信函装入信封，为保密、安全、勿失，要将信封封口封住，其封口方式随时代的发展也与时俱进，方式各异，现代社会多用胶水、浆糊、胶带纸等等。世界各国和我国邮政为对邮寄者高度负责，印制了多种特别为弥补破损封（袋）的封口纸，并印有文字说明
一种礼花筒，包括有一花筒，该花筒的上端封有一封口纸；
The utility model relates to a fireworks display tube, comprising a firework tube. The upper end of the firework tube is sealed with a sealing paper.
片剂、胶囊数粒瓶装包装线具有自动理瓶、计量灌装、塞纸、旋盖、铝箔封口、贴标、打码及装盒等功能。
The packaging assembling line can automatically unscramble bottle, count and fill medicine, insert paper, screw cap, induction foil seal, label, print code and cartoner.
封口材料中聚乙烯膜和塑料瓶盖两个处理玻璃化率相似且玻璃化率高，硫酸纸次之，棉塞的最低。
The vitrification rate caused by cotton plug wrapped in cheese cloth was the lowest among all seal materials, including polyethylene film, plastic cover and sulfuric paper.
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