A method for three-layer full lamination of a thermosensitive optical adhesive

Abstract

The present invention belongs to the technical field of thermosensitive optical adhesives, and specifically relates to a method for three-layer full lamination of a thermosensitive optical adhesive. This method for three-layer full lamination of a thermosensitive optical adhesive comprises the following steps: Step 1: Place the glass cover plate at the feeding end of the conveying device by means of a manipulator, and place the OSA adhesive on the cover plate glass during the forward conveying process to form a first OSA adhesive layer; Step 2: Position through a positioning device, and then perform dispensing on the four-side end points of the first OSA adhesive layer and the glass cover plate by means of the first group of dispensing devices arranged on the conveying device to form a first UV adhesive layer connecting the first OSA adhesive layer and the glass cover plate; Step 3: Place the touch film on the first OSA adhesive layer. This method for three-layer full lamination of a thermosensitive optical adhesive has the effects of, through a pipeline-type conveying device, loading, aligning, and fixing the alignment at different positions, successively completing the loading, stacking, alignment, and alignment fixing of five layers of materials, improving the alignment accuracy and lamination efficiency, and also being able to improve the production efficiency and the yield rate.

Description

Technical Field

[0001] The present invention belongs to the technical field of thermosensitive optical adhesives, and particularly relates to a method for three-layer full lamination of a thermosensitive optical adhesive. Background Art

[0002] For a fully laminated touch display screen, it is necessary to sequentially laminate a liquid crystal screen, a touch film, and a cover glass with an optical adhesive. The requirements for lamination accuracy and lamination environment are relatively high. Moreover, five materials, namely a liquid crystal screen, an optical adhesive, a touch film, an optical adhesive, and a cover glass, need to go through four lamination processes to be completed. Multiple processes will greatly reduce production efficiency and production yield. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for three-layer full lamination of a thermosensitive optical adhesive, so as to solve the technical problem that multiple processes will greatly reduce production efficiency and production yield, and achieve the purpose of improving alignment accuracy and lamination efficiency, as well as improving production efficiency and product yield by means of a pipeline-type conveying device for sheet feeding, alignment, and alignment fixation at different positions, and sequentially completing the sheet stacking, alignment, and alignment fixation of five layers of materials.

[0004] To solve the above technical problems, the present invention provides a method for three-layer full lamination of a thermosensitive optical adhesive, including the following steps:

[0005] Step 1: Place the glass cover plate on the feeding end of the conveying device with a manipulator, and place the OSA adhesive on the cover glass during the forward conveying process to form a first OSA adhesive layer;

[0006] Step 2: Position through a positioning device, and then apply glue to the four side endpoints of the first OSA adhesive layer and the glass cover plate through the first set of dispensing devices arranged on the conveying device to form a first UV adhesive layer connecting the first OSA adhesive layer and the glass cover plate;

[0007] Step 3: Place the touch film on the first OSA adhesive layer, and apply glue to the four side endpoints of the first UV adhesive layer and the touch film through the second set of dispensing devices to form a second UV adhesive layer connecting the first UV adhesive layer and the touch film;

[0008] Step 4: Place the second OSA adhesive layer on the touch film, and apply glue to the four side endpoints of the second UV adhesive layer and the second OSA adhesive layer through the third set of dispensing devices to form a third UV adhesive layer connecting the second UV adhesive layer and the second OSA adhesive layer;

[0009] Step 5: Place the liquid crystal screen on the second OSA adhesive layer, and apply glue to the four side endpoints of the third UV adhesive layer and the liquid crystal screen through the fourth set of dispensing devices to form a fourth UV adhesive layer connecting the third UV adhesive layer and the liquid crystal screen;

[0010] Step 6: Place the product in a heating and laminating device to complete lamination;

[0011] Step 7: Remove the first UV glue layer, the second UV glue layer, the third UV glue layer, and the fourth UV glue layer that are attached to the four side endpoints of the product.

[0012] Furthermore, the dispensing device includes a support frame and a slide rail provided on the conveying device. The two feet of the support frame are provided on both sides of the conveying device. A support rod is provided on the slide rail, and a rotatable spray gun and a UV curing lamp are provided on the support rod.

[0013] Furthermore, the heat-bonding device performs vacuum pumping and synchronously raises the temperature for 5 minutes. When the temperature rises to 60-65°C, the first OSA glue layer and the second OSA glue layer start to melt. Then, maintain the temperature of 60-65°C for 5-10 minutes until the first OSA glue layer and the second OSA glue layer are completely melted and are completely bonded to the cover glass, the touch film, and the liquid crystal screen. Then, cool down for 5 minutes to room temperature.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1. Through the pipeline-type conveying device, loading, alignment, and alignment fixation are performed at different positions, and the loading, stacking, alignment, and alignment fixation of five layers of materials are completed in sequence. Then, by using the thermosensitive glue OSA optical glue instead of the OCA optical glue and through the heating method, the five layers of materials are bonded at one time, improving the alignment accuracy and the bonding efficiency.

[0016] 2. After the loading and stacking alignment of every two layers of materials is completed, by dispensing glue at the four side endpoints of the materials, the effect of alignment fixation is achieved, preventing alignment deviation caused by movement during the conveying process.

[0017] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes a detailed description as follows. Description of the Drawings

[0018] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a structural schematic diagram of the product of the method for three-layer full bonding of the thermosensitive optical glue of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the dispensing device of the method for three-layer full bonding of the thermosensitive optical glue of the present invention;

[0021] Figure 3 It is a schematic diagram of the detailed structure of the dispensing device of the present invention.

[0022] In the figure:

[0023] 1. Conveyor device;

[0024] 2. Glass cover plate;

[0025] 3. First OSA glue layer; 31. First UV glue layer;

[0026] 4. Touch film; 41. Second UV glue layer;

[0027] 5. Second OSA glue layer; 51. Third UV glue layer;

[0028] 6. Liquid crystal screen; 61. Fourth UV glue layer;

[0029] 7. Dispensing device; 72. Support frame; 73. Support rod; 74. Spray gun; 75. UV curing lamp; 76. Piezoelectric valve;

[0030] 8. Heating and laminating device. Specific embodiments

[0031] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] Embodiment:

[0033] As Figures 1 to 3As shown in the figure, a method for full lamination of a three-layer thermosensitive optical adhesive includes the following steps: Step 1: Place the glass cover plate 2 at the feeding end of the conveying device 1 with a manipulator, and place the OSA adhesive on the cover plate glass during the forward conveying process to form a first OSA adhesive layer 3; Step 2: Position through the positioning device, and then apply glue to the four-side end points of the first OSA adhesive layer 3 and the glass cover plate 2 through the first set of dispensing devices 7 provided on the conveying device 1 to form a first UV adhesive layer 31 connecting the first OSA adhesive layer 3 and the glass cover plate 2; Step 3: Place the touch film 4 on the first OSA adhesive layer 3, and apply glue to the four-side end points of the first UV adhesive layer 31 and the touch film 4 through the second set of dispensing devices 7 to form a second UV adhesive layer 41 connecting the first UV adhesive layer 31 and the touch film 4; Step 4: Place the second OSA adhesive layer 5 on the touch film, and apply glue to the four-side end points of the second UV adhesive layer 41 and the second OSA adhesive layer 5 through the third set of dispensing devices 7 to form a third UV adhesive layer 51 connecting the second UV adhesive layer 41 and the second OSA adhesive layer 5; Step 5: Place the liquid crystal screen 6 on the second OSA adhesive layer 5, and apply glue to the four-side end points of the third UV adhesive layer 51 and the liquid crystal screen 6 through the fourth set of dispensing devices 7 to form a fourth UV adhesive layer 61 connecting the third UV adhesive layer 51 and the liquid crystal screen 6; Step 6: Place the product in the heating and laminating device 8 to complete the lamination; Step 7: Remove the first UV adhesive layer 31, the second UV adhesive layer 41, the third UV adhesive layer 51, and the fourth UV adhesive layer 61 at the four-side end points of the product. By bonding the superimposed cover plate glass, the first OSA adhesive layer 3, the touch film 4, the second OSA adhesive layer 5, and the liquid crystal screen 6 respectively during the re-conveying process, the situation of offset between the cover plate glass, the first OSA adhesive layer 3, the touch film 4, the second OSA adhesive layer 5, and the liquid crystal screen 6 is reduced.

[0034] Among them, the dispensing device 7 includes two support frames 72 and a slide rail provided on the conveying device 1. The two legs of the two support frames 72 are both provided on both sides of the conveying device 1. A support rod 73 is provided on the slide rail. A rotatable spray gun 74 is provided on the support rod 73 of one of the support frames 72, and a UV curing lamp 75 is provided on the support rod 73 of the other support frame 72. The spray gun 74 sprays UV adhesive on the part where the UV adhesive layer needs to be sprayed. After spraying, the UV adhesive layer is cured by the UV fixing lamp on the other support frame 72. Among them, a piezoelectric valve 76 is provided beside the spray gun 74, and the spraying amount of the spray gun 74 is controlled through the piezoelectric valve 76.

[0035] Among them, the heating and laminating device 8 evacuates the air and synchronously raises the temperature for 5 minutes. When the temperature rises to 60-65 °C, the first OSA adhesive layer 3 and the second OSA adhesive layer 5 start to melt. Then, the temperature of 60-65 °C is maintained for 5-10 minutes until the first OSA adhesive layer 3 and the second OSA adhesive layer 5 are completely melted and are completely laminated with the cover glass, the touch film 4 and the liquid crystal screen 6. Then, the temperature is lowered for 5 minutes to room temperature.

[0036] In summary, through the pipeline conveyor device 1, loading, alignment, and alignment fixation are performed at different positions, and the loading, stacking, alignment, and alignment fixation of the five-layer materials are sequentially completed. Then, by using the thermosensitive adhesive OSA optical adhesive instead of the OCA optical adhesive and through the heating method, the five-layer materials are laminated at one time, improving the alignment accuracy and lamination efficiency. After the loading and stacking alignment of each two-layer material is completed, the effect of alignment fixation is achieved by applying glue at the four side end points of the material, preventing the alignment deviation caused by movement during the conveying process.

[0037] Each device selected in this application is a general standard part or a component known to those skilled in the art. Its structure and principle can be known to those skilled in the art through technical manuals or through conventional experimental methods. In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0038] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is 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, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] Taking the above-mentioned ideal embodiment of the present invention as an inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A method for three-layer full lamination of a thermosensitive optical adhesive, characterized in that, It includes the following steps: Step 1: Place the glass cover plate (2) at the feeding end of the conveying device (1) with a manipulator, and place the OSA glue on the cover plate glass during the forward conveying process to form a first OSA glue layer (3); Step 2: Position through the positioning device, and then use the first group of dispensing devices (7) arranged on the conveying device (1) to dispense glue at the four-side end points of the first OSA glue layer (3) and the glass cover plate (2) to form a first UV glue layer (31) connecting the first OSA glue layer (3) and the glass cover plate (2); Step 3: Place the touch film (4) on the first OSA glue layer (3), and use the second group of dispensing devices (7) to dispense glue at the four-side end points of the first UV glue layer (31) and the touch film (4) to form a second UV glue layer (41) connecting the first UV glue layer (31) and the touch film (4); Step 4: Place the second OSA glue layer (5) on the touch film (4), and use the third group of dispensing devices (7) to dispense glue at the four-side end points of the second UV glue layer (41) and the second OSA glue layer (5) to form a third UV glue layer (51) connecting the second UV glue layer (41) and the second OSA glue layer (5); Step 5: Place the liquid crystal screen (6) on the second OSA glue layer (5), and use the fourth group of dispensing devices (7) to dispense glue at the four-side end points of the third UV glue layer (51) and the liquid crystal screen (6) to form a fourth UV glue layer (61) connecting the third UV glue layer (51) and the liquid crystal screen (6); Step 6: Place the product in the heating and laminating device (8) to complete lamination; Step 7: Remove the first UV glue layer (31), the second UV glue layer (41), the third UV glue layer (51) and the fourth UV glue layer (61) attached to the four-side end points of the product.

2. A method for three-layer full lamination of a thermosensitive optical glue as described in claim 1, characterized in that the dispensing device (7) includes a support frame (72) and a slide rail arranged on the conveying device (1), two feet of the support frame (72) are arranged on both sides of the conveying device (1), a support rod (73) is arranged on the slide rail, and a rotatable spray gun (74) and a UV curing lamp (75) are arranged on the support rod (73).

3. A method for three-layer full lamination of a thermosensitive optical glue as described in claim 2, characterized in that the heating and laminating device (8) evacuates, synchronously raises the temperature for 5 minutes. When the temperature rises to 60 - 65 °C, the first OSA glue layer (3) and the second OSA glue layer (5) start to melt, and then maintain the temperature of 60 - 65 °C for 5 - 10 min. The first OSA glue layer (3) and the second OSA glue layer (5) are completely melted and are completely laminated with the cover plate glass, the touch film (4) and the liquid crystal screen (6), and then the temperature is lowered for 5 min to room temperature.

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