Curing device for oca optical adhesive production

Abstract

The utility model discloses a curing device for OCA optical adhesive production, including the curing box, and the import and export of setting in the both ends of curing box, through the setting of hot -blast curing mechanism and UV curing mechanism, realized double solidification effect, hot -blast curing stage, through the heating wire heating air, even hot blast is transported to optical adhesive surface through the air -blower, can remove the solvent in the glue layer quickly, makes resin molecule preliminary crosslinking, and lays the foundation for subsequent solidification, and UV curing stage, utilizes the specific wavelength ultraviolet of UV curing lamp emission, excites the photo -initiator in the glue layer, and promotes resin molecule depth polymerization, realizes complete solidification, and this double solidification mode is complementary, overcomes the solidification insufficient, solidification depth deficiency etc. of single solidification mode existence's problem, ensures that optical adhesive can reach the ideal solidification state in each level, and the key performance index such as product's bonding strength, weather resistance and light transmittance etc. have been improved significantly.

Description

Technical Field

[0001] This utility model relates to the field of optical adhesive production technology, specifically a curing device for the production of OCA optical adhesive. Background Technology

[0002] OCA optical adhesive is a special adhesive used to bond transparent optical components (such as displays, touch screens, etc.). It has excellent properties such as high transparency, high bonding strength, and good weather resistance. It is widely used in many fields such as consumer electronics, automotive displays, and smart wearables. In the production process of OCA optical adhesive, the curing process is a crucial step. Its curing effect directly affects the final performance of the optical adhesive, such as adhesion, light transmittance, and aging resistance, and thus determines its application quality and stability in downstream products.

[0003] Currently, some curing devices for OCA optical adhesive production on the market, although employing either hot air curing or UV curing, cannot effectively solve the problems inherent in a single curing method. Hot air curing has a relatively slow heating rate, resulting in a long curing cycle and low production efficiency, making it difficult to meet the high-volume demands of large-scale industrial production. UV curing has significant advantages in terms of fast curing speed and high efficiency, but for certain OCA optical adhesive formulations, relying solely on UV curing may not achieve the ideal curing depth and performance of the adhesive layer. This is because as UV light penetrates the adhesive layer, the light intensity gradually decreases with increasing depth, causing the adhesive layer to not fully absorb ultraviolet energy, resulting in incomplete curing. Therefore, we need to propose a curing device for OCA optical adhesive production. Utility Model Content

[0004] The purpose of this invention is to provide a curing device for the production of OCA optical adhesive, which achieves a dual curing effect through the cooperation of a hot air curing mechanism and a UV curing mechanism, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] The curing apparatus for the production of OCA optical adhesive includes a curing chamber and inlets and outlets at both ends of the curing chamber.

[0007] Several sets of conveyor rollers are mounted on the inner walls of both sides of the curing chamber at equal intervals via bearings;

[0008] Two sets of limiting mechanisms are symmetrically installed on the top of both ends of the curing box to limit the movement of the optical adhesive when it is being conveyed by the conveyor rollers;

[0009] The hot air curing mechanism, installed on top of the curing chamber, is used to cure the optical adhesive conveyed on the conveyor rollers with hot air.

[0010] The UV curing unit, installed on top of the curing chamber, is used to assist in the curing of optical adhesives after hot air curing.

[0011] Preferably, the hot air curing mechanism includes a heating box, which is fixedly installed on one side wall of the curing chamber. Two sets of heating wires are fixedly installed inside the heating box. The air inlet of the heating box is fixedly connected to a blower, and the air outlet is fixedly connected to an air supply hood through a pipe. The bottom of the air supply hood penetrates the curing chamber and is fixedly connected to an air distribution shell.

[0012] Preferably, the opening at the bottom of the air distribution shell is located directly above the optical adhesive, and the bottom of the air distribution shell is provided with a mesh cover for uniform airflow.

[0013] Preferably, the UV curing mechanism includes a mounting shell, which is installed through the top of the curing chamber. A UV curing lamp is fixedly installed inside the lower part of the mounting shell, and several sets of heat dissipation fins are fixedly installed on the top of the UV curing lamp.

[0014] Preferably, a cooling fan is fixedly installed on the top of the mounting housing, and the air outlet of the cooling fan is located directly above the heat dissipation fins.

[0015] Preferably, the limiting mechanism includes an electric push rod, which is fixedly installed on the top of the curing chamber. The bottom of the telescopic end of the electric push rod passes through the curing chamber and is fixedly installed with an installation plate. An installation frame is fixedly installed on the bottom of the installation plate. A limiting roller is rotatably installed inside the installation frame through a bearing, and the limiting roller is located directly above the conveying roller at the corresponding position at the end of the curing chamber.

[0016] Preferably, the curing box is slidably connected to limit rods on both sides of the electric push rod, and the bottom of both sets of limit rods is fixedly installed to the top of the mounting plate.

[0017] Preferably, the tops of several sets of conveying rollers are all on the same horizontal line as the inner bottoms of the two sets of inlet and outlet.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] This invention achieves a dual curing effect through the combination of a hot air curing mechanism and a UV curing mechanism. In the hot air curing stage, air is heated by a heating wire and then delivered evenly to the surface of the optical adhesive by a blower. This quickly removes the solvent from the adhesive layer, causing the resin molecules to initially cross-link, laying the foundation for subsequent curing. In the UV curing stage, a specific wavelength of ultraviolet light emitted by a UV curing lamp excites the photoinitiator in the adhesive layer, promoting deep polymerization of the resin molecules and achieving complete curing. This dual curing method complements each other, overcoming the problems of insufficient curing and insufficient curing depth that exist in single curing methods. It ensures that the optical adhesive achieves an ideal curing state at all levels, significantly improving the product's key performance indicators such as bonding strength, weather resistance, and light transmittance. Attached Figure Description

[0020] Figure 1 This is a side view of the three-dimensional structure of the present invention;

[0021] Figure 2 This is a cross-sectional structural diagram of the curing box of this utility model;

[0022] Figure 3 This is a schematic diagram of the hot air curing mechanism of this utility model;

[0023] Figure 4 This is a schematic diagram of the UV curing mechanism of this utility model;

[0024] Figure 5 This is a schematic diagram of the limiting mechanism of this utility model.

[0025] In the diagram: 1. Curing chamber; 2. Inlet / outlet; 3. Conveyor roller; 4. Limiting mechanism; 41. Electric push rod; 42. Mounting plate; 43. Mounting frame; 44. Limiting roller; 45. Limiting rod; 5. Hot air curing mechanism; 51. Heating box; 52. Heating wire; 53. Blower; 54. Air supply hood; 55. Air distribution shell; 6. UV curing mechanism; 61. Mounting shell; 62. UV curing lamp; 63. Heat dissipation fins; 64. Cooling fan. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1-5 This utility model provides a technical solution:

[0028] The curing apparatus for the production of OCA optical adhesive includes a curing chamber 1 and inlet / outlet 2 at both ends of the curing chamber 1.

[0029] Several sets of conveyor rollers 3 are mounted on the inner walls of both sides of the curing box 1 at equal intervals via bearings;

[0030] The curing chamber 1 has a closed structure, which can reduce the interference of external dust and temperature fluctuations on the curing process. The inlet and outlet 2 at both ends adopt a rectangular opening design that is adapted to the width of the optical adhesive, which not only facilitates the entry and exit of materials, but also reduces heat loss inside the chamber, provides a stable curing environment, reduces the impact of external factors on the performance of the optical adhesive, and reduces energy consumption. The conveying roller 3 is made of high temperature resistant and smooth stainless steel, and the bearing is a high-precision sealed bearing, which can prevent lubricant leakage and contamination of the optical adhesive. The equidistant distribution design ensures that the optical adhesive is subjected to uniform force during the conveying process, avoiding wrinkles or stretching deformation.

[0031] Two sets of limiting mechanisms 4 are symmetrically installed on the top of both ends of the curing box 1 to limit the movement of the optical adhesive when it is conveyed by the conveying roller 3;

[0032] The hot air curing mechanism 5 is installed on the top of the curing box 1 and is used to hot air cure the optical adhesive conveyed on the conveying roller 3.

[0033] The UV curing unit 6 is installed on top of the curing chamber 1 and is used to assist in the curing of the optical adhesive after hot air curing.

[0034] In an optional embodiment: the hot air curing mechanism 5 includes a heating box 51, which is fixedly installed on one side wall of the curing chamber 1. Two sets of heating wires 52 are fixedly installed inside the heating box 51. The air inlet of the heating box 51 is fixedly connected to a blower 53, and the air outlet is fixedly connected to an air supply hood 54 through a pipe. The bottom of the air supply hood 54 penetrates the curing chamber 1 and is fixedly connected to an air distribution shell 55.

[0035] It should be noted that the heating box 51 is made of heat-insulating material, which can reduce heat loss to the outside. The two sets of heating wires 52 are symmetrically distributed, which can make the air inside the heating box 51 more evenly heated. Different power can be adjusted independently, resulting in high heating efficiency and flexible temperature adjustment to meet the curing needs of optical adhesives of different thicknesses. The blower 53 is an adjustable speed fan, which can adjust the air volume according to the curing requirements. A filter screen is installed at the air inlet to filter impurities in the air, avoid contaminating the heated air, ensure a stable supply of hot air, and reduce the impact of impurities on the transparency of the optical adhesive. The air supply hood 54 adopts a streamlined airflow guiding structure inside, which can reduce wind resistance and make the airflow evenly transition. The pipe is made of heat-insulating material to prevent the temperature of the hot air from dropping during the transportation process. The air distribution shell 55 has multiple sets of guide plates inside, which can disperse the concentrated airflow into a uniform surface airflow. Its bottom opening width is adapted to the optical adhesive transportation width to ensure that the hot air can fully cover the surface of the optical adhesive, achieve uniform distribution of hot air, avoid local over- or under-curing of the optical adhesive, and improve the consistency of curing quality.

[0036] In an optional embodiment: the opening at the bottom of the air distribution shell 55 is located directly above the optical adhesive, and the bottom of the air distribution shell 55 is provided with a mesh cover for uniform airflow.

[0037] It should be noted that the top-mounted design allows the hot air to act vertically on the surface of the optical adhesive, reducing the impact of wind on the adhesive. The mesh cover uses a fine-mesh metal mesh, which can further homogenize the airflow and prevent foreign objects from falling and contaminating the optical adhesive. The hot air acts more directly, further improving the uniformity of airflow, while also providing protection.

[0038] In an optional embodiment: the UV curing mechanism 6 includes a mounting shell 61, which is installed through the top of the curing chamber 1. A UV curing lamp 62 is fixedly installed inside the lower part of the mounting shell 61, and a number of heat dissipation fins 63 are fixedly installed on the top of the UV curing lamp 62.

[0039] It should be noted that the mounting housing 61 is made of light-shielding material to prevent ultraviolet leakage and damage to operators. The through-type installation ensures a fixed distance between the UV curing lamp 62 and the optical adhesive, ensuring stable light intensity, high safety, and stable and controllable curing parameters. The UV curing lamp 62 uses a special lamp tube with wavelength matching the photosensitive characteristics of OCA optical adhesive. Multiple sets of lamp tubes are distributed in parallel, covering the entire width of the optical adhesive. The fixed installation method avoids light deviation caused by vibration, resulting in high light energy utilization, uniform curing effect, and strong equipment operation stability. The heat dissipation fins 63 are made of high thermal conductivity aluminum alloy and are radially distributed. They can quickly absorb the heat generated by the UV curing lamp 62 during operation and expand the heat dissipation area, preventing the lamp tube from aging due to high temperature, extending the service life of the UV curing lamp 62, and ensuring stable luminous efficiency.

[0040] In an optional embodiment, a cooling fan 64 is fixedly mounted on the top of the mounting housing 61, and the air outlet of the cooling fan 64 is located directly above the heat dissipation fins 63.

[0041] It should be noted that the cooling fan 64 generates directional airflow that blows directly onto the heat dissipation fins 63, accelerating heat dissipation. The fan speed can be automatically adjusted according to the lamp temperature, resulting in high heat dissipation efficiency. This maintains the UV curing lamp 62 at its optimal operating temperature, ensuring stable curing results.

[0042] In an optional embodiment: the limiting mechanism 4 includes an electric push rod 41, which is fixedly installed on the top of the curing chamber 1. The bottom of the telescopic end of the electric push rod 41 passes through the curing chamber 1 and is fixedly installed on an installation plate 42. An installation frame 43 is fixedly installed on the bottom of the installation plate 42. A limiting roller 44 is rotatably installed inside the installation frame 43 through a bearing, and the limiting roller 44 is located directly above the conveying roller 3 at the corresponding position at the end of the curing chamber 1.

[0043] It should be noted that the electric push rod 41 adopts high-precision servo control, which can realize stepless adjustment of the limit height. The top installation method does not occupy the internal space of the curing box 1, which is convenient for maintenance. The adjustment accuracy is high, which can adapt to the limit requirements of optical adhesives of different thicknesses. The operation is convenient. The mounting plate 42 is made of rigid metal plate, which can ensure the installation stability of the limit roller 44. The fixed connection with the telescopic end of the electric push rod 41 adopts an anti-loosening structure to avoid loosening after long-term use. The structure is stable and the limit accuracy is not easily affected by vibration. The mounting bracket 43 is a U-shaped structure with an opening size that matches the limit roller 44. It is fixed to the mounting plate 42 by welding or bolt connection to ensure connection strength and withstand the pressure of the limit roller 44 during operation. The surface of the limit roller 44 is coated with Teflon, which is both smooth and heat resistant. It forms an upper and lower clamping structure with the conveying roller 3. The rotation design can reduce friction between it and the optical adhesive, avoid scratching the surface, and ensure good limit effect without damaging the surface of the optical adhesive, ensuring smooth conveying.

[0044] In an optional embodiment: the curing box 1 is slidably inserted with limit rods 45 on both sides of the electric push rod 41, and the bottom of both sets of limit rods 45 are fixedly installed with the top of the mounting plate 42.

[0045] It should be noted that the limiting rod 45 adopts a high-precision optical axis and is equipped with a linear bearing at the insertion point with the curing box 1. It can move up and down synchronously with the mounting plate 42, limit the lateral displacement of the mounting plate 42, improve the operating stability of the limiting mechanism 4, avoid tilting when the mounting plate 42 is raised and lowered, and ensure the parallelism between the limiting roller 44 and the conveying roller 3.

[0046] In an optional embodiment: the tops of several sets of conveyor rollers 3 are all on the same horizontal line as the inner bottom of the two sets of inlet and outlet rollers 2.

[0047] It should be noted that this horizontal design keeps the optical adhesive flat during entry, transport, and exit of the curing chamber 1, avoiding bending or stretching caused by height differences, reducing deformation of the optical adhesive during transport, and ensuring dimensional accuracy and flatness after curing.

[0048] Working principle: When using this utility model, the OCA optical adhesive roll enters from the inlet / outlet 2 at one end of the curing chamber 1 and extends out from the other end of the inlet / outlet 2 to connect with the external winding equipment. At this time, the limiting mechanism 4 at the inlet is activated, and the electric push rod 41 extends and retracts according to the thickness of the optical adhesive, driving the mounting plate 42 and the limiting roller 44 to descend, forming a clamping structure with the conveying roller 3 below (the limiting rods 45 on both sides ensure that the limiting roller rises and falls vertically to avoid tilting). The limiting roller 44 rotates synchronously with the conveying roller 3, and the lateral displacement of the optical adhesive is limited by the upper and lower clamping, ensuring that it enters the curing chamber in a straight line.

[0049] After the optical adhesive enters the curing chamber 1, it first passes through the hot air curing mechanism 5: the blower 53 sends filtered air into the heating box 51, and the two sets of heating wires 52 generate heat to heat the air to the set temperature (the heat insulation design of the heating box 51 reduces heat loss). The hot air is then introduced into the air distribution shell 55 through the air supply hood 54 (the streamlined structure reduces wind resistance). The internal guide plate disperses the airflow into a uniform surface, and finally blows it vertically onto the surface of the optical adhesive through the bottom mesh cover. The hot air fully covers the optical adhesive, and the solvent in the adhesive layer evaporates and initially cross-links through heat conduction, completing the pre-curing (the uniform air distribution design avoids local overheating that could cause bubbling or uneven shrinkage of the adhesive layer).

[0050] The pre-cured optical adhesive is transported to the UV curing unit 6 for secondary curing: the UV curing lamp 62 inside the mounting housing 61 is activated, emitting ultraviolet light of a specific wavelength (matching the photosensitive component of the optical adhesive), which promotes deep cross-linking of the adhesive layer molecules through photochemical reaction, thereby improving the bonding strength. At the same time, the heat generated by the UV lamp is absorbed by the top heat dissipation fins 63 (made of aluminum alloy with high thermal conductivity), and the cooling fan 64 blows air in a directional manner to accelerate heat dissipation, ensuring that the lamp works at the optimal temperature (avoiding high temperature from causing lamp aging or a decrease in luminous efficiency).

[0051] The optical adhesive that has undergone double curing is transported to the outlet of the inlet / outlet 2 at one end of the curing chamber 1. The limiting mechanism 4 at the outlet calibrates it again to ensure that it remains flat during output. Finally, the external winding device winds up the cured optical adhesive.

[0052] The control method in this application is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art and is common knowledge in the field. Furthermore, since this application is mainly used to protect the structure and shape and their combination, the control method and circuit connection will not be explained in detail in this application.

[0053] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A curing device for OCA optical adhesive production, characterized in that, It include solidification box (1), and open in solidification box (1) both ends of import and export (2); Several groups of conveying rollers (3) are equidistantly rotatably installed on the inner walls of the two sides of the solidification box (1) through bearings; Two groups of limiting mechanisms (4) are symmetrically installed on the top of the two ends of the solidification box (1) and are used for limiting the optical glue when cooperating with the conveying rollers (3) to convey the optical glue; The hot air curing mechanism (5) is installed on the top of the solidification box (1) and is used for hot air curing the optical glue conveyed on the conveying rollers (3); The UV curing mechanism (6) is installed on the top of the solidification box (1) and is used for assisting curing the optical glue after hot air curing.

2. The curing apparatus for OCA optical adhesive production according to claim 1, characterized in that: The hot air curing mechanism (5) includes a heating box (51) fixedly installed on one side wall of the solidification box (1), two groups of heating wires (52) fixedly installed in the heating box (51), a blower (53) fixedly communicated with the air inlet of the heating box (51), an air supply cover (54) fixedly communicated with the air outlet through a pipeline, and an air uniformizing shell (55) fixedly communicated with the bottom of the air supply cover (54) and penetrating through the solidification box (1). 3.The curing device for OCA optical adhesive production of claim 2, characterized in that: The bottom of the air uniformizing shell (55) is located directly above the optical glue, and the bottom of the air uniformizing shell (55) is provided with a mesh cover for uniformly discharging air. 4.The curing device for OCA optical adhesive production of claim 1, characterized in that: The UV curing mechanism (6) includes a mounting shell (61) penetrating through the top of the solidification box (1), a UV curing lamp (62) fixedly installed inside and below the mounting shell (61), and several groups of heat dissipation fins (63) fixedly installed on the top of the UV curing lamp (62). 5.The curing device for OCA optical adhesive production of claim 4, characterized in that: A heat dissipation fan (64) is fixedly installed on the top of the mounting shell (61), and the air outlet of the heat dissipation fan (64) is located directly above the heat dissipation fins (63). 6.The curing device for OCA optical adhesive production of claim 1, characterized in that: The limiting mechanism (4) includes an electric push rod (41) fixedly installed on the top of the solidification box (1), an installation plate (42) fixedly installed on the bottom of the retractable end of the electric push rod (41), an installation frame (43) fixedly installed on the bottom of the installation plate (42), a limiting roller (44) rotatably installed in the installation frame (43) through a bearing, and the limiting roller (44) located directly above the conveying roller (3) at the corresponding position of the end of the solidification box (1).

7. The curing device for OCA optical adhesive production according to claim 6, characterized in that: The solidification box (1) is slidably connected with a limiting rod (45) on both sides of the electric push rod (41), and the bottom of the two groups of limiting rods (45) is fixedly installed on the top of the installation plate (42). 8.The curing device for OCA optical adhesive production of claim 1, characterized in that: The top of the several groups of conveying rollers (3) is located on the same horizontal line with the inner bottom of the two groups of import and export (2).

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