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In Process 18617

July 3, 2006

4 Min Read
In Process

Entek has upgraded the screw on its 53-mm corotating twin-screw lab extruder, which features two vacuum ports, a side feeder, and a melt pump, to go from 500 lb/hr throughput to 1600 lb/hr.

Wood-fiber decking boosted by extruder

Initially meeting with Entek Extruders (Lebanon, OR) during NPE 2003, building products manufacturer Louisiana-Pacific Corp. (LP; Nashville, TN) eventually chose the corotating twin-screw extruder manufacturer to supply production lines for its LP WeatherBest decking products, including its premium grain decking.

LP chose Entek because of the high throughput of Entek?s equipment and Entek?s willingness to help develop LP?s composite line. Working to create the best formulation of wood flour, plastic, and additives, as well the most efficient process in terms of temperature and pressure, LP used Entek?s lab in Oregon to perfect its product. LP now has multiple 103-mm Entek extruders in place throughout the United States., with more on order. To learn more about Entek Extruders, visit www.entek-mfg.com.

Fiber-reinforced polyurethane for building market

Working in PVC, wood, and aluminum to create windows and doors, Jeld-Wen (Klamath Falls, OR) has added glass-fiber-reinforced polyurethane (PUR) to its portfolio via Krauss-Maffei?s LFI process. The company is producing door skins from the glass-fiber PUR, with fiber content as high as 40%, for entryways that can endure harsh climates and remain resistant to rot or splintering.

The LFI process chops glass-fiber rovings into filaments prior to being fully wetted within the PUR reaction system mixing head. This mix is sprayed into open molds, which close to compress the composite into a high-strength structure. Krauss-Maffei reports that compared to glass mat processes, its LFI technology reduces costs and manufacturing steps. Glass-fiber rovings are cheaper than glass mat, and eliminating the mat also obviates the need to shape and place it in the mold prior to PUR introduction. The company also says the chopped fibers can be uniformly wetted with isotropic distribution in the mold to create high-strength parts with low thermal expansion. For more information on Krauss-Maffei, go to www.krauss-maffei.de.

Reclaimed low-density film gets stuffed

Ameri-Pak Inc. (Fountain Inn, SC) has added a 6-inch (150-mm) Davis-Standard Ram Stuffer extruder to reprocess low bulk-density materials, such as polyethylene-based films. Ameri-Pak is a toll reprocessor that handles shredded films and woven and nonwoven materials, reprocessing them into pellets. Ameri-Pak was already using a 4.5-inch Davis-Standard extruder.

The Ram stuffer is equipped with a vacuum pump to vent gasses, which widens the range of materials it can process. The feed throat?s pneumatic ram works to compress light materials into the screw area, where they can be reconstituted into melt. The throat?s grooved design augments this feeding action, and a custom barrier screw helps create a homogenous mix of reclaimed materials. The throat and hopper are kept separate from the ram system to minimize fluff transfer into the plunger enclosure. Throughput is further enhanced by the widened feed throat, which is reportedly 12-14 times the size of most throat openings. Cleaning is simplified by a filtered-air vent and cleanout port positioned above the ram.

Ameri-Pak will integrate the system into its recently expanded operation. After moving into a new 55,000 ft² plant in August 2004, Ameri-Pak added an additional 31,000-ft² in early 2006. For more information about Davis-Standard, go to www.davis-standard.com.

Cast stretch-film stretches output

Ukrainian cast stretch-film manufacturer HekroPET (Khmelnitsky) has installed Battenfeld Gloucester?s first cast-stretch line in the country using its cast 2020 product line to create five-layer 3m-wide film in a turnkey system with simultaneous production of six 500-mm-wide rolls.

The cell is capable of 600m/min output and is intended to tap the growing Commonwealth of Independent States (CIS) market, which consists of 11 former Soviet republics, including Armenia, Belarus, and Russia. Battenfeld estimates an 80,000-ton market volume in the CIS for stretch film, with an annual growth rate greater than 8%.

HekroPET uses two 90-mm and two 130-mm Contracool extruders with integrated Dynisco screen changers and gravimetric feeding of four to five components for a net production capacity of 1800 kg/hr. The line features an automatic flat-film die from Cloeren, inline edge-trim reclaim, infrared thickness measuring, and a fully automatic core feeding and roll take-off system, including a 1002-DS dual-turret winder. The full line is controlled by the Extrol Plus system. For more information visit Battenfeld Gloucester at www.bge.battenfeld.com, Cloeren at www.cloeren.com, and Dynisco at www.dynisco.com.

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