Chemical Solutions by Paper Grade
Tiankai supports packaging paper, linerboard and corrugated paper, printing and writing paper, tissue, food packaging board and gypsum board liner paper. Product selection and dosage depend on the furnish, machine speed, charge balance and target strength or sizing performance.
Dry Strength Agent Application Cases
The following operating data come from the Tiankai product presentation. Results relate to the individual mill conditions described.
1. Printing and Writing Paper
A 5.2 m machine running at 1,250–1,300 m/min produced 70–80 g/m² laminating base paper using 22% softwood pulp, 53% hardwood pulp and supplementary wheat straw and APMP pulp. Dry strength agent diluted to 1.3% was added at the stock pump inlet at 10–12 kg per tonne of paper.
Tensile strength increased from 2.8 to 3.2, folding endurance from 15 to 18, and picking velocity from 1.1 to 1.7. The mill reduced the softwood pulp proportion by 2 percentage points while maintaining strength.
2. High-Grade Offset Paper
An 8.6 m machine running at 1,450–1,480 m/min produced 70 g/m² offset paper using mainly hardwood pulp, a small amount of softwood pulp and 15% deinked pulp. A 10 kg/t dose used two addition stages, with 60% in proportioning and 40% before the machine.
Tensile strength increased from 2.9 to 3.3, MD folding endurance from 16 to 18, and picking velocity from 1.5 to 1.77. The softwood pulp proportion decreased by 2 percentage points.
3. White Cardboard
The BM13 three-ply machine, 9,800 mm wide and operating at 1,200 m/min, produced 160–350 g/m² white cardboard. The mill applied TK3812CH with 20% solids to the core layer at the stock pump outlet at 10–15 kg/t.
Interlayer bond strength increased from 153 to 164 J/m², a gain of approximately 7.2%. The reported pre-dryer steam pressure reading decreased from 82.3 to 81.5, and the core-layer softwood pulp proportion decreased by 1 percentage point.
4. Paper Cup Board
A 3,200 mm machine with a design speed of 270 m/min produced 160 g/m² cup board. TK3812CH with 20% solids was used at 8–10 kg/t under neutral conditions without aluminum sulfate.
The operating figures included 1.31% headbox consistency, 0.27% white-water consistency, 75.7% retention, −7.2 mV Zeta potential and 2,400 μS/cm white-water conductivity. Interlayer bond strength stabilized around 165 J/m².
5. Noodle Bowl Paper
A 3,200 mm machine running at 541 m/min produced 205 g/m² noodle bowl paper. TK3812CH with 20% solids was added at the face-layer and core-layer stock pump inlets without aluminum sulfate.
Face-layer retention increased from 82.3% to 86.7%, core-layer retention from 75.6% to 79.9%, and interlayer bond strength from 176.7 to 177.7 J/m². The reported process operated without new paper breaks or holes.
6. Gypsum Board Liner Paper
A 5,000 mm four-ply machine running at 900 m/min produced 150–180 g/m² gypsum board liner paper with ASA internal sizing. Dry strength agent dosage was 28–32 kg/t, with aluminum sulfate at 3 kg/t.
Six test sets showed MD tensile readings from 193.5 to 197.6 and CD readings from 70.5 to 72.0. Liner pulp conductivity was 3,510 μS/cm at pH 6.3, and core pulp conductivity was 3,790 μS/cm at pH 6.0.
Application Support
Our technical team reviews mill operating conditions and pulp samples, recommends suitable grades and addition points, and provides on-site guidance and follow-up. Contact Tiankai to discuss your paper grade and operating conditions.