JPH08332763A - Base fabric for ink ribbon - Google Patents

Abstract

PURPOSE: To obtain a base fabric for an ink ribbon excellent in printing capacity such as ink absorbability, high spot properties, ink life or printing sharpness and also excellent in the durability of a bonded part and a base fabric part. CONSTITUTION: A base fabric for an ink ribbon is composed of a polyamide fiber with sulfuric acid relative viscosity ηγ of 2.5-3.2 and fineness of 20-100 denier and the ratio of the weaving density of the weft yarns constituting the lateral direction of the base fabric to that of the warp yarns constituting the longitudinal direction thereof is 0.35-0.55 and the weaving density of warp yarns is 150-260/tow.

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 fabric made of polyamide multifilament yarn. More specifically, the present invention relates to an ink ribbon base fabric having improved ink absorbency, printing performance, and durability of a joint portion and a base fabric portion.

[0002]

2. Description of the Related Art In recent years, with the widespread use of computers in various fields, the printing system of the end device has been dramatically developed. As a printing method in such a printing system, an ink jet method, a thermal transfer method, a heat-sensitive method and the like are representative, and in these systems, non-impact and high printing speed are being promoted. On the other hand, impact dot printing methods using cloth ribbons include impact dot type printers, serial dot type printers, etc., but at present in Japan, the printer market using the cloth ribbon type is decreasing. It is considered that this is because the cloth ribbon type printer is slightly inferior to the non-impact type in problems such as clear printing and high spot phenomenon. The high spot phenomenon here means that the ink ribbon is stored in a cassette in a folded state for a long period of time, ink is collected at the folds of the ink ribbon, and uneven printing occurs in the initial printing.

In order to solve such problems, attempts have been made to improve the cloth ink ribbon. For example, the actual Kaihei 2-24
Japanese Patent Laid-Open No. 961 proposes a method of specifying the crimp angle of the warp yarn of the ink ribbon as a technique for improving the ink absorbency and reducing the high spot phenomenon. Further, Japanese Patent Laid-Open No. 3-34883 proposes a technique for changing the woven structure of a woven fabric to a special plain woven structure (guide plain woven structure).

However, the technique proposed in this way has various unsolved problems and has not yet reached a satisfactory solution. That is, according to the proposal of Japanese Utility Model Laid-Open No. 2-24961, it is not easy to set and maintain the processing conditions for keeping the crimp angle within the specified range, and the thickness of the obtained fabric is increased. This is contrary to the requirement for the thickness of the fabric, that is, the thinning of the base fabric, which is not preferable. Furthermore, it is not possible to deal with a wide variety of ink types simply by defining the crimp angle, and especially when impregnated with low viscosity ink,
Alternatively, the printing performance was still unsatisfactory when impregnated with a dye-based ink.

Further, Japanese Patent Laid-Open No. 3-34883 proposes a plain weave having a special design. According to this proposal, the warp and the weft form a floating structure, so that the fixing of the constituent yarns becomes unstable. , It is necessary to make high-density fabric to deal with it. Therefore, the thickness of the base fabric is unavoidably increased, and there is a possibility that the base fabric may be unfavorable to the demand for the thin base fabric due to the increase in speed of the printer. Furthermore, there is a drawback in that the weft is significantly damaged and the printing durability of the base fabric is poor.

[0006] On the other hand, as a proposal to eliminate the catch and high spot phenomenon at the time of printing, it has been proposed to make the weft density high and the warp density low in the double woven seamless ribbon. According to Japanese Patent Application Laid-Open No. 5-301432, which proposes this, the wefts are arranged in the length direction of the ink ribbon. However, in the plain weave design which is usually used as the ink ribbon, the weft density is set as in this proposal. It is extremely difficult to increase the density because of the limitation of weaving. The denier of the normally used yarn is 30 to 70 d, but with such a yarn, the density range of the conventional plain weave ink ribbon base fabric in the length direction becomes narrow, and satin weave, plain weave, etc. It is a well-known fact that we have no choice but to become an organization.

Further, increasing the weft density as in this proposal naturally increases the thickness of the base cloth and reduces the voids in the base cloth structure that absorb ink. After all, there is a strong possibility that printing performance and durability will be adversely affected. Although it is a more general finding, it is known that when the weaving density is lowered, the durability of the ink ribbon base cloth joint portion and the durability of the base cloth portion become inferior. There is also concern about having problems based on.

As is apparent from the above, the conventional ink ribbon base cloth has various unsolved problems as described above, and the above-mentioned proposals have been made for them. In other words, a fully satisfactory ink ribbon base fabric cannot be found.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, that is, the ink ribbon base fabric, that is, ink absorbency, high spot property, ink life, and print sharpness. An object of the present invention is to propose an ink ribbon base fabric which is excellent in printing performance and is also excellent in durability of the joint portion and the base fabric portion.

[0010]

The inventors of the present invention have conducted extensive studies to achieve the above object, and as a result, have found that there is an ink ribbon base cloth having a structure capable of achieving the object of the present invention. Heading The present invention has been completed. That is, the present invention is a base fabric for an ink ribbon, which comprises polyamide fibers having a sulfuric acid relative viscosity ηγ of 2.5 or more and 3.2 or less and a fineness of 20 to 100 denier, and has a length direction of the base fabric. A weave density ratio of the weft yarns constituting the width direction to the weave density of the warp yarn is 0.35 to 0.55, and the warp weave density is 150 to 260 yarns / inch, Is.

The present invention will be described in more detail below. In the present invention, the relative viscosity of sulfuric acid (ηγ) of the polyamide multifilament constituting the base cloth is ηγ2.5.
It must be above 3.2. In particular, ηγ 2.8 or more is more preferable in terms of printing durability of the base cloth and durability of the joint portion. The sulfuric acid relative viscosity ηγ here is
It is the relative viscosity of a solution adjusted to have a polymer concentration of 1.0% in a 25. 5% 95.5% concentration sulfuric acid solution.

The total denier of the polyamide multifilament yarn used in the present invention is preferably 20 to 200 denier, more preferably 30 to 50.
Denier. The single yarn denier of these polyamide multifilament yarns is preferably 0.5 to 3.0 denier. These polyamide multifilament yarns may be twisted or untwisted, but in the case of twisted, the twist number is preferably 300 T / M or less.

The base fabric for an ink ribbon made of such polyamide multifilament yarn preferably has a plain weave design in which normal warp yarns and weft yarns are alternately crossed one by one. Furthermore, in the present invention, the polyamide multifilament yarns having the same relative viscosity of sulfuric acid may be used for the warp and the weft, or the polyamide multifilament yarns having different relative viscosities may be used for the warp and the weft.

What is important in the present invention is that the weave density of the warp is 150 to 260 yarns / inch, and the weft density is the warp weave density, although the texture structure of the plain weave varies depending on the denier of the yarn used. 0.35 to 0.55
The organizational structure should be within the range of. When the warp weaving density is less than 150 yarns / inch, the weaving density becomes coarse and dot pins enter into the voids where the base fabric warp and weft textures intersect during printing, and the dot pins are easily caught and cause damage. When the warp weave density is more than 260 / inch, it becomes difficult to weave a base fabric having a normal plain weave design. More preferably 1
70 to 230 pieces / inch.

Further, with respect to the range of the warp weave density,
When the weft weave density ratio is less than 0.35, the printing performance such as the printing clarity and high spot property is good, but the durability of the joint portion and the base cloth portion is deteriorated. Further, if this ratio exceeds 0.55, it will exhibit properties close to those of the current ink ribbon base fabric, and therefore printing performance, ink absorption,
Problems such as ink life will begin to appear.

According to the base fabric of the present invention having the above-mentioned constitution, high spots are exhibited even when inks having different viscosities, compounded dyes, pigments, or inks having different viscosities and having a tendency to deteriorate printing performance are impregnated. In addition, it is possible to obtain an ink ribbon which is excellent in printing clarity, ink absorbency, ink life, and is excellent in durability of the joint portion and the base cloth portion.

[0017]

EXAMPLES The present invention will be described in more detail below with reference to examples. The performance evaluation and measurement methods of the ink ribbon were carried out as follows. Ink absorptivity: The ink is impregnated by changing the coating amount, and after a certain period of time has elapsed after the coating, the impregnation state of the ink is judged from the impregnation state of the surface of the base fabric according to the following criteria, and the coating state is 4.5 grade or less The maximum amount of impregnation is calculated.

Grade 5 is free-flowing. Totally glaring,
There is no spotting. Class 4.5 Small glare and spots at 1 spot / 2 m. Grade 4 1 spot / 2m with glare and spots. Grade 3 2-3 spots / 2m with glare and spots. Grade 2 Over several spots / 2m with glare and spots.

The entire first grade has glare and spots. High spot: An ink ribbon with a different coating amount is filled in a cassette, left for a certain period, and then a solid pattern is printed by a dot printer. The degree of difference in the density of the print density in the initial print area is as follows.
Evaluation was made by classifying into 0 grade.

Grade 10 High spot no expression Grade 9 1% or less expression Grade 8 5% or less expression Grade 7 10% or less expression Grade 6 15% or less expression Grade 5 20% or less expression Grade 4 25% or less Expression 3rd class 30% or less expression 2nd class 40% or less expression 1st class 40% or more expression Ink life: 5 m of the ink ribbon is joined by an ultrasonic welding machine to form a ring, which is printed by a printer as an endless ribbon. After printing, the print density of a specific portion of a specific character on a specific page of the printing paper is set to OCR (OPTICAL CHARACT
R) tester to PCS (PRINT CONTRAS)
T SIGNAL) value.

Printing sharpness: Similar to the ink life, the ink ribbon 5m is connected to form a ring and printing is performed by a printer. After printing, the print densities at several specific places on a specific character of a specific page of the printing paper are measured by a PCS value with an OCR tester, and R of the density difference is obtained. In addition, the printing clarity is 20% of the ink adhesion rate.
Evaluation was performed using an ink ribbon of% owf. Durability of joints: Several ultrasonic welding conditions (pressure, clearance between horn and anvil, welding time, etc.) are set according to the thickness of each sample, and the joints are spaced at regular intervals for each condition. Create more than one. All this 2
Connect to a Mobius wheel of 0 m, set it in a cartridge and printer, and print. The ribbon is taken out from the printer and the cartridge every time a certain page has been printed, and the degree of damage to the joint is judged according to the following criteria. At this time, the damaged joints of grade 4 or lower are removed and printing is continued.
Finally, the last remaining joint becomes a joint under the optimum welding condition of one sample, and the number of printed pages of this best joint becomes the joining durability.

Class 1 Woven texture is not disturbed 1.5 Class Woven texture is disturbed 2nd grade 0.1mm or less fine pores 3rd grade 0.2mm or less fine pores 4th grade 1.0mm or less damaged holes 5 Grade 1.0 mm or more with damaged holes Printing durability of base fabric: Similar to the durability of the joint, each sample is taken at regular intervals and connected to a 20 m Mobius ring, set in a cartridge and printer for printing.

Each time the joint (joint portion) of the sample is in the third grade or lower state, the base cloth portion is judged according to the above-mentioned damage degree standard, and the jointing is continued and printing is continued. The number of pages at the time when the base cloth portion becomes the third grade or less is obtained, and is set as the durability value of the base cloth portion of this sample.

[0024]

Examples 1 to 4 and Comparative Examples 1 to 5 As warp yarns, two kinds of raw yarns of nylon 66 fibers having sulfuric acid relative viscosities of 2.6 and 3.0 as shown in Table 1 were used. Nylon 66 for weft
A plain weave design consisting of fibers 40d / 34f (untwisted) is designed and woven after finishing to set a finished warp density of 168 to 211 yarns / in and a weft / warp weave density ratio of 0.31 to 0.68. Was refined and finished under the same set conditions to obtain an ink ribbon base fabric. This is 13mm wide and 25m
The ink ribbons of Examples 1 to 4 and Comparative Examples 1 to 5 were slit by a width of m and inked, and the ink application amount was changed from the ink adhesion rate of 20% owf to the ink absorption limit and the applied surface was An ink ribbon was prepared by changing several conditions until it became an abnormal state, and the maximum amount of deposited ink was obtained. Also,
Using these ink ribbons, ink absorbency, printing performance (high spot property, ink life, printing clarity) and durability (bonding part, base cloth part) were measured and evaluated. The results are shown in Table 1.
Shown in

From Table 1, it can be understood that the ink absorbency and the printing performance are improved when the weft / density ratio is decreased. In particular, it is clear that the high spot property and the printing clarity are greatly improved. It can also be confirmed that the printing performance deteriorates when the weft / density ratio exceeds 0.55. The durability of the joint portion and the base cloth portion deteriorates slightly as the weft / warp density ratio decreases, but when the relative viscosity of sulfuric acid of the raw yarn is 3.0, the viscosity becomes 2.
6 was better than the ribbon base fabric having a weft / warp density ratio of more than 0.55. It is also clear that if the weft / warp density ratio is less than 0.35, the durability will be worse than that of the current product even if the yarn viscosity is 3.0.

[0026]

Examples 5 to 10 and Comparative Examples 6 to 9 As shown in Table 2, the relative viscosities of sulfuric acid of the raw yarns of nylon 66 fibers are 2.45 to 3.
Finished warp density after setting a plain weave design consisting of 40d / 34f (untwisted) nylon 66 fibers for the warp and weft using the original yarn No. 3 is 168 to 211 yarns / in, weft / warp weave density ratio 0.41 Designed to be ~ 0.68, woven,
The greige machine was refined, and an ink ribbon base cloth finished under the same set conditions was obtained. This was slit into a width of 13 mm and a width of 25 mm to obtain ink ribbons of Examples 5-10 and Comparative Examples 6-9. Similarly, inking was performed to prepare an ink ribbon in which the coating amount was changed from the ink deposition rate of 20% owf to several conditions until the coating surface became abnormal, and the maximum ink deposition amount was determined. Furthermore, the ink absorbency, printing performance, and durability were measured and evaluated using each ink ribbon. Table 2 shows the results.

Table 2 shows that the durability increases as the relative viscosity of sulfuric acid of the raw yarn increases. However, when the raw yarn viscosity is 2.45, the durability of the high-density fabric is greatly reduced,
In particular, it is below the limit of joint durability. Further, even if the original yarn viscosity is increased to 3.3 and the warp yarn is further densified, a remarkable effect on the joint durability is not recognized. Therefore, Table 2 shows that the relative viscosity of sulfuric acid of the raw yarn needs to be 2.5 or more and 3.2 or less. Further, it was confirmed that the effect of the viscosity of the raw yarn was difficult to be recognized on the ink absorbency and the printing performance.

[0028]

Examples 11 to 13 and Comparative Examples 10 and 11 Nylon 66
Finished warp density after setting a plain weave structure consisting of nylon 66 fibers 40d / 34f (untwisted) in warp and weft, with a relative viscosity of sulfuric acid of the raw yarn of the fiber being 3.0 to 148 to 195
An ink ribbon base cloth was designed and woven so as to have a book / inch, weft / warp weave density ratio of 0.41 to 0.74, refined raw fabric, and was finished under the same set conditions. This was slit into a width of 13 mm and a width of 25 mm to obtain the ink ribbons of Examples 11 to 13 and Comparative Examples 10 and 11, and inking was performed in the same manner, and the coating amount was changed from the ink adhesion rate of 10% owf to the abnormal coating surface. Several conditions were changed until the state was reached. The ink ribbon thus obtained was used to measure and evaluate ink absorbency, printing performance, and joint durability. The results are shown in Table 3.

Table 3 shows that the weft / warp density ratio is 0.55 or less, and the durability of the joint portion when the warp weave density is changed is better when the warp density is higher. Also, the density is 1
In the case of 49 lines / inch, the ink absorbency and the printing performance are slightly lowered, and the durability is also lowered, so that it is necessary to have a warp density of 150 lines or more.

[0030]

Examples 14, 15 and Comparative Example 12 The relative viscosities of sulfuric acid of nylon 66 fiber raw yarns are 2.6 and 3.0 as shown in Table 4.
30d as warp and weft using two kinds of raw yarn
A raw fabric having a plain weave structure of / 26f (untwisted) was refined to obtain an ink ribbon base fabric finished under the same set conditions. This was slit into a width of 13 mm and a width of 25 mm to obtain ink ribbons of Examples 14 and 15 and Comparative Example 12. In the same manner, using these ink ribbons, the ink absorbency, the printing performance, the joint durability, etc. were measured and evaluated. The results are shown in Table 4. Table 4 shows that when the relative viscosity of sulfuric acid of the raw yarn is 3.0 and the weft / warp density ratio is lowered to 0.55, the ink absorbency and printing performance are good and the durability is also good. Show. Further, when the warp density is 270 threads / inch, the durability is improved, but the printing performance tends to be slightly deteriorated, which means that the upper limit of the warp density is exceeded.

[0031]

Examples 16 to 18 and Comparative Examples 14 and 15 Nylon 66
As shown in Table 5, the raw thread sulfuric acid relative viscosity of the fiber is 2.45 to
10d / 5f as warp, using a raw yarn of 3.0,
30d / 26f, 40d / 34f, 50d / 34f twisted yarns, wefts 20d / 14f, 30d / 26f, 4
A plain weave fabric made of untwisted yarns of 0d / 34f, 70d / 34f, and 110d / 48f was refined to obtain an ink ribbon base fabric finished under the same set conditions. This was slit into a width of 13 mm and a width of 25 mm to obtain ink ribbons of Examples 16 to 18 and Comparative Examples 14 and 15. In the same manner, evaluation was performed using these ink ribbons. The results are shown in Table 5.

Table 5 shows that when the relative viscosity of sulfuric acid of the raw yarn is increased to 3.0 and the weft / warp density ratio is lowered to 0.55, the durability is remarkably lowered when the warp yarn is 10d.
It shows that the printing performance is not good. Denier of weft is 11
At 0d, it was confirmed that the durability was good, but the ink absorbency and the printing performance were deteriorated.

[0033]

[Table 1]

[0034]

[Table 2]

[0035]

[Table 3]

[0036]

[Table 4]

[0037]

[Table 5]

[0038]

The ink ribbon base fabric of the present invention has good ink absorbency, is excellent in print clarity even when used after being filled in a cassette and stored for a long time, and exhibits high spots. Even if the type of ink to be applied is changed, the ink ribbon can be remarkably improved and the ink life can be improved.

Further, unlike the conventional ink ribbon, it is not necessary to use a woven fabric having a special structure, and a simple plain weave structure may be used. Further, it is not necessary to increase the crimp angle for improving the printing performance as in the conventional case, and the obtained structure is obtained. The thickness of the ink ribbon
There is no need to increase it significantly. Further, when using the ink ribbon base fabric according to the present invention, speeding up due to an increase in print throughput, which has been particularly desired recently, high impact for printing a plurality of sheets, and sharpening of dot pins for improving print sharpness. It is possible to obtain an ink ribbon that can simultaneously satisfy many requirements such as improvement of the durability of the joint portion and the durability of the base cloth portion.

Claims (1)

[Claims] 1. A base cloth for an ink ribbon, comprising polyamide fibers having a sulfuric acid relative viscosity ηγ of 2.5 or more and 3.2 or less and a fineness of 20 to 100 denier, which constitutes the length direction of the base cloth. A base fabric for an ink ribbon, wherein the weft density of the weft threads constituting the width direction with respect to the weave density of the warp threads is 0.35 to 0.55, and the warp thread weave density is 150 to 260 threads / inch.