Flax Fibre

 

Describe the Historical Background of Flax Fibre
Flax is one of the oldest cultivated fibre crops in the world, dating back to at least 30,000 years ago. Ancient Egyptians used flax to make linen for clothing and mummification wraps. It was widely used in Europe during the Middle Ages and became an essential textile fibre before the rise of cotton. Flax cultivation spread to North America in the 17th century, contributing to the textile industry’s growth.

Fig: Flax before fiber extraction

Discuss the Harvesting and Retting of Flax Fibre

• Harvesting: Flax is harvested when the stems begin to turn yellow and the seeds are still immature. Pulling the plants from the roots helps preserve fibre length and quality.

• Retting: This is the process of rotting away the inner stalk to release the bast fibres. Retting can be done in several ways:

  • Dew Retting: Laying the stalks in the field to decompose naturally by moisture and microorganisms.

  • Water Retting: Submerging stalks in water to accelerate microbial action.

  • Enzyme Retting: Using enzymes to separate fibres in a controlled environment.

List the Points to Be Considered Before Grading

• Fibre length and fineness

• Colour and brightness

• Cleanliness and presence of shives or woody matter

• Strength and flexibility

• Uniformity in texture and appearance

Mention the Defects and Causes of Flax Fibre

• Weak fibres – Caused by poor retting or over-mature harvesting

• Dark or uneven colour – Due to improper retting or drying

• Excess shives – Incomplete removal of woody matter

• Short fibres – Result from mechanical damage during processing

• Mildew or mould – Caused by improper drying or storage

Classify Flax Fibre

• Line Flax: Long, fine fibres obtained from well-retted and combed flax. Used for high-quality textiles.

• Tow Flax: Shorter, coarser fibres obtained as by-products during processing. Used for lower-grade fabrics or industrial applications.

State the Chemical Composition of Flax Fibre

• Cellulose: ~71%

• Hemicellulose: ~18.6%

• Lignin: ~2.2%

• Pectin: ~1.8%

• Waxes and fats: ~1.5%

• Moisture and ash: Balance percentage

Fig: Chemical Composition of Flax fiber

Describe the Physical & Chemical Properties of Flax Fibre

• Physical Properties:

  • Light brown to greyish colour

  • High tensile strength

  • Low elasticity

  • Good moisture absorbency

  • Crisp texture and good drapability

• Chemical Properties:

  • Resistant to alkalis

  • Weak against strong acids

  • Can be bleached and dyed easily

  • Biodegradable and eco-friendly

Mention the End Uses of Flax Fibre

• Linen textiles (clothing, bed sheets, tablecloths)

• Ropes and twines

• Upholstery and home furnishings

• Paper production (high-grade)

• Composite materials and insulation products

• Eco-friendly packaging and biodegradable products