| 摘要 |
PURPOSE: An asymmetric porosity sheet is provided to satisfy suitable physical properties as an air filter for coordination. CONSTITUTION: A coating solution containing fluorine resin is coated or dipped on a laminated non-woven fabric arranged in multi-layered structure to have an asymmetric density gradient. The laminated non-woven fabric comprises two different kinds of non-woven fabrics having different densities, and satisfies 0.2-0.6 g/cm^3 of density and 100-500μm of thickness. The non-woven fabric is fabric selected among poly ethylene, polypropylene, polyester, and a mixture of them. |
