Mucell injection molding

PPS foams have been prepared by Mucell injection molding [96]. The cell size of the microcellular PPS foams increases with the length of flow passage of injection mold. 

Liu T, Liu H, Li L, Wang X, Lu A, Luo S. Microstructure and properties of microcellu-lar poly(phenylene sulfide) foams by mucell injection molding. Polym Plast Technol Eng 2013 52(5) 440-5. 

With the MuCell injection molding process, the SCF is dosed during screw recovery (rotation in preparation of the next shot). The SCF is delivered from one of several types of systems. The original and most commonly used system brings the gas pressure up to SCF pressure levels by utilizing two pumps. TTie SCF is then delivered to the barrel through an... 

Many industrial firms worldwide are now making microcellular products through extrusion and injection molding (imder license from Trexel, Inc.). Trexel, as the sole licensee of MITs has developed the MIT technology further for commercial applications. The trade name is MuCell. It is very likely that the number of new applications that use the microcellular technology will continue to increase at a rapid rate in the years to come. 

In response, microcellular injection molding was developed[3] and commercialized by Trexel Co. Ltd. as the Mucell process. The key insight of this process is the application of a supercritical fluid. The supercritical fluid is injected during the injection stage cycle, creating millions of micron-sized voids in otherwise solid thermoplastic polymer parts. 

The injection-molding machine used was the Arburg 420C Allrounder 1000-350, equipped with Mucell capability. Nitrogen is used as the gas source. In this study. 

Figure 11.1 Core-back technology, which combines MuCell process with a secondary expansion process. SCF laden plastic is injected with high pressure and minimal initial cell growth. The mold volume is then rapidly increased to initiate uniform cell growth.

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