UV CURABLE INK FOR GLASS UV-GI-30

UV-GI-30 is one of the UV curable inks in widest use for glass. It has no volatile solvent, no odors, and is specially fit for a large area of screen printing. The curing speed is fast, and the coat is high-hardness but not crisp, shows good abrasive resistance and excellent adhesion (100%). Benefits from no heated for long time, the ink has brighter color in compare with thermosetting ink. It can improve the water resistance by adding waterproof agent. Thus, the ink can apply for colorful, large areas and scales of glass products which need resisting water and freeze, such as glass products in shower room, bathroom and kitchen, freezer, the door of refrigerator, outdoor decorative glass, glass cup, glass plate and so on.

Specifications:

Product Code: UV-GI-30

30N   R236     Y208  BL072 G550 BK250 W170  R105     RST       Y3G

Color:  Clear, Pinkish Red, Yellow, Blue, Green, Black, White, Bright Red, Pinkish Red, Yellow;

Viscosity (25℃/CPS): 3500-4500;

Screen Mesh: 200-420;

Speed of UV Curing: 5-10 m/min;

Requirement of UV Curing: 80W/cm, 2 high pressure mercury lamps, 600mJ/cm²;

Adhesion to glass: 100%;

Hardness (H): ≥3;

Water Resistance: soaking in piped water for more than 24 hours and in boiled water for more than 1 hour;

Low Temperature Resistance: （-38℃~100℃）After thermal cycling, adhesion and highness are not affected.

Requirement of storage: the series of ink should be kept and stored in a cool, dry place that away from direct sunlight.

Shelf Time: more than 6 months.

Printing and curing:

       In order to improve the adhesion to glass and water resistance, it’s important to add 30# agent (1-2 %) to the ink before printing. The ink mixed with 30# should be used up as quickly as possible.

       Usually thinner is not necessary. If it is cold and the ink shows high viscosity, UV thinner can be added among 3-5%. It is advised to use screen (more than 300) to print four-color ink and use screen (more than 200) to print white ink.

       In the process of multicolor printing, it’s better to print light-color ink firstly and deep-color ink later. It is suggested to put a light-proof aluminum plate under the glass during UV curing.

Produce process:

1、  Adding 30# waterproof agent to the ink

Single-color printing: Adding 30# agent and mixing→Screen printing→UV curing→Heat treating (120-150℃/5-10min)→Production

Four-color printing:  Adding 30# agent and mixing→Screen printing the first color ink→UV curing→Screen printing the second color ink→UV curing→Screen printing the third color ink→UV curing→Screen printing the fourth color ink→UV curing→Heat treating (120-150℃/5-10min)→Production

2、  Printing clear-color thermosetting base ink GMP-32N

Cleaning and drying the glass→Screen printing GMP-32N→Heat curing (120-150℃/5-10min)

→Screen printing (or ink-jet print) multicolor UV curable ink for glass→UV curing

       Witch produce process to choose depends on applications of glass products. Common products such as photo frame, decorative painting and glass background, can be processed by the first process. If the products need excellent boiling resistance, or have to satisfy other strict requirements, the second process will be a good advice.

Table 1 Comparison between the two processes

Table 2 The influence of additive 30# in water resistance

Table 3 The influence of process in water resistance

The condition of printing and curing: screen (300) printing, two high pressure mercury lamps (80 W/cm), the distance of 12 cm between  lamps, the speed of 6 m/min, the condition of baking of 150 ℃/3 min, and soaking in boiling water for an hour.