JPH0768908A - Base fabric for ink ribbon - Google Patents

Abstract

PURPOSE:To enhance printing sharpness, high spot resistance and ink life, in a base fabric for an ink ribbon obtained by impregnating a tape like article composed of a plain fabric of polyamide multifilament yarn with ink, by setting the voids of the fabric to a specific range. CONSTITUTION:An ink ribbon used in an impact type printer is obtained by applying ink to a narrow tape like ribbon formed by slitting a plain fabric and received in a cassette to be used. In this case, in a base fabric for the ink ribbon obtained by impregnating the tape like article composed of the plain fabric of polyamide multifilament yarn with ink, the voids of the fabric are set to the range of 0.5-8%. When the voids of the fabric become 0.5% or less, an ink sump part is generated in the folded part of the ink ribbon and the density of ink increases to make a high spot easy to generate. When the voids become 8% or more, the initial density of ink is increased to make paper staining apt to generate and ink life also becomes short.

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 used in various impact type printers such as serial dot printers and line dot printers. More specifically, the present invention relates to a base fabric for an ink ribbon having improved high spot property and excellent in printing clarity.

[0002]

2. Description of the Related Art Generally, an ink ribbon used in an impact type printer is used by accommodating an ink coated on a narrow tape ribbon formed by slitting a plain fabric into a predetermined width (cassette type ink). ribbon). At this time, the ink ribbon is filled in the cassette in a finely folded state. The ink ribbon stored in such a state for a long time has an ink pool inside the folded portion.

When such a cassette type ink ribbon is printed by a printer, the folded portion of the ink ribbon is darkly printed, and so-called high spots occur. This is not preferable in terms of appearance because the difference in lightness and darkness of the printing is generated especially in the case of graphic printing. Therefore, as a countermeasure, a technique for improving the ink retaining property and reducing high spots by specifying the crimp angle of the warp of the ink ribbon (Japanese Utility Model Laid-Open No. 2-24961), or a special woven structure of the woven fabric A technique for improving ink absorbency and reducing high spots by using a plain weave structure (induction plain weave structure) (JP-A-3-348).
No. 83) is proposed.

However, such a technique has various problems inherent therein and is not yet a complete solution.
That is, in Japanese Utility Model Laid-Open No. 2-24961, the processing conditions for keeping the crimp angle within the specified range are difficult, and the thickness of the cloth is increased. The opposite direction is unfavorable to the demand, that is, the demand for making the base fabric thin.

Japanese Unexamined Patent Publication (Kokai) No. 3-34883 discloses a plain woven fabric having a special design, and since a floating design is formed by warp and weft, the fixing of constituent yarns becomes unstable, so that it is high to stop it. It is necessary to make the density fabric. Therefore, the thickness of the base cloth becomes large, and the base cloth becomes unfavorable to the demand for the base cloth due to the speeding up of the printer.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide an ink ribbon having a normal plain weave structure and excellent in printing sharpness, particularly in a cassette type ink ribbon, in which high spots are unlikely to occur and the fabric is unlikely to be thick. It is intended to provide a base fabric for an ink ribbon.

[0007]

According to the present invention, a tape-like material made of a plain woven fabric of polyamide multifilament yarn is impregnated with ink, and the fabric has a porosity of 0. A base fabric for an ink ribbon, which is in the range of 5% to 8%.

In the present invention, the polyamide multifilament yarn is preferably nylon 66 fiber or nylon 6 fiber, and particularly preferably nylon 66 fiber in terms of abrasion resistance and impact resistance. The denier of the polyamide multifilament yarn is preferably 10 denier to 100 denier, more preferably 20 denier to 50 denier. The monofilament denier of these polyamide filament yarns is preferably 0.5 denier to 3.0 denier. These polyamide filament yarns may be twisted or untwisted, but in the case of twisted, the twist number is usually preferably 300 T / m or less.

The ink ribbon base fabric made of such polyamide filament yarn preferably has a plain weave design in which normal warp yarns and weft yarns are alternately crossed one by one, and its density varies depending on the denier of the yarn to be used. 12
It is preferably 0 yarns / in to 250 yarns / in and weft yarns 90 yarns / in to 160 yarns / in, and they may be single woven fabrics or tubular weaves.

What is important in the present invention is that the porosity of the plain woven fabric is in the range of 0.5% to 8%. The term "woven fabric porosity" as used herein means measuring the void area that can be determined when light is applied from the bottom to a fabric having a predetermined area,
It is calculated by the formula of (measured void area) / (woven fabric area) × 100. The void area by the light transmission method can be measured by a transmission light method surface photograph by an optical microscope or image analysis.

When the woven fabric porosity is less than 0.5%, the woven density becomes high and when a predetermined amount of ink is applied, the ink is present in a large amount in the depressions at the intersections of the warp threads and the weft threads or on the surface thereof. Therefore, if the ink ribbon is folded and filled in the cassette and stored for a long period of time, the ink is squeezed out to the inside of the folded portion and an ink pool occurs. When printing is performed in this state, a phenomenon in which the print density in the ink reservoir increases, that is, a high spot is likely to occur. Therefore, the woven fabric porosity needs to be 0.5% or more.

However, when the woven fabric porosity is more than 8%, the weaving density becomes coarse, and a large amount of ink is present in an unstable state in the weave portion at the intersection of the warp and the weft. As a result, the initial print density is high, and paper stains and the like are likely to occur, which is not preferable and the ink life is shortened. The ink ribbon base fabric of the present invention has a fabric porosity of 0.5.
% To 8%, preferably 1% to 6%. An ink ribbon having a porosity in this range has good printing clarity, makes it difficult for high spots to occur, and improves ink life.

The woven fabric porosity of the ink ribbon base fabric of the present invention can be obtained by adjusting the design of the greige, the overfeed ratio in the longitudinal direction during the scouring set, the tentering ratio in the lateral direction, and the like. ,

[0014]

EXAMPLES The present invention will be described in detail below with reference to examples. The physical properties were measured as follows. (1) High-spot property After filling a cassette with an ink ribbon with a width of 16 mm and leaving it for 7 days, a dot printer (manufactured by Fujitsu Limited, trade name FA
COM9450) to print a black solid pattern, and visually determine the print density of the first page.

◯: The print density is almost constant over the whole Δ: High density print spots (number) are slightly conspicuous ×: High density print spots (number) are very noticeable (2) Ink life 25 mm width ink ribbon 5 m ( 2 for seamless ribbon
m) in the cassette, print the ANK type on a dot printer (trade name KD36 manufactured by Hitachi Koki Co., Ltd.), and
The number of printed pages when the CS (print contrast signal) value is 60 is measured. (3) Woven fabric porosity Light is applied to the ink ribbon base fabric from the bottom, and transmitted light is photographed with an optical microscope (magnification: 20) to calculate the ratio of the transmitted light area (void area) to the base fabric area.

[0016]

Examples 1 to 3, Comparative Example 1 Nylon 66 fiber 40d / 34f (twisted: 250T / m) as warp, nylon 66 fiber 40d / 34f (untwisted) as weft, warp density 200 / in, weft A plain fabric having a density of 118 fibers / in was scoured, and four kinds of ink ribbon base fabrics were obtained by adjusting the conditions of the set. This is slit into 16 mm width and 25 mm width and inked (ink: manufactured by Sakata Inx Co., Ltd., trade name CBK01, ink application amount 20% ow
Then, the ink ribbon was obtained. The ink ribbon was joined with an ultrasonic welder to form an endless ink ribbon, and the cassette was filled. High spot property and ink life were measured. The results are shown in Table 1 below.

[0017]

[Table 1]

[0018]

Example 4 Nylon 66 fiber 42d / 24 as warp
Nylon 66 fiber 42d / 24f as f (untwisted) weft
(Untwisted) warp density 195 / in, weft density 1
Relaxing and scouring a 12-in / in plain weave machine and setting it in a tentering mode, the warp density is 200 in /, and the weft density is 112.
A book / in ink ribbon base fabric was obtained.

The fabric porosity of this ink ribbon base fabric is 3.
5% and the thickness was 115 μm. Example 1 except that the ink application amount of this ink ribbon base cloth was 23% owf
As in the case of Nos. 3 to 3, slitting, inking, joining, endless, and filling into a cassette, a cassette type ink ribbon was obtained. High spots of the obtained cassette type ink ribbon are unlikely to occur, and the ink life is 16
The ink ribbon on page 0 was very good.

[0020]

[Example 5 and Comparative Example 2] Nylon 66 fiber 5 as warp
0d / 34f (untwisted), nylon 66 fiber 5 as weft
A cassette type ink ribbon was prepared in the same manner as in Examples 1 to 3 except that 0d / 34f (untwisted) was used and a seamless ribbon (circumference 2.0 m) made of tubular weave (flat structure) was used. High spot property and ink life are as shown in Table 2.

[0021]

[Table 2]

[0022]

INDUSTRIAL APPLICABILITY The ink ribbon base fabric of the present invention is excellent in printing sharpness, extremely excellent in high spot resistance, and has a significantly long ink life even when used after being stored in a cassette for a long period of time. An improved ink ribbon is obtained. In addition, it is not necessary to use a woven fabric with a special structure like a conventional ink ribbon, a simple plain weave structure is sufficient, and there is no need to increase the crimp angle to improve a high spot as in the conventional case, and the thickness of the obtained ink ribbon can be increased. Hardly improves.

Therefore, as in recent years, there is a demand for the thickness of the ink ribbon base fabric as the printer speed increases,
That is, it is possible to obtain an ink ribbon which is a thin ink ribbon base fabric and which can be used extremely preferably even in the case where the ink life is long.

Claims (1)

[Claims] 1. A base fabric for an ink ribbon, wherein a tape-shaped material made of a plain woven fabric of polyamide multifilament yarn is impregnated with ink, wherein the woven fabric porosity is in the range of 0.5% to 8%. Base fabric for ribbons.