Cast stretch film also called cast film or cast wrap is produced by using cast extrusion process. Few unique characteristics of cast stretch film are
- Excellent Optics
- High quality tear resistance
- Consistent film thickness
Cast process is almost same as blow process. Resin beds are pumped into barrel which is heated and this raw material is forced through a die. The die is having a horizontal opening which eventually gives out sheet of film which is passed through a rolling drum which is cool and an external air is blown on the drum. This film is then stretched to the winding rod.
This method is fast and cost effective compared to blow process and more productive in terms of production quantity.