Flat-sheet injection head

Details Flat-sheet injection head Flat-sheet injection head

1975-01-27

1977-11-29

Husar, Francis S.

Plastic article or earthenware shaping or treating: apparatus

Stock pressurizing means operably associated with downstream...

425461, 425DIG235, B29C 1500

Patent

active

040603687

ABSTRACT:
An extruder of plastic material has a flat sheet injection head which extrudes directly between the opposed rolls of a calender which reduces the extruded sheet in thickness. The injection head is divided into two halves of which one is fixed to the calender frame while the other is carried by the extruder which is movable away from the calender for cleaning of the injection head. When the two halves of the injection head are in operative position pressure against one of the two halves is provided by a plurality of pressure elements acting between the half of the injection head carried by the extruder and a transverse supporting member of the calender. The pressure elements may be in the form of hydraulic cylinders, a hydraulic cushion or a plurality of wedges actuated by hydraulic cylinders or by movement of the extruder to closed position.

REFERENCES:
patent: 2771637 (1956-11-01), Silvasy et al.
patent: 3142091 (1964-07-01), Curtiss
patent: 3488807 (1970-01-01), Vossen
patent: 3824053 (1974-07-01), Straub et al.
patent: 3895898 (1975-07-01), Theysohn

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