JP3466004B2 - Coating equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus used in fields such as coating and printing, and more specifically, it applies a magnetic ink to a web of paper, plastic or the like, or a web of intermittent sheets. The present invention relates to a coating device.

[0002]

2. Description of the Related Art Conventionally, a coating method using a die head having a slit nozzle has been known as a method of applying various coating liquids to the above-mentioned stock. In this coating method, the coating liquid is supplied into the manifold of the die head by means of a pump or the like, and the coating liquid is discharged from the slit nozzle to form a coating film on the original fabric. In order to make the coating amount uniform in the width direction, the manifold shape of the die head is optimized.

[0003]

However, when ink is supplied by a pump as in the conventional case, there are variations in the ink supply amount due to fluctuation factors such as pulsation and wear of parts, and the influence on the coating film quality is affected. I can't ignore it. In particular, in double-sided coating, the coating amount often became non-uniform due to variations in the coating conditions on the front and back sides. In addition, obtaining an optimum manifold shape requires a very complicated design, which is not so easy.

The present invention is a magnetic ink coating apparatus, which applies a magnetic ink uniformly in the width direction without using a pump for supplying ink and without requiring a complicated die head manifold shape. An object of the present invention is to provide a coating device that can be used.

[0005]

In order to achieve the above object, the coating apparatus of the present invention is a coating apparatus for applying a magnetic ink to a running stock by a die head having a slit nozzle at the tip of a manifold. In the apparatus, a coil is wound around the die head, and a current is passed through the coil to generate a magnetic field, thereby generating a force for moving the magnetic ink in the manifold toward the slit nozzle. It has a feature.

Further, the coating apparatus of the present invention uses a die head having slit nozzles facing each other at the tips of two manifolds to simultaneously apply the magnetic ink to both surfaces of the raw material running between the slit nozzles. In the coating device to do, coil around the die head,
It is characterized in that a current is caused to flow through this coil to generate a magnetic field, thereby generating a force for moving the magnetic ink in each of the manifolds toward each of the slit nozzles.

In the coating apparatus having the above-described structure, the magnetic ink generated in the coil causes the magnetic ink to flow into the manifold, and the magnetic ink that has flowed in is uniformly accelerated in the manifold, and then flows out from the slit nozzle into the original fabric. Is applied.

[0008]

1 is a schematic sectional view showing an example of a coating apparatus according to the present invention.

In the figure, reference numeral 1 denotes a die head, which is provided with a slit-shaped passage 2 in the longitudinal direction through which a raw fabric S passes in a central state, and manifolds 3 are built in parallel in the left and right portions sandwiching the passage 2. At the tip of the passage side of each manifold 3, slit nozzles 4 facing each other are provided.
4 are provided. A coil 5 is wound around the die head 1, and an electric current is passed through the coil 5 from a power source 6 to generate a magnetic field, so that the magnetic ink in each manifold 3 is directed to each slit nozzle 4. It is designed to generate the force to move. In addition, 7
Are variable resistors for adjusting the electric current, and 8 and 8 are auxiliary pumps for supplying magnetic ink into each manifold 3 from a tank (not shown).

When the magnetic ink is applied to the stock S running by the coating apparatus, first, the auxiliary pumps 8 are operated to supply the magnetic ink into each manifold 3 to fully fill it. After that, the auxiliary pumps 8 and 8 are stopped. Next, a magnetic field is generated in the die head 1 by applying a voltage to the coil 5 and flowing a current. With the generation of this magnetic field, the magnetic ink in each manifold 3 is attracted to the central portion of the die head 1, and accordingly, the magnetic ink is sucked into each manifold 3 from the tanks ahead of the pumps 8, 8. After that, the auxiliary pumps 8 and 8 are not used for supplying the magnetic ink into each manifold 3.

The magnetic ink is uniformly accelerated in the width direction in each manifold 3, flows out uniformly from the outlet of each slit nozzle 4 in the width direction, and is applied to the original fabric S. At this time,
Since the slit nozzles 4 face each other across the original fabric S, the magnetic ink is simultaneously applied to both surfaces of the original fabric S. The amount of application can be adjusted by controlling the magnitude of the magnetic field generated in the coil 5 by changing the resistance value of the variable resistor 7.

The material of the die head 1 is preferably a non-magnetic material, and the thickness of the members of the die head 1 is preferably as thin as possible so that the lines of magnetic force can pass through well. And the manifold 3
The shape of is preferably a rectangular parallelepiped so that the lines of magnetic force flow uniformly. Further, the surface quality becomes good by making the distance between the original fabric S and the outlet of the slit nozzle 4 slightly larger than the film thickness of the coating film.

[0013]

As described above, according to the coating apparatus of the present invention, the magnetic ink is supplied into the manifold of the die head by the action of the magnetic field. Variations in supply amount are reduced, and uniform application in the width direction is possible. Therefore, it is not necessary to complicate the die head manifold shape as in the conventional case.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an example of a coating apparatus according to the present invention.

[Explanation of symbols]

1 die head 2 passages 3 manifold 4 slit nozzle 5 coils 6 power supply 7 Variable resistance 8 auxiliary pumps

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Claims (2)

(57) [Claims] 1. A coating apparatus for applying magnetic ink to a running material by a die head equipped with a slit nozzle at the tip of a manifold, wherein a coil is wound around the die head and an electric current is applied to the coil. A coating apparatus, wherein a magnetic field is generated to generate a force for moving the magnetic ink in the manifold toward the slit nozzle. 2. A coating device for simultaneously applying magnetic ink to both surfaces of a raw material running between the slit nozzles by means of a die head having slit nozzles facing each other at the tips of two manifolds. A coil is wound around the coil, and a current is passed through the coil to generate a magnetic field, thereby generating a force for moving the magnetic ink in each of the manifolds toward each of the slit nozzles. Coating equipment.