Double-sided folded glass product and preparation method thereof

Abstract

The invention discloses a double-sided folding glass product and a preparation method thereof, the glass product mainly comprises a substrate, the substrate comprises through hole areas arranged at intervals in a first direction and a folding area arranged between the two through hole areas, the through hole areas are provided with through holes, the folding area comprises a first surface and a second surface which are oppositely arranged and face to a recess, and the first surface and the second surface are provided with through holes. And meanwhile, first blind holes and second blind holes are formed in the folding area in the second direction, multiple groups of first blind holes and multiple groups of second blind holes are alternately formed in the first direction, and reinforcing layers are correspondingly arranged on the first surface and the second surface so as to fill and protect the blind holes. The two opposite surfaces of the folding area are sunken, so that the thin folding area is manufactured to meet the bending requirements of glass products with different thicknesses, meanwhile, the bidirectional folding function of the folding area is achieved through the alternate blind hole structure design, protection in the blind area folding process is achieved through the strengthening layer, and the bending quality of the glass products is improved. The stability and the service life in the folding process are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of glass processing, and particularly relates to a double-sided folding glass product and a preparation method thereof. Background Art

[0002] With the rise of folding screen devices such as mobile phones and tablet displays, the requirements for folding screen support structural components are also getting higher and higher. Currently, the commonly used folding structures mostly process micro through-holes in glass and fill them with special materials to disperse the stress during the folding process to achieve the foldability of glass products; however, it can only process thin glass substrates, and the design structures mostly only meet the one-way folding requirements. For thicker glass structures, it is difficult to process well and cannot meet their complex folding requirements.

[0003] Therefore, how to meet the two-way folding requirements of glass products and improve their folding service life is a technical problem that those skilled in the art need to solve urgently. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a double-sided folding glass product to meet the two-way folding requirements of glass products and improve their folding service life.

[0005] Another purpose of the present invention is to provide a preparation method of the above double-sided folding glass product.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A double-sided folding glass product includes a substrate. The substrate includes through-hole areas arranged at intervals in a first direction, and folding areas arranged between two adjacent through-hole areas. Through-holes are set in the through-hole areas according to graphic requirements and metallization treatment is carried out.

[0008] The folding area includes a first surface and a second surface that are oppositely arranged in a second direction and are recessed towards each other. The folding area is provided with a first blind hole and a second blind hole in the second direction. The opening of the first blind hole is located on the first surface, the opening of the second blind hole is located on the second surface, and multiple groups of the first blind hole and the second blind hole are alternately arranged along the first direction in the folding area; the first surface and the second surface are respectively provided with strengthening layers, and partial areas of the strengthening layers fill the blind holes.

[0009] Preferably, in the above double-sided folding glass product, both the first surface and the second surface are arc-shaped recessed areas, and the lowest points of both the first surface and the second surface are located at the midpoint position of the folding area in the first direction.

[0010] Preferably, in the above double-sided foldable glass product, the minimum thickness of the folding area is not less than 50 μm, and the depth of the first blind hole accounts for 60%-80% of the thickness of the corresponding position of the folding area.

[0011] Preferably, in the above double-sided foldable glass product, a single set of the first blind holes includes a plurality of spaced-apart partition holes, and the distance between two adjacent partition holes in a single set of the first blind holes is 30 μm - 300 μm.

[0012] Preferably, in the above double-sided foldable glass product, the strengthening layer provided on the first surface includes a first strengthening layer, a second strengthening layer, and a third strengthening layer. The first strengthening layer is a flexible layer and fills to the bottom of the first blind hole. The second strengthening layer seals the first blind hole and extends to the first surface. The third strengthening layer is completely located outside the first blind hole and covers the second strengthening layer.

[0013] Preferably, in the above double-sided foldable glass product, the opening area of the first blind hole and / or the second blind hole is an outwardly expanding horn configuration.

[0014] A method for preparing a double-sided foldable glass, used to prepare the double-sided foldable glass product described in any one of the above embodiments. The preparation method at least includes the following steps:

[0015] Partitioning: A substrate with a first preset thickness is partitioned into a through-hole area and a folding area. The folding area is located between two through-hole areas. The two sides of the folding area in its thickness direction are respectively defined as the first surface and the second surface. Positioning marks are set in the through-hole area.

[0016] First laser treatment: The through-hole area and the folding area are laser-modified. The through-hole area is processed to form through-holes according to graphic requirements. The first surface and the second surface of the folding area are subjected to depth modification treatment of the concave structure. After modification, the first surface and the second surface are uniformly sunken from both sides to the middle.

[0017] First etching: The substrate after the first laser treatment is etched using an alkali solution and / or an acid solution. The laser-treated area of the through-hole area is etched into a through-hole structure. The first surface and the second surface of the folding area are respectively etched into smooth and continuous concave structures.

[0018] Second laser treatment: The first surface and the second surface of the folding area are respectively pre-opened by laser to generate a plurality of staggeredly arranged first blind holes and second blind holes.

[0019] Second etching: The substrate is subjected to second etching. The first blind holes and the second blind holes after the second laser treatment are formed into blind hole structures with outwardly expanding openings. The through-holes in the through-hole area are formed into a preset specification.

[0020] Preferably, in the above preparation method, after the secondary etching step, the following steps are further included:

[0021] Post-treatment: The substrate after secondary etching is put into a basket for toughening to achieve toughening treatment of the through holes and blind holes, and the first surface and the second surface of the folding area are covered by a masking film;

[0022] Through-hole area treatment: The through holes in the through-hole area are metallized by chemical deposition and / or physical deposition;

[0023] Folding area treatment: Remove the masking film on the folding area, first fill the first blind hole and the second blind hole with a flexible first strengthening layer, then add a second strengthening layer that partially extends into the blind hole, and then set a continuous third strengthening layer covering the second strengthening layer;

[0024] Polishing: The surface of the substrate is polished to make the substrate intermediate of the foldable glass product.

[0025] Preferably, in the above preparation method, in the secondary etching step, the solution for etching is an alkaline sodium hydroxide or potassium hydroxide solution.

[0026] Preferably, in the above preparation method, in the primary etching step, the minimum thickness area after etching treatment of the folding area is 50 μm - 200 μm, and the thickness of the folding area is 33% - 66% of the thickness of the through-hole area.

[0027] Preferably, in the above preparation method, in the folding area treatment step, the first strengthening layer is a flexible epoxy resin or polyurethane resin and fills 20% - 40% of the depth of the blind hole; the second strengthening layer is a silicone resin or silicone-modified polyurethane resin with greater flexibility than the first strengthening layer, and the second strengthening layer fills the blind hole and partially overflows the blind hole; the third strengthening layer is a flexible strengthening film with a thickness of 25 μm - 50 μm.

[0028] Preferably, in the above preparation method, in the secondary etching step, the aperture of the opening area of the first blind hole and the second blind hole is 50 μm - 500 μm, the thickness of the folding area at the bottom of the blind hole is 20 μm - 80 μm, and the distance between adjacent first blind holes and second blind holes is 30 μm - 100 μm.

[0029] Preferably, in the above preparation method, the first preset thickness is 0.1 mm - 1.0 mm.

[0030] As can be seen from the above technical solutions, for the double-sided folding glass product provided by the present invention, the substrate is provided with a through-hole area and a folding area. Specifically, the through-hole areas are arranged at intervals in the first direction, and a folding area is arranged between two adjacent through-hole areas. The through-hole areas are used to set through-holes according to graphic requirements and metallize the through-holes to meet display requirements; the folding area is used to realize the bending of the substrate. The two opposite sides of the folding area in the second direction are respectively a first surface and a second surface, and the first surface and the second surface are recessed towards each other to reduce the thickness of the folding area compared with the through-hole area; at the same time, a first blind hole and a second blind hole are arranged on the folding area to meet the bending requirements through the stiffness weakening effect of the blind holes while maintaining the connection effect of the folding area. Specifically, both the first blind hole and the second blind hole are blind holes arranged along the second direction, that is, the thickness direction of the folding area, and the first blind hole opens with the first surface area, and the second blind hole opens with the second surface area to meet the bending requirements of the folding area in two directions on the first surface and the second surface; at the same time, multiple groups of the first blind hole and the second blind hole are alternately arranged on the folding area along the first direction to make the bending performance of the folding area similar in two directions and improve the service life of the folding area. In addition, strengthening layers are respectively arranged on the first surface and the second surface of the folding area. On the one hand, the flexible structure fills into the blind holes to transfer the bending force of the blind holes during the folding process of the folding area and reduce the damage risk at the blind hole position; on the other hand, the strengthening layer covers the first surface and the second surface to protect the blind holes and improve the integrity of the folding area, so that the folding area has a more stable folding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 Schematic diagram of the substrate structure provided by the embodiment of the present invention;

[0033] Figure 2 For Figure 1 top view schematic diagram;

[0034] Figure 3 For Figure 2 schematic diagram of the blind hole structure in the folding area in

[0035] Figure 4 Cross-sectional structure schematic diagram of the folding area;

[0036] Figure 5 Schematic diagram of the folding of the substrate in two directions;

[0037] Figure 6 Schematic flow chart of the preparation method of the double-sided folding glass provided by the embodiment of the present invention;

[0038] Figure 7 Schematic cross-sectional state diagram of the substrate corresponding to some steps of the preparation method;

[0039] Figure 8 Schematic diagram of the single-sided structure of the folding area after the first laser treatment;

[0040] Figure 9 Schematic cross-sectional state diagram of the substrate corresponding to another part of the steps of the preparation method;

[0041] Figure 10 Schematic diagram of the substrate structure after the second laser treatment;

[0042] Figure 11 Schematic cross-sectional state diagram of the substrate corresponding to other parts of the steps of the preparation method.

[0043] Wherein, 10 - substrate; 20 - through-hole area; 30 - folding area; 310 - first surface; 320 - second surface; 330 - first blind hole; 3310 - separation hole; 340 - second blind hole; 3510 - first strengthening layer; 3520 - second strengthening layer; 3530 - third strengthening layer. Detailed implementation manners

[0044] The core of the present invention is to disclose a double-sided folding glass product to meet the two-way folding requirements of the glass product and improve its folding service life.

[0045] Another object of the present invention is to provide a preparation method of the above double-sided folding glass product.

[0046] In order to enable those skilled in the art to better understand the solution of the present invention, the embodiments of the present invention will be described below with reference to the accompanying drawings. In addition, the embodiments shown below do not impose any limitation on the inventive content recorded in the claims. Furthermore, all the contents of the configurations shown in the following embodiments are not limited to what is necessary for the solution of the invention recorded in the claims.

[0047] Such as Figures 1 - 5As shown, the double-sided folding glass product provided by the embodiment of the present invention includes a substrate 10 structure. It should be noted that the substrate 10 does not need to be thinned to less than 0.1 mm as in the conventional technology to obtain the folding performance of flexible glass, so it will not have brittle fracture or obvious flatness problems due to insufficient strength. Specifically, the substrate 10 mainly includes a through-hole area 20 and a folding area 30. Among them, the through-hole area 20 is used for graphic display, and the folding area 30 is an area on the substrate 10 with bending performance to realize the bending of the glass product with the substrate 10.

[0048] The through-hole areas 20 are arranged at intervals in the first direction, and a folding area 30 is arranged between two adjacent through-hole areas 20. Here, the first direction is generally the length direction of the substrate 10, so that two through-hole areas 20 arranged in the length direction of the substrate 10 can perform similar bending actions. The substrate 10 may only have one folding area 30, so that the substrate 10 only has bending performance in one area. For substrates 10 with different lengths or different folding requirements, multiple folding areas 30 can also be set so that the substrate 10 has multiple bendable areas, as long as it is ensured that there are through-hole areas 20 for display on both sides of each folding area 30 in the first direction. At the same time, it should be noted that according to the graphic requirements, through-hole structures are opened in the thickness direction of the through-hole area 20. The opening can be achieved by laser combined with solution etching to maintain the flexibility and specification requirements of the opening area; at the same time, the through-holes are metallized to deposit metal in the through-holes to connect different optoelectronic components through the through-holes, so as to meet the system performance requirements.

[0049] For the folding area 30 on the substrate 10, it includes a first surface 310 and a second surface 320 that are oppositely arranged in the second direction. Here, the second direction is usually the thickness direction of the folding area 30, and the second direction is perpendicular to the first direction. The first surface 310 and the second surface 320 on both sides in the thickness direction of the folding area 30 are recessed towards each other. It should be noted that the mutual recess here specifically means that the first surface 310 is a recessed structure and the bottom of the recess is recessed from the inside of the folding area 30 towards the second surface 320, and the second surface 320 is also a recessed structure and the bottom of its recess is recessed from the inside of the folding area 30 towards the first surface 310, so that the thickness of each position of the folding area 30 is smaller than that of the through-hole areas 20 on both sides. It should be noted that the mutual recessed structure of the first surface 310 and the second surface 320 enables the substrate 10 to maintain sufficient thickness to meet the strength requirements while only being adaptively thinned in the folding area 30 to meet the bending requirements, and it maintains the unity of the thickness and bending requirements of the substrate 10 through precise processing.

[0050] Specifically, the folding area 30 is further provided with a first blind hole 330 and a second blind hole 340 in the first direction. Both the first blind hole 330 and the second blind hole 340 open along the thickness direction of the folding area 30. Among them, the opening of the first blind hole 330 is located on the first surface 310, that is, the first blind hole 330 is a blind hole structure that opens from the first surface 310 towards the second surface 320; while the second blind hole 340 has an opening located on the second surface 320 and is a blind hole structure that opens from the second surface 320 towards the first surface 310. The blind hole structure is to meet the bending requirements of the folding area 30 through the inner diameter deformation area in the hole while maintaining the continuity of the folding area 30 in the first direction. At the same time, since both the first surface 310 and the second surface 320 of the folding area 30 are provided with blind hole structures, the folding area 30 has folding effects in both the forward and reverse directions of the second direction. One bending direction is the bending form in which the first surface 310 shrinks and the second surface 320 expands; while the other bending direction is the bending form in which the first surface 310 expands and the second surface 320 shrinks. The two bending processes are realized through the openings of the first blind hole 330 and the second blind hole 340, and at the same time, the structural stability of the folding area 30 during the bending process is improved through the blind hole structure.

[0051] Meanwhile, to improve the structural stability of the folding area 30, multiple groups of the first blind hole 330 and the second blind hole 340 are alternately arranged along the first direction in the folding area 30, and the number of their settings is the same or similar, so that the folding performance of the folding area 30 in both directions is similar, avoiding the problem of reduced service life of the folding area 30 due to poor single - direction folding performance. At the same time, multiple groups of the first blind hole 330 and the second blind hole 340 can also cooperate during the bending process of the folding area 30 to reduce the deformation amount of a single blind hole and reduce the risk of damage to the blind hole. In addition, strengthening layers are respectively provided on the first surface 310 and the second surface 320 of the folding area 30. Part of the flexible area of the strengthening layer is filled into the blind hole to protect the blind hole and improve the ductility and compressive resistance of the blind hole area. At the same time, part of the area with stronger flexibility on the strengthening layer is located outside the blind hole to cover and protect the first surface 310 and the second surface 320, and endow this area with technical effects such as heat resistance, corrosion resistance, high elasticity and ductility.

[0052] It should be noted that in the above - mentioned embodiment, the substrate 10 can have a thickness of 0.1 mm - 1.0 mm. Through the fine processing of the first surface 310 and the second surface 320 of the folding area 30, in the way of local thinning, while maintaining the good structural strength of the substrate 10, its bending performance requirements can be met, without setting the entire thickness to less than 0.1 mm as in the prior art, improving the structural stability of the substrate 10 and subsequent glass products.

[0053] Furthermore, in the double-sided foldable glass product provided by the embodiments of the present invention, the concave structures on the first surface 310 and the second surface 320 are for achieving local thinning of the thickness of the folding region 30, and after the first blind hole 330 and the second blind hole 340 are provided, the double-sided folding effect of the folding region 30 is achieved. The first surface 310 and the second surface 320 can adopt a stepped concave structure, a linear concave structure, or an alternately concave and convex structure in the first direction to thin the folding region 30. At the same time, the concave structures on the first surface 310 and the second surface 320 can be the same or different. To further optimize the structural stability and folding effect of the folding region 30, in some embodiments of the present invention, both the first surface 310 and the second surface 320 are arc-shaped concave regions, and preferably, the lowest points of the first surface 310 and the second surface 320 are both located at the midpoint position of the folding region 30 in the first direction, that is, the arc-shaped structures of the first surface 310 and the second surface 320 are symmetrically arranged. It should be noted that the concave arc-shaped structures make the first surface 310 and the second surface 320 both be arc surfaces, which can reduce the risk of stress concentration when the folding region 30 is folded in any direction, and the corresponding settings of the lowest points of the first surface 310 and the second surface 320 make the folding region 30 present a structure with gradually curved thinning of the thickness from both sides to the middle, and can better balance the requirements between the structural strength and the bending performance.

[0054] Meanwhile, to balance the requirements of the strength and bending performance of the folding region 30, in the double-sided foldable glass product provided by the embodiments of the present invention, the minimum thickness of the folding region 30 on the substrate 10 is not less than 50 μm to avoid the risk of fracture due to the over-thin folding region 30. In the above embodiments, that is, the connecting line distance in the thickness direction of the folding region 30 at the vertex positions of the arc surfaces of the first surface 310 and the second surface 320 is not less than 50 μm. At the same time, in the region where the first blind hole 330 is provided on the folding region 30, the hole depth of the first blind hole 330 accounts for 60%-80% of the thickness of the corresponding position of the folding region 30. While maintaining good connectivity of the folding region 30 at the bottom region of the first blind hole 330, the hole depth meets the deformation requirements of the bending angle. It should be noted that the structure of the second blind hole 340 is preferably the same as that of the first blind hole 330 to make the structural strength and folding performance of the folding region 30 on the first surface 310 and the second surface 320 similar, and avoid the problem of unidirectional premature damage and failure. The specific structure and depth dimensions of the second blind hole 340 will not be elaborated here.

[0055] In the above embodiments, the first blind holes 330 and the second blind holes 340 are structures in which multiple groups are alternately arranged on the substrate 10 along the first direction. For a single group of first blind holes 330, it can be a single hole structure in the third direction or a partition hole 3310 structure. It should be noted that the third direction is the width direction of the substrate 10 based on the first direction and the second direction, that is, the first direction, the second direction, and the third direction are perpendicular to each other in pairs. In order to reduce the drilling difficulty of large-sized blind holes and improve the structural strength of the blind hole area in the folding area 30, in a specific embodiment of the present invention, a single group of first blind holes 330 includes a plurality of partition holes 3310 arranged at intervals in the third direction, and the distance between two adjacent partition holes 3310 in a single group of first blind holes 330 is 30 μm - 300 μm, so as to leave enough structural area to maintain the strength of the folding area 30 while maintaining the density of the partition holes 3310. It should be noted that the specific structure of the second blind holes 340 is the same as that of the first blind holes 330 and will not be described in detail here.

[0056] Regarding the strengthening layers provided on the first surface 310 and the second surface 320, taking the first surface 310 as an example for illustration, the strengthening layer is a layered structure, that is, the strengthening layer provided on the first surface 310 mainly includes a first strengthening layer 3510, a second strengthening layer 3520, and a third strengthening layer 3530. Among them, the first strengthening layer 3510 is a flexible material layer and is filled in a partial area of the first blind hole 330, that is, the first strengthening layer 3510 is an independent layer structure provided in each first blind hole 330 to increase the ductility and compressive resistance of the first blind hole 330; while the second strengthening layer 3520 cooperates with the first strengthening layer 3510 through its partial area to completely fill the first blind hole 330 and at the same time block the first blind hole 330, and other areas of the second strengthening layer 3520 are located outside the first blind hole 330 and extend to the first surface 310, that is, the second strengthening layer 3520 is an integral structure and protrudes to provide a plurality of convex areas to extend into and fill a plurality of first blind holes 330. It should be noted that the flexibility of the second strengthening layer 3520 is greater than that of the first strengthening layer 3510, and it has good adhesion, heat resistance, and ductility; while the third strengthening layer 3530 is completely located outside the first blind hole 330, and the third strengthening layer 3530 is provided with a flexible strengthening film to cover and protect the second strengthening layer 3520 and paste and bend the substrate 10, so as to effectively fix the first strengthening layer 3510 and the second strengthening layer 3520. During the bending process of the folding area 30, the bending force is gradually transmitted and unloaded layer by layer by the third strengthening layer 3530, the second strengthening layer 3520, the first strengthening layer 3510, and the bent substrate 10 to achieve a stable bending effect.

[0057] In addition, in some embodiments of the present invention, the opening area of one or more of the first blind hole 330 and the second blind hole 340 is set to an outwardly expanding horn configuration to have a greater expansion or contraction margin during the folding process and improve the bending strength at the opening position of the blind hole.

[0058] Furthermore, as Figures 6 - 11 shown, the embodiments of the present invention also provide a method for preparing a double-sided foldable glass for preparing the double-sided foldable glass product provided in any of the above embodiments. Specifically, the preparation method at least includes the following steps:

[0059] S01: Partitioning: A substrate with a first preset thickness is partitioned into a through-hole area and a folding area. The folding area is located between the two through-hole areas. The two sides of the folding area in its thickness direction are respectively defined as the first surface and the second surface, and positioning marks are set in the through-hole area.

[0060] It should be noted that in step S01, the first preset thickness is 0.1 mm - 1.0 mm so that the preparation method can process a relatively thick substrate 10; and setting the mark positioning marks is to set reference points or optical positioning points on the substrate 10 to provide an accurate positioning reference for the automated processing equipment during the processing to ensure that the substrate 10 can be accurately placed at a predetermined position.

[0061] S02: First laser treatment: The through-hole area and the folding area are laser-modified. The through-hole area is processed to form through-holes according to the graphic requirements, and the first surface and the second surface of the folding area are subjected to depth modification treatment of the concave structure. After modification, the first surface and the second surface are uniformly recessed from both sides to the middle.

[0062] It should be noted that in step S02, during the laser treatment of the folding area 30, preferably, the set paths of the laser on the first surface 310 and the second surface 320 are in a fan-shaped structure to process the first surface 310 and the second surface 320 into an arc surface structure.

[0063] S03: First etching: Using one or more of an alkaline solution and an acidic solution, the substrate after the first laser treatment is etched. The laser-treated area of the through-hole area is etched into a through-hole structure, and the first surface and the second surface of the folding area are respectively etched into a smooth and continuous concave structure.

[0064] In step S03, further treatment of the substrate 10 with an alkaline solution and an acidic solution can smoothly trim the substrate 10 after the laser treatment. Among them, the acidic etching solution usually contains fluoride compounds containing fluoride ions such as hydrofluoric acid (HF) and ammonium fluoride (NH 4 F), and it dissolves silicon dioxide through the complexing action of fluoride ions to etch the substrate 10; while the alkaline etching solution usually uses sodium hydroxide (NaOH), ammonium hydroxide (NH4 OH), etc., to chemically react with the material to form soluble salts and complete the etching. Among them, the acid solution has stronger corrosiveness and a faster etching process, while the etching rate of the alkaline solution is slower, which is suitable for short-term etching before forming. For the treatment of the substrate 10, different etching methods can be selected according to the production conditions.

[0065] It should be further noted that in the preparation method provided in the embodiment of the present invention, the laser treatment process of the substrate 10 is only a modification treatment to improve the etching rate of the local area on the substrate 10, so as to facilitate the subsequent processing of the through holes or arc surface structures by the etching solution on the substrate 10.

[0066] S04: Secondary laser treatment: Laser drilling is respectively performed on the first surface and the second surface of the folding area to generate a plurality of first blind holes and second blind holes arranged in a staggered manner.

[0067] It should be noted that for the folding area 30 on the substrate 10, after the depression treatment is completed, the first blind hole 330 and the second blind hole 340 are opened to avoid the problem of high defective product rate caused by abnormal corrosion. Therefore, after steps S02 and S03 are completed, only the first surface 310 and the second surface 320 with a depressed area are formed in the folding area 30. At the same time, after step S03 is completed, step S04 is executed to roughly form the first blind hole 330 and the second blind hole 340 through secondary laser treatment, and the etching treatment is performed again through the following step S05. It should also be noted that when the substrate 10 performs step S04, its position is obtained through the mark positioning mark for automatic setting to ensure the accuracy of the secondary laser treatment process.

[0068] S05: Secondary etching: The substrate is subjected to secondary etching, and the first blind hole and the second blind hole formed by the secondary laser treatment are formed into blind hole structures with an outwardly expanding opening, and the through holes in the through hole area are formed into a preset specification.

[0069] It should be noted that in step S05, the solution for etching the substrate 10 is an alkaline solution such as sodium hydroxide or potassium hydroxide to improve the etching accuracy and prevent the over-etching problem caused by too fast a rate.

[0070] Further, in the preparation method disclosed in the above embodiments, in step S04, a plurality of first blind holes 330 and second blind holes 340 arranged in a staggered manner are generated by laser drilling. Here, the staggered arrangement specifically means that two adjacent blind holes in the first direction are respectively a first blind hole 330 and a second blind hole 340. At the same time, when looking down at the first surface 310 or the second surface 320 in the second direction, two adjacent first blind holes 330, or two adjacent second blind holes 340 are also arranged in a crosswise manner. Taking the first blind holes 330 on the first surface 310 as an example, if a single group of first blind holes 330 is a single hole, it can be arranged in an up-and-down offset manner. And if a single group of first blind holes 330 is multiple, a structure of three, four, three can be realized in the first direction to achieve crosswise arrangement. The staggered first blind holes 330 and second blind holes 340 can further balance the structural strength and folding performance of the folding area 30, thereby improving the service life of the substrate 10.

[0071] In addition, the first blind holes 330 and the second blind holes 340 being formed into a blind hole structure with an outwardly expanding opening can enhance the folding strength of the blind holes. In the preparation method provided in the embodiments of the present invention, the outer diameter of the opening area of the first blind holes 330 and the second blind holes 340 is 50 μm - 500 μm. And in order to avoid excessive damage to the structure of the folding area 30 by the blind holes, in the area of the folding layer where the blind holes are opened, the material thickness at the bottom of the blind holes still accounts for 20% - 40% of the minimum thickness of the folding area 30, that is, 20 μm - 80 μm. At the same time, for the blind hole structure, if a single group of first blind holes 330 or second blind holes 340 is provided with a partition hole 3310 structure, the distance between two adjacent partition holes 3310 in a single group of blind holes is 30 μm - 300 μm, and the distance between an adjacent group of first blind holes 330 and second blind holes 340 in the first direction is 30 μm - 100 μm.

[0072] It should be noted that the thickness of the substrate 10 after being processed by step S05 is 0.05 mm - 0.9 mm, and the thickness of the folding area 30 is 20 μm - 300 μm, which is usually 33% - 66% of the thickness of the through-hole area 20 structure; more preferably, the thickness of the folding area 30 is 50 μm - 150 μm.

[0073] It should be further noted that, in the above embodiments, the measurement methods for the aperture and width can be methods such as two-dimensional measurement and scanning electron microscope (SEM), etc., and the measurement of the hole depth or the thickness of the groove body can be sectional two-dimensional measurement, SEM measurement or step gauge, etc.

[0074] Further, on the basis of the above embodiments, after step S05 is completed, the preparation method provided by the embodiments of the present invention can further have the following steps:

[0075] S06: Post-treatment: The substrate after secondary etching is basket-tempered to achieve tempering treatment of the through-holes and blind holes, and the first surface and the second surface of the folding area are covered by a masking film.

[0076] It should be noted that for basket tempering, a special steel mesh is designed according to the size and layout of the through-holes and blind holes to fill the required structural layers in the through-holes, so as to enhance the strength of the folding area 30 and the through-hole area 20. The surface stress of the treated substrate 10 is greater than 450 Mpa. The masking film is provided on the first surface 310 and the second surface 320 for protecting the first surface 310 and the second surface 320, so as to achieve subsequent separate treatment of the through-hole area 20.

[0077] S07: Through-hole area treatment: The through-holes in the through-hole area are metallized by one or both of chemical deposition and physical deposition.

[0078] It should be noted that through-hole metallization can be achieved by electroplating, evaporation plating, and physical filling, and metal (usually copper) is deposited in the through-holes to meet the subsequent connection and display requirements.

[0079] S08: Folding area treatment: Remove the masking film on the folding area, first fill the first flexible strengthening layer into the first blind hole and the second blind hole, then add the second strengthening layer partially extending into the blind holes, and then set the third strengthening layer covering the second strengthening layer and in a continuous state.

[0080] S09: Grinding: Grind the surface of the substrate to make the substrate intermediate for the foldable glass product.

[0081] It should be noted that in step S08, the first strengthening layer 3510 is a flexible epoxy resin or polyurethane resin, and fills 20%-40% of the depth of the blind hole to enhance the ductility and compressive capacity of the blind hole area. The tensile strength of the first strengthening layer 3510 is 5 Mpa - 10 Mpa, its elongation rate is greater than 50% and its heat resistance capacity is greater than 130 °C; the flexibility of the second strengthening layer 3520 is greater than that of the first strengthening layer 3510, and it can be silicone resin, silicone-modified polyurethane resin, silicone-modified acrylate resin, etc. The second strengthening layer 3520 fills the remaining area of the blind hole, that is, 60%-80% of the depth of the blind hole. It should be noted that the tensile strength of the second strengthening layer 3520 is 1 Mpa - 5 Mpa, its elongation rate is greater than 100% and its heat resistance capacity is greater than 250 °C. On this basis, the third strengthening layer 3530 is a flexible strengthening film to cover the second strengthening layer 3520 and paste the bending substrate 10. It should be noted that the third strengthening layer 3530, as an outer protective layer, has a stronger tensile strength. Specifically, the tensile strength of the third strengthening layer 3530 is 60 Mpa - 100 Mpa, the elongation rate is greater than 50% and the heat resistance capacity is greater than 220 °C. At the same time, the thickness of the third strengthening layer 3530 is 25 μm - 50 μm. The setting of the three strengthening layers can ensure the heat resistance, corrosion resistance and ductility of the folding area 30, and well absorb the pressure during the bending process of the folding area 30, improving the mechanical properties of the folding area 30.

[0082] The above embodiments can realize the preparation of the double-sided bending substrate 10, and obtain the substrate 10 with a thickness of 0.05 mm - 0.9 mm through the setting of the blind hole and the strengthening layer, and the bending radius of the substrate 10 reaches 1 mm - 3 mm, and the number of bending times is not less than 300,000 times.

[0083] Furthermore, in a specific embodiment of the present invention, the substrate 10 is prepared by the above preparation method, and the preparation process is specifically as follows:

[0084] S101: Obtain a glass substrate with a thickness of 0.4 mm, ultrasonically clean the substrate, and adjust the laser pulse energy and pulse duration to perform double-sided laser fan-shaped modification on the area set as the folding area on the substrate to form a structure with the modification depth gradually increasing from the set through-hole area to the folding area. After reaching the central area of the folding area, the modification depth gradually decreases towards the through-hole area on the other side of the folding area, forming a modified structure with the maximum modification depth at the center of the folding area and a fan shape on both the first surface and the second surface on both sides. The through-hole area is laser drilled according to the drawing requirements and mark labels are set.

[0085] S102: Etch the through-holes of the substrate with hydrofluoric acid (HF), and vertically insert the folding area of the substrate into a basket to soak the through-holes with HF solution until the depth reaches 0.340 mm; the inner diameter of the through-hole area is processed to 10 μm, and the outer diameter is processed to 61 μm; the folding area forms a double-sided arc surface, and the thickness of the thinnest area is 130 μm.

[0086] S103: Perform the second laser drilling on the substrate after ultrasonic cleaning: Obtain the position of the substrate from the mark positioning label, and perform double-sided cross blind hole opening on the folding area. Similarly, for the opening of the blind holes, the modified depth also gradually decreases from the through-hole area to the folding area, and after reaching the central area of the folding area, the modified depth gradually increases from the folding area to the through-hole area on the other side; at the central position of the folding area, that is, the thinnest area on the substrate, the preset laser modification depth is 65 μm. At the same time, the single group of blind holes in the central area of the folding area is set as a three-row partition hole structure, and the number of single holes on both sides in the first direction gradually increases, so that the blind hole structure on the single side surface forms a trend of small holes in the center and wide holes on both sides, which is beneficial for bending.

[0087] It should be noted that for the blind hole structure, the single hole spacing is 15 μm, the light spot is 15 μm, the length of the single group of blind holes is 4 mm, for the initial group of blind holes in the central area of the folding area, the spacing between adjacent two partition holes within the single group is 70 μm, in the first direction, on the first surface or the second surface, the spacing between adjacent two groups of blind holes is 215 μm, and at the same time, it increases by 30 μm for every two groups from the folding area to the through-hole area. The first surface and the second surface are arranged side by side and misaligned in 24 groups.

[0088] S104: Use potassium hydroxide (KOH) solution to perform the second through-hole on the substrate, the substrate thickness is processed to 0.3 mm, the inner diameter of the through-hole in the through-hole area is processed to 55 μm, and the outer diameter is processed to 102 μm; the thinnest part of the central thickness of the folding area is processed to 90 μm, the thickness of the folding area material at the bottom of the blind hole is 27 μm, and the outer flaring aperture of the single group of blind holes in the central area of the folding area is 115 μm.

[0089] S105: After ultrasonic cleaning the substrate, perform tempering. Vertically insert the folding area into a basket, the tempering surface stress depth is 11.3 μm, and the surface stress after tempering reaches 570 Mpa.

[0090] S106: Select a UV dissociation film to perform double-sided masking treatment on the folding area of the substrate.

[0091] S107: Perform hole metallization on the through-hole area: Accurately position by the mark label, use the inkjet printing method, and accurately inject metal conductive glue into the holes by a micro nozzle and vacuum hot press for curing. The selected conductive glue is nano copper paste.

[0092] S108. Remove the masking film in the folding area, fill and cure the blind holes on the first surface and the second surface with epoxy resin and silicone-modified polyurethane resin. The filling method is the same as that of hole metallization, and the curing method uses ultraviolet curing; then attach a polyimide reinforced film.

[0093] S109. Bend with a bending radius of 2 mm and conduct 300,000 bending tests.

[0094] Thus, the preparation of the substrate 10 in this embodiment is completed.

[0095] The terms "first", "second", "left side", and "right side" in the description, claims, and above-mentioned drawings of the present invention are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may include unlisted steps or units.

[0096] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A double-sided folding glass product, characterized in that: The substrate comprises a substrate, wherein the substrate comprises through-hole areas arranged at intervals in a first direction, and a folding area arranged between two adjacent through-hole areas, wherein the through-hole areas are provided with a through-hole structure treated with metallization according to graphic requirements; The folding area includes a first surface and a second surface which are arranged opposite to each other in a second direction and are recessed toward each other. The folding area is provided with a first blind hole and a second blind hole in the second direction. The opening of the first blind hole is located on the first surface, and the opening of the second blind hole is located on the second surface. The first blind holes and the second blind holes are alternately arranged in a plurality of groups in the folding area along the first direction. The first surface and the second surface are respectively provided with strengthening layers, and partial areas of the strengthening layers are filled with the blind holes.

2. The double-sided folding glass product according to claim 1, characterized in that: The first surface and the second surface are both arc-shaped concave areas, and the lowest points of the first surface and the second surface are both located at the midpoint of the folding area in the first direction.

3. The double-sided folding glass product according to claim 1, characterized in that: The minimum thickness of the folding zone is not less than 50 μm, and the depth of the first blind hole accounts for 60%-80% of the thickness of the corresponding position of the folding zone.

4. The double-sided folding glass product according to claim 1, characterized in that: A single group of the first blind holes includes a plurality of separation holes arranged at intervals, and a distance between two adjacent separation holes in a single group of the first blind holes is 30 μm-300 μm.

5. The double-sided folding glass product according to claim 1, characterized in that: The strengthening layer arranged on the first surface includes a first strengthening layer, a second strengthening layer and a third strengthening layer, the first strengthening layer is a flexible layer and fills the bottom of the first blind hole, the second strengthening layer blocks the first blind hole and extends to the first surface, and the third strengthening layer is completely located outside the first blind hole and covers the second strengthening layer.

6. The double-sided folding glass product according to claim 1, characterized in that: The opening area of ​​the first blind hole and / or the second blind hole is in an outwardly expanding trumpet configuration.

7. A method for preparing double-sided folding glass, characterized in that: For preparing the double-sided folding glass product according to any one of claims 1 to 6, the preparation method comprises at least the following steps: Partitioning: dividing a substrate having a first preset thickness into a through-hole area and a folding area, wherein the folding area is located between the two through-hole areas, and the two sides of the folding area in the thickness direction are respectively defined as the first surface and the second surface, and positioning marks are provided in the through-hole area; One laser treatment: laser modification of the through-hole area and the folding area. The through-hole area is processed according to the graphic requirements. The first surface and the second surface of the folding area are deeply modified with a concave structure. The modified first surface and the second surface are evenly concave from both sides to the middle. Primary etching: etching the substrate after the primary laser treatment using alkaline solution and / or acid solution, wherein the laser-treated area of ​​the through-hole area is etched into a through-hole structure, and the first surface and the second surface of the folding area are respectively etched into smooth and continuous concave structures; Secondary laser processing: pre-opening the first surface and the second surface of the folding area by laser to generate a plurality of staggered first blind holes and second blind holes; Secondary etching: The substrate is subjected to secondary etching, and the first blind hole and the second blind hole processed by the secondary laser are formed into a blind hole structure with an opening expanding outward, and the through holes in the through hole area are formed into preset specifications.

8. The preparation method according to claim 7, characterized in that: After the secondary etching step, the method further comprises the following steps: Post-processing: The secondary etched substrate is tempered by inserting a basket to achieve tempering of the through holes and blind holes, and the first surface and the second surface of the folding area are masked by a masking film; Through-hole area processing: metallizing the through-holes in the through-hole area by chemical deposition and / or physical deposition; Folding area treatment: remove the masking film on the folding area, fill the first blind hole and the second blind hole with the flexible first reinforcement layer, then add the second reinforcement layer partially extending into the blind hole, and then set the third reinforcement layer in a continuous state covering the second reinforcement layer; Polishing: The surface of the substrate is polished to make the substrate intermediate piece of the foldable glass product.

9. The preparation method according to claim 7, characterized in that: In the secondary etching step, the etching solution is an alkaline sodium hydroxide or potassium hydroxide solution.

10. The preparation method according to claim 7, characterized in that: In the one etching step, the minimum thickness of the folding area after etching is 50 μm-200 μm, and the thickness of the folding area is processed to be 33%-66% of the thickness of the through-hole area.

11. The preparation method according to claim 8, characterized in that: In the folding area processing step, the first reinforcement layer is a flexible epoxy resin or polyurethane resin, and fills 20%-40% of the depth of the blind hole; the second reinforcement layer is a silicone resin or silicone-modified polyurethane resin with greater flexibility than the first reinforcement layer, and the second reinforcement layer fills the blind hole and partially overflows the blind hole; the third reinforcement layer is a flexible reinforcement film and its thickness is 25μm-50μm.

12. The preparation method according to claim 7, characterized in that: In the secondary etching step, the aperture of the opening area of ​​the first blind hole and the second blind hole is 50μm-500μm, the thickness of the folding area at the bottom of the blind hole is 20μm-80μm, and the spacing between adjacent first blind holes and second blind holes is 30μm-100μm.

13. The preparation method according to claim 7, characterized in that: The first preset thickness is 0.1 mm-1.0 mm.

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