JPH04176355A - Coating device - Google Patents

Abstract

PURPOSE:To greatly improve working efficiency by providing a liquid tank internally contg. a coating liquid, a lower roll disposed with the bottom end of the outer peripheral surface so as to face the inside of the liquid tank and a doctor for scraping the excess liquid sticking to a liquid sticking surface. CONSTITUTION:The width at the right and left side edges of a film 21 which is not coated with an adhesive is subtracted from the width of the film and a sleeve 14 is so moved that the sleeve 14 and the liquid sticking surface 18 of a lower roller 11 overlap on each other at the width equal to this calculated width. The film 21 is passed in such a position where the film projects laterally by as much as a margin component from the end of the sleeve 14 on the side superposed on the liquid sticking surface 18. The adhesive in the liquid tank 16 rises by sticking to the liquid non-sticking surface 17 and liquid sticking surface 18 of the lower roller 11 when the upper roller 12 and the lower roller 11 are rotated in this state. The adhesive sticking to the liquid non-sticking surface 17 is scraped by the front end of the doctor 15 when the lower roller 11 rotates. The adhesive is pushed into the fine grooves 19... of the liquid sticking surface 18 and the remaining adhesive which does not enter the inside of the grooves 19... is scraped by the doctor 15.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a coating device that applies a coating liquid to the left and right end portions of a film and to other portions thereof.

<Prior Art> As shown in FIGS. 4 and 5, a conventional coating device for coating a film with an adhesive has an inlay roll placed above a gravure roll 2 with its lower end facing into a liquid tank 1. 3, scrape off the excess adhesive adhering to the gravure roll 2 with a doctor 4, and remove any fine particles on the outer peripheral surface of the gravure roll 2 when the film 5 passes between the gravure roll 2 and the impregnated roll 3. The adhesive contained in the grooves 6 is applied to the lower surface of the film 5.

If the adhesive is applied over the entire width of the film 5, the adhesive applied to both the left and right ends will wrap around the surface of the base material, so the left and right ends W, W ( (approximately 5 mm) do not apply adhesive. For this reason, in conventional coating equipment, an impregnation roll 3 that is slightly shorter than the width of the film 5 is used, and the left and right end portions W, W of the film 5 are not pressed against the clavier roll 2, but are slightly floated, thereby allowing the adhesive to be removed. It prevented adhesion.

Therefore, a large number of impression rolls 3 having different lengths are prepared for each size of the film 5, and the impression roll 3 is selected according to the film 5 to be coated with adhesive.

<Problems to be Solved by the Invention> However, having to replace the impression roll every time the size of the film changes requires time and effort for the replacement work, resulting in poor work efficiency. Further, preparing a large number of impression rolls (usually 20 to 50 rolls) of different lengths requires a large storage space and is not easy to manage.

<Means for Solving the Problems> The present invention was proposed in view of the above, and the L side is opened,
A liquid tank containing a coating liquid inside, a smooth liquid non-adhesive surface and a liquid adhering surface with fine grooves formed on the outer circumferential surface are formed adjacent to each other in the axial direction, and the lower end portion of the outer circumferential surface is The lower roll faces into the liquid tank, and the tip touches the outer peripheral surface of the lower roll to scrape off the coating liquid adhering to the non-liquid surface of the lower roll, and scrape off the excess liquid adhering to the liquid adhering surface. A sleeve movable in the axial direction of the support shaft is fitted into the support shaft disposed above the lower roll in parallel with the lower roll,
It consists of an upper roll that can fix the sleeve at any position by an expansion mechanism provided on the support shaft.

<Operation> When the sleeve is moved, the width of the overlapping portion between the outer peripheral surface of the sleeve and the liquid adhesion surface of the lower roller changes, and this width becomes the coating width. Therefore, the position of the sleeve is adjusted and fixed according to the width of the film to be processed.

The film is passed between the lower roll and the upper roll, with the film being positioned such that one side end portion or the end portion of the sleeve on the liquid adhesion surface side protrudes laterally.

When the lower roll rotates in this state, the coating liquid in the liquid tank adheres to the liquid non-adhering surface and the liquid adhering surface and rises. The tip of the doctor blade is in contact with the outer circumferential surface of the lower roller, so when the bottom roller rotates, the tip of the doctor scrapes off the adhering coating liquid on the non-adhesive surface, while fine particles are scraped off on the surface where the liquid adheres. The coating liquid is forced into the groove, and the remaining coating liquid that did not enter the groove is scraped off by a doctor.

Therefore, the coating liquid is applied only to the part of the upper roll that is pressed against the sleeve and that is in contact with the liquid adhesion surface of the lower roller, and the coating liquid is applied only to the part of the film that has come out from the sleeve and is pressed against the sleeve. However, the coating liquid is not applied to the other side edge of the film that is separated from the liquid adhering surface.

<Example> Hereinafter, the present invention will be explained based on the drawings.

As shown in FIGS. 1 and 2, the coating device 10 includes a support shaft portion 1 of an upper roller 12 in a direction t of a lower roller 11
3 are arranged in parallel, a sleeve 14 is fitted to the support shaft 13, and the tip of a doctor 15 is brought into contact with the outer peripheral surface of the lower roller 11. Below the lower roller 11 there is a liquid tank 16 whose upper surface is open.
is installed, and the lower end portion of the lower roller 11 faces into the liquid tank 16.

The lower roller 11 has a liquid non-adhering surface 17 and a liquid adhering surface 1 on its outer peripheral surface.
8 are formed adjacent to each other in the axial direction. The liquid non-adhesive surface 17 has a mirror finish or other smooth surface so that even if coating liquid adheres to it, it can be easily removed.

It is sufficient that the liquid non-adhesive surface 17 is less than half of the outer circumferential surface of the lower roller 11, and in the embodiment shown in the drawings, it is approximately one-third of the length. On the other hand, the liquid adhesion surface 18 has a large number of fine grooves 19 formed on its surface, as shown in FIG. 3, and is configured so that the coating liquid can be held in each groove 19.

The support shaft portion 13 of the upper roller 12 includes an expansion mechanism that fixes the sleeve 14 at any position. This expansion mechanism is
It may be configured as long as the sleeve 14 can be fixed,
What is shown in the drawing has an expansion rod 20 on the outer peripheral surface of the support shaft portion 13.
... are provided substantially parallel to the axial direction, and can be moved in and out of the outer circumferential surface by the pressure of compressed air supplied from the end of the support shaft portion 13.

The sleeve 14 is a cylindrical body whose inner diameter is slightly larger than the outer diameter of the support shaft portion 13 and whose length is shorter than the length of the liquid adhesion surface 18 of the lower roller 11. Therefore, the sleeve 14 fitted onto the support shaft 13 can move in the axial direction when the compressed air in the support shaft 13 is removed and the expansion rods 20 of the expansion mechanism are dropped. For this reason, the lower roller 11
The length that overlaps the liquid adhesion surface can be set arbitrarily.

Then, after moving the sleeve 14 to a desired position, compressed air is supplied into the support shaft portion 13, and the expansion rod 2 of the expansion mechanism is
0. When the expansion rods 20 are made to protrude, the expansion rods 20 come into contact with the inner circumferential surface of the sleeve 14 and fix the sleeve 14 in that position. Therefore, even if the support shaft portion 13 is rotated, the position of the sleeve 14 does not change. Note that it is desirable that the sleeve 14 has some degree of elasticity in its outer peripheral portion. For this reason, the outer periphery may be coated with rubber.

Note that the upper roller 11 and the lower roller 12 are rotated in opposite directions by a drive source such as a motor, so that both rollers 11 and 1
The structure is such that the film 21 sandwiched between the two can be fed without slipping.

In order to coat the film 21 with an adhesive using the coating apparatus 10 configured as described above, first, the position of the sleeve 14 is adjusted according to the width of the film 21.

That is, the width of the left and right side edges of the film 21 (hereinafter referred to as margins) to which no adhesive is applied is subtracted from the width of the film, and the sleeve 14 and the liquid adhesion surface 18 of the lower roller 11 overlap by a width equal to this calculated width. Move the sleeve 14 as follows. When the film 21 is passed between the upper roller 12 and the lower roller 11, the film 21 is passed from the end of the sleeve 14 that overlaps the liquid adhesion surface 18 (the right end in FIG. 1) to the side by a margin. Pass it through in a position where it sticks out.

When the upper roller 12 and lower roller 11 are rotated in this state,
The adhesive in the liquid tank 16 adheres to the liquid non-adhering surface 17 and the liquid adhering surface 18 of the lower roller 11 and rises. A plate-shaped doctor 15 is provided on the outer peripheral surface of the lower roller 11 over almost the entire width.
When the lower roller 11 rotates, the adhesive adhering to the liquid non-adhering surface 17 is scraped off by the tip of the doctor 15. Further, on the liquid adhesion surface 18, the adhesive is forced into the fine grooves 19, and the remaining adhesive that has not entered the grooves 19 is scraped off by the doctor 15. therefore,
After passing through the doctor 15, the outer circumferential surface of the lower roll 11 rotates with no adhesive attached to the liquid non-adhering surface 17 and adhesive only adhering to the liquid adhering surface 18. Therefore, when this outer peripheral surface contacts the lower surface of the film 21, it is pressed against the sleeve 14 of the upper roll 12 and the lower roller 11
The adhesive is applied only to the part that is in contact with the liquid adhesion surface 18, and even if the margin part of the film 21 protrudes from the sleeve 14 and is pressed by the sleeve 14, it comes off from the liquid adhesion surface 18 and is applied to the non-liquid adhesion surface. No adhesive is applied to the other margins of the film 21 that are in contact with the film 17.

Note that the lower roll 11 of the present invention has been described as having the shaft portion and the outer circumferential surface portion integrally configured in the above embodiments, or it may be of a type in which a sleeve is fitted in the same manner as the upper roll 12. good.

<Effects of the Invention> As explained above, in the present invention, the lower roll is formed with a liquid non-adhesive surface and the liquid adhered surface, and the upper roll is fitted with a movable sleeve. By simply moving the sleeve, the coating liquid can be applied leaving the left and right margins of the film. Therefore, there is no need to replace the upper roll every time the size of the film changes, and work efficiency can be significantly improved.

Also, by preparing several sleeves of different lengths, it is possible to handle almost any size of film. Therefore, the space for storing the upper roller is smaller than before, space efficiency is improved, and management is easier.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a front view of the lower roll and upper roll, Fig. 2 is a side view, Fig. 3 is a sectional view of the lower roll, and Fig. 4 is a conventional coating. A front view of the device, and FIG. 5 is a side view of the same. In the figure, 10 is a coating device, 11 is a rolled roll, 12
1 is an upper roll, 13 is a support shaft, 14 is a sleeve, 15 is a doctor, 16 is a liquid tank, 17 is a standard adhesion surface, 18 is a liquid adhesion surface, 19 is a groove, 20 is an expansion rod as an expansion mechanism, 21
is a film.

Claims (1)

[Claims] A liquid tank with an open top surface into which a coating liquid is placed, and a liquid adhering surface having a smooth non-adhesive surface and fine grooves formed on the outer circumferential surface are arranged adjacent to each other in the axial direction. a lower roll with the lower end of the outer peripheral surface facing into the liquid tank; the tip of the lower roll is brought into contact with the outer peripheral surface of the lower roll, and the coating liquid adhering to the non-liquid surface of the lower roll is scraped off; , a doctor for scraping off excess liquid adhering to the liquid adhering surface; a sleeve movable in the axial direction of the support shaft part disposed above the lower roll in parallel with the lower roll;
A coating device comprising: an upper roll capable of fixing the sleeve at any position by an expansion mechanism provided on the support shaft.