Pure Bending Tester
The KES-FB2-S Pure Bending Tester is capable of measuring hardness and recoverability when bending not only paper and non-woven fabric but also hair and film. Measured values are obtained using a power meter with sensitivity matching that of a fingertip, so results are correlated with sensory evaluations. The device provides accurate measurement even for samples with different processing methods, such as surface treatments and flexible processing. The KES-FB2-S is a multi-purpose pure bending tester that can be used without having to worry about the type of objects being measured.


Pure Bending Tester
System Configuration Diagram / Measurement Data

Sample Measurement Software Screens

▲ Bending properties

Obtainable Data

Item Characteristic value Description Reading the data
B Bending rigidity Higher values mean more rigid bending
2HB Bending hysteresis
Higher values mean poor recoverability

Relationship between B and 2HB, and human perception of bending rigidity

B correlates to the flexibility and rigidity felt when bending the object by hand.
The larger the B value becomes, the more rigid the sensation becomes, and the smaller the value becomes, the more flexible the sensation becomes.

2HB correlates to the recoverability (elasticity) felt as the object returns to its original position after being bent. The larger the 2HB value becomes, the poorer the recoverability becomes, and the smaller the value becomes, the better the recoverability becomes.

  • Auto Data Processing Unit (optional)

    Connecting this device to the instrument and to a PC allows the waveforms and numerical values of measurement data to be output.
    Obtained data can be saved as BIN data or CSV data.

KES (Kawabata Evaluation) SYSTEM

The Kawabata Evaluation System, centered on Sueo Kawabata, a professor at Kyoto University, and Masako Niwa, a professor at Nara Women’s University, is an objective evaluation method for measuring the texture of clothing fabrics based on the “The Standardization and Analysis of Hand Evaluation” provided by the Hand Evaluation and Standardization Committee of the Textile Machinery Society of Japan.

Pure Bending Tester
Measure hardness and recoverability when bending paper, non-woven fabric, and cloth through pure bending tests.
Measure treatment differences (such as flexible processing surface treatment).
Measurement is completed in about 20 seconds.
Hardness and recovery capabilities when bending can be read instantly, allowing for simple data analysis.
Measured values are obtained using a power meter with sensitivity matching that of a fingertip, so results are correlated with sensory evaluations.
Pure Bending Tester
Dimensions/Weight (approx.)
  • Measuring unit: W210 × D240 × H660 (mm) / 25 kg
  • Electronic unit: W180 × D400 × H400 (mm) / 10 kg
Power source 100 VAC, Max. power consumption: 30 W
Measurement environment temperature and humidity 20 to 30°C / 50 to 70% RH
(No condensation.) Temperature and humidity kept constant during measurement.
(Standard temperature and humidity conditions: 20°C / 65% RH)
*Installation should be in a location with minimal influence from wind or vibrations.
Bending load detection
  • Torque detector: Detecting system for torsional moment of a steel wire
  • Torque sensitivity (full scale): 4, 10, 20, or 50 gf·cm
  • Accuracy: ±0.5% or less of full scale
Curvature detection
  • Curvature detector: Potentiometer
  • Accuracy: ±0.5% or less of full scale
  • Max. curvature: K = ±2.5 cm - 1
Specimen size Dimensions: 10 cm × 10 cm (max.)
Thickness: 1 mm
Rate of bending deformation Rate of bending deformation: 0.5 cm - 1/sec         
*Specification details recorded here are subject to change without notice. We appreciate your understanding.

Page top