Web Measurement Device

a measurement device and web technology, applied in the field of web measurement systems, can solve the problems of frequent maintenance, holes or even sheets breaking on thin paper grades, and contact devices, and achieve the effect of accurate measurements

Inactive Publication Date: 2009-03-05
ABB LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]There is therefore a need in the art for a web measurement device that provides accurate measurements even when the traveling web is of a partially translucent type, such as paper.
[0008]In general a sensor in accordance with the present invention is provided for monitoring the thickness of a moving web. The sensor includes a first sensor head positioned on a first side of the moving web, a second sensor head positioned on a second side of the moving web, opposed to the first side, an inductor positioned in the first sensor head...

Problems solved by technology

In particular, sensors that contact the sheet simultaneously from both sides have a risk of pinching sheets containing lumps or defects, resulting in the sensors causing holes or even sheet break on thin paper grades.
Further, non-contacting sensors eliminate issues related to dirt buildup and wear that may cause measurement inaccuracies, thereby leading to frequent maintenance.
One particular drawback to prior art non-contacting devices are the issues related to light penetration.
Most paper has some degree of tran...

Method used

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Embodiment Construction

[0033]Referring now to FIG. 1, a gauge measurement device (hereinafter device 10) is shown and generally indicated by the numeral 10. Device 10 may be installed and used in a web making process line, for example, a paper making line. When installed, device 10 is positioned in close proximity to a moving web 12 for measurement thereof. Though the present invention is particularly useful for paper making applications, device 10 may be used to measure any type of continuously produced web. Further, one or more devices 10 may be positioned at any point along the continuous web production process to continuously measure web thickness at multiple points in the process.

[0034]The web 12 may move at high speeds through device 10 in the machine direction D. In the example where web 12 is a paper product, production line speeds in paper manufacturing can reach 100 km per hour or more. Device 10 contacts a bottom surface 14 of web 12, while a top surface 16 is not contacted and is measured opti...

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PUM

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Abstract

A sensor is provided that measures web caliper using optical and magnetic measuring devices. The optical measuring devices may employ a confocal chromatic aberration method to accurately determine the distance to the moving web and the magnetic devices may be ferrite core coil and target. Means of stabilizing a moving web are included for improving dynamic measurement accuracy.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application claims the priority of U.S. provisional patent application Ser. No. 60 / 969,373 filed on Aug. 31, 2007 entitled “Web Thickness Measurement Device,” the contents of which are relied upon and incorporated herein by reference in their entirety, and the benefit of priority under 35 U.S.C. 119(e) is hereby claimedFIELD OF THE INVENTION[0002]This invention relates to web measurement systems.DESCRIPTION OF THE PRIOR ART[0003]Sheet materials, such as paper, are produced in thin continuous webs and require highly accurate thickness (caliper) measurement and control. Commonly, these measurements are accomplished by means of sensors that physically contact the web at both the top and bottom side. Also, various non-contacting sensors have been developed that may be fully non-contacting (no physical contact), or sensors that contact physically contact sheet at only one side.[0004]The speed of papermaking machinery has increased dramatic...

Claims

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Application Information

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IPC IPC(8): G01B11/06G01B9/02
CPCG01B7/023G01B7/107G01N33/346G01B11/0691G01B11/026G01B2210/44G01B2210/50G01N21/86
Inventor HELLSTROM, AKENAIMI, RAMBODO'HORA, MICHAEL
Owner ABB LTD
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