Polyethylene terephthalate (PET) is a type of polyester formed from terephthalic acid and ethane-1,2-diol. PET is a hard, semi-crystalline and transparent plastic with excellent tensile strength, chemical resistance and light weight, making it suitable for rigid food packaging applications like bottles and containers. While PET has advantages like toughness and recyclability, it also has disadvantages such as susceptibility to acid and base attacks and low thermal and solvent resistance. PET is commonly used for packaging carbonated beverages, baked goods, frozen foods, tea, coffee and spices.

1. FPE 451 - FOOD PACKAGING TECHNOLOGY (2+1)
COMPILED BY-
ANUJ JHA
2014027007
POLYESTER [PE]

2. • Formed from dicarboxylic acid and a diol
• Made from an acid, benzene-1,4-dicarboxylic acid (terephthalic acid)
and an alcohol, ethane-1,2-diol
• Known from its trivial name polyethylene terephthalate (PET)
INTRODUCTION:-
General Polyester Formula

3. • Polyester as PET is a hard, semi-crystalline and transparent, excellent
tensile strength, chemical resistance and light weight choice for rigid
packaging also good for molding and extrusion
• As elastomers used to generate elasticity and elastic food packaging
materials
• As polycarbonates they become non- crystalline, with high optical
clarity and toughness
Properties:-

4. ADVANTAGES:-
1. Tough and rigid
2. Processed by thermoplastic operations
3. Are recyclable and improved reusing abilities
4. Has low moisture absorption

5. DISADVANTAGES:-
• Subject to attack by acid and bases
• Low thermal resistance
• Poor solvent resistance

6. Applications in food processing industry
• Films are used for transparent pack of food for gift items
• PET bottles are used for carbonated beverages and other drinks
• Used in the form of baked good packaging and take-out containers

7. Types of Polyester [PE] Applications
Bare PE film Sweet wrappers
Metalized PE film (Coloured) Frozen foods-processed or cooked
Metalized PE laminate Packet for tea, coffee and spices
PE foil Freeze-dried foods
PE film with heat lacquer coating Biscuit wrappers