Content



The challenge

A testliner producer in Southern Europe wanted to upgrade the testliner quality, for which a 15% increase in burst index was required. The strength of the standard testliner grade is normally controlled by adding 12 kg/ton cationic starch. However, further increase in the starch dosage had only limited effect on strength, not more than a 10% increase in burst.

The solution

Kemira's new strength aid FennoBond® 3300E was added to the suction side of the machine chest pump in addition to 12 kg/ton cationic starch. FennoBond 3300E is a solution polymer with a high cationic charge, making it less sensitive to anionic trash and high conductivity compared to traditional strength aids.

The benefits

At 15 kg/ton of FennoBond 3300E, the burst index increased by 15% on average, allowing for quality upgrade of the testliner that can be sold at a higher price. Furthermore, the cationic demand in the headbox was also reduced. No issues with machine runnability or other paper qualities. The net profit was estimated at 10-15 €/ton of paper.

Key benefits
  • Quality upgrade allowing to charge a higher price for improved testliner
  • Improved control of anionic trash
  • Net profit of approximately 10-15€/ton of paper 
​Pre-trial ​0 ​2,0-2,05 ​140
​Trial ​15 ​2,36 ​70


Machine overview
  • Grade: Testliner, 130 g/m2
  • Machine type: 2 layer Fourdrinier, 170 ton/day, 390 m/min
  • Furnish: 100% OCC
Chemicals:
  • 12 kg/ton cationic starch
  • Retention program: silica + DPAM
  • pH 7
  • Conductivity: 1300-1500 μS/cm
  • Cationic demand: 140 μeq/L
  • Water usage: 10 m3/ton of paper
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