JP2008254365A - Method of inkjet no-printing plate digital full color printing, and printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To produce a high quality printing image in a short time at a reduced cost onto an object to be printed such as a foamed resin which has ink absorbency and is vulnerable to heat. <P>SOLUTION: A predetermined printing image is printed onto an object to be printed by ejecting one of an ultraviolet ray hardening type ink, an electron beam hardening type ink or an infrared ray hardening type ink having a predetermined concentration onto a predetermined position of the object 2 to be printed from inkjet printer heads 3A-3D to form the printing image, and thereafter carrying out over a whole printing region of the object to be printed the printing operation for a head width which radiates one of the ultraviolet rays, electron beams, or infrared rays with an intensity appropriate for the ink concentration of the printed part from a radiating device 6 to instantaneously harden and dry the ink. A higher quality printing image is printed in a short time period on the object to be printed by printing the same image as the printing image so as to be superimposed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an ink jet printing method and a printing machine suitable for an object to be printed that has ink permeability (absorbability) such as a foamed resin such as a polystyrene resin used for a packaging material or the like.

Foamed resins such as expanded polystyrene resin are used for packaging materials such as food packaging, and it is necessary to print symbols, characters, manufacturer name, and date of manufacture, etc. that express the contents. However, high-quality printing is required for expensive ones.
Conventionally, in the case of printing directly on the packing material (printing object) by the usual screen printing or the like as described above, in the case of a color image, the printing image design process, the color separation film creation process, There is a problem that a printing plate making process and a printing process (overprinting for every four colors) of printing plates (four plates of C, M, Y, and K) are required, and there are many processing steps and a high printing cost. When screen printing is performed on a packaging material (printing object) made of such a foamed resin, it is difficult to express a mixed color by mixing inks during printing because of the characteristics of the ink used. There is a problem that subtle colors cannot be expressed due to the combination.
In addition, since the foamed resin has ink permeability (absorbability) and the thickness of the printing object such as a packing material is thicker than that of paper or the like, the height of the printing surface is not constant in some cases. There is a problem that printing becomes unclear due to bleeding, blurring, and the like.
Due to the problems described above, a method of attaching a printed label or the like to an object such as a packing material made of foamed resin has been adopted, but the packing material made of foamed resin has a moisture content. In many cases, the label material and the printing method are required to have water resistance, and further, it is necessary to devise a method for adhering the label. This method has a problem that the amount of work and cost increase.

  In the method of printing directly on a printing object other than foamed resin, UV curing is performed on the printing medium as a method of performing inkjet printing on a printing medium (printing object) that does not absorb ink, such as metal and ceramics. A step of applying a coating solution containing a mold resin composition (step 1), a step of irradiating the coating solution with ultraviolet rays to cure the coating solution to form a coating film (step 2), A step of printing information on the coating film of the printing medium using a recording liquid (ink) containing an ultraviolet curable resin composition by an ink jet printing method (step 3), printed on the printing medium There is a printing method (for example, refer to Patent Document 1) including a step (step 4) of curing a recording liquid (ink).

  Similarly, in the method of directly printing on a printing object other than the foamed resin, it is suitable for a printing object (printing object) made of a material having a high surface smoothness and a low ink water absorption like a resin molded product or a resin substrate. As a method of performing ink jet printing, in ink jet printing in which an ultraviolet curable ink is ejected from an ink ejection unit and attached to a printing material, and the ink is cured by irradiating the ink with ultraviolet light, the ink is applied to the printing material. In order to move to a predetermined position of the already solidified ink without being pulled by the previously deposited liquid ink and adhere and harden the ink as a first method, A method of changing only the feed direction and the feed pitch or the feed pitch of any one of the ink discharge units, and the second method is the ink discharge unit As discharged et the ink does not go to the ink position of the liquid state of the printing object surface, a method for changing the feed pitch (e.g., see Patent Document 2.) It is.

  Similarly, in the method of directly printing on a printing object other than the foamed resin, only the surface is used as a method for performing ink jet printing on a recording medium (printing object) such as plain paper, coated paper, or art paper having ink permeability. The distance between the print head that discharges the radiation (electron beam) curable ink and the radiation (electron beam) irradiation device that performs radiation curing of the ink is also determined in order to cure the penetrated internal ink. ) Or / and the amount of ink, and a method of forming an image (see, for example, Patent Document 3).

  In addition, as an ink jet printing method for a printing medium (printing object) having low ink absorbability such as glass, the ink is made into an ultraviolet curable type, a thermosetting type, an electron beam curable type, and ultraviolet rays, infrared rays, There is a method of irradiating an electron beam (for example, refer to Patent Document 4).

  Also, in a printing method other than inkjet printing, an infrared curable ink is used as a filler that fills a space between copper patterns of a printing medium (printing object) having a low ink absorption such as a printed circuit board (for example, , Patent Document 5), and after removing the electron beam curable ink on a printing medium (printing object) having a low ink absorption such as a resin film for forming a transparent conductive film, and then removing the solvent by drying. There exists the method (for example, refer patent document 6) which forms a transparent conductive film on a resin film by performing an electron beam hardening process after a process and a rolling process.

JP 2002-225415 A JP 2006-110746 A Japanese Patent Application Laid-Open No. 2004-74555 JP 2004-139162 A JP 2003-204012 A JP-A-5-36314

  The present invention solves the above-mentioned problems, and an object of the present invention is to provide a printing object that has ink permeability (absorbability) and is easily affected by heat, such as a foamed resin such as a polystyrene resin. On the other hand, when printing, a high-quality print image is created in a short time and the cost is reduced.

  In the present invention, the heat of the print object made of foamed resin when irradiating any one of ultraviolet rays, electron beams, and infrared rays by black (K) discharged from the inkjet printer head to the print object. To reduce the influence, i.e. deformation, dissolution, fuming etc.

  In addition, the present invention is to obtain a good print image by suppressing a decrease in color density of a print image printed on a print object made of a foam resin having ink permeability (absorbability).

  Further, the present invention is to perform preferable color reproduction when printing on a printing object made of a foamed resin having ink permeability (absorbability).

  In the present invention, when printing is performed on a printing object made of a foam resin having ink permeability (absorbability), the radiation dose to be irradiated for curing and drying the ink is set to an optimum value. is there.

  Further, the present invention is to form a good print image even on a print object whose height (thickness) is not constant.

  In addition, the present invention eliminates the need for plate production, plate washing after printing, and storage, as in screen printing using the conventional four plates, and obtains high-quality printed images in a short time, while at the same time costs It is to reduce.

  In addition, the present invention simplifies the work and reduces the cost by eliminating the label creation work and the sticking work as in the conventional method of sticking the printed label on the target object, and printing directly on the print target object. It is to be.

  (1) The present invention has ink penetrability (or absorptivity) and each color from four color ink jet printer heads installed in a printer head module at a predetermined position of a print object that is easily affected by heat. A print image is formed by ejecting any one of the curable inkjet inks of a predetermined density corresponding to the above, ultraviolet rays, electron beams, and infrared rays (print image forming processing operation), and then the print portion according to the ink density A printing operation consisting of an operation (irradiation processing operation) of instantaneously curing and drying (curing in a short time) the printed ink by irradiating any one of an ultraviolet ray, an electron beam, and an infrared ray in one of the target prints. For one line (for the width of the printer head) in the direction (for example, the X direction), the print image forming processing operation and the irradiation processing operation by the ink ejection are stopped before A printer head module moving operation is performed to move the printer head module in the other direction (Y direction) by the printing width of the printer head. Thereafter, the print image forming processing operation and the irradiation processing operation by the ink ejection and the printer head module moving operation are performed. By repeating the process sequentially over the entire print target area of the print object (referred to as “all area print operation for n lines”), there is no ink jet for printing a print image having a predetermined color and shape on the print object. This is a digital full color printing method.

  (2) According to the present invention, after the printing operation for the one line, the overprinting that repeatedly prints the printing image for the same line as the printing image for the one line in the same direction or the reverse direction of the printing direction, or The inkjet non-plate according to (1), wherein after the printing operation for all the print target areas for the n rows, overprinting is performed to repeatedly print a print image for the entire print target area that is the same as the print image for the entire print target area. This is a digital full-color printing method.

  (3) According to the present invention, among the ink ejected from the printer head, the ejection amount of black (K) ink can be easily visually confirmed within a range where the intent (reproducibility or fidelity) of the image is not lost. The inkless plateless digital full-color printing method according to (1) or (2), wherein the reduction adjustment is performed to such an extent that it cannot be confirmed.

  (4) In the present invention, the ultraviolet curable ink is a cationic ink containing an oxetane compound as an ultraviolet curable substance or a radical ink containing an acrylic monomer as an ultraviolet curable substance. The inkjet-less plateless digital full-color printing method according to (3).

(5) The present invention relates to a printer head module that can move in the vertical and horizontal directions (X and Y directions) and the vertical direction (Z direction) in the horizontal direction, a print control device that controls the inkjet printer, and adjustment of irradiation intensity. Inkless plateless digital full-color printing press comprising: an irradiation device that irradiates any one of ultraviolet rays, electron beams, and infrared rays; and a printing control device and a control computer that controls the irradiation device via the printing control device Because
The printer head module includes a printer head unit composed of four color ink jet printer heads movable in a horizontal (X or Y) direction and a vertical (Z) direction, and ultraviolet rays, electron beams, infrared rays on each printer head of the printer head module. An ink supply device that supplies any one of the curable inkjet ink and an inkjet printer head control device that moves and controls the printer head module in the horizontal (X or Y) direction and the vertical (Z) direction,
The irradiation device for irradiating any one of the ultraviolet ray, electron beam, and infrared ray comprises an irradiation tube and a reflecting mirror, and the irradiation intensity is adjusted by a control computer via the print control device,
Under the control of the printing control device, an image pattern such as a predetermined character or pattern is ejected from each of the four color printer heads on a printing object that has ink permeability (or absorption) and is easily affected by heat. After forming with any one curable ink of ultraviolet rays, electron beams, and infrared rays, the ink ejected onto the print object is irradiated with any one of ultraviolet rays, electron beams, and infrared rays by the irradiation device. The ink-less plateless digital full-color printing machine that instantaneously cures and dries the ink (cures in a short time) and prints a print image having a predetermined color and shape on the print object.

  (6) In the present invention, any one of the ultraviolet ray, the electron beam, and the infrared ray is ejected from the ultraviolet ray, the electron beam, and the infrared ray to form a print image on the print object, and the ultraviolet ray, the electron beam, and the infrared ray. According to (5), the distance between the printing surface of the printing object and the tip position of each printer head of the printer head module is kept constant according to the vertical height of the printing object during the irradiation operation. This is an inkjet-less digital full-color printing machine.

  (7) In the present invention, the printer head is arranged in the order of yellow (Y), magenta (M), cyan (C), and black (K) in the moving direction of the head. Inkjet plateless digital full-color printing machine described in 1).

  (8) The present invention is the above (5), (6) or (7), wherein the printer head maintains the temperature at a constant value by a hot water circulation means for circulating hot water in the vicinity of the printer head through a pipe. Inkjet plateless digital full-color printing machine.

  According to the present invention, an inkjet plateless digital full-color printing machine and printing method using any one of ultraviolet, electron beam, and infrared curable inks, that is, an inkjet printer head that uses any one of ultraviolet, electron beam, and infrared curable inks. After forming a print image on a printing object by discharging from the print object (print image formation process by ink discharge), the print image is irradiated with any one of the ultraviolet rays, electron beams, and infrared rays (irradiation process) to print The cured ink is instantly cured and dried, so that it has high quality for printing objects that have ink permeability (absorbability) like foamed resins such as expanded polystyrene resin and are susceptible to heat. A printed image can be created in a short time and the cost can be reduced.

  In the printing machine and printing method of the present invention, the black (K) data of the image data is adjusted by image processing, and the black (K) ink ejected from the inkjet printer head to the printing object. The amount of foaming when irradiating any one of ultraviolet rays, electron beams, and infrared rays is adjusted so that the amount is slightly reduced and adjusted so that it cannot be easily confirmed when the printed image formed on the printing object is visually observed. The influence of heat of the printing object made of resin, that is, deformation, dissolution, smoke generation, and the like can be reduced.

  Further, the printing machine and the printing method of the present invention perform ink printing by performing an overprint processing operation that repeats a print processing operation (print image formation processing operation and irradiation processing operation by ink ejection) at least once on the print object. A good print image can be obtained by suppressing a decrease in the color density of a print image printed on a print object made of a foamed resin that has penetrability (absorbability) and is easily affected by heat.

  Further, the printing machine and the printing method of the present invention can perform preferable color reproduction by adjusting the printing color by setting at the time of image processing by the control computer or print data creation.

  In the printing machine and the printing method of the present invention, when the printer head module moves and adjusts in the vertical direction according to the height (thickness) of the printing object, the ultraviolet rays and the electronic devices installed in the printer head module are accordingly accompanied. Similarly, the irradiation device that irradiates one of the rays and infrared rays also moves in the vertical direction. Therefore, by adjusting the irradiation intensity, the irradiation amount of any one of ultraviolet rays, electron beams, and infrared rays should be set to the optimum value. Can do.

  In the printing machine and the printing method of the present invention, the printer head module adjusts the vertical movement according to the height (thickness) of the object to be printed and irradiates any one of ultraviolet rays, electron beams, and infrared rays. Since the irradiation intensity of the apparatus can be adjusted, a good printed image can be formed even on a printing object whose height (thickness) is not constant.

  Furthermore, the inkjet non-plate digital full-color printing machine and printing method of the present invention do not require the production of a plate, washing of the plate after printing, and storage, compared with the conventional screen printing using four plates. As a result, a high-quality printed image can be obtained and the cost can be reduced.

  Similarly, the ink-jet plateless digital full-color printing machine and printing method of the present invention eliminates label creation work and pasting work compared to the conventional method of pasting a label printed on a target object, and directly prints on the print target object. Therefore, the operation is simplified and the cost can be reduced.

The present invention is an inkless plateless digital full-color printing machine and printing method suitable for a printing object that has ink permeability (or absorbability) and is easily affected by heat. First, the inkless plateless digital of the present invention. The full color printing machine 1 will be described.
The printing machine 1 prints a print image such as a predetermined character or design on a print object 2 that has ink permeability (or absorbability) and is easily affected by heat, as shown in FIG. Furthermore, the printer head module 3 that can move in the vertical and horizontal directions (X and Y directions) and the vertical direction (Z direction) in the horizontal direction, the print control device 8 that controls the printing press, and the ultraviolet rays that can adjust the irradiation intensity. , An irradiation device 6 that irradiates any one of an electron beam and an infrared ray, and the printing control device 8 and a control computer 9 that controls the irradiation device 6 via the printing control device 8.

The printer head module 3 includes a printer head section (not shown) composed of four-color ink jet printer heads 3A to 3D movable in the horizontal (X or Y) direction and the vertical (Z) direction, and the printer heads 3A to 3D. An ink supply device (not shown) for supplying any one of ultraviolet, electron beam, and infrared curable inkjet ink and the printer head module are moved and controlled in the horizontal (X or Y) direction and the vertical (Z) direction. And an inkjet printer head control device 4 for performing the above.
The irradiation device 6 selects one of ultraviolet rays, electron beams, and infrared rays. In this embodiment, ultraviolet light will be described as an example. The ultraviolet (UV) irradiation device 6 includes an ultraviolet irradiation tube 6A and a reflecting mirror 6B, and the irradiation intensity is adjusted by the control computer 9 via the printing control device 8.

Under the control of the printing control device 8, an image such as predetermined characters or designs on the printing object 2 that has ink permeability (or absorbability) placed on the flat bed 5 and is susceptible to heat. After the pattern is formed by ultraviolet curable ink discharged from each of the four color printer heads 3A to 3D, the ultraviolet irradiating device 6 irradiates the ultraviolet curable ink discharged onto the printing object 2 with ultraviolet rays. Then, the ink is instantaneously cured and dried (cured in a short time).
During the radiation curable ink ejection and irradiation operation, the interval between the printing surface of the printing object and the tip position of each printer head of the printer head module is made constant according to the vertical height of the printing object. Hold.

The printer heads 3A to 3D are arranged in the order of yellow (Y), magenta (M), cyan (C), and black (K) with respect to the moving direction of the head.
The printer heads 3 </ b> A to 3 </ b> D maintain the temperature at a constant value by a hot water circulation device 7 that circulates hot water in the vicinity of the printer head through a pipe, and sets the temperature so that the ink viscosity is suitable for the printer head. .

Next, the inkjet plateless digital full color printing method of the present invention will be described.
As shown in FIGS. 1, 2 and 4, the printing method of the present invention has a printer head module at a predetermined position of a printing object 2 that has ink permeability (or absorbability) and is easily affected by heat. After the four-color ink jet printer heads 3A to 3D installed in FIG. 3 are ejected with ultraviolet curable ink jet inks of a predetermined density corresponding to the respective colors to form a print image (print image forming processing operation by ink discharge) A printing operation comprising an operation (ultraviolet irradiation treatment operation) of irradiating the printed portion with an ultraviolet ray of an amount corresponding to the ink density from the irradiation device 6 and instantaneously curing and drying (curing in a short time) the printed ink. the one of the direction of the object printout 2 (e.g., X direction) after one row with respect to (X _1), stops the print image formation process operation and the UV irradiation process operation by the ink discharge And said printer head module 3 to the printer head printing width (Y ₁₎ only performs a printer head module movement which moves in the other direction (Y direction), the print image forming process operation and an ultraviolet irradiation treatment with subsequent said ink ejection Performing all printing area printing operations (X ₁ , X ₂ ... X _n ) for n rows in which the operation and the printer head module moving operation are sequentially repeated with respect to all the printing target areas of the printing object _2. Thus, a print image having a predetermined color and shape is printed on the print object. In addition to the ultraviolet rays, an electron beam or an infrared ray may be irradiated. In this case, the ink is an electron beam curable ink or an infrared curable ink.
When the conventional printing method, i.e., inkjet printing is performed on the printing object 2 and then excessive heat drying or ultraviolet irradiation is performed, the printing object 2 is heated as shown in FIG. Although the phenomenon that the surface deforms or dissolves due to the influence, moderate ultraviolet rays are irradiated to the printed image formed by the ultraviolet curable inkjet ink having the adjusted concentration by the printing method of the present invention. Therefore, as shown in FIG. 3A, the influence of the heat of the printing object, that is, deformation or dissolution can be prevented.

Although a certain degree of print image quality can be obtained for the printing object 2 that has ink permeability (or absorbability) and is easily affected by heat by the printing method, the following overlapping printing is performed. As a result, a higher quality printed image can be obtained.
As shown in FIG. 5 (a), after the printing operation for one line, the overprinting is performed by moving a print image for one line identical to the print image for one line to the original head position, Overprinting that repeatedly prints in the same direction as the printing direction (for example, X ₁ ), as shown in FIG. 5B, after the printing operation for one line, the same one line as the printed image for one line After repeated printing in which the print image is repeatedly printed in the reverse direction (for example, −X ₁ ) from the printing operation end position, or after the entire area printing operation (X ₁ , X ₂ ... X _n ) for the n rows, Overprinting (not shown) is performed by repeatedly printing (X ₁ , X ₂ ... X _n ) a print image for the same print area as the print image of the entire print area.
When the print image for one line identical to the print image for one line is repeatedly printed in the direction opposite to the print direction (see FIG. 5B), as shown in FIG. 1, the printer of the printer head module is used. It is necessary to provide an ultraviolet irradiation device 6 (indicated by a dotted line) on the right side of the head. In addition to the ultraviolet rays, an electron beam or an infrared ray may be irradiated. In this case, the ink is an electron beam curable ink or an infrared curable ink.

  The ultraviolet curable ink is a cationic ink containing an oxetane compound as an ultraviolet curable substance or a radical ink containing an acrylic monomer as an ultraviolet curable substance.

  Of the inks ejected from the printer heads 3A to 3D, the black (K) ink ejection amount is reduced and adjusted to such an extent that it cannot be easily visually confirmed within a range that does not lose image reproducibility or fidelity. . The reason is that the black (K) ink has a high heat absorption rate, and the print object 2 that is easily affected by heat, such as foamed resin, is affected by heat, as shown in FIG. This is because the surface is deformed to prevent the influence of such heat.

A high-quality print image can be obtained by setting the conditions in each part in the printing apparatus in the printing method of the present invention as follows.
The print width is the width of the head or a multiple thereof.
The distance from the surface of the print object 2 to the tip of the print head is about 1 mm. As the distance increases, the ink ejection accuracy decreases.
The irradiation width of the ultraviolet irradiation device 6 is 1.2 to 1.5 times the printing width, and the irradiation output is about 140 W / cm for Full Power and about 80 W / cm for Half Power. Considering it, it was suppressed to about 80 W / cm.
The distance from the ultraviolet irradiation device 6 to the surface of the printing object 2 is normally set by the focal length of the light source, but is longer by about 2 mm to 4 mm in consideration of the influence of heat of the printing object.
The printing speed is variable in the range of 75 mm / sec to 500 mm / sec, and is adjusted according to the heat resistance of the printing object. Since the ultraviolet irradiation device 6 is installed behind the printing direction of the printer heads 3A to 3D on the printer head module 3, since the printing time is ultraviolet irradiation, the optimum printing speed is 400 mm / sec due to the irradiation time. It is.
Overprinting is performed as a printing condition for a printing object 2 made of expanded polystyrene obtained by scanning a 300 dpi print image twice (overprinting), because the ink is easily absorbed and the print density is low. By performing the overprinting, a printed image with a good density was obtained.

1 is a schematic configuration diagram of an inkjet plateless digital full-color printing machine according to the present invention. It is a figure which shows the movement state of the printer head module in the case of printing an image on all the areas of the printing target in the inkjet plateless digital full color printing machine of this invention. (A) It is a figure (cross section) which shows the state of the printing target object by the inkjet non-plate digital full color printing method (appropriate ultraviolet irradiation after inkjet printing) of this invention. (B) It is a figure (cross section) which shows the state of the printing target object by the conventional inkjet non-plate digital full color printing method (excess heat treatment drying or ultraviolet irradiation after inkjet printing). It is a figure which shows the process sequence of the inkjet plateless digital full-color printing method of this invention. (A) It is a figure which shows the procedure of the overprinting which moves a head to the original position and prints again after one line printing in the overprinting of the inkjet non-plate digital full color printing method of this invention. (B) It is a figure which shows the procedure of the superposition printing which prints again in the opposite direction from a printing end position, without moving a head, after the 1 line printing in the superposition printing of the inkjet plateless digital full color printing method of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inkjet plateless digital full color printing machine 2 Object to be printed 3 Printer head module 3A Printer head (Y)
3B Printer head (M)
3C Printer head (C)
3D printer head (K)
4 Head control device 5 Flatbed 5
6 Ultraviolet irradiation device 6A Ultraviolet irradiation tube 6B Reflector 7 Hot water circulation device 8 Print control device 9 Control computer

Claims (8)

It has ink penetrability (or absorption) and has a predetermined density corresponding to each color from the four ink-jet printer heads installed in the printer head module at a predetermined position of the print object that is easily affected by heat. After discharging a curable inkjet ink of any one of ultraviolet rays, electron beams, and infrared rays to form a print image (print image forming processing operation), an ultraviolet ray, an electron beam in an amount corresponding to the ink density on the printed portion, A printing operation consisting of an operation (irradiation processing operation) of irradiating any one of infrared rays to instantaneously cure and dry the printed ink (curing in a short time) is performed in one direction (for example, X direction) ) For one line (with the width of the printer head), and then the print image forming processing operation and the irradiation processing operation by the ink ejection are stopped, and the printer head The printer head module moving operation is performed to move the joule in the other direction (Y direction) by the printing width of the printer head. Thereafter, the print image forming processing operation and the irradiation processing operation by the ink ejection and the printer head module moving operation are performed. It is characterized by printing a print image having a predetermined color and shape on the print object by sequentially repeating all print object areas of the object (referred to as an n-line all area print operation). Inkjet plateless digital full color printing method. After the printing operation for one line, overprinting that repeatedly prints the printing image for the same line as the printing image for the one line in the same direction as or in the opposite direction to the printing direction, or all printing for the n lines 2. The inkjet plateless digital full-color printing according to claim 1, wherein after the target area printing operation, the overprinting is repeatedly performed to repeatedly print the print image of the entire print target area that is the same as the print image of the entire print target area. Method. Of the ink ejected from the printer head, the ejection amount of black (K) ink is reduced and adjusted within a range that does not lose image reproducibility or fidelity so that it cannot be easily confirmed visually. The inkjet plateless digital full-color printing method according to claim 1 or 2. 4. The ink jet according to claim 1, wherein the ultraviolet curable ink is a cationic ink containing an oxetane compound as an ultraviolet curable substance or a radical ink containing an acrylic monomer as an ultraviolet curable substance. Plateless digital full color printing method. A printer head module that can move in the vertical and horizontal directions (X and Y directions) and the vertical direction (Z direction) in the horizontal direction, a print control device that controls the inkjet printer, and an ultraviolet and electron beam that can adjust the irradiation intensity An inkjet plateless digital full-color printing machine comprising: an irradiation device that irradiates any one of infrared rays; and a control computer that controls the irradiation device via the print control device and the print control device,
The printer head module includes a printer head unit composed of four color ink jet printer heads movable in a horizontal (X or Y) direction and a vertical (Z) direction, and ultraviolet rays, electron beams, infrared rays on each printer head of the printer head module. An ink supply device that supplies any one of the curable inkjet ink and an inkjet printer head control device that moves and controls the printer head module in the horizontal (X or Y) direction and the vertical (Z) direction,
The irradiation device for irradiating any one of the ultraviolet ray, electron beam, and infrared ray comprises an irradiation tube and a reflecting mirror, and the irradiation intensity is adjusted by a control computer via the print control device,
Under the control of the printing control device, an image pattern such as a predetermined character or pattern is ejected from each of the four color printer heads on a printing object that has ink permeability (or absorption) and is easily affected by heat. After forming with any one curable ink of ultraviolet rays, electron beams, and infrared rays, the ink ejected onto the print object is irradiated with any one of ultraviolet rays, electron beams, and infrared rays by the irradiation device. Then, the ink is cured and dried instantaneously (cured in a short time), and a printed image having a predetermined color and shape is printed on the printing object, and an inkless plateless digital full-color printing machine. During the operation of ejecting one of the ultraviolet, electron beam, and infrared curable inks to form a print image on the print object and the irradiation operation of any one of the ultraviolet, electron beam, and infrared light, the print object 6. The inkjet non-printing plate according to claim 5, wherein the distance between the printing surface of the printing object and the front end position of each printer head of the printer head module is kept constant according to the height in the vertical direction. Digital full color printing machine. 7. The inkjet head according to claim 5, wherein the printer head is arranged in the order of yellow (Y), magenta (M), cyan (C), and black (K) in the moving direction of the head. Edition digital full-color printing machine. 8. The ink-jet plateless digital full-color printing according to claim 5, 6 or 7, wherein the printer head maintains its temperature at a constant value by a hot water circulating means for circulating hot water in the vicinity of the printer head through a pipe. Machine.

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