Dust Bags

Dust bags by Lamports can be used for a variety of filter manufacturers in materials including, but not limited to, polyester, FRP, Teflon and cotton. All OEM bags - any shape, any size.

  

A Sketch of Polypropylene Textile Cloths

Thank you to by: Walter Senney, Met-Chem Group President and Lamports Filter Media

One of the most popular fibers used to manufacture fabric today is polypropylene. It can be woven into a variety of thread counts to allow from loose to tight filtration applications. Polypropylene is good for use in temperatures from 50°F to 180°F (Specification charts show use up to 250°F under limited applications is acceptable, (but I would not recommend it). The acceptable pH range for products filtered with polypropylene material is 2- 12.  Polypropylene can be woven in the following ways:

• Multi-filament uses a number of fibers rolled together prior to weaving the cloth.  This allows for a smooth finish and normally tight filtration. This cloth is normally used for filtration in pressure leaf filters for chemicals, liquid foods and some lower solids wastewater; as well as for anode bags in plating applications.
  
  
• Mono-filament uses a single fiber (like fishing line) to weave the cloth. This allows for a slick non-absorbing cloth that can be used in the same applications as multifilament, but is normally not as tight for filtration.  This type of cloth works well for screening and more open filtration applications.
  
  
• Mono/multi filament blend is a cloth woven out of both fibers, one is woven in one direction, while the other is woven in the other direction. This cloth can give us the best of both worlds in terms of tight filtration and a slick face for ease of cake removal. One of the major uses of this cloth is on filter presses for process filtration and heavy solid waste water applications.  
  
• Felt is the needle punching of these fibers into a thick material used regularly for filtration of paints, coolants and a variety of liquids. Micron ratings can go nominally from 1-100. These felts can be supported by an internal scrim or they can be non-supported.  The supported felts can hang from a ring to filter, while the non-supported must be put in a pressure vessel supported by a basket to avoid blowout. 

This is just a thumbnail sketch of polypropylene textile cloths. These cloths can filter “the birds or the worms” depending on the type and tightness of the weave.

 

Resistance Chart

I found a cool site with a fabric resistance chart:

Fiber	Tensile Strength	Abrasion Resistance	Chemical Resistance		Deg F		Deg C		PH
			Acid	Alkali	Cont.	Surge	Cont.	Surge
Polypropylene	Excellent	Good	Excellent	Excellent	190	190	90	90	2-12
Polyester	Excellent	Excellent	Good	Fair	275	325	135	150	2-7
Nylon	Excellent	Excellent	Poor	Excellent	200	250	90	120	2-8
Polyethylene	Good	Very Good	Excellent	Excellent	122	176	50	80	2-12
Cotton	Good	Average	Poor	Excellent	180	225	80	105	3-10
Nomex	Very Good	Very Good	Fair	Good	400	425	200	215	2-12
Teflon	Fair	Good	Excellent	Excellent	450	500	230	260	Any

NOTE: This table is only a general guide.  Operating temperature, chemical concentrations and mechanical conditions all have a pronounced effect on service life.

Sludge Bags Save Money and Space

Compared to (5) 55 gallon drums, the sludge disposal bag holds 27 cu. ft. of dried sludge! This makes it more cost effective to purchase, store (since it folds up when not in use) and ship as compared to conventional barrels.

Sludge bags receive sludge from filter presses, they are normally mounted under a filter press and sit on a skid with the top loops attached to the filter press chute. They are made of 6.5 oz. heavy woven polypro outer bag with a moisture resistant coating on the inside.  If necessary a separate inner polyethylene liner bag can be used to ensure a total leak-free bag.

 

What to do when your filter media is blinding and you can’t filter

In a perfect world filter cloth would hold the particles it's meant to filter and those particles would in turn help to filter the rest of the particles until the filter was full. However, that doesn't always happen. Sometimes the particles clog the material also known as "blinding the media". This results in your filter media no longer filtering.

There are a few reasons this might happen:

1. The Media itself might not be a good fit for your application. The weave may be too tight, or too loose, the material might be the problem and a mono/multifilament might be the answer. For more information on material choice >>
2. The media might need to be pre-coated prior to running the solution. The use of a porous "sludge" gets the media ready for the actual filtration of your media. To learn more about pre-coating >>
3. Similar to pre-coating, a process called Body Feed may be used. This take a porous material and mixes it with the media being filtered. Acting similarly to the pre-coat, this added material keeps the media from blinding. Learn more about body feed >>

 Although this may give you some good ideas, it is always best to consult an expert to help solve your filtration needs.

A Sketch of Polypropylene Textile Cloths

This is from our good friend Walter Senney, Met-Chem Group President

Although there are a lot of fibers to choose from, one of the most popular fibers used in manufacturing fabric today is polypropylene.

This versatile fiber can be woven into a variety of thread counts to allow from loose to tight filtration applications. It is good for use in temperatures from 50°F to 180°F  - Specification charts sometimes show it being use up to 250°F! However, Wally said he "would not recommend it" unless it was under specific circumstances.  Another benefit of polypropylene is it's acceptable pH can range all the way from 2- 12! Another major thumbs up  Polypropylene can be woven into a variety of cloth and cloth types allowing users to filter out the water or the baby!

Here's a little more information http://www.lamports.com/A-polypropylene.html

Or contact Lamports directly for assistance.

http://www.lamports.com/
Phone: (216) 881-2050
eMail: info@lamports.com
 

Lamports - Filter Cloth Replacement

When you decide to replace your filter press cloths you need to know there are three different kinds of cloths on a filter press:

• the head cloth, which is the first plate and is a single cloth with a hole in the center;
• the tail cloth, which is the last plate and is also a single cloth but with NO HOLE in the center;
• the intermediate cloths, which are all the cloths on the plates between the head and the tail. These are double cloths, with one on each side of each plate,

The hole in the center of each side is connected by a short cloth tube.

Be careful when putting the plates back into the filter press. There are two different types of plates. They are designated one button plates or three button plates. The plates can be identified by a drill hole that is about 1/4” deep, in the handle of the plate.

The one button will have one hole and the three button will have three holes. The head plate is usually a one button plate. The next plate MUST be a three button plate then a one button and so on. The filter press plate sequence is 1-3-1-3, and so on. If this order is not correct, the filter cake will not dry properly during the Blowdown process.

Contact Lamports Filter Media for additional information:

Phone: (216) 881-2050 
eMail: info@lamports.com

Lamports Filter Media

Lamports Filter Media as been in business since 1928. They specialise in high quality filter bags, filter cloths, filter discs and other engineered filter products. Their custom work provides exceptional quality for small and large runs. Their team are experts in the field of filtration and have extensive knowledge about the best materials to use as well as the best way to manufacture the actual filter.

Lamports Filter Media Products

• Filter Leaf Bags  

• Centrifuge Bags/Liners

• Belt Filters  

• Filter Press Cloths  

• Custom Filters  

• Dust Bags  

• Filter Paper & Discs  

• Replacement Filter Bags  

• Sludge Bags