JP2015066489A - Gravure coater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gravure coater that can coat a web uniformly with no unevenness at a low cost when coating with a gravure roll having a spiral continuous groove formed in the outer peripheral surface.SOLUTION: A spiral continuous groove 2b gradually positioned on the other end side in a roll rotary shaft direction as the roll approaches in a direction of rotation from one end side in a roll rotary shaft direction is formed in the outer peripheral surface 2a of a gravure roll 2. Coating liquid measuring means 10 is provided with a first suction machine 7 that reduces an amount of a coating liquid reserved on the other end side in a roll rotary shaft direction of a liquid reservoir 14 to restrict the transfer width in a web transportation direction to a specified value.

Description

  The present invention relates to a gravure coating apparatus that coats a web that is continuously conveyed with a coating liquid.

  Conventionally, when a thick coating layer is formed on a web surface using a gravure coating apparatus, it is generally known to use a gravure roll in which a spiral continuous groove is formed on an outer peripheral surface. . The continuous groove has a shape that is gradually located on the other end side in the rotation axis direction from one end side in the rotation axis direction of the gravure roll, and the coating device is formed on the web to be conveyed. While rotating the gravure roll, the coating liquid in the continuous groove is applied to the web while forming a liquid pool part that spans the web and the outer peripheral surface called the bead by the coating liquid in the continuous groove. It is configured to transcribe.

  By the way, in the gravure roll in which the spiral continuous groove is formed on the outer peripheral surface as described above, the coating liquid in the liquid reservoir is moved from one end side to the other end in the roll rotation axis direction by the movement of the continuous groove by the rotation operation of the gravure roll. Accordingly, a phenomenon called so-called “ear height” occurs in which the amount of the coating liquid accumulated in the liquid reservoir increases only in the other end portion in the roll rotation axis direction. . When this ear height phenomenon occurs, a coating failure occurs in which the thickness of the coating layer formed on the web surface is thick only at the other end side in the roll rotation axis direction, and the web winding operation after coating, etc. Will cause problems.

  In order to avoid this, for example, in Patent Document 1, the pitch in the roll rotation axis direction in the continuous groove of the gravure roll is made wider by making the other end side portion wider than the one end side portion in the roll rotation axis direction. The amount of the coating liquid that accumulates in the liquid reservoir is such that the other end is less than the one end in the roll rotation axis direction, and the coating liquid in the liquid reservoir is rolled by the continuous groove during the rotation of the gravure roll. When moving from one end side to the other end side in the rotation axis direction, the position of the liquid surface of the coating liquid in the liquid reservoir is the same in the roll rotation axis direction, and the transfer width in the web conveyance direction is in the roll rotation axis direction. It is made uniform.

JP 2010-5543 A

  However, when the countermeasure against the ear height phenomenon is performed by changing the shape of the continuous groove in the gravure roll as in Patent Document 1, for example, when different types of coating liquids are used, the viscosity is different, so The flow of the coating liquid changes, the position of the coating liquid level changes in the roll rotation axis direction, and even when coating is performed with a different coating width, the end of each coating width Unless the shape of the continuous groove at the position corresponding to the portion is changed, the position of the liquid surface of the coating liquid in the liquid reservoir portion does not become the same in the roll rotation axis direction. Therefore, it is necessary to prepare a gravure roll in which continuous grooves of different shapes are formed each time the coating liquid or the coating width is changed, resulting in an increase in manufacturing cost.

  The present invention has been made in view of such points, and the object of the present invention is to provide a uniform and uniform web with respect to the web when coated with a gravure roll in which a spiral continuous groove is formed on the outer peripheral surface. Another object of the present invention is to provide a coating apparatus that can be applied to the substrate at a low cost.

  In order to achieve the above object, the present invention provides a web of coating liquid without changing the shape of the continuous groove of the gravure roll when coating with a gravure roll having a spiral continuous groove formed on the outer peripheral surface. It is characterized in that the transfer width in the transport direction does not vary in the roll rotation axis direction.

  Specifically, a gravure roll in which a spiral continuous groove located on the other end side in the roll rotation axis direction is gradually formed on the outer peripheral surface from one end side in the roll rotation axis direction to the rotation direction, and a coating liquid. A coating chamber having a reservoir for storing, a coating chamber in which a part of the gravure roll is immersed in the reservoir, and a tip that is in pressure contact with the outer peripheral surface of the gravure roll and adheres to the outer peripheral surface other than the continuous groove Coating liquid measuring means provided with a doctor blade that scrapes and measures excess coating liquid by the rotation operation of the gravure roll, and contacts the web to be conveyed while rotating the gravure roll. A gravure coating device configured to transfer the coating liquid in the liquid reservoir to the web while forming a liquid reservoir extending over the web and the outer peripheral surface by the coating liquid in the groove. The elephant, was taken to solve the following means.

  That is, in the first invention, the coating liquid metering means reduces the amount of the coating liquid collected on the other end side in the roll rotation axis direction of the liquid reservoir, or the coating liquid is stored in the liquid reservoir. Transfer width limiting means is provided for limiting the transfer width in the web conveyance direction to a predetermined value by reducing the amount of coating liquid transferred to the other end side in the roll rotation axis direction of the web by the working liquid. Features.

  According to a second invention, in the first invention, the doctor blade is such that the press contact portion with the outer peripheral surface of the gravure roll is always immersed in the coating liquid in the reservoir, and the transfer width limiting means is provided in the reservoir. And a first suction device for sucking the coating liquid in the vicinity of the doctor blade on the other end side in the roll rotation axis direction.

  According to a third invention, in the second invention, a first communication hole communicating with the reservoir is formed through the other end side in the roll rotation axis direction on the back side of the coating chamber, and the first suction device Is slidably fitted into the first communication hole, and has a first suction nozzle whose tip opening is in contact with and separated from the outer peripheral surface of the gravure roll by a sliding operation.

  According to a fourth invention, in the second invention, the coating liquid metering means is provided near the end of the coating chamber in the roll rotation axis direction, and the tip is pressed against the outer peripheral surface of the gravure roll. A pair of side plates that respectively seal both ends of the storage portion in the roll rotation axis direction, and a second communication hole communicating with the storage portion is formed through either one of the side plates. The first suction device includes a second suction nozzle that is slidably inserted into the second communication hole and whose tip opening moves in a roll rotation axis direction by a sliding operation.

  In a fifth invention, in any one of the first to fourth inventions, the transfer width limiting means is a second suction for sucking the coating liquid collected on the other end side in the roll rotation axis direction of the liquid reservoir. It is equipped with a machine.

  In a sixth invention, in any one of the first to fifth inventions, the transfer width limiting means is provided between the doctor blade and the liquid reservoir and on the other end side in the roll rotation axis direction. An absorbing member is provided so as to be replaceable at a position and absorbs at least one of the coating liquid accumulated in the liquid reservoir and the coating liquid accumulated in the continuous groove.

  In a seventh invention, in any one of the first to sixth inventions, the transfer width limiting means is provided between the doctor blade and the liquid reservoir and on the other end side in the roll rotation axis direction. It is provided with a scraping plate which is provided at a position and scrapes off a part of the coating liquid collected in the continuous groove with its tip pressed against the outer peripheral surface by the rotating operation of the gravure roll.

  In an eighth invention according to any one of the first to seventh inventions, the transfer width limiting means is a position on the other end side in the roll rotation axis direction, and the outer surface of the web and the gravure roll. A mesh sheet is provided so as to be along the web, and reduce the amount of the coating liquid in the liquid reservoir passing through the web.

  According to a ninth invention, in any one of the first to seventh inventions, the transfer width limiting means is a position on the other end side in the roll rotation axis direction, and the outer surface of the web and the gravure roll. It is provided with a permeation sheet which is disposed between and reduces the permeation of the coating liquid accumulated in the liquid reservoir by capillary action.

  In the first aspect of the invention, even if a part of the coating liquid in the liquid reservoir moves from one end side to the other end side due to the movement of the continuous groove by the rotation operation of the gravure roll, Since the transfer width in the web conveyance direction on the end side matches the transfer width in the web conveyance direction on one end side in the roll rotation axis direction, uniform coating without unevenness can be performed. In addition, in order to apply uniformly without unevenness, it is not necessary to prepare gravure rolls having different continuous groove shapes each time the type of coating liquid changes, and the cost does not increase.

  In the second aspect of the invention, the negative pressure near the doctor blade in the reservoir makes it difficult for the coating liquid in the reservoir to enter the continuous groove (the air in the continuous groove is replaced with the coating liquid in the reservoir). The coating liquid that accumulates in the continuous groove in the region on the other end side in the roll rotation axis direction is reduced. Therefore, the amount of the coating liquid that accumulates in the liquid reservoir portion due to the continuous groove is smaller on the other end side than the one end side in the rotational axis direction. With the part moved from one end side to the other end side in the rotation axis direction, the position of the liquid surface of the coating liquid in the liquid reservoir becomes substantially uniform in the roll rotation axis direction, and the coating is performed evenly. Can do.

  In the third aspect of the invention, the position of sucking the coating liquid by sliding the first suction nozzle comes in contact with and separates from the outer peripheral surface of the gravure roll, so the negative pressure value in the vicinity of the continuous groove in the reservoir is changed to It is possible to adjust the amount of the coating liquid that accumulates on the substrate.

  In the fourth aspect of the invention, the position where the coating liquid is sucked moves by sliding the second suction nozzle in the roll rotation axis direction, so the amount of coating liquid accumulated is adjusted according to the width dimension of the web to be coated It is possible to easily change the position of the continuous groove.

  In the fifth invention, even if a part of the coating liquid in the liquid reservoir moves from one end side to the other end side in the roll rotation axis direction due to the movement of the continuous groove by the rotation operation of the gravure roll, the roll rotation axis direction Since the position of the liquid surface of the coating liquid on the other end side matches the position of the liquid surface on the one end side in the roll rotation axis direction, it is possible to stably perform uniform coating without unevenness on the web. it can.

  In the sixth invention, even if the coating liquid in the liquid reservoir moves from one end side to the other end side in the roll rotation axis direction due to the movement of the continuous groove by the rotation operation of the gravure roll, the roll rotation is performed with a simple structure. Since the position of the liquid surface of the coating liquid on the other end side in the axial center direction matches the position of the liquid surface on the one end side in the roll rotation axial direction, uniform coating can be applied to the web, and , You can avoid capital investment.

  In the seventh invention, when the position of the liquid surface of the coating liquid on the other end side in the roll rotation axis direction is matched with the position of the liquid surface on the one end side in the roll rotation axis direction in the liquid pool portion, When the absorption capacity of the absorbing member is reduced, the frequency of periodic work in which an operator replaces the absorbent member with a new one is reduced, and the equipment with a light burden on the operator can be achieved.

  In the eighth invention, the transfer width in the web conveyance direction is in the roll rotation axis direction even when the coating liquid accumulated in the liquid reservoir remains in a state where the other end side is larger than one end side in the roll rotation axis direction. It becomes almost uniform. Therefore, even in the state where the ear height phenomenon has occurred, uniform coating without unevenness can be reliably performed.

  In the ninth invention, even if the coating liquid in the liquid reservoir moves from one end side to the other end side in the roll rotation axis direction due to the movement of the continuous groove by the rotation operation of the gravure roll, the same as in the sixth invention Furthermore, since the position of the liquid surface of the coating liquid on the other end side in the roll rotation axis direction matches the position of the liquid surface on the one end side in the roll rotation axis direction with a simple structure, there is no unevenness on the web. Uniform coating is possible.

It is a side view of the coating apparatus which concerns on Embodiment 1 of this invention. It is A arrow directional view of FIG. It is sectional drawing in the BB line of FIG. FIG. 4 is a view corresponding to FIG. 3 of Embodiment 2 of the present invention. It is FIG. 1 equivalent view of Embodiment 3 of this invention. It is FIG. 5 equivalent view of Embodiment 4 of this invention. It is FIG. 5 equivalent view of Embodiment 5 of this invention. (A) is the FIG. 5 equivalent view of Embodiment 6 of this invention, (b) is the C section enlarged view of (a). FIG. 6 is a view corresponding to FIG. 5 of Embodiment 7 of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiment is merely exemplary in nature.
Embodiment 1 of the Invention
FIG. 1 shows a gravure coating apparatus 1 according to Embodiment 1 of the present invention. The gravure coating apparatus 1 performs coating on a web W guided by a plurality of guide rolls 11 (only two are shown in FIG. 1) and conveyed upward (conveying direction X1 in FIG. 1). is there.

  As shown in FIG. 2, the gravure coating apparatus 1 includes a metal gravure roll 2 rotatably supported on the apparatus fixing side 13 by a pair of rotating shafts 12, and an outer peripheral surface 2 a of the gravure roll 2. A large number of spiral continuous grooves 2b are formed which are gradually positioned on the other end side in the roll rotation axis direction from one end side in the roll rotation axis direction to the rotation direction. Note that the continuous groove 2b in FIG. 2 is exaggerated for easy understanding.

  On one side of the gravure roll 2 in the roll radial direction, a substantially rectangular parallelepiped coating chamber 3 extending in the roll rotation axis direction of the gravure roll 2 is provided.

  As shown in FIG. 1, the coating chamber 3 is provided with a storage portion 3a for storing a coating liquid, and the storage portion 3a is open to the gravure roll 2 side.

  Further, a first communication hole 3b extending in the horizontal direction communicating with the reservoir 3a is formed through the other end side in the roll rotation axis direction on the back side of the coating chamber 3.

  And the coating liquid stored in the said storage part 3a is circulated by the coating liquid circulation apparatus which is not shown in figure, and a part of outer peripheral surface 2a of the said gravure roll 2 is made into the coating liquid of the said storage part 3a. Soaked.

  On the upper part of the coating chamber 3, a plate-shaped resin doctor blade 4 is provided so as to project obliquely downward on the gravure roll side from the peripheral edge of the opening upper end side of the reservoir 3 a.

  The tip of the doctor blade 4 is pressed against the outer peripheral surface 2a of the gravure roll 2 to seal the downstream side in the roll rotation direction of the reservoir 3a, and is attached to the outer peripheral surface 2a other than the continuous groove 2b. The coating liquid is scraped and measured by the rotating operation of the gravure roll 2.

  And the press-contact location to the said gravure roll 2 in the said doctor blade 4 is always immersed in the coating liquid in the said storage part 3a.

  On the other hand, at the lower part of the coating chamber 3, a plate-shaped resin seal plate 5 is provided projecting obliquely upward on the gravure roll side from the peripheral edge of the opening lower end side of the reservoir 3a.

  The seal plate 5 faces the doctor blade 4 and has a tip pressed against the outer peripheral surface of the gravure roll 2 to seal the upstream side of the reservoir 3a in the roll rotation direction.

  Further, a pair of resin side plates 6 are attached to the coating chamber 3 near the end in the roll rotation axis direction.

  The gravure roll 2 side of the side plate 6 has a mountain shape whose vertical length decreases as it goes to the gravure roll 2 side. The curved concave portion 6a is curved and formed.

  Then, the storage portion 3a is hermetically sealed by the doctor blade 4, the seal plate 5, and both side plates 6 by pressing the inner peripheral surface of the curved recess 6a to the outer peripheral surface 2a of the gravure roll 2. ing.

  As shown in FIG. 3, the gravure coating apparatus 1 includes a first suction device 7 (transfer width limiting means) for sucking the coating liquid in the vicinity of the doctor blade 4 on the other end side in the roll axis direction in the reservoir 3a. ).

  The first suction device 7 includes a linear straight nozzle 7a (first suction nozzle) and a pump 7b that sucks the coating liquid in the reservoir 3a through the straight nozzle 7a, and the coating chamber. 3. The doctor blade 4, the seal plate 5 and the side plates 6 constitute the coating liquid measuring means 10 of the present invention.

  The linear nozzle 7a is slidably inserted into the first communication hole 3b, and the tip opening is brought into contact with and separated from the outer peripheral surface 2a of the gravure roll 2 by a sliding operation.

  1 and 2, the gravure coating apparatus 1 contacts the web W while rotating the gravure roll 2 in a direction X2 opposite to the conveyance direction X1 of the web W (see FIG. 1). The coating liquid in the liquid reservoir 14 is transferred to the web W while the liquid reservoir 14 straddling the web W and the outer peripheral surface 2a is formed by the coating liquid in the continuous groove 2b. It has become. 1 is exaggerated for easy understanding.

  Further, by sucking the coating liquid in the vicinity of the doctor blade 4 on the other end side in the roll axial direction in the reservoir 3a with the first suction device 7, the vicinity of the doctor blade 4 in the reservoir 3a becomes negative pressure. This makes it difficult for the coating liquid in the reservoir 3a to enter the continuous groove 2b (it becomes difficult to replace the air in the continuous groove 2b with the coating liquid in the reservoir 3a), and the roll rotation axis direction, etc. The coating liquid collected in the continuous groove 2b in the end region is reduced. Accordingly, the amount of the coating liquid collected in the liquid reservoir portion 14 by the continuous groove 2b is smaller on the other end side than the one end side in the roll rotation axis direction, so that the liquid pool is obtained by the movement of the continuous groove 2b by the rotation operation of the gravure roll 2. In a state where a part of the coating liquid in the portion 14 is moved from one end side to the other end side in the rotation axis direction, the position of the liquid surface of the coating liquid in the liquid reservoir portion 14 becomes substantially uniform in the roll rotation axis direction. It can be applied uniformly without unevenness.

  That is, the first suction machine 7 sucks the coating liquid in the vicinity of the doctor blade 4 on the other end side in the roll axis direction in the reservoir 3a, thereby setting the transfer width of the web W in the web conveyance direction to a predetermined value. The value is limited.

  As mentioned above, according to Embodiment 1 of this invention, a part of coating liquid of the liquid reservoir part 14 moves to the other end side from a roll rotation axis direction direction by the movement of the continuous groove | channel 2b by rotation operation of the gravure roll 2. Even so, since the transfer width in the web conveyance direction on the other end side in the roll rotation axis direction matches the transfer width in the web conveyance direction on one end side in the roll rotation axis direction, uniform coating without unevenness is performed. be able to. In addition, in order to perform uniform coating without unevenness, it is not necessary to prepare the gravure roll 2 having a different shape of the continuous groove 2b every time the type of coating liquid is changed, and the cost is not increased.

  Further, the position where the coating liquid is sucked by sliding the linear nozzle 7a comes in contact with and separates from the outer peripheral surface 2a of the gravure roll 2, so that the negative pressure value in the vicinity of the continuous groove 2b in the reservoir 3a is changed and continuously changed. The amount of the coating liquid that accumulates in the groove 2b can be adjusted.

In Embodiment 1 of the present invention, the change of the suction position of the coating liquid by the first suction device 7 is performed by sliding the linear nozzle 7a inserted in the first communication hole 3b. The structure is not limited, and the linear nozzle 7a itself may be extended or contracted, and any structure may be used as long as the suction position is in contact with or separated from the outer peripheral surface 2a of the gravure roll 2.
<< Embodiment 2 of the Invention >>
FIG. 4 shows a gravure coating apparatus 1 according to Embodiment 2 of the present invention. In this second embodiment, only the parts of the coating chamber 3 and the first suction device 7 are the same as those of the first embodiment except for the partial structures of the first embodiment. Therefore, only the parts different from the first embodiment will be described below. To do.

  The coating chamber 3 of the second embodiment does not have the first communication hole 3b as in the first embodiment, and the second communication hole 3c that communicates with the storage portion 3a in the side plate 6 on the other end side in the roll rotation axis direction. It is formed through.

  Further, the first suction device 7 of the second embodiment extends from the pump 7b to one end side in the roll rotation axis direction, and projects from the extended end toward the gravure roll 2 side (L-shaped nozzle 7c (second suction). The L-shaped nozzle 7c is slidably fitted into the second communication hole 3c, and the tip opening is moved in the roll rotation axis direction by a sliding operation.

  Therefore, according to the second embodiment of the present invention, the position where the coating liquid is sucked is moved by sliding the L-shaped nozzle 7c in the roll rotation axis direction, so that the coating is performed according to the width dimension of the web W to be coated. The position of the continuous groove 2b that adjusts the amount of liquid accumulation can be easily changed.

In Embodiment 2 of the present invention, the change of the suction position of the coating liquid by the first suction device 7 is performed by sliding the L-shaped nozzle 7c inserted into the second communication hole 3c. However, the structure may be such that the L-shaped nozzle 7c itself expands and contracts, as long as the suction position is moved in the roll rotation axis direction of the gravure roll 2.
<< Embodiment 3 of the Invention >>
FIG. 5 shows a gravure coating apparatus 1 according to Embodiment 3 of the present invention. In the third embodiment, there is no first suction device 7 as in the first embodiment, and a second suction device 8 (transfer width limiting means) for sucking the coating liquid in the liquid reservoir portion 14 is provided. Since only the difference from the first embodiment is the same as the first embodiment, only the parts different from the first embodiment will be described below.

  The second suction device 8 includes a suction straw 8a having a thin cylindrical shape, and a pump 8b for sucking the coating liquid in the liquid reservoir portion 14 through the suction straw 8a, and a roll of the liquid reservoir portion 14 By sucking the coating liquid collected on the other end side in the rotational axis direction, the amount of the coating liquid collected on the other end side in the roll rotational axis direction of the liquid reservoir 14 is reduced.

Therefore, even if a part of the coating liquid in the liquid reservoir portion 14 moves from one end side to the other end side in the roll rotation axis direction due to the movement of the continuous groove 2b by the rotation operation of the gravure roll 2, the roll rotation axis direction and the like Since the position of the liquid surface of the coating liquid on the end side matches the position of the liquid surface on the one end side in the roll rotation axis direction, it is possible to stably perform uniform coating with no unevenness on the web W. it can.
<< Embodiment 4 of the Invention >>
FIG. 6 shows a gravure coating apparatus 1 according to Embodiment 4 of the present invention. The fourth embodiment is different from the third embodiment except that the second suction device 8 as in the third embodiment is not provided and an absorption member 15 (transfer width limiting means) made of a sponge is provided. Since these are the same, only the parts different from the third embodiment will be described below.

  The absorbing member 15 is fixed to the device fixing side (not shown) between the doctor blade 4 and the liquid pool part 14 so as to be replaceable at a position on the other end side in the roll rotation axis direction. By absorbing the coating liquid that accumulates in the continuous groove 2b, the amount of the coating liquid that accumulates on the other end side in the roll rotation axis direction of the liquid reservoir 14 is reduced.

  Therefore, even if the coating liquid in the liquid reservoir portion 14 moves from one end side to the other end side in the roll rotation axis direction due to the movement of the continuous groove 2b by the rotation operation of the gravure roll 2, the roll rotation axis direction can be achieved with a simple structure. The position of the liquid surface of the coating liquid on the other end side can be made substantially the same as the position on the one end side in the roll rotation axis direction, uniform coating with no unevenness can be applied to the web W, and capital investment is increased. I can not.

  In addition, although the absorption member 15 of Embodiment 4 is attached to the position which absorbs the coating liquid which accumulates in the continuous groove 2b, it absorbs the coating liquid which accumulates in the liquid reservoir part 14 directly, and the liquid reservoir part 14 You may attach to the position which reduces the quantity of coating liquid, and the absorption member 15 should just absorb at least one coating liquid in the continuous groove | channel 2b and the liquid reservoir part 14. FIG.

In the fourth embodiment, the absorbent member 15 made of sponge is used. However, the absorbent member 15 may be made of a cloth material or the like as long as it absorbs the coating liquid.
<< Embodiment 5 of the Invention >>
FIG. 7 shows a gravure coating apparatus 1 according to Embodiment 5 of the present invention. In the fifth embodiment, there is no second suction device 8 as in the third embodiment, and a resin scraping plate 16 (transfer width limiting means) such as the doctor blade 4 is provided between the doctor blade 4 and the liquid reservoir 14. Since the other points are the same as those of the third embodiment except that they are fixed to the apparatus fixing side 13 at a position between them and at a position on the other end side in the roll rotation axis direction. Only portions different from the third embodiment will be described.

  The scraping plate 16 extends straight up and down, and the lower end (tip) presses against the outer peripheral surface 2a of the gravure roll 2 to rotate a part of the coating liquid that accumulates in the continuous groove 2b. Thus, the coating liquid scraped out and collected in the continuous groove 2b is reduced.

Therefore, according to the fifth embodiment of the present invention, when the position of the liquid surface of the coating liquid on the other end side in the roll rotation axis direction matches the position of the liquid surface on the one end side in the roll rotation axis direction in the liquid reservoir 14. When the absorption capacity of the absorbing member 15 as in the sixth invention is reduced, the frequency of periodic work that the operator replaces with the new absorbing member 15 is reduced, and the equipment with a light burden on the operator can be achieved.
Embodiment 6 of the Invention
FIGS. 8A and 8B show a gravure coating apparatus 1 according to Embodiment 6 of the present invention. The sixth embodiment is different from the third embodiment only in that the second suction device 8 as in the third embodiment is not provided and a mesh-like sheet 17 (transfer width limiting means) that is gently curved in a side view is provided. The other parts are the same as those in the third embodiment, and only the parts different from the third embodiment will be described below.

  The mesh sheet 17 is disposed along the web W on the other end side in the roll rotation axis direction and between the web W and the outer peripheral surface 2a of the gravure roll 2.

  As shown in FIG. 8B, the mesh sheet 17 has a large number of pores 17 a, and reduces the amount of the coating liquid in the liquid reservoir 14 passing toward the web W. The amount of the coating liquid transferred to the other end side in the roll rotation axis direction of the web W is limited.

Therefore, even if the coating liquid that accumulates in the liquid reservoir 14 remains in a state where the coating liquid in the other end side is larger than one end side in the roll rotation axis direction, the transfer width in the web conveyance direction varies in the roll rotation axis direction. Disappear. Therefore, even in the state where the ear height phenomenon occurs, uniform coating without unevenness can be reliably performed.
<< Embodiment 7 of the Invention >>
FIG. 9 shows a gravure coating apparatus 1 according to Embodiment 7 of the present invention. The seventh embodiment is different from the third embodiment except that the second suction device 8 as in the third embodiment is not provided and a permeation sheet 18 (transfer width limiting means) that is gently curved in a side view is provided. Since this is the same as that of the third embodiment, only the parts different from the third embodiment will be described below.

  The permeation sheet 18 is disposed on the other end side in the roll rotation axis direction and between the web W and the outer peripheral surface 2a of the gravure roll 2, and applies the coating liquid accumulated in the liquid reservoir 14 to the capillary tube. The liquid level is lowered by infiltration due to the phenomenon.

  Therefore, even if the coating liquid in the liquid reservoir portion 14 moves from one end side to the other end side in the roll rotation axis direction due to the movement of the continuous groove 2b by the rotation operation of the gravure roll 2, the roll rotation shaft has a simple structure. Since the position of the liquid surface of the coating liquid on the other end side in the center direction matches the position of the liquid surface on the one end side in the roll rotation axis direction, uniform coating with no unevenness on the web W can be performed.

  In the first to seventh embodiments of the present invention, the first suction device 7 and the second suction device 8 serving as transfer width limiting means are individually incorporated in the gravure coating device 1, but the gravure coating device is combined. 1 may be incorporated.

  In Embodiments 1 to 7 of the present invention, the gravure roll 2 is brought into contact with the web W while rotating in the direction X2 opposite to the web W conveyance direction X1, but the gravure roll 2 is brought into contact with the web W conveyance direction X1. You may make it contact the web W, rotating in the same direction.

  Moreover, in Embodiments 1-7 of this invention, although the gravure roll 2 is made from metal, you may form with a stainless steel material or a resin material. Alternatively, a metal gravure roll 2 with a ceramic coating or a hard carbon film surface-treated or a resin gravure roll 2 with a plating treatment may be used.

  Furthermore, in Embodiments 1 to 7 of the present invention, the seal plate 5 is made of resin, but may be made of other materials, for example, stainless steel or rubber. Moreover, you may use what gave the ceramic coat | court to the metal. Alternatively, a metal seal plate 5 with a ceramic coating and a hard carbon film surface-treated, or a resin seal plate 5 with a plating treatment may be used.

  In addition, although the doctor blade 4 is made of resin, it may be made of other materials, for example, metal and rubber. Alternatively, a metal doctor blade 4 with a ceramic coating and a hard carbon film surface-treated, or a resin doctor blade 4 with a plating treatment may be used.

  The present invention is suitable for a gravure coating apparatus that coats a web that is continuously conveyed.

DESCRIPTION OF SYMBOLS 1 Coating apparatus 2 Gravure roll 2a Outer peripheral surface 2b Continuous groove 3 Coating chamber 3a Storage part 3b 1st communicating hole 3c 2nd communicating hole 4 Doctor blade 5 Seal plate 6 Side plate 7 1st suction machine (transfer width restriction means)
7a Straight nozzle (first suction nozzle)
7b Pump 7c L-shaped nozzle (second suction nozzle)
8 Second suction machine (transfer width limiting means)
10 Coating liquid measuring means 15 Absorbing member (transfer width limiting means)
16 Scraping plate (transfer width limiting means)
17 Mesh sheet (transfer width limiting means)
18 Penetration sheet (transfer width limiting means)
W Web

Claims (9)

A gravure roll in which a spiral continuous groove is formed on the outer peripheral surface, which is gradually located on the other end side in the roll rotation axis direction, from the one end side in the roll rotation axis direction to the rotation direction;
A coating chamber in which a coating liquid is stored; a coating chamber in which a part of the gravure roll is immersed in the storage unit; and the outer periphery other than the continuous groove with a tip pressed against the outer peripheral surface of the gravure roll A coating liquid metering means on which a doctor blade for scraping and weighing excess coating liquid adhering to the surface by rotating the gravure roll is disposed;
The gravure roll is brought into contact with the web to be conveyed while being rotated, and a liquid reservoir portion straddling the web and the outer peripheral surface is formed by the coating liquid in the continuous groove while the liquid reservoir portion coating liquid is formed. Is a gravure coating device configured to transfer to the web,
In the coating liquid metering means, the amount of the coating liquid collected on the other end side in the roll rotation axis direction of the liquid reservoir is reduced, or roll rotation of the web is performed by the coating liquid accumulated in the liquid reservoir. A gravure coating apparatus, comprising transfer width limiting means for limiting the transfer width in the web conveyance direction to a predetermined value by reducing the amount of coating liquid transferred to the other end in the axial direction. In the gravure coating apparatus according to claim 1,
The doctor blade is constantly immersed in the coating liquid in the reservoir, the pressure contact point to the outer peripheral surface of the gravure roll,
The gravure coating apparatus, wherein the transfer width limiting means includes a first suction device that sucks the coating liquid in the vicinity of the doctor blade on the other end side in the roll rotation axis direction in the reservoir. In the gravure coating apparatus according to claim 2,
On the other end side in the roll rotation axis direction on the back side of the coating chamber, a first communication hole communicating with the reservoir is formed through,
The first suction device includes a first suction nozzle that is slidably fitted into the first communication hole and has a tip opening that contacts and separates from an outer peripheral surface of the gravure roll by a sliding operation. Gravure coating equipment. In the gravure coating apparatus according to claim 2,
The coating liquid metering means is provided near the end of the coating chamber in the roll rotation axis direction, and the tip is pressed against the outer peripheral surface of the gravure roll, and both ends of the storage section in the roll rotation axis direction With a pair of side plates that seal each part,
A second communication hole communicating with the storage portion is formed through either one of the side plates.
The first suction device includes a second suction nozzle that is slidably inserted into the second communication hole and has a tip opening that moves in a roll rotation axis direction by a sliding operation. apparatus. In the gravure coating device according to any one of claims 1 to 4,
The gravure coating apparatus, wherein the transfer width limiting means includes a second suction device for sucking a coating liquid collected on the other end side in the roll rotation axis direction of the liquid reservoir. In the gravure coating apparatus according to any one of claims 1 to 5,
The transfer width limiting means is provided between the doctor blade and the liquid reservoir, and can be replaced at a position on the other end side in the roll rotation axis direction, and a coating liquid that accumulates in the liquid reservoir, and A gravure coating apparatus comprising an absorbing member that absorbs at least one of the coating liquid accumulated in the continuous groove. In the gravure coating apparatus according to any one of claims 1 to 6,
The transfer width limiting means is provided between the doctor blade and the liquid reservoir and at a position on the other end side in the roll rotation axis direction, and a tip is pressed against the outer peripheral surface to enter the continuous groove. A gravure coating apparatus, comprising: a scraping plate that scrapes off a part of the accumulated coating liquid by the rotating operation of the gravure roll. In the gravure coating apparatus according to any one of claims 1 to 7,
The transfer width limiting means is disposed at the other end side in the roll rotation axis direction and along the web between the web and the outer peripheral surface of the gravure roll, and the coating of the liquid pool portion. A gravure coating apparatus comprising a mesh-like sheet that reduces an amount of a working liquid passing toward the web. In the gravure coating apparatus according to any one of claims 1 to 7,
The transfer width limiting means is disposed between the web and the outer peripheral surface of the gravure roll at a position on the other end side in the roll rotation axis direction, and the coating liquid that collects in the liquid reservoir portion is capillary action A gravure coating apparatus, comprising a permeation sheet that is permeated and reduced by the above.

Images