Method for detecting a fibrous web tear in a drying section...

Details Method for detecting a fibrous web tear in a drying section... Method for detecting a fibrous web tear in a drying section...

2011-07-26

2011-07-26

Nguyen, Sang (Department: 2886)

Optics: measuring and testing

By monitoring of webs or thread

For flaws or imperfections

C356S238100, C356S429000

Reexamination Certificate

active

07986410

ABSTRACT:
This invention relates to a method for detecting a tear in a fibrous web in a drying section of a machine for producing the fibrous web, whereby the fibrous web is passed through the drying section by way of at least one dryer fabric, whereby the tear is detected by at least one optical web tear detection device, which includes at least one luminous source and one detector, and whereby a cut-off apparatus for the fibrous web is directly or indirectly activated by the web tear detection device. The optical web tear detection device is operated over an extended wave length range in order to detect a tear in the fibrous web reliably. In addition, the invention relates to an apparatus for performing the inventive method.

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