JPS6242798B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for manufacturing endless ink ribbons used in various printers, typewriters, etc. The purpose is to improve the bonding durability of the ink ribbon and to provide an ink ribbon with a dramatically increased lifespan. Conventionally, ink ribbons for printers or typewriters are wound around bobbins or reels, which takes time and effort to replace, easily staining hands and objects when replacing the ribbon, and furthermore, the effective length of the ribbon during use is limited. Recently, a system in which an endless ribbon is stored in a cartridge to facilitate ribbon replacement has become widely used. However, ultrasonic bonding and high-frequency bonding are generally used to make this ribbon endless, but these methods fuse the bonded areas, which reduces the fiber gap that serves as an ink tank, and causes damage to the area near the bonded areas. Ink life is significantly reduced. Therefore, even if printing is possible normally in the non-bonded portion, missing characters occur due to the fusion bonding, and the ink ribbon no longer functions as an ink ribbon. The ink ribbon has no choice but to be discarded. In addition, the bond strength and impact strength of fused joints are inferior to non-joint parts, so
There was a problem in that the ink ribbon had to be discarded due to damage to the bonded portion even if the non-bonded portion was still fully usable. The present invention solves the above problems related to endless ink ribbons. The gist of the present invention is an endless ink ribbon in which ink ribbons are overlapped, the ink ribbons themselves are melt-cut and temporarily joined, and the temporary joining protrusions that are generated at that time are thermally pressed and joined by heat welding. In the manufacturing method, a substance having adhesive ability mainly composed of thermoplastic synthetic resin, heat-resistant oil, and heat-resistant A method for producing an endless ink ribbon, characterized by applying at least one substance selected from the group consisting of liquid resins. The configuration, embodiments, and effects of the present invention will be explained in more detail below. In the present invention, the thermal welding bonding consisting of melt cutting and thermocompression bonding of the ink ribbon includes ultrasonic bonding, ultrasonic bonding,
It refers to internal heating bonding such as high frequency bonding, external heating bonding such as impulse bonding, and hot plate bonding. Among these, external heating bonding requires the heat cut surface temperature to be set at a high temperature of at least 50°C or higher depending on the melting point of the fiber material that makes up the ink ribbon, which has the disadvantage of promoting deterioration of the fabric attached to the bonded area. be. On the other hand, in the internal heating method, only the portion to be joined can be heated, so there is no problem like the external heating method. However, in the case of high-frequency bonding, some fiber materials cannot be bonded satisfactorily due to the dielectric properties of the fiber materials. Therefore, in the thermal welding bonding of the present invention, ultrasonic bonding is the most preferable bonding method from the viewpoints of bonding workability, bonding uniformity, stability of bonded portion strength, and the like. In the present invention, since the ribbon is made endless by heat welding, the fiber material constituting the ink ribbon is preferably a thermoplastic synthetic fiber or a polyamide synthetic fiber such as nylon 66 or nylon 6. What is important in the present invention is that when the ink ribbons are overlapped and the ink ribbons themselves are melted and cut to join, the ink ribbons are to be joined at the joining part or a material having adhesive ability at the joining part, or
The first thing to do is to apply a substance that has a smoothing ability.
Methods for applying and bonding such a substance include a thermal fusion bonding method in which a substance is applied to the area to be bonded before melting and cutting the ink ribbon, and after melting and cutting, the temporary bonding protrusions that are generated at that time are thermally bonded; Alternatively, a thermal fusion bonding method in which ink ribbons are overlapped and melted and cut, a substance is applied to the temporary bonding protrusions that are formed at that time, and then the temporary bonding is bonded by heat is applied, or the temporary bonding that occurs after the ink ribbons are melted and cut. There is a method of applying such a substance to the bonded portion where the bonding convex portion is bonded by thermocompression. As mentioned above, there are three timings for applying the substance having adhesive ability and the substance having smoothing ability.
Which of these methods to use can be selected depending on the type of material to be applied, workability, durability of the material, etc. However, from the viewpoint of workability and durability, temporary bonding that occurs after melting and cutting the ink ribbon is important. It is preferable to apply it to the temporary bonding protrusion at the time of thermocompression bonding the protrusion. In the present invention, materials having adhesive properties mainly composed of thermoplastic synthetic resins include ethylene vinyl acetate resin, polyamide resin, polyolefin resin, polyurethane resin, acrylic ester resin, and polyester resin. Among these, when joining an ink ribbon by heat welding, it has good compatibility and miscibility with the heat melt of the fiber material that makes up the ribbon.
In addition, polyamide resin is preferable since it can provide high adhesive strength. Any nylon such as nylon 6, nylon 66, nylon 8, 12 nylon, or copolymerized nylon can be used as the polyamide resin, but these should be selected appropriately as they differ in form and ease of use at the time of application. There is a need. The forms of thermoplastic synthetic resins including these polyamide resins include liquids such as organic solvent solutions, emulsions, and suspensions; powders; and sheet-like products such as films, woven fabrics, knitted fabrics, and nonwoven fabrics. A liquid material is preferred from the viewpoint of properties, and a sheet material is preferred from the viewpoint of durability of the joint. In general, endless ribbons joined by heat welding are used after being reinked because the amount of ink near the joint has decreased.
Alternatively, among sheet-like materials, woven or knitted fabrics, non-woven fabrics, etc. are preferable, and knitted fabrics with high stretchability are particularly preferable from the viewpoint of ease of removing unnecessary ends after joining. The amount of these to be applied may be appropriately selected in consideration of durability, print clarity, reinkability, workability, etc. When using a liquid material, the undiluted solution or diluted solution may be applied to the area to be joined or the joint area. The sheet-like material preferably has a thickness comparable to or less than that of the ink ribbon. In the present invention, examples of the heat-resistant oil include silicone oil, vegetable oil, mineral oil, liquid paraffin, etc., and examples of the liquid heat-resistant resin include compatibility with the hot melt of the constituent fiber material of the ink ribbon, Organic solvent solutions such as silicone resins and fluorocarbon resins with good miscibility, liquid materials such as emulsions, suspensions, etc. are preferable. These have excellent thermal stability and smoothness. Heat resistance here refers to heat resistance to the extent that it does not volatilize, change in quality, or decompose due to the heat applied to the ribbon during heat welding and bonding of the ink ribbon. Such a substance having smoothing ability may be used in combination with the above-mentioned substance having adhesive ability, or may be applied in multiple stages at the same time or at different times. According to the present invention, the durability of the bonded part is significantly improved compared to conventional endless ink ribbons, and the conventional endless ink ribbon has the disadvantage of being discarded even though the non-bonded part is fully usable due to holes in the bonded part. This solves the problem. The present invention will be explained in more detail with reference to Examples below. Example 1 Leona 66 (66 nylon registered trademark manufactured by Asahi Kasei Industries, Ltd.) 40 denier, woven fabric (vertical density 170 pieces/2.54
cm, horizontal density 115 lines/2.54 cm) was cut into a 13 mm width and inked with oil-based ink to make an ink ribbon with a coating amount of 20%. Cut this ink ribbon to 2.7m, twist one side half way and overlap each other with both ends crossed at 30 degrees.
It was melted and cut using an ultrasonic welder (manufactured by Branson), and the resulting temporarily joined convex portions were thermocompression bonded using the same ultrasonic welder to form an endless ribbon with a circumference of 2.5 m. At this time, substances (drugs or sheet-like materials) shown in the following table were applied or interposed at each time point A, B, and C below. The obtained endless ribbon was run on a serial line printer (manufactured by Hitachi Koki Co., Ltd.) to check printing durability. The results are shown in the table below. Application of chemicals and sheet-like material, time of intervention A Time of melting and cutting of the part to be joined B Before thermocompression bonding of the temporary joining convex part after melting and cutting C Joint part after thermocompression bonding

[Table] In the blank of Experiment No. 1 (conventional bonding), the printing durability with the printer was 25 pages using the application sheet, whereas the material with adhesive ability mainly composed of thermoplastic synthetic resin The method of the present invention (No. 2, 3, 4, 5,
According to 6, 8, 9), the number of pages used was 45 to 116 pages, which was 2 to 4 times more durable than a blank. On the other hand, when chloroprene was used in Experiment No. 7, the number of pages used was the same as in Experiment No. 1. In addition, according to the method of the present invention (Experiment No. 10, 11, 12, 13, 14, 15, 16) in which a substance with smoothing ability was applied, the number of pages used was 43 to 68 pages and 2 blank pages.
We were able to increase the durability by ~3 times.

Claims (1)

[Scope of Claims] 1. An endless ink ribbon in which ink ribbons are overlapped, the ink ribbons themselves are melted and cut to temporarily join, and the temporary joining protrusions generated at that time are then thermally pressed and joined by heat welding. In the manufacturing method, a substance having adhesive ability mainly composed of a thermoplastic synthetic resin, a heat-resistant oil, A method for producing an endless ink ribbon, comprising applying at least one substance selected from the group consisting of: and a liquid heat-resistant resin. 2. The method for manufacturing an endless ink ribbon according to claim 1, wherein the melt cutting and thermocompression bonding are performed by an internal heating method. 3. The method for manufacturing an endless ink ribbon according to claim 2, wherein the internal heating method is an ultrasonic method. 4. The method for manufacturing an endless ink ribbon according to claim 1, wherein the substance having adhesive ability mainly composed of a thermoplastic synthetic resin is a polyamide resin. 5. Manufacture of the endless ink ribbon according to claim 1 or 4, using a substance having adhesive properties mainly composed of thermoplastic synthetic resin in the form of a knitted fabric, a nonwoven fabric, a solvent solution, or a dispersion liquid. Method. 6. The method for producing an endless ink ribbon according to claim 1, wherein the liquid heat-resistant oil or heat-resistant resin is silicone. 7. The method for producing an endless ink ribbon according to claim 1, wherein the heat-resistant oil or heat-resistant resin liquid is fluorocarbon.