Apparatus for and method of manufacturing of preforms having a l

Details Apparatus for and method of manufacturing of preforms having a l Apparatus for and method of manufacturing of preforms having a l

1992-11-20

1994-07-19

Timm, Catherine

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Mold motion or position control

425529, 425532, 425533, 264506, 264539, B29C 4904, B29C 4928, B29C 4978

Patent

active

053303423

ABSTRACT:
An apparatus for manufacturing a tube-like preform having a longitudinal wall with a variable cross-section for blow molding of a hollow body from a thermoplastic material, includes a tubular die having a variable exit opening, and a collar die having a recess and movable into engagement with and away from the tubular die, the preform being produced by ejecting of the thermoplastic material from the exit opening of the tubular die into the recess of the collar die while moving tubular die, with controlling a speed of movement of the collar die and a cross-section of the exit opening of the tubular die in such a manner that larger and smaller cross-section of the exit opening correspond to speed rate of the collar die, so that a thickness of the wall of the producible preform changes from peaks to valleys in a wave-like manner to form the variable cross-section of the wall.

REFERENCES:
patent: 3008192 (1961-11-01), Allen et al.
patent: 3019480 (1962-02-01), Soubier
patent: 3795719 (1974-03-01), Morecroft et al.
patent: 4188179 (1980-02-01), Linss et al.

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