CN118698837A - High-definition biaxially oriented polyester film and coating process thereof - Google Patents
High-definition biaxially oriented polyester film and coating process thereof Download PDFInfo
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- 238000000576 coating method Methods 0.000 title claims abstract description 274
- 229920006267 polyester film Polymers 0.000 title claims abstract description 55
- 239000011248 coating agent Substances 0.000 claims abstract description 252
- 239000007788 liquid Substances 0.000 claims abstract description 194
- 238000001035 drying Methods 0.000 claims abstract description 32
- 238000002360 preparation method Methods 0.000 claims abstract description 30
- 239000002994 raw material Substances 0.000 claims abstract description 30
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 25
- 238000007756 gravure coating Methods 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 238000009998 heat setting Methods 0.000 claims abstract description 11
- 238000003851 corona treatment Methods 0.000 claims abstract description 9
- 239000004793 Polystyrene Substances 0.000 claims abstract description 6
- 238000005266 casting Methods 0.000 claims abstract description 5
- 238000002844 melting Methods 0.000 claims abstract description 5
- 230000008018 melting Effects 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 38
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 38
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 38
- 230000008569 process Effects 0.000 claims description 22
- 238000012545 processing Methods 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000010992 reflux Methods 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 7
- -1 polyethylene terephthalate Polymers 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 4
- 229920001634 Copolyester Polymers 0.000 claims description 3
- 229920001707 polybutylene terephthalate Polymers 0.000 claims description 3
- 229920000193 polymethacrylate Polymers 0.000 claims description 3
- 229920005553 polystyrene-acrylate Polymers 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims description 3
- 230000000171 quenching effect Effects 0.000 claims description 3
- 229920002223 polystyrene Polymers 0.000 abstract description 3
- 238000009501 film coating Methods 0.000 abstract 1
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- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
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- 239000003795 chemical substances by application Substances 0.000 description 3
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- 238000002834 transmittance Methods 0.000 description 3
- 239000005995 Aluminium silicate Substances 0.000 description 2
- 239000004594 Masterbatch (MB) Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
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- 230000001070 adhesive effect Effects 0.000 description 2
- 235000012211 aluminium silicate Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
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- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
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- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
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- 230000002457 bidirectional effect Effects 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
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- 239000012792 core layer Substances 0.000 description 1
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- 239000003431 cross linking reagent Substances 0.000 description 1
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- 230000005484 gravity Effects 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 238000007759 kiss coating Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000000643 oven drying Methods 0.000 description 1
- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Coating Of Shaped Articles Made Of Macromolecular Substances (AREA)
Abstract
The invention discloses a high-definition biaxially oriented polyester film and a coating process thereof, wherein the polyester film is composed of PET raw materials and organic aids; the high-definition biaxially oriented polyester film PET raw material is prepared by drying, melting, casting, longitudinal stretching, cooling, transverse stretching, heat setting and cooling; the crystallinity of the PET raw material is less than 2%; the organic auxiliary agent is crosslinked polystyrene, and the dosage is 1-5% of PET raw material. The coating process of the high-definition biaxially oriented polyester film comprises the following steps: preparation of coating liquid, supply of coating liquid, corona treatment of film and gravure coating. The invention selects PET raw materials with low crystallinity, and BOPET transparency is increased.
Description
Technical Field
The invention relates to a general process for coating fluid on the surface, in particular to a high-definition biaxially oriented polyester film and a coating process thereof.
Background
The high-definition biaxially oriented polyester film is mainly used for protecting electronic products, building environment-friendly energy-saving window films, automobile glass film-sticking masks, release protection films and films for LCD backlight source groups. Patent publication number CN1579742 a: a high-transparency multilayer co-extrusion biaxially oriented polyester film and a production method thereof are provided, wherein the biaxially oriented polyester film comprises two surface layer A layers and two surface layer C layers, and a middle layer B layer, wherein the surface layer A and the surface layer C layer contain an anti-blocking agent, and the middle layer B can be recycled for slicing. The invention also discloses a production method of the biaxially oriented polyester film, which comprises the steps of preparing a polyester raw material, extruding, casting a sheet, stretching, heat setting, relaxing, drawing, rolling and the like. The definition of the biaxially oriented polyester film is improved by selecting the additive. Patent publication number CN 103612405B: adding 0.1-0.3% of curing agent into 0.2-0.9% of pure water or ionized water according to mass percent, stirring uniformly, adding 2.4-12.5% of adhesive, 0.4-3.8% of silica sol, 0.02-0.1% of surfactant and 0.5-2.0% of organic solvent, stirring uniformly, adding the rest of pure water or ionized water to prepare aqueous coating liquid with the viscosity lower than 10cps and the solid content of 3-12% for standby, sending the core layer polyester slice and the surface layer mixed material into a main extruder and an auxiliary extruder to melt and extrude a cast slice with a three-layer structure, heating and longitudinally stretching to form a membrane, uniformly coating the aqueous coating liquid on the membrane, transversely stretching, heat setting and drying to solidify the coated membrane, dragging and rolling to prepare the polyester film … …, and often adding inorganic or organic filler into the film to increase the film to prevent the phenomenon between the film and the film in the process of producing scratch during the bidirectional stretching polyester film. The method has the advantages that the optical performance of the film is affected to a certain extent due to the difference of refractive indexes of the filler and the polyester material, and the haze of the product is generally higher. The disclosed optical polyester film and the preparation method thereof are beneficial to avoiding scratch possibly caused by contact between a substrate and a longitudinal drawing roller before coating, but compared with the method, the method has great influence on the optical performance of the film by adding the filler on the surface layer of the three-layer co-extrusion substrate. In order to improve the optical performance of the polyester film, a person chooses not to use a filler, which inevitably causes scratches at a longitudinal pulling position before coating, the apparent … … surface layer of a finished product is affected by mixing 90-97% of polyester chips with 3-10% of polyester master batch by mass percent, and the polyester master batch contains 0.3% of inorganic filler or organic filler. The method reduces the manufacturing cost of the film and simultaneously reduces the influence of the filler added into the base material on the optical performance of the film by adding a small amount of filler into the surface layer. Has high light transmittance and low haze. However, the effect of improving the definition by changing the additive is common, and the technical means of improving the path by other techniques to improve the definition in the prior art is not seen.
The high-definition biaxially oriented polyester film may be coated with PVDC to improve heat sealability, barrier properties and adhesion for printing. The coating liquid prepared by coating is generally aqueous, and the basic components are water, a leveling agent (which enables the coating liquid to be uniformly dispersed), a functional coating liquid (which provides the main function of the coating liquid), a curing agent (also called a cross-linking agent, which is used for cross-linking reaction with resin in a drying process to enable the resin to be firmly combined with the surface of the film) and a catalyst. Coating is compared with other surface treatment modes as follows: the coating is carried out between longitudinal stretching and transverse stretching without off-line rewinding, and the transverse stretching section is used as an oven drying coating liquid, so that the production efficiency is high; and the coating is thinner than off-line coating due to uniform coating, and the coating effect is better, so that the coating cost can be obviously reduced. The surface tension of the film subjected to corona treatment gradually decays with time, and the surface of the film subjected to coating treatment does not have the problem of corona decay. The coating process flow is generally as follows: after the polyester film is longitudinally stretched by a longitudinal stretching device, corona treatment is carried out on the surface of the film by a corona device so as to improve the surface tension of the film and enhance the wettability. And meanwhile, the intermediate pump pumps the coating liquid in the intermediate tank into a sealed scraper cavity, the concave roller transfers the coating liquid in the cavity to the surface of the film through a contact wrap angle with the film, and a coating layer is formed on the surface of the film. The film covered with the coating liquid then enters a transverse stretching device, and in a transverse stretching preheating section, the coating liquid volatilizes water in a drying process, and finally a uniform chemical treatment layer is formed on the surface of the film. The prior art is as mentioned in Zhao Fu paper "on-line coating technology of superficial polyester film" published in China packaging industry 2013: the polyester film online coating equipment generally comprises a coating liquid feeding device, a corona device, a kiss-coating guide roller, a coating scraper cavity, a coating concave roller, a coating rubber press roller, an S-shaped guide roller and the like, wherein the doctor cavity is … … 2.3.3. The doctor blade cavity consists of a cavity and a coating doctor blade. The doctor blade cavity is closely contacted with the coating concave roller in a working state, coating liquid is transferred to the coating concave roller, the coating doctor blade is used for removing redundant coating liquid on the coating roller, so that the coating liquid is uniformly distributed on the coating roller, the replaceable coating doctor blade is usually made of a stainless steel material, the … … concave roller transfers the coating liquid in the cavity to the surface of the film through a contact wrap angle with the film, and a coating layer is formed on the surface of the film. As another example, in the paper "analysis of factors affecting the production stability of an online coated film in the production of a polyester film" published in plastic packaging "2009, volume 19, phase 4, prior art Wu Jianping, mention: the coating head consists of a coating liquid feeding area, a coating knife and a coating knife rest. The coating liquid feeding area is used for transferring the coating liquid onto the coating wheel, the coating knife is used for removing redundant coating liquid on the coating roller, so that the coating liquid is uniformly distributed on the coating roller, the coating knife is usually made of materials such as steel or plastics, and the coating knife rest is used for fixing the coating knife. As can be seen from the drawing, the doctor blade chamber is the coating liquid supply area (i.e., the part denoted by reference numeral 4 in fig. 2), and it is found by both of these prior arts that the doctor blade chamber is in close contact with the coating roll (or coating gravure roll), and the doctor blade chamber is either vertically or obliquely disposed, but both require the back flow treatment of the coating liquid (i.e., a back flow device is required, and it can be referred to the development overview and the hope of the paper on-line coating functional polyester film published by the polyester industry 2023-01, volume 36, 1, by Li Mingyong, that the on-line coating main device is composed of a coating liquid supply device, a corona device, a coating head, an S-type lead-out roll, and the like. the coating liquid supply device is used for conveying the prepared coating liquid to the coating head and is provided with a reflux device, and the whole liquid supply system is a circulating system, so that the online coating process flow is complex, the treatment procedures are more, the online coating processing equipment is complex, the occupied area is more, and the installation is troublesome.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a coating processing technology of a high-definition biaxially oriented polyester film, wherein a PET raw material with lower crystallinity is selected, and the haze of a BOPET film (namely the biaxially oriented polyester film) is reduced, so that the transparency of the BOPET is increased, and the definition is improved; organic auxiliary agents are selected in the formula, and inorganic auxiliary agents are not used, so that the influence on the transparency of the product is relatively small because the refractive index of the organic auxiliary agents is similar to that of the PET resin and the compatibility of the organic auxiliary agents and the PET resin is good.
In order to achieve the aim, the technical scheme of the invention is to design a coating processing technology of a high-definition biaxially oriented polyester film, which consists of PET raw materials and organic aids; the PET raw material is selected from one or more of polyethylene terephthalate, polybutylene terephthalate and copolyester thereof; the high-definition biaxially oriented polyester film PET raw material is prepared by drying, melting, casting, longitudinal stretching, cooling, transverse stretching, heat setting and cooling; the crystallinity of the PET raw material is less than 2%; the organic auxiliary agent is crosslinked polystyrene or polymethacrylate, and the dosage is 1-5% of PET raw material. The haze of the BOPET film is increased when the crystallinity of PET is improved, namely the transparency of the BOPET is reduced; therefore, on the premise of ensuring the quality of the film, the scheme selects PET raw materials with lower crystallinity; the common auxiliary agents of BOPET film are inorganic particles such as silicon dioxide, calcium carbonate, aluminum oxide, kaolin and the like and organic particles such as crosslinked polystyrene and the like. Since the refractive index of the organic auxiliary agent is similar to that of the PET resin and the compatibility of the organic auxiliary agent and the PET resin is good, the influence on the transparency of the product is relatively small. Therefore, the scheme selects organic auxiliary agents in the formula and does not use inorganic auxiliary agents. As the content of the auxiliary agent increases, the scattered light increases, and the haze of the film increases; therefore, when the BOPET film is produced, the formulation is reasonable, and the auxiliary agent is excessively added as much as possible; the content of the auxiliary agent in the scheme is less.
The further technical proposal is that the water content of the PET raw material before drying is 0.4 percent, and the water content after drying is less than 20mg/kg; drying PET raw materials by adopting an air flow drying method, wherein the fluid adopts heated air with the dew point temperature lower than-40 ℃; the drying time was 4h. The water content of the PET resin decreases with increasing drying temperature; the water content is not reduced after the drying time reaches a certain value, so the application reasonably controls the drying time. The moisture content of the heated air is an important factor in the rate of evaporation of water in the slices during the pneumatic drying process. The lower the moisture content of the heated air, the greater the difference from the moisture content of the slices, the more easily the moisture in the slices evaporates and is carried away by the air. Therefore, the scheme selects the heated air with the dew point temperature lower than-40 ℃ and has good air flow drying effect.
In the preheating step in the longitudinal stretching step, the preheating temperature is about 80+/-2 ℃; the temperature of the stretching process is less than 90 ℃; a draw ratio of less than 3.17; quenching at a temperature of less than 35 ℃ after longitudinal stretching;
The transverse stretching process comprises four processes of preheating, stretching, heat treatment and cooling; the preheating temperature is 82-90 ℃; the stretching temperature is 95-110 ℃; a draw ratio of less than 4; the heat setting temperature is 220-230 ℃. The sheet needs to be preheated before being stretched until the temperature of a preheating roller in a longitudinal stretching preheating zone is gradually increased, and in order to ensure that the sheet is uniform in internal and external temperature distribution in a short time, an infrared heater can be used for further heating, so that the preheating temperature is controlled to be about 82 ℃; the film after longitudinal stretching is quenched at a temperature of less than 35 ℃ to reduce the crystallization rate and create good processing conditions for transverse stretching. The heat setting temperature of the transverse stretching is 220-230 ℃, the crystallization temperature of 190 ℃ is avoided when the maximum crystallization speed is avoided, and the PET is known in the art to be a crystallization material, the light transmittance of the crystallization material is closely related to the crystallinity, the crystallinity has high light transmittance difference, and the influence of the crystallinity in production is closely related to the cooling speed of the melting material.
The invention also provides a coating process of the high-definition biaxially oriented polyester film, which is used for coating the high-definition biaxially oriented polyester film and comprises the following process steps in sequence:
preparing a coating liquid, supplying the coating liquid, carrying out film corona treatment and carrying out gravure coating; wherein, the concave roller coating procedure is also provided with overflow reflux treatment of the coating liquid.
The invention also provides a coating process of the high-definition biaxially oriented polyester film, which is used for coating the high-definition biaxially oriented polyester film and comprises the following process steps in sequence:
preparing a coating liquid, supplying the coating liquid, carrying out film corona treatment and carrying out gravure coating;
In the gravure coating process, more coating liquid is loaded on the gravure, and the surplus coating liquid falls back to the gravure coating station instead of flowing back to the coating liquid preparation station. According to the scheme, a reflux treatment process is omitted, and the surplus coating liquid falls back to the gravure coating station, so that a reflux device is not needed, the reflux treatment is omitted, the online coating process flow is simplified, the treatment process is reduced, online coating processing equipment is simplified, the equipment occupation is reduced, and the equipment parts are reduced so that the installation is easier.
The invention also provides a technical scheme that the coating processing equipment of the high-definition biaxially oriented polyester film is used in a coating process of the high-definition biaxially oriented polyester film and comprises a corona device, a scraper cavity, a coating concave roller and a coating liquid preparation device which are sequentially arranged; the coating liquid preparation device consists of a liquid preparation tank, a liquid supply pump and a middle tank; the liquid preparation tank and the liquid supply pump are connected with the intermediate tank through a liquid supply pipe;
The rotation direction of the coating roller is opposite to the advancing direction of the film; the surface of the groove on the surface of the coating concave roller, which is far away from the film along the rotation direction, is higher so that the coating concave roller bears more coating liquid; a liquid level meter is arranged in the scraper cavity and is in signal connection with a controller; the controller is connected with a liquid supply pump in the coating liquid feeding device in a signal way outside the coating processing equipment. The reflow process is eliminated by improvements in doctor blade cavities, coating gravure roll, and liquid supply control. The liquid supply amount of the coating liquid feeding device can be controlled according to the signal of the liquid level meter in the scraper cavity, and the problem that the prior art adopts a mode of surplus liquid supply amount and then backflow is avoided.
The invention has the advantages and beneficial effects that: the haze of the BOPET film is increased when the crystallinity of PET is improved, namely the transparency of the BOPET is reduced; therefore, on the premise of ensuring the quality of the film, the scheme selects PET raw materials with lower crystallinity; the common auxiliary agents of BOPET film are inorganic particles such as silicon dioxide, calcium carbonate, aluminum oxide, kaolin and the like and organic particles such as crosslinked polystyrene and the like. Since the refractive index of the organic auxiliary agent is similar to that of the PET resin and the compatibility of the organic auxiliary agent and the PET resin is good, the influence on the transparency of the product is relatively small. Therefore, the scheme selects organic auxiliary agents in the formula and does not use inorganic auxiliary agents.
As the content of the auxiliary agent increases, the scattered light increases, and the haze of the film increases; therefore, when the BOPET film is produced, the formulation is reasonable, and the auxiliary agent is excessively added as much as possible; the content of the auxiliary agent in the scheme is less.
The water content of the PET resin decreases with increasing drying temperature; the water content is not reduced after the drying time reaches a certain value, so the application reasonably controls the drying time. The moisture content of the heated air is an important factor in the rate of evaporation of water in the slices during the pneumatic drying process. The lower the moisture content of the heated air, the greater the difference from the moisture content of the slices, the more easily the moisture in the slices evaporates and is carried away by the air. Therefore, the scheme selects the heated air with the dew point temperature lower than-40 ℃ and has good air flow drying effect.
The sheet needs to be preheated before being stretched until the temperature of a preheating roller in a longitudinal stretching preheating zone is gradually increased, and in order to ensure that the sheet is uniform in internal and external temperature distribution in a short time, an infrared heater can be used for further heating, so that the preheating temperature is controlled to be about 82 ℃; the film after longitudinal stretching is quenched at a temperature of less than 35 ℃ to reduce the crystallization rate and create good processing conditions for transverse stretching.
The heat setting temperature of transverse stretching is 220-230 ℃, and the crystallization temperature at the maximum crystallization speed is avoided by 190 ℃.
According to the scheme, a reflux treatment process is omitted, and the surplus coating liquid falls back to the gravure coating station, so that a reflux device is not needed, the reflux treatment is omitted, the online coating process flow is simplified, the treatment process is reduced, online coating processing equipment is simplified, the equipment occupation is reduced, and the equipment parts are reduced so that the installation is easier.
The reflow process is eliminated by improvements in doctor blade cavities, coating gravure roll, and liquid supply control. The liquid supply amount of the coating liquid feeding device can be controlled according to the signal of the liquid level meter in the scraper cavity, and the problem that the prior art adopts a mode of surplus liquid supply amount and then backflow is avoided.
Drawings
FIG. 1 is a schematic diagram of a coating processing apparatus for a high definition biaxially oriented polyester film according to a second embodiment of the present invention;
FIG. 2 is an enlarged schematic view of the doctor blade chamber, applicator gravure roll, and applicator roll sections of FIG. 1;
FIG. 3 is an enlarged schematic view of portion A of FIG. 2;
FIG. 4 is an enlarged schematic view of a doctor blade chamber and a gravure roll segment in accordance with a third embodiment of the present invention;
FIG. 5 is an enlarged schematic view of portion B of FIG. 4;
FIG. 6 is a side view of portion B of FIG. 4;
FIG. 7 is an enlarged schematic view of portion C of FIG. 6;
FIG. 8 is a perspective view of one of the grooves and the fluted plate of FIG. 6;
FIG. 9 is an exploded view of FIG. 8;
FIG. 10 is a schematic diagram of a fourth embodiment of the invention;
Fig. 11 is an enlarged schematic view of the coating pitch roller, the coating film take-out roller and the parts in the vicinity thereof in fig. 10.
In the figure: 1. a corona device; 2. a doctor blade cavity; 3. coating a gravure roll; 4. coating a press roller; 5. a liquid preparation tank; 6. a liquid supply pump; 7. an intermediate tank; 8. a film; 9. a groove; 10. a liquid level gauge; 11. a controller; 12. a trough plate; 13. a spring; 14. coating a spacing roller; 15. a coating film delivery roller; 16. a steering roller; 17. a proportional valve; 18. an infrared heater.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings and examples. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
Embodiment one: the invention relates to a coating processing technology of a high-definition biaxially oriented polyester film, which consists of PET raw materials and organic auxiliary agents; the PET raw material is selected from one or more of polyethylene terephthalate, polybutylene terephthalate and copolyester thereof; the high-definition biaxially oriented polyester film PET raw material is prepared by drying, melting, casting, longitudinal stretching, cooling, transverse stretching, heat setting and cooling; the crystallinity of the PET raw material is less than 2%; the organic auxiliary agent is crosslinked polystyrene or polymethacrylate, and the dosage is 1-5% of PET raw material. The water content of the PET raw material before drying is 0.4%, and the water content after drying is less than 20mg/kg; drying PET raw materials by adopting an air flow drying method, wherein the fluid adopts heated air with the dew point temperature lower than-40 ℃; the drying time was 4h. In the preheating step in the longitudinal stretching step, the preheating temperature is about 80+/-2 ℃; the temperature of the stretching process is less than 90 ℃; a draw ratio of less than 3.17; quenching at a temperature of less than 35 ℃ after longitudinal stretching; the transverse stretching process comprises four processes of preheating, stretching, heat treatment and cooling; the preheating temperature is 82-90 ℃; the stretching temperature is 95-110 ℃; a draw ratio of less than 4; the heat setting temperature is 220-230 ℃.
The coating process of the high-definition biaxially oriented polyester film is used for coating the high-definition biaxially oriented polyester film and comprises the following process steps of:
preparing a coating liquid, supplying the coating liquid, carrying out film corona treatment and carrying out gravure coating; wherein, the concave roller coating procedure is also provided with overflow reflux treatment of the coating liquid.
Embodiment two: the difference from the first embodiment is that, as shown in fig. 1 to 3, the coating process of the high-definition biaxially oriented polyester film is used for coating the high-definition biaxially oriented polyester film, and is composed of the following process steps sequentially performed:
preparing a coating liquid, supplying the coating liquid, carrying out film corona treatment and carrying out gravure coating;
in the gravure coating process, more coating liquid is loaded on the gravure, and the surplus coating liquid falls back to the gravure coating station instead of flowing back to the coating liquid preparation station.
The coating processing equipment of the high-definition biaxially oriented polyester film is used in the coating process of the high-definition biaxially oriented polyester film, and consists of a corona device 1, a scraper cavity 2, a coating concave roller 3 and a coating liquid preparation device which are sequentially arranged (of course, the opposite side of the coating concave roller 3, namely the other side of the film 8, is provided with a coating press roller 4); the coating liquid preparation device consists of a liquid preparation tank 5, a liquid supply pump 6 and an intermediate tank 7; the liquid preparation tank 5 and the liquid supply pump 6 are connected with the intermediate tank 7 through a liquid supply pipe; the liquid supply pump 6 inputs the coating liquid in the liquid preparation tank 5 into the intermediate tank 7 through a liquid supply pipe, and the intermediate tank 7 inputs the coating liquid into the scraper cavity 2 through a pipeline (the pipeline can be provided with a liquid supply pump); the direction of rotation of the coating gravure roll 3 is opposite to the direction of advance of the film 8; the side of the groove 9 of the surface of the coating gravure roll 3, which is farther from the film 8 in the direction of rotation, is higher so that the coating gravure roll 3 carries more coating liquid; a liquid level meter 10 is arranged in the scraper cavity 2, and the liquid level meter 10 is in signal connection with a controller 11; the controller 11 is connected with a liquid supply pump 6 in the coating liquid feeding device in a signal way outside the coating processing equipment. The bottom wall of the scraper cavity is obliquely arranged with the horizontal plane; the doctor blade cavity is larger in size than the conventional doctor blade cavity; the scraper cavity is obliquely arranged with the horizontal plane (or the vertical plane), and the direction from the lower end to the upper end of the scraper cavity is along the advancing (or conveying) direction of the film (so that the grooves on the coating roller can be ensured to bear more coating liquid without leakage).
The liquid supply amount of the coating liquid feeding device can be controlled according to the signal of the liquid level meter in the scraper cavity, and the problem that the prior art adopts a mode of surplus liquid supply amount and then backflow is avoided. According to the mode of guaranteeing coating amount (such as adhesive consumption in a glue storage barrel, in the online coating field of biaxially oriented polyester film, namely the consumption of coating liquid in a scraper cavity), when the coating liquid in the scraper cavity exceeds a set value (indicating that surplus coating liquid on a coating concave roller flows into the scraper cavity or excessive coating liquid is pumped in by a liquid supply pump), a signal is received by a liquid level meter, a controller controls the liquid supply pump to reduce the liquid supply amount until the liquid level of the coating liquid in the scraper cavity returns to a preset set value, and the problem that the coating liquid overflows due to the matching of the scraper cavity which is enlarged in size and is obliquely arranged is solved, and meanwhile, the problems that reflux treatment and reflux devices are needed in the prior art are solved.
The doctor blade cavity is still inclined, but the size is larger, and based on the basic principle that the running direction of the coating roller needs to be set opposite to the advancing direction of the film so as to achieve the purpose of transferring the coating liquid, one surface of a groove (the coating roller is a metal roller with tiny grooves on the surface) of the coating concave roller is set higher so as to bear more coating liquid; the scraper cavity with enlarged size is provided with a liquid level meter which is connected with a controller through signals; the controller is positioned outside the online coating processing equipment and is in signal connection with the coating liquid feeding device; therefore, no reflux treatment is needed, the coating liquid with more coating concave rollers is brought back into the scraper cavity after the size is enlarged, the liquid supply amount of the coating liquid feeding device can be controlled only according to the signal of the liquid level meter in the scraper cavity, the mode that the surplus liquid supply amount is adopted and then the coating liquid flows back in the prior art is avoided, the online coating process flow is simplified, the treatment procedure is reduced, online coating processing equipment is simplified, the equipment occupation is reduced, and the equipment parts are reduced so that the installation is easier. After the arrangement, the improvement of the scraper cavity, the coating concave roller and the liquid supply amount control is removed, and the reflux treatment is eliminated.
The prior art adopts the overflow or surplus coating liquid mode to ensure the film to be coated completely on line (or avoid coating to have the film part surface missing coating liquid), then adopts the surplus coating liquid backflow mode, and still provides the surplus coating liquid (the carried coating liquid is increased because one side of the groove is higher) through the groove mode of heightening the surface of the coating concave roller, so the film on line coating is ensured completely (or avoid coating to have the film part surface missing coating liquid), and the backflow treatment is eliminated through the improvement of the scraper cavity, the coating concave roller and the liquid supply quantity control.
Embodiment III: the difference from the second embodiment is that, as shown in fig. 4 to 9, the side of the groove 9 on the surface of the coating gravure roll 3, which is far away from the film along the rotation direction, is higher than the side of the original groove with equal groove depth, namely, a blind hole-shaped groove is additionally arranged on the top wall of the groove 9, a groove plate 12 (generally, the groove plate 12 is rectangular and annular in shape, so that the groove plate 12 is semi-rectangular and annular), the thickness of the groove plate 12 is smaller than the thickness of the groove wall of the groove 9, the bottom wall of the groove plate is fixedly connected with a spring 13 (when the groove plate is not stressed, namely, the spring only bears the gravity of the groove plate, the upper end surface of the groove plate exceeds the groove top wall of the groove), and a sliding sealing piece is arranged at the groove position, so that the tightness is ensured (because the true multi-bearing coating liquid can be ensured, and the multi-bearing coating liquid in the process of sliding the groove plate is prevented from flowing out from the groove plate and the groove position).
After the arrangement, when the coating concave roller 3 rotates (the running direction of the coating concave roller is opposite to the advancing direction of the film), the groove 9 on the coating concave roller firstly bears the coating liquid in the scraper cavity 2, and as the groove on the coating concave roller firstly contacts the scraper cavity 2, the groove 9 firstly contacts the scraper cavity is not stressed (is not stressed by the pressure of the film), so that the groove plate 12 exceeds the groove top wall of the groove and is matched with the sliding sealing piece, compared with the groove in the prior art, more coating liquid can be borne (so that overflow in the prior art, namely surplus liquid supply amount is still adopted to ensure enough way of coating of the film surface), and when the groove 9 on the coating concave roller 3 rotates and contacts the polyester film, the groove plate 12 on the groove is retracted due to compression (not only the pressure of the film but also the pressure of the coating pressing roller) (namely, the groove plate is retracted into the groove, the spring 13 is compressed), one part of the multi-bearing coating liquid flows to the film surface, and the other part flows back to the scraper cavity due to the expansion of the size of the scraper cavity 2; in order to ensure that a reflux device is not needed and reflux treatment is omitted, the scraper cavity 2 can be arranged in a semi-annular shape (in this way, the whole coating concave roller can be held by a pocket, and the coating liquid is effectively prevented from flowing out from the other side of the coating concave roller and falling on the ground of a workshop where the coating equipment is located after separating from the coating concave roller).
Embodiment four: the difference from the second embodiment is that, as shown in fig. 10 and 11, the coating processing equipment for the high-definition biaxially oriented polyester film is used in the coating process of the high-definition biaxially oriented polyester film, and is composed of a corona device 1, a coating liquid preparation device, two coating interval rollers 14 and a coating film guiding roller 15 which are sequentially arranged (the film 8 is positioned below the coating interval rollers 14 and the coating film guiding roller 15); the distance between the two coating-interval rollers 14 and the film 8 becomes gradually smaller in the film advancing direction; the coating liquid preparation device consists of a liquid preparation tank 5, a liquid supply pump 6 and an intermediate tank 7; the liquid preparation tank 5 and the liquid supply pump 6 are connected with the intermediate tank 7 through a liquid supply pipe; the liquid supply pump 6 inputs the coating liquid in the liquid preparation tank 5 into the intermediate tank 7 through a liquid supply pipe, and the intermediate tank 7 inputs the coating liquid onto the film 8 positioned between the steering roller 16 and the coating film guiding-out roller 15 through a pipeline (the liquid supply pump can be arranged on the pipeline); the liquid supply pipe is provided with a proportional valve 17, the proportional valve 17 is in signal connection with a controller 11 of coating processing equipment of the high-definition biaxially oriented polyester film, and the controller 11 is also in signal connection with a liquid supply pump 6; an infrared heater 18 is arranged between two coating interval rollers 14 which are arranged in sequence; an infrared heater 18 is also provided between the coating film take-off roller 15 and the underlying (i.e., lower) coating distance roller 14.
After the arrangement, the required output quantity of the coating liquid can be calculated according to the inclination angle of the film 8 between the turning roll 16 and the coating film guiding-out roll 15 and the conveying speed of the film, the controller controls the opening of the liquid supply pump 6 and the opening of the proportional valve 17, so that the problem of too much liquid supply of the coating liquid can be avoided, the arrangement of the coating interval roll 14 gradually approaching to the film 8 ensures the thickness of the coating liquid coated on the surface of the film 8, and an infrared heater 18 is arranged between the two coating interval rolls 14 which are sequentially arranged; the arrangement of the infrared heater 18 between the coating film take-out roller 15 and the coating pitch roller 14 located below (i.e., lower) can eliminate the preheating process in the transverse drawing process; the thickness of the coating liquid can be ensured to be stable by combining infrared heating during coating. After the arrangement, the original preparation process is changed, compared with the mode of coating the coating liquid from the lower surface of the film 8, the cleaning of the workshop floor can be better kept, the waste of the coating liquid is avoided, the coating liquid is obliquely arranged in cooperation with the film, the coating liquid is firstly input at the upper end of the oblique film, so that the liquid supply amount of the coating liquid can be slightly more than calculated, the thickness of the coating liquid can be ensured through the cooperation of the subsequent coating interval roller 14 and the infrared heater 18, the situation that part of the film surface lacks the coating liquid is avoided, and the overflow condition caused by too much liquid supply amount can be avoided.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (5)
1. The coating process of the high-definition biaxially oriented polyester film is characterized by comprising the following process steps of:
preparing a coating liquid, supplying the coating liquid, carrying out film corona treatment and carrying out gravure coating; wherein, overflow reflux treatment of the coating liquid is also arranged in the gravure coating procedure;
The coating equipment adopted in the coating process consists of a corona device, a scraper cavity, a coating concave roller and a coating liquid preparation device which are sequentially arranged; the coating liquid preparation device consists of a liquid preparation tank, a liquid supply pump and a middle tank; the liquid preparation tank and the liquid supply pump are connected with the intermediate tank through a liquid supply pipe;
The rotation direction of the coating roller is opposite to the advancing direction of the film; the surface of the groove on the surface of the coating concave roller, which is far away from the film along the rotation direction, is higher so that the coating concave roller bears more coating liquid; a liquid level meter is arranged in the scraper cavity and is in signal connection with a controller; the controller is connected with a liquid supply pump in the coating liquid feeding device in a signal way outside the coating processing equipment;
A blind hole-shaped slot is formed in the top wall of the groove, a slot plate which is contoured to half of the groove is slidably arranged in the slot, the thickness of the slot plate is smaller than the thickness of the slot wall of the groove, and the bottom wall of the slot plate is fixedly connected with a spring;
The coating processing equipment for the high-definition biaxially oriented polyester film in the coating process of the high-definition biaxially oriented polyester film comprises a corona device, two coating interval rollers, a coating film leading-out roller and a coating liquid preparation device which are sequentially arranged; the film is positioned below the coating interval roller and the coating film guiding-out roller; the distance between the two coating interval rollers and the film is gradually reduced along the advancing direction of the film; the coating liquid preparation device consists of a liquid preparation tank, a liquid supply pump and a middle tank; the liquid preparation tank and the liquid supply pump are connected with the intermediate tank through a liquid supply pipe; the liquid supply pump inputs the coating liquid in the liquid preparation tank into the intermediate tank through the liquid supply pipe, the intermediate tank inputs the coating liquid onto the film positioned between the steering roller and the coating film guiding-out roller through the pipeline, and the pipeline is provided with the liquid supply pump; the liquid supply pipe is provided with a proportional valve which is in signal connection with a controller of coating processing equipment of the high-definition biaxially oriented polyester film, and the controller is also in signal connection with a liquid supply pump; an infrared heater is arranged between two coating interval rollers which are sequentially arranged; an infrared heater is also provided between the coating film take-out roller and the lower coating pitch roller.
2. The coating process of the high-definition biaxially oriented polyester film is characterized by comprising the following process steps of:
preparing a coating liquid, supplying the coating liquid, carrying out film corona treatment and carrying out gravure coating;
in the gravure coating process, more coating liquid is loaded on the gravure, and the surplus coating liquid falls back to the gravure coating station instead of flowing back to the coating liquid preparation station.
3. The high-definition biaxially oriented polyester film is characterized by being coated by the coating process according to claim 1 or 2, and being composed of PET raw materials and organic aids; the PET raw material is selected from one or more of polyethylene terephthalate, polybutylene terephthalate and copolyester thereof; the high-definition biaxially oriented polyester film PET raw material is prepared by drying, melting, casting, longitudinal stretching, cooling, transverse stretching, heat setting and cooling; the crystallinity of the PET raw material is less than 2%; the organic auxiliary agent is crosslinked polystyrene or polymethacrylate, and the dosage is 1-5% of PET raw material.
4. The high-definition biaxially oriented polyester film according to claim 3, wherein the water content before drying of the PET raw material is 0.4%, and the water content after drying is less than 20mg/kg; drying PET raw materials by adopting an air flow drying method, wherein the fluid adopts heated air with the dew point temperature lower than-40 ℃; the drying time was 4h.
5. The high-definition biaxially oriented polyester film according to claim 4, wherein in the preheating step in the longitudinal stretching step, the preheating temperature is about 80.+ -. 2 ℃; the temperature of the stretching process is less than 90 ℃; a draw ratio of less than 3.17; quenching at a temperature of less than 35 ℃ after longitudinal stretching;
The transverse stretching process comprises four processes of preheating, stretching, heat treatment and cooling; the preheating temperature is 82-90 ℃; the stretching temperature is 95-110 ℃; a draw ratio of less than 4; the heat setting temperature is 220-230 ℃.
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