JPH07100392B2 - Ink ribbon base cloth - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cassette type endless ink ribbon base cloth used in an impact printer.

[0002]

2. Description of the Related Art Ink ribbons used in impact printers include a spool type and a cassette type in which a long tape-shaped ink ribbon is folded and stored in a cassette.

The cassette type ink ribbon includes an endless ribbon formed by welding (adhering) both ends of a tape with ultrasonic welders, and a seamless ribbon formed by cutting a woven fabric in a bag shape in the width direction to form an endless form. There is.

As an ink ribbon base cloth, JP-A-60-1
No. 61184 has been proposed, which describes a thin base fabric composed of thin yarns having a single yarn denier of 1 d or less and a total denier of 25 D or less, and as a means for improving the durability of the base fabric portion. A method has been introduced in which the relative viscosity of sulfuric acid of a polyamide-based polymer is increased to 3.0 or more, and high-stretch-stretched yarns are used.

[0005]

First of all, the former endless ink ribbon having a welded part is impacted by a pin of a printer head during printing and gradually destroyed, but the above-mentioned welded part is usually broken. At present, the durability is extremely weaker than that of the base cloth portion, and the life of the welded portion influences the life of the ink ribbon. Therefore, the durability of the welded portion is one of the important characteristics.

No proposal has been introduced so far for improving the durability of the welded portion, and the present situation is that the welded portion is in practical use with the durability kept low.

Regarding the latter seamless ribbon having no welded portion, since the bag-shaped woven fabric is usually cut in the width direction, the peripheral length of the bag-shaped fabric becomes the length of the ink ribbon. In the present situation, the durability of the base cloth portion is extremely short because printing is repeated while ink is replenished.

Finally, the ink ribbon of JP-A-60-161184 uses a multifilament yarn having a high relative viscosity of sulfuric acid to form an ink ribbon with a thin single yarn denier yarn of 1d or less, Although a yarn formed by adopting a method of drawing at a magnification is used,
With the ink ribbon formed by such a method, the durability of the welded part cannot be improved, and the durability of the base cloth part is not satisfactory. Moreover, in such a method, there is a problem that yarn breakage is likely to occur in the drawing step and the operability is low.

In view of the above technical background, the present invention is to provide an excellent cassette type ink ribbon base fabric in which the durability of the welded portion and the durability of the base fabric portion are simultaneously improved.

[0010]

The present invention employs the following means in order to solve the above problems.

That is, the ink ribbon base fabric of the present invention is
It is characterized by comprising a woven fabric composed of polyamide multifilament yarn having a titanium oxide content of 0.15% by weight or less and a sulfuric acid viscosity in the range of 3.0 to 3.8.

[0012]

The present invention has focused on the welded portion of the ink ribbon, which has not been paid attention to by the conventional ink ribbon, and as a result of diligent study, the fact that the durability of the base cloth portion as well as the welded portion is significantly improved was found. It was done.

That is, according to the present invention, as the polyamide multifilament yarn constituting the ink ribbon base fabric, one satisfying a specific sulfuric acid relative viscosity range and a specific range of titanium oxide content has the above-mentioned excellent effects. It was completed by investigating what to achieve. That is, according to the present invention, it is possible to stably provide an ink ribbon base fabric for a cassette type, which is excellent in both the welded portion durability and the base fabric portion durability.

The polyamide multifilament yarn constituting the above-mentioned woven fabric of the present invention has a titanium oxide content of 0.1.
5% by weight or less and a sulfuric acid relative viscosity of 3.0 to 3.
The ink ribbon base fabric using such a polyamide multifilament yarn is in the range of 8, and since the durability of the welded portion and the durability of the base fabric portion are both good, an ink ribbon for an endless cassette having a welded portion When used as a seamless ink ribbon for cassettes that do not have a welded part but have a short ribbon length because the ribbon has a short durability, a base fabric that can be extremely superiorly developed. It can be provided.

The polyamide multifilament yarn referred to in the present invention is a multifilament yarn composed of polymers such as nylon 66, nylon 6 and nylon 46.

Of these, nylon 66, which has excellent performance in terms of durability of the base cloth, is particularly preferably used.

The ink ribbon base fabric is made of a woven fabric in which the multifilament yarn is used as at least one of warp and weft.

The content of titanium oxide in the polyamide multifilament yarn is 0.15% by weight or less, and preferably 0.1.
It is preferably 10% by weight or less, particularly preferably 0.06% by weight or less. That is, if it exceeds 0.15% by weight, the durability of the welded portion and the durability of the base cloth portion are deteriorated, which is not preferable.

The relative viscosity of sulfuric acid of the polyamide multifilament yarn is 3.0 to 3.8, preferably 3.1 to 3.6.
Must be within the range. When it is less than 3.0, the welded part durability and the base cloth part durability are low, and when it exceeds 3.8, the welded part durability and the base cloth part durability are improved,
Since the yarn breakage in the yarn drawing process increases and the operability is deteriorated, the production becomes economically difficult.

The total denier of the warp and weft made of such multifilament yarn is preferably 15 to 1
The range of 00D is used. Single yarn denier is preferably 1.1 to 3.0 d, more preferably 1.15.
It is preferably in the range of up to 2.5 d. Single yarn denier 1.1
If it is less than d, yarn breakage is likely to occur in the yarn drawing process, and the durability of the base fabric portion is deteriorated, which is not preferable. If the single yarn denier exceeds 3.0 d, the ink absorbency of the base fabric tends to decrease, which is not preferable.

The number of twists of the above-mentioned warp and weft is preferably 200 to 500 T / m, more preferably 25.
Additional twisting in the range of 0 to 400 T / m is preferable from the viewpoint of weavability, but is not particularly limited. The number of twists, particularly the number of twists of the warp, is preferably set in the above range in order to improve the print unevenness called the graphic unevenness.

A plain weave, an induction plain weave, a twill weave, a satin weave, and the like are generally applied as the woven design of the ink ribbon base fabric of the present invention, but are not particularly limited thereto. Weaving density varies depending on the denier of the yarn, but the warp is 160
Approximately 330 yarns / in and weft yarns are preferably 100 to 180 yarns / in.

After weaving by the above-mentioned method, it is scoured by a usual method or liquid scouring, and 160-200 by a pin tenter.
The ink ribbon base fabric of the present invention is manufactured by finishing setting in the range of ° C.

The ink ribbon base fabric of the present invention is formed into an ink ribbon by further adhering an appropriate amount of an ordinary ink material such as an oil-based ink.

The ink ribbon base fabric of the present invention may of course be further subjected to appropriate post-treatments such as high-pressure fluid treatment, plasma treatment, surfactant treatment, and resin treatment.

When the base fabric of the present invention is used for an endless ink ribbon for a cassette having a welded portion, the durability of the welded portion is excellent, and when used for an endless seamless ink ribbon for a cassette having no welded portion, a base fabric is used. It is excellent in part durability, and can have a feature that not only can the pin of the printer head be prevented from being caught or broken, but also the life of the ink ribbon can be extended.

[0027]

EXAMPLES The present invention will be described in detail below with reference to examples.

The evaluation method in the examples is as follows.

[Durability of Welding Section of Base Fabric] The ink ribbon prepared above is once cut with scissors, and then a welding section is prepared by an ultrasonic welder (M-8400 manufactured by Branson Co., Ltd.) to form an endless ink. I made a ribbon. Seven of the welded portions were provided in the ink ribbon having a total length of 13 m at substantially equal intervals.

The endless ink ribbon was housed in a cassette for a 24-pin dot printer (UP-130K manufactured by Epson), the cassette was set in the printer, letters and numbers were printed, and a pinhole was formed in the welded portion. The number of prints at that time was read, and the average value was taken as the durability of the welded part of the base cloth. The evaluation criteria are as follows. ◎: 2.5 million characters or more ○: 231 to 2.5 million characters ○ to △: 211 to 2.3 million characters △: 191 to 2.1 million characters △ to ×: 171 to 1.9 million characters ×: 151 to 1.7 million characters × ×: 1.5 million characters or less.

[Durability of base cloth portion] Similar to the durability of the welded portion, the ink ribbon was cut to a length of 1 m with scissors and then welded by an ultrasonic welder to prepare an endless ink ribbon.

The endless ink ribbon was stored in a cassette for a 24-pin dot printer (UP-130K manufactured by Epson), the cassette was set in the printer, letters and numbers were printed, and a pinhole was formed on the base cloth portion. The number of prints at the time of occurrence was read, and the average value was converted into the number of prints per 13 m, which was defined as the durability of the base cloth.

The evaluation criteria are shown below. ◎: 841 million characters or more ○: 771 to 8.4 million characters ○ to △: 701 to 7.7 million characters △: 631 to 7 million characters △ to ×: 561 to 6.3 million characters ×: 491 to 5.6 million characters × ×: 4.9 million characters or less.

[Sulfuric Acid Relative Viscosity] 0.25 g of absolutely dried sample (nylon multifilament, etc.) is added to 25 ml of 98% sulfuric acid.
Dissolve in, and inject 15cc into Ostwald viscometer,
The temperature of the solution flowing from the upper line to the lower line of the Ostwald viscometer, t (sec), is measured at ℃.

In the same manner, the flowing time t ₀ (sec) of only 98% sulfuric acid at 25 ° C. is measured, and the relative viscosity of sulfuric acid is determined by the following formula.

Sulfuric acid relative viscosity (ηr) = (t / t ₀ ) +
1.891 (1.000-C) C = (Sample weight x 1.831 / Sample solution weight) x 100 [Titanium oxide content] The expected titanium oxide content is 0.0
In the case of 1 to 0.03% by weight, 50 g of an absolutely dried sample is used.
Place in a ml porcelain crucible and burn with an electric heater to carbonize. Further, it is incinerated 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 the soluble salt to room temperature, 25 ml of 20% sulfuric acid solution is added to the crucible to dissolve the salt. Furthermore, the lysate was transferred to a 50 ml volumetric flask together with a small amount of water, and 5 ml of 3% hydrogen peroxide solution was added to cause light emission.
Add water to the 50 ml mark and combine. 410 with a spectrophotometer
The absorbance (λ ₀ ) is measured at mμ with water as a blank, and the amount of titanium oxide (Ti) is determined from this absorbance (λ ₀ ).

The amount of titanium oxide (Ti) can be determined as the amount of titanium oxide on the X axis at the absorbance (λ ₀ ) point of the calibration curve obtained by the following method. This value (Ti) is substituted into the following equation to obtain the titanium oxide content rate.

Titanium oxide content (%) = (Ti × 50 ml /
(Absolute dry sample weight) × 100 (Method of creating calibration curve) About 1 g of titanium oxide (special grade reagent) is dried at 105 ° C. for 4 hours, 100 mg is put in a crucible, 10 g of potassium pyrosulfate is added, and the mixture is heated and melted by a gas flame. Further, dissolve the melt with 20 ml of 20% sulfuric acid to obtain 500 ml.
Transfer to a measuring flask of and add 5% sulfuric acid to the marked line. Each of 5, 10, 15 and 20 ml of this solution was collected, placed in a 50 ml volumetric flask, added with 5 ml of 3% aqueous hydrogen peroxide to develop color, and then marked with 5% sulfuric acid to the marked line.

For each of these solutions, use a spectrophotometer
The absorbance at 0 mμ was measured with water as a blank, and a graph was prepared with the titanium oxide concentration (mg / ml) on the X axis and the absorbance on the Y axis. This graph is a calibration curve.

Examples 1-8, Comparative Examples 1-9 Titanium oxide contents (wt%) are 0.01%, 0.1%,
Nylon 66 multifilaments of 40D-34 filaments having sulfuric acid relative viscosities of 3.0, 3.3, 3.8, and 4.0 were prepared for each and 0.2% of each polymer. Further, a nylon 66 multifilament of 40D-68 filament (single yarn fineness of 0.6d) having a titanium oxide content of 0.01% by weight and a sulfuric acid relative viscosity of 3.2, a titanium oxide content of 0.01. 40D-34 filament nylon 66 multifilament yarn with a sulfuric acid relative viscosity of 2.85% by weight, and 40D-34 filament nylon with a titanium oxide content of 0.2% by weight and a sulfuric acid relative viscosity of 3.23. 66 multifilaments were prepared respectively.

This multifilament yarn was further twisted at 280 T / m for the yarn used for the warp of the woven fabric.
As the weft yarn, a yarn without additional twist was used. A plain weave fabric was prepared using each warp and weft. These woven fabrics were refined and finish-set by a usual method to produce the woven fabrics shown in Table 1. The obtained woven fabric was melt-cut to a width of 13 mm to prepare an ink ribbon base fabric. 22% by weight of the oil-based ink was applied to these base fabrics with respect to the weight of the base fabric to prepare an ink ribbon for a dot printer. With respect to these ink ribbons, the welded portion durability and the base cloth portion durability were measured, and the results are shown in Table 1.

[0042]

[Table 1]

As is clear from Table 1, in Examples 1 to 6, there were few yarn breakages in the yarn drawing process, and the durability of the welded portion and the durability of the base cloth portion were good.

In Comparative Examples 1 and 2, although the welded portion durability and the base fabric portion durability are good, many yarn breakages occur in the yarn drawing process and the yield is low, so that they are economically producible. It wasn't something. Comparative Examples 5 and 6 had poor welded part durability, and Comparative Examples 3, 4, 7, and 8 had poor welded part durability and base cloth part durability.

[0045]

INDUSTRIAL APPLICABILITY The ink ribbon base fabric of the present invention is extremely excellent in both the welded portion durability and the base fabric portion durability, and can be used for an endless ribbon cassette having a welded portion or an endless shape having no welded portion. An ink ribbon suitable for a seamless ribbon cassette can be provided.

Claims (7)

[Claims] 1. A woven fabric composed of polyamide multifilament yarn having a titanium oxide content of 0.15% by weight or less and a sulfuric acid viscosity in the range of 3.0 to 3.8. Ink ribbon base cloth. 2. The ink ribbon base fabric according to claim 1, wherein the content of titanium oxide is 0.10% by weight or less. 3. The ink ribbon base fabric according to claim 1, wherein the content of titanium oxide is 0.06% by weight or less. 4. The ink ribbon base fabric according to claim 1, wherein the viscosity of sulfuric acid is in the range of 3.1 to 3.6. 5. The ink ribbon base fabric according to claim 1, wherein the shape of the ink ribbon is an endless seamless ribbon having no welded portion. 6. The ink ribbon base fabric according to claim 1, wherein the form of the ink ribbon is an endless ribbon having a welded portion. 7. The ink ribbon base fabric according to claim 1, wherein the polyamide multifilament yarn has a total denier of 20 to 100 D and a single yarn denier of 1.1 to 3 d.