Coating device

Abstract

To thinly form a coating film at high speed.SOLUTION: A coating device 1 includes an upstream side guide roll 10, a downstream side guide roll 20, a coating die 30 which is provided between the upstream side guide roll 10 and the downstream side guide roll 20 so as to be pressed against a base film 2, and a vacuum box 40 for producing a negative pressure on a surface facing the coating die 30 in the base film 2 guided to the coating die 30 from the upstream guide roll 10, wherein the vacuum box 40 has a side plate 41 which has an end face 41a facing the base film 2 which is not supported by the upstream side guide roll 10 and the downstream side guide roll 20, and is formed along the base film 2 from a position supported by the upstream side guide roll 10 to a position facing the coating die 30, and a box body 42 for sucking air in a space 4 defined by the side plate 41 so that its side face is blocked to outside.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a coating device. [Background technology]

[0002] Patent Document 1 discloses a die coating device (coating device) that applies a coating liquid discharged from the tip of a slit in a slot die head (coating die) to a coating object that travels between an upstream guide roll and a downstream guide roll under a predetermined tension. In this die coating device, a reduced-pressure area is created between the slot die head and the upstream guide roll by blowing air onto the coating object. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-075752 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the die coating device described in Patent Document 1, because air is blown onto the workpiece, it is not possible to reduce the amount of air moving along the surface of the workpiece, and sufficient negative pressure cannot be obtained. As a result, it is difficult to create a negative pressure in the space upstream of the coating die, making it difficult to form a thin coating film at high speed.

[0005] The present invention has been made in view of the above problems, and has as its object to form a thin coating film at high speed. [Means for solving the problem]

[0006] According to one aspect of the present invention, a coating device for applying a coating material to an object to be coated comprises an upstream guide roll that guides the object to be coated downstream; a downstream guide roll that is spaced apart from the upstream guide roll and guides the object to be coated further downstream after being guided from the upstream guide roll; a coating die that is positioned between the upstream guide roll and the downstream guide roll so as to be pressed against the object to be coated and that discharges the coating material from a slit; and a negative pressure generating mechanism that creates a negative pressure on a surface of the object to be coated that faces the coating die as it is guided from the upstream guide roll to the coating die, wherein the negative pressure generating mechanism has an end face that faces the object to be coated that is not supported by the upstream guide roll and the downstream guide roll, and the negative pressure generating mechanism comprises a side plate that is formed along the object to be coated from a position supported by the upstream guide roll to a position facing the coating die; and a suction mechanism that sucks air out of a space defined by side plates that close off the sides of the side plates. [Effects of the Invention]

[0007] In this embodiment, a negative pressure generating mechanism is provided, which includes a side plate having an end surface facing an article to be coated that is not supported by the upstream guide roll and the downstream guide roll, and which is formed along the article to be coated from the position supported by the upstream guide roll to the position facing the coating die, and a suction mechanism that sucks air out of the space defined by the side plate. This makes it possible to create a negative pressure on the surface of the article to be coated that is guided from the upstream guide roll to the coating die and is not supported by the upstream guide roll and the downstream guide roll, facing the coating die. This allows a thin coating film to be formed quickly. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a front view showing the configuration of a coating device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a plan view of FIG. 1, in which the downstream guide roll is omitted. [Figure 3]FIG. 3 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 5 is a diagram showing the relationship between the conveying speed and the minimum coating film thickness. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a coating device 1 according to an embodiment of the present invention will be described with reference to the drawings. Note that in each drawing, the scale of each component has been appropriately changed for the sake of convenience of explanation, and the illustration is not necessarily precise. Furthermore, for multiple identical components, only some of them may be assigned reference numerals, and the reference numerals may be omitted for the rest.

[0010] First, the overall configuration of the coating device 1 will be described with reference to Fig. 1 to Fig. 4. Fig. 1 is a front view showing the configuration of the coating device 1. Fig. 2 is a plan view of Fig. 1, with the downstream guide roll 20 omitted. Fig. 3 is a cross-sectional view taken along III-III in Fig. 1. Fig. 4 is a cross-sectional view taken along IV-IV in Fig. 3.

[0011] As shown in Fig. 1, the coating device 1 is a device that applies a coating liquid 3 as a coating material to a coating surface 2a as one side of a sheet-like base film 2 as a coating target to form a coating film 3a. The coating device 1 is a so-called roll-to-roll type device that applies the coating liquid 3 to the base film 2 that is unwound from a unwinding roll (not shown) and then takes it up on a take-up roll (not shown).

[0012] The payout roll and the take-up roll are each driven to rotate around their central axes by an electric motor (not shown). The central axes of the payout roll and the take-up roll are arranged parallel to each other. The base film 2 paid out from the payout roll is wound up by the take-up roll, and the base film 2 is transported in the longitudinal direction between the payout roll and the take-up roll. The electric motor that rotates the payout roll and the take-up roll is controlled by a controller (not shown) so that the base film 2 is transported at a predetermined speed while applying a predetermined tension to prevent bending.

[0013] In the following description, the coating device 1 will be described assuming that the up-down direction in Fig. 1 is the vertical direction. In the following description, unless otherwise specified, "up" and "down" refer to up and down in the vertical direction, that is, the up-down direction in Fig. 1. In addition, in the following description, the unwinding roll side will be described as "upstream" in the conveying direction, and the winding roll side will be described as "downstream" in the conveying direction.

[0014] As shown in FIG. 1, the coating device 1 includes an upstream guide roll 10, a downstream guide roll 20, a coating die 30, and a vacuum box 40 as a negative pressure generating mechanism.

[0015] The upstream guide roll 10 is provided below the coating die 30. The upstream guide roll 10 rotates in one direction (here, clockwise) to guide the base film 2 from upstream to downstream. The upstream guide roll 10 is fixed so that its position along the horizontal direction (left-right direction in FIG. 1 ), which is the direction in which the coating liquid 3 is discharged by the coating die 30, cannot be adjusted. In other words, the upstream guide roll 10 is fixed so that the distance from the coating die 30 cannot be adjusted.

[0016] The upstream guide roll 10 is set to have a larger wrap angle α [deg] at which the base film 2 abuts than the downstream guide roll 20. Specifically, the wrap angle α [deg] at the upstream guide roll 10 is set to an angle that includes the bottommost portion 10a of the upstream guide roll 10. The wrap angle α [deg] at the upstream guide roll 10 is set to be larger than 90 degrees.

[0017] This increases the embrace angle α [deg] at which the base film 2 contacts the upstream guide roll 10, causing the base film 2 to move upward upstream of the upstream guide roll 10. This makes it possible to set a wide area where the base film 2 faces the end face 41a of a side plate 41 (described later), ensuring space for installing a box body 42 of a vacuum box 40 (described later).

[0018] The downstream guide roll 20 is provided above the coating die 30. The downstream guide roll 20 is provided above the upstream guide roll 10 at a distance from the upstream guide roll 10. The downstream guide roll 20 rotates in one direction (clockwise in this case) so as to guide the base film 2 guided from the upstream guide roll 10 further downstream. The downstream guide roll 20 is fixed so that its position along the horizontal direction cannot be adjusted.

[0019] In this way, the upstream guide roll 10 and the downstream guide roll 20 are arranged vertically at a distance from each other, and the base film 2 is transported vertically from the upstream guide roll 10 to the downstream guide roll 20, from below to above.

[0020] The coating die 30 is provided at a position facing one surface (coating surface 2a) of the base film 2 that does not contact the upstream guide roll 10 and the downstream guide roll 20. The coating die 30 discharges the coating liquid 3 to be supplied to the coating surface 2a of the base film 2, and forms a film of the coating liquid 3 (coating film 3a) on the coating surface 2a of the base film 2, as shown in Figures 1 and 2. The operation of the coating die 30 is controlled by a controller.

[0021] As shown in Fig. 1, the coating die 30 is provided between the upstream guide roll 10 and the downstream guide roll 20. The coating die 30 supplies the coating liquid 3 to the base film 2, which is located at an intermediate position not in contact with (not supported by) either the upstream guide roll 10 or the downstream guide roll 20, by discharging the coating liquid 3 in a horizontal direction (left-right direction in Fig. 1) perpendicular to the base film 2. Specifically, the vertical supply position of the coating liquid 3 by the coating die 30 corresponds to the center between the upstream guide roll 10 and the downstream guide roll 20.

[0022] In this way, the coating device 1 is an apparatus that applies the coating liquid 3 to the base film 2 by off-roll coating, in which the coating liquid 3 is applied to the base film 2 in a state where it is not supported by a guide roll, rather than by on-roll coating, in which the coating liquid 3 is applied to the base film 2 that is supported by a guide roll.

[0023] The coating die 30 is supported by a frame 8 attached to the equipment main body 9. That is, the coating die 30 is supported by the equipment main body 9 via the frame 8. The coating die 30 is configured to be able to advance and retreat horizontally (left and right in FIG. 1 ) relative to the frame 8 toward the base film 2 located at the intermediate position. The coating die 30 is disposed between the upstream guide roll 10 and the downstream guide roll 20 so as to press against the base film 2. The coating die 30 is able to advance and retreat between a retracted position where it is separated from the base film 2 when preparing for coating, etc., and a coating position where it applies the coating liquid 3 to the base film 2. When applying the coating liquid 3 to the base film 2, the coating die 30 is fixed at the coating position (the state shown in FIG. 1 ).

[0024] 1 and 3, the coating die 30 has a die lip 31 as a tip portion facing the base film 2. The die lip 31 has a discharge port 31a, which extends in the discharge direction of the coating die 30 and serves as a slit through which the coating solution 3 is discharged. The die lip 31 has a rounded portion 32 provided downstream of the discharge port 31a in the conveyance direction of the base film 2 (upper side in FIG. 1), and a relief portion 33 provided upstream of the discharge port 31a in the conveyance direction of the base film 2 (lower side in FIG. 1). The rounded portion 32 and the relief portion 33 are provided above and below the discharge port 31a in the vertical direction, sandwiching the discharge port 31a therebetween.

[0025] The rounded portion 32 is formed by a convex curved surface (R-shape). The relief portion 33 is formed by an inclined surface that inclines so as to move away from the base film 2 as it moves away from the discharge port 31a upstream in the transport direction.

[0026] As shown in FIG. 1 , when coating the base film 2 with the coating fluid 3, the coating die 30 comes into contact with the base film 2 via the discharged coating fluid 3. Therefore, the coating die 30 does not generally come into direct contact with the base film 2. However, the possibility of the coating die 30 coming into direct contact with the base film 2 cannot be ruled out due to fluctuations in the discharge pressure from the coating die 30 or the influence of unintended external forces. In contrast, in the coating device 1, even if the die lip 31 comes into contact with the base film 2, the relief portion 33 does not come into contact with the base film 2, and only the rounded portion 32 comes into contact with the base film 2. This prevents scratches and other damage to the base film 2.

[0027] The vacuum box 40 applies negative pressure to the surface (coating surface 2a) of the base film 2 that faces the coating die 30 as it is guided from the upstream guide roll 10 to the coating die 30. This reduces the amount of air moving along the surface of the base film 2, allowing the coating solution 3 that forms the coating film 3a to be sucked upstream in the conveyance direction, making it difficult for the bead of the coating film 3a to break. This allows the coating film 3a to be formed thinner.

[0028] The vacuum box 40 sucks the base film 2 that is not supported by the upstream guide roll 10 and the downstream guide roll 20 toward an end face 41a (described later) of the side plate 41 between the upstream guide roll 10 and the downstream guide roll 20. The vacuum box 40 reduces the distance between the side plate 41 and the base film 2 that is not supported by the upstream guide roll 10 and the downstream guide roll 20.

[0029] This reduces the distance between the end face 41a of the side plate 41 and the base film 2, thereby increasing the absolute value of the negative pressure on the surface of the base film 2 that is not supported by the upstream guide roll 10 and the downstream guide roll 20 and faces the coating die 30.

[0030] The specific configuration of the vacuum box 40 will be described below.

[0031] The vacuum box 40 has a pair of side plates 41, a box body 42 that constitutes a suction mechanism, and a back plate 43. The vacuum box 40 defines a space 4 that is formed by the stand 8, the coating die 30, the pair of side plates 41, the box body 42, the back plate 43, and the base film 2.

[0032] The side plate 41 is formed along the base film 2 from a position supported by the upstream guide roll 10 to a position facing the coating die 30. Specifically, the side plate 41 is formed from a position facing the bottommost portion 10a of the upstream guide roll 10 to a position facing the discharge opening 31a of the coating die 30. The side plate 41 has an end surface 41a, a first fixing portion 41b, a second fixing portion 41c, and a third fixing portion 41d.

[0033] The end surface 41a faces the base film 2 that is not supported by the upstream guide roll 10 and the downstream guide roll 20. The end surface 41a is formed in a shape that matches the shape of the base film 2 located between the upstream guide roll 10 and the coating die 30, so that a small gap is formed between the end surface 41a and the base film 2. Because the position of the upstream guide roll 10 cannot be adjusted and the shape of the base film 2 is determined by the coating position of the coating die 30, the end surface 41a can be formed in advance in a shape that matches the base film 2.

[0034] A gap is formed between the end face 41a and the base film 2, but this gap is so small that the air in the space 4 is sucked out from the box body 42, creating a negative pressure in the space 4 relative to atmospheric pressure. This gap becomes smaller as the base film 2 that is not supported by the upstream guide roll 10 and the downstream guide roll 20 is sucked toward the end face 41a.

[0035] The first fixing portion 41b is a portion attached to the side surface of the frame 8 and the coating die 30. By providing the first fixing portion 41b, the gap between the side plate 41 and the frame 8 and the gap between the side plate 41 and the coating die 30 are closed.

[0036] The second fixing portion 41c is a portion that is attached to the side surface of the back plate 43. By providing the second fixing portion 41c, the gap between the side plate 41 and the back plate 43 is closed.

[0037] The third fixing portion 41d is a portion that is attached to the side surface of the box body 42. By providing the third fixing portion 41d, the gap between the side plate 41 and the box body 42 is closed.

[0038] In this way, by providing the first fixing portion 41b, the second fixing portion 41c, and the third fixing portion 41d, a space 4 can be formed by the stand 8, the coating die 30, the pair of side plates 41, the box body 42, and the back plate 43, and only the surface facing the base film 2 is open.

[0039] 1 and 4, the box body 42 is fixed to the stand 8. The box body 42 sucks air out of the space 4 defined by the side plates 41. The box body 42 has an opening 42a, a first chamber 42b, a second chamber 42c, a partition plate 42d, and a suction port 42e.

[0040] The opening 42a is provided so as to open to the upper surface of the box body 42. The opening 42a connects the upper surface of the first chamber 42b to the upper surface of the second chamber 42c, and connects the first chamber 42b and the second chamber 42c to the space 4.

[0041] The first chamber 42b is formed at a position along the frame 8. The first chamber 42b has an opening 42a at the top. The coating liquid 3 dripping from the coating die 30 enters the first chamber 42b. As a result, even if the coating liquid 3 drips from the coating die 30, it collects in the first chamber 42b and does not affect the function of the vacuum box 40.

[0042] The second chamber 42c is separated from the first chamber 42b by a partition plate 42d and is located farther from the pedestal 8 than the first chamber 42b. The second chamber 42c has an opening 42a at the top. A suction port 42e is provided on the side of the second chamber 42c. Negative pressure is created in the second chamber 42c by sucking air through the suction port 42e. This allows negative pressure to be created in the space 4 communicating with the second chamber 42c.

[0043] The partition plate 42d separates the first chamber 42b from the second chamber 42c. By providing the partition plate 42d, the coating liquid 3 stored in the first chamber 42b does not move to the second chamber 42c. Therefore, when air is sucked out of the second chamber 42c, the coating liquid 3 can be prevented from being sucked out together with the air.

[0044] The suction port 42e is formed on a side surface of the second chamber 42c. The suction port 42e is connected to a blower 5 serving as a suction device that constitutes a suction mechanism together with the box body 42. The suction port 42e is a passage that guides the air inside the second chamber 42c so that it is discharged to the outside when the blower 5 is activated. Note that instead of the blower 5, another device such as a vacuum pump may be provided as the suction device.

[0045] As shown in FIG. 1, the back plate 43 has a first closing portion 43a, a second closing portion 43b, and a third closing portion 43c.

[0046] The first blocking portion 43a is attached to the end surface of the box body 42 where the suction port 42e is formed.

[0047] The second closing portion 43b is provided at a predetermined distance above the box body 42. The second closing portion 43b forms a space between the box body 42 and itself through which air can circulate, and closes the upper side of the box body 42 to define the space 4.

[0048] The third blocking portion 43c stands upright from the second blocking portion 43b so as to face the bottommost portion 10a of the upstream guide roll 10. The third blocking portion 43c faces the bottommost portion 10a of the upstream guide roll 10 without coming into contact with the base film 2, leaving a small gap between it and the base film 2. The standing end of the third blocking portion 43c is formed in a shape that follows the base film 2, the same as the side plate 41 on its side.

[0049] Next, the operation of the coating device 1 will be described with reference to Fig. 5. Fig. 5 is a diagram showing the relationship between the conveying speed V and the minimum coating film thickness T.

[0050] The horizontal axis of Fig. 5 is the conveying speed V [m / min] of the base film 2, and the vertical axis is the minimum coating thickness T [μm] of the coating film 3a. In Fig. 5, the solid line shows the case where the coating device 1 equipped with the vacuum box 40 was used, and the dashed line shows the case where a general coating device not equipped with the vacuum box 40 was used as a comparative example.

[0051] In both the case of using the coating device 1 and the case of using a general coating device according to the comparative example, a 100 μm thick, 100 mm wide PET (Polyethylene Terephthalate) base film 2 was used, and a radical polymerization type acrylic UV-curable resin with a viscosity of 100 mPa·s was used as the coating liquid 3. The coating liquid 3 was applied to form a coating film 3a with a width of 80 mm. When using the coating device 1, the pressure in the space 4 was set to a negative pressure of −0.5 to −1.0 kPa relative to atmospheric pressure using the vacuum box 40, and the tension of the base film 2 at the coating section contacting the coating die 30 was set to 20 to 40 N.

[0052] As shown in Figure 5, when the conveying speed V was between 1 [m / min] and 3 [m / min], the minimum coating thickness T for a general coating device was 2.0 [μm], while the minimum coating thickness T for Coating Device 1 was 1.0 [μm].

[0053] When the conveying speed V was increased to 4 m / min, streaks appeared in the coating film 3a with a typical coating device, but the coating film 3a could be formed by increasing the minimum coating thickness T to 2.5 μm. In contrast, with coating device 1, the minimum coating thickness T was maintained at 1.0 μm even when the conveying speed V was increased to 4 m / min.

[0054] When the conveying speed V was increased to 5 m / min, a typical coating device was required to increase the minimum coating thickness T to 3.0 μm in order to form the coating film 3a. In contrast, with coating device 1, even when the conveying speed V was increased to 5 m / min, the coating film 3a could be formed by increasing the minimum coating thickness T to only 1.5 μm.

[0055] In this way, it was found that when using a coating device 1 equipped with a vacuum box 40, a coating film 3a can be formed with a minimum coating film thickness T that is approximately half that when using a general coating device not equipped with a vacuum box 40, regardless of the conveying speed V.

[0056] Furthermore, both when using the coating device 1 and when using the general coating device according to the comparative example, the minimum coating thickness T of the coating film 3a increases as the conveying speed V of the base film 2 increases. However, when using the coating device 1, the conveying speed V at which the minimum coating thickness T increases is higher, and the rate of increase in the minimum coating thickness T is also smaller.

[0057] As described above, the coating device 1 is provided with a vacuum box 40 having an end face 41a facing the base film 2 that is not supported by the upstream guide roll 10 and the downstream guide roll 20, a side plate 41 formed along the base film 2 from the position supported by the upstream guide roll 10 to the position facing the coating die 30, and a box body 42 that sucks air out of the space 4 defined by the side plate 41.

[0058] This allows a negative pressure to be applied to the surface of the base film 2 that is guided from the upstream guide roll 10 to the coating die 30 and is not supported by the upstream guide roll 10 and the downstream guide roll 20, facing the coating die 30. Therefore, in the coating device 1 that forms the coating film 3a on the base film 2 between the upstream guide roll 10 and the downstream guide roll 20, the coating film 3a can be formed thinly and quickly.

[0059] The effects of this embodiment will be summarized below.

[0060] The coating device 1 for coating the base film 2 with the coating liquid 3 comprises an upstream guide roll 10 for guiding the base film 2 downstream, a downstream guide roll 20 spaced apart from the upstream guide roll 10 and guiding the base film 2 guided from the upstream guide roll 10 further downstream, a coating die 30 disposed between the upstream guide roll 10 and the downstream guide roll 20 so as to press against the base film 2 and eject the coating liquid 3 from an ejection opening 31a, and a base film guided from the upstream guide roll 10 to the coating die 30. and a vacuum box 40 that creates a negative pressure on the surface of the film 2 that faces the coating die 30. The vacuum box 40 has an end face 41a that faces the base film 2 that is not supported by the upstream guide roll 10 and the downstream guide roll 20, and has a side plate 41 formed along the base film 2 from the position supported by the upstream guide roll 10 to the position facing the coating die 30, and a box body 42 that sucks air out of a space 4 defined by the side plates 41.

[0061] According to this configuration, a vacuum box 40 is provided, which has an end face 41a facing the base film 2 that is not supported by the upstream guide roll 10 and the downstream guide roll 20, and a side plate 41 formed along the base film 2 from the position supported by the upstream guide roll 10 to the position facing the coating die 30, and a box body 42 that sucks air out of the space 4 defined by the side plate 41.

[0062] This allows a negative pressure to be applied to the surface of the base film 2 that is guided from the upstream guide roll 10 to the coating die 30 and is not supported by the upstream guide roll 10 and the downstream guide roll 20, facing the coating die 30. Therefore, in the coating device 1 that forms the coating film 3a on the base film 2 between the upstream guide roll 10 and the downstream guide roll 20, the coating film 3a can be formed thinly and quickly.

[0063] In addition, the vacuum box 40 sucks the base film 2 that is not supported by the upstream guide roll 10 and the downstream guide roll 20 toward the end face 41a of the side plate 41 between the upstream guide roll 10 and the downstream guide roll 20.

[0064] The vacuum box 40 reduces the distance between the upstream guide roll 10 and the downstream guide roll 20 and the side plate 41 of the base film 2 that is not supported by the upstream guide roll 10 and the downstream guide roll 20.

[0065] With these configurations, the distance between the end face 41a of the side plate 41 and the base film 2 is reduced, thereby increasing the absolute value of the negative pressure on the surface of the base film 2 that is not supported by the upstream guide roll 10 and the downstream guide roll 20 and that faces the coating die 30.

[0066] The upstream guide roll 10 is set to have a larger wrap angle α [deg] at which the base film 2 contacts than the downstream guide roll 20. The wrap angle α [deg] at the upstream guide roll 10 is set to an angle that includes the bottommost portion 10a of the upstream guide roll 10. The wrap angle α [deg] at the upstream guide roll 10 is set to be larger than 90 degrees.

[0067] With this configuration, the embrace angle α [deg] at which the base film 2 contacts the upstream guide roll 10 is increased, which allows the area facing the end face 41a of the side plate 41 to be set correspondingly wider. Therefore, the surface of the base film 2 upstream of the coating die 30 that faces the coating die 30 can be under negative pressure.

[0068] Furthermore, the upstream guide roll 10 is fixed so that the distance to the coating die 30 cannot be adjusted.

[0069] According to this configuration, by fixing the upstream guide roll 10 so that the distance to the coating die 30 cannot be adjusted, the shape of the base film 2 supported between the upstream guide roll 10 and the coating die 30 can be maintained constant. Therefore, in order to create negative pressure on the surface of the base film 2 upstream of the coating die 30 that faces the coating die 30, the side plate 41 can be formed to match the shape of the base film 2.

[0070] Although the embodiments of the present invention have been described above, the above embodiments merely illustrate some of the application examples of the present invention, and it is not intended that the technical scope of the present invention be limited to the specific configurations of the above embodiments. [Explanation of symbols]

[0071] 1 Coating device 2. Base film (substrate) 2a Coated surface (one side) 3 Coating fluid (coated material) 3a Coating film 4 Space 5 Blower (suction mechanism) 10 Upstream guide roll 10a Bottom 20 Downstream guide roll 30 Coating die 31a Outlet (slit) 32 Rounded part 33 Relief 40 Vacuum box (negative pressure generating mechanism) 41 Side plate 41a End face 42 Box body (suction mechanism) α Embracing angle

Claims

1. A coating device that applies a coating material to a workpiece, an upstream guide roll that guides the object to be coated downstream; a downstream guide roll that is provided at an interval from the upstream guide roll and guides the workpiece guided from the upstream guide roll further downstream; a coating die disposed between the upstream guide roll and the downstream guide roll so as to be pressed against the object to be coated, and discharging the object to be coated from a slit; a negative pressure generating mechanism that generates a negative pressure on a surface of the workpiece that is guided from the upstream guide roll to the coating die and that faces the coating die; Equipped with The negative pressure generating mechanism includes: a side plate having an end face facing the object to be coated that is not supported by the upstream guide roll and the downstream guide roll, and formed along the object to be coated from a position supported by the upstream guide roll to a position facing the coating die; a suction mechanism that sucks air out of a space defined by the side plates that are closed at the sides; having Coating equipment.

2. The coating device according to claim 1, the negative pressure generating mechanism attracts the workpiece, which is not supported by the upstream guide roll and the downstream guide roll, towards the end face of the side plate between the upstream guide roll and the downstream guide roll. Coating equipment.

3. The coating device according to claim 2, the negative pressure generating mechanism reduces the distance between the upstream guide roll and the downstream guide roll and the side plate of the workpiece that is not supported by the upstream guide roll and the downstream guide roll. Coating equipment.

4. The coating device according to any one of claims 1 to 3, The upstream guide roll is set to have a larger wrap angle at which the workpiece contacts than the downstream guide roll. Coating equipment.

5. The coating device according to claim 4, The wrap angle of the upstream guide roll is set to an angle including the bottom of the upstream guide roll. Coating equipment.

6. The coating device according to claim 5, The wrap angle at the upstream guide roll is set to be greater than 90 degrees. Coating equipment.

7. The coating device according to any one of claims 1 to 3, The upstream guide roll is fixed so that the distance to the coating die cannot be adjusted. Coating equipment.

Images