简介丙纶邮政袋的生产工艺及技术关键，叙述丙纶邮政袋替代纯棉帆布邮政袋的优势。
The producing process and technical key of polyethylene postal bag are introduced and the advantage of polyethylene postal bag in place of pure cotton canvas postal bag is described.
众所周知，井下作业人员工作服多以纯棉细帆布为主。
As everyone knows, underground work personnel's work clothes take cotton thin canvas as the core more.
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