Pressurization and pumping

2 Synthesis of Pumping Machines from Basic Principles, 237 

4 Knife and Roll Coating, Calenders, and Roll Mills, 259 

The polymeric melt generated by the melting step must be conveyed and pressurized or pumped by the processing machine to force it through dies, or into molds, to assume useful shapes. This is the subject matter of this chapter. 

Principles of Polymer Processing, Second Edition, by Zehev Tadmor and Costas G. Gogos. Copyright 2006 John Wiley Sons, Inc. 

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Many chemical plants, particularly distillation columns, operate at low pressures, and pumps are required to create and maintain the vacuum. Vacuum pumps take in gas at a... 

Figure 8. Separation testing of He and H2 using met glass. Note that the He signal does not change about background when it is present while the hydrogen signal, total system pressure and pump pressure all increase when H2 + He are introduced.

A hot water dynamic extraction device was constructed using the solubilization apparatus of Miller and Hawthorne (10) as a model and was used for pressurized extraction of milk thistle seed meal. Figure 2 shows a schematic diagram of the apparatus. Water, the extraction solvent, was pressurized and pumped using a Bio-Rad 2800 HPLC solvent delivery system (Hercules, C A) to an extraction cell housed in the oven of a Hewlett-Packard 5890 gas chromatography (GC) oven (Wilmington, DE). Before... 

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