Plastic and nonmetallic article shaping or treating: processes – Vacuum treatment of work – To degas or prevent gas entrapment
Patent
1987-03-02
1992-06-16
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Vacuum treatment of work
To degas or prevent gas entrapment
264 63, 2643282, 264344, 419 36, 419 37, 419 44, 419 60, 419 65, C04B 3806
Patent
active
051223260
ABSTRACT:
The present invention is a method of removing binder material which is non-sublimable at room temperature and pressures greater than 1 Torr from a binder and particulate mixture. The binder and particulate mixture is formed into a shaped article and placed in a closed furnace. The closed furnace is then adjusted to a pressure and temperature sufficient to effect transformation of the binder material from a solid to a vapor and diffusion of the binder material as a vapor through, and from, the binder and particulate mixture without formation of a liquid phase of binder material on the binder and particulate mixture surface. The shaped article is held under these processing conditions until substantially all of the binder material transforms to its vapor state and diffuses through, and from, the mixture into the closed furnace. The binder material vapor is then evacuated from the furnace through conventional means.
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Jackson Martha L.
Thompson Elliot
Derrington James
Pahl Jr. Henry D.
Vacuum Industries Inc.
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