JPH0582534U - Easy-open pouch - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a refillable content pouch for liquid detergent, kitchen detergent, etc., which has good tear resistance when opened and drop impact resistance when stored for distribution. [Structure] An outermost layer of a biaxially stretched thermoplastic resin film or cellophane film printed on the back surface, a uniaxially stretched polyolefin film, a biaxially stretched nylon film, and an innermost layer of a polyolefin-based film are sequentially provided with an adhesive layer. Using the laminated laminated film, bag making is carried out in the same direction as the stretching direction of the uniaxially stretched polyolefin film and the tearing direction at the time of opening.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pouch for refill contents made of a laminated film of a thermoplastic resin used for liquid contents such as liquid detergents, kitchen detergents and softeners. Specifically, it has good tearing properties when opened. It relates to an easy-open pouch.

[0002]

[Prior Art]

 In recent years, as consumers have become more aware of the environment, their lifestyles have been revised, and consumer behavior has changed, and consumers are demanding packages that take environmental issues into consideration. From the viewpoints of environmental issues and effective use of resources, plastic product recycling movements and container reuse movements are becoming popular. Against this background of social conditions, it is necessary to use the same container body many times. Demand for refillable containers (containers with refillable contents) is growing. Examples of containers for liquid refill contents such as liquid detergent, kitchen detergent, and softener sold separately for this refillable container are pillow packaging (pillow bag) and standing pouch (bottom gusset type). A bag-shaped flexible package (pouch) having a capacity of 500 ml, 1000 ml, and 1500 ml using a laminated plastic film such as a self-standing bag) is widely used. This is because the plastic is lightweight, strong, transparent or colorable, easy to process and economical. When using the contents of these pouches, the pouch is generally opened by tearing it in parallel with the upper side of the pouch from a V-shaped notch provided at the upper end of the pouch. As a general conventional packaging material used for this pouch, [outer layer] biaxially stretched nylon layer (210) / printing ink layer (211) / adhesive layer (221) / uniaxially stretched as shown in FIG. A polyethylene film (220) / adhesive layer (231) / straight chain low density polyethylene layer (230) [inner layer] laminated film (200) is used, and the tear direction of the pouch is a uniaxially stretched polyethylene layer. The bag was manufactured so as to match the stretching direction of the film.

[0003]

However, the above-mentioned conventional laminated film has a low degree of surface treatment when the uniaxially stretched polyethylene layer of the constituent material is laminated (surface tension of 30 to 35 dyn / cm), and Due to bleeding (exudation phenomenon) of additives and the like, the adhesive strength between the constituent layers of the laminated film was weak, and the strength of heat sealing at both ends and the bottom of the pouch made into a bag was reduced. As a result, the openability at the time of opening was good, but there was a problem with drop impact resistance, and a bag breakage accident occurred due to dropping during distribution and storage of the product. Therefore, as a result of studying various structures for improving the drop impact resistance of the pouch, the inventors have found that the drop impact resistance is strong [outer layer] biaxially stretched nylon layer (310) / printing shown in FIG. Ink layer (311) / adhesive layer (341) / extruded polyethylene (340) / uniaxially stretched polyethylene layer (320) / extruded polyethylene (350) / linear low-density polyethylene layer (330) [inner layer] Developed a laminated film (300). However, although it was confirmed that the pouch produced using this laminated film had improved drop impact resistance when dropped, tear resistance when opened was reduced. Therefore, the inventors further studied various configurations and finally arrived at the present invention. The present invention provides an easy-open pouch that has good drop impact resistance during a drop test and is easy to tear when opened.

[0004]

[Means for Solving the Problems]

 As shown in FIG. 1, the present invention comprises a biaxially stretched thermoplastic resin film (110) or cellophane film as an outermost layer having a printing ink layer (111) formed on the back surface thereof, and a uniaxially stretched polyolefin film (120). A biaxially stretched nylon film (160) and a polyolefin-based film (130) of the innermost layer are sequentially laminated with an adhesive layer (121, 161, 131) between them to form a laminated film (100). An easily openable pouch made into a bag by aligning the tearing direction at the time of opening with the same direction as the stretching direction of the uniaxially stretched polyolefin film.

A stretched nylon film, a stretched polyester film, a stretched polypropylene film or the like may be used as the outermost biaxially stretched thermoplastic resin film. Further, a stretched polyethylene film or a stretched polypropylene film may be used as the uniaxially stretched polyolefin film, and a heat sealant layer such as polyethylene, polypropylene or ethylene-vinyl acetate resin may be used as the innermost layer polyolefin film. is there.

Although the adhesive layer is mainly formed by using an ester type polyurethane adhesive, a vinyl type, acrylic type, polyamide type, epoxy type or rubber type adhesive may also be used. good.

[0007]

[Action]

 When a biaxially stretched nylon layer is used for the laminated constituent layers inside the laminated film as in the present invention, due to the toughness and high impact strength of the biaxially stretched nylon layer, the pouch made from the laminated film is subjected to a drop test. The drop impact strength of is improved. However, since this biaxially stretched nylon layer has a weak tear strength, the tearing directionality of the uniaxially stretched polyolefin layer at the time of opening the pouch is not impaired, and the pouch openability is improved.

[0008]

【Example】

 FIG. 1 is a cross-sectional view showing a laminated structure of a laminated film according to the present invention used in this example, and FIG. 4 is a perspective view of an easily openable standing pouch of this example produced using the laminated film. Is. Next, embodiments will be described in detail with reference to the drawings.

First, characters and patterns are printed on a 15 μm-thick biaxially stretched nylon film by a gravure printing method, and a 25 μm-thick uniaxially stretched polyethylene film is applied to the printed surface by a dry lamination method using an ester-type polyurethane adhesive. Then, a 15 μm thick biaxially stretched nylon film is laminated on the uniaxially stretched polyethylene film surface using an ester type polyurethane adhesive by a dry lamination method, and further, a 120 μm straight film is laminated on the biaxially stretched nylon film surface. A chain-like low density polyethylene film was laminated by a dry lamination method using an ester type polyurethane adhesive, and the [outer layer] biaxially stretched nylon layer (110) / printing ink layer (111) / Adhesive layer (121) / uniaxially stretched polyethylene layer (120) Adhesive layer (161) / biaxially oriented nylon layer (160) / adhesive layer (131) / linear low density polyethylene (130) [inner] configuration of the laminated film (100) was prepared.

Next, using the produced laminated film, a tearing direction at the time of opening was adjusted in a bag-making machine in the same direction as the stretching direction of the uniaxially stretched polyolefin film in the constitution, and The side edges and the bottom are heat-sealed, and a standing pouch type package having a width of 170 mm and a height of 265 mm with an open upper side is formed into a bag. A V-shaped notch (401) was cut at the opening position, filled with 1000 ml of water, and the upper side was heat-sealed to seal the standing pouch (400) shown in FIG.

Further, for comparative evaluation with the pouch of the embodiment of the present invention, [outer layer] 25 μm thick biaxially stretched nylon layer (210) / printing ink layer (211) / adhesive layer (221) shown in FIG. ) / 25 μm thick uniaxially stretched polyethylene layer (220) / adhesive layer (231) / 130 μm thick linear low-density polyethylene layer (230) [inner layer] A conventional laminated film (200) and the structure shown in FIG. [Outer layer] 25 μm thick biaxially stretched nylon layer (310) / printing ink layer (311) / adhesive layer (341) / 20 μm thick extruded polyethylene (340) / 25 μm thick uniaxially stretched polyethylene layer (320) / 20 μm thick Extruded polyethylene (350) / 130 μm thick linear low-density polyethylene layer (330) [inner layer] Study prototype laminated film with improved drop impact resistance (300 By making two types of laminated film was produced comparative pouch similar to the pouch of the previous mentioned examples using these laminated films.

Next, the physical properties of the produced three types of laminated films and the three types of pouches made by using the laminated films were comparatively evaluated. For the laminated film, the peel strength between each layer was measured with a Tensilon tensile tester, and the results are shown in Table 1. For the pouch, heat seal strength (side and bottom) and drop strength (filled with 1000 ml of water). , And the tear strength at the time of opening (Elemendorff method) were measured, and the results are shown in Table 2.

[0013]

[Table 1]

[0014]

[Table 2]

From the results shown in Tables 1 and 2, the pouches using the conventional laminated laminated film have good tearability at the time of opening, but the strength between the constituent layers, the heat seal strength, and the drop strength are low. There was a weak problem, and the pouch using the laminated film of the trial construction had strong interlaminar strength, heat seal strength, and drop strength, but had a problem of poor tearability when opened. On the other hand, the pouch using the laminated film having the constitution of the present invention had strong interlaminar strength, heat seal strength, and drop strength, and also had good tearability when opened.

[0016]

[Effect of the device]

 As described in the above examples, the pouch of the refillable contents produced by using the laminated film having the constitution of the present invention has the strength between the constituent layers, the heat seal strength and the drop strength, and moreover when opened. Has good tearability.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a laminated structure of a laminated film according to the present invention used in Examples.

FIG. 2 is a cross-sectional view showing a laminated structure of a laminated film of a conventional pouch.

FIG. 3 is a cross-sectional view showing a laminated structure of a laminated film that has been studied and prototyped.

FIG. 4 is a perspective view of an easy-open standing pouch of the present invention manufactured in an embodiment.

[Explanation of symbols]

100, 200, 300 ... Laminated film 110, 210, 310 ... Biaxially stretched nylon 111, 211, 311 ... Printing layer 120, 220, 320 ... Uniaxially stretched polyethylene layer 121, 131, 161, 221, 231, 341 ……
Adhesive layer 160: Biaxially stretched nylon layer 130, 230, 330: Linear low density polyethylene layer 340, 350: Extruded polyethylene 400: Pouch 401: V-shaped notch

Claims (1)

[Scope of utility model registration request] 1. An outermost layer of a biaxially stretched thermoplastic resin film or cellophane film, a uniaxially stretched polyolefin film, a biaxially stretched nylon film, and an innermost layer of a polyolefin-based film are sequentially provided with an adhesive layer between them. An easy-open pouch, characterized in that the laminated film is laminated to make a bag in the same direction as the stretching direction of the uniaxially stretched polyolefin film and the tearing direction at opening is matched.