Nahtform

Nahtform, also called seam form, is a term used in textile engineering to describe the geometric and functional arrangement of a seam in fabric construction. It encompasses stitch type, seam allowance, edge finishing, and integration with closures or components. The concept helps classify seams by how fabric edges are joined and finished, affecting appearance, strength, and performance.

Common forms include straight seam, French seam, flat-felled seam, lapped seam, overlocked or serged seam, and bonded or welded seams. A straight seam joins edges with a straight stitch along a single line, typically with a standard seam allowance. French seam provides an enclosed edge finish, often used in lightweight fabrics. Flat-felled seam is durable and neat, commonly used in shirts and jeans. A lapped seam has one edge overlapped over the other, common in heavy fabrics. An overlocked or serged seam finishes edges to prevent fraying. Bonded or welded seams are used for nonwoven or waterproof fabrics.

Parameters used to specify Nahtform include stitch type (lockstitch, chain stitch), thread density, seam allowance width, edge finish, and whether the seam is open, closed, or bound. The choice depends on fabric characteristics, garment performance requirements, and aesthetic goals.

Applications: apparel, upholstery, automotive and technical textiles, and industrial products. In design practice, the Nahtform is selected early in patternmaking and influences drape, fit, and durability.

History: As an explicit taxonomy, Nahtform gained prominence with advances in pattern engineering and automated sewing, enabling standardized communication of seam specifications.