Polyester plain fabric have open spaces around the fibers. The polyester plain fabric design used will depend on the intended application of the filter belt screen. The simplest weave is the plain weave. The yarn is woven over and under to form a checkerboard pattern. This weave is usually the tightest, having the smallest pore openings in the fabric. Consequently, it retains particles very quickly. This weave is not frequently used, because the bags tend to have a high pressure drop (even without any dust cake).

                                                                
Other weaves include the twill and sateen (satin). In the twill weave, yarn is woven over two and under one for a 2/1 twill and over three and under one for a 3/1 twill weave.

                             
The twill weave does not retain particles as well as the plain weave, but does not tend to blind as fast. Bag blinding is a condition where the particles (dust) becomes embedded in the filter over time and are not removed by the bag cleaning process. The twill weave allows good flow rates through the filter and high resistance to abrasion. In the satin weave, yarn is woven over one and under four in both directions. Satin weave does not retain particles as well as the plain twill weave, but has the best (easiest) cake release when the polyester plain fabric is cleaned.

                                                            
Different weaving patterns increase or decrease the open spaces between the fibers. This will affect both polyester plain fabric strength and permeability. Fabric permeability affects the amount of air passing through the filter at a specified pressure drop. A tight weave, for instance, has low permeability and is better for the capture of small particles at the cost of increased pressure drop.

The true filtering surface for the polyester plain fabric is not the bag itself, but the dust layer or filter cake. The bag simply provides the surface for capture of larger particles. Particles are collected by impaction or interception as the open areas in the weave are closed. This process is referred to as sieving. Some particles escape through the filter until the cake is formed. Once the cake builds up, effective filtering will occur until the bag becomes plugged and cleaning is required. At this point, the pressure drop will be exceedingly high and filtering will no longer be cost effective. The effective filtering time will vary from approximately 15 to 20 minutes to as long as a number of hours, depending on the concentration of particulate matter in the gas stream.

Anna
Position: sales
Hebei Defeng Polyester Fiber Co., Ltd
Add: Jingjiu Railway west, wugong town, Raoyang County
TEL: 86-311-67699480
FAX: 86-311-67699480
Website: www.china-polyestermesh.com
E-mail:anna@china-polyestermesh.com

Tag: polyester plain fabric, filter belt screen