A Study of Fibre Attrition in the Processing of Long Fibre Reinforced Thermoplastics

Bailey, R. S.; Kraft, Harald

doi:10.3139/217.870094

Cited by 88 publications

(15 citation statements)

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“…It is well known that the processing of glass fibres into injection moulded composites leads to large reductions in the fibre length (8)(9)(10)(11)(12)(13)(14)(15)(16)(17). Figure 6 shows the weight average residual fibre length (L w ) versus fibre concentration.…”

Section: Fibre Lengthmentioning

confidence: 99%

“…The properties of thermoplastic composites result from a combination of the fibre and matrix properties and the ability to transfer stresses across the fibre-matrix interface. Variables such as the fibre content, aspect ratio, strength, orientation and the interfacial strength are of prime importance to the final balance of properties exhibited by injection moulded thermoplastic composites (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17). Fibre strength may be reduced significantly after fibre formation by damage caused during both the fibre and composite production processes (16,17).…”

Section: Introductionmentioning

confidence: 99%

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Micromechanical parameters from macromechanical measurements on glass reinforced polypropylene

Thomason¹

2002

Composites Science and Technology

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In recent years many elegant techniques have been developed for the quantification of composite micromechanical parameters. Unfortunately most of these techniques have found little enthusiastic support in the industrial product development environment. We have developed an improved method for obtaining the micromechanical parameters, interfacial shear strength, fibre orientation factor, and fibre stress at composite failure using input data from macromechanical tests. In this paper we explore this method through its application to injection moulded glass-fibre-reinforced thermoplastic composites. We have measured the mechanical properties and residual fibre length distributions of glass fibre reinforced polypropylene containing different levels of glass fibre. The level of fibre-matrix interaction in these composites was varied by the addition of maleic anhydride modified polypropylene "coupling agent". This data was used as input for the model. The trends observed for the resultant micromechanical parameters obtained by this method were in good agreement with values obtained by other methods. Given the wealth of microstructural information obtained from this macroscopic analysis and the low level of resources employed to obtain the data we believe that this method deserves further investigation as a screening tool in composite system development programmes.

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Section: Fibre Lengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Micromechanical parameters from macromechanical measurements on glass reinforced polypropylene

Thomason¹

2002

Composites Science and Technology

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“…Fibers in long-fiber thermoplastic composites (LFTS) initially have the length of the pellet, 10 to 13 mm, but few fibers with this length survive during polymer processing [1]. Mechanical properties of LFTs are highly dependent on the fiber length distribution [2].…”

Section: Introductionmentioning

confidence: 99%

Progress in modeling long glass and carbon fiber breakage during injection molding

Chen¹,

Cieslinski²,

Baird³

2015

AIP Conference Proceedings

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Abstract. This work is concerned with the modeling of in-machine fiber breakage during injection molding. A lab-scale single screw extruder is used to evaluate fiber breakage in the screw. Our experiments show that as the initial glass fiber pellets length is reduced relative to the channel width, the overall percent of breakage is reduced. We believe that the ratio of initial pellet length to the screw channel width, or diameter, is an important parameter determining the percent of fiber breakage. Data have been fit using an exponential decay model with a kinetic decay constant and a critical length value. This empirical model has been tested on an injection molding machine with a screw 1.6 times larger than that of our single screw extruder. The predicted average fiber length leaving the nozzle shows reasonable agreement with the measured value. For the injection molded end-gated-plaque produced by the same machine, additional fiber breakage has been observed in the runner. A hydrodynamic force based breakage model is combined with mold filling simulation to simulate the fiber breakage in the runner. For carbon fibers, similar breakage trends were observed in the single screw extruder indicating the applicability of our empirical model to carbon fiber.

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“…Longer fiber length and better fiber dispersion are the key factors to obtain excellent mechanical properties of LFT. The instance is that longer fiber length is in favor of enhancing strength and toughness, and the improvement of fiber dispersion is beneficial to increase stiffness [3]. However, fiber length was reduced seriously by undergoing interaction between fiber-equipment, fiber-fiber, and fiber-matrix during extrusion compounding of LFT [4].…”

Section: Introductionmentioning

confidence: 90%

Relationship between fiber degradation and residence time distribution in the processing of long fiber reinforced thermoplastics

Zhuang¹,

Ren²,

Zong³

et al. 2008

Express Polym. Lett.

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Abstract. Long fiber reinforced thermoplastics (LFT) were processed by in-line compounding equipment with a modified single screw extruder. A pulse stimulus response technique using PET spheres as the tracer was adopted to obtain residence time distribution (RTD) of extrusion compounding. RTD curves were fitted by the model based on the supposition that extrusion compounding was the combination of plug flow and mixed flow. Characteristic parameters of RTD model including P the fraction of plug flow reactor (PFR) and d the fraction of dead volume of continuous stirred tank reactor (CSTR) were used to associate with fiber degradation presented by fiber length and dispersion. The effects of screw speed, mixing length and channel depth on RTD curves, and characteristic parameters of RTD models as well as their effects on the fiber degradation were investigated. The influence of shear force with different screw speeds and variable channel depth on fiber degradation was studied and the main impetus of fiber degradation was also presented. The optimal process for obtaining the balance of fiber length and dispersion was presented.

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A Study of Fibre Attrition in the Processing of Long Fibre Reinforced Thermoplastics

Cited by 88 publications

References 0 publications

Micromechanical parameters from macromechanical measurements on glass reinforced polypropylene

Micromechanical parameters from macromechanical measurements on glass reinforced polypropylene

Progress in modeling long glass and carbon fiber breakage during injection molding

Relationship between fiber degradation and residence time distribution in the processing of long fiber reinforced thermoplastics

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