more plied yarns twisted together.
drives, the distance between two shaft centers calculated from pulley diameters
and belt length being used.
machine with three or more internally heated or cooled cylinders used to (1)
continuously sheet out polymeric compound or fused PVC (2) to wipe polymeric
compound into the interstices of a fabric leaving a small portion of it on the
surface of the fabric, or (3) to lay a continuous sheet of compound on a fabric.
film of uncured elastomer produced from a calendar.
curvature of a belt relative to the center line (see bow).
maximum number of pieces, volume, or weight of material a belt conveyor can
handle in a given time interval and belt speed.
protective edge placed around a product internally reinforced with textile or
end covered with an elastomer to protect the carcass end.
fabric, cord and/or metal reinforcing section of any rubber product such as a
belt, as distinguished from the rubber cover.
A ply or
plies of fabric ruptured by impact or gouging.
resistance of a belt against tearing.
determination of the tension at which a belt may be torn.
(or carrying) side cover:
portion of a conveyor that carries the load between the loading and discharge
outward face or side of the belt which carries the conveyed material.
made by depositing a layer of plastic, either molten, in solution, or in a
dispersion onto a surface, solidifying and removing the film from the surface.
of flexible belt-carrying idler with ends supported in pivoted stands. The
tube or rollers sag under the weight of the load to form trough.
Equipment Manufacturers Association.
mixture of polymeric compound or elastomer used as an adhesive or sealant.
application of cement around the edge of a fabricated product with or without
internal reinforcement for protection or adhesion. (A form of Capped Edge.)
end sealed with the application of elastomeric cement.
horizontal roll between the side troughing rolls.
distance between the center of two pulleys or idlers. Also called centers
or center distance.
of bucket elevator having a belt which travels at sufficient speed to discharge
material from the buckets by centrifugal force.
relatively open weave duck of approximately square woven construction made with
single or ply yarn.
of a powdery surface condition due to disintegration of surface binder or
elastomer due in turn to weathering or other destructive environments.
shallow cracks on the surface generally due to effect of destructive action of
or profile arranged in a Vee shaped configuration on a belt carrying cover to
stabilize material carried up an incline.
abrasion resistant elastomeric lining in a chute to protect the metal chute from
relative to the horizontal a chute is inclined.
raised sections on a conveyor belt to stabilize material carried up an incline.
moving, endless conveyor belt formed into a tubular shape by joining its edges
while carrying material, and opening the edges while in motion to receive and
disc idler with several discs adjacent to each other at the ends of the idler.
ratio of the force required to move a package across a belt surface to the
weight of the package.
on the rim of a wheel or rubber product.
cut or produced with a series of evenly spaced V-shaped indentations in the
inner face to increase the belt's flexibility.
of a material to stick to itself.
Usually a squared end belt piece of full manufacturing length but not
full manufacturing width. See also slab belting.
introduction of plastic pellets into processing equipment without milling.
relative ease of bending following exposure to low temperature.
deformation under stress. See Creep.
the joining of two or more sub-straits together, using a two-part cement that is
chemically cured without using supplemental heat from an external source.
bond cement" usually is an uncured mixture of varied elastomers, chemicals,
and solvents that will not self-cure or vulcanize until mixed with an activator
to create a chemical vulcanization (usually exo-thermic).
of smoothness of an article which is acceptable in accordance with industry
mixture of a polymer(s) and other materials to give the desired chemical and
physical properties in the elastomeric components of a belt.
portion of a belt beneath the pitch line as the belt bends around a pulley.
deformation in a material remaining after it has been subjected to and released
from a compressive force.
of power of conducting or transmitting heat or electricity.
staining occurs on the area of an object directly in contact with the rubber
article it is known as "contact stain".
elevator belt that discharges by gravity over the inverted bottom of the
preceding bucket on the descending side of the elevator.
material or a product of known characteristics included in a series of tests to
provide a basis for evaluation of other products.
for the continuous movement or transport of bulk materials, packages or objects
along a predetermined path.
that carries materials from one place to another.
belt package deflector:
mechanical diverter placed at an angle across the belt to deflect packages off
the belt at specific locations.
increase in belt length which occurs when tension is imposed. Stretch is
either elastic or permanent. Elastic stretch is a temporary change in length
which varies directly with the pull. Permanent stretch is the residual change in
length after tension has been removed; it generally accumulates over a period of
conveyors, the width of a belt.
substance consisting of molecules characterized by the repetition of two or more
types of monomeric units.
strands of yarn twisted together.
with inserted textile or steel cords for the longitudinal tension-bearing member.
with plied or cabled yarns in the warp direction and a light weight filling yarn
spaced only sufficiently to process the fabric.
natural fiber of high cellulosic content.
In a fabric, the number of warp ends, the number of filling picks, or both in a
square inch of fabric.
conveyor belting, the weight applied to the take-up assembly to maintain proper
outer component of a belt.
transverse joint formed by connecting two lengths of cover stock.
cross-sectional view of the cover surface.
of material during use due to abrasion, cutting or gouging.
break or fissure in the surface. Generally due to excessive strain.
shallow surface imperfection.
surface with many fissures.
deformation occurring with the lapse of time in both cured and uncured rubber,
in a body under stress in addition to the immediate elastic deformation. Some
related terms and properties are stress-relaxation, hysteresis, damping, flow,
compression set and viscosity. See Cold Flow. (2) In belts, the action of a belt
alternately losing speed on the driving pulley and gaining speed on the driven
auxiliary drive, usually consisting of a small motor and speed reducer, used to
keep a belt conveyor in motion at a very low speed during non-operating periods
in extremely cold weather. It is used to prevent freezing of a belt and
The waviness of the yarn in a woven fabric. (2) The difference in distance
between two points on a yarn as it lies in a fabric and the same two points when
the yarn has been removed and straightened. Expressed as a percentage of
the distance between the two points as the yarn lies in the fabric.
difference between the diameter at the center and at the edges of a pulley or a
with a greater diameter at the center, or other points, than at the edges.
There are radial and trapezoidal crowns. Apex crowns are not
recommended for industrial belts.
in physical properties resulting from the crystalline reorientation caused by
required, at a given temperature, to produce optimum physical properties in an
temperature at which the rubber product is vulcanized.
action of the edges of a belt bending upward on the carrying run and downward on
the return run. Also called cupping.
or cord breaker imbedded in a belt cover.
uncovered edge of a laminated product, such a belt, created by cutting after
ability of a belt cover to withstand the cutting action of sharp objects.