Shear-controlled orientation injection

Medina, E.M.G. (1996) Alignment and management of talc platelets in polypropylene matrix by the application of shear controlled orientation injection moulding (SCORIM) technology. PhD thesis, Brunei University, UK... 

Shear controlled orientation injection molding (SCORIM) is a novel technique for establishing the alignment of polymer molecules and fiber reinforcements in molded p arts. S olid-state properties, which are highly dependent on molecnlar and additive alignment, can be improved through the use of controlled orientation. 

FIGURE 14-52 Schematic diagram of shear controlled orientation injection molding. 

Figure 6 (a) Shear controlled orientation injection moulding (SCORIM). (b) Klockner puch-puir injection moulding... 

Modified processing techniques have been useful for thermoplastic starch polymers. Recent work [45, 46] has examined the use of coextruded sheet processing to produce polyester / thermoplastic wheat starch / polyester multilayer films. They found that adhesion strength between the layers and stability of the interface were crucial properties in controlling the final performance properties of the films. Work by Sousa [47] has examined use of the novel shear controlled orientation injection molding (SCORIM) process to control morpholoiges and provide tensile property increases of thermoplastic starch/synthetic blends. 

When the PP is subjected to shear-controlled orientation injection molding (SCORIM), the molecular orientation may be enhanced, resulting in a self-reinforced molding. For example, by the SCORIM method, moldings of improved stiffness (by 75%) can be obtained [3] - see the related chapter in this book. 

Single Polymer Composites via Shear Controlled Orientation Injection Molding (SCORIM) or Oscillating Packing Injection Molding (OPIM) Techniques... 

In injection-moulded polypropylene products, densely packed row stmctures are typically found near the surface of the object. At least one process has been developed which is able to deliver this morphology throughout the moulded object, namely shear-controlled orientation injection moulding (SCORIM) (Kalay and Bevis 1997). 

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