FABRIC HANDLE

KAWABATA EVALUATION SYSTEM OF FABRIC (KESF):

1. KES-FB1 ® Tensile and shearing

2. KES-FB2 ® Bending

3. KES-FB3 ® Compression

4. KES-FB4 ® 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

KES-FB 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
 
 

KESF-FB 1 Animation

 

KES-FB-2:

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
 
 

KES-FB-3:

The compressional properties between two plates and increasing the pressure while continuously monitoring the sample thickness upto a max. pressure of 50gf/cm2(0.49N/cm2).

Compressional measurement is done by KES-F-3 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 (T0 AThe)
 

(j) WC = Compressional energy

 

(k) RC = Compressional resilience

 
 
Click on Image to run the animation
 

KES-FB4:

(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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