Plastics News reporters gathered these news items during the NPE2009 trade show, held June 22-26 in Chicago.
EDI flat-die coating reduces corrosion
Extrusion Dies Industries LLC has a new surface coating for flat dies that withstands most attacks from corrosive hydrochloric acid generated during the extrusion of PVC.
Thermal degradation of PVC caused by heat and shear during extrusion generates the corrosive gas that can cause extensive damage to dies with conventional surfaces.
DuraCoat is inert when exposed to harsh chemicals, according to Gary Oliver, EDI vice president of technology. Although recommended for PVC foam, film and sheet, the firm is exploring uses with other corrosive plastics.
The new coating forms an extremely thin film on the steel surface of the die that has no effect on even the most intricate features machined into flow surfaces, Oliver said in a news release.
Slip release compares with standard chrome plating. The coating exhibits high hardness, very high melting and oxidation temperatures and insolubility in most acids and bases.
EDI also said its dies are used for precise coating and film layers within high-efficiency lithium-ion batteries. The multilayer structures in the batteries generate electrical power and are designed to perform for thousands of charging cycles.
Buss expands uses for Quantec kneader
Buss AG has improved its four-flight Quantec kneader, making it possible to compound rigid PVC with up to 100 parts per hundred resin.
The kneader's process zone has been extended to a 15-to-1 length-to-diameter ratio. A downstream vertical intake screw has been added for feeding fillers directly into the gelled PVC melt. Both these expanded intakes have a larger housing and screw diameter, allowing the largest volume of filler to be added.
In trials, the Quantec showed throughputs as high as 858 pounds per hour at fillings of 100 pounds phr of calcium carbonate.
Buss, based in Pratteln, Switzerland, said the four-flight Buss MX kneader is successful in applications beyond cable compounds. The firm said new applications cover most temperature- and shear-sensitive high-fill compounds.
For the same machine size, throughput of the kneaders is 21/2 times that of previous models.
PTi upgrades Titan for next generation
Processing Technologies International LLC's Titan Plus sheet production controller, like its Titan predecessor, is based on the rugged Allen-Bradley ControlLogic software platform and the PanelView operator interface.
The Titan Plus is PTi's new generation of reliable, modular and scalable control systems designed to provide operators with full line control, diagnostic and trending capabilities.
Using a two- or three-screen console that swivels 180 degrees, the operator can make changes more easily on the machine; for example, adjusting the gap on the chill rolls. Using Videogap technology, a live video feed from cameras on the machine can roll on one screen, while the operator can make gauging adjustments and see the results on the other screens, said the Aurora, Ill.-based firm.
Titan Plus also has voice annunciation: When problems occur, a voice tells the nature of the problem in English, Spanish, Russian or Chinese.
Kiefel demonstrates new cooling devices
CHICAGO Perfect Cool Vario and Perfect Cool Duo are Kiefel Technologies Inc.'s latest in high-output cooling devices in blown film technology.
Both the Vario and Duo are designed for big extrusion lines, such as those used to make shipping sacks.
The Vario model comprises a single air ring that is adjustable for maximum cooling. The Duo version has a double air-ring system that is adjustable for more cooling, according to Hampton, N.H.-based Kiefel Technologies.
More cooling means more output, President James Ciolino said in an interview at the company's booth at NPE2009. They're great for a range of polyethylenes.
Kiefel Technologies is the U.S. unit of Kiefel GmbH, based in Freilassing, Germany.
Gearless extruder hits single-screw speeds
American Kuhne Inc. displayed a new gearless extruder designed to run at conventional single-screw speeds.
The price of motors is coming down, making such equipment more cost effective, said Steve Maxson, sales manager for the Ashaway, R.I., company.
Gearless extruders are 10-15 percent more efficient at conventional screw speeds and present a smaller footprint and fewer maintenance issues.
Also on display is a modular extruder especially designed for medical and other short-run work. Barrel sections can be removed and replaced and cleaned out. Modules can be changed in about 15 minutes, according to Michael Brocato, aftermarket manager. Barrel sizes can go up to 4 inches.
For in-line thermoforming, American Kuhne unveiled a high-speed, high-output sheet extruder that has a 72-millimeter screw.
With a direct-drive motor, the extruder has nominal capacity of 4,850 pounds per hour of polystyrene and 3,970 pounds per hour of polypropylene.
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