Filter cloth can be divided into polyester filter cloth, polypropylene filter cloth, nylon filter cloth, viscose filter cloth, cotton filter cloth, new high-efficiency material filter cloth, etc. according to the material properties.
1、 Classification
1. Filter cloth can be divided into polyester filter cloth, polypropylene filter cloth, nylon filter cloth, viscose filter cloth, cotton filter cloth, new high-efficiency material filter cloth, etc. according to the material properties.
2. According to the textile method, it can be divided into two types.
(1) Weaving fabric. Including polyester, polypropylene, nylon, vinylon, cotton, etc. There are several weaving methods for filter cloth patterns, including plain weave, twill weave, satin weave, double-layer weave, etc.
(2) Non woven fabric. Including non-woven fabric, geotextile, filter felt, etc. The methods include spunbond, needle punching, water weaving, etc.
3. The silk material of filter cloth is also divided into three types: single fiber, long fiber composite fiber, and short fiber. (Among them, the polyester short fiber series is also divided into large synthetic fiber and small synthetic fiber)
2、 Performance
Performance Polyester Nylon Polypropylene Vinylon
Strong acid resistance, poor acid resistance, good acid resistance, or not
Alkali resistance, good resistance to weak alkali, strong resistance to strong alkali
The conductivity is poor, good, and average
Fracture elongation 30% -40% 18% -45% greater than polyester 12% -25%
Very good responsiveness, better than poor polyester
Very good wear resistance, very good, very good
Heat resistance 170 ℃ 130 ℃ shrinkage 90 ℃ shrinkage 100 ℃ shrinkage
Softening point 230 ℃ -240 ℃ 180 ℃ 140 ℃ -150 ℃ 200 ℃
Melting point 255 ℃ -265 ℃ 210 ℃ -215 ℃ 165 ℃ -170 ℃ 220 ℃
3、 Application:
>
Chemical industry: food industry, metallurgical industry, non-metallic minerals: pharmaceutical industry, environmental engineering, automotive industry
4、 Product
There are hundreds or thousands of product models for filter cloth, and it is impossible to list them all. Among them, polyester and polypropylene have the widest application range. Let's list the commonly used ones and familiarize ourselves with them.
（1） Weaving fabric
1. Polyester filter cloth
Polyester long fiber filter cloth‐ — 60-8(130) 60-10(240) 60-9(260) 60-7(621） 611 625
Polyester short fiber filter cloth‐ — 120-7(5926) 120-12(734) 120-13(745) 120-14(747)
120-15(758) 120-16(3927) 858
2. Polypropylene filter cloth
Polypropylene short fiber filter cloth: 4212
Polypropylene long fiber filter cloth: 52l, 527, 534, 750 (AB), 750 (A), 750 (B)
522, 108 (B), 108 (C), 850.
3. Nylon filter cloth
407, 301, 663, 601
4. Vinylon filter cloth
295-1A、295-102、295-104、295-1
5. Cotton filter cloth
The materials include 21 count cotton yarn, 10 count cotton yarn, and 16 count cotton yarn, with specifications of 3× 4 4× 4 5× 5 5× 6 6× 6 7× 7 8× 8 9× 9 1O× 10 1O× 11 11× 11 12× 12 16× More than 19 specifications.
6. New efficient filter cloth
The new high-efficiency filter cloth is mainly used for air filtration and dust removal, with a smooth surface, good peelability, and high stability
Using various monofilaments (commonly known as synthetic yarns) as raw materials, they are divided into several categories: polyester, nylon, and polypropylene.
PE Class: 3415 3232 7033
PA Class: 2322 2304 5718
PP Class: 3127 5722 3509 6022 12870
（2） Non-woven fabric
7. Non woven fabric
There are several types of non-woven fabrics, including primary effect, medium effect, and high-efficiency, with polyester and polypropylene being the main materials. It is made of polyester and polypropylene raw materials, which are needle punched, combed, and woven with a woven fabric layer at the center of the fabric. After double core treatment, the air flow forms a net and needle punched composite fabric. The filter cloth has a three-dimensional structure, and after heat setting and singeing, it is treated with chemical oil on the surface to make the filter cloth smooth and evenly distributed with micropores. From the surface, the product has good density, smooth surface on both sides, and good breathability.
8. Filter felt.
The surface has been treated by hot stamping, singeing, or coating, resulting in a smooth and flat surface According to the material, there are mainly polyester filter felt, polypropylene filter felt, glass fiber filter felt, Metas high-temperature resistant filter felt, Flumes high-temperature resistant filter felt, PS filter felt, and P84 high-temperature resistant filter felt. According to their functions, there are mainly anti high temperature filter felt, anti-static filter felt, easy to clean dust filter felt, anti oil and anti filter felt, fireproof flower filter felt, film covered filter felt, etc.
9. Geotextile
Widely used in construction, engineering, bridges, and roads
5、 Next, let's talk about the key methods for identifying filter cloth. In fact, many websites have some introductions, but they tend to focus on theory. Microscopic observation methods and fiber density measurement methods are unrealistic. We in the filter cloth business need to determine its model within 1 minute, so let's share some practical information with everyone.
To identify filter cloth, it is necessary to first understand several main technical indicators of the filter cloth. The main factors include density, thickness, weight, breathability, and fracture strength. More practical options include density, thickness, weight, and breathability.
1. Let's take a look first. In terms of the color of the filter cloth, the large synthetic fiber filter cloth appears white and has a good luster. The small synthetic fiber filter cloth is dark and gray, and some filter felt such as Nomex has a yellowish color. (Glossiness of filter cloth) Long fiber filter cloth has a smooth and shiny surface, while short fiber filter cloth has a hairy surface. The patterns of the filter cloth, such as diagonal and plain weave, can also help you determine the model. Because some specifications have different patterns, the specifications may also vary.
2. Touch again. (Softness) Among them, short fibers such as 208729 are as soft as plush fabric. 734, 747, 758, and 3927 are all woven from the same material, with only differences in thickness and density. 3927 is very rough, sturdy, and not soft. The softness and roughness require you to touch the sample bit by bit and write it down. It's difficult to explain clearly. Density: One is to touch it with your hand, and it's best to count how many threads there are in 10cm. The corresponding filter cloth specifications have their own density coefficients, which can be roughly distinguished by comparing them.
3. Call again. The main purpose is to measure the thickness of the filter cloth, preferably by taking a small piece and weighing it (in meters per square meter).
4. Burn it again. Polyester emits black smoke when burned, while polypropylene emits a green glow when burned. It's hard to say if the others were burned accurately.
5. The above are a few technical opinions. From a conceptual perspective, our order is to first determine whether it is a woven fabric, then determine the material (polyester, polypropylene or something else), and finally make a rough judgment on the length of the fiber and the pattern. Based on the thickness, density, and weight technical indicators of the filter cloth, the filter cloth model is comprehensively determined. Of course, the prerequisite is that you have a rough specification table for the corresponding model
