JP2001170541A - Double side-coating type coating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double side-coating type coating machine which coates both sides of a web 7 by a pair of dies 12 and 14, and can keep a clearance between a discharge opening 32 of those dies 12 and 14 and the web 7 constant and stable over the whole in a width direction of the web 7. SOLUTION: A guide component 1 for controlling a position of the web 7 sent into the discharge opening 32 just before coating, is provided. A guide surface 11 of the guide components 1 has a section of an arcuated state bulged to the web side 7, and its upper end 11a extends about a web receiving side lip 27. The guide surface 11 gradually decreases a curvature onto its discharge opening 32 side, and forms a rectilinear state near the upper end 11a. Further, the guide component 1 is provided separately from the dies 12 and 14, and an be adjusted in position in the web width direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a double-sided coating which can simultaneously apply a coating liquid to both sides of a web such as a long fabric, a plastic film, a metal sheet, and a mesh or porous metal sheet. The present invention relates to a coating type coating apparatus.

[0002]

2. Description of the Related Art There has been known a double-side coating type coating apparatus in which a pair of dies is disposed on both sides of a web transport path and the dies are simultaneously coated on both sides of the web. For example, in recent years, in a process of manufacturing a spiral lithium battery, an electrode active material has been applied to both surfaces of a long strip of copper foil or aluminum foil.

If the coating is performed only on one side of the web, the web on the backup roll can be coated from a die arranged on the outer surface side of the backup roll while running the web along the backup roll. . In this case, the position of the web when receiving the coating, and
The smooth running of the web is guaranteed by this backup roll.

However, when coating is performed on both sides of the web, it is not possible to directly control the position of the web at a location between a pair of dies to be coated. In addition, the position of the web cannot be regulated from the application point between the dies to the delivery side until the drying is completed. Therefore, in order to keep the position of the web between the pair of dies to keep the coating thickness constant, it is necessary to regulate the running position of the web on the side where the web is fed to the coating location.

A configuration for regulating the position of the web in the prior art will be described with reference to FIGS.

In the prior art 1 shown in FIG. 2, the guide roller 101 is disposed at a position slightly before the web 7 is fed between the dies 12 and 14. Specifically, the web 7 is configured to change the traveling direction along the guide roller 101 by several tens of degrees. Thereby, die 1
The position of the web 7 between the discharge ports 32 at the tip ends of 2, 14 can be made constant to some extent.

[0007] However, the web 4 is
Inevitably, there is a certain distance between the position away from and the location where the coating is performed (hereinafter referred to as the coating location). In particular, generally, the die 12,
Because the space between the guide rollers 14 is small,
01 cannot be arranged close to the discharge port 32.
Therefore, between the position where the web 4 is separated from the guide roller 101 and the coating location, there is a distance corresponding to, for example, the dimension of the dies 12 and 14 in the web running direction.

[0008] As schematically shown in the figure, the web 7 that has left the guide roller 101 generates "swaying" or "bending" before reaching the coating location. Therefore, the web 7 is subjected to coating between a pair of dies in a state of being swung in the vertical direction, that is, the left and right direction in the drawing, or in a state of being slightly curved to one side. For this reason, the coating thickness is disturbed on both sides of the web 7, such as the pulsation of the coating thickness distribution.

In the prior art 2 shown in FIG. 3, the web receiving side lip 27 of one of the left and right dies 12 and 14 is provided.
In addition, a guide bulging portion 201 is provided so that the web 7 fed to the coating location slides along the guide bulging portion 201. Specifically, Web 7
Bend along the guide bulge 201,
It is sent to the coating area. Even with such a configuration,
The coating thickness on both sides can be kept constant to some extent.

However, since the web 7 is bent along the bulging portion 201 for guide, the web 7 needs to have sufficient flexibility and toughness. There is.

Further, the swelling dimension from the receiving lip 27 cannot be changed so easily. In particular, it is impossible to change the position of the web 7 in the left-right direction at the coating location during the coating, that is, while the web 7 is running. Therefore, it was not possible to adjust the coating thickness on the left and right surfaces of the web 7 by shifting the position of the web 7 in the left-right direction while the web 7 was running.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art. When coating is performed on both sides of a web with a pair of dies, the discharge port of the dies and the web are not used. The present invention provides a double-sided coating type coating apparatus capable of maintaining a constant and stable interval between the coatings.

[0013]

According to a first aspect of the present invention, there is provided a double-sided coating type coating apparatus, comprising: a pair of dies provided on both sides of a web transporting path; In a double-sided coating type coating apparatus, which is provided with a discharge port for discharging a coating liquid, and discharges a predetermined amount of a coating liquid onto a running web, and applies a coating liquid to both sides of the web. A sliding guide member for regulating the position of the web sent to the pair of discharge ports is provided along a web transport path, and the sliding guide member is provided on the guide surface on which the web is transmitted and sent. The end on the side of the discharge port extends to just before between the pair of discharge ports.

With the above configuration, the distance between the discharge port of the pair of dies and the web can be kept constant.

According to a second aspect of the present invention, the position of the guide member can be changed in the thickness direction of the web while the web is running, whereby each of the discharge ports and the web can be changed. And the interval between them can be changed.

With such a configuration, the coating thickness on both sides of the web can be easily adjusted.

According to a third aspect of the present invention, in the double-side coating type coating apparatus, in the cross section in the running direction of the web, the guide surface is a straight line portion adjacent to the tip on the side of the discharge port and a curve smoothly connected to the straight portion. And a part.

With such a configuration, the running of the web is
It becomes more stable, the interval between the discharge port and the web can be kept more constant, and the application of undesired bending stress to the web can be prevented.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. Drawing 1 is a typical sectional view about an important section of a coating device of an example.

FIG. 1 shows a pair of dies 12 and 14, a web 7 to be coated thereby, and a guide member 1 for regulating the position of the running web 7 between the dies 12 and 14. It is shown.

The pair of dies 12 and 14 apply the coating liquid 8 to both surfaces of the web 7 running vertically upward, and have a dimension substantially equal to the width of the web 7 in the width direction of the web 7. Have. The discharge ports 32 at the tips of the dies 12 and 14 are arranged close to each other, and the web 7 that is passed through the gap and fed upward is simultaneously coated on both surfaces at the same height position. The position of the web 7 in the thickness direction (the left-right direction in the drawing) at the coating location, that is, the distance between the web 7 and each discharge port 32 greatly affects the coating thickness. If the position of the web 7 is shifted in the width direction, the coating thickness will fluctuate accordingly.

The guide member 1 is similar to the dies 12 and 14,
It has a dimension substantially equal to the width of the web 7 in the width direction of the web 7, and has a substantially streamline shape in which the cross section becomes narrower toward the discharge port 32 in the illustrated example. The guide member 1 has a guide surface 1 having an arcuate cross section on the side of the traveling web 7 (right side in the figure).
The web 7 is fed along a guide surface 11. The guide surface 11 is provided with a Teflon coating 13 to facilitate sliding of the web 7.

The upper end portion of the guide member 1 is shaped like a knife edge which is pointed toward the discharge port 32 side.
Into the portion sandwiched between the receiving side lips 27. The upper edge 11a of the guide surface 11 is connected to the tip 27a of the lip 27 on the web receiving side (lower side) of the left die 12.
To the height just before reaching. Guide surface 1
In some cases, the lip side edge 27a and the receiving side lip 27 may be in contact with each other.

Therefore, the position of the web 7 is sufficiently regulated by the guide surface 11 until immediately before it is sent to the coating location.

In the illustrated example, the guide surface 11 has a sufficient dimension which is equal to or larger than the dimension of the dies 12 and 14 in the web running direction, and has a smooth curve when viewed in cross section. No. Specifically, the cross section of the guide surface 11 is composed of a linear portion that matches the path of the web 7 after coating, and a curved portion that smoothly connects to the linear portion. The curved portion is also configured so that the curvature gradually changes, and the portion connected to the linear portion gradually decreases in curvature. for that reason,
Even when the rigidity of the web 7 is relatively high, the web 7 can run smoothly without applying a bending stress or the like to a part.

The guide member 1 is attached to a support member provided with a position adjusting means so that the position can be adjusted in the horizontal direction in the drawing. For example, the position of the guide member 1 and the guide surface 11 can be adjusted by turning an adjustment screw. Here, since the guide member 1 and its supporting member are provided separately from the dies 12, 14, unlike the case of the above-described prior art 2 (FIG. 3), the running of the web, that is, the operation of the coating apparatus is performed. Even in the middle, the position of the guide surface 11 can be adjusted. Therefore, even during the application by the application device, the position of the guide surface 11 can be finely adjusted to adjust the application thickness on both sides to be optimal.

Since the guide member 1 and the support member can be configured to have sufficiently high dimensional accuracy over the entire length in the web width direction, the position of the web 7 can be regulated with sufficient accuracy.

In the above description, the guide surface 11 is provided with the Teflon coating 13, but may be coated with another fluorine resin. Teflon (registered trademark of DuPont)
Is, in a narrow sense, a tetrafluoroethylene (polytetrafluoroethylene) resin (Teflon TFE), but other perfluoro fluorine resins, for example, tetrafluoroethylene, perfluoroalkyl vinyl ether, hexafluoropropylene, etc. (Teflon PFA, Teflon FE
The same is true for P). Fluororesins other than perfluoro-based resins, for example, tetrafluoroethylene-ethylene copolymer resins, can also be used.

Further, as a recently developed coating material, a composite material of a fluororesin and a metal having a structure in which a fluorochrome such as Teflon is impregnated into a chromium-plated metal layer can be used.

Although the above description has been made on the assumption that the web travels vertically upward, the same applies to the case where the web travels horizontally. The same applies to the case where the web runs obliquely upward. When the web runs horizontally or obliquely upward, the guide member 1 can be arranged below the web.

Although the guide member 1 has been described as a member having a substantially streamlined cross section, a plate member or a hollow member may be used as long as it has a certain strength and rigidity. Other cross-sectional shapes may be used as long as the guide surface 11 is formed in a similar manner and can be inserted up to the web receiving side lip 27.

Next, the structure of the dies 12, 14 will be briefly described.

As shown in FIG. 1, a pair of symmetrical dies 12 and 14 are respectively provided with an upper member 16 and a lower member 18.
Are screwed by a plurality of fixing bolts 24, and a liquid reservoir 22 and a slit-like discharge passage 30 to a discharge port 32 are provided between the flat upper member 16 and the lower member 18 having a concave portion. Is formed. A coating liquid supply hose 52 is connected to the liquid reservoir 22 through an inlet 20 penetrating the lower surface of the lower member 18, and the coating liquid 8 is supplied from a metering pump. In the illustrated example, the upper member 16 includes the liquid reservoir 2.
2 is provided with a pressure sensor 50 for adjusting the pressure.

The upper member 16 and the lower member 18 are respectively
A web delivery side lip 28 and a web reception side lip 27 protruding toward the web are formed near the discharge port 32, and a discharge passage 30 extending to the discharge port 32 extends between these lips 27, 28. I have. Web sending side lip 28
And the tips 27a, 28a of the web receiving lip 27
It is formed so as to form a plane parallel to the web 7.

In the illustrated example, the web delivery lip 28 is
The upper member 16 is formed of a separate member from the main body 26 of the upper member 16 and is attached to the upper member main body 26 by means of a bolt 46 which is parallel to the upper member main body 26 so as to move up and down.
Then, a plurality of adjustment bolts 4 perpendicular to the upper member body 26 are provided.
8 is disposed so as to screw and pass through a support portion 44 extending from the upper member main body 26, and the tip of the adjustment bolt 48 abuts on a member forming the web delivery side lip 28. Therefore,
By appropriately turning each adjustment bolt 48 provided in the web width direction, the slit width between the lips 27 and 28 can be adjusted to have a predetermined width over the entire web width direction.

[0036]

As described above, in a double-sided coating type coating apparatus for coating both sides of a web with a pair of dies, the distance between the discharge port of these dies and the web is kept constant and stable over the entire width direction of the web. Can be.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view around a die in a double-sided coating apparatus according to an embodiment.

FIG. 2 is a schematic longitudinal sectional view of the vicinity of a die in a conventional double-sided coating apparatus using a guide roller as a guide for a web.

FIG. 3 is a schematic longitudinal sectional view of the vicinity of a die in another conventional double-sided coating apparatus using a bulge from a lip of the die as a web guide.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Guide member 11 Guide surface 11a Lip side edge of guide surface 12 Left die 13 Teflon coating 14 Right die 16 Die upper member 18 Die lower member 26 Die upper member main body 27 Web receiving side lip 27a Lip tip 28 Web Delivery side lip 7 Web 8 Coating liquid

Continuation of the front page (72) Inventor Takeo Hiasa 101, Kawai-cho, Kawai-cho, Kitakatsuragi-gun, Nara 1 Hirano Techseed Co., Ltd. F-term (reference) 4F041 AA12 AB01 BA05 BA17 BA24 BA36 BA56 CA03 CA13 CA16 CA22 4F042 AA22 BA08 DF27 DF30

Claims (5)

[Claims] 1. A pair of dies provided on both sides of a web transport path, and a discharge port for discharging a coating liquid provided at a tip end of each of the dies along a width direction of the web, and running. In a double-sided coating type coating apparatus that discharges a coating liquid onto a web and coats the coating liquid on both sides of the web, a slide that regulates a position of the web sent to the pair of discharge ports. A guide member is provided along the transport path of the web, and the sliding guide member is configured such that a tip of the guide surface on which the web is transported and fed is located just before the pair of discharge ports. A double-sided coating type coating apparatus. 2. The method according to claim 1, wherein the position of the guide member can be changed in the thickness direction of the web while the web is running, whereby the distance between each of the discharge ports and the web can be changed. The double-sided coating type coating apparatus according to claim 1, wherein 3. The cross section in the running direction of the web, wherein the guide surface comprises a linear portion adjacent to a tip on the side of the discharge port, and a curved portion connected smoothly to the linear portion. 2. The double-sided coating type coating apparatus according to 1. 4. The double-side coating type coating apparatus according to claim 1, wherein said guide surface is coated with a fluororesin. 5. The double-side coating type coating apparatus according to claim 1, wherein said guide surface is coated with a layer of a composite material comprising a composite of a fluororesin and a metal.