| 摘要 |
PURPOSE: A nonlinear air stop valve structure is provided to effectively block reverse flow of air in a sealed body, to outside. CONSTITUTION: Two plastic inner films(21,22) with a narrow width is installed in an air sealing body(1) which consists of two plastic outer film(11,12) with a wide width. A plurality of arc lines are formed on the inner film by heat sealing. A plurality of left arc lines(3) and a plurality of right arc lines(4) are asymmetrically arranged. Grooves are formed at the end part of the left arc lines and right arc lines. A heat resistant material(6) is spread on an air injection part, and the inner film is inserted into the outer film, to heat sealing a horizontal line of a heat sealing line. Air flows into an air inlet(23), when the sealing body charges air through an air blocking valve structure.
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