JPH0655112A - Gravure coater - Google Patents

Abstract

PURPOSE:To prevent a coating liquid from turning around both edge ear parts of a web with no need of replacement of a back up roll at the time of exchanging the web and no position correction of the web in the width direction, regarding a gravure roll. CONSTITUTION:Regarding an off-set gravure roll, a middle roll 2 and a back up roll 3 both of which sandwich a web 4 are so set as to move in the axial direction, respectively, and both rolls 2, 3 are mutually moved to the reverse direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gravure coater for applying a coating liquid over almost the entire width of a web.

[0002]

2. Description of the Related Art In an offset gravure coater, the present applicant has previously proposed to arrange a backup roll 3 so as to be movable in the axial direction (left and right) as shown in FIG. 5 (Japanese Patent Publication No. 62-41774). In this case, the web 4 is passed so that the left end ear portion 4a thereof always slightly protrudes from the left end edge 2a of the intermediate roll 2. Then, the amount of movement of the backup roll 3 to the left is adjusted so that the right edge portion 4b of the web 4 slightly protrudes from the right edge 3b of the backup roll 3. According to this, the both end ears 4a and 4b of the web 4 are not sandwiched between the intermediate roll 2 and the backup roll 3, and the coating liquid does not wrap around to the back side of the both end ears 4a and 4b of the web 4. Even if the width W of the web 4 changes when the webs 4 are switched, it is not necessary to replace the backup roll 3 each time. Therefore, it is not necessary to provide a large number of backup rolls corresponding to the width W of the web 4, and there are many advantages such as being economical.

Even in the direct gravure coater, as shown in FIG. 6, the unmarked portion 2 is formed on the peripheral surface of one end of the gravure roll 1.
The above-mentioned publication discloses that the gravure roll 1 is provided with 5 and only the backup roll 3 is arranged so as to be movable in the axial direction with respect to the gravure roll 1. When using this,
The web 4 is passed so that the left end ear portion 4a thereof slightly protrudes from the unmarked portion 25 of the gravure roll 3. Next, the amount of movement of the backup roll 3 to the left is adjusted so that the right edge 4b of the web 4 slightly protrudes from the right edge 3b of the backup roll 3. Also in this case, as described above, the coating liquid does not wrap around to the back sides of the two end ears 4a and 4b of the web 4.

[0004]

However, in each of the above gravure coaters, since only the backup roll 3 is moved in the axial direction, the movement amount of the backup roll 3 is reduced especially when the horizontal width of the web 4 is reduced. However, the size becomes larger and the device becomes larger. Moreover, when the axial centerline of the coater head is L, as shown in FIG. 5, for example, the widthwise centerline P of the web 4 is displaced as the web width becomes smaller. In this case, I learned that it is necessary to correct the position of the web 4 for all the traveling paths of the web 4, which requires a lot of time and effort. Therefore, an object of the present invention is to obtain a gravure coater in which the backup roll does not have to be replaced each time even if the web width changes and the center of the web in the width direction is not displaced.

[0005]

The present invention has a gravure roll 1, an intermediate roll 2 and a backup roll 3, as shown in FIG. 1, and the intermediate roll 2 and the backup roll 3
In the offset gravure coater that guides the web 4 between and, the intermediate roll 2 and the backup roll 3 are arranged so as to be movable in the axial direction with respect to the web 4. As shown in FIG. 3, in a direct gravure coater that has a gravure roll 1 and a backup roll 3 and guides the web 4 between these rolls 1 and 3, the gravure roll 1 and the backup roll 3 are provided with respect to the web 4. It is located so that it can be moved in the direction of the heart.

[0006]

[Operation] When using the offset gravure coater,
The widthwise center of the web 4 is aligned with the widthwise center of the coater head as before, and one end of the web 4 is
For example, the intermediate roll 2 is moved to one side (the right side in FIG. 1) along the axial direction so that the left end ear portion 4a slightly protrudes from the left end edge 2a of the intermediate roll 2. Next, the backup roll 3 is moved to the other side (the left side in FIG. 1) along the axial center so that the right edge 4b of the web 4 slightly protrudes from the right edge 3b of the backup roll 3.

Also in the direct gravure coater, the gravure roll 1 and the backup roll 3 are respectively moved to the opposite sides in the axial direction with respect to the web 4, and the two end ears 4a and 4b of the web 4 are moved to the left end edge of the gravure roll 1. 1a and the right edge 3b of the backup roll 3 are slightly protruded.

[0008]

According to the present invention, even if the width W of the web 4 changes when the webs 4 are switched, there is no need to shift the web 4 in the width direction to correct the position, and the intermediate roll 2 and the backup roll 3 or the gravure roll can be used. By merely moving the roll 1 and the backup roll 3 to the opposite side by the same dimension, the coating liquid 5 can be prevented from wrapping around to the back side of the both ends 4a and 4b of the web 4.

[0009]

1 and 2 show an embodiment of an offset gravure roll according to the present invention, in which 1 is a gravure roll made of metal, 2 is an intermediate roll made of rubber which rotates in contact with the gravure roll 1, 3 Is a middle roll 2 with a web 4 in between
It is a metal backup roll that rotates in contact with.
The intermediate roll 2 is for uniformly and thinly applying the coating liquid 5 to the web 4, and in order to exert its effect more effectively, the peripheral speeds of the intermediate roll 2 and the gravure roll 1 are changed. The peripheral velocities of the intermediate roll 2 and the backup roll 3 are set to be the same. Generally, there is only one intermediate roll 2, but there may be a plurality of intermediate rolls.

The gravure roll 1 is arranged so as not to move left and right as in the conventional case. However, the support shafts 6 and 7 extend from both ends of the intermediate roll 2 and the backup roll 3, respectively, and the left and right support shafts 6 and 7 are the bearings 9 on the machine frame side.
・ It is slidably supported by 10. Each support shaft 6 ・ 7
The collars 11 and 12 fitted in the bearings are bearings 9 and 10, respectively.
It can be fixed with set screws 13 and 14 in a state of contacting with, and by loosening each set screw 13 and 14, the backup roll 3 and the intermediate roll 2 can be moved laterally in FIG. 1 with respect to the web 4. Is.

In use, even when the web 4 is replaced with one having a different width dimension, the center in the width direction is left as it is, and the left end ear 4a of the web 4 is the intermediate roll 2.
Of the intermediate roll 2 so that it slightly protrudes from the left edge 2a of the
Is moved to the right side in FIG. 1 along the axial direction. Next, the right edge 4b of the web 4 is attached to the right edge 3 of the backup roll 3.
The backup roll 3 is moved to the left side in FIG. 1 along the axis so as to slightly protrude from b. In this case, the moving amounts of the intermediate roll 2 and the backup roll 3 in the left-right direction are set to be the same. That is, the smaller the width W of the web 4 is, the larger the movement amount of the intermediate roll 2 and the backup roll 3 is.

In the above case, the two end ears 4a and 4b of the web 4 are not always pinched between the intermediate roll 2 and the backup roll 3 even if the web 4 is not moved in the width direction. As a result, the coating liquid 5 is applied to both ends 4a of the web 4.
・ Does not wrap around the back side of 4b. That is, even if the width W of the web 4 is changed within the range of the left and right width of the intermediate roll 2 or the backup roll 3, whichever is smaller, this can be dealt with well.

(Embodiment 2) FIGS. 3 and 4 show an embodiment of a direct gravure coater according to the present invention. The gravure roll 1 and the backup roll 3 are axially opposite to each other with respect to the web 4. It is arranged so that it can be moved. Also in this case, the web 4 is kept constant without moving the center line in the width direction, and the left end ear portion 4a thereof is slightly protruded from the left end edge 1a of the gravure roll 1 in the axial direction (right direction in the figure) of the gravure roll 1. Adjust the amount of movement to. Next, the right edge 4b of the web 4 is attached to the right edge 3 of the backup roll 3.
The amount of movement of the backup roll 3 in the axial direction (left direction in the figure) is adjusted so that it slightly protrudes from b.

The support shafts 7 and 16 can be inserted into and removed from the backup roll 3 and the gravure roll 1, and both ends thereof are supported by bearings 10 and 17 on the machine frame side.
The collars 12 and 19 can be fixed to the left and right support shafts 7 and 16 by the set screws 14 and 20 while the collars 12 and 19 are in contact with the left and right end surfaces of the backup roll 3 and the gravure roll 1, respectively. If 20 is loosened, the backup roll 3 and the gravure roll 1 can be moved to opposite sides.

In the above-described manner, since the two end ears 4a and 4b of the web 4 are not pinched by the backup roll 3 and the gravure roll 1, the coating liquid 5 reaches the back side of the both ears 4a and 4b. Do not go around. Also in this case, as long as the web 4 is within the width range of the gravure roll 1 or the backup roll 3, the width W of the web 4 can be reliably changed.

Incidentally, the gravure roll 1, the intermediate roll 2,
Regarding the means for supporting the backup roll 3 so as to be movable in the axial direction, each roll 1 on the machine frame side is
The bearings 17, 9 and 10 of the 2.3 support shafts 10 and 6 may be provided so as to be movable in the axial direction.

[Brief description of drawings]

FIG. 1 is a front view of an offset gravure coater.

FIG. 2 is a schematic side view of an offset gravure coater.

FIG. 3 is a front view of a direct gravure coater.

FIG. 4 is a schematic side view of a direct gravure coater.

FIG. 5 is a front view of a conventional offset gravure coater.

FIG. 6 is a front view of a conventional direct gravure coater.

[Explanation of symbols]

 1 Gravure roll 2 Intermediate roll 3 Backup roll 4 Web

Claims (2)

[Claims] 1. An offset gravure coater having a gravure roll 1, an intermediate roll 2 and a backup roll 3, wherein a web 4 is guided between the intermediate roll 2 and the backup roll 3, and the intermediate roll 2 with respect to the web 4. And backup roll 3
A gravure coater characterized in that and are arranged so as to be movable in the axial direction. 2. A direct gravure coater which has a gravure roll 1 and a backup roll 3 and guides a web 4 between these rolls 1 and 3, wherein the gravure roll 1 and the backup roll 3 are centered with respect to the web 4. A gravure coater that is arranged so that it can move in each direction.