First Part: Phenomenological analysis
The present two papers have been delivered in the International Meeting on ‘Experimental Methods in Mechanics” held at the International Centre for mechanical sciences — Udine (Italy) on 24–29 October 1974.
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GIOVANNI MANFRE' TECHNION SPA NOVARA (ITALY)
LIMIT OF THE SPINNING PROCESS IN MANUFACTURING SYNTHETIC FIBERS
COURSE HELD AT THE DEPARTMENT OF GENERAL MECHANICS
UDINE 1975
SPRINGER-VERLAG WIEN GMBH
This worlt is subject to copyright. AU rights are reseiVed, whether the whole or part of the material is concerned specifically those of translation, reprinting, re-use of illustrations, broadcasting, reproduction by photocopying machine or similar means, and storage in data banks.
©
1972; by Springer-VerlagWien
Originally published by Springer-Verlag Wien-New York in 1972,
ISBN 978-3-211-81308-9 DOI 10.1007/978-3-7091-2440-6
ISBN 978-3-7091-2440-6 (eBook)
This text has been submitted "ready for camera" by Professor Manfre and has been reproduced without any corrections or additions, except for the page numbering and the table of contents.
for CISM Prof. Giuseppe Longo Responsible for the Editorial Board
LIMIT OF THE SPINNING PROCESS IN MANUFACTURING SYNTHETIC FIBERS
First Part Second Part
Dr. Giovanni
Phenomenological analysis Experimental and quantitative analysis
Manfr~
- R & D Division TECHNION SpA - Novara (Italy)
The present two papers have been delivered in the International Meeting on 'Experimental Methods in Mechanics" held at the International Centre for mechanical sciences - Udine (Italy) on 24-29 October 1974. Both papers approach the spinning of synthetic fibers in order to help the production engineers to face the process rationalization especially in regards to the limits of rate of flow per nozzle of the spinneret.
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Synopsis The present work deals with the production limits of the spinning process which concerns the manufacture of organic and inorganic fibers included the metals. The main purpose of the work is to give the technical information necessary to help the production engineers in the rationalization and optimization of the spinning process. The work is divided in several parts and this paper treats mainly the production limits both in the region of extrusion and drawing zone downwards the bushing. For the sake of clarity this topic has been divided in two papers. The present paper intends to be a phenomenological treatment and it will be followed by the next which will deal the same matters
from the experimental and calculation point of
view. The production limits are mainly intended a limitation of the rate of flow per one nozzle. The limits in the Qushing region are essentially due to three phenomena: - die swelling - capillarity - melt fracture The die swelling limits mainly the geometry of the nczzle and the
stretchin~
spinning ratio, the capillarity limits the
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upper temperature of the process and the melt fracture limits the upper rate of flow. The three phenomena, treated from the rheological point of view, need to be investigated with a basical knowledge of the involved elastic parameters in addition to the more known viscous features of the spun materials. This implies to find relationship between the
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