How to choose industrial filter paper (filter cloth)

At present, there are many filter papers (filter cloths) on the market. Filter papers (filter cloths) used for industrial liquid filtration are mainly made of PET and PP. However, if different materials or different processing conditions are used, even if the unit weight of the filter paper (filter cloth) is the same, the filtering accuracy exhibited will vary greatly.

Industrial filter paper is also called grinder filter paper, non-woven filter paper, etc. It is used on the grinding equipment of grinding machine. Industrial filter paper can be customized according to the size of the filter or filter tank. The width of the general grinder is used. About 400mm-2000mm, weight in the range of 30-80 grams. Because of the variety of filter paper types, how can a user choose a filter cloth? Consider from the following aspects:

1. First of all, it is necessary to confirm that the working conditions include the solid-liquid composition of the filter object, the difference in filtration pressure, the temperature of the filtrate, the amount of filtration per unit time, the principle of use of the filter device, and the mechanical strength requirements of the filter cloth.

Secondly, it is necessary to determine what kind of filter materials are used on the current filtration equipment, such as whether there is a uniform rolling point, how much the thickness is, how much the unit weight is, and if there is any problem in the process of use (whether it is more foamy or easier to tear, Whether there is insufficient traffic or insufficient filtering accuracy. If it cannot be described, samples can be provided for analysis by technicians, and technicians can also conduct on-site investigations.

3. Then, the determination of filtration accuracy: The filtration accuracy is a relatively accurate concept, but the pore size distribution of the filter paper is a relatively random distribution. In order to determine the accuracy, it is usually measured by the relevant aperture testing provided by the filter cloth supplier. Then according to their own use conditions to determine.

It is easy to confuse the filtering accuracy with the unit weight of the filter cloth itself. In the same process conditions and the same material, the unit weight is positively related to the filtration accuracy. However, it is not an absolute single-related relationship. That is, if the process conditions change, even if the same unit area, the performance results are different filtering accuracy. Therefore, it often happens that one 90g product is replaced with another 100g product, and the result is that the filtering accuracy cannot reach the original 90g effect.

4. Another indicator is flux. Usually the filter cloth supplier does not directly provide the flux measured according to the specific customer's filtered liquid, and usually refers to permeability. However, breathability is a very variable parameter. Even under strict experimental conditions, the same sample will be tested several times in the same test equipment, and the two will have very different data. More likely, for some special liquids, because of their incompatibility with the material itself, there is often a case of breathable liquids. Of course, breathability is somewhat related to the flux. Similar to the unit weight and accuracy, the permeability can be predicted through permeability under certain conditions. Therefore, the user can accumulate usage experience according to his own use to obtain this related relationship. In short, breathability is a reference parameter.

5, the choice of strength: the mechanical strength of the filter cloth to try for the better, the intensity, resulting in deterioration of the parameters such as cost and uniformity, may not be very suitable. Therefore, users can measure their own strength requirements. Generally, the tensile mechanical strength index of the filter cloth is N/5CM, so the total tensile strength in a certain direction in the use width can be calculated linearly. It is suitable that the total value of this tensile strength exceeds 15-20% of the maximum mechanical force in the direction in use.