JP2013202573A - Coating device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a boundary between a portion to be coated and a portion not to be coated to be beautiful when a base material is not in contact with a recessed part of a support roll, the base material being coated by coming in contact with a coating liquid at a projection part of the support roll and being not coated by being not in contact with the coating liquid at the recessed part, the base material being trained over a support roll so as to generate stress in the direction of the support roll.SOLUTION: There is provided a coating device and a coating method for coating a base material having a prescribed length with a coating liquid. The coating device includes: the coating liquid; a turnable cylindrical support roll; and a turnable coating roll, wherein the base material comes in contact, at a contact position, with the coating liquid applied onto the coating roll while the base material is trained over the support roll. There are a start end part before training the base material over the support roll and a terminating end part after training the base material over the support roll, the start end part and the terminating end part are positioned at the back of the support roll from the contact position to generate stress from the contact position to the back of the support roll, and the support roll has recesses and projections formed on the surface thereof.

Description

  The present invention relates to a coating apparatus for coating a coating liquid on the surface of a substrate which is a flat sheet material.

There is a coating apparatus that hangs a substrate on a support roll and applies a coating liquid with a nozzle in the hanged state. In this case, in order to form a pattern coating, the nozzle was moved to contact or non-contact the substrate.
In addition, there has been a coating apparatus in which the base material is stretched over an uneven plate roll and coating with the coating liquid is not performed at the position of the convex plate roll in contact with the roll.
(For example, refer to Patent Document 1).

JP 2011-98283 A

  Pattern coating by moving the nozzle is difficult to make contact and non-contact instantaneously from the substrate stretched on the support roll, and can completely separate the part where the coating liquid is applied from the part where it is not applied. Therefore, it was difficult to clean the boundary.

  In addition, the coating method described in Patent Document 1 also says that the coating liquid is not coated on the convex part, but the coating liquid may adhere to the roll, and pattern coating by coating and non-coating is completely achieved. It wasn't something to do.

  Therefore, a coating apparatus according to the present invention is a coating apparatus for coating a substrate having a predetermined length with a coating liquid, a rotatable coating roll for applying the coating liquid, and the coating A support roll that is in the same axial direction as the roll and is rotatable in the vicinity of the coating roll in a state where the base material is stretched, and the base material is applied to the coating roll It is stretched over the support roll so that a force is applied in the direction pulled to the support roll side from the contact position with the applied coating liquid, and the support roll has irregularities corresponding to the coating pattern formed on its surface It is characterized by being.

  Further, the transfer of the base material to the support roll is performed by tensioning the base material so that the base material and the coating liquid are in contact with each other at the contact position, and before being extended to the contact position. It is preferable that the substrate after being stretched is positioned on the support roll side from the contact position.

  Moreover, it is preferable to provide the homogenization unit which equalizes the said coating liquid apply | coated to the surface of the said coating roll.

  Further, the coating method according to the present invention is a coating method for coating a substrate having a predetermined length with a coating solution, the coating solution being applied to a rotatable coating roll, The support roll and the coating roll are in the same axial direction as the roll, and the support roll and the coating roll are in contact with the coating liquid applied to the coating roll at the contact position in a state where the base is stretched. The support roll is stretched so that a force is applied in the direction of being pulled to the support roll side, and the support roll is formed with irregularities on its surface, thereby realizing pattern coating.

  According to the first aspect of the present invention, pattern coating according to the unevenness of the surface of the support roll becomes possible. In addition, when the base material is pulled from the contact position between the support roll and the coating roll to the support roll side, the support roll rotates and the contact position becomes the concave portion. It becomes non-contact, and it becomes possible to make a pattern coating with a beautiful boundary between the coating part and the non-coating part.

  According to the invention of claim 2, when the base material is stretched over the support roll while the base material is placed on the support roll side from the contact position while the base material is tensioned, The force by which the substrate is pulled from the contact position to the support roll side acts clearly. As a result, the base material moves from the contact position to the concave portion in the concave and convex portions of the support roll, and is not in contact with the coating roll, so that coating is not performed and pattern coating is possible.

  According to the invention of claim 3, the thickness of the coating liquid becomes constant, and a beautiful pattern coating is possible, and a large amount of the coating liquid is applied to a part of the substrate so that the substrate is not in contact with the coating roll at the recessed portion. Even in this case, it does not come into contact with the coating liquid.

  According to the invention described in claim 4, pattern coating according to the unevenness of the surface of the support roll becomes possible. Further, when the force that pulls the base material from the contact position toward the support roll acts, the base material becomes non-contact with the coating roll when the support roll rotates and the contact position becomes the concave portion. It becomes possible to obtain a pattern coating in which the boundary of the non-coating portion is clean.

It is the schematic which shows the coating apparatus and coating method of this invention. (A) is a perspective view which shows an example of the support roll of this invention, (b) is an enlarged front view which shows a support roll. (A) is an enlarged front view which shows the 2nd Example of the support roll of this invention, (b) is an enlarged front view which shows the 3rd Example of the support roll of this invention. It is the front view which expanded a part of FIG. 1 which shows the condition of application | coating uniform of the coating liquid to a coating roll with a knife roll. It is the expanded schematic which shows the coating state of the coating liquid to a base material. It is the expanded schematic which shows that a base material is located in a dent part and will be in a non-contact state with a coating roll. It is the schematic which shows the other Example which used the tension roll other than the start end part and the terminal part.

DESCRIPTION OF EMBODIMENTS Embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a schematic view showing the entire coating apparatus of the present invention.
This coating apparatus includes a base material 1, a support roll 2, a coating roll 3, a coating solution 4, a knife roll 5, a start end portion 11 and a termination end portion 12 as main components.

  The base material 1 is a member to be coated, and is made of a flat film material or paper material having a predetermined length. Specifically, a polyethylene resin film or the like is used, but Japanese paper, western paper, metal foil, or the like may be used.

  The coating liquid 4 is a coating material for coating the substrate 1. Usually, a liquid ink having a certain viscosity is used, but other substances such as lithium may be used.

As shown in FIG. 1, the base material 1 is stretched between the start end portion 11 and the end end portion 12 while being stretched over the support roll 2, and comes into contact with the coating liquid 4 applied to the coating roll 3. Coated.
Here, the start end portion 11 in the present embodiment is a pre-rolled roll on which the base material 1 is wound in advance, and the terminal end portion 12 is an unwinding roll that is wound after the base material 1 is coated. Thus, the base material 1 unwound from the start end portion 11 is stretched around the support roll 2 and is then wound around the end end portion 12.
As will be described later, as shown in FIG. 7, tension rolls 13 and 14 disposed between the start end portion 11 and the end end portion 12 may be disposed to tension the base material 1.

As shown in FIG. 1, the support roll 2 rotates in the direction of the arrow line A. The base material 1 stretched over the support roll 2 moves in the direction of the arrow C as the support roll 2 rotates.
In addition, the rotation direction of the support roll 2 is not limited to the direction of the arrow line A, and may rotate in the counterclockwise direction that is the direction opposite to the arrow line A. This direction of rotation is appropriately changed according to the properties such as the viscosity of the substrate 1 and the coating liquid 4.

The entire support roll 2 is shown in FIGS. The support roll 2 is a cylindrical member having a certain length, and the substrate 1 is wound around. The support roll 2 has a shaft 24 and rotates around the shaft 24.
On the surface 20 of the support roll 2, convex portions 21 a and 21 a and concave portions 22 a and 22 a are alternately and continuously formed in the circumferential direction. In this embodiment, the convex portions 21a and 21a and the concave portions 22a and 22a are formed on the surface of the support roll 2 by four each and continuously formed in the same shape in the longitudinal direction.

  The shapes of the convex portions 21a and 21a and the concave portions 22a and 22a of the support roll 2 are not limited to the shapes shown in FIGS. As will be described later, coating is performed when the base material 1 comes into contact with the coating liquid 4 of the coating roll 3 at the convex portions 21a and 21a, and the base material 1 is coated with the coating roll 4 at the concave portions 22a and 22a. If the positions of the convex portions 21a and 21a and the concave portions 22a and 22a are appropriately changed according to the coating pattern applied to the substrate 1, various coating patterns are obtained.

  As another embodiment, as shown in FIG. 3 (a), on the surface of the support roll, the convex portions 21b and 21b and the concave portions 22b and 22b are shown in FIGS. 2 (a) and 2 (b). Some of them are larger than the examples. In the second embodiment, three convex portions 21b and 21b and three concave portions 22b and 22b are arranged. When the support roll 2 according to the second embodiment is used, the areas of the portion coated on the surface of the substrate 1 and the non-coated portion are larger than those in the first embodiment.

Further, as shown in FIG. 3B, the third embodiment increases the number of coating lines while increasing the number of each of the convex portions 21c and 21c and the concave portions 22c and 22c to narrow the range of the coating portion. There is also.
In this case, as compared with the first embodiment, the areas of the portion coated on the substrate 1 and the non-coated portion are reduced.

As shown in FIG. 1, the coating roll 3 is a cylindrical member similar to the support roll 2, can rotate about its axis 34, and rotates in the direction of the arrow line B.
The shaft 24 of the support roll 2 and the shaft 34 of the coating roll 3 are in the same axial direction, and both are arranged side by side.
Then, the coating roll 3 and the support roll 2 are arranged close to each other so that the base material 1 laid over the support roll 2 and the coating liquid 4 applied to the surface 30 of the coating roll 3 are in contact with each other. Is done.

  A position where the coating liquid 4 applied to the coating roll 3 shown here and the base material 1 stretched over the support roll 2 come into contact is referred to as a contact position 6.

As shown in FIG. 5, when the substrate 1 and the coating liquid 4 applied to the coating roll 3 come into contact with each other at the contact position 6, the coating liquid 4 applied to the surface 30 of the coating roll 3 becomes the base. It adheres to the material 1 and it becomes possible to coat the base material 1 with the coating liquid 4.
In the present embodiment shown in FIG. 5, since the coating roll 3 and the support roll 2 rotate in the same clockwise direction, the coating liquid 4 comes into contact with the substrate 1 at the contact position 6, and the coating liquid After the 4 adheres to the base material 1, the coating liquid 4 is attached so as to be transferred to the base material 1 at the contact position 6 in order to move in the direction of the arrow C of the base material 1.
As described above, the rotation direction of the support roll 2 can be rotated counterclockwise in the direction opposite to the arrow line A. Whether the support roll 2 is rotated counterclockwise depends on the material of the substrate 1 or What is necessary is just to change suitably according to properties, such as a viscosity, of the coating liquid 4. FIG.

  As shown in FIGS. 1 and 4, a supply unit 40 for supplying the coating liquid 4 is disposed on the side opposite to the support roll 2 (left side in FIGS. 1 and 4) when viewed from the coating roll 3. This supply part 40 supplies so that the coating liquid 4 can be apply | coated to the whole surface of the coating roll 3, and it may be the case of the box-shaped supply part 40, or what sprays with a nozzle. . Since the coating roll 3 is rotated clockwise (in the direction of the arrow line B), the coating liquid 3 supplied from the supply unit 40 is directed toward the contact position 6 and the coating roll 3 is rotated.

On the surface 30 of the coating roll 3, the homogenizing unit 5 is disposed between the position where the coating liquid 4 is supplied from the supply unit 40 and the contact position 6. The homogenizing unit 5 in the present embodiment is a knife roll.
The knife roll as the homogenizing unit 5 is a cylindrical member having a step 51 on its surface, and serves to level the coating liquid 4 applied to the surface 30 of the coating roll 3 so as to have a constant thickness. Fulfill.
The homogenizing unit 5 is not limited to a knife roll, and any other unit may be used as long as the applied coating liquid 4 is homogenized.

The presence of this homogenizing unit makes the coating liquid 4 applied to the coating roll 3 from the supply unit 40 uniform. Thereby, when the substrate 1 is coated, not only the coating solution 4 is uniformly adhered, but also when the coating solution 4 and the substrate 1 are not in contact with each other as shown in FIG. It can prevent that many coating liquids 4 are apply | coated to a part of coating roll 3, and it contacts with the base material 1. FIG.
This makes it possible to perform a more beautiful pattern coating.

As described above, the coating liquid 4 applied to the coating roll 3 is applied to the coating roll 3, comes into contact with the substrate 1 at the contact position 6, and the coating liquid 4 adheres to the substrate 1. Can do.
At this time, at the contact position 6, the base material 1 contacts the coating roll 3 at the convex portion 21 of the rotating support roll 2, and the base material 1 does not contact the coating roll 3 at the concave portion 22.
Thereby, pattern coating becomes possible by arrangement | positioning of the convex part 21 and the recessed part 22 of the support roll 2. FIG.

In order to ensure contact and non-contact between the base material 1 and the coating liquid 4 applied to the coating roll 3 at the contact position 6, the base material 1 is transferred to the support roll 2. The substrate 1 before being stretched over the support roll 2 and the substrate 1 after being stretched are positioned on the support roll 2 side as viewed from the contact position 6 (right side in FIG. 1).
Thereby, the base material 1 is stretched over the contact position 6 between the coating roll 3 and the support roll 2 as a vertex, and a force is generated that is pulled from the contact position to the support roll 2 side (right side in FIG. 1). .
Specifically, the positions of the start end portion 11 and the end end portion 12 are arranged on the support roll 2 side (the right side in FIG. 1) from the contact position 6, and tension is given so as to tension the substrate 1.

  Any material may be used as long as a force that pulls the substrate 1 from the contact position 6 to the support roll 2 side (the right side in FIG. 1) is generated, and the position is not limited to the positions of the start end portion 11 and the end end portion 12 shown in FIG. It may be closer to the support roll 2 (right side in FIG. 1) than the positions of the start end portion 11 and the end end portion 12 shown in FIG.

  In addition, as shown in FIG. 7, the start end portion 11 and the end end portion 12 may be disposed, and the tension rolls 13 and 14 may be disposed. In this case, by arranging the tension rolls 13 and 14 from the contact position 6 to the support roll side (right side in FIG. 1) while arranging the start end portion 11 and the end end portion 12 at arbitrary positions, the base material at the contact position 6 is obtained. You may give tension force so that the force by which 1 is pulled to the support roll 2 side (right side in FIG. 1) is generated.

As shown in FIG. 5, the support roll 2 rotates in the direction of the arrow line A, the base material moves in the direction of the arrow line C, and the base material 1 is the convex portion of the surface 20 of the support roll 2 at the contact position 6. At the position 21, the substrate 1 comes into contact with the coating roll, and the coating solution 4 applied to the coating roll 3 is coated on the substrate 1.
Then, as shown in FIG. 6, the support roll 2 further rotates and the base material 1 moves in the direction of the arrow C, and the base material 1 becomes the position of the recess 22 on the surface of the support roll 2 at the contact position. In this case, the base material 1 enters the recessed portion 23 of the recessed portion 22, and the release position 7 is generated between the substrate 1 and the coating roll 3, and is released from the contact.
At this time, since the force from the contact position 6 to the support roll 2 side (the right direction in FIGS. 1 and 6) is generated on the base material 1 by the tension force and the pulling force, the base material 1 enters the recessed portion 23 of the recessed portion 22. The base material 1 and the coating liquid 4 are likely to be non-contact.
Thereby, it becomes possible to make the base material 1 contact or non-contact with the coating roll 3.

  Moreover, as shown in FIG.2 (b), it is good also as the chamfering angles 25 and 25 which chamfered the angle | corner of the both ends of the convex part 21. FIG. By setting the chamfering angle 25, the corners at both ends of the convex portion 21 can be obtained when the base material 1 enters the concave portion 23 of the concave portion 22 and is released from contact with the coating roll 3 at the contact position 6. Compared to the square shape, damage to the base material 1 can be prevented.

DESCRIPTION OF SYMBOLS 1 ... Base material 2 ... Support roll 3 ... Coating roll 4 ... Coating liquid 5 ... Knife roll 6 ... Contact position 7 ... Release position 11 ... Start end part 12 ... End part 20 ... Surface 21 ... Convex part 22 ... Concave part 24 ... Shaft 25 ... Chamfering angle 30 ... Surface 34 ... Shaft 40 ... Supply part 51 ... Step

Claims (5)

A coating apparatus for coating a coating liquid on a substrate having a predetermined length,
A rotatable cylindrical coating roll for applying the coating liquid;
A cylindrical rotatable support roll that is in contact with the coating roll at a contact position in a state where the substrate is stretched,
The base material is stretched so that stress is generated from the contact position toward the back of the support roll,
A coating apparatus, wherein the support roll has irregularities formed on its surface by a coating pattern.   The coating apparatus according to claim 1, wherein the coating roll and the support roll have the same axial direction and the same rotation direction.   The transfer of the base material to the support roll has a first base end portion before being passed over the support roll and a second base end portion after being passed over the support roll, and the first base end portion and the first base end portion The coating apparatus according to claim 1, wherein the two base end portions are located behind the support roll from the contact position. A surface of the coating roll,
The coating apparatus according to claim 1, further comprising a knife roll that is in contact with a position between an application position for applying the coating liquid to the coating roll and the contact position. A coating method for coating a coating liquid on a substrate having a predetermined length,
Apply the coating liquid to a rotatable cylindrical coating roll,
For the cylindrical support roll that is in the same rotational direction in the same axial direction as the coating roll, and is in contact with the coating roll at the contact position in a state where the substrate is stretched,
There is a first base end portion before the base material is passed over the support roll, and a second base end portion after the base roll is passed over, and the first base end portion and the second base end portion are in the contact position. It is placed behind the support roll so that stress is generated from the contact position toward the back of the support roll.
A coating method characterized in that pattern coating is realized by forming irregularities on the surface of the support roll.

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