JPH0716524A - Coating device and paint feed device - Google Patents

Abstract

PURPOSE:To provide a coating device which solves a trouble of unnecessary application of a paint to an uncoated part and, at the same time, eliminates the irregularity of a coated edge generating at the point of time when a paint is applied to or an image is transferred to a support. CONSTITUTION:This coating device consists of a pressing roll 2 for bracing a support 1, a device 3 for feeding paint to the support 1, a bar head 4 for scraping of an excess paint, and a roll 5 for transporting the support. In addition, the coating device has a tubular paint feeder 3 with a slit-like nozzle provided in the surface longitudinal direction of the tubular body. Further, the nozzle part is composed of an outer pipe with at least one shim and an inner pipe with an opening inside the outer pipe. Paint is supplied to the inner pipe, discharged from a space between the shims and is applied to the surface of the support to be transported and an excess paint is scraped off, using the bar head 4 to form a coat in a striped pattern.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an adhesive, pressure-sensitive adhesive, paint, etc. (hereinafter, paint) on the surface of a flexible support (hereinafter, simply "support") such as plastic film, paper and metal foil. TECHNICAL FIELD The present invention relates to a coating device for applying a stripe shape and a device for supplying a paint or the like.

[0002]

2. Description of the Related Art Conventionally, a reverse roll type coating apparatus has been known as a coating apparatus for coating a surface of a continuously conveyed substrate with a coating material to form a stripe pattern.
It is known from Japanese Patent No. 3746. Hereinafter, the conventional reverse roll type coating apparatus will be described with reference to the drawings.

In FIG. 6, a is a support, b is paint, etc.
c is a backup roll, d is an uncoated portion forming blade,
e is an applicator roll, f is a metering roll, g
Is a doctor. The arrow in the figure indicates the direction of rotation of each roll. 7A is a plan view showing a state in which the coating material or the like is applied in stripes on the surface of the support in the application direction j in the apparatus shown in FIG. 6, and FIG. Q
It is a sectional view taken along the line Q '.

In the reverse roll type coating apparatus constructed as described above, first, the support a to be coated is wound around the backup roll c and conveyed. The coating material b is scraped up by the applicator roll e, and the coating thickness is determined by the gap between the applicator roll e and the metering roll f.
Is scraped off by doctor g. The coating material b on the applicator roll e is uncoated part h as shown in FIGS. 7 (A) and 7 (B) by the uncoated part forming blades d which are provided in plural in the plane length direction of the applicator roll e. Are formed and are provided in a stripe shape. Next, the coating material b is transferred in stripes to the support a by nipping it to the backup roll c to form the stripe coating part i.

[0005]

The above-described conventionally known coating apparatus of the reverse roll system has the following technical problems. That is, when the coating material b having a constant coating thickness due to the gap between the applicator roll e and the metering roll f forms the uncoated portion h by the uncoated portion forming blade d (the striped coating portion is formed. When a coating material containing a hard pigment such as a magnetic coating material is used, an uncoated portion forming blade d
However, there is a problem that the paint or the like is applied to the unapplied portion h with the lapse of time.

Further, when the coating material b of the striped coating portion i formed by the uncoated portion forming blade d is transferred from the applicator roll e to the surface of the support a, the coating edge is disturbed and the sharpness is deteriorated. There was a problem.

Therefore, the object of the present invention is to improve the problem that the coating material is applied to the uncoated portion due to the abrasion of the blade d for forming the uncoated portion and to occur at the time of coating or transferring to the support. Another object of the present invention is to provide a coating device for coating a coating material or the like in a stripe shape so as to improve the disorder of the coating edge.

[0008]

In order to achieve the above object, a coating apparatus, which is a feature of the present invention, has the following configuration. That is, the present invention is a coating apparatus having a pressing roll that supports a support, a device that supplies paint to the support, a bar head that scrapes off excess paint and the like, and a roll that conveys the support. The apparatus for supplying the coating material or the like forms a tubular body, and a slit-shaped nozzle is provided in the surface length direction of the tubular body, and an outer tube provided with one or more shims in the nozzle portion and the outer tube. An inner pipe having an opening is provided inside the pipe, the paint or the like is supplied to the inner pipe, the paint or the like is discharged from between the shims, and the paint or the like is applied to the surface of the support to be conveyed. The coating device is characterized by scraping off excess paint and the like with a head and applying it in stripes. Further, according to the present invention, an outer pipe having a slit-shaped nozzle provided in a surface length direction of a tubular body and having at least one shim provided in the nozzle portion, and an inner pipe having an opening inside the outer pipe are arranged. A device for supplying paint or the like, which is characterized in that the paint or the like is supplied to the inner pipe and the paint or the like is discharged from between the shims.

[0009]

In the present invention, since the device for supplying paint and the like has a double structure consisting of the outer pipe and the inner pipe, the paint or the like is rectified while flowing out from the inner pipe to the outer pipe. The pressure and supply amount of the stripe-shaped paint or the like discharged from the nozzle are substantially constant over the entire surface length direction. Therefore, the excess paint scraped off by the bar head can be minimized, the paint spreads less by the bar head, and the coating can be applied to the support without disturbing the coating edge. Further, since the measurement is performed by the bar head, the coating thickness of all stripes is formed uniformly.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view of a coating apparatus showing an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of an apparatus for supplying paint and the like, and FIG.
2 is a cross-sectional view of an apparatus for supplying paint or the like as seen from X to X'in FIG. 1, and FIG. 4 is a plan view showing a nozzle and a mounting portion of a shim in the apparatus for supplying paint or the like of FIG.

With reference to FIGS. 1 to 4, first, the present coating apparatus comprises a pressing roll 2 for supporting the support 1, and a device 3 for supplying paint or the like to the support 1 arranged under the pressing roll 2. And a bar head 4 for scraping off excess paint and the like, and a roll 5 for transporting the support 1. The device 3 for supplying the paint or the like has a double-structured tubular body as shown in FIGS. An outer tube 7 provided with a slit-shaped nozzle 6 and an inner tube 8 having an opening inside the outer tube 7 are arranged in the surface length direction of the tubular body. The paint or the like is supplied to the inner pipe 8 from the Y direction, the paint or the like is discharged from the nozzle 6, and the paint or the like that has not been discharged is discharged from the Z direction and is circulated.

Here, the nozzle 6 and the outer tube 7 are fixed by screws 9. A slit adjusting plate 10 for rectifying the flow of paint or the like is attached to one of the ends of the opening of the inner pipe 8. Further, the outer tube 7 and the inner tube 8 are not limited to the cylindrical shape as shown in FIGS. 2 to 4, but may have any shape such as a triangular prism or a quadrangular prism, and a plurality of inner tubes 8 may be provided. Further, the nozzle 6 may be integrally formed with the outer tube 7. Further, the distance G between the support 1 on the surface of the pressing roll 2 and the tip of the nozzle 6 is 200 μm in order to apply the paint or the like to the support 1 in the rectified state.
It is preferably set to ˜500 μm.

The paint or the like discharged from the nozzle 6 is
One or more shims 1 inserted into the nozzle portion shown in FIG.
By means of 1, the ink is ejected from the nozzle 6 to form a stripe shape and is applied and applied to the support 1. In this way, the striped coated support 1 passes through the bar head 4 to scrape off the excess coating material and the like on the striped coated surface to adjust the coating amount and to adjust the support to an appropriate amount. Applied to the surface.

The bar head 4 is usually rotated and used, but it is preferable to use it in a stopped state in order to reduce the disturbance of the coating edge. For this reason, it is preferable to use stainless wire wound or chrome plated. still,
The shim 11 provided for applying in a stripe shape may be provided with one or more shims in the nozzle 6 as shown in FIG. 5A, or as shown in FIG. The nozzle 6 may be provided with a fixed one processed. Further, the nozzle 6 may be provided with a shim as an integral molding.

The dimension W (thickness of shim) in FIG. 5 is preferably about 1 to 3 mm in order to maintain the sharpness of the stripe, and W'is set to about 1 mm in terms of dimension and processing accuracy. Although preferred, it is not limited thereto. Further, the dimension H is preferably set to be slightly narrower than the stripe width in consideration of the viscosity of the paint or the like and the slight spread by the bar head, and the dimension L is arbitrarily determined by the coating pitch. Further, the material of the shim is preferably made of plastic such as polytetrafluoroethylene in order to protect the nozzle and maintain the adhesiveness,
It may be made of metal such as stainless steel.

[0016]

According to the coating apparatus and the apparatus for supplying paint etc. of the present invention, the following effects can be obtained. Unlike the conventional case, since there is no blade for forming a stripe shape, there is no problem that paint or the like is applied to an uncoated portion due to abrasion of the blade. In addition, since the device for supplying paint and the like has a double structure consisting of an outer pipe and an inner pipe, it is rectified while the paint and the like flows from the inner pipe to the outer pipe, and is discharged from the nozzle in a stripe shape. Since the pressure and supply of the paint, etc. are almost constant over the entire surface length direction and the bar head is used for weighing, the coating thickness of all stripes is formed uniformly, and the irregularity of the coating edge can be reduced, and the quality is improved. improves.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a coating apparatus of the present invention.

FIG. 2 is an enlarged cross-sectional view of an apparatus for supplying paint and the like.

3 is a cross-sectional view of an apparatus for supplying paint and the like as viewed from X to X'in FIG.

FIG. 4 is a plan view showing a mounting portion of a nozzle and a shim.

FIG. 5 is a diagram showing a form of a shim.

FIG. 6 is a schematic view of a conventional device for applying a striped pattern.

FIG. 7 is a diagram showing a state in which the support is applied in a stripe shape.

[Explanation of symbols]

 1 Support 2 Pressing Roll 3 Device for Supplying Paint 4 Bar Head 5 Roll for Transporting Support 6 Nozzle 7 Outer Tube 8 Inner Tube 9 Screw 10 Slit Adjustment Plate 11 Shim

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takahiro Mori 3-1, Somoe-cho, Shizuoka-shi, Shizuoka Prefecture Tomagawa Paper Mill Technical Research Institute (72) Takao Kaneko 3 Soba-machi, Shizuoka-shi, Shizuoka Prefecture No. 1 Inside the Tagawagawa Paper Mill Technical Research Institute

Claims (2)

[Claims] 1. A pressing roll for supporting a support,
What is claimed is: 1. A coating device comprising: a device for supplying paint or the like to the support, a bar head for scraping off excess paint or the like, and a roll for transporting the support, wherein the device for supplying the paint or the like is a tubular body. A slit-shaped nozzle is provided in the surface length direction of the tubular body, and an outer tube having one or more shims provided at the nozzle portion and an inner tube having an opening inside the outer tube are provided. Then, the paint or the like is supplied to the inner pipe, the paint or the like is discharged from between the shims, the paint or the like is applied to the surface of the substrate to be conveyed, and the excess paint or the like is scraped off and applied by the bar head. Characteristic coating device. 2. An outer pipe provided with a slit-shaped nozzle in the surface length direction of a tubular body and having one or more shims in the nozzle portion, and an inner pipe having an opening inside the outer pipe. A device for supplying paint or the like, which is provided to supply paint or the like to the inner pipe and discharge the paint or the like from between the shims.