Knappar

Knappar are small fasteners used to join pieces of fabric or to operate devices. In clothing, they are the most common closure but they also appear on cushions, bags and upholstery, as well as on electronic devices as input controls in a broad sense.

Historically, buttons have been used for centuries, evolving from ornamental toggles to practical fasteners. Clothing buttons come in two main physical forms: flat sew-through buttons with holes, and shank buttons with a small protruding loop on the back. Sizes vary widely, from tiny to large, and the choice affects fabric weight, durability and style.

Materials range from traditional natural substances such as bone, wood, shell and metal to modern plastics and resins. Shell and carved bone were valued in historical garments; today plastics such as cellulose acetate, nylon and polyester are common. Production methods include stamping or cutting for flat buttons and molding for plastic buttons; some are drilled for threading, while others use a separate shank or a reinforced attachment method.

Uses and care: Buttons secure openings and can add decorative value. They are typically sewn with a cross-stitch or with a thread shank to accommodate thicker fabrics. When replacing, it is important to match size, hole count and thread type. Buttons should be stored with similar garments to prevent loss or damage, and care should be taken to avoid forced strain on the attachment.

In technology and everyday language, knappar also refer to switches or input controls on devices and software interfaces.