By Prof.Dr.-Ing. habil. Roland Beyreuther, Dr. rer. nat. Harald Brünig (auth.)
The e-book bargains with the modelling of regular country and non-steady country easy tactics of fibre formation and fibre processing. Focal issues are soften spinning tactics (polymers and glass, drawing, spunbonded nonwoven), spun yarn spinning procedures (drafting, carding) and the outline of the dynamics in several strategy steps in the course of the fibre processing (fibre delivery, fibre heating and cooling, fake twist texturing). a unique bankruptcy bargains with dynamics of tensile strength (measuring and overview percentages) and its value for the method balance. All provided examples are in line with business perform and provides the reader an immediate 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 booklet could be of certain 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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Extra info for Dynamics of Fibre Formation and Processing: Modelling and Application in Fibre and Textile Industry
Momentum Balance The momentum balance equation can be integrated in order to determine the forces acting on the ﬁbre. In this manner, the forces play an essential role in structure development: the resulting ﬁbre stress σ (that is ﬁbre force F divided by ﬁbre cross-sectional area A) leads to the deformation of the polymer and at least determines the orientational status and the structural arrangement of the polymeric chains. 4 shows how the forces act on the ﬁbre and how they contribute to the total ﬁbre force.
Heat radiation strongly depends upon the temperature (power law with T 4 dependence – Stephan-Boltzmann law). Radiation plays an important role for glass or metal spinning processes where the temperature can reach 1200 or more. But in melt spinning of thermoplastics with spinning temperatures of up to 300 the contribution of radiation is, consequently, often neglected. Heat conduction occurs as inner conduction inside the ﬁbres and also as outer conduction in such cases where ﬁbres are brought into contact with other materials of diﬀerent temperature, like ﬁbre guides, metal plates or godets.
That model which starts from the setting up of the DEq. taking all qualitative physical-analytical relationships into consideration and in which only the quantitative ﬁxing of the DEqs. parameters is tested experimentally, must be seen as the most valuable model. All dynamic characteristic functions, for instance the step response function or the complex frequency response, can be calculated if the DEq. of the process or process part behaviour is known. As soon as the setting up of the DEq. becomes impossible, the questions of interest have to be exclusively solved by experiments.
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.)