Polarizing plate attaching apparatus and attaching process

Abstract

The present application belongs to the technical field of plastic material forming, and particularly relates to plastic material pasting, and more particularly to a polarizing plate pasting device and a pasting process. One of the polarizing plate pasting devices comprises: a conveying belt arranged on one side of a workbench and used to drive a supporting table to move horizontally; a film pressing assembly hinged to a side wall of the workbench and used to press the polarizing plate; a collecting film having a collecting groove formed on its upper surface and initially folded into a double-layer structure so that the collecting groove is close to the edge of the liquid crystal plate; a pressure-sensitive adhesive layer arranged on the free end of the collecting film and used to adhere to the film pressing assembly; and a pasting robot arranged above the conveying belt and used to negatively adsorb the polarizing plate. After the polarizing plate is pasted on the liquid crystal plate, the supporting table moves horizontally relative to the film pressing assembly. The film pressing assembly moves on the surface of the polarizing plate and presses the polarizing plate so that the overflowing glue flows to the collecting groove. When the film pressing assembly moves to the free end of the collecting film, the film pressing assembly is adhered to the free end of the collecting film, the collecting film is pulled to be unfolded into a flat state and away from the liquid crystal plate.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of forming of plastic materials, and particularly relates to the pasting of plastic materials, and especially to a polarizing plate pasting device and a pasting process. BACKGROUND

[0002] In the related art, a polarizing plate needs to be permanently bonded with a liquid crystal plate by pressure-sensitive adhesive to ensure optical bonding without air bubbles, moisture resistance, impact resistance, and fixation of the polarizing angle.

[0003] In the pressing process, in order to uniformly distribute the adhesive layer and exclude air bubbles (if the amount of glue is insufficient, air bubbles will be caused), the pressure will cause the pressure-sensitive adhesive to flow, so that the glue is extruded to the edge (i.e., edge overflow). The overflowed glue will flow and accumulate on the metal support table (or stage) supporting / pressing the liquid crystal panel. These residual glue will harden in the subsequent production process, stubbornly adhering to the surface of the support table; not only seriously polluting the support table, but also causing local extrusion damage to the subsequently placed liquid crystal panel.

[0004] In the prior art, a frame flow blocking method is usually used, which predefines a non-adhesive flow blocking layer at the edge of the polarizing plate to block the flow of glue; however, the frame flow blocking method needs to increase the cost of photoetching / laser process, and the flow blocking layer may affect the narrow frame design. The role of the flow blocking layer is only to block the glue in the non-visible edge area of the polarizing plate, and it cannot prevent the blocked glue at the edge from continuing to flow outward and downward of the edge of the polarizing plate. Therefore, these blocked glues will still overflow to the surface of the support table, causing the above-mentioned serious pollution and equipment damage problems.

[0005] Therefore, during the pressing process of the polarizing plate, part of the glue will overflow; the overflowed glue adheres to the surface of the support table, which needs to stop the production line for cleaning, which is time-consuming and labor-intensive and affects the production efficiency.

[0006] Therefore, how to prevent the glue from overflowing and adhering to the support table is a technical problem that needs to be solved in the field.

[0007] It should be noted that the above information disclosed in the background section is only used to understand the background of the present application, and therefore, the above description is not considered to constitute the information of the related art. SUMMARY

[0008] The present application provides at least a polarizing plate pasting device and a pasting process.

[0009] In a first aspect, the present application provides a polarizing plate pasting device, comprising:

[0010] a workbench for supporting the polarizing plate;

[0011] A conveying belt is arranged on one side of the workbench to drive the supporting table to move horizontally;

[0012] A film pressing assembly is hinged to the side wall of the workbench to press the polarizing plate;

[0013] The upper surface of the collecting film is provided with a collecting groove, and the collecting film is initially folded into a double-layer structure so that the collecting groove is close to the edge of the liquid crystal plate;

[0014] The free end of the collecting film is provided with a pressure-sensitive adhesive layer to be adhered to the film pressing assembly;

[0015] A fitting robot is arranged above the conveying belt to negatively adsorb the polarizing plate;

[0016] After the polarizing plate is attached to the liquid crystal plate, the conveying belt drives the supporting table to move horizontally relative to the film pressing assembly;

[0017] The film pressing assembly moves on the surface of the polarizing plate to press the polarizing plate so that the overflowed glue flows to the collecting groove;

[0018] When the film pressing assembly moves to the free end of the collecting film, the film pressing assembly is adhered to the free end of the collecting film, and the collecting film is pulled to be unfolded and away from the liquid crystal plate.

[0019] In an alternative embodiment, the film pressing assembly comprises a positioning plate arranged vertically above the conveying belt;

[0020] A rotating shaft is rotatably arranged on the side wall of the workbench and penetrates the positioning plate;

[0021] A pressing roller is rotatably arranged at the lower end of the positioning plate to press the polarizing plate;

[0022] When the conveying belt drives the supporting table to move horizontally, the pressing roller rolls along the surface of the polarizing plate to press the polarizing plate and make the overflowed glue flow to the collecting groove.

[0023] In an alternative embodiment, a torsion spring is sleeved on the outer wall of the rotating shaft, and the two ends of the torsion spring are arranged on the outer wall of the rotating shaft and the side wall of the positioning plate, respectively, and the torsion spring is adapted to push the positioning plate to keep it vertical.

[0024] In an alternative embodiment, the collecting groove is in the shape of “U” with an opening angle of 80±5°, and the inner wall is coated with a hydrophobic coating.

[0025] In an alternative embodiment, the distance between the folding line of the collecting film and the edge of the liquid crystal plate is less than or equal to 0.3 mm.

[0026] In an alternative embodiment, the pressure-sensitive adhesive layer only covers the upper surface of the free end of the collecting film, and the width is 1 / 10-1 / 5 of the width of the collecting film.

[0027] In an alternative embodiment, the surface of the compression roller is coated with a silica gel layer having a Shore hardness of 40±5 HA.

[0028] In an alternative embodiment, a cooling nozzle is arranged on the conveying belt, which is arranged at an end of the conveying belt away from the film compression assembly, and is used to blow towards the unrolled adhesive film.

[0029] In an alternative embodiment, the outlet of the cooling nozzle is flat, and the air speed is 3-5 m / s.

[0030] In an alternative embodiment, the adhesive film is a PETG film with a thickness of 0.5±0.05 mm.

[0031] In a second aspect, the present disclosure also provides a lamination process of the polarizing plate lamination device, which comprises:

[0032] The polarizing plate is horizontally placed on the workbench, and the conveying belt drives the support table on which the liquid crystal plate is placed to move to the lamination position.

[0033] The lamination robot negatively adsorbs the polarizing plate to adhere it to the liquid crystal plate.

[0034] After the polarizing plate is laminated on the liquid crystal plate, the conveying belt drives the support table to move horizontally relative to the film compression assembly.

[0035] The film compression assembly moves on the surface of the polarizing plate, and extrudes the polarizing plate to make the overflowed adhesive flow to the collection groove.

[0036] When the film compression assembly moves to the free end of the adhesive film, it is adhered, and the adhesive film is pulled to be unrolled into a flat state and away from the liquid crystal plate.

[0037] The present application has the advantages that the present application provides a polarizing plate lamination device and a lamination process thereof, which realizes the dynamic process of collecting adhesive on the edge first and cleaning the adhesive away by converting the folding state of the adhesive film into the flat state; in the folding state: the U-shaped collection groove closely adheres to the edge of the liquid crystal plate, and intercepts more than 99% of the overflowed adhesive; after being pulled to be unrolled: the adhesive is taken away from the working area, avoiding the pollution of the support table and reducing the cleaning frequency.

[0038] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application will be realized and achieved by the structures particularly pointed out in the description and the appended drawings.

[0039] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the specific embodiments or the related art of the present application, the following will briefly introduce the drawings needed to be used in the specific embodiments or the related art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0041] Figure 1 A perspective view of the polarizing plate attaching device provided by the embodiment of the present application;

[0042] Figure 2 A perspective view of the conveying belt, the supporting table and the collecting film provided by the embodiment of the present application;

[0043] Figure 3 A perspective view of the collecting film and the film pressing assembly provided by the embodiment of the present application;

[0044] Figure 4 A schematic view of the flat state of the collecting film provided by the embodiment of the present application;

[0045] Figure 5 A perspective view of the pressing roller pressing the polarizing plate provided by the embodiment of the present application;

[0046] Figure 6 A top view of the polarizing plate gluing area state provided by the embodiment of the present application.

[0047] In the drawings:

[0048] 1, workbench; 2, polarizing plate; 3, conveying belt; 30, cooling air nozzle;

[0049] 4, supporting table; 5, liquid crystal plate;

[0050] 6, collecting film; 60, collecting groove; 61, pressure-sensitive adhesive layer;

[0051] 7, film pressing assembly; 71, positioning plate; 72, rotating shaft; 73, pressing roller; 74, torsion spring;

[0052] 8, attaching robot. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are some embodiments of the present application, and not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0054] In this document, when referred to as a first component being on a second component, it can mean that the first component can be directly formed on the second component, or a third component can be interposed between the first component and the second component. Also, in the drawings, the thickness of components can be exaggerated or reduced for effective description of the technical idea.

[0055] In this document, example embodiments of the present disclosure will be described in greater detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of," when preceded by terms that indicate one or more, modify the conjunctive sense of the subsequent terms, rather than the disjunctive sense. For example, the expression "at least one of a, b, and c" should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0056] The terminology used herein is for the purpose of describing particular example configurations only and is not intended to be limiting. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," and "including" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order in which they are discussed or illustrated, unless specifically identified as an order of performance. Additional or alternative steps can be employed.

[0057] As used herein, the phrases "in an embodiment," "according to an embodiment," "in some embodiments," and the like generally mean the particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of the present disclosure. Thus, appearances of such phrases in various places in the specification do not necessarily all refer to the same embodiment. As used herein, the term "example" or "exemplary" means "serving as an example, instance, or illustration." Any implementation, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations, aspects, or designs. Rather, the term "example" or "exemplary" is intended to present concepts in a concrete manner. As used herein, the term "include" means "to include, but not to be limited to."

[0058] It is found through research that, in the related art, a polarizing plate needs to be permanently bonded with a liquid crystal plate by pressure-sensitive adhesive to ensure optical bonding without air bubbles, moisture resistance, impact resistance, and fixation of a polarizing angle.

[0059] During the lamination process, to ensure even distribution of the adhesive layer and eliminate air bubbles (insufficient adhesive can cause air bubbles), pressure causes the pressure-sensitive adhesive to flow, resulting in adhesive being squeezed towards the edges (i.e., edge overflow). This overflowing adhesive flows and accumulates on the metal support (or stage) that supports / laminates the LCD panel. This residual adhesive hardens and solidifies during subsequent production processes, stubbornly adhering to the support surface; it not only severely contaminates the support but the hardened adhesive can also cause localized pressure damage to the subsequently placed LCD panel.

[0060] In existing technologies, a border-based flow-blocking method is typically used, where a non-adhesive flow-blocking layer is pre-installed at the edge of the polarizer to prevent the adhesive from flowing. However, this method increases the cost of photolithography / laser processing, and the flow-blocking layer may affect narrow bezel designs. The flow-blocking layer only prevents the adhesive from flowing beyond the visible edge area of ​​the polarizer; it does not stop the adhesive trapped at the edge from continuing to flow outwards and downwards. Therefore, the blocked adhesive will still overflow onto the support surface, causing the aforementioned serious contamination and equipment damage problems.

[0061] Therefore, during the polarizing plate lamination process, some glue will overflow; the overflowing glue adheres to the surface of the support platform, requiring the production line to be stopped for cleaning, which is time-consuming, labor-intensive, and affects production efficiency.

[0062] Therefore, how to prevent glue from overflowing and adhering to the support platform is a technical problem that urgently needs to be solved in this field.

[0063] The defects in the above solutions and the reasons for their occurrence are the results of the inventors' practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventors' contributions to this disclosure.

[0064] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0065] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0066] like Figures 1 to 5 As shown, at least one embodiment provides a polarizing plate 2 bonding device, comprising:

[0067] Workbench 1, for supporting polarizing plate 2; workbench 1 as a base support platform, for horizontal support of the polarizing plate 2 to be laminated. Conveyor belt 3 is provided on one side of workbench 1, driving the supporting table 4 to move horizontally; the conveyor belt 3 is suitable for accurately driving the supporting table 4 to move horizontally, preferably, the conveyor belt 3 adopts a precision ball screw or synchronous belt transmission mechanism driven by a servo motor, to ensure the moving accuracy and stability of the supporting table 4. At the end of the conveyor belt 3 away from the film pressing assembly 7, such as the left end in Figure 1 , a cooling nozzle 30 is provided. The outlet of the cooling nozzle 30 is designed to be flat, which can produce uniform airflow, and the wind speed is controlled within the range of 3-5m / s, preferably 4m / s. Its role is to blow the expanded adhesive film 6, accelerate the solidification of the collected overflow glue, facilitate subsequent cleaning or recycling, and reduce adhesion. Laminating robot 8 is located above the conveyor belt 3, used for negative pressure adsorption of polarizing plate 2; the laminating robot 8 is located directly above the conveyor belt 3. The laminating robot 8 is equipped with a vacuum chuck at the end, which picks up the polarizing plate 2 on the workbench 1 by negative pressure adsorption, and accurately carries, positions and preliminarily laminates it to the predetermined position of the liquid crystal panel 5 on the supporting table 4. This step is the starting point of precise lamination. In this embodiment, the amount of glue can be controlled, and when the glue is applied, the glue is a certain distance away from the edge of the polarizing plate 2. During the glue coating and pressing process, there will be no glue overflow on both sides of the polarizing plate 2 in the length direction; further, after the polarizing plate 2 is laminated on the liquid crystal panel 5, subsequent cutting is required, therefore, the glue coating range of this embodiment is smaller than the rectangular size of the polarizing plate 2, and needs to be greater than the rectangular size of the polarizing plate 2 after cutting, that is, the glue coating can be full and the edge overflow can be avoided during the coating process. As shown in Figure 6 , area A represents the glue coating area, and area B represents the glue extension area during pressing. During the pressing process, the pressing roller 73 moves from the right end to the left end of the polarizing plate 2, therefore, the right end of the polarizing plate 2 will not have glue overflow and drop on the workbench 1, and the two sides of the polarizing plate 2 in the length direction can also be guaranteed not to have glue overflow from the edge due to the control of the glue coating range and the amount of glue. However, due to the fluctuation of the pressing force of the pressing roller 73 on the polarizing plate 2 and the fluctuation of the moving speed of the pressing roller 73 relative to the polarizing plate 2, although the left end of the polarizing plate 2 is also reserved for glue overflow, due to the fluctuation of the pressing force and the moving speed of the pressing roller 73 relative to the polarizing plate 2, there will be excess glue overflowing from the edge of the left end of the polarizing plate.

[0068] Referring to the accompanying Figure 3 , the film pressing assembly 7 is hinged to the side wall of the workbench 1, used for pressing the polarizing plate 2; the film pressing assembly 7 is the core executive mechanism for realizing the functions of pressing and traction, which specifically includes:

[0069] A positioning plate 71 is vertically arranged above the conveying belt 3 and serves as a support and guide, keeping vertical in the initial state and working state. A rotating shaft 72 is arranged on the side wall of the workbench 1 and penetrates the positioning plate 71. A pressing roller 73 is arranged on the lower end of the positioning plate 71 and serves to press the polarizing plate 2. The surface of the pressing roller 73 is coated with a layer of silicone rubber with a Shore hardness of 40±5HA, preferably 38-42HA. The pressing roller 73 is a component directly contacting the surface of the polarizing plate 2, and the silicone rubber layer with a Shore hardness of about 40HA provides moderate elasticity, which can uniformly apply pressure to remove air bubbles, promote glue flow, and also provide good cushioning protection. The outer wall of the rotating shaft 72 is sleeved with a torsional spring 74, the two ends of the torsional spring 74 are arranged on the outer wall of the rotating shaft 72 and the side wall of the positioning plate 71 respectively, and the torsional spring 74 is suitable for pushing the positioning plate 71 to keep it vertical. The torsional spring 74 applies a torque to push the positioning plate 71 to keep it basically vertical during work, while allowing the pressing roller 73 to adaptively float up and down when encountering slight undulations, ensuring that the pressure is basically constant. This design simplifies the structure and avoids complex pressure feedback control systems. When the conveying belt 3 drives the support table 4 to move horizontally, the pressing roller 73 rolls along the surface of the polarizing plate 2 to press the polarizing plate 2 and make the excess glue flow to the collection groove 60.

[0070] Referring to the accompanying drawings Figure 2 A collection film 6 is initially folded into a double-layer structure to make the collection groove 60 closely adhere to the edge of the liquid crystal panel 5. The collection film 6 is preferably made of PETG (polyethylene terephthalate-1,4-cyclohexane dimethyl ester) film. The thickness of the collection film 6 is strictly controlled to be 0.5±0.05mm, ensuring that it has a certain rigidity to maintain its shape, while not being too heavy to affect folding and traction.

[0071] Referring to the accompanying drawings Figure 2 and Figure 4 A "U"-shaped groove is precisely machined or molded on the upper surface of the collection film 6 (the side facing the polarizing plate 2) as the collection groove 60. The opening angle of the groove is designed to be 80±5°. This angle can more effectively guide the viscous glue into the collection groove 60 during pressing, avoiding glue splashing or excessive spreading along the film surface. The inner wall of the collection groove 60 is uniformly coated with a hydrophobic coating. This coating greatly reduces the adhesion of the glue to the groove wall, ensuring that the glue mainly accumulates at the bottom of the groove by surface tension and gravity, facilitating subsequent removal with the film, and significantly reducing residue in the groove. This design overcomes the problem of the background art that the flow resistance layer affects the narrow frame and increases the cost. Figure 4 In the figure F1 represents the direction of movement of the collection film 6 being pulled out; F2 represents the direction of movement of the pressing roller 73 relative to the support table 4.

[0072] Referring to the accompanying drawings Figure 3The free end of the collecting film 6 is provided with a pressure-sensitive adhesive layer 61 for adhesion to the pressure roller 73.

[0073] The pressure-sensitive adhesive layer 61 only covers the upper surface of the free end, and the width is designed to be 1 / 10 to 1 / 5 of the total width of the collecting film 6. This range ensures sufficient adhesion to be reliably captured by the pressure roller 73, while avoiding excessive adhesion area, which causes the collecting film 6 to be difficult to smoothly unfold or generate excessive resistance in the initial stage of traction. The material of the adhesive layer can be selected from low-adhesion and re-stickable pressure-sensitive adhesive.

[0074] Referring to FIG. 1, the polarizing plate 2 is placed on the workbench 1, and the support table 4 on which the liquid crystal panel 5 is placed is moved to the adhesion position by the conveying belt 3. Figure 5 Before the adhesion operation starts, the collecting film 6 is pre-folded into a double-layer structure. This layer design allows the collecting groove 60 to closely fit the edge of the liquid crystal panel 5 where the polarizing plate 2 is to be attached. The spacing between the folding line and the edge of the liquid crystal panel 5 needs to be strictly controlled to be ≤0.3 mm. This small gap ensures that the collecting film 6 can closely adhere to the edge without excessive compression of the panel or affecting the initial positioning of the polarizing plate 2, which is a key parameter for achieving efficient "edge adhesion and glue collection". Through the conversion mechanism of the folded state to the flat state of the collecting film 6, the dynamic process of collecting glue first at the edge and then moving away for cleaning is realized. In the folded state: the U-shaped collecting groove 60 closely fits the edge of the liquid crystal panel 5, trapping more than 99% of the excess glue; after unfolding: the glue is taken away from the working area, avoiding contamination of the support table 4 and reducing the frequency of cleaning downtime. The coordinated traction design of the pressure roller 73 realizes the dual functions of pressing the polarizing plate 2 and pulling the collecting film 6. The pressure roller 73 adheres the free end of the collecting film 6 to the traction process without additional power consumption, saving equipment costs. Figure 5 F1 in FIG. 1 represents the horizontal movement direction of the support table 4 driving the liquid crystal panel 5 relative to the pressure roller 73, and F2 represents the movement direction of the pressure roller 73 relative to the collecting film 6. Figure 5 The pressure roller 73 in the dotted line state above the pressure-sensitive adhesive layer 61 in FIG. 1 indicates that the pressure roller 73 moves relative to the collecting film 6 to the state of adhesion to the pressure-sensitive adhesive layer 61.

[0075] At least one embodiment provides an adhesion process of a polarizing plate 2 adhesion device, which comprises:

[0076] The polarizing plate 2 is placed horizontally on the workbench 1, and the conveying belt 3 drives the support table 4 on which the liquid crystal panel 5 is placed to move to the adhesion position;

[0077] The adhesion robot 8 negatively adsorbs the polarizing plate 2 to adhere it to the liquid crystal panel 5;

[0078] After the polarizing plate 2 is adhered to the liquid crystal panel 5, the conveying belt 3 drives the support table 4 to move horizontally relative to the film pressing assembly 7;

[0079] The film pressing assembly 7 moves on the surface of the polarizing plate 2 and presses the polarizing plate 2 to make the excess glue flow to the collecting groove 60;

[0080] The film-pressing assembly 7 moves to adhere to the free end of the collecting film 6, and drags the collecting film 6 to be unfolded into a flat shape and away from the liquid crystal panel 5.

[0081] In the description of the embodiments of the present application, unless specifically defined and limited otherwise, the terms "mounting", "connection", "connecting" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0082] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, terms such as "first", "second" and other numerical terms are used herein, unless otherwise indicated herein. Therefore, the first element, component, region, layer or section discussed above can be referred to as the second element, component, region, layer or section without departing from the teachings of the example embodiments.

[0083] With the above ideal embodiments according to the present application as the inspiration, through the above description, relevant personnel can make various changes and modifications without deviating from the scope of the technical idea of the present application. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of the claims.

Claims

1. A polarizing plate bonding device, characterized in that, include: Workbench (1) is used to support polarizing plate (2). The conveyor belt (3) is located on one side of the workbench (1) and drives the support platform (4) to move horizontally. The film pressing assembly (7) is hinged to the side wall of the worktable (1) and is used to press the polarizing plate (2). The adhesive film (6) has a collection groove (60) on its upper surface. It is initially folded into a double-layer structure so that the collection groove (60) is close to the edge of the liquid crystal panel (5). The free end of the adhesive film (6) is provided with a pressure-sensitive adhesive layer (61) for bonding with the film pressing assembly (7); A bonding robot, located above the conveyor belt (3), is used to negatively adsorb the polarizing plate (2). After the polarizing plate (2) is attached to the liquid crystal panel (5), the conveyor belt (3) drives the support platform (4) to move horizontally relative to the film pressing assembly (7); The pressing assembly (7) moves on the surface of the polarizing plate (2) and squeezes the polarizing plate (2) so that the overflowing glue flows to the collection tank (60). When the pressing assembly (7) moves to the free end of the take-up film (6), it is adhered and pulled to unfold the take-up film (6) into a flat shape and away from the liquid crystal panel (5). The film pressing assembly (7) includes: a positioning plate (71), which is vertically arranged and located above the conveyor belt (3); A rotating shaft (72) is rotatably mounted on the side wall of the worktable (1) and passes through the positioning plate (71). The pressure roller (73) is rotatably mounted at the lower end of the positioning plate (71) and is used to press the polarizing plate (2). When the conveyor belt (3) drives the support platform (4) to move horizontally, the pressure roller (73) rolls along the surface of the polarizing plate (2) to press the polarizing plate (2) and cause the overflow glue to flow to the collection tank (60). The collection trough (60) is U-shaped with an opening angle of 80±5° and its inner wall is coated with a hydrophobic coating. The distance between the fold line of the adhesive film (6) and the edge of the liquid crystal panel (5) is less than or equal to 0.3 mm; The pressure-sensitive adhesive layer (61) covers only the upper surface of the free end of the adhesive collection film (6), and its width is 1 / 10 to 1 / 5 of the width of the adhesive collection film (6).

2. The polarizing plate bonding equipment as described in claim 1, characterized in that, A torsion spring (74) is sleeved on the outer wall of the rotating shaft (72). The two ends of the torsion spring (74) are respectively located on the outer wall of the rotating shaft (72) and the side wall of the positioning plate (71). The torsion spring (74) is adapted to push the positioning plate (71) to keep it vertical.

3. The polarizing plate bonding equipment as described in claim 1, characterized in that, The surface of the pressure roller (73) is covered with a silicone layer with a Shore hardness of 40±5HA.

4. The polarizing plate bonding equipment as described in claim 1, characterized in that, A cooling nozzle (30) is provided on the conveyor belt (3), which is located at the end of the conveyor belt (3) away from the film pressing assembly (7). The cooling nozzle (30) is used to blow on the unfolded film (6).

5. The polarizing plate bonding equipment as described in claim 4, characterized in that, The outlet of the cooling nozzle (30) is flat and the wind speed is 3-5 m / s.

6. The polarizing plate bonding equipment as described in claim 1, characterized in that, The adhesive film (6) is made of PETG film with a thickness of 0.5±0.05mm.

7. A bonding process for a polarizing plate bonding equipment, characterized in that, Using the polarizing plate bonding equipment as described in any one of claims 1-6, the bonding process includes: The polarizing plate (2) is placed horizontally on the workbench (1), and the conveyor belt (3) drives the support platform (4) on which the liquid crystal plate (5) is placed to move to the pasting station; The negative pressure adsorption polarizing plate (2) of the robotic arm is used to attach it to the liquid crystal panel (5); After the polarizing plate (2) is attached to the liquid crystal panel (5), the conveyor belt (3) drives the support platform (4) to move horizontally relative to the film pressing assembly (7); The pressing assembly (7) moves on the surface of the polarizing plate (2) and squeezes the polarizing plate (2) so that the overflowing glue flows to the collection tank (60). When the pressing assembly (7) moves to the free end of the take-up film (6), it is adhered and pulled to unfold the take-up film (6) into a flat shape and away from the liquid crystal panel (5).

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