using external forming surfaces, e.g. sleeves

Full Title

Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor (B29C61/10 takes precedence) > Bending and joining, e.g. for making hollow articles (B29C53/56 takes precedence) > by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges > for articles of indefinite length, i.e. bending a strip progressively > using external forming surfaces, e.g. sleeves