Coating mechanism and flexible copper-clad plate production system

Abstract

The invention relates to the technical field of flexible copper-clad plate production equipment for flexible printed circuit boards, and provides a flexible copper-clad plate production system which comprises a coating mechanism and further comprises a tensioning roller set, the tensioning roller set comprises a carrier roller, the coating mechanism comprises a glue inlet box fixedly arranged relative to the ground, a glue inlet pipe is further installed on the glue inlet box, and a glue outlet pipe is installed on the glue inlet pipe. A mounting notch is concavely formed in one side of the lower end of the glue feeding box, a coating roller is rotatably mounted in the mounting notch, an overflow port which is communicated with the inside and the outside of the glue feeding box and is positioned at a higher position in the mounting notch is formed in the glue feeding box, and a glue guide hopper is further fixedly connected to the glue feeding box and is provided with a feeding port connected with the overflow port; the glue guiding hopper is further provided with a discharging port located below the feeding port, and a glue guiding roller partially extending downwards to the outside of the discharging port is rotationally installed at the discharging port. The glue guiding roller is located above the coating roller and is close to the coating roller. The problem that in the prior art, due to the fact that adhesive coating is possibly uneven, the quality stability of a terminal product is poor is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of production equipment for flexible copper clad laminates for flexible printed circuit boards, and particularly to a coating mechanism and a flexible copper clad laminate production system. Background Art

[0002] Flexible copper clad laminate (FCCL), also known as flexible copper clad laminate or soft copper clad laminate, is a copper clad laminate formed by bonding copper foil to one or both sides of a flexible insulating material through a specific process, and is widely used in fields such as 5G communication equipment, navigation and positioning equipment, and smartphones that require flexible printed circuit boards. Flexible copper clad laminates mainly consist of three parts: an insulating base film, copper foil, and an adhesive. The adhesive is used to bond the copper foil and the insulating base film together, and common adhesives include epoxy series and acrylate types. In the actual production process, the adhesive is coated on the insulating base film by a coating method, and then the copper foil is covered. The copper foil and the insulating base film are bonded together by the adhesive, and then the flexible copper clad laminate is dried to remove moisture and solvents to ensure the curing of the adhesive, improve the bonding strength of the board, and then subsequent lamination, hot pressing, and post-treatment are carried out. During the adhesive coating process, generally, an extrusion head is used to extrude the adhesive at a certain pressure and then coat it on the insulating base film. In the actual process, it is easy to have uneven coating, such as stripes and thickness deviation (for example, inaccurate control of the pressure and flow rate at the outlet of the extrusion head, or unreasonable setting of the gap between the coating roller and the coated roller will affect the uniformity of coating). Uneven coating will result in poor quality stability of the flexible copper clad laminate, which may lead to inconsistent bonding force between the copper foil and the insulating base film, thereby affecting the electrical and mechanical properties of the flexible printed circuit board, and ultimately resulting in poor quality stability of the end product. Summary of the Invention

[0003] Aiming at the deficiencies in the prior art, the present invention provides a coating mechanism, which solves the problem that the adhesive coating in the prior art may be uneven and ultimately leads to poor quality stability of the end product.

[0004] According to an embodiment of the present invention, a coating mechanism includes a fixed glue inlet box. A glue inlet pipe is also installed on the glue inlet box. One side of the lower end of the glue inlet box is recessed to form an installation notch. A coating roller is rotatably installed in the installation notch. An overflow port that communicates the inside and outside of the glue inlet box and is located at a relatively high position in the installation notch is provided on the glue inlet box. The glue inlet box is also fixedly connected with a glue guiding hopper, and the glue guiding hopper has a feed inlet connected to the overflow port. The glue guiding hopper also has a discharge outlet located below the feed inlet, and a glue guiding roller that partially extends downward outside is rotatably installed at the discharge outlet. The glue guiding roller is located above the coating roller and is arranged close to the coating roller. In this solution, the adhesive flows into the glue guiding hopper in an overflow manner, and then is transferred to the coating roller through the glue guiding roller, and then is coated on the insulating base film through the coating roller. During the process, the adhesive first enters the glue guiding hopper, and the glue output can be ensured to be stable by controlling the rotation speed of the glue guiding roller in the glue guiding hopper, thereby better controlling the adhesive amount of the coating, and further enabling the coating to proceed stably, solving the problem that the adhesive coating in the prior art may be uneven and ultimately lead to poor quality stability of the end product.

[0005] Further, the glue guiding hopper is also fixedly connected with an overflow glue box. The overflow glue box has an arc-shaped bottom plate located obliquely above the coating roller. The distance between the higher side and the lower side of the arc-shaped bottom plate and the roller surface of the coating roller gradually decreases, and the lower side with a smaller distance faces outside the installation notch. A number of gradually changing holes are also provided on the arc-shaped bottom plate. The aperture of the gradually changing hole at a lower position is smaller than the aperture of the gradually changing hole at a higher position.

[0006] Further, retaining rings are fixedly connected to both ends of the coating roller, and the glue guiding roller and the arc-shaped bottom plate are located between the two retaining rings.

[0007] Further, a lip plate that encloses a space with a narrower lower part and a wider upper part with the glue guiding roller is provided on the side of the glue guiding hopper facing away from the arc-shaped bottom plate, and the lip plate is located obliquely below the overflow port.

[0008] Further, a flexible pressing plate is connected to the lower end of the arc-shaped bottom plate. The flexible pressing plate has a free edge that extends obliquely downward towards the coating roller.

[0009] Further, a mounting plate is fixedly connected to the overflow glue box. An adjusting rod is threadedly connected to the mounting plate, and the adjusting rod is connected to one side of the free edge of the flexible pressing plate.

[0010] Further, a balance pipe that communicates the inside and outside of the overflow glue box is also connected to the overflow glue box.

[0011] Further, a pump body is also connected between the overflow glue box and the glue inlet box. The pump inlet pipe of the pump body is connected to the overflow glue box, and the pump outlet pipe is connected to the glue inlet pipe.

[0012] Further, it also includes two driving motors fixedly arranged on both sides of the glue inlet box to drive the coating roller and the glue guiding roller respectively, and both the coating roller and the glue guiding roller rotate clockwise.

[0013] According to an embodiment, a flexible copper clad laminate production system is further provided, which includes the above-mentioned coating mechanism and also includes a supporting roller, and the supporting roller is arranged close to the coating roller.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The adhesive is supplied into the glue guiding hopper in an overflow manner, and the rotation speed of the glue guiding roller is controlled to be constant so as to ensure the stable glue output, and further better control the amount of glue applied, so that the coating can be carried out stably, solving the problem that the adhesive coating in the prior art may be uneven and ultimately resulting in poor quality stability of the end product; at the same time, a flexible copper clad laminate production system including the coating mechanism is provided, which can stably carry out the adhesive coating, ensure the quality stability of the flexible copper clad laminate, and further make the flexible printed circuit board produced from the flexible copper clad laminate have stable electrical and mechanical properties, and ultimately ensure the quality stability of the end product (such as 5G communication equipment, navigation and positioning equipment, smart phones, etc.). BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present invention;

[0017] Figure 2 is a schematic diagram of the structure of the coating roller of an embodiment of the present invention;

[0018] Figure 3 is a partially enlarged schematic diagram of an embodiment of the present invention;

[0019] Figure 4 is Figure 3 a partially enlarged schematic diagram at position A in

[0020] Figure 5 is Figure 4 a partially enlarged schematic diagram at position B in

[0021] In the above-mentioned drawings:

[0022] supporting roller 1, tensioning roller 2, insulating base film 3, glue inlet box 4, glue inlet pipe 5, glue discharge port 6, coating roller 7, overflow port 8, glue guiding hopper 9, glue guiding roller 10, overflow glue box 11, arc bottom plate 12, driving motor 13, retaining ring 14, lip plate 15, material receiving groove 16, discharge groove 17, flexible pressing plate 18, mounting plate 19, adjusting rod 20, balance pipe 21, pump body 22, pump inlet pipe 23, pump outlet pipe 24, mounting notch 25, tapered hole 26. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The technical solutions in the present invention will be further described below with reference to the drawings and embodiments.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0025] In an exemplary embodiment, as Figures 1-5 shown, this embodiment provides a flexible copper clad laminate production system, which includes a coating mechanism and also includes a tension roller group. The tension roller group is composed of a plurality of tension rollers 2 and a support roller 1. The support roller 1 is located between the tension rollers 2. The coating mechanism is arranged close to the support roller 1. The insulating base film 3 moves through the tension roller group and is adhesively coated by the coating mechanism at the support roller 1. The provided coating mechanism includes a glue inlet box 4 fixedly arranged relative to the ground. A glue inlet pipe 5 is also installed on the glue inlet box 4. The glue inlet pipe 5 is used to introduce the adhesive into the glue inlet box 4. A glue discharge port 6 is also arranged at the bottom of the glue inlet box 4. The glue discharge port 6 is used to completely discharge the adhesive after the operation is completed. More specifically, an installation notch 25 is recessed on one side at the lower end of the glue inlet box 4. A coating roller 7 is rotatably installed in the installation notch 25. The installation notch 25 is also semi-circular accordingly. The coating roller 7 is arranged such that a part of it extends out of the installation notch 25 and is close to the support roller 1 to ensure that the adhesive can be transferred to the insulating base film 3 for coating. In this solution, a completely different adhesive supply method from the prior art is adopted. Specifically, an overflow port 8 communicating the inside and outside of the glue inlet box 4 and located at a relatively high position in the installation notch 25 is arranged on the glue inlet box 4. The glue inlet box 4 is also fixedly connected with a glue guiding hopper 9. The glue guiding hopper 9 has a feed inlet connected to the overflow port 8. The glue guiding hopper 9 also has a discharge outlet located below the feed inlet, and a glue guiding roller 10 extending downward partially outside is rotatably installed at the discharge outlet. The glue guiding roller 10 is located above the coating roller 7 and is arranged close to the coating roller 7. The adhesive first gradually increases in the glue inlet box 4, and then is introduced into the glue guiding hopper 9 through the overflow port 8 via the feed inlet. In the discharge outlet of the glue guiding hopper 9, the adhesive is constantly discharged and transferred to the coating roller 7 below by the rotation of the glue guiding roller 10. Then, the coating amount of the adhesive is smoothly ensured to be stable, thus solving the problem that the adhesive coating in the prior art may be uneven and ultimately lead to poor quality stability of the end product.

[0026] As Figures 1-5As shown, in a further solution, the glue guiding hopper 9 is also fixedly connected with an overflow glue box 11. The overflow glue box 11 has an arc-shaped bottom plate 12 located obliquely above the coating roller 7. The distance between the higher side and the lower side of the arc-shaped bottom plate 12 and the roller surface of the coating roller 7 gradually decreases, and the lower side with a smaller distance faces outward of the mounting notch 25. An arc-shaped channel is formed between the arc-shaped bottom plate 12 and the coating roller 7. The channel is wider at the higher end and narrower at the lower end. In this way, the adhesive transferred to the coating roller 7 is gradually pressed when passing through this channel, ensuring the uniform formation of a continuous film structure, and then being coated onto the adjacent insulating base film 3 in the form of a continuous film structure, further ensuring the uniformity of coating. In a more detailed solution, a driving motor 13 for respectively driving the glue guiding roller 10 and the coating roller 7 to rotate is also installed on the glue inlet box 4, and both the glue guiding roller 10 and the coating roller 7 rotate clockwise. Particularly, the supporting roller 1 and the coating roller 7 are arranged horizontally adjacent to each other. In this way: in the glue guiding hopper 9, the glue guiding roller 10 rotates clockwise, that is, it lifts the glue liquid upward on the side away from the supporting roller 1, then turns over the glue guiding roller 10 along the rotation of the glue guiding roller 10 to the other side and then discharges downward from the discharge port and is transferred to the coating roller 7. Finally, the adhesive can rotate with the coating roller 7 and cross the coating roller 7 and then be transferred to the insulating base film 3. Particularly, in this solution, the glue inlet box 4 supplies the adhesive to the glue guiding hopper 9 in an overflow manner, and then it is transferred through the glue guiding roller 10. In this way, the adhesive can be thrown downward at a certain speed and transferred to the lower coating roller 7, ensuring the stable supply of the adhesive.

[0027] As Figures 1-4 shown, further, retaining rings 14 are fixedly connected to both ends of the coating roller 7. The glue guiding roller 10, the arc-shaped bottom plate 12, and the supporting roller 1 are all located between the two retaining rings 14. The insulating base film 3 is wound around the supporting roller 1, and its width is also smaller than that of the supporting roller 1. In this way, it is ensured that the coating roller 7 can completely cover the insulating base film 3. More specifically, the horizontal position of the supporting roller 1 can be adjusted so that the insulating base film 3 and the coating roller 7 can be close or far from each other, enabling the coating to be carried out or stopped. A glue receiving container is arranged below the coating roller 7. At the same time, structures such as an auxiliary scraper can be used to scrape and collect the adhesive when coating is not carried out (i.e., when the supporting roller 1 is far away), preventing the adhesive from scattering. More specifically, the adhesive that has not been transferred to the insulating base film 3 on both sides of the coating roller 7 can also be collected in a similar manner.

[0028] As Figures 3-5As shown, specifically, on the side of the glue guide hopper 9 facing away from the arc-shaped bottom plate 12, there is a lip plate 15 that encloses a space with a narrower lower part and a wider upper part together with the glue guide roller 10, and the lip plate 15 is located diagonally below the overflow port 8. In this way, a material receiving groove 16 located diagonally below the feeding port is formed at the discharging port, and a discharging groove 17 is formed on the other side of the glue guide roller 10 (i.e., closer to the supporting roller 1). The lower ends of both the material receiving groove 16 and the discharging groove 17 are open, so that the rotation of the glue guide roller 10 is not affected. At the same time, the lower end opening of the material receiving groove 16 is smaller, so that with the assistance of the rotation of the glue guide roller 10, the adhesive can be turned upwards and will not leak down through this lower end opening, while the larger lower end opening of the discharging groove 17 smoothly supplies the adhesive to be discharged.

[0029] As Figures 3-5 shown, more specifically, a number of gradient holes 26 are also provided on the arc-shaped bottom plate 12. The aperture of the gradient holes 26 at a lower position is smaller than that of the gradient holes 26 at a higher position. In this way, a plurality of communication holes (i.e., these gradient holes 26) are formed on the upper side of the arranged channel. When the adhesive passes through the channel, it will be pressed upwards through these holes into the overflow glue box 11 to prevent excessive adhesive. Further, a flexible pressing plate 18 is connected to the lower end of the arc-shaped bottom plate 12. The flexible pressing plate 18 has a free edge extending obliquely downwards towards the coating roller 7, and the distance between the free edge and the coating roller 7 is smaller. The adhesive passing through the channel is finally further smoothed by the flexible pressing plate 18 and then transferred and coated onto the insulating base film 3, further ensuring the uniform coating of the adhesive. More specifically, the arranged flexible pressing plate 18 is detachably connected. Specifically, an installation plate 19 is fixedly connected to the overflow glue box 11. The installation plate 19 is threadedly connected with an adjusting rod 20, and the adjusting rod 20 is connected to one side of the free edge of the flexible pressing plate 18 (it can be threadedly connected or clamped for easy disassembly), and the higher side of the flexible pressing plate 18 can be connected to the arc-shaped bottom plate 12 (i.e., in contact or separated). The flexible pressing plate 18 is mainly restricted by the adjusting rod 20 and the installation plate 19 to be stable, so it is also convenient for disassembly and maintenance (the flexible pressing plate 18 can be made of elastic rubber material and may age after a period of use, so it needs to be disassembled and replaced).

[0030] As Figures 3-5 shown, in a further solution, a balance pipe 21 connecting the inside and outside of the overflow glue box 11 is also connected to the overflow glue box 11, so that the adhesive can smoothly enter the overflow glue box 11. Further, a pump body 22 is connected between the overflow glue box 11 and the glue inlet box 4. The pump inlet pipe 23 of the pump body 22 is connected to the overflow glue box 11 and extends to the lower end inside, and the pump outlet pipe 24 is connected to the glue inlet pipe 5. In this way, when there is more adhesive in the overflow glue box 11 (i.e., after submerging above the lower end inlet of the pump inlet pipe 23), it can be introduced into the glue inlet box 4 through the pump body 22 to prevent excessive amount from being exported through the balance pipe 21.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A coating mechanism, characterized in that: The invention comprises a fixedly arranged glue feeding box, a glue feeding pipe is also installed on the glue feeding box, a mounting notch is recessed on one side of the lower end of the glue feeding box, a coating roller is rotatably installed in the mounting notch, an overflow port which is connected with the inside and outside of the glue feeding box and is located at a higher position in the mounting notch is provided on the glue feeding box, the glue feeding box is also fixedly connected with a glue guiding hopper, and the glue guiding hopper has a feeding port connected with the overflow port, the glue guiding hopper also has a feeding port located below the feeding port, and a glue guiding roller which partially extends downward to the outside of the glue guiding roller is rotatably installed at the feeding port, and the glue guiding roller is located above the coating roller and is arranged close to the coating roller.

2. The coating mechanism according to claim 1, characterized in that: The glue guiding hopper is also fixedly connected to an overflow glue box, which has an arc-shaped bottom plate located obliquely above the coating roller, and the distance between the higher side to the lower side of the arc-shaped bottom plate and the roller surface of the coating roller gradually decreases, and the lower side with the smaller distance is arranged toward the outside of the mounting notch, and a plurality of gradient holes are also arranged on the arc-shaped bottom plate, and the aperture of the gradient holes located at the lower position is smaller than the aperture of the gradient holes located at the higher position.

3. The coating mechanism according to claim 2, characterized in that: The two ends of the coating roller are also fixedly connected with retaining rings, and the rubber guide roller and the arc bottom plate are located between the two retaining rings.

4. The coating mechanism according to claim 2, characterized in that: A lip plate is arranged on one side of the glue guiding hopper away from the arc bottom plate, and is combined with the glue guiding roller to form a space that is narrow at the bottom and wide at the top, and the lip plate is located obliquely below the overflow port.

5. The coating mechanism according to claim 2, characterized in that: The lower end of the arc-shaped bottom plate is also connected to a flexible pressing plate, and the flexible pressing plate has a free edge extending obliquely downward toward the coating roller.

6. The coating mechanism according to claim 5, characterized in that: The overflow glue box is also fixedly connected with a mounting plate, the mounting plate is threadedly connected with an adjusting rod, and the adjusting rod is connected to one side of the free edge of the flexible pressing plate.

7. The coating mechanism according to claim 2, characterized in that: The overflow glue box is also connected with a balance pipe communicating with the inside and outside of the overflow glue box.

8. The coating mechanism according to claim 2, characterized in that: A pump body is also connected between the overflow glue box and the glue inlet box, a pump inlet pipe of the pump body is connected to the overflow glue box, and a pump outlet pipe is connected to the glue inlet pipe.

9. The coating mechanism according to any one of claims 1 to 8, characterized in that: It also includes two driving motors fixedly arranged on both sides of the glue feeding box to drive the coating roller and the glue guiding roller respectively, and the coating roller and the glue guiding roller both rotate clockwise.

10. A flexible copper clad laminate production system, characterized in that: It comprises a coating mechanism as described in any one of claims 1 to 8, and also comprises a support roller, wherein the support roller is arranged close to the coating roller.

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