What are the requirements for the filter cloth of the plate and frame filter press?

As we all know, the filter cloth of the plate and frame filter press is matched with the plate and frame filter press and is widely used in the sludge dewatering industry. The filter cloth of plate and frame filter press is mainly made of polypropylene, polyester and nylon, and the common specifications and models are as follows: 1) Polypropylene:

750A, 750B, 750AB, 108C, 840AB, 305B, B3818, etc.; 2) Polyester, B758, B0303, etc.; 3) Nylon: B6533, B3015; Different materials and models of plate and frame filter press filter cloth have different air permeability, pore size, thickness and gram weight per square meter. If you have doubts about the choice of filter cloth model of plate and frame filter press, then it is recommended that you choose a regular filter cloth manufacturer for consultation.

Taking Bolian Filtration as an example, a company focusing on the R&D, customization and production of multi-type industrial filter cloths

First of all, the strength should be good and not easy to rot (many users complain about changing the filter cloth frequently); Secondly, the number of mesh of the filter cloth should be reasonable (the number of mesh refers to an important parameter of whether the filter cloth is sparse or dense), too much or too small can not achieve good results. To some extent, plate-and-frame filter presses are outdated, and many users turn to belt presses, which are efficient and durable. At present, there are many manufacturers of belt filter presses, and there are Guangzhou Lvda Environmental Protection Machinery and Jiangsu Lvwei Machinery.

This has a certain relationship with the filtration products, the filter cloth of the filter press has good filtration performance, has the characteristics of high transparency of the filtrate of the filter product, and can produce, plain filter cloth, twill filter cloth, satin filter cloth, non-woven filter cloth and other products.

<> plate and frame filter press.

The models are: shielded 450 type, 630 type, 800 type, 1000 type, 1250 type, 1500 type and so on. According to the working mode, the plate and frame filter press can be divided into manual plate and frame filter press, full self-macro and moving plate and frame filter press, semi-automatic plate and frame filter press, plate and frame pressure closed filter and so on.

It can also be distinguished according to its important component element - filter plate, the common one is polypropylene.

Plate and frame filter press, rubber plate and frame filter press, etc.

<> plate and frame filter press Kaiyuanxun machine models are: 450 type, 630 type, 800 type, 1000 type, 1250 type, 1500 type and so on. According to the working method, the plate and frame filter press can be divided into manual plate and frame filter press, automatic plate and frame filter press, semi-automatic plate and frame filter press, plate and frame filter press and so on.

It can also be distinguished according to its important component - filter plate, the common ones are polypropylene plate and frame filter press, rubber plate and frame filter press, etc.

<>1) The material of the filter cloth should be selected according to the chemical and physical properties of the material. Each filter cloth supplier provides detailed technical information as much as possible, which can be referred to and selected.

2) Select the permeability of the filter cloth (maximum interception particle size) according to the requirements of filtration accuracy. The primary selection can be carried out with reference to the technical parameters such as the maximum interception particle size provided by the filter cloth supplier. Although the filter cloth plays a very important role in the initial filtration accuracy of the filter press, the initial filtration accuracy is not as high as possible, and the filtration accuracy can meet the minimum requirements.

Because the filter press forms a filter layer after filtering for a period of time, the interception effect of the filter cloth is very small, and the real "filter layer" that plays the role of fine filtration, and the formation of a good filter layer is the key to the use of the filter press technology.

3) Peeling performance of the filter cake. When selecting a filter cloth, special attention should be paid to the peeling properties of the filter cake. The surface of the filter cloth is smooth and flat, the filter cake is quickly peeled, and the thorough filtration operation time is short, and the efficiency is high.

The filter cake adheres to the filter cloth and is not easy to peel off, which will prolong the operation time of the filter press and reduce the work efficiency. If the filter cloth needs to be replaced, it will take longer. Now the commonly used chamber filter press, the filter cloth replacement is more troublesome.

The selection of monofilament filter cloth is better than that of long multifilament and short fiber filter cloth, and the unpacking performance of satin fabric is better than that of plain weave filter cloth.

4) The regeneration performance of the filter cloth. When choosing a filter cloth, you should also pay attention to choosing a filter cloth with good regeneration performance. The filter cloth with good regeneration performance can be washed directly on the filter press to reduce the number of cloth changes.

After simple treatment (drying, washing, etc.), the filtration efficiency was restored to more than 80%.

5) Traveling filtration experiment of materials. The use of filter press technology is an experimental technology. It is very important to carry out filtration experiments on the raw material (without changing the properties of the material and the process conditions) after the initial selection of the filter cloth.

Sample experiments were carried out on material filtration. The filtration rate, retention effect, moisture content of the filter cake, cake discharge performance, and regeneration performance of the filter cloth were investigated.

Summary. The reason why the plate and frame filter press does not use two layers of filter cloth is that the filtration effect of one layer of filter cloth is better, and the structure of the filter cloth is relatively compact, and it is more convenient to clean. In addition, the use of two layers of filter cloth will increase the volume of the filter, increase the weight of the filter, increase the complexity of the operation, and increase the difficulty of cleaning and maintenance.

Why the plate and frame filter press does not use two layers of filter cloth.

The reason why the plate and frame filter press does not use two layers of filter cloth is that the filtration effect of one layer of filter cloth is better, and the structure of the filter cloth is relatively compact, and it is more convenient to clean. In addition, the use of two layers of filter cloth will increase the volume of the filter, increase the weight of the filter, increase the complexity of the operation, and increase the difficulty of cleaning and maintenance.

The filter cake from the continuous filter press is concentrated by the filtrate to form a soft filter cake and a thick filter cake through pump pressure, vacuum suction and mechanical extrusion, and the suspension is slowly squeezed during operation, and finally a thin filter cake with low moisture content is formed, the thickness of the filter cake can be adjusted between 3mm --- 16mm, and the moisture content can be adjusted and controlled according to the needs of the production volume, with a minimum moisture content of 11%. The more viscous and finer it is, the more it can be pressed.

Due to the structural defects of the plate and frame filter press, only one pump pressure acts, <>

Questions can be asked directly.

Are you making a statement?

The reason why the plate and frame filter press cannot use two layers of filter cloth is still within the scope of discussion. The key is caused by structural defects.

There is some truth to it. Therefore, any product needs to be constantly innovated and upgraded.

The chamber filter press is composed of two adjacent concave filter plates arranged to form a filter chamber (the two sides of the filter plate are recessed, and every two filter plates are combined to form a compartment-shaped filter chamber). The surface of the filter plate has grooves, and its protruding part is used to support the filter cloth, which is fixed to each filter plate.

The plate and frame filter press is composed of a flat filter plate and a hollow filter frame arranged alternately to form a filter chamber. The surface of the filter plate has grooves, and its protruding part is used to support the filter cloth, and the filter cloth is fixed on the hollow filter frame (plate frame).

The box plate frame is connected to the board, or the board with rubber is connected to the ordinary version; Plate-and-frame filter presses are connected to each plate and each frame. There is no difference in appearance. The volumetric chamber type of the filter chamber is generally larger than that of the plate and frame type; When disassembling and washing the filter cloth, the chamber type is more time-consuming than the plate and frame type.