Process for the production of a blank for containers and...

Details Process for the production of a blank for containers and... Process for the production of a blank for containers and...

B - Operations, Transporting

29

C

18/535

B29C 49/10 (2006.01)

Patent

CA 1205264

ABSTRACT OF THE DISCLOSURE There is described a process for the manufacture of a tubular pre-moulding from a thermoplastic material by providing a tube of thermoplastic material with a sub- stantially reduced material thickness in at least one zone. The tube is stretched in the axial direction, to obtain, when stretching the material, an orientation mainly in the axial direction of future pre-moulding. The material is heated in at least the oriented zone or zones to a temperature above glass transition tempera- ture (Tg) and is expanded in radial direction until it makes contact with the mould walls in order to form the mouth part with adjacent neck sections of the particular pre-moulding. The material is then cooled to a tempera- ture below glass transition temperature (Tg) and the material in one end or in both ends of the tube is heated to a temperature above the glass transition temperature (Tg) and is reshaped, in order to form the closure of the particular pre-moulding. The pre-moulding as well as the apparatus to make the same are also described. ,.,

466796

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