JPH1181081A - Ink ribbon - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain ink ribbon having good durability in melting part and base fabric part by producing an ink ribbon base fabric by polyamide multifilament yarn fabric having a specific relative viscosity range in sulfuric acid and a specific range of titanium oxide content. SOLUTION: An ink ribbon base fabric is produced from a fabric in which polyamide multifilament yarn having 3.0-3.8 (preferably 3.1-3.6) relative viscosity in sulfuric acid and <=0.15 wt.% (preferably <=0.06 wt.%) titanium oxide content is arranged in warp and/or weft and an ink material is attached to the base fabric to provide the objective ink ribbon.

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 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.

[0003] Cassette type ink ribbons include an endless ribbon formed by welding (adhering) both ends of a tape with an ultrasonic welder, and a seamless ribbon formed by cutting a woven fabric in a bag shape in the width direction into an endless shape. There is.

As an ink ribbon base fabric, Japanese Patent Application Laid-Open No. Sho 60-1
No. 61184 has been proposed, which describes a thin base fabric composed of fine yarn having a single yarn denier of 1 d or less and a total denier of 25 D or less. As a means for improving the durability of the base fabric portion, US Pat. There is introduced a method of increasing the relative viscosity of sulfuric acid of a polyamide-based polymer to 3.0 or more, and using a high-strength drawn yarn with high strength.

[0005]

First, the former endless ink ribbon having a welded portion is impacted by a pin of a printer head when printing, and is gradually destroyed. At present, the durability is extremely weaker than that of the base cloth, and the durability of the welded portion is one of the important characteristics because the life of the welded portion affects the life of the ink ribbon.

[0006] There have been no proposals for improving the durability of the welded portion, which have been introduced so far, and the present situation is that the welded portion is practically used with its durability kept low.

[0007] In the case of the latter seamless ribbon having no welded portion, usually, the perimeter of the bag-shaped fabric becomes the length of the ink ribbon in order to cut the fabric woven in the shape of a bag in the width direction. At present, the durability of the base cloth portion is extremely short because printing is repeated while ink is supplied.

Finally, the ink ribbon disclosed in Japanese Patent Application Laid-Open No. 60-161184 uses a multifilament yarn having a high relative viscosity of sulfuric acid because the ink ribbon is composed of a single denier yarn as thin as 1 d or less. Although the yarn formed by adopting the method of stretching at a magnification is used,
In the ink ribbon formed by such a method, the durability of the welded portion cannot be improved, and the durability of the base fabric portion is not satisfactory. In addition, such a method has problems that yarn breakage is liable to occur in the drawing step and operability is low.

The present invention has been made in view of the above technical background, and has as its object to provide an excellent cassette type ink ribbon 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 to solve the above-mentioned problems.

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

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention focuses on a welded portion of an ink ribbon, which has not been noticed at all in a conventional ink ribbon,
As a result of intensive studies, the present inventors have found out that the durability of not only the welded portion but also the base fabric portion is greatly improved.

That is, according to the present invention, a polyamide multifilament yarn constituting an ink ribbon base fabric which satisfies a specific sulfuric acid relative viscosity range and a specific range of titanium oxide content has the above-mentioned excellent effects. It has been completed after ascertaining what is achieved. That is, according to the present invention, it is possible to stably provide an ink ribbon base fabric for a cassette type having both excellent durability at the welded portion and the base fabric portion.

The polyamide multifilament yarn constituting the 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 3.0.
The ink ribbon base fabric using the polyamide multi-filament yarn has an excellent durability at the welded portion and the durability of the base fabric portion. When used as a seamless ink ribbon for a cassette, which has no welded portion but has a short ribbon length and requires the durability of the base cloth part, a base cloth which can be developed extremely superiorly is used. 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 fabric, is particularly preferably used.

Such an ink ribbon base fabric is composed of a woven fabric using the multifilament yarn as at least one of a warp and a weft.

The content of titanium oxide in the polyamide multifilament yarn is 0.15% by weight or less, preferably 0.1% by weight.
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 fabric portion are undesirably reduced.

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 in the range of If it is less than 3.0, the durability of the welded portion and the base fabric are low. If it exceeds 3.8, the durability of the welded portion and the base fabric are improved.
Since the yarn breakage in the yarn drawing process increases and the operability decreases, the production becomes difficult economically.

The total denier of the warp and the weft comprising such a multifilament yarn is preferably 15 to 1
A range of 00D is used. The single yarn denier is preferably from 1.1 to 3.0 d, more preferably 1.15.
Those having a range of up to 2.5 d are preferable. Single yarn denier is 1.1
If the value is less than d, yarn breakage is likely to occur in the yarn drawing step, and the durability of the base fabric portion is further deteriorated. 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 to 500 T / m.
Twisting in the range of 0 to 400 T / m is preferable from the viewpoint of weaving, but is not particularly limited. By setting the number of twists, particularly the number of twists of the warp, in the above range, it is preferable from the viewpoint of improving printing unevenness called graphic unevenness.

The woven structure of the ink ribbon base fabric of the present invention is generally a plain weave, a guided plain weave, a twill weave, a satin weave, or the like, but is not particularly limited thereto. The weaving density varies depending on the denier of the yarn,
It is preferable that the number of wefts is about 100 to 180 / in.

After weaving by the above-mentioned method, scouring is carried out by a usual method or liquid scouring, etc.
The ink ribbon base fabric of the present invention is manufactured by finish setting in the range of ° C.

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

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

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 the base fabric is used for an endless seamless ink ribbon for a cassette having no welded portion, the base fabric is obtained. It is excellent in part durability and not only can prevent the pins of the printer head from being caught or broken, but also can have the characteristic of extending the life of the ink ribbon.

[0027]

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

The evaluation method in the embodiment is as follows.

[Durability of Welding Part of Base Cloth] The ink ribbon prepared above was once cut with scissors, and then a welding part was formed with an ultrasonic welder (M-8400 manufactured by Branson) to form an endless ink. Created a ribbon. Seven welds were provided at substantially equal intervals in an ink ribbon having a total length of 13 m.

The endless ink ribbon was housed in a cassette for a 24-pin dot printer (UP-130K, manufactured by Epson), and the cassette was set in the printer, and letters and numbers were printed. The number of prints at that time was read, and the average value was taken as the durability of the welded portion of the base fabric. 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 XX: 1.5 million characters or less.

[Durability of the base cloth portion] The ink ribbon was cut to a length of 1 m with scissors in the same manner as in the durability of the welded portion, and then welded by an ultrasonic welder to produce an endless ink ribbon.

The endless ink ribbon is housed in a cassette for a 24-pin dot printer (UPS-130K manufactured by Epson), the cassette is set in the printer, and letters and numbers are printed. 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 base fabric durability.

The evaluation criteria are as follows. ◎: 8.41 million characters or more: 771 to 8.4 million characters to ７: 701 to 7.7 million characters: 631 to 7 million characters 〜 to ×: 561 to 6.3 million characters ×: 491 to 5.6 million characters XX: 4.9 million characters or less.

[Relative viscosity of sulfuric acid] 0.25 g of a completely dried sample (nylon multifilament, etc.) was added to 25 ml of 98% sulfuric acid.
, And inject 15 cc into the Ostwald viscometer.
At 0 ° C, the flow time t (sec) of the solution from the upper line to the lower line of the Ostwald viscometer is measured.

In the same operation, the flow time t0 (sec) of only 98% sulfuric acid at 25 ° C. is measured, and the relative viscosity of sulfuric acid is determined by the following equation.

Sulfuric acid relative viscosity (ηr) = (t / t0) +
1.891 (1.000-C) C = (sample weight × 1.8311 / sample solution weight) × 100 [content of titanium oxide] The expected titanium oxide content is 0.0
In the case of 1 to 0.03% by weight, 10 g of a completely dried sample
Put into a ml porcelain crucible, burn with an electric heater and carbonize. 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 the soluble salt to room temperature, 25 ml of a 20% sulfuric acid solution is added to the crucible to dissolve the salt. Further, the lysate was washed into a 50 ml volumetric flask together with a small amount of water, and 5 ml of a 3% hydrogen peroxide solution was added to emit light.
Add water to the 50 ml mark and combine. 410 with a spectrophotometer
The absorbance (.lambda.0) with water as a blank at m.mu. is measured, and the amount of titanium oxide (Ti) is determined from the absorbance (.lambda.0).

The amount of titanium oxide (Ti) can be determined as the amount of titanium oxide on the X-axis at the absorbance (λ0) point of the calibration curve obtained by the following method. This value (Ti) is substituted into the following equation to determine the titanium oxide content.

Titanium oxide content (%) = (Ti × 50 ml /
Absolutely dried sample weight) × 100 (Method of preparing calibration curve) About 1 g of titanium oxide (special grade reagent) was dried at 105 ° C. for 4 hours, 100 mg was placed in a crucible, 10 g of potassium pyrosulfate was added, and the mixture was heated and melted with a gas flame. Further, the melt was dissolved in 20 ml of 20% sulfuric acid, and 500 ml of the solution was dissolved.
And add 5% sulfuric acid to match the marked line. 5, 10, 15 and 20 ml of this solution are sampled in a 50 ml volumetric flask, and 5 ml of 3% hydrogen peroxide solution is added to develop a color. Then, the solution is adjusted to the marked line with 5% sulfuric acid.

Each of these solutions was measured with a spectrophotometer at 41.
The absorbance at 0 mμ with water as a blank was measured, 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 1-5, Comparative Examples 1-8 The titanium oxide content (% by weight) was 0.01%, 0.1%,
And 0.2% of each polymer, 40D-34 filaments having a sulfuric acid relative viscosity of 3.02, 3.28, 3.80, 3.03, 3.30 (single yarn fineness is 1.2 d).
(Examples 1 to 5).

Further, for each polymer having a titanium oxide content of 0.01% by weight, 0.1% and 0.2%,
Sulfuric acid relative viscosity is 4.02, 4.10, 3.10, 3.3.
Nylon 66 multifilament yarns having 40D-34 filaments (having a single yarn fineness of 1.2 d) of 1, 3.84 and 4.03 were prepared (Comparative Examples 1 to 6).

The titanium oxide content is 0.01% by weight.
Nylon 66 multifilament yarn (Comparative Example 7) of 40D-68 filament (single yarn fineness is 0.6d) having a sulfuric acid relative viscosity of 3.20 and a titanium oxide content of 0.0
40D-3 having 1% by weight and a sulfuric acid relative viscosity of 2.85.
Nylon 66 with 4 filaments (single yarn fineness is 1.2d)
Multifilament yarns (Comparative Example 8) were prepared.

In the multifilament yarn, the yarn used for the warp of the woven fabric was twisted at 280 T / m.
The weft used was not twisted. Plain weave fabrics were prepared using the respective warps and wefts. These woven fabrics were scoured and finished and set by a usual method. The obtained woven fabric was blown to a width of 13 mm to prepare an ink ribbon base fabric. To these base cloths, 22% by weight of oil-based ink was applied based on the weight of the base cloth to prepare an ink ribbon for a dot printer.
With respect to these ink ribbons, the durability of the welded portion and the durability of the base fabric portion were measured, and the results are shown in Table 1.

[0044]

[Table 1] As is evident from Table 1, those of Examples 1 to 6 had few yarn breakage in the yarn drawing step, and both the welded portion durability and the base fabric portion durability were good.

In Comparative Examples 1 and 2, although the durability of the welded portion and the durability of the base fabric portion were good, the yarns were frequently broken in the yarn drawing process and the yield was low, so that they could be economically produced. It was not 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.

[0046]

EFFECT OF THE INVENTION The ink ribbon of the present invention has extremely excellent durability at the welded portion and at the base fabric portion, and is used for an endless ribbon cassette having a welded portion or an endless seamless ribbon having no welded portion. An ink ribbon suitable for a cassette can be provided.

Claims (7)

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