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

Full Title

Plastic and nonmetallic article shaping or treating: processes > 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 > having plural, distinct differential fluid pressure shaping steps > And heat-shrinking outside of mold including subsequent re-expanding of shrunken article using differential fluid pressure