JPH078263U - Liquid storage bag - Google Patents

Abstract

(57) [Summary] [Purpose] Regarding a liquid storage bag used as an internal bag body of a bag-in-box, etc., the occurrence of scratches due to friction between the bag body and the outer box and the strength of the bag body. The purpose is to prevent decline. [Structure] The above object can be achieved by subjecting the outermost surface of a polymer film forming the outermost layer of a single-layer or multi-layer bag to an uneven process.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a liquid storage bag with an inlet / outlet port used as an inner bag of a bag-in-box (hereinafter abbreviated as BIB), and in particular, a bag body having a single layer or a plurality of films stacked on each other and having a peripheral edge thereof. It relates to the structure of a bag having a multiple structure in which parts are welded together.

[0002]

[Prior art]

 Conventionally, liquid drum containers and thick-walled containers made of polymer in the case of relatively small volumes have generally been used as liquid transportation containers. However, recently, due to resource saving, energy saving, and various environmental requirements, a simple yet reliable transportation form has been sought. The BIB liquid transport container according to the present invention is also in line with this concept.

[0003] For safety, a container using this method is formed by stacking a plurality of (usually 2 to 3) polymer films having a high tear strength, welding the peripheral edges together, and injecting and pouring holes at appropriate locations. The structure with the attached is generally adopted. It is lightweight, has high sealing performance, is resistant to vibration impact, and has the advantages that it can be folded when storing only the bag before storing the liquid, and it does not take up much space for storing the container. It is attracting attention as a system container.

Since the storage bag is soft as it is, is easily damaged, and is inconvenient to handle, the storage bag is further stored in a corrugated ball box and transported. By combining multiple containers in this way, it is possible to stack up to 5 to 6 steps without a middle frame, and the bag made of high molecular film is less likely to be scratched and transport safety is further enhanced. This is also the reason why it is called "Bag in Box" transportation method.

[0005]

[Problems to be Solved by the Invention] However, this BIB container is still in various trial stages, leaving some problems to be solved in detail.

One of the problems is the occurrence of scratches due to friction between the inner bag and the outer box and the resulting decrease in strength. The present invention relates to a bag structure for coping with such a problem.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the liquid storage bag of the present invention is provided with irregularities on the outermost surface of the polymer film of the outermost surface of the single-layer or superposed multiple sheets, that is, only on the outermost surface. It can be achieved by embossing.

[0008]

[Action]

 With the above structure, the liquid storage bag of the present invention minimizes the friction area between the box body and the bag body when stored in the box body such as a corrugated ball, and keeps the friction area to a small range, thereby scratching the entire body. Pinholes are less likely to occur due to running.

Further, the uneven pattern provided on the outermost side has an unexpected effect when a liquid, especially a high temperature liquid, is rapidly filled with the bag body housed in the box body. That is, when the high temperature liquid is filled, the polymer film in the bag temporarily becomes very soft and tends to adhere to the inside of the box. In this case, the outer surface of the bag and the inner surface of the bag are in intimate contact with each other in the case of the bag having no uneven pattern. And there is no slippage.

[0010] Further, since there are few escape paths for air at the bottom of the box, the bottom of the packaging bag often does not fit evenly and exactly on the bottom of the box. This phenomenon was especially observed when the liquid was hot and was stored rapidly.

However, when an uneven pattern is provided as in the present invention, the bag body does not adhere to the box body entirely, the air at the bottom escapes through the pattern gap, and the bag is smoothly filled. It was Here, the pattern provided on the outer surface of the bag body is not particularly limited. Cloud shapes, geometric patterns, honeycomb patterns, etc. are generally good.

As the material of the film forming the bag body, a polymer film is generally used, and particularly a thermoplastic polyolefin film having high tear strength is used. Normally, the innermost and outermost two-layer structures are often used. However, when strength is particularly required, three-layer structure may be used, and it is selected in consideration of the properties of the content liquid and transportation conditions.

In any case, in the case of the present invention, the object can be achieved by forming an uneven pattern on the outer surface of the outermost layer of the bag body, which is in contact with the box body. If the depth of the uneven pattern is 0.05 to 1.0 mm, particularly preferably 0.1 to 0.3 mm, the effect is exhibited. Need not be too deep

[0014]

【Example】

 FIG. 1 shows a so-called water pillow-shaped liquid storage bag (a) (content 20 liters) in which three relatively thin films are stacked and the four sides are sealed. The outermost film, which is the outermost layer, has a mesh pattern with straight lines that intersect in advance. This pattern could be applied to the container at any depth by heat rolling during the production of the outermost sheet (polyethylene).

[0015]

[Effect of device]

 According to the present invention, by providing the outermost surface of the liquid storage bag with the uneven pattern as described above, the bag body is less likely to be damaged due to the contact between the bag body and the box body, and the occurrence of pinholes is reduced. In addition, the air at the bottom of the box at the time of injection became easy to escape, and there was no liquid leakage.

[Brief description of drawings]

FIG. 1 (a): Appearance of three-layer structure bag (b); Vertical cross-sectional view taken along the line A-A ′ in (b) (c); Enlarged view of the circled part in (b) (3) (Shows the layer structure and the unevenness of the outermost surface)

[Explanation of symbols]

 1 Outermost layer film 1a (Outer surface of outermost layer film: surface with unevenness) 1b (Inner surface of outermost layer film) 2 Intermediate layer film 3 Innermost layer film 4 Edge-sealed portion 5 Filling liquid 11 Liquid injection, exit hole 12 Same as above

Claims (2)

[Scope of utility model registration request] 1. A liquid storage bag in which a peripheral portion of a polymer film is welded and a liquid storage bag body provided with a liquid inlet / outlet is provided with an uneven pattern on the outermost surface thereof. 2. A liquid storage bag comprising a bag body having a multiple structure in which a plurality of films are superposed and the peripheral portions of these films are collectively welded, and a pouring port is provided in the bag. Liquid storage bag with an embossed outer surface.