JP7302240B2 - coating head - Google Patents

Description

TECHNICAL FIELD The present invention relates to a coating head for applying a coating liquid to a member to be coated such as film, paper, glass substrate, and metal foil.

A slit die is known as a coating head for applying a coating liquid to a member to be coated such as a film or a glass substrate. In recent years, slit dies have been applied to many fields and have come to be used for coating various coating liquids.

A slit die has a configuration in which two lip members are placed facing each other, and between the lip members are a manifold for expanding the width of the supplied coating liquid in the longitudinal direction, and a longitudinal lip for discharging the coating liquid. A discharge port extending in a direction and a slit communicating between the manifold and the discharge port are formed. A uniform coating film can be formed on the surface of the member to be coated by moving the ejection port of the slit die close to the member to be coated and moving the coating liquid relative to the member to be coated.

Since the coating accuracy of the slit die is determined by the feeding accuracy of the coating liquid fed and the processing accuracy of the slit die itself, stable coating quality can be achieved regardless of the skill level of the operator.

However, depending on the composition of the coating fluid, it may contain hard particles such as glass or ceramic particles, as well as fillers. There is a problem that the coating quality deteriorates due to excessive wear. Therefore, in order to achieve stable production over the long term, it is extremely important to maintain the high-precision machining conditions at the time of delivery.

To solve this wear problem, it can be easily imagined to apply high-hardness materials such as cemented carbide and ceramics to the material of the slit die. It is not realistic because the cost increases significantly. Therefore, Patent Document 1 discloses a method for improving wear resistance by incorporating a tip member made of cemented carbide only on the outlet side of the lip member.

Japanese Patent Application Laid-Open No. 2002-224607

However, in the method disclosed in Patent Document 1, the hardness of the tip member of the slit die is increased, and although the wear resistance of the discharge port and the slit portion near the discharge port is improved, the manifold and the slit portion near the manifold are worn. progresses. That is, the slit near the discharge port and the slit near the manifold have a difference in the speed of progress of wear, and a step inevitably occurs at the seam portion between different materials existing in the middle of the slit. Since such a stepped portion becomes a place where the coating liquid stays, deterioration of the coating liquid is accelerated. Then, the outflow of the degraded coating liquid causes a poor appearance, resulting in a serious trouble that significantly lowers the production yield.

Furthermore, in the method disclosed in Patent Document 1, for example, when a low-viscosity coating liquid is handled, the coating liquid may penetrate into the joints between different materials due to surface tension, so the coating deteriorates during coating. There is also a risk that the working fluid will flow out little by little, causing a problem that causes a poor appearance.

SUMMARY OF THE INVENTION Accordingly, the present invention provides a coating head capable of improving abrasion resistance and performing stable coating without causing poor coating appearance due to deterioration of the coating liquid.

A coating head of the present invention for solving the above problems is a coating head in which two lip members are assembled directly or via another member,
Between the two lip members, a manifold for expanding the width of the coating liquid in the longitudinal direction of the coating head, and a discharger extending in the longitudinal direction of the coating head for discharging the coating liquid from the coating head. having an outlet and a slit communicating between the manifold and the outlet;
A channel forming member is detachably attached to each of the two lip members so as to face each other,
The passage forming member attached to at least one of the two lip members is formed with a recess forming the manifold together with the passage forming member attached to the other lip member,
A gap extending from the manifold portion to the outside of the coating head is provided between the two flow path forming members, and this gap constitutes the slit and the ejection port.

The coating head of the present invention has, between the lip member and the flow path forming member attached to the lip member, a dimension adjusting member for adjusting the mounting position of the flow path forming member with respect to the lip member. may

By using the coating head of the present invention, it is possible to increase the hardness of the part through which the coating liquid passes and improve the abrasion resistance without causing poor coating appearance due to wear, and it is possible to improve wear resistance in the long term. Stable coating becomes possible.

1 is a cross-sectional view showing a schematic configuration of a coating head of the present invention; FIG. 2 is a schematic perspective view of the coating head of FIG. 1 with lip members 1 and 2 separated from each other; FIG. FIG. 2 is a cross-sectional view taken along line AA of FIG. 1 and is a front view of the interior of the coating head. FIG. 4 is a cross-sectional view showing a schematic configuration of a coating head 200 that is another embodiment of the present invention; FIG. 5 is a cross-sectional view taken along line BB of FIG. 4 and is a front view of the inside of the coating head. FIG. 3 is a perspective view of a coating head 300 according to another embodiment of the present invention, with lip members 301 and 302 and a shim 320 separated.

EMBODIMENT OF THE INVENTION Hereinafter, with reference to drawings, embodiment of the coating head which concerns on this invention is described. However, the present invention is not limited to the forms shown in the drawings.

Please refer to FIGS. FIG. 1 is a cross-sectional view showing a schematic configuration of a coating head 100 of the present invention. FIG. 2 is a schematic perspective view of the coating head 100 of the present invention in which the lip members 1 and 2 are separated from each other.

As shown in FIG. 1, a coating head 100 of the present invention is constructed such that lip members 1 and 2 face each other. A channel forming member 3 is detachably attached to the surface of the lip member 1 facing the lip member 2, and a channel forming member 4 is detachably attached to the surface of the lip member 2 facing the lip member 1, The flow path forming members 3 and 4 also face each other. The lip members 1 and 2 have a shape elongated in a direction perpendicular to the cross section, that is, in the Y-axis direction shown in FIG. The flow path forming members 3 and 4 also have the same length in the Y-axis direction as the lip members 1 and 2 to which they are attached.

As shown in FIG. 2, the flow path forming members 3 and 4 are formed with recesses 5a and 5b (not shown) extending in the Y-axis direction on surfaces facing each other. A surface on which the recess 5a of the flow path forming member 3 attached to the lip member 1 is formed, and a surface on which the recess 5b (not shown) of the flow path forming member 4 attached to the lip member 2 is formed. By combining the lip member 1 and the lip member 2 in a state in which they face each other, a manifold 5 extending in the Y-axis direction is configured as shown in FIG.

As shown in FIG. 1, in a state where the lip member 1 and the lip member 2 are assembled, the portion from the manifold 5 to the outside of the coating head 100 between the flow path forming member 3 and the flow path forming member 4 is formed. A gap is provided in the portion (the portion in the Z-axis downward direction from the manifold 5). This gap constitutes the slit 6 and the exit portion of the gap constitutes the discharge port 7 .

Manifold 5 is not limited to being substantially circular as shown in FIG. Recesses 5a (5b) are formed in only one of the flow path forming member 3 and the flow path forming member 4, and the other is left substantially flat without forming the recesses 5b (5a), resulting in a substantially semicircular manifold. 5 may be configured. Further, it may be a straight type having the same cross-sectional shape in the Y-axis direction as shown in FIG. 2, or a coat-hanger type having a shape in which the cross-sectional area is reduced toward the ends in both Y-axis directions. Furthermore, there may be two or more manifolds 5 .

The slit 6 has a narrow clearance t in the X-axis direction. The gap amount t is a dimension designed according to the liquid physical properties of the coating liquid 10, and is a dimension that allows the coating liquid 10 to be uniformly discharged. If the viscosity of the coating liquid 10 is in the range of about 1 to 10000 mPa·s, the clearance t is preferably in the range of 50 μm to 500 μm.

When performing coating, the coating liquid 10 supplied to the coating head 100 is expanded in both Y-axis directions by the manifold 5, passes through the slit 6, and is discharged from the discharge port 7 downward in the Z-axis direction. be. A member to be coated (not shown) is relatively moved in the X-axis direction while maintaining a state of being close to the coating head 100 by several microns to several hundred microns. A coating liquid 10 is applied onto a member to be coated.

As the material for the lip members 1 and 2, stainless steel, which is relatively inexpensive and has excellent chemical resistance, is preferably used. In order to improve wear resistance, a surface treatment may be applied to form a hard phase typified by tungsten carbide or DLC.

Although stainless steel may be used as the material for the flow path forming members 3 and 4, it is not preferable when handling a coating liquid containing high-hardness particles or fillers. This is because the flow path forming members 3 and 4 constitute the manifold 5, the slit 6, and the discharge port 7, so that they are frequently in contact with the coating liquid, and wear progresses if they are made of stainless steel.

Therefore, it is preferable to use a hard material for the flow path forming members 3 and 4 . Any hard material may be used, but a high hardness hard material having a Vickers hardness of 800 Hv or more, more preferably 1200 Hv or more is preferred. By using these hard materials, it is possible to reduce wear due to high-hardness particles and fillers contained in the coating liquid. Alternatively, even if it is not a hard material, it may be surface-treated to form a hard phase represented by tungsten carbide or DLC.

Please refer to FIG. FIG. 3 is a sectional view taken along line AA of FIG. 1, showing a front view of the inside of the coating head.

The lip member 1 has a non-wetted surface 1 b that is in close contact with the lip member 2 . The flow path forming member 3 attached to the lip member 1 has a non-liquid contact surface 3 b that is in close contact with the flow path forming member 4 and a liquid contact surface 3 a that forms the slit 6 together with the flow path forming member 4 . There is a step between the liquid contact surface 3a and the non-contact liquid surface 3b. A slit 6 having a gap amount t in the X-axis direction is formed.

The lip member 1 and the flow path forming member 3 are manufactured so that the non-wetted surface 3b and the non-wetted surface 1b are substantially flush. Although not shown, the lip member 2 and the flow path forming member 4 are also manufactured so that their non-liquid contact surfaces are approximately the same surface. Therefore, by combining the opposing lip members 1 and 2 by bolting, substantially the same surfaces are brought into contact with each other and sealed.

In this way, the coating liquid 10 flows only through the slit 6 formed by the liquid contact surface 3a. Therefore, even if the flow path forming member 3 wears due to contact with the coating liquid 10, only the liquid contact surface 3a is worn. Since the non-wetted surface 3b is not worn, no step occurs between the non-wetted surface 3b and the non-wetted surface 1b, and the sealing performance of the coating head 100 can be maintained.

On the other hand, since the liquid contact surface 3a is worn by contact with the coating liquid 10, the step between the liquid contact surface 3a and the non-liquid contact surface 3b becomes large, but does not affect the sealing performance of the coating head 100. . The amount of clearance t in the X-axis direction of the slit 6 increases due to wear of the contact surface 3a. It can be smaller than the initial gap amount t. If the amount of change in the gap Δt increases extremely due to the progress of wear, the discharge uniformity of the coating head 100 is lost. It is preferable to manage Δt≦0.2t. More preferably, the gap change amount Δt is maintained at Δt≦0.1t by removing the flow path forming member 3 from the lip member 1 and attaching a new flow path forming member 3′ as the wear progresses. It's good.

Please refer to FIGS. FIG. 4 is a cross-sectional view showing a schematic configuration of a coating head 200 that is another embodiment of the invention. FIG. 5 shows a front view of the inside of the coating head taken along the line BB in FIG.

In the coating head 200, between the lip member 201 and the channel forming member 203, and between the lip member 202 and the channel forming member 204, the dimensional accuracy in the X-axis direction and the Z-axis direction can be adjusted on the order of microns. A sizing member is incorporated for Thickness adjustment members 208 and 209 are incorporated in the X-axis direction, and height adjustment members 210 and 211 are incorporated in the Z-axis direction.

When the flow path forming member 203 is removed and replaced with a new flow path forming member 203', the non-liquid contact surface 201b of the lip member 201 and the non-liquid contact surface 203'b of the flow path forming member 203' are substantially flush. Otherwise, the sealing performance of the coating head 200 may be deteriorated and the coating liquid 10 may leak from other than the ejection port 207 . Therefore, it is preferable to manufacture the flow path forming member 203' with high accuracy so as to be substantially the same as the flow path forming member 203 before replacement. required, resulting in high production costs.

Alternatively, even if high-precision machining on the order of microns is performed, since the flow path forming member 203' has low rigidity and is likely to be distorted during machining, the sealing performance of the coating head 200 may deteriorate.

Therefore, in order to make the non-liquid contact surface 201b and 203'b substantially flush without processing the flow path forming member 203' with high accuracy, the thickness adjusting member 208 is removed and a new thickness adjusting member 208' is used. preferably replaced. The dimension of the new adjustment member 208′ in the X-axis direction is adjusted with respect to the thickness adjustment member 208 by the thickness difference in the X-axis direction between the flow path forming members 203 and 203′, and is manufactured with high precision. is preferred. Since the thickness adjusting member 208(') has a simpler shape than the flow path forming member 203('), it is relatively easy to control the dimension in the X-axis direction on the order of microns, and the manufacturing cost can be reduced. Therefore, the liquid non-wetted surfaces 201b and 203'b can be substantially flush with each other.

The thickness adjusting member 208' may have any shape as long as the non-wetting surfaces 201b and 203'b can be substantially flush with each other. For example, it may be a single plate extending in the Y-axis direction, or a plurality of blocks scattered in the Y-axis direction.

The thickness adjusting member 209(') may have any shape in the lip member 202 as long as it can exhibit the same effect as the thickness adjusting member 208(').

Any material can be used for the thickness adjusting members 208(′) and 209(′) as long as it can be processed on the micron order, but stainless steel, which is excellent in workability and chemical resistance, is more preferable. Steel.

In addition, even if the flow path forming member 203 is replaced with the flow path forming member 203' and the flow path forming member 204 is replaced with the flow path forming member 204', the position of the discharge port 207 in the Z-axis direction can be substantially the same. Preferably, height adjustment member 210 is replaced with a new height adjustment member 210' and height adjustment member 211 is replaced with a new height adjustment member 211'. The new height adjusting member 210′ has dimensions adjusted with respect to the height adjusting member 210 by the height difference in the Z-axis direction between the flow path forming member 203 and the flow path forming member 203′. 211′ has dimensions adjusted with respect to the height adjustment member 211 by the height difference in the Z-axis direction between the flow path forming member 204 and the flow path forming member 204′, and is manufactured with high precision. preferable. The height adjustment members 210(') and 211(') have simpler shapes than the flow path forming members 203(') and 204('), so the dimensions in the Z-axis direction can be controlled on the order of microns. is relatively easy, the manufacturing cost can be suppressed, and the positions of the discharge ports 207 in the Z-axis direction can be substantially the same. Since the positions of the ejection ports 207 are substantially the same, the close distance between the ejection ports 207 and the member to be coated (not shown) is kept substantially constant, so readjustment of the coating equipment is minimized. It is preferable because it can be

The height adjustment members 210(′) and 211(′) may have any shape as long as the dimension in the Z-axis direction can be controlled with high precision. It may be a plurality of blocks scattered in the axial direction.

The height adjustment members 210(') and 211(') may be made of any material as long as it can be processed on the order of microns, but preferably has excellent workability and chemical resistance. Stainless steel.

Please refer to FIG. The coating head of the present invention is not limited to the above embodiment, and as shown in FIG. A configuration in which a slit of the amount t is formed may be used.

By changing the thickness and shape of the shim 320, it is possible to change the gap amount t of the slit and change the length of the opening of the discharge port 307 (not shown) in the Y-axis direction. It is more preferably used for coating liquids and coating heads corresponding to product widths.

As described above, if the coating head of the present invention is used, it is possible to increase the hardness of the part through which the coating liquid passes and improve the abrasion resistance without causing poor coating appearance due to wear. stable coating becomes possible.

1, 2 Lip members 3('), 4 Flow path forming member 5 Manifolds 5a, 5b Recess 6 Slit 7 Discharge port 10 Coating liquid 100 Coating head 200 Coating heads 201, 202 Lip members 203('), 204( ') Flow path forming member 205 Manifold 205a, 205b Recess 206 Slit 207 Discharge port 208('), 209(') Thickness adjusting member 210('), 211(') Height adjusting member 300 Coating heads 301, 302 Lip Members 303, 304 Flow path forming member 305 Manifolds 305a, 305b Recess 320 Shims 3a, 203(')a Liquid contact surfaces 1b, 3b, 201b, 203b Non-contact liquid surface t Gap amount Δt Gap change amount

Claims (3)

A coating head in which two lip members are assembled directly or via another member,
Between the two lip members, a manifold for expanding the width of the coating liquid in the longitudinal direction of the coating head, and a discharger extending in the longitudinal direction of the coating head for discharging the coating liquid from the coating head. having an outlet and a slit communicating between the manifold and the outlet;
Flow path forming members made of a material having a Vickers hardness of 800 Hv or more are detachably attached to each of the two lip members so as to face each other,
The flow path forming member attached to at least one of the two lip members is formed with a recess forming the manifold together with the flow path forming member attached to the other lip member. ,
Between the two flow path forming members, there is a gap extending from the manifold portion to the outside of the coating head, and this gap constitutes the slit and the ejection port.
coating head. A coating head in which two lip members are assembled directly or via another member,
Between the two lip members, a manifold for expanding the width of the coating liquid in the longitudinal direction of the coating head, and a discharger extending in the longitudinal direction of the coating head for discharging the coating liquid from the coating head. having an outlet and a slit communicating between the manifold and the outlet;
Flow path forming members surface-treated with tungsten carbide or DLC are detachably attached to each of the two lip members so as to face each other,
The flow path forming member attached to at least one of the two lip members is formed with a recess forming the manifold together with the flow path forming member attached to the other lip member. ,
Between the two flow path forming members, there is a gap extending from the manifold portion to the outside of the coating head, and this gap constitutes the slit and the ejection port.
coating head. With the opposing direction of the flow path forming members as the thickness direction, the mounting position of the flow path forming member with respect to the lip member in the thickness direction is between the lip member and the flow path forming member attached to the lip member. 3. A coating head according to claim 1 or 2 , having a sizing member made of stainless steel for adjustment.

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