Canning and Fish Packaging Technology

Unit 10 - Manufacture of plastic packages

10.1.2.2.Solvent casting
Solvent casting is now used to make only specialized films. In this method polymer resin is mixed together with plasticizer and other additive and then dissolved in a solvent or combination of solvents. The solution is then cast on to a smooth, moving endless metal belt. The cast solution is heated to vaporize the volatile solvent leaving the plastic as a continuous film, which is stripped away from metal belt. Even though most the solvents are recovered, the process is expensive.