JPH0118875B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing multicolor ink ribbons for color typewriters.

Traditionally, multicolor ink ribbons have been manufactured by impregnating or coating each half of a type ribbon material of different colors in the width direction of a type ribbon material made of woven material such as silk, cotton, or synthetic fibers. There are known methods for containing it.
However, in the case of multicolor ink ribbons manufactured by such a method, especially when dye inks are used, two types of different colored inks that come into contact with each other at the boundary line of each ink layer may interact with each other or It has the disadvantage that it permeates through the contact area from either side due to capillary action and mixes with each other. These drawbacks not only cause problems with the product defect rate during manufacturing, but even with multicolor ink ribbons that pass the product shipping inspection, there are problems with the storage stability of the product, especially when the ribbon is used. As the ink content of each layer or a part of the layers decreases, the permeability of the inks to each other or from other ink layers becomes more pronounced due to capillary phenomenon, etc., which is a drawback as a product. In order to solve such problems,
Currently, colored inks based on pigments are used, but these are not sufficient to solve the problems mentioned above, and furthermore, as the number of prints increases compared to inks based on dyes, the number of times the number of printing increases increases. There are also problems with the product lifespan, such as the color of the letters fading quickly.

To overcome these drawbacks, a method has been proposed in which a linear thermally fused area is formed between the ink layers of each color to prevent the inks from penetrating each other (Japanese Unexamined Patent Publication No. 1983-1999).
(See Publication No. 128412). When using this method, color mixing between ink layers can be completely prevented, but since the typeface is in direct contact with the ink, color mixing that occurs when the ink adhering to the typeface is impacted by different ink layers cannot be avoided. .

Furthermore, a method has been proposed in which a multicolor ink ribbon is manufactured by laminating multiple ribbon materials impregnated with inks of different colors onto an ink-impermeable film in parallel at predetermined intervals (Japanese Patent Application Laid-Open No. 133108-1982). (see publication). In this case, the presence of an ink-impermeable film on the back surface of the ribbon material can prevent ink color mixing through the impact head. However, because the film is attached to the entire back surface of the ribbon material by heat-sealing or adhesive, the molten resin or adhesive permeates unevenly into the ribbon material, which is the part of the ribbon where the image is formed, and this causes the ribbon to become imprinted. There is a drawback that the amount of ink impregnated in the image forming area is non-uniform.

Further, a pair of ribbon-like pieces (each impregnated with ink of a different color) made by fusing a ribbon material and an ink-impermeable film at both edges along the longitudinal direction are superimposed so that the films are in contact with each other,
It has been proposed that a pair of two-color ink ribbons can be obtained by melt-cutting the ribbon at the center of its width, dividing it into two pieces, and opening each of the divided ribbon pieces (Japanese Patent Publication No. 14293/1983). reference).

However, in this method, the ribbon materials of a pair of ribbon-shaped pieces are melted and cut once and then re-fused, so the joining parts of the ribbon materials are not sufficiently melted, leaving pinholes easily, and the barrier property against ink is poor. In addition, it is not possible to completely prevent ink from mixing, and the strength of the joint is insufficient. Furthermore, when the ribbon is stacked, cut and melted and then opened, the melted part protrudes to the front of the ribbon due to the melting pattern and comes into contact with the recording paper, resulting in an unexpected stain on the recording paper.

In view of the above points, the present invention completely prevents problems such as color mixing due to ink penetration between ink layers, ink color mixing mediated by an impact head, and non-uniform ink impregnation amount, and also provides a sufficient ink ribbon. It is an object of the present invention to provide a multicolor ink ribbon which has high strength, does not cause unexpected staining of recording paper, and can prevent the ribbon from being folded.

In order to achieve this object, the present invention provides heat supply means having one or more heat supply sections at appropriate intervals in the width direction of a type ribbon material made of a heat-fusible woven fabric material, and A type ribbon material for a color typewriter, which comprises forming one or more linear melting areas on a type ribbon material to form two or more ink layers, and then allowing each ink layer separated by the linear melting areas to contain ink. In the method for manufacturing a color ink ribbon, an ink-impermeable synthetic resin film is superimposed on the back surface of the type ribbon material, and the heat is supplied while a hot melt adhesive is present in the area where the linear melted portion is to be formed. contact means to melt at least the type ribbon material and the hot melt adhesive without cutting either the type ribbon material or the film to form one or more linear melted portions in the type ribbon material. The gist of the present invention is to provide a method for manufacturing a multicolor ink ribbon for a color typewriter, which comprises forming the type ribbon material and bonding or heat-sealing the type ribbon material and the film at the linear melting portion.

With the above configuration, in the linear melting part of the ribbon material, the hot melt adhesive mainly penetrates and fills the fabric weave of the ribbon material, so there are no defects such as pinholes, and therefore the ink does not penetrate between the ink layers. color mixing is completely prevented. In addition, the formation of the linear melted portion involves cutting the ribbon material, and since the ribbon material is melted in the presence of a hot melt adhesive, excessive melting of the ribbon material is prevented.
It has sufficient strength as a ribbon. In addition, the presence of an ink-impermeable synthetic resin film on the entire back side of the ribbon material prevents ink color mixing via the impact head, and since the ribbon material and film are not bonded at the printing area, There is also no problem that the amount of ink impregnated is non-uniform. Furthermore, since the ribbon material and film are overlapped to form a melted part and the melted part is used as a ribbon in that state, there is no tendency for melting to occur, resulting in problems such as staining of the recording paper. do not have. Furthermore, since the synthetic resin film reinforces the ribbon material, it prevents the ribbon material from being damaged by printing, increasing the durability of the ribbon, and also prevents the ribbon from folding during typing.

In this way, the present invention solves all the problems of the prior art.

Moreover, in the present invention, by forming the linear melted portion and adhering or fusing it with the film in the presence of a hot melt adhesive, there is no need to excessively melt the ribbon material, increasing production speed. It has the advantage of high work efficiency.

Next, embodiments of the method of the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view showing one embodiment of the method of the invention, and FIG. 2 is a schematic sectional view of another embodiment of the method of the invention. FIG. 3 is an enlarged schematic cross-sectional view of the tips of various heat supply means.
4 is a schematic sectional view taken along the line XX in FIG. 1, and FIG. 5 is a schematic sectional view taken along the line Y-Y in FIG. 1.

In Fig. 1, a type ribbon material 1 made of a heat-melting woven fabric material and a synthetic resin film 2 are overlapped and a hot melt adhesive is placed on the type ribbon material or between the type ribbon material and the synthetic resin film. By means such as a tension roll or a winding roll,
It passes over the support 3 at an appropriate speed. A heat supply means 4 having three tip portions is brought into contact with the type ribbon material 1 from the side of the type ribbon material 1 on the support 3 to form three linear melted portions A, and at the same time the linear At the melting part A, the synthetic resin film 2 and the adhesive part or the heat-sealing part B are formed, and the type ribbon material 1 and the synthetic resin film 2 are laminated. The ribbon edge portions may or may not be bonded or heat-sealed, and even if they are bonded or heat-sealed, they are not counted as the linear fused portions A and heat-sealed portions B in the present invention.

The four ink layers 5 separated by the three linear melted areas A thus formed are impregnated or coated with different inks, such as black, red, yellow, and blue inks, to create four colors. A color ink ribbon is formed.

Incidentally, as shown in FIG. 2, the heat supply means may also be brought into contact with the synthetic resin film 2 side.

As the heat supply means, one having one tip shown as a to d in FIG. 3 may be used,
You may use the thing which has three tip parts shown as e-h. Further, a plurality of heating rolls or a blade-shaped heat supply means may be used.

The linear fused portion A may be formed at the same time as cutting a wide thermofusible woven fabric material into a plurality of type ribbon widths, or may be performed successively. Furthermore, as the heat-melting woven fabric material used for type ribbon material 1, polyamide fibers such as nylon 66 and nylon 6, or polyester fibers are particularly preferably used because of their high tensile strength and elongation modulus. Ru. The temperature of the supply section of the heat supply means for melting such polyamide woven fabrics and polyester woven fabrics is usually selected from the range of 130 to 300°C. The tension speed of the type ribbon material 1 is usually selected from a range of 0.1 to 1 m/sec. By combining such temperature and speed, the desired linear melt zone A is formed. The width of the linear fused portion A is usually preferably about 0.1 to 3 mm; if it is less than that, the ink barrier effect will be reduced, and if it is more than that, it will affect the printed surface, so neither is preferred.

To explain the hot melt adhesive used in the present invention, the main component is an ethylene-vinyl acetate copolymer, a tackifier such as a rosin derivative,
Hot-melt adhesives obtained by mixing waxes such as microcrystalline waxes, antioxidants, and fillers such as titanium oxide are solids in the form of blocks, pellets, or rods at room temperature. Suitably used. The solid hot-melt adhesive is placed on the type ribbon material or in the area where a linear fusion zone is to be formed between the type ribbon material and the synthetic resin film, and heated to bond the type ribbon material and the synthetic resin film together. At the same time, a linear fused portion is formed. The formed linear melted part and bonded part are cooled and become sufficiently hard. In the present invention, by using a hot-melt adhesive, the formation of a linear fusion zone and the adhesion or fusion between the type ribbon material and the synthetic resin film can be achieved, for example, by using a hot-melt adhesive.
It can also be carried out at temperatures as low as 200°C.

By using a hot melt adhesive, the bonding time is extremely short, speeding up production and improving work efficiency.

Examples of synthetic resin films include polyester such as polyethylene terephthalate film, nylon 6 film, nylon 11 film,
Synthetic resin films with excellent strength such as polyamide films such as 66 nylon film and 610 nylon film are used. Thickness is 3~150μ
A thickness of approximately 10 to 25 μm is desirable from the viewpoint of printing quality and bending strength.

Impregnation and application of the ink to the formed ink layer 5 can be easily carried out by applying the ink to the type ribbon material side using a roll coater.

Note that, in order to more completely prevent mutual penetration between the ink layers, two linear fused portions may be provided close to each other.

When using the multicolor ink ribbon obtained by the method of the present invention, the type characters are printed from the synthetic resin film 2 side, and the ink is recorded by pressing the ink layer 5 through the synthetic resin film 2. It is printed on paper.

As described above, when using the method of the present invention,
It completely prevents ink from penetrating into other ink layers due to capillary action, and also prevents contamination by the typeface of the typeface, resulting in a semi-permanent color print image that is extremely clear and free from color mixture. In addition, the ink layer is protected from the type by the laminated synthetic resin film, so the type does not come into direct contact with the type ribbon substrate.
The durability of the type ribbon substrate is therefore increased. Furthermore, the folding of the ribbon, which often occurs when the type ribbon substrate is used alone, can be eliminated by the ribbon obtained by the method of the present invention, which is laminated with a synthetic resin film. As described above, the effects of the method of the present invention are extremely large.

The number of ink layers formed in the method of the present invention is not limited as long as it is two or more, but usually there are four ink layers corresponding to the four colors of red, blue, yellow, and black, or four ink layers corresponding to the four colors of red, blue, yellow, and black. Seven ink layers are formed corresponding to seven colors: yellow, black, brown, and purple.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing one embodiment of the method of the present invention, FIG. 2 is a schematic cross-sectional view of another embodiment of the method of the present invention, and FIG. 3 is a respective view of the tips of various heat supply means. Expanded schematic cross-sectional view, Figure 4 is the X in Figure 1
- An X-line sectional view; FIG. 5 is a Y--Y sectional view of FIG. 1; Main symbols of the drawing, 1: Type ribbon material, 2:
Synthetic resin film, 4: heat supply means, 5: ink layer, A: linear melting section, B: heat fusion section.

Claims (1)

[Scope of Claims] 1. Heat supply means having one or more heat supply portions are brought into contact with a type ribbon material made of a heat-melting woven fabric material at appropriate intervals in the width direction of the type ribbon material. Manufacturing a multicolor ink ribbon for a color typewriter by forming two or more ink layers by forming the above linear melting areas, and then allowing each ink layer separated by the linear melting areas to contain ink. In the method, an ink-impermeable synthetic resin film is superimposed on the back surface of the type ribbon material, and the heat supply means is brought into contact with the hot-melt adhesive present in the region where the linear melted portion is to be formed. , melting at least the type ribbon material and the hot melt adhesive without cutting either the type ribbon material or the film to form one or more linear melted portions in the type ribbon material; A method for producing a multicolor ink ribbon for a color typewriter, characterized in that the type ribbon material and the film are bonded or heat-sealed in a melting section. 2. The method according to claim 1, wherein the hot melt adhesive is interposed between the type ribbon material and the synthetic resin film. 3. The method of claim 1, wherein the thermofusible woven material is polyamide or polyester. 4. The method according to claim 1, wherein the synthetic resin film is a polyamide film or a polyester film.