JP2001121056A - Coating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide excellent liquid draining property at the contact point of the outer circumferential face of a gravure roller and the tip of a scraping plate and to wall scrape the coating liquid adhering to the roller outer circumferential face. SOLUTION: The coating apparatus comprises a gravure roll 22, a scraping plate 40 and a weir plate 41 extending along the right and left direction, which is the longitudinal direction of the gravure roll, and an application tool 23 having a coating liquid chamber 44 to the outer circumferential face 22a of the gravure roll 22. The scraping plate 40 is so installed as to adjust the crossing angle θ formed between the plate from the contact position with the gravure roller outer circumferential face 22 and a tangent line E of the outer circumference face 22a extended in the inverse direction of the gravure roll rotation direction (the A direction shown as the arrow) to be less than 90 degrees.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a coating apparatus of a type in which a plurality of cells recessed on the outer peripheral surface of a gravure roller are filled with a coating liquid.

[0002]

2. Description of the Related Art As shown in FIGS. 6 and 7, a coating device 1 of this type includes a gravure roller 2 forcibly rotating in the direction of arrow A, and a coating device 3 disposed outside the gravure roller 2.
And a backup roller 4 that presses against the outer peripheral surface 2 a of the gravure roller 2. Coating device 3
A casing 5, a scraping plate 6 and a weir plate 7 attached to the casing 5 and extending in the left-right direction which is the longitudinal direction of the gravure roller 2, and end plates 8, 8 provided on both right and left ends of the casing 5. And a coating liquid chamber 9 facing the gravure roller outer peripheral surface 2 a is formed between the scraping plate 6 and the weir plate 7. The casing 5 has a coating liquid supply port 10 below the coating liquid chamber 9 and a coating liquid discharge port 11 above the chamber.

[0003] The coating solution fed under pressure is supplied to a coating solution supply port 1.
0 to the coating liquid chamber 9 and discharged to the coating liquid discharge port 11 while the outer peripheral surface 2 of the gravure roller 2 forcibly rotates.
a, and penetrates into a plurality of cells 2b, 2b,... recessed in the roller outer peripheral surface 2a. With the rotation of the gravure roller 2, the coating liquid adhering to the roller outer peripheral surface 2a is scraped off the roller outer peripheral surface 2a passing through the scraper plate 6 by the scraper plate 6, and a plurality of cells 2b, 2b,. The coating liquid is held only inside. The coating liquid held in the cells 2b, 2b,... Is applied so as to be transferred to the surface of the web W running while being supported by the backup roller 4.

[0004]

The scraping plate 6 and the weir plate 7 are arranged such that the distance between the two plates is smaller on the tip side than on the fixed side. Then, the scraping plate 6 intersects with the tangential line B on the gravure roller outer peripheral surface 2a extending from the contact position between the gravure roller outer peripheral surface 2a and the tip 6a in the direction opposite to the gravure roller rotation direction (the direction of arrow A). Is much more than 90 degrees. For this reason, when a coating liquid having a relatively large surface tension is supplied as the coating liquid, the coating device 1 may have poor liquid drainage at the contact point between the gravure roller outer peripheral surface 2a and the tip 6a of the scraping plate 6, The application liquid adhering to the outer peripheral surface 2a of the roller cannot be completely scraped off, so that an excessive application liquid is applied to the web W, and an accurate application amount may not be secured. In addition, the scraping plate 6 in a state where the liquid drainage is poor has an outer surface 6.
The coating liquid wrapped around b, which further worsened the liquid shortage.

In the conventional coating apparatus 1, when the plurality of cells 2b recessed on the roller outer peripheral surface 2a are large, the tip 6a of the scraping plate 6 bites into the cell 2b and is caught, thereby damaging the cell 2b or scratching the scraping plate. In some cases, the tip 6a was broken, and smooth application could not be performed.

Further, in the conventional coating apparatus 1, when the outer peripheral surface 2 a of the gravure roller on which coating has been completed enters the coating liquid chamber 8 of the coating tool 3 again, air is brought in, and a large amount of air is contained in the coating liquid in the coating liquid chamber 8. May form air bubbles. This bubble is
When adhered to the outer peripheral surface 2a of the roller, the application liquid is prevented from entering the inside of the cell 2b, which may cause a defective portion without application.

Further, in the conventional coating apparatus 1, the thin scraping plate 6 and the dam plate 7 are attached so as to be sandwiched between the casing 5 and the pressing plates 13 and 14. This clamping is performed by a plurality of bolts (not shown) screwed into the casing 5 through the pressing plate 13. By the way, in the case where adjustment in the front-back direction toward the gravure roller outer peripheral surface 2a is performed on the front end 6a of the scraping plate 6, the front-rear position of the thin scraping plate 6 is adjusted with a fingertip with a plurality of bolts once loosened. After that, it is necessary to tighten the bolt again. However, it is very difficult to adjust the front and rear positions of the thin scraping plate 6 with a fingertip, and when the bolts are tightened again, the front and rear positions of the thin scraping plate 6 may shift. For this reason, in the conventional coating apparatus 1, it is difficult to adjust the front and rear of the tip 6a of the scraping plate 6 forward and backward, and it is difficult to accurately adjust the tip 6a over the entire left-right direction. Further, when adjusting the ingress and egress of the tip 7a of the weir plate 7, as in the case of the scraping plate 6, much trouble is required, and it is difficult to accurately adjust over the entire area in the left-right direction. For this reason, it becomes difficult for the scraping plate 6 and the weir plate 7 to press the tips 6a, 7a against the gravure roller outer peripheral surface 2a with a pressing force having a uniform distribution over the entire region in the left-right direction. As a result, the conventional coating apparatus 1 generates uneven coating by uneven scraping of the scraping plate 6 and leaks the coating liquid by uneven blocking of the weir plate 7 to form a coating tool. 3 will cause problems.

[0008]

In order to improve the liquid drainage at the contact point between the outer peripheral surface of the gravure roller and the tip of the scraping plate, the coating liquid adhering to the outer peripheral surface of the roller can be scraped well. Means adopted by the present invention according to claim 1 for making, a gravure roller, a scraping plate and a weir plate extending along the left-right direction that is the longitudinal direction of the gravure roller, a scraper plate and a weir plate Between the gravure roller and the gravure roller rotation direction from the contact position with the gravure roller outer surface. And a crossing angle with a tangent line of the outer peripheral surface of the gravure roller extending to less than 90 degrees. In the present invention, since the intersection angle between the tangent of the gravure roller outer peripheral surface extending in the direction opposite to the gravure roller rotation direction from the contact position between the gravure roller outer peripheral surface and the tip of the scraping plate is less than 90 degrees, It improves the drainage of the liquid at the contact point between the outer peripheral surface of the roller and the tip of the scraper plate. There is no biting of the tip of the device. Further, according to the present invention, even when a coating liquid having a relatively large surface tension is supplied, a good state of liquid drainage at the contact point between the two can be obtained. The coating liquid does not flow around the side.

In order to prevent a large amount of air bubbles from remaining in the coating liquid in the coating liquid chamber, the means adopted by the present invention according to the present invention is characterized in that the coating liquid chamber is located close to the outer peripheral surface of the gravure roller. 2. The coating liquid supply port is opened in the supply area while a coating liquid discharge port is opened in the reflux area on both sides divided into a reflux area near the left and right sides and an intermediate supply area by two partition plates. Coating device. According to the present invention, the coating liquid supplied to the intermediate supply area of the coating liquid chamber is returned to the reflux area on both the left and right sides through the gap between the outer peripheral surface of the gravure roller and the end of each partition plate. Therefore, bubbles generated in the supply area can be discharged to the reflux area.

The means adopted by the present invention according to the third aspect of the present invention is arranged so that the front-rear adjustment of the tip of the scraping plate can be easily and accurately adjusted over the entire area in the left-right direction. A holder for holding the scraping plate is attached to the extended base so as to be movable back and forth toward the outer peripheral surface of the gravure roller, and between the base and the holder, the holder is moved back and forth. 3. The coating device according to claim 1, further comprising an adjusting tool for adjusting the movement. According to the present invention, since the scraping plate is held by the holder, the holder is moved back and forth with the adjusting tool so that the tip of the scraping plate can be moved right and left while maintaining the linearity of the tip. It can be precisely adjusted in all directions.

The means adopted by the present invention according to the fourth aspect of the present invention is such that the front and rear adjustment of the tip of the weir plate can be easily and accurately adjusted over the entire region in the left-right direction. A holder for holding the weir plate is attached to the base portion extending to the gravure roller so as to be able to move back and forth toward the outer peripheral surface of the gravure roller, and the holder is moved back and forth between the base portion and the holder. 4. The coating apparatus according to claim 1, further comprising an adjusting tool for adjusting the movement. According to the present invention, since the weir plate is held by the holder, the holder is moved back and forth by the adjuster so that the front end of the weir plate can be maintained in the entire left-right direction while maintaining the linearity of the end of the weir plate. Can be precisely adjusted over a range of

[0012] In order to make the forward and backward adjustment easier, the means adopted by the present invention according to the fifth aspect is characterized in that the adjusting tool comprises a plurality of long holes formed in the holding tool so as to extend in the left-right direction. 5. The coating apparatus according to claim 3, further comprising a plurality of eccentric cams rotatably connected to the base portion, wherein eccentric shaft portions of the eccentric cams corresponding to the respective long holes are inserted. In the present invention, by adjusting the rotation of the eccentric cam, the long front and rear surfaces of the long holes can be pressed by the eccentric shaft to move the holder in the front and rear direction.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A coating apparatus according to the present invention (hereinafter referred to as "the coating apparatus of the present invention") will be described below with reference to the embodiments shown in FIGS. FIG. 1 is a left side view of the entire coating apparatus, FIG. 2 is a front view of the entire coating apparatus with gravure rolls and backup rollers omitted, and intermediate parts are omitted, and FIG. 4 is an enlarged right-side sectional view taken along line FF in FIG. 2, and FIG. 5 is an enlarged right-side sectional view taken along line CC in FIG.

First, an overview of the entire coating apparatus 21 of the present embodiment will be described. As shown in FIGS. 1 and 2, the coating device 21 includes a coating tool 23 having a gravure roller 22 and a backup roller 24 disposed to be able to advance and retreat toward an outer peripheral surface 22 a of the gravure roller 22. .
The gravure roll 22 is forcibly driven by a driving device (not shown) to rotate in the direction of arrow A. The backup roller 24 guides the web W by contacting the outer peripheral surface 24 a, and transfers the web W from the coating position where the web W is pressed against the outer peripheral surface 22 a of the gravure roller 22 and the outer peripheral surface 22 a of the gravure roller 22. It is designed to move back and forth between the standby position to be separated. When the web W is pressed against the outer peripheral surface 22 a of the gravure roller 22, the backup roller 24 receives a rotational force from the gravure roller 22 and rotates in the direction of arrow G.

The applicator 23 includes a gravure roller 22 rotatably disposed at a fixed position, left and right fixed frames 26, 26 disposed at a fixed position, and left and right fixed frames 26, 26.
26, a left and right long receiving base 29 horizontally rotatably supported on both ends by shafts 28, an applicator main body 30 attached to the receiving base 29 so as to be movable back and forth, and a left and right fixed frame 26,
Left and right operation tool 3 disposed between the base 27 and the receiving table 29
1, 31, an appropriate number of first adjusting tools 32 disposed between the receiving table 29 and the applicator main body 30, and a leak liquid receiving tool 33.

Each of the advancing / retreating operation tools 31 is a fixed frame 2
6 is provided with an operating tool 31a composed of an air cylinder connected to the bracket 26a of the receiving table 29 and the bracket 29a of the receiving table 29. The coating tool main body 30 moves from a coating operation position close to the gravure roll 22 to a standby position separated from the gravure roll 22. There is to move between. The first adjusting tool 32 is provided with a bracket 34 erected on the receiving table 29, and is screwed to the bracket 34 and the tip 35 is attached to the applicator main body 30.
a (see FIG. 4), and a handle 36 attached to the rear end of the bolt 35. The bolt 35 that is pushed and pulled with the rotation of the handle 36 moves the applicator body 30 forward and backward. It is configured to do so.

The applicator body 30 is guided by left and right brackets 60, 60 attached to the receiving table 29 so as to be movable back and forth. The applicator body 30 includes a base 37 extending in the left-right direction that is the longitudinal direction of the gravure roller, a scraper 38 and a dam 39 that are detachably attached to the base 37 and that are movable back and forth. End plates 42, 42 attached to the left and right ends of the portion 37. The applicator body 30 is
As shown in FIG. 4, when stopped at the application operation position, the scraping plate 40 provided on the scraping tool 38 and the dam 39
The coating liquid chamber 44 formed by being surrounded by the dam plate 41, the left and right end plates 42, 42, and the base portion 37, which faces the gravure roller outer peripheral surface 22a. When the application liquid is supplied to the application liquid chamber 44 and the application liquid main body 30 is filled, the application tool main body 30 causes the application liquid to adhere to the rotating gravure roller outer peripheral surface 22a.

The first improvement of the coating device 21 is shown in FIG.
As shown in FIG.
The intersection angle θ between the tangent line E of the gravure roller outer peripheral surface 22a extending in the direction opposite to the gravure roller rotation direction (the direction of the arrow A) from the position where the tip 40a of the
Degrees (eg, 15 ° ≦ θ ≦ 75 ° (preferably 2 °
That is, the scraping plate 40 is provided so that 5 ° ≦ θ ≦ 60 °. The gravure roller 22 has an outer diameter D of 100.
~ 500mm is selected. Since the crossing angle θ is less than 90 degrees, the coating device 21 improves liquid drainage at the contact point between the gravure roller outer peripheral surface 22a and the tip end 40a of the scraping plate 40, and adheres to the roller outer peripheral surface 22a. The coating liquid can be satisfactorily scraped to ensure an accurate coating amount, and the cell 22b on the outer peripheral surface 22a of the gravure roller does not catch the tip 40a of the scraping plate, thereby damaging the cell 22b or breaking the tip of the scraping plate. A smooth application state can be maintained without dripping. Further, even when a coating liquid having a relatively large surface tension is supplied as the coating liquid, the coating apparatus 21 can obtain a good state of liquid drainage at the contact point between the coating liquid and the outer surface of the scraping plate 40. It is possible to maintain a smooth coating state without causing the coating liquid to flow into 40b.

The second improvement of the coating apparatus 21 is shown in FIG.
And the coating liquid chamber 4 of the coating tool main body 30 as shown in FIG.
4, two partition plates 43 (FIG. 3 shows only the right side) approaching the gravure roller outer peripheral surface 22a,
The coating liquid chamber 44 is divided into a reflux area 44a near the left and right sides and an intermediate supply area 44b, a coating liquid discharge port 46 is opened in the reflux areas 44a on both sides, and a plurality of coating liquid supply ports are provided in the supply area 44b. 47. Coating body 30
The coating liquid supplied to the intermediate supply area 44b of the coating liquid chamber 44 flows through the gap between the gravure roller outer peripheral surface 22a and the front end 43a of the partition plate 43 and returns to the reflux area 44a closer to the left and right sides. Therefore, the bubbles generated in the supply area 44b can be discharged to the reflux area 44a. This allows
The coating tool main body 30 dramatically reduces bubbles remaining in the coating liquid in the coating liquid chamber 44, and reduces the outer surface 22a of the gravure roller 22a.
The coating liquid can be surely penetrated into the inside of the cell 22b to perform coating without a coating defect portion.

The base 37 of the applicator body 30 is shown in FIG.
As shown in FIG. 4, a partition box 48 (only the right side is shown in FIG. 3) is formed in a hollow box shape on both sides of the inside, so that the inside 37c is a reflux area on both the left and right sides. 3
7a and an intermediate supply area 37b. Base 3
7 is a rear wall portion 37d forming an intermediate supply area 37b.
In addition, a plurality of coating liquid supply ports 47 are opened in the supply area 44b of the coating liquid chamber 44, and a coating liquid supply pipe 49 is joined to the front wall 37e. Further, the base 37
Is a rear wall portion 37d that forms left and right return zones 37a.
In addition, a coating solution discharge port 46 that opens to the reflux area 44a of the coating solution chamber 44 is opened, and a coating solution discharge pipe 50 (see FIG. 2) is joined to the front wall portion 37e.

A third improvement of the coating apparatus 21 is shown in FIG.
And a base 37 extending in the left-right direction as shown in FIG.
And a second adjustment for adjusting the forward and backward movement of the scraper 38 between the base 37 and the scraper 38 while attaching the scraper 38 to the gravure roller outer peripheral surface 22a so as to be able to move back and forth. That is, the tool 52 is provided. The scraper 38
By connecting the two holding plates 51a and 51b forming the holding tool 51 to each other with a plurality of bolts 53 and integrating them, the scraping plate 40 is connected between the two holding plates 51a and 51b by the backup plate 54. It is pinched with. Attachment of the scraper 38 to the base 37 is performed by holding the holder 51 of the scraper 38.
This is performed by inserting the mounting bolt 61 into the long hole 51 c which is long before and after the hole is drilled, and tightening the mounting bolt 61 to the nut 62 provided on the base 37. Since the applicator main body 30 holds the scraping plate 40 with the holder 51, the holder 51 is moved back and forth by the adjuster 52 so as to maintain the linearity of the tip 40a of the scraping plate 40. The tip 40a can be accurately adjusted over the entire region in the left-right direction, and uniform scraping of the scraping plate 40 ensures uniform coating. When adjusting the movement of the scraper 38 back and forth with the second adjuster 52, the mounting bolt 61 is loosened once.

The fourth improvement of the coating apparatus 21 is shown in FIG.
And a base 37 extending in the left-right direction as shown in FIG.
A dam 39 is attached so as to be movable back and forth toward the gravure roller outer peripheral surface 22a.
And a third adjusting tool 56 for adjusting the movement of the weir 39 in the front-rear direction. The dam 39 is a holder 5
The dam plate 41 is sandwiched between the two sandwiching plates 55a and 55b by connecting the two sandwiching plates 55a and 55b forming the fifth member 5 together with a plurality of bolts 53 and integrating them. The dam plate 41 may be sandwiched together with a backup plate (not shown). Weir 39 for base 37
The mounting of the mounting bolt 61 is performed by inserting the mounting bolt 61 into the long hole 55 c that is long before and after drilling in the holder 55 of the dam member 39, and attaching the mounting bolt 61 to the nut 62 provided on the base 37.
It is done by tightening. The applicator main body 30 is
Since the holding tool 55 is held by the holding tool 55, the holding tool 55 is adjusted in the front-rear direction by the adjustment tool 56 so that the tip 41a of the weir plate 41 is maintained over the entire area in the left-right direction while maintaining the linearity of the tip 41a. Thus, the damper plate 41 can be uniformly blocked by being accurately adjusted, and a smooth coating state can be maintained without contaminating the coating tool main body 30 and the like with the coating liquid.

The adjusting tool 52 includes a plurality of long holes 51d formed in the holding tool 51 so as to be long in the left-right direction, and a plurality of eccentric cams 59 rotatably connected to the base 37. An eccentric shaft 59a of the eccentric cam 59 corresponding to the hole 58 is inserted. The adjusting tool 52 includes the eccentric cam 5.
By adjusting the rotation of 9, the long front and rear surfaces of the long hole 51d can be pressed by the eccentric shaft 59a to move the holder 51 in the front and rear direction. The adjusting device 56 includes the adjusting device 52.
The eccentric shaft 59a presses the long front and rear surfaces of the long hole 51d of the holder 55 so that the holder 55 can be moved in the front and rear direction. Adjuster 52,
Reference numeral 56 denotes a holder 5 by rotating and adjusting the eccentric cam 59.
The operability can be improved because the front and rear adjustment can be easily performed by moving the first and the fifth in the front and rear direction.

[0024]

According to the first aspect of the present invention, the coating device of the present invention improves the liquid drainage at the contact point between the outer peripheral surface of the gravure roller and the tip of the scraping plate to remove the coating liquid adhering to the outer peripheral surface of the gravure roller. It can be scraped well, and even if a coating liquid with a relatively large surface tension is supplied, the scraping plate keeps running well without causing the coating liquid to flow around the outer surface of the scraping plate. Therefore, an accurate application amount can be secured. In addition, the coating apparatus of the present invention does not cause the tip of the scraping plate to bite into the cell on the outer peripheral surface of the gravure roller, so that the coating state is smooth without damaging the cell or breaking the tip of the scraping plate. Can be maintained. In the coating apparatus according to the second aspect of the present invention, the bubbles generated in the supply area are discharged to the reflux area, so that the bubbles remaining in the coating liquid in the coating liquid chamber are drastically reduced. The coating liquid can be surely penetrated into the inside of the substrate, and coating can be performed without a coating defect.

According to the third aspect of the present invention, since the front-rear adjustment of the tip of the scraping plate can be easily and accurately adjusted over the entire region in the left-right direction while maintaining the linearity of the tip of the scraping plate, Uniform application can be ensured by uniform scraping of the scraping plate. In the coating apparatus according to the fourth aspect of the present invention, the front and rear adjustment of the tip of the weir plate can be easily and accurately adjusted over the entire region in the left-right direction while maintaining the linearity of the tip of the weir plate. By the dam, a smooth coating state without contamination of the coating tool can be maintained. According to the coating apparatus of the present invention, since the holder can be moved in the front-rear direction by adjusting the rotation of the eccentric cam, the front-rear adjustment can be easily performed, so that the operability can be improved.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a coating apparatus according to the present invention, and is a left side view of the entire coating apparatus.

FIG. 2 is a front view of the entire coating apparatus, in which a gravure roll and a backup roller are omitted and intermediate portions are omitted in the embodiment.

FIG. 3 is a plan view showing a main part of the coating apparatus in the same embodiment in an enlarged manner and partially in section.

FIG. 4 is an enlarged right side sectional view taken along line FF of FIG. 2;

FIG. 5 is an enlarged right side sectional view taken along line CC of FIG. 2;

FIG. 6 is a left side view showing the entire conventional coating apparatus.

FIG. 7 is an enlarged left side sectional view of a coating tool provided in a conventional coating apparatus.

[Explanation of symbols]

22: gravure roller, 22a: outer peripheral surface, 23: coating tool, 40: scraping plate, 41: dam plate, 44: coating liquid chamber, E:
Tangent, θ ... Crossing angle

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F040 AA22 AB04 AC01 BA26 CB06 CB34 CB40 DB18 DB22 4F042 AA22 BA08 BA10 BA13 BA25 DD07 DD17 DD19

Claims (5)

[Claims] 1. A gravure roller, a scraping plate and a weir plate extending along the left-right direction which is the longitudinal direction of the gravure roller,
An applicator provided with an applicator having a coating liquid chamber facing the gravure roller outer peripheral surface between the scraper plate and the weir plate, wherein the scraper plate is moved from a contact position with the gravure roller outer peripheral surface. A coating apparatus provided so that an angle of intersection with a tangent of an outer peripheral surface of a gravure roller extending in a direction opposite to a rotation direction of the gravure roller is less than 90 degrees. 2. The coating liquid chamber is defined by two partition plates approaching the outer peripheral surface of the gravure roller and is divided into a reflux area near both left and right sides and an intermediate supply area. 2. The coating apparatus according to claim 1, wherein an outlet is opened and a coating liquid supply port is opened in a supply area. 3. A coating device, wherein a holding device for holding the scraping plate is attached to a base portion extending in the left-right direction so as to be movable back and forth toward an outer peripheral surface of the gravure roller. The coating device according to claim 1, wherein an adjusting tool for adjusting the forward and backward movement of the holding tool is provided between the coating tool and the holding tool. 4. The applicator has a holder for holding the weir plate attached to a base extending in the left-right direction so as to be movable back and forth toward the outer peripheral surface of the gravure roller. The coating device according to claim 1, wherein an adjusting tool for adjusting the forward and backward movement of the holding tool is provided between the holding tool and the holding tool. 5. The adjusting tool has a plurality of long holes formed in the holding tool so as to be long in the left-right direction, and a plurality of eccentric cams rotatably connected to the base portion. 5. The coating device according to claim 3, wherein an eccentric shaft of a corresponding eccentric cam is inserted.