How can non-woven fabrics achieve high quality
In order to achieve and maintain the required quality control when producing nonwoven composites, it is critical to have a deep understanding of the control process and turn it into an advantage. Let's take a look.
How to ensure the highest quality control of the compounding process?
There are only a few processes that really determine the quality of the final non-woven composite material, which must be strictly controlled, mainly the application of tension, temperature, line pressure and adhesive.
Tension control
Web tension is the machine direction force (MD) exerted on the web. Tension is extremely important throughout the lamination process. When properly handling the web, the web must always be pulled by the rollers, and it must not be under too much or too little tension.
Tension control is critical at all stages of web processing. In general, post-processing is divided into three distinct tension zones:
● Unwind
● processing
● Rewind
Each tension zone must be controlled independently, but must work in tandem with the other zones. The tension applied in each zone is different, depending on the torque of the rollers. The torque must be changed as the roll is unwound or unwound to maintain proper tension.
Temperature control
The temperature setting of the nonwoven lamination is critical to obtain a top quality product.
During hot melt adhesive compounding, the temperature of the adhesive layer needs to be precisely controlled, and the composite material needs to be cooled to avoid changing the properties of the composite material.
The thermal composite process requires high temperatures to exploit the thermoplasticity of one or more composite layers in the composite. The high temperature and pressure will melt the synthetic fiber layer enough to bond with the nonwoven fiber layer. However, the temperature setting must be precise. If the temperature is too low, it will not glue and it will not last. Conversely, if the temperature is too high, it can lead to the degradation of the material in the cloth layer, thereby affecting the structural integrity of the composite material.
