| 摘要 |
<p>Packaging bag is made of >=2 plies and has an easily openable closure seam. It comprises an inner ply of paper which has been rendered sealable by addn. to the paper pulp, of sealable plastics; and an outer ply of sealable plastics. Both plies are bonded together by seal seams. The closure seam is formed between the inner ply of the walls of the bag, and the outer seams of the bag are formed between the edges of the outer ply protruding beyond the inner ply. The closure seam is easily opened without risk of damage to the walls of the bag. The other seams have good resistance to streasses, during prolonged or repeated use, by folding, flexing, compressing or pulling.</p> |
