Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Convoluting or twisting means
Patent
1975-03-24
1976-11-30
Spicer, Jr., Robert L.
Plastic article or earthenware shaping or treating: apparatus
Preform reshaping or resizing means: or vulcanizing means...
Convoluting or twisting means
72170, 72146, 264339, 425445, 425DIG200, B29C 1702, B29D 2312
Patent
active
039946568
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.degree. F and 150.degree. F for at least 12 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 thicknesses 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 between 120.degree. F and 180.degree. 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 section. 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.degree. F and 150.degree. F for between about 12 to 24 hours to effect a permanent set therein.
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Ceel-Co
Lewis, Jr. Ancel W.
Spicer, Jr. Robert L.
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