The Low Breaking Fiber Mechanism and Its Effect on the Behavior of the Melt Flow of Injection Molded Ultra-Long Glass Fiber Reinforced Polypropylene Composites
In this study, fiber breaking behavior, fiber orientation, length variation, and changes in melt flow ability of long glass fiber reinforced polypropylene (L-FRP) composites under different mold cavity geometry, melt fill path, and plasticization parameters were investigated. The matrix material use...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-07-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/13/15/2492 |
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| author | Po-Wei Huang Hsin-Shu Peng Sheng-Jye Hwang Chao-Tsai Huang |
| author_facet | Po-Wei Huang Hsin-Shu Peng Sheng-Jye Hwang Chao-Tsai Huang |
| author_sort | Po-Wei Huang |
| collection | DOAJ |
| description | In this study, fiber breaking behavior, fiber orientation, length variation, and changes in melt flow ability of long glass fiber reinforced polypropylene (L-FRP) composites under different mold cavity geometry, melt fill path, and plasticization parameters were investigated. The matrix material used was polypropylene and the reinforcement fibers were 25 mm long. An ultra-long-fiber composite injection molding machine (with a three-stage plunger and injection mechanism design) was used with different mold cavity geometry and plasticization parameters. Different screw speeds were used to explore the changes in fiber length and to provide a reference for setting fiber length and parameter combinations. Flow-length specimen molds with different specimen thickness, melt fill path, and gate design were used to observe the effect of plasticizing properties on the flow ability of the L-FRP composite materials. The experimental results showed that the use of an injection molding machine with a mechanism that reduced the amount of fiber breakage was advantageous. It was also found that an increase in screw speed increased fiber breakage, and 25 mm long fibers were shortened by an average of 50% (to 10 mm). Long fibers were more resistant to melt filling than short fibers. In addition, the thickness of the specimen and the gate design were also found to affect the filling process. The rounded angle gate and thick wall product decreased the flow resistance and assisted the flow ability and fiber distribution of the L-FRP injection molding. |
| first_indexed | 2024-03-10T09:09:52Z |
| format | Article |
| id | doaj.art-2241e0b164ce41cd8891473b34cc1453 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T09:09:52Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-2241e0b164ce41cd8891473b34cc14532023-11-22T06:03:45ZengMDPI AGPolymers2073-43602021-07-011315249210.3390/polym13152492The Low Breaking Fiber Mechanism and Its Effect on the Behavior of the Melt Flow of Injection Molded Ultra-Long Glass Fiber Reinforced Polypropylene CompositesPo-Wei Huang0Hsin-Shu Peng1Sheng-Jye Hwang2Chao-Tsai Huang3Program of Mechanical and Aeronautical Engineering, Feng Chia University College of Engineering and Science, Taichung 40724, TaiwanDepartment of Mechanical and Computer Aided Engineering, Feng Chia University College of Engineering and Science, Taichung 40724, TaiwanDepartment of Mechanical Engineering, National Cheng Kung University College of Engineering, Tainan 70101, TaiwanDepartment of Chemical and Materials Engineering, Tamkang University College of Engineering, New Taipei City 251301, TaiwanIn this study, fiber breaking behavior, fiber orientation, length variation, and changes in melt flow ability of long glass fiber reinforced polypropylene (L-FRP) composites under different mold cavity geometry, melt fill path, and plasticization parameters were investigated. The matrix material used was polypropylene and the reinforcement fibers were 25 mm long. An ultra-long-fiber composite injection molding machine (with a three-stage plunger and injection mechanism design) was used with different mold cavity geometry and plasticization parameters. Different screw speeds were used to explore the changes in fiber length and to provide a reference for setting fiber length and parameter combinations. Flow-length specimen molds with different specimen thickness, melt fill path, and gate design were used to observe the effect of plasticizing properties on the flow ability of the L-FRP composite materials. The experimental results showed that the use of an injection molding machine with a mechanism that reduced the amount of fiber breakage was advantageous. It was also found that an increase in screw speed increased fiber breakage, and 25 mm long fibers were shortened by an average of 50% (to 10 mm). Long fibers were more resistant to melt filling than short fibers. In addition, the thickness of the specimen and the gate design were also found to affect the filling process. The rounded angle gate and thick wall product decreased the flow resistance and assisted the flow ability and fiber distribution of the L-FRP injection molding.https://www.mdpi.com/2073-4360/13/15/2492fiber breaking behaviorflow abilityplasticizing propertiespolypropyleneultra-long-fiber composite |
| spellingShingle | Po-Wei Huang Hsin-Shu Peng Sheng-Jye Hwang Chao-Tsai Huang The Low Breaking Fiber Mechanism and Its Effect on the Behavior of the Melt Flow of Injection Molded Ultra-Long Glass Fiber Reinforced Polypropylene Composites Polymers fiber breaking behavior flow ability plasticizing properties polypropylene ultra-long-fiber composite |
| title | The Low Breaking Fiber Mechanism and Its Effect on the Behavior of the Melt Flow of Injection Molded Ultra-Long Glass Fiber Reinforced Polypropylene Composites |
| title_full | The Low Breaking Fiber Mechanism and Its Effect on the Behavior of the Melt Flow of Injection Molded Ultra-Long Glass Fiber Reinforced Polypropylene Composites |
| title_fullStr | The Low Breaking Fiber Mechanism and Its Effect on the Behavior of the Melt Flow of Injection Molded Ultra-Long Glass Fiber Reinforced Polypropylene Composites |
| title_full_unstemmed | The Low Breaking Fiber Mechanism and Its Effect on the Behavior of the Melt Flow of Injection Molded Ultra-Long Glass Fiber Reinforced Polypropylene Composites |
| title_short | The Low Breaking Fiber Mechanism and Its Effect on the Behavior of the Melt Flow of Injection Molded Ultra-Long Glass Fiber Reinforced Polypropylene Composites |
| title_sort | low breaking fiber mechanism and its effect on the behavior of the melt flow of injection molded ultra long glass fiber reinforced polypropylene composites |
| topic | fiber breaking behavior flow ability plasticizing properties polypropylene ultra-long-fiber composite |
| url | https://www.mdpi.com/2073-4360/13/15/2492 |
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