The present invention relates to continuous cold-forming of strip material to produce building elements having transverse ribs extending across at least part of the element.

Cold-forming elements of this kind is often difficult because of the inherent tendency of thin strip to twist and distort as it issues from transverse rib forming means.

The blister is cold formed by advancing the pin (2) in a direction transversely relative to the plane of the film (4), towards and into engagement with a platen carrying indicia-forming die (12).

The method includes applying a plastisol to an interior surface of the cap, curing the plastisol at an elevated temperature in the cap, and cold-forming the cap containing the cured plastisol therein.

The invention further includes the abrasive article formed in the unfired state by the above process.