Machinery News

New pelletiser die design

US-based Crown Machine, provider of compounding, recycling, pipe/profile and sheet extrusion equipment, has developed underwater pelletising dies that eliminate die-hole freeze off.

The new die designs incorporate 15% patented additives, boron and ceramic in a medium grain tungsten carbide material. The alloy is used for solid ring or segmented construction of a 0.240 in. thick die face. The dies allows melt up to 650°F to flow through the die holes and cold water down to 34°F to contact the cutting surface. The melt leaves the die holes and enters the cutting chamber without encountering turbulence. The tungsten carbide material is shaped via EDM, followed by VSR/TSR (vibratory stress relief/thermal stress relief) conditioning to create a tough and durable die.