Temperature conditioning

Details Temperature conditioning Temperature conditioning

1992-06-16

1994-08-23

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Stretching or stretch forming

264521, 264532, 264535, 264DIG65, 264DIG73, 425384, 425393, 425394, 425417, 425526, 425529, 425534, 425DIG39, 432224, 432225, B29C 3502, B29C 5522, B29C 4964

Patent

active

053405269

ABSTRACT:
A method for temperature conditioning a blank of plastic material in which a conditioning mandrel is placed within the blank and thereafter expanded into reliable abutment against the inner surface of the blank. The mandrel is thereafter returned to its initial position. The outer surface of the mandrel is adjusted to and maintained at a certain temperature, whereby, during the abutment, an energy exchange takes place between the blank and the mandrel for adjusting the temperature of the blank. At high temperatures of the mandrel, the mandrel is displaced out of the blank after such short time that the plastic material in the region of the abutment surface never passes the critical temperature of tackiness of the plastic material and/or thermal crystallization of the plastic material. As a rule, the expansion and contraction of the mandrel is repeated one or more times.

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