Apparatus for the detection of holes and plugged spots
AssigneePulp and Paper Research Institute of Canada
InventorsIvan I. Pikulik, P. Daniel Gilbert, Jean Hamel
Life of this patent
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Abstract
The invention relates to an apparatus for detecting plugged sites and holes and for measuring of the water permeability properties of pervious machine fabrics. Plugged sites in a permeable fabric are detected by sensing water pressure pulses occurring in the nozzle at the moment when a stream of water flowing through the nozzle contacts a plugged site on a fast running fabric. The apparatus can be used on-line to simultaneously detect plugged sites and holes on a moving pervious fabric while monitoring its water permeability properties.
Claims7
An apparatus for detecting plugged sites and holes of an endless pervious traveling fabric for supporting a paper web in a papermaking machine, said apparatus comprising:
- i) nozzle means having a nozzle orifice positioned and arranged to engage a surface of said pervious traveling fabric which is not supporting the paper web, for directing, under an essentially constant pressure, a stream of water through interstices of said pervious traveling fabric;
- ii) a pressure pulse sensor operably housed in said nozzle means for sensing pressure changes developed in the stream, responsive to interruptions of water flow through said pervious traveling fabric.
Dependencies are inferred from the claim text.