SOUNDABSORBING ELEMENT AND PROCEDURE FOR MANUFACTURE OF THIS ELEMENT AND USE OF THIS ELEMENT

摘要

The invention relates to a soundabsorbing element including a sheet of material with holes in it and a process for manufacturing the same, in which the material sheet is self-supporting and the holes are microslits (1) arranged at predetermined distances from each other in the length and width of the sheet, in which at least part of the sheet close to each slit has been partly pressed out of the plane of the material. The manufacturing process according to the invention includes that a sheet of material is worked by a shearing tool, which is designed to create microslits by applying a sufficiently high pressure at predetermined locations on the sheet at which the material sheet partly breaks and at least part of the sheet close to each microslit is pressed out of the plane of the material.