Method and device for inspecting skew weft of semi-cured glass fiber cloth
By using an automated detection method that combines a CCD lens, an electric motor, and parallel lights, the problems of low efficiency and insufficient accuracy in the detection of prepreg skew have been solved, achieving efficient and accurate skew measurement.
Patent Information
- Application Number
- CN202510953761.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-11
- Publication Date
- 2026-01-09
AI Technical Summary
In existing technologies, the skew detection efficiency of prepregs is low and easily affected by manual operation, making it difficult to meet the high-precision warp requirements.
Using a CCD lens and an electric motor in conjunction with a parallel lamp, light passes through the prepreg, and the CCD lens automatically captures the outline of the glass cloth pattern. Combined with color and size measurement software, automated detection is performed, and the weft slant is calculated.
It achieves efficient and accurate weft skew detection, improves detection efficiency and accuracy, adapts to glass cloth of different colors and thicknesses, and reduces errors caused by human intervention.
Smart Images
Figure CN121295481A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of prepreg skew measurement technology, specifically to a method and apparatus for testing the skew of glass fiber cloth in prepreg. Background Technology
[0002] As smartphones, wearable devices, 5G communications, servers, switches, and other products continue to pursue thinner, lighter, and higher-performance requirements, the quality standard for PCB warpage has been tightened from <0.75% in the industry to <0.5%, with some high-density electronic components requiring PCB warpage of <0.3%. To meet these warpage quality requirements, the warpage of copper-clad laminates and prepregs has also become more stringent, with the skewness of the prepreg being a significant factor affecting the warpage of both.
[0003] Prepreg is composed of fiberglass cloth, resin, and fillers. The fiberglass cloth is often simply called glass cloth. After adding fillers to the resin, glass is immersed in the resin, and then the resin is squeezed to evenly coat the glass cloth. Finally, it is dried to complete the manufacturing process. The glass cloth is white, while the resin comes in various colors with significant color variations. However, once the glass cloth is coated with resin, it cannot be visually inspected, and it's impossible to confirm whether the glass cloth has developed a skew during processing. The industry commonly uses a method of manually outlining the glass cloth and then measuring the skew using a semicircular measuring instrument. This method is inefficient and its accuracy is easily affected by the operator's skill in drawing the outline. Summary of the Invention
[0004] The purpose of this invention is to provide a method and apparatus for testing the weft skew of semi-cured glass fiber cloth, so as to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for testing the weft skew of semi-cured glass fiber cloth, comprising: S1: Lay the prepreg flat on the flat glass of the test base; S2: Light emitted by parallel lights beneath the flat glass penetrates the prepreg. S3: The electric motor on the displacement component located above the flat glass works to make the CCD lens move from left to right at a constant speed. During the movement, the CCD lens captures the graphic outline of the glass cloth and transmits the captured graphic outline to the computer processing terminal. S4: The computer processing unit uses color processing software to filter out the resin color and deepen the color of the glass cloth to make its outline clear. S5: The computer processing unit measures the warp and weft skew of the glass cloth using dimensional measurement software and calculates the slope of the glass cloth.
[0006] Furthermore, the brightness of the parallel lamp is adjustable to accommodate the testing requirements of resins and glass cloths of different colors.
[0007] Furthermore, the surface of the flat glass is polished to reduce light reflection and refraction errors, thereby improving the clarity and accuracy of image acquisition and enhancing the reliability of measurement results.
[0008] Furthermore, the distance between the CCD lens and the flat glass is adjustable, and can be optimized and adjusted according to actual detection needs and glass cloth thickness, further improving the adaptability and accuracy of the detection.
[0009] A device for testing the weft skew of semi-cured glass fiber cloth, used to implement the above method, comprising: An inspection base, wherein multiple parallel lights are installed inside the inspection base, and a flat glass plate is provided above the multiple parallel lights; A displacement assembly is located above the flat glass. The displacement assembly includes a sliding plate, a first slide rail, and a second slide rail. The sliding plate is slidably mounted on the first slide rail and the second slide rail. An electric motor for driving the sliding plate to move is installed on the sliding plate. A CCD lens, wherein the CCD lens is mounted on a skateboard; The computer processing unit is electrically connected to the CCD lens.
[0010] Furthermore, a light groove is provided on the upper side of the inspection base, and multiple parallel lights are nested in the light groove. The flat glass is installed at the opening of the light groove.
[0011] Furthermore, the second slide rail is arranged parallel to the first slide rail, and a rack is fixed on the side of the second slide rail away from the first slide rail. The output end of the electric motor rotates through the slide plate and is connected to a gear. The gear meshes with the rack. By adopting the meshing transmission method of gear and rack, the electric motor can accurately control the movement of the slide plate, ensuring the uniform movement of the CCD lens and improving the stability and consistency of image acquisition.
[0012] Furthermore, support rods are installed at the four upper corners of the inspection base. The left and right ends of the first and second slide rails are connected to connecting plates. A collar is fixed to the corresponding support rod on the connecting plate. The collar is sleeved on the corresponding support rod. A locking knob is threaded into the side wall of the collar. The tail end of the locking knob abuts against the outer wall of the support rod. Through the structural design of the support rods, connecting plates, collars, and locking knobs, the first and second slide rails are stably installed and their positions are adjusted, thereby adjusting the height of the CCD lens and the distance between the CCD lens and the flat glass.
[0013] Furthermore, a support base is fixed to the front side of the inspection base, and the computer processing terminal is installed on the support base. The computer processing terminal is equipped with color processing software and size measurement software, which realizes the automation of image processing and measurement, and improves the detection efficiency and accuracy.
[0014] Furthermore, a control panel is installed on the front side of the inspection base. The control panel is electrically connected to the parallel lamp, the electric motor, and the CCD lens. The control panel controls the operation of the parallel lamp, the electric motor, and the CCD lens, and can adjust the brightness of the parallel lamp and the speed of the CCD lens movement.
[0015] The technical effects and advantages provided by the present invention in the above technical solution are as follows: 1. After the light from the parallel lamp passes through the prepreg, the CCD lens collects the graphic outline. Then, the color processing software and size measurement software on the computer processing terminal process and measure the outline graphic data, and the measurement results are accurate and reliable. 2. Automated detection has been achieved. The electric motor controls the CCD lens to move at a constant speed, and the computer processing end automatically processes the image and calculates the skew, which improves the detection efficiency. 3. The parallel lamp brightness is adjustable, the flat glass is polished, and the distance between the CCD lens and the flat glass is adjustable, which can adapt to different colors of resin and glass cloth, and has a wide detection range. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.
[0017] Figure 1 This is a schematic diagram of the method flow of the present invention; Figure 2 This is a schematic diagram of the electrical equipment connection of the present invention; Figure 3 This is a schematic diagram of the testing device of the present invention; Figure 4 This is a schematic diagram of the testing base of the present invention; Figure 5 This is a schematic diagram of the displacement component structure of the present invention; Figure 6 This is a schematic diagram of the displacement component of the present invention from another angle.
[0018] Explanation of reference numerals in the attached figures: 1. Inspection base; 2. Parallel light; 3. Flat glass; 4. Slide plate; 5. First slide rail; 6. Second slide rail; 7. Electric motor; 8. CCD lens; 9. Computer processing unit; 10. Lamp trough; 11. Rack; 12. Gear; 13. Support rod; 14. Connecting plate; 15. Collar; 16. Locking knob; 17. Support base; 18. Control panel. Detailed Implementation
[0019] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.
[0020] like Figures 1 to 6 As shown, this invention provides a method for testing the weft skew of semi-cured glass fiber cloth, comprising: S1: Lay the prepreg flat on the flat glass 3 of the inspection base 1; S2: Light emitted by the parallel lamp 2 below the flat glass 3 penetrates the prepreg; S3: The electric motor 7 on the displacement assembly located above the flat glass 3 works to make the CCD lens 8 move from left to right at a constant speed. During the movement, the CCD lens 8 captures the graphic outline of the glass cloth and transmits the captured graphic outline to the computer processing terminal 9. S4: Computer processing unit 9 uses color processing software to filter out the resin color and deepen the color of the glass cloth to make its outline clear. S5: The computer processing terminal 9 measures the warp and weft skew of the glass cloth using size measurement software and calculates the slope of the glass cloth.
[0021] Furthermore, the brightness of the parallel lamp 2 is adjustable to accommodate the testing needs of resins and glass cloths of different colors.
[0022] Furthermore, the surface of the flat glass 3 is polished to reduce light reflection and refraction errors, thereby improving the clarity and accuracy of image acquisition and enhancing the reliability of measurement results.
[0023] Furthermore, the distance between the CCD lens 8 and the flat glass 3 is adjustable, which can be optimized and adjusted according to actual testing needs and glass cloth thickness, further improving the adaptability and accuracy of testing.
[0024] In this invention, the light emitted by the parallel lamp 2 penetrates the prepreg, and the CCD lens 8 moves at a constant speed from left to right to capture the graphic outline of the glass cloth. The captured graphic outline is then transmitted to the computer processing terminal 9. The computer processing terminal 9 uses color processing software to filter out the resin color and deepen the color of the glass cloth to make its outline clear. It also uses size measurement software to measure the warp and weft skew of the glass cloth and calculates the slope of the glass cloth, thus realizing automated detection, improving detection efficiency, and ensuring accurate and reliable measurement results.
[0025] like Figures 2 to 6 As shown, a device for testing the weft skew of semi-cured glass fiber cloth, used to implement the above method, includes: Inspection base 1, multiple parallel lights 2 are installed inside the inspection base 1, and a flat glass 3 is provided above the multiple parallel lights 2. The displacement assembly is located above the flat glass 3. The displacement assembly includes a slide plate 4, a first slide rail 5, and a second slide rail 6. The slide plate 4 is slidably mounted on the first slide rail 5 and the second slide rail 6. An electric motor 7 that drives the slide plate 4 to move is mounted on the slide plate 4. CCD lens 8, CCD lens 8 is mounted on slide plate 4; Computer processing terminal 9 is electrically connected to CCD lens 8.
[0026] The upper side of the inspection base 1 is provided with a light groove 10, and multiple parallel lights 2 are nested in the light groove 10. The flat glass 3 is installed at the opening of the light groove 10.
[0027] The second slide rail 6 is set parallel to the first slide rail 5. A rack 11 is fixed on the side of the second slide rail 6 away from the first slide rail 5. The output end of the electric motor 7 rotates through the slide plate 4 and is connected to a gear 12. The gear 12 meshes with the rack 11. By using the meshing transmission method of the gear 12 and the rack 11, the electric motor 7 can accurately control the movement of the slide plate 4, ensuring the uniform movement of the CCD lens 8 and improving the stability and consistency of image acquisition.
[0028] Support rods 13 are installed at the four corners of the upper side of the inspection base 1. The left and right ends of the first slide rail 5 and the second slide rail 6 are connected to the connecting plate 14. The connecting plate 14 is fixed with a collar 15 corresponding to the position of the support rod 13. The collar 15 is sleeved on the corresponding support rod 13. The side wall of the collar 15 is threaded with a locking knob 16. The tail end of the locking knob 16 abuts against the outer wall of the support rod 13. Through the structural design of the support rod 13, the connecting plate 14, the collar 15 and the locking knob 16, the first slide rail 5 and the second slide rail 6 are stably installed and their positions are adjusted, thereby realizing the adjustment of the height of the CCD lens 8 and the distance between the CCD lens 8 and the flat glass 3.
[0029] A support base 17 is fixed to the front side of the inspection base 1. The computer processing terminal 9 is installed on the support base 17. The computer processing terminal 9 is equipped with color processing software and size measurement software, which realizes the automation of image processing and measurement, and improves the inspection efficiency and accuracy.
[0030] A control panel 18 is installed on the front side of the inspection base 1. The control panel 18 is electrically connected to the parallel lamp 2, the electric motor 7 and the CCD lens 8 respectively. The control panel 18 controls the operation of the parallel lamp 2, the electric motor 7 and the CCD lens 8, and can adjust the brightness of the parallel lamp 2 and the speed of movement of the CCD lens 8.
[0031] In this device, the semi-cured material to be tested is placed on a flat glass plate 3, ensuring it is flat and wrinkle-free. The parallel light 2 is activated via the control panel 18 to provide a uniform light source for testing. The electric motor 7 is activated, driving the slide plate 4 to move on the first slide rail 5 and the second slide rail 6, which in turn moves the CCD lens 8 at a constant speed from left to right. During the movement, the CCD lens 8 captures the graphic outline of the glass cloth in the semi-cured material and transmits the captured graphic outline to the computer processing terminal 9. The computer processing terminal 9 uses color processing software to filter out the resin color and deepen the color of the glass cloth to make its outline clear. It also uses size measurement software to measure the warp and weft skew of the glass cloth and calculates the slope of the glass cloth, which greatly improves the testing efficiency, saves time and labor costs, and improves the accuracy of the testing.
[0032] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.
Claims
1. A method for testing the weft skew of semi-cured glass fiber cloth, characterized in that, include: S1: Lay the prepreg flat on the flat glass (3) of the test base (1); S2: Light emitted by the parallel lamp (2) below the flat glass (3) penetrates the prepreg; S3: The electric motor (7) on the displacement assembly above the flat glass (3) works to make the CCD lens (8) move from left to right at a constant speed. During the movement, the CCD lens (8) captures the graphic outline of the glass cloth and transmits the captured graphic outline to the computer processing terminal (9). S4: The computer processing unit (9) filters out the resin color according to the color processing software and deepens the color of the glass cloth to make its outline clear. S5: The computer processing terminal (9) measures the warp and weft skew of the glass cloth through the size measurement software and calculates the slope of the glass cloth.
2. The method for testing the weft skew of semi-cured glass fiber cloth according to claim 1, characterized in that: The brightness of the parallel lamp (2) is adjustable to meet the testing requirements of resins and glass cloths of different colors.
3. The method for testing the weft skew of semi-cured glass fiber cloth according to claim 1, characterized in that: The surface of the flat glass (3) is polished to reduce the reflection and refraction errors of light.
4. The method for testing the weft skew of semi-cured glass fiber cloth according to claim 1, characterized in that: The distance between the CCD lens (8) and the flat glass (3) is adjustable.
5. A device for testing the weft skew of semi-cured glass fiber cloth, used to implement the method described in claim 1, characterized in that, include: Inspection base (1), wherein multiple parallel lights (2) are installed inside the inspection base (1), and a flat glass (3) is provided above the multiple parallel lights (2); The displacement assembly is located above the flat glass (3). The displacement assembly includes a sliding plate (4), a first slide rail (5) and a second slide rail (6). The sliding plate (4) is slidably mounted on the first slide rail (5) and the second slide rail (6). An electric motor (7) for driving the sliding plate (4) to move is installed on the sliding plate (4). CCD lens (8), said CCD lens (8) is mounted on slide plate (4); Computer processing terminal (9) is electrically connected to CCD lens (8).
6. The device for testing the weft skewness of semi-cured glass fiber cloth according to claim 5, characterized in that: The upper side of the inspection base (1) is provided with a lamp groove (10), and a plurality of parallel lamps (2) are nested in the lamp groove (10). The flat glass (3) is installed at the opening of the lamp groove (10).
7. The device for testing the weft skewness of semi-cured glass fiber cloth according to claim 5, characterized in that: The second slide rail (6) is arranged parallel to the first slide rail (5). A rack (11) is fixed on the side of the second slide rail (6) away from the first slide rail (5). The output end of the electric motor (7) rotates through the slide plate (4) and is connected to a gear (12). The gear (12) meshes with the rack (11).
8. The device for testing the weft skewness of semi-cured glass fiber cloth according to claim 5, characterized in that: Support rods (13) are installed at the four upper corners of the inspection base (1). The left and right ends of the first slide rail (5) and the second slide rail (6) are connected to a connecting plate (14). The connecting plate (14) is fixed with a collar (15) corresponding to the position of the support rod (13). The collar (15) is sleeved on the corresponding support rod (13). The side wall of the collar (15) is threaded with a locking knob (16). The tail end of the locking knob (16) abuts against the outer wall of the support rod (13).
9. The device for testing the weft skewness of semi-cured glass fiber cloth according to claim 5, characterized in that: The front side of the inspection base (1) is fixed with a support base (17), and the computer processing terminal (9) is installed on the support base (17). The computer processing terminal (9) is equipped with color processing software and size measurement software.
10. The device for testing the weft skewness of semi-cured glass fiber cloth according to claim 5, characterized in that: The front side of the inspection base (1) is equipped with a control panel (18), which is electrically connected to the parallel lamp (2), the electric motor (7) and the CCD lens (8).