CN113665215A - UTG and CPI film multilayer material laminating and folding process - Google Patents
UTG and CPI film multilayer material laminating and folding process Download PDFInfo
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- CN113665215A CN113665215A CN202110775947.XA CN202110775947A CN113665215A CN 113665215 A CN113665215 A CN 113665215A CN 202110775947 A CN202110775947 A CN 202110775947A CN 113665215 A CN113665215 A CN 113665215A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/16—Drying; Softening; Cleaning
- B32B38/164—Drying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
- B32B2037/243—Coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B2038/0052—Other operations not otherwise provided for
- B32B2038/0076—Curing, vulcanising, cross-linking
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- Laminated Bodies (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a process for laminating and folding UTG and CPI film multilayer materials, which comprises the following specific steps: the method comprises the following steps: preparing a part A; step two: preparing a part B; step three: the hardening liquid is reduced in oxygen content by using an air-floating type heat drying oven and a UV lamp; step four: coating the hardening liquid on the polyimide film; step five: preparing a front polyimide hardened film; step six: the oxygen content of the OCA optical cement is reduced by using an oven and a UV lamp; step seven: coating OCA optical cement on the back of the polyimide film; step eight: the polyimide cured OCA film was bonded to UTG. According to the invention, CPI is adhered to UTG, so that the impact resistance of UTG can be enhanced, and UTG also becomes a hard bottom of the CPI on the upper layer, so that the defects that the CPI is too soft and is easy to scratch are overcome, and the original adhering mode of HC-CPI-OCA-UTG is changed into an integrating mode that an OCA coating tool bit is used for coating a CPI base film into a 5-um OCA coating and then adhering, so that the thickness of a layer of 20-um OCA can be reduced, the product performance is good, and the cost is low.
Description
Technical Field
The invention relates to the technical field of production of foldable cover plates with composite structures, in particular to a process for laminating and folding UTG and CPI film multilayer materials.
Background
There are still a number of drawbacks with current foldable covers, and the performance of foldable covers (scratch, impact, etc.) is not improved due to reliability issues. Due to the performance limitations of current foldable cover plates, many fine wrinkles and depressions appear on the surface of the cover plate after two more months of normal use. The basic requirements of a foldable cover plate include: scratch resistance, impact resistance and optical properties. This is also a fundamental key parameter for chemically strengthened glass covers used in non-foldable cellular phones. In addition to the above three requirements, the foldable cover panel also has a key performance requirement, namely bending performance. The bending properties may be closely related to the physical properties of the material, such as the thickness of the material, the modulus of the material, etc. For example, it is well known that the thinner the material, the more easily it is bent. However, the thinner the material, the lower its impact resistance. Also, the modulus of elasticity determines the stiffness (bendability) of the material. Therefore, the lower the modulus, the easier the bending. However, too low a modulus means that the material is too soft and is susceptible to plastic deformation after repeated bending. Therefore, the foldable cover plate must be balanced between key criteria of scratch resistance, impact resistance, optical properties and bendability.
At present, the two most potential materials are CPI and UTG, the CPI has good flexibility, but the optical performance and the scratch-resistant capability of the CPI are slightly insufficient, so that sputtering coating needs to be carried out on the CPI to prepare a hard coating; on the other hand, although UTG has a good hardness, it has insufficient impact resistance and is easily broken when subjected to a strong impact. Thus, current designers still do not consider UTG as the first surface of the entire foldable cover stack, i.e., a protective film is required to cover UTG to compensate for the lack of impact resistance.
Disclosure of Invention
In order to overcome the defects in the prior art, embodiments of the present invention provide a process for laminating and folding UTG and a CPI film multilayer material, wherein CPI is laminated on UTG, so that impact resistance of UTG can be enhanced, UTG also becomes a hard bottom of an upper CPI layer, and the defect that CPI is too soft and is easy to scratch is overcome, and an OCA coating tool bit is used for coating a CPI base film with a 5um OCA coating layer and laminating the CPI base film with an OCA coating tool bit from an original process HC-CPI-OCA-UTG laminating manner, so that a layer of 20um OCA can be reduced, and the product performance is good and the cost is low.
In order to achieve the purpose, the invention provides the following technical scheme: a process for laminating and folding UTG and CPI film multilayer materials comprises the following specific steps:
the method comprises the following steps: preparing a group A part: adding PGMG and EAC into a stirring barrel tank according to the proportion of 1:1-1.03, stirring, and then adding the main agent methyl acrylate and stirring;
step two: preparing a group B part: pouring the EAC and the additive into a beaker, manually stirring, pouring into the stirring barrel tank in the step one, and stirring to complete the preparation of the hardening liquid;
step three: stirring and mixing the hardening liquid prepared in the second step, pouring the mixture into a liquid supply barrel, and using an oven and a UV lamp to enable the oxygen content to be lower than 200 ppm;
step four: coating the hardening liquid in the glue supply barrel on the polyimide film through a precise Ginesian flowmeter by using a Tacmina pulseless pump in a slit type or micro-concave coating mode, and performing surface curing through an air floating type non-contact heat drying oven section;
step five: taking out of the oven, carrying out UV deep curing, and finally laminating through a protective film to form a front polyimide hardened film;
step six: pouring the OCA optical cement into another liquid supply barrel, and using an oven and a UV lamp to enable the oxygen content to be lower than 200 ppm;
step seven: coating OCA optical cement in a glue supply barrel on the back of the polyimide film by a gear pump in a specific OCA slit type coating mode through a precise Ginesian flowmeter, carrying out surface curing through an air-floating type non-contact type heat drying oven section, and carrying out UV (ultraviolet) deep curing after being taken out of an oven to form a polyimide hardened OCA film;
step eight: and then laminating the polyimide hardened OCA film and UTG by using a double-film-coating folding laminating machine to form a UTG and CPI film multilayer material.
In a preferred embodiment, the process is carried out in a hundred grade clean class dust plant.
In a preferred embodiment, the ratio of PGMG, EAC to the main agent methyl acrylate in step one is from 1:1 to 1.03: 1.
in a preferred embodiment, the stirring speed of PGMG and EAC is 200-250rpm for 5-10 minutes, and the stirring speed of acrylic acid as the main agent is 300-350rpm for 10-15 minutes when preparing the group A part in the step one.
In a preferred embodiment, the ratio of EAC to additive is 13-15:1 when preparing the group B part in the second step, the manual stirring time in the beaker is 3-5 minutes, the stirring speed in the stirring barrel tank is 300-350rpm, and the stirring time is 20-30 minutes.
In a preferred embodiment, the ROKI filter element 1um is installed for filtration when the hardening liquid and the OCA optical cement are poured into the liquid supply barrel in the third step and the sixth step, the temperature of the oven is set to be 50-100 ℃, the curing energy of the UV lamp is set to be 600-700mj/cm, and the oxygen content is lower than 200ppm after the N220 min is started.
In a preferred embodiment, the coating speed in step four is from 12 to 20 m/min.
In a preferred embodiment, the coating speed in step seven is 12-20 m/min.
The invention has the technical effects and advantages that:
the foldable cover plate with the composite structure is innovative, the process is scientific and reasonable, the performance is stable and reliable, the CPI is adhered to the UTG, the CPI is adhered to the UTG, the shock resistance of UTG can be enhanced, meanwhile, the UTG becomes a hard bottom of the CPI on the upper layer, and the defects that the CPI is too soft and is easy to scratch are overcome. The original flow HC-CPI-OCA-UTG attaching mode is converted into an attaching mode that an OCA coating tool bit is used for coating a CPI base film into a 5um OCA coating and then attaching, so that the thickness of the OCA coating can be reduced by one layer of 20um, the product performance is good, the cost is low, and the thickness is 40% of that of the foreign market.
Drawings
Fig. 1 is a drawing of a process for attaching UTG and CPI lidding multilayer materials of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
referring to the specification and the attached drawing 1, the invention provides a process for laminating and folding UTG and a CPI film multilayer material, which comprises the following specific steps:
the method comprises the following steps: in a hundred-grade clean-grade dust-free plant, part A is prepared: firstly adding 5000g of PGMG (propylene glycol methyl ether) and 4900g of EAC (ethyl acetate) into a stirring barrel tank, stirring at the rotating speed of 200rpm for 5 minutes, and then adding 5000g of methyl acrylate serving as a main agent, stirring at the rotating speed of 300rpm for 10 minutes;
step two: preparing a group B part: pouring 100g of EAC (ethyl acetate) and 7.5g of additive into a beaker, manually stirring for 3 minutes, pouring into the stirring barrel tank in the step one, and stirring for 20 minutes at the rotating speed of 300rpm to finish the preparation of the hardening liquid;
step three: stirring and mixing the hardening liquid prepared in the second step, pouring the mixture into a liquid supply barrel, installing an ROKI filter element with the diameter of 1um for filtering, setting the temperature of an oven to be 50 ℃, setting the curing energy of a UV lamp to be 600mj/cm, and turning on N220 minutes to ensure that the oxygen content is lower than 200 ppm;
step four: coating the hardening liquid of the glue supply barrel on the polyimide film by a precision Ginesian flowmeter at the coating speed of 12m/min by using a Tacmina pulseless pump in a slit type or micro-concave coating mode, and carrying out surface curing by an air-floating type contactless heat drying oven section;
step five: taking out of the oven, carrying out UV deep curing, and finally laminating through a protective film to form a front polyimide hardened film;
step six: pouring the OCA optical cement into another liquid supply barrel, installing an ROKI filter element of 1um for filtering, setting the temperature of an oven at 80 ℃, setting the curing energy of a UV lamp at 600mj/cm, and turning on N for 220 minutes to ensure that the oxygen content is lower than 200 ppm;
step seven: coating OCA optical cement of a glue supply barrel on the back of the polyimide film by a gear pump in a specific OCA seam type coating mode at a coating speed of 12m/min through a precision Ginese flowmeter, performing surface curing through an air floating type non-contact heat drying oven section, and performing UV (ultraviolet) deep curing after the polyimide film is taken out of the oven to form a polyimide hardened OCA film;
step eight: and then laminating the polyimide hardened OCA film and UTG by using a double-film-coating folding laminating machine to form a UTG and CPI film multilayer material.
Example 2:
referring to the specification and the attached drawing 1, the invention provides a process for laminating and folding UTG and a CPI film multilayer material, which comprises the following specific steps:
the method comprises the following steps: in a hundred-grade clean-grade dust-free plant, part A is prepared: firstly adding 5000g of PGMG (propylene glycol methyl ether) and 4900g of EAC (ethyl acetate) into a stirring barrel tank, stirring at the rotating speed of 225rpm for 8 minutes, and then adding 5000g of methyl acrylate serving as a main agent, stirring at the rotating speed of 325rpm for 12 minutes;
step two: preparing a group B part: pouring 100g of EAC (ethyl acetate) and 7.5g of additive into a beaker, manually stirring for 4 minutes, pouring into the stirring barrel tank in the step one, stirring for 25 minutes, and rotating at 325rpm to finish the preparation of the hardening liquid;
step three: stirring and mixing the hardening liquid prepared in the second step, pouring the mixture into a liquid supply barrel, installing an ROKI filter element with the diameter of 1um for filtering, setting the temperature of an oven to be 80 ℃, setting the curing energy of a UV lamp to be 650mj/cm, and turning on N225 minutes to ensure that the oxygen content is lower than 200 ppm;
step four: coating the hardening liquid of the glue supply barrel on the polyimide film by a precision Ginesian flowmeter at the coating speed of 12m/min by using a Tacmina pulseless pump in a slit type or micro-concave coating mode, and carrying out surface curing by an air-floating type contactless heat drying oven section;
step five: taking out of the oven, carrying out UV deep curing, and finally laminating through a protective film to form a front polyimide hardened film;
step six: pouring the OCA optical cement into another liquid supply barrel, installing an ROKI filter element of 1um for filtering, setting the temperature of an oven at 80 ℃, setting the curing energy of a UV lamp at 650mj/cm, and turning on N for 220 minutes to ensure that the oxygen content is lower than 200 ppm;
step seven: coating OCA optical cement of a glue supply barrel on the back of the polyimide film by a gear pump in a specific OCA seam type coating mode at a coating speed of 16m/min through a precision Ginese flowmeter, performing surface curing through an air floating type non-contact heat drying oven section, and performing UV (ultraviolet) deep curing after the polyimide film is taken out of the oven to form a polyimide hardened OCA film;
step eight: and then laminating the polyimide hardened OCA film and UTG by using a double-film-coating folding laminating machine to form a UTG and CPI film multilayer material.
Example 3:
referring to the specification and the attached drawing 1, the invention provides a process for laminating and folding UTG and a CPI film multilayer material, which comprises the following specific steps:
the method comprises the following steps: in a hundred-grade clean-grade dust-free plant, part A is prepared: firstly adding 5000g of PGMG (propylene glycol methyl ether) and 4900g of EAC (ethyl acetate) into a stirring barrel tank, stirring at the rotating speed of 250rpm for 10 minutes, and then adding 5000g of methyl acrylate serving as a main agent, stirring at the rotating speed of 350rpm for 15 minutes;
step two: preparing a group B part: taking 100g of EAC (ethyl acetate) and 7.5g of additive, pouring into a beaker, manually stirring for 5 minutes, pouring into the stirring barrel tank in the step one, and stirring for 30 minutes at the rotating speed of 350rpm, thus completing the preparation of the hardening liquid;
step three: stirring and mixing the hardening liquid prepared in the second step, pouring the mixture into a liquid supply barrel, installing an ROKI filter element with the diameter of 1um for filtering, setting the temperature of an oven at 100 ℃, setting the curing energy of a UV lamp at 700mj/cm, and turning on N220 minutes to ensure that the oxygen content is lower than 200 ppm;
step four: coating the hardening liquid of the glue supply barrel on the polyimide film by a precision Ginesian flowmeter at a coating speed of 20m/min by using a Tacmina pulseless pump in a slit type or micro-concave coating mode, and performing surface curing by an air-floating contactless heat drying oven section;
step five: taking out of the oven, carrying out UV deep curing, and finally laminating through a protective film to form a front polyimide hardened film;
step six: pouring the OCA optical cement into another liquid supply barrel, installing an ROKI filter element of 1um for filtering, setting the temperature of an oven at 80 ℃, setting the curing energy of a UV lamp at 650mj/cm, and turning on N225 minutes to ensure that the oxygen content is lower than 200 ppm;
step seven: coating OCA optical cement of a glue supply barrel on the back of the polyimide film by a gear pump in a specific OCA seam type coating mode at a coating speed of 20m/min through a precision Ginese flowmeter, performing surface curing through an air floating type non-contact heat drying oven section, and performing UV (ultraviolet) deep curing after the polyimide film is taken out of the oven to form a polyimide hardened OCA film;
step eight: and then laminating the polyimide hardened OCA film and UTG by using a double-film-coating folding laminating machine to form a UTG and CPI film multilayer material.
Example 4:
in order to find a balance point between durability, foldability, identifiability and hardness, a cover plate in a superposition mode of UTG-OCA-transparent PI film-Hard coating is used from bottom to top, Hard coating is used as an outermost protective layer, UTG is used as a support of CPI, the transparent PI film as a plastic material has advantages in durability and folding performance, UTG as a glass material has advantages in transparency and hardness, the two materials have thousands of autumn, and the main material advantages are as follows:
according to the foldable cover plate with the composite structure, namely the solution that UTG is attached with CPI, CPI is attached to UTG, so that the impact resistance of UTG can be enhanced, meanwhile, UTG becomes a hard bottom of the upper CPI layer, and the defects that the CPI is too soft and is easy to scratch are overcome. The original flow HC-CPI-OCA-UTG attaching mode is converted into an attaching mode that an OCA coating tool bit is used for coating a CPI base film into a 5um OCA coating and then attaching, so that the thickness of the OCA coating can be reduced by one layer of 20um, the product performance is good, the cost is low, and the thickness is 40% of that of the foreign market.
And finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (8)
1. A process for laminating and folding UTG and a CPI film multilayer material is characterized in that: the method comprises the following specific steps:
the method comprises the following steps: preparing a group A part: adding PGMG and EAC into a stirring barrel tank according to the proportion of 1:1-1.03, stirring, and then adding the main agent methyl acrylate and stirring;
step two: preparing a group B part: pouring the EAC and the additive into a beaker, manually stirring, pouring into the stirring barrel tank in the step one, and stirring to complete the preparation of the hardening liquid;
step three: stirring and mixing the hardening liquid prepared in the second step, pouring the mixture into a liquid supply barrel, and using an oven and a UV lamp to enable the oxygen content to be lower than 200 ppm;
step four: coating the hardening liquid in the glue supply barrel on the polyimide film through a precise Ginesian flowmeter by using a Tacmina pulseless pump in a slit type or micro-concave coating mode, and performing surface curing through an air floating type non-contact heat drying oven section;
step five: taking out of the oven, carrying out UV deep curing, and finally laminating through a protective film to form a front polyimide hardened film;
step six: pouring the OCA optical cement into another liquid supply barrel, and using an oven and a UV lamp to enable the oxygen content to be lower than 200 ppm;
step seven: coating OCA optical cement in a glue supply barrel on the back of the polyimide film by a gear pump in a specific OCA slit type coating mode through a precise Ginesian flowmeter, carrying out surface curing through an air-floating type non-contact type heat drying oven section, and carrying out UV (ultraviolet) deep curing after being taken out of an oven to form a polyimide hardened OCA film;
step eight: and then laminating the polyimide hardened OCA film and UTG by using a double-film-coating folding laminating machine to form a UTG and CPI film multilayer material.
2. A process of UTG conforming to a CPI film multi-layer material and folding in accordance with claim 1 wherein: the process was carried out in a hundred-grade clean-grade dust-free plant.
3. A process of UTG conforming to a CPI film multi-layer material and folding in accordance with claim 1 wherein: in the first step, the ratio of PGMG, EAC and the main agent methyl acrylate is 1: 1-1.03: 1.
4. a process of UTG conforming to a CPI film multi-layer material and folding in accordance with claim 1 wherein: the stirring rotation speed of PGMG and EAC is 200-250rpm for 5-10 minutes, and the stirring rotation speed of acrylic acid as the main agent is 300-350rpm for 10-15 minutes when preparing the group A part in the step one.
5. A process of UTG conforming to a CPI film multi-layer material and folding in accordance with claim 1 wherein: when the group B part is prepared in the step two, the proportion of the EAC to the additive is 13-15:1, the manual stirring time in the beaker is 3-5 minutes, the stirring speed is 300-350rpm when the mixture is poured into a stirring barrel tank, and the stirring time is 20-30 minutes.
6. A process of UTG conforming to a CPI film multi-layer material and folding in accordance with claim 1 wherein: and in the third step and the sixth step, when the hardening liquid and the OCA optical cement are poured into the liquid supply barrel, an ROKI filter element 1um is installed for filtering, the temperature of the oven is set to be 50-100 ℃, the curing energy of the UV lamp is set to be 600-700mj/cm, and the oxygen content is lower than 200ppm after N220 minutes is started.
7. A process of UTG conforming to a CPI film multi-layer material and folding in accordance with claim 1 wherein: the coating speed in the fourth step is 12-20 m/min.
8. A process of UTG conforming to a CPI film multi-layer material and folding in accordance with claim 1 wherein: in step seven the coating speed is 12-20 m/min.
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Citations (5)
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| CN110358124A (en) * | 2019-07-22 | 2019-10-22 | 新恒东薄膜材料（常州）有限公司 | A kind of preparation method of lower shrinkage high-hardness, wearable clear polyimides cured film |
| US20200057178A1 (en) * | 2018-08-14 | 2020-02-20 | Applied Materials, Inc. | Multi-layer wet-dry hardcoats for flexible cover lens |
| JP2020203479A (en) * | 2019-06-17 | 2020-12-24 | 大日本印刷株式会社 | Laminate, surface material for display, touch panel member, liquid crystal display device, and organic electroluminescence display device |
| CN113059888A (en) * | 2021-04-26 | 2021-07-02 | 芜湖长信新型显示器件有限公司 | Preparation method of foldable ultrathin glass cover plate |
| CN113067927A (en) * | 2021-03-23 | 2021-07-02 | 芜湖长信科技股份有限公司 | Flexible cover plate structure and production method thereof |
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2021
- 2021-07-09 CN CN202110775947.XA patent/CN113665215A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20200057178A1 (en) * | 2018-08-14 | 2020-02-20 | Applied Materials, Inc. | Multi-layer wet-dry hardcoats for flexible cover lens |
| JP2020203479A (en) * | 2019-06-17 | 2020-12-24 | 大日本印刷株式会社 | Laminate, surface material for display, touch panel member, liquid crystal display device, and organic electroluminescence display device |
| CN110358124A (en) * | 2019-07-22 | 2019-10-22 | 新恒东薄膜材料（常州）有限公司 | A kind of preparation method of lower shrinkage high-hardness, wearable clear polyimides cured film |
| CN113067927A (en) * | 2021-03-23 | 2021-07-02 | 芜湖长信科技股份有限公司 | Flexible cover plate structure and production method thereof |
| CN113059888A (en) * | 2021-04-26 | 2021-07-02 | 芜湖长信新型显示器件有限公司 | Preparation method of foldable ultrathin glass cover plate |
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Application publication date: 20211119 |