Effects of process parameters on fiber length, fiber orientation, air traps and mechanical properties of injection-molded long-glass-fiber-reinforced polypropylene

Kuei Shan Chen, Yu Kang Peng, Po Wei Huang, Sheng Jye Hwang, Huei Huang Lee, Hsin Shu Peng, Chao Tsai Huang, Chun I. Tu

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

Abstract

A long-fiber-reinforced thermoplastics (LFRTs) injection molding machine was designed and fabricated to have the capability to injection molding LFRTs and maintain fiber length during the molding process. Besides machine and cavity design, different molding process parameters would also affect the fiber length, fiber orientation, air traps and mechanical properties of LFRT parts. Thus, this paper is intended to study the influence of key processing parameters such as back pressure, screw speed, and melt temperature of injection molded LFRT parts on their fiber length, fiber orientation, air traps and mechanical properties. Image processing device such as optical microscope was used to identify the fiber length, fiber orientation and air traps. Mechanical test system was used to measure the tensile strength of the parts. Different melt paths were designed to count the influence of cavity design on the mechanical performance of the parts. The results showed that high screw speed and back pressure could damage and shorten the fiber length of the injection molded parts, and consequently cause fiber orientation varied under such process conditions. Higher melt temperature would decrease the viscosity of the polymer melt and increase fluidity thus better the mechanical performance of the parts. It was also found that parts at different mold cavity locations would exhibit different mechanical properties.

Original languageEnglish
Title of host publicationSPE ANTEC 2020
Subtitle of host publicationThe Annual Technical Conference for Plastic Professionals
PublisherSociety of Plastics Engineers
Pages840-847
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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