Study On The Process And Performance Of PTFE Needle-punched Filtration Material

In order to deal with the increasingly serious environmental problems,and continuously improve the country dust emission standard,the enterprise to acupuncture air filtration material performance put forward higher request.Pure PTFE filter material with its excellent corrosion resistance,oxidation resistant,high temperature resistant and easily to clean dust,such as performance,become the research focus of high temperature filtration material.But PTFE fiber electrostatic,gram weight is high,the web forming difficulties;Strengthening technology for acupuncture composite air filter material intermediate PTFE base cloth injury,will reduce filtration material strength,and reduce filtration material the use of life;At present the reinforcement technology for membrane crack PTFE needling composite air filter material impact the performance of less research,and how to improve the filtering material powerful premise,guarantee the filtration material filtration efficiency,also is the research direction;In addition to PTFE now acupuncture composite air filter material performance analysis is less,go against PTFE filter material of the actual application promotion.Based on this background,this paper focused on the research of film crack PTFE needling composite air filter material production process,and then put forward respectively based on acupuncture reinforcing technology on PTFE base cloth damage sex and filtering material fully performance research,as well as film crack PTFE acupuncture composite air filter material performance analysis.Hope that through these studies,to find the film crack PTFE fiber into network technology;The article proposes some appropriate process parameters of acupuncture reinforcing and reduce the base fabric damage,prolong the service life of the filtering material;Acupuncture research PTFE composite filter material performance,increase enterprise's understanding and application.This topic through the consulting a large number of literature patent material,field study filtering material production technology,the key to do the following four aspects:first of all,on membrane crack PTFE fiber,PTFE filament and PTFE base cloth of performance research,focus on film crack PTFE fiber electrostatic problem;Find out the film crack PTFE fiber into nets and the reasonable reinforcement ways,so that made of high performance film crack PTFE acupuncture composite air filter material.In the second place,the acupuncture needle depth,density,surface layer and the base cloth fiber network of warp/weft tight and PTFE base cloth damage relationship between research,and the vertical and horizontal strength loss rate to quantitatively characterize the damage degree of the base fabric,and the vertical and horizontal strength damage rate and absolute strength damage rate are compared and analyzed.Third,the study based on acupuncture reinforcing technology for membrane crack PTFE acupuncture composite air filter material appear a performance impact analysis.through the test to study the film crack PTFE needling composite air filter material corrosion resistance,temperature tolerance and dimensional stability,etc.This topic through the above research,draw the following conclusion:(1)through the experiment,it is known that the film crackPTFE fiber has big discrete fineness,good acid-proof alkaline,compared with other high temperature resistant fiber,strength is low;After antistatic agent processing,PTFE fiber can greatly reduce the quality of fiber than resistance;Through the contrast,it can be seen that PTFE fiber compared with airflow into the net is more suitable for carding web forming process;Through the water thorn reinforcement and acupuncture strengthening the base fabric strength damage rate is known,the water thorn reinforcement of the base fabric damage than acupuncture reinforcing.(2)through the study found,filter material strength is mainly composed of base cloth to provide,and based on acupuncture reinforcing the base cloth damage mainly because PTFE filament is the destruction of pricker,and damage depends on prod of barbs number,acupuncture dynamic range and acupuncture force,etc.;The base fabric damage performance in PTFE filament split branch bending,rather than fracture;Acupuncture depth and needle density increases,will lead to the base fabric damage degree deepening,and through the needling density changes to the base cloth of the powerful influence more;Fiber screen surface of the base fabric protect,and fiber surface and the higher the gram weight,thickness increased to a certain degree,can reduce the damage to the base fabric;1#base cloth of the filament diameter ratio 2#base cloth,breaking elongation ratio 2#little,so 1#base cloth strength loss rate than 2#base cloth strength loss rate,and with acupuncture density increases,the gap change big trend.(3)needling depth,needling density parameters of PTFE filtering material will appear a performance have a significant impact.With needling depth and needling density increased,filter felt volume density increase gradually,and the needling depth more influence.And permeability rate,porosity and average pore diameter are as needling depth decreases,with the increase of the density of needle is to reduce the tendency of increase after.(4)the results of the experiment indicated,PTFE needling compound filter material has very good acid-proof alkaline;In the 260 ? or so still has good strength retention and heat shrinkage rate,when to 280 ? will become very bad,it shows that PTFE acupuncture compound filter material best using temperature at 260 ? below.