1. Finishing Treatment for
Filtration
09TT27 Industrial Textiles
Presentation I
S.Dhandapani – 11MT62

2. Finishing treatment
• Fabric stability
• Filtration collection efficiency
• Dust release
• Resistance to damage from moisture and
chemical agents

4. 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.

5. Mechanical Treatments – Heat setting
 Heat setting

6. 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.

7. 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.

8. 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.

9. 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.

10. Mechanical Treatments – Calendering