250. What are the requirements for the resin of canned meat inside?
Answer: The resin used for canning in meat cans must be a highly cross-linked polymer that is resistant to oils and sulphides.
251. What type of resin is used for interior coating of aluminum cans for beer and carbonated beverages?
A: The internal paints for aluminum cans for beer and carbonated beverages are generally based on ethylene-based organosols. The baking temperature is 200Â±5Â°C and the time is about 8 minutes.
252. What are the drying characteristics of the two-fluid reactive metal screen printing ink?
A: Two-component reactive inks are two-component reactive inks. They use two components with completely different chemical properties and are mixed thoroughly before printing. Immediately after printing, polymerization occurs and the film is dried after printing. The drying time is 2 to 4 hours for the touch drying, 5 to 7 days for the complete drying, and 15 to 20 minutes for the heating and drying at 100Â°C.
253. How about a two-component reactive ink formulation? How to mix?
A: Two-component screen printing ink formulation made of epoxy resin and polyamide:
Group A includes:
Titanium dioxide 40%
Epoxy resin 37%
Ethylene glycol monobutyl ether 13%
100# solvent oil 10%
Group B includes:
Polyamide resin 74%
Ethylene glycol monobutyl ether 10%
100# solvent oil 16%
The mixing method was as follows: Group A was all mixed before printing, and 15% to 25% of the mixture of Group B was mixed with Group A before printing.
254. Metal screen printing resist ink how to use in the printed circuit board?
A: The resist ink is mainly used in printed circuit boards. The manufacturing process is to print the ink on the surface of a sheet of metal conductor (usually copper) (attached to the insulator) according to the design. After the ink is dried, put it into an acidic solution, such as In the ferric chloride or ammonium persulfate solution, the portion not printed with ink is etched away, and the portion where the resist ink is printed is protected and retained. Then use the mixed solvent to remove the ink. At this time, a printed circuit board is basically completed.
255. Metal screen printing resist ink is divided into several categories?
A: Metal screen printing resist inks can be divided into four categories: solvent-based resist inks, alkali-soluble corrosion-resistant inks, UV-curable corrosion-resistant inks, and infrared-cured corrosion-resistant inks.
256. What is the anti-corrosion mechanism of alkali-soluble resist inks?
A: Alkali-soluble anti-corrosion inks need to use alkaline solution in addition to the film, which is characterized by the anti-corrosive resin with alkali-soluble. Generally, a polar group such as carboxyl (-COOH), hydroxy (-OH), sulfonic acid (-S03H), amino (-NH2), phosphoric acid (-PO3R), acyl and the like is added to the resin molecular chain to increase its Hydrophilicity in water, or addition of ester groups, is achieved by saponification in an alkali to achieve stripping. E.g:
In the formula, R, R' represents an alkyl group, an aryl group, etc. The addition of these groups achieves the purpose of alkali-solubilized stripping, and the resist resin is dissolved in a solvent.
257. What are the main components of alkali-soluble anti-corrosion inks?
A: The main components of alkali-soluble anti-corrosion inks include resist resins, fillers, pigments, and ink additives.
258. What is the etching solution formula and film removal method using Alkali-soluble anti-corrosion ink screen printed aluminum sign?
A: The aluminum plate etching solution is:
Viscosity 16~18Â°Be`( Baume degrees)
The film can be removed at 70Â°C in a 3% aqueous solution of sodium hydroxide or it can be removed with an organic solvent.
259. What are the main technical indicators of resist ink?
A: The main technical indicators of resist inks are: viscosity (PaÂ·s) is 25Â°C, 3ï½ž6; fineness â‰¤20Î¼m; corrosion resistance includes resistance to acidic solution such as ferric chloride, copper chloride, ammonium persulfate, etc. Corrosion; film removal time, 20 Â°C, less than 1 minute; printing performance, with 280 mesh screen printing, non-stick mesh, no wire drawing, no obvious bubbles and pinholes.
260. The use of plating ink and performance? Which kind?
A: The electroplating ink is mainly applied to the three-dimensional embossing and finishing process of metal surfaces, ie, screen printing negative images, which are deposited by electroplating to produce a three-dimensional relief effect. Its performance is resistance to etching. The plating resist ink should also have the appropriate thixotropy, the negative pattern printing ink does not expand, does not dissolve in the plating solution, does not contain the conductive material and so on. There are mainly four types of inks, asphalt type, modified polyethylene type, synthetic rubber type and thermosetting epoxy type.
261. How to deal with the corrosion of the surface of the positive sign corrosion substrate?
Answer: For copper-based and iron-based materials, the surface oxide layer can be removed in dilute sulfuric acid, rinsed with running water, dried and printed. Aluminum-based materials are generally removed from the hot sodium carbonate solution to remove oil stains. After cleaning and drying, they can be printed to remove oil stains. Organic solvents or cleaning agents can also be used. If there are serious pits, scratches, and oxidation spots on the surface of the metal substrate, it can be treated by mechanical polishing or rubbing and brushing, and then degreasing.
262. Screen printing thick anti-corrosion printing materials how to modulate?
A: thick lacquer printing material is a traditional printing material, generally used dry oil thick paint, add a certain amount of phenolic varnish, alkyd varnish, asphalt acid paint and other preparation.
263. How to use offset printing ink to modulate screen printing resist printing materials?
A: In the past, thick lacquers were commonly used as screen printing ink materials. Due to the difficulty in dripping printing when using fine screen printing, offset printing inks are now used for printing. Commonly used are Peony, Xiangyang (Tiannu) and Red Lion offset inks. The preparation method is made of 75% to 80% of ink, 20% of alkyd varnish, and 3% to 5% of dry oil.
Alkyd resin, amino resin, epoxy resin and acrylic resin are used.
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