Patent ID: 7757857

Claim:
A plastic bag for vacuum packing comprising a first film with a flat surface and a second film with embossments, each of said films comprising a uniform inner surface which films are joined together at least at opposite lateral sides of the films to define a chamber adapted to have an item disposed therein, and said embossments are formed on the inner surface of said second film, wherein each of said embossments consists of a group of more than one protuberance and these protuberances are arranged at intervals and are parallel to each other; the embossments are arranged at intervals separated from each other and aligned in a direction parallel with said lateral sides, the aligned embossments thereby defining a line of embossments; the embossments defining a plurality of said line of embossments, two adjacent said lines of embossments constitute a gas-exiting unit, and the said two lines of embossments are arranged parallel with each other and staggered, such that each embossment in one said line of embossments is adjacent to a gap between two adjacent embossments in the other said line of embossments; a plurality of said gas-exiting unit is arranged on the inner surface of said second film so that the whole inner surface is covered.