Prediction of the paper properties

PaperMac is a library containing blocks for simulation of paper properties.

The PaperMac blocks can be combined with the regular FlowMac blocks to create models for a specific Paper Machine.

A PaperMac model is often a simplified process model, but still containing all the most important process units determining the paper properties.

PaperMac01

In a PaperMac model there is a mass balance for fiber, filler, chemicals and based on the mass balance we can calculate production cost for a paper grade.
The PaperMac customer will get meters for calculation of pulp and paper properties:
– Optical properties: ISO Brightness, CIE L*a*b*, Opacity
– Density, Thickness, Basis Weight.
– Bending Stifness- Tensile- and Tear strength
The PaperMac customer will have to provide a lot of data, and most likely do a lot of experiments in laboratory, pilot scale and production scale.Starting from having nothing, it takes about 6 months to just get data.
The PaperMac modelling is much quicker!
The first PaperMac model takes time, but the advantage is that You then will have a system for accumulating knowledge in and the next times it is required to develop a new paper grade or optimise a paper grade it will be much quicker!
With the mass balance and the relationships between inputs and properties we can find the cheapest alternatives for obtaining the wanted paper properties.

As a PaperMac customer You will be guided through the process of doing:

– Lab studies

– Data analysis and mathematical modelling

– Implementation of the results in PaperMac blocks (programming)

– Collection of mill data

– Calibrate the model against present paper grades

– Make a recipe for a new paper grade

 

Here is an example of a PaperMac study and the results of model calibration:

  PM X 42.5 PM X 42.5 PM X 45 PM X 45 PM X 48.8 PM X 48.8
  Mill Simulation Mill Simulation Mill Simulation
Kraft, % 2.9 0 0.7 0 0.4 0
TMP1+TMP2, % 100 50/50 100 50/50 100 50/50
Filler, % 0 0 0 0 0 0
DIP, % 0 0 0 0 0 0
Broke, % 19 18.8 17 17 15 15
BW, g/m2 42.2 42.5 44.7 45.0 48.4 48.8
Moisture, % 9.4 9.4 9.4 9.4 9.4 9.4
Density, kg/m3 657 657 657 659 661 661
Thickness, my 64.4 65 68.1 68 73.3 74
Tensile, N/m 2370 2432 2500 2574 2790 2801
Tensile MD/CD 3.03 3 2.98 3 2.95 3
Tear CD, mN 258 240 268 258 288 286
ISO Bright, % 58.1 59 58 58.7 58.1 58.6
Opacity, % 91.8 92.17 92.9 93.1 94.1 94.35
DeltaE 0.26 0.34 0.31 0.31 0.39 0.19
CIE L* 83.32 83.72 83.2 83.68 83.17 83.6
CIE a* -0.33 -0.33 -0.31 -0.33 -0.28 -0.31
CIE b* 5.07 5.07 4.97 5.08 4.81 5.00

 

 

For more information and examples of use of PaperMac, contact Øivind Opdal.

By email to: oivind (a) opdal.net

By phone: +47 481 46 096