Typographic and lithographic drying oils. simple recipes

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FACTORY TECHNOLOGIES AT HOME - SIMPLE RECIPES
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Typographic and lithographic drying oils. Simple recipes and tips

Factory technologies - simple recipes

Directory / Factory technology at home - simple recipes

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Typographic and lithographic drying oils They are prepared from linseed oil and differ from ordinary ones in their thickness. Preferably old rancid linseed oil is used, which does not flake at a temperature of 270-300 °C.

First heat the oil to a temperature of 130 °C and maintain this temperature until the oil stops foaming (foam indicates the presence of water in the oil). The temperature is then gradually increased to 360-380 °C until the oil thickens. Depending on the properties and quantity of oil, as well as the heating temperature, the oil can be brought to the proper density in a relatively short time.

Drying oil is considered cooked when a sample taken between the fingers gives an oil thread of 3,5-4 cm. You can also judge the density by immersing a hydrometer in cooled oil. Lithographic drying oils are thicker than typographic ones. More liquid varieties of drying oil are prepared within 10-17 hours. Sometimes the oil is purified with sulfuric acid before cooking. For this purpose, the oil is heated to 100-120 °C to remove water, poured into a wooden or leaded vat and 100 kg of strong sulfuric acid is added for every 2 kg of oil, stirred well and left to stand for 3-4 hours.

Pure oil is drained from the sulfuric acid settled at the bottom and washed with water. The purified oil is subjected to further cooking, as mentioned above. Finished drying oils are passed in a warm state through a wire sieve. Flaxseed oil thickens much faster if cold or heated air is passed through it.

Printing and lithographic drying oils are brewed without driers. Light rosin, tar soap, distilled tar oil, raw linseed oil are added to the printing drying oil. All these impurities reduce the quality of drying oil and are used to reduce the cost of the product. For fine typographical work, pure drying oil is used. Resin soap should be considered a useful impurity, which facilitates the washing off of printing ink from the font. The drying oil should be so thick that the paint prepared on it does not give through greasy spots on the paper.

Composite typographic drying oils

Medium fortress

Linseed oil 6,5 kg;
Resin oil 12 kg;
Rosin 10 kg;
Thick turpentine 250 kg;
Resin soap 250 kg.

big fortress

Linseed oil 4,5 kg;
Resin oil 12 kg;
Rosin 10,5 kg;
Thick turpentine 250 g;
Resin soap 250 g.

These drying oils can be prepared in the following way.

Rosin is crushed into small pieces and melted in a cauldron with resin oil at a temperature of 130-130 °C. When the mixture becomes completely liquid, add linseed oil and the rest of the ingredients. The mixture is heated, maintaining a temperature of 130-150 °C for three hours to obtain a homogeneous drying oil and remove the smell of resin oil. To eliminate mechanical impurities, hot drying oil is filtered through a cloth.

The density of drying oil depends on the quantitative ratio of linseed oil, resin oil and rosin. Printing drying oil must be completely homogeneous, viscous and must have the ability to bind the paints used. Printing drying oil must not penetrate the paper and must dry without the use of drying agents within a certain time.

Composite typographic drying oils

1st recipe:

Linseed rancid oil 10 kg;
Resin oil 3 kg;
Soap shavings 500 g;
Drying oils 700 g.

2st recipe:

Linseed rancid oil 5 kg;
Resin 5 g;
Resin oil 3 g;
Drying oils 100 g.

First, the resin and resin are melted and soap chips are added, then the remaining impurities are added with stirring and heating.

Drying oil for printing inks

poor

Rosin 12,5 kg;
Condensed linseed oil 50 kg;
Resin soap 1,5 kg;
Drying oils 3,5 kg.

Average

Rosin 12,5 kg;
Condensed linseed oil 50 kg;
Resin soap 1,5 kg;
Drying oils 2 kg.

Strong

Rosin 12,5 kg;
Condensed linseed oil 50 kg;
Resin soap 1,5 kg.

The admixture of rosin can be brought up to 38,5 kg, but then you need to correspondingly increase the amount of tar soap and boiled linseed oil. In the manufacture, melted rosin, tar soap cut into small pieces and, after dissolving it, boiled linseed oil are added.

Author: Korolev V.A.

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