Production process of high-temperature-resistant high-retention filter cloth

Abstract

The application provides a production process method of high-temperature-resistant high-retention filter cloth, and belongs to the technical field of filter cloth. In the process method, glass fibers are cleaned and opened, enter a carding machine, are separated by a cylinder, form fluffy fibers, enter a net laying machine, and are uniformly laid into a fiber net. Then, the fiber net is reinforced by reciprocating movement of a needle on a needle punching machine to make the fluffy fiber net into a non-woven fabric with certain strength. After being treated by dipping PTFE emulsion and drying, the non-woven fabric is treated by a surface finishing machine, and finally, the high-temperature-resistant high-retention filter cloth is obtained. The surface of the filter cloth is treated by PTFE particles to reduce abrasion, make the surface smooth, and reduce the aggregation of dust, thereby reducing the amount of dust removal. The reduction of the amount of dust removal reduces the maintenance amount of the filter bag, prolongs the service life, the surface is water-tight, water can be prevented from passing through, dust is not easy to adhere, and the filter cloth has good high-temperature resistance.

Description

Technical Field

[0001] This invention belongs to the field of filter cloth technology, specifically relating to a production process for a high-temperature resistant and high-retention filter cloth. Background Technology

[0002] With social progress and development, coal-fired power generation, steel smelting, and waste incineration have become major sources of air quality problems. In recent years, people have paid increasing attention to environmental protection. To reduce pollutant emissions, bag filters, as an effective purification device, have gained widespread popularity and attention; they can effectively capture fine particulate matter and improve dust removal efficiency, while also possessing good filtration efficiency and wide applicability in temperate zones. The material quality in a bag filter system determines the system's resistance and filtration performance, thus affecting the overall service life and durability of the filtration system. CN201410429830.6 discloses a filter cloth applied to nano-barium sulfate and its weaving method, but it is not heat-resistant. Therefore, those skilled in the art urgently need to develop a production process for a high-temperature resistant, high-retention filter cloth to overcome the shortcomings of existing technologies and meet current market demands and performance requirements. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the main objective of the present invention is to provide a production process for high-temperature resistant and high-retention filter cloth.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A production process for a high-temperature resistant and high-retention filter cloth includes the following steps: First, after the glass fiber is unpacked, cleaned, and loosened, it is combed by a carding machine, cross-laid by a web-laying machine, and fed to a pre-needling machine, then fed into the main needle-punching machine, then impregnated with PTFE emulsion, then rolled dry, then baked, and finally finished by a finishing machine to obtain the high-temperature resistant and high-retention filter cloth.

[0006] Furthermore, the carding feed speed is 0.98 m / min to 1 m / min, the working roller speed is 85 m / min to 88 m / min, the upper doffer speed is 35 m / min to 40 m / min, the lower doffer speed is 35 m / min to 40 m / min, the upper cohesive speed is 20 m / min to 21 m / min, the lower cohesive speed is 18 m / min to 20 m / min, the cylinder speed is 85 m / min to 90 m / min, the upper cotton box air pressure is 1.4 bar, the lower cotton box air pressure is 0.3 bar, and the output speed is 24 m / min to 25 m / min.

[0007] Pressure drop, also known as resistance or pressure loss, refers to the pressure difference generated across the filter media when airflow passes through it. PM2.5 capture efficiency is related to PM2.5. 2.5PM2.5 collected by filter media 2.5 Dust quality and inlet PM 2.5 The ratio of dust mass; the resistance coefficient of clean filter media: the resistance of clean filter media at a filtration velocity of 1 m / min.

[0008] Furthermore, the net laying machine has 12 to 25 layers, an input speed of 20 to 25 m / min, and an output speed of 1 to 1.2 m / min.

[0009] Furthermore, the pre-punching input roller has a speed of 1.02m / min to 1.2m / min, the output roller has a speed of 1.4m / min to 1.6m / min, the punching frequency is 500r / min to 600r / min, and the punching depth is 7mm to 10mm.

[0010] Furthermore, in the fifth step, the main needle piercing frequency is 800-850 times / min and the piercing depth is 10-20mm; the main needle piercing frequency is 800-850 times / min and the piercing depth is 10mm-20mm; the input roller speed is 1.4r / min-1.6r / min and the output roller speed is 1.8r / min-2r / min; the input draft rate is 1%-2% and the output draft rate is 2%-3%.

[0011] Furthermore, the PTFE emulsion concentration is 8%–12%, and the impregnation time is 5–10 minutes.

[0012] Furthermore, the baking temperature is 180℃~190℃ and the baking time is 8min~10min.

[0013] The beneficial effects of this invention are:

[0014] This invention discloses a production process for high-temperature resistant and high-retention filter cloth. The process involves glass fiber being cleaned, opened, and then carded in a carding machine to form a loose fiber web, which is then evenly spread into a fiber web by a web-laying machine. Next, it is reinforced by a needle-punching machine with reciprocating needles, resulting in a nonwoven fabric with a certain strength. After PTFE emulsion impregnation, the fabric is rolled dry, baked, and then finished with a finishing machine to obtain the high-temperature resistant and high-retention filter cloth. The filter cloth surface is treated with PTFE particles to reduce wear, making it smooth and reducing dust accumulation, thus reducing the amount of dust removal. Reduced dust removal decreases filter bag maintenance, extends service life, and the impermeable surface prevents water penetration, making it difficult for dust to adhere, and also provides excellent high-temperature resistance. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to embodiments, but the implementation of the present invention is not limited thereto. Example 1

[0016] Raw materials and equipment: Miflon 21C PTFE emulsion; WL-G-20 glass fiber nonwoven combined production line, opening machine WF922A-140; web laying machine YBG102; 5cm alkali-free glass fiber from Wuhe Huachao.

[0017] The production process of high-temperature resistant and high-retention filter cloth includes the following steps: Step 1: After the glass fiber is unpacked, cleaned, and loosened, it is carded by a carding machine. The carding feed speed is 0.98 m / min, the working roller speed is 85 m / min, the upper doffer speed is 35 m / min, the lower doffer speed is 35 m / min, the upper cohesive speed is 20 m / min, the lower cohesive speed is 18 m / min, the cylinder speed is 85 m / min, the upper cotton box pressure is 1.4 bar, the lower cotton box pressure is 0.3 bar, and the output speed is 24 m / min. The web-laying machine cross-lays the web and feeds it to the pre-needling machine. The web-laying machine lays 12 layers, with an input speed of 20 m / min and an output speed of 1 m / min. Then, the main needles are fed in. The pre-needling machine has an input roller speed of 1.02 m / min, an output roller speed of 1.4 m / min, a needle punching frequency of 500 r / min, and a needle punching depth of 7 mm. The main needle punching machine has an upper needle punching frequency of 800 times / min and a needle punching depth of 10 mm. The main needle punching machine has a lower needle punching frequency of 800 times / min and a needle punching depth of 10 mm. The input roller speed is 1.4 r / min, the output roller speed is 1.8 r / min, the input stretch rate is 1%, and the output stretch rate is 2%. After being impregnated with PTFE emulsion and then rolled dry, the PTFE emulsion concentration is 8% and the impregnation time is 5 min. After baking treatment, the surface is finished by a finishing machine at a baking temperature of 180℃ and a baking time of 8 min, thus obtaining a high-temperature resistant and high-retention filter cloth.

[0018] Product performance: Warp tensile strength 2500N; weft tensile strength 2300N; warp tensile elongation at break 15%; weft tensile elongation at break 15%; air permeability 5cm / s; dynamic capture efficiency 99.996%; PM2.5 capture efficiency 99.995%; mass loss rate after abrasion ≤10%; water repellency grade 4 as specified in GB / T4745; oleophobic grade 3 as specified in GB / T19977 for oleophobic filter media; folding resistance of filter media containing glass fiber should be 15000 cycles; resistance coefficient of clean filter media 30Pa; residual resistance 300Pa; 24h heat shrinkage rate under continuous testing temperature 1.5% warp and 1% weft; 24h tensile strength retention rate under continuous testing temperature 104% warp and 102% weft; heat shrinkage rate under instantaneous testing temperature 1.5% warp and 1% weft; tensile strength retention rate under instantaneous testing temperature 96% warp and 95% weft. Example 2

[0019] Raw materials and equipment: Miflon 21C PTFE emulsion; WL-G-20 glass fiber nonwoven combined production line, opening machine WF922A-140; web laying machine YBG102; 5cm alkali-free glass fiber from Wuhe Huachao.

[0020] A production process for a high-temperature resistant, high-retention filter cloth includes the following steps: Step 1: After the glass fiber is unpacked, cleaned, and loosened, it is carded by a carding machine. The carding feed speed is 1 m / min, the working roller speed is 88 m / min, the upper doffer speed is 40 m / min, the lower doffer speed is 40 m / min, the upper cohesive speed is 21 m / min, the lower cohesive speed is 20 m / min, the cylinder speed is 90 m / min, the upper cotton box pressure is 1.4 bar, the lower cotton box pressure is 0.3 bar, and the output speed is 25 m / min. A web-laying machine cross-lays the web and feeds it to a pre-needling machine. The web-laying machine lays 25 layers, with an input speed of 25 m / min and an output speed of 1.2 m / min. Then, the main needles are fed in. The pre-needling machine has an input roller speed of 1.2 m / min, an output roller speed of 1.6 m / min, a needle punching frequency of 600 r / min, and a needle punching depth of 10 mm. The main needle punching machine has an upper needle punching frequency of 850 times / min and a needle punching depth of 20 mm. The main needle punching machine has a lower needle punching frequency of 850 times / min and a needle punching depth of 20 mm. The input roller speed is 1.6 r / min, the output roller speed is 2 r / min, the input stretch rate is 2%, and the output stretch rate is 3%. After being impregnated with PTFE emulsion with a concentration of 12% and an impregnation time of 10 min, the material is dried. After baking, the material is finished with a finishing machine at a baking temperature of 190℃ for a baking time of min, thus obtaining a high-temperature resistant and high-retention filter cloth.

[0021] Product performance: Warp tensile strength 2500N; weft tensile strength 2300N; warp tensile elongation at break 15%; weft tensile elongation at break 15%; air permeability 4.6cm / s; dynamic capture efficiency 99.997%; PM2.5 capture efficiency 99.996%; abrasion-resistant mass loss rate ≤10%; water repellency rating ≥4 as specified in GB / T4745; oleophobic filter media oleophobicity rating ≥3 as specified in GB / T19977; glass fiber-containing filter media folding resistance 15000 times; clean filter media resistance coefficient 30Pa; residual resistance 300Pa; 24h heat shrinkage rate under continuous testing temperature 1.4% warp, 0.9% weft; 24h tensile strength retention rate under continuous testing temperature 105% warp, 102% weft; heat shrinkage rate under instantaneous testing temperature 1.3% warp, 1% weft; tensile strength retention rate under instantaneous testing temperature 97% warp, ≥96% weft.

[0022] Note: Unit area mass is tested according to GB / T24218.1-2009. Air permeability is tested according to GB / T5453-1997, with a pressure drop of 200 Pa. Tensile strength and elongation at break are tested according to GB / T3923.1-2013, and for glass fiber woven filter media, tensile strength and elongation at break are tested according to GB / T7689.5-2013; abrasion resistance is tested according to GB / T21196.1-4-2007. Under a pressure of 100 cN, the filter media is ground for 10,000 revolutions using a 100# corundum wheel or silicon carbide wheel with an outer diameter of 50 mm and a width of 13 mm, and the mass loss rate of the abraded area is tested. The oleophobicity grade is tested according to GB / T19977-2014; the hydrophobicity is tested according to GB / T4745-2012; and the folding endurance is tested according to GB / T457-2008. The filter media is tested under a tension of 14.72 N, with 175 complete oscillations per minute until it forms a 135° angle with the vertical; this meets the technical requirements for baghouse dust collectors as per GB / T6719-2009.

Claims

1. A production process for a high-temperature resistant, high-retention filter cloth, characterized in that, Includes the following steps: Step 1: After the glass fiber is unpacked, cleaned, and loosened, it is combed by a carding machine and cross-laid by a web laying machine. The web laying machine lays 12 to 25 layers, with an input speed of 20 to 25 m / min and an output speed of 1 to 1.2 m / min. The glass fiber base fabric is then sent to a pre-needle punching machine. The pre-punching machine has an input roller speed of 1.02 m / min to 1.2 m / min, an output roller speed of 1.4 m / min to 1.6 m / min, a punching frequency of 500 r / min to 600 r / min, and a punching depth of 7 mm to 10 mm. Then, the main needle punching machine is fed in, with a main needle upward punching frequency of 800 to 850 times / min and a punching depth of 10 to 20 mm, and a main needle downward punching frequency of 800 to 850 times / min and a punching depth of 10 mm to 20 mm. The input roller speed is 1.4 r / min to 1.6 r / min, the output roller speed is 1.8 r / min to 2 r / min, the input stretch rate is 1% to 2%, and the output stretch rate is 2% to 3%. After being impregnated with PTFE emulsion and then rolled dry, it is baked and then finished with a finishing machine to obtain a high-temperature resistant, high-retention filter cloth.

2. The production process of a high-temperature resistant, high-retention filter cloth according to claim 1, characterized in that, The carding feed speed is 0.98 m / min to 1 m / min, the working roller speed is 85 m / min to 88 m / min, the upper doffer speed is 35 m / min to 40 m / min, the lower doffer speed is 35 m / min to 40 m / min, the upper cohesive speed is 20 m / min to 21 m / min, the lower cohesive speed is 18 m / min to 20 m / min, the cylinder speed is 85 m / min to 90 m / min, the upper cotton box air pressure is 1.4 bar, the lower cotton box air pressure is 0.3 bar, and the output speed is 24 m / min to 25 m / min.

3. The production process of a high-temperature resistant, high-retention filter cloth according to claim 1, characterized in that, The PTFE emulsion concentration is 8%–12%, and the impregnation time is 5–10 minutes.

4. The production process of a high-temperature resistant, high-retention filter cloth according to claim 1, characterized in that, The baking temperature is 180℃~190℃ and the baking time is 8min~10min.