Modeling Solvent Drying of Coated Webs Including the Initial Transient
作者:
EdgarB. Gutoff,
期刊:
Drying Technology
(Taylor Available online 1996)
卷期:
Volume 14,
issue 7-8
页码: 1673-1693
ISSN:0737-3937
年代: 1996
DOI:10.1080/07373939608917167
出版商: Taylor & Francis Group
关键词: coatings;continuous webs;constant rate;falling rate
数据来源: Taylor
摘要:
A complete model for the drying of coated webs. as implemented in the spreadsheet DRYWEB for Lotus and for Excel, is described. The model predicts the temperatures and solvent levels throughout the length of the dryer. The initial transient as the coated web approaches the equilibrium temperature in the consiant rate period is calculated. The coating is divided into slices for a finite difference calculation of solvent diffusion to the surface, using a simple free volume model of diffusion. The semi-empirical constants needed can be found from one or two trial runs. The possible use of infra-red heating in addition to convection heating is included in both the constant and falling rates. The calculation of infra-red energy is discussed. The model assumes that the temperature is uniform from the top of the coating to the bottom of the base, and that assumption is justified.
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