Guide: When the packaging products are formed and surface-treated, it is necessary to print the images, so that the company’s product information and brand information can be conveyed through graphic printing. There are many kinds of common graphic printing. Here we mainly introduce several common techniques in the cosmetics packaging industry, such as silk screen printing, pad printing, thermal transfer, hot stamping, water transfer printing and other processes. In this article, we briefly describe the processing technology of silk screen printing, which is only for the purchase of new people to understand the basics:
Silk screen printing means that the ink is transferred to the substrate through the mesh of the graphic portion by the extrusion of the squeegee to form the same graphic as the original. The screen printing equipment is simple, easy to operate, simple in printing and plate making, low in cost, and strong in adaptability.
- Process characteristics
Process cost: mold cost (low), single piece cost (low, depending on the number of colors)
Typical products: for clothing, electronics and packaging, etc.
Yield is suitable: from single piece to large batch
Quality: the quality of the pattern details is extremely high
Speed: manual silk screen (1-5 cycles / minute), machine silk screen (1-30 cycles / minute)
2, process costs
The cost of the mold is low, but it depends on the amount of color, because each color is separately plated.
Time cost: machine screen printing up to 30 per minute, hand-screening up to 1-5 per minute
Labor cost: in manual silk screen printing, labor costs are high, especially when it comes to colorful printing
1, screen printing machine
The screen printing machine is divided into vertical screen printing machine, oblique arm screen printing machine, rotary screen printing machine, four-column screen printing machine and automatic screen printing machine.
2, Silk Screen Plates
Due to the different photosensitive materials used in the screen printing, the production process is also different, but no matter which process is adopted, the following steps are indispensable in the production process: screen and frame selection, drawing, smashing, coating photosensitive materials. , exposure, development, drying.
3, screen printing ink
Screen printing ink refers to all inks used as screen printing inks when screen printing is used. Although screen printing inks are a type of printing ink, there are many ways to distinguish the types of screen printing inks.
- Direct plate making method
Method: The method of direct plate making is to first place the photosensitive film coated with the photosensitive material on the surface of the work surface, and put the stretched wrist frame flat on the substrate, and then put it in the frame. Into the photosensitive paste and pressure coating with a soft scraper, after drying enough to remove the plastic base, attached to the photosensitive film wrist mesh can be used for printing, after development, drying to produce a screen printing screen.
Process flow: stretched net ? degreased ? dried ? peeled base ? exposure ? development ? drying ? revision ? sealing net
- Indirect plate making method
Method: The indirect plate making method is to expose the indirect film first, harden it with 1.2% H2O2, develop it with warm water, and dry it to make a peelable graphic film. When making the plate, the graphic film surface is tightly attached to the stretched wire mesh. The film is adhered to the wet wire mesh by extrusion, the film base is peeled off, and the screen printing screen is made by drying with the wind.
1) Stretched net ? degreased ? dried
2) Indirect film ? exposure ? hardening ? development ? lamination ? drying ? revision ? sealing network
3, straight mixed plate making method
First, the photosensitive adhesive layer is adhered to the screen frame by water, alcohol or photosensitive glue, and after drying by hot air, the base of the photosensitive film is removed, and then the plate is printed, and after development, the screen plate is formed.