By T. R. Crompton
Plastics are actually getting used on a wide scale for the packaging of fatty and aqueous foodstuffs and drinks, either alcoholic and non-alcoholic. hence it truly is most probably that a few move of polymer ingredients will happen - adventitious impurities reminiscent of monomers, oligomers, catalyst remnants and residual polymerisation solvents and coffee molecular weight polymer fractions - from the plastic into the packaged fabric with the ensuing threat of a poisonous probability to the shopper. This publication covers all elements of the migration of additions into meals and provides specified details at the analytical choice of the ingredients in a number of plastics. This e-book might be of curiosity to these engaged within the implementation of packaging laws, together with administration, analytical chemists and the brands of meals, drinks, prescribed drugs and cosmetics and in addition clinical and toxicologists within the packaging undefined. --------------------------------------------------------------------------------
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Extra info for Additive Migration from Plastics into Food; A Guide for Analytical Chemists
It is also used in the fabrication of domestic food mixers. A modified form of PPO is available with the trade name Noryl (General Electric Company). This is cheaper than PPO and has excellent mechanical properties over the range –40 to 120 °C. This polymer is used extensively in food contact applications where an impact strength slightly inferior to that of PPO is acceptable. 17 Polysulfone This is another engineering plastic used in food engineering. It is a tough rigid transparent plastic with very high tensile strength, creep resistance and low mould shrinkage and water absorption.
The increase in impact strength and flexibility thus acquired is accompanied by some loss in clarity, so that only opaque or translucent grades of toughened polystyrene are available. This does not however, limit its uses in food packaging. Polystyrene is also available in an expanded (cellular) form and as such is used extensively in the fabrication of vending machine drinking cups. Polystyrene is used extensively in food packaging and in the home. The toughened polymer is injection moulded into tubs and containers for yogurt, dairy cream, cut peel, ice cream, cottage cheese, honey and syrup.
Variants which are in regular production include the following types: nitrocellulose coated on both sides (moisture-proof), heat sealable, non moisture-proof, nitrocellulose coated on one side only and copolymer coated on both sides. Regenerated cellulose film has a light transmission equal to that of glass. Dry cellulose film is practically impermeable to the permanent gases but becomes permeable when wet. Moisture vapour permeability is very high unless the film is coated. 24 Types of Polymers Used in Commodity Packaging Both moisture-proof and non-moistureproof film have a wide variety of uses including important applications in the food packaging field.
Additive Migration from Plastics into Food; A Guide for Analytical Chemists by T. R. Crompton