JP2014226636A - Print-coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a print-coating device capable of adhering a transfer liquid such as a coating liquid or ink homogeneously to a wide web when the transfer liquid is transferred to the wide web.SOLUTION: A portion of a gravure roll 2 is dipped in a coating liquid 13 contained in a liquid sump part 31 of a chamber 3. On the two sides of the roll radial direction of the gravure roll 2, a doctor blade 4 and a first seal plate 5 are pressure-welded to the gravure toll 2 while opposing from the two sides of the roll radial direction. The length of the gravure roll 2 in the roll axial center direction is two times as long as of a roll outer diameter D. Each second seal plate 6 is pressure-welded to the two outer end face parts 2b of the roll axis direction of the gravure roll 2.

Description

  The present invention relates to a printing coating apparatus that transfers a transfer liquid such as a coating liquid or ink onto a continuously conveyed web.

  Conventionally, for example, the coating apparatus of Patent Document 1 includes a gravure roll (coating roll) and a coating chamber having a liquid reservoir that accommodates a part of the gravure roll, and a doctor blade and a first seal. The plate is opposed to the gravure roll above and below the gravure roll and pressed against the gravure roll, and the pair of second seal plates are pressed against the outer peripheral surfaces on both sides in the roll axial direction of the gravure roll to seal the liquid reservoir. Yes. And the said coating apparatus scrapes off an excess coating liquid with the said doctor blade by rotation operation of a gravure roll, and coats the measured coating liquid on the web conveyed.

  By the way, when applying a coating liquid to a wide web, the length of the gravure roll in the roll axis direction is naturally increased.

JP 2010-69829 A (paragraphs 0016 to 0023, FIGS. 1 to 9)

  However, when the gravure rolls are pressed against each other in the roll axial center direction by a pair of second seal plates as in Patent Document 1, the long gravure roll is bent into an arcuate shape. When the gravure roll is bent in this manner, the contact state of the outer peripheral surface of the gravure roll with respect to the web varies in the roll rotation axis direction, and the coating liquid cannot be uniformly adhered to the web.

  Also in the printing apparatus, when the length of the gravure roll (plate cylinder) in the roll axis direction is increased, unevenness occurs in the ink adhered to the web.

  The present invention has been made in view of such a point, and an object of the present invention is to uniformly attach a transfer liquid to a web when transferring a transfer liquid such as a coating liquid or ink to a wide web. It is in providing the printing coating apparatus which can do.

  In order to achieve the above object, the present invention is characterized in that both of the second seal plates are not pressed against the outer peripheral surface of the gravure roll.

  Specifically, the gravure is formed by facing the doctor blade and the first seal plate from both sides in the roll radial direction on both sides in the roll radial direction of the gravure roll partially immersed in the transfer liquid stored in the liquid reservoir of the chamber. A printing coating apparatus in which the liquid reservoir is hermetically sealed by pressing a pair of second seal plates on both sides in the roll axial direction of the gravure roll, and the following solution is provided. I took it.

  That is, in the first invention, the length of the gravure roll in the roll axis direction is at least twice the roll outer diameter, and each of the second seal plates is on both end surfaces of the gravure roll in the roll axis direction. It is characterized by being in pressure contact.

  According to a second invention, in the first invention, the inner end surface portion on the inner side in the roll radial direction is located outside the outer end surface portion on the outer side in the roll radial direction on both ends of the gravure roll in the roll axial direction. A stepped portion concentric with the roll axis is formed between the two, and the tip of each second seal plate is in contact with the stepped portion.

  According to a third invention, in the first or second invention, the second seal plate can be adjusted in position in the roll axis direction according to the length of the gravure roll in the roll axis direction. To do.

  In the first invention, since both the second seal plates are not brought into pressure contact with the outer peripheral surface of the gravure roll, even if the length of the gravure roll in the roll rotation axis direction is increased, There is no bending. Therefore, the contact state of the outer peripheral surface of the gravure roll with respect to the web is less likely to vary in the roll rotation axis direction, and the transfer liquid can be uniformly attached when the transfer liquid is transferred to the web.

  In the second invention, since both the second seal plates can be positioned at regular positions with respect to the gravure roll, it is ensured that the sealed state of the liquid reservoir is stable and the transfer liquid leaks from the liquid reservoir during transfer. Can be prevented.

  In the third invention, since the length between the two second seal plates can be changed, even if the type of the gravure roll is changed, the second seal plate is reliably pressed against the end surface in the roll axial direction of the gravure roll. The reservoir can be sealed.

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. It is a schematic perspective view of the coating apparatus which concerns on Embodiment 2 of this 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
1 to 3 illustrate a coating apparatus 1 as a print coating apparatus according to an embodiment of the present invention. The coating apparatus 1 performs coating on a web 10 guided by a plurality of guide rolls 11 (only two are shown in FIG. 1) and fed in the upward direction (conveying direction X1 in FIG. 1).

  The coating apparatus 1 includes an iron gravure roll 2 (coating roll) that is rotatably supported on the apparatus fixing side 12 by a pair of rotating shafts 14, and the gravure roll 2 is applied to the outer peripheral surface. The working liquid 13 (transfer liquid) is transferred to the web 10 by a rotating operation.

  The length L of the gravure roll 2 in the roll axis direction is at least twice the roll outer diameter D. Specifically, the length L is 600 mm to 3000 mm, and the roll outer diameter D is 60 mm to 300 mm. Is set to

  On the end surface 20 of the gravure roll 2 in the roll axis direction, an inner end surface portion 2a on the inner side in the roll radial direction protrudes outward in the roll axis direction from the outer end surface portion 2b on the outer side in the roll radial direction. Concentric steps 2c are formed.

  On one side of the gravure roll 2 in the roll radial direction, a substantially rectangular parallelepiped chamber 3 extending in the roll rotation axis direction of the gravure roll 2 is provided, and the chamber 3 is in contact with the gravure roll 2. It is possible to separate.

  The chamber 3 is provided with a liquid reservoir 31 having a U-shaped cross section that opens toward the gravure roll 2, and the coating liquid 13 accommodated in the liquid reservoir 31 is provided with one outer peripheral surface of the gravure roll 2. The part is immersed.

  An inflow passage 32 through which the coating liquid 13 flows into the liquid reservoir 31 is provided at the lower center of the back side of the chamber 3, and the coating liquid 13 is placed near both upper ends of the back side of the chamber 3. A pair of outflow passages 33 for flowing out from the liquid reservoir 31 are provided, and the coating liquid 13 stored in the liquid reservoir 31 is passed through the inflow passage 32 and the outflow passage 33 by a coating liquid circulation device (not shown). Circulating.

  On the upper part of the chamber 3 (one side in the radial direction of the gravure roll 2), a plate-shaped stainless steel doctor blade 4 is provided projecting downward from the peripheral edge of the upper end of the liquid reservoir 31, and the doctor blade 4 is The gravure roll 2 is pressed against the outer peripheral surface to seal the downstream side in the roll rotation direction of the liquid reservoir 31, and the rotation of the gravure roll 2 causes the tip of the doctor blade 4 to come to the outer peripheral surface of the gravure roll 2. The excess coating liquid 13 is scraped off and scraped off from the outer peripheral surface of the gravure roll 2 to measure the coating liquid 13 according to the purpose of coating.

  On the other hand, in the lower part of the chamber 3 (in the radial direction of the gravure roll 2 and on the opposite side of the doctor blade 4), a plate-shaped resin-made first seal plate 5 extends upward from the peripheral edge of the lower end of the opening of the liquid reservoir 31 It protrudes toward you.

  The first seal plate 5 faces the doctor blade 4 and is in pressure contact with the outer peripheral surface of the gravure roll 2 to seal the upstream side of the liquid reservoir 31 in the roll rotation direction.

  Furthermore, resin-made second seal plates 6 made of polyethylene are attached to both ends of the chamber 3 in the roll axis direction.

  The gravure roll 2 side of the second seal plate 6 has a mountain shape whose vertical length decreases as it goes to the gravure roll 2 side. A curved recess 6a located on the side is curved.

  That is, protrusions 6b that protrude toward the gravure roll 2 are provided on both upper and lower sides of the curved recess 6a. When the type of the gravure roll 2 is changed, the chamber 3 is brought closer to the gravure roll 2. The tip of each protrusion 6b comes into contact with the step 2c of the gravure roll 2 while the second seal plate 6 is in sliding contact with the end surface of the gravure roll 2 in the roll axis direction.

  The second seal plate 6 presses the outer end surface 2b of the gravure roll 2 in a state where the tip of each protrusion 6b of the second seal plate 6 is in contact with the step 2c of the gravure roll 2. Thus, the liquid reservoir 31 is sealed with the doctor blade 4, the first seal plate 5, and both the second seal plates 6.

  As described above, according to the first embodiment of the present invention, both the second seal plates 6 are not brought into pressure contact with the outer peripheral surface of the gravure roll 2, so that both the second gravure rolls 2 even if the length in the roll rotation axis direction is increased. The bending of the gravure roll 2 due to the seal plate 6 is eliminated. Accordingly, the contact state of the outer peripheral surface of the gravure roll 2 with respect to the web 10 is less likely to vary in the roll rotation axis direction, and the coating liquid can be uniformly attached when the coating liquid 13 is applied to the web 10.

Moreover, since both the 2nd seal plates 6 can be positioned in a regular position with respect to the gravure roll 2, the sealing state of the liquid reservoir 31 is stable, and the coating liquid leaks from the liquid reservoir 31 during coating. Can be surely prevented.
<< Embodiment 2 of the Invention >>
FIG. 4 shows a coating apparatus 1 according to Embodiment 2 of the present invention. The second embodiment is the same as the first embodiment except that the gravure roll 2 has no step 2c, a partial structure of the chamber 3, and the second seal plate 6 are different from the first embodiment. Hereinafter, only the parts different from the first embodiment will be described.

  The liquid reservoir 31 of the chamber 3 of the second embodiment extends along the roll axial direction and is open to both ends of the roll axial center. A pair of concave grooves 31a recessed downward is formed.

  On the other hand, on the anti-gravure roll side of the second seal plate 6 of the second embodiment, a pair of overhanging portions 61 are provided to protrude vertically, and each overhanging portion 61 corresponds to each of the groove grooves 31a. doing.

  The second seal plate 6 is fitted to the liquid reservoir 31 in the roll axis direction.

  Fixing tools 9 for fixing the second seal plate 6 to the chamber 3 are provided on each end face of the chamber 3 in the roll axis direction.

  The fixture 9 is provided with a pair of rectangular blocks 7 projecting from the upper and lower sides of each end surface in the roll axis direction of the chamber 3 and a rotating rod 8 extending vertically.

  Each rectangular block 7 is provided with a through hole 7a penetrating vertically, and a female screw is threaded on the inner peripheral surface of the through hole 7a.

  The rotating rod 8 has a hexagonal section of the rotary operation portion 8a with the rotation axis oriented vertically, and protrudes from the upper and lower ends of the rotation operation portion 8a, and is concentric with the rotation axis of the rotation operation portion 8a. A pair of shaft portions 8b are provided, and male screws in opposite directions are threaded on the outer peripheral surface of each shaft portion 8b.

  The shaft portions 8b are screwed into the through holes 7a of the rectangular blocks 7, and when the rotation operation portion 8a is rotated to one side by a spanner (not shown), the rectangular blocks 7 are separated from each other. As a result, the upper portion and the lower portion of the chamber 3 are separated from each other, and the second seal plate 6 can be moved in the roll axis direction with respect to the chamber 3, while the rotation operation portion 8a is moved to the other side. When the two rectangular blocks 7 approach each other, the upper part and the lower part of the chamber 3 approach each other, and the second seal plate 6 is moved to the upper part and the lower part of the chamber 3. It is sandwiched so that it cannot move in the roll axis direction.

  That is, the position of the second seal plate 6 can be adjusted in the roll axis direction according to the length of the gravure roll 2 in the roll axis direction.

  Therefore, according to Embodiment 2 of the present invention, the length between the second seal plates 6 can be changed, so that even if the type of the gravure roll 2 is changed, the second end of the gravure roll 2 on the end surface 20 in the roll axis direction. The liquid reservoir 31 can be sealed by reliably bringing the seal plate 6 into pressure contact.

  In the first and second embodiments of the present invention, the gravure roll 2 is made of iron, but may be formed of a stainless steel material or a resin material.

  In the first and second embodiments of the present invention, the first 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.

  The doctor blade 4 is made of stainless steel, but may be made of other materials, for example, iron, resin, or rubber. Moreover, you may use what gave the ceramic coat | court to the metal.

  Moreover, the structure applied to the coating apparatus 1 in Embodiments 1 and 2 of the present invention can also be used in a printing apparatus that performs printing on the web 10.

  The present invention is suitable for a printing coating apparatus that transfers a transfer liquid such as a coating liquid or ink onto a continuously conveyed web.

1 Coating device (printing coating device)
2 Gravure roll 2a Inner end face part of gravure roll 2b Outer end face part of gravure roll 2c Step part of gravure roll 3 Chamber 4 Doctor blade 5 First seal plate 6 Second seal plate 10 Web 13 Coating liquid (transfer liquid)
20 End surface in the roll axis direction of the gravure roll 31 Liquid reservoir L Length of the gravure roll in the roll axis direction D Roll outer diameter of the gravure roll

Claims (3)

The doctor blade and the first seal plate are opposed to the gravure roll on both sides in the roll radial direction of the gravure roll partially immersed in the transfer liquid accommodated in the liquid reservoir of the chamber, and pressed against the gravure roll. A printing coating apparatus in which the pair of second seal plates are brought into pressure contact with both sides of the gravure roll in the roll axial direction, and the liquid reservoir is sealed,
The length of the gravure roll in the roll axis direction is at least twice the roll outer diameter,
Each said 2nd seal plate is press-contacted to the roll axial center both ends surface of the said gravure roll, The printing coating apparatus characterized by the above-mentioned. In the printing coating apparatus according to claim 1,
On both end surfaces in the roll axis direction of the gravure roll, an inner end surface portion on the inner side in the roll radial direction protrudes outward in the roll axis direction from an outer end surface portion on the outer side in the roll radial direction, and is concentric with the roll axis therebetween. A printing coating apparatus, wherein a step portion is formed, and the tip of each of the second seal plates is in contact with the step portion. In the printing coating apparatus according to claim 1 or 2,
The print coating apparatus, wherein the position of the second seal plate can be adjusted in the roll axis direction according to the length of the gravure roll in the roll axis direction.

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