JPS62199884A - Method for ink jet dyeing of cloth - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for freely controlling the shade of color when expressing a printed image on a fabric using an inkjet dyeing method.

(Prior Art) Conventionally, screen printing, roller printing, rotary printing, and transfer printing have been commonly used as methods for printing on fibrous structures. All of these printing methods require a plate-making process, and require a great deal of labor and time to produce. For this reason, there has been a problem in that it is difficult to meet the increasing demand for high-mix, low-volume production in today's world of fashion, which is becoming increasingly diverse.

In order to improve this problem, attention has recently begun to be paid to the application of inkjet recording methods, which have recently shown remarkable progress in the fields of paper recording and printing, to textile printing. In other words, it is a so-called computer graphics method in which images are directly reproduced on fabric using an inkjet recording device, and it has advantages that conventional printing methods do not have, such as thermal printing and quick response. A major drawback is that it is difficult to reproduce high-quality images in neutral or light colors.

It is. In other words, in the inkjet recording method, pale colors are generally expressed by lowering the dot density, but with this method, even if the color appears pale when viewed from a distance, it is recognized as a collection of dots when viewed up close; The result is a far cry from the pale color that can be obtained with traditional textile printing.

In the inkjet recording method, the following several methods have been proposed for expressing light colors and intermediate colors, but all of them have drawbacks and are not actually adopted.

(11i Method using multiple nozzles with different 1 degree: Multiple nozzles are required for each color used (4 colors of 1' cyan, magenta, yellow, and black are used), making the device complicated and expensive.

(2) Method of using a plurality of nozzles with different nozzle diameters to change the amount of ink ejection; Similar to (1) above, the device is complicated and expensive.

(3) How to change the ejection amount with the same nozzle: With on-demand nozzles that utilize the deformation of piezo elements, the voltage range applied to the piezo element in which droplets are stably ejected is narrow, resulting in large differences in ejection amount. It's hard to do.

(4) Method of diluting the concentration of ink by applying droplets other than ink: Ink and diluent are not mixed uniformly, which tends to cause color unevenness.

(Problems to be Solved by the Invention) An object of the present invention is to provide an efficient method that can easily express light colors or intermediate colors in inkjet dyeing.

(Means for Solving the Problems) An object of the invention is to inject an ink containing a dye decomposable by a reducing agent and an ink containing a reducing agent onto a fabric, at least a part of which is sprayed onto a fabric using separate inkjet nozzles. This is achieved by an inkjet dyeing method for fabrics, which is characterized in that the inkjet dyeing method is applied to fabrics so that they are in contact with each other.

In recent years, in order to perform non-contact recording and printing, printing devices have been developed that control ink ejected from 30 to 500 micron nozzles. Refers to things that are applied to dyeing. Many methods have been devised as the inkjet method. There are three main types of these methods, classified according to the method of generating ink droplets, and the method of the present invention can be applied to any of these methods. 1st
The method is a pressure pulse type (on-demand type) in which ink droplets are ejected from an orifice as needed using only the force of a piezoelectric element. The second method is a pressurized vibration type in which pressurized ink is ejected from pores in the form of a jet, and vibration is applied to the ink to break it up into droplets, while at the same time applying an electric charge to control this. The third method is an electrostatic acceleration type in which ink is drawn out from a nozzle by electrostatic attraction, whereas the second method described above jets pressurized ink from pores.

Furthermore, recently, in order to increase the speed, development studies are underway on bubble jets and slit jets, and these can also be applied to the method of the present invention.

One of the features of the present invention is the use of a dye that can be decomposed with a reducing agent. The dyes used vary depending on the fibers that make up the fabric, but include disperse dyes, acid dyes, cationic dyes, direct dyes, metal-containing dyes, vat dyes, naphthol dyes, and sulfur dyes.

In the present invention, a first dye containing the dye and further containing an anti-drying agent, a viscosity modifier, a surface tension modifier, a fiber swelling agent, a fungicide, an oxygen absorber, a chelating agent, etc. The ink is printed onto fabric using an inkjet nozzle.

Another feature of the invention is that a second ink (but not the dye in the first ink) containing a reducing agent capable of decomposing these dyes is applied to the fabric with an inkjet nozzle. be.

The reducing agent used in the present invention essentially only needs to have the ability to reduce the dye used. l,? Examples of zinc compounds include formaldehyde sulfoxylic zinc salts (Zinc), typified by dechlorin;
5alt of formaldehydesalf
In addition, sodium sulfoxylate formaldehyde, typified by Rongalit,
yde) Others include hydrosulfide, thiourea dioxide, and brucaris. As described above, the material is not limited to these, and any material may be used as long as it decomposes the dye by reduction and eliminates the coloring.

The general usage of the reducing agent differs depending on the dye used and the fiber structure; for example, for disperse dyes/polyester fibers, cationic dyes/polyacrylonitrile fibers, stannous chloride or alkalis are preferably used, and for acid dyes/polyester fibers, tin chloride or alkalis are preferably used. For polyamides and acid dyes/wool, dechlorin is preferably used.

Also to this ink containing a reducing agent, an anti-drying agent, a viscosity modifier, a surface tension modifier, a PH modifier, etc. are added as necessary.

The present invention applies the above two types of ink to a fabric using separate inkjet nozzles.
These two types of ink need to be applied so that at least a portion thereof is in contact with the fabric. That is,
At least a portion of these two types of ink is applied to the fabric so that at least a portion of the dots on the fabric overlap, or at least a portion of these two types of ink is mixed by movement such as bleeding of both or one of the inks. There is a need.

To achieve this, the position, size, density, etc. of the ink dots 281 are adjusted, and the ink bleeding characteristics of the fabric are adjusted.

A plurality of the above dye inks can be used. Usually four colors are used: yellow, cyan, magenta, and black.
The number of dye inks is not limited in the present invention.

In addition, a plurality of reducing agent inks may be used, and inks with different reducing agent concentrations or inks using different types of reducing agents may also be used.

In the present invention, the degree of decomposition of the dye can be controlled by adjusting the amounts of the dye and reducing agent applied to the fabric. That is, adjustment of the dye concentration in the dye ink and the size, position, and dot density of the ink dots when applied to the fabric by inkjet, and the reducing agent concentration of the reducing agent ink and the adjustment of the dot density when applied to the fabric by inkjet. By appropriately adjusting the size, position, and dot density of the ink dots, it is possible to achieve a state in which the applied dye is hardly decomposed to a state in which the applied dye is almost decomposed. As a result, light colors and intermediate colors, which have been difficult to achieve with inkjet dyeing, can be easily achieved.

Compared to the method using dark and light inks, the method of the present invention can obtain a light color by using at least one reducing agent ink for multiple dye inks, so the number of inkjet nozzles is small, and the equipment is simple. It also has advantages in terms of economic development and cost reduction.

As described above, the feature of the present invention is that the dye ink and the reducing agent ink are applied to the fabric by inkjet, but the order in which the two types of inks are applied to the fabric is not particularly limited. In order to avoid blurring of printed designs due to dye ink bleeding, it is preferable to apply the reducing agent after applying the dye ink.

The fabric to which the dye and reducing agent have been applied by inkjet is then dyed using a normal coloring method, for example, 100 to 190°C by the steam method, and about 180°C by the thermosol method.
The dye may be fixed and colored by heat treatment at ~220°C.

At this time, the decomposition of the dye by the applied reducing agent also proceeds at the same time, and the dye is decomposed and lightened at the same time as it is fixed.

In addition, in the case of a combination of a dye and a reducing agent that decomposes at a temperature below the above-mentioned heat treatment temperature (for example, room temperature), the dye may be decomposed in advance and then the above-described dye-fixing coloring treatment may be performed.

After such fixation and color development, soaping treatment may be performed as necessary. This can improve the color fastness of dyed products.

(Example) The following dye ink and reducing agent ink were created.

Dye ink: Miketon Polyester Disehar
ge Blue R (Mitsui Toatsu Chemical)
100g/M Kimitsurugin LZ (Kimitsu Chemical Industry) 2g/#Reducing agent ink: Chiclite (Tokai Denka Industries) 40g/j Kimitsurugin LZ (Kimitsu Chemical Industries) 2g/j 5 micron cut paper for both dye ink and reducing agent ink I blurted it out. Then, it was inserted into a desiccator connected to an aspirator, and degassed at 20 mHg for about 1 hour. The degassed ink was applied to the polyester filament fabric from an inkjet nozzle under the following conditions.

■ Inkjet method: On-demand type ■ Nozzle diameter = 60 μ ■ Distance GL between nozzle and fabric: 1 m ■ Piezo voltage applied: 40 ■ Ink dot density dye ink: 16 dots/1Il12 reducing agent ink:
7 levels of 0 to 16 dots/l 1 l 12 ■ Ink application order After applying the dye ink, apply the reducing agent ink, air dry after applying the ink, and dry at 180℃ using superheated steam for 10 minutes.
Processed for minutes. Next, soaping was performed to remove the reducing agent.

The L value of the dyed product was measured using a digital colorimeter manufactured by Suga Test Instruments Co., Ltd. The results are shown in Table 1 and FIG. The color density decreased almost in proportion to the dot density of the applied reducing agent, and an intermediate color or light color was obtained.

(Effects of the Invention) The present invention easily provides medium to light colors in inkjet dyeing, which has conventionally been difficult. As a result, compared to conventional inkjet printing,
It is now possible to obtain prints with a three-dimensional effect that is rich in shadows.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the relationship between dot density and L value in Examples. Patent applicant Masato Azuma Toshi Co., Ltd.
Patent Attorney Takeshi Saito Production Patent Attorney Ryoji Kawase Contents of the engraving of the drawing: No changes) Figure 1 Dot Density Dot/77177L2 Procedural Amendment (Method) May 13, 1985 Commissioner of the Patent Office Michi Uga Department 1. Indication of the case 1985 Patent Application No. 40405 2. Name of the invention Inkjet dyeing method for fabric 3. Person making the amendment Relationship to the case Name of patent applicant (316) Toshi Co., Ltd. 4. Name of agent Patent attorney (7175) Takehiko Saito 5 Date of amendment order April 22, 1986 6 Drawings attached to the application subject to amendment

Claims (2)

[Claims] (1) An ink containing a dye decomposable by a reducing agent and an ink containing a reducing agent are applied to the fabric using separate inkjet nozzles so that at least a portion of the ink is in contact with the fabric. Inkjet dyeing method for fabrics. (2) The inkjet dyeing method for fabric according to claim 1, wherein the degree of decomposition of the dye is controlled by adjusting the amounts of dye and reducing agent applied.