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April 2, 2003

3 Min Read
In Process

inpro1.jpgPolyamide-imide resin clip nuts help reduce corrosion

Clip nuts made of Torlon polyamide-imide (PAI) resin can be used in commercial aircraft to secure flooring, fairings, interior trim, and bulkheads. The clip nuts are said to reduce corrosion because they don?t scratch protective coverings on metal or corrode during use. Torlon clip nuts can take a torque load of more than 100 in/lb, reportedly matching the strength of metal clip nuts at a fraction of the weight.

Torlon PAI is high-strength, high-elongation, and has high chemical resistance. It maintains its strength over a wide temperature range up to 260C. It passes FAA flammability tests and is unaffected by aviation fluids. The resin can be injection molded, extruded, and compression molded.

For more information contact Solvay Advanced Polymers (Alpharetta, GA) at (770) 772-8200 or visit www.solvayadvancedpolymers-us.com.

inpro2.jpgVinyl compounds prevent clotting in medical devices

Resins with anticlotting molecules integrated into their composition can be copolymerized into PVC polymers using a technology developed by Vestolit GmbH & Co. The European PVC manufacturer granted Teknor Apex exclusive rights to develop and produce vinyl compounds with the blood clot-preventing molecules incorporated directly into the PVC backbone. The announcement was made by the two companies at February?s MD&M West exhibition in Anaheim, CA.

The compounds are said to provide cost and performance advantages over the anti-clotting coatings currently applied to the inner surface of tubing, catheters, and other medical devices. Though the specialized copolymers cost more than standard medical-grade vinyl, device manufacturers can coextrude the compound onto standard vinyl in thin layers. This raises the overall material cost by less than the added cost of current coating methods. The bioactive compounds imbedded in the resins are permanent. They will not wear off or affect the patient?s blood the way current coating methods can.

Teknor Apex expects to have anticlotting compounds ready for commercialization in about two years. For more information contact Vestolit GmbH (Marl, Germany) at +49 (2365) 4905 or visit www.vestolit.com. Teknor Apex (Pawtucket, RI) can be contacted at (401) 725-8000 or www.teknorapex.com.

Self-cleaning filters purify water

Plastics processors operating on closed loop water filtration systems face the constant battle of filtering water so production isn?t impeded. Environmental contaminants like rust, sand, dust, and biological organisms, as well as inherent traces of calcium and magnesium in water, can have an adverse effect on efficiency. One study showed that as little as .002-inch contamination in a cooling line can increase pumping needs by 20 percent.

Fiberlux (Holmes, NY), a designer and manufacturer of vinyl window systems, was experiencing such problems in a dual manner since water in its closed loop system is used for cooling and as a sealing agent in vacuum pumps. The quality of its finished product suffered and frequent production interruptions were necessary to clean the filters.

Fiberlux installed two of Automatic Filters? Tekleen water filter products to solve the problem. The continuous, self-cleaning filters reportedly operate without requiring any maintenance.

As dirt collects on the filter screen, line pressure at the filter outlet drops. Once this pressure reaches a certain level, a back-wash cycle begins, and vacuum nozzles remove contaminants without affecting the main flow.

For more information on addressing water filtration needs, contact Automatic Filters Inc. (Los Angeles, CA) at (310) 839-2828 or visit www.tekleen.com.

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