Patent ID: 7481252

Claim:
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, the upper and lower check valve films being attached to one of the upper and lower packing films; an air passage formed in each check valve by heat-seals between the upper and lower check valve films, the air passage including a narrow channel formed by the separation seal and one of the heat-seals between the upper and lower check valve films; obstruction seals which provide resistance against the flow of the air in the check valves, and air guide seals which guide the forward flow of the air through said air passage created with the separation seals when the compressed air supplied to the air-packing device from an air source; a 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 folding seals are formed at about the center of each air container to create the plurality of air cells in series for each air container, wherein heat-sealing between the upper and lower check valve films is prevented in a range where peeling agents of predetermined pattern are used between the upper and lower check valve films, thereby creating the common air duct, and an air input established by one of the peeling agents on the air-packing device for receiving the air from the air source.