JP2020028842A - Coating device - Google Patents

Abstract

To provide a coating device which makes it difficult for a web to be pulled vertically due to a surface tension of a coating liquid itself when coating an underside of the web with the coating liquid.SOLUTION: A primer coating die 14 has a front division part 36 and a rear division part 38, inclined faces 37, 39 are formed at upper parts of the front division part 36 and the rear division part 38 respectively, and a coating stabilizer 66 is provided in a horizontal direction of the front inclined face 37 of the front division part 36. An upper end part of the coating stabilizer 66 projects above a blade tip 48, and supports an underside of a web W.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a coating device.

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

JP 2015-9232 A

  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 coating surface is disturbed.

  Therefore, the present invention has been made in view of the above problems, and has an object to provide a coating apparatus in which, when a coating liquid is coated on a lower surface of a web, the web is difficult to be pulled vertically by the surface tension of the coating liquid itself. I do.

  According to the present invention, a die for applying a coating liquid to a lower surface of a web traveling in the front-rear direction is arranged below a traveling path of the web, and the die has a front division part, a rear division part, and the front division part. A split portion and a shim sandwiched between the rear split portions, and an inclined surface is formed on each of the front split portion and the rear split portion to form the front split portion and the rear split portion. The longitudinal section becomes triangular in the combined state, the blade 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 and right direction on the upper surface of the blade edge portion, and the front divided portion has A coating apparatus in which a coating stabilizer is disposed in the left-right direction of the inclined surface, and an upper end of the coating stabilizer protrudes above the cutting edge and supports a lower surface of the web.

  ADVANTAGE OF THE INVENTION According to this invention, a coating liquid can be apply | coated with the target application thickness on the lower surface of a web.

It is an explanatory view of a coating device and a heat treatment device of one embodiment of the present invention. It is an expanded longitudinal cross-sectional view of the undercoating die and the entrance of the heat treatment apparatus. It is a rear view of a undercoating die. It is a top view of a undercoating die.

  Hereinafter, a coating apparatus 10 according to an embodiment of the present invention will be described with reference to FIGS. The coating device 10 is a double-sided intermittent coating device for intermittently applying a coating liquid to both surfaces of the web W. Examples of the web W include a metal foil, a film, a cloth, and 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 apparatus 10 includes a backup roll 16 that conveys the web W, a guide roll 26, a top coating die 12 that intermittently applies a coating liquid on the upper surface of the web W, and an intermittent coating liquid on the lower surface of the web W. And an undercoating die 14.

  The backup roll 16 carries the web W at a constant traveling speed while holding the web W by rotating.

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

  The guide roll 26 turns 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 the coating liquid, and forms the coating sections 4 and the non-coating sections 5 alternately. A second pump 32 is connected to the undercoating die 14 via a second three-way valve 35. 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 pressure-fed 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. Then, the coating liquid to the undercoating die 14 is stopped, and the coating liquid from the second pump 32 is circulated to the second tank 34. The undercoating die 14 will be described later in detail.

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

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

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

  On the front surface of the rear divided portion 38, a liquid reservoir portion 42 that is depressed in the left-right direction is formed. The front divided portion 36 and the rear divided portion 38 sandwich the shim 40 upward from the upper end of the liquid reservoir portion 42. A liquid passage 44 is formed toward the opening. The discharge port 50 opens at the upper end of the liquid passage 44.

  The shim 40 is a U-shaped metal plate sandwiched between the front divided portion 36 and the rear divided portion 38 as shown in FIG. 3, and a liquid reservoir is provided in a space between both side portions 40a and 40b of the shim 40. There is a part 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 second pump 32 through the second three-way valve 35.

  A pair of left and right plate support portions 64 is provided on both left and right sides of the front inclined surface 37 of the front division portion 36. A coating stabilizer 66 is slidably supported along the front inclined surface 37 between the pair of left and right plate supporting portions 64. An upper end portion of the coating stabilizer 66, that is, an upper end portion 68 of the thickness portion of the coating stabilizer 66 in FIG. 2 protrudes above the upper surface of the cutting edge portion 48. By sliding the coating stabilizing plate 66 with respect to the plate supporting portion 64, the upper end portion 68 supports the lower surface of the running web W, and the coating gap between the web W and the discharge port 50 in the cutting edge portion 48. Hold.

  As shown in FIG. 3, a pair of left and right rotation shafts 52 protrude from both side surfaces of the undercoat die 14. The pair of left and right rotation shafts 52 is rotatably supported by a pair of left and right arms 56 projecting from the base 54. As a result, the undercoating die 14 rotates around the left and right rotation shafts 52, 52. The base 54 can be freely moved up and down by an up-down movement device 62 as shown in FIG. 3, and the up-down movement device 62 can adjust the gap between the blade edge portion 48 and the web W. As the vertically moving device 62, a cotter or the like is used.

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

  A sensor 60 for measuring a distance is provided downstream of the undercoating die 14 and in front of the heat treatment device 70. The sensor 60 faces downward, is disposed on the upper surface of the traveling path of the web W, and measures a vertical distance H to the web W. The position where the sensor 60 is provided is the same height as the upper end of the starting roll 58, that is, the horizontal position, and the lateral distance between the upper end of the starting roll 58 and the sensor 60 is set to L. I have.

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

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

  A carry-in port 74 is opened at the front of the heat treatment chamber 72, and a carry-out port 76 is opened at the rear. The space from the carry-in port 74 to the carry-out port 76 is the traveling path of the web W.

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

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

  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 or a heat exchange unit (not shown). The hot air that has been separated and sent through the upper duct 78 is blown out 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 out 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 floated by hot air blown from the upper nozzle 80 and the lower nozzle 86 as shown in FIG. It is conveyed while being heat-treated while swinging in a sine curve.

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

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

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

  Next, a coating section 2 is experimentally formed on the upper surface of the running web W with the top coating 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. Up to this position, the coating liquid is not applied to the lower surface, so that the web W can be maintained in a horizontal state.

  Next, when the web W passes through the starting roll 58, there is nothing to support the web W, so that the web W runs with the weight of the coating section 2 applied to the upper surface of the web W inclined downward. In particular, this inclination has an effect of downward blowing from the upper nozzle 80 located downstream.

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

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

tan θ = H / L (1)

Because

θ = arctan (L / H) (2)

Becomes However, the inclination angle θ ° is set to 0.5 ° to 5 °.

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

  Next, fine adjustment of the height adjustment of the undercoating die 14 is performed by the vertical movement device 62 so that a predetermined coating thickness is obtained.

(5) Operating State of 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 stabilizing plate 66 is slid, and the distance between the web W supported by the upper end 68 and the discharge port 50 in the cutting edge 48 is determined. It is set so as to be a gap.

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

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

  Next, when the web W passes through the starting roll 58, there is nothing to support the web W, so that the web W travels inclined downward by θ ° with the weight of the coating section 2 applied on the upper surface of the web W. In particular, this inclination has an effect of downward blowing 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 The coating liquid is intermittently coated in this state, so that the coating liquid can be accurately applied to the lower surface of the web W with a predetermined coating thickness. In particular, when the coating section 4 is formed on the lower surface of the web W and the coating section 4 is shifted to the non-coating section 5, the web W is conventionally pulled vertically by the surface tension of the coating liquid itself. In the embodiment, 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 be maintained at a constant coating gap without being pulled by its surface tension, and the coating section 4 is not coated with the coating section 4. The transition of the construction section 5 is performed neatly, and the coating surface is not disturbed.

  Next, the web W having the upper and lower surfaces 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. You.

(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. However, since the lower surface of the web W is supported by the upper end 68 of the coating stabilizer 66, the lower surface of the web W is pulled by the surface tension. There is no necessity, and it is possible to make a clean transition.

  Further, since the undercoating die 14 is inclined in accordance with 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.

  The downward inclination angle θ ° of the web W is determined from the lateral distance L between the upper end of the starting roll 58 and the sensor 60 and the vertical distance H from the upper surface of the web W measured by the sensor 60. The angle can be determined.

(7) Modification In the above embodiment, the top coating die 12 is arranged on the side of the backup roll 16 and the coating liquid is coated on the upper surface of the web W. However, the coating liquid is coated on the upper surface of the web W by any other method. A working liquid may be applied.

  In the above embodiment, the undercoating die 14 is arranged to be inclined with respect to the horizontal plane. However, the present invention is not limited to this, and the undercoating die 14 may be arranged vertically.

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

  In the above-described embodiment, the coating liquid is applied to the upper and lower surfaces of the web W. However, the coating apparatus 10 that applies the coating liquid only to the lower surface of the web W may be used.

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

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

  Although an embodiment of the present invention has been described above, this embodiment has been presented by way of example only, and is not intended to limit the scope of the invention. These new embodiments can be implemented in other various forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and their equivalents.

2 ... Coating section of upper surface, 3 ... Non-coating section of upper surface, 4 ... Coating section of lower surface, 5 ... Non-coating section of lower surface, 10 ... Coating device, 12: Top coating die, 14: Under coating die, 16: Backup roll, 36: Front division, 37: Front inclined surface, 38: Rear division, 39 ...・ Rear inclined surface, 48 ・ ・ ・ Cutting edge, 50 ・ ・ ・ Discharge port, 64 ・ ・ ・ Plate support, 66 ・ ・ ・ Coating stabilizer, 68 ・ ・ ・ Top end of coating stabilizer

Claims (8)

A die for applying a coating liquid on the lower surface of the web traveling in the front-rear direction is arranged below a travel path of the web,
The die has a front division, a rear division, and a shim sandwiched between the front division and the rear division.
An inclined surface is respectively formed on the upper part of the front division part and the rear division part, and the longitudinal section becomes a triangle in a state where the front division part and the rear division part are combined, and the cutting edge is formed in a lip shape from the upper part of the triangle. Part protrudes upward, a slit-shaped discharge port is opened in the left and right direction on the upper surface of the blade edge,
A coating stabilizer is disposed in the left-right direction of the inclined surface of the front division,
The upper end of the coating stabilizer protrudes above the cutting edge to support the lower surface of the web,
Coating equipment. The distance between the lower surface of the web supported by the upper end of the coating stabilizer and the discharge port is held in a coating gap,
The coating device according to claim 1. A pair of left and right plate support portions is provided on both left and right sides of the inclined surface of the front division portion,
The coating stabilizer is supported between a pair of left and right plate supporting portions,
The coating device according to claim 1. The coating stabilizer supported between the pair of left and right plate supporting portions is slidable along the inclined surface of the front split portion,
The coating device according to claim 3. The traveling path is inclined downward with respect to the horizontal direction,
The die is inclined with respect to the vertical direction according to the inclination angle between the traveling path and the horizontal direction.
The coating device according to claim 1. The die is provided in a vertical direction,
The coating device according to claim 1. The die is
The front division, or a liquid reservoir formed on a vertical surface of the rear division,
A liquid passage extending between the front division and the rear division, and extending upward from the liquid reservoir;
Has,
The discharge port is formed at an upper end of the liquid passage,
The coating device according to claim 1. A coating liquid is applied to the upper surface of the web,
The coating device according to claim 1.

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