Special glossy printing technology (V)

The mirror ink printing step is divided into two stages. First, mirror ink is printed on the back surface of the sheet and thoroughly dried; then, an ink for Formable Surface Decoration (IMD) is printed on the mirror ink, which is then completely dried and then printed with a layer of 10 thick. The water-based adhesive is thoroughly dried to complete the printing process. The specific printing process for each process is as follows:

(1) Printing of mirror ink

1 printing process parameters.

Wire mesh: Use 270-300 mesh/inch polyester mesh;

Screen: solvent-resistant screen version;

Scraper hardness: 80o ~ 85o; such as: the United States Plegg PT-22. France Pegasus solvent-resistant squeegee.

Dilution: It is not necessary under general conditions. If necessary, add T-1000 thinner (it can be added when the viscosity increases during the printing process). Stir before use.

Drying: Heat and dry at 80oC for 10 to 15 minutes or 60oC for 15 to 20 minutes, drying at room temperature takes about 20 to 30 minutes, but the natural dry mirror effect is not as good as heat drying;

Wash Net: Use T-15 or T-31 solvent.

Screen printing environment: low temperature, low humidity, continuous screen printing without air circulation.

The photosensitive coating is selected from the solvent-resistant type, such as Sanhe Kemeilai's CP2 photosensitive adhesive or British Ke Tuote's PLUS II photosensitive adhesive or thin capillary film.

2 printing process skills.

a. Due to the different proportions of metallic toner, plastic resin and additives and additives, the components in the ink will be separated during storage, so be sure to mix thoroughly before use.

b. Because the viscosity of the ink is low, the screen with higher screen mesh should be selected when printing, and the doctor blade with higher hardness should be used. Usually 80o is used, and the scraping pressure of the scraper is appropriately reduced during printing.

c. To prevent jamming, be careful not to print where the air flows.

d. The network distance should be smaller and the screen tension should be slightly lower.

e. This ink is harder to print than ordinary ink. It is best to select a technical worker who has experience in printing.

f. In order to prevent the ink from absorbing the moisture and reduce the gloss of the mirror surface, the moisture should be avoided during printing and storage, and it should be dried at low temperature immediately after printing.

(2) Printing of IMD inks

After the mirror ink is completely dried, a layer of IMD ink (solvent type or photochemical type) is evenly coated on the mirror ink. The general use of lacquer or white ink to protect the mirror ink prevents high-temperature injections from flushing the mirror ink because the mirror ink is not resistant to high temperatures. This layer should have a certain thickness. If it is printed too thin, it can't evenly cover the mirror ink and it can be printed twice. (The position of the injection gate is preferably printed twice or printed with a layer of temperature-resistant ink. In addition, the correct design of the position and direction of the injection port of the injection mold is also an important factor because of the temperature of the injection fluid at the gate location. The highest pressure, high impact, the ink can be washed away.) This layer of IMD special ink can use solvent type such as Baolong Noriphan HTR, can also be used UV ink such as the promise of IMD special UV ink, process parameters are as follows:

1Noriphan HTR printing process parameters.

Wire mesh: Use polyester mesh of 90-120 mesh/cm;

Screen: solvent-resistant screen version;

Dilution: Noriphan HTR090 solvent dilution, Noriphan HTR097 buffer, Noriphan HTR097/003 slow drying agent. Diluent is selected based on the temperature and humidity of the screen printing environment. All solvents can be mixed in different proportions to achieve the desired drying speed.

Noriphan HTR097 is the most widely used and can use slow drying agent Noriphan HTR097/003 to extend screen drying time when printing fine lines.

Drying: After drying in a well-ventilated tunnel dryer at 60 to 80oC, dry it thoroughly in an IR oven at a temperature of 90oC for 1 to 5 hours. The drying time is based on the total amount of residual solvents evaporating. Sometimes the drying time is too long. Also for the election of ink film brittleness caused by cracking or flying oil and other ills.

Printing: Aqueous adhesive Aquapress HF-093, dried at 80oC for 5 minutes.

2 Noguchi IMD special UV ink process parameters

Wire mesh: Use polyester mesh of 120-180 mesh/cm;

Screen: solvent-resistant screens with a tension of about 20N/cm;

Auxiliaries: 073 stimulators, 100 thickeners, 060 net spot Varnish;

Drying: Two 120-watt/cm UV-curable medium-pressure mercury lamps with a curing speed of about 20 meters per minute;

Inscription: Waterborne adhesive Autotype SC, dried at 80oC for 5 minutes.

(3) Mirror ink printing on IMD parts

Since the binding force between the PC sheet + mirror ink + injection molding plastic is less than the binding force between the PC sheet + injection molding plastic, the mirror printing ink cannot be printed in full, and the edge of the PC printing plate must be left over. The amount enables the PC sheet and the injection molding material to be firmly combined, and the PC sheet and the injection molding plastic at the edge of the IMD workpiece are firmly bonded and will not be torn under the external force. The mirror ink and the PC sheet and the injection Plastics do not crack due to edge tears.

Source: Bison