JP2001179936A - Turntable type uv multicolor printing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a turntable type UV multicolor printing equipment, with which the whole surface of a printed surface is uniformly cured by a method wherein converging type illuminators are employed as UV illuminators under a state that UV intensity is enlarged by setting the focal length of the illuminator smaller and UV irradiation is performed by translating either one of the UV illuminator and a printed matter in parallel to each other in order to print double or the like with special UV ink. SOLUTION: Along the peripheral part of the turntable 1, pallets 3, on each of which the printed matter 2 is placed for conveyance, are equipped equiangularly so as to intermittently turn the turntable every installation angle of the pallet. Above the turntable and at the positions corresponding to the pallets, the number, which corresponds to the number of printing colors, of presses 4 and of the UV irradiators 5 are arranged alternately. As the UV illuminator 10 of the UV irradiator, the converging type appliance 11 having a short focal length equipped with an UV lamp 12 is employed. At the same time, under the state that the focal point F of the UV of the UV illuminator is nearly brought in line with the printed surface 2a of the printed matter 2, the UV illuminator is translated parallel to the printed surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION A plurality of printing machines and UV irradiators are arranged alternately above a pallet provided at equal intervals on the circumference of a turntable, and printing is performed on various printed materials on the pallet and curing is performed by UV irradiation. In a turntable type multicolor printing device that repeats (drying) and performs multicolor printing, UV illumination of a UV irradiator to perform overprinting etc. using a recently developed special UV ink Using a condensing luminaire as a tool, and setting a small focal length to increase the UV intensity of the printing surface (ie, UV ink),
A turntable type UV multicolor printing apparatus characterized in that one of the UV illuminator and the printed material is translated at a set speed and irradiated with UV to cure the entire printing surface uniformly. I do.

[0002]

2. Description of the Related Art Conventionally, the printing surface (UV ink) of various printed materials (eg, various cards, disks, etc.) printed with UV ink (ultraviolet curable printing ink) (eg, printed with a screen printer) is subjected to UV. Irradiation (ultraviolet irradiation by a UV lamp) can cure in a very short time (several seconds) (a kind of dry curing by photochemical change) in a very short time compared to printing with a normal printing ink and drying by heating. It is widely used due to its high efficiency.

[0003] Further, since the curing of the printing surface requires only UV irradiation in seconds, it is suitable for a continuous multicolor printing method.
Number of print colors on a turntable that rotates at high speed (eg, 5
A turntable type multicolor printing apparatus is used in which a printing machine and a UV irradiator are alternately arranged to repeat printing and curing.

Conventional UV inks have excellent characteristics as described above, but have characteristics that are not suitable for overprinting (printing on the printed ink surface). In the case of printing (eg, 5 colors), for example,
Black, blue, white, green, and red are printed in the order of each other so that they do not overlap with other colors. Also, when printing on a specific material (eg, polycarbonate, etc.), However, there were drawbacks such as lack of peel strength and environmental durability and uneven printing.

On the other hand, recently, there has been a demand for printing of keys on a keyboard of a mobile phone (for example, made of polycarbonate), plates of an automobile speedometer and various meters, and other materials and overprints which cannot be handled by the conventional UV ink. Although the printing is rapidly increasing, these printings are still performed by a method of heating and drying for each one-color printing with a normal printing ink and the overprinting method. Number of color printing workers: 3 x 5 colors, total 1
Five people were required, and there were extremely inefficient and uneconomical issues such as printing time and labor costs.

[0006]

Therefore, if the above-mentioned conventional printing is performed by the turntable type UV multicolor printing apparatus, it is possible to continuously print five colors in units of seconds, and the number of workers is about two. It is obvious that the effect is much better.

Therefore, as a result of intensive research, UV inks have recently been developed that are capable of overprinting, have excellent peel strength after printing, environmental durability, and the like, and have characteristics that do not cause printing unevenness. And realized that the UV ink was used for printing in a conventional turntable type UV multicolor printing apparatus.

However, it has been found that the above-mentioned new UV ink cannot be used with a conventional (current) turntable type multicolor printing press. That is, when printing is performed using a conventional UV ink with the above-described printing machine, for example, a 3 kW, 120 w / cm UV lamp (tube) is set to a set area (eg, 60 × 60 m).
m) Installed on a semi-condensing type (parallel ray type) or diffuse type (diffuse reflection type) lighting equipment so that the entire surface of the printing surface is uniformly irradiated with UV, and the turntable that rotates intermittently is the position of the UV irradiator. UV light is applied evenly from the height of about 20 cm to the entire surface of the printing surface (light beam control by lighting equipment) when the light is temporarily stopped, and the amount of UV light required to cure the printing surface during the irradiation Is 250mj (millijoules)
And the UV intensity on the printing surface was about 200 mw (milliwatt), the irradiation time was about 2-3 seconds, and so on.

However, in the case of a new UV ink, if a UV lamp of 3 kw and 120 w / cm is used, the amount of UV light required for curing the printing surface is 500.
In the order of mj, especially the UV intensity of the printing surface at that time is 900
It was found that mw level was required, and in that state, strict conditions such as irradiation time of about 0 and 6 seconds were required.

It is impossible to satisfy the above conditions with the conventional UV irradiator of the conventional turntable type UV multicolor printing apparatus. In order to make the UV intensity about 900 mw, it is necessary to make the distance between the UV lamp and the printing surface much smaller (eg, about 50 mm). In such a case, the conventional semi-centralized type (FIG. It is impossible to illuminate the entire printing surface evenly with a lighting device of the diffusion type (FIG. 3, b) due to a slight difference in the horizontal distance from the center point 0 as apparent from FIG. It is clear from the fact that the UV intensity is reduced, and even more, the fact that the entire surface of the printing surface is evenly illuminated by the centralized luminaire (FIG. 2) was out of the question.

[0011]

Therefore, a change in the idea was attempted, and U
Conventionally, the most inappropriate centralized illuminating device is adopted as the irradiating device of the V irradiator, and if the focal length is made small (eg, about 50 mm), a large UV light is printed on the printing surface.
Intensity (eg, about 900 mw) has been reached in a linear state, and in this state, the printing surface or the UV illuminator is translated and irradiated at a speed that can cure the UV irradiation portion of the printing surface. (Scan), the required light amount (500
(mj-order) to solve the problem by developing that the entire printing surface can be cured uniformly.

[0012]

Means for Solving the Problems 1 That is, the present invention provides a turntable having a pallet for placing and transporting various plastic products and other printed matter at equal angles around the circumference of the turntable. The number of printing presses corresponding to the number of printing colors and U
V irradiators are alternately arranged, and the printed matter is placed on each pallet one after another by the supply means at the supply position of the turntable and transported. In the transport process, printing with the UV ink of each printer and each of the UV irradiators are performed. Turn table type multi-color with curing (a kind of drying) of the printing surface (UV ink) by UV irradiation, printing of a set number of colors, and discharging the cured printed material to the outside by the discharging means at the discharging position Pertaining to a UV dryer in a printing apparatus,

In order to uniformly irradiate the entire surface of the printing surface with UV having a high UV intensity, the above-described UV irradiator irradiates the printing surface with the set amount of UV light necessary for curing the printing surface of the printed matter. In addition, the UV illuminator of the UV irradiator is provided with a UV lamp in a concentrating device having a short focal length, and the UV illuminator is set so that the focus of the UV substantially coincides with the printing surface of the printed matter. In the state of being moved in parallel with the set speed on the printing surface,

[0014] The UV illuminator is translated on the printing surface at a set speed in a state where the focus is substantially coincident with the printing surface of the printed matter, so that the UV of the set amount of light required for the curing on the printing surface is obtained. The problem was solved by a turntable type UV multi-color printing device, characterized by uniformly irradiating the entire surface of the printing surface uniformly in a short time in a state where the UV intensity is large. is there.

[0015]

According to the present invention, there is provided a pallet for placing and transporting various plastic products and other printed matter at equal angles around the circumference of the turntable. At the opposing positions, the number of printing machines and UV irradiation machines corresponding to the number of printing colors are alternately arranged, and the printed matter is successively placed on each pallet by the supply means at the supply position of the turntable and transported, and transported. In the process, printing with the UV ink of each printing machine and curing (a kind of drying) of the printing surface (UV ink) by the UV irradiation of each UV irradiator, printing of the set number of colors and the cured printed material at the discharge position In a turntable type multicolor printing apparatus provided so as to be discharged to the outside by discharging means,

In order to uniformly irradiate the entire surface of the printing surface with UV having a high UV intensity, the above-mentioned UV irradiator irradiates the printing surface with the set amount of UV light necessary for curing the printing surface of the printed matter. In addition, the UV illuminator of the UV irradiator is provided with a UV lamp in a concentrating device having a short focal length, and the UV illuminator is set so that the focus of the UV substantially coincides with the printing surface of the printed matter. In preparation for a state in which the turntable is rotated intermittently at the installation angle of the UV printer,

[0017] The printed matter printed by the UV printing machine is moved under the UV illuminator of the UV irradiator at a fixed position at a set speed, that is, at the rotation speed of the turntable, thereby irradiating the printed surface of the printed matter with UV light. The problem is solved by a turntable type UV multicolor printing apparatus characterized in that the entire printing surface is uniformly cured.

[0018]

Embodiment 1 Next, an embodiment of the present invention will be described with reference to the drawings. Pallet 3 for placing and transporting various plastic products and other printed materials 2 at equal angles around the circumference of the turntable 1
And the number of printing presses (five in the illustrated example) corresponding to the number of printing colors (eg, five colors) is provided above the turntable 1 intermittently rotating at the installation angle of the pallet 3 and facing the pallet 3. And a UV irradiator 5 are alternately arranged, and the printed matter 2 is placed on each pallet 3 one after another by the supply means 7 at the supply position 6 of the turntable 1 and transported.
Printing with V ink and curing of the printing surface (UV ink) 2a by UV irradiation of each UV irradiator 5 (a kind of drying)
In a turntable type multi-color printing apparatus provided with a set number of colors (five colors) of printed and cured prints 2 to be discharged outside by discharge means 9 at a discharge position 8.
Pertains to UV irradiator 5,

The printing surface 2 of the printed matter 2 is
UV light of the UV irradiator 5 is used to uniformly irradiate the entire surface of the printing surface 2a with high-intensity UV when irradiating the printing surface 2a with the set amount of UV light necessary for curing the surface a. The tool 10 is provided with a UV lamp 12 in a focusing instrument 11 having a short focal length (see FIG. 2),
The UV illuminator 10 is provided so as to translate on the printing surface 2a at a set speed while the focus F of the UV light substantially matches the printing surface 2a of the printed matter 2.

The UV illuminator 10 is set so that its focal point F is
Is moved in parallel with the printing surface 2a at a set speed in a state where the printing surface 2a substantially coincides with the printing surface 2a. Is a turntable type UV multi-color printing apparatus A in which the entire surface of the printing surface 2a is evenly irradiated with the UV light.

In the above-described apparatus A, the U
With the focal length of the V illuminator 10 being adjustable, the printed matter 2
UV intensity on the printing surface 2a of
The moving speed of the lighting device 10 is adjusted so as to adjust the UV irradiation time, and thereby, the U
Differences in characteristics of V ink, differences in characteristics for each color, differences and changes in curing conditions when overprinting, UV irradiation tools, UV
Differences in lamp output, etc., differences in printed materials, shapes, etc.
Provision is made to adjust to various other conditions.

In the above and illustrated embodiments, the UV illuminator 10
Is an example of curing a printed surface of a printed material using a UV lamp with an output of 3 kw and 120 w / cm. In this case, the focal length of the UV illuminator 10 is about 50 mm, and the printed surface 2
The UV intensity at a was set to about 900 mw, the UV irradiation time was set to about 0, 6 seconds, and the moving speed was set to about 5 m / min.

[0023]

[Embodiment 2] Another embodiment of the present invention will be described with reference to the same drawing as the above embodiment. Various kinds of plastic products and other printed materials 2 are placed at equal angles on the circumference of a turntable 1. The pallet 3 to be conveyed is provided. The position corresponding to the number of printing colors is provided at a position facing the pallet 3 above the turntable 1 provided so as to intermittently rotate not to the installation position of the pallet 3 but to the installation position of the printing press 4. Number of printing presses 4 and UV
Irradiators 5 are arranged alternately, and printed matter 2 is turned on turntable 1
Are placed on each pallet 3 one after another by the supply means 7 at the supply position 6 and are conveyed. During the conveyance process, the printing with the UV ink of each printing machine 4 and the printing surface of the UV irradiation with the UV irradiation of each UV irradiating machine 5 are performed. 2) Curing (a kind of drying) of 2a, and printing of a set number of colors and cured printed material 2 at discharge position 8
In the turntable type multi-color printing apparatus provided so as to be discharged to the outside by the discharging means 9,

The printing surface 2 of the printed matter 2 is
UV light of the UV irradiator 5 is used to uniformly irradiate the entire surface of the printing surface 2a with high-intensity UV when irradiating the printing surface 2a with the set amount of UV light necessary for curing the surface a. The tool 10 is provided with a UV lamp 12 in a focusing instrument 11 having a short focal length (see FIG. 2),
The UV illuminator 10 is provided so that the UV focus F is substantially coincident with the printing surface 2a of the printed matter 2, and the turntable 1 is provided so as to intermittently rotate at the installation angle of the UV printer 4. ,

The printed matter 2 printed by the printing machine 4 moves under the UV illuminator 10 of the UV irradiator 5 at a fixed position and moves at a set speed, that is, the rotation speed of the turntable 1, so that the printed surface 2a of the printed matter 2 is printed. Is irradiated with UV, and the printing surface 2a
Is a turntable type UV multi-color printing apparatus B which cures the entire surface of the printer uniformly.

In the case of the present apparatus B, although it is a minute problem, when the printed material 2 passes below the UV illuminator 10 and is irradiated with UV by the rotation of the turntable 1, the center of the turntable 1 For example, the UV lamp 12 of the UV illuminator 10 is tilted in order to correct the difference in irradiation time between the arc-shaped irradiation surface at a position far from 0 and the arc-shaped irradiation surface at a close position by adjusting the UV intensity. For example, the focal length is provided so as to be short at a position far from the center C and long at a near position. (See Fig. 5)

[0027]

In the case of the first embodiment, when the printed matter 2 is placed one after another by the supply means 7 from the supply position 6 on each pallet 3 of the turntable 1 intermittently rotating at an angle of the pallet 3, The printing is paused at the position of the one-color printing machine 4 to print the first color (eg, black), and then temporarily stopped below the UV irradiation machine 5 in the next step, and the UV illuminator 10 irradiates the printing surface 2a. However, the printing surface 2a is cured by moving in parallel at a set speed, and printing is performed by a second color (eg, blue) printing machine 4 in the next step, and the printing surface 2a is cured by a UV irradiation machine 5 in the next step. ,
Printing and curing are sequentially performed to the fifth color (for example, white, green, and red), and the printed matter that has been subjected to the five-color printing and curing is sequentially taken out of the turntable 1 from the discharge position 8 by the discharge means 9.

In the case of the second embodiment, the turntable 1 is
Instead of the angle directed to the pallet as in the above example, it rotates intermittently at the angle directed to the printing press 4, and the printed matter 2 printed by the printing press 4 passes below the UV irradiator 5 to the position of the next printing press 4. In the process of moving at a set speed (adjusting the rotation speed of the turntable), UV irradiation is performed to cure the printing surface 2a, and the rest is the same as the first embodiment.

[0029]

[Effect] Turntable type U using new type of UV ink
When printing a printed matter with a V multi-color printing apparatus, use a condensing illuminator as the UV irradiator and set the focal length short at the same time, and set the focal point to approximately match the printing surface, and then use the UV illuminator or printed matter By irradiating one of them with translation at a set speed, there is an excellent feature that the entire printing surface can be cured uniformly, thereby enabling overprinting printing with UV ink, which has been considered impossible in the past,
In addition to the effects of enabling printing on materials (eg, polycarbonate) that were previously unsuitable for UV ink printing, such printing is performed at high speed and high efficiency using a turntable type UV multicolor printing device. Economic effects can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing a schematic configuration of an embodiment (common to Embodiments 1 and 2) of the present invention.

FIG. 2 is an explanatory view of a light-collecting device used for the UV irradiation device of the present invention.

FIG. 3 is an explanatory view of a lighting device used for a conventional UV irradiator, wherein (a) is a semi-condensing type (parallel ray type) and (b) is a diffusion type (diffuse reflection type).

Fig. 4 Horizontal distance and UV on the irradiation surface of various lighting fixtures
The figure which shows the relationship of intensity | strength.

FIG. 5 is an explanatory view of UV irradiation in the case of the embodiment apparatus (B).
Is a partial plan view, and (b) is a cross-sectional view of (iro).

[Explanation of symbols]

 A Example device 1 B Example device 2 C Center F Focus 1 Turntable 2 Printed matter 2a Printing surface 3 Pallet 4 Printing machine 5 UV irradiator 6 Supply position 7 Supply means 8 Discharge position 9 Discharge means 10 UV illuminator 11 Condenser Molding device 12 UV lamp 13 Semi-focusing device 14 Diffusion type device 15 Electrostatic brush blow

Claims (5)

[Claims] 1. A pallet for placing and transporting various plastic products and other printed matter at equal angles on a circumferential portion of a turntable, wherein the pallet is located at a position facing the pallet above a turntable that intermittently rotates at an installation angle of the pallet. The number of printing machines and UV irradiators corresponding to the number of printing colors are alternately arranged, and the printed matter is placed on each pallet one after another by the supply means at the supply position of the turntable, and is conveyed. Printing with the UV ink of the machine and curing (a kind of drying) of the printing surface (UV ink) by the UV irradiation of each UV irradiator, and printing of the set number of colors and the cured printed material at the discharge position by the discharge means to the outside The present invention relates to a UV irradiator in a turntable type multicolor printing apparatus equipped to discharge to a printer, and is necessary for curing the printing surface of a printed material by the above UV irradiator. Irradiates the printing surface with the set amount of UV light,
In order to uniformly irradiate the entire surface of the printing surface with UV having a high UV intensity, the UV illuminator of the UV irradiator is provided with a condensing device having a short focal length and a UV lamp.
The V illuminator is provided so as to translate on the printing surface at a set speed in a state where the focus of the UV is substantially coincident with the printing surface of the printed material. By moving in parallel with the printing surface at the set speed while keeping the printing surface substantially in line with the printing surface, the UV of the set amount of light required for curing
Characterized in that UV light is uniformly irradiated in a short time in a state where the UV intensity is large, so that the entire printing surface is uniformly cured. 2. The apparatus according to claim 1, further comprising a UV irradiation device having a focal length of a UV illuminator which is adjustable to adjust a UV intensity with respect to a printing surface of a printed matter, and a moving speed of the UV illuminator being adjustable to reduce a UV irradiation time. The turntable type UV multicolor printing apparatus according to claim 1, wherein the apparatus is adjusted. 3. A 3 kW, 120 w / cm U illuminator for a UV illuminator.
As an example of curing the printed surface of a printed material using a V lamp, the focal length of a UV illuminator is about 50 mm, the UV intensity on the printed surface is about 900 mw, the UV irradiation time is about 0, 6 seconds, and the moving speed is about 5 m / min. The turntable type UV multicolor printing apparatus according to claim 1, which is set. 4. A pallet for placing and transporting various plastic products and other printed matter at equal angles on a circumferential portion of the turntable, and a printing color number is provided at a position facing the pallet above the intermittently rotating turntable. A corresponding number of printing machines and UV irradiators are arranged alternately, and the printed matter is placed on each pallet one after another by the supply means at the supply position of the turntable and transported. Printing and curing (a kind of drying) of the printing surface (UV ink) by the UV irradiation of each UV irradiator, and the printing of the set number of colors and the cured printed matter are discharged to the outside by the discharge means at the discharge position. In the turntable type multi-color printing apparatus provided, the above-described UV irradiator irradiates the printing surface with a set amount of UV light necessary to cure the printing surface of the printed matter,
In order to uniformly irradiate the entire surface of the printing surface with UV having a high UV intensity, the UV illuminator of the UV irradiator is provided with a condensing device having a short focal length and a UV lamp.
The V illuminator was prepared so that its UV focus was substantially aligned with the printing surface of the printed matter, and the turntable was installed so that it could be intermittently rotated at the installation angle of the UV printer. The printed material is moved under the UV illuminator of the UV irradiator at a fixed position at a set speed, that is, at the rotation speed of the turntable, so that the printed surface of the printed material is moved to the U side.
A turntable type UV multicolor printing apparatus characterized in that the entire surface of a printing surface is uniformly cured by irradiating V. 5. When a printed material is irradiated with UV by rotating a turntable under a UV illuminator, irradiation occurs on an arc-shaped irradiation surface located far from the center of the turntable and on an arc-shaped irradiation surface located near the center of the turntable. In order to correct the time difference by adjusting the UV intensity, the focal length is provided to be short at a position far from the center and to be long at a close position by means such as providing a UV lamp of a UV illuminator at an angle. Item 4. The turntable type UV multicolor printing device according to Item 4.