Air sac with air leakage prevention self-locking one-way valves

Abstract

The invention relates to an air sac with air leakage prevention self-locking one-way valves. The air sac comprises an air sac body and the one-way valves, wherein the air sac body is formed by a rectangular first film layer, a rectangular second film layer, a rectangular third film layer and a rectangular fourth film layer in turn from top to bottom through heat sealing; a second one-way valve which is arranged in a first cavity formed by the second film layer and the third film layer, and a first one-way valve on a fifth heat sealing line are used for inflating the air sac; meanwhile, the second film layer and the third film layer which are provided with the one-way valves are integrally covered and inflated by the first film layer and the fourth film layer, and the one-way valves which are arranged between the second film layer and the third film layer are pressed through air pressure in the first film layer and the fourth film layer, so that the one-way valves are prevented from leaking air after the second film layer and the third film layer are inflated. The air sac has a simple and reasonable structure and good sealing effect; and the air tightness of the air sac can be effectively improved, the effective utilization time of the inflated air sac is prolonged, the defect that the one-way valves of the conventional air sac have poor air tightness is overcome, and the air sac is suitable for industrial manufacturing.

Description

technical field [0001] The invention relates to an air bag, in particular to an air bag with an anti-leakage self-locking one-way valve. Background technique [0002] The airbags manufactured by utilizing the high-density and airtight characteristics of plastic films such as co-extruded or casted films are usually heat-bonded with high-strength co-extruded or casted films with high-temperature resistant ink on one side of the single-piece tongue. And form a one-way valve to realize the sealing of the gas in the airbag and the outside world. This kind of one-way valve only needs to heat seal the tongue, high temperature resistant ink and co-extruded film or cast film once. The sealing mechanism is to use one side of the tongue. It is thermally sealed with one of the two co-extruded films or the cast film of the thermally synthesized airbag, and the other side of the tongue is coated with the other of the two co-extruded films or the cast film of the thermally synthesized airb...

AI Technical Summary

Problems solved by technology

The one-way valve with this structure has the advantages of simple structure and convenient processing and manufacturing. As a short-term seal, the effect is indeed better; but due to the defects in its structure, the airbag cannot fully ensure that the tongue and the co-extruded film or The inner surface of the cast film is fully pressed, especially when the airbag is squeezed by the outside world, gaps or wrinkles are easily generated between the vinyl sheet and the inner surface of the co-extruded film or cast film, resulting in a decrease in its sealing performance and affecting the airbag. normal use

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