JP2002301415A - Web drying apparatus and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a web drying apparatus capable of transporting a web by rollers even if the inclination angle of the tangent decreased, that is, the wrap angle is decreased and to provide a web drying method. SOLUTION: In a drying furnace 61 of a web drying apparatus 60, the angle formed between a contact line contacting one installed pass roller 66M and a pass roller 66U disposed in the upstream side of the pass roller 66M and a contact line contacting the pass roller 66M and a pass roller 66L disposed in the downstream side of the pass roller 66M is limited in a range from 0 deg. to 1 deg.. Consequently, the transportation route formed in the drying furnace 61 can be kept horizontal or approximately horizontal, so that the drying furnace 61 can be constituted horizontally and compactly does no conflict with the restriction on building height. Accordingly, the building height of the web drying furnace 61 can be significantly lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a web drying apparatus and a web drying method capable of drying a web while satisfactorily conveying the web.

[0002]

2. Description of the Related Art In a PS plate production line, a liquid is applied on the upper surface side of a web, and is conveyed into a drying furnace to be dried. In this drying furnace, a zone is generally formed in which the web is dried by blowing dry air from above on the web while conveying and supporting the lower surface of the web with a pass roller (web handling).

[0003] In this case, in order to prevent the web from being scratched due to rotation failure of the pass roller, an arch drying system in which the web wrap angle is increased is conventionally used. In the case of the PS plate, an angle formed between a tangent line contacting one pass roller and a pass roller adjacent to the upstream side of the pass roller, and a tangent line contacting the one pass roller and a pass roller adjacent to the downstream side of the pass roller. It is a general design that (hereinafter, this angle is referred to as a tangent inclination angle) is 2 ° and the installation span of the roller is within 2 m.

[0004] If the tangent inclination angle is made smaller than this,
The web wrap angle of the pass roller is too small, and the grip force of the pass roller on the web is too small. For this reason, the pass roller slips with respect to the web during conveyance, and the lower surface of the web is easily scratched.

[0005] Under the above conditions, if a long drying zone (for example, a drying zone having a zone length exceeding 30 m) is to be formed in a drying furnace, as shown in FIG.
There is a problem that the height of the drying furnace 100 is significantly increased, and therefore, the height H1 of the building 106 must be significantly increased. Therefore, there has been a demand for making the tangent inclination angle as close to 0 ° as possible. It was strongly issued.

There is also a measure to lengthen the roller installation span in order to suppress the height of the building. However, if the span is widened, the suspension of the web due to its own weight increases, and the curl generated in the width direction of the web cannot be suppressed. There is a concern that unevenness may occur, so it cannot be adopted. For this reason, even if an attempt is made to increase the length of the existing drying zone, these are serious restrictions and cannot be increased.

[0007] Such a problem occurs not only in a web for producing a PS plate but also in a general web.

[0008]

SUMMARY OF THE INVENTION In consideration of the above facts, the present invention does not require equipment (e.g., a suction roller, etc.) requiring a large space and a high cost, and can reduce the tangential inclination angle. In other words, it is an object of the present invention to provide a web drying apparatus and a web drying method that can satisfactorily convey a web by rollers even when the wrap angle is reduced.

[0009]

According to the first aspect of the present invention, there is provided a web drying apparatus for drying a web while supporting and transporting the web with a pass roller provided in a drying furnace, wherein the web roller includes one pass roller and the web roller. An angle between a tangent line in contact with the pass roller provided on the upstream side of the one pass roller and a tangent line in contact with the pass roller provided on the downstream side of the one pass roller is 0 ° to 1 °. A low-inclination angle conveying path within the range is formed in the drying oven.

[0010] Even if the above-described low-inclination angle conveyance path is formed in the drying oven, the amount of suspension of the web increases due to the weight of the web, and the gripping force of the disposed pass rollers on the web is ensured. Therefore, since the pass roller does not idle with respect to the web, the web is not damaged by the pass roller during conveyance.

[0011] Thereby, the transport path formed in the drying oven can be made horizontal or nearly horizontal.
A drying zone free from height space constraints can be formed in the drying oven. That is, since a drying furnace constituted by a compact horizontal pass roll line which is not restricted by the height of the building is realized, the height of the web drying apparatus can be significantly reduced.

The present invention can be applied not only to a web for producing a PS plate (often made of aluminum) but also to other plate materials that can utilize the weight of the web.

[0013] The invention according to claim 2 is characterized in that a blowing means for blowing air from above toward the web is provided in the drying furnace.

[0014] Thus, the wind pressure generated by the blowing of air ensures a sufficient gripping force of the pass roller on the web.

According to the third aspect of the present invention, the spraying means has a pitch of 100 to 200 m in the web transport direction.
m, the nozzle is disposed within a range of 2 to 12 mm in the web transport direction.

Thus, when the web is conveyed on the low inclination angle conveyance path, it is easy to sufficiently secure the gripping force of the pass roller on the web.

According to the fourth aspect of the present invention, when the interval between the adjacent pass rollers is in the range of 2500 to 3000 mm, the diameter of the roller surface of the pass rollers is in the range of 140 to 160 mmφ, the inertia moment (GD ² ) of the pass rollers is small. 0.7
It is not more than 5 kgfm ² .

The moment of inertia (GD ² ) is 0.75 kg
In order to reduce the frequency to fm ² or less, the weight of the pass roller may be reduced.

According to the fourth aspect of the present invention, there is provided a drying apparatus in which the roller span of the drying zone formed in the drying furnace is sufficiently widened without any problem.

According to the fifth aspect of the present invention, the diameter of the rotary shaft of the pass roller is set within a range of 12 to 15 mmφ, and
The bearing for receiving the shaft of the pass roller is an oil bath bearing.

As a result, the diameter of the rotating shaft is sufficiently small,
Also, since this rotating shaft is supported by oil bath bearings,
The frictional resistance applied to the rotating shaft when the pass roller rotates can be sufficiently reduced.

It should be noted that setting the diameter of the rotating shaft within the range of 12 to 15 mmφ often results in the minimum allowable diameter from the viewpoint of allowable shaft strength.

In the invention according to claim 6, a tangential line contacting one of the pass rollers and a pass roller provided on the upstream side of the one pass roller, and a tangential line provided on the downstream side of the one pass roller and the one pass roller. A tangent line in contact with the pass roller, using a drying furnace at an angle formed in the range of 0 ° ~ 1 °, air is blown from above onto the web conveyed while being supported by the pass roller, characterized by drying. I do.

Thus, even when the conveying path formed in the drying furnace is nearly horizontal, the gripping force of the pass roller on the web is increased by utilizing the air blown on the web to dry the web. Can be secured.

According to the present invention, the temperature of the air blown from above onto the web is set in the range of 50 to 160 ° C., and the wind speed on the surface to be dried of the web is 4 to 160 ° C.
It is characterized by being within the range of 12 m / s.

Thus, when the web is dried, it is easy to suppress the occurrence of curling at the end in the width direction of the web.

According to an eighth aspect of the present invention, the web is transported by applying a tension in a range of 50 to 200 kgf.

Thus, a sufficient grip force can be given to the pass roller.

According to the ninth aspect of the present invention, the thickness of the web is set within a range of 0.1 to 0.5 mm and the width is set at 1,500.
mm or less, and the tension applied to the web is determined according to the thickness of the web.

[0030] This prevents the web from being pressed more than necessary against the pass roller.

According to a tenth aspect of the present invention, the running speed of the web is set within a range of 10 to 120 m / min, and the web is continuously run.

As a result, the web can be efficiently and sufficiently dried.

The above-described claims 1 to 10
According to the invention described in (1), even if the tangent inclination angle of the low inclination angle conveyance path is 0 °, rotation failure of the pass roller does not occur.
In a state where a web wrap angle of not less than ° is obtained, it is possible to obtain a rotational torque that overcomes the rotational resistance of the pass roller.

[0034]

Embodiments of the present invention will be described below with reference to embodiments.

[First Embodiment] As shown in FIGS. 1 and 2, a web drying device 12 (hereinafter simply referred to as a drying device 12) according to a first embodiment unwinds a web 22 and applies a coating liquid on the upper surface of the web. This is a drying device provided in the web processing line 14 for applying, drying, and rewinding.

As shown in FIG. 3, the drying device 12 is provided with a drying furnace 20 for drying a web 22 having an upper surface coated with a coating liquid. A transport path 24 for transporting the web 22 is provided in the drying furnace 20, and the transport path 24 is formed by connecting a drying box 25.

In the drying box 25, two pass rollers (conveying rollers) 26 are mounted at predetermined positions, and the upper end positions of the pass rollers 26 are all at the same height position, that is, all the pass rollers 26 The drying boxes 25 are continuously connected so that the inclination angle (tangent inclination angle) of the tangents to be tangent is 0 °.

As shown in FIG. 5, the pass roller 26 is provided with a roller installation span L1 of 2700 mm. Further, as shown in FIG. 4, a pass roller 26 includes an aluminum shell 28 and an SU
S journal shaft 30 (diameter d is 12 mmφ),
Consists of The aluminum shell 28 has a roller surface length of 1
200mm, diameter D is 100mmφ, weight is 25kg, G
D ² is a shell of 0.125 kgfm ² .

As the bearing for supporting the pass roller 26 by supporting the journal shaft 30 made of SUS,
An oil bath bearing having a bearing shaft friction coefficient of 0.01 is used.

An air supply duct connection 36 (see FIGS. 3 and 5) is formed in the most upstream drying box 25U, from which drying air is sent into the drying furnace 20. An exhaust duct connection 38 is formed in the most downstream drying box 25L, from which the drying air sent into the drying furnace 20 is exhausted.

In the drying furnace 20, nozzles 50 for blowing air for drying from above onto the web 22 conveyed on the conveying path 24 are provided at equal intervals. This nozzle 50
Is a two-dimensional nozzle, which has a slit-shaped outlet 52 which is elongated in a direction perpendicular to the transport direction of the web 22.

As shown in FIG. 6, the nozzle 50 has a nozzle pitch P of 100 mm, a slit clearance (width in the transport direction of the web 22) B of 4 mm, and a slit width (a direction orthogonal to the transport direction of the web 22, ie, The length L2 in the direction perpendicular to the paper surface) is 1200 mm, the length L2 of the outlet 52 is 5 mm, the height h1 from the upper surface of the web 22 to the outlet 52 is 35 mm, and the height h2 from the outlet 52 to the upper end of the nozzle is 50 mm.

The temperature of the air blown from the nozzle 50 is 120
° C, and the web 22
Is 12 m / sec.

Note that, as shown in FIG.
In 5U, an openable / closable lid 21 for inspection is provided at a predetermined position.

Web 2 Conveyed by Pass Roller 26
Reference numeral 2 denotes a web made of aluminum and having a thickness of 0.24 mm and a width W (see FIG. 4) of 1200 mm.

In the first embodiment, when the web 22 is conveyed, the tension F applied to the web 22 is 100 kg, and the running speed U is 100 m / min (see FIG. 3). By applying a force of 3.7 kgf to the pass roller 26 in total of its own weight and the dynamic pressure and static pressure of the dry wind, a web grip angle of θ = 1.05 ° (see FIG. 4) can be obtained. At this time, the rotation torque required for the rotation of the pass roller 26 is 0.0059 kgfm for acceleration torque and 0.059 for mechanical loss torque.
019 kgfm, which is 0.0078 kgfm, but with an effective friction coefficient of 0.1 and a rotational torque of 0.0087 kg.
Since fm is obtained, the web 22 can be conveyed without causing roller rotation failure.

Accordingly, the drying furnace 2 whose height is greatly reduced
Thus, the drying device 12 that can convey the web 22 satisfactorily at 0 is realized. In addition, the height of the building 56 (see FIG. 2) surrounding the drying device 12 is greatly reduced as compared with the related art, so that when building the building 56, the restriction on the height of the building is largely eliminated.

[Second Embodiment] Next, a drying apparatus according to a second embodiment will be described. As shown in FIG. 7, a web drying device 60 according to the second embodiment (hereinafter, simply referred to as a drying device 60)
Drying furnace 61 constituting drier 60 compared to the first embodiment
Is formed in a slightly arch shape.
Characters representing physical quantities such as L1 shown below indicate the same kind of physical quantities as in the first embodiment.

In the drying device 60, one pass roller 66M forming the transport path 64 and the pass roller 66M
A tangent line S contacting the path roller 66U adjacent to the upstream side of M
8 (see FIG. 8), the one pass roller 66M and the pass roller 66 adjacent to the downstream side of the pass roller 66M.
The angle (web wrap angle, that is, tangent inclination angle) θ between the tangent S2 tangent to L and the tangent S2 is 1 °.

The pass roller 66 has a roller installation span L1.
Is set within the range of 2,500 to 3,000 mm, and the pass roller 66 is made of an aluminum shell 68.
And a SUS journal shaft 70 (having a diameter d of 12 to 15 mmφ) penetrating the aluminum shell 68. The aluminum shell 68 has a roller surface length of 1650.
It is a shell having a diameter D of 140 to 160 mmφ, a weight of 30 to 60 kg, and a GD ² of 0.75 kgfm ² or less.

As a bearing for supporting the pass roller 66, an oil bath bearing having a bearing shaft friction coefficient of 0.01 or less is used.

As in the first embodiment, the drying furnace 61 is provided with nozzles 78 for blowing drying air from above onto the web 72 conveyed on the conveying path 64 at equal intervals. The nozzle 78 is a two-dimensional nozzle and has a nozzle pitch P of 1
The number of nozzles 78 is also variable depending on the pitch and the length of the roller span. Nozzle 78
Has a slit clearance B of 2 to 12 mm, and the temperature of hot air used for drying is 50 to 160 ° C. The wind speed is
The setting is made by adjusting the damper of the supplied drying air volume and changing the nozzle clearance so as to be 4 to 12 m / sec.

Web 7 conveyed by pass roller 66
2 is made of aluminum and has a thickness of 0.1 to 0.5 mm and a width W
Is a web of a maximum of 1,500 mm.

In the second embodiment, the tension F applied to the web 72 when the web 72 is transported is set to 50 to 200 kg / m according to the thickness of the web 72, and the line speed (running speed of the web 72) U is set. 10-120m / min
And run continuously.

According to the second embodiment, compared to the first embodiment, a web drying apparatus in which the manufacturing conditions are eased and the grip force on the web 72 is easily ensured is realized.

Third Embodiment Next, a third embodiment will be described. As shown in FIG. 9, in the third embodiment, coating heads 86A to 86C for applying a coating liquid are provided at three locations, and drying furnaces 90A to 90C are connected downstream of each coating head.

In the drying furnace 90A connected to the downstream side of the coating head 86A, a tangent line formed by a drying box 90T constituting the uppermost portion of the transport path 94 and drying boxes 90U and 90L connected before and after the drying box 90T. A low inclination angle conveyance path 94X in which the inclination angles (web wrap angles) are all 1 ° is formed.

According to the third embodiment, a plurality of drying ovens 90A to 90C
Even if the web processing line is provided with
By greatly reducing the height H2 of A, the height H1 of the building 96 covering the web processing line can be significantly reduced. In the drying furnace 90A, a low inclination angle conveyance path 94X is formed only in a part of the conveyance path 94, and the height is effectively reduced.

[0059]

According to the present invention, the web can be satisfactorily roller-conveyed even if the tangential inclination angle is reduced, that is, the wrap angle is reduced, without providing equipment that requires a space and a high cost of the apparatus. .

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a web processing line in which a web drying device according to a first embodiment is used.

FIG. 2 is a conceptual side view showing a web processing line in which the web drying apparatus according to the first embodiment is used.

FIG. 3 is a side sectional view of a drying furnace of the web drying device according to the first embodiment.

FIG. 4 is a perspective view of a pass roller included in the web drying device according to the first embodiment.

FIG. 5 is a side sectional view of a drying box constituting the drying furnace.

FIG. 6 is a side sectional view showing a layout of nozzles for blowing air provided in a drying furnace of the web drying device according to the first embodiment.

FIG. 7 is a side sectional view of a drying furnace of a web drying device according to a second embodiment.

FIG. 8 is a perspective view showing a web wrap angle in the second embodiment.

FIG. 9 is a side view showing a web processing line using a web drying device partially having a low-inclination angle conveyance path in a third embodiment.

FIG. 10 is a side view showing a conventional web processing line provided with a web drying device having a tangent inclination angle of 2 ° or more in the conventional web processing line.

[Explanation of symbols]

 12 Web Drying Device 20 Drying Furnace 26 Pass Roller 50 Nozzle 60 Web Drying Device 61 Drying Furnace 66 Pass Roller 78 Nozzle 90 Drying Furnace 94X Low Inclination Angle Transfer Path 100 Drying Furnace

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) F26B 13/12 F26B 13/12 A F term (reference) 3F105 AA08 AB11 BA04 BA09 BA18 CA11 DA03 DA08 DA12 3L113 AA02 AA03 AB01 AC31 BA26 DA17 DA24 4D075 BB24Z BB33Z BB91Z BB93Z DA04 DB07 4F042 AA22 BA01 BA04 BA08 BA10 BA19 DB02 DB25

Claims (10)

[Claims] 1. A web drying apparatus for drying a web while supporting and transporting the web with a pass roller disposed in a drying furnace, comprising: a path roller and a pass roller provided upstream of the one pass roller. The low-slant-angle conveying path in which the angle between the tangent line that contacts and the tangent line that contacts the one pass roller and the pass roller that is provided on the downstream side of the one pass roller is limited to a range of 0 ° to 1 ° is used for the drying. A web drying device formed in a furnace. 2. The web drying apparatus according to claim 1, wherein a spraying means for blowing air from above toward the web is provided in the drying furnace. 3. A nozzle is disposed in the spraying means within a range of 100 to 200 mm in a pitch in a direction in which the web is conveyed.
3. The method according to claim 1, wherein the distance is within a range of 2 mm.
2. The web drying device according to 1. 4. The distance between adjacent pass rollers is 2,500-500.
The path roller has a diameter of 140 to 160 mmφ within a range of 3000 mm, and a moment of inertia (GD ² ) of the path roller is 0.75 kgfm ² or less. The web dryer according to any one of the preceding claims. 5. The diameter of the rotary shaft of the pass roller is 12 to 15 m.
5. An oil bath bearing, wherein the bearing for receiving the shaft of the pass roller is within the range of m.phi.
2. The web drying device according to 1. 6. A tangent line contacting one of the pass rollers and a pass roller provided upstream of the one pass roller, and a tangent line contacting the one pass roller and a pass roller provided downstream of the one pass roller. Angle between 0 ° and
A web drying method in which air is blown from above onto a web conveyed while being supported by the pass rollers, and the web is dried using a drying furnace within a range of 1 °. 7. The temperature of air blown onto the web from above is set in a range of 50 to 160 ° C., and a wind speed on a surface to be dried of the web is set in a range of 4 to 12 m / s. The web drying method according to claim 6, wherein 8. The web drying method according to claim 6, wherein the web is conveyed while applying a tension in a range of 50 to 200 kgf. 9. The thickness of the web is 0.1 to 0.5 mm
The web drying method according to claim 8, wherein the width is set to 1,500 mm or less within the range, and the tension applied to the web is determined according to the thickness of the web. 10. The running speed of the web is 10 to 120.
The web drying method according to claim 9, wherein the web is continuously run while being within a range of m / min.