JP4354598B2 - Double side coating type coating equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a double-side coating type coating apparatus capable of simultaneously coating a coating liquid on both surfaces of a web such as a long fabric, a plastic film, a metal sheet, and a net-like or porous metal sheet. .
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a double-sided coating type coating apparatus that arranges a pair of dies on both sides of a web conveyance path and simultaneously coats both sides of the web from these dies is known. For example, in recent years, in the process of manufacturing a spiral lithium battery, an electrode active material is applied to both sides of a long strip of copper foil or aluminum foil.
[0003]
If coating is performed only on one side of the web, coating can be performed on the web on the backup roll from a die disposed on the outer surface side of the backup roll while the web is running along the backup roll. In this case, the position of the web when receiving coating and the smooth running of the web are guaranteed by this backup roll.
[0004]
However, when coating is performed on both sides of the web, the position of the web cannot be directly regulated at a location between a pair of dies to be coated. Also, on the delivery side from the coating location between the dies, the position of the web cannot be regulated until drying is completed. Therefore, in order to keep the coating thickness constant, in order to keep the web position between the pair of dies constant, it is necessary to regulate the running position of the web on the feeding side.
[0005]
A configuration for regulating the web position in the prior art will be described with reference to FIGS.
[0006]
In the prior art 1 shown in FIG. 2, the guide roller 101 is disposed at a position just 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, the position of the web 7 between the discharge ports 32 at the tips of the dies 12 and 14 can be made constant to some extent.
[0007]
However, a certain distance is necessarily present between the position where the web 4 leaves the guide roller 101 and a location where coating is performed (hereinafter referred to as a coating location). In particular, since the space between the dies 12 and 14 is generally small, the guide roller 101 cannot be disposed close to the discharge port 32. Therefore, a distance corresponding to, for example, the dimension in the web running direction of the dies 12 and 14 exists between the position where the web 4 leaves the guide roller 101 and the coating location.
[0008]
As schematically shown in the figure, the web 7 that has left the guide roller 101 generates “sway” and “bend” until it reaches the coating site. Accordingly, the web 7 is coated between the pair of dies in the vertical direction, that is, in a state of swinging in the left-right direction in the drawing or in a state of being somewhat curved toward one side. For this reason, the coating thickness is disturbed on both surfaces of the web 7, such as the pulsation of the coating thickness distribution.
[0009]
In the prior art 2 shown in FIG. 3, a guide bulging portion 201 is provided on the web receiving side lip 27 of either one of the left and right dies 12, 14, and the web 7 fed to the coating site is provided with the guide bulging portion. It is configured to slide along the protruding portion 201. Specifically, the web 7 is fed into the coating portion so as to be bent along the guide bulge portion 201. Even with such a configuration, the coating thickness on both sides can be kept constant to some extent.
[0010]
However, since bending occurs along the bulging portion 201 for guide, it is necessary that the web 7 has sufficient flexibility and toughness, and depending on the material of the web 7, bending and shaking may occur.
[0011]
Moreover, the change of the bulging dimension from the receiving side lip 27 cannot be performed 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 coating, that is, while the web 7 is traveling. Accordingly, it is impossible 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 is running.
[0012]
[Problems to be solved by the invention]
The present invention has been made in view of the above-mentioned problems of the prior art, and when applying to both sides of a web with a pair of dies, keep the distance between the discharge port of these dies and the web constant and stable. Provided is a double-sided coating type coating apparatus capable of
[0013]
[Means for Solving the Problems]
The double-sided coating type coating apparatus according to claim 1 includes a pair of dies provided on both sides of a web conveyance path, and a coating liquid provided along the width direction of the web at the tip of each die. In a double-sided coating type coating apparatus that discharges a predetermined amount of a coating liquid to a discharge outlet and a traveling web and applies the coating liquid to both sides of the web, toward the pair of discharge openings A sliding guide member that regulates the position of the web to be sent is provided along the web conveyance path, and the sliding guide member has a tip on the discharge port side on the guide surface to which the web is sent, It extends to just before a pair of discharge ports.
[0014]
With the above configuration, the distance between the discharge port of the pair of dies and the web can be kept constant.
[0015]
The double-side coating type coating apparatus according to claim 2 is capable of changing the position of the guide member in the thickness direction of the web while the web is running, whereby the distance between each discharge port and the web. Can be changed.
[0016]
With such a configuration, the coating thickness on both sides of the web can be easily adjusted.
[0017]
The double-sided coating type coating apparatus according to claim 3, wherein the guide surface includes a linear portion adjacent to the tip on the discharge port side and a curved portion smoothly connected to the guide surface in a cross section in the running direction of the web. It is characterized by becoming.
[0018]
With such a configuration, the running of the web becomes more stable, the distance between the discharge port and the web can be kept more constant, and undesired bending stress is prevented from being applied to the web.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIG. Drawing 1 is a typical sectional view about the principal part of the coating device of an example.
[0020]
FIG. 1 shows a pair of dies 12 and 14, a web 7 coated thereby, and a guide member 1 that regulates the position of the web 7 that travels between the dies 12 and 14. ing.
[0021]
The pair of dies 12 and 14 apply the coating liquid 8 to both surfaces of the web 7 that runs vertically upward, and have a dimension substantially equal to the width of the web 7 in the width direction of the web 7. The discharge ports 32 at the tips of the dies 12 and 14 are disposed in close proximity to each other, and the web 7 that passes through this and is sent upward is simultaneously coated on both sides at the same height position. The position of the web 7 in the thickness direction (left and 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 varies accordingly.
[0022]
Like the dies 12 and 14, the guide member 1 has a dimension substantially equal to the width of the web 7 in the width direction of the web 7, and in the illustrated example, the cross-section becomes a substantially streamline shape that narrows toward the discharge port 32. I am doing. The guide member 1 includes a guide surface 11 having an arcuate cross section on the side of the traveling web 7 (right side in the drawing), and the web 7 is sent along the guide surface 11. The guide surface 11 is provided with a Teflon coating 13 to facilitate the sliding of the web 7.
[0023]
The upper end portion of the guide member 1 has a sharp knife edge shape toward the discharge port 32, and enters the portion sandwiched between the receiving side lips 27 of the dies 12 and 14. Further, the upper edge 11 a of the guide surface 11 extends to a height position just before reaching the tip 27 a of the web receiving side (lower side) lip 27 of the left die 12. The lip side edge 27a of the guide surface 11 and the receiving side lip 27 may contact each other depending on circumstances.
[0024]
Therefore, the position of the web 7 is sufficiently restricted by the guide surface 11 until just before it is sent to the coating location.
[0025]
Further, in the illustrated example, the guide surface 11 has a sufficient dimension equal to or greater than the dimension of the dies 12 and 14 in the web traveling direction, and has a smooth curve when viewed in cross section. . 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 curvature is gradually reduced at the portion connected to the linear portion. Therefore, even if the rigidity of the web 7 is relatively high, the web 7 can run smoothly without any bending stress being applied to a part thereof.
[0026]
The guide member 1 is attached to a support member having position adjusting means so that the position can be adjusted in the left-right direction of 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 support member are provided separately from the dies 12 and 14, unlike the case of the above-described prior art 2 (FIG. 3), the web is running, that is, the operation of the coating apparatus. Even in the middle, the position of the guide surface 11 can be adjusted. Therefore, even during application by the coating apparatus, the position of the guide surface 11 can be finely adjusted to adjust the coating thickness on both sides to be optimum.
[0027]
Further, 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.
[0028]
In the above description, the guide surface 11 is provided with the Teflon coating 13, but may be coated with other fluororesin. Teflon (registered trademark of DuPont) is, in a narrow sense, tetrafluoroethylene (polytetrafluoroethylene) resin (Teflon TFE), but other perfluoro fluororesins such as tetrafluoroethylene and perfluoroethylene. The same applies to copolymers (Teflon PFA, Teflon FEP) with fluoroalkyl vinyl ether, hexafluoropropylene and the like. Fluorine resins other than perfluoro type, such as tetrafluoroethylene-ethylene copolymer resin, can be used in the same manner.
[0029]
Further, as a recently developed coating material, a composite material of a fluororesin and a metal having a structure in which a fluororesin such as Teflon is impregnated in a metal layer forming chrome plating can be used.
[0030]
In the above description, the web is described as traveling vertically upward, but the same is true even when the web travels horizontally. The same applies when the web runs obliquely upward. When the web travels horizontally or obliquely upward, the guide member 1 can be disposed on the lower side of the web.
[0031]
Further, the guide member 1 has been described as a member having a substantially streamlined cross section. However, a plate member or a hollow member may be used if it has a certain degree of strength and rigidity. Other cross-sectional shapes may be used as long as the same guide surface 11 is formed and can be inserted up to the web receiving side lip 27.
[0032]
Next, the structure of the dies 12 and 14 will be briefly described.
[0033]
As shown in FIG. 1, the pair of dies 12, 14 that are symmetrical to each other has an upper member 16 and a lower member 18 screwed by a plurality of fixing bolts 24. A slit-like discharge passage 30 to the liquid reservoir 22 and the discharge port 32 is formed between the lower member 18 having a recess. A coating liquid supply hose 52 is connected to the liquid reservoir 22 through an inlet 20 that penetrates 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 is provided with a pressure sensor 50 for adjusting the pressure of the liquid reservoir 22.
[0034]
Each of the upper member 16 and the lower member 18 forms a web sending side lip 28 and a web receiving side lip 27 protruding to the web side in the vicinity of the discharge port 32, and between these lips 27, 28, A discharge passage 30 extending to the discharge port 32 extends. The leading ends 27 a and 28 a of the web sending side lip 28 and the web receiving side lip 27 are formed to be parallel to the web 7.
[0035]
In the illustrated example, the web delivery side lip 28 is formed of a member separate from the main body 26 of the upper member 16 having a flat plate shape, and the upper member main body 26 is moved up and down by a bolt 46 parallel to the upper member main body 26. 26. A plurality of adjustment bolts 48 perpendicular to the upper member main body 26 are arranged so as to screw and pass through the support portion 44 extending from the upper member main body 26, and the tip of the adjustment bolt 48 forms the web delivery side lip 28. Contact the member. Therefore, the slit width between the lips 27 and 28 can be adjusted to a predetermined width over the entire web width direction by appropriately turning the adjustment bolts 48 provided in the web width direction.
[0036]
【The invention's effect】
In a double-sided coating type coating apparatus that coats both sides of a web with a pair of dies, the distance between the discharge port of the die and the web can be kept constant and stable over the entire width direction of the web.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional view of the vicinity of 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 web guide.
FIG. 3 is a schematic longitudinal sectional view of the vicinity of a die in another conventional double-sided coating apparatus using a bulging portion from a lip portion of a die as a web guide.
[Explanation 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 Upper part of die
18 Die lower part
26 Die upper part body
27 Web receiving lip
27a Lip tip
28 Web sending lip 7 Web 8 Coating liquid

Claims (4)

A pair of dies provided on both sides of the web conveyance path;
A discharge port for discharging the coating liquid, provided along the width direction of the web at the tip of each die,
In a double-sided coating type coating device that discharges the coating liquid to the traveling web and applies the 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 the web conveyance path, and the sliding guide member is arranged on the guide surface on which the web is sent. The tip on the outlet side extends to just before the pair of discharge ports ,
While the web is running, the position of the guide member can be changed in the thickness direction of the web, whereby the distance between each discharge port and the web can be changed. Mold coating equipment.   2. The double-sided coating according to claim 1, wherein in the cross section in the running direction of the web, the guide surface includes a linear portion adjacent to a tip on the discharge port side and a curved portion smoothly connected thereto. Work type coating equipment.   The double-sided coating type coating apparatus according to claim 1, wherein the guide surface is coated with a fluororesin.   The double-sided coating type coating apparatus according to claim 1, wherein the guide surface is coated with a composite material layer formed by combining a fluororesin and a metal.

Images