JP2009241974A - Packaging material and packaging bag using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a versatile packaging material having easy unsealability only on a desired seal part, and a packaging bag using the same. <P>SOLUTION: In the packaging material of a pillow bag with base material layers 20-22 and a heat-sealable resin layer 24 being affixed to each other, when the heat-sealable resin layer 24 side of the base material layer 22 is subjected to the corona treatment, a part forming the seal part is subjected to the corona treatment except the heat-sealable resin layer 24 side of the base material layer 22 serving as the back seal part 12. In this constitution, the seal strength between the base material layer 22 of the back seal part 12 not subjected to the corona treatment and the heat-sealable resin layer 24 is weaker than the seal strength between the base material layer 22 of the seal part subjected to the corona treatment and the heat-sealable resin layer 24, resulting in the easy unsealability of the back seal part. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a packaging material in which a base material layer and a heat-adhesive resin layer are bonded together and an easy-opening property of a packaging bag using the packaging material.

  Conventional packaging bags using resin films include pillow bags with back seals and top and bottom seals on cylindrical barrels, three-side seal bags with three sides sealed, and four-side seals with four sides sealed There are a bag, a standing pouch in which the bottom of the bag is three-dimensionally secured, and a gusset bag in which both sides or the bottom are folded in a V shape.

  Various methods such as a tearing method and a cutting method are applied to the opening method of these packaging bags, and one of the methods is a method using a resin film exhibiting an easy peel property of a cohesive failure type or a delamination type. (See Patent Document 1).

Thus, by using the resin film which shows easy peel property, the sealing strength of the seal part of a packaging bag can be weakened, and easy openability is implement | achieved.
Japanese Patent Laid-Open No. 10-139048

  However, the resin film exhibiting easy peel properties is expensive and the specifications of the packaging material are limited. Moreover, since the seal strength of all the seal portions of the packaging bag is uniformly weakened, there is a problem that the seal strength of the seal portions that do not need to be opened is also weakened.

  An object of this invention is to provide the versatile packaging material which gave easy-opening property only to the desired seal part, and a packaging bag using the same.

  In order to achieve the above object, the present invention provides a seal portion when corona treatment is performed on the thermal adhesive resin layer side of the base material layer in a packaging material in which the base material layer and the thermal adhesive resin layer are bonded together. Among the portions, the corona treatment is performed except for the thermal adhesive resin layer side of one of the base material layers to be combined as a seal portion having easy-openability.

  According to this configuration, the seal strength between the base material layer of the seal portion not subjected to the partial corona treatment and the thermal adhesive resin layer is such that the base material layer of the seal portion subjected to the corona treatment and the thermal adhesive resin layer are It becomes weaker than the sealing strength between. As a result, it is possible to adjust the sealing strength to have easy-openability.

  In the packaging material described above, from the viewpoint of improving easy-openability, except for the heat-bonding resin layer side of the other base material layer to be combined as a seal portion having easy-openability among the portions to be the seal portions. Corona treatment is desirable.

  Moreover, in said packaging material, it is desirable to provide a non-seal part in at least one part of the outer side of the seal part which has the said easy-open property from a viewpoint of providing the clue of opening.

  Further, in the above packaging material, from the viewpoint of making the desired seal part easy to open, among the parts to be the seal part of the heat-adhesive resin, the seal part having easy openability is the back seal part of the pillow bag. It is desirable to be.

  Moreover, the packaging bag of this invention shall use said packaging material.

  According to the present invention, since the partial corona treatment is performed except for the base adhesive layer side of the base material layer in the desired seal portion, the seal strength of that portion becomes weaker than the other seal portions. As a result, only the seal part not subjected to the corona treatment can be easily opened, and the consumer can easily open the seal part by pulling the seal part on both sides with the seal part as the center. . At that time, the corona-treated seal portion is strongly sealed, so there is no possibility of being unsealed together.

  Moreover, according to this invention, a partial corona treatment can be performed in-line by providing a corona treatment apparatus on the line of another process. Therefore, a process only for the partial corona treatment is not required, which leads to work efficiency and cost reduction.

  Further, according to the present invention, since the base material layer is only modified by the partial corona treatment, it can be applied to various layer configurations (specifications).

  FIG. 1 is a view showing an example of the pillow bag of the present invention, FIG. 2 is a developed view seen from the inner surface side of the pillow bag of FIG. 1, and FIG. 3 is a cross-sectional view taken along line AA of FIG. The pillow bag 10 is made by sealing a sealing portion of one rectangular sheet-shaped packaging material 11. The seal portion includes a back seal portion 12, a lower seal portion 13, and an upper seal portion 14. The pillow bag 10 has a back seal portion 12 that is easily opened.

  The packaging material 11 has a rectangular shape as shown in FIG. The layer structure of the packaging material 11 is, for example, as shown in FIG. 3, in order from the outside, an OPP (biaxially stretched polypropylene) layer 20, an adhesive layer 21, a VMPET (aluminum-deposited biaxially stretched polyester) layer 22, and PE. A (polyethylene) layer 23 and a CPP (unstretched polypropylene) layer 24 that is a heat-adhesive resin layer are laminated. Hereinafter, the OPP layer 20, the adhesive layer 21, and the VMPET layer 22 are collectively referred to as a base material layer.

  As the deposited material of the VMPET layer 22, silica or alumina can also be adopted. Note that the thickness of each layer may be determined as appropriate because the required performance varies depending on the inclusion.

  In addition, on the side of the adhesive layer 21 of the OPP layer 20, printing (not shown) of a product pattern or the like is performed. Further, the surface of the VMPET layer 22 on the PE layer 23 side is subjected to corona treatment except for the portion to be the back seal portion 12. In FIGS. 2 and 3, the corona-treated portion is indicated by hatching.

  The corona treatment is a conventionally known treatment. For example, a corona discharge is generated in the atmosphere using a high-frequency high voltage, and the resin surface is irradiated with the functional groups generated thereby. This is a treatment for modifying the surface of the resin.

  The manufacturing of the packaging material 11 can be performed by the following processes, for example. Except for the first step of printing on the roll-shaped OPP film, the second step of applying an adhesive to the printing surface of the OPP film or the vapor-deposited surface of the VMPET film, and bonding the two together, and the portion that becomes the back seal portion 12 This is a third step in which the VMPET surface is corona-treated and the molten PE is extruded by the T-die method to bond the VMPET surface and the CPP film. As in the third step, by adding a corona treatment device to the line of the extruder, the corona treatment can be performed in-line before the VMPET surface and the CPP film are bonded together.

  FIG. 4 shows an example of imposition of the packaging material 11. In FIG. 4, the three packaging materials 11 are arranged in the width direction B of the roll, and the back seal portions 12 are connected in parallel to the flow direction C of the roll. As a result of this imposition, the back seal portion 12 not subjected to corona treatment is connected linearly in the flow direction, and the other portions subjected to corona treatment are connected linearly in the flow direction. By providing the corona treatment device in the direction, the corona treatment can be performed on the portion of the VMPET layer 22 excluding the back seal portion 12 in-line. Therefore, the process only for the corona treatment is not required, and the work efficiency is improved and the cost is reduced.

  From the state of the roll as shown in FIG. 4, the sheet is cut for each row and then loaded on the inclusion filling machine. And when filling an inclusion, while sealing a seal | sticker part, it divides | segments into the pillow bag 10 one by one.

  According to such a pillow bag 10, since only the VMPET surface of the back seal portion 12 is not subjected to the partial corona treatment, the seal strength between the VMPET layer 22 and the PE layer 23 of the back seal portion 12 is low. In addition, the sealing strength between the VMPET layer 22 and the PE layer 23 of the upper seal portion 14 is weaker. As a result, the pillow bag 10 is easily peeled between the VMPET layer 22 and the PE layer 23 of the back seal portion 12. At the time of opening, it is opened by cohesive failure of the CPP layer 24 and the PE layer 23 and delamination between the VMPET layer 22 and the PE layer 23. Accordingly, only the back seal portion 12 can be easily opened, and the consumer can easily open the bag by pulling the vicinity of the back seal portion 12 to both sides. At that time, since the lower seal portion 13 and the upper seal portion 14 are strongly sealed, there is no possibility that they are unsealed together.

  In the above-described embodiment, the back seal portion 12 is used as the seal portion having easy-opening properties. However, the seal portion is not limited thereto, and the seal portion can be obtained by performing corona treatment except for the lower seal portion 13 or the upper seal portion 14. Can be easily opened. You may employ | adopt the seal part which gives easy-opening property to a some seal part according to the use of the packaging bag. Therefore, it is possible to realize a packaging material and a packaging bag in which a desired seal portion has easy-openability.

  Moreover, the layer structure essential for the packaging material of this invention is a base material layer and a thermoadhesive resin layer. Other layer configurations can be appropriately selected according to the inclusion. As the base material layer, in addition to a single resin layer, a laminate of various resins and papers can be adopted, and as the heat-adhesive resin layer, polyolefin resins such as polypropylene and polyethylene can be adopted. Moreover, although PE was used for bonding of a base material layer and a heat bondable resin layer in said embodiment, you may employ | adopt other adhesion | attachment means, such as an adhesive agent.

  Further, in the above-described embodiment, a part of the VMPET layer 22 other than the double-sided VMPET layer 22 to be provided as the back seal part 12 having easy opening is subjected to a partial corona treatment. If the partial corona treatment is performed, easy-openability can be imparted, so that the effect of the present invention is obtained.

  In addition, the seal width in the above-described embodiment is preferably as narrow as possible as long as the strength that prevents the pillow bag 10 from being opened at the time of transportation or the like can be ensured, for example, 1 to 20 mm, preferably 5 to 10 mm.

  In the above embodiment, a non-seal portion may be provided on at least a part of the outside of the back seal portion 12. FIG. 5 is a view showing an example of a pillow bag provided with a non-seal portion, and FIG. 6 is a development view seen from the inner surface side of the pillow bag of FIG.

  The pillow bag 10 ′ is made by sealing the sealing portion of one rectangular sheet-shaped packaging material 11 ′, as in the above embodiment. The seal portion includes a back seal portion 12, a lower seal portion 13, and an upper seal portion 14. This pillow bag 10 'also has a back seal portion 12 that is easily opened. The pillow bag 10 ′ is different from the pillow bag 10 of the above embodiment in that a non-seal portion 15 is provided outside the back seal portion 12.

  The packaging material 11 ′ has a rectangular shape as shown in FIG. 6, and the periphery is a seal portion. The non-seal part 15 is provided linearly along the outside of the back seal part 12. The width of the non-seal portion 15 is sufficient if it can be grasped with a finger, and is, for example, 2 mm or more, preferably 5 mm or more.

  The non-seal portion 15 may be either corona-treated or not. For example, in the case of imposition similar to FIG. 4, since the non-seal part 15 is located between the adjacent back seal parts 12 arranged in the width direction B, the non-seal part 15 is also the same as the back seal part 12. If the specification is such that the corona treatment is not performed, the number of corona treatment devices is reduced, and the efficiency is improved.

  Further, the shape and size of the non-seal part 15 are not particularly limited, and may be provided only on a part of the outside of the back seal part 12.

  According to such a pillow bag 10 ′, the consumer can easily open the back seal part 12 by picking the non-seal part 15 with a finger and pulling it with a clue.

  The non-seal portion may be provided outside the seal portion that provides easy opening. When the lower seal portion 13 or the upper seal portion 14 is provided with easy opening properties, the non-seal portion is provided outside the seal portion. What is necessary is just to provide.

  In the above embodiment, the pillow bag has been described as an example. However, the present invention can be applied to a three-side seal bag, a four-side seal bag, a gusset bag, a standing pouch, and the like. The thing of said embodiment can be used for the layer structure of a packaging material. In the following FIGS. 7 to 10, the hatched portion indicates the corona treatment portion.

  FIG. 7 is a view showing an example of the three-side seal bag of the present invention. The seal portion of the three-side seal bag 30 includes a right seal portion 31, a lower seal portion 32, and an upper seal portion 33. When the corona treatment is applied to the VMPET surface of the three-side seal bag 30, the right seal portion 31 is provided with an easy-opening property by performing a corona treatment except for the right seal portion 31. In addition, you may provide the non-seal part used as the clue at the time of opening in the outer side of the right seal part 31. FIG.

  FIG. 8 is a diagram showing an example of the four-side sealed bag of the present invention. The seal portion of the four-side seal bag 40 includes a right seal portion 41, a left seal portion 42, a lower seal portion 43, and an upper seal portion 44. When the corona treatment is applied to the VMPET surface of the four-side seal bag 40, the right seal portion 41 is subjected to a corona treatment so that the right seal portion 41 is easily opened. In addition, you may provide the non-seal part used as the clue at the time of opening in the outer side of the right seal part 41. FIG.

  FIG. 9 is a diagram showing an example of the gusset bag of the present invention. The seal portion of the gusset bag 50 includes a back seal portion 51, a lower seal portion 52, and an upper seal portion 53. On both sides of the gusset bag 50, there are folded portions 54 folded in a V shape. The gusset bag 50 is provided with easy-openability to the back seal portion 51 by performing corona treatment except for the back seal portion 51 when corona treatment is performed on the VMPET surface. In addition, you may provide the non-seal part used as the clue at the time of opening in the outer side of the back seal part 51. FIG.

  FIG. 10 is a diagram showing an example of a standing pouch according to the present invention. The sealing part of the standing pouch 60 includes a right seal part 61, a left seal part 62, a bottom seal part 63, and an upper seal part 64. The standing pouch 60 is provided with an easy-opening property to the upper seal part 64 by corona treatment except for the upper seal part 64 when corona treatment is performed on the VMPET surface. In addition, you may provide the non-seal part used as the clue at the time of opening in the outer side of the upper seal part 64. FIG.

  Since the packaging material of the present invention has a versatile structure in which a base material layer and a heat-adhesive resin layer are bonded together, a packaging bag using the packaging material is used for packaging foods, pharmaceuticals, and other industrial products. The form of inclusions can be widely used for solids, powders, liquids and the like.

It is a figure which shows an example of the pillow bag of this invention. It is the expanded view seen from the inner surface side of the pillow bag of FIG. It is the sectional view on the AA line of FIG. It is a figure which shows an example of the imposition of the packaging material of this invention. It is a figure which shows an example of the pillow bag which provided the non-seal part of this invention. It is the expanded view seen from the inner surface side of the pillow bag of FIG. It is a figure which shows an example of the three-side seal bag of this invention. It is a figure which shows an example of the four-sided seal bag of this invention. It is a figure which shows an example of the gusset bag of this invention. It is a figure which shows an example of the standing pouch of this invention.

Explanation of symbols

10 Pillow Bag 11 Packaging Material 12 Back Seal Part 15 Non-Seal Part 24 CPP Layer (Thermoadhesive Resin Layer)

Claims (5)

In a packaging material in which a base material layer and a heat-adhesive resin layer are bonded together,
When corona-treating the thermal adhesive resin layer side of the base material layer, excluding the thermal adhesive resin layer side of one base material layer that is matched as a seal part having easy-openability among the parts to be the seal part A packaging material characterized by corona treatment.   The packaging material according to claim 1, wherein a corona treatment is performed except for the thermal adhesive resin layer side of the other base material layer that is combined as a seal portion having easy-opening properties among the portions to be the seal portions. .   The packaging material according to claim 1 or 2, wherein a non-seal part is provided at least at a part of the outside of the seal part having the easy-opening property.   The packaging material according to any one of claims 1 to 3, wherein a seal portion having an easy-opening property is a back seal portion of a pillow bag among portions serving as a seal portion of the heat-adhesive resin.   The packaging bag using the packaging material in any one of Claims 1-4.

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