Swept leg spider for an extrusion apparatus
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United States of America Patent
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Dec 18, 2012
Grant Date -
May 17, 2012
app pub date -
Dec 15, 2011
filing date -
Dec 21, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A spider for an extrusion apparatus located upstream from a die, through which a profile is extruded. The spider can have an outer housing with a central flow passage therethrough. An inner hub can be positioned within the central passage for supporting an inner portion of the die. At least one spider leg can be secured to the outer housing and the inner hub, and support the inner hub within the central passage. The at least one spider leg can recess radially rearwardly outwardly in the downstream direction such that molten polymer flowing through the central passage flows around the at least one spider leg, separating and rejoining together earlier in inner radial regions close to the inner hub than in outer radial regions close to the outer housing for reducing spider lines on inside surfaces of extruded profiles.
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