MuCell process

Based on microcellular thermoplastic foam technology, the MuCell process uses a blowing agent (typically CO2) that in a supercritical state creates foams with evenly distributed and uniformly sized microscopic cells, 5-50 qm for example. This foam... 

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.

Figure 11.4 Cavity pressure plots (9) for the same part molded in solid PA6 with 30% glass fiber and also with microcellular (MuCell) process. Pressure transducer was located behind ejector pin near the gate.

Figure 11.6 Peak temperature profiles at gate and near end of fill for three sets of MuCell process conditions. The time to peak temperature changes with process conditions and should provide a reliable trigger for switchover from velocity control to pressure controlled hold time.

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. 

MuCell A process for making foamed plastics by the use of supercritical fluids during plastics processing. Developed by Trexel, Germany, and licensed to Ticona. 

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... 

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