Method and apparatus for texturing a metal sheet or strip

An apparatus for texturing a metal sheet or strip, the apparatus comprising:

• (a) a plurality of pairs of rollers, wherein at least one of each pair of rollers has a textured pattern on the surface thereof;
• and
• (b) means for providing three or more texturing passes, and
• (c) means for applying pressure to the rollers, wherein the pressure applied is such that there is substantially no reduction in the thickness of the sheet or strip during each pass,
• wherein, in use, the textured pattern is transferred to the surface of a sheet or strip passing between each pair of rollers and the textured pattern on the sheet or strip resulting from each pass overlaps with that from the other passes to form a final textured pattern and
• wherein, in use, the rollers are capable of providing an average area of coverage of the surface of sheet or strip of less than 35%.