Extrusion die with supply groove transfer

Details Extrusion die with supply groove transfer Extrusion die with supply groove transfer

2005-03-15

2005-03-15

Del Sole, Joseph S (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

Stock pressurizing means operably associated with downstream...

Including auxiliary shaping means associated with molding...

C425S462000, C425S467000

Reexamination Certificate

active

06866498

ABSTRACT:
An extrusion die for extruding plastic material as a tubular film has mututally engaging first and second body members which form an annular extrusion orifice therebetween. One of the body members has main feed grooves in a surface thereof adjacent the other body member and extending in a spiral manner relative to the annular extrusion orifice, and one of the body members has supply grooves in a surface thereof adjacent the other body member for receiving plastic material from one or more extruders. Each supply groove has an end portion adjacent but spaced from an initial portion of a main feed groove, whereby plastic material from the extruder or extruders is received by the supply grooves and forced from the end portions thereof along a passage between the body members and into the initial portions of the spiral feed grooves.

REFERENCES:
patent: 5393216 (1995-02-01), Teutsch et al.
patent: 5651935 (1997-07-01), Matsukura et al.
patent: 5716650 (1998-02-01), Mavridis

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