JPS63296974A - Film ribbon for impact printer - Google Patents

Abstract

PURPOSE:To suppress the wear of a printing member and to maintain preferable printing quality for a long period by providing a polyamide resin layer on a film base face on which an ink layer is not formed. CONSTITUTION:A film ribbon for an impact printer is made of a film base, an adhesive layer formed on the base, and an ink layer which contains resin, an oil agent having poor compatibility with the resin and a colorant. A polyamide resin layer of 0.3-5.0 mum is provided on the film base on which the ink layer is not formed. When a printing is conducted by using the film ribbon, the printing member of a print head is brought into contact with the film base through the polyamide resin layer. Accordingly, even if the printing is conducted for a long period, the wear of the printing member can be suppressed to a very small value.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a film ribbon for impact printers, and more particularly to a film ribbon for wire dot printers.

More specifically, the present invention relates to a film ribbon for impact printers that has a sponge-structured ink layer and is used as a jingle strike type, multi-strike type, or overstrike type.

[Prior Art] Impact serial printers, especially wire dot printers, are currently used in large numbers as peripheral terminals for office computers and word processors, and the ink ribbons used in these printers are made of cloth as a base material. There are two types of ribbons: fabric ribbons made of plastic film, and film ribbons made of plastic film. Conventionally, film ribbons have been made by melt-coating a mixture of a wax material and a coloring material such as a dye or pigment, or by melt-coating a mixture of a wax material and a colored material such as a dye or pigment, or a film ribbon which is made of a resin that is incompatible with the resin, as shown in JP-A-59-9082. It is coated with a mixture of oil and colorant, and because of its high print clarity, it is used preferentially over fabric ribbons in impact printers that require high print quality.

In addition, for the future, wire dot printers as well.
There is a movement toward higher definition and higher density, such as the wire pins of the wire dot head becoming ultra-thin and the number of wire pins increasing to 24 or more, making it no longer possible to use conventional film ribbons for impact printers. To date, no attempt has been made to create a film ribbon for impact printers that can accommodate such movements.

[Problem that the invention seeks to solve]

In the conventional film ribbon for impact printers as mentioned above, the printing member such as the wire bin or print hammer of the print head comes into direct contact with the plastic film base material surface during printing, so during long-term use, the tip of the printing member that comes into contact This has the problem that good print quality cannot be maintained due to wear and chipping of parts, and this problem has been highlighted as a particularly noticeable problem when high-density heads and ultra-fine wires are used to achieve high print quality. has been done.

The present invention is intended to solve these problems, and its purpose is to provide a film ribbon for impact printers that suppresses abrasion of type members and maintains high print quality even after long-term use. There is a particular thing. A further object is to provide a film ribbon for impact printers that can be used with high-density heads and ultra-fine wires.

[Means for Solving the Problems] The film ribbon for impact printers of the present invention comprises a film base material, an adhesive layer provided on the base material, a resin, and an oil agent and a colorant that are poorly compatible with the resin. In a film ribbon for an impact printer comprising an ink layer containing 0.
It is characterized by having a polyamide resin layer with a thickness of 3 μm to 5.0 μm.

The film ribbon for impact printers of the present invention can be produced by known methods.

Generally, the resin components of the ink layer include polyvinyl chloride resin, polyvinyl acetate resin, vinyl chloride-vinyl acetate copolymer, and styrene-methyl methacrylate copolymer. A resin selected from polyvinyl butyral, bow urethane, polyvinyl alcohol, methyl cellulose, ethyl cellulose, etc. is used, and this resin is mixed and dissolved in a volatile solvent, and then a dispersion of an oil agent and a coloring agent that are poorly compatible with the resin is added. Produced by mixing and dispersing in a dispersing machine such as a ball mill, sand mill, grain mill, etc., applying it on the film base material or the adhesive layer of the film base coated with an adhesive layer using a coater, wire bar, doctor blade, etc., and drying. can do.

Examples of oils that are poorly compatible with resins include vegetable oils such as castor oil, rapeseed oil, cottonseed oil, and linseed oil; animal oils such as beef tallow, lard, lanolin, lecithin, and whale oil; other mineral oils; vaseline, DOP, glycerin, and liquid paraffin. used. Coloring agents include carbon black, iron oxide, alkali blue, brilliant blue, Miloli blue, methyl violet, orange red, iosol red, brilliant green, etc., and one type or a mixture of two or more types may be used depending on the purpose.

For the adhesive layer of the film base material, vinyl chloride-vinyl acetate copolymer, acrylic resin, butyral resin, styrene-butadiene copolymer, urethane resin, and other resins used for ink layers can be used.

The thickness of the ink layer is preferably 5.0 .mu.m to 21.0 .mu.m, more preferably 5.0 .mu.m to 19.0 .mu.m, and still more preferably 10.0 .mu.m to 17.0 .mu.m. Further, the thickness of the adhesive layer between the film base material and the ink layer is 2.
It is preferably 0 μm or less.

As the film base material, a film selected from polyimide film, aramidof, ilm, polyethylene terephthalate film, polyethylene naphthalate film, and polypropylene film can be used. In addition, these may be coated on both sides or on one side as appropriate, taking into consideration the compatibility with the ink resin mixture and polyamide resin during coating, and adhesion.
Surface treatment (general surface treatment such as corona treatment, plasma treatment, UV treatment, etc.) may be performed.

The polyamide resin to be formed as the low-wear layer can be synthesized by a known synthesis method, for example, by condensation polymerization of dimer acid and polyamine, has a molecular weight of 1000 to 4000, and contains toluene, isopropyl alcohol (hereinafter referred to as IPA),
Solvent-soluble polyamide resins that are soluble in ethanol (hereinafter referred to as EtOH), methyl cellosolve, methyl ethyl ketone, methylene chloride, etc. are suitable, and the resin layer formed after being applied has a thickness of 0.3 μm or more. The thickness is preferably 5.0 μm, more preferably 0.5 μm to 3.5 μm, and even more preferably 0.5 μm to 2.5 μm.

Suppose that the polyamide resin layer to be formed is 0. If the thickness is 3 μm or less, the effect of the low-wear layer cannot be found, and in the case of long-term printing, the tip of the wire member (type member) is found to wear to the same extent as conventional film ribbons, and even if When the polyamide resin layer exceeds 5.0 μm,
Although the wear of the wire member is almost suppressed, the thickness of the film ribbon is affected, resulting in a decrease in print quality during printing. This is particularly noticeable when using a high-density head or ultra-fine wire.

When printing is performed using the film ribbon for impact printers obtained in this way, the printing member (print wire or print hammer) of the print head comes into contact with the film base material through the polyamide resin layer, so the printing member Since the coefficient of friction between the film ribbon and the film ribbon is reduced, wear of the printing member can be kept extremely low even when printing is performed for a long period of time. Further, it is possible to realize a film ribbon for an impact printer that can be used satisfactorily even when using a high-density head and an ultra-fine wire.

[Example] Next, the present invention will be explained with reference to Examples.

Example 1 Low abrasion agent: Polyamide resin (manufactured by Kao Corporation: Reomide S-6800, molecular weight 2700') Ink components Part by weight Colorant: carbon black 7. 0 Alkaline Blue 5. 0 Resin: Vinyl chloride-vinyl acetate copolymer 14.0 (manufactured by Denki Kagaku Co., Ltd.: Denkavinyl #1000LT3) Oil agent: Liquid paraffin 14. .

(Nippon Oil Co., Ltd.: K-230) Dispersion oil 4. 0 (1, C, 1, JAPAN Co., Ltd.: Solus Bars #
17000) Volatile solvent: Toluene 28.0 Methyl ethyl ketone 28.0 The above polyamide resin was dissolved in a mixed solvent of toluene/IPA = 271 to prepare a 30% polyamide resin solution, and a 7.0 μm polyethylene terephthalate film was coated using a rod coater. (hereinafter referred to as PET) was coated and dried to obtain a polyamide resin layer with a thickness of 1.0 μm. Next, an ink liquid was prepared by dispersing the mixture of the above ink components in a sand mill for 12 hours, and this ink liquid was applied using a rod coater onto a PET film on which a polyamide resin layer was not formed, and heated at 100"C for 2 hours. Heat and dry for a minute.
A film ribbon for impact printers with an ink layer thickness of 17.5 μm was obtained.

Next, the wire bin tip diameter is 0.20 mm, 0°15 mm.
, 0.10 mm wire bins were used for the head bins, and impact dot heads with 24, 32, and 48 bins were used, and the film ribbon for impact printers shown in Example 1 was used. Image printing, character printing, etc. were performed, and evaluations of A1 to A3 were performed, and good results were obtained.

(A1) Print dot diameter (dot reproducibility); shown in the following formula,
Required printing dot diameter (d) for wire bin diameter (W), W = 0.20mm: d≦0, 25mm buttock: = 0.15
: d≦0.20 w=o, 10 : d≦0.15 When the actual dot diameter for each wire bin was measured, all of them were satisfied.

(A1) Print density (PC8 density); Pure white is O1 Pure black is 1
．． PO2 value of index expressing concentration as 0 (PC8≧0.8
When I measured the results (whether or not), I was satisfied. The measurement was carried out using a Macbeth reflection densitometer (PCM-
T,) was used.

(A3) Wire bottle abrasion resistance: After 120 hours of continuous printing, the head was disassembled and the difference in the length direction of the wire bottle from the initial printing time (D: PJ wear amount) was measured.
D≦0.010 mm, and there was no problem with printing quality.

Note that the wire pin used in the impact dot head used for the evaluation of this example may have the same pin diameter over its entire length, or may be wired with a ribbon as necessary in consideration of strength. It is also possible to use a wire pin in which only the tip of the wire pin that is in contact with the wire is thinned.

Example 2 Low wear agent: Polyamide resin (Sanyo Chemical Industries, Ltd.: Polymide 5-40 E) After dissolving the above polyamide resin in a mixed solvent of toluene/IPA = 1/1 to prepare a 40% polyamide resin solution. The coating was applied onto the untreated surface of the film base using a rod coater and dried to obtain a polyamide resin layer with a thickness of 2.0 Atm. Next, a methyl ethyl ketone solution of styrene-butadiene copolymer was applied to the surface treated surface on which polyamide resin was not formed, and the solution was heated and dried at 80'C. The ink liquid prepared in Example 1 was applied onto the film base material provided with an adhesive layer of &1°0 μm using a wire bar, and after heating and drying at 120°C for 2 minutes, the impact printer shown in Table 1 was applied. A film ribbon was obtained.

Table-1 *PET: Polyethylene terephthalate film PEN: Polyethylene terephthalate film P engineering:
Ho0shiimide0 film PP: Ho0rif 60 Hi0ren film Example 3 Low abrasion agent: Polyamide resin (manufactured by Kao Corporation: Reomide S-2400, molecular weight 2900) Ingredients Part by weight Colorant:
Carbon black 6.0 alkali blue
4.0 Resin: Vinyl chloride-vinyl acetate copolymer 13.0 (electrochemical (
Co., Ltd.: Denkavinyl #1OOOLT3) Polyvinyl acetate 2. 0 oil agent: lanolin 12.5 minutes n sentence oil
2.5 (Engineering, C, I, manufactured by JAPAN Co., Ltd.: Solsperse #13000) Volatile solvent: Ethyl acetate 30.0 Toluene 30.0 The above polyamide resin was dissolved in a mixed solvent of toluene/IPA = 2/1, A 35% polyamide resin solution was prepared, and using a rod coater, it was coated and dried on a film base material that had been surface-treated on both sides to form a polyamide resin layer <p Aa
) was formed. In addition, an ink liquid was prepared by dispersing the mixture of the above components in a ball mill for 12 hours, and a solution of vinyl chloride-vinyl acetate copolymer in methyl ethyl ketone was applied on the other film base surface, and heated at 70°C Dry to a thickness of 0. A 5 μm adhesive layer was provided, and an ink liquid was applied on the top layer using a rod coater, and the ink layer was formed by heating and drying at 100° C. for 2 minutes to obtain a film ribbon for impact printers as shown in Table 2.

Table-2 * For ArPA Niaramibifilm Example 2 and Example 3, A1 to
When A3 was evaluated, good results were obtained.

Comparative Example Using the ink liquids shown in Examples 1 and 3, film tubes for impact printers shown in Table 3 below were prepared as comparative examples in the same manner.

Note that the adhesive layer thickness was 1.0 μm.

Table 3 When these comparative examples were evaluated for AlA3 in the same manner as in Example 1, the following results were obtained.

(Comparative Example C-1.C-4: Wire wear amount D≧0
．． After continuous printing with a length of 10 mm, the print quality was extremely degraded.

(2) Comparative Examples C-2 and C-3: The printed dot diameter was widened relative to the wire bin diameter, so the advantages of the ultra-fine wire were not achieved, and especially for C-2, the printed dot diameter was the same as that of fabric ribbon. It happened.

Further, when the above-mentioned examples were similarly evaluated using a type printer, good results were obtained.

[Effects of the Invention] As described above, an impact printer comprising a film base material, an adhesive layer provided on the base material, and an ink layer containing a resin and an oil agent and a colorant that are poorly compatible with the resin. The film ribbon is characterized by having a 0.3 m to 5.0 m polyamide resin layer on the film base surface on which the ink layer is not formed, so that printing members that occur when using a normal film ribbon can be avoided. (Wire bin, printing hammer, etc.) It has the effect of minimizing wear and chipping at the tip, and can maintain good printing quality over a long period of time. Further, this effect is particularly noticeable when using a high-density head and an ultra-fine wire, and high T11, fine print dot diameter, and print clarity can be realized. Furthermore, by using the film ribbon of the present invention, high quality characters can be printed even on coarse paper such as Japanese paper.

that's all

Claims (1)

[Claims] A film ribbon for an impact printer comprising a film base material, an adhesive layer provided on the base material, and an ink layer containing a resin and an oil agent and a colorant that are poorly compatible with the resin, in which the ink layer is not formed. On the film base material side,
A film ribbon for impact printers, characterized by having a polyamide resin layer of 0.3 μm to 5.0 μm.