High-density ultra-thin electronic-grade glass fiber cloth

Abstract

The application discloses a kind of high density ultra-thin electronic grade glass fiber cloth, it relates to glass fiber cloth preparation technical field, high density ultra-thin electronic grade glass fiber cloth is woven by warp yarn and weft yarn with 4.0 μm filament diameter, warp and weft density is 90-100 root / inch, plain weave is carried out using air-jet loom combined with auxiliary air jet mechanism, ensure that fiber arrangement is compact;Preparation method includes low-speed whole pulp, weaving, desizing, deep opening, and cleaning and surface treatment steps;When weaving, low tension control and low pressure airflow auxiliary are passed through, make fabric structure more compact uniform;Most of sizing is gradually eliminated using three-step method, sizing is further removed by liquefied desizing;Opening and cleaning use water flow and air flow combined mode, ensure that fiber is opened, and sizing residue rate is reduced to minimum;Finally, the strength of high density ultra-thin electronic grade glass fiber cloth is improved by silane coupling agent treatment;Realize the low tension and extremely low sizing residue rate weaving of high density ultra-thin electronic grade glass fiber cloth.

Description

Technical Field

[0001] This invention relates to the field of glass fiber cloth preparation technology, and in particular to a high-density ultrathin electronic-grade glass fiber cloth. Background Technology

[0002] With the rapid development of modern technology, electronic devices are facing increasingly higher requirements for performance and size, and the industrial sector is also growing its demand for lightweight, high-strength materials. High-density ultra-thin glass fiber cloth, due to its excellent physical properties and process adaptability, is gradually becoming an important material to meet these needs.

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

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

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

[0006] However, the weaving of high-density ultra-thin glass fiber cloth presents certain challenges. For example, the residual desizing rate of existing desizing technology can only be controlled at around 0.30%. For high-density ultra-thin glass fiber cloth, there is still a lot of residual sizing material, which increases the friction between the fabric 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 over-smoldering, which reduces 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 ensure uniform yarn tension. However, the existing weaving method using air-jet looms cannot meet the tension requirements for weaving high-density ultra-thin glass fiber cloth.

[0008] High-density ultra-thin glass fiber cloth, as a functional material that combines lightweight, high strength and excellent dielectric properties, is in increasing demand in the fields of electronics and information technology and industry. 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 this invention is to provide a high-density ultra-thin electronic-grade glass fiber cloth to solve the problem that existing desizing and weaving technologies cannot meet the requirements of extremely low desizing residue and uniform tension for manufacturing high-density ultra-thin glass fiber cloth.

[0010] The preferred technical solutions among the many technical solutions provided by this invention can produce a variety of technical effects, which are described in detail below.

[0011] To address the aforementioned technical problems, the present invention provides the following technical solution:

[0012] This invention provides a high-density, ultra-thin electronic-grade glass fiber cloth, comprising warp yarns: single filament fiber diameter 4.0 μm, selected from 1.3-2.0 tex electronic-grade glass fiber yarns; weft yarns: single filament fiber diameter 4.0 μm, selected from 1.3-2.0 tex electronic-grade glass fiber yarns; the warp and weft density process adopts 90-100 threads / inch; the cloth is woven in plain weave using an air-jet loom and an auxiliary air-jet mechanism;

[0013] S1: Low-speed sizing; The electronic-grade glass fiber yarn is sized so that the sizing agent is evenly applied to the yarn. The yarn is then wound onto the warp beam at low speed to sizing and improve the smoothness of the yarn surface.

[0014] S2: Weaving; The warp beam is installed on the air-jet loom, which uses clamping to hold the weft yarn and air jets to feed the weft yarn between the warp yarns. 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 the weaving process, 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 airflow from top to bottom at the plain weave interlacing point, so that the weft yarns are pushed closer to each other and arranged tightly under air pressure;

[0017] S3: Three-step desizing;

[0018] S3.1: Low-temperature pre-de-slurry firing; within 6-8 hours, the furnace temperature is raised from 150℃ to 300℃ to decompose 60-68% of the slurry and prevent thermal stress concentration during high-temperature de-slurry firing.

[0019] S3.2: High-temperature short-time desizing; temperature is 460-500℃, continuous desizing speed is 30-35m / min, and the residual rate of residual sizing after fabric exit is controlled at 0.22-0.28%;

[0020] S3.3: Medium-temperature long-time sizing desizing; the temperature is 400-450℃, and the sizing time is 30-50 hours, which decomposes the residual pulp and controls the residual rate to 0.03-0.06%, thus stabilizing the fiber structure;

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

[0022] S5: Liquefaction Desizing; Immerse the high-density ultra-thin electronic-grade glass fiber fabric of S4 in the desizing solution for 3-5 hours to liquefy and remove the residual sizing.

[0023] S6: Deep fiber opening and cleaning;

[0024] S6.1: The high-density ultra-thin electronic-grade glass fiber fabric is simultaneously split on both sides through the upper and lower nozzles of the water splitting device.

[0025] S6.2: Air jet nozzles are provided on both sides behind the upper and lower nozzles of the water-blowing device to blow away the slurry particles between the yarns on both sides of the high-density ultra-thin electronic-grade glass fiber fabric.

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

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

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

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

[0030] In one embodiment, 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 residue rate of the high-density ultrathin electronic-grade glass fiber prefabricated cloth is controlled to be less than 0.03%.

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

[0033] In one embodiment, in step S6.2, the airflow ejected from the airflow nozzle is a low-pressure airflow with a pressure of 0.5-0.8 MPa.

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

[0035] 1. High precision and stability: This invention uses electronic-grade glass fiber yarn with a single filament diameter of 4.0μm and weaves it with a warp and weft density of 90-100 threads / inch, which ensures the high density and ultra-thin characteristics of the glass fiber cloth, while providing excellent electrical properties, mechanical properties and structural stability.

[0036] 2. Precise tension control: During the weaving process, low tension control is adopted with warp tension of 13-17N and weft tension of 8-12N, and a tension difference of 5N is maintained. This effectively avoids fiber breakage and fabric deformation caused by uneven tension control during the weaving process, and makes the woven fabric have uniform tension, straight and non-curling, thus improving the quality of high-density ultra-thin electronic-grade glass fiber cloth products.

[0037] Furthermore, by using an auxiliary jetting mechanism, a low-pressure airflow is provided during the weft yarn arrangement process, which helps the yarns to align closer together, making the weft yarn arrangement more compact and the gaps smaller. This achieves control and improves the density uniformity and tensile strength of the fabric, and further reduces the tension difference between yarns, thus improving the tension uniformity between yarns.

[0038] 3. High-efficiency 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 sizing material. This achieves an ultra-low sizing material treatment rate in the smoldering process of high-density ultra-thin electronic-grade glass fiber cloth, while avoiding thermal stress concentration damage to the fiber structure. It also avoids the phenomenon of over-smoldering that is prone to occur in high-density ultra-thin electronic-grade glass fiber cloth under long-term smoldering desizing, thus improving product quality and yield.

[0039] 4. Deep fiber opening and cleaning treatment: The fiber opening and cleaning technology, which combines water flow from the upper and lower nozzles with high-pressure airflow from the side, ensures uniform fiber opening and removes slurry particles between fibers, controlling the slurry treatment rate to below 0.03%. This allows more silane coupling agent to remain between the fibers in the S7 surface treatment step, enabling more glass fibers in the fabric to come into contact with the silane coupling agent. It also reduces the surface area of ​​glass fibers that cannot come into contact with 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, this invention achieves 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 enabling the efficient production of high-density ultra-thin electronic-grade glass fiber cloth. Detailed Implementation

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

[0042] The specific implementation provides a high-density ultrathin electronic-grade glass fiber cloth, woven from warp and weft yarns with a single filament diameter of 4.0μm, using a warp and weft density of 90-100 yarns / inch. Plain weaving is achieved using an air-jet loom combined with an auxiliary air-jet mechanism to ensure tight fiber arrangement. 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 make the fabric structure more dense and uniform. The desizing process uses a three-step method to gradually remove most of the sizing, combined with liquefied desizing for further sizing removal. Fiber opening and cleaning use a combination of water and airflow to ensure fiber opening and minimize sizing residue. Finally, silane coupling agent treatment enhances the strength of the high-density ultrathin electronic-grade glass fiber cloth. This achieves low tension and extremely low sizing residue weaving of the high-density ultrathin electronic-grade glass fiber cloth, effectively solving the problem that existing desizing and weaving technologies cannot meet the requirements of extremely low desizing residue and uniform tension for manufacturing high-density ultrathin glass fiber cloth.

[0043] Furthermore, the entirety of the configurations illustrated in the following embodiments is not limited to those necessary for the solution of the invention as described in the claims.

[0044] Example 1: High-density ultra-thin electronic-grade glass fiber cloth consists of warp yarns: 4.0 μm monofilament fiber diameter, selected from 1.3-2.0 tex electronic-grade glass fiber yarns; weft yarns: 4.0 μm monofilament fiber diameter, selected from 1.3-2.0 tex electronic-grade glass fiber yarns; the warp and weft density is 90 yarns / inch; the cloth is woven in a plain weave using an air-jet loom and an auxiliary air-jet mechanism.

[0045] S1: Low-speed sizing; Sizing the electronic-grade glass fiber yarn to make the sizing agent evenly applied to the yarn, and then winding the yarn onto 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, which uses clamping to hold the weft yarn and air jets to feed the weft yarn between the warp yarns. 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 the weaving process, 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, the auxiliary jet mechanism is activated, and a low-pressure airflow of 0.2MPa is ejected from top to bottom at the plain weave interlacing point, so that the weft yarns are pushed closer to each other and arranged tightly under the air pressure.

[0049] S3: Three-step desizing;

[0050] S3.1: Low-temperature pre-de-slurry firing; the furnace temperature is raised from 150℃ to 300℃ in 6 hours, the slurry decomposition rate is 60%, and thermal stress concentration is prevented during high-temperature de-slurry firing.

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

[0052] S3.3: Medium-temperature long-time sizing desizing; the temperature is 400℃ and the sizing time is 35 hours, which decomposes the residual pulp with a residual rate of 0.06%, stabilizing the fiber structure;

[0053] S4: Cool the high-density ultra-thin electronic-grade glass fiber preform 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 remove the residual sizing.

[0055] S6 Deep Fiber Opening and Cleaning;

[0056] S6.1: The high-density ultra-thin electronic-grade glass fiber fabric is simultaneously split on both sides through the upper and lower nozzles of the water splitting device.

[0057] S6.2: Air jet nozzles are provided on both sides behind the upper and lower nozzles of the water-blowing device to spray out low-pressure airflow of 0.7MPa to blow away the slurry particles between the yarns on both sides of the high-density ultra-thin electronic-grade glass fiber fabric.

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

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

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

[0061] S1: Low-speed sizing; The electronic-grade glass fiber yarn is sized so that the sizing agent is evenly applied to the yarn. The yarn is then wound onto the warp beam at a low speed of 35-40m / min to sizing and improve the smoothness of the yarn surface.

[0062] S2: Weaving; The warp beam is installed on the air-jet loom, which uses clamping to hold the weft yarn and air jets to feed the weft yarn between the warp yarns. 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 the weaving process, 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, the auxiliary jet mechanism is activated, and a low-pressure airflow of 0.2MPa is ejected from top to bottom at the plain weave interlacing point, so that the weft yarns are pushed closer to each other and arranged tightly under the air pressure.

[0065] S3: Three-step desizing;

[0066] S3.1: Medium and low temperature pre-de-slurry firing; within 7 hours, the furnace temperature is raised from 150℃ to 300℃, the slurry decomposition rate is 63.5%, and thermal stress concentration is prevented during high temperature de-slurry firing.

[0067] S3.2: High-temperature short-time desizing; Temperature: 475℃, continuous desizing speed: 35m / min, residual sizing rate of fabric output: 0.26%;

[0068] S3.3: Medium-temperature long-time sizing desizing; the temperature is 420℃ and the sizing time is 33 hours, which decomposes the residual pulp with a residual rate of 0.05%, stabilizing the fiber structure;

[0069] S4: Cool the high-density ultra-thin electronic-grade glass fiber preform 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 remove the residual sizing.

[0071] S6: Deep fiber opening and cleaning;

[0072] S6.1: The high-density ultra-thin electronic-grade glass fiber fabric is simultaneously split on both sides through the upper and lower nozzles of the water splitting device.

[0073] S6.2: Air jet nozzles are provided on both sides behind the upper and lower nozzles of the water-blowing device to spray out low-pressure airflow of 0.7MPa to blow away the slurry particles between the yarns on both sides of the high-density ultra-thin electronic-grade glass fiber fabric.

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

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

[0076] Example 3: High-density ultrathin electronic-grade glass fiber cloth is woven from warp and weft yarns with a single filament diameter of 4.0 μm; wherein, the warp yarn has a single filament fiber diameter of 4.0 μm and is selected as 1.3-2.0 tex electronic-grade glass fiber yarn; the weft yarn has a single filament fiber diameter of 4.0 μm and is selected as 1.3-2.0 tex electronic-grade glass fiber yarn; the warp and weft density is 100 yarns / inch; the glass fiber cloth is woven in a plain weave using an air-jet loom and an auxiliary air-jet mechanism;

[0077] S1: Low-speed sizing; The electronic-grade glass fiber yarn is sized to make the sizing agent evenly applied to the yarn. The yarn is then wound onto the warp beam at a low speed of 40-45m / min to sizing and improve the smoothness of the yarn surface.

[0078] S2: Weaving; The warp beam is installed on the air-jet loom, which uses clamping to hold the weft yarn and air jets to feed the weft yarn between the warp yarns. 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 the weaving process, 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, the auxiliary jet mechanism is activated, and a low-pressure airflow of 0.2MPa is ejected from top to bottom at the plain weave interlacing point, so that the weft yarns are pushed closer to each other and arranged tightly under the air pressure.

[0081] S3: Three-step desizing;

[0082] S3.1: Low-temperature pre-de-slurry firing; within 8 hours, the furnace temperature is raised from 150℃ to 300℃, the slurry decomposition rate is 68%, and thermal stress concentration is prevented during high-temperature de-slurry firing.

[0083] S3.2: High-temperature short-time desizing; Temperature: 500℃, continuous desizing speed: 35m / min, residual sizing rate of fabric output: 0.21%;

[0084] S3.3: Medium-temperature long-time sizing desizing; the temperature is 450℃ and the sizing time is 31 hours, which decomposes the residual pulp with a residual rate of 0.04%, stabilizing the fiber structure;

[0085] S4: Cool the high-density ultra-thin electronic-grade glass fiber preform 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 remove the residual sizing.

[0087] S6: Deep fiber opening and cleaning;

[0088] S6.1: The high-density ultra-thin electronic-grade glass fiber fabric is simultaneously split on both sides through the upper and lower nozzles of the water splitting device.

[0089] S6.2: Air jet nozzles are provided on both sides behind the upper and lower nozzles of the water-blowing device to spray out low-pressure airflow of 0.7MPa to blow away the slurry particles between the yarns on both sides of the high-density ultra-thin electronic-grade glass fiber fabric.

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

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

[0092] The high-density ultrathin electronic-grade glass fiber cloths prepared in Examples 1-3 were subjected to strength tests, and the test data are shown in the table below:

[0093] Test Project Example 1 Example 2 Example 3 meridional strength 45.1N / 25mm 48.5N / 25mm 46.6N / 25mm latitudinal intensity 43.5N / 25mm 44.3N / 25mm 42.0N / 25mm

[0094] As can be seen from Examples 1-3 above, in the three-step desizing process of S3, the longer the heating time of the medium-low temperature pre-desizing is, the higher the slurry decomposition rate reaches 68%; in the high-temperature short-time desizing, the higher the temperature, the lower the slurry residue rate, reaching a minimum of 0.21%; however, the temperature and time of the pre-desizing need to be well controlled. The temperature cannot be too high, otherwise it will affect the forming strength of the fabric. The pre-desizing time controlled at high temperature cannot be too long, otherwise it will also affect the forming strength of the fabric; in step S3.3, the pre-desizing temperature is shortened by increasing the temperature to avoid the pre-desizing temperature being too high or too long. As can be seen from the above, the higher the pre-desizing temperature and the shorter the pre-desizing time, the lower the slurry residue rate, reaching a minimum of 0.04%.

[0095] With the combined effects of liquefaction desizing, deep fiber opening, and cleaning, the residual sizing rate in Example 1 decreased from 0.06% to 0.026%; in Example 2, it decreased from 0.05% to 0.020%; and in Example 3, it decreased from 0.04% to 0.020%. This demonstrates that soaking in the desizing solution liquefies and removes residual sizing or reduces its adhesion to the fiber surface. Combined with the deep fiber opening and cleaning steps, which open the fiber gaps and remove residual sizing particles, the residual sizing rate of the high-density ultrathin electronic-grade glass fiber cloth can only reach a maximum of 0.02%.

[0096] Based on the strength test data, it can be concluded that for high-density ultra-thin electronic-grade glass fiber cloth woven with yarn of the same diameter and a diameter of 4.0μm, the optimal sizing speed before manufacturing is maintained at 35-40m / min. This ensures the best control of sizing material encapsulation, the best protection of fibers during weaving, and the least fiber damage. Furthermore, the lower the sizing residue rate of the high-density ultra-thin electronic-grade glass fiber cloth, the higher the amount of silane coupling agent impregnated, resulting in better mechanical properties. However, the desizing temperature should not be too high, as excessively high temperatures will lead to a decrease in the strength of the fabric.

[0097] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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, The fabric consists of warp yarns with a single filament diameter of 4.0 μm, made of 1.3-2.0 tex electronic-grade glass fiber yarn; weft yarns with a single filament diameter of 4.0 μm, made of 1.3-2.0 tex electronic-grade glass fiber yarn; a warp and weft density of 90-100 threads / inch; and a plain weave fabric produced using an air-jet loom and auxiliary air-jet mechanism. The specific processing steps include: S1: low-speed sizing; sizing the electronic-grade glass fiber yarn, so that the sizing agent is evenly applied to the yarn, and the yarn is wound onto the warp beam at low speed for sizing, controlling the sizing speed at 30-50m / min to improve the smoothness of the yarn surface. S2: Weaving; The warp beam is installed on the air-jet loom, which uses clamping to hold the weft yarn and air jets to feed the weft yarn between the warp yarns. With the assistance of the auxiliary air jet mechanism, a high-density ultra-thin electronic-grade glass fiber fabric is woven. S2.1: During the weaving process, the warp tension is 13-17N, the weft tension is 8-12N, and the yarn tension difference is 5N; S2.2: The auxiliary jet mechanism is set at an inclined angle, and the jet direction of the auxiliary jet mechanism is set from top to bottom. Its low-pressure airflow acts directionally on the plain weave interlacing point under the set humidity conditions, so as to cause the weft yarns to move closer together under the air pressure and improve the fabric density and interlacing stability. S3: Three-step desizing; S3.1: Low-temperature pre-de-slurry firing; within 6-8 hours, the furnace temperature is raised from 150℃ to 300℃ to decompose 60-68% of the slurry and prevent thermal stress concentration during high-temperature de-slurry firing. S3.2: High-temperature short-time desizing; temperature is 460-500℃, continuous desizing speed is 30-50m / min, and the residual sizing rate of the fabric is controlled at 0.22-0.28%; S3.3: Medium-temperature long-term sizing and desizing; temperature 400-450℃, sizing time 30-50 hours, to decompose residual pulp and control the residual rate to 0.03-0.06%, stabilizing fiber structure; S4: Cool the high-density ultra-thin electronic-grade glass fiber preform to room temperature; S5: Liquefaction Desizing; Immerse the high-density ultra-thin electronic-grade glass fiber fabric of S4 in the desizing solution for 3-5 hours to liquefy and remove the residual sizing. S6: Deep fiber opening and cleaning; S6.1: The high-density ultra-thin electronic-grade glass fiber fabric is simultaneously split on both sides through the upper and lower nozzles of the water splitting device. S6.2: Air jet nozzles are provided on both sides behind the upper and lower nozzles of the water fiber opening device. The air jet nozzles spray low-pressure air at a pressure of 0.5-0.8MPa to help blow away the sizing particles attached to the yarn surface, thereby improving cleaning efficiency and fiber opening integrity. 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 prefabricated fabric dried in S6 is impregnated in silane coupling agent KH-550 and then dried to obtain high-density ultra-thin electronic-grade glass fiber fabric. Through the synergistic effect of the above steps, the residual slurry rate of the obtained high-density ultrathin electronic-grade glass fiber cloth is controlled to be less than 0.03%, and the thickness is controlled to be in the range of 15~25μm.