High-density ultrathin electronic-grade glass fiber cloth

Abstract

The invention discloses high-density ultra-thin electronic-grade glass fiber cloth, and relates to the technical field of glass fiber cloth preparation, the high-density ultra-thin electronic-grade glass fiber cloth is formed by weaving warp yarns and weft yarns with the monofilament diameter of 4.0 microns, the warp and weft density is 90-100 pieces / inch, an air jet loom is combined with an auxiliary air jet mechanism for plain weaving, and it is guaranteed that fibers are tightly arranged; the preparation method comprises the steps of low-speed warping, weaving, desizing, deep splitting, cleaning and surface treatment. During weaving, through low-tension control and low-pressure airflow assistance, the fabric structure is more compact and uniform; a three-step method is adopted to gradually eliminate most slurry, and the slurry is further removed through liquefaction desizing; splitting and cleaning adopt a water flow and air flow combined mode, so that fiber opening is ensured, and the slurry residue rate is reduced to the minimum; finally, the strength of the high-density ultrathin electronic-grade glass fiber cloth is improved through treatment of a silane coupling agent; and low-tension and extremely low-slurry-residue-rate weaving of the high-density ultrathin electronic-grade glass fiber cloth is realized.

Description

Technical Field

[0001] The invention relates to the technical field of glass fiber cloth preparation, in particular to a high-density ultra-thin electronic-grade glass fiber cloth. Background Art

[0002] With the rapid development of modern technology, the performance and volume requirements of electronic equipment are increasing, and the demand for lightweight and high-strength materials in the industrial field is also growing. High-density ultra-thin glass fiber cloth has gradually become an important material to meet these needs due to its excellent physical properties and process adaptability.

[0003] (1) High-density ultra-thin glass fiber cloth has the following functions in 5G electronic devices: As the substrate of printed circuit boards (PCBs): Its ultra-thin structure and high density provide stable mechanical support for PCBs, while effectively reducing the dielectric constant and dielectric loss, ensuring stable transmission of high-frequency signals.

[0004] (2) High-density ultra-thin glass fiber cloth as the base cloth of the reinforcement material has the following features: Lightweight: The ultra-thin design reduces the weight of the material, improving fuel economy and load efficiency. High strength: The high-density arrangement of the fiber bundles gives the composite material excellent tensile strength, impact resistance and fatigue resistance.

[0005] (3) Industrial filtration and protective materials: used for high-efficiency filtration materials, high-temperature protective cloths and corrosion-resistant coatings. Its compact fiber structure and excellent thermal stability enable it to maintain stable performance in extreme environments.

[0006] However, there are certain challenges in the weaving of high-density ultra-thin glass fiber cloth. For example, the desizing residual rate of the existing desizing technology can only be controlled at about 0.30%. For high-density ultra-thin glass fiber cloth, there is still a lot of residual sizing, which increases the friction between the cloth fibers and reduces the fiber strength. In addition, the existing high-temperature smoldering desizing technology, when applied to ultra-thin glass fiber cloth, is prone to smoldering through, reducing the strength of the glass fiber cloth.

[0007] The tension difference between the fiber yarns also needs to be controlled at a very low level to make the tension of the yarns uniform. However, the existing weaving method using a jet loom cannot meet the tension requirements for weaving high-density ultra-thin glass fiber cloth.

[0008] As a functional material with lightweight, high strength and excellent dielectric properties, high-density ultra-thin glass fiber cloth is increasingly needed in the electronic information and industrial fields. Therefore, there is an urgent need to weave a high-density ultra-thin glass fiber cloth to meet the needs of high-density ultra-thin glass fiber cloth in electronics, aerospace materials and industrial filtration or protective consumables. Summary of the invention

[0009] The purpose of the present invention is to provide a high-density ultra-thin electronic-grade glass fiber cloth to solve the problem that the existing desizing and weaving technology cannot meet the extremely low desizing residual rate and uniform tension required for manufacturing high-density ultra-thin glass fiber cloth.

[0010] The various technical effects that can be produced by the preferred technical solutions among the various technical solutions provided by the present invention are described in detail below.

[0011] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0012] The invention provides a high-density ultra-thin electronic-grade glass fiber cloth, comprising warp yarn: a single-filament fiber diameter of 4.0 μm, and electronic-grade glass fiber yarn of 1.3-2.0 tex is selected; weft yarn: a single-filament fiber diameter of 4.0 μm, and electronic-grade glass fiber yarn of 1.3-2.0 tex is selected; warp and weft density process adopts 90-100 strands / inch; an air jet loom and an auxiliary air jet mechanism are used to weave the cloth in plain weave;

[0013] S1: Sizing at low speed: Sizing the electronic grade glass fiber yarn, evenly smearing the sizing agent on the yarn, winding the yarn on the warp beam at low speed to improve the smoothness of the yarn surface;

[0014] S2: Weaving: The warp beam is installed on the air jet loom, and the weft yarn is clamped and sent between the warp yarns by air jet. With the assistance of the auxiliary air jet mechanism, a high-density ultra-thin electronic-grade glass fiber fabric is woven;

[0015] S2.1: During weaving, the warp tension is 13-17N, the weft tension is 8-12N, and the yarn tension difference is 5N;

[0016] S2.2: When feeding the weft yarn, start the auxiliary jet mechanism to spray low-pressure air from top to bottom at the plain weave interlacing point, so that the weft yarns are pushed by the air pressure to be close to each other and arranged closely;

[0017] S3: three-step desizing;

[0018] S3.1: Pre-desizing by medium-low temperature smoldering; within 6-8 hours, the furnace temperature is raised from 150°C to 300°C to decompose 60-68% of the slurry and prevent thermal stress concentration during high-temperature desizing;

[0019] S3.2: high temperature short time desizing; the temperature is 460-500℃, the continuous desizing speed is 30-35m / min, and the residual rate of residual slurry after the cloth is discharged is controlled to be 0.22-0.28%;

[0020] S3.3: Desizing by long-term smoldering at medium temperature; the temperature is 400-450℃, the smoldering time is 30-50 hours, the residual slurry is decomposed, and the residual rate is controlled to 0.03-0.06%, stabilizing the fiber structure;

[0021] S4: Cooling the high-density ultra-thin electronic-grade glass fiber fabric to room temperature;

[0022] S5: liquefaction desizing: immerse the high-density ultra-thin electronic-grade glass fiber fabric of S4 in the desizing liquid for 3-5 hours to liquefy and separate the residual slurry;

[0023] S6: Deep fiber opening and cleaning;

[0024] S6.1: The front and back sides of the high-density ultra-thin electronic-grade glass fiber fabric are opened simultaneously through the upper and lower nozzles of the water fiber opening device;

[0025] S6.2: Air jet nozzles are arranged on both sides of the rear of the upper and lower nozzles of the water fiber opening device to simultaneously blow away the slurry particles between the yarns on the front and back sides of the high-density ultra-thin electronic-grade glass fiber grey cloth;

[0026] S6.3: Dry at 200-230℃ for 20-30 seconds to avoid deformation of fabric fibers;

[0027] S7: surface treatment and finished cloth; the high-density ultra-thin electronic-grade glass fiber cloth dried in S6 is impregnated in a silane coupling agent; and dried to obtain a high-density ultra-thin electronic-grade glass fiber cloth.

[0028] In one embodiment, in step S1, the slurry speed is controlled at 30-50 m / min.

[0029] In one embodiment, in step S2, the woven high-density ultra-thin electronic-grade glass fiber fabric has a thickness of 15-25 μm.

[0030] In one of the embodiments, in step S2.2, a low-pressure airflow with a humidity of 65%-70% and an airflow pressure of 0.1-0.3 MPa is applied to bring the yarns closer together and reduce friction between the yarns.

[0031] In one embodiment, in step S6, the slurry residual rate of the high-density ultra-thin electronic-grade glass fiber blank is controlled to be less than 0.03%.

[0032] In one embodiment, in step S7, the silane coupling agent is KH-550.

[0033] In one embodiment, in step S6.2, the air flow pressure ejected by the air flow ejection nozzle is a low-pressure air flow of 0.5-0.8 MPa.

[0034] The beneficial effects of the present invention are as follows:

[0035] 1. High precision and stability: The present invention uses electronic-grade glass fiber yarn with a monofilament diameter of 4.0 μm and weaves it with a warp and weft density of 90-100 strands / inch, thereby ensuring the high density and ultra-thin characteristics of the glass fiber cloth, while providing excellent electrical properties, mechanical properties and structural stability.

[0036] 2. Accurate tension control: During the weaving process, low tension control of warp tension 13-17N and weft tension 8-12N is adopted, and the tension difference is maintained at 5N, which effectively avoids the phenomenon of fiber breakage and fabric deformation caused by uneven tension control during the weaving process, and makes the woven cloth surface tension uniform, the fabric is straight and not curled, and improves the quality of high-density ultra-thin electronic-grade glass fiber cloth products.

[0037] And through the auxiliary jet mechanism, low-pressure airflow is provided during the weft arrangement process, which assists the yarn arrangement to be closer, making the weft arrangement more compact and the gap smaller, thereby controlling and improving the density uniformity and tensile strength of the fabric, and further reducing the tension difference between the yarns and improving the tension uniformity between the yarns.

[0038] 3. Efficient desizing process: A three-step desizing method is adopted, including medium-low temperature smoldering, high temperature short-time desizing and medium temperature long-time smoldering desizing, combined with liquefaction desizing treatment, which can completely remove the slurry and achieve an ultra-low slurry treatment rate in the smoldering process of high-density ultra-thin electronic-grade glass fiber cloth. At the same time, it avoids the damage of the fiber structure by concentrated thermal stress, and can also avoid the phenomenon of over-smoldering of high-density ultra-thin electronic-grade glass fiber cloth under long-time smoldering desizing, thereby improving product quality and yield rate.

[0039] 4. Deep fiber opening and cleaning treatment: The fiber opening and cleaning technology combines the water flow of the upper and lower nozzles with the high-pressure air flow on the side to ensure uniform fiber opening and remove the slurry particles between the fibers, and control the slurry treatment rate below 0.03%. In the S7 surface treatment step, more silane coupling agent is retained in the fiber gaps in the high-density ultra-thin electronic-grade glass fiber cloth, so that more glass fibers in the cloth are exposed to the silane coupling agent, reducing the surface area of ​​the glass fibers that cannot contact the silane coupling agent due to residual slurry, thereby improving the mechanical properties of the finished high-density ultra-thin electronic-grade glass fiber cloth.

[0040] In summary, the present invention realizes low-tension weaving, low-residue desizing and deep fiber opening in the weaving, desizing and fiber opening technologies of high-density ultra-thin glass fiber cloth, thereby realizing the efficient production of high-density ultra-thin electronic-grade glass fiber cloth. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention.

[0042] A specific embodiment provides a high-density ultra-thin electronic-grade glass fiber cloth, which is woven from warp yarns and weft yarns with a single filament diameter of 4.0 μm, woven with a warp and weft density of 90-100 strands / inch, and plain woven using a jet loom combined with an auxiliary jet mechanism to ensure that the fibers are closely arranged; the preparation method includes low-speed sizing, weaving, desizing, deep fiber opening and cleaning and surface treatment steps; during weaving, low tension control and low-pressure airflow assistance are used to make the fabric structure more dense and uniform; the desizing process adopts a three-step method to gradually eliminate most of the sizing, and combines liquefaction desizing to further remove the sizing; fiber opening and cleaning adopt a combination of water flow and air flow to ensure fiber opening and minimize the sizing residue rate; finally, the strength of the high-density ultra-thin electronic-grade glass fiber cloth is improved by silane coupling agent treatment; low tension and extremely low sizing residue rate weaving of high-density ultra-thin electronic-grade glass fiber cloth is achieved; the problem that the existing desizing and weaving technology cannot meet the extremely low desizing residue rate and uniform tension required for manufacturing high-density ultra-thin glass fiber cloth is effectively solved.

[0043] In addition, all the contents of the configurations shown in the following embodiments are not necessarily limited to the solutions of the invention described in the claims.

[0044] Embodiment 1: High-density ultra-thin electronic-grade glass fiber cloth comprises warp yarn: single-filament fiber diameter 4.0 μm, electronic-grade glass fiber yarn of 1.3-2.0 tex is selected; weft yarn: single-filament fiber diameter 4.0 μm, electronic-grade glass fiber yarn of 1.3-2.0 tex is selected; warp and weft density process adopts 90 strands / inch; air jet loom and auxiliary air jet mechanism are used to weave the cloth in plain weave;

[0045] S1: Sizing at low speed: Sizing the electronic grade glass fiber yarn, evenly smearing the sizing agent on the yarn, winding the yarn on the warp beam at a low speed of 30-35m / min to improve the smoothness of the yarn surface;

[0046] S2: Weaving: The warp beam is installed on the air jet loom, and the weft yarn is clamped and fed between the warp yarns by air jet. With the assistance of the auxiliary air jet mechanism, a high-density ultra-thin electronic-grade glass fiber fabric with a thickness of 17μm is woven;

[0047] S2.1: During weaving, the warp tension is 15N, the weft tension is 10N, and the yarn tension difference is 5N;

[0048] S2.2: When feeding the weft yarn, start the auxiliary jet mechanism to spray a low-pressure airflow of 0.2MPa from top to bottom at the plain weave interlacing point, so that the weft yarns are pushed by the air pressure to be close to each other and arranged closely;

[0049] S3: three-step desizing;

[0050] S3.1: Pre-desizing by medium-low temperature smoldering; within 6 hours, the furnace temperature is raised from 150°C to 300°C, the slurry decomposition rate is 60%, and thermal stress concentration is prevented during high-temperature desizing;

[0051] S3.2: high temperature short time desizing; the temperature is 460℃, the continuous desizing speed is 35m / min, and the residual rate of residual sizing after the cloth is discharged is 0.28%;

[0052] S3.3: Desizing by long-term smoldering at medium temperature; the temperature is 400°C, the smoldering time is 35 hours, the residual slurry is decomposed, the residual rate is 0.06%, and the fiber structure is stabilized;

[0053] S4: Cooling the high-density ultra-thin electronic-grade glass fiber fabric to room temperature;

[0054] S5: liquefaction desizing; immerse the high-density ultra-thin electronic-grade glass fiber fabric of S4 in the desizing solution for 5 hours to liquefy and separate the residual slurry;

[0055] S6 deep fiber opening and cleaning;

[0056] S6.1: The front and back sides of the high-density ultra-thin electronic-grade glass fiber fabric are opened simultaneously through the upper and lower nozzles of the water fiber opening device;

[0057] S6.2: Air jet nozzles are arranged on both sides of the rear of the upper and lower nozzles of the water fiber opening device, which spray a low-pressure airflow of 0.7 MPa to simultaneously blow away the slurry particles between the yarns on the front and back sides of the high-density ultra-thin electronic-grade glass fiber grey cloth;

[0058] S6.3: Dry at 220℃ for 20 seconds to avoid deformation of fabric fibers; after drying, the slurry residue rate of high-density ultra-thin electronic-grade glass fiber fabric is 0.026%;

[0059] S7: surface treatment and finished cloth; the high-density ultra-thin electronic-grade glass fiber cloth dried in S6 is impregnated in silane coupling agent KH-550; and dried to obtain high-density ultra-thin electronic-grade glass fiber cloth.

[0060] Embodiment 2: High-density ultra-thin electronic-grade glass fiber cloth is woven from warp yarn and weft yarn with a monofilament diameter of 4.0 μm; wherein, the warp yarn: the monofilament fiber diameter is 4.0 μm, and the electronic-grade glass fiber yarn of 1.3-2.0 tex is selected; the weft yarn: the monofilament fiber diameter is 4.0 μm, and the electronic-grade glass fiber yarn of 1.3-2.0 tex is selected; the warp and weft density process adopts 95 strands / inch; the glass fiber cloth is woven in plain weave by using an air jet loom and an auxiliary air jet mechanism;

[0061] S1: Sizing at low speed: Sizing the electronic grade glass fiber yarn, evenly smearing the sizing agent on the yarn, winding the yarn on the warp beam at a low speed of 35-40m / min to improve the smoothness of the yarn surface;

[0062] S2: Weaving: The warp beam is installed on the air jet loom, and the weft yarn is clamped and fed between the warp yarns by air jet. With the assistance of the auxiliary air jet mechanism, a high-density ultra-thin electronic-grade glass fiber fabric with a thickness of 21μm is woven;

[0063] S2.1: During weaving, the warp tension is 15N, the weft tension is 10N, and the yarn tension difference is 5N;

[0064] S2.2: When feeding the weft yarn, start the auxiliary jet mechanism to spray a low-pressure airflow of 0.2MPa from top to bottom at the plain weave interlacing point, so that the weft yarns are pushed by the air pressure to be close to each other and arranged closely;

[0065] S3: three-step desizing;

[0066] S3.1: Pre-desizing by smoldering at medium and low temperatures; within 7 hours, the furnace temperature is raised from 150°C to 300°C, the slurry decomposition rate is 63.5%, and thermal stress concentration is prevented during high-temperature desizing;

[0067] S3.2: high temperature short time desizing; temperature: 475℃, continuous desizing speed: 35m / min, residual pulp rate after cloth discharge: 0.26%;

[0068] S3.3: Desizing by long-term smoldering at medium temperature; the temperature is 420℃, the smoldering time is 33 hours, the residual slurry is decomposed, the residual rate is 0.05%, and the fiber structure is stabilized;

[0069] S4: Cooling the high-density ultra-thin electronic-grade glass fiber fabric to room temperature;

[0070] S5: liquefaction desizing; immerse the high-density ultra-thin electronic-grade glass fiber fabric of S4 in the desizing solution for 5 hours to liquefy and separate the residual slurry;

[0071] S6: Deep fiber opening and cleaning;

[0072] S6.1: The front and back sides of the high-density ultra-thin electronic-grade glass fiber fabric are opened simultaneously through the upper and lower nozzles of the water fiber opening device;

[0073] S6.2: Air jet nozzles are arranged on both sides of the rear of the upper and lower nozzles of the water fiber opening device, which spray a low-pressure airflow of 0.7 MPa to simultaneously blow away the slurry particles between the yarns on the front and back sides of the high-density ultra-thin electronic-grade glass fiber grey cloth;

[0074] S6.3: Dry at 220℃ for 25 seconds to avoid deformation of fabric fibers; after drying, the slurry residue rate of high-density ultra-thin electronic-grade glass fiber fabric is 0.02%;

[0075] S7: surface treatment and finished cloth; the high-density ultra-thin electronic-grade glass fiber cloth dried in S6 is impregnated in silane coupling agent KH-550; and dried to obtain high-density ultra-thin electronic-grade glass fiber cloth.

[0076] Embodiment 3: High-density ultra-thin electronic-grade glass fiber cloth is woven from warp yarn and weft yarn with a monofilament diameter of 4.0 μm; wherein, the warp yarn: the monofilament fiber diameter is 4.0 μm, and the electronic-grade glass fiber yarn of 1.3-2.0 tex is selected; the weft yarn: the monofilament fiber diameter is 4.0 μm, and the electronic-grade glass fiber yarn of 1.3-2.0 tex is selected; the warp and weft density process adopts 100 strands / inch; the glass fiber cloth is woven in plain weave by using an air jet loom and an auxiliary air jet mechanism;

[0077] S1: Sizing at low speed: Sizing the electronic grade glass fiber yarn, evenly smearing the sizing agent on the yarn, winding the yarn on the warp beam at a low speed of 40-45m / min to improve the smoothness of the yarn surface;

[0078] S2: Weaving: The warp beam is installed on the air jet loom, and the weft yarn is clamped and fed between the warp yarns by air jet. With the assistance of the auxiliary air jet mechanism, a high-density ultra-thin electronic-grade glass fiber fabric with a thickness of 24μm is woven;

[0079] S2.1: During weaving, the warp tension is 15N, the weft tension is 10N, and the yarn tension difference is 5N;

[0080] S2.2: When feeding the weft yarn, start the auxiliary jet mechanism to spray a low-pressure airflow of 0.2MPa from top to bottom at the plain weave interlacing point, so that the weft yarns are pushed by the air pressure to be close to each other and arranged closely;

[0081] S3: three-step desizing;

[0082] S3.1: Pre-desizing by medium-low temperature smoldering; within 8 hours, the furnace temperature is raised from 150°C to 300°C, the slurry decomposition rate is 68%, and thermal stress concentration is prevented during high-temperature desizing;

[0083] S3.2: high temperature short time desizing; temperature: 500℃, continuous desizing speed: 35m / min, residual rate of residual sizing after cloth discharge is 0.21%;

[0084] S3.3: Desizing by long-term smoldering at medium temperature; the temperature is 450°C, the smoldering time is 31 hours, the residual slurry is decomposed, the residual rate is 0.04%, and the fiber structure is stabilized;

[0085] S4: Cooling the high-density ultra-thin electronic-grade glass fiber fabric to room temperature;

[0086] S5: liquefaction desizing; immerse the high-density ultra-thin electronic-grade glass fiber fabric of S4 in the desizing solution for 5 hours to liquefy and separate the residual slurry;

[0087] S6: Deep fiber opening and cleaning;

[0088] S6.1: The front and back sides of the high-density ultra-thin electronic-grade glass fiber fabric are opened simultaneously through the upper and lower nozzles of the water fiber opening device;

[0089] S6.2: Air jet nozzles are arranged on both sides of the rear of the upper and lower nozzles of the water fiber opening device, which spray a low-pressure airflow of 0.7 MPa to simultaneously blow away the slurry particles between the yarns on the front and back sides of the high-density ultra-thin electronic-grade glass fiber grey cloth;

[0090] S6.3: Dry at 220℃ for 30 seconds to avoid deformation of fabric fibers; after drying, the slurry residue rate of high-density ultra-thin electronic-grade glass fiber fabric is 0.02%;

[0091] S7: surface treatment and finished cloth; the high-density ultra-thin electronic-grade glass fiber cloth dried in S6 is impregnated in silane coupling agent KH-550; and dried to obtain high-density ultra-thin electronic-grade glass fiber cloth.

[0092] The high-density ultra-thin electronic-grade glass fiber cloth prepared in Examples 1-3 was subjected to strength tests, and the test data are shown in the following table:

[0093] Test items Example 1 Example 2 Example 3 Warp strength 45.1N / 25mm 48.5N / 25mm 46.6N / 25mm Weft strength 43.5N / 25mm 44.3N / 25mm 42.0N / 25mm

[0094] From the above examples 1-3, it can be seen that in the three-step desizing of S3, the longer the heating time of the medium-low temperature smoldering pre-desizing is, the higher the slurry decomposition rate is and reaches 68%; the higher the temperature is in the high-temperature short-time desizing, the lower the slurry residue rate is, reaching a minimum of 0.21%; but the smoldering desizing needs to control the temperature and time well, the temperature cannot be too high otherwise it will affect the forming strength of the fabric, and the smoldering time controlled at high temperature cannot be too long otherwise it will also affect the forming strength of the fabric; in the step S3.3, the smoldering temperature is prevented from being too high or too long by shortening the smoldering time as the temperature increases. It can be seen from the above that the higher the smoldering temperature and the shorter the smoldering time, the lower the slurry residue rate is, reaching a minimum of 0.04%.

[0095] Under the cooperation of liquefied desizing, deep fiber opening and cleaning, the slurry residue rate of Example 1 decreased from 0.06% to 0.026%; the slurry residue rate of Example 2 decreased from 0.05% to 0.020%; the slurry residue rate of Example 3 decreased from 0.04% to 0.020%. It can be concluded that the immersion in the desizing liquid causes the residual slurry to liquefy and separate or reduce the degree of bonding with the fiber surface. Under the cooperation of the deep fiber opening and cleaning steps, the fiber gaps are opened and the residual slurry particles are removed, and the slurry residue rate of the high-density ultra-thin electronic-grade glass fiber cloth can only reach 0.02% at most.

[0096] Combined with the data from the strength test, it can be concluded that for high-density ultra-thin electronic-grade glass fiber cloth woven with the same diameter of yarn and 4.0μm diameter, the sizing speed before manufacturing is maintained at 35-40m / min, the slurry wrapping is best controlled, the fiber is best protected during the weaving process, the fiber damage is minimal, and the lower the slurry residue rate of the high-density ultra-thin electronic-grade glass fiber cloth, the higher the silane coupling agent immersed, and the better the mechanical properties; but the desizing temperature cannot be too high, as too high a temperature will lead to a decrease in the strength of the cloth.

[0097] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described.

Claims

1. A high-density ultra-thin electronic grade glass fiber cloth, characterized in that: Including warp yarn: single filament fiber diameter 4.0μm, 1.3-2.0tex electronic grade glass fiber yarn; Weft yarn: single fiber diameter 4.0μm, 1.3-2.0tex electronic grade glass fiber yarn; The warp and weft density process uses 90-100 threads / inch; Adopt air jet loom and auxiliary air jet mechanism to weave cloth in plain weave; S1: Sizing at low speed: Sizing the electronic grade glass fiber yarn, evenly smearing the sizing agent on the yarn, winding the yarn on the warp beam at low speed to improve the smoothness of the yarn surface; S2: weaving; The warp beam is installed on the air jet loom, which clamps the weft yarn and feeds it between the warp yarns through air jet. With the assistance of the auxiliary air jet mechanism, a high-density ultra-thin electronic-grade glass fiber fabric is woven. S2.1: During weaving, the warp tension is 13-17N, the weft tension is 8-12N, and the yarn tension difference is 5N; S2.2: When feeding the weft yarn, start the auxiliary jet mechanism to spray low-pressure air from top to bottom at the plain weave interlacing point, so that the weft yarns are pushed by the air pressure to be close to each other and arranged closely; S3: three-step desizing; S3.1: Pre-desizing by medium-low temperature smoldering; within 6-8 hours, the furnace temperature is raised from 150°C to 300°C to decompose 60-68% of the slurry and prevent thermal stress concentration during high-temperature desizing; S3.2: high temperature short time desizing; the temperature is 460-500℃, the continuous desizing speed is 30-50m / min, and the residual rate of residual slurry after the cloth is discharged is controlled to be 0.22-0.28%; S3.3: Desizing by long-term smoldering at medium temperature; the temperature is 400-450℃, the smoldering time is 30-50 hours, the residual slurry is decomposed, and the residual rate is controlled to 0.03-0.06%, stabilizing the fiber structure; S4: Cooling the high-density ultra-thin electronic-grade glass fiber fabric to room temperature; S5: liquefaction desizing: immerse the high-density ultra-thin electronic-grade glass fiber fabric of S4 in the desizing liquid for 3-5 hours to liquefy and separate the residual slurry; S6: Deep fiber opening and cleaning; S6.1: The front and back sides of the high-density ultra-thin electronic-grade glass fiber fabric are opened simultaneously through the upper and lower nozzles of the water fiber opening device; S6.2: Air jet nozzles are arranged on both sides of the rear of the upper and lower nozzles of the water fiber opening device to simultaneously blow away the slurry particles between the yarns on the front and back sides of the high-density ultra-thin electronic-grade glass fiber grey cloth; S6.3: Dry at 200-230℃ for 20-30 seconds to avoid deformation of fabric fibers; S7: Surface treatment and finished fabric; The high-density ultra-thin electronic-grade glass fiber fabric dried by S6 is impregnated in a silane coupling agent; After drying, high-density ultra-thin electronic-grade glass fiber cloth is obtained.

2. The high-density ultra-thin electronic-grade glass fiber cloth according to claim 1, characterized in that: In step S1, the slurry speed is controlled at 30-50 m / min.

3. The high-density ultra-thin electronic-grade glass fiber cloth according to claim 1, characterized in that: In step S2, the woven high-density ultra-thin electronic-grade glass fiber blank cloth has a thickness of 15-25 μm.

4. The high-density ultra-thin electronic-grade glass fiber cloth according to claim 1, characterized in that: In step S2.2, a low-pressure airflow with a humidity of 65%-70% and an airflow pressure of 0.1-0.3 MPa is applied to bring the yarns closer together and reduce friction between the yarns.

5. The high-density ultra-thin electronic-grade glass fiber cloth according to claim 1, characterized in that: In step S6, the slurry residual rate of the high-density ultra-thin electronic-grade glass fiber blank is controlled to be less than 0.03%.

6. The high-density ultra-thin electronic-grade glass fiber cloth according to claim 1, characterized in that: In step S7, the silane coupling agent is KH-550.

7. The high-density ultra-thin electronic-grade glass fiber cloth according to claim 1, characterized in that: In step S6.2, the airflow pressure ejected from the airflow ejection nozzle is a low-pressure airflow of 0.5-0.8 MPa.