Compression moulding fibre separation

Hojo, H., Kim, E. G., Yaguchi, H. and Onodera, T. (1988), Simulation of compression moulding with matrix-fibre separation and fiber orientation for long fibre-reinforced thermoplastics . International Polymer Processing, 3,54-61. 

Most tests will be made on standard test pieces which may be pieces cut from a component or a sheet, or they may have been moulded separately from the same material. Where test pieces or sheet are produced for the trials it is important that they are produced in as near as possible the same way as the product and that the processing conditions are recorded. Different results can be expected from compression and injection moulding or from extrusion (where a choice is possible). Directional properties can result from the conditions of flowing and cooling in a mould. For example, in a study at ERA, the creep strain of unfilled HDPE, either individually moulded or cut from square plaques, varies by up to a factor of two depending on the orientation of flow [40]. This difference becomes even more marked with short fibre reinforcement. 

A phase separation technique, using solvent and subsequent swelling, has been described to separate PVC from polyester fabric, primarily to recycle the fabric (340,355). A technique for recycling PVC coated glass fibre fabric has been described, based on compression or injection moulding, with addition of an acid absorber (hydrotalcite) (49). 

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