Method improvements for controlling parison length

Details Method improvements for controlling parison length Method improvements for controlling parison length

1974-08-08

1976-03-09

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 99, 425140, 425150, 425DIG231, B29C 1707

Patent

active

039432149

ABSTRACT:
Method for controlling the length of parison portions available for blow molding which includes use of a carrier supporting a plurality of blow molds, a drive train for the carrier to consecutively position such molds beneath an extruder head and a logic module responsive to a control signal for regulating the length of parison portions protruding beyond the cavity of successively presented molds, the improvement which includes use of variable speed means responsive to such signal for changing the speed of movement of the carrier to vary the rate at which consecutive molds are presented to the head. The method involves varying the speed of movement of the carrier in response to such signal to thereby vary the rate at which molds are presented for receiving consecutive parison portions, and therefore the amount of the length of each such parison portion available to protrude beyond the cavity of a mold.

REFERENCES:
patent: 2750624 (1956-06-01), Coates et al.
patent: 2854691 (1958-10-01), Strong
patent: 2928120 (1960-03-01), Leghorn et al.
patent: 2952034 (1960-09-01), Fortner
patent: 3002615 (1961-10-01), Lemelson
patent: 3759648 (1973-09-01), Hunkar
patent: 3795719 (1974-03-01), Morecroft et al.

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