Two-material automotive part is cored out with water.* A three-stage injection process involving nylon, polypropylene, and water assist was demonstrated at the recent K 2004 show in Dusseldorf, Germany. The part, an engine cooling pipe, illustrated the growing sophistication so·phis·ti·cate v. so·phis·ti·cat·ed, so·phis·ti·cat·ing, so·phis·ti·cates v.tr. 1. To cause to become less natural, especially to make less naive and more worldly. 2. of water injection and has aroused considerable interest among European auto makers. Similar parts reportedly are being evaluated at Volkswagen, Audi, and Daimler-Chrysler. Development of this 35-mm O.D. pipe involved molder and mold-maker Polytec Thermoplast GmbH of Idstein, Germany; material supplier A. Schulman; water-injection specialist PME PME Petites et Moyennes Entreprises PME Professional Military Education PME Pequenas e Médias Empresas (Portugal) PME Petite et Moyenne Entreprise PME Psychology of Mathematics Education PME Pi Mu Epsilon fluidtec GmbH; and machine builder Krauss-Maffei. A. Schulman supplied the 30% glass-filled nylon 66 for the outer skin of the pipe and the PP inner liner. Nylon provides resistance to under-hood temperatures, while PP provides a smoother inner surface and better resistance to hydrolysis hydrolysis (hīdrŏl`ĭsĭs), chemical reaction of a compound with water, usually resulting in the formation of one or more new compounds. by water/glycol engine coolant coolant (kōō´l  nt),n . Drawing on its experience in compounding nylon/PP alloys, Schulman modified both materials for better adhesion to each other. PME fluidtec in Germany supplies a pump system that controls the timing, pressure, and volume of water injection. It's newly available in North America from Husky and Krauss-Maffei. As shown in the schematic, this part was molded with a short-shot process that avoided the need for spillover spill·o·ver n. 1. The act or an instance of spilling over. 2. An amount or quantity spilled over. 3. A side effect arising from or as if from an unpredicted source: cavities or melt pushback push·back n. 1. A device or mechanism that affords movement of another object backwards: the pushback on a subway door. 2. Forced movement of troops back from the line. . Approximately 70% of the cavity was filled--first 40% with nylon and then 20% to 30% with PP--before water was injected to core out the part and cool it from the inside. The press was a 220-ton KM200-1000/3902 Multinject machine and cycle time was 48 sec. NEED TO KNOW MORE? For more information, enter PTDirect code at www.plasticstechnology.com Husky Injection Molding Systems Ltd Husky Injection Moulding Systems Ltd was founded by Robert Schad, a German immigrant who came to Canada in 1951 with $25 borrowed from an uncle and a letter from a family friend by the name of Albert Einstein. ., Bolton, Ont. (905) 951-5000 * PTDirect: 946LF Krauss-Maffei Corp., Florence, Ky. (606) 283-0200 * PTDirect: 327BD A. Schulman Inc., Akron, Ohio (800) 662-3751 * PTDirect: 687YD |
|
||||||||||||||||||||
Printer friendly
Cite/link
Email
Feedback
Reader Opinion