JP3000866B2 - Printing paper folding method and printing paper humidifying device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing paper folding method having a coated surface, and more particularly to a printing paper humidifying apparatus used in the folding processing method.

[0002]

2. Description of the Related Art Printing paper having a coated surface and an uncoated surface is used for forming a front cover and a back cover of a saddle stitch magazine such as a weekly magazine. In this case, 1
When the printing paper is folded at a predetermined position with the coated surface facing outward, the coated surface of one printing paper forms the front cover and the back cover of the saddle stitch magazine.

In the conventional printing paper folding method, the printing paper is completely humidified after the printing on the coated surface and the uncoated surface is completed, and after passing through a dryer to dry the ink. You. Then, the printing paper is folded along the predetermined position with the coat surface facing outward.
Here, the humidification is performed to facilitate bending of the printing paper once dried.

[0004]

Attention is paid to the fold line at a predetermined position during the folding process in the conventional printing paper folding method as described above, and the compressive force is applied to the non-coated surface which is relatively softened by humidification. Is loaded,
A tensile force is applied to a relatively hard coated surface that is not humidified and is dry.

[0005] For this reason, in the humidifying method in which the entire uncoated surface is humidified in the conventional printing paper folding method as described above, the coated surface after the bending process is liable to crack along the folding line. In addition, not only the appearance after bookbinding becomes unsightly, but also the binding staples cut into the fold lines during bookbinding are torn off, and the cover of the miscellaneous paper often separates from the miscellaneous paper main body.

In order to solve this drawback, a conventional method of folding printing paper has been proposed and publicly known, in which a method of linearly humidifying a predetermined position on a coated surface to be bent later has been proposed. However, in this case, it is actually technically difficult to linearly and uniformly contain water with a predetermined width at a predetermined position on the coat surface that does not easily contain water. Water spreads in a band shape wider than a predetermined width centering on the position of the position, and the printing on the coated surface spreads, or unevenness of water generated around the predetermined position to be bent causes wrinkles on the cover after bookbinding. This causes a problem such as that

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a coating surface after printing on a coating surface of a printing paper having a coating surface and bending the coating paper with the coating surface outside. To prevent cracks from being generated along the folding line, thereby preventing the binding needles driven into the folding line at the time of bookbinding from being torn apart and the cover of the miscellaneous paper from being separated from the miscellaneous paper main body. And a method of folding printing paper, and a method of humidifying printing paper used in the folding processing method, which does not cause uneven water content on the cover of miscellaneous paper to cause wrinkles on the cover after bookbinding. 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 sheet according to the present invention comprises: an electric discharge machining for performing an electric discharge machining on a coated surface of a printing sheet having a coated surface. A humidifying step of humidifying the coated surface of the discharge-processed printing paper; and a bending step of bending the printing paper at a predetermined position of the discharge-processed and humidified printing paper with the coated surface facing outward. It is characterized by:

Further, in the printing paper humidifying apparatus according to the present invention: an electric discharge machining apparatus which is disposed on the side of the coated side of the printing sheet having the coated side and discharges the coated side; And a humidifying device main body that humidifies the electric discharge machined coat surface.

[0010]

In the method for folding a printing sheet according to the present invention, the coated surface of the printing sheet having the coated surface is subjected to the electric discharge machining in the electric discharge machining step. The coated surface of the discharge-processed printing paper is humidified in a humidification step, and the discharge-processed and humidified printing paper is bent at a predetermined position with the coated surface outside in a bending step.

Further, in the printing paper humidifying apparatus according to the present invention, which is configured as described above, the electric discharge machining apparatus disposed on the side of the coated side of the printing paper having the coated side is used for cleaning the coated side. The electric discharge machining is performed, and the humidifying device body disposed on the side of the coating surface of the printing paper humidifies the electric discharge machining coated surface.

[0012] The method for folding printing paper according to the present invention, characterized in that it is configured as described above, further comprises:
In the electric discharge machining step, the entire coating surface of the printing paper is subjected to electric discharge machining, and in the humidification step, the coating surface of the printing paper can be humidified only at a predetermined position to be bent later in the folding step.

In the method for folding a printing sheet according to the present invention having the above-mentioned configuration, the electric discharge machining step may further include a step of folding the coating surface of the printing sheet later in the folding step. In the humidifying step, the humidifying step can humidify only the predetermined position on the coated surface of the printing paper which has been subjected to the electric discharge machining in the electric discharge machining step.

In the method of folding printing paper according to the present invention, which is configured as described above, the coated surface of the printing paper or the entire surface opposite to the coated surface is humidified before the folding step. It can 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 performs electric discharge machining on the entire coated surface of the printing paper, and the humidifying device main body is used for printing. It is possible to humidify only a predetermined position on the coated surface of the paper which is to be bent later.

[0016] The printing paper humidifying apparatus according to the present invention having the above-mentioned structure further comprises:
The electric discharge machining device performs electric discharge machining only on a predetermined position on the coating surface of the printing paper where the folding processing is performed later, and the humidifying device main body is the predetermined position where the electric discharge machining is performed by the electric discharge machining device on the coating surface of the printing paper. Humidification is possible only.

The printing paper humidifier according to the present invention, which is configured as described above, is disposed on the coated surface of the printing paper or on the surface opposite to the coated surface.
It may further comprise a secondary humidifier for humidifying the entire coated surface or the opposite surface.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention and various modifications will be described below in detail with reference to the accompanying drawings. 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 humidifier for printing paper according to an embodiment of the present invention is used in a folding apparatus.

The printing paper folding apparatus includes a coated surface C (upper surface in FIG. 1) drawn from a not-shown web having a coated surface and an uncoated surface, and a non-coated surface NC.
A printing paper 14 after a predetermined image is printed by a printing rotary press 10 such as an offset printing rotary press or a gravure printing rotary press and the ink is dried by a drying machine 12 is supplied to the lower side (in FIG. 1, for example). .

On the coated surface C of the printing paper 14 supplied to this embodiment, the front cover 16a and the back cover 1 adjacent to each other of the weekly paper in the width direction of the printing paper 14 in the printing rotary press 10 are provided.
6b are continuously printed at predetermined intervals in the longitudinal direction of the printing paper 14 in a state where the two pairs of images are arranged side by side.

The printing paper folding device is an elongated discharge extending over 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 constituted by a high-frequency corona discharger, and performs electric discharge machining over the entire coating surface C of the printing paper 14 passing below the electric discharge machine 20 in the width direction. Printing paper 1 subjected to electric discharge machining by electric discharge machine 20
The coat surface C of No. 4 has minute irregularities. The minute irregularities slightly deteriorate the above-described image of the coat surface C, but the deterioration of the image is not noticeable to human eyes.

The printing paper folding apparatus is further disposed at a position substantially symmetrical with respect to the electric discharge machining apparatus 20 on the side of the uncoated surface NC of the printing paper 14 and extends over the entire width of the printing paper 14 in the width direction. And an elongated sub-humidifying device 21.
The sub-humidifying device 21 generates an aerosol of water, and the aerosol is generated by the action of an electric field generated by a difference between a high potential generated on the coating surface C of the printing paper 14 by the electric discharge machining device 20 and a potential of the aerosol itself. The ink is sucked toward the coated surface C of the printing paper 14 and adheres to the non-coated surface NC. The aerosol generated by the sub humidifier 21 is sucked on the uncoated surface NC of the printing paper 14 by the action of the electric field, and is thus substantially uniformly sucked over the entire area in the width direction of the uncoated surface NC of the printing paper 14. You.

That is, the water content becomes substantially the same over the entire area in the width direction of the uncoated surface NC of the printing paper 14,
It is possible to effectively prevent wrinkles due to uneven moisture content in the printing paper 14.

Further, the printing paper folding apparatus further comprises a pair of printing paper 14 on the coated surface C side downstream of the electric discharge machining device 20 in the conveying direction of the printing paper 14 in the width direction of the coated surface C. A pair of water injection nozzles 22a and 22b facing a predetermined position are provided. The pair of predetermined positions are a front cover 16a and a back cover 16 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 injection nozzles 22a and 22b is connected to a water tank 24 via an open / close valve (not shown), and water pressurized by a pressurizing device 26 is supplied to the water tank 24. I have. A pair of water injection nozzles 22a, 22
"b" constitutes the main body of the humidifier in this embodiment.

Each of the pair of water jet nozzles 22a and 22b jets water with a predetermined width toward the pair of predetermined positions on the coating surface C of the printing paper 14. One pair of water injection nozzles 2
When the water jetted from 2a and 22b comes into contact with the coating surface C of the printing paper 14, the water is quickly absorbed into the pair of predetermined positions due to the above-mentioned minute unevenness of the coating surface C, and the pair of predetermined positions is used. No significant bleeding out of place.

In FIG. 1, a pair of water injection nozzles 22
The partial humidified portion on the coated surface C by the
Indicated by the dotted line X. A pair of water injection nozzles 22a, 22
The printing paper 14 that has passed underneath b is guided to a slitter 32 via a tension adjusting device 28 such as a dancer roller and a guide roller pair 30, and the slitter 32
The image is divided into two in the width direction along the boundary between 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 adjacent to each other at the pair of rotary cutting rollers 36. The part other than the image of the combination of the two is cut off. The cover 16a and the back cover 16 adjacent to each other
One of the combinations b is pressed and bent along the boundary between the cover sheet 16a and the back cover 16b from the side of the non-coated surface NC with the coated surface C outside as shown by the arrow A in the image of the one combination.

In this case, in the above one combination, the uncoated surface NC contains water at a substantially uniform moisture content as described above, and one combination of the front cover 16a and the back cover 16b adjacent to each other is used. Is relatively flexible, and the coated surface C also has a cover 16a and a back cover 1
Water from one of the pair of water injection nozzles 22a and 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, a compressive force is applied to the linear position of the non-coated surface NC corresponding to the boundary, and a tensile force is applied to the linear position of the coated surface C corresponding to the boundary. In this case, no crack occurs at the linear position of the coat surface C corresponding to the boundary, and the appearance after bookbinding does not become unsightly. In a bookbinding process (not shown), cover sheets 16a adjacent to each other are provided.
And the back cover 16b are bound by the binding paper body and the binding needle driven into the fold line, and then the binding needle portion is torn off to form one combination of the mutually adjacent cover 16a and back cover 16b. There is no separation from the miscellaneous paper body. [First Modification] FIG. 2 schematically shows a main part of a first modification of the printing paper humidifying apparatus according to the embodiment of the present invention shown in FIG.

In this modified example, instead of using the elongated electric discharge machine 20 facing the coated surface C of the printing paper 14 and extending over the entire area in the width direction of the printing paper 14 in the above-described embodiment, And a pair of electric discharge machines 20a and 20b facing the coating surface C of the printing paper 14 and facing a pair of predetermined positions in the width direction of the printing paper 14. The pair of predetermined positions corresponds to the pair of predetermined positions in the width direction of the printing paper 14 facing the coating surface C of the printing paper 14 on 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, a portion of the coating surface C of the printing paper 14 which has been subjected to the electric discharge machining in a band by the pair of electric discharge machining devices 20 a and 20 b is indicated by oblique lines Y. Other configurations are shown in FIG.
This is the same as the configuration 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 coating surface C of the printing paper 14 are subjected to electric discharge machining. The sum of the power consumed by the electric discharge machine 20b is far more than the power consumed by the elongated electric discharge machine 20 that 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. Also one
The sum of the production or purchase costs of each of the pair of electric discharge machines 20a and 20b is much lower than the production or purchase cost of a single elongated electric discharge machine 20.

The elongated sub-humidifying device 21 is substantially symmetrical with respect to the pair of electric discharge machining devices 20a and 20b on the uncoated surface NC side of the printing paper 14 as in the embodiment of the present invention shown in FIG. And extends over the entire width of the printing paper 14, but the auxiliary humidifier 21
The aerosol of water generated over the entire area in the width direction on the side of the non-coated surface NC of No. 4 is a pair of electric discharge machines 20a and 20b.
The electric field generated by the difference between the high electric potential generated at the pair of predetermined positions in the width direction of the coated surface C of the printing paper 14 and the electric potential of the aerosol itself causes 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 uncoated surface NC of the printing paper 14 have a substantially uniform moisture content with a predetermined width only at the above-mentioned pair of predetermined positions in the width direction of the printing paper 14. Is hydrated.

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

In this modification, the uncoated surface N of the printing paper 14 is used in the printing paper humidifying apparatus according to the above-described embodiment.
The sub-humidifying device 21 disposed on the side of C is deleted, and 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 coating surface C side of the printing paper 14. It is arranged between one electric discharge machine 20 and a pair of water injection nozzles 22a and 22b.

With such a configuration, the sub humidifier 21
The aerosol generated by ′ is not only attracted to the coating surface C of the printing paper 14 by the action of the electric field described above, but also travels to the coating face C by the action of gravity. For this reason, the aerosol generated by the sub humidifier 21 ′ is
Can be efficiently absorbed by the coated surface C of
The amount of energy that the sub-humidifying device 21 'must generate an aerosol to make the coated surface C of the printing paper 14 wet is shown in FIG.
It can be reduced compared to the case of 1. [Third Modification] FIG. 4 schematically shows a main part of a third modification of the printing paper humidifier according to the embodiment of the present invention shown in FIG.

In this modification, the printing paper 147 is supplied to the humidifier with the uncoated surface NC facing upward and the coated surface C facing downward. In this modified example, an electric discharge machining apparatus 20 ', a sub-humidification apparatus 21', and a pair of water discharge nozzles 20 ', 21' The ejection nozzles 20 ′ a and 20 ′ b are arranged on the lower side of the printing paper 14, that is, on the side of the coating surface C.

With such a configuration, the sub humidifier 21
And the coated surface C of the printing paper 14 can be reliably prevented from being contaminated by dripping from the pair of water jet nozzles 20'a and 20'b.

In each of the above-described embodiments and modified examples, the printing paper 14 is a so-called single-side coated paper in which one surface is a coated surface C and the other surface is an uncoated surface NC. The method for folding the printing paper and the humidifying device for the printing paper may be applied to double-side coated paper. In this case, electric discharge machining is performed on both surfaces. The electric discharge machining of the surface humidified by the sub humidifier over the entire width of the printing paper is performed over the entire width of the printing paper, and is humidified by the humidifier body only at a predetermined position in the width direction of the printing paper. The electric discharge machining of the surface can be performed only at the predetermined position in the width direction of the printing paper. The surface to be humidified by the humidifying device body only at a predetermined position in the width direction of the printing paper may be only the surface that becomes outside in the folding process, but not only the surface that becomes outside in the folding process but also the width direction of the surface that becomes inside. Can be humidified by the humidifier body at a predetermined position.
Further, the surface to be humidified by the sub humidifier over the entire area in the width direction of the printing paper may be only the surface that becomes the inside in the bending process, but may be the surface that becomes the outside in the bending process or may be both surfaces. .

[0040]

As described above in detail, according to the method for folding a printing sheet and the humidifying device for a printing sheet according to the present invention, printing on the coated side of the printing sheet having a coated side is completed and the coated side is finished. The coated surface after bending with the side facing out does not crack along the fold line, thereby tearing off the binding staples that were driven into the fold line during bookbinding, resulting in a miscellaneous paper cover. It is possible to prevent the paper from being separated from the main body of the paper, and furthermore, it is possible to prevent the cover of the miscellaneous paper from having water-containing unevenness and to cause wrinkles on the cover after bookbinding.

[Brief description of the 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. A humidifying device for printing paper according to one embodiment of the present invention is used.

FIG. 2 is a perspective view schematically showing a main part of a first modification of the printing paper humidifying apparatus according to the embodiment of the present invention shown in FIG. 1;

FIG. 3 is a perspective view schematically showing a main part of a second modification of the printing paper humidifying apparatus according to the embodiment of the present invention shown in FIG. 1;

FIG. 4 is a perspective view schematically showing a main part of a third modified example of the printing paper humidifying apparatus according to the embodiment of the present invention shown in FIG. 1;

[Explanation of symbols]

10 ... printing rotary press, 12 ... dryer, 14 ... printing paper, 1
6a: front cover, 16b: back cover, 20, 20a, 20b ...
Electric discharge machine, 21, 21 '... sub-humidifier, 22a, 2
2b, 22'a, 22'b: water jet nozzle (humidifying device main body), 24: water tank, 26: pressurizing device, 28: tension adjusting device, 30: guide roller pair, 32: slitter, 34
... turn bar, 36 ... rotary cutting roller.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B65H 45/00-45/30 B41F 23/02

Claims (10)

(57) [Claims] An electric discharge machining step of performing electric discharge machining on a coated surface of a printing paper having a coated surface; a humidifying step of humidifying a coated surface of the electric discharge processed printing paper; A folding step of folding the printing paper with the coated surface outside at a predetermined position. 2. In the electric discharge machining step, the entire coated surface of the printing paper is subjected to electric discharge machining, and in the humidifying step, the coating surface of the printing paper is humidified only at a predetermined position to be bent later in a folding step. The method of folding print paper according to claim 1, wherein: 3. In the electric discharge machining step, electric discharge machining is performed only at a predetermined position on the coated surface of the printing paper to be bent later in the folding step, and in the humidifying step, electric discharge is performed on the coated surface of the printing paper by the electric discharge machining step. 2. The method according to claim 1, wherein the humidification is performed only on the processed 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 bending step. A method for folding printing paper according to the section. 5. The printing paper according to claim 1, further comprising a sub-humidification step of humidifying the entire coated surface of the printing paper before the bending step. Folding method. 6. An electric discharge machine arranged on the side of the coated surface of the printing paper having a coated surface and performing electric discharge machining on the coated surface; and an electric discharge machine arranged on the side of the coated surface of the printing paper and subjected to electric discharge machining. A humidifying device main body for humidifying the printing paper. 7. The electric discharge machining apparatus 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, wherein 8. The electric discharge machining device performs electric discharge machining only on a predetermined position on the coated surface of the printing paper to be bent later, and the humidifier body is subjected to electric discharge machining on the coated surface of the printing paper by the electric 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 printing apparatus according to claim 6 , further comprising a sub-humidifying device disposed on a side of the printing paper opposite to the coating surface and humidifying the entire surface on the opposite side. Term
9. The humidifying device for printing paper according to any one of 8 . 10. The apparatus according to claim 6, further comprising a sub-humidifying device disposed on the side of the coating surface of the printing paper and humidifying the entire coating surface. A humidifier for printing paper according to the above.