JP2000118108A - Ink ribbon base fabric and ink ribbon - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture an ink ribbon base fabric of long life provided with superior ink retention properties, long printing life and superior durability of fusion bonding sections. SOLUTION: An ink ribbon base fabric is constituted of a polyamide multi- filaments. In that case, weaving yarns constituting length direction of the base fabric are constituted of weaving yarns thicker by 1.1-3.0 times than the weaving yarns constituting the width direction. The ink ribbon is constituted of the above base fabric.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base fabric for an ink ribbon which is used in a cassette type and has an excellent printing life and durability of a fused portion.

[0002]

2. Description of the Related Art An ink ribbon is used for a typewriter, a register, a computer ribbon, and the like, and transfers ink in the ink ribbon to printing paper by a mechanical impact such as a dot pin or a metal type plate. Therefore, synthetic fibers such as polyamide fibers having high mechanical resistance to impact are mainly used as the material. However, ink ribbons made of these synthetic fibers are superior in durability to conventional cotton and silk, but are inferior in ink retention. Therefore, the life of printing is short, and in recent years it has become difficult to respond to high-speed and high-impact printers, and it has good ink retention and long printing life. A durable ink ribbon has been desired.

On the other hand, recently, an ink ribbon used in an impact-type printer has a long tape-shaped ink ribbon folded and stored in a cassette, and both ends of the ink ribbon are welded (welded) by an ultrasonic welder to be endless. An endless type having a fusing portion in a shape is mainly used.

Normally, the ink ribbon is impacted by the head pins of the printer when printing, and is gradually destroyed. Since the above-mentioned fused portion fuses and joins the fibers, the fibers are polymerized and the fiber structure is collapsed, so the life is shorter and the durability is weaker compared to the base fabric portion. Since the life of the ink ribbon affects the life of the ink ribbon, there is an increasing demand for improving the durability of the fusion spliced part especially in a cassette type ink ribbon having a fusion spliced part.

[0005] Conventionally, fiber-forming polyamides and N-
From a fiber obtained by melt-mixing and spinning a substituted piperazine ring-containing polyamide, an N-substituted piperazine ring-containing polyamide is removed by a liquid flow treatment, and a technique having a hollow portion in the fiber is disclosed in Japanese Patent Publication No. 49-6564. Proposed.

Japanese Patent Publication No. Sho 44-44772 proposes a technique having a plurality of groove-like or hoof-like hollow portions in which at least a part of the outer periphery is opened in the fiber cross section.

[0007] However, the technique having the hollow portion is effective as a means for increasing the ink retention and extending the life of the ink. However, the ink ribbon becomes bulky. However, there is a problem that the storage length of the ink ribbon is short and the durability is poor.

On the other hand, the ratio of the single yarn denier in the length direction to the width direction constituting the base fabric is set to a specific range, and the single yarn denier in the length direction is made thicker than the yarn in the width direction, so that the durability of the fused portion is improved. Japanese Patent Laid-Open No. 6-27 describes a means for simultaneously improving the printing life and printing life.
No. 8345. However, increasing the denier of single yarn reduces the number of single yarns of the multifilament, and as a result, the gap of the multifilament yarn is reduced, so that the amount of ink that can be applied to the base fabric and impregnated is reduced. As a result, the effect of improving the print life is adversely affected, which is insufficient.

That is, in order to increase the space between the multifilament yarns and improve the ink holding ability, it is effective to increase the total fineness rather than increase the single yarn denier. In addition, in this technology, in addition to increasing the single denier of the warp, the effect of increasing the total fineness is also disclosed.However, the effect of the total fineness is shown, and the total fineness and the single yarn denier ratio are shown. Since an appropriate range is not sufficiently shown, there is a problem that the effect of increasing the total fineness has not been clarified.

[0010] Further, regarding the durability of the fused portion, if the single yarn denier ratio of the yarns constituting the base fabric is set to a specific range, the melting of the yarn in the longitudinal direction when fusion-bonded becomes incomplete. Discloses that the printing durability of the fused portion is improved. Certainly, incompletely dissolving the yarn at the fused portion would cause the fused portion to have a large fiber structure and improve the printing durability against the impact of the dot pin, but increase the single yarn denier. There is a problem that a sufficient effect cannot be obtained by just using the method. In other words, in order to effectively incompletely dissolve the yarn at the fused portion, the use of a yarn having a large total fineness greatly improves the effect.

[0011]

SUMMARY OF THE INVENTION In view of the background of the prior art, the present invention has an excellent ink holding property, a long printing life, and a long ribbon life which is excellent in the durability of the fused portion. It is intended to provide a base fabric for an ink ribbon.

[0012]

The present invention employs the following means in order to solve the above-mentioned problems. That is, in the base fabric for an ink ribbon of the present invention, in the base fabric for an ink ribbon made of polyamide multifilament, the woven yarn constituting the length direction of the woven fabric is 1.1 to 1.1 times the woven yarn constituting the width direction. It is characterized by being composed of 3.0 times thicker yarn. Further, the ink ribbon of the present invention is characterized by being constituted by such a base cloth.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a base fabric for an ink ribbon made of a polyamide multifilament, the base fabric woven by using denier yarn thicker than the width direction yarn for the yarn constituting the length direction. The cloth has surprisingly been found to be excellent in ink retention and printing durability, and to significantly improve the durability of the welded portion.

Usually, the multifilament constituting the base fabric for the ink ribbon is a 40-denier, 34-filament yarn having the same thickness as the warp and the weft.

[0015] The inventors of the present invention have found that, in such an ink ribbon base fabric, the structure of the lengthwise woven yarn and the widthwise woven yarn constituting the base fabric, particularly the lengthwise woven yarn constituting the base fabric. The relationship between the total fineness of the woven yarn in the width direction and the ink retention of the base fabric and the durability of the welded portion was studied diligently.

First, as a point for improving the printing life, it is important that the base cloth absorb as much ink as possible. Therefore, as a result of examining the ink absorbency of the base cloth, when the ink is applied to the base cloth, the ink is retained in a large amount in the yarn constituting the length direction of the base cloth. It has been found that the amount of ink absorbed by the woven yarn increases.

Next, as a result of examining the points for improving the durability of the welded portion, when the ink ribbon is melt-bonded by the ultrasonic welder, the plasticization of the fiber is reduced as much as possible, and the fiber structure is appropriately formed at the melt-bonded portion. It is important that they form. That is, by using a thick woven yarn in the length direction of the ink ribbon, the fibers in the surface layer of the ribbon are less likely to be melted, and a large number of fiber structures can be formed in the fusion bonding portion.

The total fineness of the woven yarn in the length direction with respect to the width direction of the base fabric is 1.1 to 3.0 times, preferably 1.1.
If it is up to 2.0 times, a large effect is exhibited substantially in proportion to the total fineness. That is, when the total fineness is less than 1.1 times, the effect of the present invention cannot be obtained because the difference in the thickness of the woven yarn between the width direction and the length direction of the base fabric is small. On the other hand, if the total fineness exceeds three times, the difference in the total fineness between the lengthwise woven yarn and the widthwise woven yarn constituting the base fabric becomes too large, so that the weaving property deteriorates, and The overall fineness of the weaving yarn used in the width direction is reduced, the printing durability is reduced, the stiffness in the width direction of the base fabric is weakened, and the running property of the ink ribbon in the cassette is poor, and the practicality is poor. It is not preferable.

Further, in the present invention, if the single yarn fineness constituting the woven yarn used in the width direction and the length direction is preferably in the range of 1.2 to 2.1 denier, the ink holding property is reduced. It is effective without any effect.

The total denier of the woven yarn used in the present invention is preferably 40 to 90% for the woven yarn in the length direction of the base fabric.
Denier, more preferably in the range of 50 to 70 denier is used. In the width direction yarn, preferably 30 to 60 denier, more preferably 40 to 50 denier.
A yarn in the denier range is used. By using such a woven yarn, the effects of the present invention can be exhibited without increasing the thickness of the base fabric.

In such a base fabric, the weaving density is preferably 150 to 220 yarns / inch in the length direction, and preferably 100 to 140 yarns / inch in the width direction.
By setting the weave density in the range of inches, the durability of the base fabric can be improved.

Further, when a normal oil-based ink is applied to the base fabric of the present invention and melt-bonded by an ultrasonic welder to be used as a cassette type endless ink ribbon, an ink having excellent printing life and durability at a welded portion is obtained. A ribbon can be provided.

Polyamide multifilament is used as the woven yarn constituting the base fabric. Examples of the polyamide include nylon 46, nylon 66, nylon 6, nylon 610, nylon 11, and nylon 12.
Etc. can be used. Further, the relative viscosity of sulfuric acid of the polyamide is preferably in the range of 2.4 to 3.8, and more preferably in the range of 2.8 to 3.2, from the viewpoint of both the durability of the fused portion and the durability of the base fabric. . Further, the content of titanium oxide contained in the polyamide multifilament is preferably as small as possible, preferably 0 to 0.15% by weight,
More preferably, the content is 0 to 0.1% by weight in view of the durability of the fused portion.

As the fabric structure of the base fabric for an ink ribbon, preferably, plain weave, guided plain weave, twill weave, satin weave and its modified structure can be used, but it is not particularly limited thereto.

The base fabric for an ink ribbon thus obtained is
After weaving, it is subjected to the usual scouring and finishing set.
Preferably scouring by liquid scouring, 160 ° C with a pin tenter
It is preferable to finish set in the range of -240 ° C. Thereafter, an appropriate amount of an ink material such as a normal oil-based ink is applied (impregnated) to the base cloth and then fused to form an endless ink ribbon. Such fusion is carried out by using an ultrasonic welder at both ends of the ink ribbon base fabric.

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, airflow processing, plasma processing, surfactant processing, and resin processing.

The ink ribbon constructed using the ink ribbon base fabric of the present invention thus obtained has the characteristics of good ink retention, excellent print life, and excellent welded part durability.

[0028]

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 Fused Part> The base fabric for the ink ribbon of the sample was blown to a width of 13 mm, cut once with scissors to a total length of 1 m, and then oil-based ink was applied to these base fabrics with respect to the weight of the base fabric. 22% by weight, and then fused by an ultrasonic welder (M-8400 manufactured by Branson). Seven fused portions were provided at substantially equal intervals in the ink ribbon to form an endless shape. Created an ink ribbon.

This ink ribbon was housed in a cassette for a 24-pin dot printer (UP-130K, manufactured by Epson Corporation), 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 fused portion of the ink ribbon.

The evaluation criteria are as follows.

◎: 610,000 characters or more ○: 51 to 600,000 characters △: 41 to 500,000 characters ×: 400,000 characters or less <Ink life> The ink ribbon base fabric of the sample is blown to a width of 13 m, and once cut into 1 m with scissors. Then, 22% by weight of the oil-based ink was applied to these base cloths based on the weight of the base cloth, and then an ultrasonic welder (M-8 manufactured by Branson) was applied.
400) to form an endless ink ribbon.

The ink ribbon was housed in a cassette for a 24-pin dot printer (VP-2000, manufactured by Epson Corporation), and the cassette was set in the printer.
The # characters were printed continuously in a thermostat at 65 ° C. × 65% RH, and the print density (character density) of every 200 lines was measured with a densitometer PCM-II manufactured by Macbeth. The number of prints up to 0.4 PCS was obtained by a lab graph, and this was defined as the ink life.

The evaluation criteria are as follows.

◎: 1200 lines or more ○: 1100 to 1200 lines Δ: 1000 to 1100 lines ×: 800 to 900 lines <Ink retention> A circular cutter manufactured by Hirano Techseed Co., Ltd. was used as the base material for the ink ribbon of the sample. And diameter 10
Cut to cm and make 3 samples for each sample.
After measuring the weight (A) of the sample, the sample is immersed in a dye-based oil-based ink manufactured by Sakata Inx Co., Ltd., and then defoamed with a vacuum dryer. Further, after removing excess ink with filter paper and paper for all the samples, the sample is sandwiched between papers and passed through a mangle under a pressure of 4.5 kg / cm ² three times. The weight (B) of the sample thus obtained was measured, and the adhesion rate of the ink contained in the base cloth was calculated from the following equation to determine the adhesion rate of each sample.
Calculated from the average value of sheets.

Ink adhesion rate = [(B−A) / A] × 100 Evaluation criteria are as follows: ：: 22% or more ○: 20.1 to 21% Δ: 19.1 to 20% ×: 19 % Or less Examples 1 to 5 Sulfuric acid relative viscosity 2.85, titanium oxide content 0.04
The total fineness is 50 denier to 80 denier (single yarn denier 1.2 to 2.1) for the multi-filament yarn composed of nylon 66 polymer which is wt. The fineness is 30 to 40 denier (single yarn denier 1.2), and the lengthwise woven yarn is 50 / denier.
Each of the multifilament yarns subjected to the entanglement treatment of m was produced.

Without twisting the multifilament yarn,
According to the combinations shown in Table 1, the weaving density is 170 to 210 in the length direction, which is used for the length direction and the width direction.
After preparing a woven fabric having a plain weave structure of 108/130 in the width direction and 108 to 130 / in the width direction, the woven fabric was scoured and finished and set by an ordinary method to prepare a base fabric for an ink ribbon. About these ink ribbon base fabrics,
Ink ribbons were respectively manufactured.

For these ink ribbon base fabrics,
The ink retention, printing life, and durability of the fused portion were measured, and for the ink ribbon, the ink retention, printing life, and durability of the fused portion were measured, and the results are shown in Table 1.

Comparative Examples 1 to 5 Sulfuric acid relative viscosity 2.85, titanium oxide content 0.04
The total fineness is 40 denier to 100 denier (single yarn denier 1.2 to 3.1) for the multifilament yarn composed of nylon 66 polymer which is a weight%, Using a denier of 15 to 70 denier (single yarn denier of 1.2 to 2.1), multifilament yarns in which a woven yarn in the length direction was subjected to a 50-m / m entanglement treatment were produced.

Without twisting the multifilament yarn,
According to the combinations shown in Table 1, the weaving density is 170 to 210 in the length direction, which is used for the length direction and the width direction.
After fabrics having a plain weave structure of 105 to 123 fabrics / in in the width direction were produced, these fabrics were scoured and finished and set by a usual method to produce a base fabric for an ink ribbon.

For these ink ribbon base fabrics,
The ink retention, printing life, and durability of the fused portion were measured, and for the ink ribbon, the ink retention, printing life, and durability of the fused portion were measured, and the results are shown in Table 1.

[0043]

[Table 1] As is clear from Table 1, the yarns in Examples 1 to 5 are the base fabrics or the yarns in the length direction in which the currently used lengthwise yarn and the widthwise yarn have the same total fineness. Compared to those having a large fineness, the base fabric had better ink retention, had a longer printing life, and had a remarkable effect of improving the durability of the fused portion. On the other hand, in Comparative Examples 1 to 5, the ink retention of the base fabric, the printing life, the durability of the fused portion were poor, and the life was short, and thus, they were not practical.

[0044]

According to the present invention, the ink retention of the base fabric is improved.
It is possible to provide an ink ribbon having an excellent print life and an excellent durability of the fused portion and a long ribbon life. Further, according to the present invention, it is possible to provide an ink ribbon suitable for a high-impact high-speed printer, a high-copy printer, and the like, which have a high impact.

Claims (7)

[Claims] In a base fabric for an ink ribbon comprising a polyamide multifilament, a woven yarn constituting the length direction of the base fabric is 1.1 to 3.0 times as thick as a woven yarn constituting a width direction. A base fabric for an ink ribbon, which is constituted. 2. The total fineness of the woven yarn constituting the length direction of the base fabric is 40 to 90 denier, and the total fineness of the woven yarn in the width direction is 30 to 60 denier. The base fabric for an ink ribbon according to claim 1, wherein: 3. The woven yarn in the length direction and the width direction of the base fabric,
The base fabric for an ink ribbon according to claim 1 or 2, wherein the base fabric is made of fibers having a single yarn fineness in a range of 1.2 to 2.1 denier. 4. The woven density in the length direction of said base cloth is 150 to 2
The base fabric for an ink ribbon according to any one of claims 1 to 3, wherein the number is 20 / inch. 5. The weave density in the width direction of the base fabric is 100 to 14
The ink ribbon base fabric according to any one of claims 1 to 4, wherein the number is 0 / inch. 6. An ink ribbon comprising the base fabric for an ink ribbon according to any one of claims 1 to 5. 7. The ink ribbon according to claim 6, wherein the use form of the ink ribbon is a cassette type endless ink ribbon having a welding portion.