Measuring arrangements in a shortened dry end of a tissue machine

A measuring device and drying technology, applied in the direction of measuring device, paper machine, dryer section, etc., can solve the problems of weak tissue paper, easy to break, etc., to save space, reduce floor space, and eliminate the effect of moving mechanism

Inactive Publication Date: 2005-10-26
METABO PAPER KARLSTAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In tissue machines, this is disadvantageous because the tissue paper is not strong and thus tends to break during open threading

Method used

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  • Measuring arrangements in a shortened dry end of a tissue machine
  • Measuring arrangements in a shortened dry end of a tissue machine
  • Measuring arrangements in a shortened dry end of a tissue machine

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Embodiment Construction

[0028] The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. However, the present invention may have many different embodiments and is not limited to the embodiments set forth herein; rather, these embodiments are provided so that this description will be thorough and complete, and will fully convey the knowledge to those skilled in the art. scope of the invention. Like reference numerals refer to like elements throughout.

[0029]Figure 1 shows the dry end of a paper machine suitable for making tissue paper according to a first embodiment of the invention. As usual, the web is dried in a Yankee dryer having heated drying cylinders 20 rotating in the direction of arrow 22 . The web exits the dryer cylinder 20 and is preferably creped by a creping doctor 24 having a doctor blade 26 . A cleaning blade 28 located after the creping blade is used to clean the surf...

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Abstract

A property of a paper web is measured using one or more reflectance measurement sensors emitting measuring beams onto the web and receiving the beams reflected from the web, from which the web property is deduced. The web is supported on a web support during the measurement, such as on a passive or active airfoil or fabric. One or more measurement sensor(s) can be integrated within an active airfoil, and can comprise a plurality of optical fibers having sensing ends arranged in the airfoil such that the sensing ends of the fibers face the moving paper web through one or more apertures in a web-supporting panel of the airfoil. Alternatively, a traversing sensor can be mounted within the airfoil. Other embodiments include a reflectance sensor mounted adjacent an airfoil or other web support such as a through-air drying fabric or a support belt for the web.

Description

technical field [0001] The invention relates to a papermaking machine and a papermaking method. In particular the invention relates to a measuring device for measuring properties of a moving web in the short dry end of a tissue machine. Background technique [0002] In the production of paper, the condition of the paper web is typically monitored at certain points in the web path through the paper machine, and the papermaking process adjusted if necessary based on the web condition. For example, at the dryer end of a paper machine, it is common to monitor the web coming out of the end dryer section of the paper machine to measure properties such as basis weight and moisture. In particular, the distribution of these properties in the machine direction (MD) and cross machine direction (CD) is deduced from the measurement results. An ideal web has a flat MD and CD distribution for all parameters of interest. In practice, these distributions are not fixed at any time. Howeve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/35B65H18/02B65H18/26B65H75/10B65H75/18B65H75/28D21F3/00D21F5/00D21F7/00D21F11/14D21G9/00D21H27/00
CPCB65H2515/805B65H2301/41376D21F5/00B65H2701/5122D21G9/0036B65H2515/10D21F3/00B65H2801/84D21F11/14B65H2406/112B65H2401/112B65H18/26D21F11/145B65H2553/822B65H18/02B65H23/24D21G9/0063G01N33/346B65H2553/82B65H2220/03
Inventor 安德斯·汤米·林登
Owner METABO PAPER KARLSTAD
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