The Mokon Division of Protective Closures Co. Inc. introduced expanded features and capabilities for its Duratherm line of temperature-control systems for circulating water, at the Pl sticos de las Americas exposition, held April 10-12 in Miami. The Buffalo, N.Y., company introduced a smaller Duratherm model with compact cabinetry, measuring 281/4 inches by 16 inches by 243/4 inches, that can house 9 or 18 kilowatts of heating capacity and pump sizes of three-quarters or 11/2 horsepower.
The company also offers a new high-temperature, high-pressure design that can deliver 60 pounds per square inch of pressure and 300§ F operation. Duratherm also is available in higher heating capacities of 36 and 48 kilowatts.
Tel. (716) 876-9951; fax (716) 874-8048.
Battenfeld expands range ofHM presses
Battenfeld of America Inc. of West Warwick, R.I., has added larger-tonnage machines to its line of hydraulic modular presses, introduced at K'95 in Germany last year.
The machines have a hydro-mechanical clamp.
Originally, HM presses were available in clamping forces of 550-1,430 tons. Battenfeld now extends the range to 4,400 tons.
Tel. (401) 823-0700; fax (401) 823-5641.
Nissei introduces Triplement machine
Nissei's Triplemelt injection unit, which uses a three-step plastication method, is available in injection presses with clamping forces from 20-180 tons, Nissei Plastic Industrial Co. Ltd. announced.
Nagano, Japan-based Nissei introduced the Triplemelt last year at K'95 in Germany.
The technology uses a screw section that melts the plastic, a special mixing chamber and a plunger section. Because the melting screw does not move backward when melting, but only rotates, all the resin is subjected to the same heat history as it is melted. A back-flow prevention device stops resin from flowing back into the screw section, giving molded parts precise dimensions and weight, Nissei said.
Nissei's U.S. unit, Nissei America Inc., is based in Anaheim, Calif.
Tel. (714) 693-3000; fax (714) 773-0654.
Sandretto installs 6,000-ton machine
Sandretto Industrie srl of Turin, Italy, believes it has sold the large-tonnage injection molding machine ever installed in South America: a 6,000-ton press to United Trade Co. in Santiago, Chile.
United Trade is using the press to mold large polyethylene bins to store fruit. Each bin uses nearly 90 pounds of PE.
Sandretto's U.S. unit is based in Middleburg Heights, Ohio.
C.A. Lawton Co.'s Plastic Machinery Division introduced a 60-ton Automold Press, an automated compression molding machine for thermosets.
Lawton of De Pere, Wis., has used robotics to eliminate much of the conventional hardware required to move products. Features include a bowl feeder that prepares the molding compound pellets, which are fed with a transfer loader onto a robotic gripper. The apparatus loads inserts into the mold cavities and loads pellets into transfer pots. After resin is injected and the clamp opens, the gripper removes molded parts with culls attached. The robot positions the gripper over a degater, then loads molded parts into the degater to shear runner and culls. Parts then are moved to an offload station. An automated mold cleaner brushes and vacuums loose debris from the mold.
Tel. (414) 436-7620; fax (414) 436-7630.
New Screw geometries suited for extrusion
American Leistritz Extruder Corp. has introduced new screw geometries the company says are well-suited for injecting a high level of liquid into an extruded product, whether pellet, laminate, sheet, film, fiber or foamed profile.
When liquids are injected over the hexa-lobal counter rotating screws, there is less tendency for liquid to pool, because of a dramatically increased lobe count, Somerville, N.J.-based Leistritz said. The screw channels are weak mixers for liquids. Instead, the company said, most mixing happens in the overflight region and in places where the material approaches a lobal shape.
Liquids injected include plasticizers and oils, liquid gases, tackifiers, latex and water. Leistritz supplies gear pump, or piston pump, liquid injection systems to use with the extruder.
Tel. (908) 685-2333; fax (908) 685-0247.
Firms say extruders enable faster cooling
Welding Engineers Inc. and Toshiba Machine Co. Ltd. unveiled a patented barrel for their twin-screw compounding extruders, which Welding Engi-neers makes in Blue Bell, Pa., under a joint venture agreement.
The companies claim the barrel is better than the standard parallel-channeled nitrided barrel. The barrel provides a larger window of operating temperatures.
The new barrel features a cast carbide lining that enables 50 percent quicker cooling times. In uses where the melt temperature is limited, the barrel allows much lower operating melt temperatures and higher production.
Tel. (215) 643-6900; fax (215) 643-6960.