JP2777764B2 - Slant coating method for paint etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive, a pressure-sensitive adhesive, a paint, etc. on a flexible support (hereinafter simply referred to as a support) such as a plastic film, paper, metal foil or the like which is continuously conveyed. The present invention relates to a coating method for applying a coating material (hereinafter, referred to as a paint), and more particularly, to an oblique coating method in which coating layers having different coating thicknesses are formed in the width direction of the support.

[0002]

2. Description of the Related Art In a normal coating method, it is common to apply a paint or the like having a constant coating thickness on a support. On the other hand, a coating layer having a different coating thickness in the width direction of the support (for example, , Stepwise or sawtooth shape) is also known.

Conventionally, when performing stepwise inclined coating (printing or coating) using a gravure printing, screen printing, offset printing machine, or the like, a method shown in FIGS. 5 and 6 is used, for example.

That is, FIG. 5 is a partial cross-sectional view showing a support in a finished state of the oblique coating, in which a large number of step-like coating layers 2 are formed in the width direction of the surface of the support 1. Coating layer 2
In this embodiment, the support 1 has a lower layer h1, an intermediate layer h2, and an upper layer h3.
Are formed on the surface. The coating layer having such a fixed pattern can be obtained by sequentially applying using a plate (or a roll) having a different pattern formation as shown in FIG.

[0005] Fig. 6 shows a plate pattern shape when coating is performed using a gravure roll. Fig. 6 (a) shows a solid layer 3a for a lower layer for forming a lower layer h1, and Fig. 6 (b). 3 shows a solid plate 3b for forming the middle layer h2, and FIG. 7C shows a solid plate 3c for forming the upper layer h3. By sequentially applying a paint or the like on the support 1 using the solid printing plates 3a, 3b, and 3c having different patterns as described above, the steps shown by the lower layer h1, the middle layer h2, and the upper layer h3 as shown in FIG. The coating layer 2 having a shape can be formed.

[0006] In the case of screen printing, which is another coating method , only the stencil used is a stencil, and the inclined coating can be obtained by sequentially printing in the same manner as described above. In the case of offset printing, only the printing plate used is a lithographic printing plate, and the inclined coating can be obtained by sequentially printing in the same manner. On the other hand, there is also known an apparatus in which an adhesive tape is stuck at intervals on the surface of a comma roll provided opposite to a coater roll, and a support or the like is coated with a paint or the like in a stripe shape. (JP-A-63-1
No. 47575)

[0007]

The oblique coating method of sequentially applying a large number of solid printing plates 3a, 3b, 3c (other rolls or the like) having different plate patterns as described above has the following technical problems. there were.

First, a large number of solid printing plates 3 having different printing plate patterns
a, 3b, 3c (other rolls, etc.)
The coating apparatus becomes complicated and costly. In addition, since it is necessary to adjust the position of each solid plate 3a, 3b, 3c and apply it in multiple layers, it is difficult to adjust the position and it takes time and effort. In addition, it takes time and effort to exchange each plate. It was such a thing. In addition, since the method of transferring the coating layer on the support 1 is performed by using a plate, there is a limit to the coating thickness of each layer, and depending on the required coating thickness, it is difficult to perform coating multiple times using the same printing plate. turn into. Therefore, it takes more time and effort. Furthermore, shapes other than the step shape, for example, sawtooth shape, wavy shape,
It is almost impossible to form a coating surface such as a concavo-convex arc shape.
Furthermore, when changing the paint or the like, a large number of solid plates 3a, 3b, 3c (other rolls, etc.) having different plate patterns must be washed, so that the stopping time of the apparatus based on the washing operation is prolonged, and the coating is performed. The operating efficiency and productivity of the equipment decrease. On the other hand, in the stripe-shaped coating apparatus disclosed in JP-A-63-147575, there is a possibility that the adhesive tape may be peeled off, resulting in deterioration in quality or coating failure, and further, the adhesive tape may be peeled off. In such a case, the coating device must be temporarily stopped in order to reattach the adhesive tape, so that there is a possibility that the productivity of coating may be reduced. Further, the thickness of the pressure-sensitive adhesive tape composed of the film and the pressure-sensitive adhesive layer is unlikely to be uniform over the entire surface, so that the thickness of the applied coating film is not uniform and precise coating is difficult. Was. In addition, saw-toothed, wavy, uneven arc-shaped
It is difficult to make a groove with a complicated shape.
With the known adhesive tape method, the application surface of complicated shape
It is almost impossible to form one step and one layer .

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and it is possible to form a step-shaped or saw-tooth-shaped complex coated surface in one step and one layer , and It is an object of the present invention to provide an inclined coating method which enables formation of a coating surface with a high coating thickness accuracy.

[0010]

Means for Solving the Problems In order to achieve the above object, a method for applying a paint or the like according to the present invention has the following configuration.

That is, a stationary member, a rotating roll opposed to the stationary member with a gap therebetween, and a dam provided on the upper or side of the stationary member and the rotating roll for storing paint or the like are formed. And a support that is wound around the rotating rolls, immersed in the dam, and continuously conveyed, and is coated with a paint or the like obtained by applying the paint or the like in the dam onto the support. In the method , the rotation of the fixing member
Integrally formed on the surface of the fixing member on the part facing the roll
Predetermined length extending in the transport direction of the support by the groove formed
Formed on the support by the fixing member.
It is characterized by applying paint etc. in one process and one layer
Inclined coating method for paints, etc. In addition, the concave and convex strips have a step-like, saw-tooth, wavy, concave and convex arc shape or the like in the width direction. Furthermore, the fixing member is a member having an arc surface at a portion facing the rotating roll. Further, the fixing member is a fixing roll. Furthermore, the fixing member is a member having a straight surface in a portion facing the rotating roll.

In the present invention, the support is a coated paper,
A generic term for a flexible support such as a coated film or a metal foil, or a continuously transported flexible sheet-like strip or web.

[0013]

In the present invention, when the support is transported while being immersed in the paint or the like inside the dam and is sandwiched between the fixed roll and the rotating roll and sent out to the outside, the form of the fixed roll is applied to the support. Because of the transfer, various patterns can be applied in one step and one layer.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. The present applicant has already proposed a dam-type coating device for coating a paint or the like in which the support is directly immersed in the paint or the like in the dam and transported. (Japanese Patent Application No. 4-125479) Since the present invention utilizes the above-mentioned dam type coating apparatus for the inclined coating method , the dam type coating apparatus already proposed will be described below. Put.

Referring to FIG. 4, a rotating roll 22 is provided opposite to the fixed roll 21, and a dam 24 having a contact portion 23 between the fixed roll 21 and the rotating roll 22 as a bottom is divided into two sections.
5 and are formed. A paint or the like (paint, adhesive, adhesive, etc.) is supplied to the dam 24 and stored in a predetermined amount. The rotating roll 22 is used for the continuously running support 2.
The support 26 is guided into the dam 24 through a gap between the rotating roll 22 and one of the partitions 25, and is immersed in paint or the like in the dam 24. After that, it goes out through the gap between the fixed roll 21 and the rotating roll 22. Since the support 26 passes through the gap between the fixed roll 21 and the rotating roll 22, the size of the gap H between the support 26 and the fixed roll 21 determines the amount of paint or the like transferred to the support 26. It is to be weighed.

The above-described dam type coating device for coating paint or the like can be applied to the coating of various paints and the like, and the present applicant has filed many applications for the invention so far. The present invention is one of such applied inventions.

FIG. 1 is a schematic perspective view showing an outline of an inclined coating apparatus according to an embodiment of the present invention. Referring to FIG. 1, a rotating roll 32 is provided opposite to a fixed roll 31, and a dam 34 having a bottom at a contact portion 33 between the fixed roll 31 and the rotating roll 32 is formed by being surrounded by a partition 35. A paint or the like (paint, adhesive, adhesive, etc.) is supplied to the dam 34 and stored in a predetermined amount. The rotary roll 32 guides the continuously running support 36 by winding it at a predetermined angle, and the support 36 is introduced into the dam 34 through a gap between the rotary roll 32 and one of the compartments 35. After being immersed in the paint or the like in the dam 34, the fixed roll 3
It goes out through the gap between 1 and the rotating roll 32. Since the support 36 passes through the gap between the fixed roll 31 and the rotating roll 32, the size of the gap H (see FIG. 2) between the support 36 and the fixed roll 31
6 is to measure the amount of paint or the like to be transferred to 6.

The above construction is the same as that of the coating apparatus for dam-type paint or the like of the already-filed application shown in FIG. 4, but in the present invention, a support 36 is provided at a portion where the fixed roll 31 and the rotating roll 32 face each other. An uneven strip 37 having a predetermined length extending in the transport direction is provided by a groove integrally formed on the surface of the fixed roll 31. An example of the ridges 37 will be described with reference to FIG.

FIG. 2 (a) shows a step-like uneven strip 37a, which is formed in two steps in this embodiment. However, the present invention is not limited to two steps, and is optional. Can be adopted. In this case,
Since the coating layer is also formed on the gap H between the surface of the support 36 wound around the rotating roll 32 and the outermost peripheral surface 31a of the fixed roll 31, the coating layer itself has three steps. The stair heights A1 and A2 and the stair widths Da1 and Da2 can be appropriately adopted. The unevenness 37a is formed in a large number in the width direction of the support 36 (the width direction of the fixed roll 31), but the present invention may be any number of one or more, and the number is not limited. .

FIG. 2B shows a saw-toothed uneven strip 37b. In this case, the surface of the support 36 wound around the rotating roll 32 and the outermost peripheral surface 31 of the fixed roll 31 are also shown.
Since the coating layer is also formed in the gap H with respect to “a”, the coating layer has two layers, ie, a lower layer part having an equal thickness and a saw-tooth part. The depth Ab of the saw tooth and the width Db of the saw tooth are appropriately adopted. In addition, the serrations 37b may be formed on the entire surface of the support 36 in the width direction (the width direction of the fixed roll 31), or may be formed partially.

FIG. 2 (c) shows a corrugated uneven strip 37c. Also in this case, the surface of the support 36 wound around the rotating roll 32 and the outermost peripheral surface 31a of the fixed roll 31 are shown.
A coating layer is also formed in the gap H between the first and second layers. Therefore, the coating layer has two layers, that is, a lower layer portion having an equal thickness and a wavy portion. The wavelength Dc and the amplitude Ac of the wavy portion are appropriately adopted. The corrugated ridges 37c extend in the width direction of the support 36 (fixed roll 3).
1 width direction), or may be formed partially.

FIG. 2 (d) shows a concave and convex strip 37d having a concave arc shape.
In this case as well, the surface of the support 36 wound around the rotating roll 32 and the outermost peripheral surface 3 of the fixed roll 31 are also shown.
The coating layer is also formed in the gap H with 1a. Therefore, the coating layer has two layers, that is, a lower layer part having an equal thickness and a concave arc-shaped part. The pitch Dd of the arc of the concave arc portion and the diameter A of the arc
d is appropriately adopted. The concave-convex ridges 37d may be formed on the entire surface of the support 36 in the width direction (the width direction of the fixed roll 31), or may be formed partially.
In addition, a convex arc may be used instead of the concave arc, and a shape may be formed by alternately combining concave and convex arcs.

In the above description, the concavo-convex strips 37 formed on the fixed roll 31 need not cover the entire surface of the fixed roll 31 in the circumferential direction, but may be only a portion having a predetermined length forming the application surface. However, the present invention does not exclude the formation of the ridges 37 over the entire circumference. The material of the fixed roll 31 and the rotating roll 32 is not limited, but it is preferable that both are made of metal.

The oblique coating of the present invention configured as described above
The method will be described. The support 3 wound around the rotating roll 32
6 is immersed in paint or the like in the dam 34 and is continuously conveyed. Then, when being sent out through the gap H between the fixed roll 31 and the rotating roll 32, the paint or the like
Applied to the surface of In this case, the shape of the coating layer applied to the support 36 is the shape of the ridges 37 formed on the fixed roll 31.

What has been described above is one embodiment of the present invention, and the present invention is not limited to the above embodiment. For example, the one shown in FIG. 3 (a) is provided with a fixed member 31a having a partially arcuate surface instead of the fixed roll of FIG. 1, and the rotating roll is opposed to the arcuate surface of this fixed member 31a. 32a is provided, which is also included in the embodiment of the present invention. The one shown in FIG. 3B is provided with a rectangular fixing member 31b instead of the fixing roll of FIG. 1, and provided with a rotating roll 32b opposed to the vertical surface of the fixing member 31b. However, this is also one embodiment of the present invention. In the embodiment shown in FIG. 3 as well, the rotating rolls 32a and 32
An uneven strip (not shown) is formed at a portion of the fixing members 31a and 31b opposed to b.

Hereinafter, specific examples of the present invention will be described with reference to Table 1 with respect to the results of experiments conducted with the specifications thereof. In this example, a coated coating paper for printing was used as a support, and a conductive coating was applied thereon to produce a resistive coating having a gradient resistance used in a λ / 4 type electromagnetic wave absorber. Table 1
The coating conditions in Examples 1 to 3 were as follows: the diameter of the rotating roll was 200 mm, the diameter of the fixed roll was 200 mm, and the shape of the uneven strip was 40 μm in width and 100 μm (fixed roll diameter: 199.9 mm). 200 μm in width
(Fixed roll diameter: 199.8 mm) Step-shaped two-step unevenness with a depth of 199.8 mm (though the coated layer on the support surface has three steps), and the gap H between the support and the fixed roll is 30, 40, 50 μm.
m. The coating conditions of Examples 4 to 6 in Table 1 are the same as those of Examples 1 to 3, except that the shape of the ridges and valleys is an alternating repeating sawtooth shape having a depth of 200 μm at intervals of 30 mm. The coating was performed by changing the gap H between the body and the fixed roll to 30, 40, and 50 μm.

Other conditions are as follows. Thickness of support (μm) 190 Width of support (mm) 500 Solid content of conductive paint (%) 36 Concentration of carbon (%) 59 Viscosity of conductive paint (cp) 2200 Coating speed (m / min) 10 As a result of conducting an experiment under the above conditions, data as shown in Table 1 were obtained.

[0028]

[Table 1]

From Table 1, it was found that as the gap between the fixing roll and the support became wider, the coating film thickness became thicker, the sheet resistance was lower, and the variation was smaller. It was also found that the smaller the diameter of the fixed roll, that is, the wider the gap with the support, the thicker the coating thickness, the lower the sheet resistance value, and the smaller the variation. Accordingly, it can be seen that in Examples 1 to 6, a desired step-like or saw-tooth-like gradient resistance was obtained.

[0030]

According to the present invention described above, the following effects can be obtained. First, unlike the related art, it is not necessary to perform coating on the support sequentially, and depending on the form of the fixing member or the fixing roll, it is possible to form a coating surface of various complicated shapes by one.
Since this is achieved by one process and one layer , cost, time, and labor can be greatly reduced, and further, positioning work is eliminated, and productivity and workability are improved.

In addition, since the method of transferring the paint or the like to the support is a method of directly immersing the support in the paint or the like in the dam, there is no possibility that the transfer failure due to the material constituting the roll or the paint composition occurs. Is reduced.

Further, when the paint or the like is changed, only the fixing member or the fixing roll needs to be cleaned, so that the stop time of the apparatus due to the cleaning operation is reduced, and in this regard, the operation efficiency and productivity of the apparatus are improved. I do.

Further, as compared with the above-mentioned stripe-shaped coating apparatus using an adhesive tape, there is no quality deterioration or coating failure due to peeling of the adhesive tape, and the productivity of the coating apparatus is improved. Further, a coating having a uniform thickness can be obtained over the entire surface as compared with the adhesive tape, and precise coating can be performed. Furthermore, it is possible to form a coating surface having a complicated shape that cannot be obtained with an adhesive tape, that is, a saw-tooth shape, a wavy shape, an uneven arc shape, or the like.

[Brief description of the drawings]

FIG. 1 is an oblique coating method showing one embodiment of the present invention.
It is a schematic perspective view of the inclined coating device which implemented .

FIGS. 2A and 2B are cross-sectional views showing an embodiment of the uneven strip of the present invention, wherein FIG. 2A shows a step-shaped uneven strip, FIG. 2B shows a saw-tooth uneven strip, and FIG. Indicates wavy irregularities,
(D) shows a concave arc.

FIG. 3 is a schematic cross-sectional view showing a slant coating apparatus in which another dam type coating method of the present invention is applied, in which FIG. 3A is an arc instead of a fixed roll. A fixing member having a surface is used, and (b) uses a fixing member having a vertical surface instead of the fixing roll.

FIG. 4 is a schematic cross-sectional view showing an example of a coating apparatus for coating a dam type paint or the like which has already been proposed by the present applicant.

FIG. 5 is a partial cross-sectional view of a support when stepwise inclined coating is performed using a conventionally known coating method .

FIG. 6 is a cross-sectional view showing the shape of a plate roll used when performing stepwise inclined coating using a conventionally known coating method .

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 31 Fixed roll 32 Rotating roll 33 Contact part 34 Dam 35 Partition body 36 Support body 37 Irregular stripes

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshinori Takahama 3-1, Yomomoe-cho, Shizuoka-shi, Shizuoka Pref. Technical Research Laboratory of Hamakawa Paper Mill Co., Ltd. (56) References JP-A-55-94666 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B05D 1/18-1/38 B05D 5/06 B05D 5/12 B05D 7/00 B05C 3 / 00-3/20 B05C 5/00-5/04 B05C 1/00-1/16

Claims (8)

(57) [Claims] 1. A fixing member, a rotating roll opposed to the fixing member with a gap therebetween, and a dam provided on the upper or side of the fixing member and the rotating roll for storing paint or the like. And a support that is wound around the rotating rolls, immersed in the dam, and continuously conveyed, and is coated with a paint or the like obtained by applying the paint or the like in the dam onto the support. In the method , a fixing portion is provided on a portion of the fixing member facing the rotating roll.
The support is transported by a groove integrally formed on the surface of the material.
Forming a concave and convex strip of a predetermined length extending in the direction,
Therefore, a paint or the like is applied to the support in one step and one layer.
A method for obliquely coating paint or the like, characterized in that: 2. The inclined coating of a paint or the like according to claim 1, wherein the uneven strip has a step-like shape in the width direction.
How . 3. The inclined coating of a paint or the like according to claim 1, wherein the uneven strip has a saw-tooth shape in the width direction.
How . Wherein irregularities strip is inclined coating side of the paint or the like according to claim 1, characterized in that a wave-like form in the width direction
Law . 5. uneven conditions is inclined method of coating paints according to claim 1, characterized in that an uneven arcuate form in the width direction. 6. A fixing member is inclined method of coating paints according to claim 1, wherein the the rotating roll a portion facing a member having an arcuate surface. 7. The method according to claim 1, wherein the fixing member is a fixing roll. 8. A fixing member is inclined method of coating paints according to claim 1, wherein the the rotating roll a portion facing a member having a straight surface.