Title:
【発明の名称】プリフォームの温度調節
Document Type and Number:
Japanese Patent JPH04500338
Kind Code:
A
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.
Inventors:
Niltsorn, Tossten
Application Number:
JP51153089A
Publication Date:
January 23, 1992
Filing Date:
November 14, 1989
Export Citation:
Assignee:
PALM AB
International Classes:
B29C35/02; B29B13/02; B29C49/64; B29C51/42; B29C55/30; B29C; (IPC1-7): B29C35/02; B29C51/42; B29C55/30
Attorney, Agent or Firm:
Yoshio Kawaguchi (4 outside)