A CRITICAL REVIEW OF THE CONVENTIONAL HOT PLATEN PRESSING METHOD OF LABORATORY PRESS DRYING
作者:
JukkaA. Lehtinen,
期刊:
Drying Technology
(Taylor Available online 1986)
卷期:
Volume 4,
issue 2
页码: 183-215
ISSN:0737-3937
年代: 1986
DOI:10.1080/07373938608916324
出版商: Taylor & Francis Group
关键词: Owell time;board;laboratory test;paper;press dry;strength
数据来源: Taylor
摘要:
The functioning of a conventional heated platen laboratory press for paper or board press dry experiments is considered analytically and in the light of experimental results from the literature. A press dry sample dries so that the evaporation zone recedes from the edges toward the center. Since the dwell time of the web within a certain moisture content range influences the resulting strength characteristics, a conventional press dry experiment will not produce a uniformly strong web. To study the possible distribution of the strength deviation, a strength development function is generated and used in computer simulation of a web being press dried. The results emphasize the importance of dwell time as a factor in press dry strength devel oprnent. Finally, basic principles are reviewed or evolving an improved press dry laboratory device, and a model is proposed.
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