Paper Technology International 2024 - Journal - Page 17
PAPERTECHNOLOGYINTERNATIONAL
Figure 3: Connecting Information (quality and process) from different lines in the mill-wide system
control system for example, helps to synchronize the roll quality data
with the sheet cutter. This improves throughput as only bad material
is rejected, reducing waste and avoiding customer claims. Slitting
optimization on the other hand helps to enhance the arrangement of
the rolls on the current reel with full visualization of the slitting plan,
and gives complete documentation of the actual slitting process. In
addition, a reliable detection of process-critical defects at the paper
machine using AI-based classi昀椀cation helps to precisely detect a
defect position and perform a short-term speed reduction during the
winding of this to avoid breaks and other disturbances.
Looking at tissue, layer merging with defect position
synchronization, including unwind diameter and speed at the
converting line, is a key contribution to create multilayer reels that
meet customer and quality expectations. This enables full quality
grading that takes third party sensors for formation, moisture,
thickness and more into account and creates an automated quality
assessment of each roll.
Quality decisions
Connecting data throughout the entire process from pulp
to recycling helps to answer the main question whether a roll can
be shipped or if not whether it can be repaired or re-assigned
for a different purpose or customer. Roll release, repair and reassignment tools are already used in multiple other industries i.e.
metal. With these tools, plants can generate blocking and release
proposals for each reel according to your quality rules based
on surface defects or third-party quality data. Roll repair helps
to analyse the surface defects and create easy-to-follow repair
instruction. And 昀椀nally, a roll allocation can help to 昀椀nd a new order
and get the best price even for non-perfect rolls.
The complete quality circle
To make the complete quality circle a reality, ISRA VISION
doesn’t only offer web inspection and web break monitoring but a
complete portfolio of solutions to connect the quality results all the
way from raw material over base products and 昀椀nishing treatments
all the way to the end customer product, and back to recycling into
one quality cycle.
There will be no need to immediately recycle tons of paper
due to speci昀椀c defects (coating streaks, stickie’s, ink or colour
particles) within a reel when the exact position, type and amount
of them within the reel is precisely documented. ISRA VISION´s
inspection systems are specialized not only to 昀椀nd all kind of surface
defects, like the tiniest blade streaks or contaminations, but also to
classify each defect (if it is a plastic or ink particle, a water drop or oil
spot) using latest AI based classi昀椀cation methods like deep learning
algorithms and multilayer neural networks also combined with colour
inspection cameras.
Having this information already available, the next step
would be to hand this over to the next production or process stage.
Especially when it comes to rolled material it´s really detrimental
if one does not know exactly in which section of the roll a defect
from a former process is included. Sheets or parts can be ejected
precisely based on all the information available from the very 昀椀rst
production step of the base materials.
For instance, companies specialised in 昀椀nishing and coating
could now link this information to their vision solutions. This would
de昀椀ne the exact position of defects coming from the treatment
process, and defects coming from the base product would be known
even if they transform their appearance after the 昀椀nishing treatment.
This information could be used by the treatment companies to
optimize their production process based on defects which occur
during their specialized production, and again precisely locate a
defect on the 昀椀nished reel/sheet de昀椀ning which surface defect was
coming from which production step.
This way even 昀椀nished products such as barrier coated
paper could be handed further down the process chain even
with pinholes present, minimizing the waste thanks to the exact
knowledge about each defects position.
At the end only a 100% perfect quality product will leave the
last processing plant to the end customer. Whether it is non printed
material or printed material 昀椀nally inspected by our print inspecting
systems.
With a full circular quality inspection system, ISRA VISION
enables not only a sustainable resource handling but also ensures
the competitiveness of a paper or tissue mill in demanding times and
with even tighter regulations on the horizon.
More info: https://go.isravision.com/pti
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