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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Characterization of Fiber Length Distribution in Short andLong-Glass-Fiber Reinforced Polypropylene during Injection Molding Process) ผู้เขียน: สมเจตน์ พัชรพันธ์ สื่อสิ่งพิมพ์:pdf AbstractThe reduction in fiber length during injection molding of two commercial glass-fiber reinforced polypropylene (PP) granules was studied. The first containing 20 percent by weight (wt%) of shortglass- fibers with the average fiber length around 350 ?m and the other filled with 40 wt% of relatively much longer fibers mostly around 7,000 mm. The fiber length distribution (FLD) was measured along the screw channels and after the molten composite was injected through a nozzle of an injection unit. The results indicated that the FLD moved to shorter fiber lengths along the screw channels further from the hopper. In both cases, fiber attrition occurred predominately in the feed and the compression zones, particularly in long-glass-fiber reinforced polypropylene. More severe fiber attrition in this finding can be assumed due to higher fiber concentration and longer fiber length which result in a higher degree of fiber-fiber interaction and increased fiber-wall contacts. |
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