Development trend of digital ink jet printing

 

The technology of digital inkjet printing machine involves digital inkjet printing equipment, production method and process, which is a combination of software and hardware. The software part includes the collaborative design technology of textile pattern on the Internet, the special rip control technology suitable for many kinds of textiles, and the hardware part includes the electrical structure of digital inkjet printing machine. Vega high-speed digital ink-jet printing machine includes a guide belt driving medium conveying device, an ink-jet printing device, an ink supply device, a guide belt rectifying device, a synchronous lifting device of the ink-jet printing device, a guide belt surface cleaning device, a media sticking device on the guide belt, etc. On the basis of traditional image compression technology, Vega system adds the transformation from 4-bit RGB to 6-bit RGB format, and proposes a new effective coding and compression method for collaborative design of shared patterns.

 

Digital inkjet (reactive, acid) printing process. Digital ink-jet printing of fabric is only a part of the whole process of printing fabric production, and it can only be completed with matching fabric pre-treatment and post-treatment equipment. Fabric pretreatment → drying and flattening before printing → inkjet printing → drying after printing → steaming → washing → soaping → washing → drying. Pretreatment process. The selection of pre-treatment agent depends on the dye composition in the ink. For example, some enhancers can improve the dye fixation of reactive dyes and reduce the infiltration. Adding alkali sodium bicarbonate can accelerate the fixation reaction between reactive dyes and cellulose during steaming. The faster the fixation is, the more difficult it is to infiltrate. The main purpose of sodium alginate is to prevent the dye from swimming when the dye solution is infiltrated and dried, so as to improve the fineness of printing. It is also an important condition to improve the wetting of ink or color paste on the fabric and ensure the dye has a good dissolving state when fixing, so sometimes some surfactants are added to the pretreatment solution.

 

Fabric requirements. In order to get a bright and clear pattern, the fabric used in digital ink-jet printing should have the following conditions: fast absorption of ink or color paste, which can inhibit the penetration of dye solution: allow the ink drops to overlap, the adhered drops will not flow and penetrate; the ink drops can maintain a small and consistent size on the fabric, and the shape of the ink drops is round and the circumference is smooth. Therefore, for the application of digital ink-jet printing technology, the main measure to improve the printing effect is to carry out special pretreatment on the fabric to reduce the infiltration.

 

Spray printing. The high-speed guide belt type digital ink-jet printing machine absorbs the advantages of the traditional printing machine, and uses the guide belt conveyor mode of translation to meet the printing requirements of the whole roll, positioning and other fabric products. On the one hand, the printed fabric should be dried in time to prevent dye ink from color match. On the other hand, it should be steamed and washed in time to prevent the dye from being reduced or oxidized after long-term storage. The post-treatment process is as follows: steaming (00-0 ℃, 5-45 min) → cold water washing for one time (anti contamination soap agent g / L) → cold water washing for two times → 80 ℃ soap washing (neutral soap agent g / L) → cold water washing for two times → fixation and softness (fixing agent g / L, softener%, room temperature treatment for 5min) → drying (00 ℃). The continuous open width steamer or cylinder steamer can be selected as the equipment of steaming. Because the cylinder steamer has bright color, it is recommended to use cylinder steamer.