Air bag packaging arrangement and self-adhesive checking valve thereof

A method of producing an air bag packaging arrangement, comprising the steps of:

• (a) providing an air cushioning layer comprising a group of independent and parallel air cushioning cells;
• (b) providing an air channel communicated with each of said air cushioning cells for inflating air therein;
• (c) folding said air cushioning cells to provide a receiving chamber for storing items;
• (d) providing a group of self-adhesive checking films each comprising a first valve film, a second valve film, and a third valve film positioned between said first valve film and said second valve film;
• (e) forming an air inflating channel between said first valve film and said second valve film;
• (f) forming a backflow prevention channel between said second valve film and said third valve film in such a manner that when said air receiving cavity is filled with said air through said air inflating channel, inner surfaces of said first valve film said second valve film, and said third valve film are attached with each other to prevent said air to flow back through said air inflating channel, wherein in case of leakage, said air is selectively guided into said backflow prevention channel to create a supplemental air pressure to apply on said second valve film to further seal and close said air inflating channel so as to prevent air leakage;
• (g) providing a first blocking layer between said first valve film and said second valve film, so that when said self-adhesive checking valve undergoes a heat sealing process, said first valve film and said second valve film are not completely sealed with each other in such a manner that said air inflating channel is formed therebetween, and
• (h) providing a second blocking layer between said second valve film and said third valve film, wherein a length of said second blocking layer is smaller than a length of said second valve film, so that end portions of said second blocking layer are not aligned in an end-to-end manner with said second valve film and said third valve film at an inflating side, wherein said second valve film and said third valve film at said inflating side are completely sealed with each other.