A METHOD FOR THE PREPARATION OF A PLA/PP BICOMPONENT FIBER FILTER MEDIA AND PRODUCTS THEREOF

摘要

This invention discloses a new method to prepare the PLA/PP bi-component fiber filter media and the products fabricated by using of PLA/PP bi-component fibers according to this method. The method includes the following processes: 1. The preparation of PLA carding fiber flow. The PLA fibers are fed into an air carding machine, and then an orderly carded PLA fiber flow is formed after the carding. 2. The preparation of melt-blown PP fiber flow. The PP raw material is first melted under the temperature of 180-290 °C in a screw extruder, and then the extruded PP melt is filtrated and transported to the metering pump. After measuring, the PP melt is conveyed to the spinneret die to spin the fibers. PP fibers are drawn under the hot air with the temperature up to 250~300 °C, which is added from the both sides of the spinneret hole. Therefore the melt-blown PP fiber flow would be formed. 3. The preparation of PLA/PP bi-component fiber filter media. The PLA air-carded fiber flow is combined with melt-blown PP fiber flow at the mass ratio of PLA: PP = 40~60%:85~15%. After cooling, a fiber web is formed on the collector. The formed fiber web on the collector could be directly shaped into PLA/PP bi-component fiber filter media by thermo-bonding which is due to the presence of surplus heat in PP fibers. The mixing ratio of PLA and PP fiber mentioned above could be controlled by adjusting the amount of the PLA fiber fed into air carding machine and the metering pump in PP melt-blown fiber process. The filter media could be prepared by this method.