JP3000751B2 - Base fabric for ink ribbon - Google Patents

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 serial dot printer and has excellent print clarity and durability of a welded portion of the base fabric.

[0002]

2. Description of the Related Art Conventionally, a thin base cloth having a thin base cloth is generally used as an ink ribbon base cloth having excellent print clarity.
In recent years, the number of conventional ink ribbons used in impact-type printers has been reduced, and long tape-shaped ink ribbons are folded and stored in cassettes, and both ends of the ink ribbons are welded (bonded) using an ultrasonic welder. The number of cassette-type endless printers is increasing. Normally, the ink ribbon is impacted by the head pin of the printer when printing, and is gradually destroyed. Life was affected. Therefore, the life of the weld is one of the important characteristics. The durability of the welded portion is inversely proportional to the thickness of the base fabric for the ink ribbon, and a thin base fabric using a thin denier yarn of 30D or less has significantly poor welded portion durability,
At present, it cannot be put to practical use.

[0003] As a means for improving the durability of a thin base fabric,
Japanese Patent Application Laid-Open No. 60-161184 proposes a technique in which the relative viscosity of sulfuric acid of a polyamide-based polymer is increased to 3.0 or more, and a high-stretching yarn is used with a high-strength yarn.

Japanese Patent Application Laid-Open No. Hei 2-231181 proposes a base fabric in which the denier of the weft is made higher than the denier of the warp with a thin yarn of 30D.

[0005]

However, there is no proposal for a technique for improving the durability of the welded portion of the ink ribbon, and at present it has not reached a practical level.

SUMMARY OF THE INVENTION An object of the present invention is to provide an ink ribbon having excellent print clarity and excellent durability at a welded portion of a base cloth.

[0007]

The present invention employs the following means in order to achieve the above object. That is,
The base fabric for an ink ribbon of the present invention is a warp constituting the base fabric,
And at least one of the wefts has a titanium oxide content of 0.15% by weight or less, and the total denier of both the warp and the weft is a polyamide multifilament yarn in the range of 5D or more and less than 20D. It is a feature.

[0008]

In the base fabric for an ink ribbon of the present invention, it has been determined that the content of titanium oxide is related to the durability of a welded portion of the base fabric in a thin base fabric using a thin thread of less than 20D. It is completed.

That is, when the content of titanium oxide in the yarn constituting the base fabric is specified in a thin base fabric using a thin yarn of less than 20D, surprisingly, the print clarity is good and the base fabric is welded. It has been found that it is possible to provide a member having excellent part durability. That is, in the base fabric for an ink ribbon of the present invention, the content of titanium oxide in at least one of the warp and the weft constituting the base fabric is 0.15% by weight or less, and the total denier is the warp and the weft. Both are in the range of 5D or more and less than 20D.

The ink ribbon made of such a base fabric for an ink ribbon has not only excellent print clarity but also excellent durability at a welded portion, and the polymer constituting the yarn preferably has a relative viscosity of sulfuric acid of 2.5 to 3.8. Use those. Since the stretching ratio may be an ordinary ratio, there is little trouble in the stretching step, the productivity is high, and a base fabric superior in cost can be provided.

As the polyamide in the present invention, nylon 66, nylon 6, nylon 46 and the like can be used. It is important that the denier of the yarn is less than 20D. If it is 20D or more, the durability of the base fabric is good, but the print clarity tends to decrease.If it is less than 5D, the print clarity is improved. It shows a tendency that the durability of the welded portion of the base fabric is further deteriorated.

The single yarn denier constituting such a yarn is preferably 0.6 to 3.0 denier, which is generally used, for forming a thin base fabric. If the single yarn denier is less than 0.6d,
The durability of the base fabric portion tends to decrease, and when the single yarn denier exceeds 3.0 d, the print clarity tends to deteriorate.

The number of twists of the warp and the weft is preferably 2
00 to 700 T / m, more preferably 250 to 600 T / m
Twisting in the range of T / m is good from the viewpoint of weaving property, but is not particularly limited. In particular, for weft yarns,
It may be untwisted.

In recent years, the mainstream of ink ribbons used in impact-type printers is a cassette type in which a long tape is folded and stored in a cassette. When this cassette type ink ribbon is printed on a printer, a printed spot (graphic spot) in which the bent portion is printed densely occurs. However, if the base cloth of the present invention is used as the ink ribbon, such a drawback is solved brilliantly. You. Further, such an effect is particularly remarkably exhibited in a base fabric of a thin woven fabric having a thickness of 30 to 110 μm and formed of the above-described yarn. Further, when the ribbon base cloth is printed by using a normal dot printer, the durability of the base cloth part is also improved.

As the fabric structure of the base fabric for the ink ribbon, plain weave, guided plain weave, twill weave, satin weave, and the like are generally used, but are not particularly limited thereto.

The woven fabric preferably has a woven fabric density of 200 to 600 yarns / in, more preferably 250 to 600 warps.
It may be 550 yarns / in, and the weft is preferably 120 to 40.
0 / in, more preferably about 150 to 350 / in.

The present invention has further clarified that the durability of the welded portion of the ink ribbon varies greatly depending on the content of titanium oxide in the filament yarn constituting the woven fabric. That is, in the present invention, the content of titanium oxide is 0.15% by weight.
Hereinafter, it has been found that the durability of the welded portion of the ink ribbon is greatly improved by forming the ink ribbon with a filament yarn of preferably 0.06% by weight or less.

After the above-mentioned woven fabric is woven, it is scoured by a usual method, preferably by liquid scouring, and then sieved with a pin tenter.
What is necessary is just to finish set in the range of 0 degreeC-200 degreeC. The ink ribbon base fabric of the present invention is formed on the ink ribbon by further adhering an appropriate amount of an ink material such as ordinary oil-based ink.

The base fabric for an ink ribbon of the present invention may have been subjected to appropriate post-processing such as high-pressure fluid processing, plasma processing, surfactant processing, and resin processing. The ink ribbon constituted by using the ink ribbon base fabric of the present invention thus obtained has excellent print clarity, is excellent in durability of the welded portion of the base fabric, and is superior in cost. It has the characteristic that there is.

[0020]

The present invention will be described below in detail with reference to examples. The evaluation method used in the present invention is as follows. [Durability of Welding Part of Base Cloth] The ink ribbon prepared above was cut once with scissors, and then a welding part was formed with an ultrasonic welder (M-8400, manufactured by Branson). In this example, seven welded portions were provided at substantially equal intervals to produce an endless ink ribbon.

24 pin dot printer (Epson U
P-130K), the endless ink ribbon is stored in the cassette, the cassette is set in the printer, alphabets and numbers are printed, and the number of prints when a pinhole occurs in the welded portion is read. The average value was taken as the durability of the welded portion of the base fabric.

◎: 1.12 million characters or more: 101 to 1.2 million characters △ to Δ: 81 to 1 million characters △: 61 to 800,000 characters △ to ×: 41 to 600,000 characters ×: 400,000 characters or less [Titanium oxide] Expected titanium oxide content Is 0.01-0.
In the case of 03%, 10 g of a completely dried sample (nylon multifilament) is collected, and the content is 0.1 to 0.3.
In the case of%, collect and use 0.7 g of a sample. The sample is placed in a crucible (50 ml made of porcelain), burned by an electric heater, and carbonized. Further, incineration is performed in an electric furnace at 700 to 800 ° C. for 2 hours. After cooling to room temperature, 2 to 4 g of potassium pyrosulfate is added, and the mixture is heated and melted with a gas flame to make titanium oxide a soluble salt.

After cooling to room temperature, 25 ml of a 20% sulfuric acid solution is added to the crucible to dissolve the salt. In addition, add 50 ml of lysate
Was washed with a small amount of water into a volumetric flask, and 5 ml of a 3% aqueous hydrogen peroxide solution was added to develop color, and water was added to the 50 ml mark line. The absorbance at 410 mμ using water as a blank is measured with a spectrophotometer, and the amount of titanium oxide (Ti: mg / ml) is determined from a calibration curve determined by the following method. The content of titanium oxide is determined by the following equation. Titanium oxide content (%) = [(Ti × 50 ml) / absolute dry sample weight] × 100 Method for preparing calibration curve Approximately 1 g of titanium oxide (special grade reagent) was dried at 105 ° C. for 4 hours, and 100 mg was placed in a crucible. Add 10 g of potassium pyrosulfate and heat and melt with a gas flame. In addition, 20% sulfuric acid 20
Dissolve this in 500 ml and transfer to a 500 ml volumetric flask,
Adjust to the marked line with% sulfuric acid. Samples of 5, 10, 15, and 20 ml of this solution were collected into 50 ml volumetric flasks, and 5 ml of a 3% hydrogen peroxide solution was added to develop a color.
Adjust to the marked line with sulfuric acid. For each solution, the absorbance at 410 mμ with water as blank was measured with a spectrophotometer, and the titanium oxide concentration (mg / ml) was taken on the X axis, and the absorbance was taken on the Y axis, and used as a calibration curve.

Examples 1 to 6, Comparative Examples 1 to 4 Titanium oxide content (% by weight) is 0.01%, 0.15%
% And 0.2% of each nylon 66 polymer (sulfuric acid relative viscosity: 2.85), 18D-17fil, 10D
Multifilament yarns of -17 fil and 5D -8 fil were prepared respectively. Furthermore, a 40D-34fil multifilament yarn having a titanium oxide content (% by weight) of 0.2% was prepared.

The multifilament yarn used for the warp of the woven fabric has a total denier of 40D, 18D, 10D.
280, 390, 56 for D and 5D respectively
Twisting of 0 and 790 T / m was performed, but non-twisting yarn was used for the weft. A woven fabric having a plain weave structure was prepared using each warp and weft.

These woven fabrics were scoured and finished and set according to the usual methods to prepare the woven fabrics shown in Table 1.

The obtained woven fabric was blown to a width of 13 mm to prepare a base fabric for an ink ribbon. An oil-based ink was applied to these base cloths at 22% by weight based on the weight of the base cloth to prepare an ink ribbon for a dot printer. With respect to these ink ribbons, the print clarity and the durability of the welded portion of the base cloth were measured, and the results are shown in Table 1.

[0028]

[Table 1]

As is evident from Table 1, those of Examples 1 to 6 were excellent in both print clarity and durability of the welded portion. In Comparative Examples 1 to 3, the print clarity was good, but the durability of the welded portion was poor and was not practical. In Comparative Example 4, although the durability of the welded portion was good,
The print clarity was poor.

[0030]

The base fabric for an ink ribbon of the present invention is excellent in both print clarity and durability of a welded portion, and is suitable for a high-speed printer, a high-copy printer and the like in which a thin base fabric is preferably used. We can provide ribbon.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B41J 31/02 B41M 5/10

Claims (4)

(57) [Claims] 1. A warp yarn and / or a weft yarn constituting a base fabric, wherein at least one of the yarns has a titanium oxide content of 0.15% by weight or less, and a total denier of 5D or more and less than 20D for both the warp and the weft. A base fabric for an ink ribbon, comprising a polyamide multifilament yarn according to any one of claims 1 to 3. 2. The ink ribbon base fabric according to claim 1, wherein the content of titanium oxide is 0.06% by weight or less. 3. The base fabric for an ink ribbon according to claim 1, wherein the content of titanium oxide is 0.02% by weight or less. 4. The base fabric for an ink ribbon according to claim 1, wherein the single yarn denier is in the range of 0.6 to 3 d.