JP3121139B2 - ink ribbon - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink ribbon using a polyamide multifilament yarn. More specifically, the present invention relates to an ink ribbon having good durability against printing of characters such as a printer character or dot pins.

[0002]

2. Description of the Related Art With the widespread use of computers in various fields in recent years, printing systems for terminal devices have been dramatically developed. Usually, the printing system refers to type printers, dot printers, typewriters, and other office equipment.The ink ribbon is indispensable for the printing section of these printing systems, and is generally used for fabrics of polyamide multifilament yarn. What is impregnated with ink is used.

The characteristics required for an ink ribbon include:
Small damage to the base fabric due to printing, dimensional change of the base fabric,
There are few meandering, clear printing, and no stain on the printing paper. In particular, with regard to damage to the base fabric due to printing, the material becomes fatigued and worn, and eventually breaks or becomes missing characters due to repeated printing and imprinting of the printer type or dot pins. Ink ribbons with even better printing durability of the base fabric have been eagerly desired due to the speeding up of printing with the increase in the amount, the sharpness of type and dot pins for sharp printing, the increase in impact, etc. .

[0004] Techniques satisfying this requirement have been disclosed in Japanese Patent Application Laid-Open Nos. 57-45087 and 60-16-16.
Japanese Patent Application Laid-Open No. 1184, Japanese Patent Application Laid-Open No. 62-92981, and the like have made improvements in the characteristics of yarns used for ink ribbons, and these characteristics have been defined and disclosed. However, what actually affects the printing durability of the ink ribbon is not the properties of the original yarn, but the characteristics of the woven yarn after each step of weaving and processing.

[0005] Therefore, an ink ribbon formed by a conventional method that focuses only on the characteristics of the yarn is not sufficient to cope with the recent high-speed and high-impact printers, and satisfies the above requirements. At present, no such ink ribbon has been found yet.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an ink ribbon which is excellent in durability against printing imprints such as print characters or dot pins of a printer.

[0007]

Means for Solving the Problems In order to improve the printing durability of the ink ribbon, the present inventors have studied in detail the relationship between the characteristics of the yarn used for the ink ribbon and the printing durability of the ink ribbon. As a result, the properties of the original yarn are greatly changed by going through various steps such as preparation, weaving, and processing until the ink ribbon is formed, and even if the ink ribbon uses the same original yarn, It has been found that they are completely different due to differences in performance and conditions of each process.

In view of the above, the present inventors have sought to improve the printing durability of the ink ribbon more universally. As a result, to improve the printing durability of the ink ribbon, preparation, weaving, processing, etc. After passing through the process, it has been found that it is necessary to optimize the characteristics of the woven yarn constituting the ink ribbon itself, particularly the woven yarn in the longitudinal direction. In particular, it has been found that the maximum effect can be obtained by optimizing the processing conditions in order to obtain an ink ribbon satisfying the constitution of the present invention as described below, and the present invention has been completed.

That is, the present invention provides a polyamide multifilament yarn constituting the ink ribbon in the longitudinal direction, a relative sulfuric acid viscosity ηr, an intermediate elongation ME at a load of 2.5 g / d,
An ink ribbon characterized in that breaking energy E satisfies 2.8 ≦ ηr ≦ 3.2 10 ≦ ME ≦ 25 (%) 18 ≦ E ≦ 40 (g · cm / d).

[0010] The sulfuric acid relative viscosity ηr here is 25
Polymer concentration in a 95.5% strength sulfuric acid solution at 1.degree.
The relative viscosity of the solution adjusted to be 0%. The breaking energy E is defined as the maximum point of the strength in the stress-strain curve (SS curve, FIG. 1) obtained by the constant-speed elongation test method shown in JIS-L1070.
S, when the elongation at that time is DE, it is the energy required for elongation from the start of elongation to the DE, and is usually a range surrounded by an SS curve indicated by oblique lines in FIG. 1 and a horizontal axis. Corresponding to the area of

The present invention provides a wide ribbon for a type printer,
A narrow endless ribbon with both ends joined in a Mobius shape,
Alternatively, the effect is exhibited in any ink ribbon such as a seamless ribbon obtained by cutting a tubular fabric. As the woven yarn constituting the length direction of the ink ribbon of the present invention, it is preferable to use a multifilament yarn made of a polyamide polymer such as nylon 6 or nylon 66, and more preferably a nylon 66 multifilament yarn.

At this time, the relative viscosity ηr of sulfuric acid of the polyamide polymer must be 2.8 or more and 3.2 or less. If ηr is less than 2.8, the effect of improving the printing durability expected by the present invention is weak, and if ηr exceeds 3.2,
Due to the high degree of polymerization, the fiber becomes hard, it is difficult to increase the crimp rate of the base fabric, and problems arise in the dimensional stability and ink retention of the ink ribbon.

Further, the intermediate elongation M of the woven yarn constituting the length direction of the ink ribbon of the present invention at a load of 2.5 g / d is measured.
E needs to be 10% or more and 25% or less. If the ME is less than 10%, an ink ribbon having a high elongation modulus, that is, a so-called hard and fragile ink which is weak in printing is formed. Conversely, if the ME is over 25%, the base fabric becomes soft. Since it becomes too much, it is easy to be depressed by printing, and there is a problem in running property in the cartridge.

Further, the breaking energy E of the yarn constituting the length direction of the ink ribbon of the present invention is 18 g · cm / cm.
d and 40 g · cm / d or less. When E is less than 18 g · cm / d, the ink ribbon does not stick to printing and has low shock absorption. In the case of a woven yarn having an E of more than 40 g · cm / d, the dimensional stability of the base fabric is deteriorated, which is not practically preferable.

The ink ribbon of the present invention can be obtained by the following manufacturing method. First, a polyamide polymer having a sulfuric acid relative viscosity ηr of 2.8 or more and 3.2 or less and a water content of 0.1% or less is heat-compressed and melted, and discharged from a spinneret having a single yarn hole diameter of 0.1 mm or more. Linear velocity 15m / mi
Extruded at n or more to form a yarn and cooled and solidified. The yarn is appropriately subjected to an intermediate treatment such as application of a spinning oil agent and application of confounding by an interlacer, and then is taken up by a first godet roll (hereinafter referred to as a GD roll) at room temperature at a speed of 1000 m / min or more.

Subsequently, the first GD roll and 100 ° C.
Between the second GD roll heated above, then between the second GD roll and the third GD roll heated above 100 ° C.,
By performing two-stage thermal stretching at a total stretching ratio of 1.4 times or more, the intermediate elongation under a load of 2.5 g / d is 4.0 to 10.0.
% And a breaking energy E of 35 to 50 g · cm / d.

The polyamide multifilament yarn constructed as described above is woven into a woven yarn constituting the length direction of the ink ribbon, and then subjected to processing steps such as scouring and heat setting to obtain the ink of the present invention. A ribbon is obtained, but the performance and conditions of each step, especially the processing step, are as follows:
This has a significant effect on the printing durability of the ink ribbon.

This is because, as described above, the characteristics of the woven yarn of the ink ribbon, particularly the woven yarn in the longitudinal direction, greatly change depending on the difference in the performance and conditions of the processing steps. Therefore, in order to maximize the effects of the present invention, it is important to perform processing under conditions such that the properties of the woven yarn in the length direction of the ink ribbon satisfy the configuration of the present invention. is there.

Specifically, in the scouring step, continuous scouring with an open soaper, relaxed scouring with a vibrating scouring machine or hanging kneading, etc. can be applied. ° C and the immersion time is 20 to 1 when using an open soaper or a vibrating scouring machine.
It is preferably 20 seconds, and in the case of hanging kneading, 10 to 60 minutes.

In the drying step, no matter what equipment is used, such as a cylinder dryer, a short loop dryer, a net-free dryer, etc.
It is important to keep the heating to a minimum of ~ 120 ° C.
Thereafter, heat setting and tentering are performed by a pin tenter. The conditions at this time are a setting temperature of 160 to 190 ° C., a timing of 10 to 60 seconds, a tentering rate of 0 to 5.0%, and an overfeed rate of 0 to 10. It is preferable to fall within each range of 0%.

[0021]

The present invention will be specifically described below with reference to examples of the present invention.

[0022]

EXAMPLE 1 34 filaments per yarn, total denier 40 consisting of nylon 66 polymer having ηr of 2.83
Denier, intermediate elongation under a load of 2.5 g / d is 7.9%,
Weaving was performed using nylon 66 yarn having a breaking energy of 41.6 g · cm / d as the weft to obtain a green fabric having a warp density of 210 yarns / inch and a weft yarn density of 117 yarns / inch.

The greige was continuously scoured using an open soaper having a scouring time of 40 seconds and a process speed of 70 m / min in the order of hot water washing at 60 ° C., alkali scouring at 90 ° C., hot water washing at 70 ° C., and pH adjustment. Process and remove glue. After this,
After drying with a cylinder drier at 120 ° C., an ambient temperature of 182 ° C. and a timing of 12
The fabric was tentered at an overfeed rate of 1.5% and a tentering rate of 2.1% in seconds, and was subjected to dry heat setting to obtain a plain fabric having a warp density of 215 yarns / inch and a weft yarn density of 126 yarns / inch.

The woven fabric is cut into a width of 25 mm so that the warp direction is the length direction, and an oil-based ink is applied to form an ink ribbon. .8m endless ink ribbon, 225 using KD-36 line dot printer manufactured by Hitachi Koki
The printing durability was evaluated by visually determining the degree of damage to the base fabric after printing all characters according to the following criteria.

No damage to the base fabric: ○ Slightly fluffy: △ Notably fuzzy: ×

[0026]

Example 2 Example 1 was carried out using the same greige machine as in Example 1, except that the temperature of the alkaline scouring bath was 80 ° C., the rate of overflow during setting was 1.8%, and the rate of tentering was 2.0%. A plain woven fabric having a warp density of 214 yarns / inch and a weft yarn density of 125 yarns / inch was obtained.

The woven fabric was used as an endless ink ribbon in the same manner as in Example 1, and the same printing evaluation as in Example 1 was performed.

[0028]

Example 3 The same greige machine as in Example 1 was used, except that the temperature of the alkaline scouring bath was 70 ° C., the overfeed rate during setting was 2.0%, and the tentering rate was 1.6%. A plain woven fabric having a warp density of 212 yarns / inch and a weft yarn density of 125 yarns / inch was obtained.

The woven fabric was used as an endless ink ribbon in the same manner as in Example 1, and the same printing evaluation as in Example 1 was performed.

[0030]

EXAMPLE 4 34 filaments per yarn, total denier 40 consisting of nylon 66 polymer having ηr of 3.12
Denier, intermediate elongation under load of 2.5 g / d is 6.0%,
Weaving was performed using nylon 66 yarn having a breaking energy of 28.0 g · cm / d for the weft, and a green fabric having the same weaving density as in Example 1 was obtained.

The same processing as in the second embodiment is performed on this green machine.
A plain woven fabric similar to that of Example 2 was obtained. This was used as an endless ink ribbon in the same manner as in Example 1, and the same printing evaluation as in Example 1 was performed.

[0032]

Example 5 Double weaving was carried out using the same raw yarns as in Example 1, and both warp and weft densities were 140 yarns / inch and circumference 2.0.
m was obtained. This was washed with 70 ° C water for 5 minutes, 8
30 minutes alkali scouring at 0 ° C, 5 minutes washing at 70 ° C,
In the order of H adjustment, the suspension was kneaded without tension to remove the glue.

Next, the woven fabric was placed in a mold having a circumference of 1.8 m and subjected to a dry heat treatment at 120 ° C. for 30 seconds.
A cylindrical plain woven fabric having a circumference of 1.8 m and a weft density of 56 yarns / inch and a weft density of 158 yarns / inch was obtained. This woven fabric was cut into a width of 25 mm so that the circumferential direction became the length direction, and oily ink was applied to form a seamless ink ribbon. The same printing evaluation as in Example 1 was performed.

[0034]

Example 6 The same yarn as in Example 4 was used except that ηr was 2.98, and weaving and processing were performed in the same manner as in Example 5 to give a warp density of 152 yarns / inch and a weft yarn density of 154 yarns / inch. And a cylindrical plain woven fabric having a circumference of 1.8 m. This fabric was used as a seamless ink ribbon in the same manner as in Example 5, and the same printing evaluation as in Example 1 was performed.

[0035]

Comparative Example 1 Using the same greige machine as in Example 1, the alkali refining bath temperature was 50 ° C.
Example 1 except that 1.0% and the tentering rate were -1.0%
A plain woven fabric having a warp density of 217 yarns / inch and a weft yarn density of 122 yarns / inch was obtained.

The woven fabric was used as an endless ink ribbon in the same manner as in Example 1, and the same printing evaluation as in Example 1 was performed.

[0037]

[Comparative Example 2] Using the same greige machine as in Example 1, the alkali refining bath temperature was set at 95 ° C, the set atmosphere temperature was set at 200 ° C,
Timing 15 seconds, overfeed rate 12.0
% And a tentering rate of 7.0% were processed in the same manner as in Example 1, and the warp density was 210 yarns / inch and the weft density was 13%.
A plain woven fabric having 0 threads / inch was obtained. Example 1
In the same manner as in Example 1, an endless ink ribbon was used, and the same printing evaluation as in Example 1 was performed.

[0038]

Comparative Example 3 Using the same greige machine as in Example 4, the overfeed rate at the time of setting was -1.0%, and the tentering rate was -1.0%.
%, A plain woven fabric having a warp density of 217 yarns / inch and a weft yarn density of 121 yarns / inch was obtained. This fabric was used as an endless ink ribbon in the same manner as in Example 1, and the same printing evaluation as in Example 1 was performed.

[0039]

Comparative Example 4 A circumference 2.0 obtained in the same manner as in Example 5.
m was set in a mold having a circumference of 2.0 m, and the same suspension kneading as in Example 5 was performed. Thereafter, a dry heat treatment at 120 ° C. for 30 seconds was performed in a state of being fitted into the form, to obtain a cylindrical plain woven fabric having a circumference of 2.0 m and a warp density of 140 threads / inch and a weft density of 142 threads / inch. .

The woven fabric was used as a seamless ink ribbon in the same manner as in Example 5, and the same printing evaluation was performed as in Example 1 except that the number of printing characters was 2.5 million characters.

[0041]

Comparative Example 5 A circumference 2.0 obtained in the same manner as in Example 6.
m was set in a mold having a circumference of 2.0 m, and the same suspension kneading as in Example 5 was performed. Thereafter, a dry heat treatment at 120 ° C. for 30 seconds was performed in a state of being inserted into the mold to obtain a cylindrical plain fabric having a circumference of 2.0 m and a warp density of 140 threads / inch and a weft density of 141 threads / inch. .

The woven fabric was used as a seamless ink ribbon in the same manner as in Example 5, and the same printing evaluation was performed as in Example 1 except that the number of printing characters was changed to 2.5 million characters. Table 1 shows the above results. In addition, the physical properties of the woven yarn in the length direction of the ink ribbon shown in Table 1 were determined as follows. First, the weaving yarn in the length direction of the ink ribbon of each of the above examples is loosened from the weaving structure so as not to apply a tension as much as possible. An initial load (g) corresponding to 1/10 of the denier is applied to the loosened yarn to apply the constant speed elongation test method (JIS-L) described above.
1070), and the obtained SS curve (FIG. 1)
We need more.

[0043]

[Table 1]

From Table 1, the printing durability of Comparative Examples 1 to 5 is as follows.
It turns out that it does not reach the example of the present invention.

[0045]

As described above, the ink ribbon of the present invention has excellent durability, which can sufficiently cope with recent high-speed and high-impact printers.

[Brief description of the drawings]

FIG. 1 is a view showing a stress-strain curve (SS curve) of a fiber.

Continuation of the front page (56) References JP-A-61-104883 (JP, A) JP-A-62-92881 (JP, A) JP-A-62-273876 (JP, A) JP-A-57-45087 (JP) JP-A-59-176077 (JP, A) JP-A-5-96847 (JP, A) JP-A-4-185711 (JP, A) JP 2-58364 (JP, B2) (58) Field surveyed (Int.Cl. ⁷ , DB name) B41J 31/04 D01F 6/60 311

Claims (1)

(57) [Claims] 1. The sulfuric acid relative viscosity ηr of a polyamide multifilament yarn constituting the length direction of an ink ribbon,
An ink ribbon, wherein the intermediate elongation ME and the breaking energy E at a load of 2.5 g / d are respectively in the following ranges. 2.8 ≦ ηr ≦ 3.2 10 ≦ ME ≦ 25 (%) 18 ≦ E ≦ 40 (g · cm / d)