Organic fiber air plasma surface treatment device and method for adhesive film rolling process prepreg machine

Abstract

The invention provides an organic fiber air plasma surface treatment device and method for an adhesive film rolling process prepreg machine. The organic fiber air plasma surface treatment device comprises a low-temperature plasma power supply, a voltage regulator, a digital oscilloscope, a low-temperature plasma discharge device and a connecting and supporting truss. The low-temperature plasma power supply can display current and voltage conditions of the power supply host in real time; the voltage regulator can regulate the output voltage through the knob; the digital oscilloscope can detect the output waveform condition of the low-temperature plasma power supply in real time; the low-temperature plasma discharging device comprises a supporting device, an adjusting rod, a medium fixing device and an emitting device, and plasma discharging can be achieved at the normal temperature and the normal pressure. And the low-temperature plasma discharge device can be supported at a proper height by the connecting and supporting truss and is combined with the adhesive film rolling process prepreg machine. The organic fibers can be subjected to surface modification in the prepreg production process, and the purposes of improving the interface performance of the organic fibers and the resin and improving the bonding strength of the resin and the organic fibers are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of fiber prepreg production, and specifically to an air plasma surface treatment device and a corresponding treatment method for improving the interface performance between resin and fiber in the prepreg during the process of producing prepreg by film calendering method. Background Art

[0002] Composite materials prepared from organic fiber prepregs such as polyimide fiber, aramid fiber and ultra-high molecular weight polyethylene fiber have many advantages such as light weight, high strength and excellent impact resistance. Their application scope is gradually expanding in special protection, aerospace and other industries, and their development prospects are very broad. As one of the most commonly used methods for preparing fiber prepregs by hot melt method, the film calendering method has the advantages of high control precision of prepreg surface density and resin content, low volatile content, good quality and appearance of finished products, and applicability to a variety of high-performance fiber and resin combinations. It has been widely used in the industrial production of prepregs. The surface of organic fibers is smooth and inert. In the preparation of prepregs and composite materials, poor resin and fiber impregnation is prone to occur. The interface bonding performance of the cured composite material is weak, and fiber debonding is prone to occur, which affects the performance of the composite material and the performance of the fiber.

[0003] Normal pressure low temperature plasma technology can ionize electrons in the gas environment, thereby exciting the reaction gas to produce active particles, and perform repetitive chain breaking reactions, causing hydrogen ablation and extraction, causing changes in the microstructure and roughness of the organic fiber surface, thereby changing the surface properties of the organic fiber. Because it has many advantages such as no need for closed vacuum equipment and temperature control equipment, can adapt to a variety of organic fibers, and has little effect on the performance of the fiber body, it has been widely used. Patents CN104387769B, CN118599314A, etc. use plasma surface treatment of organic fibers to enhance their surface activity, increase the bonding strength between fibers and resins, and achieve good results. However, the method for surface treatment of such organic fibers is usually a simple fiber treatment and cannot be applied to the prepreg production line. There are problems such as low processing efficiency, easy contamination of treated organic fibers, and easy inactivation of fibers after surface treatment, which has certain limitations. Summary of the invention

[0004] In view of the above problems existing in the prior art, the present invention provides an organic fiber air plasma surface treatment device and method that can be used in a prepreg machine using a film calendering method, which solves the problems of poor wettability and low bonding strength between the resin and the organic fiber after curing faced by the current organic fiber prepreg in the production process. In addition, the device can be combined with the production process of prepreg using the film calendering method to realize batch preparation of organic fiber prepreg. The problems raised in the above background technology are solved.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: providing an organic fiber air plasma treatment device and method for a film calendering prepreg machine, wherein the air plasma surface treatment device can be combined with the film calendering prepreg machine, and by adding a plasma treatment process in the traditional film calendering production process, the surface modification of fiber bundles and fabrics can be achieved during the prepreg production process, thereby achieving the purpose of improving the interface performance between the fiber and the resin and enhancing the bonding strength between the resin and the fiber.

[0006] The organic fiber air plasma surface treatment device used in the film calendering prepreg machine can perform a modification reaction on the organic fiber passing through the low-temperature plasma discharge device at normal temperature and pressure, thereby activating the surface of the organic fiber, enhancing the surface activity of the organic fiber, improving the wettability of the organic fiber with the resin in the pressing process and the interface bonding performance of the composite material after curing.

[0007] The organic fiber air plasma surface treatment device for the film calendering prepreg machine comprises five parts: a low-temperature plasma power supply, a voltage regulator, a digital oscilloscope, a low-temperature plasma discharge device, and a connecting support truss. The low-temperature plasma power supply is the main switch of the entire air plasma surface treatment device, including a current display and a voltage display, which can display the current and voltage stability in real time when the air plasma surface treatment device is working.

[0008] The voltage regulator comprises an ohmmeter and a voltage regulating knob, and the output voltage of the plasma experiment power supply can be adjusted by rotating the voltage regulating knob.

[0009] The digital oscilloscope can be connected to a low-temperature plasma power supply via a probe, and can detect parameter information such as the frequency, peak value, minimum value, etc. of the output waveform in real time.

[0010] The low-temperature plasma discharge device includes four parts: a support device, an adjustment rod, a medium fixing device and an emission device. The support device is divided into two parts: an upper support panel and a lower support base. The upper support panel and the lower support base are connected and fixed by two adjustment rods, providing a fixed support function and a spacing adjustment function for the medium fixing device and the emission device. The medium fixing device is fixed to the upper support panel by a nut, providing a support and storage function for the upper medium sheet, and the height can be adjusted by a knob. The emission device is composed of a multi-layer electrode sheet and an electrode column. The electrode sheet can be removed and fixed to the upper support panel and the lower base by the electrode column for emitting plasma.

[0011] The connecting support truss can provide support for the plasma discharge device and can connect the yarn spreading device and the pressing device, so that the present invention is combined with the film calendering prepreg machine.

[0012] When producing prepreg, the low-temperature plasma discharge device is used after the yarn spreading process and the glue coating process and before the pressing process. The low-temperature plasma discharge device is fixed in the post-plasma treatment process of the yarn spreading device and the glue coating device in the prepreg production system by connecting the support truss, and performs plasma surface treatment on the organic fiber fabric passing through the air plasma surface treatment device to achieve the purpose of improving the interface performance of the organic fiber.

[0013] Preferably, the low-temperature plasma power supply may be provided with an output waveform qualitative detection indicator light for qualitatively detecting the distortion of the high-voltage output voltage and current.

[0014] Preferably, the current output by the low-temperature plasma power supply is alternating current, the output power range is 0-2500W, and the output voltage range is 0-30kV.

[0015] Preferably, the low-temperature plasma power supply can adjust the output frequency, and the adjustable frequency range is 5kHz-20kHz.

[0016] Preferably, the digital oscilloscope can detect instantaneous current and integrated current.

[0017] Preferably, the probe of the digital oscilloscope may be in a hook shape or a probe shape.

[0018] Preferably, the upper support panel in the support device can be made of one of quartz, ceramic, and glass fiber reinforced plastic.

[0019] Preferably, the material of the support base under the support device can be one or more of stainless steel, aluminum alloy, and carbon steel.

[0020] Preferably, the upper support panel and the lower support base in the support device may be embedded with a level meter for level calibration.

[0021] Preferably, the adjusting rod can adjust the height of the discharge space by rotating the positioning knob.

[0022] Preferably, the medium fixing device can adjust the medium fixing height by turning a knob above the upper support panel.

[0023] Preferably, the material of the dielectric sheet in the dielectric fixing device may be one or more of quartz, ceramic, and sapphire.

[0024] Preferably, the medium sheet in the medium fixing device can be replaced according to different prepreg production line speeds, and the sizes of medium sheets of length 120cm×width 100cm×thickness 1cm, length 120cm×width 70cm×thickness 1cm and length 120cm×width 40cm×thickness 1cm can be selected.

[0025] Preferably, the emitting device comprises an upper electrode and a lower electrode, the upper electrode is connected to a high voltage terminal voltage, and the lower electrode is connected to a low voltage terminal voltage.

[0026] Preferably, the upper electrode and the lower electrode of the emitting device include one or more layers of electrode sheets.

[0027] Preferably, the electrode sheet can be changed in size according to different prepreg production line speeds, and electrode sheets of length 120cm×width 100cm×thickness 1cm, length 120cm×width 70cm×thickness 1cm and length 120cm×width 40cm×thickness 1cm can be selected.

[0028] Preferably, the low-temperature plasma discharge device can break through the air between the electrodes to generate discharge at an ambient temperature of 10°C-40°C, an ambient humidity of 30%-80% and an ambient pressure of 0.1-0.3MPa, and the discharge form can be one of filamentary discharge, uniform discharge and pattern discharge.

[0029] Preferably, the connecting support truss can be height-adjusted by an electric device.

[0030] Compared with the prior art, the present invention has the following positive effects:

[0031] 1. The plasma treatment device described in the present invention can be combined with a film calendering prepreg machine. By adding a plasma treatment process in the prepreg production process, it is possible to treat and modify the surface of organic fiber bundles and fabrics during the prepreg production process, improve the interface performance between organic fibers and resins, and facilitate mass production.

[0032] 2. The plasma surface treatment method of the present invention can enable the organic fiber to quickly enter the resin impregnation and pressing process after treatment, thereby avoiding the problem of deactivation of the organic fiber due to long-term contact with air after plasma treatment.

[0033] 3. The present invention can be applied to the modification of various organic fiber prepregs, such as polyimide fiber, aramid fiber, ultra-high molecular weight polyethylene, etc.

[0034] 4. The sizes of the electrode sheet and dielectric sheet of the present invention can be changed according to the speed of the prepreg production line, and can adapt to the prepreg production line speed of 1-6m / min. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the prepreg production process of the organic fiber air plasma surface treatment device and method for the film calendering prepreg machine described in the present invention, including a yarn spreading process, a glue coating process, a plasma treatment process, a lamination process, a cooling process and a winding process. Compared with the traditional film calendering prepreg production process, a plasma treatment process is added. The air plasma surface treatment device and method described in the present invention are processed in the plasma treatment process. Among them, the plasma treatment process is carried out using the organic fiber air plasma surface treatment device for the film calendering prepreg machine described in the present invention, including 1 low-temperature plasma power supply, 2 voltage regulators, 3 digital oscilloscopes, 4 low-temperature plasma discharge devices and 5 connecting support trusses.

[0036] Figure 2 Schematic diagram of the low-temperature plasma discharge device 4 of the present invention; including a support device consisting of a lower support base 6, a ground wire terminal 7, an upper support plate 11 and a high-voltage connection terminal 12; an adjustment rod consisting of an adjustment rod column 9, an adjustment rod nut 10 and a positioning knob 14; a medium fixing device consisting of an adjustment knob 13, a medium fixing bracket 15 and a medium sheet 8; and an emission device consisting of an electrode sheet 16 and an electrode column 17. DETAILED DESCRIPTION

[0037] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present invention.

[0038] Example 1

[0039] like Figure 1 As shown, an organic fiber air plasma treatment device used in a film calendering prepreg machine needs to be used in an additional plasma treatment process after the yarn spreading process and the glue coating process and before the pressing process.

[0040] like Figure 1 As shown, an organic fiber air plasma surface treatment device for a film calendering prepreg machine, the air plasma surface treatment device comprises 1 low-temperature plasma power supply, 2 voltage regulator, 3 digital oscilloscope, 4 low-temperature plasma discharge device, 5 connecting support truss. The specific implementation process is as follows:

[0041] (1) 1 low-temperature plasma power supply, 2 voltage regulator and 3 digital oscilloscope are placed on one side of the prepreg production line after being electrically connected. 4 low-temperature plasma discharge device is fixed in front of the pressing device of the prepreg production line through 5 connecting support trusses, and is kept at a distance of 30cm-50cm from the above pressing device.

[0042] (2) Preferably, the 1 low-temperature plasma power supply, 2 voltage regulator and 3 digital oscilloscope can be integrated into a control host. The bottom of the control host is equipped with rollers, which can be moved as needed, making the operation more convenient.

[0043] (3)4 The low-temperature plasma discharge device needs to be adjusted according to the position of the organic fiber fabric before the system is powered on. First, select 16 electrode sheets and 8 dielectric sheets of appropriate size according to the prepreg production line speed. Here are several size references: 16 electrode sheets and 8 dielectric sheets with a length of 120cm×width of 100cm×thickness of 1cm can adapt to a production line speed of 4-6m / min; 16 electrode sheets and 8 dielectric sheets with a length of 120cm×width of 70cm×thickness of 1cm can adapt to a production speed of 2-4m / min; 16 electrode sheets and 8 dielectric sheets with a length of 120cm×width of 40cm×thickness of 1cm can adapt to a production speed of 1-2m / min. The principle of selection is to try to make the processing time of the organic fiber fabric passing through the electrode sheets and dielectric sheets close to 10s under a certain production speed. Remove and fix the selected 16 electrode sheets through the 17 electrode column. Adjust the selected 8 dielectric sheets through the 13 adjustment knob and fit them with the 16 electrode sheets and then fix them. Then adjust the 14 positioning knobs to make the organic fiber fabric between 0.5-1 cm and the 8 medium sheet to ensure that the organic fiber fabric can pass smoothly and be modified.

[0044] (4) The organic fiber fabric after being unrolled in the production line is passed between 8 dielectric sheets of 4 low-temperature plasma discharge devices, and the tension of the organic fiber fabric is adjusted to ensure that the organic fiber fabric does not contact the dielectric sheet.

[0045] (5) Connect 1 low-temperature plasma power supply and 4 low-temperature plasma discharge device with silicone high-voltage wire, wherein the high-voltage output is connected to 12 high-voltage connection terminal, and the low-voltage output is connected to 7 ground wire terminal.

[0046] (6) Preferably, high-voltage wires should be suspended in the air or fixed with insulating materials. They should not be close to, entangled with, or close to low-voltage wires, ground wires, or other metals or semiconductors. High-voltage wires should be as short as possible.

[0047] (7) Connect the low-temperature plasma power supply 1 and the voltage regulator 2 to the 220V power supply respectively, and adjust the output voltage of the voltage regulator 2 to 0V. Then, turn on the low-temperature plasma power supply 1. At this time, the low-temperature plasma current display and voltage display have digital display. Connect the digital oscilloscope 3 to the low-temperature plasma power supply 1 through the probe.

[0048] (8) Slowly adjust the voltage regulator 2 to gradually increase the voltage to the preset output power corresponding voltage, and at the same time observe the discharge size of the low-temperature plasma discharge device 4 and the waveform of the digital oscilloscope 3 until the waveform of the digital oscilloscope 3 is completely stable.

[0049] (9) The prepreg production line is started, and the organic fiber fabric is made to pass through 4 low-temperature plasma discharge devices evenly at a preset production speed and then enter a pressing process, and the plasma treatment modification of the organic fiber fabric is completed.

[0050] (10) Preferably, a tension control roller and a counter can be further added to the 5 connecting support trusses installed with the 4 low-temperature plasma discharge devices, so as to control the tension and length count of the modified organic fiber fabric.

[0051] Test Example 1

[0052] The organic fiber air plasma surface treatment device for the prepreg machine of the film calendering method of the present invention was used to modify the 0.2 mm thick polyimide fiber fabric, and the electrode sheet and dielectric sheet with a length of 120 cm × a width of 70 cm × a thickness of 1 cm were used to treat and modify the fabric for 10 seconds at output powers of 850 W, 950 W, and 1050 W, respectively. The tow in the central area of ​​the modified polyimide fiber fabric was compounded with the polyimide resin and the interface shear strength was measured by sampling, and the test results are shown in Table 1.

[0053] Table 1

[0054] Processing Interface shear strength (MPa) Relative growth (%) Unprocessed 22.3 / 850W / 10s 27.1 21.5 950W / 10s 29.9 34.1 1050W / 10s 28.3 26.9

[0055] As shown in Table 1, after being treated by the air plasma surface treatment device of the present invention, the interface shear strength of the composite material after the polyimide fiber bundle and the polyimide resin are compounded is significantly improved. Among them, the interface shear strength of the sample treated at a plasma power of 950W has a relative increase of 34.1%, and the modification effect is the best. Therefore, 950W can be selected as the ideal processing power in the plasma treatment process. When the power is too large, the surface of the polyimide fiber is excessively damaged, affecting its interface performance.

[0056] Experimental Example 2

[0057] The organic fiber air plasma surface treatment device for the prepreg machine of the film calendering method of the present invention was used to modify the 0.2mm thick polyimide fiber fabric. The electrode sheet and dielectric sheet of 120cm long×70cm wide×1cm thick were used to treat and modify for 4s, 7s, 10s and 20s respectively at an output power of 950W. The purpose of this experiment is to simulate the time when the fabric passes through the electrode sheet and dielectric sheet of different sizes during plasma treatment. The fiber bundles in the central area of ​​the modified polyimide fiber fabric were compounded with the polyimide resin and the interface shear strength was measured by sampling. The measurement results are shown in Table 2.

[0058] Table 2

[0059] Processing Interface shear strength (MPa) Relative growth (%) Unprocessed 24.3 \ 950W / 4s 28.5 17.6 950W / 7s 28.2 16.0 950W / 10s 33.0 35.9 950W / 20s 32.6 34.2

[0060] As can be seen from Table 2, after being treated and modified by the air plasma surface treatment device described in the present invention, the interfacial shear strength of the polyimide fiber fabric has been improved to varying degrees. The interfacial shear strength of the sample with a treatment modification time of 4s increased by 17.6% relative to the untreated sample, which shows that the short-term treatment modification has improved the interfacial strength of the polyimide fiber. The interfacial shear strength of the sample with a treatment modification time of 10s has the highest improvement, which is 35.9%, while the interfacial shear strength of the sample with a treatment modification time of 20s has increased by 34.2%, which is close to the improvement effect of the sample with a treatment time of 10s. This shows that when the sample is treated and modified for about 10s, the interfacial shear strength of the sample can be improved to a better effect. Therefore, the selection provided by the dielectric sheet size described in the present invention is compatible with the prepreg production line speed. When selecting electrode sheets and dielectric sheets of different sizes, it is ensured that the organic fiber fabric is treated and modified for about 10s when passing through the air plasma surface treatment device, so that the treatment and modification effect is optimal.

[0061] Experimental Example 3

[0062] The organic fiber air plasma surface treatment device for the prepreg machine of the film calendering method of the present invention was used to modify the 0.8 mm thick aramid fabric, and the electrode sheet and dielectric sheet with a length of 120 cm × a width of 100 cm × a thickness of 1 cm were used to treat and modify the fabric for 10 seconds at output powers of 1400 W, 1500 W, and 1600 W, respectively. The tows in the central area of ​​the modified aramid fabric were compounded with the bismaleimide resin and the interface shear strength was measured by sampling. The test results are shown in Table 3.

[0063] Table 3

[0064] Processing Interface shear strength (MPa) Relative growth (%) Unprocessed 60.93 / 1400W / 10s 80.5 32.2 1500W / 10s 86.5 40.2 1600W / 10s 82.86 36.0

[0065] As shown in Table 3, after being treated by the air plasma surface treatment device of the present invention, the interface shear strength of the composite material after the aramid bundle and the bismaleimide resin are compounded has also increased by about 32.2%-40.2%, and the air plasma surface treatment device and treatment method show good adaptability to different organic fiber and resin combinations. The interface shear strength growth rate of the sample treated at a power of 1500W is 4.2% higher than that of the sample treated at a power of 1600W. Therefore, under the premise of ensuring the plasma surface treatment effect of aramid fabric, it is most appropriate to select a power of 1500W as the standard treatment power.

[0066] Experimental Example 4

[0067] The organic fiber air plasma surface treatment device for the film calendering prepreg machine of the present invention was used to modify the ultra-high molecular weight polyethylene fiber with a thickness of 0.5 mm, and the electrode sheet and dielectric sheet with a length of 120 cm × a width of 40 cm × a thickness of 1 cm were used to treat and modify the fiber for 10 seconds at an output power of 400 W, 500 W, and 600 W, respectively. The fiber bundles in the central area of ​​the modified ultra-high molecular weight polyethylene fiber fabric were compounded with epoxy resin and the interface shear strength was measured by sampling, and the test results are shown in Table 4.

[0068] Table 4

[0069] Processing Interface shear strength (MPa) Relative growth (%) Unprocessed 5.13 / 400W / 10s 6.99 36.3 500W / 10s 7.45 45.2 600W / 10s 7.36 43.5

[0070] As shown in Table 4, after being treated by the air plasma surface treatment device of the present invention, the interfacial shear strength of the composite material of the ultra-high molecular weight polyethylene fiber fabric and the epoxy resin has also increased by 36.3%-45.2%. This shows that the air plasma surface treatment device and treatment method show good adaptability to different organic fiber and resin combinations.

[0071] In summary, the air plasma surface treatment device and treatment method described in the present invention can be used for surface modification of organic fibers such as polyimide fiber, aramid fiber, ultra-high molecular weight polyethylene, and can adapt to the prepreg preparation process of various organic fibers and resin combinations with polyimide resin, bismaleimide resin, epoxy resin, etc. as the matrix, thereby improving the interface bonding performance between the resin and the organic fiber.

[0072] Although the embodiments and experimental columns of the present invention have been shown and described, they are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. An organic fiber air plasma surface treatment device and method for a film calendering prepreg machine, characterized in that: The air plasma surface treatment device can be combined with a film calendering prepreg machine. By adding a plasma treatment process to the traditional film calendering production process, the surface of the organic fiber can be modified during the prepreg production process, thereby improving the interface performance between the organic fiber and the resin and enhancing the bonding strength between the resin and the organic fiber.

2. The organic fiber air plasma surface treatment device for a film calendering prepreg machine according to claim 1, characterized in that: The device needs to be installed after the yarn spreading process and the gluing process of the prepreg production process and before the pressing process. The air plasma surface treatment device can be used for the treatment and modification of various organic fibers such as polyimide fiber, aramid fiber, and ultra-high molecular weight polyethylene fiber. The applicable prepreg production line speed is 1-6m / min.

3. The organic fiber air plasma surface treatment device for a film calendering prepreg machine according to claim 1, characterized in that: It consists of five parts: a low-temperature plasma power supply, a voltage regulator, a digital oscilloscope, a low-temperature plasma discharge device, and a connecting support truss. The low-temperature plasma power supply is the main switch of the entire air plasma surface treatment device, and provides output current for the entire air plasma surface treatment device, including a current display and a voltage display. The voltage regulator consists of an ohmmeter and a voltage adjustment knob, which can adjust the output voltage in real time. The digital oscilloscope is connected to the low-temperature plasma power supply device, and can detect the stability of the output waveform and the size of the waveform parameters in real time. The low-temperature plasma discharge device consists of a supporting device, an adjusting rod, a medium fixing device, and an emitting device. It is the core component of the air plasma surface treatment device, and can perform plasma discharge bombardment on the fibers passing through the low-temperature plasma discharge device, thereby activating the fiber surface, enhancing the fiber surface activity, improving the wettability of the organic fiber and the resin, and the interface bonding performance of the composite material after curing.

4. The low-temperature plasma power supply according to claim 3, characterized in that: The output current is AC, the output power range is 0-2500W, and the output voltage range is 0-30kV.

5. The digital oscilloscope according to claim 3, characterized in that: It is connected to a low-temperature plasma power source through a hook-shaped or probe-mounted probe, and can detect the frequency, peak value, minimum value and other parameter information of the output waveform in real time to determine the stability of the plasma discharge.

6. The low-temperature plasma discharge device according to claim 3, characterized in that: It is fixed before the lamination process of the prepreg production line by connecting the support truss and keeps a distance of 30cm-50cm from the lamination device. The low-temperature plasma discharge device is connected to the low-temperature plasma power supply through a silicone high-voltage wire.

7. The adjusting rod according to claim 3, characterized in that: The height of the discharge space of the low-temperature plasma discharge device can be adjusted by turning the adjustment knob.

8. The electrode sheet and dielectric sheet according to claim 3, characterized in that: The size of the electrode sheet and the dielectric sheet can be changed according to the production speed of the prepreg, and the electrode sheet and the dielectric sheet can be selected respectively with the size of 120cm long × 100cm wide × 1cm thick, 120cm long × 70cm wide × 1cm thick, and 120cm long × 40cm wide × 1cm thick. The electrode sheet can be removed and fixed by the electrode column, and the dielectric sheet can be adjusted in height by adjusting the dielectric fixing device knob on the upper support panel.

9. The transmitting device according to claim 3, characterized in that: It is composed of an electrode column and a multi-layer electrode sheet, including an upper electrode and a lower electrode, the upper electrode is connected to a high voltage terminal voltage, and the lower electrode is connected to a low voltage terminal voltage. The upper electrode and the lower electrode each contain one or more layers of electrode sheets, and can achieve discharge by breaking through the air between the electrodes at an ambient temperature of 10°C-40°C, an ambient humidity of 30%-80%, and an ambient pressure of 0.1-0.3MPa. The discharge form can be one of filamentary discharge, uniform discharge, and pattern discharge.

10. The connecting support truss according to claim 3, characterized in that: It provides support for the plasma discharge device and can connect the yarn spreading device and the pressing device, so that the present invention is combined with the film calendering prepreg machine to achieve the purpose of increasing the plasma treatment process.

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