JPS636037Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to bag-in boxes.

[Conventional technology]

In recent years, it has been made up of an inner bag and a carton, in which a valve is fixed to a predetermined position of the bag body, which is made by welding the periphery of two square synthetic resin films. A bag-in box with a nozzle screwed onto it is used. However, with the inner bag whose four circumferences are welded as described above, the inner bag and carton are integrated by screwing a nozzle onto the valve from the outside through a through hole in the carton, which is fixed to the inner bag. Because of this, when the inner bag is inflated, wrinkles form around the valve part. This is because the inner bag is welded on all four sides in a rectangular shape, and only the valve part is fixed to the inner surface of the carton, so this is caused by the excess part of the bag due to the expansion of the inner bag. Particularly, unnatural and unreasonable wrinkles are formed around the part where the valve is fixed and near the upper corner of the bag body.

For this reason, when the inner bag is filled with liquid and transported, the pressure of the liquid due to vibration is constantly and repeatedly applied to this unreasonable wrinkled area, causing pinholes to occur due to bending in this area due to the repeated pressure. This caused the problem that it became easier to do so.

[Problem that the invention attempts to solve]

Therefore, the problem that the present invention aims to solve is to provide a bag-in box that reduces the occurrence of wrinkles when the inner bag is inflated.

[Means for solving problems]

The bag-in box of the present invention consists of an inner bag in which a valve is fixed to a predetermined position of a bag made by welding the periphery of two square synthetic resin films, and a bag-in box carton with an inclined surface. To reduce the occurrence of wrinkles around a part to which a valve is fixed when the inner bag is inflated in a bag-in box in which a nozzle is screwed onto a valve which projects outward from a through hole in an inclined surface of a carton. As shown, diagonal welded portions are provided near both corners of the bag.

That is, the mountain-shaped welded part on the valve mounting side and the attachment of this valve part to the inclined surface of the carton work together to prevent wrinkles from forming near the valve mounting part of the inner bag of the bag-in-box. It is something.

[Effect]

The oblique welded portions serve to prevent wrinkles from forming at both corners of the inner bag when the inner bag is inflated, and to reduce the occurrence of wrinkles around the valve fixing portion.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 2, the two synthetic resin films 2 and 3 that make up the inner bag 1 are welded together around them. They are welded at welded portions 5 and 6 that are oblique in the shape of a mountain. The corner portions defined by the oblique welds 5 and 6 can be used as gripping portions in the manufacturing process, making manufacturing easier.

As the material for the synthetic resin film, a laminated film of oriented polypropylene (OPP)/vinylidene coated oriented nylon (KON)/polyethylene (PE) is used.

In order to incorporate such an inner bag 1 into a bag-in-box carton 7 having an inclined surface 9 as shown in FIG. A valve 4 made in the inner bag 1 is inserted into the through hole provided in the inner bag 1.
The carton blank and the inner bag are integrated by inserting the nozzle 8 into the valve 4 from the outside, and then inserting the carton blank into the carton 7.
Assemble it.

[Effect of idea]

As described above, the inner bag according to the present invention is welded in a mountain shape on both sides where the valve is attached, and when this inner bag is attached to a carton and assembled, as shown in FIG. The valve is made to protrude outward from the through hole in the inclined surface of the carton,
Since the nozzle is screwed into this valve from the outside, the fact that the inner bag has a mountain-shaped welded part and the inner bag is attached to the side slope of the carton combine to prevent the liquid from flowing inside. Even if the inner bag inflates, there are no corners and it will not bend excessively, so wrinkles are less likely to occur. This means that there are fewer pinholes caused by repeated refraction at the wrinkles, resulting in excellent durability.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the bag-in box according to the present invention, FIG. 2A is a plan view of the inner bag, and FIG. 2B is a side view thereof. DESCRIPTION OF SYMBOLS 1... Inner bag, 2, 3... Synthetic resin film constituting the inner bag, 4... Valve, 5, 6... Welded portion, 7... Carton, 8... Nozzle, 9... Slanted view.

Claims (1)

[Scope of utility model registration request] It consists of an inner bag in which a valve is fixed to a predetermined position of a bag body made by welding the peripheries of two square synthetic resin films, and a bag-in-box carton with an inclined surface, and the valve is attached to a through hole in the inclined surface of the carton. In a bag-in box in which a nozzle is screwed onto a valve that protrudes further outward, both sides of the bag body are designed to reduce the occurrence of wrinkles around the part where the valve is fixed when the inner bag is inflated. A bag-in box characterized by having a diagonal welded part near the corner.