JP3521638B2 - Base fabric for ink ribbon and 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 cloth excellent in durability of a fused portion of an ink ribbon used in an impact type printer.

[0002]

2. Description of the Related Art Recently, ink ribbons used in impact type printers have decreased in conventional spool type, and long tape-shaped ink ribbons are folded and stored in a cassette, and both ends of the ink ribbons are ultrasonically welded. There is an increasing number of cassette-type cassettes that have an endless fused portion that is fused (bonded). Normal,
When printing, the ink ribbon is impacted by the head pin of the printer and gradually destroyed, but the above-mentioned fused part is less durable than the normal base cloth part, and the life of the fused part is longer than that of the ink ribbon. There is a strong demand for improving the durability of the fused portion of the ink ribbon because the life of the ink ribbon is affected. As described above, it has been earnestly desired to improve the durability of the ink ribbon fusion portion due to the recent rapid increase in speed and impact of the printer.

As a means for improving the durability of the fused portion, a technique of inserting a thermoplastic synthetic resin having a melting point lower than that of the base cloth between the two ink ribbons to be fused and fusing is known.
No. 13431 is proposed.

[0004]

However, since the ink ribbon to be fused is impregnated with ink, the fusion between the polymers having different melting points is insufficient and the durability of the fused portion is not improved. There was a problem that it was not sufficient and the workability at the time of fusion bonding was poor. Further, with the increase in speed and impact of printers, high durability of the ink ribbon fusion portion has been demanded, but it is the current situation that these requirements are not satisfied.

The present invention is intended to provide an ink ribbon having excellent durability of the fused portion.

[0006]

The present invention adopts the following means in order to solve the above problems. That is, the base fabric for an ink ribbon of the present invention is a weft constituting the base fabric.
The yarn is characterized by being made of a polymer having a lower melting point than that of the warp .

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a base fabric for an ink ribbon is composed of a woven yarn having a melting point difference between a warp yarn and a weft yarn ,
In other words, the weft yarns that make up the base cloth are lower than the melting point of the warp yarns.
It is characterized by the fact that it is composed of a polymer . That is, the low-melting side of the weft mainly fused, by leaving the high melting point side of the warp mainly in fiber form <br/>, base fabric to form a fused portion in which a mix of fibers and fused portion However, it was surprisingly clarified that the durability of the fused portion is significantly improved. Constructing the base fabric of the present invention
The weaving yarn to be used is polyamide fiber, polyester fiber,
Polyacrylic fibers, polyvinyl fibers, etc. may be mentioned, and as the polyamide fibers, nylon 46, nylon 66, nylon 6, nylon 610, nylon 1 are used.
First grade. From this fiber, but the fiber used for the warp and weft so that it can impart a melting point difference is selected, it is important that low melting point of the weft yarn than the melting point of the <br/> warp
The melting point difference is preferably 5 ° C. or more. In particular, a base fabric in which the warp yarn is nylon 66 and the weft yarn is nylon 6 is preferable in terms of cost and durability of the fused portion.
The relative viscosity of sulfuric acid of the polymer constituting the warp or weft is
It is preferably 2.4 to 3.8 from the viewpoint of the durability of the fused portion, and the content of titanium oxide contained in the yarn is preferably 0.1% or less, but is particularly limited to this. is not. The total fineness of such yarn is generally 5 to 150
You can use denier. Further, the single yarn fineness that constitutes such a yarn is preferably 0.6 to 4.0 denier, which is generally used, for constituting the base fabric. Single yarn denier is 0.6
When it is less than denier, the durability of the base fabric portion tends to decrease, and when the single yarn denier exceeds 4.0 denier, the printing sharpness tends to deteriorate. Both warp and weft may be untwisted, but preferably 150-70.
From the viewpoint of weavability, it is better to carry out additional twisting in the range of 0 T / m, and more preferably in the range of 200 to 600 T / m. The fabric structure of the ink ribbon base fabric includes plain weave, induction plain weave,
Twill weave, satin weave, and the like are used, but not limited thereto. The fabric density of such a fabric may be such that the warp is preferably 130 to 600 yarns / in, more preferably 140 to 550 yarns / in, and the weft yarn is preferably 1
00-400 lines / in, more preferably 110-350
Books / in is enough. The ink ribbon base fabric thus obtained is woven and then subjected to usual scouring and finishing set. Preferably, it is scoured by liquid scouring and then 1 with a pin tenter.
It is good to finish-set in the range of 60 ° C to 240 ° C.
Then, an appropriate amount of an ink material such as an oil-based ink is attached (impregnated) to the base cloth, and then fused to form an endless ink ribbon. Such fusing is performed by using ultrasonic welders on both ends of the ink ribbon base fabric.
The base fabric for an ink ribbon of the present invention may be subjected to a suitable post-treatment such as high-pressure liquid treatment, plasma treatment, surfactant treatment, and resin treatment. The ink ribbon formed by using the thus-obtained ink ribbon base fabric of the present invention has excellent durability of the fused portion of the base fabric and also has excellent durability of the base fabric portion.

[0008]

EXAMPLES The present invention will be described in detail below with reference to examples. The evaluation method used in the present invention is as follows. [Durability of fused part of base cloth] The prepared base cloth for ink ribbon is melt-cut to a width of 13 mm and once cut to a total length of 13 m with scissors, and then the base ink is applied with an oil-based ink to a weight of % By weight, and then fused by an ultrasonic welder (M-8400 manufactured by Branson Co., Ltd.). Seven fused portions were provided in the ink ribbon at substantially equal intervals to produce an endless ink ribbon. did.

The ink ribbon is housed in a cassette for a 24-pin dot printer (UP-130K manufactured by Epson), the cassette is set in the printer, and alphabets,
And numbers were printed, the number of prints when a pinhole was generated in the fused portion was read, and the average value was used as the durability of the fused portion of the base fabric.

◎: 1.11 million or more characters ○: 91 to 1.1 million characters Δ: 71 to 900,000 characters ×: 700,000 characters or less Example 1 Sulfuric acid relative viscosity 2.85, titanium oxide content 0.04 w
t%, made of nylon 66 polymer with a melting point of 255 ° C. 4
Using 0 denier 34 filament yarn as warp, sulfuric acid relative viscosity 2.80, titanium oxide content 0.04 wt%, melting point 2
40 denier made of nylon 6 polymer at 15 ° C 34
Using a filament yarn as the weft, a woven fabric having a flat design with a warp density of 210 threads / inch and a weft density of 122 threads / inch was obtained.
Next, scouring and finishing setting were carried out by a usual method to prepare a base fabric for an ink ribbon.

[0011]

Example 2 Sulfuric acid relative viscosity 2.85, titanium oxide content 0.04w
t%, made of nylon 66 polymer with a melting point of 255 ° C. 4
Using 0 denier 34 filament yarn as warp, sulfuric acid relative viscosity 2.80, titanium oxide content 0.04 wt%, melting point 1
Copolymer of nylon 66 and nylon 6 at 90 ° C (copolymerization ratio of nylon 66 and nylon 6 = 15% by weight /
40 denier 34 filament yarn composed of 85% by weight) is used as the weft, and the warp density is 210 yarns / inch, the weft density is 1
A woven fabric having a flat design of 22 fibers / inch was obtained. Next, scouring and finishing setting were carried out by a usual method to prepare a base fabric for an ink ribbon.

Comparative Example 1 Sulfuric acid relative viscosity 2.85, titanium oxide content 0.04w
t%, made of nylon 66 polymer with a melting point of 255 ° C. 4
A 0 denier 34 filament yarn was used for the warp and the weft to obtain a woven fabric having a flat design with a warp density of 210 yarns / inch and a weft yarn density of 122 yarns / inch. Next, scouring and finishing setting were carried out by a usual method to prepare a base fabric for an ink ribbon.

Comparative Example 2 Sulfuric acid relative viscosity 2.80, titanium oxide content 0.04w
40% made of nylon 6 polymer with a melting point of 215 ° C.
Using denier 34 filament yarn for warp and weft,
A plain weave fabric having a warp density of 210 yarns / inch and a weft yarn density of 122 yarns / inch was obtained. Then, by the usual method, scouring,
After finishing setting, an ink ribbon base fabric was prepared.

For these ink ribbon base fabrics, ink ribbons were prepared based on the test method for the fused portion durability of the base fabric, and the durability of the fused portion of each of the base fabrics was measured. Is shown in Table 1.

[0016]

[Table 1] As is clear from Table 1, those of Examples 1 and 2 have good durability of the fused portion of the base cloth, that is, those having a higher melting point of the warp than the melting point of the weft show good results. It was

On the other hand, in Comparative Examples 1 and 2,
The fused part of the base cloth had poor durability and was not practical.

[0018]

According to the present invention, it is possible to provide an ink ribbon suitable for high-speed printers, high-copy printers, etc., in which the fused portion of the base cloth has good durability and which has a strong impact.

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Claims (4)

(57) [Claims] 1. The weft yarns constituting the base fabric are higher than the melting point of the warp yarns.
A base fabric for an ink ribbon, which is made of a low polymer. 2. The base fabric for an ink ribbon according to claim 1, wherein the difference in melting point of the polymer is 5 ° C. or higher. 3. The warp comprises nylon 66,
Ink ribbon base fabric according to claim 1 or 2 wefts is characterized by being composed of nylon 6. 4. An ink ribbon comprising the base fabric for an ink ribbon according to any one of claims 1 to 3 .