Rechroming of Screen Baskets

Virgin Pulp
Graphic/
Speciality
Recovered
Paper
Board &
Packaging
Broke +
Approach
Flow System
Tissue
ProEnergy
+++
Raw
Material
Handling
ProQuality
+++
Pulping
Centrifugal
Cleaning
Screening
ProCapacity
+++
Deinking
Washing
Dewatering
ProYield
+++
Fiber
Treatment
Approach
Flow
System
ProSpace
++
Water,
Sludge,
Reject
ProEnvironment
++
Rechroming of Screen Baskets
Geometry is all that counts
Small particles in the paperstock create wear on the tip of the
profile bars in the screen basket. Worn profiles reduce
capacity and increase fiber content in the reject. The process
is progressive and irreversible and will end in the require
replacement of the screen basket.
Renewing the chrome layer maintains the contour of the
profile bars, and hence the screening technology.
Chrome is one of the most wear resistant materials which
also can be applied repitively. This makes rechroming the
most economical way to manage wear in screen baskets.
Customer benefits
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Optimized chrome caliper 80 μm - 250 μm
Repeatable (up to 10 times)
Lowest cost per ton of all coatings
Stress-free coating method
Simple, reliable profile checks
Slot width remains unaffected
Over 15 years of experience
Consistent technological results
Optimized rechroming intervals
On-site condition assessment
Predictable costs due to fixed pricing
1 C-bar baskets
2 Close up of profile bars
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Rechroming of Screen Baskets – Geometry is all that counts
Areas of application
Rechroming lends itself for all makes and types of baskets.
As well as bar-type baskets, perforated baskets can be
rechromed, using optimized calipers.
Preparations necessary by customer
Voith Paper sales and service personnel are trained to assess
the condition of baskets and determine the need for
rechroming. A micrometer measuring tool calibrated for the
type of profile gives a reliable indication of the condition of the
current chrome layer. Measurement data is compiled in a
software tool which generates a report stating the condition
of the baskets.
During planned shutdowns baskets are to be removed and
cleaned, ready for inspection. The actual assessments take
up to 30 minutes per basket, depending on their condition.
Service intervals
Inspection and rechroming intervals are based on the wear
pattern of each basket. If raw material composition is very
similar, long-term, reliable service intervals can be
determined.
References
Since 1995 Voith Paper has rechromed over 1,750 baskets
using this method, the majority for board and packaging
paper mills.
Further Information
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Link to product finder:
www.voith.com/paper
1159 en 03 l Technical data and graphical representations used in this document are subject to change without notice!
Options
On-site exchange of the basket, assessment, rechroming,
emergency stock, hiring, logistics, etc. can be integrated in a
service contract (5 years).