JP2014083822A - Device and method for hot-air drying of printing paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot-air drying device capable of reducing consumption of thermal energy and suppressing outflow of hot air.SOLUTION: A hot-air drying device 1 of printing paper includes: a dry chamber 10 having an inlet 12 and an outlet 14 through which printing paper P can pass; a nozzle 18 arranged in the dry chamber 10, for spraying heated gas on the printing paper P; a discharge passage 39 having an air blower 30 and a deodorization unit 34, in order to discharge exhaust gas in the dry chamber 10; a printing paper passage chamber 40 arranged at the inlet 12 and/or the outlet 14 of the dry chamber 10, and having an inlet 42 and an outlet 44 through which the printing paper P can pass; an inflow passage 60 having an air blower 52 for making fresh air flow in from the printing paper passage chamber 40 to the dry chamber 10; and a heat exchanger 38 for heating the fresh air with the exhaust gas having passed the deodorization unit 34.

Description

  The present invention relates to a hot air drying apparatus and method for printing paper that dries the printing paper with hot air.

  In general, an offset printing press includes a printing device that applies ink to a strip-shaped printing paper, and a drying device that is disposed downstream of the printing press and evaporates the ink. The drying device includes a large number of nozzles directed toward the printing surface, and ink is evaporated by blowing high-temperature heated gas using combustion gas from the nozzles onto the printing surface. Furthermore, the drying device is equipped with a direct combustion method or a deodorizing device using a catalyst or the like, and the exhaust air containing the solvent component used for drying the ink is processed into the deodorizing device and then released to the atmosphere. . During the purification process in the deodorizing device, the exhaust air becomes hot. In order to effectively use exhaust heat, heat is being recovered and reused by using a heat exchanger. However, even after recovery, the exhaust air discharged into the atmosphere has a temperature of 250 ° C to 370 ° C.

  Further, the drying device takes in fresh air from the inlet and the outlet of the printing paper so that the solvent vapor due to the printing ink is not released outside the drying device. The fresh wind has a temperature of 20 ° C to 30 ° C. Therefore, when fresh air flows into the drying device, the temperature in the drying device decreases. In particular, as the temperature difference between fresh air and dry air increases, the amount of heat energy consumed increases.

  In order to cope with the above problem, Patent Document 1 provides a hot air chamber on the front side of the drying chamber, the hot air chamber has an inlet and an outlet, and heats fresh air with high-temperature exhaust gas after purification in the purification exhaust passage. A hot air supply path for supplying hot air after heating to the hot air chamber is provided, the hot air in the hot air chamber flows into the drying chamber from the inlet of the drying chamber, a detector for detecting the pressure of the hot air chamber is provided, and the detection of the detector There is described a hot air drying device for printing paper, which is provided with a control device for controlling the hot air supply flow rate in the hot air supply passage in accordance with the pressure, and maintains the pressure of the hot air chamber almost the same as the outdoor atmospheric pressure.

Japanese Patent No. 4800087

  The hot air drying apparatus for printing paper of Patent Document 1 includes a pressure detector and a control device that controls the supply flow rate of hot air in order to maintain the pressure of the hot air chamber substantially the same as the atmospheric pressure outside the room. Therefore, the apparatus becomes complicated and expensive.

  Further, when a problem occurs in the pressure detector or the control device, the pressure in the hot air chamber and the atmospheric pressure outside the chamber are not the same, and there is a problem that solvent vapor is released from the drying chamber.

  The present invention has been made in view of such circumstances, and provides a hot air drying apparatus and method for printing paper that can suppress consumption of thermal energy and suppress the release of solvent vapor with a simple configuration. Objective.

  A hot air drying apparatus for printing paper according to the present invention includes a drying chamber having an inlet and an outlet that allow the printing paper to pass through, a nozzle that is disposed in the drying chamber and blows heated gas onto the printing paper, and the drying chamber. A discharge passage having a blower and a deodorizing device, and an inlet and an outlet disposed at the inlet and / or the outlet of the drying chamber to allow the printing paper to pass therethrough. A paper passage chamber, an inflow passage having a blower for flowing fresh air from the printing paper passage chamber into the drying chamber, and a heat exchanger for heating the fresh air with the exhaust gas that has passed through the deodorizing device. .

  According to the present invention, the paper passes through the printing paper passage chamber installed at the inlet and / or outlet of the drying chamber, the fresh air inflow passage connecting the printing paper passage chamber and the drying chamber, and the deodorization device of the discharge passage. Since it is comprised only with a simple apparatus provided with the heat exchanger of exhaust gas and fresh air, it can comprise cheaply and can supply hot air to a drying chamber efficiently and reliably. Since no pressure detector or flow control device is used, there is no danger of hot air flowing out of the drying chamber when the pressure detector or the like fails.

  The hot air drying method for printing paper according to the present invention is a hot air drying method for printing paper, in which the printing paper is dried by passing through a drying chamber having an inlet and an outlet, and a heating gas is applied to the printing paper in the drying chamber. A step of spraying, a step of deodorizing and discharging the exhaust gas from the drying chamber, and a flow of fresh air from the printing paper passage chamber arranged in communication with the inlet and / or the outlet of the drying chamber. And after exchanging heat with each other, flowing into the drying chamber.

  According to the present invention, hot air can be efficiently and reliably supplied to the drying chamber. Moreover, there is no danger of hot air flowing out of the drying chamber.

  ADVANTAGE OF THE INVENTION According to this invention, the hot air drying apparatus and method of printing paper which can suppress consumption of a thermal energy and can suppress that solvent vapor | steam is discharge | released with a simple structure can be provided.

Schematic which shows the hot air drying apparatus of the printing paper which concerns on this invention. Schematic which shows the hot air drying apparatus of the other printing paper which concerns on this invention. Schematic which shows an example of the Example of this invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. The present invention is described by the following preferred embodiments, but can be modified in many ways without departing from the scope of the present invention, and other embodiments than the present embodiment are utilized. be able to. Accordingly, all modifications within the scope of the present invention are included in the claims.

  FIG. 1 is a schematic view of a hot air drying apparatus for printing paper according to the present embodiment. The hot air drying apparatus 1 is an apparatus that is disposed on the downstream side of a printing press (not shown), and that dries ink while passing the printing paper P delivered from the printing press to remove the solvent component of the ink. The hot air drying apparatus 1 has a drying chamber 10 having an inlet 12 and an outlet 14 that allow the printing paper P to pass therethrough. The printing paper P is conveyed from the inlet 12 into the drying chamber 10, passes through the drying chamber 10, and is sent out of the drying chamber 10.

  The drying chamber 10 includes a plurality of chambers 16, and each chamber 16 includes a plurality of nozzles 18 directed toward the printing paper P. The chamber 16 communicates with the heating device 20 and the blower 22. Air in the drying chamber 10 is sent from the blower 22 to the heating device 20, heated by the heating device 20, and heated gas (100 ° C. to 250 ° C.) is blown onto the printing paper P from the nozzle 18 of the chamber 16. The shape of the nozzle 18 is not limited as long as the heated gas can be sprayed.

  The ink is dried by the heated gas blown from the nozzle 18. The exhaust gas containing the solvent component used for drying the ink is led out from the drying chamber 10 to the gas pipe 32 by the blower 30 and sent to the deodorizing device 34. The deodorizing device 34 is a catalytic oxidation type deodorizing device. In the deodorization device 34, the exhaust gas is heated by a heating device (not shown), passed through the oxidation catalyst in a high temperature state, and deodorized by an oxidation combustion reaction. The exhaust gas that has passed through the deodorizing device 34 is discharged to the atmosphere at 250 ° C. to 370 ° C.

  The exhaust gas sent out from the deodorizing device 34 is led out to the gas pipe 36 and sent to the heat exchanger 38. The exhaust gas that has passed through the heat exchanger 38 is released to the atmosphere. The exhaust gas released into the atmosphere is heated to 200 ° C. to 300 ° C. by heat exchange. The blower 30, the gas pipe 32, the deodorizing device 34, and the gas pipe 36 constitute an exhaust gas discharge path 39.

  As shown in FIG. 1, a printing paper passage chamber 40 is installed on the inlet 12 side of the drying chamber 10. The printing paper passage chamber 40 includes an inlet 42 and an outlet 44 that allow the printing paper P to pass therethrough. The outlet 44 of the printing paper passage chamber 40 and the inlet 12 of the drying chamber 10 are arranged without a gap so as to be at the same position. The printing paper P passes through the inlet 42 and the outlet 44 and is conveyed to the drying chamber 10. A part of the printing paper passage chamber 40 and part of the drying chamber 10 can be shared, and the outlet 44 of the printing paper passage chamber 40 and the inlet 12 of the drying chamber 10 can be shared.

  A gas pipe 50 is connected to the printing paper passage chamber 40, and the gas pipe 50 is connected to a blower 52. A gas pipe 54 is connected to the blower 52, and the gas pipe 54 is connected to the heat exchanger 38. A gas pipe 56 is connected to the heat exchanger 38, and the gas pipe 56 is connected to the drying chamber 10. The fresh air in the printing paper passage chamber 40 is led out to the gas pipe 50 by the blower 52 and sent to the heat exchanger 38. In the heat exchanger 38, heat exchange is performed between the exhaust gas and the fresh air, and the fresh air is heated to 200 ° C to 250 ° C. The inflow path 60 is configured by the printing paper passage chamber 40, the gas pipe 50, the blower 52, the gas pipe 54, the gas pipe 56, and the drying chamber 10. The heated fresh air is sent into the drying chamber 10. The fresh air taken into the printing paper passage chamber 40 is heated and sent into the drying chamber 10 through the inflow path 60. The fresh air is air taken from the outside through the entrance 42 of the printing paper passage chamber 40.

  Operation | movement of the hot air drying apparatus 1 of this embodiment is demonstrated. First, the blowers 22, 30, 52, the heating device 20, and the deodorizing device 34 are operated. The printing paper P is set from the printing machine to the conveyance path and conveyed to the hot air drying device 1. The printing paper P passes through the printing paper passage chamber 40 and is conveyed to the drying chamber 10. In the drying chamber 10, the gas is supplied to the chamber 16 heated by the heating device 20, and heated gas is blown toward the printing paper P from the nozzle 18 of the chamber 16.

  The exhaust gas containing the solvent component is led out from the drying chamber 10 to the gas pipe 32 by the blower 30 and sent to the deodorizing device 34. Thereby, the inside of the drying chamber 10 becomes a negative pressure. The exhaust gas is deodorized by the deodorizing device 34, and the exhaust gas after passing through the deodorizing device 34 has a temperature of 200 ° C to 300 ° C. The exhaust gas passes through the heat exchanger 38 and is released to the atmosphere.

  The fresh air in the printing paper passage chamber 40 is sent to the heat exchanger 38 through the gas pipes 50 and 54 by the blower 52. As a result, the printing paper passage chamber 40 has a negative pressure, and fresh air is easily taken into the printing paper passage chamber 40 from the outside. The fresh air taken into the printing paper passage chamber 40 from the outside has a temperature of 20 ° C to 30 ° C. The fresh air having a temperature of 20 ° C. to 30 ° C. is heat-exchanged with the exhaust gas having a temperature of 250 ° C. to 300 ° C. in the heat exchanger 38 and heated to 200 ° C. to 250 ° C. Fresh air of 200 ° C. to 250 ° C. is sent to the drying chamber 10 through the gas pipe 56. Since the temperature difference between the fresh air flowing into the drying chamber 10 and the heated gas can be reduced, the heat energy consumed by the heating device 20 can be reduced.

In A4 landscape sided four-color offset rotary press, a hot air drying apparatus 1 (1 ') is placed, when the warm fresh air of approximately 25 ° C. per minute 20 m ³ to about 200 ° C., it is about 20% of the energy savings .

  When the pressure in the drying chamber 10 is lower than the pressure in the printing paper passage chamber 40, fresh air in the printing paper passage chamber 40 passes through the opening 44 (48) and flows into the drying chamber 10. Since the printing paper passage chamber 40 is sucked by the blower 52, it is possible to prevent fresh air from flowing from the printing paper passage chamber 40 to the outside, particularly toward the printing press.

  As another embodiment of the present invention, a printing paper passage chamber 40 may be installed inside the drying chamber 10 as in the hot air drying device 1 ′ of FIG.

  In the hot air drying apparatus 1 ′ of FIG. 2, the printing paper passage chamber 40 is formed inside the drying chamber 10 by a partition plate 46. The printing paper passage chamber 40 ′ is installed on the inlet 12 side of the drying chamber 10. The partition plate 46 has an opening 48 and serves as an outlet 44 of the printing paper passage chamber 40. The printing paper P passes through the inlet 42 of the printing paper passage chamber 40 that also serves as the inlet 12 of the drying chamber 10 and the outlet 44 of the printing paper passage chamber 40, and heated gas is supplied from the nozzle 18 of the chamber 16 in the drying chamber 10. Be sprayed.

  As shown in FIG. 1, a printing paper passage chamber may be provided outside the drying chamber. However, by providing a partition sheet inside the drying chamber as shown in FIG. Since it is comprised, it can comprise more cheaply and can supply a hot air to a drying chamber efficiently and reliably.

  1 and 2, the example in which the printing paper passage chambers 40 and 40 ′ are installed at the inlet 12 of the drying chamber 10 has been described. However, the printing paper passage chambers 40 and 40 ′ may be installed at the outlet 14 of the drying chamber 10. The printing paper passage chambers 40 and 40 ′ may be installed at both the inlet 12 and the outlet 14 of the drying chamber 10.

Next, as an example, the printing paper passage chambers 40, 40 ′ are installed at both the inlet 12 and the outlet 14 of the drying chamber 10, and exhaust gas of 50 Nm ³ (0 ° C., 1 atm conversion air volume) per minute from the drying chamber 10. The case where it exhausts with the air blower 30 is demonstrated.

FIG as shown in 3, when exhausted by blower A per minute 50 Nm ³ of exhaust gas from the drying chamber, the drying chamber becomes negative, for example, every minute 20 Nm 3 from the inlet of the hot air drying apparatus per ^minute 30 Nm ³ from the outlet Fresh air flows in. Of fresh air total per minute 50 Nm ^3, for example, every minute from the inlet side 15 Nm ^3, fresh air total per minute 35 Nm ³ per minute 20 Nm ³ from the outlet side is taken from the printing paper passes through chamber by blower B, Heat is exchanged with the exhaust gas by a heat exchanger and sent to the drying chamber.

Here, the printing paper passes through chamber drying chamber per minute from the drying chamber inlet 5 Nm ^3, fresh air per minute 10 Nm ³ from the drying chamber outlet flows directly. Thereby, it is suppressed that a hot solvent vapor | steam is discharge | released from a drying chamber.

  DESCRIPTION OF SYMBOLS 1,1 '... Hot air drying apparatus, 10 ... Drying chamber, 16 ... Chamber, 18 ... Nozzle, 22, 30, 52, A, B ... Blower, 34 ... Deodorizing device, 38 ... Heat exchanger, 39 ... Discharge path, 40, 40 '... printing paper passage chamber, 46 ... partition plate, 60 ... inflow path, P ... printing paper

Claims (2)

A drying chamber with an inlet and an outlet allowing printing paper to pass through;
A nozzle that is disposed in the drying chamber and blows heated gas onto the printing paper;
In order to discharge the exhaust gas of the drying chamber, a discharge path having a blower and a deodorizing device,
A printing paper passage chamber disposed at the inlet and / or the outlet of the drying chamber and having an inlet and an outlet for allowing the printing paper to pass through;
An inflow path having a blower for flowing fresh air from the printing paper passage chamber to the drying chamber;
A heat exchanger that heats the fresh air with the exhaust gas that has passed through the deodorizing device;
A hot-air drying device for printing paper. A hot-air drying method for printing paper that dries the printing paper by passing through a drying chamber having an inlet and an outlet,
Spraying heated gas on the printing paper in the drying chamber;
Deodorizing and exhausting the exhaust gas from the drying chamber;
A step of flowing fresh air from a printing paper passage chamber communicated with the inlet of the drying chamber and / or the outlet and exchanging heat with the exhaust gas, and then flowing into the drying chamber;
A hot air drying method for printing paper containing

Images