Ruggning

Ruggning is a Swedish term that denotes the act or process of roughening a surface or texture. The word derives from rugga, meaning to roughen, shake, or ruffle, and it is used in several technical and practical contexts without representing a single, unified discipline.

In materials science and surface engineering, ruggning refers to deliberate roughening of a substrate to improve adhesion of coatings, paints, or composites. Typical methods include mechanical abrasion, sandblasting, and chemical etching, which produce a surface with increased microscopic irregularities. The resulting texture is often described using roughness parameters such as Ra or Rz.

In construction and carpentry, ruggning describes preparatory work that roughens a surface before applying plaster, primer, adhesive, or other finish layers. The goal is to create better bonding and durability of the subsequent coating or layer.

In textiles and leather processing, ruggning can refer to processes that create a textured or napped surface to influence appearance, hand feel, or dye uptake. The specific techniques and desired outcomes vary by material and application.

Overall, ruggning is a contextual term rather than a standalone field, with usage that depends on the industry and the targeted properties of the surface. See also roughening, texturing, and surface treatment.