阅读说明：本技术 一种筛网及其制作工艺 (Screen mesh and manufacturing process thereof ) 是由 张朝志 于 2021-07-23 设计创作，主要内容包括：本发明提出一种筛网及其制作工艺,涉及筛网技术领域。此筛网的制作工艺包括如下步骤：将树脂于80-100℃的温度下加热熔融、消泡后得到树脂溶液一,再将所述树脂溶液一挤入模具中冷却固化后获得网体架；将所述网体架放置于金属支撑架的安装孔内,并通过二次浇注成型工艺得到一体成型的筛网。该筛网制作工艺简单易操作,且能耗较低,分步的加工方式可以纠正每道工序中所存在的问题,进而提高筛网的成品率,避免生产过程中产生废料,节约资源。另一方面,本发明实施例利用上述筛网的制作工艺所制得的筛网,具有耐腐蚀性好、开孔率高、脱水效果好、使用寿命长、矿选回收率高等优点。(The invention provides a screen and a manufacturing process thereof, and relates to the technical field of screens. The manufacturing process of the screen comprises the following steps: heating and melting resin at the temperature of 80-100 ℃, defoaming to obtain a resin solution I, extruding the resin solution I into a mould, cooling and solidifying to obtain a net body frame; and placing the net body frame in a mounting hole of a metal support frame, and obtaining the integrally formed screen by a secondary casting molding process. The screen is simple in manufacturing process and easy to operate, energy consumption is low, the problems in each procedure can be corrected through a step-by-step processing mode, the yield of the screen is improved, waste materials are prevented from being generated in the production process, and resources are saved. On the other hand, the screen prepared by the manufacturing process of the screen has the advantages of good corrosion resistance, high aperture ratio, good dehydration effect, long service life, high ore dressing recovery rate and the like.)

1. The manufacturing process of the screen is characterized by comprising the following steps of:

heating and melting resin at the temperature of 80-100 ℃, defoaming to obtain a resin solution I, extruding the resin solution I into a mould, cooling and solidifying to obtain a net body frame; and placing the net body frame in a mounting hole of a metal support frame, and obtaining the integrally formed screen by a secondary casting molding process.

2. The process of making a screen according to claim 1, wherein the resin is polyurethane.

3. The process for manufacturing the screen mesh according to claim 2, further comprising polyoxymethylene, wherein the solid mass ratio of the polyurethane to the polyoxymethylene is (7.5-8.5): 1.

4. The screen cloth manufacturing process as claimed in claim 1, wherein the resin solution is extruded into the mold after being heated to 190-220 ℃.

5. The process for making a screen panel according to claim 1, wherein said two-shot molding process comprises the steps of: and (3) preserving the temperature of the resin solution II at 80-100 ℃ for 12 hours, adding a curing agent, uniformly stirring to obtain a mixed solution, uniformly filling the mixed solution into a gap between the net rack body and the metal support frame, and demolding, curing and molding to form the integrally molded screen.

6. The screen panel making process of claim 5, wherein said curing agent is DMDC, PACM, MOCA Moca or IPDA curing agent.

7. The manufacturing process according to claim 5, wherein in the step of curing and molding, the mold is removed after the screen mesh is left for 30 minutes at room temperature, and the screen mesh is integrally molded after curing and molding.

8. The manufacturing process as claimed in claim 5, wherein the curing and forming temperature is 100 ℃ and 110 ℃ and the time is 11-12 hours.

9. The manufacturing process of claim 5, wherein 8-10 wt% of microcrystalline cellulose is added into the second resin solution, uniformly stirred and subjected to heat preservation treatment.

10. A screen made according to the process of any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of screens, in particular to a screen and a manufacturing process thereof.

Background

In metallurgical mine beneficiation, the particle size composition of a concentrate product is a decisive factor of the quality of the concentrate, so that the classification of fine materials in the beneficiation process of a ferrous metallurgical mine is a very important process. In the precise wet classification of fine-grained materials, the fine-grained mineral classification particle size is becoming increasingly finer, the classification efficiency requirements are increasing and the demands on the screening capacity are increasing, which puts higher demands not only on the screening technology but also in particular on the screening capacity and its main facilities, such as screens, vibrators, distributors and feeders.

The sieve plate made of metal materials is mostly processed in a mechanical mode, such as steel plate punching, steel wire weaving, steel wire welding and the like. With the development of new materials, the sieve plate made of stainless steel is gradually applied in the washing industry, and replaces the sieve plate made of common steel with poor wear resistance. However, the metal sieve plates have the defects of non-corrosion resistance, short service life and the like in the using process, so that a large amount of resources are wasted.

Disclosure of Invention

The invention aims to provide a manufacturing process of a screen, which can improve the corrosion resistance of the screen and prolong the service life of the screen.

Another object of the present invention is to provide a screen panel which is highly self-cleaning and has good corrosion and abrasion resistance.

The technical problem to be solved by the invention is realized by adopting the following technical scheme.

On one hand, the invention provides a manufacturing process of a screen, which comprises the following steps: heating and melting resin at the temperature of 80-100 ℃, defoaming to obtain a resin solution I, extruding the resin solution I into a mould, cooling and solidifying to obtain a net body frame; and placing the net body frame in a mounting hole of a metal support frame, and obtaining the integrally formed screen by a secondary casting molding process.

In another aspect, the present invention is a screen manufactured by the above-described screen manufacturing process.

The screen and the manufacturing process thereof provided by the embodiment of the invention at least have the following beneficial effects:

in the manufacturing process of the screen, the metal rods are welded with each other to manufacture the latticed metal support frame, and the latticed holes are used as mounting holes of the screen body frame. The metal support frame has good tensile strength, and the mechanical strength and the toughness of the screen can be improved by using the metal support frame as a framework of the screen, so that the service life of the screen is prolonged. The metal support frame can be applied to different tools, and the use material of the metal support frame can be adjusted to meet the use requirement of the metal support frame. The added defoaming agent can remove bubbles generated in the stirring process and improve the strength of the net body frame. Moreover, the forming of the net body frame and the screen is completed in two steps, the processing mode can correct the problems in the working procedure, the product problems are reduced as much as possible, and the waste caused by one-step forming is avoided. And different tools can flexibly replace corresponding metal support frames and net body frames with different apertures according to the requirements of the screen, so that the processing is convenient, and the production rate is improved. Moreover, due to the step-by-step forming mode, when the screen has a problem, the screen can be repaired by using a resin material, so that the screen is convenient to maintain and treat at the later stage.

On the other hand, the screen cloth manufactured by the manufacturing process of the screen cloth has good wear resistance and corrosion resistance, and the service life of the screen cloth can be prolonged by coating the resin material outside the metal support frame. And the resin material, especially polyurethane, is an excellent sound wave absorbing material and has good silencing effect. The noise that the sieve machine sent when normal work is obviously reduced than the metal screen, has improved on-the-spot workman's operational environment. The surface of the resin screen is flat and smooth, so that the adhesion of moist particles can be effectively avoided, and the self-cleaning property is high. And the aperture ratio of the screen is higher, and the dehydration effect and the ore dressing recovery rate are greatly improved. Moreover, the resin screen is light in weight, small in dynamic load and small in power consumption of the screening machine, the one-time screening processing capacity is increased, and the production efficiency is improved.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to specific examples.

The invention provides a manufacturing process of a screen, which comprises the following steps: heating and melting resin at the temperature of 80-100 ℃, defoaming to obtain a resin solution I, extruding the resin solution I into a mould, cooling and solidifying to obtain a net body frame; and placing the net body frame in a mounting hole of a metal support frame, and obtaining the integrally formed screen by a secondary casting molding process.

In detail, the metal rods are welded with each other to form a latticed metal support frame, and the latticed holes are used as mounting holes of the net body frame. The metal support frame has good tensile strength, and the mechanical strength and the toughness of the screen can be improved by using the metal support frame as a framework of the screen, so that the service life of the screen is prolonged. The metal support frame can be applied to different tools, and the use material of the metal support frame can be adjusted to meet the use requirement of the metal support frame. Alternatively, the metal rod may be a manganese steel rod, a 304 stainless steel rod, a carbon steel rod, or the like, without limitation. Heating and melting a resin material with the melting point lower than 80 ℃ at the temperature of 80-100 ℃ to obtain a resin solution I, adding a defoaming agent to remove bubbles generated in the stirring process, and avoiding that the net body frame is low in strength due to the existence of the bubbles after being formed and even becomes a defective product.

In the embodiment of the invention, the adopted resin is a mixture of polyurethane and polyformaldehyde. Among them, polyurethane is a high molecular material containing a large number of urethane groups on the main chain, and is a block copolymer of hard blocks and soft blocks alternating by reacting isocyanate with polyol (polyether, polyester). Generally, the soft segment is composed of a polyol, and the soft segment composed of a polyol has various conformations at normal temperature, and is called a soft segment. The rigid chain segment with aromatic group, carbamido group and urethane group is obtained by the reaction of micromolecule chain extender (cross linker) such as dihydric alcohol, diamine and the like and diisocyanate, and the conformation of the rigid chain segment is not easy to change, so the rigid chain segment is called as a hard segment. Polyurethane is a material between rubber and plastic, and has various raw materials, various formulas and wide adjustable range. The polyurethane has a wide hardness range, and the modulus is as low as 10 Shore A hardness and as high as 85 Shore D hardness. The polyurethane elastomer has the characteristics of strong wear resistance, good elasticity, high bearing capacity, oil resistance, excellent mechanical property and the like, and the excellent performance greatly prolongs the service life of the polyurethane screen, wherein the service life of the polyurethane screen is 8-10 times that of a metal screen, 3 times that of a stainless steel screen and 3.9 times that of natural rubber. The polyurethane screen has the characteristics of high screening efficiency, self-cleaning performance, no hole blockage and the like.

Polyformaldehyde has high mechanical properties such as strength, modulus, wear resistance, toughness, fatigue resistance and creep resistance, and also has excellent electrical insulation, solvent resistance and processability, and is one of five common engineering plastics. The resin solution I is mixed with polyurethane to prepare a mixed system, so that the properties of the resin can be improved, and the mechanical property, creep resistance, fatigue resistance, wear resistance, self-lubrication property, chemical resistance and the like of the screen are improved. Furthermore, through a plurality of times of test analysis, when the solid mass ratio of the polyurethane to the polyformaldehyde is (7.5-8.5):1, the mechanical property, the wear resistance and the corrosion resistance of the composite material are excellent.

Further, in the embodiment of the invention, the first resin solution is heated to 190-220 ℃, and then extruded into a mold to be cooled and cured to obtain the net body frame. The viscosity of the first resin solution can be reduced by heating the first resin solution to 190-220 ℃, and the fluidity of the first resin solution is improved, so that the first resin solution can fill the die cavity, and the probability of one-time integral molding of the grid body is improved. Moreover, the polyformaldehyde can be further melted at the temperature, the compatibility of mixed raw materials is improved, the quality of the net body frame is uniform, and the mechanical property of the net body frame is improved.

And placing the produced net body frame in the mounting hole, and obtaining the integrally formed screen by a secondary casting forming process. In detail, the secondary casting molding process comprises the following steps: and (3) preserving the temperature of the resin solution II at 80-100 ℃ for 12 hours, adding a curing agent, uniformly stirring to obtain a mixed solution, uniformly filling the mixed solution into a gap between the net rack body and the metal support frame, and demolding, curing and molding to form the integrally molded screen. The resin solution II is subjected to heat preservation treatment, so that the resin solution II can be kept at a higher fluidity, later filling into gaps is facilitated, pores and defects in the screen are reduced, and the strength of the screen is improved. The curing agent can be added to accelerate the curing and forming, and the curing agent selected in the invention is DMDC, PACM, MOCA or IPDA curing agent. The resin can reduce the curing temperature of the resin in the presence of DMDC, PACM or IPDA curing agent, thereby accelerating the curing of polyurethane and improving the hardness and tensile strength of the polyurethane.

Further, standing for 30 minutes at room temperature, then removing the molds in the sieve pores in the net body frame, and then carrying out curing molding to obtain the integrally molded sieve. Standing for 30 minutes at room temperature to ensure that the product is initially cooled to have certain hardness, and is convenient to transfer to carry out a curing and forming process. In detail, the temperature for curing and molding is 100-110 ℃, and the time is 11-12 hours.

In order to solve the problem of post-treatment of the waste screen, in the embodiment of the invention, 8-10 wt% of microcrystalline cellulose is added into a resin solution II and is uniformly stirred, and then heat preservation treatment is carried out. Cellulose is a natural polymer with the largest reserve on the earth, and is a good raw material for preparing biodegradable materials as a renewable natural material. The microcrystalline cellulose is a product of natural cellulose which is hydrolyzed to the limit polymerization degree by acid, is odorless and tasteless, has the particle size of about 2-80 mu m generally, has the advantages of small density, high modulus, reproducibility, degradability, wide source and the like, can improve the degradability of the resin on the outer layer of the screen mesh, and can be used as a reinforcing agent of a resin material to improve the performance of the material. However, too much microcrystalline cellulose affects the mechanical strength of the entire screen, and therefore the content of microcrystalline cellulose is 8 to 10 wt%.

The process is simple and easy to operate, the forming of the net body frame and the screen is completed in two steps, the processing mode can correct the problems in each procedure, the yield of the screen is improved, waste materials generated in the production process are avoided, and resources are saved. And different tools can flexibly replace corresponding metal support frames and net body frames with different apertures according to requirements on the rigidity, the aperture and the like of the screen, so that the processing is convenient, and the production rate is improved.

On the other hand, the screen cloth manufactured by the manufacturing process of the screen cloth has the advantages of acid and alkali resistance, corrosion resistance, high aperture ratio, good dehydration effect, long service life and the like. And the surface of the resin screen is flat and smooth, so that the adhesion of damp particles can be effectively avoided, and the self-cleaning property is higher. Moreover, the resin screen is light in weight, small in dynamic load and small in power consumption of the screening machine, the one-time screening processing capacity is increased, and the production efficiency is improved.

The features and properties of the present invention are described in further detail below with reference to examples.

Example 1

The embodiment of the invention provides a manufacturing process of a screen, which comprises the following steps:

manufacturing a metal support frame: manufacturing a manganese steel bar into a metal support frame in a welding mode, wherein the metal support frame is in a square grid shape, and a space in the middle is a mounting hole;

manufacturing a net body frame: heating and melting resin at the temperature of 80 ℃ to obtain a resin solution, adding 1 wt% of defoaming agent into the resin solution, and uniformly stirring to obtain a resin solution I; then, the resin solution I is heated to 190 ℃ and then extruded into a mould, and a net body frame can be obtained after cooling and solidification;

manufacturing a screen mesh: and (2) putting the net rack body into a mounting hole on a metal support frame, adding 8 wt% of microcrystalline cellulose into a resin solution II, uniformly stirring, then preserving the temperature of the resin solution II at 80 ℃ for 12 hours, adding a DMDC curing agent, uniformly stirring to obtain a mixed solution, uniformly filling a gap between the net rack body and the metal support frame with the mixed solution, standing at room temperature for 30 minutes, removing a mold, then curing at 100 ℃ for 11 hours, and forming an integrally-formed screen after forming.

The resin in this example is a mixture of polyurethane and polyoxymethylene, and the solid mass ratio of polyurethane to polyoxymethylene is 7.5: 1.

Example 2

The embodiment of the invention provides a manufacturing process of a screen, which comprises the following steps:

manufacturing a metal support frame: manufacturing a metal support frame by welding a 304 stainless steel bar, wherein the metal support frame is in a square grid shape, and a space in the middle is a mounting hole;

manufacturing a net body frame: heating and melting resin at the temperature of 100 ℃ to obtain a resin solution, adding 2 wt% of defoaming agent into the resin solution, and uniformly stirring to obtain a resin solution I; then, the resin solution I is heated to 220 ℃ and then extruded into a mould, and a net body frame can be obtained after cooling and solidification;

manufacturing a screen mesh: and (2) putting the net rack body into a mounting hole on a metal support frame, adding 10 wt% of microcrystalline cellulose into a resin solution II, uniformly stirring, then preserving the temperature of the resin solution II at 100 ℃ for 12 hours, adding a PACM (polyaluminium chloride) curing agent, uniformly stirring to obtain a mixed solution, uniformly filling gaps between the net rack body and the metal support frame with the mixed solution, standing at room temperature for 30 minutes, removing a mold, then curing at 110 ℃ for 12 hours, and forming an integrally-formed screen after forming.

The resin in this example is a mixture of polyurethane and polyoxymethylene, and the solid mass ratio of polyurethane to polyoxymethylene is 8.5: 1.

Example 3

The embodiment of the invention provides a manufacturing process of a screen, which comprises the following steps:

manufacturing a metal support frame: manufacturing a carbon steel bar into a metal support frame in a welding mode, wherein the metal support frame is in a square grid shape, and a space in the middle is a mounting hole;

manufacturing a net body frame: heating and melting the resin at the temperature of 95 ℃ to obtain a resin solution, adding 1.6 wt% of defoaming agent into the resin solution, and uniformly stirring to obtain a resin solution I; then, the resin solution I is heated to 210 ℃ and then extruded into a mould, and a net body frame can be obtained after cooling and solidification;

manufacturing a screen mesh: and (2) putting the net rack body into a mounting hole on a metal support frame, adding 9 wt% of microcrystalline cellulose into a resin solution II, uniformly stirring, then preserving the temperature of the resin solution II at 92 ℃ for 12 hours, adding an IPDA curing agent, uniformly stirring to obtain a mixed solution, uniformly filling a gap between the net rack body and the metal support frame with the mixed solution, standing at room temperature for 30 minutes, removing a mold, then curing at 105 ℃ for 12 hours, and forming an integrally-formed screen after forming.

The resin in this example is a mixture of polyurethane and polyoxymethylene, and the solid mass ratio of polyurethane to polyoxymethylene is 8.1: 1.

Example 4

The embodiment of the invention provides a manufacturing process of a screen, which comprises the following steps:

manufacturing a metal support frame: the medium carbon steel bar is made into a metal support frame in a welding mode, the metal support frame is in a square grid shape, and a space in the middle is a mounting hole;

manufacturing a net body frame: heating and melting resin at 85 ℃ to obtain a resin solution, adding 1.1 wt% of defoaming agent into the resin solution, and uniformly stirring to obtain a resin solution I; then, the resin solution I is heated to 215 ℃ and then extruded into a mould, and a net body frame can be obtained after cooling and solidification;

manufacturing a screen mesh: putting the net rack body into a mounting hole on a metal support frame, adding 8.5 wt% of microcrystalline cellulose into a resin solution II, uniformly stirring, then preserving the temperature of the resin solution II at 94 ℃ for 12 hours, adding a MOCA Moca curing agent, uniformly stirring to obtain a mixed solution, uniformly filling the gap between the net rack body and the metal support frame with the mixed solution, standing at room temperature for 30 minutes, removing a mold, then curing at 107 ℃ for 12 hours, and forming an integrally-formed screen after molding.

The resin in this example is a mixture of polyurethane and polyoxymethylene, and the solid mass ratio of polyurethane to polyoxymethylene is 7.8: 1.

Example 5

The embodiment of the invention provides a manufacturing process of a screen, which comprises the following steps:

manufacturing a metal support frame: manufacturing a copper alloy strip into a metal support frame in a welding mode, wherein the metal support frame is in a square grid shape, and a space in the middle is a mounting hole;

manufacturing a net body frame: heating and melting the resin at the temperature of 92 ℃ to obtain a resin solution, adding 1.4 wt% of defoaming agent into the resin solution, and uniformly stirring to obtain a resin solution I; then heating the resin solution I to 196 ℃, extruding the resin solution I into a mould, and cooling and solidifying to obtain a net body frame;

manufacturing a screen mesh: and (2) putting the net rack body into a mounting hole on a metal support frame, preserving the temperature of the resin solution II at 80-100 ℃ for 12 hours, adding a PACM curing agent, uniformly stirring to obtain a mixed solution, uniformly filling gaps between the net rack body and the metal support frame with the mixed solution, standing at room temperature for 30 minutes, removing a mold, curing at 108 ℃ for 11-12 hours, and forming an integrally-formed screen after molding.

The resin in this example is a mixture of polyurethane and polyoxymethylene, and the solid mass ratio of polyurethane to polyoxymethylene is 8.5: 1.

Example 6

The embodiment of the invention provides a manufacturing process of a screen, which comprises the following steps:

manufacturing a metal support frame: manufacturing a manganese steel bar into a metal support frame in a welding mode, wherein the metal support frame is in a square grid shape, and a space in the middle is a mounting hole;

manufacturing a net body frame: heating and melting the resin at the temperature of 80 ℃ to obtain a resin solution, adding 1.3 wt% of defoaming agent into the resin solution, and uniformly stirring to obtain a resin solution I; then, extruding the resin solution I into a mould, and cooling and solidifying to obtain a net body frame;

manufacturing a screen mesh: and (2) putting the net rack body into a mounting hole on a metal support frame, preserving the temperature of the resin solution II at 81 ℃ for 12 hours, adding a DMDC curing agent, uniformly stirring to obtain a mixed solution, uniformly filling the gap between the net rack body and the metal support frame with the mixed solution, demolding, curing at 102 ℃ for 12 hours, and forming the integrally-formed screen.

Example 7

The embodiment of the invention provides a manufacturing process of a screen, which comprises the following steps:

manufacturing a metal support frame: manufacturing a high-carbon steel bar into a metal support frame in a welding mode, wherein the metal support frame is in a square grid shape, and a space in the middle is a mounting hole;

manufacturing a net body frame: heating and melting the resin at the temperature of 98 ℃ to obtain a resin solution, adding 1.8 wt% of defoaming agent into the resin solution, and uniformly stirring to obtain a resin solution I; then, extruding the resin solution I into a mould, and cooling and solidifying to obtain a net body frame;

manufacturing a screen mesh: and (3) putting the net rack body into a mounting hole on a metal support frame, preserving the temperature of the resin solution II at 88 ℃ for 12 hours, adding a curing agent, uniformly stirring to obtain a mixed solution, uniformly filling the gap between the net rack body and the metal support frame with the mixed solution, removing the mold, curing and forming to form the integrally formed screen.

Example 8

The embodiment of the invention provides a manufacturing process of a screen, which comprises the following steps:

manufacturing a metal support frame: manufacturing a manganese steel bar into a metal support frame in a welding mode, wherein the metal support frame is in a square grid shape, and a space in the middle is a mounting hole;

manufacturing a net body frame: heating and melting the resin at the temperature of 91 ℃ to obtain a resin solution, adding 1.2 wt% of defoaming agent into the resin solution, and uniformly stirring to obtain a resin solution I; then, extruding the resin solution I into a mould, and cooling and solidifying to obtain a net body frame;

manufacturing a screen mesh: and (3) putting the net rack body into a mounting hole on a metal support frame, preserving the temperature of the resin solution II at 83 ℃ for 12 hours, adding a curing agent, uniformly stirring to obtain a mixed solution, uniformly filling the gap between the net rack body and the metal support frame with the mixed solution, removing the mold, curing and forming to form the integrally formed screen.

Effect example 1

The screens obtained in examples 1 to 8 were examined for the degree of opening, the service life, the corrosion resistance and the mineral recovery of the screen. The corrosion resistance of the screen is tested by referring to a soaking experiment of ASTM-D543, and the other tests are tested according to relevant standards, and the test results are shown in Table 1.

TABLE 1

As can be seen from the data in table 1, the screen obtained in the embodiment of the present invention has a larger number of openings, and a corresponding higher opening ratio, and not only has a good dewatering effect, but also can improve the recovery rate of mineral flotation. And the service life is longer, and after 30 days of soaking, the retention rate of the hardness is more than 94%, which shows that the corrosion resistance is better.

Effect example 2

The outer shells of the screens of examples 1 to 4 of the present invention were peeled off, and the degradation rates were measured according to the method of testing astm d5338, which is a standard for biodegradation test, and the test results are shown in table 2.

TABLE 2 test results of degradation rates

Sample product	Degradation Rate (%)
		Example 1	75
Example 2	85
		Example 3	82
Example 4	78

As can be seen from the data in the table 2, the addition of the microcrystalline cellulose improves the degradability of the screen shell, and the waste resin materials in the later period can be degraded and recycled, so that the environmental pollution is avoided, and the post treatment of the screen is convenient.

In conclusion, the screen mesh provided by the embodiment of the invention has the advantages that the manufacturing process is simple and easy to operate, the energy consumption is low, the problems in the working procedures can be corrected by a step-by-step processing mode, the product problems are reduced as much as possible, and the waste caused by one-step forming is avoided. On the other hand, the screen prepared by the manufacturing process of the screen has the advantages of acid and alkali resistance, corrosion resistance, high aperture ratio, good dehydration effect, long service life and the like.

The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.