JP2015093435A - Printer and printing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printer and a printing method from which a printed matter with a high printing density can be obtained at a reduced ink quantity, by coating a printing object with a coating agent before printing, in performing printing according to an in-line method.SOLUTION: A printer includes: a paper feeding unit 10 for feeding a band-like printing object W; printing units (for example, each printing unit 30) for carrying out printing on the printing object W fed by the paper feeding unit 10; and a coating unit (for example, a first coating unit 70) for coating the printing object W fed by the paper feeding unit 10 with a coating agent. In such a printer, an in-line method is applied in which a process for coating the printing object W with the coating agent by the coating unit and a process for printing the printing object W by the printing units are continuously executed.

Description

  The present invention relates to a printing machine and a printing method for performing offset printing, gravure printing, or flexographic printing on a substrate such as paper or film.

  Conventionally, in printing processes such as offset printing, gravure printing, or flexographic printing on a printed material such as paper or film, when using a printed material that is difficult to produce a print density, the amount of ink transferred to the printed material can be increased. The print density that can be expressed on this substrate has a limit. On the other hand, Patent Documents 1 and 2 disclose printing paper and the like that can obtain a printed matter having a high printing density with a smaller amount of ink by applying a coating agent on the entire surface of the printing paper. However, since the coating agent is applied to the printing paper at the time of papermaking, the paper surface condition of the printing paper may fluctuate due to the printing site environment and extreme weather fluctuations. There was a problem that it would be difficult.

  In particular, when coated paper is used as printing paper in offset printing, even if the coated paper is coated with a coating pigment, there is a fine gap between the coated pigments, and the coated paper is used in the printing process. When the ink was transferred to the ink, the ink entered the gap, so that the desired printing density could not be obtained unless the amount of ink was increased.

JP 2009-256855 A JP 2009-263853 A

  The present invention has been made in consideration of such points, and by applying a coating agent to a substrate to be printed before printing is performed when performing printing in an in-line method, the physical properties are improved. Another object of the present invention is to provide a printing machine and a printing method capable of obtaining a printed matter having a high printing density with a smaller amount of ink.

  The printing machine according to the present invention includes a paper feeding unit that supplies a belt-shaped substrate, a printing unit that performs printing on the substrate supplied by the paper feeding unit, and the printing unit in the conveyance direction of the substrate. And a coating unit that coats the printing material supplied from the paper feeding unit with the coating material, and the coating unit applies the coating agent to the printing material An in-line method is used in which a process and a printing process on the substrate by the printing unit are continuously performed.

  According to such a printing machine, when printing is performed by an inline method, a coating agent is applied to a printed material before printing is performed to improve the physical properties, thereby reducing the printing density with a smaller amount of ink. High prints can be obtained.

  In the printing machine of the present invention, drying for drying the printing material coated with a coating agent on the upstream side of the printing unit in the conveyance direction of the printing material and on the downstream side of the coating unit. A part may be provided.

  The printing machine of the present invention may further include a control unit that outputs information related to application conditions of the coating agent on the printing material by the coating unit.

  At this time, the printing machine of the present invention further includes a storage unit that stores information related to operation data of the coating process of the coating agent to the substrate, and the control unit is stored in the storage unit. Based on the information, the application unit may output information related to the application conditions of the coating agent on the printing material.

  In this case, the storage unit stores at least one of the group consisting of the coating amount of the coating agent, the printing density, the coating material cost, the air permeability, the smoothness, the temperature, and the humidity as the operation data. You may come to do.

  Here, the coating condition may be the type of coating agent.

  At this time, the storage unit is configured to store information related to the operation data of the coating process using a plurality of types of coating agents, and the control unit stores the information stored in the storage unit. Based on this, the optimum type of coating agent may be selected and output.

  Further, the storage unit stores a relational expression indicating a relationship between the coating amount and the print density for each of a plurality of types of coating agents, and the control unit stores the relationship in the storage unit. On the basis of the relational expression, the coating agent having the smallest coating amount corresponding to the required printing density may be selected as the optimum coating agent.

  Alternatively, the storage unit is configured to store a relational expression indicating the relationship between the coating material cost and the printing density for each of a plurality of types of coating agents, and the control unit stores the relationship in the storage unit. Based on the stored relational expression, a coating agent with the least coating material cost corresponding to the required printing density may be selected as the optimum coating agent.

  The coating condition may be a coating amount of a coating agent.

  At this time, the printing machine of the present invention further includes a pump for supplying a coating agent to the coating unit, and the control unit uses the pump based on the output coating amount of the coating agent. You may come to adjust the conveyance amount of a coating agent.

  The printing machine of the present invention further includes a detection unit that detects a state of the printed material on which a coating agent has been applied by the coating unit, and the control unit detects the object to be detected detected by the detection unit. The conveyance amount of the coating agent by the pump may be adjusted with reference to the state of the printed matter.

  The coating condition may be a control amount of the coating unit.

  At this time, the coating unit may have a roll coater, and the control amount of the coating unit may be the rotational speed of the roll coater.

  Further, the control amount of the coating part may be the concentration of the coating agent.

  The printing machine of the present invention further includes a detection unit that detects a state of the printed material on which a coating agent has been applied by the coating unit, and the control unit detects the object to be detected detected by the detection unit. The control amount of the coating unit may be adjusted with reference to the state of the printed matter.

  Further, the printing machine of the present invention is provided on the downstream side of the printing unit in the conveyance direction of the printing material, and applies a coating agent for giving gloss to the printing material printed by the printing unit. You may further provide the additional coating part applied to printed matter.

  At this time, the printing press of the present invention may further include a control unit that outputs information on application conditions of the coating agent to the printing material by the additional coating unit.

  Further, the printing machine of the present invention further includes a storage unit that stores information relating to operation data of the coating process of the coating agent to the printing material, and the storage unit includes the coating agent as the operation data. It is designed to store at least one of the group consisting of coating amount, coating material cost, glossiness, temperature, and humidity, and the control unit is based on information stored in the storage unit, The information regarding the coating conditions of the coating agent to the said to-be-printed material by the said additional coating part may be output.

  The printing method of the present invention includes a step of supplying a belt-shaped substrate by a paper feeding unit, a step of applying a coating agent by a coating unit to the substrate to be supplied supplied by the paper feeding unit, And a step of performing printing by the printing unit on the substrate to which the coating agent has been applied by the coating unit, and a step of applying the coating agent to the substrate by the coating unit and the printing An in-line method is used in which the printing process on the substrate by the printing unit is continuously performed.

  According to such a printing method, when printing is performed in an in-line method, a coating agent is applied to a printed material before printing is performed to improve the physical properties, thereby reducing the printing density with a smaller amount of ink. High prints can be obtained.

  According to the printing machine and the printing method of the present invention, when printing is performed in an in-line method, by applying a coating agent to a printed material before printing is performed and improving the physical properties, the amount of ink can be reduced. A printed matter having a high printing density can be obtained.

1 is a schematic configuration diagram showing an outline of a configuration of an inline-type offset printing press according to an embodiment of the present invention. It is a table | surface which shows the driving | operation data of the coating process of the coating agent to a to-be-printed material memorize | stored in the memory | storage part of the offset printing machine shown in FIG. It is a graph which shows the relationship between the coating amount in each of several types of coating agents, and printing density. It is a graph which shows the relationship between the coating material cost in each of several types of coating agent, and printing density.

  Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 are diagrams showing an inline type offset printing press (offset rotary printing press) according to the present embodiment. More specifically, FIG. 1 is a schematic configuration diagram showing an outline of the configuration of the inline offset printer according to the present embodiment, and FIG. 2 is stored in the storage unit of the offset printer shown in FIG. It is a table | surface which shows the driving | operation data of the coating process of the coating agent to a to-be-printed material. FIG. 3 is a graph showing the relationship between the coating amount and the printing density in each of a plurality of types of coating agents, and FIG. 4 shows the coating material costs in each of the plurality of types of coating agents. It is a graph which shows the relationship with printing density.

  First, the configuration of an inline multi-color offset printer according to this embodiment will be described with reference to FIG. As shown in FIG. 1, the multi-color offset printing press is configured to supply a sheet feeding unit 10 such as a sheet feeding roll that supplies a band-shaped substrate W such as paper, and a substrate W supplied from the sheet feeder 10. Printing is performed by the infeed unit 20 that applies tension, a plurality of, for example, four printing units 30 that perform printing of different colors on the substrate W conveyed from the infeed unit 20, and each printing unit 30. And a drying device 40 that performs a drying process on the printed material W. Further, on the downstream side of the drying device 40 in the conveyance direction of the printing material W, a web path unit 50 that adjusts the path length of the printing material W that has been dried by the drying device 40, and a path length by the web path unit 50. And a folding machine 60 for cutting and folding the printed material W adjusted in the above-described manner.

  As shown in FIG. 1, the infeed unit 20 is provided with a compensator roller 22 on which the substrate W supplied from the paper supply unit 10 is stretched and movable in the direction of the arrow in FIG. The magnitude of the tension applied to the substrate W is adjusted by the position of the compensator roller 22. Similarly, the web path unit 50 is provided with a compensator roller 52 on which the substrate W sent from the drying device 40 is stretched and movable in the direction of the arrow in FIG. The path length of the substrate W is adjusted according to the position.

  Further, as shown in FIG. 1, on the upstream side of each printing unit 30 in the conveyance direction of the substrate W, a first coating that applies a coating agent to the substrate W supplied by the paper supply unit 10. A portion 70 is provided. Specifically, such a first coating unit 70 is provided in the infeed unit 20. Here, the first coating unit 70 is in contact with both surfaces of the substrate W, and a pair of roll coaters 72 that apply the coating agent to each surface of the substrate W, and the roll coaters 72. It has a pair of pans 74 that are provided correspondingly and store a coating agent that is applied to each surface of the substrate W by the roll coater 72. Here, each roll coater 72 is immersed in the coating agent stored in each pan 74, and is brought into contact with the printing material W by a cylinder (not shown) and a retreating position separated from the printing material W. 1 is moved back and forth in the direction of the arrow in FIG.

  Each pan 74 is provided with a coating agent supply pipe 75 that sends the coating agent to the pan 74, and a coating agent reservoir 78 is provided at the base end of these coating agent supply pipes 75. It is connected. Each coating agent supply pipe 75 is provided with a pump 76, and these pumps 76 supply the coating agent from the coating agent reservoir 78 to each pan 74. The conveyance amount of the coating agent by each pump 76 is controlled by a control unit 90 described later.

  In the example shown in FIG. 1, the aspect in which the pair of roll coaters 72 is used in the first coating unit 70 has been described, but the present invention is not limited to such an aspect. As the first coating unit 70, a coater having another configuration such as a size press coater, a gate roll coater, a blade coater, a bar coater, a gravure coater, a die coater, a curtain coater, or a spray coater may be used instead of the roll coater. . Here, in consideration of the coating accuracy of the coating agent on the substrate W and the operational aspect, it is preferable to use a roll coater or a blade coater as the first coating unit 70.

  Examples of the coating agent applied to the substrate W by the first coating unit 70 include a resin solution such as a styrene acrylic resin aqueous solution, a styrene resin aqueous solution, a vinyl chloride acrylic resin aqueous solution, and a cellulose nanofiber aqueous solution. Since the coating agent is applied to the printing material W, the physical properties of the printing material W are improved. Specifically, when coated paper is used as the material to be printed W, ink penetration into the coated paper is suppressed by closing the voids on the surface of the coated paper by applying a resin solution as a coating agent. As a result, it is possible to improve the color development and obtain a printed matter having a high printing density with a smaller amount of ink.

  Further, as shown in FIG. 1, a drying unit 79 is provided on the downstream side of the first coating unit 70 in the conveyance direction of the substrate W, and the first coating unit 70 applies the coating agent. A drying process is performed by the drying unit 79 on the processed printing material W. Specifically, the drying unit 79 performs hot air drying, UV drying, IR drying, and the like on the printing material W coated with the coating agent.

  The physical properties of the printing material W (specifically, the coating agent film) coated with the coating agent by the first coating unit 70 on the further downstream side of the drying unit 79 in the conveyance direction of the printing material W. A detection sensor 96 for detecting the thickness, air permeability, smoothness, etc.) may be provided. Information detected by the detection sensor 96 is sent to a control unit 90 described later.

  As shown in FIG. 1, a coating agent for giving gloss to the printing material W supplied by the paper supply unit 10 is provided on the downstream side of each printing unit 30 in the conveyance direction of the printing material W. A second coating unit 80 for coating W is provided. Specifically, the second coating unit 80 is provided in the web path unit 50. Here, the second coating unit 80 is in contact with both surfaces of the substrate W to be coated, and a pair of roll coaters 82 that respectively apply a coating agent to each surface of the substrate W, and each roll coater 82. And a pair of pans 84 for storing a coating agent to be applied to each surface of the substrate W by the roll coater 82. Each pan 84 is provided with a coating agent supply pipe 85 that sends the coating agent to the pan 84, and a coating agent reservoir 88 is provided at the base end of these coating agent supply pipes 85. It is connected. Each coating agent supply pipe 85 is provided with a pump 86, and the coating agent is supplied from the coating agent reservoir 88 to each pan 84 by these pumps 86. The conveyance amount of the coating agent by each pump 86 is controlled by a control unit 90 described later.

  In the example shown in FIG. 1, the aspect in which the pair of roll coaters 82 is used in the second coating unit 80 has been described, but the present invention is not limited to such an aspect. As the second coating unit 80, a coater having another configuration such as a size press coater, a gate roll coater, a blade coater, a bar coater, a gravure coater, a die coater, a curtain coater, or a spray coater may be used instead of the roll coater. . Here, it is preferable to use a roll coater or a blade coater as the second coating unit 80 in consideration of the coating accuracy and operational aspect of the coating agent on the substrate W.

  For example, a styrene acrylic resin aqueous solution or an alkyd resin solution is used as a coating agent applied to the printing material W by the second coating unit 80, specifically, a coating agent that gives gloss to the printing material W. By applying such a coating agent to the printing material W, the printing material W is given gloss.

  As shown in FIG. 1, a drying unit 89 is provided on the downstream side of the second coating unit 80 in the conveyance direction of the substrate W, and a coating agent is applied by the second coating unit 80. A drying process is performed by the drying unit 89 on the processed printing material W. Specifically, the drying unit 89 performs hot air drying, ultraviolet drying, infrared drying, and the like on the printing material W coated with the coating agent.

  The physical properties of the printing material W (specifically, the coating agent film) coated with the coating agent by the second coating unit 80 on the further downstream side of the drying unit 89 in the conveyance direction of the printing material W. A detection sensor 98 that detects a thickness, a glossiness, etc.) may be provided. Information detected by the detection sensor 98 is sent to a control unit 90 described later.

  As shown in FIG. 1, the offset printing machine according to the present embodiment includes a control unit 90 that controls each component of the offset printing machine, and an operation for applying a coating agent to the substrate W. Input means 94 is provided for the operator to input various commands and information to the storage unit 92 and the control unit 90 for storing information relating to data. Here, the control unit 90 is composed of, for example, a PC (personal computer) or a PLC (programmable logic controller), and such a control unit 90 may be used as a stand-alone type or the first coating unit. 70 and the second coating unit 80 may be communicably connected to adjust the control amounts of the first coating unit 70 and the second coating unit 80. In yet another aspect, the control unit 90 may be connected to the pump 76 or the pump 86 so as to adjust the transport amount of the coating agent by the pump 76 or the pump 86. Details of the configuration of the control unit 90, the storage unit 92, and the input unit 94 will be described below.

  In the storage unit 92, for each of a plurality of types of coating agents, the printing date and time, weather, temperature, humidity, and coating agent as coating operation data based on the past printing process of the offset printing press. Information including coating amount, printing density, coating material cost (ie, coating amount multiplied by unit price), glossiness, air permeability, smoothness, etc. is stored. ing. An example of information stored in the storage unit 92 (specifically, for example, operation data of the coating process related to the coating agent A) is shown in the table of FIG.

  Based on the information stored in the storage unit 92, the control unit 90 outputs information on the application conditions of the coating agent on the printing material W by the first coating unit 70 and the second coating unit 80. It is like that. Here, as the information regarding the coating condition of the coating agent output by the control unit 90, for example, the type of coating agent, the coating amount of the coating agent, the first coating unit 70 and the second coating agent The control amount of the coating part 80 etc. are mentioned.

  The case where the information regarding the coating condition of the coating agent output by the control unit 90 is the type of the coating agent will be described below with reference to FIGS. 3 and 4.

  The storage unit 92 shows the relationship between the coating amount of the coating agent and the printing density, in addition to the information related to the operation data of the coating process using a plurality of types of coating agents as shown in the table of FIG. Relational expressions are stored for each of a plurality of types of coating agents. Such a relational expression showing the relationship between the coating amount of the coating agent and the printing density can be shown as a calibration curve composed of a straight line or a curve in the graph shown in FIG. In addition, instead of storing such a relational expression in the storage unit 92 for each of a plurality of types of coating agents, the control unit 90 applies the coating as shown in the table of FIG. Based on the information related to the processing operation data, a relational expression indicating the relation between the coating amount of the coating agent and the printing density is obtained by regression analysis such as a least square method, and the relational expression calculated by the control unit 90 is obtained. It may be used.

  Before starting the printing process with the offset printing press as shown in FIG. 1, the operator uses the input means 94 to print information on the desired print density of the printed material obtained by the printing process, that is, print the printed material that satisfies the printing quality. Input the density (displayed by the item “quality required” in the graph of FIG. 3). When such information is input by the input means 94, the control unit 90 applies the coating amount and printing of the coating agent for a plurality of types of coating agents (for example, coating agent A and coating agent B). The coating amount of the coating agent corresponding to the input print density (specifically, coating amount a for coating agent A and coating amount for coating agent B) based on the relational expression indicating the relationship with the density. The quantity b) is calculated. And the control part 90 selects and outputs the kind of coating agent (namely, coating agent B) with the least coating amount of a coating agent as an optimal kind of coating agent. The output information is displayed on a display unit such as a monitor provided in the vicinity of the offset printing machine, for example, and the operator can select the first coating unit 70 and the first coating unit based on the information displayed on the display unit. The type of coating agent actually used in the second coating unit 80 (coating agent B in the above example) is selected.

  Note that in a multicolor offset printing press as shown in FIG. 1, the print density of the printed matter is different for each color. Therefore, the operation of calculating the coating amounts of a plurality of coating agents using a relational expression indicating the relationship between the coating amount of the coating agent and the printing density as shown in the graph of FIG. 3 is performed for each color. Will come to be. Then, the control unit 90 considers the calculated coating amount in each color coating agent, and specifically refers to the smallest coating amount of the coating agent in each color, for example, to determine the optimum coating agent. The type of will be selected.

  Further, when the control unit 90 outputs the type of coating agent as information on the coating condition of the coating agent, the relationship between the coating amount of the coating agent and the printing density as shown in the graph of FIG. 3 is shown. Instead of using the relational expression, a relational expression showing the relationship between the coating material cost of the coating agent (that is, the product amount multiplied by the coating amount of the coating agent) and the printing density may be used. Such an aspect will be described with reference to the graph of FIG.

  In the storage unit 92, in addition to the information related to the operation data of the coating process using a plurality of types of coating agents as shown in the table of FIG. 2, the relationship between the coating material cost of the coating agent and the print density The relational expressions shown are stored for each of a plurality of types of coating agents. The relational expression indicating the relationship between the coating material cost of such a coating agent and the printing density can be shown as a calibration curve including a straight line or a curve in the graph shown in FIG. In addition, instead of storing such a relational expression in the storage unit 92 for each of a plurality of types of coating agents, the control unit 90 applies the coating as shown in the table of FIG. Based on the information relating to the operation data of the processing, a relational expression indicating the relation between the coating material cost of the coating agent and the printing density is obtained by regression analysis such as a least square method, and the relational expression calculated by the control unit 90 May be used.

  Before starting the printing process with the offset printing press as shown in FIG. 1, the operator uses the input means 94 to print information on the desired print density of the printed material obtained by the printing process, that is, print the printed material that satisfies the printing quality. Input the density (displayed by the item “quality required” in the graph of FIG. 4). When such information is input by the input unit 94, the control unit 90 determines the coating material cost of the coating agent for a plurality of types of coating agents (for example, coating agent A and coating agent B). Based on the relational expression indicating the relationship with the printing density, the coating material cost of the coating agent corresponding to the input printing density (specifically, the coating material cost c for the coating agent A, the coating agent B) Then, the coating material cost d) is calculated. And the control part 90 selects and outputs the kind of coating agent (namely, coating agent A) with the least coating material cost as an optimal kind of coating agent. The output information is displayed on a display unit such as a monitor provided in the vicinity of the offset printing machine, for example, and the operator can select the first coating unit 70 and the first coating unit based on the information displayed on the display unit. The type of coating agent actually used in the second coating unit 80 (coating agent A in the above example) is selected.

  Next, the case where the information regarding the coating condition of the coating agent output by the control unit 90 is the coating amount of the coating agent will be described. In the example shown below, the case where the information on the coating condition of the coating agent is the coating amount of the coating agent in the first coating unit 70 is described, but the information on the coating condition of the coating agent is described. The same operation is performed when the coating amount of the coating agent in the second coating unit 80 is reached.

  The control unit 90 uses the relational expression indicating the relationship between the coating amount of the coating agent and the printing density as shown in the graph of FIG. 3 to determine the optimum coating agent as information on the coating condition of the coating agent. When the type is selected and output, information on the coating amount of the selected coating agent (the coating amount b of the coating agent B in the example shown in the graph of FIG. 3) is also output. When the control unit 90 is connected to the pump 76, the control unit 90 adjusts the transport amount of the coating agent by the pump 76 based on the outputted coating amount of the coating agent. That is, the amount of the coating agent stored in each pan 74 is reduced by applying a predetermined coating amount of the coating agent on the substrate W by the pair of roll coaters 72, but each pump 76 reduces the amount of the coating agent. The coating agent is always stored in each pan 74 by transporting the coating agent from the coating agent storage unit 78 to each pan 74 by the coating agent supply pipe 75 with the transport amount adjusted as described above. It will be possible to maintain the state.

  When the detection sensor 96 is provided on the downstream side of the drying unit 79 in the conveyance direction of the substrate W, the control unit 90 detects information detected by the detection sensor 96, specifically, the first coating unit. Referring to the physical properties (specifically, the film thickness, air permeability, smoothness, etc. of the coating agent) of the substrate W to which the coating agent is applied by 70, the coating agent is conveyed by each pump 76. The amount may be adjusted. In this case, the state of the substrate W to which the coating agent is applied by the first application unit 70 can be further improved.

  Next, the case where the information regarding the coating conditions of the coating agent output by the control unit 90 is the control amount of the first coating unit 70 or the second coating unit 80 will be described. In the example shown below, the case where the information regarding the coating condition of the coating agent is the control amount of the first coating unit 70 will be described. However, the information regarding the coating condition of the coating agent is the second coating level. The same operation is performed when the control amount of the unit 80 is used.

  The control unit 90 uses the relational expression indicating the relationship between the coating amount of the coating agent and the printing density as shown in the graph of FIG. 3 to determine the optimum coating agent as information on the coating condition of the coating agent. When the type is selected and output, information on the coating amount of the selected coating agent (the coating amount b of the coating agent B in the example shown in the graph of FIG. 3) is also output. And when the control part 90 is connected to the 1st coating part 70, the said control part 90 of the 1st coating part 70 is based on the coating amount of this output coating agent. Adjust the control amount. Specifically, when the first coating unit 70 has a pair of roll coaters 72, the coating applied to the substrate W is adjusted by adjusting the rotation speed of these roll coaters 72. The coating amount of the working agent is set to a predetermined amount. Or you may use the density | concentration of the coating agent applied to the to-be-printed material W with the roll coater 72 as a control amount of the 1st coating part 70. FIG. Specifically, when the concentration of the coating agent applied to the printing material W by the roll coater 72 is suppressed, the coating agent is diluted with water or a solvent. In this way, the control unit 90 adjusts the control amount of the first coating unit 70, so that the substrate W after the coating agent is applied by the first coating unit 70 has a desired quality. To be able to do things.

  When the detection sensor 96 is provided on the downstream side of the drying unit 79 in the conveyance direction of the substrate W, the control unit 90 detects information detected by the detection sensor 96, specifically, the first coating unit. Control of the first coating unit 70 with reference to the physical properties (specifically, the film thickness, air permeability, smoothness, etc. of the coating agent) of the substrate W to which the coating agent is applied by 70 The amount, specifically, the rotational speed of each roll coater 72 or the concentration of the coating agent applied to the printing material W by the roll coater 72 may be adjusted. In this case, the state of the substrate W to which the coating agent is applied by the first application unit 70 can be further improved.

  Next, the operation of the offset printing machine having such a configuration will be described.

  Before starting the printing process using the offset printing press as shown in FIG. 1, the operator inputs information on the desired print density of the printed material obtained by the printing process, that is, the print density of the printed material that satisfies the print quality. Then, the control unit 90, based on the operation data of the coating process using a plurality of types of coating agents stored in the storage unit 92, a relational expression or a coating material indicating the relationship between the coating amount and the printing density By using a relational expression indicating the relationship between the cost and the printing density, the optimum type of coating agent is selected and output. Information output by the control unit 90 is displayed on a display unit such as a monitor, for example, and the operator can use the first coating unit 70 and the second coating unit 80 based on the information displayed on the display unit. The type of coating agent that is actually used is selected so that the type of coating agent selected by the operator is supplied to the first coating unit 70 and the second coating unit 80.

  Note that the operator may input information relating to the environment of the printing site, specifically, for example, temperature and temperature, using the input unit 94 before starting the printing process using the offset printing press as shown in FIG. . In this case, the control unit 90 is the operation data that approximates the temperature or temperature input by the input means 94 among the operation data of the coating process using a plurality of types of coating agents stored in the storage unit 92. Using only the above formula, a relational expression indicating the relation between the coating amount and the printing density and a relational expression indicating the relation between the coating material cost and the printing density are created, and the optimum coating is performed based on the created relational expression. Select the type of agent and output.

  Further, the control unit 90 outputs the coating amount of the coating agent as the coating condition of the coating agent to the printing material W by the first coating unit 70 and the second coating unit 80. Specifically, for the optimum type of coating agent selected by the control unit 90, the input unit 94 is input based on the relational expression indicating the relationship between the coating amount of the coating agent and the printing density. The controller 90 outputs the coating amount of the coating agent corresponding to the desired printing density. Then, the control unit 90 adjusts the transport amount of the coating agent by the pump 76 and the pump 86 based on the output coating amount of the coating agent.

  In addition, the control unit 90 includes the first coating unit 70 and the second coating unit as the coating conditions of the coating agent to the printing material W by the first coating unit 70 and the second coating unit 80. A control amount of 80 is output. Specifically, the control unit 90 relates to the first coating unit 70 and the first coating unit based on the coating amount of the output coating agent with respect to the optimum type of coating agent selected by the control unit 90. The control amount of the second coating unit 80 is adjusted. Specifically, when the first coating unit 70 and the second coating unit 80 have a pair of roll coaters 72, 8, the rotational speed of these roll coaters 72, 82 or the roll coater. By adjusting the concentration of the coating agent applied to the printing material W in 72 and 82, the coating amount of the coating agent applied to the printing material W is set to a predetermined amount. Thereby, the to-be-printed material W after a coating agent is coated by the 1st coating part 70 or the 2nd coating part 80 can be made into the thing of desired quality.

  In addition, when the detection sensor 96 and the detection sensor 98 are provided in the offset printing press according to the present embodiment, the control unit 90 detects the detection sensor 96 and the detection while the printing process is performed by the offset printing press. Information detected by the sensor 98, specifically, physical properties of the printing material W coated with the coating agent by the first coating unit 70 or the second coating unit 80 (specifically, a film of the coating agent) Thickness, glossiness, air permeability, smoothness, etc.), the amount of coating agent transported by each pump 76 and each pump 86, and the control of the first coating unit 70 and the second coating unit 80. The amount may be adjusted. In this case, the control unit 90 performs feedback control, so that the transport amount of the coating agent by each pump 76 or each pump 86 or the first coating unit 70 or the second coating is performed according to the actual printing situation. Since the control amount of the processing unit 80 can be adjusted, the printing quality of the substrate W can be further improved.

  According to the offset printing press and the printing method of the present embodiment having the above-described configuration, the printing material W supplied by the paper supply unit 10 is applied to the upstream side of the printing unit 30 in the conveyance direction of the printing material W. A first coating unit 70 for coating the coating agent is disposed, the coating process of the coating agent on the printing material W by the first coating unit 70, and the printing on the printing material W by the printing unit 30. An in-line method is used in which processes are performed continuously. As described above, in performing the in-line printing, the printing material W is coated with the coating agent by the first coating unit 70 before printing on the printing material W by the printing unit 30. Thus, it is possible to obtain a printed matter having a high printing density with a smaller amount of ink. In particular, when coated paper is used as the printing material W in offset printing, by applying a resin, the gap on the surface of the paper is closed, and the ink penetration into the printing material W is suppressed, so that the color development is improved and less. A printed matter with a high printing density can be obtained by the amount of ink.

  Further, in the offset printing machine of the present embodiment, as described above, the coating agent is on the upstream side of the printing unit 30 in the conveyance direction of the substrate W and on the downstream side of the first coating unit 70. A drying unit 79 for drying the coated substrate W is provided. Thereby, since the to-be-printed material W coated with the coating agent before being sent to the printing unit 30 can be sufficiently dried, the coating agent coated on the to-be-printed material W is still sufficiently dried. It is possible to prevent the substrate W from being sent to the printing unit 30 in a state where the printing is not performed.

  Further, in the offset printing machine of the present embodiment, as described above, the control unit 90 is provided that outputs information related to the coating condition of the coating agent to the printing material W by the first coating unit 70. Yes. As a result, the state of the coating agent applied to the printing material W can be made as desired, so that the physical properties of the printing material W can be improved. A printed matter having a high printing density can be obtained.

  Further, in the offset printing machine according to the present embodiment, as described above, the storage unit 92 that stores information related to the operation data of the coating processing of the coating agent to the printing material W is provided, and the control unit Reference numeral 90 is configured to output information related to the application conditions of the coating agent on the substrate W by the first coating unit 70 based on the information stored in the storage unit 92. In this case, since the control unit 90 can use the information related to the operation data of the coating processing of the coating agent to the printing material W stored in the storage unit 92, the actual past in the offset printing press can be utilized. By using the operation data, the physical properties of the printing material W to be printed can be more reliably improved, and thus the printing quality can be further improved. Here, the memory | storage part 92 memorize | stores at least 1 thing in the group which consists of the coating amount of a coating agent, printing density, coating material cost, air permeability, smoothness, temperature, and humidity as operation data. It is like that.

  Further, the coating conditions output by the control unit 90 may be the type of coating agent. In this case, the storage unit 92 is configured to store information related to operation data of coating processing using a plurality of types of coating agents, and the control unit 90 is based on the information stored in the storage unit 92. The optimum type of coating agent is selected and output. At this time, the storage unit 92 stores a relational expression indicating the relationship between the coating amount and the print density for each of a plurality of types of coating agents. Based on the relational expression stored in the section 92, the coating agent having the smallest coating amount corresponding to the required printing density may be selected as the optimum coating agent. As another aspect, the storage unit 92 is configured to store a relational expression indicating the relationship between the coating material cost and the print density for each of a plurality of types of coating agents. Based on the relational expression stored in the storage unit 92, a coating agent with the least coating material cost corresponding to the required printing density may be selected as the optimum coating agent.

  The coating condition output by the control unit 90 may be the coating amount of the coating agent. In this case, the offset printing machine of the present embodiment is provided with a pump 76 for supplying the coating agent to the first coating unit 70, and the control unit 90 determines the output coating agent. The transport amount of the coating agent by the pump 76 is adjusted based on the coating amount. Further, when the detection sensor 96 that detects the state of the printing material W coated with the coating agent by the first coating unit 70 is provided, the control unit 90 is detected by the detection sensor 96. Even if the transport amount of the coating agent by each pump 76 is adjusted with reference to the state of the substrate W (specifically, the film thickness, air permeability, smoothness, etc. of the coating agent). Good.

  Further, the coating condition output by the control unit 90 may be a control amount of the first coating unit 70. In this case, the first coating unit 70 has a roll coater 72, and the controlled amount of the first coating unit 70 is the rotation speed of the roll coater 72 or the coating applied to the substrate W with the roll coater 72. It may be the concentration of the working agent. Further, when the detection sensor 96 that detects the state of the printing material W coated with the coating agent by the first coating unit 70 is provided, the control unit 90 is detected by the detection sensor 96. The control amount of the first coating unit 70 may be adjusted with reference to the state of the substrate W (specifically, the film thickness, air permeability, smoothness, etc. of the coating agent). .

  Further, in the offset printing machine according to the present embodiment, as described above, gloss is given to the substrate W printed by the printing unit 30 on the downstream side of the printing unit 30 in the conveyance direction of the substrate W. You may provide the 2nd coating part 80 which coats the said to-be-printed material W of this coating agent. In this case, it is possible to give a desired gloss to the printed material W on which printing has been performed, and thus it is possible to give a high-class feeling to the printed material W on which printing has been performed.

  In this case, the control unit 90 may output information related to the application conditions of the coating agent to the printing material W by the second coating unit 80. Here, the coating conditions output by the control unit 90 are the kind of coating agent that gives the printed material W gloss, the coating amount of the coating agent, or the control amount of the second coating unit 80. There may be. The storage unit 92 is configured to store information related to the operation data of the coating processing of the coating agent to the printing material W relating to the second coating unit 80. As the operation data, the coating agent is stored. At least one of a group consisting of coating amount, coating material cost, glossiness, temperature, and humidity may be used. In this case, based on the information stored in the storage unit 92, the control unit 90 outputs information related to the coating condition of the coating agent on the substrate W by the second coating unit 80. Also good.

  Note that the offset printing press and the printing method according to the present embodiment are not limited to the above-described aspects, and various modifications can be made.

  For example, in the offset printing machine according to the present embodiment, the installation of the second coating unit 80 is not essential, and the installation of the second coating unit 80 may be omitted. Even in this case, the physical properties of the printing material W can be improved by applying the coating agent to the printing material W by the first coating unit 70 before printing on the printing material W by the printing unit 30. Therefore, a printed matter having a high printing density can be obtained with a smaller amount of ink.

  Further, in the offset printing machine according to the present embodiment, the control unit 90 does not necessarily require the first coating unit 70 to apply the coating agent to the printing material W (specifically, the type of coating agent, the coating agent). It is not necessary to output information on the coating amount of the working agent or the control amount of the first coating unit 70). Even when the control unit 90 does not output information on the coating conditions of such a coating agent, by installing the first coating unit 70 at least on the upstream side of the printing unit 30 in the transport direction of the substrate W, The physical properties of the material to be printed W can be improved. For this reason, a printed material having a high printing density can be obtained with a smaller amount of ink.

  Further, the printing press according to the present invention is not limited to the offset printing press as shown in FIG. As the printing machine according to the present invention, a printer other than the offset printing machine such as a gravure printing machine or a flexographic printing machine may be used.

DESCRIPTION OF SYMBOLS 10 Paper feed part 20 Infeed part 22 Compensator roller 30 Printing unit 40 Drying device 50 Web path part 52 Compensator roller 60 Folding machine 70 First coating part 72 Roll coater 74 Pan 75 Coating agent supply pipe 76 Pump 78 Coating agent Storage unit 79 Drying unit 80 Second coating unit 82 Roll coater 84 Pan 85 Coating agent supply pipe 86 Pump 88 Coating agent storage unit 89 Drying unit 90 Control unit 92 Storage unit 94 Input means 96 Detection sensor 98 Detection sensor

Claims (20)

A paper feed unit for supplying a belt-shaped substrate;
A printing unit that performs printing on the substrate supplied by the paper feeding unit;
A coating unit that is provided on the upstream side of the printing unit in the conveyance direction of the substrate, and that applies a coating agent to the substrate to be supplied by the paper feeding unit;
With
A printing machine using an in-line method in which a coating process of a coating agent on the printing material by the coating unit and a printing process on the printing material by the printing unit are continuously performed.   A drying unit for drying the printing material coated with a coating agent is provided on the upstream side of the printing unit in the conveyance direction of the printing material and on the downstream side of the coating unit. Item 1. A printing machine according to item 1.   The printing machine according to claim 1, further comprising a control unit that outputs information related to a coating condition of the coating agent on the printing material by the coating unit. A storage unit for storing information related to operation data of the coating process of the coating agent on the substrate;
4. The printing machine according to claim 3, wherein the control unit outputs information related to a coating condition of a coating agent on the printing material by the coating unit based on information stored in the storage unit.   The storage unit stores, as the operation data, at least one of a group consisting of a coating amount of a coating agent, a printing density, a coating material cost, an air permeability, a smoothness, a temperature, and humidity. Item 5. The printing machine according to item 4.   The printing machine according to claim 3 or 4, wherein the coating condition is a type of coating agent. The storage unit is configured to store information related to the operation data of a coating process using a plurality of types of coating agents,
The printing machine according to claim 6, wherein the control unit selects and outputs an optimum type of coating agent based on information stored in the storage unit. The storage unit is configured to store a relational expression indicating a relationship between a coating amount and a printing density for each of a plurality of types of coating agents,
The said control part selects the coating agent with the least coating amount corresponding to the required printing density as an optimal coating agent based on the relational expression memorize | stored in the said memory | storage part. Printing machine. The storage unit is configured to store a relational expression indicating a relationship between a coating material cost and a printing density for each of a plurality of types of coating agents,
The said control part selects the coating agent with the least coating material cost corresponding to the required printing density as an optimal coating agent based on the relational expression memorize | stored in the said memory | storage part. The printing machine described.   The printing machine according to claim 3 or 4, wherein the coating condition is a coating amount of a coating agent. A pump for supplying a coating agent to the coating unit;
The printing machine according to claim 10, wherein the control unit adjusts the transport amount of the coating agent by the pump based on the output coating amount of the coating agent. A detection unit for detecting a state of the printing material coated with a coating agent by the coating unit;
The printing machine according to claim 11, wherein the control unit is configured to adjust a conveyance amount of the coating agent by the pump with reference to a state of the printing material detected by the detection unit.   The printing machine according to claim 3 or 4, wherein the coating condition is a control amount of the coating unit.   The printing machine according to claim 13, wherein the coating unit has a roll coater, and a control amount of the coating unit is a rotation speed of the roll coater.   The printing machine according to claim 13, wherein the control amount of the coating unit is a concentration of a coating agent. A detection unit for detecting a state of the printing material coated with a coating agent by the coating unit;
The said control part adjusts the control amount of the said coating part with reference also to the state of the said to-be-printed material detected by the said detection part. Printer.   Additional coating that is provided on the downstream side of the printing unit in the conveyance direction of the printing material and that coats the printing material to give gloss to the printing material that has been printed by the printing unit The printing machine according to claim 1, further comprising a section.   The printing machine according to claim 17, further comprising a control unit that outputs information relating to a coating condition of the coating agent on the printing material by the additional coating unit. Further comprising a storage unit that stores information related to operation data of the coating process of the coating agent to the printing material, the storage unit as the operation data, coating amount of the coating agent, coating material costs, At least one of the group consisting of gloss, temperature, and humidity is memorized,
The printing machine according to claim 18, wherein the control unit outputs information related to a coating condition of a coating agent on the printing material by the additional coating unit based on information stored in the storage unit. Supplying a belt-like printed material by a paper feeding unit;
Applying a coating agent by a coating unit to the printing material supplied by the paper feeding unit;
A step of performing printing by a printing unit on the substrate to be coated with a coating agent by the coating unit;
With
A printing method using an in-line method in which a coating process of a coating agent on the printing material by the coating unit and a printing process on the printing material by the printing unit are continuously performed.

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