JPH0571142U - Easy tear pouch - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] Improves tearability when opened in plastic pouches used for liquid contents such as liquid detergents, kitchen detergents and softeners. A parallelogram-shaped pouch made of a thermoplastic resin laminated film 100, wherein the outer layer is a biaxially stretched film 110 layer of any one of polyester, nylon and polypropylene, and the intermediate layer is one of polyethylene and polypropylene. The uniaxially stretched film layer stretched in the direction substantially perpendicular to one side of the pouch or the rolled rolled film layer, and the inner layer is the easily tearable sealant 130 layer.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pouch made of a laminated film of a thermoplastic resin used for liquid contents such as liquid detergents, kitchen detergents and softeners. More specifically, it is an easily tearable pouch that tears easily when opened. It is about.

[0002]

[Prior Art]

 Recently, transparent or colored plastic square pouches have been widely used as refill containers for liquid contents such as liquid detergents, kitchen detergents and softeners. This is because plastic is lightweight, strong, transparent or colorable, easy to process and economical. When using the contents of the pouch, the pouch contents are generally opened by tearing parallel to the upper side of the pouch from the V-shaped notch provided at the upper end of the pouch. As a method of neatly opening and a method of easily tearing at the time of opening, a method of using a uniaxially stretched film as a base material of a pouch disclosed in JP-A-56-53068 and a method disclosed in JP-A-1-116464 are disclosed. There is a method using the biaxially stretched film.

[0003]

[Problems to be solved by the device]

 However, as shown in FIG. 2, when a commonly used pouch (200) is torn and opened in parallel with the upper side of the pouch from the V-shaped notch (230) provided on the upper side end, A so-called "cross tear" phenomenon (260) may occur in which the laminating film (210) on the front side of the pouch and the laminating film (220) on the opposite side of the pouch have different tear directions. When the “fork tear” phenomenon occurs, the cutout portion (250) may not be separated from the pouch, which is an obstacle when using the contents. In addition, if the “forge” phenomenon becomes large, the contents may overflow from the pouch when opened.

In the method of using a uniaxially stretched film as the pouch base material disclosed in Japanese Patent Laid-Open No. 56-53068, when the “fork tearing” phenomenon occurs, the cutting side corresponding to the opening start side of the pouch. If the cross tear width (h) becomes 5 mm or more inside the seal portion (242) of the above, it is empirically impossible to separate the cutout portion from the pouch by hand. Biaxially stretched film is generally used as a surface base material of the laminated film of the pouch for safety in handling during transportation and storage.

In the method using the biaxially stretched film disclosed in Japanese Patent Application Laid-Open No. 1-116664, the tearing direction is specified even if the V-shaped notch position on the opening start side of the pouch is the same. For example, when tearing to the front side, both the front and back laminated films are torn parallel to the upper side and the cutout is easily cut, but when the same notch is torn to the other side. At the same time, a large "fore splitting" phenomenon occurs, and the cut portion cannot be cut.

[0006]

[Means for Solving the Problems]

 The present invention solves the above-mentioned defective cutting of the cut-out portion due to the "fork split" phenomenon when the pouch is opened by the pouch layer structure.

A first aspect of the present invention is a parallelogram-shaped pouch made of a laminated film of a thermoplastic resin, the outer layer of which is either polyethylene or polypropylene and is uniaxially stretched in a direction substantially perpendicular to one side of the pouch. A stretched film layer or a rolled rolled film layer, and an easily tearable pouch in which the inner layer is an easily tearable sealant layer.

A second aspect of the present invention is a parallelogram-shaped pouch made of a laminated film of thermoplastic resin, the outer layer of which is a biaxially stretched film layer of any one of polyester, nylon and polypropylene as shown in FIG. (110), the middle layer is a uniaxially stretched film layer or a rolled film layer (120) rolled in a direction substantially perpendicular to one side of the pouch, and the inner layer is an easily tearable sealant layer. An easily tearable pouch consisting of (130).

The one side of the pouch that makes the stretching or rolling direction substantially at right angles means one side on the opening start side or one side on the opposite side.

Further, the easily tearable sealant layer is a single layer or a multiple layer, which promotes crystallization, has increased rigidity, and has a contact surface which is heat-sealed by thermocompression bonding. Therefore, the thickness of the layer is preferably 80 μm or less in consideration of elongation and the like.

[0011]

[Action]

 The pouch of the present invention has a uniaxially stretched film layer stretched in the tearing direction or a rolled film layer on the outside of the tearable sealant layer having good tearability and high rigidity. Acts synergistically during tearing to suppress the "fore tearing" phenomenon to a small extent, and even if the width of the fore tear is slightly larger inside the seal on the cutting side that corresponds to the opening start side of the pouch, the tearability is increased. Since it is separated from the good and rigid tearable sealant layer, the cut portion can be easily cut.

[0012]

【Example】

 First, letters and patterns are printed on a 25 μm thick biaxially stretched nylon film by a gravure printing method, and a 25 μm thick rolled polyethylene film is laminated on the printed surface by a dry lamination method using a urethane-based adhesive. 80 µm thick linear low-density polyethylene-based easy-cleavable sealant was laminated on the rolled polyethylene film surface using the urethane AC agent by the extrusion lamination method, and the biaxial [surface] shown in Fig. 1 was used. A laminated film (100) having a structure of stretched nylon film (110) / rolled polyethylene film (120) / easily tearable sealant (130) [back surface] was prepared.

Next, using the produced laminated film, the back surfaces are heat-sealed together with a bag-making machine, and a square bottom gusset type book having a width of 120 mm and a length of 260 mm shown in FIG. A pouch (200) of the invention was prepared, filled with 500 ml of water, and the mouth portion was heat-sealed and hermetically sealed. The rolled polyethylene film of the intermediate layer is formed into a bag so that the rolling direction is as perpendicular as possible to the vertical side of the pouch, and a V-opening is provided on the left end of the seal part (241) on the left side of the pouch. A notch (230) was inserted.

Furthermore, in order to compare and evaluate with the pouches of the examples of the present invention, [front surface] biaxially stretched nylon film (25 μm) / easily tearable sealant (80 μm) [back surface] constitution (comparison A) [Surface] Biaxially stretched nylon film (25 μm) / rolled polyethylene film (25 μm) / general linear low-density polyethylene layer (80 μm) [rear surface] composition (comparative B) Using these laminated sheets, a pouch for comparison was prepared in the same manner as the pouch of the above-mentioned embodiment of the present invention.

Next, in order to evaluate the three types of prepared pouches, a “fork tear” state was observed when the pouch was torn from the V-shaped notch at the upper left end of each pouch, and the cutout part was pouched. The maximum value of the tear strength when cut from the seal on the right side of was measured. The results are shown in Table 1.

[0016]

[Table 1]

Considering from Table 1, the pouch of the present invention of the embodiment shows that the tearing direction is small on both the front side and the other side, and the tear strength is small, so that the cut portion is easy to tear. ing. This is obtained by the synergistic effect of the rolled polyethylene fill of the present invention and the easily tearable sealant. Next, in the comparative pouch A, since the width of the fork is different depending on the tearing direction and is large and the breaking strength is very large, it becomes impossible to cut the cut portion by hand. This is because there is no uniaxially stretched or rolled directional film, and the easily tearable sealant alone is affected by the orientation of the biaxially stretched nylon film. Further, looking at the results of the comparative pouch B, when the general linear low-density polyethylene sealant layer was used, it became difficult to cut the cut portion when the width of the fork was 5 mm or more. The limit of the tear strength at which the cut portion can be cut by hand was 2.5 kg.

[0018]

[Effect of the device]

 When the easily tearable pouch of the present invention is used to open the contents for tearing the pouch from the notch for opening the pouch, the synergistic effect of the uniaxially stretched or rolled polyethylene and the easily tearable sealant is obtained. As a result, the tear width is small and the tear strength is small both on the front side and on the other side, so the cut part is easy to tear.

[Brief description of drawings]

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

FIG. 2A is a front view of the pouch, and FIG.
It is explanatory drawing which shows the state when the "fork tearing" phenomenon generate | occur | produces when a pouch is opened.

[Explanation of symbols]

 100, 210, 220 ... Laminated film 110 ... Biaxially stretched film 120 ... Uniaxially stretched or rolled film 130 ... Easy tear sealant 200 ... Pouch 230 ... Notch 241, 242 ... Seal part 250 ... Cutting Part 251 .. Forging width 260 .. "Forging" phenomenon

Claims (2)

[Scope of utility model registration request] 1. A parallelogram-shaped pouch made of a laminated film of a thermoplastic resin, the outer layer of which is either polyethylene or polypropylene and is a uniaxially stretched film layer or rolled in a direction substantially perpendicular to one side of the pouch. An easily tearable pouch, wherein the rolled film layer and the inner layer are made of an easily tearable sealant layer. 2. A parallelogram-shaped pouch made of a thermoplastic resin laminated film, wherein the outer layer is a biaxially stretched film layer of any one of polyester, nylon and polypropylene, and the intermediate layer is one of polyethylene and polypropylene. An easily tearable pouch, wherein the uniaxially stretched film layer or rolled rolled film layer stretched in a direction substantially perpendicular to one side of the pouch, and the inner layer is an easily tearable sealant layer.