CN114624794B - Protective film for display screen polaroid and production method - Google Patents
Protective film for display screen polaroid and production method Download PDFInfo
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- CN114624794B CN114624794B CN202210247382.2A CN202210247382A CN114624794B CN 114624794 B CN114624794 B CN 114624794B CN 202210247382 A CN202210247382 A CN 202210247382A CN 114624794 B CN114624794 B CN 114624794B
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- 230000001681 protective effect Effects 0.000 title claims abstract description 46
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 239000010410 layer Substances 0.000 claims abstract description 65
- 239000012790 adhesive layer Substances 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims description 35
- 230000007246 mechanism Effects 0.000 claims description 27
- 238000010438 heat treatment Methods 0.000 claims description 21
- 239000002216 antistatic agent Substances 0.000 claims description 20
- 239000000853 adhesive Substances 0.000 claims description 15
- 230000001070 adhesive effect Effects 0.000 claims description 15
- 229920001577 copolymer Polymers 0.000 claims description 15
- 238000001125 extrusion Methods 0.000 claims description 15
- 229920000642 polymer Polymers 0.000 claims description 10
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 6
- 239000004814 polyurethane Substances 0.000 claims description 6
- 150000001735 carboxylic acids Chemical class 0.000 claims description 5
- -1 polyethylene terephthalate Polymers 0.000 claims description 4
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 3
- 239000005977 Ethylene Substances 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920006242 ethylene acrylic acid copolymer Polymers 0.000 claims description 3
- 229920005648 ethylene methacrylic acid copolymer Polymers 0.000 claims description 3
- 229920001903 high density polyethylene Polymers 0.000 claims description 3
- 239000004700 high-density polyethylene Substances 0.000 claims description 3
- 229920001684 low density polyethylene Polymers 0.000 claims description 3
- 239000004702 low-density polyethylene Substances 0.000 claims description 3
- HNEGQIOMVPPMNR-UHFFFAOYSA-N methylfumaric acid Natural products OC(=O)C(C)=CC(O)=O HNEGQIOMVPPMNR-UHFFFAOYSA-N 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 229920005749 polyurethane resin Polymers 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 2
- 238000013007 heat curing Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 230000008569 process Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 229920000297 Rayon Polymers 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/29—Laminated material
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/16—Optical coatings produced by application to, or surface treatment of, optical elements having an anti-static effect, e.g. electrically conducting coatings
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Laminated Bodies (AREA)
- Polarising Elements (AREA)
Abstract
The invention discloses a protective film for a display screen polaroid, which comprises an upper film, a hard film, a base film and a release film which are arranged from top to bottom, wherein the base film is fixedly connected with the hard film, the upper film and the top surface of the hard film can be separated, and the release film and the bottom surface of the base film can be separated; the middle part of the bottom surface of the basic film is provided with an intermediate adhesive layer with viscosity, and when the intermediate adhesive layer is contacted with the surface of the polaroid, the intermediate adhesive layer is connected with the surface of the polaroid in a point contact manner at different positions; the edge of the bottom surface of the base film is provided with a continuous edge bonding layer, the edge bonding layer can be in surface contact with the surface of the polaroid, and the thickness of the edge bonding layer is smaller than that of the middle bonding layer. The invention also discloses a production method of the protective film for the display screen polaroid. Compared with the prior art, the technical scheme of the invention has the advantages of convenient adhesion, antistatic property and the like, and can effectively improve the film pasting convenience, the use durability and the working reliability of the protective film.
Description
Technical Field
The invention relates to the technical field of polarizer protective films, in particular to a protective film for a display screen polarizer and a production method thereof.
Background
The polaroid is an important part of the display screen, and in order to prevent dust from directly falling on the surface of the eccentric sheet and playing a corresponding protection role, a protection film with a corresponding size is usually attached to the surface of the polaroid so as to realize the protection purpose, but the protection film is removed after the display screen is installed, so that the display screen is easily scratched due to foreign matters in the actual use process. Particularly, when a user touches the display screen for a long time, the surface of the display screen is easily worn, or when the user falls down to the ground accidentally, the display screen is easily broken.
When a user uses the display screen, in order to solve the above problems, a protective film may be re-attached to the polarizer surface of the display screen, and when the large-area protective film is attached to the display screen by a human hand, bubbles are easily remained at certain positions to cause local position bulge, so that a relatively perfect protective film effect is attached, the user is required to have a relatively skilled film attaching skill, and if the user cannot attach the protective film of the display screen, the user is required to resort to a professional film attaching mechanism to attach the film. Therefore, a protective film that can be operated by a user conveniently and has a good protective effect on a display screen is very necessary.
In addition, the surface antistatic performance of the existing protective film is relatively weak, and in the use process, dust particles with static charges such as dust are easy to attach, so that the cleanliness and the actual use effect of the surface of the protective film are affected.
Disclosure of Invention
The invention mainly aims to provide a protective film for a display screen polaroid, which is convenient to bond and resist static, and also provides a production method of the protective film for the display screen polaroid, aiming at improving the film pasting convenience, the use durability and the working reliability of the protective film.
In order to achieve the above purpose, the protective film for the display screen polaroid provided by the invention comprises an upper layer film, a hard film, a base film and a release film which are arranged from top to bottom, wherein the base film is fixedly connected with the hard film, the upper layer film is separable from the top surface of the hard film, and the release film is separable from the bottom surface of the base film; the middle part of the bottom surface of the basic film is provided with an intermediate adhesive layer with viscosity, and when the intermediate adhesive layer is contacted with the surface of the polaroid, the intermediate adhesive layer is connected with the surface of the polaroid in a point contact manner at different positions; the edge of the bottom surface of the base film is provided with a continuous edge bonding layer, the edge bonding layer can be in surface contact with the surface of the polaroid, and the thickness of the edge bonding layer is smaller than that of the middle bonding layer.
Preferably, the middle bonding layer is a plurality of protruding structures which are arranged on the bottom surface of the base film in a uniformly-spaced and dispersed manner, the outer diameter of each protruding structure is 1-100 mu m, and the gap spacing between every two adjacent protruding structures is 1-10 mu m.
Preferably, the base film is made of a high-density polyethylene material, the upper film and the release film are made of a low-density polyethylene material, the hard film is made of a polyethylene terephthalate material, the middle bonding layer is formed by mixing polymers of acrylic acid, polyurethane and epoxy resin in a mixing ratio of 1-2:2-4:1-2, the middle bonding layer is printed on the bottom surface of the base film, the middle bonding layer and the bottom surface of the base film are kept in a connected relation in an ultraviolet irradiation or heat curing mode, and the edge bonding layer is made of an acrylic acid pressure-sensitive adhesive, a polyurethane pressure-sensitive adhesive or an organosilicon pressure-sensitive adhesive.
Preferably, a polymer composed of an ethylenically unsaturated carboxylic acid is provided in the hard film as an antistatic agent, and the antistatic agent is mixed in the material of the hard film when the base film and the hard film are produced by coextrusion.
Preferably, the antistatic agent accounts for 1-30% of the weight of the hard film.
Preferably, the antistatic agent consists of one or more of ethylene acrylic acid copolymer, ethylene methacrylic acid copolymer, ethylene chloroacrylic acid copolymer, ethylene itaconic acid copolymer, ethylene maleic acid copolymer, ethylene fumaric acid copolymer, ethylene mesaconic acid copolymer.
The invention also provides a production method of the protective film for the display screen polaroid, which comprises the following steps:
step S1: the method comprises the steps of respectively placing materials of a base film and a hard film in different material cavities of an extrusion device, placing an original material of an adhesive for connecting the base film and the hard film in another cavity of the extrusion device, and integrally forming the base film and the hard film in a co-extrusion mode, wherein the adhesive fixedly connects the base film and the hard film;
step S2: the base film and the hard film after the coextrusion are heated by a plurality of independent heating cavities, and the internal heating temperatures of the heating cavities are gradually increased and then gradually decreased along the advancing direction of the base film and the hard film;
step S3: the base film and the hard film heated by all the heating cavities are in contact with a plurality of printing mechanisms which are printed alternately up and down, and the printing mechanisms print the edge bonding layer and the middle bonding layer on the bottom surface of the base film;
step S4: an ultraviolet irradiation lamp is arranged below the advancing direction of the base film, the middle bonding layer is reliably connected with the bottom surface of the base film after ultraviolet irradiation, the upper film and the release film are respectively connected with the top surface of the hard film and the bottom surface of the base film through rolling, and finally the single protective film is formed by cutting.
Preferably, the extrusion production of the hard film in the step S1 includes four working strokes, wherein the first working stroke is to stir, mix and transfer a plurality of materials into the preheating cavity through the screw structure; the mixed materials are preheated and heated and surface moisture is dried in the second working stroke; the third working stroke fully heats and fuses all materials of the hard film into a molten state; and the fourth working stroke is to convey the materials in the molten state into an extrusion die through a gear pump in a pressurizing way, and then to co-extrude and mold with the base film.
Preferably, the heating temperature of the heating cavity in the step S2 is 45-60 ℃.
Preferably, the printing means in the step S3 includes a first printing means for printing the edge bonding layer and a plurality of second printing means for printing the intermediate bonding layer; the first printing mechanism comprises a printing male die, and the printing male die compresses the edge bonding layer on the bottom surface of the base film; the second printing mechanism comprises a fixing groove for containing an adhesive and a telescopic plate capable of moving up and down, a plurality of protruding pointed bodies are arranged on the top surface of the telescopic plate, the top ends of the protruding pointed bodies are planes for temporarily storing adhesive liquid drops, and the printing areas of the protruding pointed bodies of all the second printing mechanisms are not overlapped.
Compared with the prior art, the technical scheme of the invention has the following advantages:
according to the technical scheme, the middle bonding layer is of a dispersed and tiny protruding structure, when the middle bonding layer is in contact with the polaroid of the display screen, the middle bonding layer is in a point contact mode, compared with the viscose glue integrally arranged on the bottom surface of the base film in the prior art, the contact area is reduced, and a certain gap exists between adjacent protruding structures. After the convex structures are contacted with the polaroid, bubbles between the protective film and the polaroid can flow outwards through gaps between the adjacent convex structures rapidly or through manual pushing, so that bubble residues are avoided, and the phenomenon that watermarks and rainbow display phenomena occur on the surface of a display screen during subsequent use to influence the actual display effect is avoided.
In addition, the edge bonding layer of the technical scheme of the invention is of a continuous and sealed structure, so that after the base film and the polaroid are connected, the edge bonding layer can be connected with the surface of the polaroid in a surface contact manner, the edge bonding layer can ensure air tightness, the phenomena of upward warping, separation and the like of the edge of the protective film in the actual use process are prevented, and foreign matters are prevented from entering a gap between the protective film and the polaroid.
According to the technical scheme, the polymer formed by the ethylenically unsaturated carboxylic acid is arranged in the hard film to serve as the antistatic agent, and the antistatic agent is mixed in the material of the hard film when the base film and the hard film are produced through coextrusion, so that the protective film has obvious antistatic capability in the daily use process.
In addition, the middle bonding layer and the edge bonding layer of the technical scheme of the invention are printed and formed through different printing mechanisms, wherein the printing areas of the protruding tip bodies of the second printing mechanisms are not overlapped, so that the printing accuracy can be ensured, and the printing efficiency can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic cross-sectional structure of a protective film of the present invention;
fig. 2 is a front view of the protective film of the present invention;
FIG. 3 is a schematic diagram of the operation of the method for producing a protective film of the present invention;
FIG. 4 is a schematic diagram of a second printing mechanism according to the present invention;
fig. 5 is a partial enlarged view at a in fig. 4.
Reference numerals illustrate:
1. an upper layer film; 2. a hard film; 3 a base film; 4. a release film; 5. an intermediate adhesive layer; 6. an edge bonding layer; 7. an extrusion device; 8. a heating cavity; 9. a first printing mechanism; 10. a second printing mechanism; 101. a fixing groove; 102. a telescoping plate; 103. an electric push rod; 104. protruding the tip body; 11. an ultraviolet irradiation lamp; 12. a double roller structure.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The invention provides a protective film for a display screen polarizer.
Referring to fig. 1 and 2, the protective film for a polarizer of a display screen according to an embodiment of the present invention includes an upper film 1, a hard film 2, a base film 3 and a release film 4 disposed from top to bottom, wherein the base film 3 and the hard film 2 are fixedly connected to each other, and an adhesive is disposed between the two films, so that the two films are connected to each other to form an inseparable structure, and top surfaces of the upper film 1 and the hard film 2 are detachably connected to each other, and bottom surfaces of the release film 4 and the base film 3 are detachably connected to each other. The middle part of the bottom surface of the base film 3 is provided with an adhesive middle bonding layer 5, when the middle bonding layer 5 is contacted with the surface of the polaroid, the middle bonding layer 5 is connected with the surface of the polaroid in a point contact mode at different positions, and the edge of the bottom surface of the base film 3 is provided with a continuous edge bonding layer 6, and the edge bonding layer 6 can be connected with the surface of the polaroid in a surface contact mode. In addition, the thickness of the edge bonding layer 6 of the present embodiment is smaller than the thickness of the intermediate bonding layer 5.
Preferably, the intermediate adhesive layer 5 in this embodiment is a plurality of protruding structures which are arranged on the bottom surface of the base film 3 at equal intervals in a dispersed manner, the outer diameter of the protruding structures is 1-100 μm, and the gap spacing between two adjacent protruding structures is 1-10 μm. More preferably, the cross section of the protruding structure of the present embodiment may be circular, square, or other shapes. The middle bonding layer 5 of the embodiment of the invention is in a dispersed and tiny convex structure, and is in a point contact mode when the middle bonding layer 5 is contacted with the polaroid of the display screen, so that compared with the viscose glue integrally arranged on the bottom surface of the basic film in the prior art, the contact area is reduced, and a certain gap exists between adjacent convex structures. After the middle bonding layer 5 contacts with the polaroid, bubbles between the protective film and the polaroid can flow outwards through gaps between adjacent convex structures rapidly or through manual pushing, so that bubble residues are avoided, and the phenomenon that watermarks and rainbow display phenomena occur on the surface of a display screen during subsequent use are avoided to influence the actual display effect.
In addition, the edge bonding layer 6 in the embodiment of the invention is of a continuous and sealed structure, so that after the base film and the polaroid are correctly connected, the edge bonding layer 6 can be connected with the surface of the polaroid in a surface contact manner, the edge bonding layer can ensure air tightness, the phenomena of upward edge warping, separation and the like of the protective film in the actual use process are prevented, and foreign matters are prevented from entering a gap between the protective film and the polaroid.
Preferably, the base film 3 of the present embodiment is made of a high-density polyethylene material, the upper film 1 and the release film 4 are made of a low-density polyethylene material, the hard film 2 is made of a polyethylene terephthalate material, the intermediate adhesive layer 5 is formed by mixing polymers of acrylic acid, polyurethane and epoxy resin in a mixing ratio of 1-2:2-4:1-2, the intermediate adhesive layer 5 is printed on the bottom surface of the base film 3, the intermediate adhesive layer 5 and the bottom surface of the base film 3 are kept in a connected relationship by ultraviolet irradiation or thermal curing, and the edge adhesive layer 6 is made of an acrylic acid pressure-sensitive adhesive or a polyurethane pressure-sensitive adhesive or an organosilicon pressure-sensitive adhesive.
In order to achieve that the protective film has a remarkable antistatic ability in daily use, the hard film 2 of the present embodiment is provided with a polymer composed of an ethylenically unsaturated carboxylic acid as an antistatic agent, and the antistatic agent is mixed in the material of the hard film 2 at the time of co-extrusion production of the base film 3 and the hard film 2. Preferably, the polymer antistatic agent of the embodiment of the present invention is mainly composed of an ethylenically unsaturated carboxylic acid, is dispersed and fixed in a resin at the time of molding, captures charges, and then moves inside the resin to suppress generation of static electricity. Therefore, the antistatic property has long duration, small physical property change and less severe surface property change. In addition, the antistatic agent in the hard film 2 of the present embodiment has good compatibility with the base film using polyethylene, the polymer-based antistatic agent does not cause bleeding phenomenon as compared with the surfactant-type antistatic agent, and less contamination of contact materials, particularly, no blushing or tackiness, so that the hard film 2 and the base film 3 as a whole can maintain good light transmission performance even after a long period of subsequent use without affecting the practical use performance thereof.
Preferably, the antistatic agent of the present embodiment accounts for 1 to 30% by weight of the hard film, since it is difficult to obtain antistatic properties when the content of the antistatic agent is less than 1%, and when the content exceeds 30%, it may cause an increase in cost.
Preferably, the antistatic agent of the present embodiment is composed of one or more of ethylene acrylic acid copolymer, ethylene methacrylic acid copolymer, ethylene chloroacrylic acid copolymer, ethylene itaconic acid copolymer, ethylene maleic acid copolymer, ethylene fumaric acid copolymer, ethylene mesaconic acid copolymer. The polymer antistatic agent of the embodiment is dispersed and fixed in the material of the hard film in the process of forming the hard film, so that charges and hard static electricity can be captured during subsequent use, the antistatic performance is durable, the physical property change is small, and the surface performance change is not severe.
In the embodiment of the invention, after the protective film is correctly attached to the polaroid, the upper film 1 is removed, and the hard film 2 is arranged above the base film 3, so that the surface of the protective film has better scratch resistance and wear resistance, and the surface of the hard film 2 is provided with a surface with certain matte performance, so that the protective film has the extinction characteristic of reducing reflection. The protective film for the polarizer of the display screen of the embodiment can be directly adhered to the surface of the display screen between factory leaving and sold together by manufacturers or can be conveniently adhered to the surface of the display screen by being purchased independently by users. In addition, the protective film of the technical scheme of the invention can be provided with a notch corresponding to equipment, such as a notch of equipment such as a camera, a microphone, a receiver and the like, and the notch corresponds to the size of the installation position of the equipment, so that the protective film can not influence the implementation and use functions of the protective film.
Referring to fig. 1 to 5, the present invention further provides a method for producing a protective film for a display screen polarizer, wherein materials of the base film 3 and the hard film 2 are respectively placed in different material cavities of the extrusion device 7, and raw materials of an adhesive for connecting the base film 3 and the hard film 2 are also placed in another cavity of the extrusion device 7, and the base film 3 and the hard film 2 are integrally formed by co-extrusion, wherein the adhesive fixedly connects the base film 3 and the hard film 2. The base film 3 and the hard film 2 after coextrusion are heated by a plurality of independent heating cavities 8, the internal heating temperatures of the plurality of heating cavities 8 are gradually increased and then gradually decreased along the advancing direction of the base film 3 and the hard film 2, the heating temperature of the heating cavities 8 is 45-60 ℃, and the base film 3 and the hard film 2 can be fully attached and reach a relatively flat surface by heating of the plurality of heating cavities 8. The base film 3 and the hard film 2 heated by the whole heating cavity 8, the bottom surface of the base film 3 is contacted with a plurality of printing mechanisms which are printed alternately up and down, and the printing mechanisms print the edge bonding layer 6 and the middle bonding layer 5 on the bottom surface of the base film 3. An ultraviolet irradiation lamp 11 is arranged below the advancing direction of the base film 3, the middle bonding layer 5 is reliably connected with the bottom surface of the base film 3 after ultraviolet irradiation, the upper film 1 and the release film 4 are respectively connected with the top surface of the hard film 2 and the bottom surface of the base film 3 in a rolling way through a double roller structure 12, and after being rolled up, the upper film and the release film are finally cut into a single protective film.
Preferably, the hard film 2 of the embodiment comprises four working strokes when being extruded and produced, wherein the first working stroke is used for stirring, mixing and transferring a plurality of materials into the preheating cavity through the screw structure; the mixed materials are preheated and heated and surface moisture is dried in the second working stroke; the third working stroke fully heats and fuses all materials of the hard film into a molten state; and the fourth working stroke is to convey the materials in the molten state into the extrusion die through the gear pump in a pressurizing way, ensure the stability of conveying pressure through the gear pump and then carry out coextrusion molding together with the base film.
Preferably, the printing mechanism of the present embodiment comprises a first printing mechanism 9 for printing the border adhesive layer 6 and three second printing mechanisms 10 for printing the intermediate adhesive layer 5; the first printing mechanism comprises a printing male die, and the printing male die is lifted upwards or lowered downwards through a push rod, so that the printing male die presses the edge bonding layer 6 on the bottom surface of the base film 3; referring to fig. 4 and 5, the second printing mechanism 10 includes a fixing groove 101 for containing an adhesive and a telescopic plate 102 capable of moving up and down, the fixing groove is provided with an adhesive solution, the telescopic plate 102 is moved up and down by an electric push rod 103, a plurality of protruding tips 104 are provided on the top surface of the telescopic plate 102, the top ends of the protruding tips 104 are flat surfaces for temporarily storing adhesive droplets, and the printing areas of all the protruding tips 104 of the second printing mechanism 10 are not overlapped.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the specification and drawings of the present invention or direct/indirect application in other related technical fields are included in the scope of the present invention.
Claims (4)
1. A method for producing a protective film for a display screen polarizer, comprising the steps of:
step S1: respectively placing materials of a base film and a hard film in different material cavities of an extrusion device, and placing an original material of an adhesive for connecting the base film and the hard film in another cavity of the extrusion device, wherein the base film and the hard film are integrally formed in a coextrusion mode, and the adhesive fixedly connects the base film and the hard film;
step S2: the base film and the hard film after the coextrusion are heated by a plurality of independent heating cavities, and the internal heating temperatures of the heating cavities are gradually increased and then gradually decreased along the advancing direction of the base film and the hard film;
step S3: the base film and the hard film heated by the whole heating cavity are contacted with a plurality of printing mechanisms which are printed alternately up and down, and the printing mechanisms print an edge bonding layer and a middle bonding layer on the bottom surface of the base film;
step S4: an ultraviolet irradiation lamp is arranged below the advancing direction of the base film, the middle bonding layer is reliably connected with the bottom surface of the base film after ultraviolet irradiation, the upper film and the release film are respectively connected with the top surface of the hard film and the bottom surface of the base film through rolling, and finally the single protective film is formed by cutting;
the protective film for the display screen polaroid comprises an upper layer film, a hard film, a base film and a release film which are arranged from top to bottom, wherein the base film is fixedly connected with the hard film, the upper layer film is separable from the top surface of the hard film, and the release film is separable from the bottom surface of the base film; the middle part of the bottom surface of the basic film is provided with an intermediate adhesive layer with viscosity, and when the intermediate adhesive layer is contacted with the surface of the polaroid, the intermediate adhesive layer is connected with the surface of the polaroid in a point contact manner at different positions; the edge of the bottom surface of the base film is provided with a continuous edge bonding layer, the edge bonding layer can be in surface contact with the surface of the polaroid, and the thickness of the edge bonding layer is smaller than that of the middle bonding layer;
the middle bonding layer is a plurality of convex structures which are arranged on the bottom surface of the base film in a dispersing way at equal intervals, the outer diameter of each convex structure is 1-100 mu m, and the gap interval between every two adjacent convex structures is 1-10 mu m;
the base film is made of a high-density polyethylene material, the upper film and the release film are made of a low-density polyethylene material, the hard film is made of a polyethylene terephthalate material, the middle bonding layer is formed by mixing polymers of acrylic acid, polyurethane and epoxy resin in a mixing ratio of 1-2:2-4:1-2, the middle bonding layer is printed on the bottom surface of the base film, the middle bonding layer and the bottom surface of the base film are kept in a connected relation in an ultraviolet irradiation or heat curing mode, and the edge bonding layer is made of an acrylic acid pressure-sensitive adhesive or a polyurethane pressure-sensitive adhesive or an organosilicon pressure-sensitive adhesive;
a polymer composed of an ethylenically unsaturated carboxylic acid is arranged in the hard film as an antistatic agent, and the antistatic agent is mixed in the material of the hard film when the base film and the hard film are produced by coextrusion;
the antistatic agent accounts for 1-30% of the weight of the hard film;
the antistatic agent is composed of one or more of ethylene acrylic acid copolymer, ethylene methacrylic acid copolymer, ethylene chloroacrylic acid copolymer, ethylene itaconic acid copolymer, ethylene maleic acid copolymer, ethylene fumaric acid copolymer and ethylene mesaconic acid copolymer.
2. The production method according to claim 1, wherein the extrusion production of the hard film in the step S1 includes four working strokes, wherein the first working stroke is to stir, mix and transfer a plurality of materials into the preheating chamber through a screw structure; the mixed materials are preheated and heated and surface moisture is dried in the second working stroke; the third working stroke fully heats and fuses all materials of the hard film into a molten state; and the fourth working stroke is to convey the materials in the molten state into an extrusion die through a gear pump in a pressurizing way, and then to co-extrude and mold with the base film.
3. The method of claim 1, wherein the heating temperature of the heating chamber in step S2 is 45-60 degrees celsius.
4. The production method according to claim 1, wherein the printing mechanism in step S3 includes a first printing mechanism for printing the edge bonding layer and a plurality of second printing mechanisms for printing the intermediate bonding layer; the first printing mechanism comprises a printing male die, and the printing male die compresses the edge bonding layer on the bottom surface of the base film; the second printing mechanism comprises a fixing groove for containing an adhesive and a telescopic plate capable of moving up and down, a plurality of protruding pointed bodies are arranged on the top surface of the telescopic plate, the top ends of the protruding pointed bodies are planes for temporarily storing adhesive liquid drops, and the printing areas of the protruding pointed bodies of all the second printing mechanisms are not overlapped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210247382.2A CN114624794B (en) | 2022-03-14 | 2022-03-14 | Protective film for display screen polaroid and production method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210247382.2A CN114624794B (en) | 2022-03-14 | 2022-03-14 | Protective film for display screen polaroid and production method |
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| CN114624794A CN114624794A (en) | 2022-06-14 |
| CN114624794B true CN114624794B (en) | 2024-01-26 |
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| CN114624794A (en) | 2022-06-14 |
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