Pectin Thermal Degradation Kinetics during Bast Fibre Moisture Conditioning
Thermal pectin depolymerization degrades flax middle lamellae above 70°C, lowering bundle tenacity and forcing coarse count downgrades.
Inter-Elementary Fibre Cohesion
Structural Bond
Fibre bundle stability is determined by the adhesive force that holds individual plant filaments together in a single strand. Within the linen industry, inter-elementary fibre cohesion governs how well the roving holds together as it is drawn through the drafting rollers. This tension-bearing property is provided by the residual pectins left after the retting and boiling stages.
Precise control of this force prevents premature drafting breaks during yarn formation.
Spinning Influence
Drafting speed and yarn uniformity are directly affected by this natural adhesion. If the inter-elementary fibre cohesion is too high, the fibers cannot slide past one another, causing thick places and undrafted lumps in the yarn. The mill must then adjust the temperature of the spinning water to soften the binding gum.
Acceptance Criteria
Yarn strength and downstream weaving performance require a consistent level of internal bonding. When inter-elementary fibre cohesion is too low, the roving splits before it reaches the nip rollers of the spinning frame, causing immediate machine stoppages. The spinning laboratory tests the cohesion by measuring the drafting force required to pull the roving apart.
This value is recorded on the quality release certificate for each batch, ensuring the material meets the weaving department’s standard for warp-yarn preparation. This check is important for preventing expensive shutdowns on high-speed air-jet looms.