In respect of equipment considerations the ideal filter belt screen, in simplistic terms, provide a long trouble-free performance. In other words, it will provide resistance to stretch, structural deformation, flex fatigue and mechanical abrasive forces.
 
The tendency for filter belt screen stretch may arise in several types of filter, e.g. in conventional filter presses and in both pressure and vacuum leaf filters it may occur due to the vertical pull of heavy filter cakes on the cloth during the discharge phase. On the other hand, on horizontal belt filters and in vertical automatic filter presses, it may occur as a result of filter belt screen tensioning forces, especially on start up.
 
In conventional filter presses such stretch may, in extreme cases, result in the port holes in the cloth being pulled out of alignment with the holes in the filter plate, thereby impeding filtrate escape. By comparison in vertical automatic presses, if the belt stretches to the limit of the filter’s tensioning stroke, then the filter will have to be stopped with consequent losses in production whilst the belt is shortened and re-seamed.
 
In other vacuum filters, such as disc and certain rotary drum filters, stretch may result from the repeated injection of compresses air which, at the end of the filtration cycle, is used to used assist discharge by inflating the cloth and thereby ”easing” the cake away from it. In extreme cases, this could also result in mechanical damage to the filter belt screen as the inflated cloth engages with the filter’s scraper blade.

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: filter belt screen