| 摘要 |
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. The face of the mask adjacent the discharge face of the extrusion die is provided with an offset or stepped portion which surrounds the orifice formed through the mask and extends radially outwardly therefrom in a plane extending perpendicular to the axis or direction of extrusion. Preferably the offset planar face is radiused at its juncture with the orifice. The offset or stepped mask has particular utility when utilized with an extrusion die for forming cellular or honeycomb structures, in that the gap formed by the predetermined offset meters a controlled flow of additional batch material from the offset portion 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 with improved selections.
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