JPS63290786A - Film ribbon for impact printer - Google Patents

Abstract

PURPOSE:To prevent a film blank material from being deteriorated by wire pins and realize high printing quality, by using as a film base a specified biaxially stretched polyamide resin film having a specified thickness. CONSTITUTION:A film ribbon for use on an impact printer comprises a film base, on which are provided an adhesive layer and an ink layer comprising a resin, an oil agent poorly compatible with the resin and a coloring agent. The film base is a biaxially stretched film of a polyamide resin of formula I or II, wherein m1 is 4 or 6, m2 is 5 or 11, and n is a polymerization degree, the thickness of the film being 5.0-25.0 mum. By this method it is possible to realize high printing quality, such as print dot diameter and clearness of prints, corresponding directly to a marked reduction in the diameter of wire pins of a dot head or an increase in the number of the pins. Besides, bending or breakage of the film base, breakage of the wire pin or the like is prevented from occuring when the same part of the ribbon is struck for printing a small number of times.

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, which is used as a multi-strike type or overstrike type, and has a sponge-structured ink layer.

[Prior Art] Impact printers, especially wire dot printers, are one of the printers that are currently used in large numbers as peripheral terminals for office computers and word processors. Its advantages include ■ Simultaneous copying ability ■ Printing speed ■ Low cost, etc. However, on the other hand, its disadvantage is low printing quality, which could be improved.

Regarding printing quality, attention has been particularly focused on the recent advent of high-printing quality printers, such as laser printers and liquid crystal printers.As for the fabric ribbons and film ribbons currently in use, the sharpness of printed characters is In some cases, the diameter of the printed dots is too large, or in the latter case, although the characters are clear, the diameter of the printed dots is widened. In addition, the latter is mainly used as a pancake type, but due to the influence of the film material etc., its advantages are not fully utilized.
As shown in 8182, attempts have been made to consider the material and improve the clarity of the characters. No clear effect has been found to suppress the expansion of the diameter.

In addition, for the future, wire dot printers as well.
There is a movement toward ultra-thin wire pin diameters for wire dot heads and multi-bins with 24 or more wire bins, and the film ribbons for impact printers that have traditionally been used are no longer compatible with this. No attempt has been made to create a film ribbon for impact printers that accommodates such movements.

[Problems to be Solved by the Invention] The present invention solves the above-mentioned trend of ultra-thin wire pin diameters of wire dot heads in wire dot printers and increase in the number of wire pins to 24 or more, which cannot be solved by conventional technology. The problem is that the outline of the printed characters is unclear and the diameter of the printed dots is widened.
It also solves the problem of the ribbon being partially bent by hitting the same spot several times, or in extreme cases, the wire bin breaking through, making printing impossible and also causing the wire bin to break. The purpose of this is to suppress the deterioration of the film material caused by wire bins, to achieve a printing dot diameter with good reproducibility relative to the wire pin diameter, and to achieve high printing quality using an impact dot printer with a large number of bins (24 or more bins) using ultra-fine wire bins. The purpose of the present invention is to provide a film ribbon for impact printers to achieve this goal.

[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 the film ribbon for impact printers, the film substrate has the general formula; Any of the biaxially stretched polyamide resin films shown above is characterized in that its thickness is 5.0 μm to 25.0 μm.

Here, the polyamide resin films represented by the above general formulas [A] and [B] can be synthesized by known synthesis methods, such as condensation polymerization of dimer acid and polyamine, ring-opening polymerization of lactam, etc. It can be obtained by biaxially stretching to a desired thickness to form a film.

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, styrene-methyl methacrylate copolymer, polyvinyl butyral, polyurethane, polyvinyl alcohol,
Using a material selected from methyl cellulose, ethyl cellulose, etc., this resin is mixed and dissolved with a volatile solvent, and then a dispersion of an oil agent and a coloring agent that are poorly compatible with the resin is milled in a ball mill, sand mill, grain mill, etc. It can be produced by mixing and dispersing the mixture in a fractionator, applying it onto a film base material or an adhesive layer of a film base coated with an adhesive layer using a coater, a wire bar, a doctor blade, etc., and drying the mixture.

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 μm to 21.0 μm, more preferably 5.0 μm to 17.0 μm, even more preferably 10.0 μm to 17.0 μm. The thickness of the adhesive layer between the film base material and the ink layer is 2.0 μm.
It is preferable that it is below.

As the film base material, a biaxially stretched polyamide resin film selected from the above general formula, [A], and [B] can be used.

Specifically, No. 1: (Common name: Nylon 46) No. 2: (Common name: Nylon 66) No. 3: (Common name: Nylon 6) No. 4: (Common name: Nylon 12) ÷ NH-(CI+2?, -+-, and the thickness thereof is preferably 5.0 μm to 25.0 μm, more preferably 5.0 μm to 21.0 μm.
μm, more preferably 5.0 μm to 15°0 μm. In addition, these are treated with appropriate surface treatments (corona treatment,
General surface treatments such as plasma treatment and UV treatment) may also be applied.

If the thickness of the film base material were to be thinner than 5.0 μm, the durability of the film against the pressure of the wire bin during printing would be poor, and significant bending or tearing of the film would occur even after a low number of printings. On the other hand, if it is thicker than 25.0 μm, the print quality will be affected, such as the print dot diameter becoming wider.

Regarding the thickness of the ink layer, if it is thinner than 5.0 μm, the initial print density will be low, and if it is thicker than 21.0 μm, the print quality will deteriorate, such as the print dot diameter widening and the sharpness of the character outline decreasing due to blurring. The impact of this will occur.

As described above, it is possible to obtain the desired printed dot diameter for the diameter and number of wire bins used without significant deterioration of the film base material.

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

Example 1 Ingredients Parts by weight Colorant Two Carbon black 7. 0 Alkaline Blue 5.0 Resin: Vinyl chloride-vinyl acetate copolymer 14.0 (Deki Kagaku Co., Ltd.: Denkavinyl #1000LT3) Oil agent: Liquid paraffin 14.0 (Nippon Oil Co., Ltd.: K-230) ) Dispersion oil 4. 0(1,C,・1
．． JAPAN Co., Ltd.: Solsbirds #17000) Volatile solvent: Toluene 28.0 Methyl ethyl ketone 28.0 A mixture of the above components was dispersed in a sand mill for 12 hours to prepare an ink liquid, and a 5.0 μm thick ink solution was prepared. 1
This ink liquid was applied onto the corona-treated surface of the polyamide resin film using a rod coater and heated at 100"C for 2 hours.
The film was dried by heating for a minute to obtain a film ribbon for an impact printer with an ink layer thickness of 17.0 μm.

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

(A1) Printing dot diameter (dot reproducibility): The required printing dot diameter (dot reproducibility) for the wire pin diameter (W) shown below.
d), w=0.20mm: d≦0.25mm: 0.15
: d≦0.20 wise=o, xo : d≦
0 and 15, when the actual dot diameters for each wire bin were measured, they all met the requirements.

(A2) Print density (PC8 density): 0 for pure white, 1 for pure black
．． PC8 value of index indicating 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-
n) was used.

(A3) Film durability: When the same location was printed 10 times, tearing, curvature, etc. of the film were determined from a printed sample and visual inspection, and no problems were found.

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

Example 2 A methyl ethyl ketone solution of a styrene-butadiene copolymer was coated and dried by heating at 80"C, and then an adhesive layer of 1°0 μm was formed on the film base material exemplified in the specification.
The ink liquid prepared in 1 was applied using a wire parser and dried by heating at 120°C for 2 minutes to obtain a film ribbon for an impact printer shown in Table 1.

Table 1 Example 3 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 #1000LT3) Polyvinyl acetate 2.0 Oil agent: Lanolin 12.5 Dispersion oil
2.5 (1, C, 1, manufactured by JAPAN Co., Ltd.: Sols Bars #
13000) Volatile solvent: Ethyl acetate 30.0 Toluene 30.0 The mixture of the above components was dispersed in a ball mill for 12 hours, and then an ink liquid was prepared.

On the other hand, a methyl ethyl ketone solution of vinyl chloride-vinyl acetate copolymer was applied onto the surface-treated film base film exemplified in the specification, and dried by heating at 70°C to a thickness of 0.5 μm.
The above ink liquid was applied using a rod coater, and the ink layer was formed by heating and drying at 100°C for 2 minutes.
A film ribbon for an impact printer shown in No. 2 was obtained.

Table 2 For Examples 2 and 3, A1 to 3 are similar to Example 1.
When A3 was evaluated, good results were obtained.

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

Note that the adhesive layer thickness was 1.0 μm. A fabric ribbon (Fabric) is also shown for comparison.

Table-3 * PP: Ho 1 Noah 0 Rohi 0 Ren film PET: Ho 0 Liethylene Tele 7 Talate film Regarding these comparative examples, A1 to A3 were evaluated in the same manner as in Example 1, and the following results were obtained. Obtained.

[Effects of the Invention] As described above, an impact printer plate 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 the film ribbon for use, the film substrate has the general formula; 1NH-(CH2), 7? , ± --- [B1 (however,
In the above general formula, m1=4 or 6, m2=5 or 11
, n indicates the degree of polymerization), and the thickness thereof is from 5.0 μm to 25.0 μm.
0 μm, it has features such as ultra-fine dot head wire pins, printing dot diameter that can be easily adapted to increased number of pins, and printing clarity that could not be achieved with conventional film ribbons for impact printers. High print quality can be achieved. In addition, by using a polyamide resin film as the film base material, the curvature of the film ribbon base material when hitting the same location with a low number of prints, which occurs when using a film ribbon based on polyester or polypropylene, can be avoided. In addition to solving problems such as tearing and wire pin bending, it has the effect of extremely minimizing the wear of the wire material due to contact between the film base material and the wire pin, and the resulting deterioration of print quality and print life. This problem can also be solved, and the life of the dot head can be extended. 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)

[Scope of Claim] 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 coloring agent that are poorly compatible with the resin. The base material is a general formula; ▲There are mathematical formulas, chemical formulas, tables, etc.▼...[A] or ▲There are mathematical formulas, chemical formulas, tables, etc.▼...[B] (However, in the general formula above, m_1=4 or 6, m_2=
5 or 11, n indicates the degree of polymerization), and the thickness thereof is 5.0 μm to 25.0 μm.
A film ribbon for impact printers characterized by μm.