信封是人们用于邮递信件、保守信件内容的一种交流文件信息的袋状装置。信封一般做成长方形的纸袋。
Envelopes are used for Posting letters, conservative content of mail a device communication file information of bag. Made of rectangular envelope paper bag.
用纸：一般采用80g-150g的双胶纸、牛皮纸（本色牛皮纸、白色牛皮纸），根据不同的功用，也有用艺术纸、铜版纸等等。
Paper: general use 80 g - 150 - g ShuangJiaoZhi, kraft paper (unbleached kraft paper, white kraft paper), according to the different function, useful also art paper, coated paper and so on.
国内标准信封规格有(正面的长×宽):
Specification: domestic standard envelope (length x width of positive) specification:
标准信封规格名称成品尺寸:
International standard specification name envelope finished product size:
