JPH04104442U - Paper surface temperature control device - Google Patents

Abstract

(57) [Summary] [Purpose] The temperature of the paper surface passing through the cooling cylinder of the cooling device can be maintained at a preset temperature input. [Structure] Cooling device 5 having multiple cooling cylinders 8
A temperature measuring device 12 for measuring the surface temperature of the paper a that has passed through the cooling cylinder 8 is provided on the exit side of the cooling cylinder 8.
is connected to a regulator 11 which emits a signal when the measured temperature is higher than a set temperature inputted in advance, and the cooling cylinder 8 is
It is characterized in that the operating valve 13 provided on the cooling water discharge side of the pump is controlled.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is applied to the cooling device of a rotary printing press to automatically set the paper surface temperature. The present invention relates to a paper surface temperature control device that controls the temperature.

0002

[Conventional technology]

Figure 2 shows the layout of a blanket-to-blanket type offset rotary printing press. show. This rotary printing machine has a paper feed device 1, an infeed device 2, a printing unit 3, and a drive. It consists of a dryer 4, a cooling device 5, a web path 6, and a folding machine 7. The strip of paper (hereinafter referred to as paper) that is fed out from the roll paper installed in the machine 1 has multiple prints. Multicolor ink printed on both sides in unit 3 and transferred to paper in dryer 4 After drying, the cooling device 5 cools the paper surface and sets the ink. , and enters the folding machine 7 via the web path 6.

0003 The cooling device 5 is provided with a plurality of cooling cylinders 8, and inside these cylinders, Cooling water is circulated to cool the paper surface. (See Figure 1)

0004

[Problem that the idea aims to solve]

The surface temperature of the paper that has passed through the cooling device is determined by the running speed of room temperature paper, the paper width, and the characteristics of the ink. It changes depending on the printing conditions such as the dryer temperature, which is determined according to the printing conditions. Also, the surface temperature of paper If the temperature is not lower than the set surface temperature, the ink will not solidify sufficiently and the The printed image is smudged or distorted.

[0005] For this reason, conventionally, when looking at the paper surface discharged from the folding machine, the cooling cylinder cools the paper. Evaluate the degree of cooling, and if there is insufficient cooling, adjust the opening of the valve or on-off valve to release cooling water. The amount is increasing. However, this type of control method is time-consuming and requires precise control. It was difficult to maintain.

[0006] This invention was developed to deal with this problem, and the surface temperature of paper is The purpose is to automatically maintain the set surface temperature.

[0007]

[Means to solve the problem]

The configuration of the present invention to achieve the above object will be explained using FIG. 1 corresponding to an embodiment. To be clear, the present invention provides a cooling device on the outlet side of a cooling device 5 having a plurality of cooling cylinders 8. A temperature measuring device 12 is provided to measure the surface temperature of the paper that has passed through the cylinder 8. The measured temperature of the measuring instrument 12 is determined by comparing the measured temperature with a preset temperature input. is connected to a regulator 11 which emits a signal when the The feature is that the operating valve provided on the cooling water discharge side of the cooling cylinder 8 is controlled. shall be.

[0008]

[Effect]

In addition, the present invention uses the above-mentioned method to determine the temperature of the paper measured by the temperature measuring device in advance. If the temperature is higher than the set temperature, the controller will issue a signal and this command will turn the cooling cylinder on. Cooling water flows through the cooling cylinder by controlling the operating valve installed on the cooling water discharge side of the cylinder. Increase the amount to cool the cooling cylinder and lower the paper surface temperature.

[0009]

【Example】

FIG. 1 shows a control system diagram of the paper surface temperature control device according to the present invention. 8 to cooling device 5 A plurality of cooling cylinders are shown, and the inside of the cooling cylinder 8 is connected from the supply line. The cooling water passes through and cools the outer circumferential surface of the cooling cylinder 8. The water is then discharged to a cooling water tank (not shown) or to the outside.

0010 Next, it runs through a dryer to dry the multicolored ink printed on the paper. The paper a, which has been heated during this time and whose temperature has increased, runs along the outer peripheral surface of the cooling cylinder 8. During this time, heat is carried away and the web runs from the outlet side of the cooling device 5 toward the web path. Infrared radiation temperature to measure the surface temperature of paper a coming out from the outlet side of this cooling device 5 A temperature measuring device 12 consisting of a temperature meter is provided, and the temperature is measured with this measuring device 12. The temperature is input to the regulator 11, and the paper surface temperature is set in advance in the regulator 11. When the measured temperature is high, the controller 11 is set so that the temperature is lower than the paper setting temperature. sends a command signal to the operating valve 13 operated by the rotary motor 15 and valve operating motor 16. put out. Based on this signal, the operating valve 13 expands the cooling water passage of this valve to increase the amount of cooling water. Make the paper surface temperature lower than the set paper surface temperature.

[0011] In addition, in order to lower the paper surface temperature, if excess cooling water is flowed into the cooling cylinder 8, the cooling cylinder Da 8 becomes too cold and condensation occurs from the atmosphere around the cylinder. If it adheres to the outer surface, it will cause trouble for the paper, so please check the set paper surface temperature or this temperature. The temperature should be slightly lower than that. In other words, the paper becomes close to the outside temperature and does not shrink any more. It is necessary to maintain the paper surface temperature at which the ink solidifies.

0012 Next, an infrared radiation thermometer 14 is used as a temperature measuring device. Therefore, the precision of the measured temperature The degree is good.

[0013]

[Effect of the idea]

In this way, according to the present invention, the outlet of a cooling device having multiple cooling cylinders is A temperature measuring device is installed on the side to measure the surface temperature of the paper that has passed through the cooling cylinder. The measured temperature of the instrument is higher than the measured temperature and the pre-entered set temperature. The cooling cylinder is connected to a regulator that outputs a signal, and the cooling of the cooling cylinder is controlled through the signal of the regulator. The cooling cylinder is designed to control the operating valve installed on the cooling water discharge side. When the temperature of the paper passing through is higher than the preset temperature, the operating valve is controlled and the cooling system is activated. The amount of water used to cool the cylinder is increased and the paper surface temperature drops below the set paper surface temperature, so the paper stops shrinking. The ink is solidified, and there is no staining on the printing surface or deformation of the image, and good printing is obtained. Since the paper surface temperature is dynamically and continuously measured and set as the set paper surface temperature, printing conditions such as room temperature , paper surface temperature that changes due to changes in paper running speed, dryer temperature, ink characteristics, etc. This has effects such as being able to always keep the temperature at the set paper surface temperature.

[Brief explanation of drawings]

FIG. 1 is a control system diagram showing an embodiment of the present invention.

FIG. 2 is a side view showing an example of the layout of a rotary printing press.

[Explanation of symbols]

5 Cooling device 8 Cooling cylinder 11 Regulator 12 Temperature measuring device 13 Operating valve

Claims (1)

[Scope of utility model registration request] Claim 1: A temperature measuring device for measuring the surface temperature of the paper that has passed through the cooling cylinders is provided on the outlet side of a cooling device having a plurality of cooling cylinders, and the measured temperature is inputted in advance to the temperature measuring device. The cooling cylinder is connected to a regulator that issues a signal when the measured temperature is higher than the set temperature, and the operating valve provided on the cooling water discharge side of the cooling cylinder is controlled via the signal from the regulator. Features a paper surface temperature control device.