Hot pressing equipment and method for ultrathin flexible glass and thermoplastic polymer film

Abstract

The invention discloses hot pressing equipment and method for ultrathin flexible glass and a thermoplastic polymer film. The hot pressing equipment comprises an upper pressing mechanism and a lower pressing mechanism which are opposite to each other up and down and are symmetrically arranged, each of the upper press-fit mechanism and the lower press-fit mechanism comprises a heating platform, a graphene soaking layer, a metal pressing plate layer, a first buffer layer and a second buffer layer which are sequentially laminated, and the second buffer layers are located on the inner sides of the upper press-fit mechanism and the lower press-fit mechanism. The high-frequency heater is used for heating the heating platform, and rapid temperature rise can be achieved; the graphene soaking 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 made to be fast and uniform through heat diffusion of the graphene soaking layer, the uniformity of the temperature of all pressing points of a product is ensured, and then the uniformity of hot pressing is improved; through the low-hardness first buffer layer and the high-hardness second buffer layer, UTG is prevented from being broken in the pressing process, and it is ensured that the surface of a pressed product is smooth and free of concave-convex.

Description

Technical Field

[0001] The invention relates to the technical field of heat pressing, and in particular to a heat pressing device and method for ultra-thin flexible glass and a thermoplastic polymer film. Background Art

[0002] Vacuum hot pressing is a technology that combines vacuum technology with hot pressing principles. It is mainly used to process and shape materials under high temperature and vacuum environment. In the field of electronic manufacturing, it is widely used for bonding glass, silicon wafers, wafers, etc.

[0003] For the lamination 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 the thermoplastic polymer film is less than or equal to 30 microns, due to the influence of factors such as the parallel accuracy of the upper and lower platforms of the equipment, material thickness error, platform temperature difference, etc., pinhole-shaped bubbles are likely to appear after the product is pressed, and there are problems such as local incomplete pressing and UTG cracking.

[0004] Therefore, it is of great significance to research and develop a hot pressing device and method suitable for UTG and thermoplastic polymer film to solve the problems of uneven pressing and TUG rupture. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a device and method for hot pressing of ultra-thin flexible glass and thermoplastic polymer film. A high-frequency heater is used to heat the heating platform to achieve rapid heating. A graphene heat-averaging layer is arranged between the heating platform and the metal pressing plate layer. Heat is diffused through the graphene heat-averaging layer to make the temperature rapidly uniform, thereby improving the uniformity of hot pressing. A low-hardness first buffer layer and a high-hardness second buffer layer are used to prevent the UTG from breaking during the pressing process and ensure that the surface of the pressed product is smooth and has no bumps.

[0006] In order to solve the above technical problems, the present invention provides, on the one hand, a hot pressing device for ultra-thin flexible glass and thermoplastic polymer film, comprising an upper pressing mechanism and a lower pressing mechanism that are symmetrically arranged opposite to each other, the upper pressing mechanism and the lower pressing mechanism both comprising a heating platform, a graphene heat-spreading layer, a metal pressure plate layer, a first buffer layer and a second buffer layer that are sequentially stacked, wherein the second buffer layer is located on the inner side of the upper pressing mechanism and the lower pressing mechanism.

[0007] The present invention realizes rapid heat diffusion through the graphene heat-averaging layer, so that the temperature of the heating platform and the metal pressing plate layer is quickly uniform, ensuring the consistency of the temperature of each pressing point of the product, thereby improving the uniformity of hot pressing; through the low-hardness first buffer layer and the high-hardness second buffer layer, the UTG is prevented from breaking during the pressing process and the surface of the pressed product is ensured to be flat and without bumps.

[0008] Furthermore, 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] Furthermore, the first buffer layer is a silicone buffer pad with a Shore hardness of 30-50 degrees and a thickness of 4-10 mm. The low-hardness silicone buffer pad is used as an intermediate buffer layer to prevent the UTG from breaking during the pressing process.

[0010] Furthermore, the second buffer layer is a silicone buffer pad with a Shore hardness of 50-70 degrees and a thickness of 2-5 mm. The high-hardness silicone buffer pad is used as the contact surface for product pressing to avoid uneven defects on the surface of the product while ensuring the pressing of the product.

[0011] Furthermore, the heating platform is heated by a high-frequency heater with a fast heating rate, and can be heated to 200° C. within 5 minutes, greatly improving the heating rate.

[0012] Furthermore, the heating platform includes a steel plate, which has a low heat treatment deformation rate, strong rigidity, stable performance and long service life. The surface of the steel plate is galvanized to improve the corrosion resistance and life of the heating platform. The flatness of the heating platform is ±0.01mm, which improves the heating accuracy and uniformity and avoids the problem of local uneven pressing of the product.

[0013] Furthermore, the thickness of the graphene heat-dissipating layer is 25-100 μm, and the graphene heat-dissipating layer can achieve rapid heat diffusion, making the temperature quickly uniform, and further improving the uniformity of product pressing.

[0014] Furthermore, 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, which improves the pressing accuracy and uniformity.

[0015] Furthermore, the upper pressing mechanism and the lower pressing mechanism are placed in a switchable shell, and the shell is connected to a vacuum system, and the closed shell is evacuated by the vacuum system to ensure that the pressing is performed in a low-pressure oxygen-free environment.

[0016] The second aspect of the present invention provides a working method of the thermal compression bonding device of the ultra-thin flexible glass and the thermoplastic polymer film according to the first aspect, comprising the following steps:

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

[0018] S2, placing the ultra-thin flexible glass and the thermoplastic polymer film laminate disposed on both sides thereof on the second buffer layer of the lower pressing mechanism, and pressing the upper pressing mechanism downward until it is closed with the lower pressing mechanism;

[0019] S3. Close the shell and evacuate the air through the vacuum system within 20 seconds until the vacuum degree is less than -101.2 kPa;

[0020] S4, the upper pressing mechanism presses down, the pressure is 1-10kg / cm 2 The holding time is 5-15 minutes to complete the hot pressing of the ultra-thin flexible glass and the thermoplastic polymer film.

[0021] Furthermore, after S4, it also includes: quickly cooling the heating platform to below 80° C. by cooling oil, opening the shell after breaking the vacuum, resetting the upper pressing mechanism, and taking out the product.

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

[0023] Beneficial effects of the present invention:

[0024] The present invention adopts a high-frequency heater to heat the heating platform, which can achieve rapid heating; a graphene heat-averaging layer is arranged between the heating platform and the metal pressing plate layer, and heat is diffused by the graphene heat-averaging layer to make the temperature of the metal pressing plate layer and the heating platform quickly uniform, thereby ensuring the uniformity of the temperature of each pressing point of the product, thereby improving the uniformity of hot pressing; through the low-hardness first buffer layer and the high-hardness second buffer layer, the UTG is prevented from breaking during the pressing process and the surface of the pressed product is ensured to be flat and without bumps. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic structural diagram of a thermal pressing device for ultra-thin flexible glass and thermoplastic polymer film of the present invention;

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

[0028] The technical solution of the present invention will be described clearly and completely below in conjunction with the specific embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Reference Figure 1 As shown, this embodiment provides a thermal pressing device for ultra-thin flexible glass and thermoplastic polymer film, including an upper pressing mechanism A and a lower pressing mechanism B that are symmetrically arranged in a vertically opposite manner, wherein the upper pressing mechanism A and the lower pressing mechanism B both include a heating platform 1, a graphene heat-spreading layer 2, a metal pressing plate layer 3, a first buffer layer 4, and a second buffer layer 5 that are sequentially stacked, wherein 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 heat-spreading layer 2 realizes rapid heat diffusion, ensures that the temperature of the heating platform 1 and the metal pressing plate layer 3 is rapidly uniform, thereby achieving consistency in the temperature of each pressing point of the product, thereby improving the uniformity of the thermal pressing of the product; the first buffer layer 4 with low hardness is used to prevent the cracking of UTG during the pressing process, and the second buffer layer 5 with high hardness is used to contact and press the product, ensuring that the surface of the pressed product is flat and has no bumps.

[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 silicone buffer pad with a Shore hardness of 30-50 degrees and a thickness of 4-10mm. The low-hardness silicone buffer pad is used as an intermediate buffer layer to prevent the UTG from breaking during the lamination process; the second buffer layer 5 is a silicone buffer pad with a Shore hardness of 50-70 degrees and a thickness of 2-5mm. The high-hardness silicone buffer pad is used as the contact surface for product lamination to avoid causing concave and convex defects on the surface of the product while ensuring the lamination of the product.

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

[0033] As a preferred embodiment, the heating platform 1 includes a steel plate with a low heat treatment deformation rate, strong 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 ±0.01mm, which improves the heating accuracy and uniformity and avoids the problem of local uneven pressing of the product; the material of the metal pressure plate layer 3 is Q235 steel plate, the thickness of the metal pressure plate layer 3 is 2-5mm, and the flatness is ±0.01mm, which improves the pressing accuracy and uniformity.

[0034] As a preferred embodiment, the thickness of the graphene heat-dissipating layer 2 is 25-100 μm. The graphene heat-dissipating layer 2 can achieve rapid heat diffusion, make the temperature quickly uniform, and further improve the uniformity of product pressing.

[0035] As a preferred embodiment, the upper pressing mechanism A and the lower pressing mechanism B are placed in a switchable shell 6, and the shell 6 is connected to a vacuum system. The closed shell 6 is evacuated 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 thermal compression bonding device for ultra-thin flexible glass and thermoplastic polymer film described in the above embodiment, comprising the following steps:

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

[0038] S2, placing the ultra-thin flexible glass and the thermoplastic polymer film laminate disposed on both sides thereof on the second buffer layer 5 of the lower pressing mechanism B, and pressing the upper pressing mechanism A downward until it is closed with the lower pressing mechanism B;

[0039] S3, close the housing 6, and evacuate the housing through the vacuum system within 20 seconds until the vacuum degree is less than -101.2 kPa;

[0040] S4, the upper pressing mechanism A presses down, the pressure is 1-10kg / cm 2 The holding time is 5-15 minutes to complete the hot pressing of the ultra-thin flexible glass and the thermoplastic polymer film.

[0041] As a preferred embodiment, after S4, it also includes: quickly cooling the heating platform 1 to below 80°C by cooling oil, opening the shell 6 after breaking the vacuum, resetting the upper pressing mechanism A, taking out the product, cooling it by cooling oil, and increasing 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 present invention uses a high-frequency heater to heat the heating platform, which can achieve rapid heating; a graphene heat-dissipating layer is arranged between the heating platform and the metal pressing plate layer, and the heat is diffused by the graphene heat-dissipating layer to make the temperature of the metal pressing plate layer and the heating platform quickly uniform, thereby ensuring the uniformity of the temperature of each pressing point of the product, thereby improving the uniformity of hot pressing; through the low-hardness first buffer layer and the high-hardness second buffer layer, the UTG is prevented from breaking during the pressing process and the surface of the pressed product is ensured to be flat and without bumps.

[0044] The present invention has been described in detail above in conjunction with specific implementations and exemplary examples, but these descriptions cannot be understood as limiting the present invention. Those skilled in the art understand that, without departing from the spirit and scope of the present invention, a variety of equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its implementation methods, all of which fall within the scope of the present invention. The scope of protection of the present invention shall be subject to the attached claims.

Claims

1. A thermal compression bonding device for ultra-thin flexible glass and thermoplastic polymer film, characterized in that: It includes an upper pressing mechanism and a lower pressing mechanism that are symmetrically arranged in an upper and lower direction, and the upper pressing mechanism and the lower pressing mechanism both include a heating platform, a graphene heat-spreading layer, a metal pressure plate layer, a first buffer layer and a second buffer layer that are sequentially stacked, wherein the second buffer layer is located on the inner side of the upper pressing mechanism and the lower pressing mechanism.

2. The thermal compression bonding device for ultra-thin flexible glass and thermoplastic polymer film according to claim 1, characterized in that: The first buffer layer is a silicone buffer pad with a Shore hardness of 30-50 degrees and a thickness of 4-10 mm.

3. The thermal compression bonding device for ultra-thin flexible glass and thermoplastic polymer film according to claim 1, characterized in that: The second buffer layer is a silicone buffer pad with a Shore hardness of 50-70 degrees and a thickness of 2-5 mm.

4. The thermal compression bonding device for ultra-thin flexible glass and thermoplastic polymer film according to claim 1, characterized in that: The heating platform is heated by a high frequency heater.

5. The thermal compression bonding device for ultra-thin flexible glass and thermoplastic polymer film according to claim 1, characterized in that: 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.

6. The thermal compression bonding device for ultra-thin flexible glass and thermoplastic polymer film according to claim 1, characterized in that: The thickness of the graphene heat-dissipating layer is 25-100 μm.

7. The thermal compression bonding device for ultra-thin flexible glass and thermoplastic polymer film according to claim 1, characterized in that: 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.

8. The thermal compression bonding device for ultra-thin flexible glass and thermoplastic polymer film according to claim 1, characterized in that: The upper pressing mechanism and the lower pressing mechanism are placed in a switchable housing, and the housing is connected to a vacuum system.

9. A method for operating the thermal compression bonding device for ultra-thin flexible glass and thermoplastic polymer film according to any one of claims 1 to 8, characterized in that: The steps include: S1, heating the heating platform to a preset temperature through a high-frequency heater; S2, placing the ultra-thin flexible glass and the thermoplastic polymer film laminate disposed on both sides thereof on the second buffer layer of the lower pressing mechanism, and pressing the upper pressing mechanism downward until it is closed with the lower pressing mechanism; S3. Close the shell and evacuate the air through the vacuum system within 20 seconds until the vacuum degree is less than -101.2 kPa; S4, the upper pressing mechanism presses down, the pressure is 1-10kg / cm 2 The holding time is 5-15 minutes to complete the hot pressing of the ultra-thin flexible glass and the thermoplastic polymer film.

10. The working method of the thermal compression bonding device for ultra-thin flexible glass and thermoplastic polymer film according to claim 9, characterized in that: After S4, the steps also include: rapidly cooling the heating platform to below 80° C. by means of cooling oil, opening the shell, resetting the upper pressing mechanism, and taking out the product.

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