Non-woven fabrics are classified into three categories according to the processing method, namely the web-forming method: wet-laid non-woven fabrics, dry-laid non-woven fabrics and polymer direct web-forming methods. They are completely different in terms of materials, equipment and craftsmanship. The following will explain the difference between wet-laid non-woven fabrics and dry-laid non-woven fabrics.
1. The difference between wet-laid non-woven fabrics and dry-laid non-woven fabrics on the web
(1) Wet-laid web:
Using water as the medium, the short fibers are evenly suspended in the water, and by the action of the water flow, the fibers are deposited on the permeable curtain belt or porous drum to form a wet fiber web. That is, wet-laid non-woven fabrics are fiber webs made by dehydrating water, fibers and chemical auxiliaries in a special former, and non-woven fabrics obtained after physical and chemical methods are used to fix the web.
(2) Dry network formation:
It means that natural fibers or chemical short fibers are used to form fiber webs under dry conditions by mechanical, air flow, centrifugal force, etc., thereby forming non-woven fabrics.
2. The difference between wet-laid non-woven fabrics and dry-laid non-woven fabrics in raw materials
Most of the raw materials used in wet-laid non-woven fabrics are hygroscopic and are composed of naturally degradable fibers. The fiber length is generally 2-12mm. The equipment is a specific equipment that is transformed by technology using paper-making machinery, and the process is evolved from the paper-making technology process. The non-woven products produced by the wet process have strong variability, and the non-woven fabrics produced by the wet process have incomparable advantages with other processes: for example, the cloth surface is smooth and does not irritate the skin, the longitudinal and transverse strength differences are small, the tensile strength is balanced, and the density uniformity is good. It generates static electricity, etc. The biggest feature is that it is easy to discard and can be naturally degraded, which is beneficial to environmental protection.