Mpact Piet Retief manufactures recycled-based packaging and industrial paper grades. They recently replaced old blade sensors in pulper, dump tank, and chests by installing new 4th generation Valmet Blade Consistency Measurements. All units operate in the range of 1.6 – 6% Cs.
Instrument department is satisfied with the improved correlation and Paper Manager is very happy with the results and commented that the instrument call outs for consistency had decreased since the installation.
Summary
Location
South Africa
Challenge
Unstable measurement with lack of correlation
Repeated re-calibrations
Grubbens pulper
100% virgin pulp from digester, screening and cleaning take part in digester. Pulp blended in different ration, softwood/hardwood 60/40 50/50
NSSC dump tank
Pulp from NSSC dump which is made of different ratios from digester, soft wood, and hard wood. On a normal run, the ratio is 60% hard wood and 40% soft wood. This is regarded as 100% virgin pulp in the machine
No. 3 Chest
Blending chest which is a mixture of virgin fibers and recycled
On HP run blending of NSSC=35-45% and the balance is recycled
On Bayplexrun ratio is NSSC=80%, recycled=20%
No. 5 Chest
Stock from No. 5 chest made of broke paper from the machine and trims from winder
