Canning and Fish Packaging Technology

Unit 9 - Plastics for Packaging

9.3.8.Regenerated cellulose film
Cellulose is obtained from wood pulp or cotton linters. It is soaked in caustic soda for about an hour and the recess alkali is pressed out. Residue is pressed and allowed to age for 2-3 days during which time it absorbs oxygen from air and reduces the chain length of cellulose. It is dissolved in carbon disulphide solution and then dispersed in dilute alkali.