What are the materials and advantages of liquid filter bags for filtration?

As a filter element, the filter bag is a key part of the filtration process, and the quality of the filter bag determines the filtration effect to a large extent.

Filter bag materials are: nylon, polypropylene, polyester, stainless steel, PTFE, etc. The size is divided according to the filter: No. 2 bag, No. 1 bag, No. 5 bag, No. 4 bag, No. 3 bag (from large to small).

Liquid filter bags.

Liquid filter bag rings can be stainless steel rings, PP rings and PE plastic rings, including a variety of different bag bottom and bag top designs. The filtrate surface of the liquid filter bag is treated with special singeing, which not only effectively prevents the fiber from detaching and polluting the filtrate, but also avoids the excessive blockage of the filter hole caused by the traditional roller pressing treatment and shortens the life of the filter bag. All raw materials are pure white, without any special bleaching treatment, fully in line with environmental protection standards, but also because of the three-dimensional filter layer of needle felt, so that when the liquid flows through the filter bag, the particles will be trapped on the inner wall surface and deep layer of the liquid filter bag due to the depth filtration mechanism, which has a high trapping efficiency for solid or colloidal particles.

The uniform thickness of the needle felt, the stable opening rate and the sufficient strength make the filter bag efficient stable and the service time longer. The tightest sewing of the five threads and double needles ensures that each liquid filter bag can achieve the best filtration guarantee. It has a wide range of applications and is suitable for liquid filtration in various industries.

As one of the elements of the filter, the filter bag is undoubtedly the most critical part of the filtration process, and the filter bag is called the heart of the filter, so the reason is because the filter bag largely determines the user's filtration effect. The filter bag is made of various materials and specifications. It can meet the needs of various fields.

As a filter element in the bag filtration system, the liquid filter bag is a key part of the filtration process, and the quality of the filter bag determines the user's filtration effect to a large extent.

The characteristics of liquid filter bags are strong dirt-holding capacity, large flow rate and high pressure resistance; Easy to operate, ** preferential; High rejection rate, low cost, wide range of application, acid and alkali resistance, high temperature resistance, up to 280 non-woven fibers, depth filtration, accuracy range.

It is very good to use a three-ratio polypropylene filter bag.

Polypropylene PP needle felt Polyester PE needle felt, nylon monofilament NMO, stainless steel mesh, PP mesh, PTFE, blow molding fiber, Suzhou national filter environmental protection material is of good quality, professional is worthy of your trust, welcome to contact 18550252511 Wang Jian.

Good afternoon, look at what the filtered liquid is, the common ones are PA (nylon) and PP (polypropylene), these two materials can play a good physical blocking role in filtering most of the aqueous phase and organic solvents, and it is relatively possible to filter alkaline organic solvents, PP is better solvent resistant than PA, I personally recommend using PP filter bags, please refer to it as appropriate. For high-precision filtration, it is recommended to choose a pore size of less than 1um, similar to the sum of PP microporous filter membranes.

Filter bags have excellent chemical stability and heat resistance, and are also the highest-end varieties of commonly used filter materials. Commonly used materials are divided into: polypropylene PP, polyester PET, nylon PA, viscose fiber, acrylic fiber, polyethylene HDPE, chlorine PVC, polyethylene PE, PTFE, etc.

Advantages of industrial liquid filter bags: 1. Even after the improvement of the suture of the bag mouth, there is still no high protrusion, which leads to the occurrence of side leakage. 2. The filter bag is produced by a high-speed industrial sewing machine without silicone oil cooling, and this production mode will not cause silicone oil pollution.

3. The filtration accuracy of the filter bag ranges from 300 microns. Its materials are divided into polyester and polypropylene, nylon, etc. 4. The labels marked with product specifications and models on the filter bag are all selected in a way that is easy to replace, in order to prevent the pollution of the filtrate caused by the label and ink of the filter bag in use.

5. Stainless steel welding technology. The diameter error of the filter bag is less than millimeter, and the horizontal error is less than millimeter. Installing it in equipment can improve the degree of sealing and reduce the probability of side leakage.

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

1. Selection of filter bag material:

First of all, according to the chemical name of the fluid to be filtered, according to the chemical contraindications to find out the available filter media, and then according to the filter media temperature, operating pressure, pH value, viscosity (cps), impurity type (hard particles, soft particles), impurity content (ppm), operating conditions (e.g., whether it is necessary to withstand steam, hot water or chemical sterilization, etc.), and eliminate the inapplicable filter media. Use is also an important consideration, for example, the filter media used in pharmaceuticals, food or cosmetics must be FDA-approved materials; For ultrapure water, it is necessary to select a filter material that is pure and does not contain exudates that will affect the specific impedance; For filtered gases, it is necessary to choose a hydrophobic material and whether it is required"Hygienic filtration"design and so on.

2. Accuracy selection of filter bag:

This is one of the most troubling questions. For example, to remove particles that are visible to the naked eye, use a 20- or 25-micron filter bag;To remove clouds from the liquid, use a 1 or 5 micron filter bagTo remove the smallest bacteria, micron filter bags are required. The problem is that there are two units of filtration precision:

Absolute Accuracy Nominal accuracy.

1. First of all, according to the chemical name of the fluid to be filtered, find out the available filter media according to the chemical contraindications, commonly used PE, PP, PTFE, NMO, and then evaluate and reject the inapplicable filter media one by one according to its operating temperature, operating pressure, pH value, and operating conditions (such as whether it is necessary to withstand steam, hot water or chemical sterilization, etc.). Use is also an important consideration, for example, the filter media used in pharmaceuticals, food or cosmetics must be FDA-approved materials; For ultrapure water, it is necessary to select a filter material that is pure and does not contain exudates that will affect the specific impedance; For filtered gases, it is necessary to choose a hydrophobic material and whether it is required"Hygienic filtration"design and so on. The main foreign filter bag manufacturers are GAF, FSI, 3M, CUNO, Filter, Loeffler, Park, Vablue filter bags, etc.

2. Filtration accuracy.

To remove visible particles, use a 25 micron filter

To remove clouds from liquids, use a 1 or 5 micron filter

To get rid of the smallest bacteria, a micron filter is required.

--Absolute accuracy refers to the ability to filter out 100% of the particles with the indicated accuracy. It is almost impossible not to be a realistic criterion, because 100% is an infinite value. Strictly speaking, the so-called absolute filters on the market, such as membranes, can only be called"Approaching the absolute"filters.

--There is no standard for nominal accuracy that is recognized and followed by all industry players"。In other words, Company A can set the nominal accuracy at 85-95%, while Company B would rather set it at 50-70%. In other words, Company A's 25 micron filtration accuracy may be equal to Company B's 5 microns, or finer.

For this problem, experienced professional filters** will help in the selection of filtration accuracy, and the fundamental solution is:"Try it out"。

3. According to the viscosity at the filtration temperature, the professional filtration equipment can calculate how much filter is needed, how many filter bags are loaded, how much flow rate each filter bag bears, and how much initial pressure drop is required. If the amount of impurities in the fluid can be provided, it is even possible to estimate its filtration life.

4.Design of the filtration system.

This title covers a wide range of topics, such as which kind of pressure should be used, how much pressure is needed to fully use the life of the filter element, whether two sets of filters need to be installed in parallel to be suitable for continuous operation of the system, how to match coarse filtration and fine filtration for occasions with wide particle size distribution, whether check valves or other devices need to be installed in the system, etc. These require close cooperation between the user and the filter vendor to find the most appropriate design.

Select the filter bag, first determine the temperature, pH, viscosity, solid content and operating pressure of the liquid, according to these parameters to select the material, accuracy, workmanship and other details of the filter bag, it is recommended to choose the domestic first-line brand Suzhou National Filtration to make a professional custom choice for you, contact Wang Jian, 18550252511 **.