Contitech Conveyor Belt Splicing Manual GoodyearBelting.com 866-711-4673

Stringing the Belt

Textile belts that have been slit from a full width slab at the

factory should be spliced with the factory cut edges on the

same side of the conveyor. The words “Fact Edge” are painted

on the factory edge of slit rolls.

If the Factory Edges cannot be matched to the same side for

splicing, one of the slit rolls will need to be re-rolled; such rolls

will be identified with “Re-rolled” painted on the belt’s edge.

For new installations and major replacements, the following

procedure is recommended for belting with Sensor Guard

loops

or Cord Guard

™

XD Rip Inserts. Each roll of belting will be clearly

identified with a roll number.

›

The first end cured at the factory will be attached

to the shell.

›

The last end cured in the factory will be the outer wrap.

›

Typically and unless otherwise specified, the top cover will

face “outside”.

All rolls of belting are to be spliced onto the conveyor in the

following sequence starting with the last manufactured roll

(e.g. roll #8 of a total of 8).

›

The inside wrap of roll #8 will be spliced to the outside wrap

of roll #7.

›

The inside wrap of roll #7 will be spliced to the outside wrap

of roll #6 and so on.

After the belt has been positioned, the means of threading it on

the conveyor system must be considered. If the new belt is a

replacement, the old belt can be used to pull it on. A method to

pull belting on the system is as follows: The old belt is clamped

off, cut and the new belt then spliced to the end of the old belt

using plate type fasteners or pulling plates as illustrated

in Fig. 2-4.

The trailing end of the old belt is connected to a suitable power

device to pull the belt through the system. The conveyor drive

motor can be used to pull on the new belt. Other suitable

pulling devices such as cord winches, belt winders and

bulldozers, can also be used. See Fig. 2-5.

For a new conveyor installation having little or no slope, a rope

or cord of suitable strength should be attached to steel pulling

plates. The rope or cord is then threaded around the conveyor

system and attached to a suitable power device to pull the

belt into place.

A belt being installed on a system with a relatively high degree

of slope (12 degrees or more) must be handled with more

precaution to guard against run-away. The belt roll is set up as

previously mentioned, usually at or near the head pulley. This

is generally the most accessible. Assuming the conveyor is

sufficiently long to require more than one splice, the carrying

side and the return side may be threaded on separately. Care

must be taken to see that the heavier cover is up on the

carrying side and down on the return run.

NOTE: If belts are to be strung on both the carrying and return

side of the system, then re-rolling of the belts for one of the sides is

necessary before stringing to ensure the correct sequence in splicing.

For major installations, rolls can be shipped in this configuration

by prearrangement.

As the belt is fed on the system, tension at the roll tends to build

up due to the weight of the belt on the slope. For this reason,

some method of braking is required, such as using a belt clamp

mounted on the conveyor structure, through which the belt

is threaded. Where the slope is very long, additional clamps

should be used, spaced approximately 1000 feet (305m)

apart. Mechanical, air and hydraulic clamps are recommended.

Wooden clamping devices are not recommended.

To estimate the pull required to hold a belt on a slope, multiply

belt weight (lb./ft.) times the vertical lift of the slope and add

10%. For example, assume a 40-lb./ft. belt and a 300-ft. (91m)

high slope. The approximate pull is (40 x 300) x 1.1 = 13,200 lb.

Fig. 2-4: Pull Plate for Fabric Belt

Sharpened Driving Bolt

Eye and Shackle Designed for Load

Cut-off Protruding Ends

Bottom Plate

Belt

Material:

1. 1/2" to 3/4 in. Plate

2. Top plate about 8".

square held back 1".

from leading edges.

Match drill bottom plate.

Fig. 2-5: Typical belt winder (with snub roll) set-up.

II. Belt Installation

Belt Storage and Installation

The methods of storing and handling Conveyor Belting

and the procedures for tensioning it before making

the final splice are just as important as actually making

the splice.

New conveyor belting should be stored upright in the

factory package until used. A cool dry room, free from

sunlight, steam pipes, oil and corrosive fumes is best.

Under no circumstances should a roll of belting be

stored on its side, even if on a concrete floor.

Moisture will shrink any exposed fabric that gets damp

from such storage and the belt may “bow” on one edge.

Storage of rolls in an upright position on a dry floor is

preferred. If long-term outside storage is necessary, the

lay-down area should be prepared by placing matting

or other material to protect the belt from sharp objects.

If long-term storage outside (more than one year)

is necessary, the belt must be covered with a suitable

material such as a tarpaulin or heavy pigmented

plastic sheeting. This will protect the belt from the

effects of weathering.

Handling the Roll of Conveyor Belt

Conveyor belts should never be dropped while unloading

from a freight car, truck or other means of transportation.

Due to their weight, dropping rolls can break the

packaging and may damage the belt.

Belts should never be rolled or skidded. Provisions should

be made to use proper moving equipment. Care must be

taken when hoisting a conveyor belt to prevent damaging

the edges. Insert a bar through the center of the roll and

lift with cords or chains attached to a spreader (Fig. 2-1).

Once the roll of belting has been transported to the

installation area, it should be mounted on a suitable shaft

for unrolling and stringing onto the conveyor system.

Conveyor belting may be rolled at the factory with the

carrying side out or in depending on customer requests.

Typically the carry side is rolled at the outside.

Consequently, in mounting the roll, the belt must lead off

the top of the roll if it is being pulled onto the troughing or

carrying idlers but off the bottom of the roll if it is being

pulled onto the return idlers. However, if the carry side of

the belt is rolled to the inside then the belt will be pulled

off in the opposite manner.

Fig. 2-2 illustrates a suitable method of mounting a belt

with the carrying side out and leading off the top of the

roll when pulling onto the troughing idlers.

To prevent the belt roll from over-running at the let off, a

braking device is recommended (Fig. 2-3).

Fig. 2-2

Note: Temporary flat

roll at bend point, as

roll is pulled onto

troughing idlers.

Fig. 2-3

Let-off System with Brake

Square to Round Shaft

Band Brake Material

Tensioning Means

Let-off Stands

Fig. 2-1: Proper Belt Handling

Conveyor Belt

Fabric Splice Manual

Conveyor Belt

Fabric Splice Manual