An apparatus and method for hot pressing of ultra-thin flexible glass and thermoplastic polymer film

Abstract

The application discloses a kind of ultra-thin flexible glass and thermoplastic polymer film hot pressing equipment and method, including upper and lower opposite and symmetrically arranged upper pressing mechanism and lower pressing mechanism, the upper pressing mechanism and lower pressing mechanism all include sequentially laminated heating platform, graphene uniform heating layer, metal pressing plate layer, first buffer layer and second buffer layer, wherein, the second buffer layer is located in the inner side of upper pressing mechanism and lower pressing mechanism.The application uses high-frequency heater to heat the heating platform, which can achieve rapid heating;Graphene uniform heating layer is arranged between the heating platform and the metal pressing plate layer, and the temperature of the metal pressing plate layer and the heating platform is rapidly and uniformly distributed through the graphene uniform heating layer, ensuring the uniformity of the product pressing point temperature, and further improving the uniformity of hot pressing;Through the first buffer layer with low hardness and the second buffer layer with high hardness, the rupture of UTG during pressing is prevented, and the surface of the pressed product is smooth and flat.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hot pressing, in particular to a hot pressing equipment and method for ultra-thin flexible glass and thermoplastic polymer film. BACKGROUND

[0002] Vacuum hot pressing is a technology combining vacuum technology and hot pressing principle, mainly used for processing and forming materials in high temperature and vacuum environment, and widely used for bonding of glass, silicon wafer and wafer in the field of electronic manufacturing.

[0003] For the pressing of ultra-thin flexible glass (UTG) and thermoplastic polymer film, when the thickness of UTG is less than or equal to 100 microns and the thickness of thermoplastic polymer film is less than or equal to 30 microns, due to the influence of factors such as parallel precision of upper and lower platforms of the equipment, material thickness error and temperature difference of the platforms, pinhole-shaped bubbles are prone to appear after pressing of the product, there is a problem of incomplete pressing in some local areas, and UTG is prone to breakage.

[0004] Therefore, it is of great significance to develop a hot pressing equipment and method suitable for UTG and thermoplastic polymer film to solve the problems of uneven pressing and TUG breakage. SUMMARY

[0005] The present application provides a hot pressing equipment and method for ultra-thin flexible glass and thermoplastic polymer film, which uses a high-frequency heater to heat the heating platform, can realize rapid heating, sets a graphene heat uniform layer between the heating platform and the metal pressing plate layer, diffuses heat through the graphene heat uniform layer to make the temperature uniform rapidly, and improves the uniformity of hot pressing; through the first buffer layer with low hardness and the second buffer layer with high hardness, the breakage of UTG during pressing is prevented and the surface of the pressed product is ensured to be flat without concave-convex.

[0006] In order to solve the above technical problems, the present application provides a hot pressing equipment for ultra-thin flexible glass and thermoplastic polymer film, which comprises an upper pressing mechanism and a lower pressing mechanism arranged symmetrically and facing each other, and the upper pressing mechanism and the lower pressing mechanism each comprise a heating platform, a graphene heat uniform layer, a metal pressing plate layer, a first buffer layer and a second buffer layer arranged in sequence, wherein the second buffer layer is located on the inner side of the upper pressing mechanism and the lower pressing mechanism.

[0007] The present application realizes rapid diffusion of heat through the graphene heat uniform layer, makes the temperature of the heating platform and the metal pressing plate layer uniform rapidly, ensures the consistency of the temperature of each pressing point of the product, and further improves the uniformity of hot pressing; through the first buffer layer with low hardness and the second buffer layer with high hardness, the breakage of UTG during pressing is prevented and the surface of the pressed product is ensured to be flat without concave-convex.

[0008] Further, the thickness of the ultra-thin flexible glass is 10-100 μm, and the thickness of the thermoplastic polymer film is 10-30 μm.

[0009] Further, the first buffer layer is a silica gel buffer pad with a Shore hardness of 30-50 degrees and a thickness of 4-10 mm, and the low-hardness silica gel buffer pad is used as an intermediate buffer layer to prevent the UTG from being broken during the pressing process.

[0010] Further, the second buffer layer is a silica gel buffer pad with a Shore hardness of 50-70 degrees and a thickness of 2-5 mm, and the high-hardness silica gel buffer pad is used as a contact surface for product pressing to avoid causing concave-convex defects on the surface of the product and ensure the pressing of the product.

[0011] Further, the heating platform is heated by a high-frequency heater, and the heating rate is fast, and the temperature can be raised to 200 DEG C within 5 min, thereby greatly improving the heating rate.

[0012] Further, the heating platform comprises a steel plate, and the steel plate has low heat treatment deformation rate, high rigidity, stable performance and long service life, the surface of the steel plate is galvanized to improve the corrosion resistance and service life of the heating platform, and the flatness of the heating platform is ± 0.01 mm, thereby improving the heating precision and uniformity and avoiding the problem of local uneven pressing of the product.

[0013] Further, the thickness of the graphene uniform heating layer is 25-100 μm, and the graphene uniform heating layer is used to realize rapid diffusion of heat, so that the temperature is rapidly and uniformly distributed, and the uniformity of product pressing is further improved.

[0014] Further, the material of the metal pressing plate layer is a Q235 steel plate, and the thickness of the metal pressing plate layer is 2-5 mm, and the flatness is ± 0.01 mm, thereby improving the pressing precision and uniformity.

[0015] Further, the upper pressing mechanism and the lower pressing mechanism are arranged in a switchable shell, the shell is connected to a vacuum system, the closed shell is vacuumized by the vacuumizing system, and the pressing is ensured to be carried out in a low-pressure oxygen-free environment.

[0016] The second aspect of the application provides a working method of the ultra-thin flexible glass and thermoplastic polymer film hot pressing equipment of the first aspect, comprising the following steps:

[0017] S1, heating the heating platform to a preset temperature by a high-frequency heater;

[0018] S2, stacking the ultra-thin flexible glass and the thermoplastic polymer film arranged on both sides of the ultra-thin flexible glass on the second buffer layer of the lower pressing mechanism, and pressing the upper pressing mechanism to close the lower pressing mechanism;

[0019] S3, close the shell, and vacuumize to less than -101.2 kPa within 20 s through a vacuum system;

[0020] S4, the upper pressing mechanism is pressed down, the pressure is 1-10 kg / cm 2 , the pressure maintaining time is 5-15 min, and the hot pressing of the ultra-thin flexible glass and the thermoplastic polymer film is completed.

[0021] Further, S4 further comprises: rapidly cooling the heating platform to below 80 DEG C through cooling oil, opening the shell after breaking the vacuum, resetting the upper pressing mechanism, and taking out the product.

[0022] Further, the preset temperature is set according to the curing temperature of the thermoplastic polymer film.

[0023] The beneficial effects of the present application are:

[0024] The present application adopts a high-frequency heater as a heating platform to heat, which can realize rapid heating; a graphene heat-diffusing layer is arranged between the heating platform and the metal pressing plate layer, the temperature of the metal pressing plate layer and the heating platform is rapidly and uniformly diffused through the graphene heat-diffusing layer, the uniformity of the product at each pressing point is ensured, and the uniformity of the hot pressing is further improved; the first buffer layer with low hardness and the second buffer layer with high hardness prevent the UTG from being broken during pressing and ensure that the surface of the pressed product is flat and free of concave-convex. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the present application, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1 is a structural schematic view of the hot pressing equipment of the ultra-thin flexible glass and the thermoplastic polymer film of the present application;

[0027] Explanation of reference numerals in the drawing: A, upper pressing mechanism, B, lower pressing mechanism, 1, heating platform, 2, graphene heat-diffusing layer, 3, metal pressing plate layer, 4, first buffer layer, 5, second buffer layer, 6, shell. DETAILED DESCRIPTION

[0028] The technical solutions of the present application will be described in detail below with reference to specific embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0029] ReferenceFigure 1 As shown in the embodiment, the present embodiment provides a hot pressing equipment for ultra-thin flexible glass and thermoplastic polymer film, which comprises an upper pressing mechanism A and a lower pressing mechanism B arranged symmetrically and facing each other. The upper pressing mechanism A and the lower pressing mechanism B each comprise a heating platform 1, a graphene uniform heating layer 2, a metal pressing plate layer 3, a first buffer layer 4 and a second buffer layer 5 arranged sequentially in layers. The second buffer layer 5 is located on the inner side of the upper pressing mechanism A and the lower pressing mechanism B. In this embodiment, the graphene uniform heating layer 2 realizes rapid diffusion of heat, ensures rapid and uniform temperature of the heating platform 1 and the metal pressing plate layer 3, and further realizes consistency of temperature at each pressing point of the product, thereby improving the uniformity of hot pressing of the product. The first buffer layer 4 with low hardness prevents the UTG from being broken during pressing, and the second buffer layer 5 with high hardness contacts and presses the product, ensuring that the surface of the pressed product is flat without concave-convex.

[0030] As a preferred embodiment, the thickness of the ultra-thin flexible glass is 10-100 μm, and the thickness of the thermoplastic polymer film is 10-30 μm.

[0031] As a preferred embodiment, the first buffer layer 4 is a silica gel buffer pad with a Shore hardness of 30-50 degrees and a thickness of 4-10 mm. The silica gel buffer pad with low hardness is used as an intermediate buffer layer to prevent the UTG from being broken during pressing. The second buffer layer 5 is a silica gel buffer pad with a Shore hardness of 50-70 degrees and a thickness of 2-5 mm. The silica gel buffer pad with high hardness is used as a contact surface for pressing the product, avoiding concave-convex defects on the surface of the product and ensuring pressing of the product.

[0032] As a preferred embodiment, the heating platform 1 is heated by a high-frequency heater, which has a fast heating rate and can be heated to 200°C within 5 minutes, greatly improving the heating rate.

[0033] As a preferred embodiment, the heating platform 1 comprises a steel plate, which has low heat treatment deformation rate, high rigidity, stable performance and long service life. The surface of the steel plate is galvanized to improve the corrosion resistance and service life of the heating platform 1. The flatness of the heating platform 1 is ±0.01 mm, which improves the heating precision and uniformity and avoids local uneven pressing of the product. The material of the metal pressing plate layer 3 is Q235 steel plate, and the thickness of the metal pressing plate layer 3 is 2-5 mm with a flatness of ±0.01 mm, which improves the pressing precision and uniformity.

[0034] As a preferred embodiment, the thickness of the graphene uniform heating layer 2 is 25-100 μm. The graphene uniform heating layer 2 realizes rapid diffusion of heat, makes the temperature uniform rapidly, and further improves the uniformity of pressing of the product.

[0035] As a preferred embodiment, the upper pressing mechanism A and the lower pressing mechanism B are placed in a switchable housing 6, the housing 6 is connected to a vacuum system, and the closed housing 6 is vacuumized by the vacuum system to ensure that the pressing is performed in a low-pressure oxygen-free environment.

[0036] Another embodiment provides a working method of the hot pressing equipment for the ultra-thin flexible glass and the thermoplastic polymer film according to the above-mentioned embodiments, which comprises the following steps:

[0037] S1, heating the heating platform 1 to a preset temperature by a high-frequency heater;

[0038] S2, placing the stack of the ultra-thin flexible glass and the thermoplastic polymer films arranged on both sides of the ultra-thin flexible glass on the second buffer layer 5 of the lower pressing mechanism B, and pressing the upper pressing mechanism A to close with the lower pressing mechanism B;

[0039] S3, closing the housing 6, and vacuumizing the housing 6 to a vacuum degree less than -101.2 kPa within 20 s by a vacuum system;

[0040] S4, pressing the upper pressing mechanism A, the pressure being 1-10 kg / cm 2 , the pressure maintaining time being 5-15 min, and the hot pressing of the ultra-thin flexible glass and the thermoplastic polymer film being completed.

[0041] As a preferred embodiment, S4 further comprises: rapidly cooling the heating platform 1 to below 80℃ by cooling oil, opening the housing 6 after breaking the vacuum, resetting the upper pressing mechanism A, taking out the product, and cooling by the cooling oil to improve the cooling rate.

[0042] As a preferred embodiment, the preset temperature is set according to the curing temperature of the thermoplastic polymer film.

[0043] In summary, the heating platform is heated by a high-frequency heater, rapid heating can be realized; the graphene uniform heating layer is arranged between the heating platform and the metal pressing plate layer, the temperature of the metal pressing plate layer and the heating platform is rapidly and uniformly diffused by the graphene uniform heating layer, the uniformity of the product pressing points is ensured, and the uniformity of the hot pressing is improved; the first buffer layer with low hardness and the second buffer layer with high hardness are used to prevent the rupture of the UTG during pressing and ensure the flatness of the pressing product surface.

[0044] The above detailed description of the present application is made in combination with specific embodiments and exemplary examples, but these descriptions cannot be understood as limitations of the present application. Those skilled in the art understand that the technical solutions and embodiments of the present application can be variously replaced, modified or improved without deviating from the spirit and scope of the present application, and these all fall within the scope of the present application. The protection scope of the present application is subject to the appended claims.

Claims

1. A hot pressing device for bonding ultra-thin flexible glass and thermoplastic polymer film, characterized in that, The upper pressing mechanism and the lower pressing mechanism are vertically and symmetrically arranged, and each comprises a heating platform, a graphene uniform heating layer, a metal pressing plate layer, a first buffer layer and a second buffer layer which are sequentially stacked, wherein the second buffer layer is located at the inner side of the upper pressing mechanism and the lower pressing mechanism. The first buffer layer is a silica gel buffer pad with a Shore hardness of 30-50 degrees and a thickness of 4-10 mm, which prevents the UTG from being broken during the pressing process by using the low-hardness silica gel buffer pad as an intermediate buffer layer. The second buffer layer is a silica gel buffer pad with a Shore hardness of 50-70 degrees and a thickness of 2-5 mm, which avoids the concave-convex defects on the surface of the product and ensures the pressing of the product by using the high-hardness silica gel buffer pad as the contact surface of the product pressing. 2.The apparatus for thermal lamination of ultra-thin flexible glass and thermoplastic polymer film according to claim 1, wherein, The heating platform is heated by a high-frequency heater. 3.The apparatus of claim 1, wherein the apparatus further comprises a heating unit configured to heat the thermoplastic polymer film to a temperature of 100-300 ℃. The heating platform comprises a steel plate, the surface of the steel plate is galvanized, and the flatness of the heating platform is ±0.01 mm. 4.The apparatus for thermal lamination of ultra-thin flexible glass and thermoplastic polymer film according to claim 1, wherein, The thickness of the graphene uniform heating layer is 25-100 μm. 5.The apparatus for thermal lamination of ultra-thin flexible glass and thermoplastic polymer film according to claim 1, wherein, The material of the metal pressing plate layer is Q235 steel plate, the thickness of the metal pressing plate layer is 2-5 mm, and the flatness is ±0.01 mm. 6.The apparatus for thermal lamination of ultra-thin flexible glass and thermoplastic polymer film according to claim 1, wherein, The upper pressing mechanism and the lower pressing mechanism are arranged in a switchable shell, and the shell is connected to a vacuum system.

7. A method of operating the apparatus for heat-press bonding of the ultrathin flexible glass and the thermoplastic polymer film according to any one of claims 1 to 6, wherein The method comprises the following steps: S1, heating the heating platform to a preset temperature by a high-frequency heater; S2, placing the super-thin flexible glass and the thermoplastic polymer film arranged on both sides of the super-thin flexible glass in a stack on the second buffer layer of the lower pressing mechanism, and pressing the upper pressing mechanism to close the lower pressing mechanism; S3, closing the shell, and vacuumizing by the vacuum system within 20 s to a vacuum degree less than -101.2 kPa; S4, the upper pressing mechanism is pressed down, the pressure is 1-10 kg / cm 2 , the pressure holding time is 5-15 min, and the hot pressing of the ultra-thin flexible glass and the thermoplastic polymer film is completed. 8.The method of claim 7, wherein the method further comprises: after the heating, moving the first and second rollers apart from each other to a predetermined distance, and then moving the first and second rollers to the first and second positions, respectively. S4, further comprising: rapidly cooling the heating platform to below 80℃ by cooling oil, opening the shell, resetting the upper pressing mechanism, and taking out the product.

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