Bag filters

TECHNI FILTRATION SPRL

Le Spécialiste en Filtration Industrielle

Bag filters

Applications of bag filters are vast and numerous. Prefiltering operations up to a certain level of security or clarification filtration are done on bags.

Many industrial fields are user, such as food processing, chemicals, cosmetics, surface treatment, water treatment ...

All our bags are made with great care and with high quality products as well the media, the handle, the ring and the accessories.

Our references below correspond to the standard filter housings. But bags outside standard size and dimensions can also be made like flat bags, bags with round bottom, bags with tripled layers .

Bags are usually available in 4 standard sizes see tabel hereunder. The media is of 2 types : monofilament or felt . Media materials are mainly : polypropylene, nylon, polyester, polyamide , ...

Bags can may be provided with handles to facilitate the change by the operator. The seam should be of a high quality to prevent tearing during the start up (under pressure)

The chemical compatibility of the liquid to be filtered with the media should always be verified. Bags sweep filtration cut off from 1 to 1000 µm. Felt bags provide finer filtration than monofilament bags.

The bag can be seamed or thermally welded on the ring. The ring is usually available in Zinc coated , stainless steel or also in polypropylene

The volume reducer is placed within the bag. It reduces the volum of the liquid lost in the bag during the change .

The filterhousing can be fitted with a basket to prevent a possible tear of the baf when the pressure difference is great.

Diagram of the pressure losses depending on the flow and filtration cut Off for a bag size 1

Media

Cut Off

Size

Ring

- Monofilament PP

- Felt PP

- Felt PE

- from 5 till 1000 µm

for monofilament

- from 1 till 200 µm

for felt

- 1 : Ø7"×16.5" 2.3ft² : 90 GPM

- 2 : Ø7"× 32" 4.7ft² : 200 GPM

- 3 : Ø4"× 8" 0.7ft² : 25 GPM

- 4 : Ø4"× 14" 1.2ft² : 45 GPM

- Autres tailles spéciales ou

sur mesure disponibles

- seamed /

welded

- zinc /

Stainless /

plastic

* Not complete

Some applications require bags with higher performance as :

- bags designed for oil absorption

- bags type "extented life" with a longer lifetime

- high temperature bags

These bags offer an outstanding performance on a wide range and large particles, sizes and irregular shapes.

It's the layer prefilter that can capture these particles without that any overloading happens at the area by this fact this type of bag can guarantee a life double of a simple felt bag.

These bags are mainly used in the chemical industry, automobiles, such as for the filtration of resins, etc..of oil.

Filter basket

Filter baskets are of varying sizes, standard and specific design, they can be smooth, folded, glued and welded also.

Construction can so well be in stainless steel 304 or 316.

As for the filter medium it ranges from the simple perforated metal sheet woven or non-woven . The filter baskets are realisable for filtration cut off from 3 µm to a few mm.