Structure of check valve for air-packing device

Abstract

A check valve for an air-packing device comprises upper and lower check valve films that are placed between upper and lower packing films that form the air-packing device contour. The check valve can be advantageously used for the air-packing device having a multiplicity of air containers. A common air duct that allows compressed air to flow into each air container through the check valve is formed between the upper and lower check valve films independently from other films such that the check valve can be placed flexibly in the air-packing device. Peeling agents are applied between the upper and lower check valve films to create the common air duct by preventing heat-sealing between the films. Air passages are formed in each check valve between air guide seals and separation seals.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view showing an example of basic structure of an air-packing device in the conventional technology.

FIG. 2 is a plan view of the air-packing device of FIG. 1 when it is not inflated for showing bonding areas for closing two thermoplastic films.

FIG. 3 is a schematic cross sectional view showing an example of structure of the air-packing device and check valve under the present invention.

FIGS. 4A and 4B are plan views showing the air-packing device and the check valve under the present invention where sealed areas are hatched in FIG. 4A to indicate the sealing among the thermoplastic films while in FIG. 4B, the sealed areas are not hatched to show functional components of the air-packing device.

FIG. 5 is a plan view showing an upper check valve film and a lower check valve film to indicate the relationship between the peeling agent and the heat-seals in the present invention.

FIG. 6 is an enlarged perspective view of the upper packing film, the lower packing film, the upper check valve film, and the lower check valve film to show the inner structure of an embodiment of the air-packing device of the present invention.

FIG. 7 is a plan view showing the air-packing device having the check valve under the present invention illustrating arrows that indicate the flow of the compressed air when the compressed air is supplied to the air input to inflate the air-packing device.

FIGS. 8A and 8B are cross sectional views of the air-packing device having the check valve under the present invention illustrating arrows that indicate the flow of the compressed air when the compressed air is supplied to the air input to inflate the air-packing device.

FIG. 9 is an enlarged perspective view of the upper packing film, the lower packing film, the upper check valve film, and the lower check valve film in the embodiment of the air-packing device under the present invention where the arrows indicate the flow of the compressed air when the compressed air is supplied to the air input to inflate the air-packing device.

FIGS. 10A and 10B are simplified cross-sectional views of the check valve and the air packing device under the present invention to illustrate the basic operation of the check valve.

FIGS. 11A-11B are plan views showing alternative examples of the check valve under the present invention where FIG. 11A shows the check valve where three air guide seals are aligned, and FIG. 11B shows the check valve where one of the air guide seals is prolonged.

FIGS. 12A-12C are plan views showing still other alternative examples of the check valve under the present invention where FIG. 12A shows the check valve where four air guide seals are aligned, FIG. 12B shows the check valve where the air guide seals have the shape of a line with circles at both ends, and FIG. 12C shows the check valve where the air guide seals have the shape of a thick straight line.

Claims

1. A structure of check valves for use in an air-packing device for packing a product, comprising: a plurality of air containers each being made of upper and lower packing films by applying separation seals where a check valve is provided to each air container;upper and lower check valve films for forming a plurality of check valves where peeling agents of predetermined pattern are applied between the upper and lower check valve films, the upper and lower check valve films being attached to one of the upper and lower packing films;an air input established by one of the peeling agents on the air-packing device for receiving an air from an air source;an air passage formed in each check valve by heat-seals between the upper and lower check valve films by two or more air guide seals, the air passage including a narrow channel formed by the separation seal and the air guide seal between the upper and lower check valve films; anda common air duct formed between the upper and lower check valve films for providing the air from the air input commonly to the plurality of check valves;wherein heat-sealing between the upper and lower check valve films is prevented in a range where the peeling agent is applied, thereby creating the common air duct.

2. A structure of check valves as defined in claim 1, wherein each of the air guide seals has a V-shape with a flat base and wings of the air guide seal are located close to the separation seals to create the air passages between the separation seals and the wings of the air guide seals.

3. A structure of check valves as defined in claim 1, wherein the wings of the air guide seal are arranged to gradually narrow the air passage between the wings of the air guide seal and the separation seal.

4. A structure of check valves as defined in claim 1, wherein the two or more air guide seals each having a V-shape with a flat base are aligned with one another along the air container.

5. A structure of check valves as defined in claim 1, wherein two or more air guide seals each having a V-shape with a flat base and with an identical size with one another are aligned along the air container.

6. A structure of check valves as defined in claim 1, wherein at least two air guide seals are provided, and one air guide seal is shaped in a V-shape with a flat base and wings of the air guide seal are located near adjacent separation seals, and another air guide seal is shaped in a V-shape with a flat base and elongated wings.

7. A structure of check valves as defined in claim 1, wherein the air guide seal has a shape of a line with circular ends, and the circular ends are close to the separation seals to create narrow air passages between the circular ends and the separation seals.

8. A structure of check valves as defined in claim 1, wherein the air guide seal has a shape of a thick line, and its ends are close to the separation seals to create narrow air passages between the ends and the separation seals.

9. An air-packing device for packing a product therein, comprising: a plurality of air containers each being made of upper and lower packing films by applying a pair of separation seals where a check valve is formed for each air container;a plurality of air cells formed in a series manner in each container by partially bonding the upper packing film and the lower packing film by applying folding seals;upper and lower check valve films for forming a plurality of check valves where peeling agents of predetermined pattern are applied between the upper and lower check valve films, the upper and lower check valve films being attached to one of the upper and lower packing films;an air input established by one of the peeling agents on the air-packing device for receiving an air from an air source;an air passage formed in each check valve by heat-seals between the upper and lower check valve films by two or more air guide seals, the air passage including a narrow channel formed by the separation seal and the air guide seals between the upper and lower check valve films; anda common air duct formed between the upper and lower check valve films for providing the air from the air input commonly to the plurality of check valves;wherein heat-sealing between the upper and lower check valve films is prevented in a range where the peeling agent is applied, thereby creating the common air duct.

10. An air-packing device for packing a product therein as defined in claim 9, wherein the each of the air guide seals has a V-shape with a flat base and wings of the air guide seal are located close to the separation seals to create the air passages between the separation seals and the wings of the air guide seals.

11. An air-packing device for packing a product therein as defined in claim 9, wherein the wings of the air guide seal are arranged to gradually narrow the air passage between the wings of the air guide seal and the separation seal.

12. An air-packing device for packing a product therein as defined in claim 9, wherein the two or more air guide seals each having a V-shape with a flat base are aligned with one another along the air container.

13. An air-packing device for packing a product therein as defined in claim 9, wherein the two or more air guide seals each having a V-shape with a flat base and with an identical size with one another are aligned along the air container.

14. An air-packing device for packing a product therein as defined in claim 9, wherein at least two air guide seals are provided, and one air guide seal is shaped in a V-shape with a flat base and wings of the air guide seal are located near adjacent separation seals, and another air guide seal is shaped in a V-shape with a flat base and elongated wings.

15. An air-packing device for packing a product therein as defined in claim 9, wherein the air guide seal has a shape of a line with circular ends, and the circular ends are close to the separation seals to create the narrow air passages between the circular ends and the separation seals.

16. An air-packing device for packing a product therein as defined in claim 9, wherein the air guide seal has a shape of a thick line, and its ends are close to the separation seals to create the narrow air passages between the ends and the separation seals.