JP2012171240A - Gravure application device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gravure application device which prevents substrate film defacement, increases product quality, and reduces the cleaning time of the gravure application device, thereby improving productivity.SOLUTION: The gravure application device 10 has at least a plate cylinder 1 and an impression cylinder 4. The roll width length Lof the impression cylinder 4 is shorter than the roll width length Lof the plate cylinder 1, and a doctor blade 2 is slidingly arranged along the width direction of the plate surface 11 of the plate cylinder 1 to scrape excessive ink 9 applied on the plate surface 11 of the plate cylinder 1. Both ends 22, 22 of the doctor blade 2 have plate-like members 3, 3 which collect ink 9 wiped off by the doctor blade 2 and prevent ink adhesion onto both ends 12 of the plate cylinder 1 and the side surface 13.

Description

  The present invention relates to a gravure coating apparatus that prevents ink from entering a side surface of a gravure plate cylinder. More specifically, the ink prevents the ink from adhering to the side surface and the base of the gravure plate cylinder and fouling the base film, thereby improving the product quality and reducing the cleaning time of the gravure coating device. The present invention relates to an improved gravure coating apparatus.

In addition, the gravure ink described in this specification (sometimes simply referred to as ink) is a general term for ink in a broad sense applied to a substrate film using a gravure coating apparatus. Is. Specifically, a paint in which a dye or pigment is mixed with a resin composition, a paint comprising an adhesive composition dissolved in a solvent, a paint comprising an adhesive composition, a paint comprising a synthetic resin composition, a metal oxide In the present specification, paints obtained by mixing a compound with a resin composition are collectively referred to as gravure ink or ink.
In addition, the base film described in the present specification refers to a flexible belt-like film made of a thin plate made of wood, a paper base, a plastic sheet, a metal thin plate, and a laminated material thereof. Pointing.

  In a conventional gravure coating apparatus, gravure ink is applied to a plate using a jig that is in sliding contact with non-printed image portions (refer to Patent Documents 1 and 2) or side surfaces (refer to Patent Document 3) at both ends of a gravure plate. Prevents wrapping around and sticking to the side of the body.

JP-A-11-33451 JP 2001-310439 A JP 2006-272710 A

In the above-mentioned Patent Document 1, the ink splash prevention member is fixed to both ends of the blade edge side of the doctor blade and the rear side in the rotation direction of the plate cylinder, scraped off by the doctor blade, and attached to the side surface of the plate cylinder. There has been disclosed a printing apparatus that prevents the ink from splashing and adhering to the plate surface before transfer and soiling the base film.
However, in the printing apparatus described in Patent Document 1, the upper portion of the side surface of the plate cylinder in a range from the position where the excess ink on the plate surface is scraped off by the doctor blade to the position where the ink is transferred to the substrate is used as the plate cylinder. Because of the structure of covering with the ink splash prevention member that is in sliding contact with the magnetic force, the ink adhering to the side surface of the plate cylinder is not removed but accumulated. Therefore, it may not be possible to prevent the ink adhering to the side surface of the plate cylinder from being scattered in front of the position where the ink is scraped off by the doctor blade and directly adhering to the base film. Also, as in the experimental example, using an ink splash prevention film made of polyester and sliding it in contact with the plate cylinder, it becomes charged and dust, dust, etc. adhere to it, or in the case of flammable ink, it is ignited by sparks due to charging. There was a problem of having a risk of doing.

In the above-mentioned Patent Document 2, for the purpose of preventing the ink from flowing around the side surface of the gravure plate cylinder, a strip-shaped piece of paper is formed at the positions of the non-print image portions at both ends of the plate cylinder, There is disclosed a doctor device for preventing contamination on the side of a cylinder, in which the strip upper paper piece wraps the edge of a doctor blade and hangs in a direction opposite to the rotation of the gravure plate cylinder.
However, in the doctor device for preventing dirt on the side surface of the cylinder described in Patent Document 2, the lower side of the strip-shaped paper piece facing the gravure plate due to the rotation of the gravure plate cylinder causes the strip-shaped paper piece to get wet with ink over time. There is a problem that the ink that adheres to the ink drops on both ends of the gravure plate cylinder and the ink wraps around the side surface of the gravure plate cylinder.
Further, in the doctor device for preventing dirt on the side surface of the cylinder described in Patent Document 2, the strip-shaped paper piece may be rubbed out due to friction between the doctor blade and the gravure plate due to the rotation of the gravure plate cylinder. There has been a problem that the ink that has adhered to and accumulated on the lower side of the gravure plate of the paper sheet stains the printed matter.

Patent Document 3 discloses a doctor device including a narrow auxiliary doctor blade that is in sliding contact with a side end portion of a plate surface of a gravure plate cylinder, and a flexible plate-like body that is in sliding contact with a side surface of the gravure plate cylinder. Yes.
However, in the doctor device described in Patent Document 3, the flexible plate-like body, the auxiliary doctor, and the doctor are disposed at different positions, and the ink is scraped off step by step. There is a problem that the ink accumulated in the ink gradually protrudes from both ends of the ink and may turn to the side surface of the gravure plate cylinder.

  The present invention has been made in view of the above circumstances, and prevents ink splashes from both ends of the gravure plate cylinder from fouling the base film, improving the product quality, and improving the ink quality. It is another object of the present invention to provide a gravure coating apparatus that improves productivity by preventing adhesion to a gantry and reducing the cleaning time of the gravure coating apparatus.

  In order to solve the above-mentioned problems, the present invention relaxes physical constraints on the length of the roll width of the plate cylinder and the finisher roll, and the roll of the impression cylinder is compared with the length of the roll width of the plate cylinder. The recovery function of the ink scraped off by the doctor blade on the outer peripheral surface of both ends of the plate cylinder and the prevention of ink from adhering to both ends and sides of the plate cylinder so that the width may be significantly shorter The technical idea is to arrange a plate-like member having both functions.

In order to solve the above-mentioned problems, the present invention provides at least a gravure coating apparatus having a plate cylinder and an impression cylinder, wherein the roll width of the impression cylinder is shorter than the roll width of the plate cylinder. A doctor blade that scrapes off excess ink applied to the plate surface of the plate cylinder is disposed by sliding in the width direction of the plate surface of the plate cylinder, and scraped by the doctor blade at both ends of the doctor blade. In addition, a gravure coating apparatus is provided in which a plate-like member having a function of collecting ink and a function of preventing adhesion of ink to both end portions and side portions of the plate cylinder in the width direction is disposed.
An inking portion in which the plate-like member is notched at the end near the center of the plate cylinder within a certain distance from the lower surface of the doctor blade to the front side in the rotation direction of the plate cylinder. It is preferable to have.
It is preferable that the upper end portion of the ink stopper is in close contact with the lower surface of the doctor blade.
It is preferable that the ink stop portion of the plate-like member has a shape in which an upper end portion is closed by bending, and a side end portion thereof is in close contact with the upper surface of the plate-like member.
The plate cylinder in the range of −90 to 90 °, at least as an angle θ, with respect to the intersection where the line connecting the center axis of the plate cylinder and the impression cylinder intersects the outer peripheral surface of the plate cylinder. It is preferable to cover both the outer peripheral surface and both end portions and side portions in the width direction.
It is preferable that the plate member is made of a material having at least an outer surface having conductivity.

  According to the gravure coating apparatus of the present invention, by suppressing the ink from adhering to both ends and side portions in the width direction of the plate cylinder, conventionally, the ink adhering to such a place is scattered by the rotation of the plate cylinder. It is possible to fundamentally solve the problem of having been done, prevent the base film from being soiled, and improve the product quality. Further, the cleaning time for removing the ink stains attached to the side surface of the plate cylinder, the pedestal or the like is reduced, and the productivity is improved.

1 is a schematic perspective view of a gravure coating apparatus according to the present invention. Fig.2 (a) is the enlarged view of the A section of FIG. 1, Comprising: It is the schematic perspective view which showed an example of the plate-shaped member. FIG. 2B is a cross-sectional view of the plate-like member and the ink stopper at the position of line S2-S2 in FIG. It is the enlarged view of the A section of FIG. 1, Comprising: It is the schematic perspective view which showed another example of the plate-shaped member. Fig.4 (a) is the top view which showed the A section of FIG. 1 from the doctor blade top. FIG. 4B is a cross-sectional view of the plate-like member and the doctor blade at the position of line S4-S4 in FIG. It is a schematic side view which shows the state by which the finisher roll was immersed in the ink stored in the ink pan.

The present invention will be described below with reference to the drawings based on the best mode.
FIG. 1 is a schematic perspective view showing a relative positional relationship between a plate cylinder 1, a doctor blade 2 and a plate-like member 3 in a gravure coating apparatus 10 according to the present invention. Than the length L ₁ of the roll width of the plate cylinder 1, the length L ₂ of the roll width of the impression cylinder 4 is shortened. A doctor blade 2 that scrapes off excess ink 9 applied to the plate surface 11 of the plate cylinder 1 is disposed so as to slide in the width direction of the plate surface 11 of the plate cylinder 1. The ink adhering to the plate surface 11 is conveyed to an upper position toward the doctor blade 2 by the rotation of the plate cylinder 1. Excess ink 9 on the plate surface 11 of the plate cylinder 1 is scraped off by the doctor blade 2, and the impression cylinder 4 is pressed against the plate cylinder 1 through the printing substrate film 5, thereby conveying the mold of the conveyed plate surface 11. The ink stored in the groove is transferred to the printing substrate film 5.
The plate-like member 3 is attached to the left and right side end portions 22 of the doctor blade 2 one by one and is in contact with the outer peripheral end portion 12 of the plate cylinder 1.

The plate-like member 3 shown in FIGS. 2 and 3 is an enlarged view of part A in FIG. 1, and within a certain distance range from the lower surface 21 of the doctor blade 2 to the front side in the rotational direction of the plate cylinder. There are cuts 31a and 31b at the end 3a on the side close to the center of the plate cylinder 1, and ink stoppers 32 and 33 formed by the cuts 31a and 31b are formed by bending. The ink stoppers 32 and 33 prevent the ink 9 scraped off by the doctor blade 2 from moving to the side end 22 of the doctor blade 2.
In FIG. 5, at least an angle θ of −90 to 90 ° with respect to a point P where a line 14 connecting the center axes 1 a and 4 a of the plate cylinder 1 and the impression cylinder 4 intersects the outer peripheral surface of the plate cylinder 1. Since the plate-like member 3 covers the outer peripheral surface end 12 and the side surface 13 of the plate cylinder 1 in the range (see FIG. 1), the ink scatters in the direction of the impression cylinder 4 or the printing substrate film 5. Can be prevented.

As shown in FIGS. 2 and 3, the plate-like member 3 is provided with two cuts 31 a and 31 b at the end 3 a near the center of the plate cylinder 1, and of these, the cut 31 b on the doctor blade 2 side. Is extended to the length of the side end portion 22 of the doctor blade 2 located outside the end portion of the plate cylinder 1 to form an insertion portion 34, and this insertion portion 34 is inserted into the doctor blade 2. As shown in FIGS. 4A and 4B, the plate-like member 3 exists at the end portion of the plate cylinder 1 with the doctor blade 2 interposed therebetween. This prevents the plate-like member 3 from being bitten between the plate cylinder 1 and the doctor blade 2 when the doctor blade 2 is swung left and right with respect to the axial direction of the plate cylinder 1. Yes.
The ink scraped off by the doctor blade 2 is dammed up by the ink stoppers 32 and 33 having the above-mentioned triangular prism or flat plate-like structure of the plate-like member 3, falls down along the plate-like member 3, and drops into the ink pan 7. To be recovered. The plate-like member 3 stops the scraped ink 9 from moving to the side end portion 22 of the doctor blade 2 and drops it down without adhering to the both end portions 12 and the side surface portions 13 of the plate cylinder 1. It has a function. The structure of the ink stopper is not particularly limited, and may be a quadrangular prism shape, a cylindrical shape, or the like.
The width of the insertion part 34 is about the thickness of the doctor blade 2 or less. When the material of the plate-like member 3 is thin, such as a paper substrate or a plastic sheet, and has a deformability that allows the doctor blade 2 to be press-fitted, a linear cut may be used.

Since the side end portion 22 of the doctor blade 2 extends to the outside of the ink stoppers 32 and 33 on the plate-like member 3, the ink 9 scraped by the doctor blade 2 accumulates at the cutting edge of the doctor blade 2. As a result, it gradually moves toward the side end 22 of the doctor blade 2, but is blocked by the ink stopper 32 of the plate member 3, and the ink 9 falls along the plate member 3 and is returned to the ink pan 7. . The upper end portions 32a and 33a of the ink stoppers 32 and 33 are preferably in close contact with the lower surface 21 of the doctor blade 2, but if the gap is a small gap of 1 mm or less, the ink 9 is the side end portion 22 of the doctor blade 2. There is no flow to the.
As shown in FIGS. 2A and 2B, the ink stopper 32 of the plate-like member 3 has a shape in which the upper end 32a is closed by bending, such as a triangular prism shape, a quadrangular prism shape, a cylindrical shape, etc. When the side end 32b of the stopper 32 is in close contact with the upper surface 3c of the plate member 3, even if some ink leaks outward from between the upper end 32a and the doctor blade 2, the plate member 3 The side end portion 32b in close contact with the upper surface 3c is preferably dammed so that the ink does not move outward, and the ink can be flowed downward and collected through the inside 32c, which is preferable.

  There is no restriction | limiting in particular in the material of the plate-shaped member 3, A timber thin board, a paper base material, a plastic sheet | seat, a metal thin plate, those laminated materials, etc. can be used. Moreover, it is preferable that the plate-shaped member 3 has a corrosion resistance so that it does not corrode even if it contacts with moisture in the case of water-based gravure ink. In addition, the plate-like member 3 is preferably conductive so that it is not charged and dust, dust and the like are attached, and in the case of combustible ink, it is not ignited by sparks due to charging. Further, when the plate-like member 3 is made of a material having no conductivity, for example, a metal foil may be laminated on the surface of the plate-like member 3 or a metal plating layer may be laminated.

Specifically, the plate-like member 3 is made of a metal thin plate such as stainless steel, aluminum or nickel, or a metal thin plate such as steel from the viewpoint of mechanical strength and corrosion resistance, such as nickel plating, chrome plating, or nickel-chromium. It is preferable to laminate a corrosion-resistant metal plating layer. In this invention, what laminated | stacked metal foil on the thin paper as a material of the plate-shaped member 3 can be used conveniently. Moreover, it is preferable that the vertical and horizontal dimensions of the plate-like member 3 are appropriately determined according to the outer diameter dimensions of the plate cylinder 1 and the impression cylinder 4. The width of the plate member 3 is preferably 0.1 to 0.5 cm from the side surface 41 of the impression cylinder 4 at the inner end portion 3a, and 1 to 5 cm from the side surface 13 of the plate cylinder 1 at the outer end portion 3b. Is preferred. By bringing the inner end 3 a of the plate-like member 3 as close as possible without touching the impression cylinder 4, the area where the plate-like member 3 and the plate cylinder 1 overlap increases, and the plate-like member 3 supports the plate cylinder 1. It becomes easy to fix the plate-like member 3 to the doctor blade 2. The method for fixing the plate-like member 3 to the doctor blade 2 is not particularly limited, and examples thereof include a method of attaching the back surface of the doctor blade 2 and the upper surface of the plate-like member 3 with an adhesive tape.
It is preferable that the outer end 3 b of the plate-like member 3 is as short as possible within a range in which ink does not adhere to the side surface 13 of the plate cylinder 1 and ink droplets do not fly in the direction of the impression cylinder 4. If the plate-like member 3 is too long, the center of gravity of the plate-like member 3 is closer to the outside, and the plate-like member 3 may be lifted from or removed from the plate cylinder 1, which is not preferable.
In addition, the thickness when a thin metal plate is used for the plate-like member 3 needs to be determined in consideration of mechanical strength depending on the material of the metal plate, but the general thickness is about 0.1 mm to 5 mm. is there.

FIG. 5 is a schematic side view showing a state in which the finisher roll 6 is immersed in the ink 8 stored in the ink pan 7. The plate cylinder 1 and the finisher roll 6 are closest to each other at a point where a straight line 16 connecting the plate cylinder 1 and the central axes 1a and 6a of the finisher roll 6 intersects the outer periphery of the plate cylinder 1 and the finisher roll 6. This is the location Q. The ink 8 stored in the ink pan 7 is pumped up while adhering to the outer peripheral surface of the finisher roll 6 as the finisher roll 6 rotates, and the plate cylinder 1 and the finisher roll 6 are closest to each other. The ink reservoir 15 is formed by moving to the location Q. The ink that has passed through the ink reservoir 15 and has adhered to the plate cylinder 1 is scraped off by the doctor blade 2. The scraped ink 9 accumulated in the doctor blade 2 spreads in the width direction of the plate cylinder 1, but is dammed up by the ink stopper 32 of the plate member 3, and travels downward through the plate member 3. It falls and is collected in the ink pan 7.
5, the central axis 1a of the plate cylinder 1 and the impression cylinder 4, a reference line 14 that connects 4a is a point P intersects the outer peripheral surface of the plate cylinder 1, as at least the angle theta, the front side theta ₁ and the rotational direction In each of the rear side θ ₂ , a range of −90 to 90 ° needs to be covered with the plate-like member 3. The angle θ ₁ on the front side in the rotation direction can be extended until the lower end of the plate-like member 3 reaches the ink pan 7. The angle θ ₂ on the rear side in the rotation direction can be extended to a position where the plate-like member 3 does not hinder the operation of the finisher roll 6. At a position lower than the central axis 1 a of the plate cylinder 1, the plate-like member 3 may be suspended from the plate surface 11.

(Plate cylinder)
The surface of the plate cylinder 1 is provided with a gravure plate in which a mold groove having a fine line pattern is formed. The fine line pattern is a character, a symbol, a figure, a combination thereof, or the like, and a specific pattern is used depending on the application.
The gravure plate is made of an iron cylinder, and the surface is plated with copper, and the target design pattern is formed on the surface of the plated copper with a diamond single-head electronic engraving machine. The blade 2a of the doctor blade 2 is pressed against a gravure plate disposed on the surface of the plate cylinder 1, and gravure ink is pressed into a mold groove formed on the surface of the gravure plate. The gravure ink is supplied by pumping ink 8 stored in an ink pan 7 on the surface of the finisher roll 6 as shown in FIG.
The gravure plate is formed on the surface of the plate cylinder 1, and the mold groove of the gravure plate is formed in a pattern corresponding to the fine line pattern transferred to the base film. The gravure ink press-fitted into the mold groove is transferred to the printing substrate film 5 when it comes into contact with the printing substrate film 5.

(Gravure ink)
The gravure ink or ink described in this specification is a general term for paints (inks) in a broad sense that are applied (coated) to a substrate using a gravure coating apparatus. Specifically, a paint in which a dye or pigment is mixed with a resin composition, a paint comprising an adhesive composition dissolved in a solvent, a paint comprising an adhesive composition, a paint comprising a synthetic resin composition, a metal oxide In the present specification, various paints used for various purposes such as a paint obtained by mixing a compound with a resin composition are collectively referred to as gravure ink or ink.
For example, when a conductive paste is used as gravure ink to form a conductive circuit on the surface of a base film, a conductive paste in which a conductive filler is mixed with a resin component as a binder is usually used as a paint. It is done. The conductive paste preferably contains one or more selected from the group of conductive fillers composed of conductive metal particles, carbon nanotubes, and carbon nanofibers. As the conductive metal particles, metal powders such as copper, silver, nickel, and aluminum are used. From the viewpoint of conductivity and cost, it is preferable to use copper or silver fine powder. In addition, carbon nanotubes and carbon nanofibers that are conductive carbon nanoparticles can also be used.

  According to the present invention, in the gravure coating apparatus having at least a plate cylinder and an impression cylinder, the plate-like member for guiding the ink moving downward along the doctor blade to the end in the width direction is disposed. Even when the roll width of the impression cylinder is shorter than the roll width of the cylinder, the ink is prevented from adhering to both ends in the width direction of the plate cylinder, and the ink splashes are Productivity is improved by preventing contamination of the base film, improving product quality, and preventing ink from adhering to the side and base of the plate cylinder and reducing the cleaning time of the gravure coating device. An improved gravure coating apparatus is provided.

L ₁ ... Length of roll width of plate cylinder, L ₂ ... Length of roll width of impression cylinder, 1 ... Plate cylinder, 2 ... Doctor blade, 3 ... Plate member, 4 ... Impression cylinder, 5 ... Printing substrate Film, 6 ... Furnisher roll, 7 ... Ink pan, 8 ... Ink, 10 ... Gravure coating device, 11 ... Plate surface, 12 ... Both ends of plate cylinder in width direction, 13 ... Side surface of plate cylinder, 21 ... Doctor blade , 31a, 31b ... notches, 32, 33 ... ink stop, 32a, 33a ... upper end of the ink stop.

Claims (6)

  At least, in a gravure coating apparatus having a plate cylinder and an impression cylinder, the roll width of the impression cylinder is shorter than the roll width of the plate cylinder, and the excess applied to the plate surface of the plate cylinder A doctor blade that scrapes off the ink is disposed so as to slide in the width direction of the plate surface of the plate cylinder, and the recovery function of the ink scraped by the doctor blade at both ends of the doctor blade, and the plate cylinder A gravure coating apparatus comprising a plate-like member having a function of preventing adhesion of ink to both end portions in the width direction and side portions.   An inking portion in which the plate-like member is notched at the end near the center of the plate cylinder within a certain distance from the lower surface of the doctor blade to the front side in the rotation direction of the plate cylinder. The gravure coating apparatus according to claim 1, comprising:   The gravure coating apparatus according to claim 2, wherein an upper end portion of the ink stopper is in close contact with a lower surface of the doctor blade.   The ink stop portion of the plate-like member has a shape in which an upper end portion is closed by bending, and a side end portion thereof is in close contact with the upper surface of the plate-like member. Gravure coating device.   The plate cylinder in the range of −90 to 90 °, at least as an angle θ, with respect to the intersection where the line connecting the center axis of the plate cylinder and the impression cylinder intersects the outer peripheral surface of the plate cylinder. The gravure coating apparatus according to any one of claims 1 to 4, wherein the gravure coating apparatus covers the outer peripheral surface of the substrate and both end portions and side portions in the width direction.   The gravure coating apparatus according to claim 1, wherein the plate member is made of a material having at least an outer surface having conductivity.

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