Scorim Process

Scorim Process or SP (Cinpres-Scorim), Rheomolding Process or RP (Thermold s), and the Press Alpha Process or PAP (Sumitomo Heavy Industries and Sankyo Chemical Engineering of Japan) processes are examples of this method. The SP multi-live feed molding process where two packing pistons oscillate 180° out of phase and eliminate weld lines, etc. The RP system provides 3-D orientation based on the concept of melt rheology as a function of vibration frequency and amplitude as well as temperature and pressure. The equipment utilizes piston/type melt accumulators set up adjacent to the melt stream of the plasticator. Piston oscillates back and forth. The PAP system uses compression pins that are... 

The SCORIM Process. It is possible to attach the SCORIM unit to the injection molder to manipulate the filling process of the mold so that in the area of the weld lines the resin is mixed [16]. This will improve the structural strength substantially and at the same time the unwanted orientation of metallic pigments is prevented. This process typically requires a 10-15°C higher temperature of the resin and the mold. The process is based on a prolonged flow ability of the polymer. 

The SCORIM process employs a unique hardware component that is retrofitted to a conventional injection molding machine. Located between the injection nozzle and the mold, this unit contains a pair of pistons that exert pressure on the melt after it is injected... 

An additional benefit to the SCORIM process is the obliteration of weld lines. Weld lines occur wherever two flow fronts mteet one another. For example, when molding a part that will contain a hole, the mold includes an obstruction around which melt flows. As a result, the flow front splits to travel around the obstruction and then rejoins on the other side, forming a weld line. Weld lines can be problematic for two reasons aesthetics and structural integrity. The presence of a weld... 

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. 

Scorim process See injection-molding melt-flow oscillation. 

Various processes are reported to provide a means to pulsate the melt to improve performance of the extruded product. An example is the Scorim process reviewed in the Injection Molding section in this chapter. A variation in the IM process has been applied to production of reinforced extruded TP pipe. This has been a center of interest, on the argument that a predictable orientation of fiber would considerably increase the pressure resistance of the pipe, without the need to increase wall-thickness (on the analogy of winding a TS resin pipe with continuous filament). The Scorim process combines the extrusion of a fiber-reinforced compound with pressure pulsing around the periphery of the die, which appears to have the effect of orientating the reinforcement. 

Figure 1 A schematic diagram showing the operatic modes of the SCORIM process (a) mode A, the pistons are activated 180° out of phase (b) mode B, the pistons are activated in phase (c) mode C, the pistons are held down under a constant static pressure.

Figure 23.7. Variation of miorohardness along the sample diameter for SCORIM-processed Vestolen A 6016, Hostalen GM 9255 F, and Stamylan HD8621 moldings as calculated from both indentation diagonals after application of load (0) parallel and ( ) perpendicular to the main direction of flow (MDF)...

Figure 23.8 (a) Typical tensile fracture surface of SCORIM-processed HDPE and (b) respective detail... 

Figure 23.9. PLM photographs of the longitudinal cross-section of SCORIM-processed HDPE (a) overview (b) central core (c) transition layer (d) skin...

Figure 23.10. WAXD patterns for SCORIM-processed moldings...

Table 5.2 The flexural modulus, maximum stress, energy at break and hot recoverable strain of the CIM and SCORIM processed PLLA...

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