JP4687313B2 - Coating equipment - Google Patents

Description

  The present invention relates to a coating apparatus that coats various coating liquids on a substrate.

When a coating liquid containing various resin components is applied to a substrate using a cylindrical gravure cylinder plate, the coating liquid is always exposed to the outside air in a coating device with the coating part open. As a result, the solvents used in the coating liquid volatilize during coating, and it is difficult to obtain a certain quality due to fluctuations in the viscosity of the coating liquid. Furthermore, there are various problems such as a large amount of coating liquid splashing and polluting the working environment, and there are many cloggings in the cells of the cylindrical gravure cylinder plate, and the coating amount is not stable. In recent years, in order to remedy these problems, a coating device has been proposed in which a chamber doctor with two upper and lower doctor blades is closely fitted to a cylindrical gravure cylinder plate and can be applied in a closed state during coating. (For example, refer to Patent Document 1).
Japanese Patent No. 3542772

  However, in the proposed coating apparatus, the diameter of the cylindrical gravure cylinder plate to be used is limited to 40 to 55 mm. When a cylindrical gravure cylinder plate having a diameter of less than 40 mm is used, the coating liquid is scraped off. When a defect occurred or a cylindrical gravure cylinder plate having a diameter exceeding 55 mm was used, there were problems such as the coating surface being roughened.

  An object of the present invention is a coating apparatus that closely applies a chamber doctor to a cylindrical gravure cylinder plate and coats the chamber doctor, even if the diameter of the cylindrical gravure cylinder plate to be used changes within a range of, for example, 50 to 1000 mm. An object of the present invention is to provide a coating apparatus that can be easily applied, enables stable coating, and enables coating suitable for the properties of the coating liquid.

The invention according to claim 1 of the present invention includes an impression roll for press-bonding a base material, a cylindrical gravure cylinder plate having a large number of cells for applying a coating liquid to the base material, and a cylindrical gravure cylinder. In a coating apparatus having a chamber doctor in close contact with the curved surface of the plate, the chamber doctor can slide between the coating liquid circulation supply case and the coating liquid circulation supply case. A case holder and a doctor blade attached to the tip of the case holder,
The coating liquid circulation supply housing has a concave portion on the upper and lower sides through a central partition, and the coating liquid is returned to the coating liquid supply means from the concave portion in the upper concave portion. is 1 or more liquid discharge holes provided for causing, in the recessed portion of the lower provided one or more liquid injection hole for supplying the coating liquid from the coating liquid supplying means to the recess viewed portion Rutotomoni, the Side walls for sealing the liquid reservoir are provided on both sides of the coating liquid circulation supply housing .
This chamber doctor is placed with the dent side of the coating liquid circulation supply housing facing the cylindrical gravure cylinder plate, and the doctor blade is attached in close contact with the curved surface of the cylindrical gravure cylinder plate,
A coating apparatus is characterized in that a liquid reservoir is formed by a cylindrical gravure cylinder plate surface, a recessed portion side and both side walls of a coating liquid circulation supply housing, a doctor blade, and a housing holder.

The coating apparatus of the present invention includes an impression roll for press-bonding a base material, a cylindrical gravure cylinder plate having a number of cells for applying a coating liquid to the base material, and a curvature of the cylindrical gravure cylinder plate. In a coating apparatus provided with a chamber doctor in close contact with the surface, the chamber doctor is slidable with respect to the coating liquid circulation supply casing, and the casing can hold the coating liquid circulation supply casing It consists of a holding tool and a doctor blade attached to the tip of the housing holding tool,
The coating liquid circulation supply housing has a concave portion on the upper and lower sides through a central partition, and the coating liquid is returned to the coating liquid supply means from the concave portion in the upper concave portion. is 1 or more liquid discharge holes provided for causing, in the recessed portion of the lower provided one or more liquid injection hole for supplying the coating liquid from the coating liquid supplying means to the recess viewed portion Rutotomoni, the Side walls for sealing the liquid reservoir are provided on both sides of the coating liquid circulation supply housing .
This chamber doctor is placed with the dent side of the coating liquid circulation supply housing facing the cylindrical gravure cylinder plate, and the doctor blade is attached in close contact with the curved surface of the cylindrical gravure cylinder plate,
Since the liquid reservoir is formed by the surface of the cylindrical gravure cylinder plate, the concave side of the coating liquid circulation supply housing, the doctor blade and the housing holder, the diameter of the cylindrical gravure cylinder plate to be used and the Select a coating liquid circulation supply housing of the appropriate size and shape according to the type of coating liquid, and use the housing holder that has a doctor blade at the tip of the coating liquid circulation supply housing. It can be easily handled by forming a liquid reservoir with the cylindrical gravure cylinder plate surface, the dent side and both side walls of the coating liquid circulation supply housing, doctor blade and housing holder. Stable quality coating is possible.

  Hereinafter, the coating apparatus of this invention is demonstrated in detail along embodiment. FIG. 1A is a schematic diagram showing an embodiment of a coating apparatus of the present invention, and FIG. 1B is an explanatory diagram for explaining in detail the structure of a coating liquid circulation supply housing of the coating apparatus. is there.

  The coating apparatus of the present invention will be described in more detail. The coating apparatus (1) includes an impression roll (2) for press-bonding the base material (40) to the cylindrical gravure cylinder plate (3), and the base material (40). Close contact with the curved surface of the cylindrical gravure cylinder plate (3) having a large number of cells (3a) having a fixed shape on the outer surface for coating the coating liquid (41) on the outer surface, and the cylindrical gravure cylinder plate (3) The chamber doctor (10), and the chamber doctor (10) applies the coating liquid (41) to the recess (23) above the central partition (21) as a coating liquid supply means. Liquid discharge holes (25a, 25b, 25c) for refluxing are provided in the width direction, and liquid injection holes for supplying the coating liquid (41) from the coating liquid supply means to the lower recess (22). Coating provided with parts (24a, 24b, 24c) A circulation supply housing (20), two vertically movable housing holders (12, 13) having one end connected to both sides of the air cylinder (11), and the housing holder (12, 13) of the air cylinder (11) and a doctor blade (14, 15) attached to the tip opposite to the air cylinder (11), and the recess (22, 23) side of the coating liquid circulation supply housing (20) The cylindrical gravure cylinder plate (3) is disposed toward the cylindrical gravure cylinder plate (3), and the doctor blade (14, 15) is attached in close contact with the curved surface of the cylindrical gravure cylinder plate (3). The liquid reservoir (30) is formed by the surface of the plate (3), the recess (22, 23) side of the coating liquid circulation supply housing (20), the doctor blade (14, 15), and the housing holder (12, 13). ) Is formed.

In addition, it is necessary to provide the side wall part for sealing a liquid pool part (30) in the both sides | surfaces of the said coating liquid circulation supply housing | casing (20) .

  The lower recess (22) has a shape that allows the coating liquid (41) to easily enter the cell (3a), and the upper recess (23) improves the flow of the coating liquid (41). In order to prevent the generation of bubbles, it is preferable to make the size larger than the lower depression (22).

  The liquid injection hole portions (24a, 24b, 24c) and the liquid discharge hole portions (25a, 25b, 24c) are connected to the coating liquid supply means, respectively, although not shown.

  The coating method of the coating liquid (41) will be briefly described below. The coating liquid (41) supplied from the liquid injection hole of the lower dent (22) is pushed into the cell (3a). As the cylindrical gravure cylinder plate (3) rotates, it is transported upward, and the excess doctor liquid (41) is scraped off by the upper doctor blade (14) and remains in the cell (3a). The coating liquid (41) is transferred to the surface of the substrate (40) at the contact portion with the impression roll (2). Further, the scraped coating liquid (41) is discharged from the liquid discharge hole of the upper dent (23) and refluxed.

  The coating liquid circulation supply housing (20) is made of a metal material or a plastic material, and the plastic material may be a resin that is transparent and easily processed into various shapes, for example, an acrylic resin. By making it transparent, the inside of the chamber doctor (10) can be observed from the outside, and the adjustment of the coating conditions is facilitated. When the coating liquid circulation supply housing (20) is made of a metal material, a part thereof may be cut out and covered with a transparent material so that the inside can be observed.

  Although the said base material (40) is not specifically limited, Various plastic films, paper, aluminum foil, the laminated material on which these were laminated | stacked, etc. can be used, and a rolled-up thing is used normally.

  As the coating liquid (41), various inks and coating liquids containing various resins as main components and other various additives and dissolved or dispersed in a solvent can be used.

  The present invention can be applied to various coating methods such as reverse coating and gravure offset printing in addition to the normal gravure printing method described above and illustrated.

  Since the coating apparatus of the present invention has the structure as described above, the coating liquid circulation supply having a size that matches the diameter of the cylindrical gravure cylinder plate and the fluidity of the coating liquid to be used. Various housings can be prepared in advance, and by using different coating liquid circulation supply housings, changing the set is easy and production efficiency is improved, and foaming of coating liquid is reduced and stable. It has the characteristics that it can be applied in quality and can be used for a wide variety of applications.

(A) is schematic which shows one Embodiment of the coating device of this invention, (b) is structure explanatory drawing of the coating liquid circulation supply housing | casing of the said coating device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Coating apparatus 2 ... Impression roll 3 ... Cylindrical gravure cylinder plate 3a ... Plate cell 10 ... Chamber doctor 11 ... Air cylinder 12, 13 ... Case holder 14, 15 ... Doctor blade 20 ... Coating liquid circulation Supply housing 21 ... partitions 22, 23 ... dents 24a, 24b, 24c ... liquid injection holes 25a, 25b, 25c ... liquid discharge holes 30 ... liquid reservoir 40 ... base material 41 ... coating liquid

Claims (1)

An impression roll for crimping the substrate, a cylindrical gravure cylinder plate having a large number of cells for applying a coating liquid to the substrate, and a chamber doctor in close contact with the curved surface of the cylindrical gravure cylinder plate In the coating apparatus provided, the chamber doctor includes a coating liquid circulation supply housing, a housing holder that can slide between the coating liquid circulation supply housings, and the housing It consists of a doctor blade attached to the tip of the holder,
The coating liquid circulation supply housing has a concave portion on the upper and lower sides through a central partition, and the coating liquid is returned to the coating liquid supply means from the concave portion in the upper concave portion. is 1 or more liquid discharge holes provided for causing, in the recessed portion of the lower provided one or more liquid injection hole for supplying the coating liquid from the coating liquid supplying means to the recess viewed portion Rutotomoni, the Side walls for sealing the liquid reservoir are provided on both sides of the coating liquid circulation supply housing .
This chamber doctor is placed with the dent side of the coating liquid circulation supply housing facing the cylindrical gravure cylinder plate, and the doctor blade is attached in close contact with the curved surface of the cylindrical gravure cylinder plate,
A coating apparatus, wherein a liquid reservoir is formed by a cylindrical gravure cylinder plate surface, a recessed portion side and both side walls of a coating liquid circulation supply housing, a doctor blade, and a housing holding tool.

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