JP2013208516A - Coating tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating tool capable of preventing a product from having uneven coating, which is caused by a firmly-stuck material to be produced in a front-side portion of the tip lower surface of one head member, on the coated surface thereof.SOLUTION: A coating tool has a coating head 1 comprising a pair of head members 2, 3. A grooved slot 7, which is opened to the tip of coating head and extended to the longitudinal direction of the coating head, is formed between a pair of the mutually-opposed inside surfaces of the head members so that a coating liquid T is made to flow through the slot and discharged from the tip of the coating head. Shotblasting treatment is performed on the tip lower surface 2B of one head member 2 positioned on the upstream side of an object, which is to be coated and is moved relatively to the coating head, in order to enhance the wettability thereof to the coating liquid.

Description

  The present invention relates to a coating tool used when a coating liquid is applied to the surface of a member to be coated such as a sheet-like member or a panel-like member.

    2. Description of the Related Art Conventionally, a coating tool has a coating head composed of a pair of head members, and a pocket to which coating liquid is supplied between mutually facing side surfaces of the pair of head members, and from this pocket to the tip side. There is known one in which a groove-like slot that extends and opens at the tip of the coating head is defined (see, for example, Patent Document 1).

    Such a coating tool is mounted on the coating apparatus so that the tip of the coating head is disposed opposite to the object to be coated and the longitudinal direction of the coating head (longitudinal direction of the slot) is aligned with the width direction of the object to be coated. The

  Then, the coating liquid supplied from the coating liquid tank into the pocket by the supply pump flows through the slot and is discharged from the tip of the coating head, so that the discharged coating liquid is relative to the coating head. It is applied to the surface of the object to be moved.

JP 2002-45763 A

By the way, the conventional coating tool described above has the following problems.
That is, as shown in FIG. 4A, when the coating liquid T flows through the slot 103 formed between the pair of head members 101 and 102 and is discharged from the tip of the coating head 100, the coating tool is Due to external factors such as changes in the temperature and humidity of the chamber in which the chamber is disposed, the distance between the tip of the coating head 100 and the object 104 to be coated, or internal factors such as changes in the properties of the coating liquid T itself, The front end position of the bead B formed by the coating liquid T between the pair of head members 101 and 102 and the workpiece 104 changes back and forth.
Here, the front-rear direction is determined with reference to the relative movement direction of the object 104 to the application head 100, and the object 104 moves relative to the application head 100 as shown in FIG. In this case, the base end side (right side in the figure) of the arrow that is the moving direction is defined as the front side, and the tip end side (left side in the figure) of the arrow is defined as the rear side.

  Then, when the front end of the bead B moves to the front side, the coating liquid T adheres to the front side portion 101A of the lower surface of the front end of one (front side) head member 101. Next, as shown by a two-dot chain line in the figure, if the front end of the bead B moves backward and the time continues for a certain length of time, the coating liquid once adhered to the front portion 101A on the lower surface of the front end of the front head member is removed. Dry and solidify. Hereinafter, by repeating such adhesion and drying, as shown in FIG. 4B, a fixed material 106 in which the coating liquid is solidified is generated in the front portion 101 </ b> A on the lower surface of the front end of the front head member 101. When the fixed object 106 is generated in the front portion 101A on the lower surface of the front end of the front head member as described above, streaks are generated on the application surface of the article 104 to be coated, or air is entrained in the bead B. There is a problem that air marks are generated on the coated surface, or the fixed object 106 falls and enters the coated surface as foreign matter.

    The present invention has been made under such a background, and provides an application tool capable of preventing a defective application surface of a product due to the occurrence of a fixed substance on the front side portion of the lower surface of the tip of one head member. The purpose is to do.

    In order to solve the above problems and achieve such an object, the coating tool of the present invention has a coating head composed of a pair of head members, and a pair of inner surfaces facing each other in the head members. A groove-shaped slot that opens at the tip of the coating head and extends in the longitudinal direction of the coating head is defined between the coating head and the coating liquid that flows through the slot and is discharged from the tip of the coating head. A shot blasting treatment is performed to improve wettability on the lower surface of the tip of one of the pair of head members, which is located upstream of the workpiece to be moved relative to the coating head. It is characterized by what is being done.

  Therefore, according to such an application tool, shot blasting is performed on the lower surface of the tip of one head member located on the upstream side of the object to be coated, and this portion becomes smooth and wettability to the coating liquid is improved. . For this reason, when the coating liquid is applied to the object to be coated, the front end position of the bead formed between the pair of head members and the object to be coated changes forward and backward due to an external factor or an internal factor. However, the bead is maintained in contact with the lower surface of the front end of one of the head members, in particular, the front portion, in which wettability is improved. That is, during application, the front portion of the lower surface of the tip of one head member is maintained in a state immersed in the application liquid. Therefore, it is possible to avoid a situation where the coating liquid dries and the fixed matter accumulates in the front side portion of the lower surface of the tip of the one head member.

Here, it is preferable that the projection material used in the shot blasting process is softer than the material constituting the one head member.
By using such a projection material, the grinding process for shot beaning is not a uniform grinding process for the lower surface of the tip of the head member, but a grinding process that selectively grinds the protrusions from the lower surface. Small amount of processing. As a result, it is possible to perform processing that further increases the smoothness of the lower surface of the tip of the head member, and it is possible to sufficiently improve the wettability of the lower surface of the tip with respect to the coating liquid.

  As described above, according to the present invention, even when the application conditions of external factors or internal factors change during application, the front side portion of the lower surface of the tip of one head member is immersed in the application liquid of the bead. Therefore, the situation in which the coating liquid dries and the adhering matter accumulates in the front side portion of the lower surface of the tip of the one head member can be avoided. As a result, it is possible to prevent a defective application surface of the product due to the occurrence of a fixed substance on the lower surface of the tip of one head member.

It is a front view which shows embodiment of the coating tool of this invention. It is II sectional drawing in FIG. It is an expanded sectional view of the blade edge | tip part tip in FIG. It is an expanded sectional view of the edge part tip of the conventional application tool.

An embodiment of the application tool of the present invention will be described with reference to FIGS. FIG. 1 is a front view of a coating tool, and FIG. 2 is a sectional view taken along line II in FIG.
The coating tool of this embodiment has a coating head 1 whose longitudinal direction is the left-right direction in FIG. 1, and this coating head 1 is composed of a pair of left and right head members 2, 3 in FIG. 2. In the present embodiment, the head members 2 and 3 are entirely formed of a cemented carbide alloy, have substantially symmetrical shapes with each other, and are inserted into one head member (right head member in FIG. 2) 2. The bolt 4 is screwed to the other head member (the left head member in FIG. 2) 3 so that the both end portions in the longitudinal direction of the inner side surfaces 2A and 3A are brought into close contact with each other.

  In this embodiment, the coating head 1 integrated in this way is so that its tip (lower part in FIGS. 2 and 3) has an isosceles right triangle shape as shown in FIG. 2 when viewed from the longitudinal direction. The protruding edge 5 is formed, and the rear end (upper side in FIGS. 2 and 3) has a rectangular shape having a width larger than the base of the right isosceles triangle, and the outer shape is closely attached. The inner side surfaces 2A and 3A are substantially symmetrical. Note that, at both ends in the longitudinal direction where the inner side surfaces 2A and 3A are in close contact with each other, a step portion 6 slightly retracted by one step from the projected right angle corner of the right isosceles triangle is formed at the tip of the blade edge portion 5. Is formed.

  Further, in the longitudinal central portion of the inner side surfaces 2A and 3A, which are in close contact with both longitudinal ends, a slot 7 through which a coating solution, for example, a composition for forming an electrode of a lithium ion battery, circulates is the stepped portion. It is formed so as to open at the tip of the blade edge portion 5 on the inner side in the longitudinal direction from 6 and extend in the longitudinal direction, and to penetrate the coating head 1 in the vertical direction of the coating head 1. Here, in the present embodiment, the slot 7 is formed such that, for example, the inner surface 2A of one head member 2 of the pair of head members 2 and 3 is formed on a flat surface including both ends in the longitudinal direction, and the other head. A central portion in the longitudinal direction of the inner side surface 3A of the member 3 is slightly recessed with respect to both end portions, thereby forming between the inner side surfaces 2A and 3A in close contact with each other.

  The width between the pair of head members 2 and 3 of the slot 7 formed in this way is small on the blade edge part 5 side, and is about ½ between the tip of the blade edge part 5 and the rear end surface of the coating head 1. From the position, it is slightly wider on the rear end side so as to reach the rear end surface. The length of the slot 7 in the longitudinal direction is slightly longer at both ends in the longitudinal direction on the rear end side that is slightly wider than the blade edge 5 side thus reduced in width. Has been.

  Of the pair of head members 2 and 3, one of the head members 2 (the right-side head member 2 in FIGS. 2 and 3) located on the upstream side of the workpiece 10 that moves relative to the coating head 1. A shot blasting process is performed on the tip lower surface 2B formed in a flat shape in order to improve wettability to the coating liquid. Here, the location where shot blasting is performed is the tip lower surface 2B of one head member 2, but the present invention is not limited to this, and shot blasting is also performed on the tip lower surface 3B of the other head member 3. Also good.

  In performing the shot blasting process, as the projection material, a material softer than the cemented carbide, which is the material constituting the head members 2 and 3, such as an alumina abrasive and a vitreous abrasive is used. The head members 2 and 3 are ground over the entire outer surface, and then the shot blast process is performed on the lower end surface 2B of the head member 2 as described above. The shot blast treatment is performed until the surface roughness after the treatment is about 3.2 μm or less at the maximum height Rz in JIS B 0601-2001.

    Next, a coating method using the coating tool having the above configuration will be described. The coating head 1 is disposed in such a manner that the tip 5 of the coating head is opposed to the surface of a substrate 10 of a lithium ion battery, for example, which is an object to be coated, and is distributed in the slot 7 from the rear end side. The electrode forming composition T, which is a coating solution, is relatively moved in the direction perpendicular to the longitudinal direction along the surface of the substrate 10 while being discharged from the tip opening of the blade edge portion 5. The electrode forming composition T is applied to the surface of the film.

    Here, when the electrode-forming composition T is discharged from the tip opening of the blade edge portion 5 and applied to the surface of the substrate 10, the temperature and humidity of the chamber in which the application tool is disposed, the blade edge portion 5, The front end of the bead B formed between the blade edge portion 5 and the substrate 10 due to an external factor such as a change in the distance to the substrate 10 or an internal factor such as a change in the properties of the electrode forming composition T itself. The position tries to change back and forth.

  However, here, shot blasting is performed on the lower surface 2B of the tip of one head member 2 located on the upstream side of the substrate 10, and this portion is smoothed to improve the wettability to the coating liquid. When the coating solution is water-soluble, the hydrophilicity is enhanced at the location where the shot blasting process has been performed. For this reason, as described above, even if the front end position of the bead B between the blade edge portion 5 and the substrate 10 is about to change back and forth, the bead B is separated from the lower substrate 10 as shown by a two-dot chain line in FIG. Although the boundary portion of the head member 2 changes back and forth, the boundary portion between the upper one head member 2 and the tip lower surface does not change back and forth, and remains in contact with the front side portion of the tip lower surface 2B of the head member 2. . That is, during application, the front side portion of the lower end surface 2B of one head member 2 is maintained in a state of being immersed in the application liquid.

For this reason, it is possible to avoid a situation in which a sticking substance accumulates in the front side portion of the tip lower surface 2B of one head member 2 as the coating liquid dries and solidifies. Therefore, streaks are generated on the coated surface of the substrate 10 as a product, which is a problem associated with the occurrence of a fixed substance on the front side of the front end lower surface 2B of one head member 2, and air is introduced into the bead B. It is possible to suppress the occurrence of air marks on the coated surface accompanying the entrainment, or the adhering matter falling and mixing as a foreign substance on the coated surface.
As a result, even if the composition is continuously applied to a large number of substrates 10 without cleaning the tip lower surface 2B of one head member 2 or greatly reducing the cleaning frequency, the coating film The thickness can be made uniform with good reproducibility, and a stable electrode can be formed over a long period of time by the die coating method.

In the coating tool of the present embodiment, the pair of head members 2 and 3 are made of cemented carbide, but the present invention is not limited to this, and the head members 2 and 3 are made of stainless steel. The present invention is applicable.
Moreover, in the coating tool of this embodiment, although the front end lower surfaces 2B and 3B of the pair of head members 2 and 3 are in a flat shape parallel to each other, the present invention is not limited to this, and the head members 2 and 3 The present invention can also be applied to the case where the bottom surface of the tip is formed in a circular arc shape or inclined obliquely.

  A pair of head members 2 described in the above embodiment has substantially the same configuration, and the tip bottom surface 2B has different properties, and a copper foil that is a substrate of a lithium ion battery that is an object to be coated The situation when the negative electrode solution for a lithium ion battery as a coating solution was applied was examined. The results are shown in Table 1.

  Here, the comparative example 1 is a state of the irregular surface property having regularity in which the tip lower surface 2B of the head member 2 is still ground and the surface roughness is 0.4 μm at the maximum height Rz. It has been done. In Comparative Example 2, the bottom surface 2B of the front end of the head member 2 remains in a ground state, and the surface roughness is a regular uneven surface property with a maximum height Rz of 1.6 μm. It is. In Comparative Example 3, the lower surface 2B of the front end of the head member 2 remains in a ground state, and the surface roughness is a regular uneven surface texture with a maximum height Rz of 3.2 μm. It is. In Example 1, the lower surface 2B of the front end of the head member 2 was shot blasted after grinding, and the surface roughness was irregular irregular surface properties with a maximum height Rz of 1.6 μm. It is. In Example 2, the tip lower surface 2B of the head member 2 was subjected to shot blasting after grinding, and the surface roughness was irregular irregular surface properties with a maximum height Rz of 3.2 μm. It is.

  Here, the shot blasting treatment was performed for about 10 seconds with an alumina abrasive # 80 under a pressure of about 500 kPa.

In Comparative Examples 1 and 2, rubbing was gradually observed on the coated surface just before the completion of coating. In addition, a fixed matter generated by drying and solidifying the negative electrode liquid for a lithium ion battery, which is a coating liquid, was generated on the front side portion of the lower end surface 2B of the head member 2. In Comparative Example 3, rubbing started after a while after the disclosure of the coating, and streaks finally occurred. In addition, a fixed matter generated by drying and solidifying the negative electrode liquid for a lithium ion battery was generated on the front side portion of the lower end surface 2B of the head member 2.
On the other hand, in Examples 1 and 2, no abnormality occurred on the coated surface even when the coating was continuously performed. Further, no fixed matter was generated on the lower surface 2B of the front end of the head member 2.
From the above, according to the present embodiment, it is confirmed that there is no abnormality in the coated surface that is the product, and that no sticking material is generated on the lower end surface 2B of the head member 2 on the upstream side of the coated object. It was.

DESCRIPTION OF SYMBOLS 1 Coating head 2, 3 Head member 2A, 3A Inner side surface 2B, 3B head lower surface 5 Head edge part 7 Slot 10 Lithium ion battery board | substrate (to-be-coated object)
T electrode forming composition (coating solution)
B Bead

Claims (2)

A coating head having a coating head composed of a pair of head members, and having a groove-like shape that opens at the tip of the coating head and extends in the longitudinal direction of the coating head between a pair of mutually facing inner side surfaces of the head member A coating tool in which a slot is defined, and a coating liquid flows through the slot and is discharged from the tip of the coating head,
Of the pair of head members, shot blasting is performed on the lower surface of the tip of one head member positioned upstream of the object to be moved relative to the coating head in order to improve wettability. An application tool characterized by   The coating tool according to claim 1, wherein a projection material used in the shot blasting process is softer than a material constituting the one head member.

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