Method for forming large objects such as refrigerator liners fro

Details Method for forming large objects such as refrigerator liners fro Method for forming large objects such as refrigerator liners fro

1986-08-25

1989-06-27

Hruskoci, Peter

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Differential temperature conditioning

264549, 264550, B29C 4302

Patent

active

048427420

ABSTRACT:
A method of forming relatively large objects, such as refrigerator liners, by a solid phase forming process from crystalline-type synthetic resins, such as polypropylene. The invention comprehends utilization of stretch forming, vacuum forming, and pressure forming techniques in combination with controlled heating of different portions of the billet to provide desired differential thicknesses in different portions of the liner. The invention further comprehends the provision of the liner with biaxial molecular orientation in portions thereof subject to shock impact forces.

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Solid Phase Forming of Thermoplastics, by Herbert Johnson, David Roylance and Richard Desper, pp. 371-380, of proceedings of 4th National Sampe Technical Conference & Exhibition, Oct. 17-19, 1972.
"Solid Phase Stretch Forming" (SPSF), publ'd by Shell Oil Company.
Article "Solid Phase Processes" in Jan. 1978 Plastics World.
Article "Solid Phase Pressure Forming", P. R. Kelly and W. C. Burns, 1978-1979 issue of Modern Plastics Encyclopedia, p. 396, publd. by McGraw-Hill & Co., Inc.
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