Gravure and flexographic printing combined playing card printing method

Abstract

The invention discloses a gravure and flexographic printing combined playing card printing method. The method comprises the following steps: ink preparation: preparing chlorinated polypropylene resin, chlorinated polyolefin, an organic solvent, a biocide, a latex adhesive, a cross-linking agent, a cosolvent, a curing agent and a disperse dye; a heating step of applying the ink onto a recording medium and heating the ink to diffuse the disperse dye in the particles of the latex binder and the co-solvent and develop color; and pressure adjustment: selecting a doctor blade with a proper size based on a printing machine, and adjusting the pressure applied to the plate cylinder by the doctor blade according to the printing speed. The ink is coated on a recording medium and heated, so that the disperse dye diffuses and develops color in particles of the latex adhesive and the cosolvent, and a printed matter with brighter color can be obtained by combining with the organic solvent and using the sublimable dye, and is stable in color and difficult to decolor.

Description

Technical Field

[0001] The present invention relates to the technical field of printing methods, and in particular to a printing method for playing cards that combines intaglio printing and flexographic printing. Background Art

[0002] Playing cards are a type of gaming card commonly used in playing card games, and the patterns on playing cards are printed through a printing machine.

[0003] Printing is a printing method that uses an intaglio plate formed with grooves for containing ink to transfer the ink onto a printing substrate. The quality of printing can be controlled by using the depth of the grooves and the spacing (line count) of the grooves, enabling high-precision printing, and thus it is widely used.

[0004] In intaglio printing, oil-based ink is generally used. The amount of oil-based ink used is large, and the quality of the ink is related to the quality of printing. However, existing inks mainly include pigments, binders, fillers, diluents, reducers, anti-skinning agents, anti-set-off agents, slip agents, etc. But we found that the color of the printed playing cards is relatively dull, and the conventional addition of color intensifiers is prone to falling off after being used for a period of time, resulting in a decline in quality. Summary of the Invention

[0005] The purpose of the present invention is to solve the deficiencies existing in the prior art, and to propose a printing method for playing cards that combines intaglio printing and flexographic printing.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions: A printing method for playing cards that combines intaglio printing and flexographic printing, including the following steps: S1: Ink preparation: Prepare chlorinated polypropylene resin, chlorinated polyolefin, organic solvent, biocide, latex binder, crosslinking agent, cosolvent, curing agent, and disperse dye; S2: Heating process: Coat the ink on a recording medium and heat it to cause the disperse dye to diffuse and develop color in the particles of the latex binder and cosolvent; S3: Pressure adjustment: Select a doctor blade with a suitable size based on the printing machine, adjust the pressure applied by the doctor blade on the plate cylinder according to the printing speed, and set the angle between the doctor blade and the plate to be between 65° and 70°, and set the pressure of the impression cylinder based on the material of the substrate.

[0007] S4: Imprinting: Use an inking device to transfer the ink in the ink trough onto the plate cylinder, and then use a doctor blade to scrape off the ink on other parts of the plate cylinder except for the recessed parts; transfer the ink in the recessed parts onto the substrate through the impression cylinder, and the line count on the plate cylinder is 88 - 100 lines.

[0008] As a further aspect of the present invention, the dispersed pigment comprises a dispersant crosslinked around the pigment, and the dispersed pigment comprises a carboxyl-functional dispersant crosslinked around a pigment core by a crosslinking agent having at least two groups.

[0009] As a further aspect of the present invention, the organic solvent has a solubility parameter greater than 27.5 at 25 °C.

[0010] As a further aspect of the present invention, the ratio of the chlorinated polypropylene resin, chlorinated polyolefin, organic solvent, biocide, latex binder, cosolvent, curing agent, and disperse dye is 1:2:2:3:0.8:1:3:2.

[0011] As a further aspect of the present invention, the polymeric latex binder comprises a mixture of: an acrylic latex binder and a polyurethane latex binder; an acrylic latex binder and a polyester latex binder; a polyester latex binder and a polyurethane latex binder; or an acrylic latex binder, a polyester latex binder, and a polyurethane latex binder.

[0012] As a further aspect of the present invention, the average particle size of the pigment particles is 120 nm or more and 350 nm or less.

[0013] As a further aspect of the present invention, the crosslinking agent is an epoxy-based crosslinking agent.

[0014] As a further aspect of the present invention, the curing agent is vinyltriamine DETA and aminoethylpiperazine AE, which has a solubility parameter less than 27.5 at 25 °C.

[0015] The beneficial effects of the present invention are as follows: In the present invention, the ink is coated on a recording medium and heated, so that the disperse dye diffuses and develops color in the particles of the latex binder and the cosolvent, and by combining with the organic solvent and using a sublimable dye, a printed matter with brighter colors can be obtained, and the color is stable and difficult to decolorize.

[0016] In the present invention, the adjustment of the angle between the doctor blade and the printing plate improves the printing quality of the ink and reduces the printing cost, and the ink provided can adhere well to the printing substrate.

[0017] In the present invention, intaglio printing and flexographic printing are combined. By adjusting the pressure, a doctor blade of a suitable size is selected based on the printing machine, and the pressure applied by the doctor blade on the plate cylinder is adjusted according to the printing speed, and intaglio printing and flexographic printing are adaptively switched. When the intaglio printing pressure is increased, for flexographic printing, the doctor blade is adjusted to be close to the printing substrate. Detailed Embodiments

[0018] A method for printing playing cards by combining intaglio printing and flexographic printing, comprising the following steps: S1: Ink Preparation: Prepare chlorinated polypropylene resin, chlorinated polyolefin, organic solvent, biocide, latex binder, crosslinking agent, cosolvent, curing agent, and disperse dye; S2: Heating Process: Coat the ink on the recording medium and heat it to allow the disperse dye to diffuse and develop color in the particles of the latex binder and cosolvent; When the ink is coated on the recording medium and heated, the disperse dye diffuses and develops color in the particles of the latex binder and cosolvent, and by combining with the organic solvent and using sublimable dyes, a printed matter with more vivid colors can be obtained.

[0019] S3: Pressure Adjustment: Select a doctor blade with a suitable size based on the printing machine, adjust the pressure applied by the doctor blade on the plate cylinder according to the printing speed, and set the angle between the doctor blade and the plate between 65° and 70°, and set the pressure of the impression cylinder based on the material of the substrate.

[0020] S4: Imprinting: Use an inking device to transfer the ink in the ink trough to the plate cylinder, and then use a doctor blade to scrape off the ink on other parts except the recessed parts on the plate cylinder; Transfer the ink in the recessed parts to the substrate through the impression cylinder. The number of screen lines on the plate cylinder is 88 - 100 lines, making the ink more evenly compacted and improving the quality.

[0021] In this embodiment, the disperse pigment contains a dispersant crosslinked around the pigment, and the disperse pigment contains a carboxyl-functional dispersant crosslinked around the pigment core by a crosslinking agent having at least two groups.

[0022] In this embodiment, the organic solvent has a solubility parameter greater than 27.5 at 25°C.

[0023] In this embodiment, the ratio of chlorinated polypropylene resin, chlorinated polyolefin, organic solvent, biocide, latex binder, cosolvent, curing agent, and disperse dye is 1:2:2:3:0.8:1:3:2.

[0024] In this embodiment, the polymeric latex binder contains the following mixtures: acrylic latex binder and polyurethane latex binder; acrylic latex binder and polyester latex binder; polyester latex binder and polyurethane latex binder; or acrylic latex binder, polyester latex binder, and polyurethane latex binder.

[0025] In this embodiment, the average particle size of the pigment particles is above 120nm and below 350nm.

[0026] In this embodiment, the crosslinking agent is an epoxy-based crosslinking agent. The crosslinking agent causes chemical bonds to form between linear molecules, connecting the linear molecules together to form a network structure, improving the strength and elasticity of the printing material.

[0027] In this embodiment, the curing agent is vinyltriamine DETA and aminoethylpiperazine AE, which has a solubility parameter of less than 27.5 at 25 °C.

[0028] During use: Adjusting the angle between the doctor blade and the printing plate improves the printing quality of the ink and reduces the printing cost, and the ink provided can adhere well to the printing substrate; Combining gravure printing and flexographic printing, by adjusting the pressure, select a doctor blade of an appropriate size based on the printing machine, adjust the pressure applied by the doctor blade on the plate cylinder according to the printing speed, and perform an adaptive switch between gravure printing and flexographic printing. Increase the gravure printing pressure and adjust the doctor blade to closely adhere to the printing substrate for flexographic printing. Furthermore, the ink is coated on the recording medium and heated, so that the disperse dye diffuses and develops color in the particles of the latex binder and the co-solvent, and by combining with an organic solvent and using a sublimable dye, a printed matter with brighter colors can be obtained, and the color is stable and difficult to decolorize.

[0029] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A printing method for playing cards that combines intaglio printing and flexographic printing, characterized in that, Including the following steps: S1: Ink preparation: Prepare chlorinated polypropylene resin, chlorinated polyolefin, organic solvent, biocide, latex binder, crosslinking agent, cosolvent, curing agent, and disperse dye; S2: Heating process: Coat the ink on the recording medium and heat it to allow the disperse dye to diffuse and develop color in the particles of the latex binder and cosolvent; S3: Adjust pressure: Select a doctor blade with a suitable size based on the printing machine, adjust the pressure applied by the doctor blade on the plate cylinder according to the printing speed, and set the angle between the doctor blade and the plate between 65° and 70°, and set the pressure of the impression cylinder based on the material of the substrate. 2.S4: Imprinting: Transfer the ink in the ink trough to the plate cylinder using an ink transfer device, and then scrape off the ink on other parts of the plate cylinder except for the recessed parts with a doctor blade; transfer the ink in the recessed parts to the substrate through the impression cylinder, and the screen ruling on the plate cylinder is 88 - 100 lines.

3. The gravure and flexography combined playing card printing method according to claim 1, wherein, The disperse pigment includes a dispersant crosslinked around the pigment, and the disperse pigment includes a carboxyl-functional dispersant crosslinked around the pigment core through a crosslinking agent having at least two groups.

4. The gravure-flexography combined playing card printing method according to claim 2, wherein, The organic solvent has a solubility parameter greater than 27.5 at 25°C.

5. The gravure-flexography combined playing card printing method according to claim 3, characterized in that, The ratio of the chlorinated polypropylene resin, chlorinated polyolefin, organic solvent, biocide, latex binder, cosolvent, curing agent, and disperse dye is 1:2:2:3:0.8:1:3:

2.

6. The gravure-flexography combined playing card printing method according to claim 4, characterized in that, The polymeric latex binder includes the following mixtures: acrylic latex binder and polyurethane latex binder; acrylic latex binder and polyester latex binder; polyester latex binder and polyurethane latex binder; or acrylic latex binder, polyester latex binder, and polyurethane latex binder.

7. The gravure and flexography combined playing card printing method according to claim 5, characterized in that The average particle size of the pigment particles is above 120 nm and below 350 nm.

8. The gravure and flexography combined playing card printing method according to claim 1, characterized in that, The crosslinking agent is an epoxy-based crosslinking agent.

9. The gravure-flexo combined playing card printing method according to claim 1, characterized in that The curing agent is vinyltriamine DETA and aminoethylpiperazine AE, which has a solubility parameter less than 27.5 at 25°C.