In accordance with BS 490, DIN 22102 & SABS 1173-2C, covers of natural or synthetic rubber are designed to protect the carcass from abrasion, impact, deterioration and other injurious influences. They are compounded to meet particular service conditions such as abrasion, oil, heat, fire, chemical resistant, antistatic etc.
The carcass of a belt maintains the belt tension and supplies structural strength, it does all the work in supporting the pulley load. The carcass consists of multiple piles of rubber impregnated fabric, bonded together with friction and skim coats. The fabrics most commonly used are nylon and polyester.
Rubber Skim Coats
An extra layer compounded between piles that increase flex life and creates a more elastic link, to which the fabric anchors firmly, so that piles flex without separation. Generous interply skim rubber aids impact absorption.
A special woven fabric placed between the cover and the carcass is to improve impact resistance, load support and tearing.
General Purpose Conveyor Belt
This image shows a typical conveyor belt construction conforming with international specifications. The all synthetic fabric in the carcass is skim coated with a cushioning layer of rubber.
Two cover qualities are available:
- Rubber covers suitable for the conveyance of abrasive materials under average working conditions.
- Rubber covers suitable for the conveyance of extremely sharp and abrasive materials under severe working conditions.
Conveyor belting is classified according to the minimum full thickness breaking
strength of the finished belting in kilo-newtons per meter of width in accordance with BS.490, DIN22102.
The ratio between the top cover and bottom cover gauge must be less than the maximum in the table to prevent belt curl.