Study of effects of plasticization parameter on fiber fracture behavior and melt floe-ability of ultra-long glass fiber reinforced polypropylene composites injection molding

Kai Fu Liew, Hsin Shu Peng, Sheng Jye Hwang, Chao Tsai Huang, Po Wei Huang, Kuei Shan Chen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This study explored the fiber fracture length, fiber orientation, and melt flow-ability variations of long glass fiber composite materials under different plasticization parameter s. Polypropylene was selected as the molding material, and glass fibers with a length of 25 mm were selected for composite reinforcement. Using an ultra-long-fiber composite injection molding machine (with a three-stage plunger mechanism), injection molding experiments were conducted at different screw speeds and under back-pressures to explore fiber fracture variations. Fiber fractures during plasticization were also observed to provide a reference for setting parameters. Moreover, flow-length specimen molds with different gate designs and specimen thicknesses were designed to facilitate observation of the effect of plasticizing properties on the flow-ability of long glass fiber composite materials. The experimental results revealed that fiber length decreased as screw speed increased. Under the parameter of low screw speed and without back-pressure, 60% of the fiber length was retained. Under the parameter of high screw speed and back-pressure, fibers fractured and the fiber length was shorter than 10 mm. In addition, during the filling process of fiber-containing plastic material, the thickness of the product and the gate design affected the filling process. The thin-wall of the mold-cavity product increased the flow resistance and affected the flow-ability and fiber distribution of long glass fiber composite materials.

Original languageEnglish
Title of host publicationSPE ANTEC 2020
Subtitle of host publicationThe Annual Technical Conference for Plastic Professionals
PublisherSociety of Plastics Engineers
Pages768-775
Number of pages8
ISBN (Electronic)9781713821182
Publication statusPublished - 2020
EventSPE ANTEC 2020: Annual Technical Conference for Plastic Professionals - Virtual, Online
Duration: 2020 Mar 302020 May 5

Publication series

NameAnnual Technical Conference - ANTEC, Conference Proceedings
Volume2

Conference

ConferenceSPE ANTEC 2020: Annual Technical Conference for Plastic Professionals
CityVirtual, Online
Period20-03-3020-05-05

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Polymers and Plastics

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