| Abstract: | Manufacture and Use of Hollow Elements Made of Plastics I Packaging belongs to the basic requirements of human beings today. With regard to its function, manufacture, and material, packaging has so far developed to such an extent that it can be considered as an index for the standard of living. Currently, plastic constitute 20% of all packaging material. Approximately one-fifth of this are blown hollow elements including fasteners. Blowing processes permit manufacture of mini-packages up to large storage tanks, which are all made from the same material, polyethylene. Extrusion blowing is the process most commonly used, and 80% of all blown hollow elements are made out of polyethylene. Polyethylene as packaging material is used in all those cases where the degree of transparency, rigidity, and water vapour impermeability must be high, and the costs must be limited. Currently, blown hollow elements made of polyethylene are widely used in following fields both for mass packaging as well as special packaging: foods including edible oils and fat products, cleansing agents, cosmetics, adhesives, mineral oils, pharmaceutica etc. |
