Randcastle Extrusion Systems: Smallest spiral blown-film die

A 0.5-in.-diam. die measuring 2 x 4.5-in. with four tiny spirals is the smallest spiral blown-film die in the world, according to the builder, Randcastle Extrusion Systems Inc., USA. Randcastle first showed the latest mini die at May’s SPE ANTEC meeting in San Francisco. The die appeared on a new mini blown-film lab line with a 30 x 30 in. footprint (vs. 3 x 5 ft for Randcastle’s smallest before now). The object of the tiny film line, which incorporates an on-line rheometer parallel to the 5/8-in.-diam. extruder, is to minimize the amount of resin needed to make test samples. www.randcastle.com

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