JPH082073A - Production of base fabric for ink ribbon - Google Patents

Abstract

PURPOSE:To provide a thin base fabric for an ink ribbon without lowering the durability of a welded part and the durability of the base fabric. CONSTITUTION:In producing a base fabric for an ink ribbon composed of a polyamide multifilament, the boiling water shrinkage factor of the polyamide multifilament used in warp yarn is made lower than that of the polyamide multifilament used in weft yarn by 1% or more.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art In recent years, high-speed and high-impact impact printers have been actively promoted. In order to speed up the printer, the stroke of the head pin of the printer must be reduced, and it is necessary to advance the thinning of the ink ribbon.

On the other hand, ink ribbons used in impact printers have decreased in number from the spool type used in the past, and a long tape-shaped ink ribbon is folded and stored in a cassette, and both ends of the ink ribbon are superposed. The number of cassette-type products that are welded (bonded) with a sonic welder and made endless is increasing, and it is becoming the mainstream. Normally, the ink ribbon is impacted by the head pin of the printer during printing and is gradually destroyed. However, the above-mentioned welded part has less durability than the normal base cloth part, and the life of the welded part is longer than that of the ink ribbon. Since the life of the welded part is affected, there is a strong demand for improving the durability of the welded part. In recent years, it has not been possible to sufficiently meet the demands for ink ribbon thinning, welded portion durability, and base fabric portion durability improvement that accompany rapid printer speed and impact impacts in recent years.

As a method for reducing the thickness of the ink ribbon base cloth, there are methods such as decreasing the denier of the yarns constituting the base cloth. JP-A-60-161184, JP-A-2-231181, and JP-A-2-231181 It is introduced in No. 5-104839.

[0005]

However, in the method of reducing the denier of the yarn to be used, although the thickness of the base cloth is reduced, the basis weight of the base cloth is lowered, the durability of the welded portion as the ink ribbon, and the base cloth are reduced. The deterioration of the cloth durability is unavoidable,
The fact is that it is not applied.

In view of the current state of such ink ribbon base cloth, an object of the present invention is to provide a method for producing a base cloth for an ink ribbon having a thin base cloth without lowering the durability of the welded portion and the base cloth. It is what

[0007]

The present invention employs the following means in order to achieve such an object.

That is, in the method for producing an ink ribbon base fabric of the present invention, in the method for producing an ink ribbon base fabric comprising polyamide multifilaments, the polyamide multifilaments used for the warp boils more than the polyamide multifilaments used for the weft. Water shrinkage rate is 1%
It is characterized by using the lower one.

[0009]

According to the present invention, as a result of extensive studies on a base fabric for providing an ink ribbon having a thin base fabric, excellent durability of a welded portion and durability of the base fabric, a polyamide used for a warp of the base fabric is obtained. Making the boiling water shrinkage of the multifilament lower than the boiling water shrinkage of the polyamide multifilament used for the weft leads to a thin base cloth, and also reduces the welded part durability and the base cloth durability. It is a fact that has never been investigated.

According to the present invention, in the ink ribbon base fabric made of polyamide multifilament, the boiling water shrinkage of the polyamide multifilament used for the warp is
If it is 1% or more, which is lower than the boiling water shrinkage of the polyamide multifilament used for the weft, it is possible to provide an ink ribbon base fabric which is excellent in welded part durability and base fabric durability and has a thin base fabric thickness.

Generally, in the case of a woven fabric, the warp crimp ratio is large and the weft crimp ratio is small on the loom due to the shedding motion of the warp yarn, and the base fabric thickness is large due to this relationship.

Further, when various kinds of post-processing such as liquid scouring, air flow treatment, and high-pressure water flow treatment are carried out for the purpose of increasing the ink absorbency of the ink ribbon base cloth, the base cloth thickness increases. It is normal. As described above, the increase in the thickness of the base cloth not only hinders the speedup of the printer, but also
Conventional printers often cause paper stains and become a problem.

The technique of reducing the thickness of the base fabric of the present invention is not only effective in the production of such a general base fabric for ink ribbons, but also increases the thickness of the base fabric when various kinds of bulky processing are applied. It is also effective in preventing it.

As a method for obtaining a yarn having a low boiling water shrinkage used in the present invention, for example, a method of setting a normal yarn with steam to reduce the shrinkage, a heat treatment in the process of producing a raw yarn to reduce the shrinkage Examples of the method include a method of spinning, a method of spinning at a high speed and a method of producing less distortion, and the like. On the contrary, as a method of obtaining a yarn having a high boiling water shrinkage ratio, a method of using a normal yarn, a method of obtaining a normal yarn without heat treatment as much as possible, a method of using a copolymer, and the like can be mentioned.

The greater the difference in the boiling water shrinkage between the warp and the weft, the lower the thickness of the obtained base fabric, which tends to be preferable. Therefore, the difference in the boiling water shrinkage is 1% or more, preferably 2%. More preferably, it is particularly preferably 3% or more.

In the present invention, polyamide means nylon 6
, Nylon 66, nylon 46 and the like.
Among them, nylon 66 having a sulfuric acid viscosity of 2.8 or more is particularly preferable because the durability of the ink ribbon base fabric is good.

The base fabric constituting the ink ribbon is a woven fabric using the above fibers as warp and weft. Such a polyamide multifilament yarn, as a single fiber,
It is preferably 0.5 to 4 denier, more preferably 0.8 to 3 denier.

The total denier of this yarn is preferably
A multifilament yarn of 5 to 100D, more preferably about 5 to 70D, is preferable because it can provide a well-balanced base fabric thickness, ink absorption and the like. As the fabric density of the base cloth, the warp density is 130 to 3
00 yarns / inch and weft yarn density of 140 to 300 yarns / inch are used, but the weft density is not limited thereto. As the filament yarn for the warp and the weft, one having a twist number of about 0 to 300 T / m is used.

The woven structure of the base cloth is plain weave,
A satin weave, a twill weave, and a modified structure thereof can be used, but are not particularly limited thereto.

The ink ribbon base fabric thus obtained is
A normal oil-based ink, that is, an oil-based ink containing a pigment of 3% or more and a dye of 8% by weight or more and having a viscosity of 6.5 poise (20 ° C.) or more is appropriately adhered to form an ink ribbon.

[0021]

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 Welding Section of Base Fabric] The prepared base fabric for ink ribbon was melt-cut to a width of 13 mm, and then 22% by weight of oil-based ink was applied to the weight of the base fabric and cut to a length of 13 m. Next, an ultrasonic welder (B-Bonson M-
8400), and the welded portions were provided in the ink ribbon at seven positions at approximately regular intervals to prepare an endless ink ribbon.

This ink ribbon is housed in a cassette for a 24-pin dot printer (UP-130K made by Epson), this cassette is set in the printer, alphanumeric characters are printed, and printing when a pinhole is generated in the welded part. The number was read, and the average value was checked against the following standard to determine the durability of the welded part of the base cloth.

[Evaluation Criteria] ◎: 1.11 million characters or more ○: 91 to 1.1 million characters △: 71 to 900,000 characters ×: 700,000 characters or less [Durability of base cloth part] The ink ribbon length is the same as the durability of the welded part. It was cut with scissors to 1 m and then welded by an ultrasonic welder to prepare an endless ink ribbon.

This endless ink ribbon was housed in a cassette for a 24-pin dot printer (UP-130K manufactured by Epson), this cassette was set in the printer, alphanumeric characters were printed, and a pinhole was generated in the base cloth portion. The number of prints at that time was read, the number of prints per 13 m was converted from the average value, and the results were compared with the following criteria to determine the durability of the welded part of the base fabric.

[Evaluation Criteria] ◎: 84 million or more characters ○: 771 to 8.4 million characters ○ to △: 701 to 7.7 million characters △: 631 to 7 million characters △ to ×: 561 to 630 million characters ×: 491 to 5.6 million characters × ×: 490 Ten thousand characters or less Examples 1 to 3, Comparative Example 1 40D-34fil nylon 6 having a relative sulfuric acid viscosity of 2.85
The 6-multifilament was subjected to additional twisting of 280 t / m, and this yarn was used as it was as a warp and a weft, and woven by a plain weave design by a usual method. Furthermore, moist heat 60 ℃
A woven fabric having a plain weave design was similarly woven by using the heat-set yarns for 2 hours and 80 ° C. for 2 hours as warp yarns and the non-heat-set yarns as weft yarns.

The woven fabric shown in Table 1 was prepared by scouring, drying and finishing setting the woven fabric by a conventional method. With respect to the obtained woven fabric, the welded portion durability was measured by the method described above, and the results are shown in Table 1.

[0029]

[Table 1] As is clear from Table 1, in Examples 1 and 2, the thickness of the base cloth was small, and the durability of the welded portion was not deteriorated. Comparative Example 1
The welded part had good durability, but the base cloth had a large thickness.

[0030]

INDUSTRIAL APPLICABILITY The ink ribbon base fabric of the present invention has a thin base fabric thickness and good durability of the base fabric portion and the welded portion, and is suitable for high-speed printers and high-copy printers. Can be provided.

Claims (5)

[Claims] 1. A method for producing a base fabric for an ink ribbon, comprising a polyamide multifilament, wherein the boiling water shrinkage ratio of the polyamide multifilament used for the warp is 1 than that of the polyamide multifilament used for the weft.
A method for producing a base fabric for an ink ribbon, characterized by using a material having a low content of at least 10%. 2. The production of an ink ribbon base fabric according to claim 1, wherein the polyamide multifilament used for the warp has a boiling water shrinkage ratio of 2% or more lower than that of the polyamide multifilament used for the weft. Method. 3. The production of an ink ribbon base fabric according to claim 1, wherein the polyamide multifilament used for the warp has a boiling water shrinkage of 3% or more lower than that of the polyamide multifilament used for the weft. Method. 4. A entanglement place is formed by applying an entanglement treatment to a warp.
The method for producing a base fabric for an ink ribbon according to claim 1, wherein the range is -80 / m. 5. The method for producing a base fabric for an ink ribbon according to claim 1, wherein the twist number of the warp is in the range of 0 to 30 t / m.