Controlling the quality of spunbond nonwoven interlinings: a complex and meticulous process exploration

In the vast field of the textile industry, spunbond nonwoven interlinings have become an indispensable part with their unique properties and wide application areas. However, it is not easy to produce high-quality and stable spunbond nonwoven interlinings. It is a complex and meticulous process involving precise control and technical optimization of multiple links.

Extrusion and stretching, as the starting stage of spunbond nonwoven interlining production, play a decisive role in the quality of the entire product. During the extrusion process, the polymer material is melted and extruded at high temperature. In order to obtain the ideal continuous filament, the extrusion temperature, speed and pressure need to be strictly controlled. Too high temperature may cause polymer degradation, while too low temperature will affect the fluidity and uniformity of the extrudate. Similarly, unstable extrusion speed will lead to uneven thickness of the filaments, affecting subsequent processing and product quality. Pressure control is related to the flow state of the melt and extrusion efficiency.

The subsequent stretching process is a key step in giving the filament strength and elasticity. The selection of the stretch ratio is crucial, and it needs to be determined according to the type of polymer and the required physical properties. The appropriate stretching ratio can orient the filament molecular chain in the stretching direction, thereby improving its strength and elastic modulus. However, excessive stretching may cause the filament to break, while insufficient stretching cannot achieve the desired effect.

The laying of the fiber web is the basis for converting the filament into a non-woven fabric. This step requires that the filament is laid into a web evenly and without defects. The thickness, density and uniformity of the fiber web directly determine the physical properties and appearance quality of the final product. During the laying process, defects such as creases and breaks must be avoided, which will not only affect the aesthetics of the product, but also reduce its service life and performance.

Bonding and reinforcement are the key links in converting the fiber web into a stable non-woven fabric. Thermal bonding, chemical bonding and mechanical reinforcement are commonly used methods. Thermal bonding melts the fibers in the fiber web and bonds them to each other by heating. This method is simple and efficient, but requires strict control of the bonding temperature, time and pressure to avoid fiber degradation or insufficient bonding caused by overheating. Chemical bonding uses chemical adhesives to bond the fibers together. This method can provide a wider range of bonding options, but the amount and distribution of adhesives need to be controlled to avoid affecting the feel and breathability of the fabric. Mechanical reinforcement is to entangle and tightly combine the fibers through needle punching, spunlace and other methods. This method is suitable for the production of thicker non-woven fabrics.

The post-processing stage is a key step for the final beautification and performance improvement of the finished product. Calendering can make the surface of the non-woven fabric smoother and glossier; curling can increase the softness and three-dimensional sense of the product; cutting is to cut the non-woven fabric into a suitable size and shape according to customer needs. These post-processing steps not only improve the appearance quality of the product, but also enhance its performance, such as wear resistance and tear resistance.

Controlling the quality of spunbond non-woven interlining is a complex and meticulous process. From extrusion and stretching, fiber web laying to bonding and reinforcement, and post-processing, each link requires precise technical control and continuous optimization and innovation. Only in this way can high-quality and stable performance spunbond non-woven interlining be produced to meet the growing market demand.