JP3451779B2 - Humidifying device and method for printing paper - 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 humidifying apparatus and a printing paper humidifying method for controlling the water content of a printing paper which has been humidified after printing so as to attain a desired water content.

[0002]

2. Description of the Related Art The water content of printing paper before printing is usually 5-6.
%, The water content is usually reduced to 1 to 2% because the printing paper after printing is dried by the dryer in the offset rotary printing machine. On the other hand, in the offset sheet-fed printing press or letterpress printing machine, the printing paper after printing is not dried with the ink by the dryer, and therefore the water content before printing is maintained.

Many books and magazines are bound by bundling a plurality of printing papers printed by various printing machines. The water content of each of the plurality of printing papers is the printing used for printing as described above. It depends on the type of machine. Therefore, if the plurality of printing papers are bound immediately after printing, the printing papers having a water content lower than the stable water content among the plurality of printing papers have a stable water content as time passes after the bookbinding. Printing paper that absorbs moisture in the air and grows slightly in size, and that has a higher moisture content than the stable moisture content releases moisture into the air to achieve a stable moisture content It contracts slightly. For this reason, when a certain amount of time has passed after bookbinding, a step may occur on the cutting surface of a plurality of printing sheets of a bound book or magazine, making it impossible to sell as a product.

In order to prevent the occurrence of such a step, in the conventional rotary offset printing press, the temperature of the printing paper is lowered by spraying and humidifying the printing paper immediately after the ink is dried by the dryer with water. To improve the amount of water,
Water containing silicon is humidified by using a roller to prevent printing damage due to rubbing between multiple printing papers during binding and to improve the alignment between multiple printing papers. There is.

[0005]

However, in the above-mentioned conventional humidifying device, the amount of humidification of the printing paper can be changed, but the actual water content of the printing paper depends on the surface treatment of the printing paper and the usage status of the printing ink. It is difficult to set a desired value depending on the changing water absorption amount of the printing paper.

In order to make the water absorption amount of the printing paper independent of the influence of the surface treatment of the printing paper and the usage of the printing ink, the surface of the printing paper after printing is introduced before the printing paper after printing is introduced into the humidifying device. However, the water content of the roll-shaped printing papers used in rotary printing machines differs greatly among the roll-shaped printing papers. The water content may differ greatly between the inner part and the inner part. Even if the printing speed or drying temperature is changed, if the water content of the printing paper after drying changes and printing is performed for multiple days, the printing paper should be stored after the printing of one day is completed. Depending on the room temperature, the water content of the printing paper on the next day may differ greatly from the water content of the same printing paper on the previous day.

Therefore, it is difficult to set the water content of each of the plurality of printing sheets immediately before bookbinding to a predetermined value, and a step is formed on the cutting surface of the plurality of printing sheets of a book or magazine after bookbinding, so that it cannot be sold as a product. I couldn't get rid of it.

The present invention has been made under the above circumstances, and an object of the present invention is to ensure that the water content of each of a plurality of printing sheets immediately before bookbinding can always be reliably set to a predetermined value, and books or magazines after bookbinding. It is an object of the present invention to provide a humidifying device and a humidifying method for a printing paper, which does not cause a step on the cut surfaces of the plurality of printing papers.

[0009]

In order to achieve the above-mentioned object of the present invention, a humidifying device for a printing paper according to the present invention comprises: a humidifying means for humidifying a printing paper after printing; a humidifying means for the printing paper. A moisture content measuring means for measuring the moisture content of the humidified portion and transmitting a moisture content signal corresponding to the measured moisture content; and a moisture content signal received from the moisture content measuring means, and a received moisture content signal by comparing the desired moisture content, water content signal received by the humidification amount control means for adjusting the amount of humidification by the humidification means for printing paper after printing so that the desired moisture content; includes a printing paper Has a water absorption
It has one side and the other side that are different from each other.
The measuring means measures the water content of one side and the other side of the printing paper.
The humidifier is supported on one side and the other side of the printing paper.
Humidification hand for those who received the moisture content signal below the desired moisture content
The water content signal received by the electric discharge machining before humidification by the step is
Release that improves the water absorption of the side that does not reach the desired water content.
It is characterized in that it further comprises an electric processing means .

In order to achieve the above-mentioned object of the present invention, the method for humidifying a printing paper according to the present invention is : used in a printing machine having a humidifying means for humidifying a printing paper after printing; A moisture content measuring step of measuring the moisture content of the portion humidified by the humidifying means; comparing the moisture content measured in the moisture content measuring step with the desired moisture content, and the measured moisture content becomes the desired moisture content. And a humidifying amount control step of adjusting the humidifying amount of the printing paper after printing so that the printing paper has different water absorption
And the surface of the printing paper in the water content measuring step.
We measure the water content of each side and the humidification method.
Is the water content measured on one side and the other side of the printing paper.
If the moisture content does not reach the desired level, release it before humidifying by the humidifying means.
The water content measured by electro-processing is less than the desired water content
Equipped with an electric discharge machining process to improve the water absorption on one side
It is characterized by Characterized by

[0011]

In the humidifying device for printing paper according to the present invention, which is configured as described above, after the humidifying means humidifies the printing paper after printing, the moisture content measuring means humidifies the printing paper by the humidifying means. The moisture content of the portion thus measured is measured, and a moisture content signal corresponding to the measured moisture content is transmitted.
The moisture content signal from the moisture content measuring means is received by the humidification amount control means, the humidification amount control means compares the received moisture content signal with the desired moisture content signal and the received moisture content signal becomes the desired moisture content. The amount of humidification by the humidifying means for the printing paper after printing is adjusted.

In the humidifying device for printing paper according to the present invention, which is configured as described above, the printing paper has one surface and the other surface having different water absorption rates , and the water content measurement is performed. The means measures the moisture content of each of the one side and the other side of the printing paper, and the humidifying device determines that the moisture content signal received on the one side and the other side of the printing paper does not reach the desired moisture content. EDM the EDM means prior humidified moisture content signal received above Ru improve the water absorption of the surface of the person who is less than the desired moisture content.

A method for humidifying a printing paper according to the present invention, which is characterized as described above, is used in a printing machine having a humidifying means for humidifying a printing paper after printing, and the printing paper is humidified by the humidifying means. The moisture content of the humidified portion is measured by the moisture content measuring step. The moisture content measured in the moisture content measurement step is compared with the desired moisture content in the humidification amount control step, and the humidification amount on the printing paper after printing is adjusted so that the measured moisture content becomes the desired moisture content.

[0014] humidification method of the printing paper in accordance with the present invention which is characterized in that it is composed as described above, the printing paper is water absorption has a different one surface and the other surface to each other, the water content measurement in step have one surface and the other surface of each of the moisture content of the printing paper is measured, measurement in one surface and the other surface of the printing sheet
If the specified moisture content does not reach the desired moisture content, use the humidifying means.
Before humidification, the electrical discharge machining process is performed before the above measurement.
Moisture content is Ru improve the water absorption of the surface of the person who is less than the desired moisture content.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Various embodiments of a printing paper humidifying apparatus for carrying out the printing paper humidifying method of the present invention will be described in detail below with reference to the accompanying drawings. [Embodiment] FIG. 1 schematically shows an embodiment of a printing paper humidifying apparatus for carrying out the printing paper humidifying method of the present invention.

The printing paper humidifying device of one embodiment is incorporated in a known rotary offset printing press, and in the known offset rotary printing press, a plurality of roll-shaped printing papers 12 held by a paper feeding device 10 are provided. The strip-shaped printing paper 12a pulled out from one of the inside is an in-feed tension device 14
It is supplied to the offset rotary press 16 after being set to a predetermined tension via. The offset rotary press 16 prints a predetermined image on the supplied belt-shaped printing paper 12a with a predetermined number of colors of ink, and prints the belt-shaped printing paper 12a.
Is supplied to the dryer 18, and the hot air from the dryer 18 dries the ink used for printing. The strip-shaped printing paper 12a exiting the dryer 18 is cooled by the cooling device 20 and then sent to the humidifying device 22 to be humidified by the humidifying device 22.

The humidifying device 22 of this embodiment includes an electric discharge machine 24 facing both sides of the strip-shaped printing paper 12a before the humidification, and the electric discharge machine 24 prints the strip before the humidification. Electric discharge machining is performed using corona discharge over the entire surface of both sides of the paper 12a. Due to this electric discharge machining, fine irregularities are generated on both sides of the strip-shaped printing paper 12a, and as a result, both sides of the strip-shaped printing paper 12a have the same water absorption rate irrespective of the respective surface treatments on both sides and the use status of the printing ink. To have. The electric discharge machine 24 may be configured to be capable of selectively electric discharge machining either one of both sides of the strip-shaped printing paper 12a, or may be arranged so as to face only one predetermined surface and perform electric discharge machining on only one predetermined surface. It can also be configured.

The humidifier 22 of this embodiment is the humidifier 2
In the moving direction of the strip-shaped printing paper 12a in 2, the water sprayer 26 is provided downstream of the electric discharge machine 24 on both sides of the strip-shaped printing paper 12a, and is arranged so as to surround the water sprayer 26. High electric field generator 2
Have eight. The water sprayed from the water sprayer 26 toward both sides of the printing paper 12a is decomposed into finer water droplets by the high electric field region generated by the high electric field generator 28, so that the water is evenly spread over both sides of the printing paper 12a. Can be humidified. Therefore, both sides of the strip-shaped printing paper 12a having the same water absorption rate by electric discharge machining have the same water content. The strip-shaped printing paper 12
The water content of both sides of a can be changed according to the amount of humidification from the water sprayer 26 per unit time and the moving speed of the strip-shaped printing paper 12a.

Strip-shaped printing paper 1 after leaving the humidifying device 22
2a is adjusted to have a predetermined tension by passing through the web path 30 and then supplied to the folder 32.

In the humidifying device 22, the humidifying amount per unit time from the water sprayer 26 is adjusted by the humidifying amount control means 34. The humidification amount control means 34 includes a data input device 36.
With this, it is possible to input a desired moisture content for the strip-shaped printing paper 12a.

The desired moisture content inputted is in the range of approximately 5% to approximately 6% in this embodiment. This is because the normal water content in the rolled printing paper 12 is in the range of approximately 5% to approximately 6%, and according to the conventional experience of the applicant, the water content of the printing paper 12a after passing through the humidifying device 22 is approximately 5%. If it is less than 5%, such a printing paper 12a later absorbs moisture in the air and expands, and if the water content of the printing paper 12a after passing through the humidifying device 22 is about 6% or more, such printing is performed. The paper 12a shrinks after discharging moisture into the air.

The humidifying device 22 of this embodiment is further provided on both sides of the strip-shaped printing paper 12a downstream of the water sprayer 26 and the high electric field generator 28 in the moving direction of the strip-shaped printing paper 12a in the humidifying device 22. It includes an opposed water content measuring device 38.

The water content measuring device 38 is a non-contact type, and measures the water content of the strip-shaped printing paper 12a at a plurality of positions on both sides of the strip-shaped printing paper 12a. The moisture content measuring device 38 sends a moisture content signal corresponding to the measured moisture content on both sides of the strip-shaped printing paper 12a to the humidification amount control means 34. The humidification amount control means 34 compares the desired moisture content signal input by the data input device 36 with the moisture content signal, and the water sprayer is made to match the moisture content signal received from the moisture content measuring device 38 with the desired moisture content. The amount of humidification per unit time from 26 is adjusted.

The output control of the electric discharge machine 24 may be performed by the humidification amount control means 34. In this case, although the humidification amount per unit time from the water sprayer 26 is adjusted based on the water content signal from the water content measuring device 38, only the actual water content lower than the desired water content is obtained. When it cannot be detected by the water content measuring machine 38, the output of the electric discharge machine 24 can be increased to increase the water absorption rate of the strip-shaped printing paper 12a. The output control of the electric discharge machine 24 by the water content measuring device 38 can be performed on both sides of the printing paper 12a.

In FIG. 2, a flow chart showing the operation of the humidification amount control means 34 of the humidification device 22 of the embodiment of FIG. 1 is shown by a solid line, and the humidification amount control means 34 controls the output control of the electric discharge machine 24. A flow chart for performing the operation is shown by a two-dot chain line.

[Another Embodiment] FIG. 3 schematically shows another embodiment of a printing paper humidifying apparatus for carrying out the printing paper humidifying method of the present invention.

As is apparent from FIG. 3, most of the construction of the other embodiment is of a printing paper humidifying device for carrying out the printing paper humidifying method of the present invention described above with reference to FIG. The structure is the same as most of the configuration of one embodiment, and the same components as those of the embodiment of FIG. 1 are designated by the same reference numerals, and detailed description of these components will be omitted.

In one embodiment of FIG. 1, the moisture content measuring device 38 is provided on the both sides of the strip-shaped printing paper 12a downstream of the water sprayer 26 and the high electric field generator 28 in the moving direction of the strip-shaped printing paper 12a in the humidifier 22. Although arranged so as to face each other, in another embodiment of FIG. 3, the water content measuring device 38 '
Is the only difference between the one embodiment and the other embodiment. The mobile water content measuring device 38 'is a strip-shaped printing paper 12 after being humidified.
If the water content on both sides of a can be measured,
It can be arranged at a position downstream of the water sprayer 26 and the high electric field generator 28 of the humidifying device 22 in the moving direction of the strip-shaped printing paper 12a. For example, it is cut into a predetermined length in the folding machine 32 and has a predetermined position. Printing paper 1 after being folded at
It is also possible to measure the water content on both sides of 2a.

[0029]

As described above in detail, according to the humidifying device and the humidifying method for a printing paper according to the present invention, the water content of each of the printing papers immediately before bookbinding can be surely set to a predetermined value. As a result, a step is not formed on the cut surface of a plurality of printing papers of a book or magazine after binding.

[Brief description of drawings]

FIG. 1 is a side view schematically showing an embodiment of a printing paper humidifying apparatus for carrying out the printing paper humidifying method of the present invention.

FIG. 2 is a flowchart showing the operation of the humidification amount control means of the humidifying device of the embodiment of FIG. 1 by a solid line, and the operation when the humidification amount control means performs output control of the electric discharge machine by a two-dot chain line.

FIG. 3 is a side view schematically showing another embodiment of a printing paper humidifying apparatus for carrying out the printing paper humidifying method of the present invention.

[Explanation of symbols]

10 ... Paper feeding device, 12 ... Roll-shaped printing paper, 12a ... Strip-shaped printing paper, 14 ... In-feed tension device, 1
6 ... Offset rotary press, 18 ... Dryer, 20 ... Cooling device, 22 ... Humidifying device, 24 ... Electric discharge machine, 26 ... Water atomizer, 28 ... High electric field generator, 30 ... Web path, 32 ...
Folding machine, 34 ... Humidification amount control means, 36 ... Data input device, 38, 38 '... Moisture content measuring machine.

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) B41F 23/00-23/04 F26B 13/00-13/30

Claims (2)

(57) [Claims] 1. A humidifying means for humidifying the printing paper after printing; a moisture content measurement for measuring a moisture content of a portion of the printing paper which is humidified by the humidifying means, and transmitting a moisture content signal corresponding to the measured moisture content. Means for receiving the water content signal from the water content measuring means, comparing the received water content signal with a desired water content, and printing paper after printing so that the received water content signal has a desired water content. And a humidifying amount control means for adjusting the humidifying amount by the humidifying means, and the printing paper has one side and the other side having different water absorption rates.
The water content measuring means is used to measure the water content of each side of the printing paper.
The water content is being measured, and the humidifier will include the data received on one side and the other side of the printing paper.
If the water content signal does not reach the desired water content, use the humidifying means.
Before the humidification, the electrical discharge machining was performed and the received moisture content signal was converted into the desired moisture content.
Electric discharge machine that improves the water absorption on the side that is less than the water rate
A humidifying device for printing paper , further comprising a step . 2. A humidifying means for humidifying the printing paper after printing.
Used in a printing machine with; water content of the printing paper humidified by the humidifying means
Moisture content measuring step for measuring moisture content ; Moisture content measured in moisture content measuring step and desired moisture content
Compared with the above, the measured water content becomes the desired water content.
Humidification to adjust the amount of humidification on the printing paper after printing
And a printing paper having one side and the other side having different water absorption rates.
In the water content measuring step, one side of the printing paper and the other side of the printing paper
The moisture content was measured, and the humidification method was measured on one side and the other side of the printing paper.
If the moisture content is less than the desired moisture content, add humidification means.
The water content measured by EDM before wetting becomes the desired water content.
The electrical discharge machining process that improves the water absorption of the surface that does not meet
It includes La, humidification method of the printing paper, characterized in that.