JPH05106964A - Sealing structure of sheet passage in dryer - Google Patents

Abstract

PURPOSE:To prevent the flow out of a drier gas from a sheet passage port. CONSTITUTION:A drier 1 is provided with a sheet passage R which penetrates in a main body 2a where there are installed nozzles 3 to eject gas G and a sheet passage opening 4 which is the inlet of the sheet passage R. A plurality of sealing boards 11 and 12 are vertically installed to the sheet passage inlet 4 or its vicinity in the direction across the sheet passage R. There is formed an exhaust space between the adjacent sealing boards 11 and 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet passage opening sealing structure for a dryer, which seals a sheet passage opening formed in a dryer to prevent gas inside the apparatus from flowing out of the body. is there. The dryer referred to in the present document includes not only a drying agent for the coating agent applied to the sheet and the sheet itself, but also a drying apparatus for heating the coating agent and the sheet for heating and curing.

[0002]

2. Description of the Related Art Conventionally, there is a dryer shown in a sectional view of FIG. In this dryer 1, nozzles 3, 3 ... for penetrating a sheet passage R through the inside 2a of the machine body 2 and ejecting a gas G having an appropriate temperature into the sheet passage R are provided in the machine body 2a, and serve as an entrance and exit of the sheet passage R. The sheet passage opening 4 is formed in both wall portions 2b of the machine body 2 (the drawing shows only the exit side).

In the dryer 1, nozzles 3, 3 ... Are arranged on the upper and lower sides of the sheet passage R, and the gas S ejected from the nozzles 3, 3 ... Flows the sheet S passing through the sheet passage R. It is of a form to be tinged. In addition to the floating type, although not shown in the drawing, the dryer is provided with a plurality of guide rolls below the sheet passage and a plurality of nozzles above the sheet passage as appropriate for each pitch. There is also a support system.

The gas G ejected from each of the nozzles 3 is sprayed onto the sheet S and then separated from the sheet S to be recirculated to the recirculation space A between the nozzles 3 or 3 or to the outside of the body from the sheet passage port 4. To do. The amount of gas G flowing out of the seat passage port 4 to the outside of the fuselage increases as the gas velocity ejected from the nozzle 3 increases. This is because the velocity of the gas G flowing along the surface of the sheet S increases and the gas G travels straight toward the sheet passage opening 4.

In particular, in the floating type dryer 1, as the stability of the floating is improved, the speed of the gas G ejected from the nozzle 3 can be increased, so that the sheet passage port 4 is exposed outside the machine body. The amount of gas G flowing out to is also large.

[0006]

However, letting out a large amount of gas G from the seat passage port 4 to the outside of the machine causes the following problems.

(A) A large amount of solvent gas components generated by the drying process flow out from the sheet passage port 4 to the outside of the machine, which significantly deteriorates the working environment in the factory where the dryer is installed.

(B) In the dryer of the inert gas drying system in which the oxygen concentration is lowered by purging the inside of the machine with an inert gas and the concentration of the organic solvent gas generated by drying etc. is increased, the high concentration of the outflowing gas is used. There is a risk of explosion due to the organic solvent gas from the factory filling up. Moreover, releasing expensive inert gas is very uneconomical.

In order to solve the above problems, the present invention provides
An object of the present invention is to provide a seal structure for a seat passage opening in a dryer that prevents the gas inside the machine from flowing out of the seat passage opening to the outside of the machine.

[0010]

The first means adopted by the present invention is a doorway through which a seat passage is penetrated into the body, and a nozzle for ejecting gas is provided in the body passage to form the seat passage. In a dryer having a sheet passage opening in the machine body, a plurality of sealing plates extending in the transverse direction of the sheet passage are provided in the vicinity of the sheet passage opening or the sheet passage opening, and the longitudinal ends of the sealing plates approach the sheet passage. A sheet passage opening sealing structure in a dryer, characterized in that an exhaust space is formed between adjacent sealing plates.

A second means adopted by the present invention is the first means described above.
In the above means, the seal plate is bent toward the longitudinal tip toward the inside of the machine body.

A third means adopted by the present invention is the first means described above.
Alternatively, in the second means, a plurality of sets of sealing members made up of a plurality of the sealing plates are housed inside a sealing box, and a circulation path is formed between an exhaust space of the sealing device and the inside of the sealing box to circulate A circulation fan is provided in the middle of the passage, an exhaust passage is extended from the middle of the circulation passage, and an inert gas supply passage is connected to the seal box.

[0013]

In the first means, the gas ejected from the nozzle is blown onto the sheet passing through the sheet passage, and then a part thereof flows along the surface of the sheet and goes straight toward the seal plate. However, since the gap formed between the longitudinal tip of the seal plate and the sheet is narrow, the gas passage resistance is also large. Therefore, only a part of the gas that has reached the gap passes through the gap, and the remaining part collides with the seal plate and is diverted to the direction of separating from the sheet. The gas that has passed through the gap is diffused in the exhaust space to reduce its velocity and is discharged from the exhaust space. Therefore, there is no or very little gas flowing out of the fuselage from the gap between the longitudinal ends of the adjacent seal plates and the sheet.

In the second means, since the longitudinal end of the seal plate is bent toward the inside of the body, the gas that collides with the seal plate smoothly changes the direction inside the body.

In the third means, a part of the gas discharged from the exhaust space of the sealer due to the activation of the circulation fan is discharged to the outside of the machine through the exhaust passage, and the rest is the seal box. Return to the inside. The returned gas passes between the seal tool and the seal box together with the inert gas replenished into the seal box through the inert gas inflow passage, and the gap formed between the longitudinal tip of the seal plate and the sheet. Then, circulation is performed by passing through this gap and flowing into the exhaust space. Therefore, since the circulating inert gas flows into the exhaust space through the gap between the seal plate and the sheet on the outer side of the fuselage, once the gas ejected from the nozzle is introduced into the exhaust space, the seal member has this gap. Gas does not flow out of the exhaust space.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A seal structure for a sheet passage opening in a dryer according to the present invention (hereinafter referred to as "the present invention structure") will be described below with reference to the embodiments shown in the drawings.

(First Embodiment) FIGS. 1 and 2 show a first embodiment of the structure of the present invention. FIG. 1 shows a seat passage R.
2 is a front sectional view, and the left half thereof is CC of FIG. 1.
It is a cross section taken along a line.

The feature of this embodiment is that the seal members 10, 10 are provided near the seat passage opening 4 in the inside 2a of the machine body 2. In the present embodiment, only the sheet outlet side of the sheet passage opening 4 is shown, but the seal tools 10, 10 may be provided on the sheet inlet side of the sheet passage opening 4 as necessary. In this embodiment, the nozzles 3, 3 ... Connected to the duct 5 are arranged above and below the seat passage R inside the machine body 2a.
The point that the sheets G passing through the sheet passage R are floated by the gas G, G, ...

The seal member 10 is a seal plate 1 extending in the transverse direction of the sheet passage R (the direction of arrow D shown in FIG. 2).
1 and 12 are provided upright so that the longitudinal ends 11a and 12a of the seal plates 11 and 12 are brought close to the sheet passage R so that gaps E and F are formed between the longitudinal ends 11a and 12a and the sheet S. I am doing it.

The seal plates 11 and 12 are bent toward the inside of the body at the longitudinal ends thereof, and the gas scooping pieces 11b and 12b.
Has been formed. An exhaust space 13 is formed between the seal plates 11 and 12. The exhaust space 13 incorporates a rectifier 14 formed of a perforated plate or the like extending in the transverse direction of the sheet passage R, and has exhaust holes 15, 15 ... Opened in place to communicate with the recirculation region 2a-1 inside the machine body 2a. I am doing it. Reflux area 2a-
As for 1, the location where the static pressure is lower than that of the exhaust space 13 is selected.

The seal members 10, 10 are provided with a seat passage R.
It may be provided so as to be able to advance and retreat toward the sheet passage R so that the leading edge of the sheet S does not collide when the sheet S is first passed. In addition, the sealing tool 10, 1
0 may be provided in the seat passage opening 4.

Next, the flow of the gas G in this embodiment will be described. Gases G, G ... Ejected from the nozzles 3, 3 ...
While floating the sheet S, a part thereof flows along the surface of the sheet S and goes straight toward the seal tool 10. When the gas G that travels straight reaches the seal member 10, only a part of the gas G passes through a gap E having a large passage resistance formed between the longitudinal tip 11a of the seal plate 11 and the sheet S, and the rest is the seal plate. It collides with the gas scooping piece 11b of 11 and separates from the sheet S and changes direction to the recirculation region 2a-1.

The gas G that has passed through the gap E enters the exhaust space 13 so as to diffuse, the speed of the gas G is reduced, and the gas G passes through the discharge holes 15, 15 ... And is guided to the recirculation region 2a-1.
Therefore, the gas G flowing out of the fuselage from the gap F between the longitudinal tip 12a of the seal plate 12 and the sheet S to the outside of the machine is none or very small.

(Second Embodiment) FIGS. 3 and 4 show a second embodiment of the structure of the present invention. FIG. 3 shows a seat passage R.
3 is a side sectional view taken along the conveyance direction (arrow B direction), and FIG. 4 is a front sectional view showing the right half taken along line HH of FIG.

A feature of this embodiment is that a sealing device 20 is provided outside the machine body 2 near the seat passage port 4. In this embodiment, only the sheet outlet side of the sheet passage opening 4 is shown, but the sealing device 20 may be provided on the sheet inlet side of the sheet passage opening 4 as necessary. In this embodiment, the nozzles 3, 3 are provided on the upper and lower sides of the seat passage R in the machine body 2.
Are arranged and the gas G, G ... Gushed from the nozzles 3, 3 ...
The point that the sheet S passing through the sheet path R is floated is the same as that of the conventional drying device 1 shown in FIG. 7.

In the sealing device 20, a pair of sealing members 21 and 22 are housed one above the other in an interior 23a of a seal box 23 through which the sheet passage R penetrates. Both seals 2
Between 1 and 22, and the seal tool 22 and the inner wall surface 23f of the seal box
An air volume adjusting damper 29 is arranged in each of the spaces.

Each of the sealing members 21 and 22 is composed of an exhaust duct 25 extending in the transverse direction of the seat passage R and two or three sealing plates 26 each having a longitudinal root side 26c joined to the exhaust duct 25. Become. Each seal plate 26 has its longitudinal tip 26a brought close to the sheet passage R, and forms a gap J (K, L) between the longitudinal tip 26a and the sheet S.

The seal plate 26 is bent toward the inside of the machine at the longitudinal end thereof to form a gas scooping piece 26b. An exhaust space 27 is formed between the seal plates 26, 26. The exhaust space 27 is a discharge hole 2 opened in a proper place.
8 and 28 ... Communicate with the exhaust duct 25, and a rectifier (not shown) made of a perforated plate or the like is provided if necessary.

The sealing members 21, 21 are the exhaust duct 2
A return duct 31 is provided between the air conditioner 5 and 25 and the body 2a. The return duct 31 is provided with a return fan 32 in the middle thereof as required.

The sealing members 22, 22 are the exhaust duct 2
A circulation path 34 is formed by a duct between 5, 25 and the inside of the seal box 23. The circulation passage 34 is provided with a circulation fan 35 in the middle thereof, an exhaust passage 36 is extended from an appropriate position, and an inert gas supply passage 37 is connected to the downstream side of the circulation fan 35. The inert gas supply path 37 may be connected to the inside of the seal box 23 without the circulation path 34.

The seal box 23 is designed so that it can be divided into upper and lower parts, and the butt flange portions 23c and 23c are joined together.
A packing 23d is arranged between c (see FIG. 4). Further, the sealing device 20 may be configured to be vertically separable when the sheet S is first passed through the sheet passage R.

Next, the flow of the gas G in this embodiment will be described. Gases G, G ... Ejected from the nozzles 3, 3 ...
While floating the sheet S, a part thereof flows along the surface of the sheet S and goes straight toward the seal member 21. When the gas G that travels straight reaches the seal member 21, only a part of the gas G passes through the gap J having a large passage resistance formed between the longitudinal tip end 26a of the seal plate 26 and the sheet S, and the rest is the seal plate. It collides with the gas scooping piece 26b of 26, separates from the sheet S, and changes direction to the in-machine 2a.

The gas G that has passed through the gap J flows into the exhaust space 27 and diffuses to reduce its velocity, and the exhaust holes 28, 28.
.. from the exhaust duct 25, and is guided to the inside 2a of the machine body via the return duct 31. Therefore, the next seal plate 26
From the gap K between the longitudinal tip 26a of the sheet and the sheet S, the seal box 2
The gas G flowing into the inside 23a of No. 3 is none or very small.

In each seal member 22, the static pressure in the exhaust space 27 becomes lower than the static pressure in the seal box interior 23a as the inert gas circulates between the exhaust duct 25 and the seal box interior 23a. Therefore, the small amount of gas G flowing out from the gap K of the seal member 21 and the outside air flowing into the seal box interior 23a from the seat passage port 23e of the seal box 23 are sucked into the exhaust space 27 through the gaps J and K. .. Circuit 3
The exhaust passage 3 has an air volume slightly larger than the sucked air volume.
The air is discharged to the outside via 6, and the supply of the amount of the inert gas corresponding to the discharged air amount is received from the inert gas supply passage 37 to maintain the air amount balance.

(Third Embodiment) FIG. 5 shows a third embodiment of the structure of the present invention.
FIG. 6 is a side cross-sectional view showing an embodiment and being a cross-section taken along a conveyance direction of a sheet passage R (arrow B direction).

This embodiment is different from the second embodiment in that the inside 23a of the seal box 23 is divided by a partition plate 39, and the seal tool 21 is arranged inside the seal box 23a-1.
Is connected to an inert gas supply passage 40 for supplying the inert gas returned from the solvent recovery device (not shown) of the dryer 1. Except for this difference, the second embodiment is substantially the same as the second embodiment, and thus the description thereof is omitted here.

(Fourth Embodiment) FIG. 6 shows a fourth embodiment of the structure of the present invention.
FIG. 6 is a side cross-sectional view showing an embodiment and being a cross-section taken along a conveyance direction of a sheet passage R (arrow B direction).

The difference of this embodiment from the third embodiment is that the gas scooping piece portion 30b is formed by bending the longitudinal ends of the seal plates 30 constituting the seal member 24 toward the outside of the machine body. That is. Except for this difference, the third embodiment is substantially the same as the third embodiment, and therefore the description thereof is omitted here.

The present embodiment is provided on the sheet entrance side of the sheet passage opening 4, and is used when the sheet S is carried into the dryer 1 at a high speed. The external air that is carried in while adhering to the surface of the sheet S that is carried in at high speed is scooped by the gas scooping piece 30b of the seal plate 30 together with the inert gas supplied to the inside 23a-1 of the seal box, and seals. Entry into the tool 22 is blocked.

(Other Embodiments) In the first to fourth embodiments, the dryer 1 is of the floating type, and seal structures are provided on the upper and lower sides of the sheet passage R, respectively. However, in the guide roll supporting type dryer in which the nozzles are arranged only on one side of the sheet passage, the structure of the present invention may be provided only on the side where the nozzles are arranged.

Further, in the second to fourth embodiments, only one set of the upper and lower sealing members 22, 22 is arranged. However, the structure of the present invention is not limited to one set of the sealing members 22, 22, and a plurality of sets may be arranged along the conveyance direction of the sheet passage R as the ejection speed of the nozzle 3 increases.

[0042]

As described above in detail, the present invention has the following excellent effects. In the first means, there is no or very little gas flowing out of the fuselage from the gap between the sheet and the longitudinal tip of the seal plate on the outer side of the fuselage. As a result, the structure of the present invention prevents a large amount of solvent gas components generated by drying from flowing out of the machine through the sheet passage opening, and maintains a good working environment in the factory where the dryer is installed. You can

The second means smoothly changes the direction of the gas that has collided with the seal plate inside the body. As a result, the structure of the present invention can maintain the smooth running of the seat without causing the seat to flap due to the gas that collides with the seal plate.

In the third means, the gas does not flow out of the fuselage from the gap between the sheet and the longitudinal tip of the seal plate on the outer side of the fuselage, and the inert gas is replenished in the seal box. The gas can maintain the concentration of the inert gas circulating in the seal box and the sealer at a constant value. As a result, the structure of the present invention, in the inert gas drying system,
Since no inert gas containing a high concentration of organic solvent gas will flow out of the aircraft from the seat passage opening, a safe factory environment without explosion hazard can be maintained, and the release of expensive inert gas is minimized. You can maintain economy.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the structure of the present invention, and is a side sectional view taken along the conveyance direction of a sheet passage R (arrow B direction).

2 is a front view of the above, the left half of which is C in FIG. 1;
It is a cross section taken along line -C.

FIG. 3 shows a second embodiment of the structure of the present invention, and is a side cross-sectional view taken along the conveyance direction of the sheet passage R (arrow B direction).

FIG. 4 is a front sectional view showing a right half sectioned along a line HH in FIG.

FIG. 5 shows a third embodiment of the structure of the present invention, and is a side sectional view taken along the conveyance direction of the sheet passage R (arrow B direction).

FIG. 6 shows a fourth embodiment of the structure of the present invention, and is a side sectional view taken along the conveyance direction of the sheet passage R (arrow B direction).

FIG. 7 is a side sectional view of a conventional dryer.

[Explanation of symbols]

1 ... Dryer 2 ... Aircraft 3 ... Nozzle 4 ... Seat passage port R ... Seat passage 11 (12,26) ...
Seal plate 13 (27) ... Exhaust spaces 21, 22 ...
Sealing tool 23 ... Sealing box 34 ... Circulation path 35
... Circulation fan 36 ... Exhaust passage 37 ... Inert gas supply passage

Claims (3)

[Claims] 1. A dryer in which a sheet passage is penetrated into the machine body, a nozzle for ejecting gas to the seat passage is provided in the machine body, and a sheet passage opening serving as an entrance and exit of the sheet passage is provided in the machine body. A plurality of sealing plates extending in the transverse direction of the seat passage are erected near the passage opening or the seat passage opening, with the long ends of the sealing plates approaching the seat passage, and an exhaust space is formed between adjacent sealing plates. A seal structure for a sheet passage opening in a dryer characterized by the above. 2. The sealing structure for a sheet passage opening in a dryer according to claim 1, wherein the sealing plate is bent toward the inside of the machine at the longitudinal end. 3. A plurality of sets of sealing tools each composed of a plurality of the sealing plates are housed inside a sealing box, and a circulation path is formed between an exhaust space of the sealing tool and the inside of the sealing box. A circulation fan is provided on the way, an exhaust path is extended from the way of the circulation path, and an inert gas supply path is connected to the seal box.
Or a sealing structure for a sheet passage opening in the dryer.