Plunger processing data

As previously stated, GRTP can be processed on either screw or plunger (ram) type machines. However, because reciprocating screw machines are preferred and generally used today, this paragraph and processing data and discussion presented in Table 4-1 are applicable to reciprocating screw machines. 

The first step is called presintering stage, which is carried out for 15 min with pulsed current, i.e., rectangular pulses of 100 A and duration 100 ms, 1 ON and 1 OFF operations, and constant mechanical load equal to 7 kN, which is about 10 MPa on top plunger and 38 MPa on bottom plungers, respectively. The second step then conducted for 1 h, with constant continuous current of 900 A, while mechanical load is kept unchanged. The whole process is modeled and compared with experimental results. In Figs. 5.13 and 5.14, the experimental data and... 

FIGURE 14.21 Schematic cross section of typical plunger (or ram or piston) injection-molding machine. (Data from U. S. 1. Chemicals/Quantum, Petrothene Polyolefins A Processing Guide, 5th edn., National Distillers and Chemical Corporation, New York, 1986.)... 

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