Improving energy and paper machine efficiency by using Wefapress expert knowledge and spare parts - Paper Technology International 2023 - Paper Technology International 2023 - Flipbook - Page 131

Improving energy and paper machine efficiency by using Wefapress expert knowledge and spare parts - Paper Technology International 2023

PAPERTECHNOLOGYINTERNATIONAL Improving energy and paper machine efficiency by using Wefapress expert knowledge and spare parts - Paper Technology International 2023
energy and paper machine
Improving
efficiency by using Wefapress
expert knowledge and spare parts
Achim Kneifel, Sales and Service Manager for Paper Industry, Wefapress Beck Co. GmbH
INTRODUCTION:
Papermakers have different reasons to change paper machine spare parts. Next to wear and poor performance it might be better
dewatering and energy efficency with new design, noise reduction, simplified maintenance or increased working safety. With more than 125
years of experiance, Wefapress supports pulp and paper mills all around the world to solve individual challenges.
Case:1
Increased production output cause in many cases headbox
overloading with higher flow rates or stock consistency than
originally designed. Combined with low microturbulences in the
forming section this will lead to poor paper sheet formation and fiber
agglomeration will create wet paper areas which limits the paper
machine speed due to fixed drying capacity. With new dewatering
elements it is possible to increase microturbulences in stock
suspension and to equalize the paper sheet on the forming fabric.
The fresh dewatering elements ensure an even dewatering about
the entire machine width and enable like this a higher production
speed. To increase the dry content at the end of the wire section
results also in huge energy and cost savings in the drying section.
As a plastics specialist and long-time partner to the paper industry,
Wefapress developed the hybrid material CeramX, which is a
UHMW-PE with ceramic additive. This hybrid material is extremely
wear resistant and satisfies also the most ambitious customers as it
combines the advantages of ceramic and plastic drainage elements
like
•
Extremely Low Friction
•
Easy Handling
•
Short Delivery Times
•
Low Investment Costs
•
At Least Doubled Live Time
CeramX allows service lives that are significantly longer than
possible with normal UHMW-PE while the costs and simple handling
of flexible parts match those for other plastic parts. It can be used
for forming boards, foils and suction box covers in the wire section at
machine speeds up to 1200 m/min and in the press section even up
to 2000 m/min for uhle box covers.
Figure 2: Forming and press section with Wefapress
dewatering elements.
Figure 1: Suction box cover in CeramX material.
Case:2
Slotted uhle box covers are not so efficient in dewatering the
press felt and especially for seamed felts it makes sense to change
to drilled cover perforation in order to support the felt and to avoid
that it get sucked into the slot over the complete machine width. This
gentle dewatering protects the felt seam and results in longer felt
life times. For the premium tissue manufacturer Hakle GmbH, which
produces high quality products at 1750 m/min, Wefapress replaced
ceramic uhle box blades with a drilled uhle box cover in CeramX
material. Mr. Faltin, the technical director at Hakle GmbH confirms
that it is very easy to install, saves drive power consumption and
further advantages of drilled uhle box covers in combination with
seamed felts are
•
the down time for felt installation gets reduced
dramatically
•
no complicated cantilevering is needed
•
work safety is increased as no papermaker need to
climp on rolls or framing
Figure 3: Chris Faltin, Technical Director at Hakle GmbH.
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