Melt spinning of reactive extruded and/or blended polymer fibers by means of an online coupled twin screw extruder / R. Beyreuther in INTERNATIONAL POLYMER PROCESSING, Vol. XVIII, N° 1 (03/2003)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVIII, N° 1 (03/2003) . - p. 74-79 Titre : Melt spinning of reactive extruded and/or blended polymer fibers by means of an online coupled twin screw extruder Type de document : texte imprimé Auteurs : R. Beyreuther, Auteur ; B. Tändler, Auteur ; R. Vogel, Auteur ; M. Hoffmann, Auteur Année de publication : 2003 Article en page(s) : p. 74-79 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : After some general introductory remarks to the advantageous application of a twin screw extrusion to the melt spinning the lecture deals with investigations of elastomeric fibers consisting of ethylene-octene-copolymers which have been grafted by organosilanes and additionally blended with polybutylenterephthalates (PBT) and/or polyesterelastomers (PEE), all by means of a reactive twin screw extruder coupled with a side feeding single screw extruder in an online melt spinning process. It will be demonstrated that considerably improved mechanical properties of the elastomeric EO-fibers can be reached with this additional blend step. All spun fiber samples will be characterized regarding their structural and mechanical properties extensively. This work is a decisive expansion of our results published during the last two years regarding to the twin screw extrusion melt spinning [1 to 4]. DOI : 10.3139/217.1724 En ligne : https://drive.google.com/file/d/1YnVPOkI0SChNOG7SPdfcTMJL9WmP2r1J/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15852 [article]

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Preferable filament diameter ratios of hybrid yarn components for optimized longfiber reinforced thermoplastics / R. Beyreuther in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 2 (06/2002)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 2 (06/2002) . - p. 153-157 Titre : Preferable filament diameter ratios of hybrid yarn components for optimized longfiber reinforced thermoplastics Type de document : texte imprimé Auteurs : R. Beyreuther, Auteur ; Harald Brünig, Auteur ; R. Vogel, Auteur Année de publication : 2002 Article en page(s) : p. 153-157 Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The mechanical properties of hybrid (commingled) yarn based reinforced thermoplastics depend on many parameters of the fiber components as well as of the different technological conditions during the commingling and the hot press molding. Among the fiber parameters the diameter ratio of the matrix and the reinforcing yarn components are most important to obtain the best mechanical properties of the reinforced thermoplastics. The paper treats theoretical considerations in order to reach a high probability of coating each reinforcing filament with the thermoplastic material during the hot press molding. The calculations include the filament ratios and the achieved volume ratios of both hybrid yarn components of the finished reinforced thermoplastics. It is demonstrated the under different optimization criterias (same filament numbers for both components or the same surfaces of the reinforcing yarn filaments and the matrix yarn filaments before the hot press molding) a more or less small range of filament ratios seem to be valid for manufacturing a homogeneous faultless reinforced thermoplastic. Quantitative calculations for two hybrid yarn systems PEEK/carbon fibers and PP/glass fibers, presented in diagrams, are demonstrated. Technological conditions for the spinning of micro fibers like PEEK-filaments complete the presentation. Note de contenu : - Theoretical investigations concerning the diameter ratios - Melt spinning of microfiber like filaments DOI : 10.3139/217.1681 En ligne : https://drive.google.com/file/d/1oJ5tJPe_RPFD7bm5BN7eeig3Rhdh8Xio/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15944 [article]

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Rheological and theoretical estimation of the spinnability of polyolefines / R. Vogel in INTERNATIONAL POLYMER PROCESSING, Vol. XIV, N° 1 (03/1999)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XIV, N° 1 (03/1999) . - p. 69-74 Titre : Rheological and theoretical estimation of the spinnability of polyolefines : Part I : Rheological study Type de document : texte imprimé Auteurs : R. Vogel, Auteur ; Harald Brünig, Auteur ; R. Beyreuther, Auteur ; B. Tändler, Auteur ; D. Voigt, Auteur Année de publication : 1999 Article en page(s) : p. 69-74 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Fibers and films - Melt spinning is a polymer processing technique that makes great demands on the extensibility of the polymer melt in the distance between die exit and solidification point [1]. The polymer material is exposed to a rapidly growing deformation rate over a large range of deformation within a short time of about 100 milliseconds. Simultaneously an extreme cooling occurs with cooling rates of about 1000 K/s. For this reason only a few polymer materials are usable for this kind of polymer processing with sufficient take-up speeds. Most polymers show afiber break in the motten state either by brittle cohesive rupture or ductile failure when approaching critical conditions of deformation. The rheological behaviour of a polymer melt at the critical conditions of deformation in the fiber forming process can not be predicted by means of usual rheological material functions. This paper reports the attempt to find out material functions, which describe the critical deformation states of the melt spinning process. The established material functions are compared with the results of spinning experiments to estimate their practicality. DOI : 10.3139/217.1518 En ligne : https://drive.google.com/file/d/1NHp5HYl1M0Ym8rPxPuT4r80dARmOnGr-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16114 [article]

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Tensile force measurements in the PA 6 high speed fiber spinning and their utility / R. Beyreuther in INTERNATIONAL POLYMER PROCESSING, Vol. XIV, N° 4 (12/1999)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XIV, N° 4 (12/1999) . - p. 326-330 Titre : Tensile force measurements in the PA 6 high speed fiber spinning and their utility Type de document : texte imprimé Auteurs : R. Beyreuther, Auteur ; Harald Brünig, Auteur ; H. Hofmann, Auteur Année de publication : 1999 Article en page(s) : p. 326-330 Note générale : Nomenclature - Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Fibers and films - The paper deals with practical and theoretical investigations of the PA 6 high speed fiber spinning process in the velocity range from 3000 until 5450 m/min by means of tensile force measurements in the spinning line below the fiber solidification point. The measurements were evaluated under three different goals as follows: Quantitative determination and interpretation of relations between the technological and textile-physical fiber parameters spinning speed, throughput, and fiber fineness (in the range of 4.1 to 14.8 dtex for a single filament spun from a 9-holes die). Comparison between the experimentally measured and the theoretically calculated tensile forces by means of the own fiber formation model developed in the last years. On this occasion a satisfactory concordance could be noticed between the experimental and theoretical results. In addition to this a good model parameter estimation could be proved in the force balance part of the differential equation system for the fiber formation. Spectral analytical evaluations of the measured tensile force time functions by means of their autocorrelation functions. It could be demonstrated, that higher frequency tensile force disturbances could be caused both by the spinning pump and by unevennesses in the cross quench air conditions below the spinning die. All results from the investigations above are discussed in relation to different technological process goals and their realization possibilities. Note de contenu : - Introductory remarks, goals of the experiments - Brief theoretical explanations - Tensile force measurements - Spectral analytical evaluations of tensile force time functions DOI : 10.3139/217.1558 En ligne : https://drive.google.com/file/d/1Q8uqGrAquUHFnycnZjhKUpkOHqDzocoz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16120 [article]

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