RACAbbreviation for The Rubber Association of Canada.
Raised cover centerA belt cover with increased thickness along the center portion of the belt.
Raised edgeA flanged edge conveyor belt to minimize spillage.
Raised rib beltA belt with transverse or diagonal bars or cleats on the top cover.
Rated conveyor beltThe manufacturer’s recommended maximum working tension for a conveyor belt.
Rated working tensionSee rating.
RatingThe normal working tension recommended for a belt.
Raw edgeThe uncovered square edge of a belt created by cutting after vulcanization.
RecoveryThe degree an elastomeric material returns to its original dimensions after being stressed.
ReefedA belt folded back and forth on itself.
Reinforcement agentAn ingredient in a polymeric compound not basic to its vulcanization used to increase its chemical and physical properties.
Reinforcing elementThe strengthening members of a belt.
RepairThe area of new material replacing damaged material in a belt.
Repose angleSee angle of repose.
ResinCertain materials produced by chemical synthesis.
ResistanceThe property or ability of matter to withstand the effects of force, pressure, heat or chemical action.
Return idlerA roll(s) that supports a belt on its return run.
Return runThe part of a conveyor system where the belt returns to the tail.
Ribbon blenderA type of internal mixer used to mix powders and liquids into a dry powderous viscous or liquid mass.
RibsTransverse configurations on the carrying side of a belt to facilitate carrying material on an incline.
Riveted plate jointA mechanical fastener with rivets projecting through a plate on both sides of the belt.
RMAAbbreviation for The Rubber Manufacturers Association, Inc.
RMBTAbbreviation for Rated Manufacturers Belt Tension.
Roll beltingBelting made to ordered width but of nominal lengths for cutting later into shorter lengths.
Roller bed conveyorA conveyor belt operating over a series of steel support rollers.
RosinThe hard amber-colored material of the residue from the distillation of oil of turpentine.
Rotary pressA vulcanizing machine consisting of a rotating, heated drum with a flexible steel band partially encircling the drum, which continuously advances a material while under pressure and heat between drum and band.
RotocureSee rotary press.
Rough topA belt made with projections in the carrying surface to improve the ability of the belt to carry material on inclines.
Rubber cementA mixture of polymeric compound or elastomer used as an adhesive or sealant.
RubberizedCoated with rubber compound.
RunThe distance or route covered by a conveyor.