Finishing Treatment for Filtration

09TT27 Industrial TextilesPresentation I

S.Dhandapani – 11MT62

Finishing treatment

• Fabric stability

• Filtration collection efficiency

• Dust release

• Resistance to damage from moisture and chemical agents

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.

Mechanical Treatments – Heat setting

Heat setting

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.

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.

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.

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.

Mechanical Treatments – Calendering