Screen laminating method

Abstract

The invention discloses a screen laminating method, which comprises the following steps of: 1) performing PET (polyethylene terephthalate) and OCA (optical clear adhesive) primary laminating to form PWO (PWO); and 2) PWO + UTG secondary lamination: aiming at the lamination of the existing overflowed OCA colloid, the method can effectively protect the overflowed OCA colloid from being exposed and does not influence the performance of the OCA colloid, that is, the overflowed colloid can still be normally used after the non-adhesive protective film is torn off, the performance level of subsequent processing is met, and the production cost is reduced. The gluing apparent performance of the overflowed colloid is greatly improved, good gluing of the colloid and the glass is ensured, and the overflowed colloid part is also protected.

Description

Technical Field

[0001] The present invention belongs to the technical field of display screens, and particularly relates to a screen bonding method. Background Art

[0002] In the process of implementing the present invention, the inventors found that the prior art has at least the following problems:

[0003] With the increasing requirements for the display effect and quality of the screen, the full lamination process has gradually been widely used. It uses glue or OCA glue to bond components such as glass, touch panels, and display screens. The advantages are good sealing performance, which can completely extrude impurities such as air. In terms of imaging effect, especially when the screen is black, it shows darker, clearer, and more delicate. This three-in-one method of bonding the film material and glass through the OCA colloid improves the clarity and light transmittance of the screen, and at the same time protects the glass body. Even when the glass is broken, there will be no splashing debris that may damage other components or increase the cleaning and maintenance costs.

[0004] However, this process also has some deficiencies. For example, the cost of the glue or adhesive tape used is relatively high. Moreover, during the lamination process, if the glue is unevenly coated, the lamination force is uneven, or the degassing is incomplete, problems such as bubbles and thickness differences are likely to occur, affecting the display effect of the screen. At the same time, abnormal phenomena such as glue pulling and glue overflow may also occur, having an adverse impact on the appearance and performance of the screen. Due to product updates and iterations, when bonding with the requirement that the colloid size is larger than the glass outer shape size and there is colloid overflow, when bonding with colloid overflow, it will cause the colloid to deform, glue pulling, and missing, and the film material and glass are not closely bonded to form a bubble band, resulting in defective products that cannot meet the usage requirement level. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a screen bonding method to solve the problems of glue pulling and missing of the colloid during the bonding of the overflowing colloid, and to ensure that there are no bubbles between the colloid and the two objects to be bonded, so that the bonding appearance of the film material and the glass is clear and transparent, meeting the usage requirements and performance levels of the product.

[0006] To solve the above technical problem, the technical solution adopted by the present invention is: a screen bonding method, including the following steps:

[0007] 1) PET + OCA one-time lamination to form PWO;

[0008] 2) PWO + UTG secondary lamination.

[0009] In the above step 1), the lamination parameters are: the speed of the lamination roller is 30 - 150 m / s, the lamination height is 13 - 15 mm, and the vacuum pressure of the mesh box is 0.3 - 0.5 Mpa.

[0010] In the above step (2), the surface of the UTG is an outwardly expanding adhesive-free protective film.

[0011] In the above step (2), the adhesive-free protective film extends 0.5 - 1.0 mm outward relative to the edge of the UTG size.

[0012] In the above step (2), the laser cutting machine is used to cut the heavy film surface - adhesive-free protective film of the UTG. The cutting position extends 0 - 0.5 mm outward relative to the edge of the UTG size, and only cuts through the heavy film.

[0013] In the above step (2), the laser cutting parameters of the laser cutting machine are: layer parameters 8 - 30, laser energy 40% - 80%, and cutting speed 800 - 1500 mm / s.

[0014] In the above step (2), when attaching the PWO to the UTG, first tear off the inner film of the heavy film on the cut UTG surface; then clean the UTG.

[0015] In the above step (2), after the UTG is cleaned, tear off the outer film of the cut heavy film, and then attach the UTG to the PWO.

[0016] In the above step (2), the attachment parameters of the UTG and the PWO are: attachment roller speed 30 - 300 mm / s, attachment height 13 - 15 mm, and mesh box vacuum pressure 0.3 - 0.5 Mpa.

[0017] One of the technical solutions in the above technical solution has the following advantages or beneficial effects: it solves the problems of glue pulling and missing of the glue during the attachment of the overflowing colloid, and ensures that there are no bubbles between the colloid and the two objects to be attached, making the attachment appearance of the film material and the glass clear and translucent, meeting the product use requirements and performance levels. Description of the Drawings

[0018] Figure 1 It is the schematic diagram of the screen attachment method provided in the embodiment of the present invention; Detailed Embodiments

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] Embodiment 1

[0021] See Figure 1, A screen lamination method, comprising the following steps: 1) PET+OCA is laminated once to form PWO; 2) PWO+UTG is laminated twice. This solves the problems of glue pulling and missing during the lamination of overflowing colloid, and ensures that there are no bubbles between the colloid and the two objects to be laminated, making the lamination appearance of the film material and the glass clear and translucent, meeting the product use requirements and performance standards. PET is the film material; OCA is the optical transparent adhesive; PWO is the two-in-one lamination structure of PET laminated with OCA. UTG is the glass, which is used to laminate with PWO to form the final three-in-one, that is, the finished product.

[0022] In the above step 1), the lamination parameters are: the speed of the lamination roller is 30-150m / s, the lamination height is 13-15mm, and the vacuum pressure of the mesh box is 0.3-0.5Mpa. The lamination under these parameters will make the lamination surface of PET and OCA smooth and flat, without bubbles and glue pulling, etc., ensuring the product performance and appearance.

[0023] In the above step 2), the surface of UTG is an outward-extended non-adhesive protective film. The non-adhesive protective film extends 0.5-1.0mm outward relative to the edge of the UTG size. Replacing the original light film of UTG with an outward-extended non-adhesive protective film makes it impossible to cause OCA glue pulling and poor appearance when UTG is laminated with OCA, and the size of the non-adhesive protective film should extend 0.5-1.0mm outward relative to the UTG size.

[0024] In the above step 2), the heavy film surface - non-adhesive protective film of UTG is cut by a laser cutting machine. The cutting position extends 0-0.5mm outward relative to the edge of the UTG size, and only the heavy film is cut through. Laser cutting machine cutting parameters: layer parameters 8-30, laser energy 40%-80%, cutting speed 800-1500mm / s. These parameters ensure that only the heavy film is cut through during the cutting process and the non-adhesive protective film is not cut, and the heavy film still covers the non-adhesive layer to protect the non-adhesive layer from being contaminated and damaged. Because the non-adhesive layer of the non-adhesive protective film contains silicone oil and has a non-sticky property but it cannot contact plasma, and UTG needs plasma to be cleaned when laminating with OCA, so a protective film needs to be attached to the non-adhesive layer when the glass is treated with plasma, that is, the semi-cut heavy film.

[0025] In the above step 2), when laminating PWO and UTG, first tear off the inner film of the heavy film on the surface of the cut UTG; then clean the UTG. This protects the non-adhesive layer of the non-adhesive protective film from being cleaned, and also makes the surface of UTG cleaned, ensuring the performance requirements of no foreign matter and water contact angle during lamination. The heavy film of UTG is equivalent to being cut in a circle. The film on the surface is the inner film (the film inside the cutting circle), and the outer film is outside the cutting circle.

[0026] In the above step 2), after cleaning the UTG, remove the outer film of the heavy film after cutting, and then bond the UTG to the PWO. The bonding parameters of the UTG and the PWO are as follows: the speed of the bonding roller is 30 - 300 mm / s, the bonding height is 13 - 15 mm, and the vacuum pressure of the mesh box is 0.3 - 0.5 Mpa. After bonding, the OCA corresponding to the size of the UTG is exposed without a glue protective film, and the non-glue surface will not adhere to the OCA to cause glue pulling, ensuring that the performance of the product remains good.

[0027] When there is a requirement for glue overflow, the film material and the screen glass can still be normally bonded, and there are no bubbles, glue pulling, or incomplete situations on the surface of the overflowed glue after bonding, ensuring the use performance of the product, the light transmittance, and the clarity of the screen.

[0028] The traditional bonding method only requires that the incoming heavy film of the UTG has support and does not adhere to the OCA after bonding with the PWO. However, ordinary film materials cannot meet this requirement, and special film materials will cause difficulties such as increased costs. When bonding with the PWO, first remove the inner glass protective film of the circumcision, and then clean the glass surface. Due to the existence of the outer-expanded glass protective film, the non-glue layer of the non-glue protective film is protected from being removed due to the cleaning of the glass, ensuring that the non-glue layer can contact the overflowed OCA colloid during bonding. Then, remove the outer glass protective film of the circumcision and perform bonding.

[0029] Compared with the traditional bonding method, there is no specified requirement for the incoming film material of the UTG. After simply removing the light film, the UTG is cleaned and then bonded. For this method, the size requirement for the OCA is that the OCA size is less than or equal to the UTG size to ensure that the appearance and performance of the OCA will not be affected.

[0030] Example Two

[0031] A screen bonding method includes the following steps: First step: First, perform normal operation of the first bonding of PET + OCA. Secondly, the non-bonding surface of the UTG passes through the bonding machine. The main bonding parameters are: the speed of the bonding roller is 30 - 150 m / s, the bonding height is 13 - 15 mm, and the vacuum pressure of the mesh box is 0.3 - 0.5 Mpa. Replace the original light film of the UTG with an outer-expanded non-glue protective film so that no OCA glue pulling and poor appearance will occur when the UTG is bonded to the OCA. The size of the non-glue protective film should be 0.5 - 1.0 mm larger than the UTG size.

[0032] Step 2: Use a laser cutting machine to cut the heavy film surface (non-adhesive protective film) of UTG with a size of 0-0.5mm relative to the outer contour of the UTG size, and only cut through the heavy film. The main cutting parameters are: layer parameter 8-30, laser energy 40%-80%, and cutting speed 800-1500mm / s. Because the non-adhesive layer of the non-adhesive protective film has silicone oil with non-stick properties but cannot contact plasma, and UTG needs plasma to clean when it is attached to OCA, it is necessary to attach a protective film to the non-adhesive layer when the glass is plasma-cut, that is, the half-cut heavy film.

[0033] When there is a requirement for colloid overflow, the film material and the screen glass can still be bonded normally, and there will be no bubbles, glue pulling, or defects on the surface of the overflowed colloid after bonding, thus ensuring the product's performance, the screen's light transmittance, and clarity.

[0034] The traditional bonding method only requires that the incoming heavy film of UTG has support and does not stick to OCA after bonding with PWO, but ordinary film materials cannot meet this requirement, and special film materials will cause difficulties such as increased costs. When bonding with PWO, first remove the ring-cut inner glass protective film, and then clean the glass surface. Due to the existence of the outward-expanding glass protective film, the non-glue layer of the non-glue protective film is protected and will not be removed due to the cleaning of the glass, ensuring that the non-glue layer can contact the overflowed OCA colloid during bonding, and then remove the ring-cut outer glass protective film before bonding.

[0035] Compared with the traditional lamination method, there is no specific requirement for the incoming film material of UTG. Only after the light film is torn off, the UTG is cleaned and then laminated. This method requires the size of OCA to be less than or equal to the size of UTG to ensure that the appearance and performance of OCA will not be affected.

[0036] The key point of this method is that after the overflowed colloid contacts the bonding film, the film will be torn off and the glue will be pulled, deformed, or missing. The difficulty of performance guarantee has been successfully overcome. The contact between the non-glue protective layer and the OCA colloid will not pull the glue, and the colloid will not be missing after the film is torn off. In addition, when the glass itself is plasma treated, there is also a protective film, which will not make the non-glue layer invalid. While effectively protecting the appearance of the bonding, it also protects the performance of the overflowed colloid.

[0037] This method can effectively protect the overflowed part of OCA colloid from being exposed, and does not affect the performance of the OCA colloid itself, that is, the overflowed colloid can still be used normally after tearing off the non-glue protective film, meeting the performance level of subsequent processing, greatly improving the bonding appearance performance of the overflowed colloid, ensuring good bonding between the colloid and the glass, and protecting the overflowed colloid part.

[0038] After adopting the above solution, the problems of glue pulling and missing during the bonding of overflow glue are solved, and there are no air bubbles between the glue and the two objects to be bonded, making the bonding appearance of the film material and the glass clear and transparent, meeting the product usage requirements and performance levels.

[0039] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. are based on the orientation or positional relationships shown in the drawings, and 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, and therefore should not be construed as a limitation to the present invention.

[0040] In the present invention, unless otherwise clearly defined and limited, the terms "installation", "setting", "connection", "fixation", "swivel connection", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; 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 internal communication of two components or the interaction relationship between two components. Unless otherwise clearly defined, 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 circumstances.

[0041] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A screen lamination method, characterized in that, It includes the following steps: 1) Conduct a one-time lamination of PET + OCA to form PWO; 2) Conduct a secondary lamination of PWO + UTG.

2. The screen bonding method according to claim 1, wherein In the above step 1), the lamination parameters are: the speed of the lamination roller is 30 - 150 m / s, the lamination height is 13 - 15 mm, and the vacuum pressure of the mesh box is 0.3 - 0.5 Mpa.

3. The screen bonding method according to claim 2, characterized in that In the above step 2), the surface of the UTG is an outward-expanded adhesive-free protective film.

4. The screen bonding method according to claim 3, wherein In the above step 2), the adhesive-free protective film extends 0.5 - 1.0 mm outward relative to the edge of the UTG size.

5. The screen bonding method according to claim 4, characterized in that, In the above step 2), the heavy film surface - adhesive-free protective film of the UTG is cut by a laser cutting machine, and the cutting position extends 0 - 0.5 mm outward relative to the edge of the UTG size, and only the heavy film is cut through.

6. The screen bonding method according to claim 5, wherein In the above step 2), the cutting parameters of the laser cutting machine are: the layer parameters are 8 - 30, the laser energy is 40% - 80%, and the cutting speed is 800 - 1500 mm / s.

7. The screen laminating method according to claim 6, wherein, In the above step 2), when laminating PWO and UTG, first tear off the inner film of the heavy film on the cut UTG surface; then clean the UTG.

8. The screen bonding method according to claim 7, wherein In the above step 2), after the UTG is cleaned, tear off the outer film of the cut heavy film, and then laminate the UTG and PWO.

9. The screen bonding method according to claim 8, characterized in that, In the above step 2), the lamination parameters of the UTG and PWO are: the speed of the lamination roller is 30 - 300 mm / s, the lamination height is 13 - 15 mm, and the vacuum pressure of the mesh box is 0.3 - 0.5 Mpa.

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