SPLICING OF TEXTILE BELTS BY HOT VULCANIZATION
BANTSAN CONVEYOR
SPLICING OF TEXTILE BELTS BY HOT VULCANIZATION
The first step of the splice should be in the bottom side and the bottom side must be the first to touch the drive pulley.
Both partial lengths are put one on top of the other along the whole splice length. 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. 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”). Cut with a knife
held at a 30° angle until it gets
down to the fabric. 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.
The textile plies are coated with
rubber solution by means of a
brush or a spatula.
An unvulcanized rubber sheet is put on the fabric. To avoid air inclusions a handroller is used. A chalk line is marked and rubber edges are trimmed off.
Between the lower heating platen and the bottom rubber cover, cloth is placed across the whole splice area. Edge bars are placed at both sides of the belt and are fastened with edge clamps outside the splice area. The edge bars are approximately 1-2 mm thinner than the belt itself.
Mould heigh should be 1mm lower than belt thickness. Pressure is not applied immedietely after press in closed. Temperature should reach 70-800C. Then initail pressure is applied. Pressure increases gradually as temperature rises. After temperature reaches 145C, vulcanization begins. Belt should be held under pressure fort he duration of vulcanization at this temperature.