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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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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Properties of Recycled Plastics from HDPE Drinking Water Bottles) ผู้เขียน: นางสินีนาถ จริยโชติเลิศ, ผู้ช่วยศาสตราจารย์ , Naruekmon Kooudomrut, Wipada Rittisith สื่อสิ่งพิมพ์:pdf AbstractThe growing amount of plastic bottles have caused plastic waste problem in Thailand and elsewhere. In this paper the recycling of drinking water bottles made of HDPE was studied. Collected waste bottles were ground to small pieces and then mixed with virgin HDPE resin at the composition of 0, 20, 25, 40, and 50% recycled plastics. The effect of adding 0, 10, 20 and 30% (w/w) of calcium carbonate as plastic filler was also studied. The mixed compound was injection molded into dumbbell – shaped testing samples and tested for density, tensile strength and elongation. The result showed that increased recycled plastics significantly reduced density and tensile strength but increased elongation of tested samples. Addition of calcium carbonate also significantly decreased both tensile strength and elongation. The chosen quantity of recycled plastics in compounded mixture was 20% and calcium carbonate content of 10%. The recycled HDPE was utilized by injection molding into flowerpots or multi-purpose trays. |
ที่มา:การประชุมทางวิชาการของมหาวิทยาลัยเกษตรศาสตร์ ครั้งที่ 46หัวเรื่อง:การวิเคราะห์ความยาวของเส้นใยแก้วในระหว่างกระบวนการฉีดขึ้นรูปชิ้นงานเทอร์โมพลาสติกคอมโพสิต |
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