Method for Making Polypropylene Nonwoven Fibers and Fabrics

摘要

A method for making nonwoven fabrics of fibers comprising one or more primary polypropylenes having a molecular weight distribution of less than 3.5 and a melt flow rate within the range from 5 to 500 dg/min, the fibers having an average diameter of less than 20 μm, or a denier (g/9000 m) of less than 2.0, thus forming propylene-based fabrics. The propylene-based fabrics may have a MD Tensile Strength (WSP 110.4 (05)) of greater than 20 N/5 cm when calendered at a temperature within the range from 110 to 150° C. Also, the fabrics may have a CD Tensile Strength (WSP 110.4 (05)) of greater than 10 N/5 cm when calendered at a temperature within the range from 110 to 150° C. The fabrics are preferably meltspun, and in particular may be spunbond fabrics.

主权项

1. A method of forming a fabric comprising meltspinning one or more primary polypropylenes at fiber forming velocities of greater than 3000 m/min to produce fibers having an average diameter of less than 20 μm, or an denier (g/9000 m) of less than 2.0, wherein the primary polypropylene has a molecular weight distribution of less than 3.5 and a melt flow rate within the range from 5 to 500 dg/min.