Colored inorganic-pigmented long-fiber thermoplastics

Vaidya, Uday; Thattaiparthasarthy, K. Balaji; Pillay, Selvum; Vaidya, Shalmalee; Ning, Haibin; Bansal, Dhruv

doi:10.1177/0892705713515262

Cited by 4 publications

(8 citation statements)

References 4 publications

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“…Vaidya et al 35 produced 12 mm Glass/PP LFT pellets using a TPC pultrusion process. These pellets were blended with inorganic pigment-colored compound pellets in order to study the processing and performance of inorganic-pigmented colored LFT in comparison with unpigmented LFT.…”

Section: Introductionmentioning

confidence: 99%

Effect of Flax/PP pellets’ morphology on the mechanical properties of injection-molded parts

Alsinani

Lebel

2022

Journal of Thermoplastic Composite Materials

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Flax and polypropylene (PP) pultrudates of 4.76 mm in diameter were produced using a multi-die pultrusion system. The flax content was 50 vol.%. Pultrusion conditions were varied to produce four porosity content between 4% and 22%. The pultrudates were pelletized into lengths of 6 and 15 mm, and injection-molded with pure PP to reduce the part flax content to 25 wt.%. Results showed that well consolidated pultrudates, having porosities up to 8%, were more resilient to the pelletizing process such that the pellets remained structurally intact after the process. These pellets went smoothly through the hopper into the injection molding machine screw. Pellets with void content higher than 8% lost integrity during pelletizing leading to uniform mixing. Exposed fibers segregated from the polymer in the hopper leading to ununiform mixing. The highest mechanical properties improvement compared to pure PP was using 15 mm pellets that had a prorosity of 8%. The tensile modulus doubled at 4652 ± 113 MPa. The impact strength increased by almost five times at 10.5 ± 0.7 [Formula: see text]. 15 mm pellets provided 1.7 times the impact strength of the 6 mm pellets. These improvement are attributed to low flax fiber thermal degradation and improved fiber dispersion.

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Section: Introductionmentioning

confidence: 99%

Effect of Flax/PP pellets’ morphology on the mechanical properties of injection-molded parts

Alsinani

Lebel

2022

Journal of Thermoplastic Composite Materials

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“…Additives are a substance added to a certain material in small quantities to improve its properties. Additives have been added to LFT composites for several purposes, such as lowering the material cost, increasing the modulus [55], improving the appearance [289], and increasing flame retardancy [59,121,310,311]. Pigments have been blended into LFT to provide colorisation.…”

Section: Additive Materials For Lftsmentioning

confidence: 99%

“…LFTs have also found use in other fields such as transportation [123][124][125][126], medical devices [43,[127][128][129], military [39,[130][131][132], sports equipment such as surf boards [99] and sail boats [133], laptop computer housings [134], safety equipment such as fire extinguishers [135], dumpster covers [134], gears [136], and oil and gas drilling components such as bushings [134], buoyancy collars and hardware [137][138][139]. Some of those unconventional applications require the LFT material endure extremely high pressure [131,135,[137][138][139], highly corrosive media [99,133,134,[137][138][139], and even exceptionally elevated temperature despite for a short period of time [131].…”

Section: Introductionmentioning

confidence: 99%

A review of Long fibre thermoplastic (LFT) composites

Ning

Lü

Hassen

et al. 2019

International Materials Reviews

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Long fibre-reinforced thermoplastic or long fibre thermoplastic (LFT) composites possess superior specific modulus and strength, excellent impact resistance, and other advantages such as ease of processability, recyclability, and excellent corrosion resistance. These advantages make LFT composites one of the most advanced lightweight engineering materials and enable their increasing use in various applications. This review paper summarises the research and development work that has been conducted on LFT composites since their initial development. Different aspects of LFTs, such as process development, fibre orientation distribution (FOD), fibre length distribution (FLD), and their effects on the mechanical properties of LFT composites are described. The characterisation of the FOD and FLD in the LFT composites using advanced imaging technology such as highresolution 3D micro-CT scanning technique is summarised. Research and development of LFT hybridisation and LFT additives are also discussed. Finally, conclusions are made and the future outlook of LFT composites is given.

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“…8 LFT pellets are frequently produced using a thermoplastic composites (TPC) pultrusion process. 9,10 Pultrusion has drawn recent interest from academics after overcoming persistent impregnation and cooling problems. [11][12][13][14] Through the TPC pultrusion process, strand precursors that contain the reinforcement and polymer fibers are wound into bobbins that are positioned in a creel.…”

Section: Introductionmentioning

confidence: 99%

Effect of high pulling speeds on the morphologies of pultrudates in a thermoplastic pultrusion process

Alsinani

Lebel

2022

Journal of Thermoplastic Composite Materials

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During thermoplastic pultrusion, increasing the pulling speed generally leads to a melted polymer pressure rise in the pultrusion dies. Yet, it was not clear if the polymer pressure’s increase would result in a faster impregnation flow that would compensate for the lower residency time inside the heating dies. Thus, the aim of this study was to verify if the speed-induced pressure can counterbalance the decrease in residency time that is required for impregnation quality and to analyze possible pultrudate morphology’s reconfiguration. Three distant pulling speeds were selected: namely 50, 500 and 1000 mm/min. Using a model, the polymer pressure in the pultrusion dies was computed to reach up to 1.0, 10.42, and 20.6 MPa for the respective pultrusion pulling speed. The morphology’s characterization showed a reconfiguration of the pultrudate at a higher pulling speed leading to larger unimpregnated agglomerations and polymer rich areas. The highest tensile strength achieved was 233.4 ± 1.5 MPa at 50 mm/min and dropped by around 20% when the pulling speed was raised to 1000 mm/min. The pultrudate reconfiguration at higher speed, attributed to delayed melting of PP fibers in underfilled dies, is deemed responsible for the loss in impregnation and mechanical properties.

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Colored inorganic-pigmented long-fiber thermoplastics

Cited by 4 publications

References 4 publications

Effect of Flax/PP pellets’ morphology on the mechanical properties of injection-molded parts

Effect of Flax/PP pellets’ morphology on the mechanical properties of injection-molded parts

A review of Long fibre thermoplastic (LFT) composites

Effect of high pulling speeds on the morphologies of pultrudates in a thermoplastic pultrusion process

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