Read e-book online Specialized Molding Techniques: Application, Design, PDF

By Hans-Peter Heim, H. Potente

A surge of recent molding applied sciences is reworking plastics processing and fabric types to the hugely effective, built-in production that might set criteria within the early years of this century. This publication is a survey of those applied sciences, placing them into context and accentuating possibilities. The family members between those applied sciences are analyzed when it comes to items, fabrics, processing, and geometry.

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The gas flows from the gas pin in direction to the high center rib and the gas flow is diverted into 6 different directions following the gas-channel network of the part. The gas flow is split up is more 48 Special Molding Techniques Figure 6. Screw boss areas with rib pattern for creating a mounting plane. often diverted flowing towards the last filled areas of the part as shown in Figure 7 b). The Figure 7. Gas distribution from the gas injection point following the gas-channel network. more flow paths are provided for the gas, the more problem areas can occur on the molded part.

To compensate for slight fluctuations in the injection stage with polymer it is very important to ensure the same conditions for the subsequent gas injection via gas pin. Changes in the short shot sequence can create a narrow processing window for the gas-assisted injection molding process and under certain circumstances it results in a borderline running process. Due to the lower flow resistance there is a significant foreflow visible in areas where gas-channels are running along ribs or across surfaces.

The issue of the relative importance of the gas bubble velocity in comparison to the thermal influences in the mold cavity may be addressed through plots of Fourier number vs. fractional coverage. The Fourier number, Fo, is defined as: Fo = α tr / Rt2 where α is the thermal diffusivity, tr is the residual time, and Rt is the tube radius. Figures 7 and 8 show the dependence of the wall thickness on the Fourier number. 1 1 Figure 7. Depende nce of wall thickn ess on Fou r ier nu mber u sing polycarb ona te.

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