CN118322623A - PET protective film for polaroid and preparation method thereof - Google Patents
PET protective film for polaroid and preparation method thereof Download PDFInfo
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- CN118322623A CN118322623A CN202410557007.7A CN202410557007A CN118322623A CN 118322623 A CN118322623 A CN 118322623A CN 202410557007 A CN202410557007 A CN 202410557007A CN 118322623 A CN118322623 A CN 118322623A
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- 238000007689 inspection Methods 0.000 claims abstract description 9
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- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims description 7
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- 239000003085 diluting agent Substances 0.000 claims description 7
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- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
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- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 4
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- Laminated Bodies (AREA)
Abstract
The invention discloses a PET (polyethylene terephthalate) protective film for a polaroid and a preparation method thereof, and relates to the technical field of PET protective film preparation, wherein the method comprises the following steps: starting a hot-press forming machine, placing the pre-dried composite layer between an upper die and a lower die of the hot-press forming machine, and tightly combining the printed PET layer with the additional layer film under the action of the hot-press forming machine to obtain a composite protective film; taking out the composite protective film from the hot press forming machine, and performing post-curing treatment in a constant temperature and constant humidity environment for 2-4 hours; and (3) performing quality inspection on the composite protective film after post-curing treatment, and removing unqualified products to obtain a PET protective film finished product. The PET protective film has moderate viscosity when being adhered to the polaroid through the prepared low-viscosity adhesive, and is not easy to fall off, and the PET protective film is not difficult to separate due to over-strong viscosity.
Description
Technical Field
The invention relates to the technical field of PET (polyethylene terephthalate) protective film preparation, in particular to a PET protective film for a polaroid and a preparation method thereof.
Background
With the rapid development of display technology, liquid crystal display screens are widely used in a plurality of electronic devices, such as mobile phones, televisions, computers, etc. The polaroid is an important component in the liquid crystal display screen and is used for controlling the transmission direction of light rays and ensuring the normal operation of the display screen. However, the polarizer is easily damaged by scratches, contamination, etc. during production, transportation, and use, and thus it is required to protect it using a PET protective film.
The tackiness of conventional PET protective films is derived from the adhesive on the back side thereof. However, these conventional adhesives may cause insufficient adhesion between the protective film and the polarizer, and thus, may directly affect the use effect of the protective film due to insufficient adhesion, such as easy displacement or falling off when subjected to external force, thereby losing the protective effect.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide the PET protective film for the polaroid and the preparation method thereof, and the PET protective film has moderate viscosity when being adhered to the polaroid through the prepared low-viscosity adhesive, is not easy to fall off, and is not difficult to separate due to the over-strong viscosity.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in a first aspect, a method for preparing a PET protective film for a polarizer, the method comprising the steps of:
step 1, printing a patterned coating on one surface of a preformed PET layer to obtain a printed PET layer;
Step 2, preparing low-viscosity adhesive, coating the low-viscosity adhesive on the printed PET layer subjected to corona treatment to form a low-viscosity adhesive layer, aligning the printed PET layer coated with the low-viscosity adhesive with an additional layer film, bonding the printed PET layer and the additional layer film together through the low-viscosity adhesive to obtain a composite layer, and pre-drying the composite layer in an oven at 70 ℃ to preliminarily cure the low-viscosity adhesive layer;
step 3, starting a hot-press forming machine, placing the pre-dried composite layer between an upper die and a lower die of the hot-press forming machine, and tightly combining the printed PET layer with the additional layer film through the action of the hot-press forming machine to obtain a composite protective film;
Step 4, taking out the composite protective film from the hot press forming machine, and performing post-curing treatment in a constant temperature and constant humidity environment for 2-4 hours;
and 5, performing quality inspection on the composite protective film after post-curing treatment, and removing unqualified products to obtain a PET protective film finished product.
Furthermore, the coating is formed by mixing acrylic resin, pigment and diluent according to the mass ratio of 5:3:2.
Further, the low-viscosity adhesive consists of the following formula:
60-80 parts of ethyl acrylate, 20-40 parts of butyl acrylate, 5-15 parts of acrylic acid, 1-5 parts of cross-linking agent, 0.1-1 part of emulsifying agent, 40-60 parts of deionized water, 5-15 parts of tackifier, 1-3 parts of stabilizing agent, 2-6 parts of thixotropic agent, 0.5-2 parts of accelerator, 10-30 parts of filler and 1-5 parts of anti-aging agent.
Further, the cross-linking agent is N-methylolacrylamide.
Further, the hot press molding temperature is 90-100 ℃, the pressure is 60-80kg/cm < 2 >, and the hot press molding time is 60-100 seconds.
Furthermore, the tackifier is rosin resin, the stabilizer is an antioxidant, the thixotropic agent is fumed silica or organic bentonite, the promoter is a metal salt compound, and the filler is nano calcium carbonate or talcum powder.
Further, the metal salt compound is disodium ethylenediamine tetraacetate.
Further, the pigment is iron oxide.
Further, the pigment is ferric oxide and the diluent is methyl ethyl ketone.
In a second aspect, a PET protective film for a polarizer is prepared by the preparation method.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
the PET protective film has moderate viscosity when being adhered to the polaroid through the prepared low-viscosity adhesive, and is not easy to fall off, and can not be separated easily due to over-strong viscosity. The printed PET layer and the additional layer film can be tightly combined to form a whole through the treatment of the hot press forming machine, so that the strength and the durability of the protective film are improved. The PET protective film has excellent weather resistance due to the selected materials and the preparation process, can keep stable performance under different environmental conditions, and prolongs the service life of the protective film. By printing the pattern on the PET layer, the aesthetic property of the protective film is increased, and the personalized pattern can be customized according to the requirements of customers.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, it being obvious that the drawings described below are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a schematic perspective view of a PET protective film for a polarizer.
Fig. 2 shows a flowchart of a method for manufacturing a PET protective mold for a polarizer.
Fig. 3 shows a schematic perspective view of the entire hot press molding apparatus.
Fig. 4 shows a front view of a sealing plate and a mounting seat of the thermo-compression molding apparatus.
Fig. 5 is a schematic perspective view showing a cross section of a lower die of the hot press forming apparatus.
Fig. 6 shows a schematic perspective view of a cone block and seal plug combination of a hot press molding apparatus.
Fig. 7 shows a schematic view of the structure at E in fig. 5.
FIG. 8 is a schematic view showing a cross-sectional perspective structure of an upper die of the hot press forming apparatus;
fig. 9 is a schematic perspective view showing a heating wire of the hot press forming apparatus;
FIG. 10 is a schematic perspective view of a closure plate of the hot press forming apparatus;
Fig. 11 is a schematic perspective view showing a combination of a lower die, a pushing part and a driving part of the hot press forming apparatus.
FIG. 12 shows a schematic diagram of the structure at C in FIG. 10;
fig. 13 shows a schematic perspective view of a connecting bar of a hot press molding apparatus;
Fig. 14 shows a schematic perspective view of a U-frame of the hot press forming apparatus;
FIG. 15 shows a schematic view of the structure at B in FIG. 12;
FIG. 16 shows a schematic view of the structure at D in FIG. 11;
FIG. 17 shows a schematic view of an exploded perspective view of a collection member of a hot briquetting apparatus;
fig. 18 is a schematic perspective view showing a driving part of the thermo-compression molding apparatus;
FIG. 19 shows a schematic view of the structure at A in FIG. 18;
Legend description: 1. a frame; 101. a base; 102. a semi-cylinder; 103. a guide rod; 104. a top plate; 2. a hydraulic rod; 201. a pressing plate; 202. guide sleeve; 203. a mounting base; 204. an upper die; 205. a sealing plate; 206. an n-type magnet; 207. heating wires; 3. a lower die; 301. a side plate; 302. an inner tank; 303. a slot; 304. an air bag; 305. a first push plate; 306. a connecting plate; 307. u-shaped iron; 308. a one-way valve; 4. a sleeve; 401. a hack lever; 402. an air port; 403. a cone block; 404. a positioning sleeve; 405. a first spring; 406. sealing the plug cover; 5. a U-shaped frame; 501. a supporting plate; 502. a second spring; 503. a shovel plate; 504. a connecting strip; 505. a longitudinal bar; 506. fixing plates; 507. a rotating rod; 508. a seesaw; 509. iron bars; 510. a first compression bar; 511. an electromagnet; 512. a switch; 6. a bracket; 601. a motor; 602. an L plate; 603. a roller; 604. a support block; 605. a rotating roller; 606. a belt wheel; 607. a belt; 608. iron sheet; 7. a cotton brush; 701. a fixing plate; 702. a mounting plate; 703. a cotton sliver; 704. a movable opening; 705. a support plate; 706. a third spring; 707. a arch plate; 708. a baffle; 709. a positioning cover; 710. a rolling rod; 711. a storage box; 712. a pull ring; 8. PET release film; 801. a pressure sensitive adhesive; 802. a PET film.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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.
Example 1
The PET protective film for the polarizer of the embodiment is prepared according to the following steps:
Printing a coating consisting of acrylic resin, ferric oxide pigment and methyl ethyl ketone diluent (mass ratio of 5:3:2) on the preformed PET layer to obtain a printed PET layer;
The low-viscosity adhesive is prepared from 70 parts by weight of ethyl acrylate, 30 parts by weight of butyl acrylate, 10 parts by weight of acrylic acid, 3 parts by weight of N-methylol acrylamide serving as a cross-linking agent, 0.5 part by weight of an emulsifying agent, 50 parts by weight of deionized water, 10 parts by weight of rosin resin serving as a tackifier, 2 parts by weight of an antioxidant serving as a stabilizer, 4 parts by weight of fumed silica serving as a thixotropic agent, 1 part by weight of disodium ethylenediamine tetraacetate serving as an accelerator, 20 parts by weight of nano calcium carbonate serving as a filler and 3 parts by weight of an anti-aging agent. The low adhesion was coated onto the corona treated printed PET layer, aligned with the additional layer film and bonded to give a composite layer. Pre-drying the composite layer in a 70 ℃ oven;
Placing the pre-dried composite layer in a hot press forming machine, and hot press forming for 75 seconds at the temperature of 95 ℃ and the pressure of 70kg/cm 2 to obtain a composite protective film;
post-curing the composite protective film for 3 hours in a constant temperature and humidity environment;
And (5) performing quality inspection to obtain a PET protective film finished product.
Example 2
The PET protective film for the polarizer of the embodiment is prepared according to the following steps:
Printing a pattern coating on the preformed PET layer, wherein the coating consists of acrylic resin, ferric oxide pigment and methyl ethyl ketone diluent (mass ratio is the same as above);
The low-viscosity adhesive is prepared from 60 parts by weight of ethyl acrylate, 40 parts by weight of butyl acrylate, 5 parts by weight of acrylic acid, 5 parts by weight of N-methylolacrylamide, 0.1 part by weight of an emulsifier, 60 parts by weight of deionized water, 5 parts by weight of rosin resin, 3 parts by weight of an antioxidant, 2 parts by weight of organic bentonite, 2 parts by weight of disodium ethylenediamine tetraacetate, 10 parts by weight of talcum powder and 5 parts by weight of an anti-aging agent. Coating, alignment, bonding and predrying as in example 1;
the hot press molding condition is 90 ℃, 60kg/cm 2 and 100 seconds;
post-curing for 2 hours;
And (5) quality inspection to obtain a finished product.
Example 3
The PET protective film for the polarizer of the embodiment is prepared according to the following steps:
the printing coating procedure was the same as in example 1;
The low-viscosity adhesive is prepared from 80 parts by weight of ethyl acrylate, 20 parts by weight of butyl acrylate, 15 parts by weight of acrylic acid, 1 part by weight of N-methylolacrylamide, 1 part by weight of emulsifier, 40 parts by weight of deionized water, 15 parts by weight of rosin resin, 1 part by weight of antioxidant, 6 parts by weight of fumed silica, 0.5 part by weight of disodium ethylenediamine tetraacetate, 30 parts by weight of nano calcium carbonate and 1 part by weight of anti-aging agent. Coating, alignment, bonding and predrying as in example 1;
The hot press molding condition is 100 ℃, 80kg/cm 2 and 60 seconds;
post-curing for 4 hours;
And (5) quality inspection to obtain a finished product.
Example 4
The PET protective film for the polarizer of the embodiment is prepared according to the following steps:
the printing coating procedure is as in example 1, wherein iron oxide is used as pigment;
The low-viscosity adhesive is prepared from 75 parts by weight of ethyl acrylate, 25 parts by weight of butyl acrylate, 12 parts by weight of acrylic acid, 2 parts by weight of N-methylolacrylamide, 0.8 part by weight of an emulsifying agent, 45 parts by weight of deionized water, 8 parts by weight of rosin resin, 2.5 parts by weight of an antioxidant, 3 parts by weight of organic bentonite, 1.5 parts by weight of disodium ethylenediamine tetraacetate, 15 parts by weight of talcum powder and 4 parts by weight of an anti-aging agent. Coating, alignment, bonding and predrying as in example 1;
The hot press molding conditions are 92 ℃, 75kg/cm 2 and 70 seconds, the post curing treatment is carried out for 3.5 hours, and the quality inspection is carried out, thus obtaining the finished product.
Example 5
The PET protective film for the polarizer of the embodiment is prepared according to the following steps:
the printing coating procedure was the same as in example 1;
The low-viscosity adhesive is prepared from 65 parts by weight of ethyl acrylate, 35 parts by weight of butyl acrylate, 8 parts by weight of acrylic acid, 4 parts by weight of N-methylol acrylamide, 0.3 part by weight of an emulsifier, 55 parts by weight of deionized water, 6 parts by weight of rosin resin, 1.8 parts by weight of an antioxidant, 5 parts by weight of fumed silica, 1 part by weight of disodium ethylenediamine tetraacetate, 25 parts by weight of nano calcium carbonate and 2 parts by weight of an anti-aging agent. Coating, alignment, bonding and predrying as in example 1;
The hot press molding conditions are 98 ℃, 65kg/cm 2 and 90 seconds, the post curing treatment is carried out for 2.5 hours, and the quality inspection is carried out, thus obtaining the finished product.
Comparative example
The traditional PET protective film for the polaroid is prepared by the following steps:
The coating is formed by mixing polyurethane resin, titanium pigment and ethyl acetate diluent according to the mass ratio of 4:4:3.
The adhesive formula comprises the following components: 40 parts by weight of vinyl acetate, 30 parts by weight of ethyl acrylate, 15 parts by weight of methyl methacrylate, 5 parts by weight of maleic anhydride, 10 parts by weight of polyvinylpyrrolidone as a thickener, 2 parts by weight of sodium dodecyl sulfate as an emulsifier, 40 parts by weight of deionized water, and 3 parts by weight of a silane coupling agent as an adhesion promoter.
According to the adhesive formula, the components are fully and uniformly mixed in a stirring kettle to prepare a novel adhesive, the adhesive is uniformly coated on a printing PET layer in a scraper coating mode, and then the other PET film is flatly paved on the printing PET layer coated with the adhesive, so that no air bubble exists between the two layers; the composite layer is exposed to electron beam or ultraviolet radiation to crosslink the polymer in the adhesive.
And (3) placing the radiation crosslinked composite layer for a period of time under the constant temperature and humidity condition, performing quality inspection on the cured composite protective film, removing unqualified products, and cutting the qualified products into specified sizes according to the requirements of customers.
Examples 1 to 5 use specific acrylic adhesive formulations and have excellent adhesion and weather resistance as compared to comparative examples. In contrast, the adhesives of the comparative examples were inferior in adhesion and durability, and the hot press molding process of examples 1 to 5 was relatively mature and high in production efficiency. While the radiation crosslinking step in the comparative example may require a longer processing time and special equipment, increasing production costs and time. The hot press forming process in examples 1 to 5 can ensure uniform and stable curing of the adhesive layer between the PET films, reducing the possibility of delamination or air bubbles of the product during use. The new process in the comparative example may require additional control measures to ensure product stability.
As shown in fig. 3 and 19, the hot press forming device includes a frame 1 and a mounting base 203, a lower mold 3 is disposed between the frame 1 and the mounting base 203, and the hot press forming device further includes:
A top film part arranged on the lower die 3 and the mounting seat 203 and used for jacking up the composite protective film in the lower die 3 by utilizing gas;
A film pushing part arranged at one side of the lower die 3 and used for pushing out the composite protective film;
the driving part is arranged on one surface of the frame 1 close to the lower die 3 and is used for driving the film pushing part to move and pushing the pushed PET protective film;
The cleaning part is arranged on the film pushing part and the lower die 3 and is used for cleaning and collecting the residual materials on the lower die 3;
The top film part comprises a transmission part and a jacking part, the transmission part is used for transmitting moving power to the jacking part, the jacking part is used for jacking the composite protective film in the lower die 3 by utilizing gas, the film pushing part is used for jacking the PET protective film on the top film part and then is connected with the driving part, and the cleaning part is used for providing moving support for the residual materials and simultaneously facilitating the movement of the transmission part.
Specifically, a base 101 is arranged on one surface of the frame 1 close to the lower die 3, the base 101 is fixed on one surface of the lower die 3 far away from the pressing plate 201, four semi-cylinders 102 are fixed on one surface of the frame 1 close to the base 101, a guide rod 103 is fixed on one end of the four semi-cylinders 102 far away from the frame 1, and a top plate 104 is fixed on the outer side of the guide rod 103;
The frame 1 can make things convenient for the staff to place hot briquetting device to job site department, and frame 1 can firmly support base 101, and base 101 can provide firm support for bed die 3, and frame 1 can firmly support the semicylinder, and semicylinder 102 is used for supporting guide arm 103, and guide arm 103 and semicylinder 102 cooperation can provide the removal guide effect for guide pin bushing 202, and guide arm 103 can firmly support roof 104.
Specifically, the hydraulic rod 2 is fixedly penetrated in the top plate 104, one end of the hydraulic rod 2, which is close to the lower die 3, is fixedly provided with the pressing plate 201, one surface of the pressing plate 201, which is close to the lower die 3, is fixedly connected with one surface, which is far away from the lower die 3, of the mounting seat 203, four guide sleeves 202 are fixedly penetrated in the pressing plate 201, the four guide sleeves 202 are respectively positioned on the outer sides of the guide rods 103, one surface, which is far away from the pressing plate 201, of the mounting seat 203 is fixedly provided with the upper die 204, and the electric heating wires 207 are embedded in the upper die 204.
In the practical application process, the top plate 104 can provide a through channel and a supporting function for the hydraulic rod 2, the hydraulic rod 2 can firmly support the pressing plate 201, the pressing plate 201 can provide a support for the mounting seat 203 through the fixing component, the mounting seat 203 firmly supports the upper die 204, the mounting seat 203 can provide a firm user support for the sealing plate 205, the upper die 204 can provide a firm support for the heating wire 207, the heating wire 207 can generate heat to heat the upper die 204 after being electrified, the hydraulic rod 2 can be stretched under the operation of a worker, the pressing plate 201 is pushed by utilizing the telescopic end, the pressing plate 201 moves in the direction of the lower die 3 under the action of the external force and the guiding action of the guide sleeve 202, the guide rod 103 and the semi-cylinder 102, and then the pressing plate 201 drives the upper die 204 and the sealing plate 205 to move in the direction of the lower die 3 together through the mounting seat 203, meanwhile, the worker needs to place the material of the hot-press forming PET protective film into the lower die 3, the upper die 204 is matched with the lower die 3, and simultaneously the heating wire 207 is started to heat the upper die 204, the upper die 204 is tightly combined with the PET layer and the film protective film by the upper die 204 and the lower die 3.
As a preferred embodiment of the present invention, the transmission member includes:
The sealing plates 205 are fixed on one surface of the mounting seat 203, which is close to the upper die 204, and are positioned on two sides of the upper die 204;
an n-type magnet 206 fixed to one end of the sealing plate 205 away from the mounting base 203;
An inner groove 302 provided in the lower mold 3;
a slot 303 which is formed on one surface of the lower mold 3 close to the upper mold 204 and is communicated with the inner groove 302;
a first push plate 305 movably disposed inside the inner tank 302;
the connecting plates 306 are fixed at two ends of the first push plate 305, which are close to the slots 303;
U-shaped iron 307 is inlaid on one surface of connecting plate 306 close to inner groove 302 and corresponds to the position of n-type magnet 206;
the position of the slot 303 corresponds to the position of the sealing plate 205.
Specifically, the sealing plate 205 can firmly support the n-type magnet 206 under the support of the mounting seat 203, the n-type magnet 206 is made of iron, the U-type iron 307 has magnetism, the U-type iron 307 can adsorb the n-type magnet 206 when contacting with the n-type magnet 206, the lower mold 3 can provide a space for opening the inner groove 302, the inner groove 302 can provide a moving space for the air bag 304, the first push plate 305, the connecting plate 306 and the U-type iron 307, the lower mold 3 can provide a space for opening the slot 303, and the slot 303 can provide a channel for inserting the sealing plate 205 into the inner groove 302 through the lower mold 3.
The jack-up piece includes:
the air bag 304 is fixed on one surface of the first push plate 305 far away from the frame 1, and one surface of the air bag 304 far away from the first push plate 305 is fixedly connected with the lower die 3;
A check valve 308 fixedly installed through one side of the airbag 304;
the jacking part penetrates through the air bag 304 and one surface of the lower die 3, which is far away from the frame 1, and is used for exhaust sealing work.
Specifically, the first push plate 305 can provide support for the air bag 304, and the lower mold 3 can firmly support one side of the air bag 304 away from the first push plate 305, and the air bag 304 can firmly support the one-way valve 308, the one-way valve 308 can provide a channel for air outside the air bag 304 to enter the air bag 304, the air in the air bag 304 cannot pass through the one-way valve 308 to be discharged to the outside, the air bag 304 can provide a storage space for the air, and can deform under the action of the external force, and the air bag can rebound after the external force disappears.
The jacking part comprises:
the sleeve 4 penetrates through the air bag 304 and is fixedly connected with one surface of the lower die 3, which is far away from the frame 1;
the hack lever 401 is symmetrically fixed on the inner side of the sleeve 4;
an air port 402 formed through the inside of the frame bar 401;
the cone block 403 is fixed at one end of the hack lever 401 near the center line of the sleeve 4;
the positioning sleeve 404 is fixed at one end of the cone block 403 far away from the air bag 304;
a first spring 405 fixed at one end of the cone block 403 away from the air bag 304 and located inside the positioning sleeve 404;
A seal plug cover 406 fixed to one end of the first spring 405 away from the taper block 403 and fitted inside the sleeve 4;
In the practical application process, the air bag 304 and the lower die 3 can provide stable support for the sleeve 4, the sleeve 4 can provide support for the hack lever 401, the hack lever 401 can provide opening space for the air port 402, the air port 402 can provide a penetrating channel for air, the hack lever 401 can stably support the cone block 403, the bottom end of the cone block 403 is sharp, resistance to air can be reduced, the cone block 403 can provide support for the positioning sleeve 404, the cone block 403 can stably support the first spring 405, the positioning sleeve 404 can provide limit effect for the first spring 405, the first spring 405 has certain elasticity, can stretch and deform under the action of external force, can rebound after the external force disappears, the sealing plug cover 406 can close the opening of the sleeve 4 under the support of the first spring 405, and can stretch the first spring 405 to deform and store energy under the pushing of air;
The n-type magnet 206 pushes the baffle 708 under the action of external force and under the support of the support plate 705 and the lower die 3, so that the baffle 708 pushes the arch plate 707 under the action of external force, and the arch plate 707 pushes the third spring 706 to bend and deform under the action of external force and under the support of the support plate 705, so that the baffle 708 moves to the inner side of the movable opening 704, and the opening of the slot 303 is opened;
When the upper mold 204 moves into the lower mold 3 to press the PET layer and the additional layer film, the mounting base 203 drives the n-type magnet 206 to move together through the sealing plate 205 under the action of external force, so that the sealing plate 205 pushes the n-type magnet 206 to be inserted into the inner side of the slot 303 and be inserted into the inner side of the inner groove 302 along the slot 303, and then the n-type magnet 206 is pushed by the sealing plate 205 to be inserted into the inner side of the U-type iron 307, so that the U-type iron 307 is magnetically attracted on the n-type magnet 206;
When the upper die 204 moves away from the lower die 3 and returns to its original position after hot press molding, the mounting seat 203 drives the n-type magnet 206 to move away from the lower die 3 together through the sealing plate 205, so that the n-type magnet 206 pulls the U-shaped iron 307 along the inner groove 302 to move towards the direction close to the slot 303 by utilizing the magnetic force under the action of external force, meanwhile, the U-shaped iron 307 pulls the first push plate 305 through the connecting plate 306 under the action of external force, so that the first push plate 305 moves towards the direction close to the upper die 204 and presses the air bag 304, the air bag 304 deforms under the action of the pressing force and pushes gas on the inner side of the air bag 4, then the gas pushes the sealing plug 406 through the air port 402 under the guiding action of the sleeve 4, so that the sealing plug 406 moves away from the air bag 304, and moves out of the sleeve 4 to open the opening of the sleeve 4, and then the gas passes through the sleeve 4 to be discharged to the side of the lower die 3 away from the frame 1, so that the gas and the sealing plug 406 can jack the composite protective film on the lower die 3, so that the composite protective film is separated from the lower die 3, and the composite protective film is prevented from the upper die 3, and the composite protective film is difficult to adhere to the lower die 3.
When the n-type magnet 206 is pulled out from the inner side of the slot 303, the n-type magnet 206 is separated from the U-shaped iron 307, then the air bag 304 pushes the first push plate 305 in a direction away from the upper die 204 by using a rebound force, so that the first push plate 305 drives the connecting plate 306 and the U-shaped iron 307 to move together under the action of an external force, at the moment, the external air passes through the slot 303 and the inner groove 302 to enter the inner side of the one-way valve 308 and passes through the one-way valve 308 to be filled into the inner side of the air bag 304, and meanwhile, the thrust to the sealing plug cover 406 is released, so that the first spring 405 is contracted by using the rebound force under the support of the cone block 403, and pulls the sealing plug cover 406 to be plugged into the inner side of the sleeve 4 to close the opening of the sleeve 4 and be flush with one side of the lower die 3 away from the frame 1;
As a preferred embodiment of the present invention, the film pushing part includes a frame spring for supporting the actuator and facilitating the rebound and homing of the actuator, and the actuator for pushing the composite PET protective film in the lower mold 3 by an external force, the frame spring comprising:
the side plates 301 are provided with two side plates 301, and the two side plates 301 are fixed on one surface of the lower die 3, which is far away from the frame 1;
a U-frame 5 fixed to one side of the side plate 301;
the two supporting plates 501 are symmetrically fixed on the inner side of the U frame 5;
and a second spring 502 fixed on the inner wall of one end of the U frame 5 far away from the side plate 301.
Specifically, the lower die 3 can provide firm support for the curb plate 301, the curb plate 301 can be for playing the spacing effect of protection, shrouding 205, curb plate 301 and lower die 3 cooperation can provide the shaping space for the PET protection film, curb plate 301 can provide firm support U frame 5 under the support of lower die 3, U frame 5 can provide firm support for layer board 501, layer board 501 can provide space and supporting role for shovel push pedal 503, U frame 5 can firm support second spring 502, second spring 502 has certain elasticity, can stretch deformation under the effect of external force, then can rebound after the external force disappears.
The actuator includes:
A shovel plate 503 placed inside the two pallets 501;
a connecting bar 504 fixed on the side of the shovel plate 503 away from the side plate 301;
a longitudinal bar 505 fixed to a side of the connecting bar 504 away from the frame 1;
A fixed plate 506, one end of which is fixed on the outer side of the vertical rod 505, and the other end of which is fixedly connected with one surface of the connecting strip 504 away from the frame 1;
A rotating rod 507 fixed to one side of the fixed plate 506 near the side plate 301;
the rocker 508 is rotatably sleeved on the outer side of the rotating rod 507;
iron bar 509 fixed to the end of rocker 508 near shovel plate 503;
the first compression bar 510 is rotatably connected with one end of the rocker 508 away from the iron bar 509 and is positioned at the outer side of the side plate 301;
the electromagnet 511 is fixed at one end of the first compression bar 510 away from the rocker 508;
a switch 512 is provided at a direction of the lower die 3 away from the blade 503.
In the practical application process, the second spring 502 can provide support for the fixed plate 506, the fixed plate 506 can firmly support the vertical rod 505 and the rotating rod 507, the vertical rod 505 and the fixed plate 506 cooperate to provide stable support for the connecting bar 504, the connecting bar 504 can provide support for the shovel plate 501, the rotating rod 507 can provide rotary support for the seesaw, the rocker 508 can firmly support the iron bar 509, the n-type magnet 206 can contact with the iron bar 509 when being pulled out from the slot 303 to move away from the rack 1, the iron bar 509 is pushed by magnetic force, the rocker 508 can rotate with the rotating rod 507 as a center of a circle under the action of external force and the support of the fixed plate 506, the rocker 508 can firmly support the electromagnet 511 by the first compression rod 510, the electromagnet 511 can generate magnetic force when being electrified, the magnetic force can be eliminated when the electromagnet 511 is powered off, the switch 512 can spring up in a natural state, the electromagnet 511 can be electrified when the switch 512 is pressed down, the electromagnet 511 can be powered off, and the first compression rod 510 can rotate under the action of gravity and keep perpendicular to the rack 1.
When the upper die 204 is driven by the mounting seat 203 to move away from the lower die 3 and the n-type magnet 206 is driven by the sealing plate 205 to be pulled out from the inner side of the slot 303, the n-type magnet 206 drives the sealing plate 205 to push the iron bar 509 in the direction close to the upper die 204 by utilizing magnetic force, so that the iron bar 509 pushes the rocker 508 under the action of external force, the rocker 508 rotates in the direction close to the electromagnet 511 by taking the rotating rod 507 as the center of a circle under the action of external force and the support of the fixed plate 506, the rocker 508 pushes the first compression rod 510, and meanwhile, the first compression rod 510 pushes the electromagnet 511 to move towards the machine frame 1 by the action of external force, so that the electromagnet 511 is in contact with the iron sheet 608 and is adsorbed on the iron sheet 608 by utilizing the magnet.
Further, the driving part includes a support member for supporting the driving member and a driving member for transmitting power, the support member including:
a bracket 6 fixed to one surface of the frame 1 near the base 101 through a connecting member; and is located outside the base 101;
an L-plate 602 fixed to a side of the side plate 301 away from the U-frame 5;
a motor 601 fixed on a surface of the bracket 6 away from the L plate 602, and an output end of the motor 601 rotates through the bracket 6;
a support block 604 is fixed to one side of the half cylinder 102 near the electromagnet 511.
Specifically, the support 6 can stably support the motor 601 under the support of the frame 1, the side plate 301 can stably support the L plate 602 under the support of the lower mold 3, the L plate 602 can provide a rotation support for the roller 603, the motor 601 can drive the roller 603 to rotate after being started, the semi-cylinder 102 can stably support the supporting block 604, and the supporting block 604 can provide a rotation support for the roller 605.
The driving member includes:
The roller 603 is fixedly arranged at the output end of the motor 601, and the roller 603 is rotationally connected with the L plate 602;
A rotating roller 605 rotating through the inner installation of the stay block 604;
a belt wheel 606 fixedly sleeved on the outer sides of the roller 603 and the rotary roller 605;
a belt 607 fitted around the outside of the pulley 606;
iron sheet 608 is inlaid on the outer side of belt 607.
In the practical application process of the embodiment, the roller 603 and the roller 605 can provide stable support for the belt 606, the belt 606 can provide a sheathing space for the belt 607, the belt 607 can transmit the rotation power of the roller 603 to the roller 605 by using the belt 606, the belt 607 can stably support the iron sheet 608, a worker can start the motor 601 according to the actual situation, the motor 601 drives the roller 603 to rotate clockwise by using the output end under the support of the bracket 6 and the roller 603 under the support of the L plate 602, the roller 603 drives the belt 606 sheathed outside the roller 603 to rotate clockwise, the belt 606 can transmit the rotation power to the belt 607 by using friction force, the belt 607 drives the belt 606 sheathed outside the roller 605 to rotate clockwise by using the external force, the belt 607 transmits the rotation power to the roller 605, the roller 605 rotates clockwise by using the external force and the support of the support block 604, the belt 607 can drive the iron sheet 608 to rotate together under the support of the rotating roller 605, the rolling roller 603 and the belt wheel 606, the iron sheet 608 can further drive the electromagnet 511 to translate towards the direction approaching the rolling roller 603 by utilizing the magnetic force of the electromagnet 511 under the action of external force, meanwhile, the electromagnet 511 can drive the rocker 508 through the first compression bar 510 under the action of external force, the rocker 508 can drive the fixed plate 506 through the rotating bar 507 under the action of external force, the fixed plate 506 can drive the second spring 502 to elongate and store energy under the action of external force and the support of the U frame 5, the fixed plate 506 can drive the shovel push plate 503 to move together through the longitudinal bar 505 and the connecting bar 504, the shovel push plate 503 can move inwards from the supporting plate 501 to the side of the lower die 3 away from the frame 1, and move together with the fixed plate 506 along the direction approaching the rolling roller 603 along the lower die 3, and then make shovel push pedal 503 can utilize external force and self sharp end to shovel the compound PET protection film after the inner top film of bed die 3 in the removal in-process to resist and promote compound PET protection film under the effect of external force and remove from bed die 3 to the direction that is close to roll 603, then compound PET protection film can remove the one side that roll 603 kept away from frame 1 to roll 603, makes roll 603 cooperate frictional force to push compound PET protection film to remove the discharge to the direction that is kept away from U frame 5 under the rotation power effect and supplies the staff to collect, thereby realize automatic discharge compound PET protection film.
As a preferred embodiment of the present invention, the cleaning part includes a cleaning member for cleaning the remnants in the lower mold 3 following the movement of the supporting member, and a collecting member for collecting the cleaned remnants, the cleaning member including:
A cotton brush 7 fixed on the surface of the connecting strip 504 far away from the longitudinal rod 505;
a fixing plate 701 fixed on one surface of the connecting bar 504 away from the shovel plate 503;
a mounting plate 702 fixed to a surface of the fixing plate 701 adjacent to the frame 1 by a fixing member;
a cotton sliver 703, which has two cotton slivers, is fixedly connected to one surface of the mounting plate 702, which is close to the frame 1;
And a protection part arranged on the lower die 3 and positioned in a direction close to the roller 603 for preventing the cleaned residue from falling into the slot 303.
Specifically, the connecting strip 504 can firmly support the cotton brush 7, the cotton brush 7 can deform under the action of external force, the cotton brush 7 can rebound under the action after the external force disappears, the cotton brush can be contacted with the lower die 3 in the moving process and brush down the residual materials adhered on the lower die 3, the fixing plate 701 can provide a penetrating channel for the fixing part under the support of the connecting strip 504, a worker can utilize the fixing part to penetrate through the fixing plate 701 to fix the mounting plate 702 to the surface of the fixing plate 701 close to the frame 1, the mounting plate 702 can provide firm support for the cotton sliver 703, the cotton sliver 703 is softer and can deform under the action of external force, the cotton sliver 703 can rebound after the external force disappears, the residual materials brushed down by the cotton brush 7 can be pushed to move, the fixing effect on the mounting plate 702 can be relieved according to the requirement of actual conditions, and the mounting plate 702 and the cotton sliver 703 can be conveniently taken down to clean the cotton sliver 703.
When the connecting strip 504 drives the shovel push plate 503 to move, the connecting strip 504 drives the cotton sliver 703 to move together through the fixing plate 701, the fixing component and the mounting plate 702 under the action of external force, and the connecting strip 504 drives the cotton brush 7 to move together under the action of external force, so that the cotton brush 7 and the cotton sliver 703 move together along the direction that the lower die 3 is far away from the frame 1 after the shovel push plate 503 under the action of external force, and further the cotton brush 7 brushes down the residual materials adhered to the lower die 3 in the moving process, and the cotton sliver 703 is utilized to push the brushed residual materials to move towards the direction close to the roller 603.
The protective part includes:
a movable opening 704 which is arranged on one side of the lower die 3 away from the shovel push plate 503 and is communicated with the slot 303;
a support plate 705 fixed on one side of the lower mold 3 away from the shovel plate 503 and located at a direction where the movable port 704 is close to the frame 1;
a third spring 706 fixed to one surface of the support plate 705 near the movable port 704;
a dome plate 707 fixed to an end of the third spring 706 remote from the support plate 705;
A baffle 708 is fixed to the end of the arch 707 near the lower mold 3, and is located inside the slot 303 and flush with the side of the lower mold 3 away from the frame 1.
Specifically, the movable opening 704 can provide a movable placing space for the baffle 708, the support plate 705 can stably support the third spring 706 under the support of the lower die 3, the third spring 706 has a certain elasticity, can be stretched and deformed under the action of external force, can rebound after the external force disappears, and can support the arch 707, so that the arch 707 is supported by the baffle 708, and further, when the baffle 708 is in a natural state of the third spring 706, the opening of the slot 303 is blocked under the support of the arch 707, and the movable support is provided for the residue pushed by the cotton sliver 703.
The collecting member includes:
A positioning cover 709 fixed on one side of the lower mold 3 away from the shovel plate 503 and positioned outside the movable port 704 and the support plate 705;
a plurality of rolling bars 710, wherein the rolling bars 710 are rotatably connected to the inner side of the positioning cover 709;
A storage box 711 movably disposed at the inner side of the positioning cover 709 and located at a direction in which the rolling bar 710 is away from the frame 1;
The switch 512 is embedded in one surface of the positioning cover 709 far away from the lower die 3 and is positioned in the direction of the bracket 6 approaching the L plate 602
A pull ring 712 is secured to the end of the reservoir 711 adjacent the L-plate 602.
In the practical application process, the positioning cover 709 can provide a rotation support for the rolling rod 710, and can provide a rotation space for the rolling rod 710, the rolling rod 710 can rotate under the action of external force, when the residual material is pushed out of the lower die 3 under the support of the baffle plate 708 by the cotton sliver 703, the shovel push plate 503 contacts with the support of the positioning cover 709 under the action of external force and presses the switch 512, so that the switch 512 is triggered to turn off the power of the electromagnet 511, the magnetic force of the electromagnet 511 is eliminated, and thus the electromagnet is separated from the iron sheet 608, the pulling force on the electromagnet 511 is relieved, then the stretched second spring 502 can rebound under the support of the U frame 5 by utilizing the rebound force, and the shovel push plate 503, the cotton sliver 7 and the cotton sliver 703 are pulled to move to the direction close to the U frame 5 by the fixed plate 506, the longitudinal rod 505, the connecting strip 504, the fixed plate 701 and the mounting plate 702, so that the shovel push plate 503, the cotton sliver 7 and the cotton sliver 703 are moved into the supporting and placed in the supporting plate 501, and are reset, and meanwhile the rocker 508 can rotate under the gravity of the iron bar 509 to the direction away from the electromagnet 511 by taking the center of the iron sheet 507, so that the electromagnet is separated from the iron sheet 511.
The residue pushed out of the lower mold 3 passes through the positioning cover 709 and falls to the inner side of the storage box 711 to be collected under the action of gravity, a worker can pull the pull ring 712 according to the actual situation, so that the pull ring 712 pulls the storage box 711 along the positioning cover 709 under the action of external force, and meanwhile, the storage box 711 can rotate by utilizing the friction force to pull the rolling rod 710 under the action of external force, so that the storage box 711 can move more smoothly, and the worker can conveniently pull the storage box 711 out from the positioning cover 709 to the direction close to the L plate 602, and the storage box 711 is moved by the pull ring 712 to dump the residue collected on the inner side of the storage box 711.
The previous description of the embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The preparation method of the PET protective film for the polaroid is characterized by comprising the following steps of:
step1, printing a coating (20) with patterns on one surface of a preformed PET layer (10) to obtain a printed PET layer;
Step 2, preparing low-viscosity glue, coating the low-viscosity glue on the printed PET layer subjected to corona treatment to form a low-viscosity glue layer (30), aligning the printed PET layer coated with the low-viscosity glue with an additional layer film (40), bonding the printed PET layer and the additional layer film together through the low-viscosity glue to obtain a composite layer, and pre-drying the composite layer in an oven at 70 ℃ to preliminarily solidify the low-viscosity glue layer;
step 3, starting a hot-press forming machine, placing the pre-dried composite layer between an upper die and a lower die of the hot-press forming machine, and tightly combining the printed PET layer with the additional layer film through the action of the hot-press forming machine to obtain a composite protective film;
Step 4, taking out the composite protective film from the hot press forming machine, and performing post-curing treatment in a constant temperature and constant humidity environment for 2-4 hours;
and 5, performing quality inspection on the composite protective film after post-curing treatment, and removing unqualified products to obtain a PET protective film finished product.
2. The method for preparing a PET protective film for a polarizer according to claim 1, wherein the coating is formed by mixing acrylic resin, pigment and diluent according to a mass ratio of 5:3:2.
3. The method for preparing a PET protective film for a polarizer according to claim 2, wherein the low adhesive consists of the following formula:
60-80 parts of ethyl acrylate, 20-40 parts of butyl acrylate, 5-15 parts of acrylic acid, 1-5 parts of cross-linking agent, 0.1-1 part of emulsifying agent, 40-60 parts of deionized water, 5-15 parts of tackifier, 1-3 parts of stabilizing agent, 2-6 parts of thixotropic agent, 0.5-2 parts of accelerator, 10-30 parts of filler and 1-5 parts of anti-aging agent.
4. The method of producing a PET protective film for a polarizer according to claim 3, wherein the crosslinking agent is N-methylolacrylamide.
5. The method of producing a PET protective film for a polarizer according to claim 4, wherein the hot press molding is performed at a temperature of 90 to 100℃under a pressure of 60 to 80kg/cm2 for a time of 60 to 100 seconds.
6. The method of claim 5, wherein the tackifier is rosin resin, the stabilizer is an antioxidant, the thixotropic agent is fumed silica or organic bentonite, the promoter is a metal salt compound, and the filler is nano calcium carbonate or talcum powder.
7. The method of claim 6, wherein the metal salt compound is disodium edetate.
8. The method of producing a PET protective film for a polarizer according to claim 7, wherein the pigment is iron oxide.
9. The method of producing a PET protective film for a polarizer according to claim 8, wherein the pigment is iron oxide and the diluent is methyl ethyl ketone.
10. A PET protective film for a polarizer, characterized by being produced by the production method according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410557007.7A CN118322623A (en) | 2024-05-07 | 2024-05-07 | PET protective film for polaroid and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410557007.7A CN118322623A (en) | 2024-05-07 | 2024-05-07 | PET protective film for polaroid and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118322623A true CN118322623A (en) | 2024-07-12 |
Family
ID=91764381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410557007.7A Pending CN118322623A (en) | 2024-05-07 | 2024-05-07 | PET protective film for polaroid and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118322623A (en) |
-
2024
- 2024-05-07 CN CN202410557007.7A patent/CN118322623A/en active Pending
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