Method for optimizing of evaporation drying of paper, runnabilit

Details Method for optimizing of evaporation drying of paper, runnabilit Method for optimizing of evaporation drying of paper, runnabilit

1998-04-22

1999-12-21

Wilson, Pamela A.

Drying and gas or vapor contact with solids

Process

Gas or vapor contact with treated material

34454, 34117, F26B 300

Patent

active

060032456

ABSTRACT:
A method and arrangement for evaporation drying of a paper web in which the web is dried in three successive stages I, II and III that are carried out in the direction of progress of the web as follows: in the first stage (I), the web is heated in a short section in the machine direction quickly to a temperature of 55.degree. C. to 85.degree. C. minimizing web breaks of the relatively moist and weak web, after the first stage (I), the main evaporation drying of the web is carried out so that the evaporation efficiency and the rate of increase in the dry solids content of the web are substantially higher than in the first stage or in the final stage (III), and the web temperature does not substantially rise while the drying proceeds, and in the final stage (III), the drying is continued with a decreasing evaporation efficiency and an average rate of increase in the dry solids content of the web in the machine direction which is lower than in the preceding stage (II) but higher than in a conventional cylinder drying with single-wire draw so that the paper quality is controlled at the same time.

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