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      Residual Wall Thickness Distribution at the Transition and Curve Sections of Water-assisted Injection Molded Tubes

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      1 , , , 1
      International Polymer Processing
      Carl Hanser Verlag

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          Abstract

          Water-assisted injection molding technology has been used to manufacture plastic tubes in recent years, due to its light weight, relatively lower resin cost per part and faster cycle time. The residual wall thickness around dimensional transitions and curved sections can significantly affect the strength of molded parts and is of great concern. This research investigated the uniformity of the residual wall thickness distribution in water-assisted injection molded circular tubes with dimensional variations and curved sections. Experiments were carried out on an 80-ton injection-molding machine equipped with a lab scale water injection system, which included a water pump, a pressure accumulator, a water injection pin, a water tank equipped with a temperature regulator, and a control circuit. The material used was semi-crystalline polypropylene. It was found that the wall thickness was not uniform near transitions. With the addition of fillets with proper angles around transitions, the uniformity of residual wall could be greatly improved. The residual wall thickness in curved sections was thick around the outer wall and thin around the inner wall. In addition, the experimental results suggest that water-assisted molded parts exhibit a more uniform thickness distribution at transition and curved sections than in gas-assisted molded parts.

          Most cited references13

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          Water-assisted injection molding of thermoplastic materials: Effects of processing parameters

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            Experimental investigation and numerical simulation of cooling process in water assisted injection moulded parts

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              Study on the residual wall thickness at dimensional transitions and curved sections in gas-assisted molded circular tubes

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                Author and article information

                Journal
                ipp
                International Polymer Processing
                Carl Hanser Verlag
                0930-777X
                2195-8602
                2007
                : 22
                : 1
                : 82-89
                Affiliations
                1 Polymer Rheology and Processing Lab., Department of Mechanical Engineering, Chang Gung University, Tao-Yuan, Taiwan
                Author notes
                Mail address: S.-J. Liu, Polymer Rheology and Processing Lab., Department of Mechanical Engineering, Chang Gung University, 259, Wen-Hwa 1st Road, Kwei-San, Tao-Yuan 333, Taiwan. E-mail: shihjung@ 123456mail.cgu.edu.tw
                Article
                IPP0130
                10.3139/217.0130
                f99ff8a1-8e44-45bb-9299-17f05c01273b
                © 2007, Carl Hanser Verlag, Munich
                History
                : 29 November 2005
                : 4 November 2006
                Page count
                References: 14, Pages: 8
                Product
                Self URI (journal page): http://www.hanser-elibrary.com/loi/ipp
                Categories
                Regular Contributed Articles

                Polymer science,Materials technology,Materials characterization,General engineering,Polymer chemistry

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