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Liquid filter bag selection should pay attention to the problem?

2022-02-08 Page view : 29 views

First of all, it is necessary to understand the filtration mechanism of the bag filter system: the liquid flows from the filter bag to the outside of the bag, and the filtered particles are trapped in the bag. The working principle of the bag filter is pressure filtration. The bag filter system mainly includes three parts: filter container, support basket and filter bag.


1.) Selection of Filter Bag Material:

According to the chemical name of the fluid to be filtered, find out the available filter material according to the chemical combination taboo, and then according to its filter medium temperature, operating pressure, pH value, viscosity (CPS), impurity types such as (hard particles, soft particles), Impurity content (PPM), operating conditions (for example, whether it needs to withstand steam, hot water or chemical sterilization, etc.), evaluate one by one, and reject inappropriate filter media. Use is also an important consideration. For example, the filter material used for drugs, food or cosmetics must be FDA-approved; ultra-pure water must be pure and free from emissions that will affect the specific impedance; filter gas must be Choose hydrophobic materials and whether you need a “sanitary filter” design, etc.


2.) Selection of the Precision of the Filter Bag:

This is one of the most troubling questions. For example, to remove particles visible to the naked eye, use a 20- or 25-micron filter bag; to remove clouds in liquids, use a 1- or 5-micron filter bag; to filter out the smallest bacteria, a 0.2-micron filter bag is required. The problem is that there are two filter precision units: absolute precision/nominal precision.