CN115091873A - Method for thermoprinting multicolor rainbow gradient pattern effect on paper package - Google Patents
Method for thermoprinting multicolor rainbow gradient pattern effect on paper package Download PDFInfo
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- CN115091873A CN115091873A CN202210672119.8A CN202210672119A CN115091873A CN 115091873 A CN115091873 A CN 115091873A CN 202210672119 A CN202210672119 A CN 202210672119A CN 115091873 A CN115091873 A CN 115091873A
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- 230000000694 effects Effects 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000007639 printing Methods 0.000 claims abstract description 75
- 239000003086 colorant Substances 0.000 claims abstract description 30
- 238000004806 packaging method and process Methods 0.000 claims abstract description 20
- 238000010030 laminating Methods 0.000 claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- 238000007711 solidification Methods 0.000 claims abstract description 3
- 238000003860 storage Methods 0.000 claims description 40
- 238000009826 distribution Methods 0.000 claims description 23
- 238000005192 partition Methods 0.000 claims description 10
- 230000000007 visual effect Effects 0.000 abstract description 3
- 238000007650 screen-printing Methods 0.000 abstract description 2
- 239000000976 ink Substances 0.000 description 166
- 239000000047 product Substances 0.000 description 20
- 238000005516 engineering process Methods 0.000 description 12
- 239000012528 membrane Substances 0.000 description 6
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 4
- 239000010931 gold Substances 0.000 description 4
- 229910052737 gold Inorganic materials 0.000 description 4
- 238000007646 gravure printing Methods 0.000 description 3
- 239000012466 permeate Substances 0.000 description 3
- 238000003854 Surface Print Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000004040 coloring Methods 0.000 description 1
- 238000007647 flexography Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007645 offset printing Methods 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F9/00—Rotary intaglio printing presses
- B41F9/02—Rotary intaglio printing presses for multicolour printing
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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
- B41F19/02—Apparatus or machines for carrying out printing operations combined with other operations with embossing
- B41F19/06—Printing and embossing between a negative and a positive forme after inking and wiping the negative forme; Printing from an ink band treated with colour or "gold"
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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
- B41F23/08—Print finishing devices, e.g. for glossing prints
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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
- B41M1/10—Intaglio printing ; Gravure printing
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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
- B41M1/12—Stencil printing; Silk-screen printing
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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
- B41M1/14—Multicolour printing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/14—Security printing
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Printing Methods (AREA)
Abstract
The invention belongs to the technical field of printing, and particularly relates to a method for hot stamping a multicolor rainbow gradient pattern effect on a paper package, which comprises the following steps: (1) after the laser thermoprinting film is manufactured, printing multicolor printing ink on the laser thermoprinting film by using a gravure press, so that the thermoprinting film has colors with laser effect and multicolor rainbow gradient effect simultaneously; (2) printing raised printing ink on the surface of a paper product by using a screen printing machine and performing semi-solidification; (3) the manufactured hot stamping film with the multicolor rainbow gradient colors is arranged on a film laminating machine, then the paper products printed with the lettering ink are placed on the film laminating machine and are combined and pressed, and paper feeding is carried out to finish hot stamping manufacture, so that the printing packaging product with the multicolor rainbow gradient colors containing the lettering is obtained. The invention can realize the printing of products with multicolor rainbow gradient pattern effect, can improve the anti-counterfeiting performance and visual impact of printed packages, and has the anti-counterfeiting function which is easy to be identified by consumers.
Description
Technical Field
The invention belongs to the technical field of printing, and particularly relates to a method for hot stamping a multicolor rainbow gradient pattern effect on a paper package.
Background
The hot stamping film is the most important anti-counterfeiting element on the packaging, and the anti-counterfeiting requirement of the current printed packaging products is higher and higher. The method for manufacturing the paper package with the multicolor rainbow gradient effect by hot stamping is difficult to imitate the same type of package, thereby preventing the counterfeit and fake products from entering the market and solving the problem of single hot stamping effect of the printed package.
The existing hot stamping film (such as an alumite) is provided with a plain film or a laser film, and the hot stamping film with the multicolor rainbow gradient effect is zero (belonging to the technical defect of the previous hot stamping film manufacture).
At present, the printing and packaging industry can not finish the manufacture of a hot stamping product with a multicolor rainbow gradual change effect on packages, the existing multicolor printing products realize color restoration by offset printing, gravure printing and flexography, and do not have any gradual change effect.
The hot stamping film (such as an alumite film) is the most main anti-counterfeiting element on a printed packaging product, and has the performance of beautifying the packaging, while the currently used hot stamping film does not have the effect of gradual change of a multicolor rainbow, and has a very low impact distance to vision. The gilding mode that present printing packaging trade used all is gilding press like the concora crush flat, round flattening, round pressing gilding press, and these gilding presses all need be with the help of gilding edition, because gilding edition's size is less, can't accomplish the thermoprint preparation of large tracts of land, and can't accomplish the colour of a plurality of thermoprint membranes of same lines thermoprint on packing, because same root line, the place of two thermoprint membrane wiring has gap (leaking white).
Disclosure of Invention
In order to solve the technical problem, the invention provides a method for hot stamping a multi-color rainbow gradient pattern effect on a paper package, which can realize the printing of a product with the multi-color rainbow gradient pattern effect.
The specific technical scheme is as follows: the gravure equipment capable of printing the colorful gradient effect comprises a gravure press (an intaglio printing press), wherein the gravure press (the intaglio printing press) comprises an ink tank, a plate cylinder is arranged on the ink tank, a pressure cylinder is arranged above the plate cylinder, paper can penetrate through a gap between the plate cylinder and the pressure cylinder, and a scraper is also arranged above the plate cylinder; the ink tank is divided into an ink storage tank and a roller tank, the ink storage tank is used for temporarily storing ink, and the roller tank is used for the contact between the plate roller and the ink; the ink storage tank is composed of a plurality of ink distribution tanks, and inks with different colors are displayed in the ink distribution tanks. Different printing ink is added into each ink distributing groove of the ink storage groove, adjacent ink with different colors can be contacted and permeated in the process that the ink flows into the roller groove, and thus, the printing process of the plate roller forms a colorful and gradient effect on printed matters such as paper and the like.
Furthermore, a plurality of grooves are formed in the inner side of the rear wall of the ink storage tank, partition plates are arranged in the grooves, and the ink storage tank is divided into a plurality of ink distribution tanks through the partition plates. One ink storage tank is divided into a plurality of ink dividing tanks by partition plates, and each ink dividing tank is used for displaying ink with different colors.
Furthermore, a plurality of ink distribution grooves are arranged in the ink storage groove, and are sleeved in the ink storage groove; each ink dividing groove is similar to the ink storage groove in structure, but is smaller than the ink storage groove in width, so that a plurality of ink dividing grooves are arranged side by side in the ink storage groove, and a structure that a plurality of ink dividing grooves are arranged in one large ink storage groove is formed. Specifically, the ink distribution groove consists of two side walls, a rear wall and a bottom plate, and the front end of the ink distribution groove is open, so that ink can conveniently enter the roller groove.
Furthermore, a pair of grooves are formed in the front end of the ink distribution groove, and baffles are movably arranged in the grooves. The baffle can make the printing ink in the branch china ink groove in the holding ink tank keep the stable state (can stand for a period of time when necessary), under the circumstances of adding quantitative printing ink (can measure the printing ink through the household utensils of measurable capacity such as graduated flask), when pulling up the baffle and releasing printing ink, quantitative printing ink flow state is relatively stable unified, the gradual change colour state that causes the printing ink of different colours to permeate each other in the cylinder groove and form is relatively stable to avoid directly adding printing ink to dividing the china ink groove, because of the printing ink initial condition in every branch china ink groove is non-uniform, cause to form the condition that colorful gradual change colour effect is non-uniform, unstable.
The method for hot stamping colorful and gradually-changed color pattern effects on the paper package comprises the following steps: (1) after the laser hot stamping film is manufactured, printing multicolor printing ink on the laser hot stamping film by using a gravure press, so that the hot stamping film has colors with laser effects and multicolor gradient effects;
(2) printing raised ink on the surface of a paper product by using a screen printer and performing semi-curing (the screen printer generally has three illuminating lamps for curing, the machine speed is 20 m/s, full curing can be achieved, and the machine speed is increased to 40 m/s, so that the semi-curing can be completed); through the semi-curing to the raised letter printing ink, can be for follow-up on laminating machine thermoprint membrane and the good glutinous condition that glues of the raised letter printing ink of paper article surface printing, and thermoprint membrane and the regional not sticky state that keeps gluing of the raised letter printing ink of paper article surface, be convenient for realize that the regional radium-shine effect of raised letter printing ink and colorful gradual change color effect are colored.
(3) The manufactured hot stamping film with the colorful gradient colors is arranged on a film laminating machine, then the paper product printed with the raised printing ink is placed on the film laminating machine and is combined and pressed, and paper feeding is carried out to finish hot stamping manufacturing, so that the printing packaging product with the colorful gradient colors containing the raised characters is obtained.
Further, the multicolor ink is CMYK ink.
The printing four-color mode, CMYK for short, is a color register mode used in color printing, and utilizes the principle of mixing colors of three primary colors of coloring materials and black ink to mix and superimpose four colors in total to form so-called "full-color printing". The gravure press can truly reproduce the effect of the original manuscript, and has rich and clear layers, thick and solid ink layers, high ink saturation and bright color.
The invention mainly makes the production completed through a gravure press plus a screen printer plus a film laminating machine, firstly uses the gravure press to print ink (such as ink CMYK) on a laser thermoprinting film, so that the thermoprinting film has laser effect and colorful gradient effect, then installs the thermoprinting film with the colorful gradient effect on the film laminating machine, uses a screen printer to print raised printing ink on the surface of a paper product and semi-cures the raised printing ink, then puts the printed product printed with the raised printing ink on the film laminating machine, presses the printed product together, and feeds the paper to complete the production of the thermoprinting effect, thereby obtaining a hot printed product with the colorful gradient effect.
Compared with the prior art, the invention can solve the following problems:
(1) the problem of single effect of hot stamping of printed packaging (package printing industry, the hot stamping is called as gold stamping) is solved.
(2) Solves the technical problems that the traditional hot stamping technology can not realize the hot stamping of connecting wires and the colorful gradient hot stamping, and adds a new technology for hot stamping (gold stamping) on paper packages.
(3) The technical defects of manufacturing the multicolor hot stamping film are overcome, the variety and the color of the hot stamping film are enriched, and the hot stamping film with the multicolor gradient color effect (the hot stamping film is called as the hot stamping film in the packaging printing industry) is applied to packaging printing.
(4) The anti-counterfeiting performance and the visual impact of the printed packaging product are improved, and the anti-counterfeiting function which is easy to identify by consumers is achieved.
Drawings
FIG. 1 shows a photo of a thermoprinting film with a laser effect;
FIG. 2 is a photo of a hot stamping film with laser effect and multi-color gradient effect;
FIG. 3 is a diagram showing the effect of the printed packaging product containing various gradient colors of raised letters or pictures;
FIG. 4 is a schematic diagram of a gravure press;
FIG. 5 is a schematic top view of an ink tank containing a partition;
FIG. 6 is a schematic side view of an ink tank containing a spacer and a plate cylinder;
FIG. 7 is a schematic top view of an ink tank containing a baffle and a baffle;
FIG. 8 is a schematic side view of an ink tank containing a baffle and a plate cylinder;
wherein, 1 ink groove; 2 a plate cylinder; 3, a pressure roller; 4, paper; 5, scraping a blade; 6, an ink storage tank; 7 minute ink groove; 8, a roller groove; 9 a partition board; 10 baffle plate.
Detailed Description
Example 1
A gravure device capable of printing colorful gradient effect comprises a gravure press (intaglio printing press), wherein the gravure press (intaglio printing press) comprises an ink tank 1, a plate cylinder 2 is arranged on the ink tank 1, a pressure cylinder 3 is arranged above the plate cylinder 2, paper 4 can pass through a gap between the plate cylinder 2 and the pressure cylinder 3, and a scraper 5 is also arranged above the plate cylinder 2; the ink tank 1 is divided into an ink storage tank 6 and a roller tank 8, the ink storage tank 6 is used for temporarily storing ink, and the roller tank 8 is used for contacting the plate roller 2 with the ink; the ink storage tank 1 is composed of a plurality of ink distribution tanks 7, and inks of different colors are displayed in the ink distribution tanks 7. Different printing ink is added into each ink distributing groove of the ink storage groove 1, adjacent ink with different colors can mutually contact and permeate in the process that the ink flows into the roller groove, and the printing process of the plate roller forms the effect of colorful and gradual color change on printed matters such as paper and the like.
Example 2
The gravure printing device capable of printing the multicolor gradient effect as shown in fig. 4 to 6 comprises a gravure press (intaglio printing press), wherein the gravure press (intaglio printing press) comprises an ink tank 1, a plate cylinder 2 is arranged on the ink tank 1, a pressure cylinder 3 is arranged above the plate cylinder 2, paper 4 can pass through a gap between the plate cylinder 2 and the pressure cylinder 3, and a scraper 5 is also arranged above the plate cylinder 2; the ink tank 1 is divided into an ink storage tank 6 and a roller tank 8, the ink storage tank 6 is used for temporarily storing ink, and the roller tank 8 is used for contacting the plate roller 2 with the ink; the ink storage tank 1 is composed of a plurality of ink distribution tanks 7, and inks of different colors are displayed in the ink distribution tanks 7. Different printing ink is added into each ink distributing groove of the ink storage groove 1, adjacent ink with different colors can be contacted and permeated in the process that the ink flows into the roller groove, and thus, the printing process of the plate roller forms a colorful and gradient effect on printed matters such as paper and the like.
Further, a plurality of grooves are formed in the inner side of the rear wall of the ink storage tank 1, partition plates 9 are arranged in the grooves, and the ink storage tank 1 is divided into a plurality of ink distribution tanks 7 through the partition plates 9. One ink storage tank 1 is divided into a plurality of ink dividing tanks 7 by partition plates 9, and each ink dividing tank 7 is used for displaying ink with different colors. The partition board 9 arranged by the groove is convenient to detach and clean.
Example 3
A gravure equipment capable of printing colorful gradient color effect comprises a gravure press (intaglio printing press), wherein the gravure press (intaglio printing press) comprises an ink tank 1, a plate cylinder 2 is arranged on the ink tank 1, a pressure cylinder 3 is arranged above the plate cylinder 2, paper 4 can pass through a gap between the plate cylinder 2 and the pressure cylinder 3, and a scraper 5 is also arranged above the plate cylinder 2; the ink tank 1 is divided into an ink storage tank 6 and a roller tank 8, wherein the ink storage tank 6 is used for temporarily storing ink, and the roller tank 8 is used for the contact of the plate roller 2 and the ink; the ink storage tank 1 is composed of a plurality of ink distribution tanks 7, and inks of different colors are displayed in the ink distribution tanks 7. Different printing ink is added into each ink distributing groove of the ink storage groove 1, adjacent ink with different colors can mutually contact and permeate in the process that the ink flows into the roller groove, and the printing process of the plate roller forms the effect of colorful and gradual color change on printed matters such as paper and the like.
Further, a plurality of ink distributing grooves 7 are arranged in the ink storage groove 1, and the ink distributing grooves 7 are sleeved in the ink storage groove 1; that is, each ink dividing groove 7 has a similar structure to the ink storage groove 1 but is smaller in width than the ink storage groove, so that a plurality of ink dividing grooves are arranged side by side in the ink storage groove to form a structure in which a plurality of ink dividing grooves are provided in one large ink storage groove. Specifically, the ink distribution groove is composed of two side walls, a rear wall and a bottom plate, and the front end of the ink distribution groove is open, so that ink can enter the roller groove 8 conveniently.
Example 4
On the basis of embodiments 2-3, further, divide the china ink groove 7 front end to have a pair of recess, the activity is provided with baffle 9 in the recess (as shown in fig. 7 and 8), and the baffle 9 through the recess setting is convenient for baffle 9 to move about and dismantle the washing. The baffle 9 can keep the ink in the ink distributing groove 7 in the ink storing groove 6 in a stable state (can stand for a period of time if necessary), under the condition of adding quantitative ink (the ink is measured by a vessel with measurable capacity such as a measuring cylinder), when the baffle is pulled up to release the ink, the flowing state of the quantitative ink is relatively stable and uniform, and the gradual change color state formed by the mutual permeation of different colors of ink in the roller groove is relatively stable, so that the ink is prevented from being directly added into the ink distributing groove, and the condition of non-uniform and unstable colorful gradual change color effect is caused because the initial state of the ink in each ink distributing groove is non-uniform.
The method for hot stamping the effect of the multicolor rainbow gradient pattern on the paper packaging comprises the following steps:
(1) after the laser hot stamping film is manufactured, printing multicolor printing ink on the laser hot stamping film by using a gravure press, so that the hot stamping film has colors with laser effects and multicolor gradient effects at the same time, as shown in fig. 2;
(2) printing raised ink on the surface of a paper product by using a screen printer and performing semi-solidification; the curing of the screen machine generally comprises three illuminating lamps, the machine speed is 20 m/s, the full curing can be achieved, the machine speed is increased to 40 m/s, and the semi-curing can be completed; through the semi-curing to the raised letter printing ink, can be for follow-up on laminating machine thermoprint membrane and the good glutinous condition that glues of the raised letter printing ink of paper article surface printing, and thermoprint membrane and the regional not sticky state that keeps gluing of the raised letter printing ink of paper article surface, be convenient for realize that the regional radium-shine effect of raised letter printing ink and colorful gradual change color effect are colored.
(3) The manufactured hot stamping film with the multi-color gradually-changed colors is arranged on a film laminating machine, then the paper product printed with the lettering ink is placed on the film laminating machine and is combined and pressed, and paper feeding is carried out to finish hot stamping manufacture, so that the printing packaging product with the multi-color gradually-changed colors is obtained, and is shown in figure 3.
Further, the multi-color ink is a CMYK ink.
The invention has the following characteristics:
(1) method for manufacturing colorful gradient color hot stamping film
Printing ink (such as ink CMYK) on the laser thermoprinting film through a gravure press, so that the thermoprinting film increases the color reduction of printing colors on the basis of having a laser effect, and the thermoprinting film with the colorful gradient-color effect is obtained.
(2) Technical method for combining gravure printing, silk-screen printing and film laminating machine
The production is completed through the gravure press plus the screen printer plus the film laminating machine, the gravure press plus the screen printer plus the film laminating machine is technically integrated, the technology is a novel hot stamping technology, the technology enables the colorful gradient hot stamping film to be applied to packaging, and the printing technology is combined with the transfer hot stamping technology.
(3) Anti-counterfeiting technology for multicolor gradient thermoprinting film
The hot stamping technology of the colorful gradient color hot stamping film improves the anti-counterfeiting performance of a package, fundamentally avoids counterfeiting the same package, fully enriches the diversity of packaging materials, enhances the visual impact force of the hot stamping film, improves the anti-counterfeiting performance of a product, and has the function of easy recognition by consumers.
(4) Wiring thermoprinting technology and novel gold stamping technology
The invention can finish the manufacture of hot stamping products with colorful gradient color effect, and simultaneously adds a novel hot stamping (gold stamping) technology in the printing and packaging industry.
Claims (6)
1. A method for hot stamping multicolor rainbow gradient pattern effect on paper packaging is characterized by comprising the following steps:
(1) after the laser thermoprinting film is manufactured, printing multicolor printing ink on the laser thermoprinting film by using a gravure press, so that the thermoprinting film has colors with a laser effect and a multicolor rainbow gradient effect simultaneously;
(2) printing raised ink on the surface of a paper product by using a screen printer and performing semi-solidification;
(3) the manufactured hot stamping film with the multicolor rainbow gradient colors is arranged on a film laminating machine, then the paper products printed with the lettering ink are placed on the film laminating machine and are combined and pressed, and paper feeding is carried out to finish hot stamping manufacture, so that the printing packaging product with the multicolor rainbow gradient colors containing the lettering is obtained.
2. The method for stamping a multicolor rainbow gradient pattern effect on paper packaging according to claim 1, wherein said multicolor ink is CMYK ink.
3. The method for printing multicolor rainbow gradient pattern effect on paper packages according to claim 1, wherein said gravure press in step (1) comprises an ink tank having a plate cylinder disposed thereon, a pressure cylinder disposed above the plate cylinder, a paper passing through a gap between the plate cylinder and the pressure cylinder, and a scraper disposed above the plate cylinder;
the ink tank is divided into an ink storage tank and a roller tank, the ink storage tank is used for temporarily storing ink, and the roller tank is used for contacting the plate roller with the ink;
the ink storage tank is composed of a plurality of ink distribution tanks, and ink with different colors is stored in the ink distribution tanks.
4. The method as claimed in claim 3, wherein the ink tank is divided into several ink distribution tanks by partitions.
5. The method for hot stamping multicolor rainbow gradient pattern effect on paper package as claimed in claim 3, wherein said ink storage tank has several ink distribution grooves, said ink distribution grooves are sleeved in said ink storage tank, said ink distribution grooves are composed of two side walls, a back wall and a bottom plate, the front end of said ink distribution groove is opened to facilitate the ink entering into said roller groove.
6. The method for hot stamping multicolor rainbow gradient pattern effect on paper package as claimed in claim 4 or 5, wherein the front end of the ink dividing groove is provided with a pair of grooves, and baffles are movably arranged in the grooves.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210672119.8A CN115091873A (en) | 2022-06-15 | 2022-06-15 | Method for thermoprinting multicolor rainbow gradient pattern effect on paper package |
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| CN202210672119.8A CN115091873A (en) | 2022-06-15 | 2022-06-15 | Method for thermoprinting multicolor rainbow gradient pattern effect on paper package |
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Application publication date: 20220923 |