WO1992005033A1

WO1992005033A1 - Device for making cylinder for gravure printing and method of smoothing said cylinder

Info

Publication number: WO1992005033A1
Application number: PCT/JP1991/001200
Authority: WO
Inventors: Yasuaki Machida; Keiichi Suzuki; Tatsufumi Kayano
Original assignee: Toyo Ink Manufacturing Co., Ltd.
Priority date: 1990-04-14
Filing date: 1991-09-10
Publication date: 1992-04-02

Abstract

A device for making a cylinder for gravure printing, in which a ring type application unit having a ring (13) comprising a resin solution housing unit to apply resin solution to a cylinder (11) with said ring slid is provided with at least one means selected from the following: a) control means capable of controlling the sliding speed of the ring continuously and variably; b) sealing means having a hood for covering that part of the cylinder on which resin solution is applied and controlling steam pressure around that part to an almost fixed level; c) temperature control means for controlling a temperature of resin solution in the resin solution housing unit to an almost fixed level; and d) application start- and end-position adjusting means provided with a dummy located on the upper end side of the cylinder for starting application of resin solution and another dummy on the lower end side thereof for ending the application; and a method of smoothing the cylinder for gravure printing made with said device while bringing said cylinder into contact with a calendering roll or calendering film.

Description

Specification

TECHNICAL FIELD The present invention relates to a manufacturing apparatus and a smoothing method for a Daravia printing cylinder.

The present invention relates to an apparatus for manufacturing a gravure cylinder having a uniform resin layer thickness in a gravure printing cylinder having a resin layer on the surface, and a method for smoothing a gravure cylinder capable of easily smoothing the surface of a resin layer. I do.

Background art

Means for forming the resin layer on the cylinder include spraying, immersing the cylinder in the immersion liquid and then lifting the cylinder, or immersion after discharging the immersion liquid, and rotating the cylinder to rotate the blade or roll and cylinder. A blade doctor method for forming a resin layer based on the difference in gap between the sheet and a lamination method of applying a resin to a sheet and winding the sheet around a cylinder is known. These methods tended to cause problems such as the necessity of a large amount of resin solution when forming the resin layer, the generation of liquid dripping, the occurrence of coating film unevenness, and the generation of seams in the resin layer.

Further, in a conventional ring coating apparatus for applying a resin solution to a cylinder, a ring having a resin solution storage portion having a diameter larger than the outer shape of the cylinder is attached to the outside of the cylinder, and the cylinder is vertically arranged. This is a device that can form a seamless resin layer by sliding the ring from top to bottom at a constant speed.

However, in general, in a ring coating apparatus, a film thickness gradient occurs in the direction in which the resin layer of the cylinder is formed, that is, the film thickness increases toward the end of the formation of the resin layer. When a resin layer is formed using a resin solution containing a volatile solvent, which causes unevenness in film thickness, the evaporation speed of the solvent causes unevenness in film thickness throughout the cylinder. There were problems such as unevenness in film thickness caused by a change in fluidity due to a temperature change.

In addition, the surface of the resin layer applied to the cylinder surface when dried is not smooth. The surface of the gravure cylinder obtained by plate-making the cylinder in this state is not smooth, and if gravure printing is performed as it is, the doctor cuts the ink poorly, A so-called plate fogging phenomenon occurs in which ink is applied to portions that should not be adhered and the printed material is stained. For this reason, smoothing the resin layer applied to the surface of the gravure cylinder was an essential element.

ペーパー Paper polishing, puff polishing, and bite grinding methods are known as methods for smoothing a coated and dried resin layer. However, in these methods, the resin layer is scorched, deformed or discolored due to friction, and the polished surface is clogged, so that good polishing cannot be performed. There were also problems such as poor workability, generation of dust in the environment, and long time required for work.

An object of the present invention is to use a ring coating apparatus as a method for forming a resin layer on a cylinder, and to solve the conventional problems of film thickness gradient in the resin layer formation direction and resin solution using a volatile solvent. It is an object of the present invention to provide an apparatus for manufacturing a gravure printing cylinder in which the thickness of a resin layer is substantially uniform and the thickness of the resin layer is eliminated, which eliminates the unevenness of the film thickness due to the fluidity change due to the temperature change of the resin solution.

Another object of the present invention is to provide a method for manufacturing a gravure printing cylinder that can easily smooth the surface of a resin layer on a cylinder without using a method such as paper polishing, puff polishing, or bite grinding. On offer.

Disclosure of Invention ·

The present invention provides a cylinder, a ring having an inner diameter larger than the outer diameter of the cylinder and having a resin solution accommodating portion, wherein the ring slides on the cylinder to apply a resin solution to the surface of the cylinder, and the ring slides the ring. A ring coating apparatus for applying a resin solution to a cylinder, wherein the apparatus comprises at least one means selected from the group consisting of a, b, c and d means. Providing manufacturing equipment,

a. continuously variable means for controlling the sliding speed of the ring to be continuously variable;

b. sealing means for covering the periphery of a portion of the cylinder coated with the resin solution with a hood so that the vapor pressure of the periphery is substantially constant;

c. Temperature adjusting means for controlling the temperature of the resin solution in the resin solution storage section to be almost constant. d. A dummy for starting the application of the resin solution on the upper end side of the cylinder is placed in the cylinder. Means for adjusting the application start / end position, comprising a dummy provided at the lower end side for terminating the application of the resin solution.

The present invention further comprises contacting a cylinder provided on the surface with a resin layer having a substantially uniform film thickness obtained by the above-mentioned apparatus for producing a gravure printing cylinder with a roll or a calendering film, thereby forming a surface of the resin layer. Provided is a method for smoothing a gravure printing cylinder to be smoothed.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a sectional view showing a resin layer forming apparatus used in the present invention. FIG. 2 is an explanatory diagram showing a resin layer forming process. FIG. 3 is a graph showing an example of a tree formation rate. FIG. 4 is an explanatory view showing a resin layer forming apparatus for making the vapor pressure on the surface of the resin layer substantially constant when forming the resin layer on the cylinder. FIG. 5 is an explanatory view showing another embodiment of the apparatus shown in FIG. FIG. 6 is an explanatory diagram of a resin layer forming apparatus capable of controlling the temperature of a resin solution. 7 to 10 are explanatory views showing another embodiment of the resin layer forming apparatus of the present invention. FIG. 11 is an explanatory view showing a method of smoothing the surface of a resin layer of a Dalavia cylinder using a calender roll. FIG. 12 is an explanatory view showing a method of smoothing the surface of the resin layer of the gravure cylinder 1 with a pressure roll via a calendering film. FIG. 13 is an explanatory view showing a method of smoothing the resin layer surface of the gravure cylinder with a heating elastic rubber roll via a calendering film. FIG. 14 is an explanatory diagram showing a method of smoothing the resin layer surface of the gravure cylinder using a calendar film and an infrared lamp.

BEST MODE FOR CARRYING OUT THE INVENTION

There is a ring coating device as a device for forming a resin layer on the outer surface of a cylinder. A ring having a resin solution storage part with an inner diameter larger than the outer diameter of the cylinder is attached to the outside of the cylinder, and the resin solution is put into the storage part with the cylinder being vertical, and then the ring is fixed. The resin solution is applied by descending at a speed to form a resin layer. The thickness of the formed resin layer is controlled by the application speed, the viscosity of the resin solution, the temperature of the resin solution, and the like. The present inventors have found that even when these are applied under certain conditions, a film thickness gradient occurs in which the film thickness is small at the beginning of coating and large at the end of coating. It was found that it was difficult to form a uniform resin layer.

Thus, the present invention has found that a resin layer having a uniform thickness can be obtained by continuously varying the speed of the descending ring, thereby completing a gravure cylinder manufacturing apparatus of the present invention.

FIG. 1 is a side view of a manufacturing apparatus according to the present invention, and FIG. 2 is a partial cross-sectional view of an application state by the manufacturing apparatus. In the figure, (11) is a cylinder of the material to be coated, which is vertically fixed via a dummy (12). (13) is a ring having a resin solution storage section for forming the resin layer (1) of the cylinder (11), and (14) is a resin solution stored in the resin solution storage section. 15) is fixed at one end to the ring (13) so that the resin solution (14) does not leak from the gap between the cylinder and the ring (13) having the resin solution storage section, and the other end is attached to the outer surface of the cylinder. An elastic ring-shaped gasket that is in contact with a material made of polypropylene, polyethylene, fluorocarbon resin, etc. A ring-shaped gasket made of a material that does not dissolve or swell in the coating liquid (14) is used. A rotary motor (16) is linked to a ball screw (18) via a variable speed machine, for example, a speed reducer (17), and a ring having a resin solution storage section. (13) is with ball screw (18) The moving speed of the ring, that is, the coating speed is controlled in accordance with the number of rotations.The coating speed is controlled by a speed command from a program input in advance to the personal computer (19). This is transmitted to the servo driver (20) that controls the servo motor (16) and controls the number of rotations of the servo motor.Figure 3 is a graph showing an example of controlling the resin solution application speed. In the figure, a on the horizontal axis indicates the start position of application to the cylinder, b indicates the end position of application on the cylinder, and on the horizontal axis, the left part of a and the right part of b indicate the part applied to the dummy. In the figure, A shows the case where the coating speed is constant, B shows an example of the control of the coating speed in the present invention, and the program is based on the coating speed and the coating position. Speed The speed at the coating end position is set, and the speed gradient is connected between them by a straight line number or a curved line number, and each point for obtaining a uniform film thickness is continuously and variably specified as a speed command. Fig. 3 shows the case where there is a speed gradient connected by the number of straight battles. In a conventional ring coating device, the coating liquid is applied to a cylinder such as a cylinder, and when the coating liquid is dried, the volatile solvent contained in the coating liquid evaporates into the air layer that is in contact with the coating surface. It progresses by doing. The present inventors have found that if the evaporation of the solvent is rapid in the evaporation process of the solvent, the resin layer dries before the leveling of the coating film immediately after the coating is applied, resulting in unevenness and ultimately It was found that the film thickness tends to be uneven, and that even if the solvent vapor port around the applied resin layer becomes uneven, the film thickness tends to be uneven.

Therefore, according to the present invention, the resin solution accommodating section is slid downward from above the cylinder 1 while applying the liquid, while covering the hood which does not come into contact with the application surface covered by the cylinder. The present invention also provides a gravure cylinder manufacturing apparatus that forms a uniform resin layer without unevenness in film thickness by leveling the applied surface by setting the gap between the applied surface and the hood to a uniform saturated vapor pressure.

FIGS. 4 and 5 show a gravure cylinder manufacturing apparatus having an extendable hood device, which covers the cylinder at a portion applied in conjunction with the ring when the cylinder is applied. In the figure, the cylinder (11) is fixed vertically. (21) is a multi-stage hood which covers the coating surface of the coating liquid of the cylinder, and one end of the hood is connected to a ring, and the hood is formed when the ring (13) slides from the upper end to the lower end. Works with the ring (13). As the material of the hood, metal, glass, plastics, and composite materials of these that can be processed into a cylindrical shape are used. The structure of the hood is a multi-stage type combining several ring-shaped cylinders, and the hood after coating is stored manually or automatically, and can be incorporated into the hood supply section (22) at the upper end. It is preferable to do so. The hood is attached to the upper bearing member 33.

FIG. 5 shows another embodiment of the hood device. The structure of the hood 3) is a folding bellows type. One end of the bellows is connected to the ring, and it is extendable and contractable so that it can be linked with the ring when the ring slides from the upper end to the lower end.

In addition, the conventional ring type coating apparatus stores the resin solution in the resin solution storage section and applies the resin solution. However, the present inventors have found that the fluidity changes due to the evaporation of the solvent, and the resin having a uniform film thickness is formed. It has been found that there is a problem that it is difficult to obtain a layer. Therefore, the present invention discloses an apparatus for manufacturing a gravure printing cylinder in which the ring is provided with a heating or cooling means for controlling the temperature of the coating resin solution. Further, the present invention discloses a gravure printing cylinder manufacturing apparatus provided with a lid for covering the opening of the coating liquid storage section. The means for heating or cooling is a means using a heat medium as a fluid or an electric heating means. The temperature of the resin solution accommodating section is controlled to maintain the temperature of the resin solution at a predetermined temperature. The temperature may be controlled so as to have a predetermined temperature gradient during one application, that is, while the ring is moving downward.

FIG. 6 shows a partial cross-sectional view of the inside of the coating liquid storage section where the temperature of the resin solution can be controlled. The cylinder (11) is fixed vertically. The ring (13) having the resin solution accommodating portion is provided with a substantially hermetic type (8) to make the structure in which the solvent contained in the resin solution does not evaporate during application. The material of the lid is glass, polypropylene, acrylic resin, or the like, and is selected from materials that allow the resin solution to be viewed from the outside and do not swell when contacted with the resin solution. The ring (13) is provided with a medium inlet (26) through which the heat medium used for temperature control enters the inside of the coating liquid storage section in order to control the temperature of the resin solution storage section itself. A ring-shaped heat medium passage (25) is provided inside the ring so that the heat medium flows through the ring (13). (27) is a medium outlet from which the medium flows out of the resin solution storage section. The structure of the medium groove is such that the temperature of the entire coating solution container can be controlled uniformly.

Furthermore, the present inventors have found that when a conventional ring coating apparatus applies a resin solution to a cylinder, the resin layer thickness becomes uneven at the beginning and at the end of the application.

Therefore, in the present invention, a dummy having the same diameter as the cylinder is connected to the upper and lower sides of the cylinder, coating is started from the dummy, the coating is completed with the dummy, and a coating film having an uneven thickness is formed on the dummy. Provided is an apparatus for manufacturing a cylinder for Dalavia printing in which a resin layer thickness on a cylinder is made uniform. Further, after the coating is completed, the resin layer is uniformly dried by rotating a dummy connected with the cylinder to uniformly dry the resin layer. At this time, the dummy is in contact with the resin solution storage section and the resin solution. The rotation of this Abrasion of the contacting parts and adverse effects on reuse due to excessive agitation of the resin solution will occur. For this reason, the lower end dummy is divided into a rotating dummy and a non-rotating fixed dummy, and at the end of the application, the resin solution container and the resin solution are brought into contact at the position of the fixed dummy.

Each of FIGS. 7 to 10 is an example showing the outline of the gravure printing cylinder manufacturing apparatus. In the figure, (29) is an upper end dummy connected to the upper end of the cylinder. (30) is a rotating dummy connected to the lower end of the cylinder, and (31) is a fixed dummy connected to the lower end. (32) is an axis that connects the upper dummy (29), the cylinder one (11), the rotating dummy (30), and the fixed dummy (31) and holds them vertically. The outer shape of the upper end dummy (29), the rotating dummy (30), and the fixed dummy (31) have the same diameter as the cylinder and (11).

FIG. 7 shows a state in which the ring (13) having the resin solution storage section is set at the position of the upper dummy 9), and the amount of coating liquid necessary for coating is stored inside the coating liquid storage section. I have. FIG. 8 shows a state in which the ring (13) having the resin solution storage portion has slid to the position of the cylinder (11) and has applied the surface of the cylinder (11).

FIG. 9 shows a state in which the ring (13) having the resin solution storage section is lowered to the position of the fixed dummy (31), the entire surface of the cylinder (11) is applied, and the application process is completed. . FIG. 10 shows that the ring (13) having the resin solution accommodating portion is stopped at the position of the fixed dummy (31), and the upper end dummy is turned 9), the cylinder (11) and the shaft (32) by rotating the shaft (32). The rotating dummy (30) rotates in conjunction therewith to dry the resin layer uniformly. At this time, since the resin solution storage unit is at the position of the fixed dummy that does not rotate, it is not affected by rotation.

A method for smoothing the surface of a gravure printing cylinder having a resin layer on the surface, which is one of the present invention, will be described below.

FIG. 11 is a partial cross-sectional view showing one example of a method for smoothing the surface of a gravure cylinder. In the figure, (1) is a resin layer subjected to a surface smoothing treatment, (2) is a gravure cylinder, and (3) is a calender roll used for the surface smoothing treatment. A calendar roll is a metal roll with a metal plating such as a chrome plating layer on the surface of the roll base material. In this case, a material that is not distorted by heat and load is adopted. It is desirable that the structure of the calender roll can be adjusted in temperature by heating means such as electric heating or a heating medium. The calendar roll may be a metal roll having a plastic layer such as polypropylene, fluororesin, or silicone rubber on the surface, in addition to the metal roll.

The surface smoothing method is as follows: a gravure cylinder) is brought into contact with a calender held at a predetermined temperature, and the calender roll and gravure cylinder are rotated at the same speed to smooth out the resin layer surface evenly. . Separation between the resin layer and the calender roll surface is performed gradually under the condition that there is no step in the resin layer, and the load pressure and heat are selected from the condition that the resin layer and its part do not transfer to the calendar roll. Is performed.

FIG. 12 is a partial cross-sectional view showing another embodiment of the present invention for smoothing the surface of the resin layer via a calender film between the gravure cylinder 1 and the pressure roll. In the figure, (4) is a film for calendar use for performing a surface smoothing treatment. The material of the calender film is a plastic film such as polyester or fluororesin, and is a film having an arbitrary surface smoothness that does not cause distortion due to the pressure of the pressure roll (5) and heat. (6) is a guide roll for applying an appropriate tension to the film.

The method of smoothing the surface of the resin layer using the calender film is as follows. The film (4) unwound from the unwinding section (8) is passed between the gravure printing cylinder) and the pressure roll (5). Then, wind up at the winding section (7). The pressurizing roll (5), which has reached the specified temperature, is gradually pressed to the gravure cylinder (2) until the specified pressure is applied, and the gravure printing is performed in the film winding direction at the same time as film winding. Rotate the cylinder to smooth the surface of the resin layer. The separation between the resin layer (1) and the pressure roll (5) is gradually performed under the condition that there is no step on the surface of the resin layer, and the load pressure and temperature of the pressure roll (5) are It is selected from (1) and the condition that a part thereof does not transfer to the film (4). As a method for smoothing the surface using a calender film and a heated elastic rubber roll, the resin layer of the gravure printing cylinder is in a dried state or the surface is tacky. In the case of Lee, another embodiment of the present invention in which a heated elastic rubber roll is pressed through a calender film to smooth the surface of the resin layer is described below.

FIG. 13 is a partial cross-sectional view showing one example of a method for smoothing the surface resin layer of the gravure printing cylinder 1 using a calender film and a heated elastic rubber roll. In the figure, (h) is a resin layer uniformly applied, (2) is a gravure cylinder, and (4) is a calender film for surface smoothing. The material of the calender film is selected from a plastic film such as polyester or fluorocarbon resin, and a film having any smoothness that does not cause distortion due to the pressure and heat of the heated elastic rubber roll (9). The heating elastic rubber roll (9) is obtained by applying a thick film rubber on a metal roll, and the material of the rubber is selected from silicon rubber, fluororesin rubber, and the like that can withstand heating. As a method of ripening, any means such as electric heating or a ripening medium is adopted.

The surface smoothing method using a calendering film and a heated elastic rubber roll is as follows. A calender film (4) is passed between a gravure printing cylinder (2) and a heated elastic rubber roll (9) to reach a predetermined temperature. The heated elastic rubber roll (9) is gradually pressurized to a gravure printing cylinder) until a predetermined weight is applied, and while rotating the gravure printing cylinder in the same direction as the film winding direction, the calender film is pressed. The smoothness is transferred to the surface of the resin layer and smoothed uniformly. The separation between the resin layer (1) and the heating elastic rubber roll (9) is gradually performed under the condition that no step is formed on the surface of the resin layer, and the weight and the temperature of the heating elastic rubber roll (9) are controlled by the resin layer (1). ) And some of them do not transfer to film (4).

Next, another embodiment of the present invention for smoothing the surface of the resin layer using a calendering film and infrared rays when the resin layer of the gravure printing cylinder has been dried or the surface is in a tack-free dry state will be described.

FIG. 14 is a partial cross-sectional view showing one example of a method for smoothing the surface resin layer of a gravure printing cylinder using a calender film and an infrared lamp. In the figure, reference numeral (10) denotes an infrared lamp, which irradiates the resin layer with infrared rays to heat and soften the surface. This lamp does not cause a curing reaction of the resin layer, and if there is a heating action, other lamps Can be

The method for smoothing the surface using the calender film and the infrared lamp is as follows. The force render film (4) supported by two guide rolls is wound on a part of the gravure printing cylinder) in the circumferential direction. Irradiate an infrared lamp (10) from above the calendar film (4). The rotation speed of the gravure cylinder is set so that the resin layer (1) receives the amount of heat rays that is heated and softened by the infrared lamp (10), and the calendar is rotated while rotating the gravure cylinder in the same direction as the film winding direction. The one-use film is brought into contact with the surface of the resin layer to evenly smooth the surface of the resin layer.

In the present invention, the resin applied to the cylinder surface is not particularly limited as long as it is softened to some extent by heating, but is preferably selected in consideration of gravure printing suitability.

Example 1

The polyamide-based photosensitive resin coating solution was uniformly applied to a thickness of about 100 m (dry thickness) on one surface of the cylinder using a ring-type coating apparatus shown in FIG.

The resin layer applied to the cylinder (0174 × 580 mm) was dried in an oven at 5 CTC for about 1 hour. After returning to room temperature, the surface of the resin layer was brought into contact with a smooth mirror roll (2OOX7O Omm) with a chrome-plated iron base surface (see Fig. 11). The smoothing conditions were as follows: the surface temperature of the calendar roll was 80, the center line surface roughness was 0.02 m, the applied pressure was 5 kg / cm ² , and the rotation speed was 1 rpm. The resin layer and the calender roll surface were gradually separated under the condition that no step in the film thickness was generated.

Example 2

The surface of a 50 m-thick polyester film was brought into contact with a gravure cylinder prepared under the same conditions as in Example 1 (see FIG. 12). Pressure was applied from above the polyester film using a pressure roll (200 x 700 mm). The pressure roll has a surface temperature of 80 ° C, the applied pressure is 5 kg / cm ² _{s, the} film feed speed lcm / se, the center line surface roughness is 0.02 xm, and the rotation speed of the pressure roll and gravure cylinder is the film feed speed. Speed was matched. The results of measuring the surface roughness of the gravure cylinder obtained in Example 1 and Example 2 are shown in Table 1 below.

Table 1 Unit: 〃m r 1 1 1 1

I I Before smoothing I Example 1 I Example 2 I

I Ra I 0.253 | 0.062 | 0.048 |

I Rmax | 5.793 I 0.980 | 0.874 I

I Rz I 3.457 I 0.625 | 0.577 I

I I I I 1 Note

1) The surface roughness meter used was Surfcoder SE-40C (manufactured by Kosaka Laboratories).

2) F indicates the center line surface roughness, Rmax indicates the maximum height, and Rz indicates the ten-point average roughness.

The surface of a 50 m-thick polyester film was brought into contact with a gravure cylinder obtained in the same manner as in Example 1. Top surface temperature of polyester film 80. A heated elastic rubber roll (200 × 700 mm) was brought into contact with C at a load pressure of 5 Ks / cm ² . The rotation speed of the elastic rubber roll and the gravure cylinder was 1 cm / sec and the center line surface roughness was 0.02 m. The rotation speed of the film and the gravure cylinder were the same as those of the film (see Fig. 13).

The results of measuring the surface roughness of Example 3 are shown in Table 2 below. Unit: μ.m

Ding τ

1 Before smoothing 1 Example 3

Bird

Ra 1 0.266

I

Rmax 1 5.755 1 0.858

I

Rz 1 3.517 1 0.570

丄 J

Example 4

A gravure cylinder obtained by operating in the same manner as in Example 1 was provided with a small infrared lamp device equipped with a parallel reflector so that infrared light was irradiated on a part of the surface of the resin layer (first example). See Figure 4). The surface of a 50 m thick polyester film was brought into contact with the gravure cylinder. The feed speed of the film was 5 rnrn / sec, and the center line surface roughness was _0.02 m. The rotation speed of the gravure cylinder was matched with the film feed speed. The tension of the film was 1 O Kg / m.

The results of measuring the surface roughness of Example 4 are shown in Table 3 below.

Table 3 Haseyo: JJL m

-Cho- -cho-

I Before smoothing I Example 3 I

toe-

Ra I 0. Z71 I 0.069 I

Toichi

I 5.813! 0.997 |

I "-

Rz I 3.547 I 0.651 |

I -J 1 I Comparative Example 1

Table 4 shows the results of applying a polyamide photosensitive resin to a cylinder (174 x 580 mm) at a constant coating speed using the ring coating device shown in Fig. 1. The viscosity of the coating solution was 290 CPS, and the coating speed was 0.9 ltnm / se at a constant speed of 40. CTC.

Table 4

I 1] 1 1! 1 1

I position I 30 I 134 I 238 | 342 | 446 | 550 |

I 1 1 1— · — I 1 1 1

I Thickness (m) I 85.0 I 91.9 I 96.6 | 100.6 | 105.1 | 110.6 |

I I I I I I I I Note:

1) The position is the distance from the coating start point to the film thickness measurement point.

2) The film thickness is the average value of 10 points on the same circumference at the measurement position.

3) The total average thickness is 98.3 m.

4) Film thickness is measured with a digital gauge film thickness measuring device (manufactured by Sony Magnescale) after peeling the resin layer.

As described above, at a constant coating speed, the thickness of the resin layer applied to the cylinder gradually increases as the resin solution storage unit descends from the application start point. There is unevenness.

Example 5

The results of the thickness of the applied resin layer are shown in the following table while controlling the application speed in the ring coating apparatus shown in FIG. The coating liquid is the same as in Comparative Example 1. The coating speed at the coating start position was set at 0.91 mm / sec. The coating speed at the coating end position (at a position of 580 rnm from the start point) was set at 0.71 mm / sec. Furthermore, the two points were connected with a straight line, and the application speed at each point was continuously output from the program to control the speed of the resin solution storage unit. The coating speed, negative acceleration 0 2 8;. Was dark speed by m / _SEC ^2. This change in coating speed is shown in FIG. Symbol B in the figure is an example 5. The symbol A indicates Comparative Example 1. Table 5 shows the results.

Table 5

I 1 1 1 1 i 1 1

I position (optional) I 30 I 134 I 238 | 342 | 446 | 550 |

I Thickness (t m) I 84.8 I 87.6 | 86.2 | 83.8 | 84.3 | 86.1 |

I I! I I! I I Note:

3) The total average film thickness is 85.5 um.

As described above, according to the ring coating apparatus of the present invention, a resin layer having a uniform film thickness without a film thickness gradient could be applied to the cylinder surface.

Example 6

A resin layer was applied to a gravure cylinder by operating in the same manner as in Comparative Example 1, except that a hood device was attached to the ring-type coating device of the present invention. Table 6 shows the coating results. The hood device was a multi-stage hood as shown in Fig. 8.

Table 6

I 1 1 1 i 1 1 1

I position (sub) i 30 I 134 I 238 | 342 | 446 | 550 |

I Thickness (m) I 84.5 | 88.3! 92.0 1 95.9 | 100.1 | 104.2 |

I I I! 1 1 1 I Note:

2) The film thickness is the average value of 10 points on the same circumference at the measurement position. 3> The total average film thickness is 98.2 m.

4) The film thickness was measured using a digital gauge film thickness measuring device (manufactured by Sony Magnescal) after the resin layer was peeled off.

As described above, according to the ring coating apparatus of the present invention, it was possible to apply a resin layer having no thickness unevenness on the surface of a cylinder such as a cylinder.

Example 7, Comparative Example 2

As an example, a coating experiment was performed by a conventional method in which the temperature of the coating solution was controlled, the glass solution was further covered in the resin solution storage section, and neither was performed. The results are shown in Table 7. Other application conditions are cylinder size 174 X 580mm, coating liquid is polyamide photosensitive resin, viscosity 290 OCPS, coating liquid temperature 40.0 ° C, coating speed 0.91 mm / sec.

Table 7 Unit: p.m

I 1 1 1

I I Temperature control I Temperature control and I I position (mm) I 1 1 I

I I without I with I I with glass lid I

I 30 I 85.0 I 85.2 I 85.3 |

I 134 I 91.1 I 9Z.0 I 91.4 |

I 238 I 96.9 I 97.3 I 97.5 |

I 342 I 100.6 I 100.3 I 100. Z I

I446 I 105.1 I 102.5 I 101.5 |

I 550 I 110.6 I 106.6 I 103.8 |

I I I I I Note:

3) The film thickness is measured using a digital gauge film thickness measuring device (manufactured by Sony Magnescale) after peeling the resin layer.

Thus, when comparing the results of the ring type coating apparatus of the present invention with those of the conventional method, a resin layer having a more uniform film thickness was obtained by the apparatus of the present invention.

Example 8

In the ring coating device, the upper and lower ends of the cylinder are fixed with a dummy of the same diameter, and the thickness of the resin layer changes due to the start of coating from the dummy and the end of coating by the dummy. The effect on the composition was investigated. The method of installing the dust and the method of drying the resin layer are as shown in FIGS. 7 and 10.

Table 8 shows the changes in the film thickness at the top and bottom of the cylinder when the dummy was used and when it was not used. The application conditions were: cylinder size 174 x 58 Omm, coating liquid: polyamide photosensitive resin, viscosity: 2900 CPS, coating liquid temperature: 40. TC, coating speed: 0.91 hidden / sec, top edge: 1 74 x 20 Omm, Assuming that the rotary damper is ø 174 X 3 Omm and the fixed dummy is 174 X 17 Omm, the coating start position is the center of the upper dummy and the coating end position is the center of the fixed dummy.

Table 8 Unit: m

Factory-

I Measurement position

I I without I with I

I Sinterer "-Top I 85.0 I 98.6 |

I Sinterer'-Bottom I 104.8 I 102.5 |

Shi--Upper-Upper Note

1) The upper end of the cylinder at the measurement position is Omm from the upper end, and the lower end of the cylinder is 3 Omm from the lower end.

3) Film thickness is measured using a digital gauge film thickness measuring device (manufactured by Sony Magnescale) after peeling the resin layer.

As described above, the ring coating apparatus of the present invention eliminated the unevenness of the film thickness at the beginning and at the end of coating of the cylinder.

Industrial applicability

The gravure printing cylinder manufacturing apparatus of the present invention can easily form a resin layer having a uniform thickness. Since it can be formed on the cylinder surface, it is useful as a gravure printing cylinder manufacturing device. In addition, the method for smoothing the resin layer surface of the gravure cylinder of the present invention can very easily smooth the resin layer surface and easily provide a gravure printing cylinder capable of obtaining a beautiful printed matter. .

Claims

The scope of the claims

1. A cylinder, a ring having an inner diameter larger than the outer diameter of the cylinder and having a resin solution accommodating portion, and a resin solution being slid on the cylinder to apply the resin solution to the cylinder surface; A ring coating apparatus for coating a cylinder with gravure printing, wherein the apparatus comprises at least one means selected from the group consisting of a, b, c and d means. Continuously variable means for controlling the sliding speed of the vehicle to be continuously variable,

b. sealing means for covering the periphery of the cylinder portion coated with the resin solution with a hood so as to make the vapor pressure of the periphery substantially constant;

c. Temperature adjustment means for controlling the temperature of the resin solution in the resin solution storage section to be almost constant. d. Dummy for starting the application of the resin solution on the upper end of the cylinder, and finishing application of the resin solution on the lower end of the cylinder. Means for adjusting the coating start / end position provided with a dummy to be applied.

2. The apparatus for manufacturing a cylinder for Dalavia printing according to claim 1, wherein the ring includes a ring-shaped gasket for preventing leakage of the resin solution from a gap between the resin solution storage portion and the cylinder.

3. The Daravia printing cylinder manufacturing apparatus according to claim 1, wherein the continuously variable means is means for controlling a sliding speed of the ring by controlling a rotation speed of a ball screw in which one end of the ring is meshed.

4. The gravure printing cylinder manufacturing apparatus according to claim 1, wherein the sealing means is a telescopic hood having one end fixed to an upper bearing portion and the other end fixed to a ring.

5. The Daravia printing cylinder manufacturing apparatus according to claim 1, wherein the temperature adjusting means is means for circulating a heat medium in the resin solution containing section, or means for heating or cooling the resin solution containing section from outside.

6. The gravure printing cylinder manufacturing apparatus according to claim 5, wherein the temperature adjusting means is provided with a cover for covering an upper portion of the resin solution containing section.

7. A means for adjusting the coating start and end positions is provided at the upper end of the cylinder with a dummy having the same diameter as the cylinder and rotatable with the cylinder. 2. The gravure printing cylinder manufacturing apparatus according to claim 1, wherein a dummy having the same diameter as the cylinder and rotating with the cylinder and a fixed dummy not rotating are connected in series.

-8. A method of smoothing a cylinder for gravure printing, in which a cylinder provided with a resin layer having a substantially uniform film thickness on its surface is brought into contact with a roll or a force-rendering film to smooth the resin layer surface.

9. The method for smoothing a cylinder for Dalavia printing according to claim 8, wherein the cylinder provided with a resin layer on the surface is obtained by the gravure printing cylinder manufacturing apparatus according to claim 1. .

10. The method for smoothing a gravure printing cylinder according to claim 8, wherein the roll is a calender roll.

11. The method for smoothing a gravure printing cylinder according to claim 8, wherein the calender film is pressed against the cylinder by a pressure roll.

12. The method for smoothing a gravure printing cylinder according to claim 8, wherein the calender film is pressed against the cylinder by a heated elastic rubber roll.