Controlled skin formation for foamed extrudate

Details Controlled skin formation for foamed extrudate Controlled skin formation for foamed extrudate

2006-10-26

2010-11-16

Gupta, Yogendra N (Department: 1791)

Plastic article or earthenware shaping or treating: apparatus

Immersed shaping orifice discharging directly into liquid...

C425S19200R, C425S377000, C425S378100, C425S461000

Reexamination Certificate

active

07832998

ABSTRACT:
An extrusion apparatus is taught that employs a die adapter that is partially submerged in a heat transfer bath on a horizontal plane such that there is no air gap between the die extrusion aperture and the heat transfer bath. A porous dam is positioned between the die and the heat transfer bath. A heat insulating plate is positioned between the porous dam and the die to prevent the heat transfer medium from flowing onto the die. The heat insulating plate also prevents excessive cooling of the die tip thereby allowing the necessary precise thermal control over the extrudate skin formation to prevent melt fracture and form a low density extrudate with a smooth solid skin and inner foamed core.

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