Textile Belt Splicing

Elastomers Compounding Processing

Standards /norms Equations Steel cords Inches / mm US dimensions Papers

Handling/Storage Reel dimensions Stringing Textile belt splices Textile belt splicing Steel cord belt splices Steel cord belt splicing Splice testing

First belt Strongest belt Strongest underground belt Highest capacity belt Longest belt Heaviest belt First self-extinguishing belt

Belt designation Carcass types Cover grades Elastomers Glossary of terms

Rip detection Splice length monitoring Opto-electronic monitoring Conveyor safety devices

Closed conveyor belts Energy saving belts Aramid belts

INSTALLATION

TEXTILE CONVEYOR BELT SPLICING (Multiply) - STEP BY STEP
1.		On both belt ends a chalk line will be applied for the belt centre line (the rectangular datum lines, as well as the marking lines of the splice). For determining the centre line, 3 centre points at intervals of ~2 m will be marked.
2.		The fist step of the splice should be in the bottom side and the first to touch the drive pulley.
3.		Both partial lengths will be put one on top of the other along the whole splice length. The lower part of the portable heating press is used as a working table. For positioning the bottom platens of the press both belt ends will be folded back.

The splice length will be transferred to the combined rubber sheeting and the splice edge will be placed to the lower splice edge of the second belt end. In accordance with the rectangular datum line it will be checked parallelly and diagonally whether the alignment is correct. If not it will be readjusted.

Combined rubber sheeting will be tapped with a mallet.

Cut with a knife at a 30° angle down to the fabric.

The rubber covers both of carrying and running sides of both belt ends will be removed ("stripped off").
In the rubber cover on the carrying side along the inner splice line marking, cut with a knife held at a 30° angle until it gets down to the fabric.
The rubber edge of the belt will be removed.
For stripping the rubber cover, continuous strokes with a special knife with grip tongues are used.
The rubber will be removed down to the fabric. Tearing it off is not permitted.

For cutting the plies a special ply knife is used. This knife prevents damage to the ply underneath.

Splice edges of the carrying and pulley side of both belt ends will be roughened with a wire brush.

7.		The textile plies are coated with rubber solution by means of a brush or a spatula. Let dry well! See also handling and storage of splicing material.
8.		An unvulcanized rubber sheet will be put on the fabric. To avoid air inclusions a hand-roller is used. The alignment of both belt ends is controlled by means of a string across the three marked centre dots. A chalk line will be marked and rubber edges will be trimmed off.
9.		Between the lower heating platen and the bottom rubber cover, Vulcatrix cloth is placed across the whole splice area. Edge bars will be placed at both sides of the belt and fastened with edge clamps outside the splice area. The edge bars will be approximately 1-2 mm thinner than the belt itself.
10.		Between the lower heating plate and the bottom rubber cover, Vulcatrix is placed across the whole splicing area. Vulcatrix cloth should be longer in both longitudinal directions and at least 50 mm larger than the splice itself.
11.		The upper plates are placed and aligned. The upper traverses will be placed in a way that both end traverses are positioned outside the splice area. The end locking bolts are positioned and tightened slightly. The oil pumps are connected to the upper traverses. The end bolts are tightened thoroughly. The electrical cables are connected to the heating platens. A pressure of ~10 bar is applied with oil pump. The heating platens are plugged in. The pressure is increased as temperature rises. Temperatures at all heating plates to be controlled. The temperature is adjusted by switching energy on and off. After several minutes allow temperature to rise to 142° C. The curing time counts when temperature reaches 142 ° C. Disconnect at 145° C! Plug in again when temperature drops to 142°C! The curing time is determined according to belt thickness, i.e. 2,5 minutes per mm of belt thickness. After the curing time has elapsed, the platens are allowed to cool down to 60° C. The traverses and end bolts will be loosened and removed. The upper heating platens are removed. The edge clamps are loosened and the edge bars are removed. The spliced belt is lifted and the lower heating platens are removed. The working platform is removed. Rubber overflow at both edges is trimmed off. The belt surface, the ramps and the edges are inspected visually. The belt can be put into service.

TEXTILE CONVEYOR BELT SPLICING (Multiply) - STEP BY STEP