STRIP ELEMENT FOR SPIRAL PIPE AND METHOD OF RESTORING AVAILABLE PIPE Russian patent published in 2020 - IPC B29C63/32 

FIELD: manufacturing technology.

SUBSTANCE: disclosed is a strip element which can be converted into a spiral pipe with an increased perimeter by spiral winding. First connecting part is located in one end part of the cross section, which is orthogonal to the direction of the length of the strip element, and the second connecting part is located in the other end part of the cross section. Spiral pipe is formed by spiral winding of strip element and connection of second connecting part with first connecting part of preceding one turn. Strip element 90 has a cross-section configuration in which the initial direction W₉ of the width connecting the first connecting part and the second connecting part in the cross section can be inclined to the side of the external surface towards the side of the first connecting part at winding of the strip element. Neutral axis L_N9 of minimum moments of inertia of cross section preferably has an inclination to side of inner surface relative to initial direction W₉ of width towards side of first connecting part.

EFFECT: invention provides improved mechanical properties of the product.

8 cl, 15 dwg