FIBERCARE® REFINING CASE STUDY

Refining Capacity Improvement & Refining Energy Reduction with FiberCare® on Fine Paper

Production at Mill 1

Case Study 1

Trial Situation

Mill targets: Increase refining efficiency

• Increasing refiner throughput

• Reducing refining energy

Mill problem: Lower Refining Capacity

Trial Situation

Paper grade: 120g/m2 offset paper

Machine speed: 150m/min

Furnish: 30% bleached softwood kraft pulp / 25% APMP

Aspen pulp / 45% wheat straw pulp

Enzyme treated pulp: Bleached softwood kraft pulp

Pulp and white water situation: •Pulp in Hydraulic Pulper: T = 20.3℃, pH = 7.56•White water: T = 18.7℃, pH = 7.89•Post-refiner Pulp: T = 25- 30℃

2 DDR

Refiners

FiberCare R

Taper Refiners

Pre-refining

Chest, 50m3

Post-refining

Chest, 50m3

Machine Chest,

50m3Pulper, 5m3

Enzyme: FiberCare R

Adding point: Pulper

Enzyme dosage: 110g/t

Enzyme treatment time: around 2 hours before refining

Trial Situation

Bleached softwood kraft pulp refining

• Before refining: 13ºSR

• After refining: 30-32ºSR,

12-12.5g (wet weight)

• Refiners: 1 set of taper refiner + 2 sets of DDR refiners

Trial Situation

Pre-trial FiberCare R

Taper refiner 160A 105A

1ST DDR refiner 208A 190A

2ND DDR refiner 200A 185A

Refining time 120min 73min

• Same refining pulp consistency: 3.2%

• Final refined pulp: 32ºSR, 12.2g

• No change in pipe valve openness

• Same amount pulp for refining: 1.6t

Trial Situation-Refiners

• Saved 132kwh/t refining energy with 0.11kg/t FiberCare R;

• Reduced 49% refining energy.

270

138

0

49%

0

50

100

150

200

250

300

Control FiberCare R

Refiner

energ

y c

onsum

ption,

kw

h/t

0

0.1

0.2

0.3

0.4

0.5

0.6

Energ

y r

educed

Refiner energy consumption, kwh/t Reduced, %

Trial Result-Refiner energy consumption

• Increased 9% breaking length with 0.11kg/t FiberCare R

3450

3760

0

9.0%

3000

3100

3200

3300

3400

3500

3600

3700

3800

Control FiberCare R

Bre

akin

g length

, m

0

0.01

0.02

0.03

0.04

0.05

0.06

0.07

0.08

0.09

0.1

Incre

ased

Breaking length, m Increased, %

Trial Result-Strength improvement

• Increased 4.2% tear strength with 0.11kg/t FiberCare R

480

500

0

4.2%

400

450

500

550

Control FiberCare R

Tear

str

ength

, m

N

0

0.005

0.01

0.015

0.02

0.025

0.03

0.035

0.04

0.045

Incre

ased

Tear strength, mN Increased, %

Trial Result-Strength improvement

0.11kg/t FiberCare R

Reduced 49% refining energy, saved 132kwh/t refining energy

Increased 9% breaking length

Increased 4.2% tear strength

Trial Conclusion

THANK YOU