Canning and Fish Packaging Technology

Unit 10 - Manufacture of plastic packages

10.1.2.3.Calendaring
Certain plastic resins, especially PVC are made into thicker sheets rather than thin gauges by hot calendaring. The resin is processed on a calendar stack that usually has be polished, heated large rolls typically assembled in an L shape. The rolls are rigidly mounted and can be adjusted to have precisely metered gaps. Softened plastic is forced between the gaps or nips between the adjacent rotating rolls. This process converts the plastic into a continuous sheet that is hauled off and wound up.