Structural Polymer
Branched carbohydrate chains found within the cell walls of flax plants function as the cementing agents that bind cellulose microfibrils together. Although cellulose provides the main axial strength, hemicellulose contributes to the flexibility and initial moisture retention of the raw stalk. This component dissolves more easily than pure cellulose when exposed to basic chemical treatments or high temperatures.
In linen production, its presence impacts how well the individual fibres adhere during the retting process.
Chemical Transition
Breakdown of this polymer occurs during the biological retting of flax in the field or in controlled tanks. If high levels of hemicellulose remain within the harvested fibre, the flax stays too stiff for fine spinning and remains prone to uneven breakage during scutching. Careful monitoring of heat and pH levels allows mill chemists to manage the partial removal of these sugars without damaging the structural cellulose backbone.
The solubility profile determines the duration of specific pre treatment washes used in Chinese mills.
Technical Influence
Physical properties of the yarn often change based on the amount of residual complex sugars present after finishing. Because hemicellulose absorbs more ambient humidity than simple crystalline cellulose, it plays a role in the elongation and elasticity of the dry fibre. Managing these levels prevents the linen from becoming excessively brittle during high speed weaving operations.
Precise analytical testing provides a percentage value that indicates the thoroughness of the cleaning and refining steps.
