Straight Ply Construction
This consists of straight laid plies extending across the width of the belt.
Stepped Ply Construction
This consists of an additional rubber cushioning in the center of the belt. A gap is left in first ply (1 step) or in first and second piles (2 steps) on carrying side and that gap is bled with extra rubber Dew to improve transverse flexibility.
Reverse stepped Ply Construction
This is just reverse of one stepped ply construction Pty gap remains on the sides and is filled with extra rubber where more flexibility is required on edges. Such belt has been descried for submerged ash handling installation in boller plants, that operates under water in a quenching tough. The thickness of rubber cover on back (I e bottom) is kept at 3.0/5.0 mm and on face (I e. top) at 1.5/2.0 mm for such type of belt. The reason being that the belt is dragged along to bottom of the quenching trough due to which the wear and tear on the bottom of the belt is higher than the lop. This belt is offered in cottom fabric 32oz. duck in 'Heat Resistant' and ‘H-Tex` cover grades in 4/2, 5/3 and 6/4 reversed stepped plies.
Breaker Ply Construction
This consists of 'leno weave' breaker that is laid over the carcass with cords running transversely across the belt to provide protection against longitudinal impact breaks and may be included in the top and or bottom covers. The breaker fabrics are also used in pairs where they are laid on opposing 45° angles for extra severe impact protection. The processed breaker adds about 1 mm to tie belt thickness.
Skim-Coated Piles
Piles may be skim coaled where service conditions are severe. An extra thickness of rubber coating may be inserted between the piles for improving inter-ply additions and or heat impact cushioning.
Edge Construction
HINDUSTAN All cotton conveyor belting is supplied in moulded edges to protect against edge wearing and prevent ingress of moisture, while all nylon conveyor belting can be supplied both in cut edges as well as in moulded edges. However, H.I.C. recommends a cut-edge construction due to complete rot resistance of the all-nylon belting.