JPH0128859Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a coating device, and particularly to an electrostatic coating device in a gravure coater.

[Conventional technology]

The conventional gravure coater, as shown in Figure 3,
A material to be coated, such as paper or plastic, is held between a rotatable printing cylinder d, which has a large number of recesses c on its outer circumferential surface b, and a rotatable roll-shaped impression cylinder e, in a compressed manner, and the material is held in the direction indicated by the arrow h. The concave portion c
The coating liquid f adhering to ... was transferred to the material to be coated a. In other words, the coating liquid f was transferred onto the material to be coated a by only the pressing force of the impression cylinder e in the direction of the arrow g.

[Problem that the invention attempts to solve]

Therefore, in the past, the coating liquid f was transferred onto the material a to be coated only by the pressing force of the impression cylinder e, so there was a risk that the coating liquid f in the concave portion c of the plate cylinder d would not be completely transferred, resulting in uneven coating. .

This invention solves these conventional problems and
It is possible to reduce the pressing force of the impression cylinder, and
It is an object of the present invention to provide a coating device that is capable of thin film coating and does not cause uneven coating.

[Means for solving problems]

The coating device of the present invention has a coating roll that has a large number of minute recesses on its outer circumferential surface, and rotates while partially immersed in the coating liquid so that the coating liquid adheres to the inside of the recesses; an impression cylinder made of a rotatable conductive rubber roll that runs a material to be coated made of conductive paper, plastic, etc. in a press-contact manner in cooperation with the coating roll; the impression cylinder and the material to be coated; and an ion generator that negatively or positively charges particles of the coating liquid in the recessed portion.

[Effect]

With the above configuration, when particles of the coating liquid in the recesses of the coating roll are negatively (or positively) charged with the ion generator, the particles repel each other,
It tries to jump out from the recess.

〔Example〕

Hereinafter, the present invention will be explained in detail based on drawings showing embodiments.

In FIG. 1, reference numeral 1 denotes a coating roll that rotates around an axis 3 while being partially immersed in a coating liquid 2, and as shown in FIG. have. Therefore, the coating roll 1 exposed from the surface 6 of the coating liquid 2 has the coating liquid 2 attached to the recesses 5 . Further, as the coating liquid 2, a mixture of a non-conductive solvent and a conductive or non-conductive pigment is used. 7 is coating liquid 2
It is a container that stores. Note that the minuteness of the minute recesses 5 refers to the micron unit, and it is preferable that the coating roll 1 is so-called gravure in which the minute recesses 5 are made using a photographic technique.

Next, reference numeral 8 denotes an impression cylinder made of a conductive rubber roll rotatable around an axis 9 and installed above the coating roll 1, which is used to coat a material to be coated 10 made of non-conductive paper, plastic, etc. , cooperating with the coating roll 1 to run while being held in pressure contact. That is, the material to be coated 10 running is interposed between the coating roll 1 and the impression cylinder 8, and the material to be coated 10 is moved in the direction of the arrow while rotating the coating roll 1 and the impression cylinder 8 as shown by arrows A and B, respectively. Run as shown in C. Reference numerals 11 and 11 indicate guide members such as rollers that guide the movement of the material to be coated 10 .

12 is an ion generator that generates negative or positive ions, and the impression cylinder 8
The coating liquid 2 particles 13 (i.e., pigment or solvent particles) in the recess 5 are negatively ( or positive) ions. Therefore, the particles 13 of the coating liquid 2 in the recesses 5...
is negatively (or positively) charged. That is, if a non-conductive pigment is used, the solvent is also non-conductive, so the pigment and solvent particles are negatively (or positively) charged. Furthermore, if a conductive pigment is used, only the solvent particles will be negatively (or positively) charged. Reference numerals 14 and 14 are ion removal devices provided in the vicinity of the material to be coated 10 before and after passing between the coating roll 1 and the impression cylinder 8, and neutralize negative (or positive) ions. That is, ions in the material to be coated 10 are removed on the upstream and downstream sides of the impression cylinder 8.

Next, a method of coating the material to be coated 10 with the coating liquid 2 using the coating apparatus configured as described above will be explained.

With the material to be coated 10 sandwiched between the coating roll 1 and impression cylinder 8 in a press-contact manner, the coating roll 1 is rotated in the direction of arrow A, and the impression cylinder 8 is rotated in the direction of arrow B. drive in the direction.

In this case, in the ion generator 12, the particles 13 of the coating liquid 2 in the recesses 5 of the coating roll 1 are negatively (or positively) charged, and the particles 13 repel each other. Then, as the coating liquid 2 tries to jump out from the recess 5...
The material to be coated 10
With a slight pressing force in the direction of arrow D, the coating liquid 2 is transferred onto the material to be coated 10 . In addition, the impression cylinder 8
Since the ions in the material to be coated 10 are removed by the ion removal device 14 on the more upstream side, the material to be coated 10 is in an uncharged state.
The particles 13 of the coating liquid 2 in the recess 5 are easily charged. Further, the material to be coated 10 is brought into an uncharged state by the ion removing device 14 downstream of the impression cylinder 8, and the particles 13 of the coating liquid 2
... do not repel each other, and separation of the coating liquid 2 from the material to be coated 10 is prevented.

The present invention is not limited to the illustrated embodiment, and the design may be changed without departing from the gist of the present invention. For example, when the material to be coated 10 is smaller than the impression cylinder 8, the exposed impression cylinder 8 is coated. It is also preferable to cover the corresponding position of the ion generator 12 to prevent the industrial solution 2 from scattering. It is also preferable to use photosensitive paper, video magnetic tape, etc. as the material to be coated 10. Further, a blade member may be optionally attached to the coating roll 1 in order to scrape off excess coating liquid 2 adhering to the outer peripheral surface 4 of the coating roll 1.

[Effect of idea]

In the coating device of the present invention, the coating liquid 2 in the recesses 5 of the coating roll 1 is used in the ion generator 12.
Since the particles 13 are negatively (or positively) charged, the particles 13 repel each other, and the recesses 5
The coating liquid 2 swells toward the material 10 to be coated as it tries to fly out. Therefore, the impression cylinder 8
Even if the pressing force is very small, the material to be coated 10
The coating can be coated evenly and without coating. Moreover, thin film coating is also possible.

[Brief explanation of drawings]

FIG. 1 is a simplified front view showing an embodiment of the present invention;
FIG. 2 is an enlarged sectional view of the main part. FIG. 3 is a simplified front view showing a conventional example. DESCRIPTION OF SYMBOLS 1... Coating roll, 2... Coating liquid, 4... Outer peripheral surface, 5... Minute recess, 8... Impression cylinder, 10... Material to be coated, 12... Ion generator, 13...
…particle.

Claims (1)

[Claims for Utility Model Registration] Having a large number of minute recesses 5 on the outer circumferential surface 4, and
A coating roll 1 rotates while partially immersed in the coating liquid 2, and the coating liquid 2 adheres to the recesses 5.
and an impression cylinder 8 made of a rotatable conductive rubber roll that runs a material to be coated 10 made of non-conductive paper, plastic, etc. in a press-contact manner in cooperation with the coating roll 1; A coating device comprising: an ion generator 12 that negatively or positively charges particles 13 of the coating liquid 2 in the recesses 5 via an impression cylinder 8 and a material to be coated 10.