B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/535
B29C 49/10 (2006.01)
Patent
CA 1210915
ABSTRACT OF THE DISCLOSURE There is described an apparatus for the manufacture of a tubular pre-moulding from a thermo- plastic material. The apparatus can axially stretch a tube of the thermoplastic material to a substan- tially reduced material thickness in at least a cen- tral zone of the tube while substantially maintaining the diameter of the tube in the axially stretched section in the central zone. The reduction is by a factor sufficient to cause yielding and orienting of the material substantially in the axial direction of the future pre-moulding. The apparatus can also effect the axial stretching of the tube at a temperature not greater than the glass transition temperature of the thermoplastic material. A mould surrounds the tube, and the material is heated in one of the oriented zones to a temperature above the glass transition temperature. The material is expanded in the radial direction of the tube until it makes contact with the mould to form a mouth part with adjacent neck section of the pre-moulding, the material then being cooled to a temperature below the glass transition tempera- ture, thereafter heated at one end of the tube to a temperature above the glass transition temperature and formed as a closure at the one end for the pre- moulding.
487316
Jakobsen Kjell M.
Nilsson Claes T.
Ogilvy Renault
Plm Ab
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