KR101541687B1 - Roll coating apparatus having a tension control device - Google Patents

Abstract

The present invention relates to a technique for properly controlling the tension of a film by using a tension control device when a support roll installed for producing an optical sheet with different size from an existing sheet in a roll coating device is replaced by a different support roll. For this, the present invention, in a roll coating apparatus of a master sheet method or rotating roll method, includes a tension apparatus. When a support is replaced by a support roll with different diameter, a gap between a first pressure roll and a second pressure can be controlled by moving the first pressure roll and the second pressure roll forwards or backwards. Thereby, the tension of the film can be controlled.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a roll coating apparatus having a tension adjusting apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll coating apparatus for producing an optical sheet frame, and more particularly, to a tension roller having a tension for adjusting tension of a film, To a roll coating apparatus having a regulating device.

2. Description of the Related Art In recent years, flat panel displays have become mainstream as image display means, and liquid crystal displays (LCDs) have been widely used in flat panel displays.

The liquid crystal display device displays an image using a light source device of a backlight, and the backlight uses the optical sheet to emit light to the LCD module.

Such an optical sheet is produced by a roll coating apparatus. The roll coating apparatus includes a master sheet system in which an optical sheet is produced by using a master sheet formed with fine patterns at regular intervals and a rotation system in which a support roll (rotary roll) in which fine patterns are formed at regular intervals is used to produce an optical sheet Roll method.

In the master sheet type roll coating apparatus or the rotary roll type roll coating apparatus according to the related art, the tension of the film is reduced in a state of using a master sheet of a fixed length or a support roll of a fixed size (diameter) The tension of the film supplied to the roll coating apparatus can be adjusted to an appropriate level by using a tension roll to be adjusted.

2. Description of the Related Art In recent years, televisions equipped with various sizes of liquid crystal display devices have been on the market. In response to this, when a master sheet having different sizes is produced in one roll coating apparatus, the support roll pressing the surface of the film coated with the ultraviolet curing paint is replaced with a support roll of the corresponding size, and the tension of the film should be appropriately adjusted .

However, in the conventional roll coating apparatus, when the previously mounted support rolls are replaced with support rolls of different sizes, the tension of the film can not be adjusted appropriately. Therefore, in one roll coating apparatus, There is a problem that the sheet can not be produced.

Korean Patent No. 10-2008-0015915 Korean Patent Publication No. 10-2006-0107472

SUMMARY OF THE INVENTION It is an object of the present invention to provide a master sheet type roll coating apparatus in which, when a currently supported support roll is replaced with a support roll having a different size, And a roll coating apparatus that adjusts the tension of the roll.

Another problem to be solved by the present invention is to provide a roll coating apparatus of a rotary roll type, in which a currently installed support roll is replaced with a support roll having a different size, And a roll coating apparatus that appropriately adjusts the tension of the film.

According to another aspect of the present invention, there is provided a roll coating apparatus having a tension adjusting apparatus, comprising: a tension roll installed at an entrance of a coating apparatus to adjust tension of a film; A first pressing roll and a second pressing roll which are respectively formed in a cylindrical structure and are engaged and rotated in opposite directions to each other to allow the film to pass through the contact surfaces of the rolls; A support roll which is formed in a cylindrical shape and has a predetermined pattern on a circumferential surface and rotates in engagement with the second press roll to transfer the shape of the pattern onto the film; A painting material supplier for applying an ultraviolet curing paint to one side surface of the film positioned between the outer peripheral surface of the second pressing roll and the outer peripheral surface of the supporting roll; A curing unit installed at a predetermined distance from one side of the support roll to cure the ultraviolet curing coating applied to the surface of the film; And when the support roll is replaced with a support roll having a different diameter, the first press roll and the second press roll are moved downward to be close to the support roll or moved upward to be away from the support roll, And a tension adjusting device for adjusting the distance between the support rolls, thereby adjusting the tension of the film.

According to another aspect of the present invention, there is provided a roll coating apparatus having a tension adjusting apparatus, comprising: a tension roll installed at an entrance of a coating apparatus to adjust tension of a film; A first pressing roll and a second pressing roll which are respectively formed in a cylindrical structure and are engaged and rotated in opposite directions to each other to allow the film to pass through the contact surfaces of the rolls; A support roll which is formed in a cylindrical shape and has a predetermined pattern on a circumferential surface and rotates in engagement with the second press roll to transfer the shape of the pattern onto the film; A painting material supplier for applying an ultraviolet curing paint to one side surface of the film positioned between the outer peripheral surface of the second pressing roll and the outer peripheral surface of the supporting roll; A master roll on which a pattern is formed on a surface of the support roll, passes through the outer circumferential surface of one side of the support roll and overlaps with the film in the light stream section, and provides a running path for traveling in a different path from the film in the remaining section, A rotating roll portion having a first variable roll pair and a second variable roll pair; A curing unit installed at a predetermined distance from one side of the support roll to cure the ultraviolet curing coating applied to the surface of the film; And when the support roll is replaced with a support roll having a different diameter, the first press roll and the second press roll are moved downward to be close to the support roll or moved upward to be away from the support roll, And a tension adjusting device for adjusting the distance between the support rolls, thereby adjusting the tension of the film.

In order to produce an optical sheet having a size different from that of a master sheet type roll coating apparatus, when the currently mounted support roll is replaced with a different size support roll, the tension of the film is appropriately adjusted It is possible to produce optical sheets of various sizes in one roll coating apparatus.

1 and 2 are schematic views of a master sheet type roll coating apparatus having a tension adjusting apparatus according to a first embodiment of the present invention.
3 is a schematic view of a roll coating apparatus of a rotary roll type having a tension adjusting apparatus according to a second embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic view of a roll coating apparatus having a tension adjusting apparatus according to a first embodiment of the present invention. As shown in FIG. 1, the roll coating apparatus 100 includes a film 110, a tension roll 121, A first press roll 122A, a second press roll 122B, a support roll 123, a first conveying roll 124A, a second conveying roll 124B, a paint supply unit 130, a hardening unit 140, And a tension adjusting device 150.

The tension roll 121 is positioned such that the tension of the film 110 can be adjusted when the coating apparatus 100 is installed for the first time or when the tension of the film 110 is deviated from a required level due to environmental changes Like structure.

The first pressing roll 122A and the second pressing roll 122B have a cylindrical structure, and their outer circumferential surfaces are provided so as to be in contact with each other. The second pressing roll 122B is installed to be in contact with the support roll 123 and is rotated by receiving a rotational force from the support roll 123. [ The material of the outer circumferential surfaces of the first pressing roll 122A and the second pressing roll 122B is not particularly limited, but the outer circumferential surface of the first pressing roll 122A is formed of steel, and the second pressing roll 122B May be formed of a rubber material. The first pressing roll 122A and the second pressing roll 122B are rotated in opposite directions to each other by a rotational force supplied from the support roll 123 without generating a rotational force by itself.

The support roll 123 has a cylindrical structure and rotates in engagement with the second press roll 122B. The support roll 123 is formed with a pattern 123A having a predetermined shape (e.g., sawtooth shape) on its circumferential surface. When the support roll 123 is rotated in engagement with the second press roll 122B, (110).

The first transport roll 124A and the second transport roll 124B serve to transport the film 110 that has passed through the support roll 123 to the outside.

The paint supply unit 130 is installed between the outer circumferential surface of the second press roll 122B and the outer circumferential surface of the support roll 123 and passes between the outer circumferential surface of the second press roll 122B and the outer circumferential surface of the support roll 123 And serves to apply an ultraviolet curing paint to one side surface of the film 110.

The hardening unit 140 is installed at a predetermined distance from one side of the support roll 123 to harden the ultraviolet curable coating material applied on the surface of the film 110.

A description will be made of a manufacturing process of the optical sheet by the roll coating apparatus 100. The film 110 supplied from the outside is transferred onto the tension roll 121, the first and second pressing rolls 122A and 122B, 123 are processed continuously in the form of an optical sheet and then conveyed to the outside through the first conveying roll 124A and the second conveying roll 124B.

In the above manufacturing process, when the film 110 passes the bonding surface between the second pressing roll 122B and the support roll 123, the coating film is formed on one side surface of the film 110 by the coating supply unit 130 The surface of the film 110 coated with the cured paint is pressed on the bonding surface of the second pressing roll 122B and the supporting roll 123 to transfer the shape of the pattern 123A . Thereafter, the cured paint applied to the film 110 is cured by ultraviolet rays irradiated from the curing unit 140 while the transferred film 110 passes through the curing unit 140, And is discharged to the outside through the first transport roll 124A and the second transport roll 124B.

The ultraviolet ray (UV) irradiated from the curing unit 140 is not particularly limited, and in this embodiment, it is exemplified that the medium pressure UV is irradiated.

On the other hand, when the supporting roll 123 is replaced with a supporting roll 123 having a different size to produce an optical sheet having a different size from the previous one, the tensile force of the film 110 is relatively changed greatly. It is necessary to adjust the tension appropriately, and the tension adjusting device 150 performs this role.

To this end, the tension adjusting device 150 includes a servo motor 151, a speed reducer 152, a coupler 153, and a ball screw 154.

For example, when the pattern 123A is replaced with a pattern 123A 'having a larger size as shown in FIGS. 1 and 2, the support roll 123 is correspondingly moved to a larger size support roll 123 '). In this case, the tension of the film 110 is adjusted as follows using the tension adjuster 150.

The servo motor 151 rotates its own drive shaft by the number of revolutions corresponding to the drive control signal supplied from the controller (not shown in the figure). There are various methods for outputting the drive control signal. For example, it can be acquired in advance through a substitution test of the support rolls, and constructed in the form of a database, and the controller can read it and output it to the server motor 151 at that time.

The speed reducer 152 adjusts the rotation speed of the drive shaft of the server motor 151 to a designed reduction ratio.

The coupler 153 serves to couple the speed reducer 152 and the ball screw 154 together.

The first and second pressing rolls 122A and 122B integrally formed with the ball screw 154 are rotated by the rotational force transmitted through the coupler 153 to be separated from the supporting roll 123, The tension of the film 110 is adjusted.

As another example, when replacing the pattern 123A 'with the pattern 123A having a smaller size, the first and second pressing rolls 122A and 122B may be supported by the support 123A' So that the tension of the film 110 is adjusted by moving the film 123 downward to be close to the roll 123.

FIG. 3 is a schematic view of a master sheet type roll coating apparatus having a tension adjusting apparatus according to a second embodiment of the present invention. As shown in FIG. 3, the roll coating apparatus 300 includes a film 310, The first press roll 322A, the second press roll 322B, the support roll 323, the first transport roll 324A, the second transport roll 324B, the paint supplier 330, the master sheet 340, pattern 341, rotary roll 351, first variable roll pair 352A, 352B, second variable roll pair 353A, 353B, coating control roll pair 354A, 354B, (355), a hardened portion (360), and a tension adjusting device (370).

The tension roll 321 is positioned such that the tension of the film 310 can be adjusted when the coating apparatus 300 is installed for the first time or when the tension of the film 310 is deviated from the required level due to environmental changes Like structure.

The first pressing roll 322A and the second pressing roll 322B have a cylindrical structure, and their outer circumferential surfaces are provided so as to be in contact with each other. The second press roll 322B is installed in contact with the support roll 123 and is rotated by receiving a rotational force from the support roll 323. The material of the outer circumferential surfaces of the first pressing roll 322A and the second pressing roll 322B is not particularly limited, but the outer circumferential surface of the first pressing roll 322A is formed of steel and the second pressing roll 322B May be formed of a rubber material. The first pressing roll 322A and the second pressing roll 322B rotate in opposite directions to each other by the rotational force supplied from the support roll 323 without generating a rotational force by itself.

The support roll 323 has a cylindrical structure and rotates in engagement with the second press roll 322B. The film 310 and the master sheet 340 are positioned and passed between the support roll 323 and the second press roll 322B. At this time, the support roll 323 supports the shape of the pattern 341 formed on the master sheet 340 to be well formed on the film 310 when the support roll 323 is rotated with the second pressing roll 122B.

The first transport roll 324A and the second transport roll 324B transport the film 110 that has passed through the support roll 323 to the outside.

The paint supply unit 330 is provided between the outer circumferential surface of the second press roll 322B and the outer circumferential surface of the support roll 323 and passes between the outer circumferential surface of the second press roll 322B and the outer circumferential surface of the support roll 323 And serves to apply an ultraviolet curing paint to one side surface of the film 310.

The rotary roll part having the rotary roll 351, the first variable roll pair 352A and the second variable roll pair 353A and 353B has the master sheet 340 on which the pattern 341 is formed, The support roll 323 may be provided on the outer circumferential surface of the support roll 323 to overlap with the film 310 in the durability section and to provide a path for traveling in a different path from the film 310 in the remaining section do.

Each of the first variable roll pairs 352A and 352B and the second variable roll pair 353A and 353B is provided with a paint supply unit (not shown) to apply the paint to the master sheet 340 , And controls the application amount of the ultraviolet curing paint applied to the master sheet 340. For example, when it is desired to increase the application amount of the ultraviolet curing paint applied to the master sheet 340, the rotation center axes of the first variable roll pairs 352A and 352B are shifted without being aligned with each other, So that the rotation center axes of the variable roll pairs 353A and 353B are shifted without being coincident with each other.

In other words, if the pattern of the pattern 341 of the master sheet 340 is deeper than the master sheet 340, the first variable roll pair 352A and 352B may be used to prevent the occurrence of bubbles, And secondarily applying the paint to the master sheet 340 by using the second variable roll pair 353A and 353B and by using the paint supply unit 330, The coating material is finely coated on the sheet 340. However, the application of the paint through the first variable roll pair 352A, 352B and the second variable roll pair 353A, 353B is not fixed but may be selectively performed according to the user's request .

The first coating control roll 354A and the second coating control roll 354B forming the coating control roll pair are respectively rotated in the same direction (for example, clockwise) by receiving rotational force, and the second coating control roll 354B, The outer circumferential surface of the outer circumferential surface of the first variable roll 352A opposite to the outer circumferential surface of contact with the first coating control roll 354A is in contact with the outer circumferential surface of the first variable roll 352A. A coating material is applied to the first coating control roll 354A by a dedicated coating material supplier and the applied coating material is applied to the master sheet 340 through the second coating control roll 354B, The application amount of the ultraviolet curing paint applied to the master sheet 340 is precisely controlled by the blade 355 provided around the outer peripheral surface of the first coating control roll 354A. That is, the pressure applied to the blade 355 is controlled to adjust the degree of scraping from the first coating control roll 354A to precisely adjust the application amount of the ultraviolet curing paint.

The hardening unit 360 is provided at a predetermined distance from one side of the support roll 323 to harden the ultraviolet curable coating material applied to the surface of the film 310. The ultraviolet ray (UV) irradiated from the curing unit 360 is not particularly limited, and in the present embodiment, it is exemplified that the medium pressure UV is irradiated.

On the other hand, in the case of replacing the support roll 323 currently mounted to produce a different size optical sheet with a support roll having a different size, since the tension of the film 310 is relatively changed greatly, And the tension adjusting device 370 performs this function.

To this end, the tension adjusting device 370 includes a servomotor 371, a speed reducer 372, a coupler 373, and a ball screw 374 to adjust the tension as follows.

The servo motor 371 rotates its drive shaft by the number of revolutions corresponding to the drive control signal supplied from the controller (not shown in the figure). There are various methods for outputting the drive control signal. For example, it can be acquired in advance through a substitution experiment of the support rolls, and constructed in the form of a database, and the controller can read it and output it to the server motor 371 at that time.

The speed reducer 372 adjusts the rotation speed of the drive shaft of the server motor 371 to a previously designed reduction ratio.

The coupler 373 serves to couple the speed reducer 372 and the ball screw 374.

The first and second pressing rolls 322A and 322B provided integrally with the ball screw 374 are rotated by the rotational force transmitted through the coupler 373 to be close to the support roll 323 The distance between the outer circumferential surface of the support roll 323 and the outer circumferential surface of the second press roll 322B is adjusted so that the distance between the support roll 323 and the support roll 323 is adjusted, The tension of the film 310 is adjusted.

Although the preferred embodiments of the present invention have been described in detail above, it should be understood that the scope of the present invention is not limited thereto. These embodiments are also within the scope of the present invention.

100, 300: roll coating device 110, 310: film
121, 321: tension rolls 122A, 322A: first pressure roll
122B, 322B: second pressure roll 123, 323: support roll
124a, 324A: first conveying rolls 124B, 324B: second conveying rolls
130, 330: paint supply unit 140, 360:
150, 370: tension adjusting device 351: rotary roll
352A, 352B: first variable roll pair 353A, 353B: second variable roll pair
354A, 354B: coating control roll pair 355: blade

Claims (9)

A tension roll installed at the beginning of the coating apparatus to adjust tension of the film;
A first pressing roll and a second pressing roll which are respectively formed in a cylindrical structure and are engaged and rotated in opposite directions to each other to allow the film to pass through the contact surfaces of the rolls;
A support roll which is formed in a cylindrical shape and has a predetermined pattern on a circumferential surface and rotates in engagement with the second press roll to transfer the shape of the pattern onto the film;
A painting material supplier for applying an ultraviolet curing paint to one side surface of the film positioned between the outer peripheral surface of the second pressing roll and the outer peripheral surface of the supporting roll;
A curing unit installed at a predetermined distance from one side of the support roll to cure the ultraviolet curing coating applied to the surface of the film; And
When the support roll is replaced with a support roll having a different diameter, the first press roll and the second press roll are moved downward to come close to the support roll, or moved upward to move away from the support roll, And a tension adjusting device for adjusting the distance between the support rolls, thereby adjusting the tension of the film,
The tension adjustment device
A server motor for rotating the drive shaft by a rotation number corresponding to the drive control signal supplied from the controller based on the database obtained through the replacement test of the support roll;
A speed reducer that decelerates the rotation speed of the drive shaft of the server motor at a predetermined ratio; And
And a ball screw for moving the first pressing roll and the second pressing roll downward to come close to the support roll or to move the first press roll and the second press roll up to move away from the support roll while being rotated by the rotation speed by the rotational force transmitted through the speed reducer Wherein the roll coating apparatus is provided with a tension adjusting mechanism.
The apparatus of claim 1, wherein the roll coating apparatus
Further comprising a first conveying roll and a second conveying roll for conveying the film passed through the support roll to the outside.
delete The roll coating apparatus according to claim 1, wherein the speed reducer and the ball screw are coupled by a coupler.
delete The image forming apparatus according to claim 1, wherein the hardening unit
Characterized in that the film is irradiated with ultraviolet ray (UV).
A tension roll installed at the beginning of the coating apparatus to adjust tension of the film;
A first pressing roll and a second pressing roll which are respectively formed in a cylindrical structure and are engaged and rotated in opposite directions to each other to allow the film to pass through the contact surfaces of the rolls;
A support roll which is formed in a cylindrical shape and has a predetermined pattern on a circumferential surface and rotates in engagement with the second press roll to transfer the shape of the pattern onto the film;
A painting material supplier for applying an ultraviolet curing paint to one side surface of the film positioned between the outer peripheral surface of the second pressing roll and the outer peripheral surface of the supporting roll;
A master roll on which a pattern is formed on a surface of the support roll, passes through the outer circumferential surface of one side of the support roll and overlaps with the film in the light stream section, and provides a running path for traveling in a different path from the film in the remaining section, A rotating roll portion having a first variable roll pair and a second variable roll pair;
A curing unit installed at a predetermined distance from one side of the support roll to cure the ultraviolet curing coating applied to the surface of the film; And
When the support roll is replaced with a support roll having a different diameter, the first press roll and the second press roll are moved downward to come close to the support roll, or moved upward to move away from the support roll, And a tension adjusting device for adjusting the distance between the support rolls, thereby adjusting the tension of the film,
The tension adjustment device
A server motor for rotating the drive shaft by a rotation number corresponding to the drive control signal supplied from the controller based on the database obtained through the replacement test of the support roll;
A speed reducer that decelerates the rotation speed of the drive shaft of the server motor at a predetermined ratio; And
And a ball screw for moving the first pressing roll and the second pressing roll downward to come close to the support roll or to move the first press roll and the second press roll up to move away from the support roll while being rotated by the rotation speed by the rotational force transmitted through the speed reducer Wherein the roll coating apparatus is provided with a tension adjusting mechanism.
8. The apparatus of claim 7, wherein the first variable roll pair and the second variable roll pair
Wherein a coating amount of the ultraviolet curing paint applied to the master sheet is adjusted by applying paint to the master sheet with each paint supply device, .



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