CN113103740A

CN113103740A - Novel hot stamping line manufacturing method

Info

Publication number: CN113103740A
Application number: CN202110393359.XA
Authority: CN
Inventors: 张永伟; 文杰; 李忠义; 郑晓波
Original assignee: Yunnan Qiaotong Package Printing Co ltd
Current assignee: Yunnan Qiaotong Package Printing Co ltd
Priority date: 2021-04-13
Filing date: 2021-04-13
Publication date: 2021-07-13

Abstract

The invention relates to a manufacturing method of a novel hot stamping line, which comprises the following steps: (1) preparing a silk screen plate; (2) screen printing; (3) primary curing; (4) adjusting the round-to-round printing; (5) carrying out hot stamping; (6) and (5) secondary curing. The novel process is a new discovery, the obtained printing effect is superior to that of the traditional technical scheme, the use efficiency of the screen printing machine is greatly improved on the basis of the same line thickness, the anti-counterfeiting performance of the package, the decoration performance of the package and the visual impact force are greatly improved, and the novel process has a great guiding effect on the development and exploration of the package printing process. The line made is thinner than the line of traditional thermoprint, the thermoprint line of the invention can reach the thickness of 0.41MM, reduce the cost of making the gilding edition, make one gilding edition cycle of tradition generally 3 days, need see pattern simplicity on the edition, save the time of changing the edition, can change the silk screen plate fast.

Description

Novel hot stamping line manufacturing method

Technical Field

The invention belongs to the technical field of hot stamping, and particularly relates to a manufacturing method of a novel hot stamping line.

Background

At present, the traditional gold stamping (hot stamping) method can also be used for hot stamping lines, but the traditional hot stamping technology designs patterns on a template, combines the characteristics of paper and carves a gold stamping plate, and has the defects of high plate making difficulty, great plate waste and high cost for products with large breadth and far hot stamping line positions.

The lines of the traditional gold stamping plate are completely transferred, padding is needed (the lines are thinner, padding is also difficult, and padding time is longer), the printing process is more complicated, the anti-counterfeiting performance is weak, the anti-counterfeiting requirement of a special effect cannot be met, and the gold stamping plate is easily copied (gold stamping).

Disclosure of Invention

Aiming at the problems, the invention provides a new process route which is different from the traditional hot stamping process, has simple process and novel hot stamping line effect.

The specific technical scheme is as follows:

a manufacturing method of a novel hot stamping line comprises the following steps:

(1) preparing a screen printing plate: the method comprises the steps of adopting a 350-mesh silk screen plate, respectively coating 8 layers of photosensitive glue on the front surface and the back surface of the silk screen plate to form a photosensitive plate film, pasting a positive negative film on the photosensitive plate film for printing, and then exposing, developing and washing by ultraviolet rays.

(2) Screen printing: and (4) mounting the prepared screen printing plate on a screen printing machine, and then controlling the screen printing machine to print screen UV ink on the paper substrate.

(3) Primary curing: and (3) conveying the paper substrate printed with the wet silk screen UV ink into a UV drying tunnel I for primary curing, wherein the UV energy of the UV drying tunnel I is controlled to be 150 MJ.

(4) Adjusting the round-to-round printing: the interval distance between an upper rolling cylinder and a lower rolling cylinder which are vertically combined and have the circumferential diameter of 50CM in a circular pressing circular printing machine is 20CM, the transfer printing speed of the upper rolling cylinder and the lower rolling cylinder is controlled to be 1-25 m/s, and the hot stamping temperature of the upper rolling cylinder is controlled to be 90-120 ℃.

(5) And (3) carrying out hot stamping, namely feeding the paper substrate solidified in the step (3) and the hot stamping material on the conveying roller into a circular stamping machine for hot stamping transfer to obtain lines with a hot stamping effect, wherein the thickness of the hot stamping material is controlled to be 16 microns.

(6) Secondary curing: and (4) carrying out secondary curing on the pattern on the printed matter substrate by using a UV lamp of a UV drying tunnel II, wherein the UV energy of the UV drying tunnel II needs to be controlled at 150 MJ.

The method comprises the steps of making a file before printing, namely printing a gold stamping pattern on a computer, then preparing a screen printing plate, making the pattern to be gold stamped on the computer on the screen printing plate, adjusting line thickness (the thinnest line can reach 0.06 MM), coating photosensitive glue on the stretched screen printing plate, respectively coating 8 layers (16 layers in total) of photosensitive glue on the front surface and the back surface to control the thickness of the photosensitive glue, forming a photosensitive plate film, pasting a positive image negative on the plate film, printing the plate, exposing, developing and washing (the lines are transparent), and obtaining the screen printing plate used by a screen printing machine.

After the ink discharge amount is controlled by the mesh number, the screen image-text part on the screen plate is not irradiated by light, the photosensitive film is soluble in water, and the screen lines on the screen plate form a transparent part after being washed.

And (3) mounting the obtained screen printing plate on a semi-automatic or full-automatic screen printing machine, and printing UV ink on a printing stock (paper substrate) by adopting a screen printing mode.

The UV energy of the UV drying channel I and the UV drying channel II needs to be controlled at 150MJ, the printing effect is not influenced too much at about 150MJ, but the difference is not large, and the printing ink is easy to flower because the quantity of the UV drying channel I is lower than 150MJ, and the ink is not dried after being cured; the UV energy is higher than 150MJ, so that the hot stamping and the flower formation are easy. The UV energy needs to be controlled and adjusted by a UV energy instrument.

8 layers (16 layers in total) of photosensitive resist are respectively coated on the front surface and the back surface of the silk screen plate so as to ensure the ink discharging amount and the convex feeling and the hot stamping property of lines.

The distance between the roller and the lower roller is 20CM, because 120g-370g of printing paper is generally used. The paper pressure of more than 20CM and 120g is unstable, and the problems of blooming, incomplete printing and the like are caused by hot stamping; below 20CM, the 370g sheet pressure becomes high and the sheet distortion becomes severe producing full lines.

The hot stamping temperature is between 90 ℃ and 120 ℃, the temperature resistance of the alumite is realized, the temperature is too high, the hot stamping material (such as the alumite) deforms, and the paper deforms; the temperature is between 90 ℃ and 120 ℃, so that hot stamping defects such as powder falling, wrinkling and the like of the alumite can be effectively avoided.

The stamping material must have sufficient transfer and peeling effects, and in order to ensure that the material must have sufficient transfer and peeling forces, the thickness of the stamping material must be 16 um. Because if the thickness is larger than 16um, the material is too thick to be completely stripped by the hot stamping material (such as an alumite glue layer), and the color layer transfer is incomplete; and less than 16um, the hot stamping material (such as alumite) has better adhesion and is easy to fall off, and the phenomena of pattern generation and the like are caused.

Further, the tension of the screen cloth and the screen frame is 30N when the silk screen plate is stretched in the step (1). The tension is high, which is beneficial to printing more precise lines.

Further, the screen printer in the step (2) is a semi-automatic or full-automatic screen printer.

Further, the hot stamping materials on the conveying roller in the step (5) are hot stamping electric aluminum, cold stamping electric aluminum and a heat transfer film.

The manufacturing method comprises the steps of printing silk screen UV ink on a paper substrate by using a screen printer, then, installing a conveying roller on a circular pressing mechanical platform device to convey hot stamping electrochemical aluminum, controlling the temperature, the pressure and the machine speed of the circular pressing mechanical device and the energy (150 MJ) of a silk screen UV drying tunnel, carrying out hot stamping transfer on UV lines on a printed matter substrate to obtain lines with hot stamping (gold stamping) effects, and obtaining products with a plurality of hot stamping (gold stamping) line colors according to hot stamping materials with different colors.

And the thermoprinting pressure is 3P, so that the thermoprinting material is completely transferred and peeled to the paper printed with the UV printing ink, and a thermoprinting line product is obtained.

The invention also aims to provide equipment suitable for the novel hot stamping line manufacturing method, which comprises a screen printing machine for printing and outputting screen UV ink on a paper substrate, a UV drying channel I and a UV drying channel II for curing treatment, and a circular press circular printing machine for hot stamping, wherein the mesh number of a screen printing plate arranged on the screen printing machine is 350 meshes, 8 layers of photosensitive glue are respectively coated on the front and back surfaces of the screen printing plate, the paper substrate enters the UV drying channel I for primary curing after being printed and output with the screen UV ink by the screen printing machine, the outlet of the UV drying channel I is butted with the inlet of the circular press circular printing machine, the circular press circular printing machine comprises an upper rolling cylinder and a lower rolling cylinder which are vertically butted and have the circumferential diameters of 50cm, and the interval distance between the upper rolling cylinder and the lower rolling cylinder is 20 cm;

the device also comprises a conveying roller for outputting the hot stamping material and a UV drying tunnel II which is butted with the outlet of the circular pressing circular printing machine and used for secondary curing.

The conveying roller is additionally arranged at the top of the round-pressing round printing machine.

The invention has the beneficial effects that: the novel process is a new discovery, the obtained printing effect is superior to that of the traditional technical scheme, the use efficiency of the screen printing machine is greatly improved on the basis of the same line thickness, the anti-counterfeiting performance of the package, the decoration performance of the package and the visual impact force are greatly improved, and the novel process has a great guiding effect on the development and exploration of the package printing process.

The line made by the invention is thinner than the traditional hot line (the thinnest is 0.06 MM), and the traditional hot line is about 12 MM.

The hot stamping line can reach the thickness of 0.41MM (the thickness is convexity in the printing field, the traditional hot stamping line can only realize flat stamping and does not have the thickness), and the traditional hot stamping easily damages paper fibers (the pressure is too large, and the line easily penetrates from the front surface to the back surface of the paper).

The cost of manufacturing the gold stamping plate is reduced, the period of manufacturing one gold stamping plate is generally 3 days, the simplicity of looking at patterns on the plate is required, the plate changing time is saved, and the silk screen plate can be quickly replaced.

The patterns manufactured by the novel hot stamping lines have decorative and visual impact force, and the authenticity identification function is enhanced.

Drawings

FIG. 1 is a schematic view of the composition of process equipment in example 1 of the present invention.

FIG. 2 is a schematic view of the upper and lower rollers of the present invention, the transport roller transporting the stamping material.

FIG. 3 is a schematic diagram of the screen printing plate after the photoresist is scraped.

FIG. 4 is a schematic view of the screen printing plate of the present invention for applying photoresist.

Fig. 5 is a new hot stamping line product diagram of embodiment 2 of the invention.

Fig. 6 is a new hot stamping line product diagram of embodiment 3 of the invention.

Figure 7 is a diagram of the new hot stamped line product of comparative example 1 of the present invention.

Figure 8 is a diagram of the new hot stamped line product of comparative example 2 of the present invention.

Figure 9 is a diagram of the new hot stamped line product of comparative example 3 of the present invention.

Figure 10 is a diagram of the new hot stamped line product of comparative example 4 of the present invention.

Figure 11 is a diagram of the new hot stamped line product of comparative example 5 of the present invention.

In the upper diagram: 1-a screen printing machine, 101-a screen printing plate, 201-a UV drying channel I, 202-a UV drying channel II, 3-a circular press printing machine, 301-an upper rolling cylinder, 302-a lower rolling cylinder and 303-a conveying roller; 100-paper substrate, 200-hot stamping material.

Detailed Description

In order to make the technical problems and technical solutions solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1:

as shown in fig. 1 and 2, an apparatus suitable for the manufacturing method of the novel hot stamping line includes a screen printer 1 for printing and outputting screen UV ink on a paper substrate 100, a UV drying tunnel i 201 and a UV drying tunnel ii 202 for performing curing treatment, and a circular press circular printer 3 for hot stamping, wherein the mesh number of a screen plate 101 installed on the screen printer 1 is 350 meshes, the front and back surfaces of the screen plate 101 are respectively coated with 8 layers of photosensitive resist, the paper substrate 100 enters the UV drying tunnel i 201 for primary curing after printing and outputting the screen UV ink by the screen printer 1, an outlet of the UV drying tunnel i 201 is butted with an inlet of the circular press circular printer 3, the circular press circular printer 3 includes an upper rolling cylinder 301 and a lower rolling cylinder 302 which are vertically butted up and down and have a circumferential diameter of 50cm, and a distance between the upper rolling cylinder 301 and the lower rolling cylinder 302 is 20 cm;

the device also comprises a conveying roller 303 for outputting the hot stamping material and a UV drying tunnel II 202 which is butted with the outlet of the circular stamping machine 3 and used for secondary curing.

The conveying roller 303 is additionally arranged at the top of the round-pressing printing machine 3.

Example 2:

the method for manufacturing the novel hot stamping line disclosed by the invention is used for printing the hot stamping line in a certain cigarette packaging soft box, and comprises the following steps:

(1) preparing a screen printing plate: preparing a file before printing, namely printing a gold stamping pattern on a computer, then preparing a screen printing plate, preparing the pattern to be gold stamped on the computer on the screen printing plate, adjusting line thickness, adopting the screen printing plate 101 with 350 meshes, respectively coating 8 layers (16 layers in total) of photosensitive glue on the front and back surfaces of the screen printing plate 101 as shown in figures 3 and 4 to form a photosensitive plate film, pasting a positive negative film on the photosensitive plate film for printing, and then exposing, developing and washing by ultraviolet rays; when the silk screen plate 101 is stretched, the tension of the screen cloth and the screen frame is 30N.

(2) Screen printing: as shown in fig. 1, the prepared screen printing plate 101 is installed on a fully automatic screen printer 1, and then the screen printer 1 is controlled to print screen UV ink on a paper substrate 100; the paper substrate 100 is 250 g.

(3) Primary curing: the paper substrate 100 printed with the wet silk screen UV ink is conveyed into a UV drying tunnel I201 to be cured for the first time, and the UV energy of the UV drying tunnel I201 needs to be controlled at 150 MJ.

(4) Adjusting the round-to-round printing: the interval distance between an upper rolling cylinder 301 and a lower rolling cylinder 302 vertically combined up and down with the circumferential diameter of 50CM in a circular pressing circular printing machine 3 is 20CM, the transfer printing speed of the upper rolling cylinder 301 and the lower rolling cylinder 302 is controlled to be 25m/s, the hot stamping temperature of the upper rolling cylinder 301 is controlled to be 120 ℃,

(5) and (3) hot stamping, namely, as shown in fig. 2, feeding the paper substrate 100 solidified in the step (3) and the hot stamping aluminums on the conveying roller 303 into a circular stamping circular printing machine 3 for hot stamping transfer to obtain lines with a hot stamping effect, wherein the thickness of the hot stamping aluminums needs to be controlled to be 16 microns.

(6) Secondary curing: the pattern on the printed substrate was cured twice by UV lamps in the UV tunnel ii 202, and the UV energy in the UV tunnel ii 202 was controlled at 150 MJ. And finally carrying out adhesive force curing.

The obtained pattern has decorative and visual impact force, and the gold stamping printing is performed on a certain cigarette packaging soft box product as shown in figure 5.

Example 3:

(4) Adjusting the round-to-round printing: the interval distance between an upper rolling cylinder 301 and a lower rolling cylinder 302 vertically combined up and down with the circumferential diameter of 50CM in the circular press circular printer 3 is 20CM, the transfer printing speed of the upper rolling cylinder 301 and the lower rolling cylinder 302 is controlled to be 1m/s, and the hot stamping temperature of the upper rolling cylinder 301 is controlled to be 90 ℃.

The obtained pattern has decorative and visual impact force, and the gold stamping printing is performed on a certain cigarette packaging soft box product as shown in figure 6.

Comparative example 1:

as shown in fig. 7, in the comparative embodiment, the manufacturing method of the novel hot stamping line disclosed by the present invention is still used for printing the hot stamping line in a certain soft cigarette packaging box, and the differences from the embodiments 2 and 3 are as follows:

and (5) controlling the thickness of the hot stamping electric aluminum in the hot stamping to be 20 um.

Because the thickness is larger than 16um, the material is too thick to be beneficial to the complete stripping of the hot stamping material (such as an alumite glue layer), the color layer transfer is incomplete, and the cigarette packaging soft box product is shown in figure 7.

Comparative example 2:

as shown in fig. 8, in the present comparative embodiment, the manufacturing method of the novel hot stamping line disclosed by the present invention is still used for printing the hot stamping line in a certain soft cigarette packaging box, and the differences from the embodiments 2 and 3 are as follows:

and (5) controlling the thickness of the hot stamping alumite in the hot stamping to be 14 um.

Because the thickness is less than 16um, the hot stamping material (such as alumite) is better attached and is easy to fall off, the phenomena of flower pattern and the like are generated, and the soft box product packaged by the cigarette is shown in figure 8 (wherein the part is marked by a ring).

Comparative example 3:

as shown in fig. 9, the difference between the embodiment 2 and the embodiment 3 is that the gold stamping lines in the soft cigarette packing box are printed by using the manufacturing method of the novel hot stamping lines disclosed by the present invention in the comparison embodiment:

the paper substrate 100 is 120 g.

In the adjustment of the circular pressing circular printing in the step (4), the interval distance between the upper rolling cylinder 301 and the lower rolling cylinder 302 which are vertically involuted and have the circumferential diameter of 50CM in the circular pressing circular printing machine 3 is 24 CM.

Because the paper pressure of more than 20CM and 120g is unstable, the problems of blooming, deformity and the like are caused by hot stamping, and the cigarette packaging soft box product is shown in figure 9.

Comparative example 4:

as shown in fig. 10, the difference between the embodiment 2 and the embodiment 3 is that the gold stamping lines in the soft cigarette packing box are printed by using the manufacturing method of the novel hot stamping lines disclosed by the present invention in the comparison embodiment:

the paper substrate 100 is 370 g.

In the adjustment of the circular pressing circular printing in the step (4), the interval distance between the upper rolling cylinder 301 and the lower rolling cylinder 302 which are vertically involuted and have the circumferential diameter of 50CM in the circular pressing circular printing machine 3 is 18 CM.

Since the paper pressure of 370g becomes large and the paper deformation becomes severe to produce full lines less than 20CM, the cigarette packing soft case product is shown in fig. 10.

Comparative example 5:

as shown in fig. 11, the difference between the embodiment 2 and the embodiment 3 is that the gold stamping lines in the soft cigarette packing box are printed by using the method for manufacturing the novel hot stamping lines disclosed by the present invention in the comparison embodiment:

and (6) secondary curing: the pattern on the printed substrate was cured twice by UV lamps in the UV tunnel ii 202, and the UV energy in the UV tunnel ii 202 was controlled at 130 MJ.

Because the UV drying tunnel I201 amount is less than 150MJ, the ink is cured and does not dry, and is easy to flower, as shown by the circled part with a pen on the left side in FIG. 11.

The present invention has been described in detail with reference to the specific and preferred embodiments, but it should be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and any modifications, equivalents and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.

Claims

1. A manufacturing method of a novel hot stamping line is characterized by comprising the following steps:

preparing a screen printing plate: adopting a silk screen plate (101) with 350 meshes, respectively coating 8 layers of photosensitive glue on the front surface and the back surface of the silk screen plate (101) to form a photosensitive plate film, pasting a positive negative film on the photosensitive plate film for printing, and then exposing, developing and washing by ultraviolet rays;

screen printing: installing the prepared silk screen plate (101) on a screen printing machine (1), and then controlling the screen printing machine (1) to print screen UV ink on a paper substrate (100);

primary curing: feeding the paper substrate (100) printed with the wet silk screen UV ink into a UV drying channel I (201) for primary curing, wherein the UV energy of the UV drying channel I (201) needs to be controlled at 150 MJ;

adjusting the round-to-round printing: the method comprises the following steps of (1) controlling the transfer printing speed of an upper rolling cylinder (301) and a lower rolling cylinder (302) to be 1-25 m/s and controlling the hot stamping temperature of the upper rolling cylinder (301) to be 90-120 ℃ by setting the interval distance between the upper rolling cylinder (301) and the lower rolling cylinder (302) which are vertically combined and have the circumferential diameter of 50CM in a circular round press printing machine (3);

carrying out hot stamping, namely feeding the paper substrate (100) solidified in the step (3) and hot stamping materials on a conveying roller (303) into a circular stamping circular printing machine (3) together for hot stamping transfer to obtain lines with a hot stamping effect, wherein the thickness of the hot stamping materials must be controlled to be 16 mu m;

secondary curing: the pattern on the printed substrate was cured twice by UV lamps in the UV tunnel ii (202), and the UV energy in the UV tunnel ii (202) was controlled at 150 MJ.

2. The manufacturing method of the novel hot stamping line as claimed in claim 1, characterized in that: and (2) in the step (1), the tension of the screen cloth and the screen frame is 30N when the silk screen plate (101) is stretched.

3. The manufacturing method of the novel hot stamping line as claimed in claim 1 or 2, wherein the manufacturing method comprises the following steps: and (3) the screen printer (1) in the step (2) is a semi-automatic or full-automatic screen printer.

4. The manufacturing method of the novel hot stamping line as claimed in claim 1, characterized in that: and (5) hot stamping materials on the conveying roller (303) are hot stamping electric aluminum, cold stamping electric aluminum and a heat transfer film.