Plastic and nonmetallic article shaping or treating: processes – Recycling of reclaimed or purified process material – Of gaseous process material
Patent
1996-12-24
1998-07-07
Theisen, Mary Lynn
Plastic and nonmetallic article shaping or treating: processes
Recycling of reclaimed or purified process material
Of gaseous process material
26433111, 264DIG69, B29C 6700
Patent
active
057763860
ABSTRACT:
A molded cross-linked polyethylene article is formed using cross-linked polyethylene scrap generated in a previous extrusion process. The scrap is used, either by itself or mixed with essentially virgin cross-linkable polyethylene and a master batch mixture, to define a partially cross-linked moldable plastic material having a gel percent higher than that of the essentially virgin polyethylene used in the extrusion process. The mold used to form the scrap-based polyethylene end product has, for the essentially virgin polyethylene, a maximum acceptable plastic inflow rate. However, when the same mold is used to form the scrap-based polyethylene article, the molding problems previously associated with attempts to use polyethylene scrap in a heat-based cross-linked plastic formation process are advantageously eliminated by reducing the plastic mold inflow rate to a rate not greater than a second inflow rate less than the maximum virgin polyethylene flow rate and inversely related to the ratio of the gel percent of the scrap-based polyethylene used in the molding process to the gel percentage of the essentially virgin polyethylene.
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Bracken Catherine E.
Konneker J. Richard
Smith Marlin R.
Theisen Mary Lynn
United States Brass Corporation
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