International Polymer Processing Volume 1 Issue 1

International Polymer Processing

Volume 1 Issue 1

Contents
Journal Overview

May 27, 2013 Page range: 1-1

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Original Contributions

Development of Planar Orientation in Polymer Processing

Masao Horio May 27, 2013 Page range: 4-11

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Abstract

A critical discussion is presented of the development of planar orientations in various polymer processing operations. These include tubular blown film and subsequently drawn and multiply stretched blown films. The response of polyethylene, various nylons, poly(ethylene terephthalate), cellulose and poly(p-phenylene terephthalamide) are discussed.

Orientation and Residual Stress Distributions in Thick Melt Spun Polystyrene and Polycarbonate Filaments

Ho Jong Kang, James L. White May 27, 2013 Page range: 12-18

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Abstract

A study of orientation development and residual stresses in thick melt spun polystyrene filaments and polycarbonate filaments described. Linear relationships between spinline stress and mean birefringence under different melt spinning conditions were obtained. These results were used together with models of the dynamics of melt spinning to predict the characteristics of thick melt spun filaments. Birefringence distrbutions and residual stresses were computed. High orientations and compressive circumferential residual stresses were predicted at the larger radii and low orientation and tensile circumferential and radial residual stress in the fiber core are obtained. The distribution of birefringence across the thickness of thick melt spun filaments was measured by determining changes of retardation across a wedge. The birefringence distributions were correlated with severity of quench and model prediction. Thick melt spun fibers were peeled and found to have fibrillar cores.

Experimental and Theoretical Approach to the Extrusion of Rubber Compounds with a Two-Stage Screw**

B. Vergnes, N. Bennani, C. Guichard May 27, 2013 Page range: 19-24

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Abstract

The extrusion of EPDM compounds with a two-stage vented screw has been studied. Experimentally, the pressures and temperatures were measured at the end of each stage, for different processing conditions (screw speed, die geometry etc.). Screw pulling experiments have allowed to observe the partially filling of the different screw sections. Assuming a power-law pseudoplastic behaviour for the rubber compound, the flow in each stage of the screw has been computed. The evolutions of the pressure and the temperature all along the screw, as well as the filling length of the second stage are then obtained. The theoretical results are in good agreement with the experimental measurements.

The Characteristic Behaviour of the Stretch-Orientation Zone during High-Speed PET Spinning**

Jialin Wu, Diaosheng Guan, Baojun Quian May 27, 2013 Page range: 25-30

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Abstract

A theory is proposed to separate the on-line stress in the stretch-orientation zone during high speed PET spinning into two parts: the thermodynamically equilibrium or quasi-equilibrium stress associated with rubber elasticity and the non-equilibrium driving stress, which leads to coordinated orientation of the macromolecular chains. Precise and simultaneous measurements of the online spinning parameters at five spinning speeds, ranging from 2200 to 4200 m/min, were conducted. A physical model consisting of a dashpot placed in parallel with a Gaussian network was found to describe well the behaviour of the stretch-orientation zone of high speed PET spinning.

Polymer Compounding Process for Controlled Peroxide-Degradation of PP

H.-G. Fritz, B. Stöhrer May 27, 2013 Page range: 31-41

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Abstract

A process control concept for peroxide-initiated degradation of polypropylene was presented. The link-up of a twin-screw extruder to an on-line Rheometer and a computer system using a newly developed program package can he used to form a process control system unaffected by external disturbing influences and leading to a long-term constant product quality. Work is still to be done concerning development and optimization in the area of layout and design of adapter systems and concerning the measures for lowering the controllability ratio Z 1 Special attention should be given to a processing concept to enable changes in M̅ w and MWD independently of one another.

The Modelling of Mold Filling in Resin Transfer Molding

R. Gauvin, M. Chibani May 27, 2013 Page range: 42-46

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Abstract

The resin transfer moulding process (RTM) allows the industrial production of large FRP parts. In this technique layers of reinforcements (mats, woven rovings) are inserted into the mold cavity and resin is injected to fill the closed mold applying external pressure. Due to the strong interdependence between mold design, filling behavior and part quality it is most important to control the cavity pressure as the major influencing process parameter. A simple model is proposed to represent the pressure distribution during mold filling. It is based on Darcy's law for flow of liquids through a porous media and can be applied to single type or combinations of different reinforcements.

About this journal

International Polymer Processing offers original research contributions, invited review papers and recent technological developments in processing thermoplastics, thermosets, elastomers and fibers as well as polymer reaction engineering. For more than 25 years International Polymer Processing, the journal of the Polymer Processing Society, provides strictly peer-reviewed, high-quality articles and rapid communications from the leading experts around the world.
All articles are subject to thorough, independent peer review.
Editor: Polymer Processing Society