The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 08, 2004
Filed:
May. 15, 2001
Tadahiro Kannari, Ichihara, JP;
Idemitsu Petrochemical Co., Ltd., Tokyo, JP;
Abstract
The invention relates to a method for producing blow moldings, especially to a blow-molding method capable of efficiently producing blow moldings of crystalline thermoplastic resin having good surface gloss and good mold transferability of, for example, embossed patterns and, not warped, having a good appearance with no sinkmarks. The method comprises blowing and shaping a parison of a crystalline thermoplastic resin at a mold temperature falling between (the crystallization point of the resin −10° C.) and (the melting point of the resin), then keeping the thus-blown parison at a temperature falling between (the crystallization point of the resin −15° C.) and (the crystallization point thereof −45° C.) for a dwell time of from 30 to 300 seconds, and thereafter cooling it in an ordinary manner.