B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/719, 18/785
B29C 49/60 (2006.01) B29C 47/22 (2006.01) B29C 49/02 (2006.01) B29C 49/42 (2006.01)
Patent
CA 1070074
ABSTRACT OF THE DISCLOSURE The present invention provides a method of producing a hollow article which has a mouthpiece, contours and/or changes of wall thickness from organic thermoplastic material, said method comprising extruding the thermoplastic material in a plastic state from a tubular die towards a draw-off device, the draw-off device being moved away from the tubular die accompanied by continued extrusion of plastic to produce a tubular preform which is then inflated inside a wall form defining the hollow article wall, the wall thickness of the preform depending inter alia on three para- meters, namely: (1) the amount of plastic extruded per unit time from the tubular die; (2) the cross-section of the tubular die, and (3) the draw-off speed of the draw-off device moving away from the tubular die whereby a simultaneous change of any two of the factors determining the wall thickness of the preform during production thereof takes place in accordance with the desired contours or changes of wall thickness of the tube blank, each of said two factors subject to change being one of the aforesaid three parameters.
228023
Linss Gerhard
Ossberger Karl
Firma Ossberger-Turbinenfabrik
Na
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