Plastics are everywhere – in food containers and toys, in cosmetics packaging and household utensils. While some plastics are eco-friendly and may be safe for kids, others contain harmful chemicals or cause dangerous pollution during manufacturing.
Polyethylene terephthalate (PET or PETE); a strong, stiff synthetic fibre and resin, and a member of the polyester family of polymers. PET is spun into fibres for permanent-press fabrics, blow-molded into disposable beverage bottles, and extruded into photographic film and magnetic recording tape.
Pasteurization heat-treatment process that destroys pathogenic microorganisms in certain foods and beverages. It is named for the French scientist Louis Pasteur, who in the 1860s demonstrated that abnormal fermentation of wine and beer could be prevented by heating the beverages to about 57° C (135° F) for a few minutes.
In recent years, PET (polyethylene terephthalate) has been the packaging material of choice for water and soft drinks. Plastic bottles are increasingly being used for beer, juices, sports drinks, and aromatized alcoholic drinks. But each product requires specific qualities in its bottles.
The process of forming plastics into various shapes typically involves the steps of melting, shaping, and solidifying. As an example, polyethylene pellets can be heated above Tm, placed in a mold under pressure, and cooled to below Tm in order to make the final product dimensionally stable.
Light, versatile synthetic resin made from the polymerization of ethylene. Polyethylene is a member of the important family of polyolefin resins. It is the most widely used plastic in the world, being made into products ranging from clear food wrap and shopping bags to detergent bottles and automobile fuel tanks. It can also be slit or spun into synthetic fibres or modified to take on the elastic properties of a rubber.
Food packaging as a vital part of the subject of food technology is involved with protection and preservation of all types of foods. Food packaging is becoming increasingly important in thefood industry, where advances in functionality such as con-venience and portioning are gaining more attention.