JPH08119536A - Folding processing method for printing paper and humidifier for printing paper - Google Patents

Abstract

PURPOSE: Not to cause cracks on a folded line on a coated surface after folding processing with the printed coated surface of printing paper outside, to prevent separation of a cover of the coated surface from a main body of general paper as a part of a stitching needle driven on the folded line at the time of bookbinding and to prevent growth of seams on the cover after bookbinding due to moisture nonuniformity of the cover. CONSTITUTION: A folding processing method of printing paper is furnished with an electric discharge machining process to electric discharge machine a coated surface of the printing paper 14 having the coated surface C, a humidifying process to humidify the coated surface C of the printing paper electric discharge machined and a bending process to bend the printing paper with the coated surface outside at a specified position of the printing paper electric discharge machined and humidifying processed. Additionally, a humidifier is furnished with an electric discharge machining device 20 arranged on the side of the coated surface of the printing paper 14 having the coated surface C and to electric discharge machine the coated surface and humidifier main bodies 22a, 22b arranged on the side of the coated surface of the printing paper and to humidify the coated surface electric discharge machined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for folding a printing sheet having a coated surface, and further relates to a humidifying device for the printing sheet used in this folding method.

[0002]

2. Description of the Related Art Printing paper having a coated surface and a non-coated surface is used, for example, to form a front cover and a back cover of a saddle stitch magazine such as a weekly magazine. In this case, 1 of the specified size
The printing surface of one sheet is bent at a predetermined position with the coated surface facing outward, and the coated surface of one printing sheet constitutes the front cover and the back cover of a saddle stitch magazine.

In the conventional method of folding a printing paper, the printing paper is completely printed on the coated surface and the uncoated surface and is passed through a drier to dry the ink, and then the entire uncoated surface is humidified. It Then, the printing paper is bent along a predetermined position with the coated surface facing outward.
Here, the humidification is performed in order to facilitate bending of the printing paper once dried.

[0004]

In the folding process of the conventional printing paper folding method as described above, paying attention to the folding line at a predetermined position, the compressive force is applied to the non-coated surface which has become relatively soft due to humidification. Is loaded,
A tensile force is applied to a relatively hard coated surface that is not humidified.

For this reason, in the conventional folding method for printing paper as described above, in the case of the humidifying method in which the entire uncoated surface is humidified, cracks are likely to occur along the folding line on the coated surface after the bending processing. Not only does the appearance after bookbinding become unsightly, but the part of the binding needle that is driven into the folding line during bookbinding is torn off, and the cover of the miscellaneous paper often separates from the main body of the miscellaneous paper.

In order to solve this drawback of the prior art, a method of linearly humidifying a predetermined position on the coated surface, which is to be bent later, has already been proposed and publicly known as a method of folding printing paper. However, in this case, it is technically difficult to uniformly contain water in a predetermined width at a predetermined position on the coated surface that does not easily contain water. The water spreads in a band wider than the specified width around the position of, and the print on the coated surface is blurred, or the unevenness of water generated around the specified position that is bent causes wrinkles on the cover after binding. It is causing problems such as causing it.

The present invention has been made under the above circumstances, and an object of the present invention is to coat a printed sheet having a coated surface after finishing printing on the coated surface and bending the coated surface with the coated surface facing outward. It does not cause cracks along the folding line and prevents the cover sheet of the miscellaneous paper from being separated from the main body of the miscellaneous paper by tearing off the portion of the binding needle driven into the folding line during bookbinding. A method of folding a printing paper, and a method of folding a printing paper used in this folding method, which does not cause unevenness of water content on the cover of a miscellaneous paper to cause wrinkles on the cover after binding. It is to provide a device.

[0008]

In order to achieve the above-mentioned object of the present invention, a method for folding a printing paper according to the present invention is: electric discharge machining for electric discharge machining a coated surface of a printing paper having a coated surface. A humidifying step of humidifying the coated surface of the electric discharge machined printing paper; and a bending step of bending the printing paper sheet with the coated surface facing outside at a predetermined position of the electric discharge machined humidified print paper. It is characterized by that.

Further, in the humidifying device for a printing paper according to the present invention: an electric discharge machine arranged on the side of the coated surface of the printing paper having a coated surface for electric discharge machining the coated surface; and a side of the coated surface of the printing paper. And a humidifying device main body for humidifying the electric discharge machined coating surface.

[0010]

In the method of folding a printing sheet according to the present invention, which is characterized as described above, the printing surface having the coated surface is subjected to the electrical discharge machining in the electrical discharge machining step. The coated surface of the electric discharge machined printing paper is humidified in the humidifying step, and the electric discharge machined and humidified print paper is bent at a predetermined position with the coated surface facing outside.

Further, in the humidifying device for a printing paper according to the present invention, which is characterized as described above, the electric discharge machining device arranged on the side of the coated surface of the printing paper having the coated surface changes the coated surface. The electric discharge machining is performed, and the humidifying device main body arranged on the side of the coated surface of the printing paper humidifies the electric discharge machined coated surface.

In the method for folding a printing paper according to the present invention, which is characterized in that it is configured as described above,
In the electric discharge machining step, the entire coated surface of the printing paper is subjected to electric discharge machining, and in the humidification step, the coated surface of the printing paper can be humidified only at a predetermined position to be bent in the folding step later.

In the method for folding a printing paper according to the present invention, which is characterized as described above, the predetermined electrical discharge machining step is performed in the folding step later on the coated surface of the printing paper. It is possible to perform the electric discharge machining only on the above position, and in the humidifying step, only the predetermined position where the electric discharge machining is performed on the coated surface of the printing paper is humidified.

In the method of folding a printing paper according to the present invention, which is configured as described above, the entire coated surface of the printing paper or the surface opposite to the coated surface is humidified before the folding step. It is possible to further include a sub-humidification step.

In the humidifying device for printing paper according to the present invention, which is configured as described above, the electric discharge machining device further performs electric discharge machining on the entire coated surface of the printing paper, and the humidifying device body prints. It is possible to humidify only a predetermined position on the coated surface of the paper, which is to be bent later.

Further, in the humidifying device for printing paper according to the present invention, which is configured as described above,
The electric discharge machining device performs electric discharge machining only on a predetermined position on the coated surface of the printing paper, which is to be bent later, and the humidifying device main body is the predetermined position where electric discharge machining is performed on the coated surface of the printing paper by the electric discharge machining device. It can be humidified only.

A humidifying device for a printing sheet according to the present invention, which is configured as described above, is arranged on the coated surface of the printing sheet or on the side opposite to the coated surface,
A sub-humidifying device for humidifying the entire coated surface or the opposite surface can be further provided.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention and various modifications will be described below in detail with reference to the accompanying drawings. [Embodiment] FIG. 1 schematically shows an entire printing paper folding apparatus for carrying out a printing paper folding method according to an embodiment of the present invention. A humidifying device for printing paper according to an embodiment of the invention is used in the folding device.

In this printing paper folding device, a coated surface C (the upper surface in FIG. 1) and an uncoated surface NC which are drawn out from a winding paper (not shown) having a coated surface and an uncoated surface are provided.
To (lower surface in FIG. 1), a predetermined image is printed by a printing press 10 such as an offset printing press or a gravure printing press, and a printing paper 14 after the ink is dried by a dryer 12 is supplied. .

On the coated surface C of the printing paper 14 supplied to this embodiment, the front cover 16a and the back cover 1 of the weekly paper which are adjacent to each other in the width direction of the printing paper 14 in the printing press 10 are arranged.
Two pairs of images of the combination of 6b are printed continuously at a predetermined interval in the longitudinal direction of the printing paper 14 in a state of being aligned.

The printing paper folding device is a long and narrow discharge extending across the entire width of the printing paper 14 facing the coated surface C of the printing paper 14 supplied from the dryer 12 to the printing paper folding device. A processing device 20 is provided. In this embodiment, the electric discharge machine 20 is composed of a high frequency corona discharger, and discharges the coated surface C of the printing paper 14 passing below the electric discharge machine 20 over the entire width direction. Printing paper 1 that has been electric discharge machined by an electric discharge machine 20
Micro unevenness is formed on the coated surface C of No. 4, which slightly deteriorates the above-described image of the coated surface C, but this deterioration of the image is not noticeable to human eyes.

The printing paper folding device is further arranged in a position substantially symmetrical to the electric discharge machining device 20 on the non-coated surface NC side of the printing paper 14 and extends over the entire width of the printing paper 14. The slender sub-humidifying device 21 is provided.
The sub-humidifying device 21 generates an aerosol of water, and the aerosol is generated by the action of the electric field generated by the difference between the high potential generated on the coated surface C of the printing paper 14 by the electric discharge machine 20 and the potential of the aerosol itself. It is sucked toward the coated surface C of the printing paper 14 and adheres to the non-coated surface NC. Since the aerosol generated by the sub-humidifying device 21 is sucked to the non-coated surface NC of the printing paper 14 by the action of the electric field, it is substantially uniformly sucked over the entire width of the non-coated surface NC of the printing paper 14. It

That is, the water content is substantially the same over the entire width direction of the non-coated surface NC of the printing paper 14,
Wrinkles due to uneven water content are effectively prevented from occurring on the printing paper 14.

The printing paper folding apparatus further includes a pair of printing paper 14 on the coated surface C side in the width direction of the coated surface C on the downstream side of the electric discharge processing apparatus 20 in the transport direction of the printing paper 14. A pair of water jet nozzles 22a and 22b facing each other at a predetermined position are provided. The pair of predetermined positions are defined by the front cover 16a and the back cover 16 which are adjacent to each other.
cover 16a in each of the two pairs of images of the combination of b
And the back cover 16b.

Each of the pair of water jet nozzles 22a and 22b is connected to a water tank 24 via an on-off valve (not shown), and the water tank 24 is supplied with water pressurized by a pressurizing device 26. There is. A pair of water injection nozzles 22a, 22
Reference character b constitutes the humidifying device main body in this embodiment.

Each of the pair of water jet nozzles 22a and 22b jets water with a predetermined width toward the predetermined position of the pair of coated surfaces C of the printing paper 14. A pair of water injection nozzles 2
When the water sprayed from 2a, 22b comes into contact with the coating surface C of the printing paper 14, it is quickly absorbed at the pair of predetermined positions because of the above-mentioned minute irregularities of the coating surface C, and the pair of predetermined It does not spread far apart and greatly blurs.

In FIG. 1, a pair of water jet nozzles 22 are provided.
2 for the partially moistened part on the coated surface C by a and 22b.
This is indicated by the dashed line X. A pair of water injection nozzles 22a, 22
The printing paper 14 that has passed below b is guided to a slitter 32 via a tension adjusting device 28 such as a dancer roller and a guide roller pair 30.
It is divided into two in the width direction along the boundary of the pair of images. Each of the two divided printing papers 14 is sent to a pair of rotary cutting rollers 36 via a turn bar 34, and one of the front cover 16a and the back cover 16b which are adjacent to each other at the pair of rotary cutting rollers 36. Parts other than the images of the three combinations are cut off. Front cover 16a and back cover 16 that are adjacent to each other
In the image of the above-described one combination, one combination of b is pressed and bent along the boundary between the front cover 16a and the back cover 16b from the side of the non-coated surface NC with the coated surface C as the outer side as shown by an arrow A.

At this time, in the above-mentioned one combination, the non-coated surface NC contains water with a substantially uniform water content as described above, and one combination of the front cover 16a and the back cover 16b which are adjacent to each other. Is relatively flexible, and even on the coated surface C, the front cover 16a and the back cover 1
Water from one of the pair of water jet nozzles 22a, 22b is linearly absorbed with a predetermined width along the boundary of 6b, and is linearly flexible with a predetermined width along the boundary.
Therefore, when bent as described above, the compressive force is applied to the linear position of the non-coated surface NC corresponding to the boundary and the tensile force is applied to the linear position of the coated surface C corresponding to the boundary. Even in this case, cracks do not occur at the linear position of the coated surface C corresponding to the above-mentioned boundary, and the appearance after bookbinding does not become unsightly. Then, in a subsequent bookbinding process (not shown), cover sheets 16a adjacent to each other
And the back cover 16b are bound together by the main body of the miscellaneous paper and the binding needles punched in the folding lines, and then the binding needles are torn off to form a combination of the front cover 16a and the back cover 16b which are adjacent to each other. It does not separate from the body of the miscellaneous paper. [First Modification] FIG. 2 schematically shows a main part of a first modification of the humidifying device for printing paper according to the embodiment of the invention shown in FIG.

In this modification, instead of using the slender electric discharge machining device 20 facing the coated surface C of the printing paper 14 and extending over the entire widthwise direction of the printing paper 14 in the above-described embodiment. A pair of electric discharge machines 20a, 20b are provided which face the coated surface C of the printing paper 14 and face a pair of predetermined positions in the width direction of the printing paper 14. The pair of predetermined positions is a pair of predetermined positions in the width direction of the printing paper 14 that faces the coated surface C of the printing paper 14 in which the pair of water jet nozzles 22a and 22b are arranged in the above-described embodiment. Is the same as the position.

In FIG. 2, the portion of the coated surface C of the printing paper 14 which has been subjected to the electric discharge machining in a strip shape by the pair of electric discharge machining devices 20a and 20b is indicated by the diagonal line Y. Other configurations are shown in FIG.
The configuration is the same as that of the humidifying device for printing paper according to the embodiment of the present invention shown in FIG.

In the case of this modification, only a pair of predetermined positions in the width direction of the printing paper 14 facing the coated surface C of the printing paper 14 are subjected to electrical discharge machining, and therefore a pair of electrical discharge machining devices 20a, 20a, The total electric power consumed by 20b is far greater than the electric power consumed by the long and narrow electric discharge machining device 20 which is opposed to the coated surface C of the printing paper 14 and extends over the entire width of the printing paper 14 in the above-described embodiment. Small. Again 1
The total cost of manufacturing or purchasing each of the pair of electric discharge machines 20a and 20b is also much lower than the cost of manufacturing or purchasing a single elongated electric discharge machine 20.

The elongated sub-humidifying device 21 is substantially symmetrical with respect to the pair of electric discharge machines 20a, 20b on the non-coated surface NC side of the printing paper 14 as in the case of the embodiment of the present invention shown in FIG. Although it is arranged at various positions and extends over the entire area of the printing paper 14 in the width direction, the auxiliary humidifying device 21
The water aerosol generated over the entire width direction on the non-coated surface NC side of No. 4 is a pair of electric discharge machines 20a, 20b.
By the action of the electric field generated by the difference between the high potential generated at a pair of predetermined positions in the width direction of the coated surface C of the printing paper 14 and the potential of the aerosol itself. It is sucked toward a pair of predetermined positions in the width direction, and adheres to the non-coated surface NC corresponding to the pair of predetermined positions.

That is, in this modification, both the coated surface C and the non-coated surface NC of the printing paper 14 have a substantially uniform water content at a predetermined width only in the pair of predetermined positions in the width direction of the printing paper 14. Is hydrated by.

In this modification, the total of the electric power consumed by each of the pair of electric discharge machines 20a and 20b and the total of the manufacturing or purchasing costs of each of the electric discharge machining apparatuses 20a and 20b as described above are one embodiment of the present invention shown in FIG. The same advantages as in the case of the embodiment of the invention shown in FIG. 1 can be obtained, except that the power consumption and manufacturing or purchasing cost of one elongated electric discharge machine 20 in the case of the example is much lower. . [Second Modification] FIG. 3 schematically shows a main part of a second modification of the printing paper humidifying apparatus according to the embodiment of the invention shown in FIG.

In this modification, the non-coated surface N of the printing paper 14 is used in the humidifying device for printing paper according to the above-described embodiment.
The sub-humidifying device 21 arranged on the C side is deleted, and instead, a sub-humidifying device 21 ′ having the same structure as the sub-humidifying device 21 is elongated in the longitudinal direction of the printing paper 14 on the coated surface C side of the printing paper 14. It is arranged between one electric discharge machine 20 and a pair of water jet nozzles 22a and 22b.

With such a configuration, the sub-humidifying device 21
The aerosol generated by ′ is not only attracted to the coated surface C of the printing paper 14 by the action of the electric field described above, but also goes toward the coated surface C by the action of gravity. For this reason, the aerosol generated by the sub-humidifying device 21 'is applied to the printing paper 14
Since it can be efficiently absorbed by the coated surface C of
The amount of energy required for the sub-humidifying device 21 'to generate aerosol in order to cause the coated surface C of the printing paper 14 to contain water is shown in FIG.
It can be reduced compared to the case of 1. [Third Modification] FIG. 4 schematically shows an essential part of a third modification of the printing paper humidifying apparatus according to the embodiment of the invention shown in FIG.

In this modification, the printing paper 147 is supplied to the humidifying device with the non-coated surface NC facing upward and the coated surface C facing downward. In this modification, the electrical discharge machine 20 ', the auxiliary humidifier 21 and the pair of water jet nozzles 20a, 20b in the above-described embodiment have the same structure as the electrical discharge machine 20', the auxiliary humidifier 21 'and the pair of water. The ejection nozzles 20'a and 20'b are arranged on the lower side of the printing paper 14, that is, the coated surface C side.

With such a structure, the sub-humidifying device 21
It is possible to reliably prevent the coated surface C of the printing paper 14 from being contaminated due to water dripping from the nozzles 20'a and 20'b.

In each of the above-described embodiments and modifications, the printing paper 14 is a so-called single-sided coated paper in which one surface is the coated surface C and the other surface is the uncoated surface NC. The double-sided coated paper may be applied to the printing paper folding method and the printing paper humidifying device. In this case, both sides are subjected to electric discharge machining. Then, the electrical discharge machining of the surface that is humidified by the sub-humidifying device over the entire width of the printing paper is performed over the entire width of the printing paper, and is humidified by the humidifier main body only at a predetermined position in the width direction of the printing paper. The electric discharge machining of the surface to be printed can be performed only on the predetermined position in the width direction of the printing paper. It should be noted that the surface that is humidified by the humidifying device main body only at a predetermined position in the width direction of the printing paper need only be the outside surface in the folding process, but the width direction of the inside surface as well as the outside surface in the folding process It is also possible to humidify the predetermined position of the humidifying device main body.
Further, the surface that is humidified by the sub-humidifying device over the entire width direction of the printing paper may be only the surface that becomes the inner side in the folding process, but may be the surface that becomes the outer side in the folding process or both sides. .

[0040]

As described above in detail, according to the method for folding a printing paper and the humidifying device for a printing paper according to the present invention, the printing on the coated surface of the printing paper having the coated surface is completed and the coated surface is finished. When the booklet is folded, the coated surface will not be cracked along the folding line after the folding process. It is possible to prevent the paper from being separated from the main body, and furthermore, it is possible to prevent uneven water content on the cover of the miscellaneous paper to cause wrinkles on the cover after binding.

[Brief description of drawings]

FIG. 1 is a perspective view schematically showing an entire printing paper folding apparatus for carrying out a printing paper folding method according to an embodiment of the present invention. The printing paper humidifying device according to the embodiment of the present invention is used.

FIG. 2 is a perspective view schematically showing a main part of a first modification of the humidifying device for a printing paper according to the embodiment of the present invention shown in FIG.

FIG. 3 is a perspective view schematically showing a main part of a second modified example of the printing paper humidifying device according to the embodiment of the present invention shown in FIG.

FIG. 4 is a perspective view schematically showing a main part of a third modification of the printing paper humidifying apparatus according to the embodiment of the invention shown in FIG.

[Explanation of symbols]

10 ... Printing press, 12 ... Dryer, 14 ... Printing paper, 1
6a ... Front cover, 16b ... Back cover, 20, 20a, 20b ...
Electric discharge machine 21,21 '... Sub-humidifying device, 22a, 2
2b, 22'a, 22'b ... Water injection nozzle (humidifying device main body), 24 ... Water tank, 26 ... Pressurizing device, 28 ... Tension adjusting device, 30 ... Guide roller pair, 32 ... Slitting device, 34
... turn bar, 36 ... rotary cutting roller.

Claims (10)

[Claims] 1. An electric discharge machining step of electric discharge machining a coated surface of a printing paper having a coated surface; a humidification step of humidifying a coated surface of an electric discharge machined printing paper; And a folding step of folding the printing paper with the coated surface facing outward at a predetermined position. 2. In the electric discharge machining step, the entire coated surface of the printing paper is electric discharge machined, and in the humidification step, only the predetermined position on the coated surface of the printing paper that is bent later in the folding step is humidified. The method for folding a printing paper according to claim 1, wherein 3. In the electric discharge machining step, electric discharge machining is performed only on a predetermined position on the coated surface of the printing paper that is bent later in the bending step, and in the humidification step, electric discharge is performed by the electric discharge machining step on the coated surface of the printing paper. The method for folding a printing sheet according to claim 1, wherein the processed sheet is humidified only at the predetermined position. 4. The method according to claim 1, further comprising a sub-humidifying step of humidifying the entire surface of the printing paper opposite to the coated surface before the folding step. The method for folding a printing paper according to item. 5. The printing paper according to claim 1, further comprising a sub-humidifying step of humidifying the entire coated surface of the printing paper before the folding step. Folding method. 6. An electric discharge machine which is arranged on the coated surface side of a printing paper having a coated surface and discharge-machines the coated surface; A humidifying device main body for humidifying; and a humidifying device for printing paper, comprising: 7. The electric discharge machining device performs electric discharge machining on the entire coated surface of the printing paper, and the humidifying device main body humidifies only a predetermined position on the coated surface of the printing paper to be bent later. The humidifying device for printing paper according to claim 6. 8. The electrical discharge machining device performs electrical discharge machining only on a predetermined position on the coated surface of the printing paper, which is to be bent later, and the humidifying device main body is electrical discharge machined on the coated surface of the printing paper by the electrical discharge machining device. 7. The humidifying device for printing paper according to claim 6, wherein the humidifying is performed only at the predetermined position. 9. The method according to claim 5, further comprising a sub-humidifying device which is arranged on the side opposite to the coated surface of the printing paper and humidifies the entire opposite surface. Item 7. A humidifying device for printing paper according to any one of items 7. 10. The method according to claim 6, further comprising a sub-humidifying device which is arranged on the coated surface side of the printing paper and humidifies the entire coated surface. Humidification device for the printing paper described.