Senior reporter Bill Bregar gathered the following items from the Plastics Show, which was held May 18-20 in Atlanta.
LIM makes its debut on 100-ton Prolwer
Milacron Inc. debuted its LIM (liquid injection molding) process on a 100-ton Prowler injection press making a silicone-rubber automotive valve.
Milacron plans to offer LIM capability on all of its presses with clamping force of less than 300 tons, including Prowler presses, the Roboshot all-electric machines, Vista V series and Vector vertical-clamp machines.
The company introduced LIM on the Prowler first, because that machine's open frame and oversized platens can handle large molds easily in a lower-than-normal tonnage clamp, Jim Moore, vice president of sales at Milacron's Plastics Technologies Group in Batavia, Ohio, said.
``As a low-pressure molding process, LIM doesn't require as much clamp tonnage per projected square inch of mold surface,'' Moore said.
Demag goes modular with injection press
The Atlanta show marked the U.S. debut for the Ergotech Modular injection press from Demag Ergotech GmbH.
The ``modular'' aspect refers to a choice of tie-bar dimensions, injection units and screw-and-barrel diameters. For each clamping-force size, buyers can pick between two different tie-bar spacings, four injection units and three screw diameters.
Since the K show, Demag has filled a gap between its 55-ton and 88-ton Ergotech Modular machine, with a new 66-tonner. That size was on display in Atlanta.
Frank Humpert, regional sales manager based at the company's Mooresvile, N.C., technical center, said injection on the Modular is powered by a piston that rotates, and moves forward and back with the screw.
The motor remains stationary, unlike other designs, Humpert said.
German-based Demag Ergotech is represented in the United States by Van Dorn Demag Corp. of Strongsville, Ohio.
Shuman introduces purging compound
Shuman Plastics Inc. of Depew, N.Y., introduced the Dyna-Purge F purging compound to its product mix.
Dyna-Purge F is designed for cleaning extruders that make single-layer film and sheet, at temperatures of 320°-420°F.
When the purging compound is subjected to heat, it expands and foams to reach all the gaps in the system and purge out old resin. A nonchemical active ingredient improves cleaning power without the need to dismantle the machinery, the company said.
Shuman Plastics said Dyna-Purge F flows through the barrel, screen pack, dies and metering devices. Also, it has unlimited shelf life.The new Iceman SC Series chiller uses a scroll compressor, which has 70 percent fewer moving parts than standard reciprocating-type compressors, according to the Mokon Division of Protective Closures Co. Inc.
When turned off, reciprocating compressors can be damaged when the coolant gas migrates to warm parts of the compressor, Mokon said.
That does not happen with the scroll design, said Buffalo-based Mokon.
The Iceman boasts fewer moving parts
The Iceman SC also runs more smoothly than reciprocating models, which are powered by valves and piston strokes, the company said.
Iceman SC chillers come in water- and air-cooled models, in cooling capacities from 2-15 tons.
Comet shows blender that meters powders
Comet Auxiliary Systems Inc. of Dayton, Ohio, showed a blender for processing powders, such as talc, slip agents and colors.
Comet said its Exact-A-Batch Gravimetric Blender-MP (for ``metering powder'') has a patented dispenser for powders that are not free-flowing.
For the free-flowing resin pellets, the MP uses a quick-acting pinch valve instead of a slide gate, which Comet says can wear and jam.
The pinch valve weighs each ingredient as it is deposited into the scale hopper, giving greater accuracy than other methods, which weigh each batch at the end, and it adjusts batches that follow.
The price is $10,500.