perforerad

Perforerad is a Swedish adjective meaning perforated, describing a surface or material that has holes punched or cut through it. The holes are usually arranged in regular patterns such as a grid, but irregular layouts occur. Perforation can be produced in a wide range of materials, including metal, plastic, paper, wood, and textiles, using punching, laser cutting, or chemical etching.

Common applications include perforated metal sheets used in architecture and interior design for facades, screens, and ventilation; perforated plastics and films used for filtration, screens, and decorative effects; and perforated panels used for acoustics, where the holes influence sound absorption. Perforation also enables lightweight construction, drainage, light diffusion, or weight reduction depending on pattern and material.

In medicine, perforation refers to the development of an abnormal opening in a hollow organ, such as the bowel or eardrum, often due to injury or disease. The tissue affected by such an opening is described as perforated.

Etymology and terminology: The term derives from French perforer and Latin perforare. In engineering and manufacturing, perforation specifications are described by hole diameter, center-to-center spacing (pitch), hole pattern, and material thickness.