X-Ray Diffraction Azimuthal Peak Deconvolution for Climate-Impacted Bast Fiber Sourcing Verification
Azimuthal XRD peak deconvolution isolates microfibril angle and crystallite alignment, exposing climate-degraded bast fibers before mill processing.
Middle Lamellae
Intercellular Region
Anatomical structures in flax stems consist of a pectin-rich layer that cements adjacent plant cells together within the fibre bundles. This binding area constitutes the middle lamellae, which provide structural cohesion to the stem until it is harvested.
Retting Process
Extraction of high-quality textile fibres from the woody flax stem requires the controlled breakdown of this cementing material. Microorganisms in the soil or in water tanks digest the middle lamellae during the retting stage, allowing the fibre bundles to separate from the wooden core. If this decomposition is incomplete, the mechanical extraction of the fibres is difficult and results in damaged, coarse bundles.
The progress of this biological process is recorded in the field inspection report to determine the optimal timing for harvest.
Fibre Separation
Weaving and spinning mills require thin, flexible fibre strands to produce fine-count linen yarns of high uniformity. Residual parts of the middle lamellae in under-retted flax hold the fibres in thick clusters, which increases the stiffness of the yarn and limits its spinning potential. Conversely, over-retting damages the cellulose walls, so mills carefully check the fiber bundle thickness before purchase.
This evaluation ensures that the raw material can be split into fine individual fibres on the hackling machine.