Knowledge

Thermal bonding is a technology to produce non woven fabric same as needle punch non woven fabric, spunbond, spunlace. The main raw material is PET, PP, PA, natural fiber and so on. There are several thermal bonding systems in use:

Calendar bonding

Through-air thermal bonding

Drum and blanket systems

Sonic bonding

In thermal bonding process, fiber can be bonded together when reached melt point. Thermal bonding non woven fabric with good performance is more popular than chemical bonding. The advantages of thermal bonding non woven fabrics are as bellowed:

1. low weight. For example, our factory can produce the lowest weight is 16gsm

2. The cloth can be puffy with good hand feeling or bonded into hard hand feeling

3. There is no harmful substances, stable performance, no bad smell, be good for skin

4. Anti - aging antibacterial mold, anti - corrosion guarantee the health and the environment.

The process of using a calender for bonding non woven. The fiber is opened and fed into the web former. From the web former, the web is delivered into conveyor, which delivered into the calender rolls. In most conditions, point bonding by embossed rolls is the better way, which can add softness and flexibility of the fabric. Smooth rolls provide bonding flat fabric, which can add strength but reduce drapability and softness.

Another way of thermal bonding is using through air ovens. The operation is very easy, it can be easily changed the weight and lofts. The weight and thickness of web decide the length of time in the oven. More time is need if the web is thicker, because the heat need to penetrate to center of the web.