Dynamics of hot-tube spinning from crystallizing polymer melts |
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| Institution: | 1. Graduate School of Science and Technology, Meijo University, Nagoya 468-8502, Japan;2. National Institute of Advanced Industrial Science and Technology (AIST), Nagoya 463-8560, Japan;1. NCSA, University of Illinois at Urbana–Champaign, 1205 W. Clark St., Urbana, IL 61801, USA;2. CFTP, Departamento de Física, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal;3. Institute of Systems and Robotics, Department of Electrical and Computer Engineering, University of Coimbra, Polo 2 - Pinhal de Marrocos, 3030-290 Coimbra, Portugal;4. IFPA, Dép. AGO, Quartier Agora, 19A Allée du 6 août, Bât B5a, Université de Liège, 4000 Liège, Belgique;1. Institut für theoretische Physik, ETH Zürich, Wolfgang-Paulistr. 27, CH-8093, Switzerland;2. Institute for Particle Physics Phenomenology, University of Durham, Durham, DH1 3LE, United Kingdom;1. Lomonosov Moscow State University, Vorobyov’s Hills, 119991 Moscow, Russia;2. Institut für Werkstofftechnik, Badgasteiner Str. 3, 28359 Bremen, Germany;1. Basque Center for Applied Mathematics (BCAM), Alameda de Mazarredo, 14 48009 Bilbao, Bizkaia, Spain;2. Department of Physical Chemistry, University of the Basque Country, Leioa, 48940, Spain;3. IKERBASQUE, Basque Foundation for Science, E-48011 Bilbao, Spain |
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| Abstract: | Computer modeling is applied to discuss hot-tube effects in melt spinning from crystallizing polymers. The set of spinning equations used in the model accounts for stress-induced crystallization, crystallinity-dependent melt viscosity and heat of crystallization. Example computations are performed for polyethylene terephthalate assuming temperature-dependent Newtonian viscosity, strongly modified by crystallization. The consequence of coupling of stress-induced crystallization and crystallinity-controlled solidification is limited range of spinning speeds, and multiple solutions of the dynamic equations of spinning. The range of admissible spinning speeds and multiple (amorphous and crystalline) solutions is strongly affected by the hot-tube temperature.It is predicted that zone heating, with temperatures above glass transition (hot tube), results in considerable increase of amorphous orientation factor for moderate take-up speeds. In the high speed spinning range, the orientation effects saturate and does not exceed the values predicted for high-speed room-temperature spinning. Application of the hot tube is also predicted to reduce considerably take-up stress.Available experimental data on amorphous orientation in PET fibers spun by hot-tube technique are in qualitative agreement with the model predictions. |
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