langanpoiston

Langanpoiston is a textile finishing operation aimed at removing protruding threads and loose fibers from the surface of woven or knitted fabrics. The goal is to improve visual uniformity, tactile quality, and durability by preventing fraying, snagging, and pilling. The term derives from Finnish lanka meaning thread and poisto meaning removal, and it is used in industry literature to denote the process of finishing where stray yarn ends are trimmed or burned away.

Practices vary and may be mechanical, thermal, or chemical. Mechanical approaches include precision trimming with knives or blades, brushing, and combing to lift and remove end fibers. Thermal methods, such as singeing or controlled flame treatment, burn off short protruding fibers on the fabric surface. Some processes combine optical or ultrasonic sensors with automated trimming to target only the excess threads, reducing the risk to fabric structure. Chemical post-treatments are less common but can be used to relax or dissolve specific fibers in certain blends, under controlled conditions.

Applications of langanpoiston occur in textile mills, garment finishing facilities, and other fabric production lines where surface quality is important. It is particularly relevant for fabrics prone to loose ends after weaving or knitting, such as staple-fiber knits, blended fabrics, or delicate surfaces. When performed appropriately, langanpoiston reduces visible flaws, improves seam performance, and contributes to a higher-quality appearance and feel. Potential drawbacks include the risk of fabric damage, fiber loss, and energy consumption, which must be managed through careful process design.

See also: fabric finishing, trimming, singeing, lint removal, quality control in textiles.