By Prof.Dr.-Ing. habil. Roland Beyreuther, Dr. rer. nat. Harald Brünig (auth.)
The booklet bargains with the modelling of regular nation and non-steady country easy methods of fibre formation and fibre processing. Focal issues are soften spinning procedures (polymers and glass, drawing, spunbonded nonwoven), spun yarn spinning procedures (drafting, carding) and the outline of the dynamics in several method steps in the course of the fibre processing (fibre delivery, fibre heating and cooling, fake twist texturing). a unique bankruptcy offers with dynamics of tensile strength (measuring and assessment chances) and its significance for the method balance. All offered examples are according to commercial perform and provides the reader a right away mind's eye of the mentioned difficulties. the consequences are defined in a userfriendly means and provides the practitioner the prospect to optimize his or her personal processing. The publication may be of exact curiosity to researchers, and engineers, within the man-made fibre and fabric in addition to to lecturers and scholars of the proper graduated and undergraduated classes in cloth engineering and polymer physics together with the accent mechanical engineering.
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Additional resources for Dynamics of Fibre Formation and Processing: Modelling and Application in Fibre and Textile Industry
13) where σsurf is the surface tension (or speciﬁc surface energy) of the material. The contribution of the surface tension force to the total force is usually low, except for very low viscous materials. 1 Steady State Single Fibre Formation Process 51 x=0 F0 Finert Frheo(x) Fdrag Fsurf x Fgrav F(x) x=L FL Fig. 4. 02 mN. 81 m/s2 ), and A denotes the ﬁlament cross-sectional area. 01 mN, which is also the order of magnitude of the contribution of Fgrav . The inertial force Finert is caused by acceleration of the polymeric material from the initial velocity v0 at the exit point of the spinneret to the velocity v(x) at any distance x, at least to the ﬁnal take-up velocity vL .
26 for step-like excitations of the system by the independent cause variable. 33 is identical with Eq. 9 of Sect. 2 but includes the more detailed symbols for the several mean values and ﬂuctuations. Before the interpretation of Eq. 33 it is shown, how the complex frequency response can be derived from the DEq. 26. As explained in one of the former sections the complex frequency response represents the DEqs. steady state solution for sinusoidal excitations. 35) where ω is the excitation frequency and ϕ is the phase shift angle.
The development of stress and temperature and the structural changes determine the physical and textile properties such as orientation, crystallinity, elongation at break, tenacity and many others. Modelling the dynamics of ﬁbre formation should lead to a suﬃcient description of the resulting variables and their correlations to the ﬁbre properties. The main goal is helping to understand the inﬂuence of primary variables (material properties and technological process parameters) on the resulting product properties.
Dynamics of Fibre Formation and Processing: Modelling and Application in Fibre and Textile Industry by Prof.Dr.-Ing. habil. Roland Beyreuther, Dr. rer. nat. Harald Brünig (auth.)