JP2000079678A - Dry managing apparatus for printed matter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manage a dry state of a printed matter to obtain a desired dry state by detecting a moisture content of the matter and controlling a temperature and an air volume of a dryer based on the detected result. SOLUTION: The dry managing apparatus 1 for a printed matter comprises a display unit 10 made of a monitor or the like, a dry controller 20, and a detecting unit 30 having a light source 32 and a detector 36. Here, the unit 30 has a function of detecting a moisture content of the matter. The controller 30 obtains the relationship between the content of the matter and an optimum dry condition according to a preliminary experiment, obtains optimum temperature and air volume to drying from a measured result of the content of the matter by the unit 30, and controls so that the dry state of the matter always becomes constant. A suitable installing position of the detector 36 is desirably a position immediately after an output of a drying unit 6 for correctly grasping the dried state. Thus, a predetermined dry state of the matter is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drying management device for drying a printed material at the time of printing such as offset printing and gravure printing.

[0002]

2. Description of the Related Art Heretofore, in offset printing or gravure printing, the dry state of a printed material is determined by a printing operator visually observing the dry state of a printed book to determine whether the dry state is appropriate. The temperature and air volume are manually changed in consideration of the dry state.

[0003]

According to the above-mentioned method, in the case of printing which is wound up after printing on a web roll-shaped printing paper, the printed book cannot be picked up by hand, and it is difficult to make a visual judgment and accurate Dry condition cannot be determined.

[0004] Confirming the dry state off-line after winding up the web-roll-shaped printed matter requires much time and effort to confirm the printed matter inside the roll, even though the printed matter outside the roll can be confirmed. Further, in the offline measurement, when it is determined that the dry state is inappropriate, all of the take-up rolls become defective prints, and there is a time lag between printing and determination, and there is a possibility that defective prints increase. Large loss.

[0005] As described above, visual judgment and off-line judgment have problems in accuracy and time. In addition, regarding the importance of proper drying condition management, if the drying of wound prints is insufficient, printing failures called blocking and set-off will occur. If the printing paper is paper, or under dry conditions with excessive air flow, printing troubles such as fire wrinkles and back cracks may occur. It is very important to control the drying conditions of the printed material in this way.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described points, and has as its object to provide a drying management apparatus capable of managing a drying state based on a moisture content of a printed material during printing such as offset printing or gravure printing.

[0007]

According to the present invention, there is provided a detecting device for detecting a moisture content of a printed matter, a display device for displaying a drying state such as a moisture content obtained by the detecting device, and a drying device based on the moisture content. And a controller for controlling the temperature and air volume of the machine.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a printed matter drying management apparatus according to the present invention will be described with reference to the drawings. FIG.
FIG. 1 is a diagram showing a configuration of a drying management device according to the present invention.

The printed matter drying management apparatus 1 of the present invention comprises a display device 10 such as a monitor, a control device 20 and a light source 3.
1 and a detection device 30 including a detector 35. Here, the detecting device 30 has a function of detecting the moisture content of the printed matter. The control device 20 obtains the relationship between the moisture content of the printed material and the optimal drying conditions by a preliminary experiment, obtains the optimal temperature and air volume for drying from the measurement result of the moisture content of the printed material by the detection device 30, and determines the drying state of the printed material. Is controlled to be constantly constant.

FIG. 2 shows a case where the drying control apparatus 1 of the present invention is installed and used in gravure printing as an example.

After the printing paper in the form of a web roll is printed on the plate copper 3 by the pressure copper 4, the printing paper passes through the guide roller 5 and is sent to the drying device 6. The drying device 6 includes a first drying hood 7 and a second drying hood 8. The temperature and air volume of the drying device 6 are adjusted by the control device 10. In the present invention, the temperature and air volume of the first drying hood 7 and the second drying hood 8 are adjusted in accordance with the moisture content of the web-rolled printing paper.

Further, a suitable installation position of the detector 35 is a position where the drying hood 7 exits or a position where the detector 35 exits the second drying hood 8. The position immediately after leaving is desirable.

FIG. 3 shows an embodiment of a detector 35 for detecting a dried state of a printed matter used in the printed matter drying management apparatus 1 of the present invention, and will be described below.

The detector 35 comprises a light source 31 (white light source such as a halogen lamp), an optical filter section 36 and a light receiving section 34, and the light λ output from the light source section 31 is a filter 36.
Is reflected by the web-rolled printed matter 2 and received by the light receiving unit 34 (photo sensor). Reference numeral 33 denotes an optical lens system of the light source unit 31. The optical filter unit 36
With two optical filters, for example, filter a
40 is a reference light λ as light having a wavelength not affected by moisture.
1 and the filter b41 transmits the moisture measurement light λ2 as light having a wavelength capable of absorbing only moisture. Light receiving unit 34
Has two sensors, an optical sensor having the same filter a40 mounted on the front surface and an optical sensor having the same filter b41 mounted on the front surface.
1 and the moisture measurement light λ2 can be received by separate light receiving sensors.

The reference light λ1 and the moisture measurement light λ2 received by the light receiving section 34 are converted into electric signals (current value or voltage value), and a light reception amount r1 and a light reception amount r2 are obtained. Equation (1) T = log ₁₀ (r1 / r2) Absorbance T is obtained from equation (1). Here, as the moisture content of the printed matter increases, the light absorption increases and the amount of received moisture measurement light r
2 becomes small, and the value of the absorbance T becomes large. On the other hand, as the moisture content of the printed matter is smaller, the light absorption is smaller, the received light amount r2 of the moisture measurement light is larger, and the value of the absorbance T is smaller.
Thus, the dried state of the printed matter can be recognized online from the moisture content, and the dried state of the printed matter can be managed.

Next, the overall operation of the drying management apparatus according to the present invention will be described with reference to FIG.

First, the detecting device 30 detects the moisture content of the printed matter, and displays the result on the display device 10 as a value (step 1).

Next, if the moisture content is within the preset proper drying range, the process returns to step 1 in FIG. if,
If the moisture content is out of the set range, the process proceeds to step 4.

Next, the drying control device 20 controls the set temperature and the set air volume of the drying device 6 so as to obtain an appropriate drying state. The process is repeated until the numerical value of the moisture content falls within the set range, so that the dried state of the printed matter is managed in the set state.

[0020]

As described above, according to the present invention, drying of printed matter can be controlled so as to obtain a desired dried state.

[0021]

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of a printed matter drying management device according to the present invention.

FIG. 2 is a diagram showing a configuration in a case where the printed matter management apparatus according to the present invention is installed and used in gravure printing as one embodiment.

FIG. 3 is a diagram showing an embodiment of a detector for detecting the moisture content of a printed material used in the printed matter drying management device according to the present invention.

FIG. 4 shows an operation flowchart of the entire printed matter drying management apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printed matter drying management device 2 Web roll-shaped printing paper 3 Plate cylinder 4 Impression cylinder 5 Guide roller 6 Drying device 7 First drying hood 8 Second drying hood 10 Display device 20 Drying control device 30 Detection device 31 Light source 32 Optical lens system 33 Optical fiber 34 Light receiving unit 35 Detecting device 36 Optical filter 37 Support shaft 40 Filter a 41 Filter b

[Reference number] P09890329 Drawing 1

[Reference number] P09890329 Drawing 2

[Reference number] P09890329 Drawing 3

[Reference number] P0980329 Drawing 4 Display device Control device Drying device Detecting device Light source Detector 6 10 20 30 34 32 36 1 36 36 36 5 8 7 2 4 3 5 Moisture content within proper drying conditions (Step 3) Moisture content The drying state of the drying device is displayed on the display device 10 (Step 2). The temperature setting and the air volume setting of the drying device 6 are controlled so that the moisture content is within the appropriate drying conditions (Step 4). Of water content in water (Step 1) No

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[Procedure amendment]

[Submission date] September 8, 1998 (1998.9.8)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Explanation of sign

[Correction method] Change

[Correction contents]

[Description of Signs] 1 Printed matter drying management device 2 Web roll-shaped printing paper 3 Plate cylinder 4 Impression cylinder 5 Guide roller 6 Drying device 7 First drying hood 8 Second drying hood 10 Display device 20 Drying control device 30 Detecting device 31 Light source 32 Optical lens system 33 Optical fiber 34 Light receiving unit 35 Detecting device 36 Optical filter 37 Support shaft 40 Filter a 41 Filter b

Claims (2)

[Claims] 1. A detecting device for detecting a moisture content of a printed matter, a display device for displaying a drying state such as a moisture content obtained by the detecting device, and controlling a temperature and a flow rate of a dryer based on the moisture content. A drying management device, comprising: a control device. 2. The drying management device according to claim 1, wherein the detection device optically detects the moisture content.