| 摘要 |
PURPOSE: An acceptance cover equipped with lots of the exhaust pipes is provided, which makes an exhaust pipe automatically opened and maintains long time air blocking after exhaustion. CONSTITUTION: An acceptance cover(1) includes two outer films(2a,2b), two inner films(1a,1b), a traverse direction heat sealing line(12a), a receiving space(11), an exhaust zone(60), and a lot of exhaust pipes(2d). Two outer films include a first step and a middle step. Two inner films are positioned between the upper end of the outer film and the middle step. The traverse direction heat sealing line is formed by heat-sealing two outer films and two inner films. The receiving space is formed between the traverse direction heat sealing line and the first step. The exhaust zone is formed between the outer film upper end and the traverse direction heat sealing line. The exhaust pipe is formed between the inner films.
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