Method for controlling parison wall thickness and a wall thickne

Details Method for controlling parison wall thickness and a wall thickne Method for controlling parison wall thickness and a wall thickne

1977-07-14

1980-09-23

Rubinson, Gene Z.

Electricity: motive power systems

Positional servo systems

Digital or numerical systems

318573, 425162, 425451, 264 405, G05B 1929

Patent

active

042245605

ABSTRACT:
The present invention discloses an arrangement wherein a wall thickness of a plastic bottle formed by means of a blow-molding process is formed into the desired configuration by controlling the wall thickness of a parison from which the bottle is made. A control pin arranged opposite an extrusion outlet of an extruding machine for adjusting the wall thickness of the parison is finely moved in response to a fine step-like control voltage signal to thereby suitably set and vary the opening degree of the extrusion outlet of the extruding machine, thus obtaining the desired wall thickness for the parison.

REFERENCES:
patent: 3410177 (1968-11-01), Roess et al.
patent: 3936713 (1976-02-01), Hunkar
"Is Precision Parison Programming the Answer to Blow-Molders' Dreams?", Plastics World, Jun. 1970, pp. 58-61.
"Parison Programmer Traces New Profit Profile for Blow-Molders", Plastics World, Apr., 1971, pp. 46-49.

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