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Process Variables-21

Elsevier Inc.
DOI: 10.1016/b978-081551535-7.50022-7


Publisher Summary This chapter discusses the process variable related to the manufacturing polymer webs including drum surface roughness, polymer surface roughness, material properties, deposition rate, and water content of polymer. The drum surface roughness determines the number of contact points per unit area. The greater the number of contact points, the greater the heat transfer. The thicker the polymer, the greater is the thermal capacity. This can mean that for very thin coatings, the rate of cooling may be less important. The deposition rate and the winding speed are often linked. For a coating of the same thickness but different winding speeds, the heat load per unit time will change. In addition, the residence time in the deposition zone will be different; hence the total load from the radiant heat source and the peak temperature will be different. There are polymers that do not absorb moisture and these have a lower heat transfer coefficient than those that do. It is found that the amount of water they contain will be dependent upon the history of manufacture.

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