B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/1051, 18/928
B29D 23/00 (2006.01) B29B 13/02 (2006.01) B29C 53/04 (2006.01) B29C 53/32 (2006.01) B29C 67/00 (2006.01) B29C 71/02 (2006.01)
Patent
CA 1069667
ABSTRACT 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 se- lected 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. The length of the blank is established by the width of the roll and the width of the blank is selected according to the diameter of the pipe or insulated pipe to be covered. The blanks are preheated as they are carried on the upper stretch of an endless conveyor through a heater to a selected temperature be- tween 120°F and 180°F for a relatively short time interval to remove any memory therein. The blank is then directed between successive pairs of power-driven rollers in a course of travel that imparts a curl to the blank to form a curled tubular sec- tion. The curled tubular section is then confined in a tubular female mandrel of a selected size and heated to a selected temperature of between 120°F and 150°F for between about twelve to twenty-four hours to effect a permanent set therein.
247982
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