1, Densely planted sand belts and sparsely planted sand belts

The densely planted abrasive belt is also called the closed coated abrasive belt.

The abrasives particles are closely connected to each other, and the entire surface of the substrate is covered. So there is no obvious gap between the abrasives.

The densely planted belt is mainly used for difficult grinding processes, such as heavy-duty grinding and powerful grinding..

Sparse-planted abrasive belts are often called open-coated abrasive belts.

The abrasive grains are arranged at a predetermined distance, and there are obvious gaps between individual abrasive grains.

Normally, the abrasive grains should generally cover 50%-70% of the substrate surface.

The sparsely planted belt has good flexibility, and the gaps between the abrasive grains can reduce the clogging of abrasive debris when grinding.

 2, Dry scrub belt and wet scrub sanding belt

Dry film abrasive belts are widely used. Because abrasive belt grinding is a kind of “cold state” grinding, usually it does not need the coolant to prevent burning on the workpiece.

Dry abrasive belts can not be used in wet grinding, because the bond used in it is easily compatible with water or other media, losing adhesion, causing abrasive particles to fall off.

So that the durability of the abrasive belt is much reduced, and the processing quality will be seriously affected.

In contrast, the wet abrasive belt is used for grinding with coolant, and it can also be used for dry grinding. It needs to use water-resistant synthetic resin as the primer, and it also needs to use water-resistant adhesive to resist the erosion of the coolant.

Grinding with a wet abrasive belt can reduce the heat of the workpiece, avoid thermal burns reduce thermal stress, and improve the surface quality of the workpiece.