Belting Glossary

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There are 67 names in this directory beginning with the letter T.
Tack
Having a property of temporary adhesion.

Tail end
The end of a conveyor, usually near its loading points.

Tail pulley
The belt pulley near the loading end of the conveyor system.

Take-up pulley
A pulley which can move in space due to gravity, a spring, or other forces in order to maintain relatively constant tension in a specific strand of a belt.

Take-up tension
See tension, take-up.

Take-up travel
The distance the take-up can move during the belt operation.

Take-up, automatic
See automatic take-up.

Take-up, gravity
See gravity take-up.

Take-up, screw
See screw take-up.

Tandem drive
A belt driving system employing two adjacent powered pulleys.

Tape line measurement-maximum length
The inside circumference of a belt measured around the pulley surfaces when the take-up idler(s) are moved out to where they take up all the belt slack their movement permits.

Tape line measurement-minimum length
The inside circumference of a belt measured around the pulley surfaces when the take-up idler(s) are moved in for the installation of the shortest belt possible.

Tear down
The removal of a ply of fabric in a multi-ply fabric belt to prepare the stepped down configuration for a stepped splice.

Tear propagation
Continuation of tear.

Telescoped roll
At the outside end of a roll of belting, turns of the belting progressively loosened and moved outward from the remainder of the evenly wound turns of the belting.

Template
A pattern to guide the punching of holes or cuts in belt ends.

Tensile member
See carcass.

Tensile strength
The maximum force, stress, applied to a specimen at rupture.

Tensile stress
The force applied to stretch a test piece (specimen).

Tension
Stress on a material tending to cause extension of the material.

Tension member
See carcass.

Tension minimum
The lowest tension occurring in a belt in a conveyor or elevator system under operating conditions.

Tension rating
Maximum safe working tension recommended by a belt manufacturer.

Tension ratio
In an operating belt system, the ratio of the larger to the smaller tension as the belt approaches and leaves a driving or driven pulley.

Tension, initial
The tension put into the belt at installation and prior to operation.

Tension, slack side
In a belt system, where the two portions of the length of a belt on either side of a driving or driven pulley have different tensions, the slack side tension is the smallest of the two.

Tension, slope
The tension in an inclined belt caused by the weight of the material being elevated in addition to the belt weight and independent of friction and other sources of tension.

Tension, take-up
The amount of tension in each of the runs of belting approaching and leaving the take-up pulley, the total of which is the force exerted by the take-up device.

Tension, tight side
In an operating conveyor system, the greater of the tensions as the belt approaches and leaves the drive pulley.

Tension, working
The maximum working tension for a fabric or belt recommended by the manufacturer.

Terminal position
The maximum working tension for a fabric or belt recommended by the manufacturer.

Terminal pulley
The pulley at or near the discharge end of a conveyor belt system.

Tex
A yarn size system defined as the weight in grams of 1000 meters of yarn.

Textile
A general term applied to yarn, cord, non-woven, or woven fabric made from a fibrous material.

Thermoplastic
Capable of being repeatedly softened by heating and hardened by cooling and in the softened state can be shaped by flow.

Tie cloth breaker
A leno or other open weave fabric breaker between a belt cover and the carcass.

Tie gum
A thin sheet of un-vulcanized rubber inserted between plies in vulcanized repairs of splices.

Tight side tension
See tension, tight side.

Tilted troughing idlers
Used for belt training.

Time cycle
The duration of time, in minutes, required for one complete cycle of a conveyor belt.

Tire bead wire
Steel wire placed in or beneath the top cover to minimize rips in the belt by objects that penetrate the belt.

Tolerances
The limiting values for a dimension.

Top cover
Loss of the elastomer due to abrasion.

Top cover wear
The protective rubber cover on the material conveying surface or surfaces of a conveyor belt.

Tracking alignment
See training.

Traction
The friction between a drive pulley and the conveyor belt.

Traction top
See rough top.

Training
The process of adjusting idlers, pulleys, and loading conditions to insure the belt runs straight.

Training idler
An idler mounted on a mechanical device, actuated by the belt moving against it to make the belt run straight.

Trajectory
The arc made by material freely discharged from a conveyor system.

Transfer system
A combination of mechanisms to move objects or bulk material to or from a conveyor.

Transition distance
The distance between the last fully troughed idler and the flat driving or discharge pulley.

Transition idler
A troughed belt idler having a lesser degree of trough than the previous carrying idlers.

Transverse
A crosswise direction of a belt.

Transverse cord breaker
A cord fabric laid in the top cover at right angles to the belt edges.

Transverse rigidity
Resistance to belt deformation in the belt crosswise direction.

Transverse seam
The joint, across the belt, of two ends of a fabric ply in the belt or cover material.

Trapped air
Air which is enclosed in a product or between a product and a mold surface during cure.

Traveling deflector
A mechanism which moves over the carrying surface of the belt and deflects the conveyed material off of the belt.

Tripper
A fixed or moveable mechanism at some intermediate place in the conveyor system to discharge material from the belt.

Troughability
The property of a belt that permits it to conform to the contour of troughing idlers.

Troughability index
The ratio of the deflection of a freely supported transverse section of a belt to the distance between the freely supported ends.

Troughed belt
A belt operating in a conveyor system with inclined side idlers to cause the belt edges to turn up and increase the amount of material carried while minimizing side spillage of the material.

Troughing angle
The angle troughing idlers are to the horizontal extension of the flat carrying idler.

Troughing idlers
An idler system which supports a belt in a troughed configuration. Usually it consists of a center horizontal roll with an inclined roll on each side. See also catenary idler.

Twill weave
A fabric woven with the appearance of diagonal lines.

Twist
The rotation of a belt on its longitudinal axis. A 180 degree twist is used as a means of inverting a belt through the zone of the twist.