JPH0311913B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of conditioning the substrate of ink ribbons, particularly for computer embossing and other high speed printing applications.

In recent years, ink ribbons have come to be used in applications that require high speed and high precision, such as computer embossing, and the base fabric of ink ribbons has also been developed to have the performance needed to meet this demand. It has come to be made of thin threads woven with high density.
By the way, the base fabric of the ink ribbon for such applications is made of synthetic fiber yarn with a single yarn denier of 1.2 denier or less and a total denier of 40 denier or less, and the total number of warps and fibers per inch is 280 or more. It has become a textile.

In addition, computer-type printing, which was originally katakana and hiragana, has come to include kanji characters, and dot-type printing is particularly popular. The types of kanji that can be used are gradually expanding.

It is well known that conventionally, when weaving textiles, reeds with uniform reed density are used in order to arrange the warp threads at an even density to form the weft and fabric structure.

However, as shown in FIG. 3, the woven fabric 32 is stretched by the winding tension, and the strain caused by the tension applied to the weft yarns 32b during weaving tends to recover after weaving. In order to
After weaving, the woven fabric 32 generally contracts in the width direction, becomes narrower than the width of the reed 31, and is then rolled up. Therefore, all the warp yarns 32a are arranged in a width narrower than the width regulated by the reed 31, but the warp yarn density is concentrated only at both ends of the fabric 32 without being evenly aligned. This results in a difference in warp density between the periphery of both ears and the center.

At present, no problems have arisen due to the use of such fabrics with different warp densities as base fabrics for ink ribbons, except for problems related to fabric standards.

However, research by the present inventor has shown that if the base fabric of the ink ribbon has uneven fabric density, especially when printing kanji dots with a large number of strokes, the dot diameter may be small, resulting in variations in the amount of ink held by the base fabric and printing dots. It has been found that the influence of contact spots between the paper and the base fabric increases, making printing spots more likely to occur. As mentioned above, this problem has not become apparent because the number of kanji currently in use is limited, but it is clear that it will become a problem as the number of kanji used expands in the future.

The present invention aims to eliminate such hidden problems before they occur.

That is, the present invention aims to improve the number of reeds necessary for the fabric to be woven when manufacturing a base fabric that is woven with thin threads at high density and requires high performance, such as an ink ribbon for computer printing. Provided is a method for producing an ink ribbon with uniform warp density, characterized in that it is woven using reeds that have the same or slightly more number of reeds and that the reed density at both ends is coarser than that at the center. It is something to do.

To explain the present invention in more detail, as shown in FIGS. 1 and 2, in the present invention, a reed 1
The density of the reed 1' is dense at the center and coarse at both ends. Therefore, the warp threads 2 flowing near the reed 1
A is also dense in the center and coarse near both ends.

The warp threads 2a flowing in this way include the weft threads 2b
is driven into the fabric 2 and woven into the fabric 2. As described above, at the moment of weaving, the woven fabric 2 is equal to the width of the reed 1, but is wound up to a wider width due to the tension caused by winding and the elastic recovery force of the weft yarns 2b. Due to this widening, the warp yarns near both ends of the fabric 2 are gathered toward the center. However, in the present invention, as mentioned above, the density of the reed feathers 1' is not uniform, and both ends are coarser than the center, and the increase in warp yarn density near both ends of the fabric 2 due to width filling is prevented in advance. Since the weaving is performed by lowering the warp density near both ends by that amount, the wound fabric 2 has a substantially uniform warp density.

The increase in warp density due to width filling usually occurs within about 20 cm on both sides from the edge of the fabric.
It is sufficient if the reed feather density is made coarser than the center part within this range.

The degree to which the reed feather density is made coarser than in the center is determined by the extent to which the warp threads are brought closer to the center, and the closer the warp is to the selvedge, the greater the extent to which the warp threads are brought closer to the center. Therefore, rather than uniformly coarsening the reed feather density on both ends of the reed, it is better to gradually coarsen it from the boundary with the central uniform part of the fabric toward the ends, or to divide it into several stages. It is preferable to make the surface rough. When configuring the coarse density part of the reed, the warp density in the central uniform part of a fabric woven using a conventional reed with uniform reed density is Do, and the average warp density in the high density part near both ends is Dh, the average reed feather density d of the coarse density of the reed feathers to be constructed, when the relevant reed feather density is do
A good guideline is d=Do/Dh×do.

In addition, depending on the degree of normal use, the reed can be used upside down or left and right, in order to extend its lifespan. From this point of view, it is preferable that the reed used in the present invention be made to be equal to or slightly wider than the necessary thread width and symmetrical both vertically and horizontally, in accordance with the target fabric. However, the width of the woven fabric is not necessarily the same on the left and right sides, and is slightly larger on the weft exit side. Therefore, strictly speaking,
Although it is preferable to vary the degree of roughening on the left and right sides, it is generally sufficient to make the left and right sides symmetrical.

Furthermore, in jet looms and the like, a reed is attached to the reed for gripping and removing the weft ends, but the reed in the present invention is made by weaving a woven fabric of a constant width in order to coarsen the density of the reed feathers near both ends. Since it is economically advantageous to have a length that matches the width of the fabric to be woven, the reed part required for this weaving is a separate part as an auxiliary reed, and it can be attached and detached. It is preferable to leave it freely. By doing this, it becomes possible to attach the sakuari thread without interfering with the use of the reed vertically or horizontally.

Note that the reed used in the present invention is used only for fabrics of a certain width as described above, and its versatility is lost, but it can be used for fabrics of a certain width, such as the base fabric of an ink ribbon. In the case of weaving a material and slitting it for use, there is less need for versatility, and the benefits can be fully utilized.

As described above, according to the present invention, it is possible to obtain a woven fabric with uniform warp density, and if this is used as the base fabric of an ink ribbon, it will be possible to print kanji dots with a large number of strokes, which will be used more often in the future. There is no need to worry about printing spots.

The thread used in the present invention is required to be a synthetic fiber with a single thread denier of 1.2 or less and a total denier of 40 denier or less, in order to be used as the base fabric of the ink ribbon. The density of the woven fabric is 1 due to its performance as an ink ribbon.
The total number of warp and weft threads per inch must be 280 or more. Further, the synthetic fiber may be of any type as long as it is commonly used as a base fabric for ink ribbons.

Further, the present invention will be explained by Examples and Comparative Examples.

Example Both the warp and weft were 40d/34f 6-6 nylon, and a fabric was woven with a warp density of 170 threads/inch and a weft thread density of 118 threads/inch. When weaving, both ends
20cm reed feather density 44 feathers/inch, center part 5 feathers/inch
An inch-sized reed was used. The resulting woven fabric had a warp density of 166 threads/inch at the center and a warp density of 166 to 167 threads/inch at both ends.

Comparative Example Using the same yarn as in the example, three conventional reeds with a uniform reed density of 50 reeds/inch were woven in the same manner.
The resulting woven fabric had a warp density of 166 warps/inch at the center and 168 to 170 warps/inch at both ends. There was a difference in warp density between ~4 warps.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a weaving state according to the present invention, FIG. 2 is a diagram showing a reed used in the present invention, and FIG. 3 is an explanatory diagram of a weaving state according to a conventional method. 1: reed, 1': reed feather, 2: woven fabric, 2a: warp,
2b: Weft.

Claims (1)

[Claims] 1 The warp is a synthetic fiber with a single yarn denier of 1.2 denier or less and a total denier of 40 denier or less, and the total number of warp and weft yarns per inch is
When manufacturing 280 or more woven fabrics, use reeds that have the same number of reeds as or slightly more than the number of reeds required for the fabric to be woven, and that the reed density at both ends is coarser than that at the center. 1. A method for producing an ink ribbon base fabric having a uniform warp density, the method comprising: