The following news briefs were gathered at NPE 1997, held June 16-20 in Chicago.
Buss America shows new feeding system
Buss America Inc. showed for the first time its more-efficient feeding system of low bulk density fillers on a 30-millimeter, lab-size MKS-30 Buss Kneader.
The Expanded Volume Input option incorporates an enlarged screw diameter and expanded barrel section for high loadings of materials such as carbon black, calcium carbonate and talc. The Bloomingdale, Ill., firm said the EVI system gives 30-40 percent more free volume and output gains of 30 percent or more because it improves material ingestion and wet-out.
The EVI can eliminate the need for a second gravimetric feed system and the side feeder to go with it, saving customers money, said Anthony Futia, Buss America's business manager.
Futia said his firm also showed a 70mm MKS machine that it will ship to its lab after NPE. It will equip the machine with an EVI for customer testing.
Buss America said it has delivered its first 140mm and 200mm MKS production-size machines to compounders. They have the MKS clamshell design for easy cleanout and changeover, a crosshead extruder to pressurize the die and hot die-face pelletizing. It claims the large extruders have throughput up to 12,000 pounds an hour.
Boston enhances single-screw models
Boston Matthews Inc. at NPE debuted its single-screw extruder series with redesigned downstream equipment.
The Norwood, N.J., firm said it offers extruders with diameters from three-quarters of an inch to 6 inches and screw torques from 197-16,412 pounds per foot. It said the machines are compact and have small footprints.
Rugged features include a thermistor-protected, direct-current motor with forced ventilation, a gearbox with double-reduction hardened and ground helical gears and a spherical roller thrust bearing. Barrel zones are equipped individually with cast aluminum heater and cooling fans and are thermocouple-linked to a PID auto-tuning temperature controller.
Boston Matthews said touch-screen microprocessor systems are optional, as are special screws and instrumentation. It also designs special extruders for devolatilization, high-temperature and corrosive applications.
Windward exhibits screw, barrel parts
Windward Products exhibited a line of screw and barrel parts for extruders, including twin-screw types.
The Wytheville, Va., firm became a division of Buss America Inc. early last year and has expanded as a supplier of original equipment manufacturer and replacement parts for compounders. William Wood, founder of Windward in 1980, is now sales manager for the division.
Windward, which exhibited separately from Buss America, said it offers wear- and corrosion-resistant barrel liners, kneading blocks and screw elements for all kinds of extruders, including the Buss Kneader. It uses computer- aided design and manufacturing to customize parts.
Wxtrusion Dies offers new die, feedback
Extrusion Dies Inc. showed for the first time a commercial extrusion die and feedblock based on its flexible-preland technology.
The Chippewa Falls, Wis., firm said the system fine-tunes polymer flow upstream of the lips of a flat die through adjustment of a stainless-steel membrane in the preland section.
James Johnson, vice president of sales and marketing, said the technology keeps die lips more parallel and minimizes the need for lip-adjustment systems. EDI's exhibit included a 1,000-millimeter flexible-preland die and a flexible-membrane coextrusion feedblock it claims provides greater control over layer-to-layer distribution than conventional feedblock profiling inserts.
EDI has exclusive U.S. and nonexclusive world rights to the flexible-preland technology developed by Kunststoff-Verfahrenstchnik of Rossdorf, Germany.
Sales strong for W&P high-output extruders
Werner & Pfleiderer GmbH has sold more than 30 of its high-output Mega compounding extruders, according to the new top executive of its U.S. operation.
Of the 30 machines sold, 20 of them have been set up and are running at compounding factories, said JÃ¶rg Pfeiffer, president and chief executive officer of Werner & Pfleiderer Corp.
The Mega compounder is the sixth generation of the company's ZSK twin-screw extruder.
Pfeiffer was named to the top spot at the Ramsey, N.J., company Jan. 1, replacing Dieter Gras, who retired. Pfeiffer is a member of W&P's managing board at company headquarters in Stuttgart, Germany.
W&P is part of Germany's Krupp Hoesch Maschinenbau group. Pfeiffer has worked for Krupp for 27 years.
The company introduced another executive —Rolf Lidl, chairman of W&P's managing board. Lidl, former president of another German machinery maker, Krauss-Maffei AG, joined W&P in September 1996.