Industrial textiles ppt

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Industrial textiles ppt

  1. 1. Finishing Treatment for Filtration 09TT27 Industrial Textiles Presentation I S.Dhandapani – 11MT62
  2. 2. Finishing treatment • Fabric stability • Filtration collection efficiency • Dust release • Resistance to damage from moisture and chemical agents
  3. 3. Mechanical Treatments – Heat setting  Improved Stability is essential in order to prevent shrinkage during use.  Such shrinkage may be caused by the relaxation to tension imposed on fiber and yarns during manufacture.  As heat is the primary cause of shrinkage, it is logical that fabric stability should be achieved by thermal means.  Increase the density of the structure through increased fiber consolidation.
  4. 4. Mechanical Treatments – Heat setting  Heat setting
  5. 5. Mechanical Treatments – Singeing  Filter fabrics produced from short staple fibers, invariably possess surfaces with protruding fiber ends.  Such protrusions may inhibit cake release by clinging to the dust,it is common practice to remove them, this is achieved by singeing.  He process which the fabric passed at relatively high speed ,over a naked gas flame or over heated copper plate.
  6. 6. Mechanical Treatments – Singeing  The heat of the flame causes the fibers to contact to the surface of the fabric where, in the case of thermoplastic fibers.  Singing conditions will normally be adjusted according to polymer type and the intensity required by either the end-use application ot the individual manufacture’s preference.
  7. 7. Mechanical Treatments – Raising  Singeing process is designed to denude the fabric of its protruding fibers.  He raising process is designed actually to create a fibrous surface, normally on the outlet side of the filter sleeve.  To enhance the fabric’s dust collection capability.  This process is designed essentially for woven fabrics comprising staple fiber yarns at least in the weft direction.
  8. 8. Mechanical Treatments – Raising  In this operation the fabric is pulled over a series of rotating rollers termed ‘pile’ and ‘counter pile ‘  The cylinder rotates the pile rollers raise the fiber proud of the surface whereas the counter oile roller stroke them into a more orderly fashion.  Raised fabrics may comprise 100% staple fiber yarn  Smooth surface provided by the multifilaments will aid cake release whilst the raised staple yarns on the reverse side will enhance particle collection efficiency.
  9. 9. Mechanical Treatments – Calendering

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