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CHICAGO — The Plastics Machinery Division of Johnson Controls Inc. (Booth S2167) has introduced a new feed-screw design that raises blow molding throughput by 20 percent.

The technology has been used in JCI's Uniloy intermittent extrusion reciprocating screw blow molding machines. The series is used in high-volume production of lightweight, monolayer containers from 85 milliliters to 20 liters. The proprietary feed-screw geometry delivers the productivity gain without sacrificing a homogeneous mix, the company said.

``This type of screw typically permits an 8-10 percent reduction in melt temperatures, without raising power consumption,'' John Francis, JCI's product director, said in a news release. ``The lower temperatures reduce the chances of material degradation and enhance the finish, which is especially important in taste- and appearance-critical applications. It also brings greater control in processing expensive engineering resins,'' he said.

The feed screw was designed in collaboration with Great Lakes Feedscrews Inc. (Booth S967) of Tecumseh, Mich., and Robert Barr Inc. (Booth S1182) of Virginia Beach, Va.

Francis said the improved cooling ability of the new design permits the use of an air-cooled extruder barrel instead of liquid cooling.

``The reduction in cooling demands can help to shorten cycle times, simplify maintenance, and minimize downtime,'' he added.

The new Uniloy Series 2000, introduced at NPE, uses an advanced screw geometry that has been re-engineered. The feed-screw system is available on all new models and is being applied to other Uniloy designs, including the 400 series. It can reduce cycle times as much as 15 percent, the company claims.

Other features include a fixed die head for improved alignment, an enhanced mold cooling system, front die adjustment and an air-cooled extruder barrel.

Also at JCI's booth is the BW 6000DE machine, developed by JCI German subsidiary B&W. The machine offers a clamping force of 22 tons and a center-fed extrusion head for good wall distribution of the parison.

It can produce two 10-liter containers with two single-cavity molds.

JCI also supplies blow molds and tooling, and most equipment can handle multiple resin types, the company said.

JCI's Manchester, Mich.-based Plastics Machinery Division offers product lines that include shuttle and wheel machines, injection blow molding and injection stretch blow molding equipment.

Other Uniloy innovations include sequential extrusion to allow one-piece molding of components from multiple materials, and gas-assisted structural foam technology.