| 摘要 |
PCT No. PCT/SE92/00640 Sec. 371 Date Mar. 14, 1994 Sec. 102(e) Date Mar. 14, 1994 PCT Filed Sep. 18, 1992 PCT Pub. No. WO93/05901 PCT Pub. Date Apr. 1, 1993.The invention relates to a material in the form of a strip having a stiffening corrugation thereon. The corrugation consists of ridges and valleys therebetween which form arcs over the breadth of the corrugation zone. The corrugations form a wave pattern propagating in the longitudinal direction of the strip. The waves have no straight sections, and the relationship between the thickness of the strip T and the corrugation depth A is 0.5T<A<2T. In addition, the height of the arcs is at least as large as the wave length of the waves propagating in the Y-direction and alternating in the Z-direction.
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