CN110722892B - Printing process of tinplate - Google Patents
Printing process of tinplate Download PDFInfo
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- CN110722892B CN110722892B CN201911200050.3A CN201911200050A CN110722892B CN 110722892 B CN110722892 B CN 110722892B CN 201911200050 A CN201911200050 A CN 201911200050A CN 110722892 B CN110722892 B CN 110722892B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/26—Printing on other surfaces than ordinary paper
- B41M1/28—Printing on other surfaces than ordinary paper on metals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/0011—Pre-treatment or treatment during printing of the recording material, e.g. heating, irradiating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
- B41M7/0081—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
- B41M7/009—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using thermal means, e.g. infrared radiation, heat
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- Application Of Or Painting With Fluid Materials (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Printing Plates And Materials Therefor (AREA)
Abstract
The invention discloses a printing process of tinplate, relates to the technical field of tinplate processing, and solves the problem that the overall quality of a product is greatly reduced because the thickness of a water film or water drops generated on the surface of the tinplate in the processing process is easy to be seriously uneven. A printing process of tinplate comprises the following steps: step one, dedusting and decontaminating; step two, powder spraying and burning; step three, coating and drying; step four, printing and baking; and step five, cooling and forming. The invention can remove water films or water drops formed on the surface of the tinplate in the printing process, so that the thickness of the coating is kept uniform, and the integral quality of the product can be further ensured.
Description
Technical Field
The invention relates to the technical field of tinplate processing, in particular to a printing process of tinplate.
Background
Tinplate, also known as tin-plated iron, is a common name for tin-plated steel sheet, and refers to a cold-rolled low-carbon steel sheet or strip with commercial pure tin plated on both sides, which combines the strength and formability of steel and the corrosion resistance, tin weldability and beautiful appearance of tin into one material, and has the characteristics of corrosion resistance, no toxicity, high strength and good ductility.
The Chinese invention patent application with the publication number of CN108839460A discloses a printing process of a tin can, which comprises the following steps: (1) surface treatment: carrying out dust removal and grease removal treatment on the tin plate; (2) printing an inner coating: coating the inner paint on the inner side of the tinplate by using a coating machine according to the requirements of the layout, wherein the thickness of the coating is 0.5-0.8mm, then putting the tinplate into an oven, the temperature of the oven is 150-; (3) printing an external coating: coating the bottom oil on the outer side surface of the tinplate for 2-4 times, and then putting the tinplate into an oven again, wherein the temperature of the oven is 100-120 ℃, and the drying time is 10-20 min; (4) plate making: making a pattern to be printed on a PS plate into a sample picture, and exposing the PS plate according to a continuous printing machine to form a printing plate; (5) printing: spraying photosensitive ink on a pattern area formed on the printing surface of the tin plate by using an ink jet printer; (6) baking: pre-baking the tin plate after the photosensitive ink spraying is finished in an ultraviolet-free environment; (7) and (3) exposure treatment: exposing the pre-baked tinplate under ultraviolet rays; (8) cleaning: washing the exposed tin plate by using a weak alkaline aqueous solution; (9) drying, namely drying the cleaned tinplate at the temperature of 80-100 ℃ for 10-20 min; (10) preparing a tank: and rolling the printed tinplate into a cylinder, welding side seams, and simultaneously performing rolling and bottom sealing to form the tinplate can.
In the above-mentioned document, a wrinkle oil is applied to a printed pattern before can formation, and the printed pattern is baked after the wrinkle oil is applied, the pattern has the three-dimensional effect, the tinplate can printed by the method has the advantages of good printing effect and strong three-dimensional effect, however, when the printing process of the tinplate can is applied in a humid environment, the humid air causes the surface of the tinplate to form a water film or water drops, so that the adhesive force between the printing coating and the tinplate is reduced, and the thickness of the coating is seriously uneven, when the thickness of the coating coated on the surface of the tinplate is not uniform, the phenomena of insufficient hardening at the thick part of the coating and excessive hardening at the thin part of the coating occur under the condition of drying at the same temperature and speed, so that the adhesiveness, the hardness, the corrosion resistance, the bending resistance, the impact resistance and the like of the coating are reduced, therefore, the overall quality of the product is greatly reduced, and therefore, a new scheme needs to be provided to solve the above problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a printing process of tinplate, which can remove water films or water drops formed on the surface of the tinplate in the printing process, so that the thickness of a coating is kept uniform, and the overall quality of a product can be further ensured.
In order to achieve the first purpose, the invention provides the following technical scheme:
a printing process of tinplate comprises the following steps:
step one, dedusting and decontaminating: removing dust from the tinplate to be processed and removing oil stains on the surface of the tinplate;
step two, powder spraying and firing: uniformly spraying the water-absorbing micro powder on the surface of the tinplate, and then burning for 5-15s by open fire to obtain a pretreated tinplate;
step three, coating and drying: coating the inner coating on the inner side of the pretreated tin plate by using a coating machine, and then drying in a vacuum environment to obtain a coated semi-finished product;
step four, printing and baking: printing ink on the cooled coated semi-finished product by using an offset press, wherein the printing temperature is 20-26 ℃, irradiating by using ultraviolet radiation until the coating is 70-80% dry, and completely drying in vacuum to obtain a printed semi-finished product;
step five, cooling and forming: and cooling and forming the printing semi-finished product to obtain a printing finished product.
By adopting the technical scheme, dust and oil stains on the tin plate can be removed in the dust removing and dirt removing process, so that the surface smoothness and the finish of the tin plate can be improved, and the printing is facilitated; then, money is coated and printed, and the water-absorbing micro powder is uniformly sprayed on the surface of the tin plate, so that a water film or water drops formed on the surface of the tin plate can be treated, the condition that the coating is easily distributed unevenly due to the direct contact of the water film or the water drops and a printing coating is avoided, the printing effect of the tin plate in the printing process is greatly improved, the water-absorbing micro powder has good binding property among the printing coatings, and the overall quality of a printed finished product can be improved; and then, open fire firing is carried out, so that moisture on the surface of the tin plate can be removed, and the water-absorbing micro powder is not easy to fall off in the processing process, thereby being beneficial to improving the stability in the processing process and ensuring the overall quality of a printed finished product. Meanwhile, in the printing and baking process, the ultraviolet irradiation is firstly used for carrying out incomplete drying, and then the baking mode is used for carrying out complete drying, so that the integral stability of the coating is favorably ensured, and the cracking or falling phenomenon is not easy to generate in the processing process.
Preferably, in the second step, the water-absorbing micro powder is prepared from montmorillonite and diatomite in a weight ratio of 1: (2-3) in the ratio.
By adopting the technical scheme, the montmorillonite has very strong adsorption capacity and cation exchange performance and good adsorption and combination capacity for moisture, so that a water film or water drops are not easily formed on the surface of the tin plate, and after the diatomite is mixed with the montmorillonite, the water-absorbing micro powder can be firmly adsorbed on the surface of the tin plate and also has good miscibility with a printing coating, and the good physicochemical performance of the diatomite is utilized, so that the quality of a printing finished product is greatly improved.
More preferably, in the second step, the particle size of the fine water-absorbing powder is 30 to 50 nm.
By adopting the technical scheme, the water-absorbing micro powder with the particle size of 30-50nm enables the surface of a printed finished product not to generate salient points easily, can keep good smoothness and smoothness, and can be uniformly distributed and adsorbed on the tin plate by utilizing the unique characteristics of nano particles, thereby being beneficial to ensuring the stable proceeding of subsequent processing.
More preferably, in the second step, the spraying amount of the water-absorbing micro powder on the surface of the galvanized iron plate is 2-5g per square meter.
Through adopting above-mentioned technical scheme, select for use above-mentioned volume of spraying, just can get rid of the adnexed moisture of tin plate in the course of working, make the difficult water film or the drop of water that forms in the surface of tin plate, and difficult production in the course of working falls the phenomenon of powder to can play good printing effect to tin plate, obtain the good printing finished product of stable quality.
More preferably, in the third step, coating and drying: coating the inner coating on the inner side of the pretreated tinplate by using a coating machine, and then drying in a vacuum environment at the drying temperature of 150 ℃ and 220 ℃ for 10-30min to obtain a coated semi-finished product.
By adopting the technical scheme and selecting the drying temperature and the drying time, the coating is not easy to crack or fall off in the drying process, the surface of the coated semi-finished product has good smoothness and finish, and the coated semi-finished product with good quality is ensured.
More preferably, the fourth step is specifically configured to print and bake: printing the ink on the cooled coating semi-finished product by using an offset press, wherein the printing temperature is 20-26 ℃, irradiating by using ultraviolet radiation until the coating semi-finished product is 70-80% dry, and completely drying in vacuum at the drying temperature of 30-70 ℃ for 8-12h to obtain the printing semi-finished product.
By adopting the technical scheme, when the ultraviolet rays are irradiated to incomplete dryness, the drying temperature and time are selected, so that the stability of the printing effect can be ensured, and a printing finished product with good quality can be obtained.
More preferably, the fifth step is specifically configured to perform cooling molding: and cooling and forming the printing semi-finished product, wherein the temperature of a cooling environment is 3-5 ℃ lower than the real-time surface temperature of the printing semi-finished product in the cooling process until the printing semi-finished product is cooled to 15-20 ℃, and obtaining the printing finished product.
Through adopting above-mentioned technical scheme, in the cooling process, set up above-mentioned cooling method to lower the temperature in less difference in temperature, can guarantee that the coating is difficult for taking place fracture or adhesive force reduction because of the quench, and make microhardness, wear resistance, thickness and the interface bonding strength of coating more even stable be favorable to guaranteeing the stability of course of working, and can obtain the good printing finished product of quality.
More preferably, in the second step, magnesium stearate accounting for 10-30% of the original mass percent is also added into the water-absorbing micropowder.
By adopting the technical scheme, the magnesium stearate is a good dispersing agent, the adhesiveness and the lubricity of the water-absorbing micro powder can be improved, the integral application effect of the water-absorbing micro powder is improved, and the integral quality of a printing product is greatly improved.
In summary, compared with the prior art, the invention has the following beneficial effects:
(1) the water-absorbing micro powder is uniformly sprayed on the surface of the tin plate, so that a water film or water drops formed on the surface of the tin plate can be treated, the condition that the coating is easily distributed unevenly due to the direct contact of the water film or the water drops and the printing coating is avoided, the printing effect of the tin plate in the printing process is greatly improved, the water-absorbing micro powder has good binding property among the printing coatings, and the overall quality of a printed finished product can be improved;
(2) after the water-absorbing micro powder is sprayed, the water-absorbing micro powder is fired by open fire, so that the water on the surface of the tin plate can be removed, the water-absorbing micro powder is not easy to fall off in the processing process, the stability in the processing process is improved, and the overall quality of a printed finished product is ensured;
(3) in the cooling forming operation, the coating is cooled in real time in a small temperature difference, so that the coating is not easy to crack or reduce the adhesive force due to quenching, the microhardness, the abrasion resistance, the thickness and the interface bonding strength of the coating are more uniform and stable, the stability of the processing process is ensured, and a printing finished product with good quality can be obtained.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
Example 1: a printing process of tinplate mainly comprises the following steps:
step one, dedusting and decontaminating: removing dust from the tinplate to be processed and removing oil stains on the surface of the tinplate;
step two, powder spraying and firing: uniformly spraying the water-absorbing micro powder on the surface of the tinplate, and then burning for 10s by open fire to obtain a pretreated tinplate;
step three, coating and drying: coating the inner coating on the inner side of the pretreated tinplate by using a coating machine, and then drying in a vacuum environment at 185 ℃ for 20min to obtain a coated semi-finished product;
step four, printing and baking: printing ink on the cooled coating semi-finished product by using an offset press, wherein the printing temperature is 23 ℃, irradiating by using ultraviolet radiation until the coating semi-finished product is 75% dry, and completely drying in vacuum at the drying temperature of 40 ℃ for 10 hours to obtain a printing semi-finished product;
step five, cooling and forming: and cooling and forming the printing semi-finished product, wherein the temperature of a cooling environment is 4 ℃ lower than the real-time surface temperature of the printing semi-finished product in the cooling process until the printing semi-finished product is cooled to 17.5 ℃, and obtaining the printing finished product.
Note: the water absorption micro powder in the step two is prepared from montmorillonite and diatomite in a weight ratio of 1: 2.5 in proportion; the particle size of the water-absorbing micro powder is 40 nm; the spraying amount of the water-absorbing micro powder on the surface of the galvanized iron plate is 3.5 g/square meter.
Example 2: the printing process of the tinplate is different from that of the embodiment 1 in that the printing process specifically comprises the following steps of:
step one, dedusting and decontaminating: removing dust from the tinplate to be processed and removing oil stains on the surface of the tinplate;
step two, powder spraying and firing: uniformly spraying the water-absorbing micro powder on the surface of the tinplate, and then burning for 5s by open fire to obtain a pretreated tinplate;
step three, coating and drying: coating the inner coating on the inner side of the pretreated tin plate by using a coating machine, and then drying in a vacuum environment at the drying temperature of 220 ℃ for 10min to obtain a coated semi-finished product;
step four, printing and baking: printing ink on the cooled coating semi-finished product by using an offset press, wherein the printing temperature is 20 ℃, irradiating by using ultraviolet irradiation until the coating semi-finished product is 80% dry, and completely drying in vacuum, wherein the drying temperature is 30 ℃ and the drying time is 12 hours to obtain a printing semi-finished product;
step five, cooling and forming: and cooling and forming the printing semi-finished product, wherein the temperature of a cooling environment is 5 ℃ lower than the real-time surface temperature of the printing semi-finished product in the cooling process until the printing semi-finished product is cooled to 15 ℃, and obtaining the printing finished product.
Example 3: the printing process of the tinplate is different from that of the embodiment 1 in that the printing process specifically comprises the following steps of:
step one, dedusting and decontaminating: removing dust from the tinplate to be processed and removing oil stains on the surface of the tinplate;
step two, powder spraying and firing: uniformly spraying the water-absorbing micro powder on the surface of the tinplate, and then burning for 15s by open fire to obtain a pretreated tinplate;
step three, coating and drying: coating the inner coating on the inner side of the pretreated tin plate by using a coating machine, and then drying in a vacuum environment at the drying temperature of 150 ℃ for 30min to obtain a coated semi-finished product;
step four, printing and baking: printing ink on the cooled coating semi-finished product by using an offset press, wherein the printing temperature is 26 ℃, irradiating by using ultraviolet radiation until the coating semi-finished product is 70% dry, and completely drying in vacuum at the drying temperature of 70 ℃ for 8 hours to obtain a printing semi-finished product;
step five, cooling and forming: and cooling and forming the printing semi-finished product, wherein the temperature of a cooling environment is 3 ℃ lower than the real-time surface temperature of the printing semi-finished product in the cooling process until the printing semi-finished product is cooled to 20 ℃, and obtaining the printing finished product.
Example 4: the printing process of tinplate is different from that of the embodiment 1 in that the water-absorbing micro powder in the step two is prepared from montmorillonite and diatomite in a weight ratio of 1: 2, and mixing the components in a ratio of 2.
Example 5: the printing process of tinplate is different from that of the embodiment 1 in that the water-absorbing micro powder in the step two is prepared from montmorillonite and diatomite in a weight ratio of 1: 3, and mixing the components in a ratio of 3.
Example 6: the difference between the printing process of tinplate and the embodiment 1 is that the particle size of the water-absorbing micro powder in the step two is 30 nm.
Example 7: the difference between the printing process of tinplate and the embodiment 1 is that the particle size of the water-absorbing micro powder in the step two is 50 nm.
Example 8: the printing process of the tinplate is different from the printing process of the embodiment 1 in that the spraying amount of the water-absorbing micro powder on the surface of the tinplate in the step two is 2g per square meter.
Example 9: the printing process of the tinplate is different from the printing process of the embodiment 1 in that the spraying amount of the water-absorbing micro powder on the surface of the tinplate in the step two is 5g per square meter.
Example 10: a process for printing tinplate is different from that of embodiment 1 in that magnesium stearate accounting for 20% of the original mass percent is added into the water-absorbing micro powder in the second step.
Example 11: a process for printing tinplate is different from that of embodiment 1 in that magnesium stearate accounting for 10% of the original mass percent is added into the water-absorbing micro powder in the second step.
Example 12: a process for printing tinplate is different from that of embodiment 1 in that magnesium stearate accounting for 30% of the original mass percent is added into the water-absorbing micro powder in the second step.
Comparative example 1: the printing process of tinplate is different from that of the embodiment 1 in that the water-absorbing micro powder in the step two is prepared from montmorillonite and diatomite in a weight ratio of 1: 1, and mixing the components in a ratio of 1.
Comparative example 2: the printing process of tinplate is different from that of the embodiment 1 in that the water-absorbing micro powder in the step two is prepared from montmorillonite and diatomite in a weight ratio of 1: 4, and mixing the components in a ratio of 4.
Comparative example 3: the difference between the printing process of tinplate and the embodiment 1 is that the grain size of the water-absorbing micro powder in the step two is 25 nm.
Comparative example 4: the difference between the printing process of tinplate and the embodiment 1 is that the particle size of the water-absorbing micro powder in the step two is 55 nm.
Comparative example 5: the printing process of the tinplate is different from the printing process of the embodiment 1 in that the spraying amount of the water-absorbing micro powder on the surface of the tinplate in the second step is 1.5g per square meter.
Comparative example 6: the printing process of the tinplate is different from the printing process of the embodiment 1 in that the spraying amount of the water-absorbing micro powder on the surface of the tinplate in the second step is 5.5g per square meter.
Comparative example 7: a printing process of tinplate is different from that of embodiment 1 in that the step five is specifically set as cooling forming: and cooling and forming the printing semi-finished product, wherein the temperature of a cooling environment is 15 ℃ until the printing semi-finished product is cooled to 20 ℃, and then obtaining the printing finished product.
Comparative example 8: a printing process of tinplate is different from that of embodiment 1 in that the step five is specifically set as cooling forming: and cooling and forming the printing semi-finished product, wherein the temperature of a cooling environment is 10 ℃ until the printing semi-finished product is cooled to 15 ℃, and obtaining the printing finished product.
Comparative example 9: the difference between the printing process of tinplate and the embodiment 1 is that montmorillonite is used as the water-absorbing micro powder in the step two.
Comparative example 10: the difference between the printing process of tinplate and the embodiment 1 is that the water-absorbing micro powder in the step two is diatomite.
Comparative example 11: a printing process of tinplate is different from that of example 1 in that the tinplate is mainly prepared by the following steps:
s1, dedusting and decontaminating: removing dust from the tinplate to be processed and removing oil stains on the surface of the tinplate;
s2, coating and drying: coating the inner coating on the inner side of a tin plate by using a coating machine, and then drying in a vacuum environment at 185 ℃ for 20min to obtain a coated semi-finished product;
s3, printing and baking: printing ink on the cooled coating semi-finished product by using an offset press, wherein the printing temperature is 23 ℃, irradiating by using ultraviolet radiation until the coating semi-finished product is 75% dry, and completely drying in vacuum at the drying temperature of 40 ℃ for 10 hours to obtain a printing semi-finished product;
s4, cooling and forming: and cooling and forming the printing semi-finished product, wherein the temperature of a cooling environment is 4 ℃ lower than the real-time surface temperature of the printing semi-finished product in the cooling process until the printing semi-finished product is cooled to 17.5 ℃, and obtaining the printing finished product.
Performance testing
Test samples: the tinplate iron printing coating Y500-SC golden yellow coating is selected and purchased from Itanium chemical Co., Ningbo city; the ink is prepared from Malay iron UV ink which is purchased from New Material Co., Ltd, of great Asia Bay Xin, Huizhou city; a TH415 tinplate coil tinplate is selected and purchased from Shanghai Zhenti industries, Ltd.
The test method comprises the following steps: the printing process of the tinplate in the examples 1-12 and the tinplate in the comparative examples 1-11 is selected, 20 pieces of printing finished products are prepared according to the selection of test samples, then the printing effect of the surfaces of the printing finished products is observed, and the printing finished products are scored according to the industrial standard requirement of QB 1877-1993 packaging decoration tin (chromium) plated thin steel plate printing, wherein the full score is 100, and the higher the score is, the better the printing effect is. Meanwhile, 20 printed products were tested by a rotary drum abrader method, respectively, and the temperature of the test environment was maintained at 30 ℃, and the abrasion amount (mg) of each printed product was recorded.
And (3) test results: the test results of examples 1 to 12 and comparative examples 1 to 11 are shown in Table 1. As can be seen from Table 1, the comparison of the test results of examples 1 to 3 and comparative examples 9 to 11 shows that the use of the water-absorbing micropowder composed of montmorillonite and diatomaceous earth in the processing process can greatly improve the overall printing effect of the process and greatly reduce the abrasion loss, and the montmorillonite and the diatomaceous earth can have good synergistic interaction, thereby greatly improving the overall quality of the product. From the comparison of the test results of examples 4-10 and example 1, the ratio, particle size and spraying amount of montmorillonite and diatomite in the water-absorbing micro powder disclosed by the invention can obtain a printing finished product with good and stable quality. From the comparison of the test results of examples 10 to 12 and example 1, the addition of magnesium stearate to the fine water-absorbing powder improves the overall application effect of the fine water-absorbing powder and thus greatly improves the overall quality of the printed product. The comparison of the test results of examples 1 to 9 and comparative examples 1 to 9 shows that the proportion, particle size and spraying amount range of montmorillonite and diatomite in the water-absorbing micro powder selected by the invention are all preferred ranges, and the quality of the printing finished product can be ensured.
TABLE 1 test results of examples 1 to 12 and comparative examples 1 to 11
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (6)
1. A printing process of tinplate is characterized by comprising the following steps:
step one, dedusting and decontaminating: removing dust from the tinplate to be processed and removing oil stains on the surface of the tinplate;
step two, powder spraying and firing: uniformly spraying the water-absorbing micro powder on the surface of the tinplate, and then burning for 5-15s by open fire to obtain a pretreated tinplate;
step three, coating and drying: coating the inner coating on the inner side of the pretreated tin plate by using a coating machine, and then drying in a vacuum environment to obtain a coated semi-finished product;
step four, printing and baking: printing ink on the cooled coated semi-finished product by using an offset press, wherein the printing temperature is 20-26 ℃, irradiating by using ultraviolet radiation until the coating is 70-80% dry, and completely drying in vacuum to obtain a printed semi-finished product;
step five, cooling and forming: cooling and molding the printing semi-finished product, wherein the temperature of a cooling environment is 3-5 ℃ lower than the real-time surface temperature of the printing semi-finished product in the cooling process until the printing semi-finished product is cooled to 15-20 ℃, and obtaining the printing finished product;
in the second step, the water-absorbing micro powder is prepared from montmorillonite and diatomite in a weight ratio of 1: (2-3) in the ratio.
2. The process for printing tinplate as claimed in claim 1, wherein in the second step, the particle size of the fine water-absorbing powder is 30-50 nm.
3. The printing process of tinplate according to claim 1, wherein in the second step, the spraying amount of the water-absorbing micro powder on the surface of the tinplate is 2-5g per square meter.
4. The process for printing tinplate as claimed in claim 1, wherein in step three, coating and drying: coating the inner coating on the inner side of the pretreated tinplate by using a coating machine, and then drying in a vacuum environment at the drying temperature of 150 ℃ and 220 ℃ for 10-30min to obtain a coated semi-finished product.
5. The process for printing tinplate according to claim 1, wherein the fourth step is specifically configured to print and bake: printing the ink on the cooled coating semi-finished product by using an offset press, wherein the printing temperature is 20-26 ℃, irradiating by using ultraviolet radiation until the coating semi-finished product is 70-80% dry, and completely drying in vacuum at the drying temperature of 30-70 ℃ for 8-12h to obtain the printing semi-finished product.
6. The printing process of tinplate as claimed in claim 1, wherein in step two, magnesium stearate accounting for 10-30% of the original mass percent is further added into the water-absorbing micropowder.
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