Paper Technology International 2020 - Journal - Page 65

PAPER MASTER – State-of-the-art technology along the whole process chain
Jorma Järvinen, Business Unit Manager for ISRA VISION
INTRODUCTION:
In today´s paper, board, and tissue production, web breaks and a range of other substrate defects present a significant issue in
all types of paper machines, coaters, and converting operations. Reducing breaks and paper defects is an important objective given the
increasing speed and operating complexities of the present production environment.
ISRA is a leading provider of machine vision solutions
supplying the pulp, paper, board, and tissue industry. A complete
set of camera-based web monitoring and inspection systems covers
the whole process chain from pulp to reel. In addition, our systems
and software solutions help to optimize the entire production chain –
from headbox to the ultimate delivery of the manufactured product to
the customers.
This complete inspection setup enables manufacturers to
significantly reduce costs caused by avoidable web breaks in the
slitting and winding process, while accurate defect reports for each
cut roll offer 100% production documentation. Typically, savings of
500.000 €/annum can be realized by implementing the complete
inspection suite that consists of a Web Break Monitoring (WBM),
Web Inspection System (WIS), Converting Control System (CCS),
Unwind Control System (UCS), Paper Master Software and EPROMI
Paper Quality Management.
In the next step, the Web Inspection System (WIS) captures
high-resolution defect images over the full web width even at the
highest web speeds with high-speed line cameras - or area cameras
- and innovative lighting technology. For such a WIS systems, even
though paper is mostly monochrome, the use of color cameras in
the paper machine provides advantages. Such color cameras are
not used (although this would be possible) to monitor the color of the
paper but to find defects that are difficult or impossible to find with
black-and-white cameras. Even more important is the use of color
for classification, as this opens up new possibilities. Low contrast
defects cannot be detected by black-and-white cameras and would
most likely be missed. Moreover, the fault classification can be
significantly improved due to the additional color information. It´s
now possible to distinguish between an oil and a water drop certainly
an important feature for error source analysis.
Figure 1: State-of-the-art technology along the process chain – from Web Break Monitoring to Paper Quality Management.
Web Break Monitoring and Web Inspection are key to achieving
optimized production results and quality
All installed components in a paper machine are exposed
to harsh environments with dirt, moisture, and high temperatures
in which optical-electronic devices operate very delicately. On top
of that, a reduction in maintenance costs is always a welcome
addition. To withstand these environmental conditions and minimize
exposure, ISRA WBM System utilizes a special housing for the highperformance camera for web break analysis that always guarantees
perfect image quality. Even the smallest details become visible with
the camera so that faults can be automatically detected early in
the development process and stopped in time before costly events
occur. In addition to the high-resolution black-and-white camera
with integrated analysis, an infrared camera completes the product
range.
Figure 2: 100 % reliable web quality inspection driven by
embedded color camera technology.
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