JPS5839814Y2 - Gravure coating equipment - Google Patents

Description

[Detailed description of the invention] The invention involves continuously running a strip of paper, film, metal foil, etc., and applying a viscous coating such as silicone, vinyl chloride, poval, latex, clay, pigment, etc. The present invention relates to an improvement in a gravure coating device for thinly and uniformly coating the surface of the strip-shaped object with a coating solution.

Generally, there are various types of coating equipment, but for example,
．． A gravure coating device is used to form a coating film as thin as 1μ to 40μ on the surface of a strip.

FIG. 1 is a schematic explanatory diagram showing an example of a conventional gravure coating device, in which 1 is a gravure roll with countless minute irregularities carved on its surface, 2 is a coating liquid, 3 is a liquid tank, and 4 is a scraper, and its tip is provided in pressure contact with the surface of the gravure roll 1.

5 is an intermediate roll, 6 is a backup roll, and 7 is a coated strip.

The lower part of the gravure roll 1 is immersed in the coating liquid 2, and the scraper 4 scrapes off the excess coating liquid on the surface above the liquid level in the rotation direction (in the direction of the arrow in the figure), and the grooves in the gravure roll 1 are removed. As the coating liquid enters the groove, as each roll rotates,
The image is transferred to the intermediate roll 5 and then to the strip 7.

However, in the conventional gravure coating apparatus, since the liquid contact length l of the gravure roll 1 is long, this roll 1
The coating liquid 2 is violently agitated by the rotation of the coating liquid 2, and as a result, the coating liquid moves in a vortex in the liquid tank, and air is drawn into the liquid surface, generating bubbles.

As a result, minute air bubbles are mixed into the coated surface of the strip.

In addition, this type of gravure coating equipment has a viscosity of 1000
When the circumferential speed of the gravure roll exceeds approximately 80 m/min at a speed of more than cps, the coating liquid will violently ripple, and due to the irregular movement of the waves, the amount of the coating liquid pumped by the gravure roll will be reduced both in the width direction and over time. It also causes unevenness.

This goes beyond the uniform scraping function of the scraper.
This causes uneven coating on the surface of the strip to be coated.

In view of the above-mentioned conventional drawbacks, the present invention aims to shorten the length of the gravure roll in contact with the liquid and eliminate the damage caused by the rotation of the gravure roll and the turbulence of the coating liquid moving in contact with it.
In addition to improving the means for supplying coating liquid to the gravure roll,
The present invention provides a novel gravure coating device that can prevent uneven wear of a scraper.

EMBODIMENT OF THE INVENTION Hereinafter, the structure of this invention will be explained in detail by the Example shown in drawing.

In FIGS. 2 to 4, 1 is a gravure roll, 8 is a coating liquid supply means, and 20 is a drive mechanism for sliding the coating liquid supply means 8.

The gravure roll 1 has a bearing 27 on a frame 23 as before.
It is pivoted at , and rotates in the direction of the arrow in the figure.

The coating liquid supply means 8 includes at least a bottom plate 9, a side plate 10, a scraping plate 11. and a partition plate 12, and these joints are in close contact with each other to form a storage chamber for the coating liquid 2.

The scraping plate 11 is erected on the bottom plate 9 along the axial direction of the gravure roll 1, and is made of a material softer than the roll 1, such as metal or plastic.

At both ends of contact between the scraping plate 11 and the roll 1, end plates 1 made of the same material as the scraping plate 11 are provided to prevent the coating liquid from leaking.
0b is provided.

The end plate 10b has an arcuate cutout shape along the surface of the gravure roll 1, and is provided alongside the side substrate 10a.

The coating liquid supply means 8 is installed on the slide table 16 via a universal joint 19 and an air cylinder 17.

The air cylinder 17 is connected between the back plate 13 of the coating liquid supply means and the slide table 16 through universal joints 18a and 18b, respectively.
The coating liquid supply means 8 is always pressed against the gravure roll 1 side, so that the scraping plate 11 and the end plate 10b are brought into pressure contact with the surface of the gravure roll 1.

The partition plate 12 consists of a substrate 12a that is erected on the bottom plate 9 to face the scraping plate 11, and an adjustment plate 12b that is attached above the substrate 12a so that its height can be adjusted.

The adjustment plate 12b defines the liquid contact length of the gravure roll 1.

That is, the coating liquid 2 supplied from the supply pipe 14 is applied to the adjustment plate 1
2b is filled to the upper edge, and any overflow therefrom is collected through a discharge pipe 15 provided on the bottom plate 9.

The liquid contact portion of the gravure roll 1 extends from the contact portion with the scraping plate 11 to the coating liquid surface.

Therefore, the liquid contact length l' is determined by the level of the coating liquid 2, that is, the height of the adjusting plate 12b.

Therefore, the scraping plate 11 that is in pressure contact with the gravure roll 1
In addition, the end plate 10b gradually wears out due to the rotation of the gravure roll 1, and the length l' in contact with the liquid also gradually expands. The level and therefore the liquid contact length l' can be adjusted as appropriate.

Incidentally, the wear of the scraping plate 11 is not uniform over the entire length, and striped undulations corresponding to the unevenness of the surface of the gravure roll 1 occur.

As a result, the uniform scraping function is impaired and furthermore, it can cause damage to the surface of the gravure roll 1. Therefore, such uneven wear of the scraping plate (including the conventional scraper) should be prevented as much as possible. Therefore, the coating liquid supply means 8 should be used.
It is effective to reciprocate and slide parallel to the axial direction of the gravure roll 1.

The drive mechanism 20 for sliding the coating liquid supply means 8 is
The eccentric cam 25 fitted on the camshaft 26 and the spring 2
4 and a slide shaft 21 elastically biased.

The camshaft 26 is rotationally driven by a suitable power source (not shown), and the slide shaft 21 is supported by a slide bearing 22 on the frame 23 and fixed to the slide table 16.

The spring 24 presses the slide shaft 21 toward the eccentric cam 25, so that the slide shaft 21 reciprocates in the axial direction as the cam shaft 26, that is, the eccentric cam 25 rotates.

Therefore, the scraping plate 11 of the coating liquid supply means 8 also reciprocates in parallel to the axial direction of the gravure roll 1.

As a result, the wear of the scraping plate 11 becomes uniform over the entire length.

As explained above, the gravure coating apparatus of the present invention has a rotatable gravure roll that is supported and rotated, and a coating liquid supply means, in which the coating liquid supply means is provided at least on the bottom plate and the side plate. and a scraping plate, and a partition plate facing the scraping plate, and these joints are in close contact with each other, and the tip of the scraping plate is pressed parallel to the surface of the gravure roll. , and a part of the side plate is also cut out in an arc shape along the surface of the gravure roll and brought into pressure contact,
Since the coating liquid supply means is driven to reciprocate and slide parallel to the gravure roll, the length of the gravure roll in contact with the liquid is short, resulting in problems caused by the relationship between the viscosity of the coating liquid and the rotational movement of the gravure roll. Prevents vortex movement of coating liquid,
In addition to eliminating air entrainment, it is possible to eliminate ripples in the coating liquid, and it is possible to always adjust the wetted length to the optimum length.

Therefore, good gravure coating without coating unevenness can be achieved.

Furthermore, since the scraping plate wears uniformly, the scraping function is improved and there is no fear that the surface of the gravure roll will be damaged.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of a conventional gravure coating apparatus. Figure 2 is a longitudinal sectional view of the main parts of the gravure coating device of the present invention;
FIG. 3 is a plan view of the same, and FIG. 4 is a side view of the same. 8... Coating liquid supply means, 9... Bottom plate,
10... Side plate, To b... End plate, 1
DESCRIPTION OF SYMBOLS 1... Scraping plate, 12 b... Adjustment plate, 20... Drive mechanism, 21... Slide shaft, 23... Frame , 24... Spring, 25... Eccentric cam.

Claims (1)

[Scope of utility model registration request] In a gravure coating device having a gravure roll that is rotatably supported and a coating liquid supply means that stores a coating liquid,
The coating liquid supply means consists of at least a bottom plate, a side plate, a scraping plate, and a partition plate facing the scraping plate, the joints of which are in close contact with each other, and the tip of the scraping plate is connected to the gravure plate. In order to press the roller in parallel with the surface of the roll, a part of the side plate is also cut out in an arc shape along the surface of the gravure roll, and to make the coating liquid supply means reciprocate parallel to the gravure roll. A gravure coating device characterized by being driven.