Filtration media designs are becoming more complex in order to achieve ever increasing market demands for finer particle capture, increased dirt holding capacity and longer service intervals. Spunbond nonwoven fabrics are commonly used in these more advanced media designs to protect the relatively weak media layers during filter production, to provide structural support that can prevent damage to the media from pulsations and high operating pressures, and to minimize media fiber and particle shedding from contaminating the downstream system. The performance of the filter media is analogous to the "weakest link" concept and good performance is highly dependent on producing a uniform media structure. Uniform spunbond fabric substrates can also impact filter performance by improving the quality of synthetic media that is formed on the substrates; and by improving particle capture and retention in dynamic flow conditions.
Measuring the uniformity of the filament structure of spunbond nonwoven fabrics has been a challenge for the industry for many years. Visual observations of uniformity are subjective and cannot provide quantifiable or reproducible data that allows different spunbond fabrics to be compared. This presentation will examine two methods of numerically quantifying the uniformity of commonly used nylon and polyester spunbond fabrics and explore ways that greater spunbond uniformity can improve advanced filter media performance...
Session: F5 - Filter Media - Numerical Methods for Optimized Media Design II
Day: 14 March 2018
Time: 16:45 - 18:00 h