By Andrea Friedrich and Annick Welfring,
ISRA Vision Parsytec AG
Quick set-up times, increased production speeds
and a constant high quality are the key factors to an efficient
tissue production process. This of course is a demanding task,
considering the pressure of global competition and the current
market conditions. When attracting new business, especially during
economically challenging times, not only does price play a decisive
role but, more importantly, also the quality of material and delivery
terms. One solution: fully automated inspection systems for optimizing
manufacturing processes and for maximizing output by providing
exact monitoring and documentation tools.
A conventional tissue web inspection system detects
and classifies web defects such as different types of holes, stickies
or edge defects, which affect the quality of the manufactured
product to a high degree. Tissue inspection is aiming at the maximizing
blade runtime and production speed, optimizing the tissue making
process and reducing downtime during finishing. State-of-the-art
tissue inspection systems must make the right decision at the
right time. Therefore, a tissue inspection system must know the
critical defects and their causes and then make these causes available
for online production actions. A web inspection system, though,
is no longer sufficient. Instead, tissue producers now need and
want a whole productivity solution for processing and converting.
Several sheet breaks per day, a significant amount
of machine downtime and respective machine costs are among the
numerous everyday challenges in tissue production. Problems in
tissue production often lead to a delayed identification and thus
to a slow reaction to problems, hence to lower production speed
and even machine standstills.
With a whole new solution for tissue manufacturers,
ISRA Vision Parsytec can provide a system which detects defects
in the production process as well as in the converting process.
Compared to conventional web inspection systems, the advantage
of this solution lies in the fully integrated approach. The inspection
covers every level of the processing, including the yankee cylinder
and the converting process. Event capturing at the yankee cylinder
is fully integrated with web inspection on the paper production
machine and provides an early detection of edge variances.
Installed directly at the converting machine, the
tool provides defined speed reduction based on the exact defect
position of severe defects and the visualization of the defect
distribution. Thus, machine speed can be adapted and optimized
locally depending on the defects. In addition, it results in fewer
machine stoppages. An immediate intervention and a classification
of the product in different quality grades become accessible.
The result? An increased runnability and total throughput.
Tissue manufacturers gain extensive benefits from
the fully integrated system. In addition to early problem detection,
a 100% overview of the produced quality and the visualization
of process changes are gained, helping to reduce web breaks. The
quick detection of hidden defects allows for simple handling of
complaints and makes it an ideal tool for quality management.
Improved production quality enables process optimization
in production and converting. Various references such as installations
at WEPA (Arnsberg, Giershagen), Kimberly-Clark (Mainz), Fripa
Cartaseta (Däniken), SCA (Pernitz), CMPC (Talagante)
or Fripa (Miltenberg) confirm the advantages and performance of
ISRA VISION PARSYTEC tissue web inspection systems. These systems
contribute to production optimization - 24 hours
