Plastic article or earthenware shaping or treating: apparatus – With separate and distinct upstream agitating or kneading means – Serially arranged chambers each housing a kneading or mixing...
Patent
1992-12-23
1994-02-15
Nguyen, Khanh
Plastic article or earthenware shaping or treating: apparatus
With separate and distinct upstream agitating or kneading means
Serially arranged chambers each housing a kneading or mixing...
425207, 425209, 425256, 425550, 425551, 425557, 425580, 425586, B29B 782, B29C 4518, B29C 4574, B29C 4780
Patent
active
052861872
ABSTRACT:
A machine for molding a starting crystalline saturated polyester resin such as polyethylene terephthalate includes a device for first drying and then preheating the starting resin 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. A feed section is provided for quantitatively feeding the molten starting resin to the main body of the molding machine. Accordingly, the starting resin 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. 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 using this molding apparatus 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 Co., Ltd.
Nguyen Khanh
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