Engel presses to use Trexel foam process
Engel North America has licensed Trexel Inc.'s MuCell microcellular foam technology from Trexel Inc. of Woburn, Mass.
Engel North America, of Guelph, Ontario, will make injection molding machines using MuCell. All machines also will be capable of conventional molding.
Until recently, MuCell was only commercially available for extrusion. Now it can be used for injection molded parts as thin as two-hundredths-inch.
The process uses low pressure, but it's different from structural foam molding, according to Dan Szczurko, Trexel's vice president of business development. MuCell uses very tiny bubbles, measuring 5-10 microns, and controls the process much better than structural foam, he said.
Szczurko said the process controls temperature and pressure of the gases to create supercritical fluids—fluids that have the pumping properties of a liquid and yet diffuse like a gas.
According to Trexel, benefits include controlled weight reduction of up to 60 percent, lower processing temperature, up to 40 percent lower clamp tonnage, up to 50 percent lower fill pressure and faster cycle times. Even though they use less material, parts retain desirable properties such as high tensile strength, low permanent set and impact strength, Trexel said.
Next, Trexel will license the process for blow molders, Szczurko said.
Davis-Standard has double blow molder
Davis-Standard Corp. has introduced a new double blow molding machine and, for extrusion, Killion's new cast film/extrusion coating for high-temperature applications.
The Sterling Double/Double combines two accumulator-head blow molding units in a single machine. Both extruders, accumulator heads and clamp sections share a common hydraulic system, a single controller and a large air system. Extruder sizes range from 31/2-6 inches. Accumulator heads can pump up to 75 pounds of resin.
The Killion cast film and extrusion coating line is designed for pilot plant and small-production use. Screw diameter is 2 inches with a length-to-diameter ratio of 24:1.
Killion also has introduced the SDSP series of heavy-duty belt pullers for pipe, profile and tubing production.
The Killion pullers come in two standard models, defined by the belt width and length: The DSP-26 (4 inches wide by 26 inches long) and the DSP-30 (6 inches) pullers can be upgraded to alternating current vector and servo drives.
Davis-Standard is based in Pawcatuck, Conn.; the firm's Killion group is in Cedar Grove, N.J.
Contact Davis-Standard at tel. (860) 599-1010; Killion at tel. (973) 239-0200.
New Wayne extruder accents ergonomics
Wayne Machine & Die Co. has developed an extruder it claims is ``ergonomically ideal'' for running products on a crosshead die, such as wire insulation, coextruded tubing and fiber-optic sheathing.
The L-shaped control panel stands at 90 degrees to the extruder. The operator does not have to run around the die or reach over the trough to adjust the machine, Wayne Machine said. Another ergonomic innovation is a heated split clamp, allowing the operator to change crossheads by loosening only one bolt. The clamp remains fixed to the machine.
Tel. (973) 256-7374, fax (973) 256-1778, e-mail [email protected]