JP2008020182A - Dryer for treating material surface to be printed in working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce with a simple method light beam energy (IR ray) having an infrared wavelength emitted from a light beam unit, out of light beam energy directed to a material surface to be printed for treating the material surface to be printed. <P>SOLUTION: The drier for treating the material surface to be printed in a working machine is provided. The drier is improved to reduce the light beam energy (IR ray) of the infrared wavelength emitted from the light beam unit, out of the light beam energy directed to the material surface to be printed, by a very simple means. A reflector of the drier 10 carries a dichroic layer on a front face side faced to the light beam unit and the first IR absorbing layer on a back face side. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a drying apparatus for treating the surface of a printing material in a processing machine according to the preamble of claim 1. As the processing machine, a rotary printing machine and a varnishing machine for processing a printing material are particularly suitable.

  In processing machines, it is known to use drying devices to dry UV (ultraviolet) curable printing inks and / or varnishes. This drying apparatus has at least one UV light source such as a mercury lamp or a light emitting diode that emits UV light as a light unit.

This type of drying device is known from Patent Document 1 as an irradiation device. This drying device includes an annular UV light device provided so as to extend long (over the plate width), and a reflector provided so as to be curved over a part of the peripheral edge of the device. In the light exit area, an additional reflector is provided for deflecting the UV light. The inclination of this reflector is adjustable. In this case, the reflector surface may have a dichroic coating. Opposite to the light exit area, a light absorbing device can be provided for collecting light that is not directed at the workpiece when the UV light device is stopped. In a further configuration, additional reflectors can serve as a replacement for the light absorber to some extent. As is known, the surface of this type of reflector is mirror polished. In this case, the configuration of the drying apparatus has a drawback that it is relatively expensive.
German Patent Application Publication No. 102443577

  An object of the present invention is to improve the drying apparatus of the type described at the beginning, and out of the light energy directed to the surface of the printing material for the treatment of the surface of the printing material, the red emitted from the light unit. To reduce the amount of light energy (IR light) having an outside wavelength in a simple manner.

  This problem is solved by the structural features of claim 1. Further configurations will become apparent from the dependent claims.

  The first advantage of the present invention is that the UV light curable printing ink and / or the curable varnish and / or the curable adhesive (UV printing ink, UV varnish, UV adhesive) are applied in the drying apparatus. Of the rays directed to the printing material, the IR rays are greatly reduced. This improves the fraction of the UV rays that are used and enters into the material to be printed or adjacent components of the dryer or processor that were previously caused by the IR fraction of the rays. Heat is reduced. Furthermore, the risk of overprinting the printed material is greatly reduced by reducing the unwanted amount of IR light.

  The second advantage is that the UV printing ink and / or UV varnish and / or UV adhesive applied to the printing material prior to the drying process hardens quickly while curing more gently due to reduced heat input. That is. This contributes to improving ink quality / varnish quality (ink brightness, gloss, scratch resistance, adhesion, etc.).

  The present invention is not limited to printing inks or varnishes that are cured by UV light. Rather, after an adhesive that is cured by UV light is applied to the surface of the printing material, it can subsequently be precured and / or completely cured by means of a drying device according to the invention. This type of application can be applied to a printing material from a transfer foil, for example, in the case of a printing material consisting of a plurality of layers, in the case where a plurality of layers are overlapped into one printing material, or in the case of embossed foil printing This can be done in the case of an image line forming layer.

  The invention will be described in detail on the basis of one embodiment.

  A rotary printing machine for processing a sheet-shaped printing material 19 (sheet material) includes a plurality of printing apparatuses I and II, at least one varnishing apparatus, and a paper discharge machine IV. Each printing apparatus I, II includes a plate cylinder 4 that carries a printing plate. The plate cylinder 4 is provided with at least one inking device and, if necessary, a dampening device (not shown). Here, the printing plate is inked with a medium in the form of printing ink by a form roller, in particular an inking roller, and when using a dampening device, at least one form roller, in particular at least one dampening The roller is moistened by a medium in the form of a dampening agent. Alternatively, the varnishing device III has a plate cylinder 5 (varnish drawing cylinder 5) carrying a printing plate (including a rubber blanket), to which the metering system 6 corresponds. Is provided. In this case, the printing plate is wetted by the medium in the form of a varnish by means of a form roller, here in particular an anilox-type varnish roller and a chamber doctor.

  According to FIG. 1, the printing apparatuses I and II have a plate cylinder 4 configured as a plate cylinder and a rubber blanket cylinder 3 provided adjacent to the plate cylinder 4. Here, the rubber blanket cylinder 3 cooperates with the sheet guide cylinder 1 for conveying the sheet-shaped printing material 19 in the conveying direction 7, particularly the impression cylinder. The plate cylinder 5 of the varnishing device III is similarly provided with a sheet guide cylinder 1, in particular an impression cylinder.

  In order to transport the sheet-shaped printing material 19 in the transport direction 7, at least one sheet guide cylinder is provided as a transfer cylinder 2 between the sheet guide cylinder / impression cylinder 1. If necessary, a sheet guide cylinder 8 may be provided as a reversing device between the sheet guide cylinders 1 of the printing apparatuses I and II and / or the varnishing apparatus III. The reversing device 8 shown is configured as a single drum reversing device following the law of Hinterkantenwendung. Alternatively, other inverting devices can be used. The sheet guide cylinders 1, 2 and 8 have a sheet holding device 20 known per se, for example a holding device. In this example, the sheet discharging machine IV including the take-up device 9 and the circulation type transport system having the sheet holding device 20 is used to stack the sheet-shaped printing material 19 as a pile, so that the varnishing device III In contrast, it is placed in the transport direction 7.

In the transport direction 7, behind the printing zone of the printing devices I, II (formed by the rubber blanket cylinder 3 and the sheet guide cylinder 1) and / or the varnishing zone of the varnishing device III (plate cylinder 5 and sheet) In the rear of the paper guide cylinder 1), each one drying device 10 supplies light energy onto the printing material 19. The material to be printed is one printed with UV printing ink and / or varnished with UV varnish or alternatively provided with UV adhesive. Further, if necessary, at least one drying device 10 is provided in the paper discharge machine IV in the sheet start section (FIG. 1) and / or in the horizontal paper discharge machine area (not shown). Also good.

  Each drying device 10 includes at least one light unit 11, in particular a UV light unit, extending over the plate width of the printing material 19. The drying apparatus 10 further includes at least one reflector 12 having a part of the peripheral edge curved over the plate width as a reflection mirror. In this example, the two reflectors 12 are arranged in a mirror image relationship with respect to each other with respect to the symmetry line, and are directed toward the printing material 19. This type of reflector 12 has a light emitting area 21 opened in the direction of the printing material 19 to be dried, and on the back surface 14 opposite to the printing material 19 or the light unit 11, It is in functional connection with the cooling element 15. The cooling element 15 preferably includes a plurality of cooling paths 16 through which a cooling medium such as water can flow. Alternatively, this type of cooling element 15 may comprise a plurality of cooling fins and / or cooling channels 16.

  The curved reflector 12 has a dichroic layer 22. This layer is provided on the front face 13 of the reflector facing the light unit 11. The reflector 12 has a first IR (infrared) absorbing layer 17 (FIGS. 2 and 4) on the back surface 14 of the dichroic layer 22 constituting the reflector 12, that is, on the opposite side of the light beam unit 11. ing. In a preferred configuration, the first IR absorption layer 17 is provided in a state of being fixed to the dichroic layer 22. In this case, the reflector 12 including the dichroic layer 22 and the IR absorbing layer 17 constitutes an integral constituent unit together with the cooling element 15. For this purpose, the first IR absorbing layer 17 connected to the dichroic layer 22 on the front side is provided in a state of being fixed to the cooling element 15 on the back side (FIG. 4). Alternatively, the first IR absorbing layer 17 connected to the dichroic layer 22 (as the reflector 12) may be detachably provided on the cooling element 15. The dichroic layer 22 is preferably formed by sputtering on the front surface 13 side of the first IR absorption layer 17 provided in the cooling element 15.

  In a further configuration, the reflector 12 comprises a substrate 23, for example a reflective sheet steel, preferably metallized. The reflective thin steel plate carries a first absorption layer 17 that is connected and provided on the front surface 13 in a state of being fixed to the dichroic layer 22. In the modified configuration, the substrate 23 can carry the second IR absorption layer 18 provided in a fixed state on the back side. This reflector 12 is preferably provided detachably on the cooling element 15 (in both configurations). In one configuration, the second IR absorbing layer 18 of the reflector 12 is provided correspondingly in a state of being directly adjacent to the cooling element 15. In a further variant, this reflector 12 is detachably mounted on the cooling element 15. At that time, the cooling element 15 carries the third IR absorption layer 25 provided in a state of being fixed to the cooling element, and the second IR absorption layer 18 provided in the reflector 12 is The third IR absorption layer 25 is provided adjacent to the third IR absorption layer 25. A dichroic layer 22 is preferably sputtered on the front surface 13 of the reflector 12 (or substrate 23).

  In the first configuration, the first IR absorption layer 17 is fixed on the back surface 14 of the dichroic layer 22. The first IR absorption layer is also connected in a state of being fixed to the substrate 23. A second IR absorption layer 18 is provided on the back side of the substrate 23 (FIGS. 3, 5, and 6). This type of reflector 12, particularly the second IR absorption layer 18 of the reflector, is provided correspondingly with a cooling element 15 adjacent thereto. The reflector 12, which constitutes the dichroic layer 22, the first IR absorption layer 17, the substrate 23, and the second IR absorption layer 18 and is detachably attached to the cooling element 15, and the cooling element 15, A two-piece component unit may be formed. In this case, the second absorption layer 18 and the cooling element 15 are provided in the contact slit 24 at a slight distance from each other or preferably adjacent to each other in direct surface contact with each other. (FIG. 5).

  In the second configuration, the first IR absorption layer 17 is fixed on the back surface 14 of the dichroic layer 22. This IR absorption layer is also connected in a state of being fixed to the substrate 23. A second IR absorption layer 18 is provided on the back surface of the substrate 23 (FIGS. 3, 5, and 6).

  This type of reflector 12 detachably provided on the cooling element 15, in particular the second IR absorption layer 18 of the reflector, is provided correspondingly in a state directly adjacent to the third IR absorption layer 25. The third IR absorption layer is provided in a state of being fixed to the cooling element 15 (FIG. 6). The reflector 12 that constitutes the dichroic layer 22, the first IR absorption layer 17, the substrate 23, the second IR absorption layer 18 and is detachably provided on the cooling element 15, and the third IR absorption The cooling element 15 with the layer 25 may form a two-piece constituent unit. In this case, the second IR absorption layer 18 and the third IR absorption layer 25 (of the cooling element 15) are provided in the contact slit 24 at a slight distance from each other or suitable. Are adjacent to each other in direct surface contact with each other (FIG. 6).

  In order to improve the absorption of heat rays (IR rays) in the reflector 12 or the cooling element 15, the first and / or second and / or third IR absorbing layers 17, 18, 25 have a black color Is preferred. This makes it possible in particular to completely absorb IR light. In one configuration, the first and / or second and / or third IR absorbing layers 17, 18, 25 may be composed of a black colored layer having heat resistance. In a further configuration, the first and / or second and / or third IR absorbing layers 17, 18, 25 may be composed of an anodized layer having a black color. In a further configuration, the first and / or second and / or third IR absorbing layers 17, 18, 25 may be composed of black chrome.

  The function method is as follows. As shown in FIG. 2, light energy is emitted from the light unit 11. This light energy includes in particular infrared wavelengths (IR rays) and ultraviolet wavelengths (UV rays). The light energy is directed from the light unit 11 directly or indirectly to the printing material 19 (including UV curable printing ink, UV curable varnish or UV curable adhesive or other UV curable material). obtain. The light energy directed to the reflector 12 (UV light and IR light) is such that the UV light is deflected by the reflector and directed to the printing material 19, and the IR light is dichroic layer 22 (as the reflector 12). ) And is collected by the first absorption layer 17 and discharged towards the cooling element 15, thereby being distributed on the reflector 12 via the dichroic layer 22. Coolant and / or cooling fins can dissipate the heat input brought into the cooling element 15 by the IR light (FIG. 4).

  3, 5, and 6, the light energy (UV light and IR light) directed toward the reflector 12 is applied to the printing material 19 as the UV light is deflected in the dichroic layer. Directed and IR light passes through the dichroic layer 22 (as the reflector 12) and is collected by the first absorption layer 17, passes through the substrate 23 and is collected on the second absorption layer 18. To be distributed by the dichroic layer 22.

  In the first configuration, the cooling element 15 is directly provided in the second absorption layer 18. IR light passes from the second absorption layer 18 through the contact slit 24 and is emitted at the cooling element 15 or collected by the cooling element (FIG. 5). With the coolant and / or cooling fins, the heat input brought into the cooling element 15 by the IR light can be exhausted from the drying device 10.

  In the second configuration, the second absorption layer 18 is provided with the third IR absorption layer 25 of the cooling element 15 in direct correspondence. IR light passes from the second absorption layer 18 through the contact slit 24, is collected by the third IR absorption layer 25, and is then discharged to the cooling element 15 (FIG. 6). With the cooling liquid and / or cooling fins, the heat input brought into the cooling element 15 by the IR light can be discharged from the drying device 10.

It is a figure which shows the rotary printing machine which has a drying apparatus provided corresponding to the important component. It is a figure which shows the drying apparatus of a 1st structure. It is a figure which shows the drying apparatus of a 2nd structure. It is a figure which shows the reflector structure which concerns on FIG. It is a figure which shows the reflector structure which concerns on FIG. It is a figure which shows the example of a change of FIG.

Explanation of symbols

01 sheet guide cylinder (impression cylinder)
02 Sheet guide cylinder (passing cylinder)
03 Rubber blanket cylinder 04 Plate cylinder (plate cylinder)
05 Plate cylinder (varnishing cylinder)
06 Metering system 07 Transport direction 08 Sheet guide cylinder (reversing device)
09 Take-up device 10 Drying device 11 Light unit 12 Reflector 13 Front surface 14 Back surface 15 Cooling element 16 Cooling path 17 First IR absorption layer 18 Second IR absorption layer 19 Printed material 20 Sheet paper holding device 21 Light emission region 22 Dichroic layer 23 Substrate 24 Contact slit 25 Third IR absorbing layer I First printing device II Second printing device III Varnishing device IV Discharge machine

Claims (17)

A drying device for processing the surface of a printing material in a processing machine,
A light unit extending over the plate width of the material to be printed, the light unit comprising at least one curved reflector having a dichroic layer provided correspondingly over a part of the periphery,
In the drying device, the reflector has a light emitting area that is open in the direction of the printing material to be dried, and the reflector is in functional connection with a cooling element on the back side opposite to the printing material,
The reflector (12) includes a dichroic layer (22) provided on a front surface (13) facing the light beam unit (11);
A first IR absorbing layer (17) provided on the back surface (14);
A drying apparatus comprising: The drying apparatus according to claim 1, wherein
The drying apparatus, wherein the first IR absorption layer (17) is provided in a state of being fixed to the dichroic layer (22). The drying apparatus according to claim 1 or 2,
The drying apparatus, wherein the first IR absorption layer (17) connected to the dichroic layer (22) is provided in a state of being fixed to the cooling element (15). The drying apparatus according to claim 1, wherein
The drying apparatus, wherein the first IR absorption layer (17) connected to the dichroic layer (22) is detachably provided on the cooling element (15). The drying apparatus according to claim 4, wherein
The reflector (12) includes a substrate (23), and the substrate is provided on the front surface (13) side so as to be fixedly connected to the dichroic layer (22). A drying apparatus, characterized by carrying an IR absorption layer (17). The drying apparatus according to claim 5, wherein
The reflector (12) includes a substrate (23), and the substrate is provided on the front surface (13) side so as to be fixedly connected to the dichroic layer (22). A drying apparatus comprising: a second IR absorbing layer (18) provided in a state of supporting the IR absorbing layer (17) of the first IR absorbing layer (17) and being fixed on the back side. The drying apparatus according to claim 6, wherein
The reflector (12) is detachably provided on the cooling element (15), and the second IR absorption layer (18) of the reflector (12) is directly adjacent to the cooling element (15). The drying apparatus is provided correspondingly. The drying apparatus according to claim 6, wherein
The reflector (12) is detachably provided on the cooling element (15), and the second IR absorption layer (18) of the reflector (12) is fixed to the cooling element (15). A drying apparatus characterized in that it is provided directly adjacent to and corresponding to the third IR absorption layer (25) provided in step (b). The drying apparatus according to any one of claims 1 to 8,
The drying apparatus according to claim 1, wherein the first and / or the second and / or the third IR absorbing layer (17, 18, 25) have a black color. The drying apparatus according to any one of claims 1 to 9,
The drying apparatus, wherein the first and / or the second and / or the third IR absorption layer (17, 18, 25) is formed of a colored layer having a heat-resistant black color. The drying apparatus according to any one of claims 1 to 10,
The drying apparatus, wherein the first and / or the second and / or the third IR absorbing layer (17, 18, 25) are formed of an anodized layer having a black color. The drying device according to any one of claims 1 to 11,
The drying device, wherein the first and / or the second and / or the third IR absorbing layer (17, 18, 25) is made of black chrome. The drying apparatus according to claim 3,
The reflector (12) composed of the dichroic layer (22) and the first IR absorption layer (17) forms an integral structural unit with the cooling element (15). A drying device characterized. The drying apparatus according to claim 4, wherein
The reflector (12) composed of the dichroic layer (22) and the first IR absorption layer (17) and the cooling element (15) form a two-piece structural unit. A drying device characterized. The drying apparatus according to claim 5, wherein
The reflector (12) composed of the dichroic layer (22), the first IR absorption layer (17), and the substrate (23) is a two-piece structural unit together with the cooling element (15). A drying apparatus, characterized in that The drying apparatus according to claim 6, wherein
The reflector (12) composed of the dichroic layer (22), the first IR absorption layer (17), the substrate (23), and the second IR absorption layer (18), Drying device, characterized in that it forms a two-piece construction unit with the cooling element (15). The drying apparatus according to claim 6, wherein
The reflector (12) composed of the dichroic layer (22), the first IR absorption layer (17), the substrate (23), and the second IR absorption layer (18), Drying device, characterized in that it forms a two-piece component unit with the cooling element (15) carrying the third IR absorbing layer (25).

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