In the liquid and solution purification industry, various purification methods are used, the most common and useful of which is the filter press method. In this method, purification is done with the help of filter press device. This device performs purification with filter press cloth and plate. The device and plates will be described in other articles.

Considering the wide range of solutions for acidity and alkaline, density, high viscosity, and temperature, and different cloths and filters are used depending on the health of the liquid feed as well as the transparency and solution volume expected from the solution. Therefore, cloths and filters are made of different materials, such as polyester, polyamide (nylon), polypropylene and cotton (linen) or a combination thereof.

Cotton fabric cloths are used for high temperature and neutral solution and sometimes alkaline liquids. However, it is not used for pharmaceutical use because of its roughness in areas with higher sensitivity to health. This filter cloth can be used up to 5 atmospheres at low pressures depending on the number of curls per unit area and tissue type.

Therefore, when high pressure is needed for different reasons, restrictions are imposed on the use of these filter cloths.

Cotton cloth

Cotton and materials between them can be used with materials such as polystyrene. After these cloths are washed for warp, change the size between 2-5% and consider them for sewing and placement. In such glands, the air flow is to assume that the normal ventilation coverage and the hole openings in the gland are large or medium, which can be used to purify the liquid mixture with medium and large solids. means.

Polypropylene cloths are used even for acidic and alkaline solutions and even neutral solutions. Such cloths are resistant to temperatures of 110 ° C and are used in a wide range of solutions and industries. They are long to use and do not rot under humidity and temperature conditions. Also, the health check for your roughness is appropriate and used in the examination area. Durable and recyclable for washing and cake separation more.

Poly propylene cloth (pp)

The change in the size of these glands is very small and up to 3% before and after the filter presses. It is well resistant to corrosion and has a variety of ventilation.

The air passage unit is the passage of the amount of air from the area of ​​1 m ^ 2 in a certain time unit and under the water pressure of 10 mm milk.

Since these types of cloths are very textured and solid, it is difficult to provide sealing conditions and is not recommended where the solution is valuable. This type of cloth is produced in a wide range.

Polyester cloth (PE)

As they are made of polymer fabric, they are used for acidity and alkaline and neutral solutions. They are good for sealing because the propylene cloths also have the properties and are thick and soft, and they are produced in a single layer and two Layers resistant to high pressures. The two-ply type can withstand 20 atmosphere pressures.

Polyester cloth (PE) type temperature resistance can reach up to 1700C and its durability is good.

Polyamide cloth (Nylon)

These types of cloths are used in different environments and are good for sealing since they are soft.

In addition, cotton, polyester and polypropylene etc. are used to obtain different properties from cloths and use them in different industrial conditions. The component of fabrics is used with different textures.

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