FIELD: technological processes.
SUBSTANCE: closed crimps are formed in sequence on a stripe blank in rolls in two cuts. Two lengthwise trapezoid crimps are made in the first cut. These crimps are parallel and symmetrical to the longitudinal profile axis, and are repeated in periods. The second cut forms traverse hemispherical crimps. Height of lengthwise and traverse crimps is equal. Traverse crimp crosses two opposite lengthwise crimps at half of their length. Traverse crimp ends are formed by sloping facets of lengthwise crimps, directed towards the longitudinal profile axis.
EFFECT: improved profile bearing capacity.
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