2014 Buyers' Guide - Filtration News

Cartridge | FiltrationThe gel formulations within silicone sealants are called “gel balls”; they will cause bridging at the opening of the nozzle ofan applicator tip, which causes an inconsistent bead to be applied. Therefore, secondary processing is often required to addressthe removal of these formations.winding, yarn is locked in place by succeedinglayers. Solid particles are removedby entrapment with the mediato yield efficient depth filtration. Byvarying the wind pattern, conventionalwound cartridges are fabricated to givea predetermined micrometer rating.Among the factors that impact rovingquality are the diameters of its constituentfibers, its weight, and its twist.If tow fibers are impregnated witha thermosetting resin prior to the operation,resin bonded cartridges canbe fabricated. This resin impregnationmay be achieved by spraying, rollcoating, or immersion. However, theimmersion process requires nip rollersto squeeze the excess resin from thetow. The element is then heat cured inan oven to form a resin-bonded cartridge“log”. Upon removal of themandrel, the “log” can be cut into the28 • August 2013 • www.filtnews.comdesired lengths.In addition to low cost resultingfrom process simplicity and minimalcapital requirements, this process hasnumerous advantages. The overlappingof the tow during the winding operationcreates a rough, irregular surface.Consequently, the surface area of the elementis increased without the need forsubsequent grooving or grinding operationsthat can generate surface debris.