JP2000017586A - Dyeing method for substrate having curved surface and transfer printing machine therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce dyed plastic lenses that can improve the operation environment, permits easy control of the color concentration and gives stabilized color phase without unevenness. SOLUTION: An oil-based ink in which subliming pigments are solved or dispersed are placed on the convex face of a plastic lens 1 and the plastic lens is arranged beneath the screen frame 13 on which the screen gauze 23 is extended with a loose tension as much as possible, as the convex face of the lens is kept on the upper side. A screen gauge 23 is intervened between the squeegee 15 that has the concave of an almost same curvature as that of the convex face of the plastic lens and the plastic lens 1. Then, as the holder base is rotated in the rectangular direction to the widthwise direction of the squeegee 15, the screen frame 13 is moved in the rectangular direction to the widthwise direction of the squeegee to transfer the coloring layer 43 to the convex face of the plastic lens 1 and to sublime the pigments in the coloring layer into the plastic lens 1 followed by the removal of this coloring layer 43.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for staining a chromosome having a spherical convex surface, such as a plastic lens, and a transfer apparatus suitable for carrying out the method.

[0002]

2. Description of the Related Art A dip dyeing method (hereinafter referred to as "dip dyeing method") is often used as a method for dyeing plastic lenses for spectacles. This dip dyeing method mixes the three primary colors of red, blue and yellow of a disperse dye and prepares a dyeing solution dispersed in water. The dyeing solution is heated to about 90 ° C., and a plastic lens is immersed therein. Dyeing is performed.

Further, as an alternative to the dip dyeing method, for example, a dyeing method by a gas phase method as disclosed in Japanese Patent Publication No. 1-34877 has been proposed. The proposal of this vapor phase method is to heat a solid sublimable dye to sublimate it and dye a plastic lens which is also in a heated state.

[0004]

However, in the dyeing method,
There is a problem that the affinity of the dye for the plastic lens in water is low, and it takes an extremely long time to dye it at a high concentration. It is possible to shorten the dyeing time by using a dye solution containing a high concentration of disperse dye as the dye solution, but the dispersion and unevenness of the hue occur due to the interaction and aggregation of the disperse dye, and the dye solution is stable. There is a problem that a proper dyeing cannot be obtained. Further, since the dyeing solution in which the dye remains at a high concentration must be finally discarded, the dye cannot be effectively used, and a problem of waste liquid treatment occurs. Furthermore, in the dip dyeing method, since the dyeing solution is heated as described above, the dyeing operation is performed in an environment where the odor due to the dye exists at high temperature and high humidity, and there is a problem that the working environment is poor.

[0005] In the above-mentioned dyeing method by the gas phase method,
Since the solid sublimable dye is heated to dye the lens, there is no problem such as waste liquid treatment after dyeing, but it is difficult to quantitatively fly the dye on the lens surface, and it is difficult to adjust the dye concentration. There are also problems, such as difficulty in dyeing dark colored lenses.

Accordingly, the present invention is intended to provide a work environment in which the color density can be easily adjusted for a chromosome having a spherical convex surface such as a plastic lens in a comfortable working environment, and a stable hue without unevenness can be obtained. Is a first object. A second object is to provide a novel transfer device suitable for carrying out the first object.

[0007]

In order to achieve the first object, the method of the present invention for dyeing a chromosome having a curved surface according to the present invention comprises a method of dissolving a sublimable dye or dispersing fine particles into a dyeing material on an upper surface. While being placed, the chromosome is placed with the convex surface up, under the screen frame on which the screen gauze is stretched with a loose tension enough to be able to adhere along the spherical convex surface of the chromosome. Using a squeegee having an edge processed so as to be depressed with a curved shape substantially the same as the curved shape of the convex surface of the chromosome, the screen gauze is sandwiched between the squeegee and the convex surface of the chromosome. Moving the screen frame and the squeegee relatively in a direction perpendicular to the width direction of the squeegee while rotating the chromosome in a direction perpendicular to the width direction of the squeegee. The coloring layer of the dyeing material is transferred to the convex surface of the chromosome by screen printing, and then the sublimable dye in the transferred coloring layer is sublimated and penetrated into the chromosome. It is characterized by being removed. Here, the spherical convex surface is not limited to a perfect spherical shape, but includes a convex surface having a different curvature depending on the direction, such as a barrel portion, and a shape such as an aspherical lens for spectacles. In other words, a spherical convex surface
It can be said that it is constituted by a curved surface that smoothly curves 360 degrees from the top in each direction. In addition, if it is a convex surface that may be called a substantially spherical surface,
The convex surface can be dyed without any problem by applying the method of the invention. Here, the chromosome can be a plastic lens. Examples of the dyeing material include oil-based inks in which a sublimable dye is dissolved or dispersed in fine particles. However, the method of the present invention can of course be used for dyeing chromosomes having a spherical convex surface other than plastic lenses, and the dyeing material is not limited to oil-based inks, but is a water-based ink containing a sublimable dye. Can also be used.

According to this dyeing method, a squeegee whose edge is depressed into a curved shape substantially the same as the curved shape of the spherical convex surface of the chromosome is used, and the screen gauze is attached to the screen frame by the above-described method. The screen gauze can be brought into close contact with the convex surface of the chromosome to be subjected to such a gentle tension. Here, by adjusting the contact angle of the squeegee, the screen gauze can be sandwiched by a single squeegee in a state in which the screen gauze is in close contact with a convex surface having a slightly different curved shape within a certain range. Therefore, even if the curved shape of the edge of the squeegee does not completely match the curved shape of the convex surface of the chromosome, there is no practical problem. In the case where the convex surface is a spherical surface, the edge of the squeegee may be processed so as to be depressed at a curvature substantially equal to the curvature of the convex surface. In this staining method, the screen frame is rotated while rotating the chromosome in a direction perpendicular to the width direction of the squeegee while maintaining the state in which the screen gauze is in close contact with the convex surface of the chromosome by the edge of the squeegee as described above. And the squeegee are relatively moved in a direction perpendicular to the width direction of the squeegee.

Here, when rotating the chromosome, the center of rotation is set so that the screen gauze can be rotated in a state in which the screen gauze is firmly adhered to the convex surface of the chromosome by the edge of the squeegee. For example, when the convex surface is a spherical surface, the center of rotation may be set near the center of curvature. Even when the convex surface is a spherical surface, it is sufficient that the screen gauze can be maintained in close contact between the squeegee and the convex surface during rotation, and even if the center of curvature of the convex surface does not coincide with the rotation center, it is practical. There is no problem. Also, in relative movement of the screen frame and the squeegee, the squeegee may be fixed and the screen frame may be moved,
Conversely, the screen frame may be fixed and the squeegee may be moved, or both the screen frame and the squeegee may be moved.

By performing screen printing as described above, it is possible to form a colored layer of a dyeing material having a uniform film pressure on the spherical convex surface of the chromosome. After that, the sublimable dye in the colored layer transferred to the convex surface by heating the chromosome is sublimated and penetrated into the chromosome. As a method of performing sublimation infiltration by heating, any of dry heat treatment and steam heat treatment may be employed. After the sublimable dye is sublimated and penetrated into the chromosome in this manner, the colored layer remaining on the convex surface of the chromosome is removed using a solvent or the like. As a result, the spherical convex surface of the chromosome can be stained with a desired hue and density without unevenness.

According to this dyeing method, when preparing a dyeing material, a chromosome, such as a plastic lens, is colored in a desired hue by changing the mixing ratio of each of the three primary colors of red, blue and yellow. Can be done. In addition,
A black sublimable dye may be used, or a black sublimable dye may be added to the above three primary colors as needed. Also, the color depth can be easily adjusted by the processing time when performing sublimation infiltration.If you want to develop a light color, make the processing time relatively short, and if you want to develop a dark color, It may be adjusted by making the processing time relatively long. In addition, as a heating temperature when sublimation infiltration is performed by heating when the chromosome is a plastic lens, the heating temperature of the plastic lens is generally in the range of 80 ° C to 160 ° C, more preferably in the range of 80 ° C to 130 ° C. The temperature should be as high as possible according to the heat resistant temperature. At present, as plastic lenses for eyeglasses,
(1) Polycarbonate resin (for example, diethylene glycol bisallyl carbonate polymer (CR-3)
9)), (2) polyurethane-based resin, (3) allyl-based resin (for example, allyl diglycol carbonate and its copolymer, diallyl phthalate and its copolymer),
(4) fumaric acid resin (for example, benzyl fumarate copolymer), (5) styrene resin, (6) polymethyl acrylate resin, (7) cellulose resin (for example, cellulose propionate), etc. Is used. Among them, for example, a polycarbonate resin has a high heat-resistant temperature, so that even if it is heated to about 160 ° C., it does not affect optical characteristics. Further, the polyurethane resin has a lower heat resistance temperature than the polycarbonate resin,
There is no problem even if it is heated to a certain degree. When the chromosome is a plastic lens for spectacles, including a polycarbonate resin, a desirable heating temperature is 80 ° C to 1 ° C.
It is preferable to select a temperature as high as possible in the range of 30 ° C. according to the heat resistant temperature of the lens material. This is because, if the temperature is up to 130 ° C., even if the plastic lens is made of any resin, the optical characteristics and the like are not affected. Also, 8
Since sublimation is not actively performed at 0 ° C. or lower, it is desirable to select a temperature of 80 ° C. or higher when performing sublimation infiltration by heating.

Here, when the method of heating the screen-printed chromosomes during the sublimation is adopted, the heating temperature is set as high as possible because the heating time for developing a desired hue and density is shortened. This is because productivity can be improved. Also, since the sublimability is different for each dye that is dissolved or dispersed in fine particles for dyeing, in order to obtain a chromosome of a desired hue and density, first determine the heating temperature, This is because the preparation conditions of the dyeing material can be easily determined.

[0013] In this case, the heating time may be appropriately set according to the desired concentration, and may be appropriately set within a range of, for example, 5 to 120 minutes. In order to achieve a stable color development state, it is more preferable to set the time to about 20 minutes to 120 minutes. Taking into account not only the heating temperature but also the heating time, it is preferable to prepare a dyeing material so as to obtain a chromosome to be colored to a desired hue and density. The dyeing material is optionally a viscosity modifier (generally referred to as "medium" in the printing industry, if necessary) so that a uniform colored layer can be transferred to the convex surface of the chromosome by screen printing. "Medium"
That. ) May be used to adjust the viscosity. Also,
Even if the heating time is prolonged, the coloring density due to the sublimation penetration gradually converges. Therefore, the dyeing material is prepared so that the desired hue and density can be obtained at about 120 minutes at the longest. Good.

Further, the screen gauze may be provided with a print image portion corresponding to the transfer surface of the chromosome. As the screen gauze, a screen gauze having a mesh size of 180 to 300 meshes in the print image portion may be used. This is because clogging may occur if the eyes are finer than 300 mesh. Conversely, if the mesh is coarser than 180 mesh, the thickness of the colored layer may not be uniform. However,
The roughness of the printed image portion may be outside the above range depending on the relationship with the viscosity of the dyeing material to be used. In addition, 180 mesh ~
Within the range of 300 mesh, for various dyeing materials adjusted to a viscosity suitable for screen printing,
Screen printing can be performed well.

In addition, in the final step, in removing the colored layer remaining on the convex surface of the chromosome after infiltration of the sublimable dye, the dyeing material remaining without damaging the chromosome is removed. It is preferable to use a solvent which can easily remove the solvent. For example, when the chromosome is a plastic lens for spectacles and the dyeing material is an oil-based ink, a ketone-based solvent such as acetone or methyl ethyl ketone or an alcohol-based solvent such as isopropyl alcohol can be used. Further, it is preferable to immerse the plastic lens in a cleaning tank filled with such a solvent to perform ultrasonic cleaning. In addition, a solvent other than the above-mentioned solvents may be used as long as the colored layer remaining on the convex surface can be removed without disturbing the chromosome itself, such as the optical characteristics of the plastic lens.

The reason why the oil-based ink is preferably used in the method of the present invention is that, when the chromosome is a plastic lens, when the screen is directly printed on the convex surface of the plastic lens, the oil-based ink is compared with the aqueous ink. It is because familiarity is good. Of course, even when the water-based ink is used, there is no problem as long as appropriate screen printing can be performed on the convex surface of the plastic lens by adjusting the viscosity or the like. In the case of staining a chromosome other than a plastic lens, a case where a water-based ink is more appropriate is also assumed.

In this dyeing method, as a more desirable embodiment, when the viscosity of the dyeing material is adjusted with a binder such as medium, the viscosity is adjusted with a binder that does not hinder the penetration of the sublimable dye into the chromosome. Can be listed. Specifically, if the chromosome is a plastic lens, it is desirable to adjust the viscosity with a binder having a low permeability of the sublimable dye as compared with the plastic lens. this is,
This is to prevent the sublimable dye from penetrating only into the binder in the color-forming step and hardly penetrating the chromosome.

Next, a description will be given of a transfer apparatus according to the present invention which has been made to achieve the second object. The transfer device of the present invention includes a holder capable of fixing a printing medium having a spherical convex surface with the convex surface facing upward, and a holder disposed above the holder and capable of closely adhering along the convex surface of the printing medium. A screen frame having a screen gauze stretched with a loose tension of
A squeegee disposed above the screen frame and having an edge processed to be concave with a curved shape substantially the same as the curved shape of the convex surface of the printing medium; and elevating at least one of the squeegee and the holder. Thereby, the screen gauze is brought into close contact with the convex surface of the printing medium, and an adhesion unit that is sandwiched between the printing medium and the squeegee,
Rotating means for rotating the holder in a direction orthogonal to the width direction of the squeegee; and moving means for relatively moving the screen frame and the squeegee in a direction orthogonal to the width direction of the squeegee. And characterized in that:

According to this transfer device, a printing medium (for example, a plastic lens) having a spherical convex surface is fixed to the holder with the spherical convex surface facing up. Also in this case, the spherical convex surface is not limited to a perfect spherical surface, as described for the staining method. Then, by operating the contacting means, the holder is raised, or the squeegee is lowered, or by performing both operations, the screen gauze loosely stretched on the screen frame is brought into contact with the edge of the squeegee and the printing medium. Make sure it is tightly attached to the convex surface. Here, as already described in the dyeing method, the screen gauze is stretched with a gentle tension to the screen frame, and the edge of the squeegee has a curved shape substantially the same as the curved shape of the convex surface of the printing medium. Since the screen gauze is processed into the depressed shape, the screen gauze can be sandwiched between the edge of the squeegee and the convex surface of the printing medium in a state in which the screen gauze is tightly in line contact. A print image corresponding to the size of the convex surface of the printing medium is formed on the screen gauze, and printing ink is placed on the screen image.
In this case, it is desirable that the eyes of the printed image have a roughness of about 180 to 300 mesh as described above.

When the screen gauze is firmly sandwiched between the convex surface of the printing medium and the edge of the squeegee, the rotating means is operated to rotate the holder in a direction perpendicular to the width direction of the squeegee. At the same time, the moving means is operated to relatively move the screen frame and the squeegee in a direction perpendicular to the width direction of the squeegee.
Also in this case, the rotation means sets the rotation center so that the screen gauze can be rotated in a state in which the screen gauze is firmly adhered to the convex surface of the printing medium by the edge of the squeegee. For example, when the convex surface is a spherical surface, the center of rotation may be set near the center of curvature. Even if the curved shape of the edge of the squeegee does not completely match the curved shape of the convex surface of the printing medium, it is possible to maintain a good contact state by adjusting the inclination thereof. The moving means may be any of those that move only the screen frame, those that move only the squeegee, and those that move both the screen frame and the squeegee. This is because it does not matter whether the screen frame is moved or the squeegee is moved as long as the colored layer having a uniform thickness can be screen-printed while the screen gauze is in close contact with the convex surface of the printing medium. .

In this transfer apparatus, a general screen printing machine for curved surface printing is used in that the shape of the edge of the squeegee is made as described above, the screen gauze is loosened, and the holder is rotated. Are very different. And, by this characteristic configuration, it is possible for the first time to form a colored layer by screen printing on a printing material that cannot be screen-printed conventionally, such as a printing material having a spherical convex surface. It is.

Using this transfer device, a plastic lens as a printing medium is fixed to a holder with its convex surface facing up, and a dyeing material in which a sublimable dye is dissolved or dispersed in fine particles is placed on a screen gauze. By performing the screen printing, a colored layer having a uniform thickness containing a sublimable dye can be formed on the convex surface of the plastic lens. Therefore, according to this transfer device, the plastic lens on which the colored layer is formed is heated to allow the sublimable dye in the colored layer to sublimate and permeate, whereby the plastic lens can be dyed. Further, the transfer device of the present invention is not limited to such applications, and enables screen printing on a spherical convex surface which cannot be achieved by a conventional screen printing device. Therefore, this transfer device is not limited to the plastic lens, and is not limited to only the implementation of the method of dyeing a plastic lens, as a device for performing screen printing on a printing target having a spherical convex surface,
It can be used as a general-purpose curved surface printing device.

[0023]

Next, an embodiment of the present invention will be described. First, a transfer device used for dyeing a plastic lens in this embodiment will be described with reference to FIG. The transfer device 10 of this embodiment includes a lens holder 11 capable of fixing the plastic lens 1 with its convex surface facing upward, a screen frame 13 disposed above the lens holder 11, and a screen And a squeegee 15 disposed above the frame 13.

The lens holder 11 is made of a polyurethane resin having a hardness of 80 ° in terms of hardness according to JIS-A and having a convex surface having the same curvature as the concave side of the plastic lens 1 to be fixed. I do. The lens holder 11 is fixed to an upper surface 19 of a holder base 17 that can move up and down in the vertical direction. The holder base 17 is configured to be rotatable around the center of curvature of the lens holder 11 as a center of rotation.

The screen frame 13 is supported by a guide device (not shown) so as to be horizontally movable in a direction perpendicular to the width direction of the squeegee 15 at a predetermined height from the floor surface. The screen frame 13 has a screen gauze 23 on which a circular print image 21 is formed. Here, in particular, this screen gauze 23
In a printing process to be described later, the screen frame 1 is loosely tensioned so as to be able to adhere along the convex surface of the plastic lens 1.
3 is one of the features. Although it is difficult to define the tension numerically, the tension may be set to be as low as possible within a range where the screen gauze 23 can be tensioned with respect to the screen frame 13. The coarseness of the portion of the print image 21 is 180
Mesh to 300 mesh.

The squeegee 15 has an edge 25 that is recessed upward with the same curvature as the curvature of the convex surface of the plastic lens 1 to be screen-printed. In the present embodiment, the squeegee 15 is manufactured from wood, and is processed so that the cross-sectional shape of the edge 25 is a curved surface. Also,
The squeegee 15 is held by a squeegee holder (not shown) so as to be able to move up and down in a vertical direction, and can be fixed to the squeegee holder by changing its inclination angle.

FIG. 2 shows a schematic configuration of a driving mechanism of the transfer device 10. The squeegee 15 is configured to be moved up and down as indicated by an arrow A by a squeegee raising / lowering actuator 31, and is supported by a lifting guide (not shown) so as to be able to move vertically together with the squeegee holder. The screen frame 13 is horizontally moved as indicated by an arrow B by a screen frame moving actuator 33, and is supported by a horizontal guide (not shown) so as to be horizontally movable. And holder base 1
7 is supported by a lift guide (not shown) so as to be vertically moved by a holder base lifting / lowering actuator 35 as shown by an arrow C, and is also held by a holder base rotating actuator 37 as shown by an arrow D. It is configured to be rotated around the center of curvature of. As the squeegee elevating actuator 31 and the holder base elevating actuator 35, for example, an air cylinder or the like can be used. Further, as the screen frame moving actuator 33 and the holder base rotating actuator 37, for example, a motor or the like can be used.

Next, a method for transferring a dyed colored layer to the plastic lens 1 by screen printing and dyeing the plastic lens 1 using the above-described transfer device 10 will be described.
First, an oil-based ink is prepared so as to have a desired hue and density. As the oil-based ink, an ink in which a sublimable dye is dissolved or dispersed in fine particles so as to have a desired hue and concentration is blended. Further, the oil-based ink having been adjusted in hue or the like is further dissolved or dispersed in fine particles in a solvent-based medium as a viscosity adjusting binder, if necessary. At this time, various media can be used, but a medium in which the sublimable dye in the oil-based ink hardly penetrates than the plastic lens 1 in the color forming step is selected. The medium may be used in such a ratio that the viscosity of the oil-based ink becomes a viscosity at which screen printing is possible. Oil-based inks include acrylic inks, polycarbonate inks, vinyl chloride inks,
An ink for polypropylene or the like can be used. Examples of commercially available oil-based inks include “Riotran SS (trade name, hereinafter the same)” manufactured by Toyo Ink Co., Ltd. This Rio Tran SS
Are sublimable dyes containing red, blue, yellow, each of the three primary colors and black, and are easy to adjust for hue and density, and are suitable for implementing the present embodiment. . Of course, not limited to Riotran SS, a water-soluble disperse dye which is dissolved or dispersed in fine particles in a solvent such as methyl ethyl ketone may be used. Also, solvent dyes,
For example, “Kayaset Blue F” manufactured by Nippon Kayaku Co., Ltd.
R, "Kayaset Blue A-2R", "Kayaset Red B", "Kayaset Red TD-FBconc", and "Kayaset Yellow GN" (all of which are trade names) can also be used.

Next, the plastic lens 1 as a chromosome is fixed to the lens holder 11 with the convex surface facing upward, and the squeegee elevating actuator 31 and the holder base elevating actuator 35 are driven, as shown in FIG. As shown in the drawing, the screen gauze 23 is sandwiched between the edge 25 of the squeegee 15 and the plastic lens 1 so as to be in close contact therewith, and the screen frame moving actuator 33 and the holder base rotating actuator 37 are driven. As shown by the arrow, the holder base 17 is rotated while the screen frame 13 is horizontally moved. Here, the oil-based ink 41 prepared as described above is placed on the screen gauze 23. As a result, the plastic lens 1
The oily ink 41 is screen-printed on the convex surface of the print image 21 through the portion of the print image 21 while being smoothed to a constant thickness by the squeegee 15, and the colored layer 43 having a uniform film pressure is formed.
Are formed.

After the colored layer 43 having a uniform film thickness is formed on the convex surface of the plastic lens 1, the squeegee elevating actuator 31 and the holder base elevating actuator 35 are driven to raise the squeegee 15, The holder base 17 is lowered. Then, the plastic lens 1 is removed from the lens holder 11.
After that, the plastic lens 1 is placed in a heating furnace after the colored layer 43 on the convex surface of the plastic lens 1 is dried. And 80 ° C to 160 ° C (more preferably 8 ° C to 160 ° C)
In order to perform the dry heat treatment within the range of 0 ° C. to 130 ° C., the inside of the heating furnace is heated to a temperature set as high as possible below the heat-resistant temperature of the plastic lens 1 and 5 minutes to 120 minutes (more preferably). The plastic lens 1 is taken out of the furnace after a predetermined time elapses in order to obtain a desired hue and density in a heating time of 20 minutes to 120 minutes. Then, the plastic lens 1 is immersed in an ultrasonic cleaning tank filled with a solvent such as methyl ethyl ketone, and the oily ink attached to the convex surface of the plastic lens 1 is removed by ultrasonic cleaning.

As described above, according to the present embodiment, not a wet working environment as in the conventional dip dyeing method,
The plastic lens 1 can be dyed in a dry working environment, the working environment can be improved, and the workability can be greatly improved. In addition, it is easy to develop a desired hue by preparing an oil-based ink constituting a colored layer transferred to the lens surface, and to easily perform dyeing of a desired density from light to dark. Can be. In particular, it is easy to dye a dark color that is difficult to obtain by the gas phase method. Also, there is no problem such as treatment of waste liquid as in the dyeing method, and excellent effects can be exhibited in terms of effective use of dyes. The dyeing method according to the present embodiment is particularly suitable, for example, when adopted as a method for mass-producing, for example, a function glass or a non-standard sunglass.

[0032]

[Embodiment 1] Next, an embodiment will be described. First, a first embodiment will be described. In this example,
The mesh size of the portion of the print image 21 of the screen gauze 23 was 200 mesh. Also,
As oil-based ink, Ryotran S manufactured by Toyo Ink Co., Ltd.
"T" manufactured by Seiko Advance Co., Ltd. at a weight ratio of 1: 1 to a mixture of the three primary colors of red, blue and yellow of S.
-910 (trade name; the same applies hereinafter) "as a medium and viscosity adjusted. Then, as a plastic lens 1, a polycarbonate type "CR-3"
9 (refractive index: 1.50), and the transfer device 10 described in the embodiment was used to perform screen printing using the above-described oil-based ink to form a colored layer on the convex surface of the plastic lens 1. . Next, the plastic lens 1 is placed in a heating furnace for dry heat treatment, and (1) 1
15 minutes and 30 minutes at 10 ° C, (2) 10 minutes at 120 ° C, 1
5 minutes, 20 minutes, 30 minutes, 45 minutes, 60 minutes, (3) 130
10 minutes at 20 ° C., 20 minutes and (4) 5 minutes at 160 ° C., 10 minutes
After performing the coloring step by changing the heating temperature and heating time to minutes, 20 minutes and 30 minutes, the ink adhering to the lens surface is removed in an ultrasonic cleaning tank filled with methyl ethyl ketone, and the coloring state is performed. Was visually confirmed. As a result, it was confirmed that, under any of the conditions, the optical characteristics of the lens were not affected, and that each of the desired hues could be dyed in a color development state without color unevenness. Further, it was also confirmed that the color development density gradually increased by increasing the heating time. In addition, the visual observation was performed from the viewpoint of whether or not there was no appearance defect, color unevenness, color omission (pinhole) or the like, and whether the color matched the target color. In addition, the plastic lens 1 after hard coating or multi-coating after dyeing was visually observed from the same viewpoint, but there was no problem.

Example 2 Next, the same dyeing method as in Example 1 was applied to the screen gauze 23 having a mesh size of 250 mesh, and the optical characteristics of the lens were not affected. It was confirmed that a good dyed plastic lens without color unevenness could be produced.

Example 3 Next, as the plastic lens 1, "NPL-16" having a refractive index of 1.60 and "N" having a refractive index of 1.67, which are lenses made of polyurethane resin, are used.
A colored layer is printed on the convex surface of the lens by screen printing using the same method as in Example 1 and Example 2 using PL-3 "(both are trade names of polyurethane resin lenses manufactured by Nidek Corporation). And then, under normal pressure, (1) 11
15 minutes at 0 ° C, 30 minutes, (2) 10 minutes at 120 ° C, 15 minutes
Minutes, 20 minutes, 30 minutes, 45 minutes, 60 minutes, (3) 130 ° C
After changing the heating temperature and heating time to 10 minutes and 20 minutes, respectively, and performing a coloring step, the ink adhering to the lens surface is removed in an ultrasonic cleaning tank filled with methyl ethyl ketone, and the coloring state is visually observed. Confirmed by As a result, it was confirmed that, under any of the conditions, the optical characteristics of the lens were not affected, and that each of the desired hues could be dyed in a color development state without color unevenness.
Further, it was also confirmed that the color development density gradually increased by increasing the heating time.

While one embodiment and several embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and each embodiment, and may be modified within the scope not departing from the gist thereof. Furthermore, it can be implemented in various modes.

For example, when dyeing a plastic lens using the dyeing method of the present invention, the conditions of the ink used include (1) a dye containing a sublimable dye, and (2) a viscosity that allows screen printing. (3) that a continuous film is formed after drying, and (4) that it can be easily removed with a solvent for washing, as long as it satisfies the above-mentioned conditions even if it is a water-based ink instead of an oil-based ink. Of course it can be used. Further, the dyeing method of the present invention can be employed when dyeing an object having a spherical convex surface other than a plastic lens with a sublimable dye. Furthermore, the transfer device of the present invention can be used not only for dyeing but also for performing screen printing on an object having a spherical convex surface.

[0037]

As described above, according to the dyeing method of the present invention, when dyeing a plastic lens, the working environment is improved, the density is easily adjusted, and the dyed plastic having a stable hue without unevenness is obtained. A lens can be manufactured. In addition to the plastic lens, the chromosome having a spherical convex surface can be stained with a desired hue and density in a favorable working environment. Furthermore, according to the transfer device of the present invention, it is possible to perform screen printing on the surface of an object having a spherical convex surface, not only for the purpose of dyeing.

[Brief description of the drawings]

FIG. 1 relates to a transfer device according to an embodiment, and FIG.
2 is a perspective view showing a main configuration of the device, and FIG. 2B is an enlarged sectional view of a main part.

FIG. 2 is a block diagram illustrating a schematic configuration of a drive system and the like of the transfer device according to the embodiment;

[Explanation of symbols]

1 ... plastic lens, 10 ... transfer device, 1
DESCRIPTION OF SYMBOLS 1 ... Lens holder, 13 ... Screen frame, 15
... Squeegee, 17 ... Holder base, 21 ...
Print image, 23 ... screen gauze, 25 ...
・ Edge, 31 ・ ・ ・ Squeegee lifting actuator,
33 ... Screen frame moving actuator, 35
··· Holder base elevating actuator, 37: Holder base rotating actuator, 41: Oily ink, 43: Colored layer.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) G02C 7/00 G02B 1/10 Z F term (Reference) 2C035 AA07 FA27 FA29 FC06 FC07 FD01 FD13 FD17 FD42 FD52 FF22 2H006 BA01 BA06 2K009 BB11 DD01 DD06 EE01 4H057 AA02 AA03 BA12 DA02 DA29 DA32 FA30 FA31 FA38 FA42 GA04 GA17

Claims (4)

[Claims] 1. A dyeing material in which a sublimable dye is dissolved or dispersed in fine particles is placed on the upper surface, and a screen gauze is stretched with a moderate tension enough to make it adhere along the spherical convex surface of the chromosome. Under the screen frame, while arranging the chromosome with the convex surface up, using a squeegee having an edge processed to be depressed with a curved shape substantially the same as the curved shape of the convex surface of the chromosome, With the screen gauze sandwiched between the squeegee and the convex surface of the chromosome, the screen frame and the squeegee are rotated while rotating the chromosome in a direction perpendicular to the width direction of the squeegee. The colored layer of the dyeing material is transferred to the convex surface of the chromosome by screen printing by relatively moving the squeegee in a direction perpendicular to the width direction of the squeegee, and thereafter, the transfer is performed. A sublimable dye in the colored layer thus obtained is sublimated and penetrated into the chromosome, and then the colored layer is removed. 2. The method for staining a chromosome having a curved surface according to claim 1, wherein the chromosome is a plastic lens. 3. The method for dyeing a chromosome having a curved surface according to claim 1 or 2, wherein the dyeing material is an oil-based ink in which a sublimable dye is dissolved or dispersed in fine particles. A method for staining a chromosome having: 4. A holder capable of fixing a printing medium having a spherical convex surface with the convex surface facing upward, and a holder arranged above the holder and loose enough to be able to adhere along the convex surface of the printing medium. A screen frame having a screen gauze stretched by tension; and a squeegee disposed above the screen frame and having an edge processed to be depressed in a curved shape substantially the same as the curved shape of the convex surface of the printing medium. By raising and lowering at least one of the squeegee and the holder, contact means for bringing the screen gauze into close contact with the convex surface of the printing medium and sandwiching the screen gauze between the printing medium and the squeegee, Rotating means for rotating the holder in a direction orthogonal to the width direction of the squeegee; and the screen frame and the squeegee are relatively moved in a direction orthogonal to the width direction of the squeegee. Transfer apparatus comprising: a moving means for moving.