Apparatus for relaxing stresses at the end of oedometric compact

Details Apparatus for relaxing stresses at the end of oedometric compact Apparatus for relaxing stresses at the end of oedometric compact

1987-06-24

1989-05-02

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Three or more platens movable on intersecting paths to...

100219, 100232, 249160, 249162, 264120, 4254517, 4254519, B28B 302

Patent

active

048264199

ABSTRACT:
The invention relates to a process for relaxing lateral stresses at the end of shaping by compacting of a block constituted by an aggregate and a binder (such as a carbon-containing paste), to which is applied a main monoaxial stress in a rigid mold having a bottom and four side walls. According to the process, at the end of compacting and along the compacting axis, there is maintained a residual stress of between 50 and 2000 kilopascals, and preferably between 100 and 500 kilopascals. At least two of the side walls of the mold are then moved apart by a few millimeters, followed by the elimination of the main stress and the extraction of the molded block. The residual stress is maintained for a period of between 1 and 20 seconds following the moving apart of the walls.

REFERENCES:
patent: 1625129 (1927-04-01), Meyers
patent: 1863609 (1932-06-01), Vanderkloot
patent: 3056653 (1962-10-01), Slayter
patent: 4666389 (1987-05-01), Relis et al.

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