JPS6271693A - Multicolor ink ribbon - Google Patents

Abstract

PURPOSE:To assure satisfactory printing performance with adjoining liquid inks not being mixed and not absorbing moisture in the air by providing the vehicle of each liquid ink consisting of water-insoluble oil, the oil of one vehicle having non-compatibility or retarded compatibility with the oil of the other vehicle. CONSTITUTION:A cloth ribbon base is a material which is plain-woven with nylon fiber of polyester fiber or cotton or silk fiber. Liquid ink impregnated into these bases are composed of a coloring agent and a vehicle. A coloring agent used is of single ingredient type, i.e. either of various organic pigments, inorganic pigments or dyes, or a mixture of more than one kinds of these materials. The vehicle is made up of liquid oil at normal temperatures with the addition of any proper surfactant, if required. The oil has a viscosity of 5-100 poises (value obtained by the Rodvisco viscosimeter) at normal temperature, and each different type of oil used is a monoingredient oil having non- compatible or retarded mutual compatible solubility.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a multicolor ink ribbon. More specifically, it relates to a multicolor ink ribbon used in impact printing devices such as computer printers and typewriters.

``Prior art'' As a conventional multicolor ink ribbon, the Japanese Patent Publication No. 43-1487
There is one shown in No. 0. In the prior art, one of the liquid inks impregnated adjacently into a cloth ribbon base material is composed of hydrophilic polyhydric alcohols, linear polyethers, etc., and the other ink is impregnated with the other ink. The vehicle is made of oil and fat to prevent adjacent inks from mixing with each other.

[Problems to be Solved by the Invention] However, with this configuration, the hydrophilic vehicle absorbs moisture in the air and condenses on the ribbon surface, resulting in unfavorable print quality such as bleeding. There is.

[Means for Solving the Problems] In order to solve such problems, the present invention provides that the vehicles of each of the liquid inks are both made of water-insoluble oil, and the oil of one vehicle is the same as that of the other vehicle. It adopts a structure that is incompatible or poorly compatible with oil.

[Operations and Effects of the Invention] Due to the above structure, in the present invention, adjacent liquid inks do not mix, and neither ink absorbs moisture in the air, and good printing performance is achieved. can be secured.

[Example] Next, the present invention will be specifically explained.

The cloth ribbon base material used in the present invention is a plain weave of nylon fibers, polyester fibers, cotton fibers, or silk fibers, and is not a conventional ink material.

It is no different from Clipon. The liquid ink impregnated into these base materials is composed of a colorant and a vehicle, and the colorant includes various organic pigments, inorganic pigments,
Dyes and the like can be used alone or in combination of two or more.

The vehicle consists of an oil that is liquid at room temperature, and a suitable surfactant may be added as necessary.

The oil used is one type of oil that has a viscosity of 5 to 100 voids at room temperature (as measured by a Rhodovisco viscometer) and is mutually incompatible or poorly compatible.

Table 1 shows combinations of these incompatible or poorly compatible oils.

The oils in Group A and Group B in Table 1 are a mutually incompatible combination. Note that since those in the X- group are mutually compatible, oils in the same group may be mixed and used as a vehicle for the X- group.

Table 1 In addition to what is shown in Table 1 above, trimethylolpropane monooleate is poorly compatible with the above-mentioned blown rapeseed oil, but is compatible with blown castor oil.

Further, sorbitan monocaprylate is incompatible with the mineral oil, but compatible with liquid lecithin.

Theoretically, the compatibility and incompatibility of these oils is due to the difference in solubility parameter (sp), but since SP theory cannot always clearly clarify compatibility and incompatibility, it is difficult to carry out the present invention. At this time, two or more different oils were placed in the same beaker, mixed once, allowed to stand, and whether the mixed oils were separated or not was determined to determine whether they were compatible or incompatible. The above-mentioned relationship of compatibility and incompatibility is the result confirmed by such an experiment.

Next, the present invention will be explained with reference to Examples. In the following, parts are parts by weight.

Example 1 Four color inks, yellow ink (Iy), cyan ink (Ic), magenta ink (Im), and black ink (Ib), were applied to one nylon fiber base fabric (2
) was impregnated in stripes to form a ribbon (1). Table 2 shows the components and physical properties of each ink.

Margins below E] The four-color ink ribbon thus prepared was attached to an impact dot printer JP-80 manufactured by Epson ■ and used, but no color mixing occurred. I also left it in a room at 45 degrees Celsius and 95% humidity for 96 hours, but there was no moisture absorption and the pattern was printed well.

Example 2 Ink ribbons of four colors were produced in the same manner as in Example 1, except that the inks shown in Table 3 were used as inks in Example 1.

[Margin below] Tests were conducted in the same manner as in Example 1 using the above ink ribbon, and both the color mixing prevention property and the product's high-humidity durability were good.

When changing the order of colors in the ink ribbons of Examples 1 and 2, the order of the vehicles remains the same;
Just change the order of the colorants.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a multicolor ink ribbon according to an embodiment of the present invention. (Main symbols on the drawing) 1:? ! Colored ink ribbon 2: Nylon fiber base fabric

Claims (1)

[Claims] 1 A multicolor ink ribbon formed by impregnating a fabric ribbon base material with liquid inks colored in different colors adjacent to each other, wherein the vehicle of each of the liquid inks is composed of an oil insoluble in water, and one of the liquid inks is made of a water-insoluble oil. A multicolor ink ribbon in which the oil in one vehicle is incompatible or poorly compatible with the oil in the other vehicle.