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Filter cloth can seperate liquids and solids, it plays an important role in the liquid filtration area. Here is the introducition of the common use filter cloth and how to choose them.

Polyester filter cloth

This product is considered to be the world of filter cloth ‘acid-resistant little master’, the temperature of 130 ℃ or less casually used, occasionally soaring to 150 ℃ is also fine. It is divided into two kinds: one is the surface of the smooth filament models, breathable, fast filtration, suitable for the need for rapid treatment of the occasion; the other is a short-fibre models, the fibre wrapped tightly, can block the finer particles, but the breathability will be a little discount. Those belt filter presses in chemical and pharmaceutical factories love to use it, especially when dealing with acidic liquids.

Polypropylene filter cloth

To say that corrosion resistance, polypropylene can definitely rank the top three. Strong acid and alkali are not afraid, but the temperature can not exceed 90 ℃. Monofilament structure of the filter cloth surface is silde, the filter cake a raking off, suitable for high-flow filtration; compound filament structure is like a dense net, specifically to deal with fine particles. Coal washing plant, dye plant those plate and frame filter presses rely on it to live, especially when dealing with corrosive liquids, especially save.

Nylon filter cloth

The wear resistance of this filter cloth is really strong, mining coal washing, metal processing, these ‘hard core’ occasions rely on it to support. Although it can't withstand strong acids, it has no problem with weak acids and alkaline environments. Temperature and polyester is about the same, within 130 ℃ proper. Rubber factories also like to use it as a skeleton material, after all, good flexibility and resistance to manufacturing.

Vinylon filter cloth

Vinylon filter cloth is good in alkaline environments, but it wilts when it meets acid. Do not exceed 100 ℃, especially good water absorption is not easy to deform, ceramic factories, pharmaceutical factories to deal with alkaline liquids commonly use it. 

Non-woven filter felt cloth

The nonwoven needle felt cloth is directly made by meltblown fibres, needled into a three-dimensional honeycomb structure, even particles below 1 micron can be caught. The polyester or polypropylene substrate is heat-set and the surface is as smooth as wax. It is indispensable for breweries to clarify wort and electronic factories to purify water systems, and the filtration accuracy of belt filters is directly pulled up to full when they are equipped with this thing.

Filter cloth selection guide: 

First, look at the acidity of the liquid (such as strong acid choice of polypropylene), then look at the working temperature (high temperature choice of polyester/non-woven), and finally look at the size of the particles (fine powder choice of non-woven). Of course, we also have to consider the type of equipment - belt filter presses love polyester filament, plate and frame filter presses prefer polypropylene filament, and vacuum drum machines are more compatible with non-woven filter felts!