JP2003103889A - Cloth for ink ribbon - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cloth for ink ribbon for impact printer having excellent lifetime and durable against long term use by improving clearness and durability of typing simultaneously. SOLUTION: The cloth of ink ribbon is a fabric of polyamide multifilament having a total linear density in the range of 33-55 decitex satisfying the following requirements (a-h) simultaneously; (a) mass weight W (g/m<2> ) 40<=W<=60, (b) thickness TH (μm) 90<=TH<=110, (c) weave density ratio F (warp/weft) 1.0<=F<=1.2, (d) warp total weave density D (piece/2.54 cm) 270<=D<=300, (e) tensile strength S (Newton/cm) 150<=S<=300, (f) percentage elongation E(%) 40<=W<=60, (g) total cover factor K 1700<=K<=1900, (h) crimp rate ratio C (warp/ weft) 4<=C<=8.

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 which is excellent in printing clarity and printing durability of an ink ribbon used in an impact type printer.

[0002]

2. Description of the Related Art An ink ribbon is a typewriter, a register or the like, which is mainly mechanically impacted, that is, a dot wire-pin, a metal plate or the like is applied to the ink ribbon to transfer the ink contained in the ink ribbon to a printing paper. Characters are formed. As the material used as the base cloth, synthetic fibers such as polyamide having a large mechanical resistance are generally used.

On the other hand, in recent years, printers have been demanded to have high speed and clear printing due to the advent of new printers such as laser, ink jet and photographic systems as a printing system which does not require mechanical impact. However, increasing the speed of printers increases the mechanical impact on the ink ribbon, and it is no longer durable for long-term use.Therefore, there is a long-felt need for ink ribbons with long printing life and excellent printing clarity. There is.

Recently, an ink ribbon used in an impact type printer is a cassette type in which a long tape-shaped ink ribbon is housed in a cassette and both ends of the ink ribbon are melt-bonded by an ultrasonic welder to form an endless shape. It is becoming mainstream.

In such an ink ribbon, the head pin of the printer is repeatedly subjected to shocks, which damages the base fabric portion, cuts single yarns, and causes fuzzing, resulting in marked deterioration of the sharpness of printing. Is. This is because there is a relation between the durability of the printed portion of the base cloth and the sharpness of printing, and when the damage of the base cloth is large, the movement of the ink to the printed portion due to the capillary phenomenon becomes poor.

Further, as a method for improving the printing sharpness,
An ink ribbon having a small thickness is desired, but there is a problem that durability is significantly deteriorated. Therefore, there is an increasing demand for improvement in the printing life of the ink ribbon.

As means for solving the above-mentioned problems, Japanese Patent Application Laid-Open No. 60-161184 proposes single yarn denier and breaking strength of ink ribbon fibers. Further, in JP-A-62-928881, the range of viscosity of the polymer constituting the ink ribbon fiber is specified, and in JP-A-6-64288, the breaking energy of the ink ribbon fiber- It has been proposed that the stress-strain characteristics of the fiber, such as the yield point strength and the elongation after the yield point, be within a specific range. Further, as a method of thinning the base fabric for the ink ribbon, Japanese Patent Laid-Open No. 2-23118 proposes to reduce the single yarn fiber degree and the number of filaments.

Although various proposals have been made in this way, none of them has reached the level of satisfying the recent demands for high speed and high impact.

[0009]

SUMMARY OF THE INVENTION In view of the background of the prior art, the present invention simultaneously improves the sharpness of printing by ink-ribbon embossing and the durability of embossing, and has an excellent life as an ink ribbon and long-term use. It is intended to provide an excellent ink ribbon base fabric for impact printers that withstands the above.

[0010]

The present invention employs 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 woven fabric made of polyamide multifilament yarn having a total fineness within the range of 33 to 55 decitex, and simultaneously satisfies the following requirements (a to h). It is characterized by. (A) Basis weight W (g / m ² ) 40 ≦ W ≦ 60 (b) Thickness TH (μm) 90 ≦ TH ≦ 110 (c) Weave density ratio F (warp / weft) 1.0 ≦ F ≦ 1. 2 (d) Warp total weaving density D (book / 2.54 cm) 270 ≤ D ≤ 300 (e) Tensile strength S (newton / cm) 150 ≤ S ≤ 300 (f) Elongation at break E (%) 40 ≦ E ≦ 60 (g) Total tar cover factor-K 1700 ≦ K ≦ 1900 (h) Crimping ratio C (warp / weft) 4 ≦ C ≦ 8

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is for an impact printer excellent in the above-mentioned problems, that is, the printing sharpness by ink-jetting of ink ribbon and the ink-jet durability are improved at the same time, and the ink ribbon has a long life and can be used for a long time. It was made clear that the above problems can be solved all at once by thoroughly studying the above ink ribbon base fabric and satisfying specific fabric characteristic conditions.

The polyamide multifilament in the present invention comprises nylon 6.6, nylon 6, nylon 12,
Nylon 4.6 and copolymers of nylon 6 and nylon 6.6, and polyamide multifilaments obtained by copolymerizing nylon with polyalkylene glycol, dicarboxylic acid, amine, etc., among which nylon 6.6
A polyamide multifilament consisting of is preferred. The fiber may contain various additives which are usually used for improving the productivity or the characteristics in the manufacturing process and the processing process of the raw yarn. For example, a heat stabilizer, an antioxidant, a light stabilizer, a leveling agent, an antistatic agent, a plasticizer, a thickener, a matting agent, a viscosity stabilizer, etc. can be contained.

In the present invention, it is essential that the base fabric made of polyamide multifilament yarn satisfies all the following characteristic conditions.

On the other hand, the single yarn fineness, the total fineness, the number of filaments, and the tensile strength / elongation of the fibers constituting the polyamide multifilament yarn referred to in the present invention are the conditions that affect the durability and the life. It is important that the total fineness of the polyamide multifilament yarn is within the range of 33 to 55 decitex. Further, the sulfuric acid relative viscosity of the polyamide multifilament yarn is in the range of 2.8 to 3.5, the single yarn fineness is 1.3 to 3.3 decitex, the number of filaments is 20 to 40, Tensile strength is 0.0
It is a preferable condition for forming the base fabric that the breaking elongation is 5% or more and the breaking elongation is 30% or more. (A) Basis weight W (g / m ² ) 40 ≦ W ≦ 60 (b) Thickness TH (μm) 90 ≦ TH ≦ 110 (c) Weave density ratio F (warp / weft) 1.0 ≦ F ≦ 1. 2 (d) Warp total weaving density D (book / 2.54 cm) 270 ≤ D ≤ 300 (e) Tensile strength S (newton / cm) 150 ≤ S ≤ 300 (f) Elongation at break E (%) 40 ≦ E ≦ 60 (g) Total Cover Factor-K 1700 ≦ K ≦ 1900 (h) Crimping ratio C (warp / weft) 4 ≦ C ≦ 8 Here, the basis weight of the base cloth is durability against typed characters. Has a close relationship with the clearness of printing, and when the amount is small, the durability decreases,
When the amount is large, the durability is improved, but the thickness of the base fabric becomes thicker and the sharpness of the printing becomes worse. Therefore, it is necessary to design within the above range.

Next, the thickness of the base cloth has the same relation as the above-mentioned base cloth unit weight, but when the ink is usually applied to the base cloth and then filled in the cassette as an ink ribbon, the base cloth is filled. Since the thinner the thickness of the ink ribbon, the longer the length of the ink ribbon that can be filled in the cassette, the thinner the thickness of the ink ribbon set can be, the more important the present invention is. Requirements.

Further, the tensile strength of the base cloth is preferably large in order to obtain the durability of the base cloth, but the above range is preferable from the viewpoint of cost. Next, it is important that the breaking elongation of the base fabric is within the above range in consideration of the texture of the base fabric and the strength of the base fabric.

The weaving density ratio represents the ratio of the number of weft yarns to the number of warp yarns, and the weaving density ratio is 1.0 to
The range of 1.2 is important because the thickness of the woven fabric becomes thin, which contributes to the sharpness of printing and the durability of the base fabric.

Further, the total cover factor has a warp total fineness d1 (decitex) warp density of N1 (pieces / 2.
54 cm) and the total weft fineness d2 (decitex) weft density is N2 (pieces / 2.54 cm), (d1) ^1/2 ×
It is represented by N1 + (d2) ^1/2 × N2, and this condition is
It is important from the standpoint of durability of the base fabric that the range is 1700 to 1900.

The crimp ratio is the ratio of the crimp ratio of the warp and the weft obtained by decomposing the woven fabric constituting the base fabric. That is, a predetermined length (L1) is provided in the warp direction and the weft direction of the woven fabric, the yarn is disassembled from the woven fabric, and the yarn length (L2) when a load of 0.1 g / decitex is applied to this yarn Measure the crimp rate (L2-L
1) / L1 × 100, and the respective crimp ratios thus obtained, that is, the crimp ratios of the warp yarns are divided by the crimp ratios of the weft yarns, and expressed as crimp ratio ratios.

In the present invention, it is important that the crimp ratio is in the range of 4 to 8 from the viewpoint of printing durability of the base cloth portion.

The woven fabric constituting the base fabric of the present invention is preferably smelted with a treatment liquid whose pH (pH) is preferably less than 8, more preferably pH 7 or less at the time of smelting, from the viewpoint of color development of the ink. .

In the woven fabric constituting the base fabric of the present invention, the content of titanium oxide contained in the yarn is preferably 0.15% by weight or less, and more preferably the titanium oxide is not contained at all (0% by weight). %) Is preferable from the viewpoint of the fusion property of the base fabric.

Further, in the woven fabric constituting the base fabric of the present invention, twist processing of 150 to 600 T / m, or 300
Although it can be used after being subjected to false twisting of 0 to 5000 T / m, it is preferable not to insert a twisted yarn in terms of cost reduction.

Further, in the present invention, for the purpose of improving the weaving, entanglement treatment of about 5 to 100 / m with compressed air can be performed at the stage of producing the raw yarn. A plain weave, an induction plain weave, a twill weave, a satin weave, a modified weave, and the like are used as the woven structure of the ink ribbon base fabric, but the woven structure is not particularly limited thereto.

The weave density of such a woven fabric is preferably 160 to 150 warp yarns / 2.54 cm, more preferably 1 warp yarn.
The number of weft yarns may be 50 to 140 yarns / 2.54 cm, and the weft yarns may preferably be about 150 to 130 yarns / 2.54 cm.

Toe, which is the total number of the weft density,
Tall weave density D (books / 2.54cm) is 270-300 threads / 2.
Within the range of 54 cm, the clarity of the print, the strength of the base cloth,
It is important for durability.

The ink ribbon base fabric thus obtained is
After being woven, it is scoured and finished. As such refining, refining is preferably performed by liquid flow refining, and the pH of the treatment liquid at that time is adjusted to less than 8 to refine the refining,
The pH of the fabric should be controlled below 8. After such refining, it is preferable to finish set in a range of 160 ° C to 220 ° C with a pin tenter. After that, an appropriate amount of ink material such as ordinary oil-based ink is attached (impregnated) to the base cloth,
Fusing to form an endless ink ribbon. Such fusion bonding is performed by using ultrasonic welders on both ends of the ink ribbon base fabric.

The ink ribbon base fabric of the present invention may be subjected to appropriate post-treatments such as high-pressure fluid treatment, air flow treatment, plasma treatment, surfactant treatment, and resin treatment. The ink ribbon thus obtained, which is formed by using the ink ribbon base fabric of the present invention, has a long life, high speed, and high durability as an ink ribbon excellent in base fabric part durability and printing sharpness and long-term use. It is possible to provide an ink ribbon base fabric and an ink ribbon suitable for an impacted printer.

[0029]

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 base cloth part] The prepared base cloth for ink ribbon is melt-cut to a width of 13 mm, and once with scissors, a base cloth for ink ribbon having a total length of 1 m is prepared. After that, the oil-based ink (CBK manufactured by Sakata Inx Co., Ltd.
-30) is applied at 22% by weight, and then ultrasonic welder is applied.
(M-8400 manufactured by Branson Co., Ltd.) and fused to form an endless ink ribbon. The obtained ink ribbon was used in a 24-pin dot printer (VP-1 manufactured by Epson Corporation).
30K) cassette, set this cassette in the above printer, print letters and numbers, 250
Check the pinholes of the base fabric for each line, read the number of lines printed by the pinholes, and use it as the base fabric durability. [Print sharpness] 13 mm of the created ink ribbon base fabric
Fuse to width and once scissors to make ink ribbon base cloth with a total length of 1 m. After that, for these base fabrics, for the weight of the base fabric,
Oily ink (CBK-30 manufactured by Sakata Inx Co., Ltd.)
% By weight, and then fused by an ultrasonic welder (M-8400 manufactured by Branson Co.) to prepare an endless ink ribbon. The obtained ink ribbon is stored in a cassette for a 24-pin dot printer (VP-130K manufactured by Epson Corp.), the cassette is set in the printer, letters and numbers are printed, and the ink density of the letter is M.
It was measured with an ink densitometer PCM-II manufactured by acbethd, and the number of print lines at which the character density became 0.4 PCS or less was defined as the life of sharpness.

[Tensile Strength and Elongation] Determined by the JIS L-1096 strip method.

[Crimp ratio] After the length L1 is provided in the warp direction and the weft direction of the woven fabric and the yarn is disassembled from the woven fabric,
It is determined from the following equation, where L2 is the yarn length when a load of 0.1 g / decitex is applied to the yarn.

{(L2-L1) / L1} × 100 Example 1 The total fineness of the nylon 66 polymer having a sulfuric acid relative viscosity of 2.8 and a titanium oxide content of 0.02% by weight is 44.
Decitex, single yarn fineness 1.3 decitex, filament number 34 filaments, tensile strength 0.005
A multifilament yarn having a decitex per newton and an elongation at break of 58% was prepared. The multifilament yarn was not twisted, but was used as warp and weft in the combinations shown in Table 1, and the weaving density was 145 warps / 2.
After producing a woven fabric having a plain weave design of 54 cm and 145 wefts / 2.54 cm of the combinations shown in Table 1, scouring these woven fabrics by an ordinary method and adjusting the pH of the woven fabric to less than 8. After finishing setting, a base fabric for an ink ribbon was prepared.

With respect to these base fabrics for ink ribbons, ink ribbons were prepared based on the above-mentioned test method, and the durability of each base fabric and the clearness of printing were measured, and the results are shown in Table 1.

Example 2 The total fineness of a nylon 66 polymer having a relative viscosity of sulfuric acid of 2.8 and a titanium oxide content of 0.02% by weight is 44.
Decitex, single yarn fineness 1.3 decitex, filament number 34 filaments, tensile strength 0.051
A multifilament yarn having a Newton / decitex and a breaking elongation of 56% was prepared, respectively. The multifilament yarn was not twisted, but was used as a warp and a weft according to the combination shown in Table 1, and the weaving density was 150 warps / 2.
After making the woven fabrics having the plain weave design of the combination shown in Table 1 of 54 cm and 140 wefts / 2.54 cm, the woven fabrics were scoured by a usual method and adjusted to have a pH of less than 8. After finishing setting, a base fabric for an ink ribbon was prepared.

With respect to these base fabrics for ink ribbons, ink ribbons were prepared based on the above-mentioned test method, and the durability of each base fabric and the clearness of printing were measured, and the results are shown in Table 1.

Example 3 The total fineness of a nylon 66 polymer having a relative viscosity of sulfuric acid of 2.8 and a titanium oxide content of 0.02% by weight is 44.
Decitex, single yarn fineness 1.3 decitex, filament number 34 filaments, tensile strength 0.052
Newton / decitex and multifilament yarn with an elongation at break of 44% were prepared. The multifilament yarn was not twisted, but the combination shown in Table 1
Used for warp and weft, weave density is 143 warps / 2.54
After making a woven fabric having a plain weave design of the combination shown in Table 1 of cm and 135 wefts / 2.54 cm, the woven fabric is scoured by a usual method and adjusted to a pH of less than 8 After finishing setting, a base fabric for an ink ribbon was prepared.

For these ink ribbon base fabrics, ink ribbons were prepared based on the above-mentioned test method, and the durability of the base fabric and the printing clarity were measured, and the results are shown in Table 1.

Comparative Example 1 The total fineness of the nylon 66 polymer having a relative viscosity of sulfuric acid of 2.8 and a titanium oxide content of 0.02% by weight is 33.
A multifilament yarn having a decitex, a single yarn fineness of 0.9 decitex, a filament number of 34 filaments, a tensile strength of 0.05 centiton / decitex, and a breaking elongation of 45% was prepared. The multifilament yarn was not twisted, but was used as a warp and a weft according to the combinations shown in Table 1, and the weaving density was 160 warps / 2.
Fabrics having a plain weave design of 54 cm and 120 wefts / 2.54 cm of the combinations shown in Table 1 were prepared, and then these fabrics were scoured and finish-set by a usual method to prepare an ink ribbon base fabric.

With respect to these ink ribbon base fabrics, ink ribbons were prepared based on the above-mentioned test method, and the durability of each base fabric and the printing sharpness were measured, and the results are shown in Table 1.

Comparative Example 2 Total fibrinity of 44 made of nylon 66 polymer having a sulfuric acid relative viscosity of 2.8 and a titanium oxide content of 0.02% by weight.
Decitex, single fiber fibrosis 1.3 decitex, filament number 34 filaments, tensile strength 0.05
A multifilament yarn having a decitex per newton and a breaking elongation of 52% was prepared. The multifilament yarn was not twisted and was used as a warp yarn and a weft yarn in a combination shown in Table 1, and the weaving density was 170 warps / in, weft 11
After producing a woven fabric having a plain weave design of a combination of 5 fibers / in shown in Table 1, these woven fabrics were scoured and finish-set by an ordinary method to produce an ink ribbon base fabric.

With respect to these base fabrics for ink ribbons, ink ribbons were prepared based on the above-mentioned test method, and the durability of each base fabric and the printing sharpness were measured. The results are shown in Table 1.

[0044]

[Table 1]

As is clear from Table 1, the products of Examples 1 to 3 were superior in durability of the base cloth portion and the sharpness of printing as compared with the comparative examples. On the other hand, Comparative Examples 1 and 2 were poor in durability of the base cloth portion and the clearness of printing of the base cloth, and could not be put to practical use.

[0046]

According to the present invention, it is possible to provide an ink ribbon suitable for a high-speed and high-copy type printer having excellent durability of a base cloth, excellent printing clarity, and strong impact.

Claims (2)

[Claims] 1. A woven fabric made of polyamide multifilament yarn having a total fineness within a range of 33 to 55 decitex, and at the same time satisfying the following requirements (a to h). Base cloth. (A) Basis weight W (g / m ² ) 40 ≦ W ≦ 60 (b) Thickness TH (μm) 90 ≦ TH ≦ 110 (c) Weave density ratio F (warp / weft) 1.0 ≦ F ≦ 1. 2 (d) Warp total weaving density D (book / 2.54 cm) 270 ≤ D ≤ 300 (e) Tensile strength S (newton / cm) 150 ≤ S ≤ 300 (f) Elongation at break E (%) 40 ≦ E ≦ 60 (g) Total tar cover factor-K 1700 ≦ K ≦ 1900 (h) Crimping ratio C (warp / weft) 4 ≦ C ≦ 8 2. The base fabric for an ink ribbon according to claim 1, wherein the polyamide multifilament is a non-twisted yarn.