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Long glass fibre reinforcement of thermo plastics / S. F. Bush in INTERNATIONAL POLYMER PROCESSING, Vol. XIV, N° 3 (09/1999)
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Titre : Long glass fibre reinforcement of thermo plastics : Experimental and theoretical results for injection and blow moulding, Sheet and pipe extrusion Type de document : texte imprimé Auteurs : S. F. Bush, Auteur Année de publication : 1999 Article en page(s) : p. 282-290 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The paper summarises the main experimental and theoretical results from a long-term programme of research (SAFIRE) to produce and apply long glass fibre compounds to the extrusion of pipes, sheets and profiles and to injection, blow and roto moulding. The overall objective is to obtain the pro-cessing speeds associated with short fibre reinforced thermoplastics with the reinforcement efficiencies associ-ated with prepositioned or prepreg thermoset composites. Extrusion and injection moulding are now in the commercial domain, with industrial scale trials underway in the other technologies.
Long glass fibres are defined by their ability to form lace-like mat structures within the polymer melt which persist into the solid state. Such structures, which greatly increase both melt strength and solid state thermo mechanical properties, can be formed with fibre volume concentrations (c) as low as .01. The formation of mat structures depends on the number N of virtual touches per filament. A minimum of around five touches is generally needed. From earlier work N is given as A.c.l/d. A varies with mean fibre orientation in the mat: for the random in-plane case it is approximately 8/π2, so that in contrast with typical fibre suspensions (c≤d/l) extremely strong particle-particle interactions are involved in the melt state.
In the solid state, tensile strength is measured and modelled in terms of number average fibre length (l) and diameter (d), polymer yield strength, fibre distribution efficiency, interfacial shear strength and a specially defined matrix stress magnification factor M. The role of patented fibre management devices in optimising these variables as they appear in the solid state is defined and described.Note de contenu : - STRUCTURE OF LONG-FIBRE MATS
- OVERALL SAFIRE PROCESSES : Production of LGF granules - Fibres management devices
- FLOW SHAPING : Motion of a fibre with strong particle-particle interaction - Motion in a particular flow field - Shaping flows with static devices
- EVALUATION OF SHORT TERM TENSILE PROPERTIES AT ROOM TEMPERATURE : Sample preparation - Tensile properties and the matrix stress amplification factor MDOI : 10.3139/217.1544 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16139
in INTERNATIONAL POLYMER PROCESSING > Vol. XIV, N° 3 (09/1999) . - p. 282-290[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001009 - Périodique Bibliothèque principale Documentaires Disponible Morphological characterisation of long glass fibre composites for the thermoforming process / S. F. Bush in INTERNATIONAL POLYMER PROCESSING, Vol. XV, N° 2 (06/2000)
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Titre : Morphological characterisation of long glass fibre composites for the thermoforming process Type de document : texte imprimé Auteurs : S. F. Bush, Auteur ; F. G. Torres, Auteur Année de publication : 2000 Article en page(s) : p. 208-214 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Molding - This paper lays out the main procedures for performing morphological characterisations of Long Glass Fibre (LGF) composites with particular reference to the sheet extrusion and thermoforming processes as they may be configured for production. The techniques used, including optical microscopy, scanning electron microscopy and image analysis, are described both with regard to their laboratory application to these materials and to their potential for monitoring the performance of the industrial manufacturing process. Results obtained from the different techniques at the three various stages of the manufacturing route are presented and discussed in terms of the structure property relationships obtained and the reinforcing fibre mat system typical of these types of material. Note de contenu : EXPERIMENTAL TECHNIQUES : Optical microscopy (OM) - Scanning Electron Microscopy (SEM) - Image Analysis
- MATERIALS
- RESULTS AND DISCUSSION : Fibre-matrix-contact in the LGF granules - Reinforcing fibre mats - Fibre length distribution measurement - Fractography - Surface finishDOI : 10.3139/217.1589 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16064
in INTERNATIONAL POLYMER PROCESSING > Vol. XV, N° 2 (06/2000) . - p. 208-214[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001012 - Périodique Bibliothèque principale Documentaires Disponible