JPH0924663A - Ink ribbon base cloth and ink ribbon - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foundation cloth for an ink ribbon which is improved effectively in graphic spots easily and cheaply. SOLUTION: A foundation cloth for an ink ribbon is composed of alternatingly twisted yarns of at least either of warp and welt which compose the foundation cloth, and an ink ribbon is made of such foundation cloth.

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 graphic unevenness of an ink ribbon used in an impact type printer, and an ink ribbon formed of the base cloth.

[0002]

2. Description of the Related Art Recently, in the ink ribbons used in impact type printers, the conventional spool type has decreased and the cassette type has rapidly increased. This cassette type ink ribbon is folded and stored in a cassette in a narrow space. When you print this cassette type ink ribbon on a printer,
There is a defect that printing unevenness called a graphic unevenness in which the bent portion is densely printed is generated. In recent years, with the advent of printers such as laser printers, thermal transfer printers, and ink jet printers that use a new printing method that does not generate graphic spots, the demand for ink ribbon base fabrics that do not produce graphic spots is increasing. . As a means for reducing the graphic unevenness, a technique of additional twist of 200 to 400 T / m is generally known. Alternatively, you can
A technique for specifying the density ratio between the warp and the weft after setting is proposed by Japanese Patent Laid-Open No. 1-249484. In addition, the number of twists per 1 m is (2
A technique of using bulky yarn that has been untwisted with the same number of twists without heat treatment after adding a strong twist equal to or more than 0000 / original yarn denier square root) is disclosed in Japanese Examined Patent Publication No. 53-23725 and high pressure fluid treatment. Japanese Patent Application Laid-Open No. 3-281277 proposes a technique for disturbing the arrangement of single fibers. In addition, a technique for improving the printing sharpness without ink stains by using a false twist textured yarn with a twist coefficient of 29 × 10 ³ or more and a heater temperature specified for a weft,
It is proposed in Japanese Examined Patent Publication No. 3-51592.

[0003]

[Problems to be Solved by the Problem] However, the commonly used technique of additional twisting of 200 to 400 T / m is
Although the effect of reducing graphic unevenness is great, there is a problem in terms of cost because the twisted yarn is expensive. Further, the technique of specifying the density ratio of the warp and the weft has not only a small effect of reducing the graphic unevenness, but also has a problem in terms of quality such as wrinkles because it controls the shrinkage ratio by processing. Further, the technique according to Japanese Patent Publication No. 53-23725 is characterized in that graphic unevenness is reduced and the strength of the yarn is less deteriorated. However, since the number of twists per 1 m is (20,000 / original yarn denier square root) or more, a strong twist is added , Had the drawback of being very expensive. On the other hand, the high-pressure fluid treatment, which is a technique for reducing the graphic unevenness from the processed surface, has a great effect of reducing the graphic unevenness, but has not been advantageous in terms of cost. Further, the use of the false twist textured yarn as the weft is excellent as a technique for preventing ink stains and improving the printing sharpness, but the effect of reducing graphic unevenness is small.

An object of the present invention is to provide an ink ribbon having a great effect of improving graphic spots by an inexpensive technique.

[0005]

The present invention employs the following means to achieve the above object. That is, the base fabric for an ink ribbon of the present invention is characterized in that at least one of the warp yarn and the weft yarn constituting the base fabric is an alternate twist false twist textured yarn. Further, the ink ribbon of the present invention is characterized by being constituted by such a base cloth.

[0006]

According to the present invention, it is possible to provide an ink ribbon for a cassette type which is inexpensive and has a large improvement effect without generating graphic unevenness. As a result of intensive studies, the alternate twisted false twisted yarn was adopted as a woven yarn. Surprisingly, it has been clarified that an ink ribbon having a great improvement effect in which graphic spots do not occur can be provided easily and inexpensively without employing a complicated technique such as a conventional technique.

The woven yarn material constituting the base fabric in the present invention is mainly composed of synthetic fibers, and it is particularly preferable to use a polyamide polymer material, but it is not limited to this. As such a polyamide-based polymer, nylon 46, nylon 66, nylon 6, nylon 610, nylon 11 and a polyamide copolymer obtained by copolymerizing these with a copolymerization component can be used.

Further, the sulfuric acid relative viscosity of the polymer constituting the warp or weft is preferably 2.4 to 3.8 from the viewpoint of the durability of the fused portion, and the titanium oxide contained in the yarn is contained. The rate is preferably 0.15% or less, but is not particularly limited to this.

The total denier of the warp or weft is preferably 5 to 150 denier, which is generally used, and more preferably 20 to 100 denier.
Single yarn denier is generally used in the range of 0.6-5.
The range of 0 denier is preferable for forming the thin base fabric. When the single yarn denier is less than 0.6 denier, the durability of the base fabric portion tends to decrease, and when the single yarn denier exceeds 5.0 denier, the printing sharpness tends to deteriorate. As the woven structure of the base fabric for such an ink ribbon,
Plain weave, induction plain weave, twill weave, satin weave and the like are used, but not limited thereto.

The woven fabric density of such a woven fabric is preferably 100 to 300 warp yarns / in, more preferably 140 to 300 yarns / in.
250 yarns / in may be used, and the weft yarn is preferably 80 to 300.
The line / in, and more preferably about 100 to 250 line / in.

The base fabric used in the present invention preferably has a cover factor represented by the following formula of 1700 or more. That is, cover factor (K) = (warp yarn fineness) ^1/2 × warp yarn density + (weft yarn fineness) ^1/2 × weft yarn density The generation mechanism of the graphic unevenness is that the ink ribbon is folded and stored in the cassette and folded. When the multifilaments of the warp inside the ink ribbon are scattered, new voids are created.Therefore, when the ink near the voids moves to the voids and prints on the printer, this bend It is considered that this is a phenomenon in which a portion is printed darkly. As a method for improving this graphic spot, 200-40 which is usually used
In the additional twisting method of 0 T / m, since the multifilament of the warp inside the bent ink ribbon suppresses the loosening due to the additional twist, it is considered to be an improvement effect by suppressing the generation of new voids. . The problem with this method is that the processing speed is slow and the processing cost is too expensive.

On the other hand, the alternately twisted and false twisted textured yarn of the present invention is one in which S twist and Z twist are alternately applied in the length direction of one yarn, and twist is imparted similarly to the additional twist. Although it improves the graphic unevenness, it has the advantages of excellent processing speed and significantly low processing cost. The number of twists in the S-twisted and Z-twisted yarns of the alternate twist false twisted yarn is preferably 100 to 400 T / m, and more preferably 200 to 400 T / m. Moreover, the length of the twisted yarn portion of S twist and Z twist is not particularly limited, but is 1 to 100c.
m is preferable. Further, even if there is a non-twisted portion between the S-twisted and Z-twisted yarn portions, the present invention is not limited thereto.

As a method for obtaining such an alternate twist false twisted textured yarn, a method of continuously injecting air using a revolving nozzle, a method of intermittently changing the air injecting direction at regular intervals, A method in which different swirling nozzles are arranged in series and the jetting time of each nozzle is changed intermittently can be adopted, and if necessary, after the swirling nozzle processing, heat treatment is performed to more firmly fix the applied twist. You can also do it. The processing conditions for obtaining the alternately twisted and false twisted textured yarn using the swirling nozzle can be appropriately selected depending on the intended alternate twisted and false twisted textured yarn, but as usual processing conditions, the air pressure is 5 kg / cm ² and the feed rate is +5. %, Processing speed 20
0 m / min, false twist temperature is room temperature or 120-220 ° C
Then, it is possible to adopt a condition in which the air jetting direction and the jetting time are intermittently changed every 0.1 to 0.5 seconds.
When the injection direction is intermittently switched, it is preferable to switch it in the shortest possible time from the viewpoint of shortening the untwisted portion. The thus obtained alternate twisted false twisted textured yarn is used for at least one yarn of the warp yarn and the weft yarn constituting the base fabric for the ink ribbon of the present invention. It is preferable to use 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 it is 160 ° C to 24 with a pin tenter.
It is recommended to finish-set in the range of 0 ° C. Then, an appropriate amount of an ink material such as an ordinary oil-based ink is attached (impregnated) to the base cloth, and then fused to form an endless ink ribbon. Such fusing is performed using an ultrasonic welder at both ends of the ink ribbon base fabric. The ink ribbon formed using the thus-obtained ink ribbon base fabric of the present invention is excellent in eliminating graphic unevenness.

[0014]

The present invention will be described below in detail with reference to examples. The evaluation method used in the present invention is as follows. [Graphic spots] 1 prepared ink ribbon base fabric
Fused to a width of 3 mm, once cut with scissors to a total length of 13 m, and then these base cloths were coated with oil-based ink to
% By weight and then fused by an ultrasonic welder (M-8400 manufactured by Branson Co., Ltd.), and seven fused portions were provided in the ink ribbon at substantially equal intervals to produce an endless ink ribbon. . Next, the ink ribbon (10 m in length) is stored in a cassette for a 9-pin dot printer (M-1550 manufactured by Tokyo Electric Co., Ltd.), the cassette is set in the printer and solid printing is performed, and the generation state of graphics is visually evaluated. did. The evaluation criteria are as follows.

⊚: No spots are generated at all ○: Little spots are formed Δ: Thin spots are generated ×: Thick spots are formed × ×: Very spots are generated Examples 1 to 4 Sulfuric acid relative viscosity is 2 Nylon 66 polymer of 0.85 and titanium oxide content of 0.03% 40 denier 3
A 4-filament multifilament yarn was produced. Next, the air pressure was 5 kg / cm ² , the feed rate was + 5%, the processing speed was 200 m / min, the false twisting temperature was 220 ° C., and the intermittently changing air injection time was changed, and the alternate twisting false twisting process shown in Table 1 was performed. I got a thread. Next, the alternate twist false-twist textured yarn is used for only the warp and for both the warp and the weft, and the weaving density is 170 warps / in, 113 wefts / in, and 210 warps.
A woven fabric having a flat design of book / in and weft of 123 / in was obtained. Next, these woven fabrics were subjected to scouring and finish setting by a usual method to produce the ink ribbon base fabric shown in Table 1. With respect to these ink ribbon base fabrics, ink ribbons were prepared based on the test method for graphic unevenness in the previous period, and the respective graphic unevennesses were measured, and the results are shown in Table 1.

Comparative Example 1 A nylon 66 polymer having a relative sulfuric acid viscosity of 2.85 was used, and 40 denier 3 having a titanium oxide content of 0.03%.
A 4-filament multifilament yarn was produced. Then, using a double twister, processing speed 30m / min
Yarn of 280 T / m was used as the warp yarn, and yarn without additional twist was used as the weft yarn, and the weaving density was 210 warps / in, weft 12
A woven fabric having a flat design of 3 fibers / in was obtained. Next, the woven fabric was subjected to scouring and finish setting according to a usual method to prepare an ink ribbon base fabric shown in Table 1. After that, an ink ribbon was prepared based on the test method of the graphic unevenness in the previous period, and each graphic unevenness was measured, and the results are shown in Table 1.

COMPARATIVE EXAMPLE 2 A nylon 66 polymer having a sulfuric acid relative viscosity of 2.85 and a titanium oxide content of 0.03% and 40 denier 3 were used.
A 4-filament multifilament yarn was produced. Then, using a spindle type false twisting machine, the number of false twists is 450
0T / m, heater temperature 220 ℃, processing speed 200m / mi
A false twist textured yarn was obtained at n. The false twist textured yarn was used for both warp and weft to obtain a woven fabric having a plain design with warp density of 210 warps / in and weft 123 warps / in. Next, the woven fabric was subjected to scouring and finish setting according to a usual method to prepare an ink ribbon base fabric shown in Table 1. After that, an ink ribbon was prepared based on the test method of the graphic unevenness in the previous period, and each graphic unevenness was measured, and the results are shown in Table 1.

COMPARATIVE EXAMPLE 3 A nylon 66 polymer having a sulfuric acid relative viscosity of 2.85 and a titanium oxide content of 0.03% of 40 denier 3 was used.
A 4-filament multifilament yarn was produced. Then, the yarn is used for both warp and weft, and the weaving density is 21
A woven fabric having a flat design of 0 yarns / in and weft 123 yarns / in was obtained. Next, the woven fabric was subjected to scouring and finish setting according to a usual method to prepare an ink ribbon base fabric shown in Table 1. After that, an ink ribbon was prepared based on the test method of the graphic unevenness in the previous period, and each graphic unevenness was measured, and the results are shown in Table 1.

[0019]

[Table 1] As is clear from Table 1, the images of Examples 1 to 4 had good graphic spots. On the other hand, in Comparative Example 1, although the graphic unevenness was good, the processing speed of the additional twist was slow and the cost was high. In Comparative Example 2, the effect of improving the graphic unevenness was small.

[0020]

According to the present invention, it is possible to provide an ink ribbon base cloth for a cassette type which is inexpensive and has a great effect of improving graphic unevenness and which is preferable for increasing the speed and impact of the printer.

Claims (9)

[Claims] 1. A base fabric for an ink ribbon, wherein at least one of a warp yarn and a weft yarn constituting the base fabric is an alternate twist false twisted yarn. 2. The ink ribbon base fabric according to claim 1, wherein the twist number of the twisted portion of the alternate twist false twisted yarn is 100 to 400 T / m. 3. The base fabric for an ink ribbon according to claim 1, wherein the material forming the base fabric is polyamide fiber. 4. The warp and weft cover factors are:
The base fabric for an ink ribbon according to claim 1, wherein the base fabric is 1700 or more. 5. The ink ribbon base fabric according to claim 3, wherein the polymer forming the warp or the weft has a relative sulfuric acid viscosity of 2.4 to 3.8. 6. The ink ribbon base fabric according to claim 1, wherein the content of titanium oxide contained in the warp or the weft is 0.15% or less. 7. The ink ribbon base fabric according to claim 1, wherein the warp or weft has a total denier of 20 to 100 denier. 8. The warp or weft yarn is a single yarn denier 0.6.
The base fabric for an ink ribbon according to claim 1, wherein the base fabric is composed of fibers in the range of 5.0 to 5.0 denier. 9. An ink ribbon comprising the base fabric for an ink ribbon according to claim 1.