Blow molding machine with accumulator waiting time control

Details Blow molding machine with accumulator waiting time control Blow molding machine with accumulator waiting time control

1989-03-21

1990-09-25

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

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

Patent

active

049590014

ABSTRACT:
A blow molding machine for the blow molding of hollow articles includes an accumulator head (1) for producing a preform and a blow mold for forming a hollow article from the preform. After completion of a blow molding sequence and the filling of the accumulator head (1), a piston positioning signal is sent by a control system (15) to regulate the position of a discharge piston (4) in the accumulator head (1) derived 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 control system (15) uses the influx signal value determined at the end of a discharge stroke for correcting the set point values for the initial position and the final position for the next discharge stroke. The waiting time between completion of the blow molding sequence and reaching the set point contents level and vice versa is reduced by the control system (15) by controlling the rotational speed of the extruder (2).

REFERENCES:
patent: 3865528 (1975-02-01), Roess
patent: 4338071 (1982-07-01), Daubenbuchel et al.
patent: 4678420 (1987-07-01), Inoue

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