JP2010052291A - Irradiation device for ink dry hardening of intaglio printing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively dry ink in an irradiation device for ink dry hardening of an intaglio printing apparatus, by irradiating printed sheets with radiation rays that correspond to their loaded quantity and at the same time, to eliminate the influence on the sheet base material and lower the electricity cost and reducing the work load. <P>SOLUTION: In an irradiation device for ink dry hardening of a letterpress printing apparatus by which an ink on the printed sheet is dried, the irradiation device is attached with the controller which variably control the output of the radiation rays amount of irradiation, according to the stacked state of the sheets stacked on the delivery section of the printing apparatus. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a radiation irradiation apparatus that dries ink on a sheet, and particularly relates to a radiation irradiation apparatus that appropriately controls a radiation irradiation amount.

In general, a radiation irradiating apparatus for ink curing and drying used in a printing machine includes a paper discharge unit positioned downstream after printing on a sheet (9) in a printing unit (12) as shown in FIG. In (8), the ink on the sheet is dried by irradiating the sheet with radiation.

In the case of a general offset printing machine, the ink curing / drying radiation irradiating apparatus performs drying of the ink on the printed sheet by irradiating the printed sheet with light from the radiation irradiating apparatus. In recent years, radiation irradiating devices using UV curable ink, which has become the mainstream ink, irradiate the sheet with radiation (ultraviolet rays), and the ink instantly dries and solidifies. It was possible to transfer to the manufacturing cycle of the next process such as, etc., which was useful.

However, in the conventional radiation irradiation apparatus as described above, the pattern that is most difficult to dry is set to an irradiation output that can be dried in order to eliminate drying defects. When a large number of printed sheets are dried with the output setting adjusted to a pattern that is difficult to dry in this way, for patterns that are relatively easy to dry (for example, patterns with a small amount of ink), etc. As a result, excessive energy was irradiated, and not only wasted power consumed, but also the temperature of the printing press and the printing factory was increased. In addition, if DNA radiation is used when excessively irradiated, the base sequence of DNA is damaged and the base sequence cannot be read accurately, and there is also a concern about the adverse effect on the sheet base material such as loss of the sheet. It was. Furthermore, in the prior art, the operator adjusted the light irradiation output of the radiation irradiation device by visually judging from the degree of ink overlap of the printed pattern, the type of ink, the color of the ink, etc. However, there is a problem that an inexperienced worker makes adjustment work difficult.

In order to solve these problems, in order to dry the ink on the printing sheet after being printed by a plurality of printing units, radiation irradiation means for irradiating the printing sheet with radiation, and output of the radiation irradiation means And a control means for controlling the output of the radiation irradiating means based on an output control coefficient calculated using the printed picture data used when the control means forms a picture on the print sheet. The output control coefficient is calculated on the basis of the polymerization coefficient indicating the overlapping state of the pattern and the color coefficient determined for each ink color, and the polymerization is performed for all colors overlapping in a plurality of print areas on the print sheet. Calculate the product of the coefficient and the color coefficient, and calculate the output control coefficient for each print area by adding the products of all those colors. There is a radiation irradiating apparatus for ink curing drying, which is configured to control the output of the radiation irradiating means based on the output control coefficient having the largest value among the force control coefficients (for example, see Patent Document 1). ).

Japanese Patent No. 4037763

When the technique of Patent Document 1 as the prior art described above is used, output control is performed for each print sheet using print pattern data of a pattern formed on the print sheet, for example, printing speed, ink characteristics, sheet characteristics, and the like. Since the coefficient is calculated and the output of the radiation irradiating means is automatically controlled based on the output control count, the energy is efficiently used with a relatively simple configuration without any special experience. be able to. This eliminates the stain on the dried sheet that occurs when the ink is not dried, and enables stable printing of good printed matter.

However, the technique of Patent Document 1 can effectively dry the ink on the printing sheet in offset printing in which the amount of ink on the sheet is small (for example, the image line height is about 10 μm). However, when printing on intaglio printing with a large amount of ink on the sheet compared to offset printing, printing is performed by stacking, for example, about 5,000 printed sheets to be stacked on the paper discharge unit (delivery). Ink stains caused by subsequent friction between sheets, internal ink in a semi-dry state may be crushed by the load of the sheet, and a defect called “blocking” in which the semi-dry ink adheres to the sheet or ink may occur. Since these are broken paper, the prior art cannot be used for intaglio printing.

In addition, in order to suppress defects such as blocking, the operator needs to set the sheet stacking amount in the delivery of the printing press to a small amount of about 2,000 sheets, and after the printing, it is necessary to stay in the delivery for a while. Production efficiency was worse, such as increased operating hours. Until now, no countermeasures have been taken against the above-mentioned problems, and there has been a considerable room for improvement in the radiation irradiation apparatus of an intaglio printing press.

In order to solve the above-described problems, the radiation curing device for ink curing and drying of the intaglio printing press according to the present invention is a radiation irradiation device for ink curing and drying of an intaglio printing press that dries ink on a sheet after printing. The irradiation device is a radiation irradiation device for ink curing and drying of an intaglio printing press equipped with a control device that variably controls the output of the radiation irradiation amount according to the lamination state of the sheets laminated on the delivery of the printing press. is there.

Further, the radiation curing device for ink curing and drying of the intaglio printing press according to the present invention applies a load to the sheet placement plate on which the printed sheet is placed as a lamination state detection unit that detects the lamination state of the sheets laminated on the delivery. This is a radiation irradiating apparatus for ink curing and drying of an intaglio printing press that detects a laminated state of sheets by a weight detection plate provided with a weight sensor for detection.

In addition, the radiation curing device for ink curing and drying of the intaglio printing press according to the present invention is provided in the vicinity of the sheet placing plate on which the printed sheet is placed as a lamination state detecting unit that detects the lamination state of the sheets laminated on the delivery. The radiation curing device for ink curing and drying of an intaglio printing press that detects the laminated state of the sheet by sensing with at least one optical sensor that is arranged and detects the upper layer position in the laminated sheet.

Further, the radiation curing device for ink curing and drying of the intaglio printing press according to the present invention is provided in the vicinity of a conveyance chain that grips and conveys a printed sheet as a lamination state detection unit that detects a lamination state of the sheets laminated on the delivery. The radiation curing device for ink curing and drying of the intaglio printing press detects the laminated state of the sheets by the numerical value counted by the sheet counter.

Furthermore, the radiation irradiation apparatus for ink curing drying of the intaglio printing press according to the present invention is a radiation irradiation apparatus for ink curing drying of an intaglio printing press in which the radiation used in the radiation irradiation apparatus is one of ultraviolet, infrared, or electron beam. It is what.

The radiation curing apparatus for ink curing and drying of the intaglio printing press according to the present invention is capable of adjusting the radiation irradiation amount as appropriate according to the amount of sheets loaded on the sheet mounting plate existing in the delivery, so that the radiation irradiation is insufficient. In addition to being able to suppress the occurrence of blocking between sheets due to the fact that the appropriate radiation dose is sufficient, the effect of excessive radiation on the sheet substrate is minimal, and high-quality printing There is an effect that quality maintenance can be surely realized, such as being able to obtain products continuously.

In addition, since the radiation irradiation device for ink curing and drying of the intaglio printing press according to the present invention requires a minimum amount of radiation to the printed sheet, it can greatly reduce the amount of power involved in radiation irradiation. The life of the irradiation lamp to be used can be extended. In addition, it is possible to suppress the generation of damaged paper due to poor irradiation of radiation, and to achieve an effect that the cost for printing can be reduced.

Furthermore, by using the radiation irradiation apparatus for ink curing and drying of the intaglio printing press of the present invention, it is possible to realize reliable drying of the printed sheet, so that the blocking and the contact between the sheets that have been concerned about the occurrence until now have been performed. The sheet contamination that occurs can be significantly suppressed, and a large amount of about 7,000 sheets can be stacked on the delivery sheet mounting plate. Less sheet removal work is required. In addition, it eliminates the labor associated with the exchange of stacked sheets, etc., and also eliminates various adjustments, resulting in a significant improvement in workability and a reduction in downtime of the printing machine. There is an effect that can be done.

An embodiment of the present invention will be described with reference to FIGS. 1 to 4, 8 and 9. FIG. 1 is a schematic view of a radiation irradiation apparatus according to the present invention, FIG. 2 is a partially enlarged view for explaining an embodiment of the radiation irradiation apparatus, and FIGS. It is a partially expanded view for demonstrating an aspect. Further, FIG. 8 is a schematic view showing an example of a general intaglio printing press, and FIG. 9 is a schematic view showing an example of a general offset printing press.

First, a detailed description will be given of a radiation irradiating apparatus for ink curing drying of a general intaglio printing press. When printing is performed using the general intaglio printing press shown in FIG. 8, first, the sheet (9) supplied from the feeder unit (6) is printed in the intaglio printing unit (7), and then the printed sheet is printed. (9) is a mechanism laminated on the sheet mounting plate (11) existing in the delivery section (8), and downstream of the intaglio printing section (7) in order to promote drying of the ink on the printed sheet (9). A radiation irradiating device (1) for irradiating radiation is attached to one of the vicinity of the transport chain (5) supported by a plurality of supports (4) arranged in the delivery section (8) arranged in .

In addition, as shown in FIG. 9, the radiation irradiating device (1) for drying the printed sheet (9) is similarly applied to the drying device for ink curing and drying of a general offset printing press. ) And a radiation irradiation device (1) for irradiating radiation to any of the vicinity of the transport chain (5) supported by a plurality of supports (4) arranged in the delivery section (8). Has been. Here, the radiation irradiation output of the radiation irradiation apparatus can be arbitrarily set in consideration of the ink to be used, the sheet to be used, and the printing speed. For example, there is an embodiment in which a plurality of ultraviolet irradiation lamps having an output of 240 W are installed. The radiation dose can be determined in the initial setting, and a constant dose can be continuously supplied.

On the other hand, as shown in FIGS. 1 and 2, the radiation curing device for ink curing and drying of the intaglio printing press according to the present invention prints the sheet (9) supplied from the feeder section (6) in the intaglio printing section (7). Then, in order to promote the drying of the ink of the printed sheet (9), it is located downstream of the intaglio printing part (7) and is supported by a plurality of support tools (4) existing in the delivery part (8). A radiation irradiation device (1) for irradiating radiation is attached to any one of the vicinity of the transport chain (5), and the printed sheet (9) subjected to the drying process in the radiation irradiation device (1) is delivered. It is laminated on a weight detection plate (3) in which a weight sensor is incorporated in the sheet placement plate in the section (8).

In FIG. 2, the schematic which expanded the characteristic location of this invention is shown. Here, the detection data is transferred to the control device (2) that can detect the sheet stacking amount (weight) by the weight detection plate (3) and control the irradiation amount of the radiation to be connected. The radiation irradiation amount is calculated, and the irradiation amount of the radiation irradiation device (1) connected to the control device (2) is determined and instructed. The weight detection plate (3) employs a plate capable of measuring up to 150 kg. Moreover, the irradiation amount of the radiation irradiation apparatus (1) can be adjusted between 0 W and 960 W.

In addition, the radiation curing device for ink curing and drying of the intaglio printing press of the present invention does not detect the weight of the sheet (9) laminated on the sheet mounting plate (11) as shown in FIG. In some cases, detection may be performed based on the stacking height of the used sheets (9). In this case, at least one laser displacement meter, which is an optical sensor (10), is installed in the vicinity of the sheet placement plate (11), so that the stacked state of the sheets can be grasped. According to the lamination state of the sheet (9), the sheet lamination data is transferred to the connected control device (2), the irradiation amount is calculated and the irradiation amount of the connected radiation irradiation device (1) is calculated. This is a mode of determination and instruction. Here, since the sheet (9) located in the lower layer is likely to be blocked when the amount of lamination of the sheet (9) is increased, the radiation irradiation amount is set high initially, and the amount of lamination of the sheet (9) is As it increases, it will be gradually reduced. When the delivery pile is switched, the irradiation amount of the radiation irradiation apparatus (1) is set to the initial irradiation amount. Further, in the laser displacement meter, it is possible to detect the stacking height of the sheet (9) on the sheet placing plate (11) in the range of 10 cm to 1,200 cm. Furthermore, the irradiation amount of the radiation irradiation apparatus (1) can be adjusted between 0 W and 960 W.

Further, the radiation curing apparatus for ink curing and drying of the intaglio printing press according to the present invention grasps the state of the sheet (9) laminated on the sheet placing plate (11) of the delivery section (8) as shown in FIG. As a means, a numerical value attached to the vicinity of the transport chain (5) supported by a plurality of supports (4) and counted by a sheet counter (13) in which at least one printed sheet (9) passed is arranged. May also be detected. In this case, the numerical value of the sheet counter (13) is transferred to the connected control device (2), the irradiation amount is calculated, and the irradiation amount of the connected radiation irradiation device (1) is determined and designated. It is. Here, when the value of the sheet counter (13) increases, the sheet (9) located in the lower layer is likely to block. Therefore, the radiation dose is set to be high at first, and the value of the sheet counter (13) As it increases, it will be gradually reduced. When the delivery pile is switched, the irradiation amount of the radiation irradiation apparatus (1) is set to the initial irradiation amount. Moreover, the irradiation amount of the radiation irradiation apparatus (1) can be adjusted between 0 W and 960 W.

Examples of implementation in the present invention will be described in detail with reference to a schematic diagram of the radiation irradiation apparatus of the present invention shown in FIG. 1 and respective flowcharts when the radiation irradiation apparatus of the present invention shown in FIGS. 5 to 7 is used. . First, as shown in FIG. 1, the radiation irradiating apparatus of the present invention is a sheet intaglio-printed by a sheet (9) laminated on a feeder section (6) passing through a printing mechanism in an intaglio printing section (7). (9) is transported to the delivery section (8) by a gripper-type transport chain (5) connected to a plurality of supports (4) installed, and installed in its transport path (position about 10mm from the sheet pattern surface) The dried ink on the sheet is dried by irradiating the sheet (9) with radiation (here, using ultraviolet rays) by the radiation irradiation device (1). Thereafter, the printed sheet (9) is laminated on the weight detection plate (3) to which the weight sensor is attached. The weight detection plate (3) measures the weight of the stacked sheets. For example, when 2,000 sheets were stacked, the weight was about 40 kg, and when 5,000 sheets were stacked, the weight was about 100 kg.

Next, the fluctuation of the irradiation amount of ultraviolet rays as radiation will be described in detail based on the flowchart of FIG. Here, as the stacking amount of the printed sheets (9), the ultraviolet irradiation amount as radiation is 960 W (240 W × 4 lights) until 2,000 sheets are stacked (about 40 weight kg), 4,000 sheets are loaded so that the UV irradiation amount is 720 W (240 W x 3 lights) until 4,000 sheets are loaded (about 40 weight kg) and up to 4,000 sheets (about 80 weight kg). The input to the control device (2) connected to the weight detection plate (3) was set so that the ultraviolet irradiation amount would be 480 W (240 W × 2 lights) when the time (about 80 weight kg) was exceeded.

At the start of printing, radiation irradiation is output at 960 W (STEP 1), and then is output at 960 W as it is until the weight value of the weight detection plate (3) indicates 40 weight kg (STEP 2). The weight detection value of the weight detection plate (3) exceeds 40 kg and the UV irradiation output is reduced. For example, when the weight is 60 weight kg, the load is 720 W, and when the weight is 80 weight kg, the weight is 480 W (STEP 3). By repeating this STEP, appropriate ultraviolet rays are irradiated with respect to the sheet stacking amount. FIG. 2 shows a detailed illustration of the features of the present invention. As a result of performing printing using the radiation irradiation device of the intaglio printing press of the present invention, sheet contamination and significant blocking occurred at any lamination position on the printed sheet (9) laminated up to 7,000 sheets. The sheet was in excellent condition.

Next, an example of implementation when the optical sensor (10) is used for grasping the laminated state of the printed sheet (9) will be described in detail based on the flowchart of FIG. Here, until 2,000 sheets are stacked (height from the surface of the sheet stacking board is about 28 cm), the amount of UV irradiation as radiation is 960 W (240 W × 4 lights), and 2,000 sheets 4,000 sheets so that the amount of UV irradiation will be 720W (240W x 3 lamps) until 4,000 sheets are stacked (height from the surface of the sheet stacking board is about 56cm), exceeding the stacking (approximately 28cm). Input to the control device (2) connected to the optical sensor (10) so that the UV irradiation amount becomes 480W (240W x 2 lights) when the stacking (height from the sheet stacking board surface is about 56cm) is exceeded. Set.

At the start of printing, radiation irradiation is output at 960 W (STEP 1), and then is output at 960 W as it is until the detection value of the optical sensor (10) indicates “set value 28” (STEP 2). ), The set value of the optical sensor (10) exceeds the “set value 28”, and the ultraviolet irradiation output is reduced. For example, “setting value 56” is 720 W, and “setting value 84” is 480 W (STEP 3). By repeating this STEP, appropriate ultraviolet irradiation for sheet stacking is performed. FIG. 3 shows a detailed illustration of the features of the present invention. Here, the optical sensor (10) is disposed at four positions directly on the sheet placing plate (11). As a result of printing using the drying apparatus of the intaglio printing press according to the present invention, the maximum number of stacked sheets (9) on which printed sheets (9) are up to 7,000 sheets (9) are not stained. It did not occur even at the position, and the sheet (9) was in a very good state.

Next, an example of implementation when the sheet counter (13) is used for grasping the lamination state of the printed sheet (9) will be described in detail based on the flowchart of FIG. Here, until 2,000 sheets are stacked (the value of the sheet counter is 2000), the irradiation amount of ultraviolet rays as radiation is set to 960 W (240 W × 4 lights), and exceeds 2,000 sheets stacked, Until 4,000 sheets are stacked (sheet counter value is 4000), the UV irradiation amount exceeds 4,000 sheets (sheet counter value is 4001) so that the amount of ultraviolet irradiation is 720 W (240 W × 3 lights). Input to the control device (2) connected to the sheet counter (13) was set so that the amount of ultraviolet irradiation was 480 W (240 W × 2 lights).

At the start of printing, radiation irradiation is output at 960 W (STEP 1), and then is output at 960 W as it is until the display value of the sheet counter (13) indicates “set value 2000” (STEP 2). ), The set value of the sheet counter (13) exceeds the “set value 2001”, and the ultraviolet irradiation output is reduced. For example, “setting value 3000” is 720 W, and “setting value 5000” is 480 W (STEP 3). By repeating this STEP, appropriate ultraviolet irradiation for sheet stacking is performed. FIG. 4 shows a detailed illustration of the features of the present invention. Here, the sheet counter (13) is disposed on a base (not shown) of the transport chain (5) that transports the printed sheet (9). As a result of using the drying device of the intaglio printing press according to the present invention, no sheet contamination or significant blocking of printed sheets (9) having a maximum of 7,000 stacked sheets occurs at any stacking position. The sheet (9) was in a very good state.

In addition, for grasping the state of the printed sheet (9), some of the weight detection plate (3), the optical sensor (10), and the sheet counter (13) can be used in combination. In this case, a plurality of detection values are appropriately unified by a determination program (not shown). According to the present invention, it is possible to irradiate not only the amount of ink according to the type of ink, the type of sheet, and the printing speed, but also the ultraviolet rays taking into account the loaded amount of printed sheets (9). This is a technique that is particularly useful in intaglio printing with a large amount of ink. In any of the above embodiments, when the delivery pile is switched, the irradiation amount of the radiation irradiation apparatus (1) is set to the initial irradiation amount.

In the examples, the case where ultraviolet rays are used as the radiation has been illustrated, but depending on the application, infrared rays or electron beams may be used as the radiation. The radiation amount can be output to a display device (not shown). In addition, it is possible to change the radiation dose appropriately by setting the set value in detail, but it is not possible to change the radiation dose frequently, but instead, the dry state of the printed sheet (9) will vary. As a result, it is empirically understood that the product is of poor quality. In any of the above-described examples, the printed sheet (9) on which intaglio printing was performed was surely dried, and no stacking failure such as blocking or ink smearing occurred.

The above-described embodiment is merely an example, and it goes without saying that all the embodiments exist within the scope described in the claims. For example, there may be a mode in which a plurality of radiation irradiation apparatuses are arranged. In this case, the output may be controlled for each region that each radiation irradiation apparatus is in charge of to adjust each radiation irradiation amount. By doing so, a radiation irradiation apparatus capable of more efficient drying can be obtained. Further, the position where the radiation irradiating apparatus is installed is not limited as long as the sheet can be appropriately irradiated with radiation.

It is the schematic which shows the radiation irradiation apparatus of this invention. It is a partial enlarged view of the radiation irradiation apparatus of this invention. It is a partial enlarged view of the radiation irradiation apparatus of another form of this invention. It is a partial enlarged view of the radiation irradiation apparatus of another form of this invention. It is a flowchart which shows an example of the radiation irradiation apparatus of this invention. It is a flowchart which shows an example of the radiation irradiation apparatus of this invention. It is a flowchart which shows an example of the radiation irradiation apparatus of this invention. It is the schematic which shows an example of a general intaglio printing machine. It is the schematic which shows an example of a general offset printing machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Radiation irradiation apparatus 2 Control apparatus 3 Weight detection plate 4 Support tool 5 Conveyance chain 6 Feeder part 7 Intaglio printing part 8 Delivery part 9 Sheet 10 Optical sensor 11 Sheet mounting plate 12 Offset printing part 13 Sheet counter

Claims (5)

In the radiation curing apparatus for ink curing and drying of an intaglio printing press that dries ink on a sheet after printing, the radiation irradiation apparatus outputs the radiation irradiation amount according to the lamination state of the sheets laminated on the delivery of the printing press. A radiation irradiating apparatus for ink curing and drying of an intaglio printing press, which is provided with a control device for variable control. As a lamination state detection means for detecting the lamination state of the sheets laminated on the delivery, the sheet lamination state is determined by a weight detection plate provided with a weight sensor for detecting a load on the sheet placement plate on which the printed sheet is placed. The radiation irradiating apparatus for ink curing and drying of an intaglio printing press according to claim 1, wherein the radiation irradiating apparatus detects the ink curing drying. As a lamination state detection means for detecting the lamination state of the sheets laminated on the delivery, it is arranged in the vicinity of the sheet placing plate on which the printed sheet is placed, and at least one or more for detecting the upper layer position in the laminated sheet is provided. The radiation irradiation apparatus for ink curing drying of an intaglio printing press according to claim 1, wherein the laminated state of the sheet is detected by sensing with an optical sensor. As a stacking state detecting means for detecting the stacking state of the sheets stacked on the delivery, the stacking state of the sheets is detected by a numerical value counted by a sheet counter provided in the vicinity of a transport chain for gripping and transporting the printed sheet. The radiation irradiation apparatus for ink curing drying of an intaglio printing press according to claim 1. The ink used in the intaglio printing press according to any one of claims 1 to 4, wherein the radiation used in the radiation irradiation device is one of ultraviolet rays, infrared rays, and electron beams. Radiation irradiation equipment for drying.

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