337. What kind of resin is used for enamel enamel ink binder?
A: The synthetic resin used for the enamel enamel ink binder is generally a copolymer of acrylic acid and methyl ester and a polymer of butyl methacrylate, and the combination of the two is ideal. The amount of acrylic copolymer is controlled at 12% to 20%. The butyl methacrylate polymer has the property of promoting the conjunctiva on the surface of the printing ink, but the amount should not be too large.

338. What are the solvents used in the enamel color glaze ink binder?
Answer: The commonly used solvents for enamel enamel ink binders are mainly naphtha, terpineol and other solvents.

339. What resins are used for the binder in the enamel-enamel ink binder? What role?
A: The enamel enamel ink binder material generally uses 389-9 type alkyd resin as an auxiliary binder. Its main raw materials are double-drift soybean oil, rafting oil, pentaerythritol, benzoic acid, and phthalic anhydride. Since the 389-9 type alkyd resin is added to the ink, the ink is not easily scraped off the screen during screen printing, and the sticking network can be eliminated. After the pattern is transferred to the porcelain enamel, the burning of the enamelware can suppress the intense burning. The phenomenon of shrinkage caused the enamel to stick to the surface of the product and melted slowly. Therefore, the 389-9 type alkyd resin can play a dual role of auxiliary adhesive and improve screen printing suitability.

340. Why add reducing agent in enamel color ink?
Answer: In order to prevent certain components of the film and the color glaze ink from reacting with the pigment when it is heated, the color of the color glaze is lightened, especially the red color glaze ink containing cadmium sulfide and cadmium selenide. Add a certain amount of reducing agent - benzaldehyde, to ensure the color stability of red, orange, orange, flesh and other inks.

341. What role can plasticizers in enamel enamel inks do?
A: Adding plasticizer to the enamel color glaze ink can increase the toughness and stability of the enamel decal paper pattern, and has the effect of anti-aging, which can prolong the storage time of the flower film.

342. What should be paid attention to in the printing of screen printing enamel decals?
Answer: The printing process of screen printing enamel decal paper is different from that of other screen printing products. It is printed on the surface of water-soluble adhesive. Therefore, the temperature and humidity of the printing field must be strictly controlled. If the temperature is too high, the adhesive surface will be dissolved and it will be difficult to print. More seriously, it is easy to burst flowers.

343. What effect does the floral transfer film on decals play?
A: The floral transfer film is an organic polymer film. The application of a thin film on the printed floral paper facilitates the transfer of decals. The decals are soaked in water for 1 to 2 minutes. The pattern adheres to the film and leaves the backing paper to become a flower carrier. Afterwards, it is adhered to the surface of the enamel product, dried, and then it is colored at a high temperature of 800°C.
344. Which requirements should be met for the flower transfer film?
Answer: The enamel flower transfer film must meet the following requirements:
1) The decomposition temperature of the film is lower than the decomposition temperature of the varnish;
2) No chemical reaction occurs with the color glaze, so as to ensure that the color glaze still has original luster and luster after burning;
3) The film forming performance is good, and the film has certain strength and toughness, so as to adapt to the transfer requirements of the flower paper; the quality of the raw materials must be stable and have a certain storage period.

345. Which type of synthetic resin is used for the transfer of flowers? How is the recipe?
A: The floral transfer film is a polymer film of methyl methacrylate polymerized in butyl methacrylate. The polymerized solvent-containing glue solution is then formulated into a film coating solution. The formula is as follows:
Polymer glue 70~80ml
Butyl acetate 20～30ml
Benzaldehyde 0～5ml
Dibutyl phthalate 2～5ml

346. What problems should be paid attention to when applying a flower transfer film?
A: When the coating film is required to be uniform, the thickness of the dried film should be between 20 and 30 μm. It is advisable to use a thin film, as long as it can be re-posted and smoothed. Excessive thickness of the coating can cause fine white spots to burst or patterns and the gloss level decreases. Another screen printing coating can be used.

347. There are several methods of fabric printing?
A: According to different process principles used in printing, fabric printing can be divided into eight methods, namely direct printing, discharge printing, anti-inking printing, infiltration printing, etched printing, thermal transfer printing, blue printing cloth and electrostatic flocking Wait.

348. What is direct printing?
A: Direct printing is the use of dye-containing paste printing ink (ie, printing ink) directly printed on the fabric, and then through a series of treatment, the desired pattern is reproduced on the fabric. The direct printing process is simple and the cost is low. It is a widely used printing process in textile printing.
In general, silk fabrics use acid dyes or direct dyes. Man-made fabrics use direct dyes. Polyester fabrics use disperse dyes.

349. What is the discharge printing (carving)?
A: Discharge printing is the first to print the discharge agent on dark fabrics, and then destroy some pigments that have been dyed, so as to obtain various light-colored patterns and patterns on a deep background.

350. What is the discharge agent?
A: The discharge agent is a chemical that can decolorize the stained background color, such as hanging white block, stannous chloride, etc.

---"Printing Technology"