A laminating device for a multi-layer film

Abstract

The utility model relates to a kind of laminating device for multilayer film, belong to film laminating technical field.The laminating device for multilayer film, including: rack, substrate passes through rack center, substrate upper and lower sides are provided with film, also from rack inside pass through;Gluing mechanism, set up on rack, for the gluing of substrate upper and lower sides, substrate and film are laminated;Pressing mechanism, set up on rack, the film and substrate after lamination are rolled;Wherein, the gluing roller one end rotation is connected with telescopic pipe, the telescopic pipe is fixedly connected with glue pipe on it, and glue barrel is set up on the rack with glue pipe intercommunication.Gluing mechanism is set, substrate passes through the middle of two gluing rollers, and the gluing of substrate upper and lower sides is carried out, the synchronous film lamination of substrate upper and lower sides is realized, and the warping caused by distribution film lamination is avoided;Glue flows out from glue outlet, after being evenly distributed by gluing sleeve, is applied on substrate, guarantee the uniformity of glue application.

Description

Technical Field

[0001] This utility model relates to the field of film bonding technology, and in particular to a bonding device for multilayer films. Background Technology

[0002] The laminating mechanism is mainly used to bond films to substrates. A laminating machine includes major mechanical parts such as an unwinding device, an adhesive coating device, a conveying and pressurizing device, and a drive motor. Fully automatic laminating machines are designed specifically for the production characteristics of small displays and small touch components, and are one of the essential pieces of equipment in LCD production. Laminating machine benches vary depending on the design of different machinery manufacturers; however, the components on the machine generally include: coating, drying, hot pressing, and cooling units.

[0003] As shown in the reference case "A Film Laying Mechanism" (publication number CN218144960U), it includes a film laminating frame and an adhesive storage tank. In this invention, the adhesive dispensing bottle and the adhesive collection tank head are fixedly connected by threads. The threaded fixing method provides good sealing, and the depth of thread rotation determines the installation height of the dispensing bottle. When the dispensing bottle is rotated counterclockwise, it can be lowered downwards, allowing the applicator nozzle to contact the substrate. The height of the dispensing bottle can be adjusted according to the thickness of the substrate to ensure smooth adhesive application. However, the above device has the following drawbacks:

[0004] Only one side of the substrate can be laminated at a time. When it is necessary to laminate both sides of the substrate, the lamination must be repeated, which is more troublesome. In addition, the step-by-step lamination can cause warping due to stress asymmetry. Utility Model Content

[0005] Therefore, it is necessary to provide a bonding device for multilayer films to address the warping problem caused by stress asymmetry due to step-by-step film bonding.

[0006] A multilayer film laminating device includes: a frame, a substrate passing through the center of the frame, and films disposed on the upper and lower sides of the substrate, also passing through the frame; an adhesive application mechanism disposed on the frame for applying adhesive to the upper and lower sides of the substrate to laminate the substrate and the films; and a pressing mechanism disposed on the frame for rolling the laminated films and substrate; wherein the adhesive application mechanism includes adhesive application rollers symmetrically disposed on the frame, each adhesive application roller having an adhesive outlet hole, one end of each adhesive application roller being rotatably connected to a telescopic tube, the telescopic tube being fixedly connected to a glue delivery pipe, and a glue tank connected to the glue delivery pipe being disposed on the frame.

[0007] In one embodiment, the frame is provided with symmetrical grooves, and a slider that is slidably connected to the coating roller is rotatably connected in the groove. A telescopic rod connected to the slider is provided in the groove, and the telescopic rod is perpendicular to the axis of the coating roller.

[0008] In one embodiment, a coating sleeve is fitted onto the surface of the coating roller, and the coating sleeve is the same length as the coating roller.

[0009] In one embodiment, a drive motor for driving the coating rollers to rotate is mounted on the side of the frame away from the telescopic tube, and the two coating rollers rotate in opposite directions.

[0010] In one embodiment, the pressing mechanism includes a mounting groove formed on the frame, an electric push rod is provided in the mounting groove, a slider is slidably connected to the telescopic end of the electric push rod in the mounting groove, and a pressure roller is rotatably connected to the slider.

[0011] In one embodiment, the telescopic end of the electric push rod is fixedly connected to a positioning block that is slidably connected in the mounting groove, and a spring is fixedly connected between the positioning block and the slider.

[0012] In one embodiment, the adhesive sleeve is made of porous ceramic or silicone material, and its surface has a uniformly distributed micro-protrusion structure, with the distance between adjacent adhesive outlet holes gradually decreasing from the side closer to the telescopic tube to the side farther from the adhesive tank.

[0013] In one embodiment, the outer wall of the glue delivery tube is covered with a heating layer, which is electrically connected to the temperature control system inside the glue tank.

[0014] Beneficial effects

[0015] An adhesive application mechanism is provided, in which the substrate passes between two adhesive rollers and adhesive is applied to the upper and lower sides of the substrate to achieve synchronous film bonding on the upper and lower sides of the substrate, avoiding warping caused by uneven film bonding; the adhesive flows out from the adhesive outlet, is evenly distributed by the adhesive sleeve, and is then applied to the substrate to ensure uniform adhesive application.

[0016] A pressing mechanism is set up, in which an electric push rod drives a slider to move, thereby changing the distance between two pressure rollers. The pressure rollers squeeze and eliminate air bubbles in the film and substrate, improving the bonding effect. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This utility model Figure 1 Enlarged schematic diagram of the structure at point A in the diagram;

[0020] Figure 3 This utility model Figure 2 Enlarged schematic diagram of the structure at point B in the diagram;

[0021] Figure 4 This is a schematic diagram of the structure of the coating roller of this utility model;

[0022] Figure 5 This is a structural diagram of the adhesive coating mechanism of this utility model.

[0023] Figure label:

[0024] 100. Frame; 200. Glue application mechanism; 210. Glue application roller; 211. Glue outlet; 212. Glue application sleeve; 220. Telescopic tube; 221. Glue delivery tube; 222. Glue bucket; 300. Pressing mechanism; 310. Pressure roller; 311. Slider; 312. Electric push rod. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0026] The following is combined with Figures 1-5 This invention describes a bonding device for multilayer films.

[0027] In one embodiment, a multilayer film bonding apparatus includes: a frame 100, a substrate passing through the center of the frame 100, and films disposed on the upper and lower sides of the substrate, also passing through the frame 100; an adhesive applicator 200 disposed on the frame 100 for applying adhesive to the upper and lower sides of the substrate to bond the substrate and the film; and a pressing mechanism 300 disposed on the frame 100 for rolling the bonded film and substrate; wherein the adhesive applicator 200 includes adhesive applicator rollers 210 symmetrically disposed on the frame 100, adhesive applicator rollers 210 having adhesive outlet holes 211, one end of adhesive applicator rollers 210 being rotatably connected to a telescopic tube 220, the telescopic tube 220 being fixedly connected to an adhesive delivery tube 221, and an adhesive tank 222 connected to the adhesive delivery tube 221 being disposed on the frame 100.

[0028] like Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, the frame 100 has symmetrically arranged sliding grooves, and sliding blocks that are slidably connected to the coating roller 210 are rotatably connected within the grooves. A telescopic rod connected to the sliding blocks is installed within the grooves, and the telescopic rod is perpendicular to the axis of the coating roller 210. A coating sleeve 212 is fitted onto the surface of the coating roller 210, and the coating sleeve 212 is the same length as the coating roller 210. A drive motor for driving the coating roller 210 to rotate is installed on the side of the frame 100 away from the telescopic tube 220, and the two coating rollers 210 rotate in opposite directions. The coating sleeve 212 is made of porous ceramic or silicone material, and its surface has a uniformly distributed micro-protrusion structure. The distance between adjacent glue outlets 211 gradually decreases from the side closer to the telescopic tube 220 to the side farther from the glue tank 222. The outer wall of the glue delivery tube 221 is covered with a heating layer, which is electrically connected to the temperature control system inside the glue tank 222.

[0029] In this embodiment, the substrate, such as a PET film, passes through the central channel of the frame 100, and the upper and lower functional films, such as optical films / ceramic films, are simultaneously introduced from the upper and lower sides of the substrate. The adhesive in the glue tank 222 is heated to a set temperature by a temperature control system, reaches the telescopic tube 220 through the glue delivery pipe 221, and enters the inner cavity of the coating roller 210. The drive motor drives the two coating rollers 210 to rotate in opposite directions, and the adhesive seeps out from the glue outlet 211. The distance between adjacent glue outlets 211 gradually decreases from the side closer to the telescopic tube 220 to the side farther from the glue tank 222, so that the glue output remains uniform and glue accumulation is avoided. The adhesive passes through the micro-protrusion structure of the porous ceramic coating sleeve 212 to form a uniform adhesive layer with a thickness of 10-50μm on both sides of the substrate. Due to the pressure loss of the adhesive flowing in the inner cavity of the coating roller 210, the glue resistance at the far end is relatively large. By reducing the distance between the far-end holes, the number of dispensing holes 211 per unit length at the far end is increased, thereby compensating for the reduced flow rate caused by pressure loss and ultimately achieving uniform dispensing volume along the length of the roller.

[0030] When the substrate thickness changes, the telescopic rod pushes the sliding block to slide within the groove, automatically adjusting the distance between the coating roller 210 and the substrate. An inlet speed sensor monitors the substrate speed in real time, providing feedback to control the drive motor speed. The speed sensor is a laser tachometer, installed on the frame 100 near the inlet of the coating roller 210 to ensure matching of the coating line speed. A heating layer is provided to prevent low-temperature solidification and pipe blockage. The telescopic tube 220 compensates for pipe deformation during the displacement of the coating roller 210, preventing interruption of glue delivery.

[0031] It should be noted that the frame 100 is equipped with feeding rollers and receiving rollers corresponding to the substrate on both sides, and feeding rollers and receiving rollers corresponding to the film are also provided. The glue tank 222 is equipped with a glue inlet at the top and a stirring mechanism inside to make the glue solution uniform. The glue tank 222 is equipped with a motor at the top to drive the stirring mechanism to rotate, and a pump body for conveying glue solution is installed on the glue tank 222. The pump body is connected to the glue delivery pipe 221.

[0032] like Figure 1 and Figure 3 As shown, the pressing mechanism 300 includes a mounting groove formed on the frame 100. An electric push rod 312 is disposed in the mounting groove. A slider 311 is slidably connected to the telescopic end of the electric push rod 312 within the mounting groove. A pressure roller 310 is rotatably connected to the slider 311. A positioning block is fixedly connected to the telescopic end of the electric push rod 312 and slidably connected to the mounting groove. A spring is fixedly connected between the positioning block and the slider 311.

[0033] In this embodiment, the coated substrate and the upper and lower films initially come into contact under the guidance of guide rollers. The two coating rollers 210 rotate in opposite directions to counteract the film's travel torque and prevent the substrate from skewing. The electric push rod 312 pushes the slider 311 to press the pressure roller 310 against the composite, and the spring absorbs the impact of thickness fluctuations. The pressure roller 310 presses with a pressure of 0.2-0.8 MPa to remove air bubbles and enhance adhesion.

[0034] Working principle: This device achieves precise double-sided synchronous bonding of multi-layer films through four coordinated steps: temperature-controlled glue supply, uniform glue dispensing, reverse rotation coating, and elastic constant pressure. The heated glue supply tube 221 maintains the fluidity of the glue, the glue outlet 211 and the porous ceramic coating sleeve 212 ensure a uniform glue layer without edge effects, the spring-buffered pressure roller 310 provides constant pressure, and the electric push rod 312 achieves precise control of the pressing gap, facilitating film bonding.

[0035] It should be noted that the coating roller 210, telescopic tube 220, pressure roller 310, electric push rod 312 and other components mentioned above are all devices with relatively mature existing technology. The specific model can be selected according to actual needs. At the same time, the electric push rod 312 can be powered by mains power. The specific power supply method can be selected according to the situation, which will not be elaborated here.

[0036] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A bonding device for multilayer films, characterized in that, include: The frame (100) has a substrate that passes through the center of the frame (100), and thin films are provided on the upper and lower sides of the substrate, which also pass through the frame (100). The adhesive application mechanism (200) is mounted on the frame (100) and is used to apply adhesive to the upper and lower sides of the substrate and to bond the substrate and the film together. A pressing mechanism (300) is mounted on a frame (100) to roll the laminated film and substrate. The glue application mechanism (200) includes glue application rollers (210) symmetrically arranged on the frame (100). The glue application rollers (210) are provided with glue outlet holes (211). One end of the glue application rollers (210) is rotatably connected to a telescopic tube (220). A glue delivery tube (221) is fixedly connected to the telescopic tube (220). A glue bucket (222) connected to the glue delivery tube (221) is provided on the frame (100).

2. The bonding apparatus for multilayer films according to claim 1, characterized in that, The frame (100) is symmetrically provided with sliding grooves, and a slider that is rotatably connected to the coating roller (210) is slidably connected in the sliding groove. A telescopic rod connected to the slider is provided in the sliding groove, and the telescopic rod is perpendicular to the axis of the coating roller (210).

3. The bonding apparatus for multilayer films according to claim 1, characterized in that, The surface of the coating roller (210) is fitted with a coating sleeve (212), and the coating sleeve (212) is the same length as the coating roller (210).

4. The bonding apparatus for multilayer films according to claim 2, characterized in that, A drive motor for driving the coating rollers (210) to rotate is installed on the side of the frame (100) away from the telescopic tube (220), and the two coating rollers (210) rotate in opposite directions.

5. The bonding apparatus for multilayer films according to claim 1, characterized in that, The pressing mechanism (300) includes a mounting groove on the frame (100), an electric push rod (312) is provided in the mounting groove, and a slider (311) is slidably connected to the telescopic end of the electric push rod (312) in the mounting groove. A pressure roller (310) is rotatably connected to the slider (311).

6. The bonding apparatus for multilayer films according to claim 5, characterized in that, The telescopic end of the electric push rod (312) is fixedly connected to a positioning block that is slidably connected in the mounting groove, and a spring is fixedly connected between the positioning block and the slider (311).

7. The bonding apparatus for multilayer films according to claim 3, characterized in that, The adhesive sleeve (212) is made of porous ceramic or silicone material, and its surface is provided with uniformly distributed micro-protrusions. The distance between adjacent adhesive outlet holes (211) gradually decreases from the side closer to the telescopic tube (220) to the side farther away from the glue tank (222).

8. The bonding apparatus for multilayer films according to claim 1, characterized in that, The outer wall of the glue delivery pipe (221) is covered with a heating layer, which is electrically connected to the temperature control system inside the glue tank (222).

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