| 摘要 |
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 present invention addresses this problem by providing stress relief means for applying compression load to the transverse ribs immediately downstream of each pair of transverse rib-forming rolls. The stress relief means comprises a first roller means and a second roller means forming a nip for receiving ribbed strip (8), wherein each roller means is disposed to engage an outer crest portion of each rib (5) projecting towards it. The second roller means comprises a pair of substantially parallel coextensive spaced-apart second rollers (14, 15) and the first roller means comprises a first roller (16), said first roller (16) being substantially parallel to, coextensive with and equi-spaced from each of said second rollers (14, 15).
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