密封钳有两种类型：

脉冲密封钳（通常是单层膜）
当无障碍和无针孔的体育七星彩开奖结果不是很关键时使用。将平纹或表面印刷的单（单层）膜在纵向上从内层密封到外层，以形成“overlap”密封。端部密封件用“impulse” seal consisting of a heated wire covered with Teflon tape. Everyday examples include baby carrots, dry beans and cranberries.   Rice is a lanination of LDPE  / LDPE and runs on 冲动 jaws.

电阻密封钳口（层压多层膜或coex）
使“fin”密封时，具有不同熔点的2层结构的内表面以镜像方式密封在一起。外层的熔点比内层高“sealant”层。恒温裸金属“resistance” end seal jaws penetrate the inner layer flow and caulk without distorting the outer layer which has higher heat 抵抗性. A ubiquitous example is cereal box liner bag. 

In either style, performance of the 密封胶 layer is critical.