Method of controlling the position of an extruded preform in a b

Details Method of controlling the position of an extruded preform in a b Method of controlling the position of an extruded preform in a b

1991-05-15

1992-04-07

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Measuring a weight or volume

264 402, 264 405, 264 407, 264541, 425140, 425148, B29C 4904, B29C 4978

Patent

active

051025884

ABSTRACT:
A method of making tubular bodies from thermoplastic material by extruding a parison through an extruder head die slit which is then expanded in a blow mold. The position of the parison and particularly a thickened portion thereof is regulated and/or controlled relative to critical cross-sectional regions of the hollow body blown therefrom. The hollow body of the separated lower waste portions and/or the net weight of the hollow body is measured in order to control and/or regulate the position of the thickened portion of the parison and to change the die slit as need be upon deviation from a reference value. The latter is particularly beneficial in accumulation head operation, while in continuous operation, either the hollow body net weight and the weight of the lower waste-portion is measured and compared with a reference characteristic or the hollow body net weight is compared to a reference characteristic and markings reflective of the critical cross-sectional regions of the blown article are sensed.

REFERENCES:
patent: 3629382 (1971-12-01), Fogelberg et al.
patent: 3795719 (1974-03-01), Morecroft et al.
patent: 4179251 (1979-12-01), Hess et al.
patent: 4338071 (1982-07-01), Daubenbuchel et al.
patent: 4474716 (1984-10-01), Daubenbuchel et al.
patent: 4869862 (1989-09-01), Bryan

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