الفهرس Only 14 pages are availabe for public view
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Abstract
Modern packaging protects food,increasing shelf live and safety.It also makes distribution possible over long distances.Its closures are made to avoid any undesired alterations after production. This includes safety seals and other devices to show any criminal poisoning of food by blackmailer.Polyethylene is a thermoplastic commodity heavily used in consumer products.Over 60 million tons of the material are produced worldw ide every year.Polyethylene is an inexpensive and versatile polymer with numerous applications.