An Introduction to Hot Air Through Bonded Nonwovens, Spunbond Nonwovens and Spunlace Nonwovens

Nonwoven Fabrics, as a versatile category of materials, have penetrated various fields of daily life and industrial production, thanks to their flexible manufacturing processes and diverse performance characteristics. Among them, hot air through bonded nonwovens (commonly known ashot air fabrics), spunbond nonwovens and spunlace nonwovens are three representative types, each with unique production principles, properties and application scenarios.

Hot air through bonded nonwovensare manufactured by a distinctive thermal bonding method. First, polymer fibers such as polyester or polypropylene are laid into a uniform fiber web. Then, hot air is blown through the web at a controlled temperature and speed. The heat softens the surface of the fibers, and under the combined action of heat and pressure, the fibers fuse with each other at the contact points, thus forming a cohesive fabric after cooling and shaping. The most prominent features of hot air fabrics are their excellent softness, breathability and bulkiness. They feel light and comfortable against the skin, making them ideal for products that require a high degree of comfort. Common applications include the inner layers of baby diapers, Sanitary Napkins, facial masks, and warm filler materials for lightweight clothing.

Spunbond nonwovens are produced by a one-step process that integrates fiber spinning and web formation. Molten polymer is extruded through the spinnerets of a spinning machine to form continuous filaments. These filaments are then drawn and laid onto a conveyor belt to form a fiber web, which is subsequently bonded by thermal, chemical or mechanical means. Thermal bonding is the most widely used method for spunbond fabrics. The key advantages of spunbond nonwovens lie in their high strength, good dimensional stability and cost-effectiveness. Compared with hot air fabrics, they are tougher and more resistant to tearing, making them suitable for applications that demand durability. Their application scope covers a wide range of fields, including the outer layers of protective masks, disposable surgical gowns, packaging materials, agricultural mulch films, and the backing materials of carpets.

Spunlace nonwovens, also called hydroentangled nonwovens, adopt a mechanical bonding technology that is different from thermal or chemical bonding. The production process involves laying short fibers or continuous filaments into a web, and then subjecting the web to high-pressure water jets. The high-speed water jets impact the fiber web, causing the fibers to interlock and entangle with each other, which imparts strength and integrity to the fabric. Since no chemical adhesives or high-temperature treatment are involved in the production, spunlace nonwovens retain the inherent softness of the fibers and are environmentally friendly. They also have good water absorption and lint-free properties. These characteristics make them a preferred material for disposable wipes, wet wipes, household cleaning cloths, medical gauze substitutes, and the surface layers of high-end hygiene products.

In summary, hot air fabrics, spunbond nonwovens and spunlace nonwovens each have their own strengths. Hot air fabrics excel in comfort and breathability, spunbond nonwovens stand out for their strength and cost advantage, and spunlace nonwovens are favored for their eco-friendliness and water absorption. With the continuous innovation of nonwoven technology, these three types of fabrics will continue to expand their application boundaries, providing more high-quality material solutions for various industries.