US 6,423,184 B1 · Method and equipment for regulation of the initial part of the dryer section in a paper machine

Abstract

A method and an equipment for regulation of the initial part of the dryer section in a paper machine. Moisture is removed from the paper web in the press section (10) and the paper web is dried in the dryer section (R). The paper web is dried against heated faces of drying cylinders (20). The surface temperatures of the first drying cylinders (20) in the dryer section (R) are measured. The dry solids content/moisture content of the paper web (W) and the temperature of the paper web (W) before said first drying cylinders (20) are measured. In view of producing the desired running situation, based on the measurement results obtained, the surface temperatures of said first drying cylinders (20) and/or the dry solids content/moisture content and/or the temperature of the paper web (W) before said first drying cylinders (20) is/are regulated.

Claims21

Dependent claims

A method for regulation of the initial part of the dryer section in a paper machine having a press section in which moisture is removed from the paper web, and a dryer section in which the paper web is dried, and in which the paper web is passed from the press section into a first group of first drying cylinders forming a part of the dryer section, in which the paper web is dried against heated faces of the drying cylinders, the method comprising the steps of:

measuring the surface temperatures of the first drying cylinders of the first group of drying cylinders in the dryer section;
measuring the dry solids content/moisture content of the paper web and the temperature of the paper web upstream of said first drying cylinders, and
in view of producing the desired running situation, based on the measured surface temperatures and dry solids content/moisture contents, regulating the surface temperatures of the first drying cylinders, the dry solids content/moisture content, and the temperature of the paper web before said first drying cylinders.

An apparatus for regulation of the initial part of the dryer section in a paper machine having a press section and a dryer with a plurality of first drying cylinders, the apparatus comprising:

measurement devices fitted in connection with the first drying cylinders in the dryer section for measurement of the surface temperatures of said first drying cylinders;
a measurement device for measurement of the dry solids content/moisture content of the paper web and of the temperature of the paper web before said first drying cylinders;
and
a control device for regulation of at least one of
the surface temperatures of said first drying cylinders,
the dry solids content/moisture content, and the temperature of the paper web before said first drying cylinders,
based on the measurement results obtained by means of the measurement devices, so as to produce the desired running situation.

4 more elements

Dependencies are inferred from the claim text.

Method and equipment for regulation of the initial part of the dryer section in a paper machine

Life of this patent

Method and equipment for regulation of the initial part of the dryer section in a paper machine

Life of this patent

Abstract

Claims21