Extrusion die mask

Details Extrusion die mask Extrusion die mask

1974-12-13

1976-03-30

Annear, R. Spencer

Plastic article or earthenware shaping or treating: apparatus

Means providing a shaping orifice

Core, pin or insert member

425380, B29F 304

Patent

active

039472140

ABSTRACT:
A mask or face plate, having an orifice or opening formed therethrough of desired size and configuration, is positioned against the discharge face of an extrusion die. The mask restricts the flow of extrudable material through the die so that such material will conform to the size and configuration of the opening or orifice formed through the mask. A recess formed in the face of the mask adjacent the discharge face of the extrusion die, surrounds the orifice formed therethrough, and communicates with said orifice by means of a gap formed in the inlet face of the mask between said recess and said orifice. The recessed or scalloped mask has particular utility when utilized with an extrusion die for forming cellular or honeycomb structures, in that the predetermined gap meters a controlled flow of additional batch material from the recess to the outer boundaries of the extruded honeycomb article passing through the orifice in said mask to encapsulate the honeycomb structure with a smooth uniform skin having improved isostatic crushing strength.

REFERENCES:
patent: 3090995 (1963-05-01), Amsden
patent: 3188689 (1965-06-01), Breen
patent: 3836302 (1974-09-01), Kaukeinen

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