JPS62141079A - Printing ink for synthetic resin and printing on synthetic resin with said ink - Google Patents

Abstract

PURPOSE:To obtain the titled ink capable of showing a letter clearly, by mixing a vehicle comprising an acrylic resin as matrix with a disperse dye and an additive for improving the properties of an ink. CONSTITUTION:A printing ink for synthetic resins (A) is obtained by mixing a vehicle comprising an acrylic resin of a molecular weight of 30,000-300,000 as matrix with an additive for improving the properties of an ink and, if necessary, one or more of yellow, red, and blue disperse dyes which have a feature of penetrating into the synthetic resin material and a small difference in sublimation temperature from each other. A suitable pattern is printed with the ink A on the surface of a bright-colored resin material 1, which is heated at 120-160 deg.C for 2-10min to allow part of the ink A to penetrate into the resin material 1 and then immersed in a chemical fluid 3 to remove an unnecessary part a2 of the ink A that has not penetrated into the material 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an ink that can clearly display characters even on dark-colored synthetic resin materials, and a printing method using the ink.

[Technical background of the invention and its problems]

As is well known, to display characters (including symbols and figures) on synthetic resin materials, ink is used that has a disperse dye as a base material, and the colorant penetrates into the resin layer. However, this ink cannot be used for all synthetic resins with different characteristics; for example, it is difficult to paint and print on polyacetal resin materials with poor surface activity, and it is difficult to print on light-colored resin materials with a dark background. There were inconveniences such as difficulty in displaying characters. As a means of displaying light-colored characters on a dark-colored background, there is an engraving method in which recesses corresponding to the displayed characters are engraved on the surface of a dark-colored resin material, and light-colored ink is applied to the recesses, and light-colored resin is used. Generally, a two-color molding method is used, in which a display character part is molded using a mold, and then a resin material is integrally molded with a dark-colored resin using the character part as a male mold. However, the stamping method and two-color molding method have the disadvantage that they require advanced technology to mold the entire shape and are expensive.

[Purpose of the invention]

Therefore, the present invention provides an ink that can be printed on various synthetic resins, and an ink that can be used to clearly and easily print and display light-colored characters even on dark-colored backgrounds. It is in.

[Summary of the invention]

The ink for synthetic resins of the present invention consists of a colorless printing ink in which an additive that improves the ink function is mixed into a vehicle made of an acrylic resin with a molecular weight of 30,000 to 300,000 as a base material, and a sublimation temperature difference between the ink and the ink. Colored sublimation ink is a mixture of one or more types of yellow, red, and blue disperse dyes, which have a small amount of color.The sublimation ink is printed in an appropriate pattern on the surface of a light-colored resin material, and the printing part is heated to transfer the ink into the material. Printing that did not penetrate into the material by removing the main parts of the ink that did not penetrate and displaying dark-colored characters on a light-colored background, or coloring the material after printing with at least a well-known dye. The unnecessary portions of ink and the unnecessary dyed layer of colored dye are removed using a chemical solution to display light-colored characters on a dark-colored background.

[Embodiments of the invention]

First, to explain the colored ink for synthetic resin of the present invention, the ink consists of a dye, a vehicle, and an additive (auxiliary agent).The dye is dissolved in the vehicle, and the synthetic resin material 1
Specifically, one or more types of yellow, red, and blue disperse dyes with a sublimation temperature of 200°C or less are used, preferably yellow, red, and red disperse dyes with the same sublimation temperature difference are used. , using a colorant mixed with a blue disperse dye, using acrylic resin, methyl acrylate, methyl methacrylate, etc. as the vehicle base material, using xylene, toluene, benzene, etc. as the vehicle solvent, and using additives. includes those that further improve or adjust the various functions of ink;
For example, an ink fluidity regulator, a drying property regulator, a colorant concentration regulator, a gloss resistance regulator, etc. are used.

Prescription example of sublimation ink (A) according to the present invention (ink base properties)
Specifically, ■ Acrylonitrile styrene 40ben
Zen 30 Barium sulfate 17 Disperse dye 13 Carbon
2.5 ■ Methyl methacrylate 40 tons
Luene 30 Zinc oxide (ZnO), 17 Disperse dye
13 Power - Bon 1
The colorless ink (B) according to the present invention is the above-mentioned sublimation ink from which the colorant is removed. Specific formulation examples of the ink include: ■ Methyl acrylate 45 x
20 Toluene 10 Calcium oxide (Cab) 12 Methyl acrylate 45 Benzene
5 Kishin
20 toluen
Magnesium pentoxide (
MgO) 12 carbon
First, the synthetic resin printing method according to the present invention will be explained in order: (1) At least the dark-colored sublimation ink A of the invention, that is, a vehicle having an acrylic resin as a base material, is applied to the surface of the light-colored resin material 1. , a printing process of displaying colored sublimation ink A consisting of a dark disperse dye and additives in an appropriate pattern;
A heating process in which a part of the printing ink A penetrates into the interior of the resin material 1 and the material 1 and the ink A are fused, and an unnecessary part a2 of the printing ink A adhering to the surface of the material 1 is removed by the chemical solution 3. The removal process is performed in order, and dark-colored characters 2 made of printing ink A are displayed on the light-colored background 1a.

(II) A printing step of displaying at least the colorless ink B of the invention, that is, the colorless ink B consisting of a vehicle made of an acrylic resin as a base material and an additive, in an appropriate pattern on the surface of the light-colored resin material 1. , a coloring step in which the entire surface of the printing material 1 is dyed with a dark-colored conventional dye, and a removal step in which unnecessary portions b2 of the printing ink B that have not penetrated into the material 1 and the dye-dyed layer d2 are removed using a chemical solution 3. The light colored characters 12 of the material 1 are displayed on the dark colored dye background 1b.

(III) On the surface of the light-colored resin material 1, at least the light-colored sublimation ink A of the invention, that is, a vehicle having an acrylic resin as a base material, and a light-colored disperse dye different from the material 1;
After the printing process of displaying the sublimation ink A consisting of and additives in an appropriate pattern, the light-colored characters 2 of the printing ink A are displayed on the dark colored dye background 1b through the same process as the above printing method (2). It is something.

(IV) In the printing method of (II) and (III) above,
After the dye coloring process, first a removal process is performed to remove the printing ink main part a2 or b2 that has not penetrated into the material 1 and the dye dyed layer d2, and then a heating process is performed to remove the material 1.
The printing ink dye a1 or bl and the dye dyeing layer d1 that have penetrated into the material 1 can further penetrate deeper into the material 1 and fuse with the material 1.

(V) In the printing method of (II) (m) above, after the dyeing step, a heating step is first performed to further penetrate the printing ink dye a or bl and the dye dyed layer d1 deeper into the material 1. At the same time, the printing ink main part a2 which was fused with the material 1 and then subjected to a removal process and did not penetrate into the material 1;
Alternatively, even if b2 etc. are removed, the same result as in (IV) above can be obtained.

(VI) In the printing method of (II), (III), (IV), and (V) above, after the coloring step, a reduction step is performed to remove the unnecessary dyed layer d2 that has not penetrated into the material 1, and a removal step is performed. If unnecessary parts a2 or b2 of the printing ink are removed in the step, the amount of staining of the chemical solution 3 in the removal process can be halved.

(■) If washing with water is performed after the coloring step, removal step, and heating step, staining of the chemical solution can be further reduced.

In the printing method of (1)(n)(m) above, the printing plate 5 is used as a means for printing sublimation inks A and B on the resin material 1.
A recess 6 corresponding to the displayed characters is provided in the recess 6, and the ink A or B of the present invention is poured into the recess 6. After filling the ink A or B evenly in the recess 6, a pad 7 made of silicone rubber is inserted toward the recess 6. The ink A or B filled in the recess 6 is adsorbed onto the pad 7, and the pad 7 with the ink A or B adsorbed is raised from the printing table 5 and lowered toward the printing section of the resin material 1. Then, pad printing (also referred to as tacho printing or tampon printing) is used in which ink A or B adsorbed on the pad 7 is printed on the surface of the resin material 1.

In the printing method (II) (nu) above, the coloring process for the printing material 1 is carried out by spraying or coating the printing material 1 evenly with a colored dye mixed with a disperse dye, or by coating the printing material 1 with a colored dye mixed with a disperse dye. A dye solution is added and the temperature is raised to 75 DEG C. or higher, preferably 80 to 100 DEG C., and the dye is allowed to settle in the dye solution for at least 1 minute, preferably 15 to 20 minutes, to form a color.

In the removal process after coloring, 1% sodium hydroxide (NaOH) 1% hydrosulfide 1% reducing chemical solution 13
The printed and colored material 1 is heated to 00°C and allowed to sink for 2 to 12 minutes in this chemical solution 13, and the printing ink A is
The dye D laminated on top of the material 1, that is, the unnecessary dye-free dyeing layer d2 that has not penetrated into the material 1 is removed.

Furthermore, the heating step in (I) (II) ([1) above,
Material 1 with tampon printing or material 1 with tampon printing and coloring treated at a temperature of 120 to 160°C.
It is heated for 0 minutes to allow the printing ink A or B and the dye to penetrate from the surface of the material 1 to a depth of about 60 μm, and to fuse the material 1 and the ink A or B.

Example 1 Resin material 1...Polyoxymethylene (P
Printing ink A: When the colored sublimation ink of ink formulation example (I) was used, ink A penetrated into material 1 by about 50 μm.

Character 2 was clear and had no blurred outline.

Example 2 Resin material 1... Polybutylene terephthalate (PBT) resin was used, and printing ink A... Colored sublimation ink of ink formulation example (II) was used. Ink A had penetrated into material 1 by about 40μ.

The outline of character 2 was clear and did not bleed.

Example 3 Resin material 1: Material using polyethylene terephthalate (PET) resin, Printing ink B: Colorless ink of ink formulation example (III) The characters 12 displayed by No. 1 were clear and had no blurred outline.

It should be noted that the printing ink according to the present invention and the method of printing synthetic resin using the ink are not limited to the above embodiments, and screen printing or transfer printing can be used as printing means for printing inks A and B on the resin material 1. , or letterpress printing or the like may also be used.

The chemical liquid 3 used in the removal step is selected according to the type of the resin material 1 and the ink A or B printed on it, and the means for coloring the printing material 1, the means for removing unnecessary parts, the heating means, etc. Any changes can be made as appropriate as long as they do not go against the gist of the present invention.

〔Effect of the invention〕

Therefore, by using an acrylic resin as a vehicle, the sublimation ink of the present invention can display dark-colored characters on a light-colored background as before, and can also be printed on synthetic resins, which could not be printed up until now. This has the great advantage of making printing possible, and it also makes it possible to clearly display light-colored characters on dark-colored backgrounds, which has been difficult until now. Furthermore, the sublimation ink of the present invention and the method of printing synthetic resin using the ink are extremely simple, and can be produced at a lower cost than the two-color molding method. This has a significant practical effect on improvement.

[Brief explanation of drawings]

Figure 1 is a process diagram showing the sublimation ink of the present invention and a printing method using the ink, Figure 2 is a similar process diagram, and Figures 3 to 5 are composites formed using the ink and printing method of the present invention. FIG. 6 is a partially cutaway perspective view of the resin product, and FIG. 6 is a perspective view showing an example of a printing process. 1...Synthetic resin material, LA, LB...Skin, 2,
12... Characters, 4... Processing layer, 5... Print stand, 6...
... Concavity, 7... Batt, A, B... Ink of the present invention, a process, b□,... Ink dyeing layer, 821bZ...
Ink main part, D... dye, d□... dye dyed layer,
d2... Dye-dyed layer, 3, 13... Chemical solution --=.

Claims (1)

[Scope of Claims] 1) A colorless printing ink for synthetic resins, in which an acrylic resin-based vehicle is mixed with additives that improve ink functionality. 2) Printing ink for colored synthetic resins consisting of a disperse dye that penetrates into the interior of synthetic resin materials, a vehicle using acrylic resin as a base material, and additives that improve ink functionality. 3) The acrylic resin of the vehicle has a molecular weight of 30,000 to 3
00000, and the disperse dye is a mixture of one or more types of yellow, red, and blue dyes with a small difference in sublimation temperature. 4) A printing process of displaying an appropriate pattern on the surface of the light-colored resin material 1 with a dark-colored sublimation ink A consisting of a vehicle with at least an acrylic resin as a base material, a dark-colored disperse dye, and an additive, and printing. A heating process in which a part of the ink penetrates and fuses into the material, and an ink removal process in which unnecessary parts a_2 of the printing ink that did not penetrate into the material are removed using chemical solution 3 are performed in order, and the printing ink is applied to the light-colored background 1a. A synthetic resin printing method for displaying dark-colored characters 2 according to A. 5) A printing process of displaying an appropriate pattern of colorless ink B consisting of a vehicle and additives in which at least an acrylic resin is used as a base material on the surface of the light-colored resin material 1, and a printing step of displaying a dark-colored dye D on the printing material. The synthetic resin is then sequentially subjected to a coloring step of dyeing, and a removal step of removing unnecessary parts b_2 of printing ink and unnecessary dyed layer d_2 of dye using chemical solution 3, and displaying light-colored characters 12 of the material on dark-colored dye-colored background 1b. printing method. 6) A printing process of displaying sublimation ink A consisting of at least a light-colored disperse dye different from the material, a vehicle made of acrylic resin as a base material, and additives in an appropriate pattern on the surface of the light-colored resin material 1; , coloring process of dyeing dark dye D, printing ink unnecessary area a_2 and dye unnecessary dyeing layer d_
A synthetic resin printing method in which light-colored characters 2 of printing ink A are displayed on a dark dye-colored background 1b by sequentially performing a removal step of removing 2 with a chemical solution 3. 7) After the removal process, a heating process is performed to fuse the material 1 and the ink and dye that have penetrated into it, forming an ink-dyed layer a_1.
The synthetic resin printing method according to claims 5 and 6, wherein the dye-dyed layer d_1 is stabilized. 8) A heating process is performed between the coloring process and the removal process, and material 1
The synthetic resin printing method according to claims 5 and 6, wherein the ink and dye permeated therein are fused to stabilize the ink dyed layer a_1 and the dye dyed layer d_1. 9) After the coloring process, a reduction process is performed to remove the unnecessary dyed layer d_2 of the unnecessary dye that did not penetrate into the material 1, and in the removal process, the unnecessary part a_2 of the ink that did not penetrate into the material is removed. The synthetic resin printing method according to the scope 5, 6, 7, and 8.