Apparatus for forming tubular pipe covering sections

Abstract From the Canadian patent

Apparatus and methods for forming generally tubular pipe covering sections with overlapping edge portions from a sheet of elastomeric material. For relatively thin material thicknesses the material is rolled on a male mandrel to provide a plurality of spiral wraps and this roll is heated to a selected temperature between 120°F and 150°F for at least twelve hours to effect a set in the roll. Selected lengths of the sheet material are cut from the roll to provide tubular pipe covering sections of a selected circumferential size. For relatively thick material thickness with substantial rigidity, a continuous roll of the material is cut transversely along its length to form a series of blanks. …