CN116653200A - Preparation method of touch screen part with large window - Google Patents
Preparation method of touch screen part with large window Download PDFInfo
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- CN116653200A CN116653200A CN202310624284.0A CN202310624284A CN116653200A CN 116653200 A CN116653200 A CN 116653200A CN 202310624284 A CN202310624284 A CN 202310624284A CN 116653200 A CN116653200 A CN 116653200A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims abstract description 37
- 239000004926 polymethyl methacrylate Substances 0.000 claims abstract description 37
- 239000000758 substrate Substances 0.000 claims abstract description 33
- 238000001746 injection moulding Methods 0.000 claims abstract description 32
- 238000003848 UV Light-Curing Methods 0.000 claims abstract description 28
- 238000002347 injection Methods 0.000 claims abstract description 27
- 239000007924 injection Substances 0.000 claims abstract description 27
- 239000012528 membrane Substances 0.000 claims abstract description 24
- 238000000465 moulding Methods 0.000 claims abstract description 24
- 239000011248 coating agent Substances 0.000 claims abstract description 17
- 238000000576 coating method Methods 0.000 claims abstract description 17
- 238000001179 sorption measurement Methods 0.000 claims abstract description 17
- 238000001723 curing Methods 0.000 claims abstract description 11
- 238000004080 punching Methods 0.000 claims abstract description 10
- 238000003801 milling Methods 0.000 claims abstract description 6
- 238000004806 packaging method and process Methods 0.000 claims abstract description 6
- 230000001681 protective effect Effects 0.000 claims abstract description 6
- 229920003023 plastic Polymers 0.000 claims description 63
- 239000004033 plastic Substances 0.000 claims description 63
- 229920007019 PC/ABS Polymers 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 18
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 10
- 229910052753 mercury Inorganic materials 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 description 22
- 239000002994 raw material Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- 239000002103 nanocoating Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 230000002452 interceptive effect Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
- B29L2031/3475—Displays, monitors, TV-sets, computer screens
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention belongs to the technical field of automobile parts, and relates to a preparation method of a touch screen part with a large window. The invention discloses a preparation method of a touch screen part with a large window, which comprises the following steps: s1, sequentially carrying out high-pressure adsorption molding, 3D punching and first UV curing on a PC/PMMA substrate to obtain an IML membrane, wherein the periphery of the IML membrane is covered by 1-5 mm; s2, placing the IML membrane in a double-color injection molding machine for double-color injection molding; s3, carrying out secondary UV curing on the injection molded product; s4, placing the product on a CNC (computerized numerical control) tool, and engraving and milling the injection molding edge-extending area; s5, sticking a protective film on the two sides of the detected product, and packaging; the PC/PMMA substrate sequentially comprises a hardening coating, a PMMA layer and a PC layer from top to bottom, wherein the hardening coating has a curing rate of 10-40%; the hardness of the surface of the touch screen part with the large window is more than 3H, and no rainbow lines exist.
Description
Technical Field
The invention belongs to the technical field of automobile parts, and relates to a preparation method of a touch screen part with a large window.
Background
Touch screens are extremely promising interactive input technologies, and are increasingly used in life with the construction of social digitization. In order to meet better interactive experience, the display area requirements of touch screens are also growing, which also creates new challenges for the preparation of component materials. The touch screen is required to have a certain hardness and to have a prolonged service life because it requires a long contact time and scratches affect the feeling of use. At present, in order to obtain better hardness of a transparent large window in a part, materials such as a nano coating are required to be covered on the surface, the coating cost is higher, rainbow patterns can be possibly caused, and the yield in the preparation process is low.
At present, an IML sheet and a double-color injection molding process are generally adopted to obtain a workpiece with a light transmission area, for example, chinese patent text (publication number: CN 112743748A) also proposes the combination of an IML film and the double-color injection molding process, wherein the IML film is positioned between two color materials, so that the abrasion resistance and scratch resistance of patterns on the IML film are ensured, but the method cannot be suitable for preparing touch screen parts; chinese patent document (publication No. CN111745885 a) proposes that an IML sheet with printed UV cured light-transmitting texture is subjected to high pressure adsorption molding and then double-shot injection molding; the problem that the tensile property of the IML sheet after the printing UV curing is limited, cracks can occur, the size of a window is unstable, the yield is low, and the hardness of the manufactured finished product cannot meet the use requirement of a touch screen.
Disclosure of Invention
The invention aims at solving the problems in the prior art, and provides a preparation method of a touch screen part with a large window, which has high yield, and the prepared touch screen part with the large window has a transparent window with a large area ratio, high surface hardness, no rainbow lines and long service life.
The aim of the invention can be achieved by the following technical scheme:
a method of manufacturing a touch screen component having a large window, the method comprising:
s1, sequentially carrying out high-pressure adsorption molding, 3D punching and first UV curing on a PC/PMMA substrate to obtain an IML membrane, wherein the periphery of the IML membrane is covered by 1-5 mm;
s2, placing the IML membrane in a double-color injection molding machine for double-color injection molding;
s3, carrying out secondary UV curing on the injection molded product;
s4, placing the product on a CNC (computerized numerical control) tool, and engraving and milling the injection molding edge-extending area;
s5, sticking a protective film on the two sides of the detected product, and packaging;
the PC/PMMA substrate sequentially comprises a hardening coating, a PMMA layer and a PC layer from top to bottom, wherein the hardening coating has a curing rate of 10-40%;
the hardness of the surface of the touch screen part with the large window is more than 3H, and no rainbow lines exist.
The method can lead the hardness of the parts of the touch screen with a large window to be more than or equal to 3H and has no rainbow lines; if the substrate is subjected to UV curing or printing UV curing before high-pressure adsorption molding, the limited degree of the stretching performance of the substrate is gradually increased in the subsequent high-pressure adsorption molding process (the curing rate is more than 50 percent), cracks can occur (the curing rate is more than 80 percent), the yield is reduced, and the size of the window is unstable; if the material such as nano coating is covered on the surface of the PC/PMMA substrate after molding or the finished product after injection molding, the material can obtain better hardness, but rainbow lines are caused, and the yield is low.
In addition, the touch screen component with the large window is used for a touch screen, the thickness of the transparent window part is required, the touch screen is insensitive due to excessive thickness, and the service life is poor or the hardness is insufficient due to excessive thinness.
Preferably, the PC/PMMA substrate has a hardness of 0.2 to 0.3H (on the cured coating side), and the IML film has a hardness of 2.8 to 3H.
Preferably, the PC/PMMA substrate has a tensile elastic modulus of 2500-2650 Mpa, and the change of the tensile elastic modulus before and after the first curing is less than 100Mpa.
Preferably, the integrated light quantity in the first UV curing in the step S1 is 700-760 mW/cm 2 Peak luminosity is 200-300 mW/cm 2 The UV light source is a high-pressure mercury lamp, and the reflecting plate is a cold mirror mode.
Preferably, the integrated light amount in the second UV curing in the step S3 is 700-760 mW/cm 2 Peak luminosity is 200-300 mW/cm 2 The UV light source is a high-pressure mercury lamp, and the reflecting plate is a cold mirror mode.
The molded base material is placed in a double-color injection molding machine after being solidified, so that the deformation of the base material can be prevented while the performance of the base material is ensured; the PC surface of the IML diaphragm is connected with the first PC plastic, so that the compatibility is improved, the transition is natural, the thickness of the transparent window is increased, the second PC/ABS plastic is used as a color development bottom layer, and the arc-shaped edge of the transparent window is injected, so that the size is controllable and accurate.
Under the condition that the raw materials and the preparation process are the same, if the base material consisting of the PMMA layer and the PC layer is subjected to high-pressure adsorption molding and 3D punching, and then the hardened coating is covered, rainbow patterns in the finished product still can be caused.
Preferably, in the step S1, the heating temperature in the high-pressure adsorption molding process is 300-330 ℃, and the molding time is 40-50S.
Preferably, the double-shot molding process in the step S2 includes: closing the injection movable mould and the fixed mould, injecting PC plastic from a pouring nozzle of a hot runner of the fixed mould part, and bonding and fusing the PC plastic and a PC surface of the PC/PMMA substrate; rotating the turntable by 180 degrees to enable the injection movable mold and the fixed mold to be closed again, and injecting PC/ABS plastic on the other side to enable the PC/ABS plastic to be bonded with the PC plastic.
Further preferably, the PC plastic material and the PC/ABS plastic material adopted in the double-shot injection molding process are required to be baked in an oven at 110 ℃ in advance for 4 hours, and the moisture of the raw materials is removed.
Further preferably, the temperature of the PC plastic material in the double-shot molding process is 280-295 ℃, and the temperature of the PC/ABS plastic material is 250-275 ℃.
Further preferably, the injection pressure in the double-shot injection molding process is 80-95 Mpa, the dwell time is 2-4 s, and the injection speed is 30-38 m/s.
The invention connects the PC surface of the IML diaphragm with the first PC plastic, increases the compatibility, has natural transition and increases the thickness of the transparent window, and the second PC/ABS plastic is used as a colored non-transparent bottom layer to be injected into the arc-shaped edge of the transparent window, and has controllable and accurate size.
Preferably, in the step S4, the cutter diameter feed amount is 2000-3000 mm/S, and the rotating speed is 20000-40000 r/S.
The invention also discloses a touch screen component with a large window, wherein the window area accounts for 70-95% of the whole touch screen panel.
Preferably, the touch screen part with the large window comprises an IML membrane layer, a PC plastic layer and a PC/ABS plastic layer;
the area of the PC plastic layer is less than or equal to the IML membrane, and the area of the PC/ABS plastic layer (colored layer) accounts for 5-30% of the area of the PC plastic layer.
Preferably, the middle of the touch screen component with the large window is a transparent large window, and the distance between the transparent window and the left side, the right side and the lower side edges of the opaque outer frame is 0.2-1.2 cm.
Preferably, the radian of the touch screen part with the large window is 0-5 degrees; the bending radian of the peripheral edge of the IML diaphragm is 70-100 degrees.
Preferably, the thickness of the IML membrane layer in the touch screen part with the large window is 0.2-0.3 cm, the thickness of the PC plastic layer is 2-4 mm, and the thickness of the PC/ABS plastic layer is 4-8 mm.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention ensures that the hardness of the surface of the touch screen part with a large window is more than 3H through twice solidification, has no rainbow lines, and prolongs the service life and improves the use experience.
2. The PC/PMMA substrate is subjected to primary solidification after high-pressure adsorption molding and 3D punching, so that good tensile property of the substrate is ensured, and the surface is smooth and has no cracks.
3. The invention carries out secondary solidification on the finished product after injection molding, further ensures the overall hardness of the finished product, does not need to cover materials such as nano coating and the like after injection molding, and does not cause rainbow lines.
4. The preparation method disclosed by the invention is simple in process, strong in controllability, low in cost, environment-friendly and high in yield.
5. The touch screen component with the large window is accurate in size, large in transparent window area and wide in application field.
Drawings
FIG. 1 is a schematic front view of a touch screen component with a large window according to the present invention.
FIG. 2 is a schematic cross-sectional view of a touch screen component of the present invention having a large window.
In the figure: 1. transparent window, 2, opaque outer frame, 11, PC/PMMA substrate (IML film), 110, PMMA layer, 111, PC layer, 12, PC plastic layer, 21, PC/ABS plastic layer.
Detailed Description
The following are specific examples of the present invention, and the technical solutions of the present invention are further described, but the present invention is not limited to these examples. The materials adopted by the invention are conventional commercial products, and the adopted method is conventional technical means unless specified.
Hardness detection criteria: JIS K5600-5-4
The model of the PC/PMMA substrate adopted by the invention is Mitsubishi CRF08U.
The preparation of the touch screen component with the large window in the invention comprises the following steps:
s1, performing high-pressure adsorption molding on a PC/PMMA substrate 11 (with the thickness of 0.25cm and the hardness of 0.26H; wherein the thickness of a PMMA layer 110 in the PC/PMMA substrate is 12 microns and the thickness of a hardening coating is 8 microns), wherein the heating temperature is 300-330 ℃, and the molding time is 40-50S;
then placing the blank on a die core of a punching die, and carrying out 3D punching;
then the first UV curing is carried out, and the integrated light quantity in the first UV curing is 700-760 mJ/cm 2 Roof topThe peak luminosity is 200-300 mW/cm 2 The UV light source is a high-pressure mercury lamp, and the reflecting plate is in a cold mirror mode; obtaining an IML membrane 11 (the hardness is 2.8-3H), and wrapping the periphery of the IML membrane 11 by 1-5 mm;
s2, placing the IML membrane in a double-color injection molding machine for double-color injection molding: the injection movable mould and the fixed mould are clamped, and PC plastic 12 is injected from a pouring nozzle of a hot runner of the fixed mould part, so that the PC plastic 12 and the PC surface of the PC/PMMA substrate 11 are bonded and fused together; then the rotary table of the double-color injection molding machine rotates 180 degrees to mold the injection movable mold and the fixed mold again, and the PC/ABS plastic 21 is injected from the hot runner pouring nozzle of the fixed mold part at the other side, so that the PC/ABS plastic 21 and the PC plastic 12 are bonded and fused together;
the PC plastic material 12 and the PC/ABS plastic material 21 are required to be baked in an oven at 110 ℃ in advance for 4 hours, and the moisture of the raw materials is removed;
the heating temperature of the raw materials of the PC plastic 12 is 280-295 ℃, and the heating temperature of the raw materials of the PC/ABS plastic 21 is 250-275 ℃;
the injection pressure is 80-95 Mpa, the dwell time is 2-4 s, and the injection speed is 30-38 m/s;
s3, carrying out secondary UV curing on the injection molded product; the integrated light quantity in the second UV curing is 700-760 mJ/cm 2 Peak luminosity is 200-300 mW/cm 2 The UV light source is a high-pressure mercury lamp, and the reflecting plate is in a cold mirror mode;
s4, placing the product on a CNC (computerized numerical control) tool, and engraving and milling the injection molding edge-extending area;
s5, sticking a protective film on the two sides of the detected product, and packaging.
The middle part of the touch screen part with the large window is a transparent window 1, the outer side of the touch screen part is an opaque outer frame 2, the area of the PC plastic layer 12 is less than or equal to the IML membrane 11, and the area of the PC/ABS plastic layer 21 accounts for 5-30% of the area of the PC plastic layer 12;
the distance between the transparent window 1 of the touch screen part with the large window and the edges of the left side, the right side and the lower side of the opaque outer frame 2 is 0.2-1.2 cm;
the radian of the touch screen part with the large window is 0-5 degrees; the bending radian of the peripheral edge of the IML diaphragm 11 is 70-100 degrees.
Example 1
The middle part of the touch screen part with the large window is a transparent window 1, the outer side is an opaque outer frame 2, the area of the transparent window 1 accounts for 80% of the total area of the touch screen part with the large window, the radian of the touch screen part with the large window is 2 degrees, and the bending radian of the surrounding edges of the IML diaphragm 11 is 93 degrees; the distance between the transparent window 1 and the edges of the left side, the right side and the lower side of the opaque outer frame 2 is 0.5cm; the front view is shown in fig. 1, and the cross-section is shown in fig. 2.
Preparation of touch screen parts with large window:
s1, sequentially carrying out high-pressure adsorption molding, 3D punching and first UV curing on a PC/PMMA substrate 11 to obtain an IML membrane (the hardness is 2.9H), wherein the periphery of the IML membrane is covered by 3mm;
the PC/PMMA substrate 11 comprises a hardening coating, a PMMA layer and a PC layer from top to bottom in sequence, wherein the hardening coating has a curing rate of 20%;
the integrated light quantity in the first UV curing is 732mJ/cm 2 Peak luminosity is 253mW/cm 2 The UV light source is a high-pressure mercury lamp, and the reflecting plate is in a cold mirror mode;
s2, placing the IML membrane in a double-color injection molding machine for double-color injection molding: the injection movable mould and the fixed mould are clamped, and PC plastic 12 is injected from a pouring nozzle of a hot runner of the fixed mould part, so that the PC plastic 12 and the PC surface of the PC/PMMA substrate 11 are bonded and fused together; rotating the turntable by 180 degrees to re-mold the injection movable mold and the fixed mold, and injecting PC/ABS plastic 21 on the other side to bond the PC/ABS plastic 21 and the PC plastic 12;
the PC plastic 12 and the PC/ABS plastic 21 are required to be baked in an oven at 110 ℃ in advance for 4 hours, and the moisture of the raw materials is removed;
the raw material heating temperature of the PC plastic 12 is 285 ℃, and the raw material heating temperature of the PC/ABS plastic 21 is 265 ℃;
the injection pressure was 87MPa, the dwell time was 3s, and the injection speed was 33m/s.
S3, carrying out secondary UV curing on the injection molded product;
the integrated light quantity in the second UV curing is 732mJ/cm 2 Peak luminosity of 253mW/cm 2 The UV light source is a high-pressure mercury lamp, and the reflecting plate is in a cold mirror mode;
s4, placing the product on a CNC (computerized numerical control) tool, and engraving and milling the injection molding edge-extending area;
s5, sticking a protective film on the two sides of the detected product, and packaging.
The hardness of the surface of the product prepared in the embodiment is more than 3H, the surface has no rainbow lines, and the yield reaches 90%.
Example 2
Preparation of touch screen parts with large window:
s1, sequentially carrying out high-pressure adsorption molding, 3D punching and first UV curing on a PC/PMMA substrate 11 to obtain an IML membrane (the hardness is 3H), wherein the periphery of the IML membrane is covered by 3mm;
the PC/PMMA substrate 11 comprises a hardening coating, a PMMA layer and a PC layer from top to bottom in sequence, wherein the hardening coating has a solidification rate of 25%;
the integrated light quantity in the first UV curing is 732mJ/cm 2 Peak luminosity is 253mW/cm 2 The UV light source is a high-pressure mercury lamp, and the reflecting plate is in a cold mirror mode;
s2, placing the IML membrane in a double-color injection molding machine for double-color injection molding: the injection movable mould and the fixed mould are clamped, and PC plastic 12 is injected from a pouring nozzle of a hot runner of the fixed mould part, so that the PC plastic 12 and the PC surface of the PC/PMMA substrate 11 are bonded and fused together; rotating the turntable by 180 degrees to re-mold the injection movable mold and the fixed mold, and injecting PC/ABS plastic 21 on the other side to bond the PC/ABS plastic 21 and the PC plastic 12;
the PC plastic 12 and the PC/ABS plastic 21 are required to be baked in an oven at 110 ℃ in advance for 4 hours, and the moisture of the raw materials is removed;
the raw material heating temperature of the PC plastic 12 is 285 ℃, and the raw material heating temperature of the PC/ABS plastic 21 is 265 ℃;
the injection pressure was 87MPa, the dwell time was 3s and the injection speed was 35m/s.
S3, carrying out secondary UV curing on the injection molded product;
the integrated light quantity in the second UV curing is 740mJ/cm 2 Peak luminosity is 269mW/cm 2 The UV light source is a high-pressure mercury lamp and a reflecting plateIs a cold mirror mode;
s4, placing the product on a CNC (computerized numerical control) tool, and engraving and milling the injection molding edge-extending area;
s5, sticking a protective film on the two sides of the detected product, and packaging.
The hardness of the surface of the product prepared in the embodiment is more than 3H, the surface has no rainbow lines, and the yield reaches 89%.
Comparative example 1
The difference from example 1 is that the PC/PMMA substrate 11 was subjected to the first UV curing and then to the high pressure adsorption molding and the 3D die cutting in sequence.
In the comparative example, the PC/PMMA substrate 11 after curing was subjected to high-pressure adsorption molding, and fine cracks appeared on the surface and the edge coating of the material, and the window size was unstable, and the yield was only 20%.
Comparative example 2
In comparison with example 1, the difference is that the double-shot molding is directly carried out, wherein the PC plastic material is MitsubishiKH3520UR (50-80 yuan/kg) was covered with a conventional UV coating (thickness 8 μm).
The surface hardness of the finished product in the comparative example is more than 3H, but the injection molding material has high cost and low yield in the preparation process.
Comparative example 3
In comparison with example 1, the difference is that the first curing is not carried out and the second curing is carried out only.
In the comparative example, the surface of the base material is easily scratched in the injection molding process, so that the finished product quality is extremely low.
Comparative example 4
In comparison with example 1, the difference is that another PC/PMMA substrate (type MRF08U, the coating has been fully cured) was used instead of PC/PMMA substrate 11, and the finished product was prepared by the high pressure adsorption molding in combination with two-shot injection molding according to the present invention.
The base material adopted in the comparative example is difficult to stretch, the size of the window is unstable, and tiny cracks are generated at the edge wrapping part; and the yield of the finished product is low, and the hardness can not meet the requirement of more than 3H.
Comparative example 5
In comparison with example 1, the difference is that the second UV curing is not carried out.
The finished product after injection molding in this comparative example was not subjected to the second UV curing, resulting in a surface hardness of 2.95H of the finished product.
In summary, the PC/PMMA substrate is subjected to the first curing after the high-pressure adsorption molding and the 3D punching, so that good stretching performance of the substrate is ensured, and the surface is smooth and has no cracks; the injection molded finished product is cured for the second time, so that the overall hardness of the finished product is further ensured, and materials such as a nano coating and the like are not required to be covered in the follow-up process, so that rainbow patterns are not caused; through twice solidification, the hardness of the surface of the touch screen part with a large window is more than 3H, no rainbow lines exist, and the service life and the use experience are improved.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (10)
1. The preparation method of the touch screen part with the large window is characterized by comprising the following steps of:
s1, sequentially carrying out high-pressure adsorption molding, 3D punching and first UV curing on a PC/PMMA substrate to obtain an IML membrane, wherein the periphery of the IML membrane is covered by 1-5 mm;
s2, placing the IML membrane in a double-color injection molding machine for double-color injection molding;
s3, carrying out secondary UV curing on the injection molded product;
s4, placing the product on a CNC (computerized numerical control) tool, and engraving and milling the injection molding edge-extending area;
s5, sticking a protective film on the two sides of the detected product, and packaging;
the PC/PMMA substrate sequentially comprises a hardening coating, a PMMA layer and a PC layer from top to bottom, wherein the hardening coating has a curing rate of 10-40%;
the hardness of the surface of the touch screen part with the large window is more than 3H, and no rainbow lines exist.
2. The method according to claim 1, wherein the total amount of light in the first UV curing in the step S1 is 700-760 mJ/cm 2 Peak luminosity is 200-300 mW/cm 2 The UV light source is a high-pressure mercury lamp, and the reflecting plate is a cold mirror mode.
3. The method according to claim 1, wherein the total amount of light in the second UV curing in the step S3 is 700-760 mJ/cm 2 Peak luminosity is 200-300 mW/cm 2 The UV light source is a high-pressure mercury lamp, and the reflecting plate is a cold mirror mode.
4. The method of claim 1, wherein the PC/PMMA substrate has a hardness of 0.26H and the IML film has a hardness of 2.8 to 3H.
5. The method according to claim 1, wherein the high pressure adsorption molding process in step S1 is performed at a heating temperature of 300 to 330 ℃ for 40 to 50 seconds.
6. The method according to claim 1, wherein the double-shot molding process in step S2 includes: closing the injection movable mould and the fixed mould, injecting PC plastic from a pouring nozzle of a hot runner of the fixed mould part, and bonding and fusing the PC plastic and a PC surface of the PC/PMMA substrate; rotating the turntable by 180 degrees to enable the injection movable mold and the fixed mold to be closed again, and injecting PC/ABS plastic on the other side to enable the PC/ABS plastic to be bonded with the PC plastic.
7. The process according to claim 6, wherein the injection pressure is 80 to 95Mpa, the dwell time is 2 to 4s, and the injection speed is 30 to 38m/s.
8. A touch screen component with a large window, characterized in that it is manufactured by the manufacturing method of claim 1, the window area occupies 70-95% of the whole touch screen panel.
9. The touch screen component with large viewing window of claim 8, wherein the touch screen component with large viewing window comprises an IML membrane layer, a PC plastic layer, a PC/ABS plastic layer; the area of the PC plastic layer is less than or equal to the IML membrane, and the area of the PC/ABS plastic layer accounts for 5-30% of the area of the PC plastic layer.
10. The touch screen component with large window according to claim 8, wherein the transparent large window is arranged in the middle of the touch screen component with large window, and the distance between the transparent window and the edges of the left side, the right side and the lower side is 0.2-1.2 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310624284.0A CN116653200A (en) | 2023-05-30 | 2023-05-30 | Preparation method of touch screen part with large window |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310624284.0A CN116653200A (en) | 2023-05-30 | 2023-05-30 | Preparation method of touch screen part with large window |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116653200A true CN116653200A (en) | 2023-08-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310624284.0A Pending CN116653200A (en) | 2023-05-30 | 2023-05-30 | Preparation method of touch screen part with large window |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116653200A (en) |
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2023
- 2023-05-30 CN CN202310624284.0A patent/CN116653200A/en active Pending
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