AB Lorentzen & Wettre Paper Bending Tester

L&W Bending Tester

L&W Bending Tester measures bending properties quickly and easily

L&W Bending Tester is used to measure a material’s resistance to bending. This can be done in different ways. Either by measuring the force needed to bend a test piece to a predetermined angle or by measuring and determining the bending stiffness, which is an elastic property of the material.

L&W Bending Tester is quick and easy to use. A test piece is placed in a clamp. When the operator presses the start button, the clamp closes about one end of the test piece. A support holds the test piece in place before the measurement. This helps the operator and leads to a repeatable measurement process. When measuring, the support is automatically lowered and does not hinder the movement of the test piece. If the auto-touch function is selected, the clamp turns slowly to move the free end of the test piece in contact with the load cell. The test piece is bent to the selected angle. The instrument records the force throughout the measurement process. The clamp then returns to the start position and the test piece is released.

The chosen measurements are automatically shown in the display and printed on the built-in printer.


Measures creaseability too

Creasing is performed when converting board and makes the material easy to fold in the right places. A large number of properties are calculated from the measurement curve’s bending moment relative to the angle (bending moment = force x length of bend), which facilitates the assessment of how the board should be creased when converted. When measuring creaseability, two sample groups are prepared and tested: one group with uncreased test pieces and one group with creased test pieces. The measurements are carried out as normal, but often with a bending angle of 90°.

For good measurements, it is crucial that the test piece is firmly held in place. This is achieved with pneumatic clamps that secure the test pieces with 200 kPa between level, parallel jaws.

Load cell with auto-touch function

Auto-touch means that the test piece is brought into contact with the load cell with a small, predetermined force. From this position the test piece is bent through the predetermined angle. The benefit of the auto-touch function is that no manual intervention is required to place the test piece in contact with the load cell; without this function, it can be difficult and time consuming to ensure that the same force is used each time.

Easy to get started

All configuration and programming is done only once via a computer. Thereafter, the computer is disconnected from the instrument. The instrument is then controlled through pushing one or two buttons on the instrument panel. The most common configurations are pre-set at the factory.

If requested, the instrument can be configured so that the operator is given guidance on the order of measurement within the measurement series. Checks and calibration are easily and rapidly performed, with the aid of the weight platform included (calibration weights are not included).

  • Pneumatic clamping of the test piece
  • The test piece is held in the correct position for measurement
  • Auto-touch function of the load cell against the test piece
  • Easy to use
  • Measurement of creaseability
  • Pre-programmed for different measurements
  • Built-in printer

L&W Bending Tester – Code 160
Weight suppor., PC software for instrument setup. Serial cable. Printer rolls.


0–5000 mN


Bending angle

Standard measurement 5°, 7.5°, 15°, and 30°
Creaseability 90°

Bending length
5, 10, 15, 20, 25 and 50 mm
Bending velocity

Standard measurement 5°/s
Creaseability 45°/s

Test piece
 Width 38 mm, max thickness 3 mm


Standard measurement

 Measurement values on the printer
- bending resistance at selected angle (several angles possible for same measurement)
- calculated bending stiffness at 5°, 38 mm sample width, 50 mm bending length
- taber value

 - bending stiffness, slope
- max bending moment
- angle at max. bending moment
- angle at zeromoment on return movement
- bending work (area under the curve)
Measurement values on data output
- bending stiffness, slope
- max bending moment
- bending moment at 90°
- bending moment on relaxation
- angle at max bending moment
- angle at zeromoment on return movement
- bending work (area under the curve)
- complete test graph

- mean value
- standard deviation
- coefficient of variation
- maximum and minimum values of the series



- connectable to L&W Autoline Data Acquisition Workstation


Installation requirements

40 W
Instrument air
0.4–1.0 MPa, (60–150 psi), 0.1 m3/h (3.5 ft³/h) NTP

Calibration weights 1–500 g



0.3 × 0.4 × 0.4 m
12 × 16 × 16 in


0.1 m³
3.5 ft³

Net weight

9 kg
20 lb

Gross weight

19 kg
42 lb


Applicable standards
Bending resistance (15°) APPITA/AS 1301.453s, ISO 2493, NF Q 03048, SCAN P 29, TAPPI T 556 
Bending stiffness (5°) DIN 53121  


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