Felvävar

Felvävar is a term used in Swedish textile production to describe defective weaves in which warp and weft strands fail to interlace according to the intended structure. The fault can manifest visually as misalignment of pattern or color, as irregular fabric texture, or as reduced mechanical strength. The category includes several specific defect types, such as skipped weft picks, displaced warp yarns, floated or loose threads that are not fully interlaced, and pattern misreads in woven designs.

Causes range from loom timing errors and worn or misaligned heddles, reeds and shuttle timing to incorrect tension, yarn variation, or operator mistakes. Environmental factors such as temperature and humidity can also affect yarn behavior and lead to felvävar.

Detection and disposition: felvävar are typically identified during weaving preparation, on-loom inspection, or post-weave quality control. Depending on severity, defects may be repaired, trimmed, or the fabric may be rejected or downgraded. In some cases small faults are acceptable in industrial fabrics or salvageable for lower-grade products.

Prevention and control: strategies include regular loom maintenance, correct setup and timing, consistent yarn quality, controlled tension, and trained operators. Implementing standardized inspection procedures and, where possible, automated defect detection helps reduce occurrence.

See also: weaving, textile defect, quality control, fabric inspection.