In needlefelt manufacturing, the heat setting process is a crucial step that helps to stabilize and strengthen the fabric. After the initial needle punching process, where loose fibers are mechanically interlocked, the fabric is subjected to heat and pressure to set the fibers in place in order to increase its strength, dimensional stability, and resistance to stretching or shrinking.
The heat setting process typically involves passing the needlefelt through a series of heated rollers or ovens that have precise temperature control. The fabric is carefully guided through these heat sources while maintaining tension to prevent excessive shrinkage or distortion.
The temperature and duration of the heat setting process depend on factors such as the types of fiber used, and desired filtration characteristics. It is important to carefully set the temperature and time to ensure that the fibers are adequately bonded together without damaging the fabric.