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Die swell, also known as extrudate swell or Barus effect, is a common phenomenon in polymer processing. Die swell occurs in instances of polymer extrusion, in which a stream of polymeric material is forced through a die, a specialized tool in manufacturing to shape or cut polymeric materials. Die swell is an instance where a polymer stream is compressed by entrance into a die, and is followed by a partial recovery or “swell” back to the former shape and volume of the polymer after exiting the die, hence the term die swell.
Shut-off nozzle for injection molding
A novel shut-off nozzle for injection molding systems is disclosed herein for producing and injecting foamed polymers to form products and other parts. The shut-off nozzle is designed to increase cell nucleation during the foaming process, increase the rate of pressure drop as the polymer is injected into the mold, and stop the die swell of the foamed polymer at the end of the injection cycle. The shut-off nozzle includes an angled shut-off needle, which significantly reduces the amount of waste per injection cycle, and a water-cooled circuit for rapidly cooling and solidifying the molten polymer remaining in the shut-off nozzle at the end of each injection cycle.
Owner:MOXIETEC LLC