CN113411431B - Ultrathin flexible cover plate and production method thereof - Google Patents
Ultrathin flexible cover plate and production method thereof Download PDFInfo
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- CN113411431B CN113411431B CN202110825694.2A CN202110825694A CN113411431B CN 113411431 B CN113411431 B CN 113411431B CN 202110825694 A CN202110825694 A CN 202110825694A CN 113411431 B CN113411431 B CN 113411431B
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- ultrathin flexible
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- flexible glass
- glass
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 239000011521 glass Substances 0.000 claims abstract description 111
- 238000000034 method Methods 0.000 claims abstract description 48
- 238000000576 coating method Methods 0.000 claims abstract description 42
- 239000011248 coating agent Substances 0.000 claims abstract description 39
- 238000004140 cleaning Methods 0.000 claims abstract description 24
- 238000009501 film coating Methods 0.000 claims abstract description 19
- 239000007888 film coating Substances 0.000 claims abstract description 19
- 238000005259 measurement Methods 0.000 claims abstract description 18
- 238000012545 processing Methods 0.000 claims abstract description 16
- 230000002950 deficient Effects 0.000 claims abstract description 13
- 230000006378 damage Effects 0.000 claims abstract description 11
- 238000007599 discharging Methods 0.000 claims abstract description 10
- 238000005096 rolling process Methods 0.000 claims description 51
- 239000003292 glue Substances 0.000 claims description 49
- 239000000463 material Substances 0.000 claims description 16
- 239000010410 layer Substances 0.000 claims description 15
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 14
- 239000012670 alkaline solution Substances 0.000 claims description 9
- 230000006698 induction Effects 0.000 claims description 9
- 239000012790 adhesive layer Substances 0.000 claims description 6
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 4
- 239000003995 emulsifying agent Substances 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 208000027418 Wounds and injury Diseases 0.000 claims 1
- 208000014674 injury Diseases 0.000 claims 1
- 238000005452 bending Methods 0.000 abstract description 20
- 239000002861 polymer material Substances 0.000 abstract description 3
- 238000001723 curing Methods 0.000 description 7
- 238000011161 development Methods 0.000 description 6
- 229920002457 flexible plastic Polymers 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 4
- 238000003848 UV Light-Curing Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 125000000524 functional group Chemical group 0.000 description 3
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 229920005570 flexible polymer Polymers 0.000 description 2
- 238000013007 heat curing Methods 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000013208 measuring procedure Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
- B07B13/04—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices according to size
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
- B07B13/14—Details or accessories
- B07B13/18—Control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B11/00—Cleaning flexible or delicate articles by methods or apparatus specially adapted thereto
- B08B11/04—Cleaning flexible or delicate articles by methods or apparatus specially adapted thereto specially adapted for plate glass, e.g. prior to manufacture of windshields
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
- C03C17/28—Surface treatment of glass, not in the form of fibres or filaments, by coating with organic material
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2218/00—Methods for coating glass
- C03C2218/10—Deposition methods
- C03C2218/11—Deposition methods from solutions or suspensions
- C03C2218/118—Deposition methods from solutions or suspensions by roller-coating
Abstract
The invention discloses a production method of an ultrathin flexible cover plate, which comprises the working procedures of feeding, surface cleaning, surface coating, plate thickness measurement, finished product film covering and discharging, wherein the whole process is automatic operation; the ultrathin flexible glass is placed on a processing track and sequentially passes through feeding, surface cleaning, surface coating, plate thickness measurement, finished product film coating and discharging procedures, a reworking track is arranged between the plate thickness measurement procedure and the surface coating procedure, a defective product output track is arranged between the plate thickness measurement procedure and the feeding procedure, and the reworking track and the defective product output track are arranged on two sides of the processing track. According to the invention, the flexible cover plate is prepared by coating the flexible high polymer material on the surface of the ultrathin flexible glass so as to achieve both the ultrahigh strength and the excellent bending performance, and the problem that the glass is fragile and has harm in the prior art is solved.
Description
Technical Field
The invention belongs to the technical field of ultra-thin glass processing, and particularly relates to an ultra-thin flexible cover plate and a production method thereof.
Background
With the rapid development of the electronic display industry, the use of a single-screen mobile phone cannot meet the demands of consumers, the mobile phone is developed to double-screen or multi-screen, and the mobile phone can save larger space in a folding or curling mode, is more convenient to carry and meets the demands of consumers, so that the mobile phone with the flexible screen becomes the main attack direction of the smart phone in the future, the appearance of the mobile phone with the flexible screen becomes a huge milestone in the development history of the smart phone, and is a huge challenge, the use of the mobile phone cover plate has high requirements, on one hand, the mobile phone cover plate is required to have enough flexibility, can achieve folding or curling in any direction, and does not have crease marks after being bent for a long time, so that the best display effect of the mobile phone is ensured; on the other hand, the cover plate of the mobile phone is required to have ultrahigh strength and can bear strong external impact, so that the flexible display device is not damaged.
However, in the prior art, the material of the folding display cover plate is basically flexible plastic, and although the folding requirement can be met, the surface of the flexible plastic cover plate is easy to scratch and break due to the limitation of the mechanical property of the flexible plastic cover plate. In addition, there is also a flexible cover plate prepared by laminating UTG a transparent polyimide (CPI), but after repeated use, the flexible cover plate has defects such as crease in the bending area and easy corrugation of the screen, thereby affecting the application of the display device. Therefore, the ultrathin flexible glass (UTG) becomes a hot point in current research and development, UTG is glass with flexibility and glass thickness below 100um, and the most outstanding characteristic is flexibility, and the display device can be bent or folded by using the flexibility, so that convenience is brought to people in carrying or using the glass. However, due to the brittleness and strength of the glass, the glass is easy to crush and sputter after being crushed, and has a certain harm to the human body, so that the simple UTG cannot be independently applied to the outermost layer of the display device.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art, and therefore, the invention aims to provide a production method of an ultrathin flexible cover plate, wherein a flexible high polymer material is coated on the surface of ultrathin flexible glass to prepare the flexible cover plate so as to achieve both ultrahigh strength and excellent bending performance, and solve the problem that the glass is fragile and has harm in the prior art; the invention also provides an ultrathin flexible cover plate.
In order to achieve the above purpose, the technical scheme of the invention is as follows: a production method of an ultrathin flexible cover plate is characterized by comprising the following steps of: the ultra-thin flexible glass is placed on a processing track and sequentially passes through feeding, surface cleaning, surface coating, plate thickness measuring, finished product film coating and discharging procedures, a reworking track is arranged between the plate thickness measuring procedure and the surface coating procedure, a defective product output track is arranged between the plate thickness measuring procedure and the feeding procedure, and the reworking track and the defective product output track are arranged on two sides of the processing track.
Further, the surface coating comprises dispensing, film coating, rolling, curing and Film removing, the surface of the ultrathin flexible glass is subjected to dispensing by dispensing equipment after the surface is cleaned, the ultrathin flexible glass sequentially passes through the processes of dispensing, film coating, rolling, curing and Film removing along with the processing track, and then a glue layer is formed on the ultrathin flexible glass to form an ultrathin flexible cover plate, and then the ultrathin flexible cover plate enters a plate thickness measuring process to measure the thickness of the ultrathin flexible cover plate.
Further, the surface cleaning comprises ultrasonic cleaning and plasma cleaning, wherein the ultrathin flexible glass is soaked by alkaline solution before ultrasonic cleaning, after soaking, the ultrathin flexible glass is transferred into pure water for ultrasonic cleaning, and the ultrasonic radiation enables microbubbles in the liquid in the tank to keep vibrating under the action of sound waves, so that the adsorption of dirt on the surface of an object to be cleaned is destroyed, and the surface of the ultrathin flexible glass is cleaned; then, performing plasma cleaning on the ultrathin flexible glass; the plasma cleaning breaks the original chemical bonds of the contaminants and impurities remained on the surface of the ultrathin flexible glass and introduces new functional groups such as hydroxyl, amino and carboxyl, so that the surface activity and the surface adhesion of the glass can be improved.
Further, the temperature of the alkaline solution is 80-90 ℃, the time for immersing the ultrathin flexible glass in the alkaline solution is 10-20min, and triethanolamine for reducing the surface tension and adhesive force of an oil film on the glass is added into the alkaline solution as an emulsifier; the temperature of the pure water is 50-70 ℃ during ultrasonic cleaning.
Furthermore, the dispensing equipment used in the dispensing process can be compatible with simultaneous dispensing or independent dispensing of a plurality of needles in parallel, the operation among the needles is mutually independent, and the air pressure and the amount of the dispensed glue are independently controlled; the dispensing lines may be arranged in "Z", "N", "V" and "mouth" patterns.
Further, the rolling is to apply a certain pressure by using a rolling device, disperse the coated glue on the surface of the whole ultrathin flexible glass, roll out the redundant glue, and control the thickness and uniformity of the glue layer coating; the rolling device comprises a vertical shaft, a rolling shaft and a rolling wheel, wherein the vertical shaft is connected with the rolling shaft at an angle of 45 degrees, the vertical shaft is connected with the rolling shaft through a hinge, the rolling shaft can rotate by 0-360 degrees, and the rolling wheel is connected to the rolling shaft.
Furthermore, before the dispensing operation, fixing frames are required to be arranged on four sides of the ultrathin flexible glass, the fixing frames play a supporting role when rolling the roller, and uneven thickness of a coating layer caused by excessive rolling of a glue material due to improper force in the subsequent rolling process is avoided, and the height of the fixing frames is consistent with the thickness of a target ultrathin flexible cover plate; the ultrathin flexible glass is equal-thickness ultrathin flexible glass or non-equal-thickness ultrathin flexible glass.
Further, the thickness measurement adopts a full-automatic infrared induction thickness measuring instrument, the thickness range of an ultrathin flexible cover plate is set in the full-automatic infrared induction thickness measuring instrument, the full-automatic infrared induction thickness measuring instrument can automatically detect samples which exceed or are lower than a target thickness and separate the samples, and if the samples exceed the target thickness, the samples directly enter a defective product track to be output and serve as a film product to be reworked; if the thickness of the plate is lower than the target plate thickness, the reworkable track is output to a glue dispensing process, glue is supplemented by adopting a manual glue dispensing or automatic glue dispensing mode aiming at the position with lower plate thickness, and products are automatically transported to a next working section after glue supplementing.
Further, film coating is that Film is paved on the adhesive material on the ultrathin flexible glass after dispensing, so that the roller operation cannot cause damage to the appearance of the coating in the rolling process, and the Film coating and Film removing process is carried out by adopting PC, PET, PE or PP.
The invention also relates to an ultrathin flexible cover plate prepared by the production method of the ultrathin flexible cover plate, wherein the ultrathin flexible cover plate comprises ultrathin flexible glass and an adhesive layer, the adhesive layer is coated on the ultrathin flexible glass, and the ultrathin flexible glass is equal-thickness ultrathin flexible glass or unequal-thickness ultrathin flexible glass.
The technical scheme of the invention has the advantages that:
1. the production method for the ultrathin flexible cover plate mainly comprises six steps of feeding, surface cleaning, surface coating, plate thickness measurement, finished product film covering and discharging, and the whole process is automatic operation, so that the labor cost investment is reduced, and the production efficiency is improved to a great extent. Meanwhile, the plate thickness of a coating sample can be monitored in real time in the production process, different treatment modes are provided for products with low plate thickness or high plate thickness, and the rework rate of defective products is increased, so that the production waste is reduced, the production cost is reduced, and great contribution is made to the development of flexible screen mobile phones.
2. The invention also provides a simple and practical method for preparing the non-uniform thickness ultrathin flexible cover plate, mainly aims at the different characteristics of a bending area and a non-bending area, controls the dispensing amount of the non-uniform thickness area to be higher than that of the uniform thickness area, and is prepared by coating a flexible polymer film layer on the surface of the non-uniform thickness ultrathin flexible glass in a manner of dispensing coating and rolling after coating, so that the strength of the cover plate can be further improved while the bending performance is ensured, the harm of the cover plate in the use process is reduced, the defect that the bending performance and the strength of the cover plate of a mobile phone in the market cannot be simultaneously met is effectively solved, and great contribution is made to the development of a mobile phone with a flexible screen.
Drawings
The invention is described in further detail below with reference to the attached drawings and detailed description:
FIG. 1 is a schematic flow chart of a production method of an ultrathin flexible cover plate;
FIG. 2 is a schematic illustration of the coating process of the ultra-thin flexible glass cement material with equal thickness according to the present invention;
FIG. 3 is a schematic illustration of a coating process of the non-uniform thickness ultrathin flexible glass cement material of the invention;
FIG. 4 is a schematic view of the non-uniform thickness ultrathin flexible glass of the invention.
The labels in the above figures are respectively: 1. and fixing the frame.
Detailed Description
In the present invention, it is to be understood that the term "length"; "width"; "go up"; "Down"; "front"; "rear"; "left"; "right"; "vertical"; "horizontal"; "roof"; "bottom", "inner"; "outside"; "clockwise"; "counterclockwise"; "axial"; "planar orientation"; the orientation or positional relationship indicated by "circumferential" or the like is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description and simplification of description, and is not indicative or implying that the apparatus or element to be referred to must have a specific orientation; constructed and operated in a particular orientation and therefore should not be construed as limiting the invention.
The production method of the ultrathin flexible cover plate as shown in the figures 1 to 4 comprises the working procedures of feeding, surface cleaning, surface coating, plate thickness measurement, finished product film covering and discharging, wherein the whole process is an automatic operation; the ultrathin flexible glass is placed on a processing track and sequentially passes through feeding, surface cleaning, surface coating, plate thickness measurement, finished product film coating and discharging procedures, a reworking track is arranged between the plate thickness measurement procedure and the surface coating procedure, a defective product output track is arranged between the plate thickness measurement procedure and the feeding procedure, and the reworking track and the defective product output track are arranged on two sides of the processing track. According to the invention, the flexible cover plate is prepared by coating the flexible high polymer material on the surface of the ultrathin flexible glass so as to achieve both the ultrahigh strength and the excellent bending performance, and the problem that the glass is fragile and has harm in the prior art is solved.
The surface coating comprises dispensing, film coating, rolling, curing and Film removing, the surface of the ultrathin flexible glass is subjected to dispensing by a dispensing device after the surface is cleaned, the ultrathin flexible glass sequentially passes through the processes of dispensing, film coating, rolling, curing and Film removing along with the processing track, and then a glue layer is formed on the ultrathin flexible glass to form an ultrathin flexible cover plate, and then the ultrathin flexible cover plate enters a plate thickness measuring process to measure the thickness of the ultrathin flexible cover plate.
The surface cleaning comprises ultrasonic cleaning and plasma cleaning, wherein the ultrasonic cleaning is firstly carried out, and then the plasma cleaning is carried out; before ultrasonic cleaning, the glass is soaked in alkaline solution at 80-90 deg.c for 10-20min, and triethanolamine as emulsifier is added to reduce the surface tension and adhesion of oil film on the glass to break the oil film into very small oil drops and to eliminate greasy dirt. After the soaking is finished, the glass is transferred into pure water at 50-70 ℃ for ultrasonic cleaning, and the main function of the ultrasonic cleaning is to make use of ultrasonic radiation to make microbubbles in the liquid in the tank keep vibrating under the action of sound waves, so that the adsorption of dirt on the surface of the cleaned object is destroyed, and the UTG (ultrathin flexible glass) surface is cleaned; and then plasma cleaning is carried out on the ultrathin flexible glass.
The essence of plasma cleaning is that plasma cleaning is utilized, on one hand, the plasma cleaning can remove pollutants and impurities which are not cleaned on the surface of glass, and the etching effect is generated on the glass, so that the specific surface is increased, and the wettability of the surface is improved; on the other hand, the original chemical bonds on the surface of the glass can be broken by plasma cleaning, and as residual alkali liquor and triethanolamine still exist on the surface of the glass after ultrasonic cleaning, the air plasma continuously hits the surface of the glass, and the chemical bonds of residual substances on the surface of the glass are broken, new functional groups such as hydroxyl groups, amino groups, carboxyl groups and the like are introduced at the moment, and the functional groups are all active groups, so that the surface activity and the surface adhesion of the glass can be obviously improved.
The dispensing equipment used in the dispensing process can be compatible with simultaneous dispensing of a plurality of needles in parallel or separate dispensing, the operation among the needles is mutually independent, and the air pressure and the amount of the dispensed glue are separately controlled; the dispensing lines may be arranged in "Z", "N", "V" and "mouth" patterns. Specifically, the dispensing device can be compatible with at least five needles to simultaneously dispense glue in parallel, the operation between each needle is mutually independent, the air pressure and the glue amount of each dispensing can be controlled independently, the dispensing program can be set to be automatic or manual, and the dispensing route can be set to be Z, N, V and mouth. The quantity of the pinheads adopted during dispensing is mainly related to the size of glass, and a single-pinhead or multi-pinhead synchronous dispensing coating mode is adopted, so that on one hand, the coating time of a glue material can be saved, the productivity of equipment is improved, the processing of glass with different sizes can be met, and on the other hand, the gap between the glue coated by the multi-pinhead synchronous dispensing is smaller, so that the problem that a local film layer cannot be covered is avoided, and the coated product has better uniformity of the film layer.
Before the point gum operation, need set up fixed frame 1 at ultra-thin flexible glass four sides, fixed frame 1 plays the supporting role when the gyro wheel roll extrusion, avoids follow-up roll extrusion in-process hard inappropriately to roll out the glue material too much and lead to the coating thick inhomogeneous, and the height of fixed frame 1 is unanimous with the thickness of the ultra-thin flexible apron of target. The fixing frame forms include, but are not limited to, plastics, protective films, adhesive tapes and combinations thereof, and the main materials include, but are not limited to, PC, PET, PE, PP, PVC and acrylic.
The ultrathin flexible glass is equal-thickness ultrathin flexible glass or non-equal-thickness ultrathin flexible glass; in the prior art, a laminated product of glass and flexible plastic is generally used as a folding display cover plate, however, in order to meet the ultra-high hardness requirement of the cover plate, the flexible plastic needs to reach a certain thickness, and when the thickness is larger, the bending performance of the cover plate cannot meet the requirement. Therefore, the non-uniform thickness ultrathin flexible cover plate is mainly composed of a bending region and a non-bending region which is thicker than the bending region, wherein the thickness of the bending region is smaller than 100um so as to ensure that the cover plate has excellent bending performance, and the thickness range of the non-bending region is 100-200um so as to ensure that the cover plate has ultrahigh strength, so that the non-uniform thickness ultrathin flexible glass is also proposed. However, due to the brittleness factor of the glass, the glass is easy to crush and sputter after being crushed, and has certain harm to human bodies, so that flexible organic materials can be coated on the surface of the non-uniform-thickness ultrathin flexible glass, the harm of the cover plate in the use process is reduced, the bending performance is ensured, the strength of the cover plate is further improved, and the application range of the cover plate is enlarged.
When the ultrathin flexible glass is non-uniform thickness ultrathin flexible glass, a fixing frame 1 is still required to be arranged on four sides of the ultrathin flexible glass before dispensing operation; the dispensing device can be compatible with at least ten parallel simultaneous dispensing needles, the operation among each needle is mutually independent, the air pressure and the glue amount of each dispensing can be independently controlled and regulated to be inconsistent, the dispensing program can be set to be automatic or manual, and the dispensing route can be set to be Z, N, V and mouth. The quantity of the pinheads adopted during dispensing is mainly related to the size of glass, and a single-pinhead or multi-pinhead synchronous dispensing coating mode is adopted, so that on one hand, the coating time of a glue material can be saved, the productivity of equipment is improved, the processing of glass with different sizes can be met, and on the other hand, the gap between the glue coated by the multi-pinhead synchronous dispensing is smaller, so that the problem that a local film layer cannot be covered is avoided, and the coated product has better uniformity of the film layer. Meanwhile, as the needle heads can be controlled independently, the dispensing amount can be adjusted according to the thickness of the non-uniform thickness glass at different positions, namely, the dispensing amount in the uniform thickness area is lower than that in the non-uniform thickness area, so that the uniformity of the final target thickness is achieved.
Shapes of non-uniform thickness ultrathin flexible glass include, but are not limited to, arcuate, semi-arcuate, rectangular, single-channel, and multi-channel.
The rolling is to apply a certain pressure by using a rolling device, disperse the coated glue on the surface of the whole ultrathin flexible glass, roll out the redundant glue, and control the thickness and uniformity of the glue layer coating; the rolling device comprises a vertical shaft, a rolling shaft and a rolling wheel, wherein the vertical shaft is connected with the rolling shaft at an angle of 45 degrees, the vertical shaft is connected with the rolling shaft through a hinge, the rolling shaft can rotate by 0-360 degrees, and the rolling wheel is connected to the rolling shaft.
Specifically, the main function of rolling is to disperse the coated glue on the surface of the whole glass by using a certain pressure, and roll out the redundant glue so as to control the thickness and uniformity of the glue layer coating. The rolling device mainly comprises a vertical shaft, a rolling shaft and rollers which are connected with each other, wherein the vertical shaft is connected with the rolling shaft at an angle of 45 degrees, the joint of the two shafts is not fixed, and 0-360 degrees of rotation can be realized, which is mainly used for realizing rolling of glass from each direction by the rollers, so that the purpose of completely extruding bubbles in glue is achieved, and the thickness and uniformity of a glue layer after coating are further ensured. The rolling pressure and direction are adjustable according to different glue material properties and different film thickness requirements.
Film coating is to lay Film on the adhesive material on the ultrathin flexible glass after dispensing, and the main purpose of the Film coating is to ensure that the roller operation cannot cause damage to the appearance of the coating in the rolling process, and Film coating and Film removing processes are performed by using Film materials including but not limited to PC, PET, PE and PP.
The curing mode mainly comprises but is not limited to heat curing or UV curing; in actual operation, different curing modes are selected according to different materials of sizing materials used in coating, namely, heating curing or UV curing is selected according to actual requirements; both heat curing and UV curing are well known in the art of glass processing and will not be described in detail herein.
The thickness measurement adopts a full-automatic infrared induction thickness measuring instrument, the thickness range of an ultrathin flexible cover plate is set in the full-automatic infrared induction thickness measuring instrument, the full-automatic infrared induction thickness measuring instrument can automatically detect samples exceeding or being lower than a target thickness and separate the samples, and if the samples exceed the target thickness, the samples directly enter a defective product track to be output and serve as a film product to be reworked; if the thickness of the plate is lower than the target plate thickness, the plate is output to a glue dispensing process through a reworkable track, glue is supplemented by adopting a manual glue dispensing or automatic glue dispensing mode aiming at the position with lower plate thickness, and products are automatically transported to a next working section after glue supplementing, so that the reworking purpose is achieved, and the yield is improved.
And (3) entering a finished product film covering process into the qualified ultrathin flexible cover plate after plate thickness measurement, obtaining an ultrathin flexible cover plate finished product, discharging, and finishing processing.
The ultrathin flexible cover plate prepared based on the production method of the ultrathin flexible cover plate comprises ultrathin flexible glass and an adhesive layer, wherein the adhesive layer is coated on the ultrathin flexible glass, and the ultrathin flexible glass is equal-thickness ultrathin flexible glass or non-equal-thickness ultrathin flexible glass. Shapes of non-uniform thickness ultrathin flexible glass include, but are not limited to, arcuate, semi-arcuate, rectangular, single-channel, and multi-channel.
The production method for the ultrathin flexible cover plate mainly comprises six steps of feeding, surface cleaning, surface coating, plate thickness measurement, finished product film covering and discharging, and the whole process is automatic operation, so that the labor cost investment is reduced, and the production efficiency is improved to a great extent. Meanwhile, the plate thickness of a coating sample can be monitored in real time in the production process, different treatment modes are provided for products with low plate thickness or high plate thickness, and the rework rate of defective products is increased, so that the production waste is reduced, the production cost is reduced, and great contribution is made to the development of flexible screen mobile phones.
The invention also provides a simple and practical method for preparing the non-uniform thickness ultrathin flexible cover plate, mainly aims at the different characteristics of a bending area and a non-bending area, controls the dispensing amount of the non-uniform thickness area to be higher than that of the uniform thickness area, and is prepared by coating a flexible polymer film layer on the surface of the non-uniform thickness ultrathin flexible glass in a manner of dispensing coating and rolling after coating, so that the strength of the cover plate can be further improved while the bending performance is ensured, the harm of the cover plate in the use process is reduced, the defect that the bending performance and the strength of the cover plate of a mobile phone in the market cannot be simultaneously met is effectively solved, and great contribution is made to the development of a mobile phone with a flexible screen.
While the invention has been described above with reference to the accompanying drawings, it will be apparent that the invention is not limited to the above embodiments, but is capable of being modified in various ways, or of being applied to other applications without modification, without departing from the scope of the invention.
Claims (7)
1. A production method of an ultrathin flexible cover plate is characterized by comprising the following steps of: the method comprises feeding, surface cleaning, surface coating, plate thickness measurement, finished product film coating and discharging, wherein ultrathin flexible glass is placed on a processing track and sequentially subjected to feeding, surface cleaning, surface coating, plate thickness measurement, finished product film coating and discharging, a reworking track is arranged between the plate thickness measurement process and the surface coating process, a defective product output track is arranged between the plate thickness measurement process and the feeding process, and the reworking track and the defective product output track are arranged on two sides of the processing track; the surface coating comprises the steps of dispensing, film coating, rolling, solidifying and Film removing, wherein the surface of the ultrathin flexible glass is subjected to the steps of dispensing, film coating, rolling, solidifying and Film removing by using dispensing equipment after the surface of the ultrathin flexible glass is cleaned, the ultrathin flexible glass sequentially passes through the steps of dispensing, film coating, rolling, solidifying and Film removing along with the processing track, and then a glue layer is formed on the ultrathin flexible glass to form an ultrathin flexible cover plate, and then the thickness of the ultrathin flexible cover plate is measured by entering a plate thickness measuring step; the dispensing equipment used in the dispensing process can be compatible with simultaneous dispensing of a plurality of needles in parallel or independent dispensing, the operation among the needles is mutually independent, and the air pressure and the amount of the dispensed glue are independently controlled; the dispensing route can be set as Z, N, V and mouth shapes; before the dispensing operation, fixing frames (1) are required to be arranged on four sides of the ultrathin flexible glass, the fixing frames (1) play a supporting role when rolling wheels, and the height of the fixing frames (1) is consistent with the thickness of the ultrathin flexible cover plate; the ultrathin flexible glass is equal-thickness ultrathin flexible glass or non-equal-thickness ultrathin flexible glass; when the ultrathin flexible glass is of unequal thickness, the dispensing equipment can be compatible with at least one and at most ten needle heads to dispense simultaneously, the operation among each needle head is mutually independent, the air pressure and the glue amount of each dispensing can be independently controlled and regulated to be inconsistent, and the dispensing program can be set to be automatic or manual; the glue dispensing quantity is regulated according to the thickness of different positions of the non-uniform thickness glass by adopting a single-needle or multi-needle simultaneous glue dispensing mode, namely, the glue dispensing quantity in the uniform thickness area is lower than that in the non-uniform thickness area, so that the uniformity of the final target thickness is achieved.
2. A method of producing an ultra-thin flexible cover sheet according to claim 1, wherein: the surface cleaning comprises ultrasonic cleaning and plasma cleaning, wherein the ultrathin flexible glass is soaked by alkaline solution before ultrasonic cleaning, after soaking, the ultrathin flexible glass is transferred into pure water for ultrasonic cleaning, and the ultrasonic radiation enables microbubbles in the liquid in the tank to keep vibrating under the action of sound waves, so that the adsorption of dirt on the surface of an object to be cleaned is destroyed, and the surface of the ultrathin flexible glass is cleaned; and then plasma cleaning is carried out on the ultrathin flexible glass.
3. A method of producing an ultra-thin flexible cover sheet according to claim 2, wherein: the temperature of the alkaline solution is 80-90 ℃, the time for immersing the ultrathin flexible glass in the alkaline solution is 10-20min, and triethanolamine which is used for reducing the surface tension and adhesive force of an oil film on the glass is added into the alkaline solution as an emulsifier; the temperature of the pure water is 50-70 ℃ during ultrasonic cleaning.
4. A method of producing an ultra-thin flexible cover sheet according to claim 3, wherein: the rolling is to apply a certain pressure by using a rolling device, disperse the coated glue on the surface of the whole ultrathin flexible glass, roll out the redundant glue, and control the thickness and uniformity of the glue layer coating; the rolling device comprises a vertical shaft, a rolling shaft and a rolling wheel, wherein the vertical shaft is connected with the rolling shaft at an angle of 45 degrees, the vertical shaft is connected with the rolling shaft through a hinge, the rolling shaft can rotate by 0-360 degrees, and the rolling wheel is connected to the rolling shaft.
5. A method of producing an ultra-thin flexible cover sheet according to claim 1 or 2, characterized in that: the thickness measurement adopts a full-automatic infrared induction thickness measuring instrument, the thickness range of an ultrathin flexible cover plate is set in the full-automatic infrared induction thickness measuring instrument, the full-automatic infrared induction thickness measuring instrument can automatically detect samples exceeding or being lower than a target thickness and separate the samples, and if the samples exceed the target thickness, the samples directly enter a defective product track to be output and serve as a film product to be reworked; if the thickness of the plate is lower than the target plate thickness, the reworkable track is output to a glue dispensing process, glue is supplemented by adopting a manual glue dispensing or automatic glue dispensing mode aiming at the position with lower plate thickness, and products are automatically transported to a next working section after glue supplementing.
6. The method for producing an ultrathin flexible cover sheet according to claim 5, wherein: film coating lays Film on the adhesive material on ultra-thin flexible glass promptly after the point is glued, guarantees that in the roll extrusion process, the gyro wheel operation can not cause the injury to the coating appearance, and Film coating and the Film material that removes the in-process used are PC, PET, PE or PP.
7. An ultrathin flexible cover plate, which is characterized in that: an ultrathin flexible cover plate prepared by the production method of the ultrathin flexible cover plate according to any one of claims 1 to 6, wherein the ultrathin flexible cover plate comprises ultrathin flexible glass and an adhesive layer, the adhesive layer is coated on the ultrathin flexible glass, and the ultrathin flexible glass is equal-thickness ultrathin flexible glass or unequal-thickness ultrathin flexible glass.
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