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Parallel Twin Screw Extruder.

Milacron's new small-footprint parallel twin screw extruder, the Atlas 93, is said to offer powerful features for window profile processing. Like the manufacturer's 114 and 135 models, which it complements, the Atlas 93 is also said to be ideal for producing PVC pipe, siding, and sheet, as well as for processing various foam applications.

The counter-rotating parallel screws of the Atlas 93 have a length-to-diameter ratio of 26:1 L/D (measured from the downstream end of the feed port), says Milacron. The feed zone provides "exceptional" surface area, allowing efficient heat transfer to the feed material. Further, the manufacturer explains, a low compression ratio, distributed over a longer L/D ratio, reduces screw deflection and significantly extends the life of both screws and barrels.

All system features are designed into a "unitized base," simplifying installation, operation, and maintenance, says Milacron. Simple "drop-in-place" machine installations and single electrical drop requirements enable processors to be up and running quickly, the company adds. Standard features reportedly include:

*High-capacity four-shaft gearbox (unlike most other parallel twins screw extruders, which use a three-shaft design) with integral housing containing both reduction and distribution gearing for higher torque and thrust capacity;

*Metered dosing feeder for accurate intake volume and broad processing latitude;

*Consistent, controllable process heating and cooling system featuring five barrel process zones with the three downstream zones using water cooling--a design that is said to be "nearly maintenance free," compared with that of oil-cooled systems;

*Availability of microprocessor controls or discrete instrumentation at the same price;

*Subcomponents such as vacuum pump and motor, barrel cooling system and screw oil heating/cooling system mounted on slide-out trays for easy maintenance;

*Direct-coupled Reliance AC vector motor and drive system for extended service in PVC production;

*Milacron Exc microprocessor control, which "oversees" the extruder operation and provides a common, all-inclusive control station.
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Title Annotation:from Milacron
Publication:Plastics Engineering
Article Type:Brief Article
Geographic Code:1USA
Date:Apr 1, 2000
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