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FIBER - Product Specifications
  
Characteristics
 
Mechanical Property
Dennier Tensile Strength (g/d) Knot Strength (g/d) Elongation
1.5 3.7 - 4.5 3.0 - 3.8 33 - 45
3.0 3.1 - 3.9 2.6 - 3.4 39 - 51
5.0 2.9 - 3.7 2.4 - 3.2 40 - 52
15 2.4 - 3.2 1.8 - 2.6 39 - 51
10 2.8 - 3.6 2.1 - 2.9 40 - 52
   
 
Comparison of Basic Properties of Varlan Fibre
S.No. Property Verlun Wool Cotton Nylon Polyster
1. TENSILE STRENGTH (g/d) DRY

2.5 - 5.0

2.0 - 4.5

1.0 - 1.70

.8 - 1.7

3.0 - 4.9

3.3 - 6.4

4.5 - 7.5

3.7 - 6.4

4.7 - 6.5

4.7 - 6.5

WET
2. KNOT STRENGTH (g/d) 2.0 - 4.0 2.5 - 3.5 3.0 - 7.0 3.7 - 5.5 4.0 - 5.0
3. ELONGATION% DRY

25 - 50

25 - 60

25 - 30

25 - 30

-

25 - 60

27 - 63

20 - 50

20 - 50

WET
4. YOUNG'S MODULUS (kg/mm2) 400-850 130-300 950-1300 80-300 310-870
5. MOISTURE REGAIN (%)
  COMMERCIAL STD. CONDITION
(20C, 65% RH)

2.0

1.2 - 2.0

15

16

8.5

7

4.5

3.5-5.0

0.4

0.4-0.5

6. SPECIFIC GRAVITY 1.17 1.32 1.54 1.14 1.38
7. CROSS SECTION SHAPE
   
  
Whiteness
Verlan has excellent whiteness of 90% (3d staple fibre). This contributes to its being dyed in beautiful and excellent shades.
   
 
Ressitance to Light
Verlan is superior in resistance to light among synthetic fibre so that it has little deterioration in strength by sunlight.

Change of fibre strength & enongation when subjected to light
(measure by fade - o-meter)

Time subject to light (hrs)

Property In Wet
Since varlan is hydrophobic fibre, it is low in water absorptivity (equilibrium moisture regain ) and shows little change in its tensile strength, elastic properties and wrinkle recovery during washing and it dries quickly.

Secondary Transition Point
Since varlan is thermoplastic fibre, creases and pleats made on verlan fabrics applying proper heat are very stable.

The secondary transition point, melting point & softing point of verlan are as follows and the secondary transition points in the case of wet heating is 20 - 30c lower than that of dry heating.

   Secondary transition point
-  Dry heating at around 95 - 105c.
-  Wet heating at around 70 - 80c.
   
   Softening point
Turns viscose and softens at 220 - 240c.
   
   Melting point
Not definite, decompose before melting similarly to wool.
 

Strength Elongation Curve Under Heating Condition (Behavior In Hot Water)
VERLAN is readily deformed by slight stress at high temperature above the secondary transition point. The deformation is temporarily set by cooling. This strength elongation curve of Verlan at various temperatures in water and under dry heating conditions are shown in figure mentioned below. At the temperatures above 80C in wet heating (in hot water) or above 100C in dry heating, the slope of the curve becomes flat, breaking strength lowers an elongation becomes remarkably higher. When the temperature exceeds the second order transition point, young modulus lowers and elongation become higher, with the result that the thermoplasticity to this fibre is delayed and dye diffusiion becomes better in dyeing.

Chemical Properties

  

Against acid slight decrease in strength of verlan is observed at 0.5 - 1.0% concentration at 100C.

   
  

Against organic solvent, the strength of Verlan is observed at ordinary temperature.

   
  

Verlan is slightly affected by oxidizing agents.

   
  

Verlan is insoluble in general solvents but is soluble in following solvents:
Dimethyl, Foramide, dimethyl Sulphoxide (DMSO) Dimethyl Acetamide (DMA) , Ethylene , Carbonate, Saturated zinc, Chloride, Solution etc.


Thermal Property of Verlan Fibre

Verlan fibre is thermo plastic. It is readily deformable by slight stress at high temperature above secondary transition point. At temperature above 80C, in wet heating or above 100C in dry heating, breaking strength lowers and elongation becomes remarkably high. This is because thermo-elasticity of the fibre is displayed at high temperature and dye diffusion becomes better in dyeing. In order to prevent dimensional charges, least stress is given on textiles at high temperature.

  

Verlan shows fairly good retention, 10% - 20% reduction in strength by heating at 200C for 2-4 hrs (by heat).

   
  

Verlan is free from yellowness so far it is heated with in limit of 10min at 120C OR 3min at 150C.

 


  
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