Screen printing 1000 questions (235-249)

235. What are the uses of printing ink?
Answer: Ink printing ink is also called metal offset printing ink. It can be used for screen printing after diluted preparation. It is also called thermosetting metal screen printing ink and belongs to solvent type ink. It is widely used for printing various metal packaging containers, such as candy boxes, tea boxes, beverage cans and three-piece cans.

236. What are the characteristics of Indian iron ink?
A: In addition to the characteristics of general printing inks, such as viscosity and fluidity, printing inks should also have heat resistance, processability, solvent resistance, resistance to boiling water, steam sterilization, and corrosion resistance.

237. What are the raw materials for printing ink?
A: The printing ink consists of pigments, binders and ink additives.

238. What are the ingredients used to make the printing ink?
A: The printing ink binder is mainly composed of solvent and synthetic resin.

239. What are the main types of resins used in printing inks?
A: Mainly used for printing inks

The strength of adhesion between iron, so deep-drawn products, often in the printing ink before coating a layer of colorless and transparent primer, in order to facilitate the printing iron ink firmly attached to the surface of the iron.

240. What are the characteristics and main components of alkyd resin?
A: The main components of alkyd resins are polyols, polyacids, and fatty acid ester compounds. Polyols, such as glycerin, can be used to make alkyd resins; polybasic acids, such as phthalic anhydride (phthalic anhydride), dibasic acids, are widely used to make various types of alkyds, which are characterized by easy sublimation.

241. What is amino resin? What role does it play in ink?
A: Amino resin refers to a type of resin that can be dissolved in an organic solvent, such as melamine formaldehyde resin, urea formaldehyde, which is obtained by condensing a certain amino functional raw material with aldehydes (mainly formaldehyde) and then etherifying the alcohols. Resin, hexamethylol melamine resin, etc. The amino resin can accelerate curing in the ink and increase the hardness and gloss of the film.

242. What is epoxy resin? What are the main features?
A: Epoxy resin is a polymer compound containing epoxy groups. It is a linear molecular structure and is a thermoplastic resin. Its structure contains hydroxyl groups and epoxy groups. This reactive functional group can occur with many synthetic resins or compounds. reaction. Epoxy resin has excellent adhesion to metal, good thermosetting property, excellent chemical resistance, easy cross-linked curing with other resins, and fast curing.

243. What is the drying mechanism of the thermosetting acrylic resin binder?
A: Acrylic resin binders are commonly used binders for iron printing inks. Their drying mechanism depends on the active functional groups on the side chains, self-crosslinking by heating, or adding other resins (or monomers) such as amino resins and epoxy resins. The cross-linked net-like polymer compound is used to increase the drying property of the binder.

244. Why does Tinplate paint underneath before printing graphics?
A: The surface of tinplate generally has a layer of oil and oxide film. Its role is to protect the surface of the material. However, due to its existence, it will affect the printing ink and Makou

245. What resins are commonly used for printing iron primers?
A: The main role of the printing iron primer is to improve the adhesion of the ink on the surface of the iron sheet; at the same time, the film is required to have excellent flexibility to meet the processing needs; the color is light and light yellow; the solvent volatilization rate is appropriate; the leveling property is good . The most commonly used primer materials in China are epoxy resin and alkyd resin.

246. High temperature resistant iron white ink formula is what?
A: The composition of Yintie white ink is as follows: (Unit: kg)
Coconut oil alkyd 64
6101 Epoxy Resin 12
R820 titanium dioxide 100
Whole color paste 0.09
080 amino resin 24

247. Peacock blue iron ink formula is what?
A: The peacock blue ink printing ink formula is as follows: (Unit: kg)
Alkyd 22
Phenolic resin A (high viscosity) 39
Phenolic B (low viscosity) 10
Gel oil 7
Caustic calcium 2
Indigo Blue 18
Green 2

248. What is the role of varnish oil in printing ink?
A: The varnish is the last coating process of the iron printing process. Its role is to protect the printed pattern and prevent mechanical damage to the surface, while giving the printed pattern a higher gloss, increasing the appearance and increasing the value of the product. For the canned brand, the varnish also plays a role in preventing discoloration of the pattern when the cans are sterilized by high temperatures.

249. What is the composition of varnish?
A: Several types of cover oils commonly used in Indian iron are composed as follows:
1) Coconut oil alkyd varnish:
Coconut oil alkyd 5 to 7 parts amino resin 2 to 4 parts epoxy resin 1 to 3 parts organic solvent
2) Oil-free alkyd varnish:
Oil-free alkyd resin 5 to 7 parts of amino resin 2 to 4 parts of epoxy resin 1 to 3 parts of organic solvent
3) Soybean oil alkyd varnish:
Soybean oil alkyd resin 75 parts amino resin 25 parts
4) Dehydration ricinoleic acid epoxy resin varnish:
Dehydration ricinoleic acid epoxy resin 80 parts amino resin 20 parts



Source: <Printing Technology>

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