Gate design

Gate design Gate valves Gatorizing Gatorizing process Gatsch... 

The upgradient and downgradient surface areas of the aquifer material contacting the PRB will be approximately the same, minimizing disruption in the natural groundwater flow relative to current funnel-and-gate designs. 

Fig. 13.4 Typical gate designs and locations. [Reprinted by permission from I. Rubin, Injection Molding—Theory and Practice, Wiley, New York, 1972.]...

Beaumont, J. Runner and Gating Design Handbook Tools for Successful Injection Molding Hanser, 2004. 

Figure 6.50 Example of a gate design for transfer molding.

After the molten polymer has been stored in the pot and reached the required temperature, it is transferred into the mold cavity under positive pressure. The pressure and rate of transfer are the significant variables of the process. Critical shear rates at which the molten fluoropolymers exhibit unsteady flow are fairly low when compared to other pol5miers (Table 6.42). Critical shear rate increases with temperature as seen in Figs. 6.54-6.56 for three commercial grades of FEP, PFA, and ETFE. Careful gate design and transfer rate is necessary to keep the flow below the critical shear rates. 

Fig. D.9. (a) Inverter, (b) NAND gate, and (c) NOR gate designs using complementary transistor elements. Complementary devices can be fabricated using n and p-type OFETs, or by combining p-type OFETs with another material, such as amorphous silicon, which produces NFETs.

Like discovery-driven planning, stage-gate design places checkpoints in the development process for review of progress and outcomes. However, it only focuses on the pre-launch phase of the product life cycle, not the post-launch phase. Discovery-driven planning extends further into the product life cycle, covering both before and after launch periods of the product life cycle. 

Fig. 6.8. RIM fan-gate design. (Courtesy of W. Becker (1979). Reaction Injection Moulding, Van Nostrand Reinhold, New York).

Because most plated plastic parts are decorative rather than functional, appearance is extremely critical. For a smooth, even finish on a piece, the design of the part and molding process must be carefully considered. Mechanical welds are difficult to plate. If they are necessary, they should be hidden on a noncritical surface. Gates should be hidden on noncritical surfaces or should be disguised in a prominent feature. Gate design should minimize flow and stress lines, which may impair adhesion. 

Figure 1 Gate design for tensile bar mold (Gl) Double Gated (G2) Single Gated (G3) Fan Gate...

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