KR102430888B1 - The inline offsey cold foil printing method - Google Patents

Abstract

The present invention relates to a printing method and, more specifically, to an inline offset cold foil stamping method for performing printing through a printing unit from a material supply unit. For solving the task of the present invention, the present invention provides an inline offset cold foil stamping method comprising: receiving a stencil paper from the material supply unit to allow a glue printing unit having a glue roller, a dampening unit, and a blanket to perform glue printing; allowing a foil transcription unit having a cold foil module, an unwinding unit, a blanket, and a high-pressure cylinder to transcribe the foil; and allowing a printing unit to perform printing, a coating unit to perform coating, and a delivery unit to perform UV transcription. The temperature of the glue roller in the glue printing unit is maintained by increasing the temperature of an ink roller during ink printing by 15% to 35%. The amount of dampening solution of the dampening unit of the glue printing unit is set to be 40% to 60% of the amount of dampening solution during ink printing. The hardness (N/cm^2) of the used blanket is 50 to 100. In addition, it is desirable that a gap between the blanket and the high-pressure cylinder in the cold foil transcription unit is set between 0.200 and 0.300 mm during ink printing. It is also desirable that the tension (N/cm) of the unwinding unit is set to 0.90 to 1.10 in the cold foil module of the foil transcription unit and that the tension (N/cm) of a rewinding unit is set to 1.40 to 1.60. The present invention can reduce printing costs.

Description

INLINE OFFSEY COLD FOIL PRINTING METHOD

The present invention relates to an inline offset cold foil stamping printing method, and more particularly, to an inline offset cold foil stamping printing method for efficiently transferring a foil at the same time as printing inline through an offset printing machine equipped with a cold foil module it's about

Offset printing is a general printing method in which an ink image is transferred from a plate to a rubber blanket and then transferred to the surface of a substrate.

Offset printing as described above is a printing method developed using the property of water and oil to repel each other, and by supplying damp water through a damp roller to the printing plate surface mounted on the plate barrel, the non-caustic line of the printing plate is damped on the wet layer. This is a printing method that enables ink images to be created by selectively depositing ink on the caustic part when ink is supplied through an ink roller because ink is not attached.

As described above, the ink image is transferred to the blanket while the printing plate on which the ink is seated rotates, and the ink image is transferred and printed on the base paper as the base paper passes between the blanket and the pressure tube to which the ink image is transferred.

The printing method as described above is generally performed in the order of substrate supply, ink printing, and coating.

On the other hand, cold foil is a foil that is transferred to an adherend by using glue instead of heat and high pressure during transfer, unlike hot stamping foil, and is offline (Off-line). ), it is a foil that is very helpful in improving productivity because it transfers in-line at the same time as printing on a printing machine equipped with a cold foil module.

Cold foils as described above can be produced at a printing speed, and work is simpler and more efficient than hot foils, and short and long runs can be performed, and the skill of the operator is less. As it has many advantages such as reduction of development cost, etc., it is widely used in various sales industries.

However, although it has many advantages as described above, a precise and effective printing method has not been developed in cold foil printing, so additional technology development and introduction of an actual product production process are required.

Developed for the above needs, it is a printing method of paper processed by a cold foil stamping method in which the base paper and the metal foil are laminated integrally by placing an adhesive at the position where the metal foil is to be transferred from the foil to the base paper. There is a known printing method in which a printing plate and color printing plates are installed in an offset printing machine in advance, an adhesive is applied while supplying a base paper, and then a metal foil is transferred and pressed and then color is printed by passing the printing plates. This is a completely different printing method.

On the other hand, Patent Publication No. 10-2010-0128674 discloses a cold stamping sheet using an ultraviolet curing adhesive and a method for manufacturing the same. It is an invention completely different from the printing method of the present invention as it relates to a method for manufacturing a cold stamping sheet in which an adhesive is attached, a foil is pressed, and a non-adhesive foil is removed after irradiating it with ultraviolet rays.

Republic of Korea Patent Publication 10-2010-0128674 (2010. 12. 08).

In the present invention, in printing a cold foil having many advantages as described above, cracks, foil separation, paper separation, resolution that may occur when transferring the foil to printing paper using an offset printing machine equipped with a cold foil module By providing an inline offset cold foil stamping printing method that minimizes problems such as deterioration, reduces costs through indexing function, and maximizes the life and working time of the foil roll to introduce cold foil into the actual product production process. There is a purpose.

The present invention in order to solve the problems of the present invention as described above;

The base paper is supplied from the substrate supply unit, and the glue printing unit is equipped with a glue roller, a wet water unit, and a blanket; After transferring the foil in the cold foil module, the unwinding unit, and the blanket and the tender foil transfer unit; Provided is an inline offset cold foil stamping printing method comprising printing in a printing unit and UV transfer in a discharging unit after coating in the coating unit.

The temperature of the glue roller in the glue printing part is maintained by increasing 15 to 35% of the ink roller temperature during ink printing, and the wet water amount of the wet water part of the glue printing part is 40% to 60% of the wet water amount during ink printing, The blanket used provides a cold foil printing method using a hardness (N/cm ² ) of 50 to 100.

In addition, the interval between the blanket and the pressure tube in the cold foil transfer part is preferably 0.200 to 0.300 mm when printing ink.

In the cold foil module of the foil transfer unit, the tension (N/cm) of the unwinder unit is 0.90 to 1.10, and the tension (N/cm) of the rewinding unit is preferably 1.40 to 1.60.

According to the present invention, it is possible to reduce the printing cost through the indexing function by installing the cold foil transfer unit, and to print the cold foil by maximizing the life and working time of the foil roll. It is possible to provide an inline offset cold foil stamping printing method that can easily, easily, and efficiently print cold foil by quantifying the

1 is a schematic diagram of an apparatus for carrying out the method of the present invention;
Figure 2 is a detailed view of the glue printing unit.
2A to 2D are diagrams of a transfer state of the printing unit of FIG. 2 .
3 is a detailed view of the foil transfer unit.
3A is a detailed view of the cold foil module of the foil transfer unit.
3B to 3D are diagrams of a transfer state of the foil transfer unit of FIG. 3 .
4 is a detailed view of the printing unit.
5 is a detailed view of the coating part.
6 is a detailed view of the discharge unit.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

The following description is provided to help the understanding and practice of the present invention, but is not intended to limit the present invention thereto.

Those of ordinary skill in the art to which the present invention pertains will understand that various modifications, changes or modifications can be made within the spirit of the present invention as set forth in the claims below.

In describing the present invention in detail, a detailed description of the technical configuration and the method of using the same, which are known to be predictable by those skilled in the art, will be omitted.

Also, in the present invention, glue and ink may be mixed and described.

First, Figure 1 is a printing apparatus 10 for carrying out the printing method of the present invention, the substrate supply unit 100, the glue printing unit 200, the cold foil transfer unit 300, the printing unit (400 ~ 400-5) and a coating unit 500 and a discharging unit 600 .

In the printing apparatus 10 configured as described above, when the substrate G is supplied from the substrate supply unit 100 , the ink image is transferred and printed on the substrate G in the glue printing unit 200 .

In describing the present invention in detail, first, a method according to the present invention in the glue printing unit 200 will be described.

2 is a detailed view of the glue printing unit 200, the substrate (G) is supplied in the direction of the arrow, and the supplied substrate is passed through the glue printing unit (200).

In the glue printing unit 200 of FIG. 2 , the wet water 221 is supplied to the surface of the printing plate 211 mounted on the plate tube 210 through the damping roller 220 to the non-caustic portion 261 of the printing plate 211; FIG. 2A . ), the glue does not adhere to the non-caustic part 261 wetted with the damp water 221, so the glue 231 is supplied through the glue roller 230, and the glue 231 is selectively seated on the caustic part 260 to make the glue 231. An image is created (see Figs. 2a and 2b).

In the above, the printing plate 211 on which the glue 231 is seated rotates in the direction of the arrow to transfer the glue image to the blanket 240, and the substrate (G) is between the blanket 240 and the pressure tube 250 to which the glue image is transferred. As it passes, the glue image is transferred to the substrate (G) and printed.

from above. According to the present invention, the glue 231 supplied through the glue roller 230 has a relatively high viscosity compared to ink, so it is higher than the roller temperature of 26 to 27 ° C, which is usually used in ink printing, to increase the roller temperature by 15 to 35%. When the temperature of the glue roller 230 is lower than 31° C., the glue 231 is easy to harden, and the substrate separation phenomenon occurs due to agglomeration. Occurs. On the other hand, when the temperature is higher than 35° C., the adhesiveness of the glue 231 is lowered, and the temperature of the glue roller 230 is raised to work because background contamination occurs due to excessive emulsification.

The above temperature range was confirmed through an experiment, and Table 1 below shows the experimental results.

As described above, the glue makeup transition in the glue printing unit 200 is explained with FIGS. 2A to 2C,

When the glue image is transferred in the glue printing unit 200, water and oil are alternated by making the caustics part 260 (FIG. It is a form of transferring the glue 231 from the printing plate 211 to the blanket 240 by using the property of repulsing water and oil (see FIG. 2c ).

Therefore, when the glue 231 is transferred, wet water 221 is required, and the amount of wet water required to transfer the glue 231 is reduced to 40% to 60% of the amount of wet water during general ink printing. It is preferable to use the UV-type glue 231 for inline offset cold foil stamping printing, because it is very sensitive to the damp water 221 compared to ink and is easily emulsified. Therefore, in the present invention, the amount of wet water is 20% to 30%. If the amount of wet water is 19% or less, print contamination of the caustics part and print resolution decrease occurs. It works by reducing the quantity relatively.

Experiments to optimize the amount of wet water are shown in Table 2 below.

The blanket 240 in the glue printing unit 200 in the present invention serves to print the image transferred from the printing plate 211 to the substrate G (see FIG. 2D ).

In the above, there are various types of blanket 240 according to hardness and surface. In the present invention, a special blanket for UV exclusive use is used when working with cold foil.

This is because, compared to other types of blanket 240, the hardness is high and the surface viscosity is low, so it is possible to reduce problems such as glue caustics detachment and paper detachment that may occur when the glue 231 is printed.

Table 3 below is a test table for the hardness of the blanket 240 to be used in the present invention. According to the table below, the blanket 240 in the present invention has a hardness (N/cm ² ) of 50-100.

3 is a detailed view of the foil transfer unit 300, a view of performing a method in which the cold foil is transferred to the glue printed portion (D) in the glue printing unit 200.

In FIG. 3 , the foil 320 is supplied through the cold foil module 310 to the upper surface of the part D on which the glue is printed, and then it is compressed and transferred (see FIG. 3c ).

In the above, the cold foil module 310 serves to supply the foil 320 in the form of being mounted on the offset printing machine unit, and enables cost reduction through the indexing function. By allowing only the foil to pass through the machine and not to operate when not needed, it is possible to maximize the life and service life of the foil roll.

Referring to FIG. 3A , in the above, the cold foil module 310 supplies and retrieves the foil 320 in the order of the unwinding unit 350 - the roller - the blanket 332 - the roller - the rewinding unit 360 . At this time, the tension (N/cm) of the unwinding unit 350 is 0.90 to 1.10, and the tension (N/cm) of the rewinding unit 360 is 1.40 to 1.60 (see FIG. 3A ).

When the value is lower than the tension (N/cm) range, a wrinkle phenomenon occurs during the transfer of the foil 320, and when the value is high, horizontal cracks and fractures occur.

Experiments to optimize the tension (N/cm) are shown in Table 4 below.

In the above, the foil 320 is composed of a base film-release layer-colored layer-deposition layer-adhesive layer, and by pressing the foil 320 on the glue printed upper surface (D), the colored layer-deposition layer-adhesive layer is separated from the release layer. and transcribed (see FIGS. 3b and 3c).

In the present invention, when transferring in the foil transfer unit 300, the interval (pressure) between the blanket 332 and the pressure tube 340 increases by 200% to 300% of 0.100mm, which is a normal ink printing interval, to 0.200 to 0.300. mm, but if the spacing is 0.200mm or less, the foil is not completely transferred, and glossiness is reduced, the foil is separated, and wrinkles appear.

In the above, the mechanical limit value of the gap is 0.300 mm, and the pressure value may vary depending on the type, thickness, and hardness of the substrate (G). In this case, a packing paper 331 is added between the blanket barrel 330 and the blanket 332. to adjust the spacing (see FIG. 3D ).

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4 is for the printing unit 400 to 400-5 in the present invention, after transferring the ink 421 image on the printing plate 411 surface mounted on the offset printing substrate cylinder 410 to the blanket 431 Printing on the substrate (G) is shown, and at this time, the ink roller 420 operates at a standard temperature of 26 to 27°C.

In addition, the wet water 440 makes the caustic part lipophilic and the non-caustic part hydrophilic without a clear difference in height on the surface of the printing plate 411 , and water and oil (oil-soluble ink) are alternately given to use the property of repulsing water and oil. Thus, the ink 421 is transferred from the printing plate 411 to the blanket 431 . At this point, moisture is needed.

In the above ink transfer, the wet water 440 is performed at a standard value of 50 to 60%, which is the amount of wet water required to transfer the ink 421 .

The blanket 431 in the printing unit 400 to 400-5 uses a UV/general combined blanket, works with a printing pressure of 0.100 mm, and the packing paper 430 uses 0.04 mm, which is used when necessary. .

Here, the ink-type coating may be used in the same manner as the ink 421 .

5 is to explain the coating unit 500 of the present invention, the coating serves to give a decoration effect such as matte, glossy, etched, soft, and to prevent color change and scratch of the printed matter.

Referring to FIG. 5 , after supplying the coating solution 530 to the chamber 510 through the duct 520 , the abutting anilux roller 540 rotates to transfer the coating solution 530 .

As the anilux roller 540 and the plate tube 551 rotate the transferred coating solution 530 in the above, the resin/rubber plate 550 mounted on the plate tube 551 is transferred, and the resin/rubber plate 550 and the pressure tube ( The coating solution 530 is printed while pressure is applied to the substrate (G) that passes while rotating 560).

Finally, Figure 6 is for explaining the discharge unit 600 in the present invention, by irradiating UV from the UV lamp 610 to the substrate (G) on which glue printing, foil attachment, ink printing and coating are completed, glue, ink and The coating is cured to finish the inline offset coldfoil stamping print.

As described above, by using the method of the present invention, inline offset cold foil stamping printing can be performed easily, easily and efficiently.

100: substrate supply unit 200: glue printing unit
210: printing plate 211: printing plate
220: damp roller 221: damp water
230: ink roller 231: glue
240: blanket 250: tenderness
G: Substrate D: Glue print part
260: caustic unit 261: non-caustic unit
300: cold foil transfer unit 310: cold foil module
320: foil 330: blanket barrel
331: packing paper 332: blanket
340: tender 350: unwinding unit
360: rewinding unit 400~400-5: printing unit
410: pantong 411: pan
420: ink roller 421: ink
430: packing paper 431: blanket
440: damp water 500: coating part
510: chamber 520: duct
530: coating solution 540: anillux roller
550: resin / rubber plate 551: pantong
560: tenderness 600: discharge unit
610: UV lamp

Claims (8)

The base paper is supplied from the substrate supply unit, and the glue printing unit is equipped with a glue roller, a wet water unit, and a blanket; After transferring the foil in the cold foil module, the unwinding unit, the rewinding unit, and the blanket and the tender foil transfer unit; An inline offset cold foil stamping printing method comprising printing in the printing unit and then UV irradiation in the medium after coating in the coating unit, wherein the temperature of the glue roller in the glue printing unit is maintained at 31 to 33 ° C. Offset cold foil stamping printing method.
delete The method of claim 1,
Inline offset cold foil stamping printing method, characterized in that using UV type glue in the glue printing unit.
The method of claim 1,
Inline offset cold foil stamping printing method, characterized in that the work is carried out with the amount of wet water in the soaking part of the glue printing part being 25-30%.
The method of claim 1,
In-line offset cold foil stamping printing method, characterized in that the blanket in the glue printing unit uses a hardness (N/cm ² ) of 70-100.
The method of claim 1,
Inline offset cold foil stamping printing method, characterized in that the cold foil module in the foil transfer unit is an indexing function.
7. The method of claim 6,
Inline offset cold foil, characterized in that the tension (N/cm) of the unwide unit of the cold foil module of the foil transfer unit is 0.90 to 1.10, and the tension (N/cm) of the rewinding unit is 1.40 to 1.60 Stamping printing method.
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