Fabric Treatment 

Fabrics are usually pretreated to improve their mechanical and dimensional stability. They can be treated with silicone to give them better cake release properties. Natural fabrics (wool and cotton) are usually preshrunk to eliminate bag shrinkage during operation. Both synthetic and natural fabrics usually undergo processes such as calendering, napping, singeing, glazing, or coating.

These processes increase fabric life, improve dimensional stability (so that the bags retain their shape or fit after long use), and facilitate bag cleaning.