JPH08240387A - Drier - Google Patents

Abstract

PURPOSE: To provide a drier capable of adjusting the velocity of drying gas jetted from upper and lower both nozzle groups with one air amount adjusting damper and a variable speed motor. CONSTITUTION: There are provided an upper nozzle group 4 facing the upper surface of a web feed passage R, a lower nozzle group 5 facing the lower surface of the web feed passage R, and an air fan passage 27 for communication of the upper and lower both nozzle groups 4, 5 with the air fan 26. For the fan 26 a variable speed motor is used as a motor for rotating a blade 26c, and an air amount adjusting damper 3 is disposed at a location 27c communicating with only any one of the nozzle groups on the air passage 27, and no air amount adjusting damper is disposed at the location 27b communicating with only the other nozzle group on the air passage 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a drying device for ejecting a drying gas at an appropriate temperature onto the upper and lower surfaces of a sheet-shaped web such as paper, plastic film or metal foil which passes through a web feeding path. The term "drying" as used herein refers to a drying treatment of a coating agent applied to a web or an impregnating agent impregnated in a web, or a heating treatment of heating the web itself to a desired temperature.

[0002]

2. Description of the Related Art Conventionally, as a drying device for ejecting a drying gas onto the upper and lower surfaces of a web, there are those shown in a perspective view of FIG. 4 and a front view of FIG. The drying device 1 includes a drying chamber 2 in which a web guide passage R is penetrated along the front-rear direction and a drying chamber 2
From the ducts that connect the upper nozzle group 4 and the lower nozzle group 5 that eject the drying gas toward the web inner conduit R, the upper and lower nozzle groups 4 and 5 and the discharge area 6a of the blower 6 And a reflux passage 8 formed in the drying chamber 2 so as to guide the gas ejected from both the upper and lower nozzle groups 4 and 5 to the suction area 6b of the blower 6, and heating provided in the middle of the ventilation passage 7. And a container 9.

Each of the upper and lower nozzle groups 4 and 5 is formed by joining a plurality of nozzle boxes 3 which are long in the left-right direction to a distribution duct 10 which is long in the front-rear direction at appropriate intervals. The blower path 7 extends from the discharge area 6a of the blower 6 by one path 7a, and branches into two paths 7b, 7c from the middle to communicate with the upper and lower distribution ducts 10, 10. The blower 6 is driven by a motor 11 that rotates the impeller 6c at a constant speed. The heater 9 is composed of a gas burner arranged in one path 7a of the air passage 7 or a heat exchanger using steam as a heat medium, and controls the drying gas supplied to the nozzle groups 4 and 5 to a desired temperature. Is. The drying chamber 2 includes an exhaust passage 12 for exhausting a part of the dried gas.

The drying apparatus 1 levitates the web W by ejecting a drying gas from the nozzle boxes 3 of the upper and lower nozzle groups 4 and 5 toward the web W passing through the web guide passage R. Dry while supporting in the floating state. By the way, the drying device 1 transmits to the web W such that the wind speed of the drying gas ejected from each nozzle box 3 of both the upper and lower nozzle groups 4 and 5 toward the web W can be individually adjusted above and below. It is necessary to make the amount of heat to be different between the upper and lower surfaces of the web W and to adjust the floating state of the web W. Therefore, in the drying device 1, as shown in FIG. 5, the air volume adjusting damper 13 is arranged in each of the two paths 7b and 7c where the air path 7 is branched.

[0005]

However, disposing the air flow rate adjusting damper 13 in each of the two passages 7b and 7c of the air blowing passage 7 complicates the internal structure of the drying chamber 2 and reduces the manufacturing cost of the drying device 1. It is difficult to operate while synchronizing the wind velocities of the drying gas ejected from both the upper and lower nozzle groups in order to maintain the floating state of the web W.

In order to solve the above problems, it is an object of the present invention to provide a drying device capable of adjusting the wind speed of a drying gas ejected from both upper and lower nozzle groups without disposing two air amount adjusting dampers. .

[0007]

SUMMARY OF THE INVENTION The gist of the present invention according to claim 1 is to provide an upper nozzle group facing the upper surface of a web feed channel,
In a drying device including a lower nozzle group facing the lower surface of a web air guide passage and an air blow passage that connects both upper and lower nozzle groups and a blower, the blower is a variable speed motor as a motor for rotating an impeller. Is used, an air flow rate adjustment damper is arranged at a position communicating with only one of the nozzle groups in the air flow path, and an air flow rate adjustment damper is arranged at a position communicating with only the other nozzle group of the air flow path. It is a drying device characterized by not being performed. The gist of the present invention according to claim 2 is that the air passage is
2. The drying device according to claim 1, wherein when the air volume adjusting damper is fully opened, the nozzle blowing wind speed of the one nozzle group is set to be higher than the nozzle blowing wind speed of the other nozzle group.

[0008]

According to the present invention, the drying gas is blown out from both upper and lower nozzle groups by changing the rotation speed of the impeller with a variable speed motor to increase or decrease the amount of air blown by the blower. The wind speed of can be adjusted at the same time. By changing the opening of the air volume adjustment damper, it is possible to adjust the difference between the wind speed of the drying gas ejected from the other nozzle group and the wind speed of the drying gas ejected from the one nozzle group.

According to the second aspect of the present invention, by changing the opening degree of the air volume adjusting damper, the nozzle blowing wind speed of one nozzle group is faster or slower than the nozzle blowing wind speed of the other nozzle group. can do.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A drying apparatus according to the present invention will be described below with reference to the embodiments shown in the drawings. 1 to 3 show an embodiment of a drying apparatus according to the present invention, FIG. 1 is a schematic diagram showing an outline of the whole, FIG. 2 is a front view of the drying apparatus, and FIG. 3 is a nozzle blowing air speed adjustment. It is a graph which shows three modes.

The improvement of the drying device 21 of the present embodiment is that a variable speed motor is used as the motor 31 for rotating the impeller 26c of the blower 26, and a branch point communicating only with the nozzle group 5 below the air passage 27. The air volume adjustment damper 33 is disposed at 27c, and the air volume adjustment damper is not disposed at the branch point 27b in the air passage 27 that communicates only with the upper nozzle group 4. The structure of the drying device 21 is substantially the same as that of the conventional drying device 1 (see FIGS. 4 and 5) except for the improvement.

That is, the drying device 21 includes a drying chamber 2 which penetrates the web feed path R along the front-rear direction, and a drying chamber 2.
From the ducts that connect the upper nozzle group 4 and the lower nozzle group 5 that eject the drying gas toward the web inner conduit R, and the upper and lower nozzle groups 4 and 5 and the discharge area 26a of the blower 26. Blower 27 and upper and lower nozzle groups 4,
The recirculation passage 8 is formed in the drying chamber 2 so as to guide the gas ejected from the blower 5 to the suction area 26b of the blower 26, and the heater 9 arranged in the middle of the passage 27a of the air passage 27.
Further, each of the upper and lower nozzle groups 4 and 5 is formed by joining a plurality of nozzle boxes 3 that are long in the left-right direction to a distribution duct 10 that is long in the front-rear direction at appropriate intervals. The air duct 27
Extends from the discharge area 26a of the blower 26 by a single path 27a, and branches into two paths 27b, 27c from the middle to communicate with the upper and lower distribution ducts 10, 10. The drying chamber 2 includes an exhaust passage 12 for exhausting a part of the dried gas.

The blower 26 uses a variable speed type motor as a motor 31 for rotationally driving the impeller 26c, and the rotational speed of the impeller 26c is adjusted to adjust the discharge area 2
The amount of air discharged from 6a to the air passage 27 can be changed to a desired value. The motor 31 is appropriately selected from an AC vector control type, a DC control type, an eddy current coupling type, etc. so that the output shaft can be varied in speed.

The air volume adjusting damper 33 arranged at the branch point 27c of the air passage 27 is provided with an operation tool 34 for adjusting the opening, and the operation of the operation tool 34 changes the damper opening from fully open to fully closed or fully closed. It can be adjusted to a close condition. As shown in Japanese Patent Publication No. 6-59442, the operation tool 34 is configured to receive an emergency command signal and operate the damper opening urgently to a fully closed state or a state close to a fully closed state. When the air volume adjustment damper 33 is fully closed or nearly closed by operating the operation tool 34, the drying gas is ejected from the upper nozzle group 4 facing the coating surface side of the web guide passage R while the web is being ejected. The ejection of the drying gas from the lower nozzle group 5 facing the non-coated surface side of the guide passage R can be stopped or set to a very small amount. As a result, in an emergency, the coating surface of the web W is not brought into contact with the upper nozzle group 4 facing the coating surface side of the web guide passage R, and the coating material of the web W is attached to the upper nozzle group 4. You can avoid the situation.

The air passage 27 has branch points 27b and 2
The ventilation resistance of 7c is set in advance as follows. That is,
The branch points 27b and 27c are set so that, when the air volume adjusting damper 33 is fully opened, the nozzle blowing wind speed of the lower nozzle group 5 is made faster than the nozzle blowing wind speed of the upper nozzle group 4. With this setting, the opening degree of the air volume adjustment damper 33 is changed by operating the operation tool 34 to change the nozzle blowing wind speed of the lower nozzle group 5 to that of the upper nozzle group 4 as shown in FIG. 3 (A). It may be the same as the nozzle air velocity, or it may be adjusted faster or slower.

The air duct 27 has a branch point 27b.
It is also possible to set the ventilation resistances of 27 and 27c in advance as follows in accordance with the usage conditions of the drying device 21 without setting them as described above. As an example thereof, when the air volume adjustment damper 33 is fully opened, the lower nozzle group 5
That is, the nozzle blowing wind speed of No. 1 and the nozzle blowing wind speed of the upper nozzle group 4 are set to be the same. With this setting, by operating the operation tool 34 to change the opening degree of the air volume adjustment damper 33, the nozzle blowing wind speed of both the upper and lower nozzle groups 4 and 5 can be adjusted as shown in FIG. 3B. You can Further, as another example, when the air volume adjusting damper 33 is fully opened, the nozzle blowing wind speed of the lower nozzle group 5 is set to be slower than the nozzle blowing wind speed of the upper nozzle group 4. With this setting, the opening degree of the air volume adjustment damper 33 is set to the operation tool 3
As shown in FIG. 3C, it is possible to adjust the nozzle blowing wind speed of both the upper and lower nozzle groups 4 and 5 by operating and changing the nozzle group 4 in FIG.

In the drying device 21, the lower surface side of the web guide passage R is the non-coated surface side, and the air flow rate adjusting damper 33 is arranged at the branch point 27c communicating with only the lower nozzle group 5 in the blower path 27. . However, the drying device according to the present invention is not limited to this embodiment, and although not shown in the drawings, when the upper surface side of the web air guide path R is the non-coated surface side, the upper part of the air flow path 27 is not shown. The air volume adjustment damper 33 may be arranged at the branch point 27b communicating only with the nozzle group 4, and the air volume adjustment damper may not be arranged at the branch point 27c communicating only with the nozzle group 5 below the air passage 27. Further, the drying device according to the present invention may be used in a posture in which the web feeding guide path R is in a horizontal state or, although not shown, in a posture in which the web feeding guide path R is in a vertical state or an inclined state. is there.

[0018]

As described in detail above, the drying apparatus according to the present invention has the following excellent effects. According to the first aspect of the present invention, since the wind speed of the drying gas ejected from each of the upper and lower nozzle groups can be adjusted by the variable speed motor and the single air volume adjusting damper, the internal structure of the drying chamber can be simplified. The manufacturing cost of the drying device can be reduced, and the wind speed of the drying gas ejected from both the upper and lower nozzle groups can be easily controlled at the same time.

According to the second aspect of the present invention, by adjusting one air volume adjusting damper, the nozzle blowing wind speed of one nozzle group can be made faster or slower than the nozzle blowing wind speed of the other nozzle group. It is possible to adapt to various drying conditions with a simple operation.

[Brief description of drawings]

FIG. 1 shows an embodiment of a drying device according to the present invention, and is a schematic diagram showing an overview of the whole.

FIG. 2 is a front view of the drying device according to the embodiment.

FIG. 3 is a graph showing three modes of adjusting the nozzle blowing air velocity in the example.

FIG. 4 is a perspective view showing a conventional drying device.

FIG. 5 is a front view showing a conventional drying device.

[Explanation of symbols]

 R ... Web feeding channel 4 ... Upper nozzle group 5 ... Lower nozzle group 26 ... Blower 26c ... Impeller 27 ... Blower 27b, 27c ... (branch) point 33 ... Air volume adjustment damper

Claims (2)

[Claims] 1. An upper nozzle group which faces the upper surface of the web guide passage, a lower nozzle group which faces the lower surface of the web guide passage, and a blower passage which connects both the upper and lower nozzle groups and a blower. In the drying device, the blower uses a variable speed motor as a motor for rotationally driving an impeller, and an air flow rate adjustment damper is arranged at a position in the air passage communicating with only one of the nozzle groups. An air volume adjusting damper is not arranged at a place communicating only with the other of the nozzle groups in the passage. 2. The air passage is formed so that when the air volume adjusting damper is fully opened, the nozzle blowing air velocity of the one nozzle group is higher than the nozzle blowing air velocity of the other nozzle group. 1. The drying device according to 1.