Large Bending Tester
The KES-FB2-L Large Bending Tester accurately and quickly measures factors related to curvatures in small bending moments (bending hardness and recoverability). Adding to the small area available with conventional models, the KES-FB2-L enables measurements that were not previously possible, such as large bending moments and bending rigidity of thick sheet material and composites (products) made from multiple materials. The device also offers excellent data reproducibility in addition to easy measurement.
The KES-FB2-L has been put to use in a variety of industries, including the automotive industry.

Measurement Sample Example

  • Disposable diapers
  • Resin sheet material
  • Leather seats
  • Architectural membrane material
  • Automotive interior material


Large 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.

Large 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 consistent with sensory evaluations.
Large Bending Tester
Dimensions/Weight (approx.)
  • Measuring unit: W420 × D370 × H970 (mm) / 50 kg
  • Electronic unit: W180 × D400 × H400 (mm) / 20 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): 80, 200, 400, or 800 gf·cm
  • Accuracy: ±0.5% of full scale
Curvature detection
  • Curvature detector: Potentiometer
  • Accuracy: ±0.5% of full scale
  • Max. curvature: K = ±0.4 cm-1
Specimen size Dimensions: 20 cm × 20 cm (max.)
Sample thickness: 15 mm max.
*Specification details recorded here are subject to change without notice. We appreciate your understanding.
Large Bending Tester
Disposable diapers
Sanitary items
Resin sheet material
Architectural membrane material

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