An ultrathin glass dispensing, bonding and curing method

Abstract

The application discloses a kind of ultrathin glass point glue bonding solidification method, belong to glass bonding technical field.The scheme is bonded first film material on the lower surface of ultrathin glass, the upper surface side is carried out liquid optical glue point glue along edge, then the upper surface of ultrathin glass is covered with second film material, the liquid optical glue is carried out roll glue pressing operation on the surface of second film material, so that the liquid optical glue is evenly distributed on the upper surface of the ultrathin glass, so that the liquid optical glue solidification.The optical glue adhered to the surface of ultrathin glass after solidification, the bending resistance of ultrathin glass is enhanced, the pencil tip compression test, the scratch resistance, the drop test ability.The scheme is not easy to introduce bubble compared with the scheme of attaching film material on the surface of ultrathin glass, the bending resistance is more obvious, the optical glue is wrapped in the whole range of the surface of ultrathin glass, the protection is stronger, the bonding process is less, and the efficiency is higher.

Description

Technical Field

[0001] This invention relates to the field of glass bonding technology, and more particularly to a method for bonding and curing ultrathin glass with adhesive. Background Technology

[0002] Ultra-thin glass is mainly used for the inner and outer screens of foldable phones and tablets. These applications place high demands on the ultra-thin glass's bending resistance, pen tip pressure resistance, scratch resistance, drop resistance, and light transmittance. Existing technology improves these capabilities by laminating a film material onto the surface of the ultra-thin glass. This involves first cutting the film material to the appropriate size according to the ultra-thin glass dimensions, cleaning the film material, and then laminating it onto the ultra-thin glass surface.

[0003] However, the above method has the following problems:

[0004] (1) Air bubbles are easily generated during the process of cutting and bonding the membrane material, and the air bubbles are not easy to separate.

[0005] (2) Membrane materials have limited effect on improving the bending resistance of ultra-thin glass;

[0006] (3) Due to the errors in the glass processing dimensions and the film material cutting dimensions, the bonding equipment itself will also have bonding errors. The glass and film material dimensions cannot be 1:1. Usually, the film material needs to be shrunk in a small proportion, resulting in a ring of ultra-thin glass being exposed. The exposed part is not protected by the film material.

[0007] (4) The membrane material needs to be precisely cut in advance, and the membrane material needs to be cleaned and the base film removed before bonding. There are many steps involved, resulting in low efficiency. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide an ultra-thin glass dispensing, bonding and curing method to address the above-mentioned deficiencies of the prior art.

[0009] To achieve the above objectives, the present invention provides a method for dispensing, bonding, and curing ultrathin glass, wherein the ultrathin glass is a rectangular flat glass, and the method includes the following steps:

[0010] Step S1: A first film material is attached to the lower surface of the ultrathin glass; the size of the first film material is larger than the size of the lower surface of the ultrathin glass.

[0011] Step S2: Apply liquid optical adhesive along the edge on one side of the upper surface of the ultrathin glass.

[0012] Step S3: Cover the upper surface of the ultrathin glass with a second film material; the size of the second film material is larger than the size of the upper surface of the ultrathin glass.

[0013] Step S4: Perform a rolling and pressing operation on the surface of the second film material to make the liquid optical adhesive evenly distributed on the upper surface of the ultrathin glass.

[0014] Step S5: Curing the liquid optical adhesive.

[0015] Preferably, the refractive index of the liquid optical adhesive is close to that of the ultrathin glass.

[0016] Preferably, the first membrane material and the second membrane material are engineering plastics.

[0017] Preferably, the engineering plastics include PET, PC, TAC, and PMMA.

[0018] Preferably, in step S1, the method of bonding the first film material to the lower surface of the ultrathin glass is: rolling and pressing.

[0019] Preferably, in step S4, the method of roller pressing is: rolling from the edge where the liquid optical adhesive is located to the opposite edge in one pass.

[0020] Preferably, in step S5, the method for curing the liquid optical adhesive is UV light curing.

[0021] Preferably, the method further includes: step S6, removing excess first and second film materials around the ultrathin glass by laser cutting.

[0022] The present invention has the following beneficial effects: The present invention involves bonding a first film material to the lower surface of an ultra-thin glass, applying liquid optical adhesive along the edge of one side of the upper surface, then covering the upper surface of the ultra-thin glass with a second film material, and performing a rolling and pressing operation on the surface of the second film material to evenly distribute the liquid optical adhesive on the upper surface of the ultra-thin glass, allowing the liquid optical adhesive to cure. The cured optical adhesive adheres to the surface of the ultra-thin glass, enhancing its bending resistance, pen tip pressure resistance, scratch resistance, and drop resistance. Compared to the method of simply attaching a film material to the surface of the ultra-thin glass, this method is less prone to introducing air bubbles, significantly improves bending resistance, provides full coverage of the ultra-thin glass surface with the optical adhesive, offers stronger protection, and involves fewer bonding steps and higher efficiency. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0024] Figure 1 This is a schematic diagram of the steps of the ultrathin glass dispensing, bonding, and curing method provided in an embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram of the ultra-thin glass bonding structure provided in an embodiment of the present invention. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] The embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. It should be understood that the embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.

[0028] This invention relates to the formation of a cured optical adhesive layer on the surface of planar ultrathin glass to improve its bending resistance, pen tip pressure resistance, scratch resistance, and drop resistance. The planar ultrathin glass is used for the inner and outer screens of foldable mobile phones and tablets.

[0029] like Figure 1 As shown in the figure, this embodiment of the invention provides a method for dispensing, bonding, and curing ultrathin glass, wherein the ultrathin glass is a rectangular flat glass, and the method includes the following steps:

[0030] Step S1: A first film material is attached to the lower surface of the ultrathin glass, wherein the size of the first film material is larger than the size of the lower surface of the ultrathin glass.

[0031] In this embodiment of the invention, in step S1, the method of bonding the first film material to the lower surface of the ultrathin glass is: roll pressing. In some embodiments of the invention, a stencil laminating machine is used to bond the first film material to the lower surface of the ultrathin glass by roll pressing.

[0032] Step S2: Apply liquid optical adhesive along the edge on one side of the upper surface of the ultrathin glass.

[0033] In this embodiment of the invention, the liquid optical adhesive is a special adhesive for the optical industry, which has ultra-high transmittance, adhesion, and waterproof, dustproof and corrosion-resistant capabilities, thereby improving the environmental testing capabilities of the product and expanding the applicable scenarios of the product.

[0034] In this embodiment of the invention, the refractive index of the liquid optical adhesive is close to that of the ultrathin glass.

[0035] In this embodiment of the invention, the main components of the optical adhesive are acrylate, light-curing agent, leveling agent, toughening agent, reinforcing agent, and other related additives. The composition of the optical adhesive can be adjusted according to actual conditions to optimize it to meet the relevant limit tests for ultra-thin glass. Various additives enable the adhesive to adhere well to the surface of the ultra-thin glass and undergo a curing reaction. The functional groups in the adhesive combine with the surface of the ultra-thin glass, thereby improving the optical performance, bending resistance, pen tip pressure resistance, scratch resistance, and drop resistance of the ultra-thin glass. The refractive index of the optical adhesive needs to be as close as possible to the refractive index of the ultra-thin glass; the closer the refractive index, the better the appearance. It is generally believed in the industry that the refractive index error should be <0.1. The higher the transmittance of the optical adhesive, the better. Higher transmittance means less light loss through the optical adhesive, resulting in better imaging. The optical adhesive used in this embodiment of the invention has a transmittance of over 90%.

[0036] In this embodiment of the invention, a dispensing and bonding curing machine is used to complete steps S2-S5. The dispensing of liquid optical adhesive along the edge of one side of the upper surface of the ultra-thin glass is to facilitate subsequent roll bonding in one direction. For example, adhesive can be dispensed at the left edge of the upper surface, followed by roll bonding from left to right; or at the right edge of the upper surface, followed by roll bonding from right to left; or at the upper edge of the upper surface, followed by roll bonding from top to bottom; or at the lower edge of the upper surface, followed by roll bonding from bottom to top. Specifically, the ultra-thin glass is placed at the dispensing station with the upper surface facing upwards, and the amount and path of adhesive are precisely controlled during the dispensing operation to ensure sufficient adhesive coverage of the entire upper surface after roll bonding.

[0037] Step S3: Cover the upper surface of the ultrathin glass with a second film material, the size of which is larger than the size of the upper surface of the ultrathin glass.

[0038] In this embodiment of the invention, the size of the first film material is larger than the size of the lower surface of the ultra-thin glass, and the size of the second film material is larger than the size of the upper surface of the ultra-thin glass. The excess adhesive generated during the roll bonding process adheres between the first and second film materials and will not contaminate the inside of the equipment. Due to the adhesive properties of the first film material, the excess adhesive can be easily peeled off from the edge of the ultra-thin glass, eliminating the need for secondary cleaning of the adhesive at the glass edge.

[0039] The dimensions of the first and second film materials need to be designed to withstand adhesive overflow. In practical applications, the dimensions of the first and second film materials are determined based on the dimensions of the ultra-thin glass product itself. For example, the size ratio of the first and second film materials to the ultra-thin glass can be 1.2–1.8:1.2–1.8:1. The dimensions of the first and second film materials can be the same or different.

[0040] This invention does not impose any particular restrictions on the method of covering the ultrathin glass surface with the second film material, as long as it ensures that the areas where the first and second film materials are located opposite each other on the periphery of the ultrathin glass can withstand excess adhesive. In some embodiments of this invention, the second film material is manually applied to the ultrathin glass surface after adhesive application. In other embodiments of this invention, the second film material is placed on the ultrathin glass surface after adhesive application using a positioning device and a robotic arm.

[0041] In this embodiment of the invention, the first membrane material and the second membrane material are engineering plastics, including PET, PC, TAC, and PMMA.

[0042] Step S4: Roll the liquid optical adhesive onto the surface of the second film material to make the liquid optical adhesive evenly distributed on the upper surface of the ultrathin glass.

[0043] In this embodiment of the invention, step S4, the method of the roll-bonding pressing operation, is as follows: roll-bonding is performed from the edge where the liquid optical adhesive is located to the opposite edge in one pass. In practical applications, ultra-thin glass is transferred to the roll-bonding station, and by precisely setting control parameters, the roll-bonding pressing operation can be completed in one pass, improving production efficiency.

[0044] A second film is coated onto the surface of ultra-thin glass, and then liquid optical adhesive is applied to the surface of the second film using a roller bonding process. The rollers do not directly contact the optical adhesive, thus avoiding contamination and eliminating the need for roller cleaning, thereby extending their lifespan. Furthermore, the roller bonding method allows for adjustment of film thickness by adjusting pressure and speed. Roller bonding parameters and operations are controlled by a computer, facilitating the switching between different film thicknesses. Compared to the traditional method of directly applying adhesive using a scraping device, the roller bonding method of this invention is scientific, efficient, precise, and convenient for mass production.

[0045] At this point, the liquid optical adhesive has been uniformly applied to the entire surface of the ultrathin glass, forming an optical adhesive layer on the surface. For example... Figure 2 The diagram shows a schematic of an ultra-thin glass bonding structure according to some embodiments of the present invention. A first film material 2 is bonded to the lower surface of the ultra-thin glass 1. An optical adhesive layer 3 and a second film material 4 are sequentially arranged on the upper surface of the ultra-thin glass 1 along the direction away from the ultra-thin glass. The size of the optical adhesive layer 3 is the same as that of the ultra-thin glass 1. Both the first film material 1 and the second film material 2 are larger than the size of the ultra-thin glass 1.

[0046] Step S5: Curing the liquid optical adhesive.

[0047] In this embodiment of the invention, the method for curing the liquid optical adhesive is UV curing. In practical applications, after the roller bonding is completed, the ultra-thin glass is transferred to the UV machine station, and the UV lamp is turned on to cause the liquid optical adhesive to undergo a curing reaction. UV curing has the advantages of high speed, strong thickness stability, and high transparency after curing.

[0048] In this embodiment of the invention, the adhesive bonding and curing method has high product compatibility. The amount of adhesive can be adjusted in real time according to the shape and size of the ultra-thin glass. Compared with the film bonding method in the prior art, it does not require precise cutting of the shape and cleaning in advance, which reduces production steps and production costs and improves production efficiency.

[0049] In some embodiments of the present invention, the ultrathin glass dispensing and bonding curing method further includes:

[0050] Step S6: Remove excess first and second membrane materials from the outer periphery of the ultrathin glass using laser cutting.

[0051] After laser cutting, the first and second films remain on the ultrathin glass. The first film can be peeled off. If the second film does not need to be retained, it can be hydrophobically treated before step S3. After hydrophobic treatment, the cured optical adhesive has poor adhesion to the second film, making it easier to peel off.

[0052] The present invention has the following beneficial effects: The present invention involves bonding a first film material to the lower surface of an ultra-thin glass, applying liquid optical adhesive along the edge of one side of the upper surface, then covering the upper surface of the ultra-thin glass with a second film material. A rolling and pressing operation is then performed on the surface of the second film material to evenly distribute the liquid optical adhesive on the upper surface of the ultra-thin glass, allowing the liquid optical adhesive to cure. The cured optical adhesive adheres to the surface of the ultra-thin glass, enhancing its bending resistance, pen tip pressure resistance, scratch resistance, and drop resistance, thereby increasing product lifespan and reducing after-sales maintenance costs. Compared to the method of simply attaching a film material to the surface of the ultra-thin glass, this method is less prone to introducing air bubbles, significantly improves bending resistance, provides full coverage of the ultra-thin glass surface with the optical adhesive, offers stronger protection, and involves fewer bonding steps and higher efficiency.

[0053] Furthermore, the combined use of the first and second membrane materials effectively absorbs excess adhesive, maintaining the cleanliness of the rollers and equipment. Compared to the traditional method of directly applying adhesive using a scraping device, the roller-pressing method of this invention is scientific, efficient, precise, and convenient for mass production.

[0054] The above are merely specific embodiments of the present invention and should not be construed as limiting the scope of the present invention. Equivalent variations made by those skilled in the art based on this invention, as well as changes well-known to those skilled in the art, should still fall within the scope of the present invention.

Claims

1. A method for dispensing and curing ultrathin glass, wherein the ultrathin glass is a rectangular flat glass, characterized in that, The method includes the following steps: Step S1: A first film material is attached to the lower surface of the ultrathin glass; the size of the first film material is larger than the size of the lower surface of the ultrathin glass. Step S2: Apply liquid optical adhesive along the edge on one side of the upper surface of the ultrathin glass. Step S3: Cover the upper surface of the ultrathin glass with a second film material; the size of the second film material is larger than the size of the upper surface of the ultrathin glass. Step S4: Perform a rolling and pressing operation on the surface of the second film material to make the liquid optical adhesive evenly distributed on the upper surface of the ultrathin glass. Step S5: Curing the liquid optical adhesive; Step S6: Remove excess first and second film materials from the outer periphery of the ultrathin glass using laser cutting; In step S4, the method of roller pressing is as follows: roller pressing is performed from the edge where the liquid optical adhesive is located to the opposite edge in one pass.

2. The ultra-thin glass dispensing, bonding, and curing method according to claim 1, characterized in that, The refractive index of the liquid optical adhesive is close to that of the ultrathin glass.

3. The ultrathin glass dispensing, bonding, and curing method according to claim 1, characterized in that, The first membrane material and the second membrane material are engineering plastics.

4. The ultrathin glass dispensing, bonding, and curing method according to claim 3, characterized in that, The engineering plastics include PET, PC, TAC, and PMMA.

5. The ultrathin glass dispensing, bonding, and curing method according to claim 1, characterized in that, In step S1, the method of bonding the first film material to the lower surface of the ultrathin glass is: rolling and pressing.

6. The ultrathin glass dispensing, bonding, and curing method according to claim 1, characterized in that, In step S5, the method for curing the liquid optical adhesive is UV light curing.

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