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What is the basic knowledge of polypropylene filter bags?

2022-01-05 Page view : 121 views

Polypropylene filter bag is a bag-shaped filter element made of polypropylene, which is mainly used in petrochemical, paint, biomedicine, automobile manufacturing, food and beverage, industrial dust removal and other fields.


Filter bag, a kind of filter element, makes the liquid in the suspension or the gas in the gas stream containing solid particles permeable under the applied force, and the solid particles are intercepted, so as to achieve the solid particles from the liquid or gas. Separation is mainly used to purify and purify fluids (liquid or gas). Filter bag is one form of many filter elements. In addition, there are filters, filter elements and so on. In terms of material, in addition to polypropylene, there are different materials such as polyester, nylon, and PTFE.


Structural Features

The filter material forms a three-dimensional, highly fluffy, three-dimensional depth, tortuous filter layer, which is characterized by loose fiber structure and a high rate of increase in the holding capacity of impurities. This fiber material is a compound interception mode, which effectively removes solids and soft Reactive particles, that is, larger particles and impurities are trapped on the surface of the fiber, while fine particles are trapped in the deep layer of the filter material to ensure that it will not be damaged due to pressure increase during use, so it has a high filtration efficiency. In addition, the high temperature surface Heat treatment, that is, the application of instant sintering technology/calendering treatment, can effectively prevent the fiber from being lost due to the high-speed impact of the liquid during filtration, which not only ensures that there is no filtrate pollution caused by fiber detachment, but also avoids the excessive clogging of the filter holes caused by traditional roller pressing treatment And shorten the life of the filter bag, while the pressure difference is small without affecting the flow rate.


Classification of Filter Bags

Filter bags are classified according to different methods, mainly as follows:

Edge Material of Filter Bag: stainless steel ring, galvanized steel ring and polypropylene plastic ring

Filter Bag Stitching Method: seam and ultrasonic heat sealing

Filter Bag Fiber Material: polypropylene, polyester, nylon, polytetrafluoroethylene

Filter Material Filtration Accuracy: micron


Filter Accuracy Conversion

1.) The Unit Definition of “目”:

“Mesh” refers to the number of particles of the same size arranged in a straight line per inch length, also called mesh number. Therefore, 5 mesh means that the particle diameter is 5.08mm, which can also be interpreted as the filter screen can filter particles with a size of >5.08mm; 10 mesh means the particle diameter is 2.54mm, which can also be interpreted as the filter screen can filter particles with a size of >2.54mm; so It is said that the larger the mesh, the higher the filtration accuracy. “Mesh” means the number of meshes contained in 1 square inch. 1 inch = 25.4 millimeters, 1 square inch ≈ 5 square millimeters, 1 millimeter = 1000 microns; you can calculate it yourself according to this relationship.