Canning and Fish Packaging Technology

Unit 13 - Paper and Board

13.1.4.Coatings used in paper and carton boards
In addition to the availability of various types of papers and boards, these are given various coatings as follows,

• Clay, Calcium carbonate and binder to enhance appearance and printability.
• Fluorocarbon to enhance grease residence for contact with fat containing foods.
• Silicone: To obtain release characteristics for ovenable boards.
• Polyethylene (PE): To obtain water resistant and water vapour barrier properties and a degree of grease resistance and heat seal-ability.
• Polypropylene (PP): To get improved grease resistance and heat resistance.
• Polyethylene Terenphthalate (PET): PET coated boards are more heat resistant than PP. Therefore used for dual purpose i.e. microwave or domestic ovenable board packaging.
• Varnish applied after printing. To give high gloss or matte finish or to provide protection e.g. Resistance to deep freeze, resistance to water and minimize scuff.
• Wax: to impart water resistant quality.