How does non-woven fabric achieve flame retardancy?

Non-woven fabrics are made of polyester fibers and can be used in different industries such as sound insulation, heat insulation, electric heaters, masks, clothing, medical and filling materials, etc. How does this non-woven fabric achieve flame retardancy?
There are two main ways to realize the flame retardant function of non-woven fabrics:
1. Through polymer polymerization, blending, copolymerization, composite spinning and graft modification, add flame retardants with flame retardant function to fibers. Preparation of fiber flame retardant.
2. Apply the flame retardant on the surface of the fabric or penetrate into the fabric through finishing.
The flame retardant effect of non-woven fabrics is achieved by adding flame retardants. For flame retardants used on nonwovens, they must meet the following conditions:
1. Low toxicity and durability, which can make the product meet the requirements of flame retardant standards;
2. It has good thermal stability and less smoke, which can meet the requirements of non-woven fabrics;
3. Do not significantly reduce the original performance of the non-woven fabric;
4. The price is very cheap, which helps to reduce the cost.
Non-woven fabrics are made of textile staple fibers or filaments, which are oriented or randomly arranged to form a network structure, which is then reinforced by mechanical, thermal bonding or chemical methods.