Injection-molding machine for synthetic plastic material

Details Injection-molding machine for synthetic plastic material Injection-molding machine for synthetic plastic material

1976-03-08

1978-10-17

Husar, Francis S.

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

425149, B29F 106

Patent

active

041206312

ABSTRACT:
The injection-molding machine is operative when activated for performing a complete injection-molding cycle. The machine includes a mold defining a mold cavity, a plastifying and injecting screw, and an hydraulic cylinder-and-piston unit for driving the screw. During the course of a single injection-molding cycle, negative-feedback control of the pressure in the mold cavity undergoes an automatic transition into negative-feedback control of the pressure in the hydraulic cylinder of the cylinder-and-piston unit. The transition is selected to be abrupt or gradual, and if gradual there will be a transitional interval during which a composite negative-feedback control of both the mold cavity and hydraulic cylinder pressures is occurring.

REFERENCES:
patent: 3767339 (1973-10-01), Hunkar
patent: 3822057 (1974-07-01), Wheeler
patent: 3840312 (1974-10-01), Paulson et al.
patent: 3893792 (1975-07-01), Laczko
patent: 3932083 (1976-01-01), Boettner
patent: 3941534 (1976-03-01), Hunkar

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