JPH04108561A - Coating machine - Google Patents

Abstract

PURPOSE:To prevent the stagnation of coating material, to sufficiently break floc and to certainly obtain a homogenous and stable coating surface by constituting a coating machine so that ultrasonic vibration is directly applied to coating material prior to extruding the material. CONSTITUTION:A die 4 constituted by providing a buffer part 4A filled with the coating material supplied from a coating material supply source under pressure and a slot part 4B communicating with buffer part 4A at one end part thereof and opened at the other end part thereof as an extrusion port 4b extruding the coating material to an object to be coated is provided. An ultrasonic vibration applying means 12 applying ultrasonic vibration to said coating material before the material supplied to the buffer part 4B is extruded from the extrusion port 4b is provided. As a result, the stagnation of the coating material can be prevented and floc can be sufficiently broken and a homogenous and stable coating surface can be certainly obtained and the damage of the object to be coated is prevented and the quality of a product can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a coating machine (coater), and particularly to a technique for improving the coating properties of an extrusion type coater.

<Prior Art> Conventionally, as one of the many coating machines, as shown in Fig. 5, a web (for example,
PET (polyethylene terephthalate film) 2
An extrusion type coater (die coater) is known that applies a paint to one surface of the web 2 by extruding it toward the web 2.

The die 1 has a buffer part IA in its main body filled with paint supplied via a pump from a paint supply source such as a tank, and one end communicating with the buffer part IA and the other end connected to the web 2. A slot portion IB opens as an extrusion port 1b for extruding the paint toward.

By the way, in such a die coater, after the paint is applied to the web 2, the ultrasonic vibration element 3 applies vibration from the back side (non-applied surface) of the web to destroy aggregates in the paint. , to obtain a homogeneous coated surface.

<Problems to be Solved by the Invention> However, the conventional die coater using ultrasonic vibration as described above has the following problems.

That is, since the ultrasonic vibration element 3 is brought into direct contact with the web 2 such as a PET film and vibrations are applied to the paint via the web 2, ultrasonic vibrations are not directly applied to the paint. , the destruction of aggregates is not sufficient,
This configuration had some problems in obtaining a homogeneous coated surface. Another disadvantage is that the ultrasonic vibrating element 3 causes damage such as scratches on the web 2, resulting in fatal damage to the quality of the product.

In view of the above conventional problems, the present invention has a structure in which ultrasonic vibrations are applied directly to the paint before it is extruded, thereby preventing the paint from stagnation and preventing the destruction of aggregates. To provide a coating machine that can perform sufficient coating, reliably obtain a homogeneous and stable coated surface, prevent damage to objects to be coated, and improve the quality of products.

<Means for Solving the Problems> For this reason, the present invention provides a buffer portion filled with paint fed under pressure from a paint supply source, and a buffer portion that is connected to the buffer portion at one end and directed toward the object to be coated. It has a die configured with a slot/y upper part that opens as an extrusion port for extruding the paint, and the paint is supplied to the sofa section and is extruded from the extrusion port. The configuration includes an ultrasonic vibration applying means for applying sonic vibrations.

Function> In the above configuration, the paint from the paint supply source is pumped to the die. The paint that is force-fed to the die passes through the bath section and is pushed through the slot section onto the object to be coated. The object to be coated is, for example, moving, and the extruded paint is sequentially applied to its surface.

Here, ultrasonic vibrations are directly applied to the paint by the ultrasonic vibration element.

In this way, by applying ultrasonic vibration directly to the paint, it is possible to prevent the paint from stagnation in the buffer section or slot section, to make the paint homogeneous, and to prevent the destruction of aggregates in the paint. Embodiment: An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of an extrusion type coater (die coater) that extrudes paint from a die 4 toward a belt-shaped web 5 to be coated, and applies the paint to one surface of the web 5. It shows.

That is, in the figure, for example, magnetic paint is stored in a tank 6 serving as a paint supply source. The bottom of the tank 6 and the die 4 are connected via an introduction pipe 7, and the introduction pipe 7 includes:
A pump 8 and a filter 9 are interposed.

On the other hand, as shown in FIGS. 2, 3, and 4, the die 4 has a buffer section 4A filled with paint pumped from the tank 6 via a pump 8, and one end of which is connected to the buffer section 4A. The main body 4C includes a slot portion 4B that communicates with the portion 4A and has the other end opened as an extrusion port 4b for extruding the paint toward the web 5.

Here, the die main body 4C is formed in a substantially rectangular shape, and a substantially rectangular hollow portion is formed inside as a buffer portion 4A. Further, the front upper edge of this buffer portion 4A is opened in the lateral direction, and the die body 4C is opened from this opening.
Extrusion port 4 extending horizontally in the front and having a slit-like opening
A substantially plate-shaped cavity formed so as to connect the slots 4B and 4B is formed as a slot portion 4B. In this example, the die body 4C
In the above example, the front surface is tapered so that the upper and lower parts are inclined in opposite directions with the opening of the extrusion port 4b as the boundary.
Formation of this tapered surface is not a limiting requirement. The introduction pipe 7 is connected to the buffer section 4A of the die body 4C.
It passes through the rear surface of C and is connected for communication.

Incidentally, the main body 4C of the die 4 having such a configuration has a width of 200 mm, a height of 60 mm, a depth of 70 mm, and a weight of approximately 3 kg.
, SUS, and the like, and in particular, the part forming the extrusion port 4b is made of super steel. Further, the extrusion rate of the paint is 50 to 150 cc/min.

The die 4 having the above configuration is disposed in an open position between the rolls 10.11 on the conveyance path of the web 5 conveyed along a pair of rolls 10.11 disposed apart from each other, and the die 4 is disposed at an open position between the rolls 10.11 and the extrusion port 4b. It is pressed against one side of the web 5.

Here, in the present invention, an ultrasonic vibration applying means is provided for applying ultrasonic vibration to the paint from when the paint is supplied to the buffer section 4A until it is extruded from the extrusion port 4b.

In this case, as shown in FIG. 3, a rod-shaped ultrasonic vibration element 12 as an ultrasonic vibration imparting means is arranged inside the buffer section 4A.

Alternatively, as shown in FIG. 4, a plate-shaped ultrasonic vibration element 13 is built into the die body 4C below the slot portion 4B forming position, and one plane of the element 13 is aligned with the slot portion 4B.
so that it forms part of the wall that makes up the wall.

In this configuration, the paint in the tank 6 is pumped to the die 4 by driving the pump 8. The paint force-fed to the die 4 passes through the buffer section 4A and from the slot section 4B to the web 5.
is pushed out. The web 5 is run by rolls 10.11, the surface of which is successively coated with extruded paint.

In the embodiment shown in FIG. 3, the ultrasonic vibration elements 12 and 13 are applied to the paint inside the buffer part 4A, and in the embodiment shown in FIG. 4, the paint passing through the slot part 4B.
Ultrasonic vibrations are directly applied.

In this way, by directly applying ultrasonic vibration to the paint between the time when the paint is supplied to the buffer part 4A and before it is extruded from the extrusion port 4b, the paint can be absorbed in the buffer part 4A or in the slot part 4B. stagnation is prevented, the paint can be made homogeneous, and aggregates in the paint can be effectively destroyed within the buffer section 4A or the slot section 4B.

Therefore, coating unevenness in the width direction of the die 4 and coating unevenness such as streaks due to aggregates can be reduced, and a more homogeneous and stable coated surface can be obtained.

Moreover, the web 5 is not damaged by scratches or the like due to the ultrasonic vibration elements 12, 13, and the quality of the product can be improved.

As a result of experiments conducted by the present inventors using the above-mentioned example device,
When no electric charge is applied to the ultrasonic vibrating element, uneven coating, which is thought to be caused by aggregates, is observed on the coated surface, and the ultrasonic vibrating element has a voltage of 100 to 300 V, 20 to IM) Iz.
It was confirmed that in the case of applying a voltage of , the coating unevenness described above was reduced to an unnoticeable level, and that the coating unevenness in the die width direction was also reduced.

It should be noted that the above embodiments do not indicate any structural limitations of the present invention, and the present invention can be freely modified within the scope of the claims.

<Effects of the Invention> As explained above, according to the coating machine of the present invention, by applying ultrasonic vibration to the paint before it is extruded toward the object to be painted, it is possible to homogenize the paint. In addition to sufficiently destroying aggregates, it is possible to reliably obtain a uniform and stable coated surface without uneven coating, and it is also possible to prevent damage to the object to be coated, thereby improving product quality. It is extremely useful.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of a coating machine according to the present invention;
FIG. 2 is a perspective view showing the structure of the die in the same embodiment as above;
3 and 4 are cross-sectional views showing the internal structure of the same die, respectively, and FIG. 5 is a schematic view showing an example of a conventional coating machine. 4-Die 4A...-Buffer part 4B...Slot part 4b...-Extrusion port 4C...Body
5...Web 6...Tank 7...Introduction pipe 8-...Pump 12.13...Ultrasonic vibration element patent applicant Kao Corporation representative Patent attorney Fujio Sasashima Figure 2 1 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] Comprised of a buffer section filled with paint pumped from a paint supply source, and a slot section at one end communicating with the buffer section and opening at the other end as an extrusion port for pushing out the paint toward the application target. 1. A coating machine comprising: a die for applying ultrasonic vibrations to the coating material during the period between the coating material being supplied to a buffer section and being extruded from an extrusion port;