An accumulation body of ultra-thin soft glass and its manufacturing method

Abstract

The present invention discloses an accumulation body of ultra-thin soft glass and a manufacturing method thereof. The upper and lower layers as the substrate are white glass, and at least one group of composite layers is arranged between the upper and lower layers of white glass; the composite layers are of two types, and the first type of composite layers are composed of adhesive layer-buffer film layer-adhesive layer-ultra-thin film glass-adhesive layer-buffer film layer-adhesive layer in sequence; the second type of composite layers are composed of adhesive layer-buffer film layer-adhesive layer-ultra-thin film glass-buffer film layer-adhesive layer in sequence; the buffer film layer adopts structural polyurethane prepolymer adhesive. The manufacturing method of the accumulation body of ultra-thin soft glass includes a spare parts stage, an adhesive coating stage, a whole sheet accumulation stage, a rolling stage, a curing stage, a cutting stage, an inspection, a packaging and a finished product collection stage.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic product display screens, and in particular to a panel glass structure of a flexible display screen and a manufacturing technology thereof. Background Art

[0002] The display screens of electronic products such as smartphones and tablets with conventional technology mainly use glass cover plates, and currently, the glass used is basically ultra-thin glass. This ultra-thin glass product is too thin and has problems such as easy cracking when processed as a single sheet, making it almost impossible to process.

[0003] In order to solve these problems, the industry usually accumulates multiple layers of ultra-thin glass, and then cuts the accumulated multiple layers of glass into locked sizes. The accumulated layer, that is, the accumulated glass after coating with glue, is repeated dozens of times and then cut. This technology has problems such as easy breakage during rolling when making the accumulated layer. The reason is that the coated glue becomes hard and cannot absorb the impact of pressurization. Secondly, when the entire accumulated layer is cut into locked size, the glass at the top of the stack is easy to break or have gaps, resulting in an increase in the defective rate of the product. In addition, even if the rough cut edge is ground after cutting, there are still problems such as easy breakage due to external impact due to the unevenness of the cut surface. Summary of the invention

[0004] The purpose of the present invention is to overcome the film layer structure defects and the shortcomings of easy brittle cracking in the prior art electronic product display screen glass, and to provide a method for preventing damage to ultra-thin glass caused by external forces during the initial accumulation layer process, which can realize mass production of foldable, retractable, and curled ultra-thin film glass with excellent strength and a processing method thereof. This method can solve the processing of ultra-thin soft glass with a thickness of less than 100μm that cannot be processed by traditional technology.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] An accumulation of ultra-thin soft glass, characterized in that the upper and lower layers as substrates are white glass, and at least one group of composite layers is arranged between the upper and lower layers of white glass; the composite layers are of two types, the first type of composite layers is composed of adhesive layer-buffer film layer-adhesive layer-ultra-thin film glass-adhesive layer-buffer film layer-adhesive layer in sequence; the second type of composite layers is composed of adhesive layer-buffer film layer-adhesive layer-ultra-thin film glass-buffer film layer-adhesive layer in sequence; the buffer film layer adopts a structural polyurethane prepolymer adhesive.

[0007] One of the innovative points that distinguishes this technical solution from conventional technologies is that a functional composite film is used between the upper and lower substrates instead of a conventional single adhesive film, and the addition of a buffer film layer plays a key role.

[0008] In a preferred embodiment, the adhesive layer is made of UV adhesive or thermosetting adhesive; the buffer film layer is PVC or other polyurethane films with a thickness of 20 to 70 μm; and the white glass is transparent glass with a thickness of 200 to 400 μm.

[0009] In a preferred embodiment, the number of the composite layers is 2-20 groups.

[0010] According to a preferred embodiment, a composite layer is arranged between the upper and lower layers of white glass, which is composed of one group of the first and second groups and is integrated into: adhesive layer-buffer film layer-adhesive layer-ultra-thin film glass-adhesive layer-buffer film layer-adhesive layer-ultra-thin film glass-buffer film layer-adhesive layer.

[0011] The manufacturing process of the ultra-thin soft glass accumulation body described in each of the above items includes the following steps:

[0012] 1) Spare parts stage:

[0013] Prepare the entire glass sheet of 500×500mm required for manufacturing the entire accumulation layer, clean it, and inspect it to confirm that there are no defective products. The above specifications can correspond to finished workpieces of 3 inches to 15 inches in size.

[0014] 2) Glue coating stage:

[0015] Special note: This process is explained by taking the different film layers of the first group of composite films as an example. The corresponding processes for structures with multiple groups of composite films are similarly performed, and the following subsequent processes are explained in the same way;

[0016] In the adhesive coating stage, UV adhesive is used to coat the entire glass.

[0017] 3) The whole accumulation stage:

[0018] A buffer film layer is accumulated on the adhesive coating layer of the entire glass, and the buffer film material is porous polyurethane foam.

[0019] 4) Rolling stage:

[0020] Add white glass on top of the accumulated buffer film layer and use a pressure roller brush method to remove bubbles.

[0021] 5) Curing stage:

[0022] The adhesive layer is cured by irradiating ultraviolet rays, so that the entire glass, the adhesive layer and the buffer film layer are fixedly connected together.

[0023] 6) Cutting stage:

[0024] The whole glass is cut into glass accumulation bodies of locked size through the cutting stage.

[0025] 7) Inspection, packaging and storage of finished products.

[0026] In a preferred embodiment, the entire glass is first cleaned by using a degreasing solvent, including acetone, butanone or methyl ethyl ketone for 10-15 minutes, then washed with distilled water and then dried.

[0027] According to a preferred embodiment, the cutting stage includes cutting the entire accumulated layer into parts of locked size and then chamfering and perforating them through CNC machining. After cutting and CNC machining, the cut surfaces of the parts are processed by roller brushes to obtain a flat grinding process. After the grinding process, the parts are then immersed in a hydrofluoric acid solution to remove the remaining wounds on the processed surfaces.

[0028] The beneficial effects of the present invention are:

[0029] 1. A composite film is set in the middle of the double-sided glass substrate to greatly enhance the product's anti-crack and anti-bending functions;

[0030] 2. A buffer film is set in the middle layer of the composite film to absorb and resolve the uneven pressure from the surface of the product. The white glass at the upper and lower ends of the accumulation layer solves the problem of the top and bottom layers of glass being fragile and causing gaps when cutting in the prior art;

[0031] 3. It can manufacture large-scale semi-finished products and then cut them into small-area finished parts that meet the requirements, greatly improving work efficiency and yield rate;

[0032] 4. It is conducive to mass production and reduces costs;

[0033] 5. Add white glass on the top of the accumulation layer and use a pressurized roller brush to roll it to remove bubbles and ensure quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the structure of an embodiment of the present invention;

[0035] Figure 2 It is a schematic diagram of a single glued membrane structure in the prior art.

[0036] In the figure: upper bottom layer of white glass 1; lower bottom layer of white glass 2; first type of composite layer 3; adhesive layer 4; buffer film layer 5; ultra-thin film glass 6; second type of composite layer 7; single adhesive film 8. DETAILED DESCRIPTION

[0037] The following is a detailed description of an embodiment of the present invention in conjunction with the accompanying drawings: This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0038] Example: See attached Figure 1, an accumulation of ultra-thin soft glass, comprising an upper bottom layer of white glass 1 and a lower bottom layer of white glass 2 as a substrate (for ease of understanding, the upper bottom layer of white glass 1 and the lower bottom layer of white glass 2 are respectively marked with figure numbers), and at least one group of composite layers is arranged between the upper bottom layer of white glass 1 and the lower bottom layer of white glass 2; there are two types of composite layers, the first type of composite layer 3 is composed of adhesive layer 4-buffer film layer 5-adhesive layer 4-ultra-thin film glass 6-adhesive layer 4-buffer film layer 5-adhesive layer 4 in sequence; the second type of composite layer 7 is composed of adhesive layer 4-buffer film layer 5-adhesive layer 4-ultra-thin film glass 6-buffer film layer 5-adhesive layer 4 in sequence. The number of composite layers can generally be 2-20 groups as needed. In this embodiment, one group of the first type composite layer 3 and one group of the second type composite layer 7 are respectively taken for integration, and a part of the two overlapping adhesive layers 4 is discarded to form the following structure: adhesive layer 4-buffer film layer 5-adhesive layer 4-ultra-thin film glass 6-adhesive layer 4-buffer film layer 5-adhesive layer 4-ultra-thin film glass 6-buffer film layer 5-adhesive layer 4; the buffer film layer 5 adopts a structural polyurethane prepolymer adhesive.

[0039] One of the innovative points of the present technical solution that is different from the conventional technology is that a functional composite film is used between the upper and lower substrates instead of a conventional single adhesive film 8, wherein the addition of the buffer film layer 5 plays a key role.

[0040] The adhesive layer 4 is UV adhesive; the buffer film layer 5 is a polyurethane adhesive film with a thickness of 50 μm; the upper bottom layer of white glass 1 and the lower bottom layer of white glass 2 are transparent glasses with a thickness of 200 to 400 μm respectively.

[0041] Polyurethane adhesives have good peel strength and shock resistance, and have certain resistance to acids, alkalis and solvents. Their low-temperature performance is unmatched by other adhesives such as epoxy adhesives.

[0042] The manufacturing method of the above-mentioned ultra-thin soft glass accumulation body comprises the following process steps:

[0043] 1) Spare parts stage:

[0044] Prepare a whole sheet of glass of 500×500 mm required for manufacturing the whole accumulation layer, and clean it. First, use a degreasing solvent, including acetone, butanone or methyl ethyl ketone, to clean it for 10-15 minutes. After cleaning with the degreasing solvent, wash it with distilled water, dry it, and inspect it to confirm that there are no defective products.

[0045] 2) Glue coating stage:

[0046] Special note: This process is explained by taking the first group of composite membranes as an example. The corresponding processes for structures with multiple groups of composite membranes are similarly executed, and the following subsequent processes are explained in the same way;

[0047] In the adhesive coating stage, UV adhesive is used to coat the entire glass.

[0048] 3) The whole accumulation stage:

[0049] A buffer film layer is accumulated on the adhesive layer 4 of the entire glass, and the buffer film material uses porous polyurethane foam.

[0050] 4) Rolling stage:

[0051] Add white glass on the accumulated buffer film layer 5 and use a pressure roller brush method to remove bubbles. Because the entire glass is adhered to a thin film, bubbles will be generated between the accumulated layers when the liquid adhesive and the buffer film are applied. In order to control and eliminate the generation of these bubbles, add white glass on the top of the entire accumulation layer and use a pressure roller brush to remove the bubbles. During the pressure rolling stage, the ultra-thin film glass 6 on the top of the entire glass may be bent and damaged due to the concentrated force of the pressure roller brush. In order to prevent damage, white glass is used on the top of the accumulation layer, and a buffer film layer 5 is added in the middle to weaken the hardness to solve the problem of breakage or damage during processing. The thickness of the white glass in this embodiment is specifically 300μm.

[0052] 5) Curing stage:

[0053] The adhesive is cured by irradiating ultraviolet rays to fix the entire glass, adhesive and buffer film together.

[0054] 6) Cutting stage:

[0055] The entire glass is cut into a glass accumulation body of a locked size through the cutting stage. At the same time, the entire accumulation layer is cut into parts of a locked size and then chamfered and perforated through CNC machining. After cutting and CNC machining, the cut surface of the part is processed with a roller brush to obtain a flat grinding process. After the grinding process, the parts are immersed in a hydrofluoric acid solution to remove the remaining wounds on the processed surface.

[0056] 7) Inspection, packaging and storage of finished products.

[0057] As a comparison, Figure 2 A single glued film structure of the prior art is shown.

[0058] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An accumulation of ultra-thin soft glass, characterized in that: The upper and lower layers serving as the substrate are white glass, and at least one group of composite layers is arranged between the upper and lower layers of white glass; there are two types of composite layers, and the first type of composite layers are composed of adhesive layer, buffer film layer, adhesive layer, ultra-thin film glass, adhesive layer, buffer film layer and adhesive layer in sequence; the second type of composite layers are composed of adhesive layer, buffer film layer, adhesive layer, ultra-thin film glass, buffer film layer and adhesive layer in sequence, and the buffer film layer is made of porous polyurethane foam.

2. The ultra-thin soft glass accumulation body according to claim 1, characterized in that: The adhesive layer is made of ultraviolet UV adhesive or thermosetting adhesive; the thickness of the buffer film layer is 20-70 μm; and the white glass is transparent glass with a thickness of 200-400 μm.

3. The ultra-thin soft glass accumulation body according to claim 1 or 2, characterized in that: The number of composite layers is 2-20.

4. The ultra-thin soft glass accumulation body according to claim 1 or 2, characterized in that: Between the upper and lower layers of white glass, a composite layer is arranged consisting of one group of the first and second categories and is integrated into: adhesive layer, buffer film layer, adhesive layer, ultra-thin film glass, adhesive layer, buffer film layer, adhesive layer, ultra-thin film glass, buffer film layer and adhesive layer.

5. The method for manufacturing an accumulation of ultra-thin soft glass according to any one of claims 1 to 4, characterized in that: The manufacturing process includes the following steps: 1) Spare parts stage: Prepare a whole sheet of glass of 500×500mm required for manufacturing the entire accumulation layer, clean it, and inspect it to confirm that there are no defective products; 2) Glue coating stage: In the adhesive coating stage, UV adhesive is used to coat the entire glass; 3) The whole accumulation stage: A buffer film layer is accumulated on the adhesive layer applied on the entire glass; 4) Rolling stage: Add white glass on top of the accumulated buffer film layer and use the pressure roller brush method to remove bubbles; 5) Curing stage: The adhesive is cured by irradiating ultraviolet rays to fix the entire glass, adhesive and buffer film together; 6) Cutting stage: The whole sheet of glass is cut into glass accumulation bodies of locked size through the cutting stage; 7) Inspection, packaging and storage of finished products.

6. The method for manufacturing an accumulation of ultra-thin soft glass according to claim 5, characterized in that: The whole glass is first cleaned by using a degreasing solvent, including acetone, butanone or methyl ethyl ketone, for 10-15 minutes, then washed with distilled water and then dried.

7. The method for manufacturing an accumulation of ultra-thin soft glass according to claim 5, characterized in that: The cutting stage includes cutting the entire accumulated layer into parts of locked size and then performing chamfering and perforating through CNC machining. After cutting and CNC machining, the cut surface of the part is processed by roller brush to obtain a flat grinding process. After the grinding process, the parts are then immersed in a hydrofluoric acid solution to remove the remaining wounds on the processed surface for a shaping process.

Images