FABRIC HANDLE

KAWABATA EVALUATION SYSTEM OF FABRIC (KESF):

1. KESFB1 ® Tensile and shearing
2. KESFB2 ® Bending
3. KESFB3 ® Compression
4. KESFB4 ® Surface friction and variation
Total 16 parameters explained showned in the table and explained in detail below, 







Tensile 
LT 
Linearity of load extension curve 

WT 
Tensile energy 

RT 
Tensile resilience 
Shear 
G 
Shear rigidity 

2HG 
Hysteresis of shear force at 0.5º 

2HG5 
Hysteresis of shear force at 5º 
Bending 
B 
Bending rigidity 

2HB 
Hysteresis of bending moment 
Later compression 
LC 
Linearity of compression thickness curve 

WC 
Compressional energy 

RC 
Compressional resilience 
Surfce characteristics 
MIU 
Coefficient of friction 

MMD 
Mean deviation of MIU 

SMD 
Geometrical roughness 
Fabric construction 
W 
Fabric weight per unit area 

To 
Fabric thickness 




KESFB 1:




Stressed up to 500gf/cm > 500gf/cm load

Sample is clamped between 2 Jaws with effective test area of 5/L cm x 20/W cm and subjected to a constant tension of 10gf/cm by a weight attached to the drum on which one jaw is mounted. 

Constant tension is applied by allowing the drum to rotate freely. 

The shear force is measured by a transducer connected to the other jaw which moved sideways to apply the shear deformation and the shear strain is detected by potentiometer 






(a) WT = Tensile energy = 





= Area under the load – extension 

(b) Linearity (LT) 




(c) Resilience (RT)



(d) Shear Rigidity G 
slope of curve between 0.5º and 2.5º shear Angle 

(e) 2HG = Hysteresis of shear force at 0.5º shear angle 

(f) 2HG5 = Hysteresis of shear force at 5.0º shear angle 



Click on Image to run the animation 








KESFB2:




Fabric sample is bent between the curvatures –2.5 and +2.5cm^{1} 
(g) B = Slope between 0.5 and 1.5cm^{1 }curvature
(h) 2HB = Hysteresis of bending moment at curvature 1cm^{1}. 



Click on Image to run the animation 








KESFB3: 



The compressional properties between two plates and increasing the pressure while continuously monitoring the sample thickness upto a max. pressure of 50gf/cm^{2}(0.49N/cm^{2}). 

Compressional measurement is done by KESF3 as shown in Figure. The principle of the apparatus is shown in Fig. is an example of the recorded curves. The integration of the curve is computed by the computing block automatically. 
The signal from the transducer is passed the filter having prescribed frequency response and integrated to compute SMD. 




(i) LC = Linearity of compression curve 




Area under compression curve / Area of triangle (T_{0} AThe) 


(j) WC = Compressional energy 


(k) RC = Compressional resilience





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KESFB4:




(l) MIU = mean value of coefficient of friction, 







(m) MMD = mean deviation of coefficient of friction (b) 



(n) SMD = Geometrical roughness 







Click on Image to run the animation 







In addition to these,
(o) W = fabric weight per unit area and
(p) To = fabric thickness
are also reported in KESF system. 







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