CN112829451A - Thin film printing device and printing method thereof - Google Patents
Thin film printing device and printing method thereof Download PDFInfo
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- CN112829451A CN112829451A CN202010476460.7A CN202010476460A CN112829451A CN 112829451 A CN112829451 A CN 112829451A CN 202010476460 A CN202010476460 A CN 202010476460A CN 112829451 A CN112829451 A CN 112829451A
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- printing
- isolation device
- vacuum isolation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F19/00—Apparatus or machines for carrying out printing operations combined with other operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
- B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
- B41F23/0486—Particular types of dryers
- B41F23/0489—Vacuum dryers
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- Drying Of Solid Materials (AREA)
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Abstract
The invention discloses a film printing device and a printing method thereof, wherein the film printing device comprises: a printing roller for printing ink on a printing surface of a film substrate; and the drying module comprises a vacuum isolation device and a plurality of heating rollers, the film substrate enters the vacuum isolation device from an inlet end, passes through the plurality of heating rollers and then penetrates out of the outer side of the vacuum isolation device from an outlet end, and an environment smaller than atmospheric pressure is formed in the vacuum isolation device, so that the film substrate is heated by the heating rollers under the condition of being lower than the atmospheric pressure to dry the printing ink.
Description
Technical Field
The present invention relates to a film printing apparatus and a printing method thereof, and more particularly, to a film printing apparatus and a printing method thereof, which print ink on a surface of a polymer film to form a film having a pattern.
Background
The existing film printing mostly adopts oil-based ink which contains volatile solvent and has the advantage of quick drying, so that in the printing process, the ink can be quickly dried after being printed on the surface of the film, and the printing speed can be increased. However, the volatile solvent in the ink can be diffused in the air, so a special gas recovery device must be provided to extract the volatile solvent, so as to avoid causing environmental and air pollution and causing harm to the body of the worker.
Therefore, nowadays, more and more printing products adopt environment-friendly ink to replace oil-based ink so as to reduce environmental pollution caused by volatile solvent in the ink. However, most of the environmental-friendly inks use water as a solvent of the ink, and the volatilization speed of water is lower than that of a volatile solvent, so that the problem that the water-based ink is not easy to dry is caused, and the problem that the printing process needs to prolong the drying time, thereby reducing the printing speed. In addition, since the environmentally friendly ink cannot be dried quickly, it is not suitable for the technical field of continuous printing of polymer material films.
Disclosure of Invention
The invention aims to solve the problem of difficulty in quick drying of water-based environment-friendly ink, and provides a film printing device and a printing method thereof, which can apply the water-based environment-friendly ink to quick and continuous printing of films.
To solve the above problems, an embodiment of the present invention provides a thin film printing apparatus, including: a printing roller for printing ink on a printing surface of a film substrate; the drying module comprises a vacuum isolation device and a plurality of heating rollers, wherein an accommodating space is formed in the vacuum isolation device and is provided with an inlet end and an outlet end, the plurality of heating rollers are accommodated in the vacuum isolation device and are contacted with one side of the film substrate opposite to the printing surface, and the film substrate enters the vacuum isolation device from the inlet end and passes through the plurality of heating rollers after passing through the printing roller and then passes out of the outer side of the vacuum isolation device from the outlet end; the air extracting device is connected with the vacuum isolating device and used for extracting the air in the accommodating space in the vacuum isolating device so as to ensure that the air pressure in the vacuum isolating device is lower than the atmospheric pressure; when the film substrate passes through the drying module, the film substrate can be heated by the plurality of heating rollers in the vacuum isolation device and in an environment lower than atmospheric pressure, so that the printing ink on the film substrate is dried.
In a preferred embodiment of the present invention, the vacuum isolation apparatus has a housing, the housing has an inlet end and an outlet end, the film substrate enters the housing from the inlet end and passes through the outlet end to the outside of the housing, and the housing is connected to an exhaust tube and connected to the exhaust apparatus through the exhaust tube.
In a preferred embodiment of the present invention, the interior of the housing is partitioned into a plurality of partitioned spaces by a plurality of partitions, and the pressure inside each of the partitioned spaces is different.
In a preferred embodiment of the present invention, the plurality of heating rollers are distributed in the plurality of partitioned spaces, and the heating temperatures of the heating rollers in each of the partitioned spaces are different from each other.
In a preferred embodiment of the present invention, among the plurality of partitioned spaces, the partitioned space closest to the inlet end has the highest internal pressure, and the partitioned space closest to the outlet end has the lowest internal pressure.
In a preferred embodiment of the present invention, a cover is disposed on one side of the housing, and the cover is detachably disposed on the housing.
The invention also provides a film printing method for printing ink on a film substrate to form a printing pattern, which comprises the following steps: implementing a feeding procedure, and continuously conveying the film substrate to be printed through a printing roller by a feeding device; implementing a printing program, wherein the printing roller is in rolling contact with the printing surface of the film substrate, and the printing ink is printed on the printing surface to form a printing pattern; and carrying out a drying procedure, wherein the drying procedure is to heat the film substrate printed with the ink under the environment of less than atmospheric pressure so as to dry the ink on the film substrate.
The invention has the beneficial effects that the ink can be quickly dried, and the water-based environment-friendly ink can be applied to the technical field of continuous and quick printing of films.
For a better understanding of the features and technical content of the present invention, reference should be made to the following detailed description of the invention and accompanying drawings, which are provided for purposes of illustration and description only and are not intended to limit the invention.
Drawings
Fig. 1 is a schematic view of a printing system using a printing apparatus of the present invention.
FIG. 2 is a schematic view of a printing apparatus of the present invention.
Fig. 3 is a schematic view of the printing apparatus of the present invention in a state where the housing is detached.
FIG. 4 is a diagram of a printing device according to a second embodiment of the present invention.
FIG. 5 is a schematic flow chart of a thin film printing method according to the present invention.
Detailed Description
Referring to fig. 1, a printing system 1 using the printing apparatus of the present invention mainly includes a feeding device 10, a plurality of printing apparatuses 20, and a receiving device 30. The film base material F to be printed is arranged on the feeding device 10, the film base material F is a polymer film (such as PP, PET and PVC films), after being sent out from the feeding device 10, the film base material F sequentially passes through the plurality of printing devices 20, water-based environment-friendly ink is printed on the printing surface of the film base material F to form a printing pattern, and then the printed film base material F is rolled on the receiving device 30 to complete a film printing procedure.
The feeding device 10 has a supply reel 11 and a discharge driving mechanism 12, and the unprinted film substrate F is wound on the supply reel 11 and then is guided by the discharge driving mechanism 12 to be conveyed into the plurality of printing devices 20 for color separation printing. The discharging driving mechanism 12 has a plurality of conveying rollers, and the unprinted film substrate F is wound around the plurality of conveying rollers after being discharged from the supply roll 11, and the plurality of rollers drive the film substrate F, so that the film substrate F is conveyed to each printing device 20.
In this embodiment, the plurality of printing devices 20 are arranged between the feeding device 10 and the receiving device 30, the film base material F can sequentially pass through the different printing devices 20, and the plurality of printing devices 20 print the inks of different colors on the printing surface of the film base material F in a color-separation overprinting manner, so as to form a printing pattern on the printing surface of the film base material F. The printed film substrate F is rewound on the take-up reel 32 of the take-up device 30.
The material receiving device 30 includes a material receiving traction device 31 and a material receiving roller 32. The receiving traction device 31 is provided with a plurality of conveying rollers, the printed film base material F is wound on the plurality of conveying rollers of the receiving traction device 31, the printed film base material F is pulled by the receiving traction device 31 and then wound on the receiving winding drum 32, and the film printing process is completed.
As shown in fig. 2, the printing apparatus 20 of the present invention has a frame 21, and a printing cylinder 22 and a drying module 23 provided on the frame 21, respectively. The frame 21 of the film printing device 20 is designed to be vertical, so as to reduce the space occupied by the printing device 20. The feeding end of the printing device 20 is disposed on the upper end of the frame 21 facing a side of the feeding device 10, the printing cylinder 22 is disposed near the lower portion of the frame 21, the drying module 23 is disposed above the printing cylinder 22, and the discharging end of the printing device 20 is disposed on the upper end of the frame 21 facing the receiving device 30. The film substrate F enters the frame 21 from the feed end and then extends downward by being guided by the rollers 212, passes through the printing cylinder 22, then turns upward through the drying module 23, and then passes out of the discharge end at the upper end of the frame 21 to the outside of the printing unit 20. Since the infeed and outfeed ends of the individual printing units 20 are arranged at the upper end of the frame 21, the various groups of printing units 20 can be easily connected in series.
The printing cylinder 22 has a cylindrical shape, and a color plate is provided on the surface of the printing cylinder 22, and the ink for printing is applied to the color plate on the surface of the printing cylinder 22, and the printing surface of the film base material F is brought into rolling contact with the printing cylinder 22, so that the ink on the color plate is printed on the printing surface of the film base material F. The printing device 20 of the present invention further includes at least one scraper 221 disposed on a pressure adjusting device 223, wherein a side of the scraper 221 contacts the surface of the printing cylinder 22 under the control of the pressure adjusting device 223, and when the printing cylinder 22 rotates, the scraper 221 can scrape the ink on the surface of the printing cylinder 22 off, so that the ink can be uniformly coated on the surface of the printing cylinder 22. And a pressure adjusting wheel 222, disposed on the frame 21 and adjacent to the printing cylinder 22, wherein the film substrate F passes through a gap between the printing cylinder 22 and the pressure adjusting wheel 222, and the pressure adjusting wheel 222 can contact a side surface of the film substrate F opposite to the printing cylinder 22 and push against the film substrate F, so that the film substrate F contacts the printing cylinder 22 with a predetermined pressure, and the ink on the surface of the printing cylinder 22 is transferred onto the printing surface of the film substrate F (i.e., the side surface of the film substrate F facing the printing cylinder 22).
The drying module 23 is used to dry the ink on the printing surface of the film substrate F to prevent the ink on the printing surface of the film substrate F from being blurred in the subsequent process. The drying module 23 includes a vacuum isolation device 231 and a plurality of heating rollers 232. In this embodiment, the vacuum isolation device 231 has a hollow box-shaped housing 2311, the housing 2311 is wrapped outside the plurality of heating rollers 232, the housing 2311 has an inlet end 2313 and an outlet end 2314, the film substrate F passes through the vacuum isolation device 231 from the inlet end 2313 of the vacuum isolation device 231, passes through the plurality of heating rollers 232, and then passes out of the vacuum isolation device 231 from the outlet end 2314. The vacuum isolation device 231 can form a containing space close to a closed state, and one side of the vacuum isolation device 231 is connected with an air exhaust pipe 41 and is connected with an air exhaust device 40 through the air exhaust pipe 41. The air-extracting device 40 is used to extract the air inside the vacuum isolation device 231, so as to reduce the pressure inside the vacuum isolation device 231.
Specifically, the inlet 2313 and the outlet 2314 of the vacuum isolation device 231 are reserved with openings for the film substrate F to pass through, and in order to facilitate the formation of vacuum inside the vacuum isolation device 231, the gaps between the openings of the inlet 2313 and the outlet 2314 of the vacuum isolation device 231 and the film substrate F must be minimized, or air-tight members for blocking the passage of air are disposed at the openings of the inlet 2313 and the outlet 2314 to reduce the flow of external air into the vacuum isolation device 231, so as to prevent the external air from damaging the vacuum degree inside the vacuum isolation device 231.
The plurality of heating rollers 232 are disposed on the passing path of the film substrate F, the plurality of heating rollers 232 contact the film substrate F from the back side of the film substrate F (i.e., the side of the film substrate F opposite to the printing surface), and the ink on the printing surface of the film substrate F is dried by heating the film substrate F through the plurality of heating rollers 232. In this embodiment, the plurality of heating rollers 232 are arranged on the frame 21 in a direction from bottom to top, so that when the film substrate F passes through each heating roller 232, each heating roller 232 can heat the film substrate F separately, so as to evaporate moisture and other volatile substances contained in the ink. In particular, the number of the heating rollers 232 can be adjusted according to actual requirements, and as the number of the heating rollers 232 is increased, the time for the film substrate F to pass through the heating rollers 232 is also prolonged, so that the time for the film substrate F to be heated is increased.
Since the air pressure inside the vacuum isolation device 231 is lower than the atmospheric pressure, the film substrate F inside the vacuum isolation device 231 can be heated by the heating roller 232 under the environment lower than the atmospheric pressure, so that the ink on the film substrate F is heated and dried. Since the boiling point of water and the atmospheric pressure of the environment have a positive relationship, when the pressure of water is 1 atmosphere, the boiling point is 100 degrees, but when the atmospheric pressure is reduced, the boiling point of water is also reduced along with the pressure, so the invention can evaporate the water in the ink at a lower boiling point by reducing the atmospheric pressure inside the vacuum isolation device 231, thereby accelerating the drying speed. For example, in one embodiment of the present invention, the air pressure inside the vacuum isolation device 231 can be reduced to a pressure below 0.5 atm (about 0.05mpa) by the air suction device 40, and in a preferred embodiment, the air pressure inside the vacuum isolation device 231 can be reduced to a pressure below 0.1 atm (about 0.01mpa), so that the moisture in the environmental ink can be boiled and evaporated at a temperature close to room temperature, and thus the ink on the printing surface of the film substrate F can be quickly evaporated to complete the drying process.
According to the invention, the drying module 23 can quickly complete the drying procedure of the ink when the film base material F passes through the drying module 23, and when the film base material F moves to the next printing device 20 to perform the printing step of another color of ink, the original ink on the printing surface of the film base material F is completely dried and is not halated or diffused, so that the situation that the printing pattern is fuzzy is avoided.
As shown in fig. 3, in the embodiment, a cover 2312 is disposed on a side surface of a housing 2311 of the vacuum isolation device 231, and the cover 2312 is detachably disposed on the housing 2311, so that when the cover 2312 is detached, the side surface of the vacuum isolation device 231 is opened, thereby facilitating maintenance of components inside the vacuum isolation device 231, or facilitating an operator to easily insert the film substrate F into each heating roller 232.
As shown in fig. 4, a second embodiment of the printing apparatus 20 of the present invention is provided, and the basic structure of the printing apparatus 20 of the present embodiment is similar to that of the first embodiment, and therefore, the description thereof will not be repeated.
The main different technical features of the present embodiment are that the inside of the vacuum isolation device 231 of the drying module 23 is divided into a plurality of partitioned spaces S1, S2, S3 by a plurality of partition members 233, a plurality of heating rollers 232 are respectively accommodated in the different partitioned spaces S1, S2, S3, and each partitioned space S1, S2, S3 is respectively connected with an air exhaust pipe 41a, 41b, 41 c. The film base material F sequentially passes through the respective different partitioned spaces S1, S2, S3, and is heated by the heating rollers 232 in the respective partitioned spaces S1, S2, S3, respectively.
The respective partitioned spaces S1, S2, S3 of the vacuum insulation apparatus 231 of the present embodiment can be respectively connected with air-extracting devices of different strengths such that the pressures inside the respective partitioned spaces S1, S2, S3 are different from each other. In addition, the present invention can further set the temperatures of the heating rollers 232 in the different partitioned spaces S1, S2, and S3 to different temperatures, so that the film base material F can be dried in a stepwise manner under different pressures and different temperatures in the different partitioned spaces S1, S2, and S3.
For example: in one embodiment of the present invention, the pressure in each compartment S1, S2, S3 can be arranged to vary from high to low, so that the pressure in compartment S1 closest to the inlet end 2313 of housing 2311 is highest, the pressure in the intermediate compartment S2 is next lowest, and the pressure in compartment S3 closest to the outlet end 2314 is lowest. And the heating temperature of the heating roller 232 in each of the partitioned spaces S1, S2, S3 is arranged in a high-to-low manner. That is, the heating temperature in the partitioned space S1 is the highest, the heating temperature in the partitioned space S2 is the next highest, and the heating temperature in the partitioned space S3 is the lowest. In this way, the heating temperature of the heating roller 232 in each of the partitioned spaces S1, S2, S3 is adjusted according to the change in the pressure value.
In the present embodiment, the internal space of the vacuum isolation device 231 is divided into a plurality of partitions, so that the pressure in each partition S1, S2, S3 is gradually decreased by the air-extracting device in stages, and thus the requirement of approaching high vacuum is more easily achieved. In addition, the heating temperature of the heating roller 232 in each of the partitioned spaces S1, S2, and S3 can be adjusted according to the pressure value in the partitioned spaces S1, S2, and S3, so that the heating temperature can be increased due to the high boiling point in the partitioned space S1 having a low vacuum degree, and the heating temperature of the heating roller 232 in the partitioned spaces S2 and S3 can be adjusted according to the change in the boiling point because the boiling point of the liquid is decreased due to the gradual increase in the vacuum degree of the partitioned spaces S2 and S3.
As shown in fig. 5, an embodiment of the present invention also provides a thin film printing method, where the thin film printing method includes the following steps:
implementing a feeding procedure: the feeding procedure is that the film base material F to be printed is continuously conveyed through a printing cylinder 21 of a printing device 20 by a feeding device 10;
implementing a printing program: the printing procedure is to form a printing pattern by printing ink on the printing surface by rolling and contacting the printing surface of the film base material F through the printing roller 21 of the printing device 20, wherein the printing ink is water-based environment-friendly printing ink.
A drying procedure was carried out: the drying process is to continuously convey the film substrate passing through the printing cylinder 21 through the drying module 23, and the drying module 23 has a vacuum isolation device 231 and a plurality of heating rollers 232. The vacuum isolation device 231 is internally provided with an accommodating space and is provided with an inlet end 2313 and an outlet end 2314, the plurality of heating rollers 232 are accommodated in the vacuum isolation device 231, the plurality of heating rollers 232 are contacted with one side of the film substrate F opposite to the printing surface, after the film substrate F passes through the printing roller 21, the film substrate F enters the vacuum isolation device 231 from the inlet end 2313 and passes through the plurality of heating rollers 232, and then passes out of the outer side of the vacuum isolation device 231 from the outlet end 2314, the vacuum isolation device 231 is connected with an air exhaust device 40, the internal pressure of the vacuum isolation device 231 is smaller than the atmospheric pressure through the air exhaust device 40, so that the film substrate F heats the film substrate F through the heating rollers 232 in an environment smaller than the atmospheric pressure, and the ink on the film substrate F is dried.
Then, a material receiving procedure is implemented: the dried film substrate F is wound on a material collecting roll 32 by a material collecting device 30 to complete the film printing process.
In summary, the present invention has the beneficial effects that the drying module 23 can perform the step of heating and drying the film substrate F under the condition of lower than the atmospheric pressure, so that the moisture contained in the ink on the printing surface of the film substrate F can be evaporated at a lower boiling point temperature, thereby achieving the purpose of rapid drying. Therefore, the thin film printing device can easily use the environment-friendly ink without arranging a gas recovery device for collecting the volatile solvent, and can reduce the pollution of the volatile solvent.
Claims (10)
1. A thin film printing apparatus, comprising:
a printing roller for printing ink on a printing surface of a film substrate;
the drying module comprises a vacuum isolation device and a plurality of heating rollers, wherein an accommodating space is formed in the vacuum isolation device and is provided with an inlet end and an outlet end, the plurality of heating rollers are accommodated in the vacuum isolation device and are contacted with one side of the film substrate opposite to the printing surface, and the film substrate enters the vacuum isolation device from the inlet end and passes through the plurality of heating rollers after passing through the printing roller and then passes out of the outer side of the vacuum isolation device from the outlet end; and
the air extractor is connected with the vacuum isolation device and used for extracting the air in the accommodating space in the vacuum isolation device so as to ensure that the air pressure in the vacuum isolation device is lower than the atmospheric pressure;
when the film substrate passes through the drying module, the film substrate can be heated by the plurality of heating rollers in the vacuum isolation device and in an environment lower than atmospheric pressure, so that the printing ink on the film substrate is dried.
2. The film printing apparatus of claim 1, wherein said vacuum isolation device has a housing having an inlet end and an outlet end, said film substrate enters the interior of said housing from said inlet end and exits to the outside of said housing from said outlet end, and said housing is connected to a suction tube and to said suction device through said suction tube.
3. The film printing apparatus as claimed in claim 2, wherein the inside of said housing is partitioned into a plurality of partitioned spaces by a plurality of partitions, and the pressure inside each of said partitioned spaces is different.
4. The film printing apparatus as claimed in claim 3, wherein a plurality of said heating rollers are disposed in a plurality of said partitioned spaces, and heating temperatures of said heating rollers in each of said partitioned spaces are different from each other.
5. The film printing apparatus of claim 4, wherein the pressure inside the compartment closest to the inlet end is highest and the pressure inside the compartment closest to the outlet end is lowest among the plurality of compartments.
6. The film printing apparatus as recited in claim 5, wherein a cover is provided at one side of the housing, the cover being detachably provided to the housing.
7. A film printing method for printing ink on a film substrate to form a printed pattern, comprising:
implementing a feeding procedure, and continuously conveying the film substrate to be printed through a printing roller by a feeding device;
implementing a printing program, wherein the printing roller is in rolling contact with the printing surface of the film substrate, and the printing ink is printed on the printing surface to form a printing pattern;
and carrying out a drying procedure, wherein the drying procedure is to heat the film substrate printed with the ink under the environment of less than atmospheric pressure so as to dry the ink on the film substrate.
8. The film printing method as claimed in claim 7, wherein the drying module has a vacuum isolation device and a plurality of heating rollers, the vacuum isolation device has an inlet end and an outlet end, the vacuum isolation device has a receiving space formed therein, the plurality of heating rollers are received in the vacuum isolation device, the plurality of heating rollers contact one side of the film substrate opposite to the printing surface, the film substrate passes through the printing roller, enters the vacuum isolation device from the inlet end, passes through the plurality of heating rollers, and passes out of the vacuum isolation device from the outlet end, the vacuum isolation device is connected to an air exhaust device, and the air exhaust device makes the internal pressure of the vacuum isolation device less than the atmospheric pressure.
9. The film printing method as claimed in claim 8, wherein the vacuum insulation means is partitioned into a plurality of partitioned spaces by a plurality of partitions, and the pressure in each of the partitioned spaces is different.
10. The film printing method as claimed in claim 9, wherein a plurality of the heating rollers are disposed in a plurality of the partitioned spaces, and heating temperatures of the heating rollers in each of the partitioned spaces are different from each other.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201962939717P | 2019-11-25 | 2019-11-25 | |
| US62/939,717 | 2019-11-25 |
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| CN112829451A true CN112829451A (en) | 2021-05-25 |
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| CN202010476460.7A Pending CN112829451A (en) | 2019-11-25 | 2020-05-29 | Thin film printing device and printing method thereof |
| CN202020957949.1U Active CN212499437U (en) | 2019-11-25 | 2020-05-29 | Thin film printing device |
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| CN202020957949.1U Active CN212499437U (en) | 2019-11-25 | 2020-05-29 | Thin film printing device |
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| CN106274030A (en) * | 2016-08-16 | 2017-01-04 | 浙江美格机械股份有限公司 | High-speed gravure printing machine |
| CN107264005A (en) * | 2017-08-03 | 2017-10-20 | 潍坊华港包装材料有限公司 | Tipping paper water-based printing machine and tipping paper water-based printing technique |
| CN207643920U (en) * | 2017-12-21 | 2018-07-24 | 广东聚华印刷显示技术有限公司 | Minton dryer |
| CN109016798A (en) * | 2018-06-22 | 2018-12-18 | 北京威廉顺塑胶制品有限公司 | A kind of device and method of water-based ink intaglio printing PVC film |
| CN109591449A (en) * | 2018-12-25 | 2019-04-09 | 运城制版印刷机械制造有限公司 | A kind of intaglio press drying device |
| CN110406251A (en) * | 2019-07-13 | 2019-11-05 | 武汉天利包装有限公司 | A kind of drying unit of film press |
| CN212499437U (en) * | 2019-11-25 | 2021-02-09 | 魏宏帆 | Thin film printing device |
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| CN212499437U (en) | 2021-02-09 |
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