Manufacturing Industry
Melt-oscillation molding enhances part properties.(Close-Up: INJECTION MOLDING)
Plastics Technology, April, 2007 by Knights, Mikell
Research into a new melt-oscillation approach for injection molding has yielded a means of enhancing mechanical properties without use of fillers or additives. The technique also can move, hide, or reduce weld lines and correct orientation defects.
A team of professors, research associates, and students at the P.C. Rossin College of Engineering and Applied Science at Lehigh University in Bethlehem, Pa., developed a new Vibration Assisted Injection Molding (VAIM) process that uses low-frequency oscillation of the injection screw. Axial motion of the screw oscillates the injection pressure, which better aligns the molecules to improve part strength, explains Prof. John P. Coulter, associate dean and leader of the research team. "By manipulating the melt through...
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