Tungsten carbide coating and a new grinding technique allow Extrusion Dies Industries LLC in Chippewa Falls, Wis., to cut flat-die lips for biaxially oriented PET with much sharper radii than usual.

Tungsten carbide coating and a new grinding technique allow Extrusion Dies Industries LLC in Chippewa Falls, Wis., to cut flat-die lips for biaxially oriented PET with much sharper radii than usual. The EverSharp die lip (bottom photo) has a 0.001-in. radius vs. 0.008 in. for the standard chrome-plated lip (top photo). Sharper edges prevent die build-up, which can leave die lines on sheet, and reduce downtime for cleaning and sharpening. EDI first sharpens the lip; then Praxair Surface Technologies in Indianapolis applies the tungsten carbide coating with a patented gun that “shoots” the coating at such high speed that it penetrates the steel. EverSharp edges can be applied to new or existing dies. EDI is the exclusive flat-die licensee for Praxair’s coating.