The definition of wet-laid non-woven fabric technology […]
The definition of wet-laid non-woven fabric technology is firstly divided from the raw materials: First, most of the wet-laid non-woven materials are naturally degradable.
1. The fiber length of wet-laid non-woven fabrics is mostly within 10mm, and there are special products within 20mm, but only a small amount is added. The fiber length for dry-laid non-woven fabrics is generally above 38mm, and there are special ones above 20mm, but only a small amount is added.
2. Wet-laid non-woven fabrics have different proportions of natural degradation function, while dry-laid non-woven fabrics can not be degraded naturally but only split.
Natural degradation and pyrolysis are not a concept. Natural degradation means that non-woven fabrics turn into saprophytes under natural conditions within a certain period of time and do not produce harmful substances that have an impact on the environment. And pyrolysis is the addition of degradable substances in the spinning process. In a certain period of time, through the influence of natural conditions, the fiber products will crack, and the actual chemical composition has not changed at all. The harmful substances still exist for a long time. Accumulated damage to soil and water sources can cause irreversible disasters.
3. Divided from fiber formation and shape setting, non-woven fabric production-general art is, feeding, carding (carding), netting (setting), curing (drying), etc. The key is that the wet-laid non-woven fabric is formed into a web (set shape) in a liquid (slurry), while the dry-laid non-woven fabric is completed under dry conditions. It is not that the web is impregnated with water, such as the spunlace process, and the impregnation process is also collectively referred to as wet-laid non-woven fabrics. In fact, this is a misunderstood term.