American Maplan Corp. will highlight its twin-screw extruders and screw technology for vinyl siding at K 2004, Oct. 20-27 in Dusseldorf, Germany.
The use of long screws, with a 26-to-1 length-to-diameter ratio, improves heat transfer, increases melt homogeneity and gives good proc-ess control. The combination of high screw torque and low revolutions per minute yields a gentle mixing action, reducing shear and improving melt quality, according to Maplan of McPherson, Kan.
Maplan offers combinations of extruders and coextruders designed for vinyl siding. The combination of a TS135 main extruder and TS92 coextruder pumps out more than 4,000 pounds of siding an hour. A lower-volume choice, the TS110 main extruder and DSK62 coextruder, produces more than 2,000 pounds an hour.
Maplan has developed screws that process both rigid vinyl and acrylic capstock.
The company's Active Conical System can be retrofitted onto competing extruders to make capstock. The design reduces flight depth in the feed zone and increases depth in the metering zone.
Tel. (620) 241-6843, fax (620) 241-0207, e-mail [email protected]