FIELD: machine engineering, namely equipment for corrugating sheet materials.
SUBSTANCE: transformed mandrel has shaping surface of flat trapezoidal members jointly coupled one to other by means of flexible material to which said members are secured with use of adhesive. Shaping surface has flat members in the form of isosceles triangles arranged in rows between trapezoidal members and jointly coupled to them along saw-tooth folded-structure lines. Said isosceles triangles are oriented in such a way that their bases turned one to other are jointly coupled along zigzag lines of protrusions and their apexes form articulation joints along zigzag lines of recesses.
EFFECT: enhanced quality of articles.
3 cl, 2 dwg
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