Offset Printing 1000 Questions (167-173)

167. What is the basic performance of resin-based fast-setting bright offset inks?

A: Resin type quick-setting bright offset ink is one of the commonly used high-grade 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: Resin in 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% to 27%, and the auxiliary material is 5% to 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.

168. In practical printing, what matters should be paid attention to when adjusting the compatibility of resin-based quick-setting bright offset printing inks?

A: This product under normal process conditions, in addition to the need for the original ink deployment or grinding, generally do not need to add accessories can be printed directly on the machine. If the conditions such as printing speed, ambient temperature and humidity, and paper quality change, and certain suitability needs to be adjusted, the designated auxiliary materials should be used. Otherwise, the structure of the original ink will be damaged, causing malfunction and causing losses. When making specific adjustments, attention should be paid to the following matters.
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 accordance with the color sequence; 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.

169. What is the application and composition of metal (gold, silver) offset inks?

A: Gold (or silver) ink supplied on the market will be supplied separately from gold powder (or silver paste) and linking material (transfer oil or silver oil), and will be prepared by the printing house itself. In recent years, some domestic manufacturers have made it available in a mixed state and can be directly printed on the machine. Metal (gold, silver) offset printing ink is mainly used for printing fine and luxurious publications and packaging paper products, trademarks, labels, etc., and is made of metal pigments, special binders and a certain amount of auxiliary materials, which are mixed and modulated. Among them, the metal pigment refers to gold powder, silver powder or silver paste, and the linking material refers to gold transfer oil (or silver oil), commonly used oil transfer varieties include 8914 offset gold, 981 gold, and 987 gold. Oil, 101 transfer oil, 46 transfer oil and 47 transfer oil.

170. In actual printing, what matters should be noted when deploying offset metal ink?

A: 1 According to the layout of the layout of the text, set the printing color sequence or printing times, in the process there is the use of secondary color overlay method; 2 if self-modulation, should be before printing, according to the formula metal pigments and binders Mix evenly, mix the amount of control should be used within 2 hours, with the use of distribution, otherwise it will be due to the preparation of time is too long, there is loss of light, black (dark) phenomenon; 3 in the printing process, such as drying is too slow, Can be Zhuojia red dry oil, should not be excessive use of white dry oil, otherwise it will affect the color; such as drying too fast, you can Zhuojia about 10% of dibutyl phthalate to control its dryness.

171. What is the basic performance of resin-based non-heat-set web offset inks?

A: 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% to 45%, dry vegetable oil is 15% to 20%, and mineral oil (ink oil) is 30% to 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: Non-heat-set rotary offset inks currently sold in the market include yellow ink, magenta ink, cyan ink, brown ink, and black ink, among which magenta ink is further 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.

172. What matters should be paid attention to in the actual application of resin type non-heat-set rotary offset printing ink?

A: Under the normal process conditions, the original ink can be directly printed on the machine, without adding accessories. If you must adjust the printability due to changing conditions, you should pay attention to the following matters.
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: In the case of thickening, with a reduced viscosity, the amount of ink 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.

173. What are the basic properties of resin-based thermoset web offset inks?

A: Resin type thermoset web offset printing inks are improved from thermoset type 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. It is mainly applicable to various multi-color double-sided high-speed web offset presses equipped with heaters and cooling rollers, which can be matched with offset printing coating papers, lightweight coating papers, and the like.

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