Method for measuring the moisture content of a web of goods on a through-flow dryer and device for working the method
First Claim
1. A method for controlling the drying of an endless web of textile or paper material in a continuous through-flow dryer by regulating one or more drying parameters, which comprises passing heated and dried air transversely through the web to dry the web conveyed on a perforated surface, measuring temperature of the heated air, immediately before passing through the web and immediately after passing through the web, at several points over a length of a drying path on the perforated surface, and determining a temperature of the web indirectly and hence actual moisture content in the web at each of said several points by comparing air temperatures on both sides of the web at each of said several points along the drying path, and regulating at least one drying parameter in the dryer on the basis of the moisture content measured in this manner.
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Accused Products
Abstract
The position of the exhaust air flap of a through-flow dryer, for example, a screen drum dryer, is adjusted to determine the moisture content of the exhaust air. This is advantageously accomplished as a function of the desired drying temperature of the goods or their moisture content when the good leaves the dryer. Provision is made according to the invention to measure the temperature of the air after passing though the web, at least in the vicinity of the outlet of the dryer, to relate it to the temperature of the ambient air and thus to determine the temperature of the goods and hence their moisture content, since in the residual drying range, the moisture content of the goods is a function of the temperature of the goods. The exhaust air moisture content can then be regulated with this measured value.
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Citations
5 Claims
- 1. A method for controlling the drying of an endless web of textile or paper material in a continuous through-flow dryer by regulating one or more drying parameters, which comprises passing heated and dried air transversely through the web to dry the web conveyed on a perforated surface, measuring temperature of the heated air, immediately before passing through the web and immediately after passing through the web, at several points over a length of a drying path on the perforated surface, and determining a temperature of the web indirectly and hence actual moisture content in the web at each of said several points by comparing air temperatures on both sides of the web at each of said several points along the drying path, and regulating at least one drying parameter in the dryer on the basis of the moisture content measured in this manner.
Specification