Direct compounding injection molding

CU control unit DCIM direct compounding injection molding... 

Figure 7.31 Improvement in product properties by a direct molding system. Impact kgfcm/cm Flex. Modulus kgf/cm2 DI Direct feeding in injection molding machine Comp. Conventional compounding system D.M. Direct compounding and molding system...

During the shaft seal molding process, the elastomeric compound has relatively large distances to travel/ flow in the mold, particularly when using shelf loaded compression molding (Fig. 17a) and injection molding (Fig. 17b). History has shown that without the use of a vacuum, either applied directly through the mold or... 

The Pushtrusion direct inline process for molding small to large products is accomplished by compounding and injection molding (IM) in a single operation long and/or short fibers from continuous fiber reinforcements. Details are reviewed in Chapter 5 Injection Molding. 

For example, in direct injection molding of lid-like, thin-walled structural components (e.g., headlight reflectors), pronounced circular orientations of the short glass fibers are observed in the BMC (bulk molding compound) UP resins around the sprue gate. The solution is usually ICM or push-pull injection molding. 

For this reason, most injection molding machines for thermoplastics are equipped with screws, that can move in the axial direction. However, there are also other designs. The conveyance of the compound in the direction of the nozzle causes the material to collect in front of the screw tip (ante-chamber). As this happens, the screw is forced backward. As soon as the screw has traveled a certain predetermined distance and the desired amount of melt has aceumulated in front of the screw, the rotational movement of the screw ceases and no further material is processed. 

An amorphous thermoplastic derived from the direct reaction between aromatic and aliphatic dihydroxy compounds with phosgene or by the ester exchange reaction with appropriate phosgene-derived precursors. Highest impact resistance of any transparent plastic. It is transparent and can be injection molded, extruded, thermoformed, or blow molded (esp. branched PC). 

Diline, Direct injection molding foam compound, AT Plastics Inc., AT Polymers Div. 

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