JPH10297066A - Base cloth for ink ribbon - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a basic cloth for ink ribbon composed of polyamide multifilament in which the color developing properties of a basic dye based ink principally employed in an ink ribbon can be enhanced by setting pH of the basic cloth within a specified range. SOLUTION: Polyamide multifilament of polyamide based resin, e.g. nylon 46, nylon 66 or nylon 6, is employed and a basic cloth composed of such a multifilament is prepared such that the pH comes within 5-7.5. Sulfuric acid relative viscosity of polymer composing the polyamide multifilament is preferably in the range of 2.4-3.8 and the content of titanium oxide in the multifilament is 0.15% or less. Preferably, a multifilament thread employs strands of 150-70 T/m. The basic cloth is produced as a cloth having warp density of 130-600/in and weft density of 100-400/in.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink ribbon base fabric which is used in an impact type printer and has excellent ink coloring properties.

[0002]

2. Description of the Related Art It is well known that an ink ribbon is used as a typewriter, a register, a printer ribbon for a word processor or a printer ribbon for a computer. Such an ink ribbon transfers characters included in the ribbon to printing paper by a character writing mechanism such as a typewriter or a printer, and forms characters. Therefore, the material of the ink ribbon has a large mechanical resistance to an impact. Synthetic fibers such as polyamide and polyester have come to be mainly used. However, ink ribbons made of these synthetic fibers are suitable for various purposes, such as an antifungal agent for preventing the generation of mold or attaching an oil agent or a sizing agent during the production, weaving, knitting and processing of synthetic fibers. The ink ribbon base fabric may be immersed in a chemical, for example, by applying the ink to the original fabric for the ink ribbon or the base fabric for the ink ribbon, or by washing with a chemical solution to remove dirt or the like. When the agent is applied in this manner, there are problems such as poor color development of the ink and discoloration of the ink.

[0003]

Since no technique has been proposed for improving the color developability of the ink used in the ink ribbon, in view of such problems, the color developability of the basic dye-based ink mainly used in the ink ribbon is improved. It is an object to provide an ink ribbon.

[0004]

The present invention employs the following means to achieve the above object.

That is, the base fabric for an ink ribbon of the present invention is characterized in that, in the base fabric for an ink ribbon made of polyamide multifilament, the pH of the base fabric is 5 to 7.5.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The base fabric for an ink ribbon according to the present invention comprises:
It has been completed by investigating that there is a relationship between the pH of the slit ribbon-like base cloth at the stage before absorbing the base cloth or the ink and the coloring property of the basic dye-based ink.

That is, in a base fabric for an ink ribbon,
If the base fabric is neutral, it will not change the components of the ink little and will not hinder the color development of the ink, but
Surprisingly, it has been found that by setting the pH of the base fabric for an ink ribbon to a specific range, it is possible to provide an ink having excellent color developing properties.

As the polyamide multifilament used in the present invention, a filament made of polyamide resin such as nylon 46, nylon 66, nylon 6, nylon 610, nylon 11, nylon 12, etc. can be used. As the multifilament constituting the base fabric for the ink ribbon, preferably, 40 denier and 34 filament yarns are mainly used. However, the present invention is not limited to this. Larger ones can be used. In addition, the number of filaments can be increased from one or more.

The relative viscosity of sulfuric acid of the polymer constituting the polyamide multifilament is preferably 2.4 to 4.0.
A value of 3.8 is preferable from the viewpoint of the durability of the fused portion and the durability of the character required for the ink ribbon. Furthermore, the content of titanium oxide contained in such a multifilament yarn is 0.1
Although 5% or less is preferable, it is not particularly limited to this. Such a multifilament yarn is preferably 15
Although a twisted yarn of 0 to 700 T / m can be used, it is preferable to use it as a non-twisted yarn from the viewpoint of cost reduction by omitting the twisted yarn. In the present invention,
Good weaving properties can be obtained without performing confounding treatment with compressed air in the raw yarn production stage. However, in order to further enhance the weaving properties, it is possible to perform a confounding treatment of preferably 5 to 100 pieces / m. .

The fabric structure of the base fabric for an ink ribbon comprising such multifilament yarns is plain weave, guided plain weave,
Twill weave and satin weave can be used, but are not particularly limited thereto. The woven fabric density of such woven fabric is preferably 130 to 600 yarns / in, more preferably 140 to 550 yarns / in, and the weft is preferably 100 to 400 yarns / in, and more preferably 110 yarns.
Those having a range of ３５０350 / in are used. In such a woven fabric, the warp and the weft may use the same fiber, but need not be the same.

The base fabric for an ink ribbon thus obtained is
After weaving, it is subjected to the usual scouring and finishing set.
It is preferable to use a material that is finished and set in the range of 160 ° C. to 240 ° C. with a pin tenter.

The pH of the ink ribbon base fabric is adjusted to 5 to 7.5 at the same time as the scouring. By adjusting the pH to such a value, it is possible to provide an ink having excellent coloring properties. Such a base fabric for an ink ribbon may have been subjected to appropriate post-processing such as high-pressure fluid processing, airflow processing, plasma processing, surfactant processing, and resin processing. The pH may be adjusted to the range of 5 to 7.5.

[0013] The ink ribbon base cloth may be formed by adhering (impregnating) an appropriate amount of ink material such as a normal oil-based ink to the base cloth and then fusing to form an endless ink ribbon. . Such fusing is performed using an ultrasonic welder at both ends of the ink ribbon base fabric. The ink ribbon thus obtained has a characteristic that the ink has excellent color development when printed.

[0014]

The present invention will be described below in detail with reference to examples. The evaluation method used in the present invention is as follows. [Measurement method of pH]
g of the solution is placed in 100 ml of distilled water or pure water, and the mixture is appropriately stirred at room temperature. After 2 hours, the pH of the solution is measured with a pH meter.

[Coloring property] A basic dye-based ink manufactured by Sakata Ink was impregnated into a base fabric for an ink ribbon of each pH shown in Table 1 measured by the above-described method for measuring pH, and a 24-pin printer (Epson) (UP-130K) was used to print on printer paper, and the color development of the printed ink was evaluated with the naked eye. The evaluation criteria are as follows.

：: Good color developability ：: Very good color developability Δ: Poor color developability Examples 1 to 4 and Comparative Examples 1 to 4 40 denier consisting of nylon 66 polymer having a sulfuric acid relative viscosity of 2.85. A 34-filament yarn was produced, and the multifilament was used as a warp and a weft without twisting to produce a woven fabric having a plain weave structure having a weave density of 208/123 and a weft of 123 / in. These woven fabrics were scoured and finished and set according to the usual methods to produce base fabrics for ink ribbons shown in Table 1. These base fabrics for ink ribbons were adjusted to pH shown in Table 1 with caustic soda or phosphoric acid.
Was obtained.

Further, the coloring properties of the obtained base fabrics for ink ribbons having different pHs were evaluated, and the results are shown in Table 1.

[0018]

[Table 1] As is clear from Table 1, those of Examples 1 to 4 had better coloring properties than Comparative Examples 1 to 4. Examples 1 and 2 were particularly excellent in color development.

In contrast to these examples, the color developing properties of Comparative Examples 1 to 4 were clearly poor when judged by the naked eye.

[0020]

The base fabric for an ink ribbon of the present invention provides a base fabric for an ink ribbon, in which the dye-based ink has a good coloring property and printed characters and the like are clear and easy to see.

Claims (6)

[Claims] 1. An ink ribbon base fabric comprising a polyamide multifilament, wherein the base fabric has a pH of 5-7.
5. A base fabric for an ink ribbon, which is in the range of 5. 2. The polyamide multifilament according to claim 1, wherein
2. The base fabric for an ink ribbon according to claim 1, wherein the base fabric is made of a polymer having a relative viscosity of sulfuric acid of 2.4 to 3.8. 3. The polyamide multifilament according to claim 1,
The base fabric for an ink ribbon according to any one of claims 1 to 2, having a titanium oxide content of 0.15% or less. 4. The polyamide multifilament according to claim 1, wherein
The base fabric for an ink ribbon according to any one of claims 1 to 3, which is a twisted yarn of 50 to 700 T / m or a non-twisted yarn. 5. The base fabric for an ink ribbon according to claim 1, wherein said base fabric is a woven fabric having a warp density of 130 to 600 yarns / in. 6. The base fabric for an ink ribbon according to claim 1, wherein said base fabric is a woven fabric having a weft density of 100 to 400 yarns / in.