US PATENT SUBCLASS 264 / 906
.~.~ And heat-shrinking outside of mold including subsequent re-expanding of shrunken article using differential fluid pressure

Current as of: June, 1999
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264 /   HD   PLASTIC AND NONMETALLIC ARTICLE SHAPING OR TREATING: PROCESSES

900  DF  DIRECT APPLICATION OF FLUID PRESSURE DIFFERENTIAL TO SHAPE, RESHAPE (I.E., DISTORT), OR SUSTAIN AN ARTICLE OR PREFORM AND HEAT-SETTING (I.E., CRYSTALLIZING OF STRETCHED OR MOLECULARLY ORIENTED PORTION) THEREOF {5}
905  DF  .~ Having plural, distinct differential fluid pressure shaping steps {1}
906.~.~ And heat-shrinking outside of mold including subsequent re-expanding of shrunken article using differential fluid pressure

DEFINITION

Classification: 264/906

And heat-shrinking outside of mold including subsequent re-expanding of shrunken article using differential fluid pressure:

Process under cross-reference art collection 904 wherein a stretched or molecularly oriented workpiece is heated, outside of a mold, to contract at least one dimension thereof, thus forming a shrunken article; and thereafter applying a differential fluid pressure to enlarge the shrunken article.