Plastic injection molding process

Details Plastic injection molding process Plastic injection molding process

2011-06-14

2011-06-14

Heitbrink, Jill L (Department: 1743)

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

Reexamination Certificate

active

07959844

ABSTRACT:
Plastic containers are injection molded of HDPE blow molding grade resin having a density of about 0.960 to 0.965 g/cc and a melt index of about 0.7 to 1.0 g/10 min. at injection temperatures of 570° F. to 670° F. and mold cavity pressures of 20,000 psig to 27,000 psig. Relatively thin walled, rigid, livestock feed containers can be manufactured using about 20% to 50% less material while retaining strength and durability comparable to containers molded of HDPE injection molding grade resins.

REFERENCES:
patent: 5589128 (1996-12-01), Lai et al.
patent: 6746560 (2004-06-01), Humphrey et al.
patent: 2006/0165930 (2006-07-01), Easterday et al.
patent: 1357136 (2003-10-01), None

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