General information
In a lifting belt, the carcass is of prime importance because it is required to have high mechanical strength, low elongation (e.g. in the order of 0.25% to 10% of the reference tension), high fatigue resistance and high tear resistance.
The carcasses, also sometimes referred to as gourds , are fixed to the belt by bolt systems, which must prevent a concentration of stresses that could cause the carcass to break.
The carcass of Alcatruzes belts can be made of cotton canvas, mixed canvas, polyester/polyamide canvas or, preferably, polyester/polyester canvas and, finally, steel cord canvas of the SW type (two wefts in steel cord).
The strength class of these types of belts generally ranges from 250 N/mm to 2500N/mm and they are manufactured in widths of between 200 and 2000 mm.
The coatings must be suitable for the materials to be transported and their quality is identical to that of the coatings used on other types of belts. Because they are less important in this type of application, their thickness is generally lower: 2 to 3 mm on the face and 1.5 to 2 mm on the back for textile-reinforced belts and 3 to 5 mm on the face and back for steel cord-reinforced belts (with equal thickness on both sides).
