Canning and Fish Packaging Technology

Unit 11 - Heat Sealing

11.1.1.1. Hot plate/hot bar/continuously heated hot jaw sealing
Two films to be sealed are placed between the two bars that form the jaw. Either one or both the jaws may be heated and one moves to clamp the two films together. The films now in contact melt into one another at the adjacent surfaces. The heating time may vary from 1/20th of a second to several seconds and is controlled by the time/during which the jaws remain closed.