Acid-resistant papermaking felt and production and processing method thereof

Abstract

The invention discloses an acid-resistant papermaking felt and a production and processing method thereof, and relates to the technical field of papermaking felt manufacturing in the papermaking industry, the formula comprises the following components: a base mesh material nylon fiber, a fiber material and an auxiliary agent, according to the acid-resistant papermaking felt, the nylon fiber PA610, the PA6 polymer fiber and the acid neutralizer in a specific proportion are added into the papermaking felt to serve as auxiliaries, the acid resistance of the felt is remarkably improved, and the acid-resistant papermaking felt can be used for a long time in an acid environment and is not prone to damage, so that the service life is prolonged, the replacement frequency is reduced, and the production cost is reduced. And higher economic benefits are brought to the papermaking industry.

Description

Technical Field

[0001] The invention relates to the technical field of papermaking felt manufacturing in the papermaking industry, in particular to an acid-resistant papermaking felt and a production and processing method thereof. Background Art

[0002] In the papermaking industry, papermaking felts, as an important part of paper machines, play the role of transferring pulp, dehydrating, pressing and protecting paper sheets. With the continuous development of papermaking technology and the improvement of paper quality, the performance requirements for papermaking felts are getting higher and higher, especially in the production process of some special paper products, such as the production of acid paper, which poses a higher challenge to the acid resistance of papermaking felts.

[0003] In traditional technology, the base mesh material of papermaking felts is mostly made of nylon fibers, and the fiber materials are mostly general polymer fibers. However, these materials have obvious deficiencies in acid resistance. Although nylon fibers have good strength and wear resistance, they are prone to hydrolysis in acidic environments, resulting in a decrease in fiber performance and affecting the service life of the papermaking felt. At the same time, general polymer fibers are also easily corroded under acidic conditions, making the acid resistance of papermaking felts unable to meet the needs of specific paper product production.

[0004] In summary, in order to overcome the shortcomings of traditional papermaking felts in terms of acid resistance, the present invention proposes an acid-resistant papermaking felt and a production and processing method thereof, which is particularly important. Summary of the invention

[0005] The purpose of the present invention is to make up for the deficiencies of the prior art and to provide an acid-resistant papermaking felt and a production and processing method thereof. The method effectively improves the acid resistance of the papermaking felt by selecting specific nylon fiber PA610 as a base mesh material and PA6 polymer fiber as a fiber material, and adding an acid neutralizer as an auxiliary agent. At the same time, by optimizing the production and processing method, the overall performance and service life of the papermaking felt are further improved, thereby meeting the demand for acid-resistant papermaking felts in the production of specific paper products.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: On the one hand, an acid-resistant papermaking felt and a production and processing method thereof are composed of the following components: a base mesh material nylon fiber, a fiber material, and an auxiliary agent;

[0007] The base mesh material nylon fiber PA610 is nylon fiber PA610 polymer;

[0008] The fiber material PA6 is PA6 polymer fiber;

[0009] The auxiliary agent is an acid neutralizer.

[0010] Furthermore, the base net material nylon fiber PA610 is a nylon fiber PA610 polymer that accounts for 50%-55% of the total raw materials, and the base net weighs 1200g.

[0011] Furthermore, the fiber material PA6 is PA6 polymer fiber, accounting for 45%-50% of the total raw materials.

[0012] Furthermore, the auxiliary agent is an acidic neutralizer as an auxiliary agent, and the acidic neutralizer is added in an amount of 2%-3% of the total raw material weight and diluted to the aqueous solution.

[0013] On the other hand, a method for producing and processing an acid-resistant papermaking felt is characterized in that the method comprises the following specific steps: S1, weaving a bottom mesh;

[0014] S1.1. Base mesh selection: 100% PA610 is used as the base mesh;

[0015] S1.2, base fabric parameters

[0016] S1.3, surface base fabric: weight 300, 1 / 3 twill weave, wire diameter type MD / CD 0.55 / 0.2*4;

[0017] S1.4, middle 1-layer base fabric: weight 300, 1 / 3 twill weave, wire diameter type MD / CD is 0.55 / 0.2*4;

[0018] S1.5, middle 2-layer base fabric: weight 300, 1 / 3 twill weave, wire diameter type MD / CD is 0.55 / 0.2*4;

[0019] S1.6, bottom base fabric: weight 300, 1 / 3 twill weave, wire diameter type MD / CD is 0.55 / 0.2*4;

[0020] S2. Acupuncture process

[0021] S2.1 Fiber selection and mixing

[0022] Select 44etx, 67etx and 100etx as the raw materials of the double-seam pulp blanket, add an acid neutralizer according to 2% of the total raw material weight and mix;

[0023] S2.2, Fiber carding and pile formation

[0024] The fibers were wetted before combing and an acid neutralizer was added again at 2% of the total raw material weight;

[0025] During the wool-combining process, when the wool-combining machine processes 44etx fibers, the initial humidity is 12%, the amount of water added is 500L, the water addition method is spraying, the solution concentration is 2%, the wetting uniformity is good, and the water addition time is 35 minutes;

[0026] S2.3, carding fibers

[0027] The fibers moistened with acid neutralizer are fed into the carding machine using a carding device. The main cylinder speed of the carding machine is set to 1000-1500 rpm, and the spacing between the working roller and the cylinder is 0.5-1 mm.

[0028] S2.4, velvet roll forming

[0029] The carded wool web is sent to the forming area, where the fibers are combined with the bottom web using forming rollers and special needle plates;

[0030] S2.5, Blanket formation

[0031] The double-seamed bottom mesh papermaking felt is composed of 1+1+1+1 four-layer bottom mesh, which is compounded by special needle-laying process and needle-punching process. The structure from top to bottom is: CT-300g, wire diameter type MD / CD is 0.55 / 0.24, C1-300g, wire diameter type MD / CD is 0.55 / 0.24, C2-300g, wire diameter type MD / CD is 0.55 / 0.24, CB-300g, wire diameter type MD / CD is 0.55 / 0.24, BT-44etx-220g, B1-67etx-420g, B2-100etx-280g, BB-67etx-280g;

[0032] S3, finalization and preprocessing

[0033] S3.1. Cleaning: Use cleaning equipment to thoroughly clean the double-seamed blanket at a water pressure of 0.5MPa-1MPa to remove surface impurities;

[0034] S3.2, Chemical treatment agent spraying and suction

[0035] Spray chemical treatment agent on the surface of the blanket, the spraying amount of chemical treatment agent is 100g / m2 2 At the same time, through vacuum suction on the reverse side, the vacuum degree is maintained at 50kPa-80kPa, so that the chemical treatment agent can fully enter the interior of the blanket;

[0036] S3.3, Heat setting and pre-pressing

[0037] Heat the hot oil roller to 220 degrees to heat-set the blanket for 10-15 minutes. During the setting process, pre-pressing is performed with a pressure of 20N / cm. 2 -30N / cm 2 ;

[0038] S4. Detection

[0039] S4.1. Physical performance test

[0040] The strength, thickness and air permeability of the blanket were tested using testing equipment. The air permeability after velvet was 220cfm and the air permeability before storage was 150cfm.

[0041] S4.2. Appearance inspection

[0042] Carefully inspect the felt for flaws, stains, or uneven areas, either manually or with the aid of inspection equipment.

[0043] Furthermore, the S1.6 weaving control parameters are:

[0044] Tension: During the weaving process, keep the warp tension at 30N-50N and the weft tension at 20N-40N;

[0045] Weft density: Set the weft density to 50 strands / 10cm;

[0046] Temple support setting: Temple support width is 10mm;

[0047] Size: Determine the size of the bottom net according to product requirements, for example, the width is 2m and the length is 100m.

[0048] Furthermore, in the S2.4, velvet roll forming process, when the pre-needling machine processes 44etx fiber, the fiber content is 100% and the density is 44.1g / cm 3 , length 55-128mm, elongation 17.3mm, solution concentration 1%, adding method is spraying, wetting uniformity is good, adding water for 35 minutes, single layer gross weight 220g / m 2 , width 7, velvet roll length 25.

[0049] Furthermore, the acupuncture process control parameters are:

[0050] Forward speed: Set the forward speed of the needle loom to 1m / min-2m / min;

[0051] Puncture depth: Control the puncture depth of the needle to 8mm-12mm;

[0052] Tension: During the needling process, the longitudinal tension of the blanket is maintained at 40N-60N, and the transverse tension is maintained at 30N-50N;

[0053] Number of broken needles: controlled to 0.

[0054] Compared with the prior art, an acid-resistant papermaking felt and a production and processing method thereof have the following beneficial effects:

[0055] 1. The present invention significantly improves the acid resistance of the papermaking felt by adding a specific proportion of nylon fiber PA610, PA6 polymer fiber and an acid neutralizer as additives into the papermaking felt. The acid-resistant papermaking felt can be used for a long time in an acidic environment without being easily damaged, thereby extending the service life and reducing the replacement frequency, bringing higher economic benefits to the papermaking industry.

[0056] 2. The present invention has multiple production and processing steps including bottom net weaving, needling process, shaping and pretreatment, and testing. Each step is carefully designed and optimized. In the needling process, by selecting suitable fiber raw materials, controlling the wetness of the fibers, combing the uniformity of the fibers, and optimizing the parameter settings of the needling machine, the final blanket has better physical properties and appearance quality. At the same time, through strict testing steps, it is ensured that the performance of each batch of products meets the standards, thereby improving the quality and stability of the products. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0058] Figure 1 An acid-resistant papermaking felt production and processing method operation flow chart;

[0059] Figure 2 A specific content diagram of the wool content of an acid-resistant papermaking felt production and processing method;

[0060] Figure 3 A specific content diagram of pre-puncture in a production and processing method of an acid-resistant papermaking felt. DETAILED DESCRIPTION

[0061] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0062] Comparative Example

[0063] Nylon fiber PA610 polymer is selected as the base mesh material, accounting for 52% of the total raw materials (satisfying the range requirement of 50%-55%), the base mesh weight is set to 1200g, PA6 polymer fiber is used as the fiber material, accounting for 48% of the total raw materials (within the range of 45%-50%), and an acidic neutralizer is prepared as an auxiliary agent, and its addition amount is diluted to the aqueous solution at 2.5% of the total raw material weight (in the range of 2%-3%).

[0064] Clearly select 100% PA610 as the base mesh wire, set the base fabric parameters, set the weight to 300, adopt 1 / 3 twill weave, wire diameter type MD / CD is 0.55 / 0.2*4, weight 300, also adopt 1 / 3 twill weave, wire diameter type MD / CD is 0.55 / 0.2*4, weight 300, weave method is 1 / 3 twill weave, wire diameter type MD / CD is 0.55 / 0.2*4, weight 300, 1 / 3 twill weave, wire diameter type MD / CD is 0.55 / 0.2*4. In the process of weaving the bottom base fabric, keep the warp tension at 40N (within the range of 30N-50N), the weft tension is 30N (within the range of 20N-40N), set the weft density to 50 roots / 10cm, the side support width is 10mm, the width of the bottom mesh produced this time is 2m and the length is 100m.

[0065] 44etx, 67etx, and 100etx are selected as the raw materials for the double-seam pulp blanket, and an acid neutralizer is added at 2% of the total raw material weight to mix, the fiber is wetted before combing, and an acid neutralizer is added again at 2% of the total raw material weight, such as Figure 2 Taking 44etx fiber as an example, when it is processed in the No. 1 wool combining machine of Class A on 2024 / 3 / 1, the initial humidity is 12%, the water addition amount is 500L, the water addition method of spraying is adopted, the solution concentration is 2%, the wetting uniformity is good, the water addition time is 35 minutes, and the fiber moistened with the acid neutralizer is sent into the carding machine by using a carding device, and the main cylinder speed of the carding machine is set to 1200rpm (within the range of 1000rpm-1500rpm), and the spacing between the working roller and the cylinder is 0.8mm (within the range of 0.5mm-1mm). During the pre-needling process, Figure 3 Taking 44etx fiber as an example, when processed by the pre-needling machine, the fiber content is 100% and the density is 44.1g / cm 3 , length is 90mm (within the range of 55-128mm), elongation is 17.3mm, solution concentration is 1%, spray addition method is adopted, wetting uniformity is good, water addition time is 35 minutes, single layer gross weight is 220g / m 2, width 7, pile roll length 25, the carded wool net is sent to the forming area, and the fiber is combined with the bottom net by forming rollers and special needle plates to form a double-seam bottom net papermaking felt. Its structure from top to bottom is: CT-300g, wire diameter type MD / CD is 0.55 / 0.24, C1-300g, wire diameter type MD / CD is 0.55 / 0.24, C2-300g, wire diameter type MD / CD is 0.55 / 0.24, CB-300g, wire diameter type MD / CD is 0.55 / 0.24, BT-44e tx-220g, B1-67etx-420g, B2-100etx-280g, BB-67etx-280g, set the forward speed of the needling machine to 1.5m / min (within the range of 1m / min-2m / min), control the penetration depth of the needle to 10mm (within the range of 8mm-12mm), and during the needling process, keep the longitudinal tension of the blanket at 50N (within the range of 40N-60N), and the transverse tension at 40N (within the range of 30N-50N), and try to control the number of broken needles to 0.

[0066] Use cleaning equipment to fully clean the double-seam blanket at a water pressure of 0.8MPa (within the range of 0.5MPa-1MPa) to remove surface impurities, and spray chemical treatment agent on the blanket surface at a spraying rate of 100g / m2. 2 At the same time, vacuum suction is performed on the reverse side to maintain the vacuum degree at 65kPa (within the range of 50kPa-80kPa), so that the chemical treatment agent can fully enter the interior of the blanket. The hot oil roller is heated to 220 degrees to perform heat setting treatment on the blanket. The setting time is 12 minutes (within the range of 10 minutes-15 minutes). During the setting process, pre-pressing operation is performed with a pre-pressing pressure of 25N / cm 2 (at 20N / cm 2 -30N / cm 2 range).

[0067] Use testing equipment to test the strength, thickness (should be 5mm), and air permeability of the blanket. After testing, the air permeability after tufting is 220cfm, and the air permeability when put into storage is 150cfm. Carefully check the appearance of the blanket manually or with the help of testing equipment to check for defects, stains or uneven areas. No obvious problems were found after inspection, and the product meets production requirements.

[0068] Embodiment 1

[0069] According to the above comparative examples 1 and 2, only the content of the base mesh material nylon fiber PA610 is changed, and nylon fiber PA610 polymer is selected as the base mesh material, and its proportion in the total raw materials is 50% (satisfying the range requirement of 50%-55%), the base mesh weight is set to 1200g, and PA6 polymer fiber is used as the fiber material, accounting for 50% of the total raw materials (within the range of 45%-50%), and an acidic neutralizer is prepared as an auxiliary agent, and its addition amount is diluted to an aqueous solution at 2.5% of the total raw material weight (in the range of 2%-3%).

[0070] 100% PA610 is clearly selected as the base mesh, the weight is set to 300, 1 / 3 twill weave is adopted, the wire diameter type MD / CD is 0.55 / 0.2*4, the weight of the middle 1 layer base fabric is 300, and 1 / 3 twill weave is also adopted, the wire diameter type MD / CD is 0.55 / 0.2*4, the weight of the middle 2 layer base fabric is 300, the weaving method is 1 / 3 twill weave, and the wire diameter type MD / CD is 0.55 / 0.2* 4. The weight of the bottom base fabric is 300, 1 / 3 twill weave, the wire diameter type MD / CD is 0.55 / 0.2*4. During the weaving of the bottom base fabric, the warp tension is maintained at 40N (within the range of 30N-50N), the weft tension is 30N (within the range of 20N-40N), the weft density is set to 50 strands / 10cm, the side support width is 10mm, the width of the bottom mesh produced this time is 2m, and the length is 100m.

[0071] 44etx, 67etx, and 100etx are selected as the raw materials for the double-seam pulp blanket, and an acid neutralizer is added at 2% of the total raw material weight to mix, the fiber is wetted before combing, and an acid neutralizer is added again at 2% of the total raw material weight, such as Figure 2 Taking 44etx fiber as an example, when it is processed in the No. 1 wool combining machine of Class A on 2024 / 3 / 1, the initial humidity is 12%, the water addition amount is 500L, the water addition method of spraying is adopted, the solution concentration is 2%, the wetting uniformity is good, the water addition time is 35 minutes, and the fiber moistened with the acid neutralizer is sent into the carding machine by using a carding device, and the main cylinder speed of the carding machine is set to 1200rpm (within the range of 1000rpm-1500rpm), and the spacing between the working roller and the cylinder is 0.8mm (within the range of 0.5mm-1mm). During the pre-needling process, Figure 3 Taking 44etx fiber as an example, when processed by the pre-needling machine, the fiber content is 100% and the density is 44.1g / cm 3 , length is 90mm (within the range of 55-128mm), elongation is 17.3mm, solution concentration is 1%, spray addition method is adopted, wetting uniformity is good, water addition time is 35 minutes, single layer gross weight is 220g / m 2, width 7, pile roll length 25, the carded wool net is sent to the forming area, and the fiber is combined with the bottom net by forming rollers and special needle plates to form a double-seam bottom net papermaking felt. Its structure from top to bottom is: CT-300g, wire diameter type MD / CD is 0.55 / 0.24, C1-300g, wire diameter type MD / CD is 0.55 / 0.24, C2-300g, wire diameter type MD / CD is 0.55 / 0.24, CB-300g, wire diameter type MD / CD is 0.55 / 0.24, BT-44e tx-220g, B1-67etx-420g, B2-100etx-280g, BB-67etx-280g, set the forward speed of the needling machine to 1.5m / min (within the range of 1m / min-2m / min), control the penetration depth of the needle to 10mm (within the range of 8mm-12mm), and during the needling process, keep the longitudinal tension of the blanket at 50N (within the range of 40N-60N), and the transverse tension at 40N (within the range of 30N-50N), and try to control the number of broken needles to 0.

[0072] Use cleaning equipment to fully clean the double-seam blanket at a water pressure of 0.8MPa (within the range of 0.5MPa-1MPa) to remove surface impurities, and spray chemical treatment agent on the blanket surface at a spraying rate of 100g / m2. 2 At the same time, vacuum suction is performed on the reverse side to maintain the vacuum degree at 65kPa (within the range of 50kPa-80kPa), so that the chemical treatment agent can fully enter the interior of the blanket. The hot oil roller is heated to 220 degrees to perform heat setting treatment on the blanket. The setting time is 12 minutes (within the range of 10 minutes-15 minutes). During the setting process, pre-pressing operation is performed with a pre-pressing pressure of 25N / cm 2 (at 20N / cm 2 -30N / cm 2 range).

[0073] Use testing equipment to test the strength, thickness (should be 5mm), and air permeability of the blanket. After testing, the air permeability after tufting is 210cfm, and the air permeability when put into storage is 140cfm. Carefully check the appearance of the blanket manually or with the help of testing equipment to check for defects, stains or uneven areas. No obvious problems were found after inspection, and the product meets production requirements.

[0074] Embodiment 2

[0075] Nylon fiber PA610 polymer is selected as the base mesh material, accounting for 55% of the total raw materials (satisfying the range requirement of 50%-55%), the base mesh weight is set to 1200g, PA6 polymer fiber is used as the fiber material, accounting for 45% of the total raw materials (within the range of 45%-50%), and an acidic neutralizer is prepared as an auxiliary agent, and its addition amount is diluted to the aqueous solution at 2.5% of the total raw material weight (in the range of 2%-3%).

[0076] 100% PA610 is clearly selected as the base mesh, the weight is set to 300, 1 / 3 twill weave is adopted, the wire diameter type MD / CD is 0.55 / 0.2*4, the weight of the middle 1 layer base fabric is 300, and 1 / 3 twill weave is also adopted, the wire diameter type MD / CD is 0.55 / 0.2*4, the weight of the middle 2 layer base fabric is 300, the weaving method is 1 / 3 twill weave, and the wire diameter type MD / CD is 0.55 / 0.2* 4. The weight of the bottom base fabric is 300, 1 / 3 twill weave, the wire diameter type MD / CD is 0.55 / 0.2*4. During the weaving of the bottom base fabric, the warp tension is maintained at 40N (within the range of 30N-50N), the weft tension is 30N (within the range of 20N-40N), the weft density is set to 50 strands / 10cm, the side support width is 10mm, the width of the bottom mesh produced this time is 2m, and the length is 100m.

[0077] 44etx, 67etx, and 100etx are selected as the raw materials of the double-seam pulp blanket, and an acid neutralizer is added at 2% of the total raw material weight to mix, the fiber is wetted before combing, and an acid neutralizer is added again at 2% of the total raw material weight, such as Figure 2 Taking 44etx fiber as an example, when it is processed in the No. 1 wool combining machine of Class A on 2024 / 3 / 1, the initial humidity is 12%, the water addition amount is 500L, the water addition method of spraying is adopted, the solution concentration is 2%, the wetting uniformity is good, the water addition time is 35 minutes, and the fiber moistened with the acid neutralizer is sent into the carding machine by using a carding device, and the main cylinder speed of the carding machine is set to 1200rpm (within the range of 1000rpm-1500rpm), and the spacing between the working roller and the cylinder is 0.8mm (within the range of 0.5mm-1mm). During the pre-needling process, Figure 3 Taking 44etx fiber as an example, when processed by the pre-needling machine, the fiber content is 100% and the density is 44.1g / cm 3 , length is 90mm (within the range of 55-128mm), elongation is 17.3mm, solution concentration is 1%, spray addition method is adopted, wetting uniformity is good, water addition time is 35 minutes, single layer gross weight is 220g / m 2, width 7, pile roll length 25, the carded wool net is sent to the forming area, and the fiber is combined with the bottom net by forming rollers and special needle plates to form a double-seam bottom net papermaking felt. Its structure from top to bottom is: CT-300g, wire diameter type MD / CD is 0.55 / 0.24, C1-300g, wire diameter type MD / CD is 0.55 / 0.24, C2-300g, wire diameter type MD / CD is 0.55 / 0.24, CB-300g, wire diameter type MD / CD is 0.55 / 0.24, BT-44e tx-220g, B1-67etx-420g, B2-100etx-280g, BB-67etx-280g, set the forward speed of the needling machine to 1.5m / min (within the range of 1m / min-2m / min), control the penetration depth of the needle to 10mm (within the range of 8mm-12mm), and during the needling process, keep the longitudinal tension of the blanket at 50N (within the range of 40N-60N), and the transverse tension at 40N (within the range of 30N-50N), and try to control the number of broken needles to 0.

[0078] Use cleaning equipment to fully clean the double-seam blanket at a water pressure of 0.8MPa (within the range of 0.5MPa-1MPa) to remove surface impurities, and spray chemical treatment agent on the blanket surface at a spraying rate of 100g / m2. 2 At the same time, vacuum suction is performed on the reverse side to maintain the vacuum degree at 65kPa (within the range of 50kPa-80kPa), so that the chemical treatment agent can fully enter the interior of the blanket. The hot oil roller is heated to 220 degrees to perform heat setting treatment on the blanket. The setting time is 12 minutes (within the range of 10 minutes-15 minutes). During the setting process, pre-pressing operation is performed with a pre-pressing pressure of 25N / cm 2 (at 20N / cm 2 -30N / cm 2 range).

[0079] Use testing equipment to test the strength, thickness (should be 5mm), and air permeability of the blanket. After testing, the air permeability after tufting is 230cfm, and the air permeability when put into storage is 160cfm. Carefully check the appearance of the blanket manually or with the help of testing equipment to check for defects, stains or uneven areas. No obvious problems were found after inspection, and the product meets production requirements.

[0080] Effect: The above two embodiments demonstrate the production and processing of acid-resistant papermaking felts. In each embodiment, except for the different content of nylon fiber PA610 in the base mesh material, other parameters remain unchanged. The PA610 content in the comparative example is 52%, in Example 1 it is 50%, and in Example 2 it is 55%. Different PA610 contents show different physical properties. In terms of air permeability, the air permeability of the comparative example after pile plucking is 220cfm, and the air permeability when put into storage is 150cfm. The air permeability of Example 1 after pile plucking is 210cfm, and the air permeability when put into storage is 140cfm. The air permeability of Example 2 after pile plucking is 230cfm, and the air permeability when put into storage is 160cfm. It can be seen that with the change of the content of nylon fiber PA610 in the base mesh material, the air permeability physical properties of the felt also change accordingly. This provides a reference for selecting the appropriate base mesh material content according to actual papermaking needs. At the same time, the felts produced in each embodiment meet the production requirements after appearance inspection, and can ensure normal use in the papermaking process.

[0081] Embodiment 3

[0082] According to the above comparative examples 3 and 4, only the content of the fiber material PA6 was changed, and nylon fiber PA610 polymer was selected as the base mesh material, accounting for 52% of the total raw materials (satisfying the range requirement of 50%-55%), the base mesh weight was set to 1200g, and PA6 polymer fiber was used as the fiber material, accounting for 45% of the total raw materials (within the range of 45%-50%), and an acidic neutralizer was prepared as an auxiliary agent, and its addition amount was diluted to an aqueous solution at 2.5% of the total raw material weight (in the range of 2%-3%).

[0083] 100% PA610 is clearly selected as the base mesh, the weight is set to 300, 1 / 3 twill weave is adopted, the wire diameter type MD / CD is 0.55 / 0.2*4, the weight of the middle 1 layer base fabric is 300, and 1 / 3 twill weave is also adopted, the wire diameter type MD / CD is 0.55 / 0.2*4, the weight of the middle 2 layer base fabric is 300, the weaving method is 1 / 3 twill weave, and the wire diameter type MD / CD is 0.55 / 0.2* 4. The weight of the bottom base fabric is 300, 1 / 3 twill weave, the wire diameter type MD / CD is 0.55 / 0.2*4. During the weaving of the bottom base fabric, the warp tension is maintained at 40N (within the range of 30N-50N), the weft tension is 30N (within the range of 20N-40N), the weft density is set to 50 strands / 10cm, the side support width is 10mm, the width of the bottom mesh produced this time is 2m, and the length is 100m.

[0084] 44etx, 67etx, and 100etx are selected as the raw materials for the double-seam pulp blanket, and an acid neutralizer is added at 2% of the total raw material weight to mix, the fiber is wetted before combing, and an acid neutralizer is added again at 2% of the total raw material weight, such as Figure 2 Taking 44etx fiber as an example, when it is processed in the No. 1 wool combining machine of Class A on 2024 / 3 / 1, the initial humidity is 12%, the water addition amount is 500L, the water addition method of spraying is adopted, the solution concentration is 2%, the wetting uniformity is good, the water addition time is 35 minutes, and the fiber moistened with the acid neutralizer is sent into the carding machine by using a carding device, and the main cylinder speed of the carding machine is set to 1200rpm (within the range of 1000rpm-1500rpm), and the spacing between the working roller and the cylinder is 0.8mm (within the range of 0.5mm-1mm). During the pre-needling process, Figure 3 Taking 44etx fiber as an example, when processed by the pre-needling machine, the fiber content is 100% and the density is 44.1g / cm 3 , length is 90mm (within the range of 55-128mm), elongation is 17.3mm, solution concentration is 1%, spray addition method is adopted, wetting uniformity is good, water addition time is 35 minutes, single-layer wool weight is 220g / m2, width is 7, velvet roll length is 25, the carded wool net is sent to the forming area, and the fiber is combined with the bottom net by forming rollers and special needle plates to form a double-seam bottom net papermaking felt. The structure from top to bottom is, CT-300g, wire diameter type MD / CD is 0.55 / 0.24, C1-300g, wire diameter type MD / CD is 0.55 / 0.24, C2-300g, wire diameter type MD / CD is 0.55 / 0.24, CB-300g, wire diameter type MD / CD is 0.55 / 0.24, BT-44etx-220g, B1-67etx-420g, B2-100etx-280g, BB-67etx-280g, set the forward speed of the needling machine to 1.5m / min (within the range of 1m / min-2m / min), control the penetration depth of the needle to 10mm (within the range of 8mm-12mm), keep the longitudinal tension of the blanket at 50N (within the range of 40N-60N) and the transverse tension at 40N (within the range of 30N-50N) during the needling process, and try to control the number of broken needles to 0.

[0085] Use cleaning equipment to fully clean the double-seam blanket at a water pressure of 0.8MPa (within the range of 0.5MPa-1MPa) to remove surface impurities, and spray chemical treatment agent on the blanket surface at a spraying rate of 100g / m2. 2At the same time, vacuum suction is performed on the reverse side to maintain the vacuum degree at 65kPa (within the range of 50kPa-80kPa), so that the chemical treatment agent can fully enter the interior of the blanket. The hot oil roller is heated to 220 degrees to perform heat setting treatment on the blanket. The setting time is 12 minutes (within the range of 10 minutes-15 minutes). During the setting process, pre-pressing operation is performed with a pre-pressing pressure of 25N / cm 2 (at 20N / cm 2 -30N / cm 2 range).

[0086] Use testing equipment to test the strength, thickness (should be 5mm), and air permeability of the blanket. After testing, the air permeability after tufting is 215cfm, and the air permeability when put into storage is 145cfm. Carefully check the appearance of the blanket manually or with the help of testing equipment to check for defects, stains or uneven areas. No obvious problems were found after inspection, and the product meets production requirements.

[0087] Embodiment 4

[0088] Nylon fiber PA610 polymer is selected as the base mesh material, accounting for 52% of the total raw materials (satisfying the range requirement of 50%-55%), the base mesh weight is set to 1200g, PA6 polymer fiber is used as the fiber material, accounting for 51% of the total raw materials (within the range of 45%-50%), and an acidic neutralizer is prepared as an auxiliary agent, and its addition amount is diluted to the aqueous solution at 2.5% of the total raw material weight (in the range of 2%-3%).

[0089] 100% PA610 is clearly selected as the base mesh, the weight is set to 300, 1 / 3 twill weave is adopted, the wire diameter type MD / CD is 0.55 / 0.2*4, the weight of the middle 1 layer base fabric is 300, and 1 / 3 twill weave is also adopted, the wire diameter type MD / CD is 0.55 / 0.2*4, the weight of the middle 2 layer base fabric is 300, the weaving method is 1 / 3 twill weave, and the wire diameter type MD / CD is 0.55 / 0.2* 4. The weight of the bottom base fabric is 300, 1 / 3 twill weave, the wire diameter type MD / CD is 0.55 / 0.2*4. During the weaving of the bottom base fabric, the warp tension is maintained at 40N (within the range of 30N-50N), the weft tension is 30N (within the range of 20N-40N), the weft density is set to 50 strands / 10cm, the side support width is 10mm, the width of the bottom mesh produced this time is 2m, and the length is 100m.

[0090] 44etx, 67etx, and 100etx are selected as the raw materials for the double-seam pulp blanket, and an acid neutralizer is added at 2% of the total raw material weight to mix, the fiber is wetted before combing, and an acid neutralizer is added again at 2% of the total raw material weight, such as Figure 2Taking 44etx fiber as an example, when it is processed in the No. 1 wool combining machine of Class A on 2024 / 3 / 1, the initial humidity is 12%, the water addition amount is 500L, the water addition method of spraying is adopted, the solution concentration is 2%, the wetting uniformity is good, the water addition time is 35 minutes, and the fiber moistened with the acid neutralizer is sent into the carding machine by using a carding device, and the main cylinder speed of the carding machine is set to 1200rpm (within the range of 1000rpm-1500rpm), and the spacing between the working roller and the cylinder is 0.8mm (within the range of 0.5mm-1mm). During the pre-needling process, Figure 3 Taking 44etx fiber as an example, when processed by the pre-needling machine, the fiber content is 100% and the density is 44.1g / cm 3 , length is 90mm (within the range of 55-128mm), elongation is 17.3mm, solution concentration is 1%, spray addition method is adopted, wetting uniformity is good, water addition time is 35 minutes, single layer gross weight is 220g / m 2 , width 7, velvet roll length 25, set the forward speed of the needling machine to 1.5m / min (within the range of 1m / min-2m / min), control the penetration depth of the needle to 10mm (within the range of 8mm-12mm), and during the needling process, keep the longitudinal tension of the blanket at 50N (within the range of 40N-60N), the transverse tension at 40N (within the range of 30N-50N), and try to control the number of broken needles to 0.

[0091] Use cleaning equipment to fully clean the double-seam blanket at a water pressure of 0.8MPa (within the range of 0.5MPa-1MPa) to remove surface impurities, and spray chemical treatment agent on the blanket surface at a spraying rate of 100g / m2. 2 At the same time, vacuum suction is performed on the reverse side to maintain the vacuum degree at 65kPa (within the range of 50kPa-80kPa), so that the chemical treatment agent can fully enter the interior of the blanket. The hot oil roller is heated to 220 degrees to perform heat setting treatment on the blanket. The setting time is 12 minutes (within the range of 10 minutes-15 minutes). During the setting process, pre-pressing operation is performed with a pre-pressing pressure of 25N / cm 2 (at 20N / cm 2 -30N / cm 2 range).

[0092] Use testing equipment to test the strength, thickness (should be 5mm), and air permeability of the blanket. After testing, the air permeability after tufting is 225cfm, and the air permeability when put into storage is 155cfm. Carefully check the appearance of the blanket manually or with the help of testing equipment to check for defects, stains or uneven areas. No obvious problems were found after inspection, and the product meets production requirements.

[0093] Effect: The above two embodiments demonstrate the production and processing of acid-resistant papermaking felts. In each embodiment, except for the different content of fiber material PA6, other parameters remain unchanged. The PA6 content in the comparative example is 48%, in the third embodiment it is 45%, and in the fourth embodiment it is 51%. Different PA6 contents show different physical properties. In terms of air permeability, the air permeability of the comparative example after velveting is 220cfm, and the air permeability when put into storage is 150cfm. The air permeability of the third embodiment after velveting is 215cfm, and the air permeability when put into storage is 145 cfm, the air permeability of Example 4 after pile is 225cfm, and the air permeability when put into storage is 155cfm. It can be seen that with the change of the PA6 content of the fiber material, the air permeability physical properties of the felt also change accordingly, which provides a reference for selecting the appropriate fiber material content according to the actual papermaking needs. At the same time, the felts produced in each embodiment meet the production requirements after appearance inspection, can ensure normal use in the papermaking process, and effectively avoid the appearance defects of printing and scratching on the paper due to the surface problems of the felt, thereby improving the appearance quality and production qualification rate of the paper.

[0094] Embodiment 5

[0095] Nylon fiber PA610 polymer is selected as the base mesh material, accounting for 52% of the total raw materials (satisfying the range requirement of 50%-55%), the base mesh weight is set to 1200g, PA6 polymer fiber is used as the fiber material, accounting for 48% of the total raw materials (within the range of 45%-50%), and an acidic neutralizer is prepared as an auxiliary agent, and its addition amount is diluted to the aqueous solution at 2% of the total raw material weight (in the range of 2%-3%).

[0096] 100% PA610 is clearly selected as the base mesh, the surface base fabric weight is set to 300, 1 / 3 twill weave is adopted, the wire diameter type MD / CD is 0.55 / 0.2*4, the middle 1st layer base fabric weight is 300, 1 / 3 twill weave is also adopted, the wire diameter type MD / CD is 0.55 / 0.2*4, the middle 2nd layer base fabric weight is 300, the weaving method is 1 / 3 twill weave, and the wire diameter type MD / CD is 0.55 / 0. 2*4, bottom base fabric weight 300, 1 / 3 twill weave, wire diameter type MD / CD is 0.55 / 0.2*4, during the weaving of the bottom base fabric, maintain the warp tension at 40N (within the range of 30N-50N), the weft tension at 30N (within the range of 20N-40N), set the weft density to 50 strands / 10cm, the side support width is 10mm, the width of the bottom mesh produced this time is 2m, and the length is 100m.

[0097] 44etx, 67etx, and 100etx are selected as the raw materials for the double-seam pulp blanket, and an acid neutralizer is added at 2% of the total raw material weight to mix, the fiber is wetted before combing, and an acid neutralizer is added again at 2% of the total raw material weight, such as Figure 2 Taking 44etx fiber as an example, when it is processed in the No. 1 wool combining machine of Class A on 2024 / 3 / 1, the initial humidity is 12%, the water addition amount is 500L, the water addition method of spraying is adopted, the solution concentration is 2%, the wetting uniformity is good, the water addition time is 35 minutes, and the fiber moistened with the acid neutralizer is sent into the carding machine by using a carding device, and the main cylinder speed of the carding machine is set to 1200rpm (within the range of 1000rpm-1500rpm), and the spacing between the working roller and the cylinder is 0.8mm (within the range of 0.5mm-1mm). During the pre-needling process, Figure 3 Taking 44etx fiber as an example, when processed by the pre-needling machine, the fiber content is 100% and the density is 44.1g / cm 3 , length is 90mm (within the range of 55-128mm), elongation is 17.3mm, solution concentration is 1%, spray addition method is adopted, wetting uniformity is good, water addition time is 35 minutes, single layer gross weight is 220g / m 2 , width 7, pile roll length 25, the carded wool net is sent to the forming area, and the fiber is combined with the bottom net by forming rollers and special needle plates to form a double-seam bottom net papermaking felt. Its structure from top to bottom is: CT-300g, wire diameter type MD / CD is 0.55 / 0.24, C1-300g, wire diameter type MD / CD is 0.55 / 0.24, C2-300g, wire diameter type MD / CD is 0.55 / 0.24, CB-300g, wire diameter type MD / CD is 0.55 / 0.24, BT-44e tx-220g, B1-67etx-420g, B2-100etx-280g, BB-67etx-280g, set the forward speed of the needling machine to 1.5m / min (within the range of 1m / min-2m / min), control the penetration depth of the needle to 10mm (within the range of 8mm-12mm), and during the needling process, keep the longitudinal tension of the blanket at 50N (within the range of 40N-60N), and the transverse tension at 40N (within the range of 30N-50N), and try to control the number of broken needles to 0.

[0098] Use cleaning equipment to fully clean the double-seam blanket at a water pressure of 0.8MPa (within the range of 0.5MPa-1MPa) to remove surface impurities, and spray chemical treatment agent on the blanket surface at a spraying rate of 100g / m2. 2At the same time, vacuum suction is performed on the reverse side to maintain the vacuum degree at 65kPa (within the range of 50kPa-80kPa), so that the chemical treatment agent can fully enter the interior of the blanket. The hot oil roller is heated to 220 degrees to perform heat setting treatment on the blanket. The setting time is 12 minutes (within the range of 10 minutes-15 minutes). During the setting process, pre-pressing operation is performed with a pre-pressing pressure of 25N / cm 2 (at 20N / cm 2 -30N / cm 2 range).

[0099] Use testing equipment to test the strength, thickness (should be 5mm), and air permeability of the blanket. After testing, the air permeability after tufting is 210cfm, and the air permeability when put into storage is 140cfm. Carefully check the appearance of the blanket manually or with the help of testing equipment to check for defects, stains or uneven areas. No obvious problems were found after inspection, and the product meets production requirements.

[0100] Embodiment 6

[0101] Nylon fiber PA610 polymer is selected as the base mesh material, accounting for 52% of the total raw materials (satisfying the range requirement of 50%-55%), the base mesh weight is set to 1200g, PA6 polymer fiber is used as the fiber material, accounting for 48% of the total raw materials (within the range of 45%-50%), and an acid neutralizer is prepared as an auxiliary agent, and its addition amount is diluted to the aqueous solution at 3% of the total raw material weight (in the range of 2%-3%).

[0102] 100% PA610 is clearly selected as the base mesh, the surface base fabric weight is set to 300, 1 / 3 twill weave is adopted, the wire diameter type MD / CD is 0.55 / 0.2*4, the middle 1st layer base fabric weight is 300, 1 / 3 twill weave is also adopted, the wire diameter type MD / CD is 0.55 / 0.2*4, the middle 2nd layer base fabric weight is 300, the weaving method is 1 / 3 twill weave, and the wire diameter type MD / CD is 0.55 / 0. 2*4, bottom base fabric weight 300, 1 / 3 twill weave, wire diameter type MD / CD is 0.55 / 0.2*4, during the weaving of the bottom base fabric, maintain the warp tension at 40N (within the range of 30N-50N), the weft tension at 30N (within the range of 20N-40N), set the weft density to 50 strands / 10cm, the side support width is 10mm, the width of the bottom mesh produced this time is 2m, and the length is 100m.

[0103] 44etx, 67etx, and 100etx are selected as the raw materials for the double-seam pulp blanket, and an acid neutralizer is added at 3% of the total raw material weight to mix, the fiber is wetted before combing, and an acid neutralizer is added again at 3% of the total raw material weight, such as Figure 2Taking 44etx fiber as an example, when it is processed in the No. 1 wool combining machine of Class A on 2024 / 3 / 1, the initial humidity is 12%, the water addition amount is 500L, the water addition method of spraying is adopted, the solution concentration is 3%, the wetting uniformity is good, the water addition time is 35 minutes, and the fiber moistened with the acid neutralizer is sent into the carding machine by using a carding device, and the main cylinder speed of the carding machine is set to 1200rpm (within the range of 1000rpm-1500rpm), and the spacing between the working roller and the cylinder is 0.8mm (within the range of 0.5mm-1mm). During the pre-puncture process, if Figure 3 Taking 44etx fiber as an example, when processed by the pre-needling machine, the fiber content is 100% and the density is 44.1g / cm 3 , length is 90mm (within the range of 55-128mm), elongation is 17.3mm, solution concentration is 1%, spray addition method is adopted, wetting uniformity is good, water addition time is 35 minutes, single layer gross weight is 220g / m 2 , width 7, pile roll length 25, the carded wool net is sent to the forming area, and the fiber is combined with the bottom net by forming rollers and special needle plates to form a double-seam bottom net papermaking felt. Its structure from top to bottom is: CT-300g, wire diameter type MD / CD is 0.55 / 0.24, C1-300g, wire diameter type MD / CD is 0.55 / 0.24, C2-300g, wire diameter type MD / CD is 0.55 / 0.24, CB-300g, wire diameter type MD / CD is 0.55 / 0.24, BT-4 4etx-220g, B1-67etx-420g, B2-100etx-280g, BB-67etx-280g, set the forward speed of the needle loom to 1.5m / min (within the range of 1m / min-2m / min), control the penetration depth of the needle to 10mm (within the range of 8mm-12mm), and keep the longitudinal tension of the blanket at 50N (within the range of 40N-60N) and the transverse tension at 40N (within the range of 30N-50N during the needling process. Try to control the number of broken needles to 0.

[0104] Use cleaning equipment to fully clean the double-seam blanket at a water pressure of 0.8MPa (within the range of 0.5MPa-1MPa) to remove surface impurities, and spray chemical treatment agent on the blanket surface at a spraying rate of 100g / m2. 2 At the same time, vacuum suction is performed on the reverse side to maintain the vacuum degree at 65kPa (within the range of 50kPa-80kPa), so that the chemical treatment agent can fully enter the interior of the blanket. The hot oil roller is heated to 220 degrees to perform heat setting treatment on the blanket. The setting time is 12 minutes (within the range of 10 minutes-15 minutes). During the setting process, pre-pressing operation is performed with a pre-pressing pressure of 25N / cm 2 (at 20N / cm 2 -30N / cm2 range).

[0105] Use testing equipment to test the strength, thickness (should be 5mm), and air permeability of the blanket. After testing, the air permeability after tufting is 230cfm, and the air permeability when put into storage is 160cfm. Carefully check the appearance of the blanket manually or with the help of testing equipment to check for defects, stains or uneven areas. No obvious problems were found after inspection, and the product meets production requirements.

[0106] Effect: The above two embodiments demonstrate the production and processing of acid-resistant papermaking felts. In each embodiment, except for the addition amount of the auxiliary acid neutralizer, other parameters remain unchanged. The addition amount of the auxiliary agent in the comparative example is 2.5% of the total raw material weight, 2% in Example 5, and 3% in Example 6. Different addition amounts of auxiliary agents show different physical properties. In terms of air permeability, the air permeability of the comparative example after velveting is 220cfm, and the air permeability when put into storage is 150cfm. The air permeability of Example 5 after velveting is 210cfm, and the air permeability when put into storage is 140cfm. The air permeability of Example 6 after velveting is The air permeability is 230cfm, and the air permeability is 160cfm when it is put into storage. It can be seen that with the change of the amount of additive acid neutralizer added, the physical properties of the air permeability of the felt also change accordingly, which provides a reference for selecting the appropriate amount of additive added according to the actual papermaking needs. At the same time, the felts produced in each embodiment meet the production requirements after appearance inspection and can ensure normal use in the papermaking process. In addition, the difference in the amount of additive added will also affect the tolerance of the felt in an acidic environment. Although the specific degree of influence needs to be clarified by subsequent long-term tests, the adjustment of the amount of additive added can be used as an important factor in optimizing the performance of papermaking felts as a whole.

[0107] The specific contents are shown in the following table:

[0108]

[0109]

[0110] As described in the table above, except for the different contents of nylon fiber PA610 of the base mesh material in Examples 1 to 2, other parameters remain unchanged. The PA610 content in the comparative example is 52%, in Example 1 it is 50%, and in Example 2 it is 55%. Different PA610 contents show different physical properties. In terms of air permeability, the air permeability of the comparative example after velvet is 220cfm, and the air permeability when put into storage is 150cfm. The air permeability of Example 1 after velvet is 210cfm, and the air permeability when put into storage is 140cfm. The air permeability of Example 2 after spiking is 230cfm, and the air permeability when put into storage is 160cfm. It can be seen that with the change of the content of nylon fiber PA610 in the base mesh material, the air permeability physical properties of the blanket also change accordingly. Except for the different content of fiber material PA6 in Examples 3 to 4, other parameters remain unchanged. The PA6 content in the comparative example is 48%, 45% in Example 3, and 51% in Example 4. Different PA6 contents show different physical performance effects. In terms of air permeability, the air permeability of the comparative example after spiking is 230cfm, and the air permeability of the blanket after spiking is 160cfm. The air permeability of the embodiment 3 after tufting is 215cfm, and the air permeability when entering the warehouse is 145cfm. The air permeability of the embodiment 4 after tufting is 225cfm, and the air permeability when entering the warehouse is 155cfm. It can be seen that with the change of the content of the fiber material PA6, the air permeability and physical properties of the blanket also change accordingly. Except for the addition amount of the auxiliary acid neutralizer in the embodiments 5 to 6, the other parameters remain unchanged. The addition amount of the auxiliary agent in the comparative example is 2.5% of the total raw material weight. %, 2% in Example 5, and 3% in Example 6. Different amounts of additives added show different physical property effects. In terms of air permeability, the air permeability of the control example after plucking is 220cfm, and the air permeability when put into storage is 150cfm. The air permeability of Example 5 after plucking is 210cfm, and the air permeability when put into storage is 140cfm. The air permeability of Example 6 after plucking is 230cfm, and the air permeability when put into storage is 160cfm. With the change of the amount of additive acid neutralizer added, the air permeability physical properties of the blanket also change accordingly.

[0111] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. An acid-resistant papermaking felt, characterized in that: It is composed of the following ingredients: base mesh material nylon fiber, fiber material, and additives; The base mesh material nylon fiber PA610 is nylon fiber PA610 polymer; The fiber material PA6 is PA6 polymer fiber; The auxiliary agent is an acid neutralizer.

2. The acid-resistant papermaking felt according to claim 1, characterized in that: The base net material nylon fiber PA610 is 50%-55% of the total raw materials, and the base net weighs 1200g.

3. The acid-resistant papermaking felt according to claim 1, characterized in that: The fiber material PA6 is PA6 polymer fiber, accounting for 45%-50% of the total raw materials.

4. The acid-resistant papermaking felt according to claim 1, characterized in that: The auxiliary agent is an acidic neutralizer as an auxiliary agent, and the acidic neutralizer is added in an amount of 2%-3% of the total raw material weight to dilute it into the aqueous solution.

5. A method for producing and processing an acid-resistant papermaking felt, characterized in that: The specific steps of this method are: S1, bottom mesh weaving S1.

1. Base mesh selection: 100% PA610 is used as the base mesh; S1.2, base fabric parameters S1.3, surface base fabric: weight 300, 1 / 3 twill weave, wire diameter type MD / CD 0.55 / 0.2*4; S1.4, middle 1-layer base fabric: weight 300, 1 / 3 twill weave, wire diameter type MD / CD is 0.55 / 0.2*4; S1.5, middle 2-layer base fabric: weight 300, 1 / 3 twill weave, wire diameter type MD / CD is 0.55 / 0.2*4; S1.6, bottom base fabric: weight 300, 1 / 3 twill weave, wire diameter type MD / CD is 0.55 / 0.2*4; S2. Acupuncture process S2.1 Fiber selection and mixing Select 44etx, 67etx and 100etx as the raw materials of the double-seam pulp blanket, add an acid neutralizer according to 2% of the total raw material weight and mix; S2.2, Fiber carding and pile formation The fibers were wetted before combing and an acid neutralizer was added again at 2% of the total raw material weight; During the wool-combining process, when the wool-combining machine processes 44etx fibers, the initial humidity is 12%, the amount of water added is 500L, the water addition method is spraying, the solution concentration is 2%, the wetting uniformity is good, and the water addition time is 35 minutes; S2.3, carding fibers The fibers moistened with acid neutralizer are fed into the carding machine using a carding device. The main cylinder speed of the carding machine is set to 1000-1500 rpm, and the spacing between the working roller and the cylinder is 0.5-1 mm. S2.4, velvet roll forming The carded wool web is sent to the forming area, where the fibers are combined with the bottom web using forming rollers and special needle plates; S2.5, Blanket formation The double-seamed bottom mesh papermaking felt is composed of 1+1+1+1 four-layer bottom mesh, which is compounded by special needle-laying process and needle-punching process. The structure from top to bottom is: CT-300g, wire diameter type MD / CD is 0.55 / 0.24, C1-300g, wire diameter type MD / CD is 0.55 / 0.24, C2-300g, wire diameter type MD / CD is 0.55 / 0.24, CB-300g, wire diameter type MD / CD is 0.55 / 0.24, BT-44etx-220g, B1-67etx-420g, B2-100etx-280g, BB-67etx-280g; S3, finalization and preprocessing S3.

1. Cleaning: Use cleaning equipment to thoroughly clean the double-seamed blanket at a water pressure of 0.5MPa-1MPa to remove surface impurities; S3.2, Chemical treatment agent spraying and suction Spray chemical treatment agent on the surface of the blanket, the spraying amount of chemical treatment agent is 100g / m2 2 At the same time, through vacuum suction on the reverse side, the vacuum degree is maintained at 50kPa-80kPa, so that the chemical treatment agent can fully enter the interior of the blanket; S3.3, Heat setting and pre-pressing Heat the hot oil roller to 220 degrees to heat-set the blanket for 10-15 minutes. During the setting process, pre-pressing is performed with a pressure of 20N / cm. 2 -30N / cm 2 ; S4. Detection S4.

1. Physical performance test The strength, thickness and air permeability of the blanket were tested using testing equipment. The air permeability after velvet was 220cfm and the air permeability before storage was 150cfm. S4.

2. Appearance inspection Carefully inspect the felt for flaws, stains, or uneven areas, either manually or with the aid of inspection equipment.

6. The method for producing and processing an acid-resistant papermaking felt according to claim 5, characterized in that: The S1.6 weaving control parameters: Tension: During the weaving process, keep the warp tension at 30N-50N and the weft tension at 20N-40N; Weft density: Set the weft density to 50 strands / 10cm; Temple support setting: Temple support width is 10mm; Size: Determine the size of the bottom net according to product requirements, for example, the width is 2m and the length is 100m.

7. The method for producing and processing an acid-resistant papermaking felt according to claim 5, characterized in that: In the process of pre-needling, the pre-needling machine processes 44etx fiber, and the fiber content is 100% and the density is 44.1g / cm 3 , length 55-128mm, elongation 17.3mm, solution concentration 1%, adding method is spraying, wetting uniformity is good, adding water for 35 minutes, single layer gross weight 220g / m 2 , width 7, velvet roll length 25.

8. The method for producing and processing an acid-resistant papermaking felt according to claim 5, characterized in that: The acupuncture process control parameters: Forward speed: Set the forward speed of the needle loom to 1m / min-2m / min; Puncture depth: Control the puncture depth of the needle to 8mm-12mm; Tension: During the needling process, the longitudinal tension of the blanket is maintained at 40N-60N, and the transverse tension is maintained at 30N-50N; Number of broken needles: controlled to 0.

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