JP3134468B2 - Printing paper processing method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for processing printing paper which requires folding on printing paper on which printing has been completed. More particularly, the present invention relates to a method for removing ink on a printing surface after printing on printing paper. After drying, in a method of processing printing paper in which a folding line portion (a portion to be subjected to folding processing) is folded, a liquid is supplied to the folding line portion of the printing paper in a fine width before the folding process and humidified. The present invention relates to a method and an apparatus for processing printing paper, characterized in that folding is performed along the humidified folding line portion.

[0002]

2. Description of the Related Art Conventionally, a printing method for printing on printing paper, drying the printing surface of the printing paper, and then folding the folded portion of the printing paper includes a rotary printing press, a printing press, Machines such as leaf printing machines and folding devices are used.
For example, offset rotary printing presses and gravure rotary printing presses are widely used as printing presses in which a printing unit and a folding unit are connected for the purpose of high-speed, large-volume printing. ) Is set in the supply unit, the web is sent from the supply unit to the printing unit, and the printing unit prints on the front or back of the web, and then the printing ink is dried in the drying unit, and is composed of a triangle plate and the like. After being folded and cut by the folding unit (hereinafter referred to as signature), the paper is discharged.

[0003] In these printing presses, it is necessary to dry the printed ink promptly so as not to cause printing defects such as rubbing of the ink at the time of folding, and a drying unit is provided between the printing unit and the folding unit. The ink is heated at a high temperature by spraying the ink onto a web body to forcibly evaporate a solvent component to dry the ink. However, in most cases, the material of the web is paper, and as a result of heating at a high temperature in the drying unit together with the ink, the water inside the paper evaporates simultaneously with the evaporation of the solvent component of the ink. As a result, various defects such as cracks in the back, blisters, wrinkles, dimensional expansion of the paper after cutting, and misalignment of the signatures discharged by static electricity occurred.

[0004] In particular, the back crack loses the flexibility of the paper fiber due to the lack of moisture, and when the paper is folded in a folding step which is a post-drying step, the paper cracks at the fold, that is, at the folded part. This is a phenomenon where fibers are cut. If the signature has a broken back, when binding a book in the bookbinding process, especially when binding with a needle etc. at the fold part like a saddle stitch book, the pages of the book drop off after bookbinding, or There was a problem that the book itself was disassembled. To solve these problems, Japanese Patent Publication No. 61-5983 discloses an apparatus and a method for preventing cracks, in which a printed paper is passed through a drying device, and a water-containing porous material is pressed against a folded portion of the paper to give moisture. Japanese Patent Application Laid-Open No. HEI 2-11547 discloses an apparatus and a method for applying moisture to a folded line portion by using a spray device. In other words, a method of supplying moisture to the folded line portion of the paper and humidifying it before folding the printed paper partially recovers the flexibility of the fiber and prevents the back crack.

[0005] However, both the method of pressing a humidified porous material containing water and humidifying the fold line and the method of humidifying the fold line by a spraying device are 10-30.
Water is given to the folding line with a width of mm, and no consideration is given to improving the folding accuracy, so that even if the planned folding line and the actually folded fold are displaced, it will be in the humidified range It was wide and humidified, and the folding accuracy relied solely on the mechanical accuracy of the folding unit. In particular,
The method of giving water to a fold portion by a spraying device, which is generally widely practiced, is a method of applying air pressure to water and ejecting it in a mist state, and supplying water widely and uniformly along a folding line portion, When trying to reduce the supply width of water, water could not be sprayed but dripped, and humidification itself could not be performed.
In addition, spraying has a large effect on the machinery and equipment itself, such as unnecessary moisture adhering to the machinery and generating rust, and furthermore, the moisture adheres to the printed pattern portion other than the folded line portion, causing printing failure, There are also problems such as that the device itself is expensive, large equipment such as a pressurized tank is required to increase the water pressure, and it is necessary to add an additive to water.

Further, in the above method, the liquid supply amount is not controlled by the printing speed, and the liquid supply amount per unit size of the printing paper varies depending on the printing speed, and as a result, the width of the liquid supplied to the printing paper is changed. Fluctuated greatly, and even if folding was performed along the humidified folding line portion, improvement in folding accuracy could not be expected. Furthermore, in the above-mentioned method, the liquid supply interval is not controlled by the printing speed, and in many cases, it is impossible to supply the liquid at a constant interval. For this reason, when a print pattern is present at the folded line portion of the printing paper, the liquid is supplied to the print pattern portion, and printing defects such as ink bleeding have occurred.

Furthermore, conventionally, instead of the heating and drying method,
UV drying method, infrared drying method, oxidation polymerization drying method,
Even in a printing machine employing the ink penetration drying method, the problem of back cracking does not occur, but the folding accuracy relies on the mechanical accuracy of the folding unit or the folding device as described above. However, the operating speed of printing presses, especially rotary printing presses, has been improving year by year, and the processing capacity of folding units and folding devices has been increasing in accordance with the operating speed. At present, the processing capacity cannot keep up. For example, the efficiency of a rotary printing press is determined by the processing capacity of a folding unit.

[0008] On the other hand, the demand for improving the quality of printed matter produced by a printing press has been increasing year by year, and the demand for improving the folding accuracy has also increased. The folding unit is ±
(Approximately 0.75 mm), the request cannot be answered. For example, in the case of a double-page spread (a page in which the left and right pages are connected to form a single pattern), there is a problem in that the positions of the left and right patterns are misaligned and the degree of connection of the patterns is poor. Had become. Also, the method of improving the folding accuracy by lowering the operation speed is difficult to implement because the processing capacity of the folding unit and the folding device itself is lower than that of the printing press, so that the efficiency is largely reduced as a whole.

[0009]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to solve the above-mentioned drawbacks of the prior art. After the printing on the printing paper is completed, the ink on the printing surface is dried, and then the folding line portion (folding portion) is formed. In the method of processing printing paper that folds the part to be processed), the folding accuracy is improved without any reduction in efficiency, and in a printing machine using a heating and drying method, humidification is performed on the fold line part. An object of the present invention is to provide a method and an apparatus for preventing a back crack.

[0010]

In order to achieve the above object, the present invention is directed to a method for printing on a printing paper, drying the printing surface of the printing paper, and then printing the printing paper. In the method for processing printing paper, in which the paper is folded, before folding, 0.2 to 2..
A method in which a liquid is supplied with a fine width of 0 mm and humidified, and then a folding process is performed along the humidified folding line portion, wherein the supply amount of the liquid is controlled according to the operation speed of the printing press. Thus, the method for processing printing paper is characterized in that the fine width is kept constant. The invention according to claim 2 is characterized in that the liquid is supplied only to a predetermined position on the printing paper by controlling a supply interval of the liquid according to the operation speed. This is also a method for processing printing paper. According to a third aspect of the present invention, there is provided the printing paper processing method according to the first or second aspect, wherein a substance that can be visually identified or detected by a detector is mixed into the liquid.

Further, in the invention according to claim 4, a supply unit for supplying printing paper, a printing unit for printing on the printing paper, a drying unit for drying a printing surface of the printing paper, and a drying unit for drying the printing surface of the printing paper A printing machine having a folding unit for folding or cutting a predetermined portion of a printing sheet, wherein the folding unit is located between the printing unit and the drying unit, between the drying unit and the folding unit, or inside the folding unit. A humidifier for supplying a liquid with a fine width of 0.2 to 2.0 mm to a fold line portion of the printing paper to humidify the liquid; Means for detecting a speed; calculating means for calculating a supply amount of the liquid to be supplied to the printing paper to keep the fine width constant from the detected operation speed; and printing from the nozzle according to the calculation result. Is obtained by the humidifier, characterized in that a control means for controlling the supply amount of the liquid to be supplied to the paper. Further, in the invention according to claim 5, the calculating means calculates a supply amount of the liquid to be supplied to the printing paper, which keeps the fine width constant, and a supply interval to be supplied only to a predetermined position, from the detected operation speed. 5. The humidifying device according to claim 4, wherein the control unit controls a supply amount and a supply interval of the liquid to be supplied from the nozzle to the printing paper according to the calculation result. .

[0012]

According to the present invention, there is provided a printing paper processing method in which printing is performed on a printing paper by a printing machine, a printing surface of the printing paper is dried, and a fold line portion of the printing paper is processed. By supplying liquid to the fold line and humidifying it, the flexibility of the printing paper is increased, and a part that can be easily folded is created in the printing paper. By making the part that can be processed a fine width,
Even if the feeding position of the printing paper to the folding unit or folding device is displaced or tilted during folding, it is most likely to break at the humidified portion with a fine width. Since the correction is made to the humidified part, the deviation or inclination of the printing paper supply position does not affect the actual fold, and the folding accuracy can be improved.At the same time, in the printing machine using the heating and drying method, By supplying and humidifying the liquid, the flexibility of the printing paper can be restored and the back crack can be prevented.

Further, by controlling the supply amount of the liquid in accordance with the operation speed of the printing press, the supply amount of the liquid per unit area of the printing paper becomes constant even if the printing speed fluctuates. Also, the folding width can be kept constant irrespective of the fluctuation of the printing speed by being constant at the minute width.
Furthermore, by controlling the supply interval of the liquid according to the operation speed, the liquid can be supplied to a fixed position on the printing paper even when the printing speed fluctuates, and the printing pattern is present in the folded line portion of the printing paper. Even if the printing speed fluctuates, the liquid is constantly supplied to portions other than the printed picture portion, and printing defects such as ink bleeding do not occur.

Further, a substance which can be visually or identifiably detected by a detector is mixed into the liquid, the liquid is supplied in a fine width to the fold line of the printing paper, and the liquid is humidified. Then, the liquid is folded along the humid fold line. When the processing is performed, an identifiable portion having a fine width is formed on the spine portion of the signature, so that in the next bookbinding process, a random or missing page can be confirmed only by inspecting the spine portion. In particular,
Conventionally, when a wide range of liquid is supplied, if a colorant is mixed in as a visually identifiable substance, the color will appear in the binding part of the page even after bookbinding and printing will be defective, but if supplied in a fine width, the printing will be hidden behind the binding part There is no defect, and if the color material is changed for each signature, it is possible to effectively inspect the incorrect and missing pages.

[0015]

An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic perspective view of the present invention in a rotary printing press. The web (1), which is a printing paper, advances in the direction of arrow A, and a pattern (2) is printed on a printing cylinder (3), which is a printing unit. The web (1) generally has a large amount of paper but may be any material as long as it has hygroscopicity and suitability for folding. The printing cylinder (3) corresponds to, for example, a blanket cylinder in offset printing and a plate cylinder in gravure printing. . The web (1) on which the picture (2) has been printed is dried by blowing hot air in a drying unit (4). (5) is a guide roller for the web (1), (6) is a compensator roller for adjusting the position of the web, (7) is a control motor for adjusting the position of the roller (6), and (8) and (11) are nips. It is a roller.

A photo sensor (9) is provided between the nip rollers (8) and (11) for reading the printing speed and the phase of the printed picture at a predetermined position of the printed picture (2). Identify the timing mark and (1
0) is a rotary encoder linked to the rotation of the nip roller (3) on the downstream side in the web running direction and identifies the printing speed, (14) is a former guide roller, and (13) is the time of the roller (14). It is a detector that detects the number of rotations per hit. The photo sensor (7), the rotary encoder (10) and the detector (13) are each connected to a central processing unit (12), and the central processing unit (12) is connected to a liquid discharge amount control box (15). ing.

The web (1) is vertically folded at a triangular plate (23), which is a folding unit, and a lead-in roller (2).
4) After passing through the nip roller (25), the cutting cylinder (2)
After being cut at a predetermined interval in 6), the sheet is discharged as a signature (27). Of course, a chopper folding device may be provided after the cutting cylinder (26), and the signature (27) may be further folded.

The liquid is supplied from the liquid storage tank (16) to the pump (1).
By 8), it is fed under pressure to the supply pipe (19) through the supply pipe (17) and enters the liquid discharge amount control unit (20). The liquid discharge amount control unit (20) has a voltage-water pressure conversion function, includes an open / close solenoid valve, and controls a liquid supply amount and a supply interval in accordance with an instruction from a liquid discharge amount control box (15) to form a nozzle (21).
Supply liquid to The liquid supplied to the nozzle (21) is discharged to the web (1) that is traveling in the direction of arrow A in a water flow state, and forms a humidified portion (22) having a minute width indicated by a dashed line on the web (1). .

FIG. 2 is an enlarged view of the folding unit. The web (1) is turned by a former guide roller (14) and then pulled by a lead-in roller (24) and a nip roller (25) to enter a triangular plate (23) and folded vertically into two. The triangular plate (23) has a substantially isosceles triangle shape having the vertex (31) as the vertex, and the (31)-(32) line is centered on the vertex (31) so that the paper is not bent with a corner. It is a cone and has a vertex (3
1) also has roundness due to the curve. As a result, the position where the vertex (31) is folded is likely to have a variation,
Further, when the supply position itself to the folding unit or the folding device is displaced or tilted due to the impact of the loading cylinder (26) under the loading, the web (1) is supplied at the actual fold. The displacement and the inclination of the position affect, and the displacement and the inclination occur between the fold line portion to be folded and the actual fold.

In the present invention, before folding the web (1), a liquid is supplied from the nozzle (21) to the web (1) to form a humidified portion having a minute width. The supplied liquid is supplied in the form of a stream of water to the entire folded line portion to form a humidified portion (22) having a minute width indicated by a dashed line on the web (1). The folding line portion, that is, the position where the folding process is performed at the vertex portion (31). The web (1) is most likely to be broken at the humidified portion (22) of the fine width, and the fold is corrected to the humidified portion of the fine width at the time of folding at the vertex (31). It does not affect the position or inclination of the printing paper supply position at the fold,
The folding process is reliably performed at the humidified portion (22) having a very small width. Further, in a printing machine in which the drying unit (4) employs a heat drying method, the liquid is supplied to the folding line portion and humidified, thereby recovering the flexibility of the printing paper and preventing the back crack.

The liquid to be supplied is desirably supplied to the entire folding line portion along the folding line portion, and it is particularly desirable to continuously supply the liquid to improve the folding accuracy. The fine width is
Depends on the required folding accuracy, but 0.2-2.0
mm, preferably about 0.8 to 1.2 mm. Also, it is not necessary to constantly supply the liquid continuously, and within a range that does not greatly affect the folding accuracy,
It may be simply supplied at regular intervals. The fine width is constantly kept constant by controlling the supply amount of the liquid according to the printing speed.

Further, when there is a portion where a printed pattern overlaps the folding line portion, simply supplying the liquid at an interval such that the liquid is not supplied to the portion so as to prevent printing defects beforehand and to improve the folding accuracy. Can be improved. The liquid supply interval is constantly kept constant by controlling it according to the printing speed.

FIG. 3 is a control system diagram of the liquid supply amount and the liquid supply interval. The operation signal of the compensator roller adjustment control motor (7) and the photo sensor ( 9) The timing mark identification signal for reading the printing speed and the phase of the print pattern printed on a predetermined position of the print pattern (2) on the web (1) from the web (1) and the rotation operation of the nip roller (11) and the like. A rotation speed signal from the rotary encoder (10) and a rotation speed signal from a detector (13) for detecting the rotation speed per hour of the former guide roller (14) are input. The central processing unit (12) outputs a liquid supply timing signal and an appropriate liquid supply amount signal to the liquid discharge amount control box (15), and the liquid discharge amount control box (15) sends the signal to the liquid discharge amount control unit (20). An electromagnetic valve opening / closing signal and a water pressure adjustment signal are output to the pump (18), and a pump discharge amount control signal is output to the pump (18).

When calculating the liquid supply timing signal and the appropriate liquid supply amount signal in the central processing unit (12), the simplest method is to classify the operation speed into two patterns of operation and operation stop, and Supplies a fixed amount of liquid (this supply amount can be arbitrarily set as required and can be easily changed) to the web (1), and the operation stop is a method of stopping the supply of the liquid, or an arbitrary method. When the operation speed is higher than the predetermined speed, a certain amount of liquid (this supply amount can be set arbitrarily as needed and can be easily changed) is supplied to the web (1), When the speed is lower than the speed, the liquid supply is stopped. Or, the operation speed is classified into three patterns, that is, the speed is higher than the set speed, the speed is lower than the speed, and the operation is stopped. Liquid supply in each case The liquid was set arbitrarily supplied to the web (1) to, during shutdown and a method of stopping the supply of the liquid.

However, in the above-described method, the supply amount and the supply interval of the liquid are controlled in accordance with the operation speed. However, since the degree of the control is small, the humidification state of the web (1) depends on the operation speed. And the excessively humidified portion is generated, the tensile strength of the printing paper in that portion is reduced, and the web (1) cannot withstand the tension applied to the entire web (1). There is a possibility of breaking, and the width of the humidified portion (22) is also likely to vary. Therefore, it is desirable to finely set the correspondence between the operation speed and the liquid supply amount, or to control the liquid supply amount continuously with respect to the fluctuation of the operation speed. In that case, if the operation is stopped, the supply of liquid is stopped,
As the operation speed increases, the supply amount of the liquid increases, and when the operation speed becomes constant, the supply amount of the liquid also becomes constant. Needless to say, the operation stop includes not only the complete stop but also the case where the operation is performed gently as in the web passing operation before the start of printing.

As a method of changing the supply amount of the liquid according to the operation speed, the amount of liquid absorbed by the web (1) per unit area is measured by an optical means or the like and set arbitrarily. There is also a method of adjusting the supply amount when deviating from the allowable range. As a means for measuring the amount of absorbed liquid, there are a means utilizing variation in light reflectance, a means utilizing variation in light transmittance, a moisture meter used in a paper machine, and the like. And the arbitrarily set allowable range may be compared to determine whether the supply amount of the liquid is large or small, and the supply amount of the liquid from the humidifier may be increased or decreased based on the determination result.

In the present invention, the control motor (7) for adjusting the compensator roller, the nip roller (1)
1) Information on the operating state and operating speed of the printing press is obtained from the signal from the former guide roller (14).
The present invention is not limited to this, and information on the operating state and operating speed may be obtained from appropriate rollers. Further, in the present invention, malfunctions are confirmed by comparing information from a plurality of rollers, but the cost may be reduced by integrating them. In this case, it is preferable that the former guide roller (14) closest to the triangular plate (23) is used to obtain information on the operating state and operating speed of the printing press, but the present invention is not limited to this.

In the present invention, the photo sensor (9)
Is used to identify the phase of the printed picture (2), but the operating speed may be calculated from the identification interval of the timing mark at a predetermined position. As the timing mark, a dedicated mark may be provided, but it may also serve as various identification marks used for other purposes, such as a register mark for registration and a register mark for an automatic register machine. The central processing unit (12) calculates the positional relationship with the timing mark by inputting the position of the pattern portion overlapping the folded line portion in the print pattern (2), and prevents the liquid from being supplied to the portion. A liquid supply interval is set, and a liquid supply timing signal corresponding to the operation speed is output to the liquid discharge amount control box (15).

Furthermore, there is no need to provide a liquid supply portion at one place, and two sheets are stacked (the web is slit in two rows at the center by a rotary printing machine or the like, and then the web is folded and folded. In a printing machine, it is desirable to supply the ink to a plurality of locations as necessary in accordance with folding conditions such as slitting more and then overlapping and folding the slits. In particular, in the case of stacking two or more sheets, all the webs are overlapped with each other and then folded, but the web located in the middle is merely sandwiched between the webs above and below it, and the web located in the middle when folding is folded. Although the folds of the webs to be formed may be deviated from the predetermined fold lines, all the webs can be folded at the predetermined fold lines by supplying the liquid with a fine width for each web.

Further, depending on the conditions such as the material and thickness of the printing paper, the state of the picture to be printed, the place where the liquid supply device is installed, etc., the web may be supplied from above or below the web body, May be supplied. The liquid to be supplied is preferably water, but may be an organic solvent or the like. It is more effective to mix an antistatic agent, a preservative and the like as a mixture.

The signatures (27) are sent to the next bookbinding process in the form of an overlapped bundle. Therefore, even if a signature on another page is mixed, it cannot be easily found.
Therefore, in the present invention, a liquid is mixed with a substance that can be visually or identifiably detected by a detector, and the liquid is supplied in a fine width to the folded line portion of the printing paper and humidified, and then the folding process is performed along the humidified folded line portion. When applied, a recognizable portion having a fine width is formed on the spine portion of the signature, so that in the next bookbinding process, it is possible to confirm the misaligned or missing pages only by inspecting the spine portion. In particular, when a wide range of conventional liquids is supplied, if a coloring material is mixed as a visually identifiable substance, the color will appear at the binding portion of the page even after bookbinding and printing will be defective, but if supplied at a fine width, the binding portion will be damaged. There is no hidden printing failure, and if the color material is changed for each signature, it is possible to visually inspect the missing pages and missing pages effectively.

The colorant is mixed in the liquid storage tank (16). A liquid storage tank (16) stores a liquid, a plurality of colorant storage tanks for storing a plurality of colorants, a mixing device for mixing the liquid and the colorant, and a mixed liquid storage for storing the mixed liquid. It consists of a tank, and the supply pipe (17) is connected to the mixed liquid storage tank. The mixed liquid storage tank is provided with a liquid level detecting device, detects the amount of the mixed liquid, and transfers the information to the mixing device. The mixing device supplies a predetermined amount of the liquid and the colorant from the liquid storage tank and the colorant storage tank to the mixed liquid storage tank through the metering pump when the mixed liquid amount decreases by a certain amount. Further, the mixed liquid storage tank is provided with a stirring device such as a propeller and the like, and the stirring device is operated according to an instruction of the mixing device. When mixing antistatic agents, preservatives, etc. into the colorant storage tank, replace the colorants with antistatic agents,
Use preservatives and the like.

The liquid storage tank (16) operates independently of the central processing unit (12), and colorant switching is input directly to the mixing device. However, the liquid storage tank (16) may be operated in accordance with an instruction from the central processing unit (12). In this case, the liquid storage tank (1) is operated by the central processing unit (12).
A selection signal for the colorant storage tank is sent to the mixing device in 6).

The mixing of the colorants is not limited to the mixing in the liquid storage tank (16), but may be performed by, for example, the liquid discharge amount controller (20) or the supply pipes (17) and (19). In that case, install multiple colorant storage tanks and colorant supply pipes,
Liquid discharge amount control unit (20) or supply pipe (17) (1
9) is connected to the colorant supply pipe, and the colorant is mixed with the liquid being supplied. Agitation is provided by turbulence of the liquid in the feed tube. For the selection of the colorant, a valve is provided between the colorant storage tank and the colorant supply pipe, and the colorant is selected and the amount of the colorant is adjusted by opening and closing and opening the valve. This valve may be controlled by a central processing unit (12).

[0035]

As described above, the method and the apparatus for processing printing paper according to the present invention increase the flexibility of the printing paper by supplying and humidifying the liquid to the folding line portion of the printing paper before folding. A unit that can be easily folded is created in the printing paper, and at the same time, the width of the liquid that can be easily folded is reduced to a fine width by making the supply width of the liquid a fine width. Even if there is a deviation or inclination in the supply position to the folding device, it is most likely to be broken at the humidified portion of the fine width, and the fold is corrected to the humidified portion of the fine width at the time of folding processing, The deviation and inclination of the printing paper supply position do not affect the actual fold, and the folding accuracy can be improved.At the same time, in a printing machine using a heating and drying method, the liquid is supplied to the fold line and humidified. Restore printing paper flexibility , It is possible to prevent the back cracking.

Further, by controlling the supply amount of the liquid in accordance with the operation speed of the printing press, the supply amount of the liquid per unit area of the printing paper becomes constant even if the printing speed fluctuates. Also, the folding width can be kept constant irrespective of the fluctuation of the printing speed by being constant at the minute width.
Furthermore, by controlling the supply interval of the liquid according to the operation speed, the liquid can be supplied to a fixed position on the printing paper even when the printing speed fluctuates, and the printing pattern is present in the folded line portion of the printing paper. Even if the printing speed fluctuates, even if the printing speed fluctuates, the liquid is constantly supplied to the portion other than the printed picture portion, and printing failure such as ink bleeding does not occur, and the folding accuracy can be kept constant.

Furthermore, a substance which can be visually or identifiably detected by a detector is mixed into the liquid, the liquid is supplied to the fold line of the printing paper in a fine width and humidified, and then the fold is made along the humid fold line. When the processing is performed, an identifiable portion having a fine width is formed on the spine portion of the signature, so that in the next bookbinding process, a random or missing page can be confirmed only by inspecting the spine portion. In particular,
Conventionally, when a wide range of liquid is supplied, if a colorant is mixed in as a visually identifiable substance, the color will appear in the binding part of the page even after bookbinding and printing will be defective, but if supplied in a fine width, the printing will be hidden behind the binding part There is no defect, and furthermore, if the color material is changed for each signature, it is possible to inspect the incorrect and missing pages effectively, so that the rationalization and automation of the bookbinding process can be promoted.

[0038]

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of an entire printing paper processing apparatus according to the present invention.

FIG. 2 is an explanatory view of a folding unit of the printing paper processing apparatus according to the present invention.

FIG. 3 is a control system diagram of a printing paper processing apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Web 2 Pattern 3 Printing cylinder 4 Drying unit 5 Guide roller 6 Compensator roller 7 Control motor 8, 11 Nip roller 9 Photo sensor 10 Rotary encoder 12 Central processing unit 13 Detector 14 Former guide roller 15 Liquid discharge amount control box Reference Signs List 16 liquid storage tank 17, 19 supply pipe 18 pump 20 liquid discharge amount control unit 21 nozzle 22 minute width humidifying part 23 triangular plate 24 lead-in roller 25 nipping roller 26 cutting cylinder 27 signature 31 vertex

Claims (5)

(57) [Claims] 1. A printing paper processing method for printing a printing paper, drying the printing surface of the printing paper, and then folding the printing paper, wherein a folding line portion of the printing paper is formed before the folding processing. A liquid is supplied at a fine width of 0.2 to 2.0 mm to humidify and then fold processing is performed along the humidified fold line portion. A method for processing printing paper, characterized in that the fine width is kept constant by controlling according to the speed. 2. The printing paper according to claim 1, wherein the liquid is supplied only to a predetermined position of the printing paper by controlling a supply interval of the liquid according to the operation speed. Processing method. 3. The method for processing printing paper according to claim 1, wherein a substance that can be visually recognized or detected by a detector is mixed into the liquid. 4. A supply unit for supplying printing paper, a printing unit for printing on the printing paper, a drying unit for drying a printing surface of the printing paper, and a predetermined portion of the printing paper for drying the printing surface. A printing machine having a folding unit for folding or cutting, the printing paper being located between the printing unit and the drying unit, between the drying unit and the folding unit, or inside the folding unit, and before folding. In a humidifying apparatus for supplying a liquid in a fine width of 0.2 to 2.0 mm to a fold line portion to perform humidification, a nozzle for supplying a liquid in a water flow state to the printing paper, and means for detecting an operation speed of the printing press Calculating means for calculating a supply amount of the liquid to be supplied to the printing paper from the detected operation speed while keeping the fine width constant, and supplying the liquid to be supplied to the printing paper from the nozzle according to a result of the calculation. Humidifying apparatus characterized by a control means for controlling. 5. The method according to claim 1, wherein the calculating unit calculates a supply amount of the liquid to be supplied to the printing paper, which keeps the fine width constant, and a supply interval to be supplied only to a predetermined position, based on the detected operation speed. The humidifier according to claim 4, wherein the control unit controls a supply amount and a supply interval of the liquid to be supplied from the nozzle to the printing paper according to the calculation result.