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Filter Bag Fiber Characteristics

As a general rule, Pulse Jet and Plenum Pulse cleaning systems utilize needle felt medias, while Shaker and Reverse Air systems use woven medias. Medias are manufactured from a variety of man-made fibers and are selected based on a number of factors including: operating temperature, chemical components in the dust stream, abrasiveness of the dust being handled as well as other characteristics of the particular systems usage.

 A number of treatments are available to improve dust discharge on the cleaning cycle, improve the filter efficiency of the media, to add flame retardant qualities and other specialized applications.

FIBER

FELT

COMMENTS

mechanical property

chemical stability

 

hydrolysis stability

flame resistance

temp

 

 

 

Abrasion resistance

Breaking

resistance

inorganic acid

organic acid

Alkali

fluridizer

organic solvent

 

 

 

Polypropylene

 

Polypropylene exhibits excellent resistance to acids, alkalis and hydrolysis, but is susceptible to attack from oxidising agents such as H2O2

1

1

1

2

1

3

2

1

3

90

Polyester

 

Sensitive to hydrolysis brought on by moisture, particularly in the presence of acids and alkalis

1

1

2

2

3

2

3

3

3

150

Antistatic(white color fiber)  




 

Polyester blend Anitstatic fiber treatment

1

1

2

2

3

2

3

3

3

150

Homo Acrylic

Good resistance to acids, alkalis and hydrolysis, but not physically strong

2

2

1

1

1

2

1

1

3

140

PPS



 

 

The biggest weakness of PPS is oxidising agents with high temperature, the higher the temperature, the lower the O2 level must be. It almost behaves like a high temperature polypropylene

2

2

1

1

2

4

1

1

1

190

Meta-Aramid





Susceptible to hydrolysis, particularly in hot acid environments such as power generation, but is often used in “inappropriate” applications where it can be cost effective

1

1

3

2

3

2

2

3

3

204

Polyimide (P84)

 

Similar weaknesses to meta aramids, but exhibits them at up to around 30 degrees hotter

2

2

2

1

2

2

1

2

1

260

PTFE

 

 

 

Chemically the best fibre, has few limitations, almost always withstands the environment.

3

3

1

1

1

1

1

1

1

260

Non-Alkali glass fiber

 

Finishes limit maximum temperature range, good electric insulation

2

4

3

3

4

4

2

1

1

300

Superfine glass fiber

 

Dia.<4um Finishes limit maximum temperature range, good electric insulation

2

3

3

3

4

4

2

1

1

300

 

 

 

 

 

 

 

 

 

 

 

 

 

 Note for above table: 1, 2, 3, 4, mean the characteristics of the fiber Good, fine, general, bad.

A plain fabric is unfinished. A filter fabric is finished so that it can withstand various conditions such as moisture and abrasion.

Singed

Exposing the fabric to an open flame to burn off any loose fibers. Improves dust cake formation

Eggshell

Similar to a singed treatment, but pressure is applied to produce a smoother surface

Glazed

Like a singed and eggshell treatment, but more pressure is applied to produce a high-sheen surface

Acrylic Coated

Proprietary smooth, non-fibrous, mecropermeable coating with excellent dust cake release and improved resistance to bonding

PTFE liquid dipping

Easiler treatment for waterproof

Membrane

Membrane provides an extremely smooth, high efficiency finish, which makes it easier to clean sticky or very fine dust from the fabric and reduces the required cleaning frequency

Flame Retardant

Not flame proof, but provides a self extinguishing freature that is used when sparkes are involved, such as grinding

 

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