Extrusion Dies for Plastics and Rubber 3E: 'Design and by Walter Michaeli

By Walter Michaeli

This accomplished e-book describes the complete variety of dies used for the extrusion of plastics and rubber and the advancements and recommendations within the box of extrusion and die layout. suggestion at the configuration of dies is given, and the probabilities and obstacles of computer-aided layout are tested. This particular, but simplified strategy presents day-by-day aid for plastics engineers and gives a fantastic beginning for these education during this box. Partial Contents: houses of Polymeric Melts. basic Equations for easy Flows. Computations of speed and Temperature Distributions in Extrusion Dies. Monoextrusion Dies for Thermoplastics. Coextrusion Dies for Thermoplastics. Extrusion Dies for Elastomers. Heating of Extrusion Dies

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The following relation results: F =B L t ( x = " ^ = A z P b " . 40) is independent of the material law. Case B : Pseudoplastic Flow following the Power Law. 31), we obtain: ι ( ? com by Universitätsbibliothek Bayreuth on February 21, 2012 For personal use only. 58 [References p. 74] 3 Fundamental Equations for Simple Flows -m = 1 m =3 "m=6 Fig. 39), we obtain: Φ v z V,= v x max = z( = °) = (Ap m+l \ m+l Φ L Hi m+l £)(! 47) This ratio for the Newtonian behavior (m = 1) is also 2 / 3 as found previously.

2 Thermodynamic Behavior [References p. 47] P E 7 ^ = / Specific volume ν - L D PE-HD X'^j- 1,0 . 2 Fig. com by Universitätsbibliothek Bayreuth on February 21, 2012 For personal use only. 12 43 - 7500- ^ — Pressure 1 1 1 1 50 100 150 200 Temperature Τ ρ • 1 250 °C 300 Fig. 26 p-v-T diagram of PE 44 [References p. 43) α ρ(Τη) ρ(Τ) linear coefficient of thermal expansion density at the reference temperature To density at temperature T. e. under or over T for amorphous polymers or under or over T for semi-crystalline polymers.

Com by Universitätsbibliothek Bayreuth on February 21, 2012 For personal use only. 7) results strictly from the balance of forces; no assumptions were made as to the material law. 7) is independent of the behavior of the material. 7) The negative sign means that v in the direction of r decreases. 10) we obtain: Apr dv = - ^ - - d r . 12) The maximum velocity is at r = 0. 13) • For the mean velocity v : z v z = ν ~^J ζ^Α with dA = r- dr. 13) shows that the mean velocity is equal to half of the maximum velocity: 54 [References p.

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