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  Composition  
     
 
 

Physical Properties of Jute fibres

The major physical properties of jute fibre briefly presented in the following table.

Table: Physical Properties of jute fibre

 (Macro & Micro Structure)

Ultimate Cell Length (L)

Average

2.50 mm

 

Range

0.8  –  6.0 mm

Ultimate Cell Breadth (B)               

Average

18 Ám

 

 

Range

10  –  25 Ám

L / B  Ratio

Average

110

Fibre  Fineness

 

1.3  –  4.0 tex

Fibre  Length ( after Carding )

 

2  –  50 cm

Density

True

1.46 g / cc

 

Apparent

1.10 – 1.34 g / cc

Bulk Density

 

0.4  –  0.5 g / cc

Degree of Crystallinity ( X-ray )

 

55  –  60 %

 

 

Moisture Absorption

 

Moisture Regain

at 65% RH

13.8 %

 

–    at 100% RH

36.0 %

Transverse Swelling in water

Diameter-wise

20%

 

Cross-sectional area-wise

45%

Water holding Capacity

 

500 %

 

 

Thermal Properties

 

 

Specific Heat

 

1.36 x 103 J kg-1 K-1

Thermal Conductivity

 

427.3 mW m-1 K-1

 

Heat of Combustion

 

17.5  J / g

Ignition Temperature

 

193 o C

Heat of Wetting

 

18.2 calories

 

 Chemical Properties of Jute Fibre

The chemical composition of jute fibres and sticks are given in the following tables

Table: Chemical composition of jute fibre

Constituents

(in % of Bone Dry Weight of the Fibre)

              Jute

 

C. capsularis

C. olitorius

 

Alphacellulose

60.0 – 63.0

58.0 - 59.0

 

Hemicellulose

21.0 – 24.0

22.0 – 25.0

 

Lignin

12.0 – 13.0

13.0 – 14.0

 

Fats & Waxes

0.4 – 1.0

0.4 – 0.9

 

Pectin

0.2 – 1.5

0.2 – 0.5

 

Proteins / Nitrogenous matter, etc.

 

0.80 – 1.9

0.8 – 1.6

Ash

0.7 – 1.2

0.5 – 1.2

 


Table: Chemical composition of jute sticks

Constituents

Jute Stick (in % of Bone Dry Weight of the Fibre)

Alphacellulose

40.8-47.5

Hemicellulose

23.0-23.6

Acetyl Content

3.6-4.7

Lignin

22.2-23.5

Fats & Waxes

1.7-2.4

Pectin

0.5-0.7

Ash

0.6-0.8

 Source : Sur and Amin (2010), Physics and Chemistry of Jute. In Jute Basics (ed) International Jute Study Group. P 35-55.

 

 

 
 
     

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