CN1009722B - Thermo-ribbon for typewriting - Google Patents

Abstract

The present invention relates to a recipe for a color ribbon used by a non-striking temperature sensitive electronic typewriter. The color ribbon manufactured by the recipe has the advantages of high thermal transfer sensitivity, clear transferred characters, great contrast, chemical mediator resistance and simple manufacture process. The color ribbon uses an ordinary two-direction stretch polyester film as a base layer, an ink layer is composed of polyamide resin or natural asphalt with a small soft melting range and carbon black with both electric conduction function and coloring function, the color is manufactured by special scratching equipment, and the color ribbon can also be used for various kinds of non-striking temperature sensitive recording equipment.

Description

Thermo-ribbon for typewriting

The present invention discloses a kind of prescription and coating method that is used for the thermal print ribbons China ink layer of non-beating type electronic typewriter.

Traditional typewriting is with mechanical strike mode the printing ink on braid over braid or the plastics colour band to be transferred on the paper.This method noise is big, and character is jagged, and the color and luster contrast is unsuitable for depositing retaining for a short time.In order to solve the shortcoming of mechanical printing, hot print has appearred again, and wherein a kind of method is by the dot matrix thermal head on the non-beating type electronic printer, and the China ink layer on the thermal-printing thin film is transferred on the paper.This method noise is little, easy to operate, and character does not have burr, and the color and luster contrast is big, and the material of printing is convenient to duplicate, photomechanical production, and can long preservation.

Thermal print ribbons is generally formed (JP-49/38629) by basic unit, conductive layer and China ink layer, owing to will be in basic unit coated two-layer, so the manufacturing process more complicated.Occur a kind of only thermal-printing thin film (GB2099602) of coated one deck China ink layer in basic unit subsequently again, simplified the production technology of thermal-printing thin film greatly.The main component of thermal-printing thin film China ink layer is a thermoplastic resin, is that melt region is narrow for the requirement of resin, and fusing back viscosity is little.The thermoplastic resin that common thermal-printing thin film adopted is: the poly-propionic ester of polyurethanes, polyvinyl acetal resin, Tissuemat E and modification etc.

The present invention seeks to propose a kind of prescription of new thermal print ribbons China ink layer.

The prescription and the coating method that use the present invention to propose are made thermal print ribbons, have the good and advantage of simple technology of low, the hot transfer characteristic of cost of material.

Fig. 1. the sectional view of thermal print ribbons, [1] they are base material, and [2] are the China ink layer.

Fig. 2. colour band coating schematic diagram, [3] base material, [4] ink fountain, [5] wiping axle, [6] heating plate, [7] colour band.

Thermal print ribbons of the present invention is made up of basic unit [1] and the superincumbent one deck China ink layer of coated [2]. Basic unit [1] can adopt common biaxially oriented polyester film, and thickness is 3-6 μ m. Its China ink layer [2] is made up of resin, surfactant, flux material, conductive material and pigment. Wherein Main Ingredients and Appearance is resin, accounts for 30-60%, and used resin material is polyamide and polyether resin or bitumen. Resin material also can adopt polyethylene glycol, SBS resin and acetylbutyrylcellulose etc. The softening point of these resins is 60～150 ℃, and the melting range scope is little, and result of use is good. Surfactant can adopt quaternary amine type anion surfactant, phosphate type anion surfactant and nonionic surface active agent. Flux material can adopt triphenyl phosphate, rosin, polypropylene glycol, camphor and paraffin etc. Conductive material can adopt carbon black, graphite and metal dust. Pigment can adopt carbon black or spirit black.

Composition and the weight proportion of thermal print ribbons China ink layer of the present invention are:

Resin 30-60%

Flux material 5-20%

Surfactant 2-10%

Conductive material 10-30%

Pigment 5-20%

Add the 50-70% solvent after above-mentioned material mixes, put into ball grinder, add the steel ball (be raw material 50～200%) of φ 10～φ 50,, just make the printing ink that is coated with usefulness with 30～200 rev/mins rotating speed ball millings 3～10 hours.

The above-mentioned printing ink for preparing is poured in the ink fountain [4] of special-purpose coating machine, wiping axle [5] with printing ink equably blade coating in basic unit, through Far-infrared Heating plate [6] heating, drying remove desolvate after, be wound into ribbon spool [7].Cut into the colour band of certain specification on request with cutting machine.

Various compositions and optimal proportion in the thermal print ribbons China ink layer of the present invention are as follows:

Example 1: polyamide 35%

Polyether resin 10%

Sapn 13%

Phosphate ammonium salt 10%

Carbon black 32%

Example 2: polyamide 43%

Triphenyl phosphate 8%

Castor oil acid 7%

18 triglyceride 6%

Carbon black 36%

Example 3: bitumen 45%

Paraffin 22%

Carbon black 33%

The thermal-printing thin film of manufacturing of the present invention has sensitive heat and shifts character, hot transfer velocity＜0.1 second.Its black layer resistivity is 1 * 10 ⁴～1 * 10 ⁸Ω cm, China ink layer heat transfer rate＞80%.The character of printing with the thermal print ribbons of manufacturing of the present invention can stand-40 ℃～+ 50 ℃ the humid test and the soak test of diluted acid, sig water and hydrogen peroxide etc.

Claims (3)

1, a kind of thermal print ribbons of being formed by basic unit [1] and China ink layer [2], the China ink layer [2] of colour band is made up of resin, surfactant, flux material, conductive material and pigment, wherein Main Ingredients and Appearance is a resin, it is characterized in that used resin material is the hybrid resin of polyamide and polyether resin or polyamide and bitumen composition, the composition and the weight proportion of China ink layer [2] are:

Resin 30-60%

Flux material 5-20%

Surfactant 2-10%

Conductive material 10-30%

Pigment 5-20%

2, thermal print ribbons according to claim 1 is characterized in that various compositions and the optimal proportion in the China ink layer [2] is:

Polyamide 35%

Polyether resin 10%

Sapn 13%

Phosphate ammonium salt 10%

Carbon black 32%

3, thermal print ribbons according to claim 1 is characterized in that various compositions and the optimal proportion in the China ink layer [2] is:

Polyamide 43%

Triphenyl phosphate 8%

Castor oil acid 7%

18 triglyceride 6%

Carbon black 36%

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