Comparison among Various Processing Methods

The processing of plastics is based on three major operations  

In the case of thermosets, the product may be ejected while hot and, eventually, cooled at ambient temperature. 

Production Cost Cost Output Time Temperature Pressure 

When different processes are compared, economics is of vital importance in determining feasibility. Currently, the requirement to reduce energy consumption is most important. Table 5-1 provides data for comparison. 

In injection molding it was found that the product as obtained is too short. Suggest three possible solutions. What are the limitations  

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A somewhat slow but controllable impregnation method with the dipping of support into an excess of aqueous solution of (NH4)3[Fe(C204)3].xH20 is adopted to prepare well-dispersed or monolayer-type ferric oxide on various supports. Other methods with the same and other conditions are also used to make a comparison among them. The influences on the adsorption process are investigated and the suitable conditions are determined for the different supported systems. Extensive characterization has been done on the physico-chemical properties of these systems. The catalytic performances for different test reactions are also carri out on the various supported systems with distinctly different dispersions. 

This review has illustrated various applications of fractal concepts to the description of adsorption/desorption processes on environmental materials. The surface fractal dimension A can be determined by several independent methods, among which those based on adsorption measurements are shown to be the most convenient and straightforward. However, a comparison of fractal dimensions calculated from different approaches was shown to be problematic therefore, the need for further studies in this field is evident. 

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