Parallel Twin Screw Extruder.
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|
|Article Type:||Brief Article|
|Date:||Apr 1, 2000|
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