JP2004330560A - Print sheet drying device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a heating value carried out from a drying chamber by a print sheet, and to reduce solvent vapor of printing ink accompanying the print sheet sent out from the drying chamber. <P>SOLUTION: In the print sheet drying device, the drying chamber 1 forms a print sheet channel 4 from an inlet port 2 to an outlet port 3, and a belt-like print sheet a is heated during travelling on the print sheet channel 4 to evaporate the solvent of print ink to purify a part of air containing the solvent vapor in the drying chamber 1 for being discharged to atmosphere. The drying chamber 1 is provided with a heating region 5 on the inlet port 2 side and a non-heating region 6 on the outlet port 3 side. The heating region 5 is provided with heating air nozzles 11 for blowing heated air toward the print sheet channel 4 and a heated air circulating channel for heating the air to blow the heated air to the print sheet a with the heated air nozzles 11. The non-heated region 6 is provided with non-heated air nozzles 16 for blowing non-heated air toward the print sheet channel 4 and a non-heated air circulating channel for blowing the non-heated air toward the print sheet a with the non-heated air nozzles 16. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an apparatus for drying printing paper.
[0002]
[Prior art]
The web printing line has a high-speed offset printing machine, a drying machine, a cooling machine, and a folding machine arranged in order. In a high-speed offset printing press, a strip of paper unwound from a web is printed through a print roller. The belt-shaped printing paper that has passed through the printing machine passes through the hot air of the drying device and is heated to dry the printing ink. The band-shaped printing paper that has passed through the drying device is cooled by passing through the cooling roller of the cooling device. The band-shaped printing paper that has passed through the cooling device reaches a folding machine.
[0003]
The drying device using hot air has a drying chamber provided between the printing machine and the cooling device. The box-shaped drying chamber has a horizontally long rectangular entrance at the front end wall and a horizontally long rectangular exit at the rear end wall, and forms a printing paper path in the front-rear direction from the entrance to the exit. The band-shaped printing paper sequentially passes through the entrance of the drying chamber, the printing paper passage and the exit, and reaches the cooling device.
[0004]
The drying chamber is provided with a number of nozzles for blowing hot air above and below the printing paper path. Hot air blown from the nozzles hits the upper and lower surfaces of the belt-shaped printing paper passing through the printing paper path, and the solvent of the printing ink attached to the upper and lower surfaces evaporates. The printing ink on the upper and lower surfaces dries.
[0005]
A hot air circulation path is connected to the nozzle. The hot air circulation path heats the hot air blown out of the nozzle to heat the printing paper via a blower and a heating device, and supplies the heated hot air to the nozzle again. A purification path is connected to the drying chamber. The purifying path purifies a part of the hot air containing the solvent vapor of the printing ink inside the drying chamber via the blower and the purifying device and discharges the purified air to the atmosphere. The purifying device is a deodorizing device including a heating device and an oxidation catalyst.
[0006]
In the drying chamber, part of the hot air inside is released to the atmosphere through a purification path, and the inside becomes negative pressure. External fresh air flows into the drying chamber from the inlet and the outlet, respectively.
[0007]
[Problems to be solved by the invention]
However, in the conventional printing paper drying apparatus as described above, the printing paper passing through the hot air in the drying chamber has a room temperature such as 20 to 30 ° C. when passing through the entrance of the drying chamber. When passing through the outlet, the temperature becomes as high as about 120 ° C.
[0008]
Since the temperature at which the printing paper exits the drying chamber is much higher than the temperature at which the printing paper enters the drying chamber, the amount of heat carried away from the drying chamber by the printing paper, (mass of printing paper passing through the drying chamber) × (printing Specific heat of paper) x (temperature difference between entrance and exit of printing paper, high temperature-room temperature). Therefore, the drying device consumes a large amount of heat.
[0009]
Further, since the temperature of the printing paper entering the cooling device from the drying device is high, the cooling device requires a powerful device having a high cooling capacity and consumes a large amount of energy.
[0010]
In addition, since the printing paper entering the cooling device from the drying device is accompanied by the solvent vapor of the printing ink on the paper surface, when cooled by the cooling roller of the cooling device, the solvent vapor of the printing ink is condensed into tar and the tar of the solvent is removed. Stains the printing paper and cooling rollers.
[0011]
[Efforts to solve the problem]
In a conventional printing paper drying apparatus, in a drying chamber, air is heated and blown onto the printing paper, and the printing paper heated by blowing the heated air is taken out of the drying chamber as it is.
[0012]
Therefore, in the drying chamber, the inventor heats the air and blows it to the printing paper, and then blows the heated printing paper without heating the air to lower the temperature of the printing paper coming out of the drying chamber. At the same time, they came up with the idea of stripping solvent vapor of printing ink accompanying printing paper.
[0013]
In the drying chamber, in addition to the heating section for heating and blowing air to the printing paper, a non-heating section for blowing air without heating the printing paper heated in the heating section is provided.
[0014]
[Means for Solving the Problems]
1) The drying chamber is provided with an inlet and an outlet, and a printing paper path is formed from the inlet to the outlet. The strip-shaped printing paper sequentially passes through the inlet, the printing paper path, and the outlet of the drying chamber, and is running in the printing paper path. The printing paper drying apparatus provided with a purifying path that is configured to be heated to evaporate the solvent of the printing ink and evaporate a part of the air containing the solvent vapor in the drying chamber and release the air to the atmosphere.
The drying room has a heating zone on the inlet side and a non-heating zone on the outlet side,
The heating section is provided with a heating air nozzle that blows out heating air toward the printing paper passage, and a heating air circulation path that heats the air and blows the printing paper with the heating air nozzle,
The non-heating section is characterized in that a non-heating air nozzle that blows non-heating air toward the printing paper path is provided, and a non-heating air circulation path that blows the printing paper with the non-heating air nozzle without heating the air is provided. .
[0015]
2) In the printing paper drying apparatus described above,
The drying chamber is provided with a heating chamber serving as a heating area on the inlet side and a non-heating chamber serving as a non-heating area on the outlet side, and a printing paper passage penetrates a partition wall between the heating chamber and the non-heating chamber. Set up a passage,
In the heating chamber, part of the heated air inside is released to the atmosphere through a purification path, and outside fresh air flows in from the inlet, and unheated air in the non-heated chamber flows in from the passage, and Is characterized in that a part of the non-heated air inside flows out from the passage opening and the outside fresh air flows in from the outlet.
[0016]
3) In the printing paper drying apparatus described above,
The drying chamber is provided between the printing press and the cooling device, and a belt-shaped printing paper exiting from the printing press is configured to sequentially pass through the drying chamber and the cooling device.
[0017]
【The invention's effect】
In the drying chamber, the strip of printing paper is blown with heated air in the heating zone, evaporating the solvent of the printing ink and increasing the temperature. Unheated air is then blown in a non-heated area to lower the temperature and strip off the solvent vapor of the accompanying printing ink. The band-shaped printing paper coming out of the drying chamber has a lower temperature and a smaller amount of solvent vapor entrainment as compared with the conventional printing paper.
[0018]
Since the temperature of the printing paper as it leaves the drying chamber is reduced, the amount of heat carried away from the drying chamber by the printing paper is reduced. The dryer consumes less heat.
[0019]
Further, since the temperature of the printing paper entering the cooling device from the drying device is low, the cooling device does not require a powerful device having a high cooling capacity, and the energy consumption is reduced. In addition, since the amount of solvent vapor accompanying the printing paper entering the cooling device from the drying device is reduced, the possibility that the solvent tar contaminates the printing paper and the cooling device is reduced.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
In the printing line of the embodiment, as shown in FIG. 1, a high-speed offset printing press P, a drying device D, a cooling device C, and a folder F are sequentially arranged. In the printing press P, although not shown, a band-shaped paper is rewound from a web wound on a paper feeding unit, and the band-shaped paper is printed by passing through a print roller unit. The strip-shaped printing paper a sent out from the printing machine P at high speed passes through the drying device D and is heated, so that the printing ink adhering to the paper surface is dried. The printing paper a that has passed through the drying device D sequentially passes through a plurality of cooling rollers of the cooling device C and is cooled. The printing paper a that has passed through the cooling device C is sent to the folding machine F and is folded.
[0021]
As shown in FIG. 1, the drying device D has a drying chamber 1 provided between the printing press P and the cooling device C. The box-shaped drying chamber 1 has a horizontally long rectangular entrance 2 at the front end wall and a horizontally long rectangular exit 3 at the rear end wall, and forms a printing paper path 4 in the front-rear direction from the entrance 2 to the exit 3. . The band-shaped printing paper a sequentially passes through the inlet 2 of the drying chamber 1, the printing paper passage 4 and the outlet 3, passes through the drying chamber 1, and is sent to the cooling device C.
[0022]
In the drying chamber 1 having an elongated rectangular parallelepiped shape, the heating chamber 5 is located at the 3/4 position on the entrance 2 side, and the non-heating chamber 6 is located at the 1/4 position on the exit side. The partition wall between the heating chamber 5 and the non-heating chamber 6 is provided with a horizontally long rectangular passage opening 7 through which the printing paper passage 4 penetrates.
[0023]
The inside of the heating chamber 5 is a heating area. The elongated heating section is divided into three equal parts, and the first heating section 8, the second heating section 9 and the third heating section 10 are sequentially arranged from the inlet 2 side. The printing paper a passes through the first heating section 8, the second heating section 9 and the third heating section 10 sequentially through the inlet 2.
[0024]
Each of the heating zones 8, 9, 10 is provided with a heating air nozzle 11 for blowing heated air toward the printing paper passage 4 above and below the printing paper passage 4, respectively. Are arranged in a staggered manner with the printing paper path 4 interposed therebetween. In addition, each of the heating sections 8, 9, and 10 has a supply port 12 common to all the heating air nozzles 11 and a heating air circulation path that supplies heating air to the supply port 12.
[0025]
Each heating air circulation path connects the blower 13, the air volume adjusting valve 14 and the heating device 15 in order, opens the suction port of the blower 13 into the heating zone 8, 9 and 10, and connects the outlet of the heating device 15 to the heating zone. It is connected to the supply port 12. In each of the heating zones 8, 9 and 10, respectively, the heating air circulation passage heats the air inside the heating zone with the heating device 15 and circulates the heating air with the multiple heating air nozzles 11 through the printing paper path 4. It is sprayed on the upper and lower surfaces of the paper a.
[0026]
The inside of the non-heating chamber 6 is a non-heating area. After passing through the heating zones 8, 9 and 10, the belt-shaped printing paper a subsequently passes through the non-heating zone through the passage 7 and is sent to the cooling device C through the outlet 3.
[0027]
The unheated area is provided with unheated air nozzles 16 for blowing unheated air toward the print paper passage 4 above and below the print paper passage 4, respectively. They are arranged in a staggered manner with the printing paper path 4 interposed therebetween. Further, a supply port 17 common to all the non-heated air nozzles 16 is provided, and a non-heated air circulation path for supplying non-heated air to the supply port 17 is provided.
[0028]
The non-heated air circulation path connects the blower 18 and the air flow control valve 19, opens the suction port of the blower 18 in the non-heating area, and connects the discharge port of the blower 18 to the supply port 17 through the air flow control valve 19. Connected. In the unheated air circulation path without a heating device, the air in the unheated area is blown by a large number of unheated air nozzles 16 onto the upper and lower surfaces of the printing paper a traveling through the printing paper path 4 without heating.
[0029]
The drying chamber 1 is connected to the heating chamber 5 with a purification path for purifying a part of the heated air containing the solvent vapor therein and releasing the purified air to the atmosphere. The purifying path connects the blower 21, the heat receiving passage of the heat exchanger 22, the purifying device 23 and the heat radiating passage of the heat exchanger 22 sequentially, and connects the suction port of the blower 21 to the third heating section 10 of the heating chamber 5, The heat radiation passage of the heat exchanger 22 is open to the atmosphere. The purifying device 23 is a deodorizing device including a heating device and an oxidation catalyst.
[0030]
In the drying chamber 1, a part of the heating air in the heating chamber 5 is released to the atmosphere through a purification passage, and the inside of the heating chamber 5 has a negative pressure. Outside fresh air flows into the negative pressure heating chamber 5 from the inlet 2, and non-heating air inside the non-heating chamber 6 flows from the passage 7. In the non-heating chamber 6, a part of the non-heating air inside flows out from the passage port 7, and the inside becomes negative pressure. External fresh air flows into the negative pressure non-heating chamber 6 from the outlet 3.
[0031]
When the drying device D is operated, the blower 21 and the purification device 23 in the purification passage are operated, the blowers 13 and the heating device 15 in each heated air circulation passage are operated, and the blower 18 in the non-heated air circulation passage is operated. When the printing line is operated, the printing paper a passing through the drying device D travels through the printing paper path 4 of the drying chamber 1, and the entrance 2, the heating zones 8, 9, 10 of the heating chamber 5, the passage 7, and the non-heating It passes sequentially through the unheated section of chamber 6 and outlet 3.
[0032]
When the printing paper a sequentially passes through the heating zones 8, 9, and 10 of the heating chamber 5, the heating air is blown from a large number of heating air nozzles 11 on the upper surface and the lower surface, and the solvent of the printing ink attached to the upper surface and the lower surface is removed. It evaporates and the printing ink on the upper and lower surfaces dries. Further, the printing paper a has a temperature of about room temperature when passing through the inlet 2, passes through the heating air in the heating chamber 5, and rises in temperature and becomes high in temperature.
[0033]
When the printing paper a that has passed through the passage opening 7 in a high-temperature state passes through the non-heating section of the non-heating chamber 6, the non-heating air is blown from the many non-heating air nozzles 16 on the upper surface and the lower surface, and the temperature decreases. . The printing paper a has a lower temperature when passing through the outlet 3 than when passing through the passage 7. That is, the printing paper a passes through the non-heating area of the non-heating chamber 6 and is cooled.
[0034]
Further, the printing paper a enters the non-heating chamber 6 through the passage opening 7 with the solvent vapor of the printing ink on the upper and lower surfaces, and a large number of printing papers are formed on the upper and lower surfaces in the non-heating area of the non-heating chamber 6. Unheated air is blown from the non-heated air nozzle 16 to remove the solvent vapor of the printing ink accompanying the upper surface and the lower surface. When the printing paper a passes through the outlet 3, the amount of the solvent vapor of the printing ink accompanying the printing ink 7 is lower than when the printing paper a passes through the passage 7. That is, the printing paper a passes through the non-heating area of the non-heating chamber 6 and the accompanying amount of the solvent vapor decreases.
[0035]
In the drying apparatus D of the embodiment, the paper surface temperature of the printing paper a changes as illustrated in FIG. At the time of passing through the inlet 2, the temperature is about 30 ° C., which is slightly higher than room temperature. The temperature rises sharply in the first heating section 8, slowly rises in the second heating section 9, and falls slightly below the maximum temperature of 120 ° C., falls slowly in the third heating section 10, and reaches about 100 ° C. when passing through the passage 7. It is. It descends further in the non-heating zone and reaches about 80 ° C. when passing through the outlet 3.
[0036]
In the conventional example having no non-heating chamber 6 or non-heating area, the paper surface temperature of the printing paper is about room temperature when entering the drying chamber and about 120 ° C. when exiting the drying chamber. Compared with this conventional example, in the drying apparatus D of the embodiment, the amount of decrease in the temperature when the printing paper a passes through the outlet 3 is about 40 ° C. (about 120 ° C.−80 ° C. =). The amount by which the amount of heat carried away from the drying chamber 1 by the printing paper a is reduced, and the amount saved is proportional to the amount of temperature reduction when the printing paper a passes through the outlet 3. The amount of heat saved is, for example, (mass of printing paper a passing through drying chamber 1 at 3100 kg / h) × (specific heat of printing paper a, 0.32 kcal / kg ° C.) × (printing paper a when passing through outlet 3 of printing paper a) (Temperature drop, about 40 ° C.) = 40000 kcal / h.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a printing line and its vicinity in a preferred embodiment of the present invention.
FIG. 2 is a diagram showing a temperature change on a printing paper surface in the drying apparatus according to the embodiment of the present invention.
[Explanation of symbols]
P High-speed offset printing machine D Drying device C Cooling device F Folder a Band-shaped printing paper 1 Drying room 2 Drying room entrance, heating room entrance 3 Drying room exit, non-heating room exit 4 Drying room printing paper path 5 heating chamber, heating section 6 non-heating chamber, non-heating section 7 passage, outlet of heating chamber, entrance of non-heating chamber 8 first heating section of heating chamber 9 second heating section of heating chamber 10 third of heating chamber Heating section 11 Heated air nozzle 12 Supply port 13 Blower for heated air circulation path 14 Air flow regulating valve for heated air circulation path 15 Heating device for heated air circulation path 16 Non-heated air nozzle 17 Supply port 18 Blower 19 for unheated air circulation path Air flow regulating valve 21 for unheated air circulation path 21 Blower for purification path 22 Heat exchanger for purification path 23 Purification device for purification path, deodorization device

Claims (3)

The drying chamber is provided with an inlet and an outlet, and a printing paper path is formed from the inlet to the outlet.The strip-shaped printing paper passes through the inlet, the printing paper path, and the outlet of the drying chamber sequentially, and is heated while traveling in the printing paper path. In a drying device provided with a purifying path for purifying a part of the air containing the solvent vapor in the drying chamber and discharging the air to the atmosphere, the solvent of the printing ink is evaporated to be evaporated.
The drying room has a heating zone on the inlet side and a non-heating zone on the outlet side,
The heating section is provided with a heating air nozzle that blows out heating air toward the printing paper passage, and a heating air circulation path that heats the air and blows the printing paper with the heating air nozzle,
The non-heating section is characterized in that a non-heating air nozzle that blows non-heating air toward the printing paper path is provided, and a non-heating air circulation path that blows the printing paper with the non-heating air nozzle without heating the air is provided. Printing paper drying equipment. The drying chamber is provided with a heating chamber serving as a heating area on the inlet side and a non-heating chamber serving as a non-heating area on the outlet side, and a printing paper passage penetrates a partition wall between the heating chamber and the non-heating chamber. Set up a passage,
In the heating chamber, part of the heated air inside is released to the atmosphere through a purification path, and outside fresh air flows in from the inlet, and unheated air in the non-heated chamber flows in from the passage, and The printing paper drying apparatus according to claim 1, wherein a part of the unheated air inside flows out from the passage opening, and the outside fresh air flows in from the outlet. 3. The printing apparatus according to claim 1, wherein the drying chamber is provided between the printing machine and the cooling device, and the belt-shaped printing paper sent from the printing machine passes through the drying chamber and the cooling device sequentially. Paper drying equipment.

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