Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1989-12-19
1991-07-23
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
26432814, 26432817, 264349, 264537, 264532, 264DIG65, B29B 1302, B29C 3502, B29C 4906
Patent
active
050341774
ABSTRACT:
A crystalline saturated polyester resin such as polyethylene terephthalate, is molded into a desired shape in a molding machine under conditions such that the crystallization temperature of the resulting molded article is within 20.degree. C. of the crystallization temperature of the starting saturated crystalline polyester resin. This is accomplished by preheating the resin in the molding apparatus to a temperature above its melting point to lower the viscosity of the resin to such an extent that the resin is not substantially degraded in the compression section of the molding machine. By avoiding reductions in the crystallization temperature of the molded resin, the resin can be shaped by, for example, blow molding into a bottle or other configuration while satisfying simultaneously the requirements for transparency and dimensional stability. The molded polyester articles obtained from the present invention are substantially free from chalking and variation in internal volume and are excellent in heat resistance.
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Niimi Hiroji
Satake Takashi
Tomita Kunio
Mitsui Petrochemical Industries Ltd.
Silbaugh Jan H.
Timm Catherine
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