Pure Bending Tester

The KES-FB2-A Pure Bending Tester analyzes hand movements—referred to as “bending”—performed by artisans and professionals when judging a fabric’s texture. This device performs these movements mechanically, making it possible to obtain objective numerical data.

Obtainable data includes bending rigidity and recoverability for such targets as general fabric, cloth, paper, non-woven fabric, and film.
Bending characteristic data is useful for determining stiffness and fullness, softness, anti-drape stiffness.

● Improved data accuracy

Motor chucking makes it easier to mount thin samples that would otherwise be difficult to mount. This eliminates errors caused by the user and improves the accuracy of data.

● Display resolution (of software): 0.0001

The ability to measure from extremely small values up to a maximum of 50 gf·cm means measurement can be performed for a wide variety of samples.

Measurement Sample Example

  • General fabric
  • Fabric
  • Medicinal fabric
  • Car seats
  • Interior fabric
  • Non-woven fabric
  • Film-like samples

FB2-A _ Bending

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
Dimensions/Weight (approx.) Measuring unit: W830 × D530 × H370 (mm) / 60 kg
Power source 100 VAC, Max. power consumption: 50 W
Measurement operation Controlled maximum curvature system
(However, control is inverted when over-torque occurs.)
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.
Load detection Detector: Detecting system for torsional moment of a steel wire
Sensitivity (full scale): Switchable between 4 ranges (4 gf·cm, 10 gf·cm, 20 gf·cm, 50 gf·cm)
Accuracy: ±0.5% or less of full scale
Curvature detection Detector: Potentiometer
Maximum curvature: K = ±2.5 cm-1
Accuracy: ±0.5% or less of full scale
Rate of bending deformation 0.5 cm-1/sec (fixed)
Sample fixation method Tightening: Tighten with a ratchet screwdriver at a constant torque
Sample deformation length: 1 cm
Specimen size Specimen size: 20 cm × 20 cm (standard)
Sample width: 20 cm (max.), Sample thickness: 1 mm (max.)
*Specification details recorded here are subject to change without notice. We appreciate your understanding.
Pure Bending Tester
Apparel industry
Home care
Automotive industry
Paper and non-woven fabric manufacturers, etc.

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