AB Lorentzen Wettre STFI Fibermaster

L&W STFI Fibermaster


By measuring fibre characteristics, the quality and characteristics of pulp can be described in a more relevant way than before. Also, the measurement technique is automated by means of a special sampling system, permitting automatic and frequent analysis of pulp quality during manufacture. L&W STFI Fibermaster measures fiber length according to the latest ISO standard, something that is unique for online measuring systems.
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The L&W STFI Fibermaster measures, among other things, the fibre:
· length
· width
· deformation
· flexibility
· coarseness
· fines

along with a number of add-on modules (refer to separate information concerning modules), for:
· shives
· freeness
· brightness
· NIR (near infra-red)
· measurement of fibre blend conditions
· kink
· vessel cells

Originally, our L&W STFI Fibermaster was an accurate research and development instrument. When the industry showed interest in using this technology online, extensive development work began. Both hardware and software have been redesigned in order to produce an industrial system with the maximum possible availability. One important function is the self-cleaning measuring cell that never gets blocked, even if it is exposed to disruption. Having samplers located along the entire process chain means that the process can be followed up at frequent intervals and that deviations are quickly detected.

When manufacturing bleached chemical pulp, purchasers have demanded that the suppliers must perform better and more frequent testing of pulp before delivery. In some cases, suppliers (aiming to lead the market) have themselves taken the initiative to improve product testing. More frequent testing requires a reduction in the cost per test; otherwise the overall cost would be far too high. This can be resolved by a higher level of automation, which is possible with the new technology that is offered by the L&W STFI Fibermaster. Yet another reason for frequent testing is the possibility of monitoring the process more closely, thereby gaining long-term customer confidence with fewer complaints. One way for a pulp mill to apply this control is when changing the pulp blend. The Blend program package helps to ensure quality when changing over.

Using flexible fibres produces paper with better strength characteristics. Measurements have shown that fibre from spring growth is more flexible than fibre from that grown in the summer. Unique to the L&W STFI Fibermaster is its capability of measuring fibre flexibility. In order to do this, the form factor is measured an extra time with a high flow in the measuring cell. It is possible to set four different rates of flow in the L&W STFI Fibermaster. Flexibility is defined as the difference in form factor between high and low (normal) flows through the measuring cell. Spring growth fibres, which are wider than summer growth fibres, have thinner walls and tend to collapse. Therefore, they are more prone to bending. Relatively straight fibres are needed to perform this measurement.

Specification

L&W STFI Fibermaster – Code 910 (on-line)/911 (lab)


Results

Fibre

Mean length
Mean width
Mean form factor
Fines
Coarseness
Data divided in 5 length intervals
Bendability in 3 length intervals
Distribution of length, width and form factor
Two dimensional length/width matrix with proportion of length, form factor and bendability

Local deformations
(bends and folds)

Kink/mm
Kink/fibre
Kink >60° per fibre
Average segment length
Mean kink angle

Coarseness

Weight per fibre length
(manual intake of fibre weight)

Shives

Ratio of shives to fibres
Length/width
Shives volume/fibre volume

Vessel cells

Ratio vessel cells to fibres
Area vessel/volume fibres
Length/width distribution

Freeness (drainage)
Can be calibrated for a specific pulp against CSF
Blend software package
For example, the proportion of leaf fibre in a leaf fibre/needle fibre blend. Up to four pulp components can be included in a blend


Connections

Network



Installation requirements

Instrument air
Dry, oil free
Pressure
0.6 MPa (90 psi) or 0.3 MPa over process pressure
Air consumption
160 l/min


Water

Consumption

Cabinet
0.2 m³/h (53 US gallons/h)

Sampling device and dilution tank

0.3 m³/h (40 US gallons/h)


Pressure

Cabinet
0.3–0.6 MPa (45–90 psi)

Sampling device and dilution tank

0.6 MPa (90 psi)


Temperature

Cabinet
30-40 °C (90–100 °F)


Filtration

Cabinet
25 µm

Sampling device and dilution tank

50 µm
Drainage
1 tube/pipe >25 mm
Power
Max 1000 W

Size

Dimensions

Volume
Without Freeness

1.3 × 0.6 × 0.8 m
51 × 24 × 31 in

1.43m³
51 ft³

With Freeness

1.8 × 0.6 × 0.8 m
71 × 24 × 31 in

Only freeness: 0.34 m³
12 ft³




Net weight

Gross weight
Cabinet

175 kg
385 lb

260 kg
573 lb

Standards

Applicable standards
ISO 16065-2

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