Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1979-09-24
1981-08-04
Pavelko, Thomas P.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
264 401, 425159, B29F 106
Patent
active
042821762
ABSTRACT:
An injection molding machine having a ram for injecting a settable material into an associated mold includes a hydraulic actuator formed by a piston and cylinder assembly which displaces the ram during the injection operation. The piston is an unbalanced area piston which permits the ram to be displaced in both a regenerative and a nonregenerative feed mode. Fluid controls for operating the piston and cylinder assembly include a regeneration valve in fluid communication through the cylinder with opposite sides of the unbalanced piston to permit regenerative feed of the piston and ram in one valve position or to permit nonregenerative feed in another valve position. Displacing the ram in the regenerative or nonregenerative modes of operation allows the mold to be filled at different rates or pressures.
REFERENCES:
patent: 3001233 (1961-09-01), Ernst
patent: 3741700 (1973-06-01), Hutchinson
patent: 4040776 (1977-08-01), Kelz
Package Machinery Company
Pavelko Thomas P.
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