Blow molding machine with accumulator cushion regulation

Details Blow molding machine with accumulator cushion regulation Blow molding machine with accumulator cushion regulation

1989-03-20

1990-11-20

Housel, James C.

Plastic article or earthenware shaping or treating: apparatus

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

Feed control of material en route to shaping area

264 407, 264541, 425140, 425145, 425150, 425161, 425166, 425381, 425532, B29C 4904

Patent

active

049715429

ABSTRACT:
The invention relates to a blow molding machine for the blow molding of hollow articles, with an accumulator head (1) for producing a preform and with a blow mold for forming a hollow article from the preform. After completion of a blow molding sequence, a piston positioning signal is derived by a control system (15), to regulate the position of a discharge piston (4) in the accumulator head (1), from a comparative signal of the actual position and set position of the discharge piston (4). The set position is determined by integration from a previously specified speed set point profile. The control system (15) further superimposes an influx signal on the comparative signal, which corresponds to the change in volume of plastic flowing from an extruder (2) to replace the discharged contents of the accumulator head (1). The deviation between an actual cushion and a set point cushion for the plastic remaining in the accumulator head at the end of the discharge step is reduced by regulating the rotational speed of the extruder.

REFERENCES:
patent: 3759648 (1973-09-01), Hunkar
patent: 3767339 (1973-10-01), Hunkar
patent: 3865528 (1975-02-01), Roess
patent: 4179251 (1979-12-01), Hess et al.
patent: 4338071 (1982-07-01), Daubenbuchel et al.
patent: 4594065 (1986-06-01), Langlois et al.
patent: 4678420 (1987-07-01), Inoue

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