packaging bag made of a laminate 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 resealability at the opening may be used.

  The most common resealable packaging bags include so-called zippered packaging bags. The packaging bag with a zipper has a structure in which a synthetic resin fastener that fits in a band shape is attached to the inside of each of the front side and the back side of the opening, and a structure in which the convex part on the other side is fitted to the concave part on one side Is.

  In many cases, zippered packaging bags have fasteners attached in parallel to the top side of the rectangular packaging bag, so it is not possible to cut the top corner of the bag diagonally and swing out the contents. It was. In the case of powdered contents, there is also a problem that the powder enters the concave portion of the fastener while the number of uses is repeated, and the resealability is lowered.

  The re-sealable 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 fasteners are obliquely attached to the corners of the packaging bag. In order to manufacture this packaging bag, it is necessary to attach a zipper diagonally, but since such a bag making requires very special manufacturing equipment, it cannot be easily manufactured. was there. Moreover, the problem that the powder adheres to the fastener as described above has not been solved.

Japanese Patent No. 5690483

  The problem to be solved by the present invention is to propose a packaging bag having a high degree of freedom with respect to the position and shape of the opening, and excellent in opening and resealability.

  As a means for solving the above problems, the invention according to claim 1 is such that the sealant layers of the surface laminate and the back laminate having the base material layer and the sealant layer are opposed to each other, and the periphery is heat-sealed. A re-sealing adhesive tape having a planned opening at the top, outside the front or back of the laminate and including or not including the planned opening at the bottom. The adhesive tape for resealing has a self-adhesive layer on the surface, and exhibits self-adhesiveness when the self-adhesive layers are pressure-bonded to each other. It is a bag.

  Since the packaging bag according to the present invention has a self-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. .

Moreover, the invention according to claim 2 is a position in which the planned opening portion obliquely opens the upper corner of the packaging bag, and the adhesive tape for resealing includes a part of the planned opening portion. The packaging bag according to claim 1, wherein the packaging bag is attached horizontally.

  The invention according to claim 3 is characterized in that 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.

  The packaging bag according to the present invention has a resealable adhesive tape attached below the planned opening, and the resealable adhesive tape has a self-adhesive layer on the surface, and the self-adhesive layers are Since the adhesive is exerted by pressure bonding, the opening can be resealed by folding back at the center of the adhesive tape.

  Since the self-adhesive layer exhibits pressure-sensitive adhesive properties only after the self-adhesive layers are pressure-bonded, bags stacked in the same direction on the front and back sides do not adhere. For this reason, the filling workability is not impaired in the filling machine.

  Since the adhesive tape for resealing is affixed to the outside of the packaging bag, it is not easily contaminated by the contents. For this reason, even if opening and resealing are repeated many times, the resealability is hardly deteriorated.

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

  Therefore, as in the invention described in claim 2, even if the planned opening portion opens the upper corner of the packaging bag obliquely, the resealable pressure-sensitive adhesive tape has a portion of the planned opening portion. What is necessary is just to stick horizontally to the position to include. This means that the production of the packaging bag is possible with a conventional general bag making machine, and the production of the packaging bag can be easily performed.

  In addition, because the resealable adhesive tape has good laser absorbency, it does not cause any obstacle when performing half-cut processing by laser along the planned opening, but rather half-cut processing Improves.

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

  The packaging bag 1 which concerns on this invention is a packaging bag formed by making the sealant layers of the surface laminated body 11 and the back surface laminated body 12 which have at least the base material layer 15 and the sealant layer 17 face each other, and heat-sealing the periphery. In the example of the laminate 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 laminate 11 and the back surface laminate 12 to form the top seal portion 2, the side seal portion 3, and the bottom seal portion 4. It has a structure of
The packaging bag 1 according to the present invention has a planned opening portion 5 in the upper part, and is resealed below the planned opening portion 5 outside the laminated body on either the front or back side and including or not including the planned opening portion 5. The adhesive tape 14 for stop is stuck, the adhesive tape 14 for resealing has the self-adhesion layer 20 on the surface, and exhibits adhesiveness by the self-adhesion layers 20 being crimped together. It is a packaging bag characterized by being.

  In the example shown in FIGS. 1 and 2, the resealable adhesive tape 14 is attached to the outside of the surface laminate 11. In addition, many portions of the planned opening portion 5 are accommodated within the width of the resealable adhesive tape, and a part thereof protrudes above the resealable adhesive tape 14.

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

  In this way, the position of the resealable adhesive tape 14 is partially or entirely below the planned opening portion 5, and the resealable adhesive tape is bent along the center line so that the opening is sealed. It only needs to be in a position where it can be stopped.

  There are no particular restrictions on the material of the front surface laminate 11 and the back surface laminate 12, and the bottom tape 13 in the example of FIG. 1, 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, or the like is generally used.

  The barrier layer 16 is for preventing the permeation of oxygen and water vapor and enhancing 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 deposited film obtained by depositing metal such as aluminum on PET film, etc., and inorganic oxide deposited by depositing inorganic oxide such as aluminum oxide and silicon oxide on PET film Gas barrier coating layers such as films or polyvinylidene chloride coatings, coatings containing water-soluble resins and inorganic layered compounds, and resin layers consisting of coatings obtained by reacting metal alkoxides or their hydrolysates with isocyanate compounds It can be used as the metal foil such as aluminum foil.

  As the sealant layer 17, a polyolefin resin is generally used. Specifically, a low density polyethylene resin (LDPE), a medium density polyethylene resin (MDPE), a linear low density polyethylene resin (LLDPE), ethylene- Ethylene resins such as vinyl acetate copolymer (EVA), ethylene-α olefin copolymer, ethylene-methacrylic acid resin copolymer, blend 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 resealable adhesive tape 14. In this example, the base material layer 18, the easy adhesion layer 19, and the self-adhesive layer 20 are laminated | stacked 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 laminated body 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 packaging bag body is polyethylene terephthalate (PET), and the adhesive tape 14 for resealing is to be heat-sealed, the base material layer The objective is achieved by making 18 a heat sealable PET.

  If the adhesive tape 14 for re-sealing is stuck with an adhesive, the range of selection of the material of the base material layer 15 of the laminate and the base material layer 18 of the adhesive tape 14 for resealing is increased.

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

  As a method of manufacturing the pressure-sensitive adhesive tape 14 for resealing, the self-adhesive layer 20 can be bonded and manufactured after applying the easy-adhesion layer 19 to the base material layer 18 and drying it.

  In the example shown in FIGS. 1, 3, and 4, the planned opening portion 5 opens the upper corner of the packaging bag 1 obliquely, and the resealable adhesive tape 14 has a portion of the planned opening portion. It is affixed horizontally to the position including it.

  Thus, when it is set as the structure which sticks the adhesive tape 14 for resealing horizontally, when manufacturing the packaging bag 1 with a bag making machine, the surface laminated body 11, the back surface laminated body 12, and a bottom tape By unwinding the resealable adhesive tape 14 in the same manner in a bag making machine that unwinds 13 and makes bags, the bags can be continuously produced. This means that the packaging bag 1 can be manufactured with minimal modification to an existing bag making machine, and the effect is great.

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

  In particular, the half-cutting process using a laser can be efficiently performed by irradiating laser light from the side of the resealable adhesive tape because the laser light absorbability of the resealable adhesive tape 14 is high. .

  In order to confirm the effect of half-cut by laser processing, the following experiment was conducted. As Sample 1, a laminate having a configuration of a resealable adhesive tape / base material layer / sealant layer was prepared. As Sample 2, a laminate having a base layer / sealant layer configuration 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 pressure-sensitive adhesive tape for resealing was composed of a base material layer / an easily adhesive layer / 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-adhesion layer, a coating film obtained by applying and drying printing ink was used. 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.

  From the laminate of sample 1 and sample 2, test pieces having a width of 50 mm and a length of 150 mm were cut out in three directions of the film flow direction (MD), the width direction (TD), and the 45 ° direction, and the test pieces were cut in the longitudinal direction. 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 / second.

  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 a chuck of a tensile tester, 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 resealable pressure-sensitive adhesive tape is superior in tearing property and unsealing property compared to the case without the resealable pressure-sensitive adhesive tape. Hereinafter, the packaging bag according to the present invention will be described more specifically 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 bonded together by a dry laminating method to form a surface laminate, a back laminate, and a bottom tape.

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

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

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

  The packaging bags of the example and the comparative example were each filled with 200 grams of sodium chloride, and about 10 grams were shaken out from the opening, and then resealed. This operation was set as 1 set, 1 to 10 sets were performed, and resealability was confirmed. The results are shown in Table 2.

  In a general packaging bag using a chuck as in the comparative example, salt is clogged in the fitting portion of the chuck in the fifth set, and the resealability cannot be exhibited, whereas the packaging according to the present invention In the bag, the resealability did not decline even after 10 sets were repeated.

  In another experiment, the packaging bag of Example 1 was filled with 100 grams of non-washed rice, resealed, and then inverted and shaken up and down 5 times to prevent the contents from spilling.

DESCRIPTION OF SYMBOLS 1 ... Packaging bag 2 ... Top seal part 3 ... Side seal part 4 ... Bottom seal part 5 ... Planned opening part 6 ... Half cut processing 7 ... Chuck tape 8 ... Opening 9 ... Bending position 11 ... Front laminate 12 ... Back laminate 13 ... Bottom tape 14 ... Resealable adhesive tape 15 ... Base material layer 16 ... -Barrier layer 17 ... Sealant layer 18 ... Base material layer 19 ... Easy adhesion layer 20 ... Self-adhesive layer 22 ... Packaging bag of comparative example

Claims (3)

  It is a packaging bag in which 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 periphery is heat-sealed. A re-sealing adhesive tape is adhered to the outside of the laminated body and including or not including the planned opening portion below the planned opening portion, and the re-sealing adhesive tape is self-adhesive on the surface. A packaging bag comprising a layer and exhibiting adhesiveness when the self-adhesive layers are pressure-bonded to each other.   The planned opening portion opens the upper corner of the packaging bag obliquely, and the resealable adhesive tape is horizontally attached to a position including a part of the planned opening portion. The packaging bag according to claim 1.   The packaging bag according to claim 1 or 2, wherein a half-cut process by a laser is performed along the planned opening portion from the side of the adhesive tape for resealing.

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