What is the difference between metallic ink and ordinary ink?

Metallic inks refer to the use of tiny metal flakes instead of pigments or dyes in traditional inks.

Formulated inks with a unique metallic shiny effect. The often said metallic inks mainly refer to silver ink and gold ink. Silver ink is formulated from aluminum pigments; Gold ink is generally formulated from copper pigment and zinc pigment in different proportions, and by controlling and changing their ratio, it is possible to produce lapis gold, green and red gold, red gold ink or the required pantone metallic ink.

Because the optical properties of metal pigments are different from those of ordinary pigments, the optical properties of the metal inks produced are also very different from those of ordinary inks. The color of ordinary inks does not change with the change of viewing angle, whereas in the case of metallic inks, the change of viewing angle changes the hue of the metallic ink.

and brightness. Due to the high density of metal pigments, so compared with ordinary ink, the pigment particles of metal ink are very easy to precipitate, before using must be fully stirred, before printing on the machine to check whether there is sediment at the bottom of the ink barrel, if the stirring is uneven, the hue and gloss of the printed matter.

The difference is quite large. In order to ensure the stability and good fluidity and transferability of metal ink, the viscosity of the ink should be measured regularly and the solvent should be added appropriately to keep the viscosity of the ink in a stable range. Many printers often achieve a colored metallic effect by adding color paste or toner to metallic inks.

It should be noted that due to the particularity of metallic pigments, some colorants or toners may thicken the ink or change its properties, so be sure to test it before use.

The resin in metallic inks needs to be irradiated with UV light at a specific wavelength band to dry, while ordinary inks do not need to be irradiated with UV light. The drying principle of ordinary ink is oxidation, penetration, and solvent volatilization in the ink, which all require a long time, and it takes nearly 20 hours to dry when printing with ninety percent screen ordinary offset printing ink. The metallic ink is an ultraviolet-curing solvent-free ink, and its drying principle is the same as that of metal varnish, and the photosensitive material accepts ultraviolet photons to initiate the polymerization photochemical reaction of prepolymers and diluents.

The reaction time is very short, approximately, after the reaction forms a cured ink film. There are no volatile and permeable substances during the reaction. It is characterized by fast drying, good gloss of the film and friction resistance, but it is relatively higher.

Since the substances used to make metallic inks are all active metal materials, the chemical properties of metallic inks are also very unstable, and they should be strictly sealed during use and storage to avoid absorbing too much water and being directly exposed to light for a long time. In lithography, the use of an inappropriate dampening solution can also greatly affect its sparkling effect. In addition, the density of metal pigments is large, so compared with ordinary ink, the pigment particles of metal ink are very easy to precipitate, if there is no sufficient stirring before use, and there is no precipitate at the bottom of the ink barrel before printing, the hue and gloss of the printed matter are quite different.

In order to ensure the stability and good fluidity and transferability of metal ink, the viscosity of the ink should be measured regularly and the solvent should be added appropriately to keep the viscosity of the ink in a stable state.

The main components of inks are binders (resins), pigments, fillers, additives and solvents.

The ink consists of a primary and auxiliary component, which are homogeneously mixed and repeatedly rolled to form a viscous gelatinous fluid. It is composed of binders (resins), pigments, fillers, additives and solvents. It is used for books, packaging and decoration, architectural decoration and electronic circuit boards.

and other kinds of printing. With the increase of social demand, the variety and output of inks have also expanded and increased accordingly.

Features of the ink:

For ink, color, body bone (usually the rheological properties of ink such as consistency and fluidity are called the body bone of ink) and drying performance are the three most important properties of ink, and they should also be paid attention to when developing ink formulas and processes and producing inks; The film on the printed matter should have a certain resistance to make the printed product have practical use.

Mastering the deployment of spot color ink, the control of ink consumption, and the full use of residual ink can not only save materials, but also improve personal quality and technical level. An excellent ink blender plays a very important role in the development of new inks, color innovation, and the reduction of ink costs.

Ink is an important material used for packaging material printing, it is printed to express the pattern and text on the substrate, the ink includes the main components and auxiliary components, they are evenly mixed and repeatedly rolled into a viscous gelatinous fluid.

The use is great, and many things will have no color without ink.

It is used for various printing of books, packaging and decoration, architectural decoration and electronic circuit boards.

Main ingredients:

1) Pigments (including pigments and dyes): pigments can give different colors and color concentrations to the ink, and make the ink have a certain viscosity and dryness.

2) Connecting material: The ink forms a uniform thin layer after printing, and forms a film layer with a certain strength after drying, and protects the pigment and makes it difficult to fall off.

2) Thinner: reduce the viscosity of the ink, prevent the phenomenon of film peeling, and make the ink workable.

3) Anti-skin agent: inhibits the drying speed of the ink and prevents the ink from drying the conjunctiva mechanically.

4) Anti-anti-anti-printing agent: prevent the printing ink layer from being backprinted on the back of the paper to ensure the printing quality.

5) Slip agent: improve the friction resistance and fluidity of the ink, and reduce the viscosity.

6) Other additives: such as dispersants, wetters, desiccants, etc.

The main agent and the additives of the ink raw material powder are divided into: 1Pigment 2

The raw materials of the connecting material are: organic pigments, lake pigments, inorganic pigment connecting materials: oil-type binders, resin-type binders, inorganic, organic solvent additives

1.Drying Conditioner 2Tone adjusters and drying adjusters are:

Desiccant, desiccant inhibitor.

Tone adjusters include: dilution, color enhancer.

Pigment is a solid component in ink, which is the chromogenic substance of ink, and is generally a pigment that is not tolerant of water. The saturation, tinting strength, transparency and other properties of the ink color are closely related to the performance of the pigment.

The binder is the liquid component of the ink, and the pigment is the carrier. In the printing process, the binder carries the pigment particles, which are transferred from the ink half of the printing press to the substrate through the ink roller, the printing plate, and the substrate to form an ink film, which is fixed, dried and adhered to the substrate. The gloss, dryness, mechanical strength and other properties of the ink film are related to the properties of the binder.

The additives added to the ink are to improve the printability of the ink, such as: viscosity, adhesion, dryness, etc.

1.Pigments.

Pigments include pigments and dyes. Pigments can give different colors and concentrations to inks, and make inks have a certain viscosity and dryness, and commonly used are azo and phthalocyanine pigments.

2.Coupling material.

The binder is made of a small amount of natural resin, synthetic resin, cellulose, rubber derivatives, etc. dissolved in dry oil or solvent, it has a certain fluidity, so that the ink forms a uniform thin layer after printing, and forms a film layer with a certain strength after drying, and protects the pigment, making it difficult to fall off.