How to use ink in printing process

In actual use of ink, the physical and chemical properties and printability of the original ink may be unsuitable due to the differences in the type and nature of the paper used, the printing process, and the technical conditions of the workshop process, or different concentrations and tones may be required. The color or complex color ink. Auxiliaries added to meet and adapt to these process conditions and requirements in the actual printing process are called ink accessories. Commonly used offset printing ink accessories are consistency modifiers, viscosity modifiers, dryness modifiers, dilutants, and the like.

Resin type thermosetting web offset printing inks are improved from thermosetting rotary printing inks. They consist of pigments, resin-based thermosetting binders and modifiers. It is mainly used to print colored newspapers, magazines, advertisements, catalogues, travel brochures, telephone directories, etc. In the drying process, the solvent volatilizes and both of them are infiltrated. At present, there are HS-24 yellow, HS-16 pink, HS-33 sky blue, HS-51 black and other varieties. Mainly applied to heaters. A variety of multi-color double-sided high-speed web offset presses for cooling rollers can be used with offset printing coating papers, lightweight coating papers, and the like.

Resin type non-heat-set web offset printing ink is also called resin type cold-set web offset printing ink. It is mainly used for printing colored newspapers, magazines, publications, and other publications.
Composition: resin is 35%-45%, dry vegetable oil is 15%-2D%, and mineral oil (ink oil) is 30%-40%. The pigments and fillers in the ink are all 15% to 25%, and the rest are accessories.
Characteristics: It has general color performance and coloring density, and it has good print job adaptability and dot reproducibility. The ink film color, gloss and anti-friction are good.
Drying type: mainly osmotic drying.
Varieties: The non-heat-set web offset printing inks currently on the market have yellow ink. Magenta ink, blue ink, brown ink, and black ink, among which magenta ink is divided into golden red and dark red.
Printability: For high-speed web offset presses that can be used with non-coated papers such as newsprint, book and paper, and letterpress paper.

Under the normal process conditions, the original ink can be directly printed on the machine, without the need to add accessories. In the practical application of resin type non-heat-set web offset printing ink, the following matters should be noted.
Consistency: When reducing viscosity, a small amount of designated diluent or mineral oil may be added as appropriate, and the amount should be controlled within 3%.
Viscosity: At the time of thickening, accompanied by viscosity reduction, the amount of mooring oil should be controlled at 1% to 3%.
Dryness: The original ink is osmotic drying type, so it does not need to add driers.
Color Matching: The original ink of this product can be used as the inter-color or multi-color ink, and it can also be used as the light-colored ink with the designated light-reducing agent. However, other types of color inks must not be used for compounding. If there are special needs, special ink can be ordered from the relevant manufacturers.

Under the normal process conditions, in addition to the need to mix or grind the original ink, generally do not need to add accessories can be printed directly on the machine. If printing speed, ambient temperature and humidity. When conditions such as paper quality change, and certain suitability needs to be adjusted, the designated auxiliary materials shall be used. Otherwise, the structure of the original ink will be damaged, causing malfunction and causing losses. In the actual printing, when adjusting the compatibility of the resin type quick-setting bright offset printing ink, attention should be paid to:
Consistency: When it is thickened, use No. 6 resin varnish or thinner; when thickening, thick resin varnish can be used. Thickening and thickening are accompanied by viscosity reduction and viscosity increase, respectively. Attention should be paid to the control of dosage.
Viscosity: If the consistency is appropriate and the viscosity needs to be reduced, the relieving agent should be added in an appropriate amount, generally not more than 5%.
Dryness: If dryness is affected by factors such as paper or wetting liquid acidity, white dry oil can be added, but it should be determined in order of color; if printed in monochrome or in the last color, it can also be added in red oil. .
Concentrated color matching: Use this product with the same series of color ink to mix into color ink or complex ink.
Light-tune color: Use fader or bright light to mix light-colored or complex-colored ink. It is not suitable to use white oil or transparent dilute ink, otherwise it will destroy the structure characteristics of the original ink.

Resin type fast-setting light offset ink is one of the most popular discretionary offset inks.
Uses: mainly for printing color magazines, pictures, advertising brochures, high-grade packaging paper products, trademarks, such as the use of mesh-based or field-based color printing.
Composition: The resin content of the binder is 26% to 32%, dry vegetable oil is 19% to 26%, and mineral oil (ink oil) is 30% to 40%. The pigment in the ink is 15%-27%, and the auxiliary material is 5%-17%.
Features: Excellent color performance, high coloring density, colorful, pure, excellent printability and dot reproducibility, rapid drying, high gloss, good ink film resistance and rubbing resistance .
Drying type: Mainly infiltration gelation, both oxidative polymerization.
Variety: Common resin-based fast-setting light offset inks include yellow ink, magenta ink, blue ink, and black ink. Among them, yellow ink is divided into lemon yellow, yellow, transparent yellow, dark yellow and orange, etc.; red ink is divided into pink, gold, red and dark red; blue ink is divided into blue, peacock blue, Blue and sky blue and so on.
Printability: It is mainly suitable for sheet-fed four-color (or five-color) offset printing machines with a printing speed of 10,000 rpm or less, and offset printing coated paper, high-gloss printing coating paper, glass cardboard, embossed coated paper, etc. Advanced offset printing paper matching use.

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