Rheological characterisation of discrete long glass fibre (LGF) reinforced thermoplastics

Bush, Stephen F.; Torres, Fernando G.; Methven, J.M.

doi:10.1016/s1359-835x(00)00089-0

Cited by 24 publications

(13 citation statements)

References 7 publications

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“…Variothermal temperature control is well known for different applications in injection moulding in order to increase surface quality, flowability and to reduce flow lines [11,12,13]. To dynamically control the temperature of the compression mould additively manufactured cavity inserts with a three-dimensional network (Figure 1 (a)) of heating and cooling channels arranged directly behind the cavity surface are used.…”

Section: Approach -Variothermal Temperature Controlmentioning

confidence: 99%

“…Fibre imprints and freezing effects occur on the component's surface, which means that these components are not suitable in visual applications. Due to the necessary fluidity of the LFT compound in the mould, the fibre content and fibre length and thus the mechanical properties of the component are limited [11]. The low mould temperature leads to a significant increase in material viscosity and the required compression force during processing.…”

Section: Introductionmentioning

confidence: 99%

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Compression moulding of LFT components with increased quality by variothermal mould technology

Hopmann

Beste

Boettcher

et al. 2017

AIP Conference Proceedings

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A validation of the fibre orientation and fibre length attrition prediction for long fibrereinforced thermoplastics AIP Conference Proceedings 1664, 050008 (2015) Corresponding author: arne.boettcher@ikv.rwth-aachen.deAbstract. For the production of composite components made of long-fibre reinforced thermoplastics (LFT) the economic compression moulding process is well established. However, the low temperature of the compression mould during processing leads to a significant increase in both the material viscosity and in the compression force in particular for thinwalled components. In addition, low surface qualities result which prevent the application of such components in visible areas. To overcome these disadvantages, a variothermal compression moulding process has been developed at the Institute of Plastics Processing (IKV) at RWTH Aachen University. With the variothermal mould technology a reduction of the viscosity of the moulding compound during processing is achieved. This results in a reduction of compression force by about 60 %. Additionally, moulding compounds with higher fibre contents (up to 60 % by weight) can be processed and the surface quality of LFT compression moulding components can be significantly increased for the application in visible areas. This paper describes the functionality of the variothermal mould technology and its efficiency for the process of LFT compression moulding. Results of investigations regarding the influence of the mould temperature on the process properties and the component properties are presented and discussed.

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Section: Approach -Variothermal Temperature Controlmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Compression moulding of LFT components with increased quality by variothermal mould technology

Hopmann

Beste

Boettcher

et al. 2017

AIP Conference Proceedings

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“…LFTs are discontinuous fiber composites that have fiber lengths between 7 and 25 mm depending on the fiber, the matrix and the type of sizing (if any) [4,5]. LFTs are typically made of a low cost thermoplastic polymer like PP, PA, PE, and polycarbonate (PC).…”

Section: Materials Consideration: Homopolymers Versus Lftmentioning

confidence: 99%

Design and analysis of a long fiber thermoplastic composite tailcone for a tank gun training round

et al. 2008

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“…The use of reinforced thermoplastic materials is increasingly widespread in several sectors of industrial production thanks to the possibility of using conventional injection moulding techniques without major changes [1][2][3][4][5][6]. This is especially true when the reinforcement consists of short fibres, while in case of long fibres reinforcement there are some issues to be considered.…”

Section: Introductionmentioning

confidence: 99%

“…This is especially true when the reinforcement consists of short fibres, while in case of long fibres reinforcement there are some issues to be considered. The main one among these is the reduction in fibres length during processing caused by the development of complex interaction phenomena [3][4][5][6]. Improvements of mechanical properties related to the use of long fibres reinforcement, in particular the increase in stiffness and strength, justify the efforts expended in seeking the relationships between fibres and process parameters.…”

Section: Introductionmentioning

confidence: 99%

A New Procedure for the Analysis of Fibre Breakage After Processing of Fibre-Reinforced Thermoplastics

2010

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During the processing of fibre-reinforced thermoplastics, such as in extrusion and injection moulding, fibre breakage takes place and the average fibre length is reduced. This reduction in length might result in a loss of reinforcement efficiency because the mechanical properties of the composite strongly depend on residual fibre length. For this reason an accurate measure of the fibre length obtained at different process conditions is necessary to relate it with the process parameters. The most used method for determining a fibre length distribution is performed measuring the fibre length by image analysis from micrographs. In the case of thermoplastics reinforced with long fibres, the inability to measure the longer fibres may lead to an underestimation of the average fibre length and thus the correlation between the process parameters and the fibre damage is impaired. In this paper a new procedure is proposed, based on template matching and image mosaic, allowing the measure of fibres of any size. Furthermore this technique allows a researcher to consider all the fibre contained within the specimen. The results obtained with this new procedure is a more accurate estimation of the average fibre length and its distribution even with fibres longer than the available sizes of the micrographs.

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Rheological characterisation of discrete long glass fibre (LGF) reinforced thermoplastics

Cited by 24 publications

References 7 publications

Compression moulding of LFT components with increased quality by variothermal mould technology

Compression moulding of LFT components with increased quality by variothermal mould technology

Design and analysis of a long fiber thermoplastic composite tailcone for a tank gun training round

A New Procedure for the Analysis of Fibre Breakage After Processing of Fibre-Reinforced Thermoplastics

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