Structure of fluid container and method and apparatus for producing the fluid container

Abstract

A fluid container for packing a product includes a check valve for each container member. A bonding structure of check-valves to a fluid container and a production method and apparatus of fluid container are disclosed in detail where the check valve is capable of reliably keeping the expansion of the fluid container without any fluid leakage after inflating the fluid container. As the check-valve is bonded to only one of thermoplastic container films, both films of the check-valve are fixed to one of the container films, thereby preventing the reverse flow by tightly closing the check valve. The manufacturing apparatus includes an up-down roller controller which precisely positions the films to form the check valve. The manufacturing apparatus can produce the fluid container with high reliability by having a belt conveyor specially designed for cooling down the heat sealed films before separating from the belt conveyor without damage.

Description

FIELD OF THE INVENTION [0001] This invention relates to a structure of a fluid container and a manufacturing apparatus for producing the fluid container, and more particularly, to a bonding structure of the check valve capable of reliably keeping the expansion of the fluid container without any fluid leakage after inflating the fluid container and to the production method and apparatus to produce the fluid container incorporating the bonding structure of the check valves. BACKGROUND OF THE INVENTION [0002] A styroform packing material has been used for a long time for packing commodity and industrial products. Although the styroform package material has a merit such as a good thermal insulation performance, it has also various disadvantages: recycling the styroform is not possible, soot is produced when it burns, a flake or chip comes off when it is snagged because of it's brittleness, an expensive mold is needed for its production, and a relatively large warehouse is necessary to s...

AI Technical Summary

Benefits of technology

[0017] It is, therefore, an object of the present invention to provide a structure of fluid container and a method and apparatus for producing the fluid containers with high efficiency and high reliability.

[0018] It is another objected of the present invention to provide a bonding structure of an in-line check-valve formed in fluid members of a fluid container, which is capable of reliably keeping the expansion of the fluid container without any fluid leakage after inflating the fluid container.

[0021] The check valve is bonded to one of the first or second container film for tightly closing the check valve when a reverse flow of the fluid is about to occur, thereby preventing the reverse flow. Accordingly, both two films of the check valve are curved in the same manner as one of the container film to which the check valve is bonded when the fluid container is inflated. Thus, the two bonded films of the check valve are tightly sealed and the expansion of the fluid container is reliably maintained after the fluid container is inflated.

[0024] According to the present invention, the structure of check valves to be bonded to the fluid container and the production apparatus for producing the fluid containers enable the fluid container of reliably keeping the expansion of the fluid container without any fluid leakage after inflating the fluid container. The up-down roller controller in the manufacturing apparatus for producing the fluid containers can precisely position the films to firmly form the in-line check valve. Also, the belt conveyer in the manufacturing apparatus helps to form the heat seal portions without creases. As a result, the manufacturing apparatus in the present invention can produce the fluid containers of high reliability and low cost.

Problems solved by technology

Although the styroform package material has a merit such as a good thermal insulation performance, it has also various disadvantages: recycling the styroform is not possible, soot is produced when it burns, a flake or chip comes off when it is snagged because of it's brittleness, an expensive mold is needed for its production, and a relatively large warehouse is necessary to store it.

Thirdly, the fluid container does not produce a chip or dust which has adverse effect on precision products.

This is a serious problem of the fluid containers in the conventional technology.

There is another problem which is involved in the production of the fluid containers.

This problem is related to the installation of the check valves: it is not easy to accurately attach the check valve to each container member of the fluid container film.

Therefore, the inaccurate installation of the check valve also sometimes causes a leakage problem.

However, since there are leakage and other problems in the fluid containers as described above, it is necessary to improve the performance of check valves in the fluid container and the production efficiency for producing the fluid containers to reduce the overall cost.

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