JPH06246216A - Paint supply equipment - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to reduce coating unevenness caused by entrainment of bubbles generated in a paint or the like, and to obtain a coated surface of excellent quality. [Structure] Nozzle 2 having a slit shape in the longitudinal direction of tubular body 1.
In the fountain type paint supply device which is provided with the nozzle 2 and discharges the paint from the nozzle 2, a paint supply device comprising a lip nozzle 2A and a flat nozzle 2B, which are provided so that the nozzle 2 faces each other.

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 coating liquid (hereinafter referred to as a paint, etc.) on a flexible support (hereinafter simply referred to as a support) such as a plastic film, paper, or metal foil. ) Is applied to a paint supply device.

[0002]

2. Description of the Related Art A fountain type paint supply device is known as a device for supplying paint or the like onto a support which is continuously conveyed. This fountain type paint supply device is used in various coating machines such as a roll type, a bar type, a blade type and an air knife type. For example, when used in a bar type coating machine, as shown in FIG. 5, the support b wound around the turn roll a and conveyed is two pressing rolls in a free state. A fountain manifold d having a slit-shaped fountain lip e provided on the top was provided between the two pressing rolls c, and the fountain manifold d was supplied under pressure. The paint or the like is excessively supplied from the fountain lip e to the support b, and the bar head f scrapes off the excess paint or the like to adjust the coating amount.

[0003]

The fountain type paint supply device known in the related art as described above has the following technical problems. That is, in the case of a bar type coating machine in which the coating amount is adjusted by scraping off the excess paint as described above, the excess paint is collected and circulated for use, and therefore air bubbles are present in the paint. It is easy to get caught, and when air bubbles are caught, the air bubbles are not coated and become white,
The problem of coating unevenness, so-called white spot, occurred on the coated surface of the support. In order to solve this problem, conventionally, methods such as optimizing the outer diameter of the tubular body, installing a defoaming device, and applying a filter to remove air bubbles have been performed. However, even if the above means is taken, it is not possible to completely prevent the inclusion of air bubbles, and it is impossible to completely eliminate the coating unevenness.

Therefore, it is an object of the present invention to reduce coating unevenness caused by entrainment of air bubbles in the above-mentioned paint or the like and to obtain a coating surface of excellent quality.

[0005]

In order to achieve the above object, a coating material supply device, which is a feature of the present invention, has the following configuration. That is, according to the present invention, in a fountain-type paint supply device in which a slit-shaped nozzle 2 is provided in the surface length direction of the tubular body 1 and the paint is discharged from the nozzle 2, a lip nozzle 2A provided opposite the nozzle 2 is provided. The paint supply device is characterized by comprising a flat nozzle 2B.

[0006]

In the present invention, the bubbles in the coating material supplied to the support are destroyed by the pressure generated in the narrow space between the support and the flat nozzle (hereinafter referred to as the narrow pressure phenomenon), resulting in uneven coating due to white spots. Will be reduced.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view of a paint supply device showing an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line YY of FIG. 1, and FIG. 3 is a top view of mounting a nozzle.

First, referring to FIGS. 1 and 2, a nozzle 2 is provided in a tubular body 1, a paint supply section A is provided on one side of the tubular body 1, and a paint discharge section B is provided on the other side. There is. The coating material or the like supplied from the coating material supply section A by a pump or the like (not shown) passes through the slit 3 of the tubular body 1 and is discharged from the nozzle 2. Fine adjustment of the liquid level discharged from the nozzle 2 is performed by operating the paint discharge part B.

Here, the tubular body 1 is fixed by the above-mentioned tubular body 1
The fixing rod 4 welded to the above is fixed to the fixing plate 6 provided in the paint receiving butt 5 by the nut 7. Paint supply unit A is adapted to a single tube 8 ₁ welded to the single tube 8 and the tubular body 1 which is welded to the paint receiving vat 5 is connected by a unit 9. Fixing plates 6 ₁ are welded to both ends of the lower portion of the paint receiving bat 5,
It is designed to be mounted on the rail 10 or the like. The paint discharge part B is composed of a discharge pipe 11 and a valve 12. A slit 3 and a flat portion 13 for attaching the nozzle 2 to the slit 3 are provided in the surface length direction of the tubular body 1.
The tubular body 1 and the nozzle 2 are fixed by screws 14.

The above construction is the same as that of the conventionally known fountain type paint supply device, but in the present invention, the shapes of the nozzles 2 are not the same for the left and right, and the direction of movement of the support on which the paint or the like is applied is not the same. On the other hand, the nozzle shape on the near side has a shape of a lip nozzle 2A, and the other nozzle shape has a shape of a flat nozzle 2B. As shown in FIGS. 2 and 3, the lip nozzle 2A is fixed by a screw 14 with a constant pitch, and the slit width is tapered by the elongated hole G along the surface length direction of the tubular body. You can do it. To install the flat nozzle 2B, use the spacer 1
5 and the screw 16 are fixed.

The shape of the lip nozzle 2A is such that one vertex W of the triangle has a width of 2 m in order to prevent the adherence of paint or the like to the lip nozzle portion and to facilitate the flow of the scraped paint or the like.
It has a flat part of m or less, and the angle θ of the apex of the triangle is 4
It is preferably 5 ° or less. The length of the flat portion L of the flat nozzle 2B is appropriately selected depending on the traveling speed of the support, the viscosity of the coating material, and the like, and is not particularly limited. There are two conditions under which the bubbles can be effectively destroyed by the narrow pressure phenomenon with the nozzle 2B and no paint dust or the like adheres to the nozzle.
It was around 0 mm. Furthermore, the flat portion of the flat nozzle 2B that is in contact with the support is not limited to one that is parallel to the support, and the support of the flat portion that is located on the front side with respect to the traveling direction of the support and the flat nozzle 2B. It may be tapered so that the distance between the two becomes wider.

Further, the interval H between the upper ends of the lip nozzle 2A and the flat nozzle 2B is provided so that the bubbles can be effectively destroyed by the narrow pressure phenomenon between the support and the flat nozzle 2B as described above. The distance H is preferably about 2 mm.

It is preferable that all of the above parts are made of stainless steel in consideration of strength, corrosion, cleanability and the like. In addition, the support body advances from the lip nozzle side to the flat nozzle side.

What has been described above is one embodiment of the present invention, and the present invention is not limited to the above embodiment. That is, as the material used for the device, in addition to the above stainless steel, various resin pipes such as polypropylene, vinyl chloride, epoxy, and phenol, and various metal materials such as cast iron, aluminum, nickel, and copper pipe are used. be able to. Further, the tube diameter of the tubular body as a main member constituting the present apparatus is preferably about 2 inches, but these dimensions are appropriately selected depending on the viscosity of the coating material, the coating speed, the coating thickness and the like. is there

Furthermore, the present invention is to be used in a fountain type paint supply device, in which a narrow pressure phenomenon is generated by using a nozzle structure having a flat surface in contact with a support, such as a tubular body. Other structures are not limited in any way. For example, the paint supply device of FIG. 4 is the invention according to claim 2 of the present invention, and the configuration is such that the tubular body has an outer tube 21 provided with slit-shaped lip nozzles 2A and flat nozzles 2B in the surface length direction. And an inner tube 22 having an opening 23 inside the outer tube 21 is provided, the paint is supplied to the inner tube 22, the paint is discharged from the nozzle of the outer tube 21, and the paint is supplied to the support. It is a structure that does. The double structure of such a tubular body can supply the paint with a uniform pressure on the surface of the support, so that the generation of air bubbles is reduced and the narrow pressure phenomenon by the flat nozzle causes a synergistic effect. Particularly preferred.

[0016]

According to the coating material supply device of the present invention, since the bubbles in the coating material are destroyed immediately after being supplied to the support, uneven coating due to white spots due to the inclusion of bubbles as in the past is reduced. The quality of the coated surface coated on the support is improved.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a paint supply device of the present invention.

FIG. 2 is a sectional view taken along line Y-Y of FIG.

FIG. 3 is a top view of mounting the nozzle.

FIG. 4 is a cross-sectional view showing another paint supply device of the present invention.

FIG. 5 is a view showing a coating state of a conventional fountain type paint supply device.

[Explanation of symbols]

1 Tubular Body 2 Nozzle 2A Lip Nozzle 2B Flat Nozzle 3 Slit 4 Fixing Rod 5 Paint Receiving Vat 6 Fixing Plate 6 ₁ Fixing Plate 7 Nut 8 Single Pipe 8 ₁ Single Pipe 9 Unit 10 Rail 11 Discharge Pipe 12 Valve 13 Flat Part 14 screw 15 spacer 16 screw 21 outer pipe 22 inner pipe 23 opening

Claims (2)

[Claims] 1. A fountain-type coating material supply device in which a slit-shaped nozzle 2 is provided in a surface length direction of a tubular body 1 and the coating material is discharged from the nozzle 2, and a lip nozzle 2A is provided so that the nozzle 2 faces each other. A paint supply device comprising a flat nozzle 2B. 2. A tubular body 1 is provided with an outer pipe 21 having a slit-shaped nozzle 2 in the surface length direction, and an inner pipe 22 having an opening 23 inside the outer pipe 21. The paint supply device according to claim 1, wherein the paint is supplied to the inner pipe (22) and the paint is discharged from the nozzle (2) of the outer pipe (21) to supply the paint to the support.