JP7088783B2 - Coating equipment - Google Patents

Description

The present invention relates to a coating device.

When applying the coating liquid to both sides of a long web, apply the coating liquid to the upper surface of the web with the first die, and then apply the coating liquid to the lower surface of the web with the second die. Apply the working liquid.

Japanese Unexamined Patent Publication No. 2015-9232

When the coating liquid is applied to the lower surface of the web as described above, there is a problem that the web is pulled in the vertical direction by the surface tension of the coating liquid itself and the coated surface is disturbed.

Therefore, in view of the above problems, it is an object of the present invention to provide a coating apparatus in which the web is not easily pulled vertically by the surface tension of the coating liquid itself when the coating liquid is applied to the lower surface of the web. do.

The present invention comprises a starting roll that supports a web traveling in the front-rear direction with a coating liquid coated on the upper surface, and a starting roll that is arranged downstream of the starting roll and below the running path of the web. In a coating device having a die for intermittently coating a coating liquid on the lower surface of the web and a heat treatment device arranged downstream of the die to heat the web, the die has a front split portion and a rear portion. It has a split portion and a shim sandwiched between the front split portion and the rear split portion, and inclined surfaces are formed on the front split portion and the upper part of the rear split portion, respectively, and the front split portion is formed. In the state where the rear split portion is combined, the vertical cross section becomes a triangle, the cutting edge portion protrudes upward in a lip shape from the upper part of the triangle, and a slit-shaped discharge port opens in the left-right direction on the upper surface of the cutting edge portion. A coating stabilizer is arranged in the left-right direction of the inclined surface of the front split portion, and the upper end portion of the coating stabilizer projects upward from the cutting edge portion to support the lower surface of the web . A heat treatment chamber, a carry-in inlet provided on the front surface of the heat treatment chamber, a carry-out outlet provided on the rear surface of the heat treatment chamber, and an upper nozzle for blowing hot air from above to the web traveling in the front-rear direction in the heat treatment chamber. The web traveling in the heat treatment chamber in the front-rear direction has a lower nozzle that blows hot air from below, and the upper nozzle is arranged at a position closest to the carry-in port, and the traveling direction of the web is the same. From the starting roll to the upper nozzle at the position closest to the carry-in entrance, the die is tilted downward with respect to the horizontal direction at an inclination angle θ, and the die is inclined with respect to the vertical direction in accordance with the inclination angle θ. A coating device in which the distance between the lower surface of the web supported by the upper end of the coating stabilizer and the discharge port is maintained in the coating gap .

According to the present invention, the coating liquid can be applied to the lower surface of the web with a desired coating thickness.

It is explanatory drawing of the coating apparatus and the heat treatment apparatus of one Embodiment of this invention. It is an enlarged vertical sectional view of the carry-in entrance part of the undercoating die and the heat treatment apparatus. It is a rear view of the undercoating die. It is a top view of the undercoating die.

Hereinafter, the coating device 10 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 4. The coating device 10 is a double-sided intermittent coating device that intermittently coats both sides of the web W with a coating liquid. The web W is, for example, a metal foil, a film, a cloth, or a paper. Further, a heat treatment device 70 for heating the web W coated on both sides by the coating device 10 is provided to form one manufacturing system 1.

(1) Manufacturing system 1
The coating device 10 and the heat treatment device 70 of the manufacturing system 1 will be described with reference to FIG. The coating device 10 intermittently coats the backup roll 16 and the guide roll 26 that convey the web W, the topcoating die 12 that intermittently coats the coating liquid on the upper surface of the web W, and the coating liquid intermittently on the lower surface of the web W. It has an undercoating die 14.

The backup roll 16 holds the web W by rotating and conveys the web W from the bottom to the top at a constant traveling speed.

The topcoat die 12 is horizontally arranged on the side of the backup roll 16. The topcoating die 12 is composed of an upper division portion 18 and a lower division portion 20, and a liquid reservoir portion 22 is provided on the upper surface of the lower division portion 20 in the left-right direction. A liquid passage 24 is formed from the liquid reservoir 22 toward the backup roll 16, and the coating liquid is intermittently applied to one side (upper surface) of the web W from the discharge port at the tip thereof to form the coating section 2. The non-painted sections 3 are alternately formed. The first pump 28 is connected to the top coating die 12 via the first three-way valve 33, and when the coating section 2 is formed on the upper surface of the web W, the first pump 28 stores the coating liquid. When the coating liquid is pumped from the first tank 30 to the liquid reservoir 22 of the topcoating die 12 via the first three-way valve 33 to form the non-coating section 3 on the upper surface of the web W, the first three-way valve is formed. The valve 33 is switched to stop the coating liquid on the topcoating die 12, and the coating liquid from the first pump 28 is circulated to the first tank 30.

The guide roll 26 rotates and moves the web W having the coating section 2 formed on the upper surface from the vertical direction to the horizontal direction.

The undercoat die 14 is arranged downstream of the guide roll 26. The undercoating die 14 intermittently coats the lower surface of the web W with a coating liquid to alternately form the coated section 4 and the non-coated section 5. A second pump 32 is connected to the undercoating die 14 via a second three-way valve 35, and when the coating section 4 is formed on the lower surface of the web W, the second pump 32 stores the coating liquid. When the coating liquid is pumped from the second tank 34 to the undercoating die 14 via the second three-way valve 35 to form the non-coating section 5 on the lower surface of the web W, the second three-way valve 35 is switched. , The coating liquid on the undercoating die 14 is stopped, and the coating liquid from the second pump 32 is circulated in the second tank 34. The undercoat die 14 will be described in detail later.

In the heat treatment apparatus 70, a web W having a coated section 2 and a non-coated section 3 on the upper surface and an intermittently coated web W having a coated section 4 and a non-coated section 5 on the lower surface is carried in, heat-treated, and carried out. .. The heat treatment apparatus 70 will also be described in detail later.

(2) Undercoating die 14
Next, the undercoating die 14 will be described with reference to FIGS. 2 and 3. As shown in FIG. 2, the undercoating die 14 has a front split portion 36 and a rear split portion 38, and a shim 40 is sandwiched between them.

A front inclined surface 37 is formed on the upper part of the front divided portion 36, a rear inclined surface 39 is formed on the upper part of the rear divided portion 38, and when the front divided portion 36 and the rear divided portion 38 are combined, the vertical cross section becomes a triangle. The cutting edge portion 48 projects upward from the upper part of the triangle like a lip. The upper surface of the cutting edge portion 48 is a flat surface, and a slit-shaped discharge port 50 is opened in the left-right direction.

A liquid reservoir 42 recessed in the left-right direction is formed on the front surface of the rear split portion 38, and the front split portion 36 and the rear split portion 38 sandwich the shim 40 upward from the upper end portion of the liquid reservoir portion 42. A liquid passage 44 is formed toward the liquid passage 44. The discharge port 50 is open at the upper end of the liquid passage 44.

As shown in FIG. 3, the shim 40 is a U-shaped metal plate sandwiched between the front split portion 36 and the rear split portion 38, and is a liquid reservoir in the space between both side portions 40a and 40b of the shim 40. There is a section 22 and a liquid passage 24.

A liquid supply port 46 is formed on the rear surface of the liquid reservoir 42, and the coating liquid is supplied from the above-mentioned second pump 32 via the second three-way valve 35.

A pair of left and right plate support portions 64 are provided on both left and right side portions of the front inclined surface 37 of the front split portion 36. A coating stabilizer 66 is slidably supported along the front inclined surface 37 between the pair of left and right plate support portions 64. The upper end portion of the coating stabilizer 66, that is, the upper end portion 68 of the thick portion of the coating stabilizer 66 in FIG. 2, protrudes upward from the upper surface of the cutting edge portion 48. Then, by sliding the coating stabilizer 66 with respect to the plate support portion 64, the lower surface of the web W on which the upper end portion 68 travels is supported, and the coating gap between the web W and the discharge port 50 at the cutting edge portion 48. To hold.

As shown in FIG. 3, a pair of left and right rotating shafts 52 project from both side surfaces of the undercoating die 14. The pair of left and right rotating shafts 52 are rotatably supported by a pair of left and right arm portions 56 protruding from the base 54. As a result, the undercoating die 14 rotates about the rotation axes 52 and 52 in the left-right direction. Further, as shown in FIG. 3, the base 54 can be moved up and down freely by the vertical movement device 62, and the gap between the cutting edge portion 48 and the web W can be adjusted by the vertical movement device 62. A cotter or the like is used as the vertical movement device 62.

As shown in FIG. 2, a starting point roll 58 is rotatably provided along the width direction (left-right direction) of the web W, which is downstream of the guide roll 26 and upstream of the undercoating die 14.

A sensor 60 for measuring a distance is provided downstream of the undercoating die 14 and in front of the heat treatment apparatus 70. The sensor 60 faces downward and is arranged on the upper surface of the travel path of the web W to measure the vertical distance H to the web W. Further, the position where the sensor 60 is provided is set at the same height as the upper end of the starting roll 58, that is, at a horizontal position, and the lateral distance between the upper end of the starting roll 58 and the sensor 60 is set to L. There is.

(3) Heat treatment device 70
The heat treatment apparatus 70 will be described with reference to FIGS. 1 and 2.

The heat treatment apparatus 70 has a heat treatment chamber 72 having a rectangular parallelepiped heat insulating property.

The carry-in inlet 74 is open on the front surface of the heat treatment chamber 72, and the carry-out port 76 is open on the rear surface. The space from the carry-in entrance 74 to the carry-out port 76 is the travel path of the web W.

An upper duct 78 is provided in the front-rear direction above the traveling path of the heat treatment chamber 72, and upper nozzles 80 are provided at predetermined intervals along the front-rear direction on the lower surface of the upper duct 78. The upper nozzle 80 is long along the width direction of the web W, and the upper outlet 82 for blowing hot air is opened in a slit shape on the lower surface.

A lower duct 84 is provided in the front-rear direction below the traveling path of the heat treatment chamber 72, and lower nozzles 86 are provided at predetermined intervals along the front-rear direction on the upper surface of the lower duct 84. The lower nozzle 86 is long along the width direction of the web W, and a lower outlet 88 for blowing hot air is opened in a slit shape on the upper surface. The upper nozzle 80 and the lower nozzle 86 are arranged in a staggered manner along the front-rear direction. Further, the upper nozzle 80 is arranged instead of the lower nozzle 86 at the position closest to the carry-in inlet 74.

A fan 90 is provided in the heat treatment chamber 72, and the air blown by the fan 90 is heated by a heating device such as an electric heater and a heat exchange unit (not shown), and the common duct 92 is connected to the upper duct 78 and the lower duct 84, respectively. The hot air that is sent separately and passes through the upper duct 78 is blown from the upper nozzle 80 to the upper surface of the web W, and the hot air that has passed through the lower duct 84 is blown from the lower nozzle 86 to the lower surface of the web W.

Since the upper nozzle 80 and the lower nozzle 86 are arranged in a staggered manner along the front-rear direction, the web W is in a floating state as shown in FIG. 2 by the hot air blown from the upper nozzle 80 and the lower nozzle 86. It is transported while being heat-treated while swaying in a sine curve.

(4) Setting the Tilt Angle of the Undercoat Die 14 Next, the setting of the tilt angle θ ° of the undercoat die 14 will be described with reference to FIGS. 1 to 3. Here, the “inclination angle θ °” is an angle at which the undercoating die 14 can apply the coating liquid to the lower surface of the web W with the highest accuracy. As shown in FIG. 2, the undercoating die 14 rotates about the rotation shaft 52 about the center O. Normally, the discharge port 50 on the upper surface of the cutting edge portion 48 is horizontal, and is lowered from the position of the front end portion of the upper end portion of the rear split portion 38, that is, the position of the rear end portion of the discharge port 50 to the center O of the rotation shaft 52. M coincides with the perpendicular line S passing through the center O of the rotation axis 52, and the inclination angle θ = 0 °. At this time, the liquid passage 24 is vertically located along this line M. However, in this vertical state of the undercoating die 14, the coating liquid cannot be accurately applied to the lower surface of the web W which is inclined downward. Therefore, in the present embodiment, the undercoating die 14 is rotated and tilted so that the upper surface of the cutting edge portion 48 is set to be parallel to the lower surface of the web W running on the tilted surface. The test coating for making the settings for that purpose will be described in order.

First, the heat treatment apparatus 70 is operated to blow out hot air.

Next, with respect to the undercoating die 14, the upper surface of the cutting edge portion 48 is tilted from the horizontal with respect to the center O of the rotating shaft 52 so that the tilt angle for test coating is θ0 (for example, θ0 = 2 °), and the top and bottom are raised and lowered. The height of the undercoating die 14 is adjusted by the moving device 62, and the distance from the web W is adjusted to the coating thickness.

Next, the coating section 2 is experimentally formed on the upper surface of the traveling web W with the topcoating die 12.

Next, the web W on which the coating section 2 is formed reaches the starting point roll 58 via the guide roll 26. Since the coating liquid is not applied to the lower surface up to this position, the web W can be maintained in a horizontal state.

Next, when the web W passes through the starting point roll 58, there is nothing to support the web W, so that the web W travels inclined downward due to the weight of the coating section 2 coated on the upper surface of the web W. In particular, this inclination is also affected by the downward blowout from the upper nozzle 80 located downstream.

Next, the undercoating die 14 forms the coating section 4 on the lower surface of the web W. At this time, the web W is subjected to the weight of the coating section 2 on the upper surface, the weight of the coating section 4 coated on the lower surface, and the hot air from the upper nozzle 80 closest to the carry-in port 74 in the horizontal direction. It is tilted downward by the tilt angle θ °.

Next, the inclination angle θ is calculated from the lateral distance L from the upper end of the starting point roll 58 to the sensor 60 and the vertical distance H to the web W measured by the sensor 60. This calculation method is

tan θ = H / L ・ ・ ・ (1)

Because it is

θ = arctan (L / H) ・ ・ ・ (2)

Will be. However, the inclination angle θ ° should be within 0.5 ° to 5 °.

Next, the undercoating die 14 is rotated so that the inclination angle is θ °, tilted by θ ° with respect to the perpendicular line S, and the upper surface of the cutting edge portion 48 is set to be parallel to the lower surface of the web W.

Next, the vertical movement device 62 finely adjusts the height adjustment of the undercoating die 14 so that the coating thickness becomes a predetermined value.

(5) Operating state of the manufacturing system 1 The operating state of the manufacturing system 1 will be described.

First, after setting the inclination angle θ of the undercoating die 14 as described above, the coating stabilizer 66 is slid, and the distance between the web W supported by the upper end portion 68 and the discharge port 50 at the cutting edge portion 48 is applied. Set so that there is a work gap.

Next, the coated section 2 and the non-coated section 3 are alternately formed on the upper surface of the web W traveling by the top coating die 12.

Next, the web W in which the coated section 2 and the non-coated section 3 are alternately formed reaches the starting point roll 58 via the guide roll 26. Since the coating liquid is not applied to the lower surface up to this position, the web W can be maintained in a horizontal state.

Next, when the web W passes through the starting point roll 58, there is nothing to support the web W, so that the web W is inclined downward by θ ° due to the weight of the coating section 2 coated on the upper surface of the web W. In particular, this inclination is also affected by the downward blowout from the upper nozzle 80 located downstream.

Next, since the upper surface of the cutting edge portion 48 of the undercoating die 14 is inclined by θ ° with respect to the horizontal direction, it matches the inclination angle θ ° of the web W, and the upper surface of the cutting edge portion 48 and the lower surface of the web W are aligned with each other. Since the coating liquid is intermittently applied in the parallel state, the coating liquid can be accurately applied to the lower surface of the web W with a predetermined coating thickness. In particular, when the coated section 4 is formed on the lower surface of the web W and the transition to the non-coated section 5, the web W is conventionally pulled vertically by the surface tension of the coating liquid itself. In the form, since the lower surface of the web W is supported by the upper end portion 68 of the coating stabilizer 66, the web W can maintain a constant coating gap without being pulled by its surface tension, and is not coated with the coating section 4. The transition of the construction section 5 is performed neatly, and the coated surface is not disturbed.

Next, the web W whose upper and lower surfaces are intermittently coated is heated in a floating state by hot air from the upper nozzle 80 and the lower nozzle 86 when passing through the heat treatment chamber 72 of the heat treatment apparatus 70, and is carried out from the carry-out port 76. Nozzle.

(6) Effect According to the present embodiment, when the coating section 4 is formed on the lower surface of the web W and then the non-coating section 5 is formed, the coating liquid is not discharged from the discharge port 50. As a result, the lower surface of the web W is pulled vertically by the surface tension of the coating liquid, but the lower surface of the web W is supported by the upper end portion 68 of the coating stabilizer 66, so that the lower surface of the web W is pulled by the surface tension. There is no such thing, and you can make a clean transition.

Further, since the undercoating die 14 is inclined according to the inclination angle θ ° of the web W, the accuracy of the coating thickness is improved when the coating liquid is applied to the lower surface of the web W.

Further, since the downward inclination angle θ ° of the web W is obtained from the lateral distance L between the upper end of the starting point roll 58 and the sensor 60 and the vertical distance H to the upper surface of the web W measured by the sensor 60, it is accurate. The angle can be calculated.

(7) Modification example In the above embodiment, the topcoating die 12 is arranged on the side of the backup roll 16 and the coating liquid is applied to the upper surface of the web W, but the coating liquid is applied to the upper surface of the web W by any other method. The working liquid may be applied.

Further, in the above embodiment, the undercoating die 14 is arranged so as to be inclined with respect to the horizontal plane, but the present invention is not limited to this, and the undercoating die 14 may be arranged vertically.

Further, in the above embodiment, the intermittent coating is described, but the present invention is not limited to this, and even when the coating liquid is continuously applied to the lower surface of the web W, the coating liquid can be provided by providing the coating stabilizer 66. The force of pulling in the vertical direction due to the surface tension of the surface is eliminated, and the coated surface can be coated neatly.

Further, in the above embodiment, the coating liquid is applied to the upper and lower surfaces of the web W, but the coating device 10 may be used to apply the coating liquid only to the lower surface of the web W.

Further, in the above embodiment, the roll is used as the starting point member, but instead of this, a rod arranged in the left-right direction may be used.

Further, in the above embodiment, the liquid reservoir 42 recessed in the left-right direction is provided on the front surface of the rear split portion 38, but instead, the liquid reservoir 42 recessed in the left-right direction is provided on the front surface of the front split portion 36. You may.

Although one embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

2 ... Top surface coated section, 3 ... Top surface non-coated section, 4 ... Bottom surface coated section, 5 ... Bottom surface non-coated section, 10 ... Top surface non-coated section, 10 ... 12 ... Topcoat die, 14 ... Undercoat die, 16 ... Backup roll, 36 ... Front split, 37 ... Front inclined surface, 38 ... Rear split, 39 ...・ Rear inclined surface, 48: cutting edge, 50: discharge port, 64: plate support, 66: coating stabilizer, 68: upper end of coating stabilizer

Claims (4)

A starting point roll that supports the web running in the front-back direction with the coating liquid coated on the upper surface, and
A die that is arranged downstream of the starting roll and below the running path of the web and intermittently coats the lower surface of the web with a coating liquid.
A heat treatment device arranged downstream of the die and heat-treating the web,
In the coating equipment with
The die is
It has a front split portion, a rear split portion, and a shim sandwiched between the front split portion and the rear split portion.
Inclined surfaces are formed on the front division portion and the upper portion of the rear division portion, respectively, and the vertical cross section becomes a triangle in a state where the front division portion and the rear division portion are combined, and the cutting edge is shaped like a lip from the upper part of the triangle. The portion protrudes upward, and a slit-shaped discharge port opens in the left-right direction on the upper surface of the cutting edge portion.
Coating stabilizers are arranged in the left-right direction of the inclined surface of the front split portion.
The upper end portion of the coating stabilizer protrudes upward from the cutting edge portion to support the lower surface of the web.
The heat treatment device is
A heat treatment chamber, a carry-in inlet provided on the front surface of the heat treatment chamber, a carry-out outlet provided on the rear surface of the heat treatment chamber, and an upper nozzle for blowing hot air from above to the web traveling in the front-rear direction in the heat treatment chamber. The web, which travels in the front-rear direction in the heat treatment chamber, has a lower nozzle that blows hot air from below.
The upper nozzle is arranged at the position closest to the carry-in entrance.
The traveling direction of the web is inclined downward with respect to the horizontal direction at an inclination angle θ from the starting point roll to the upper nozzle at a position closest to the carry-in entrance.
The distance between the lower surface of the web and the discharge port supported by the upper end of the coating stabilizer while the die is tilted in the vertical direction according to the inclination angle θ is maintained in the coating gap. Has been,
Coating equipment. A pair of left and right plate support portions are provided on the left and right sides of the inclined surface of the front split portion.
The coating stabilizer is supported between the pair of left and right plate support portions.
The coating device according to claim 1. The coating stabilizer supported between the pair of left and right plate support portions is slidable along the inclined surface of the front split portion.
The coating device according to claim 2 . The die is
A liquid reservoir formed on the vertical surface of the front split portion or the rear split portion,
A liquid passage extending upward from the liquid reservoir between the front split portion and the rear split portion.
Have,
The discharge port is formed at the upper end of the liquid passage.
The coating device according to claim 1.

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