Method for blow molding and cooling plastic articles
OwnerLeonard Benoit Ryderinventor
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Abstract
A technique for internally cooling a blow molded article with a coolant comprising a mixture of subzero temperature dry air and water. A pressure swing dessicant bed type dryer and chiller are used to supply the dry air having a dew point of the order of -60.degree. F and a temperature ranging from -30.degree. to -50.degree. F for introduction into the blow molded article.
Claims7
A process for the preparation of a blow molded article which comprises the steps of shaping a thermoplastic polymer material in a mold cavity with a pressurized gaseous blowing medium to form a hollow shaped article and cooling the article, the improvement which comprises effecting said cooling by
- (a) introducing air having a temperature ranging from 75.degree.-105.degree. F and maintained at a pressure ranging from 80-400 psig at a dew point of about 75.degree. F to a pressure swing dessicant bed type dryer, so resulting in drying of said air to a dew point of the order of -60.degree. F,
- (b) passing the resultant dried air to a chiller wherein it is cooled to a temperature ranging from -30.degree. to -50 .degree. F, and
- (c) introducing said chilled air into and continually flushing it through the blow molded article.
Dependencies are inferred from the claim text.