Non-woven bags are generally used screen printing process, which is often referred to as "silk screen", which has always been a printing process commonly used by many manufacturers. Generally, they are printed manually, so the color control in the process is not easy to control. However, as customers continue to increase the exquisiteness of product printing and environmental protection requirements, many new non-woven bag printing methods have emerged, mainly including: watermark, gravure printing, Thermal transfer.
Here we introduce the mainstream non-woven bag printing methods currently on the market.
1. Watermark
It is named because it uses water-based elastic rubber paste as the printing medium, which is more common in textile printing, also called printing. Mix color paste and water-based elastic rubber during printing. No chemical solvent is needed when washing the printing plate, it can be washed directly with water. It is characterized by good coloring power, strong hiding power and fastness, washing resistance, and basically no odor.
2. Gravure printing
The finished product processed in this way is usually called a laminated non-woven bag. This process is divided into two steps, that is, the traditional gravure printing process is used to print the graphics on the film, and then the laminating process is used to compound the printed film on the non-woven fabric. Generally, nonwoven bags printed with large-area color patterns adopt this process. It is characterized by exquisite printing, machine production throughout, and short production cycle. In addition, the product has excellent waterproof performance, and the durability of the finished product is better than that of non-woven bags produced by other processes. The film is available in two options: bright and matt. Matte has a matte effect. The disadvantage is that it conflicts with the concept of environmental protection, because the film is difficult to degrade.
Three, thermal transfer
Thermal transfer is a special printing in printing. This method requires an intermediate medium, that is, first print the image on the thermal transfer film or thermal transfer paper, and then transfer the pattern to the nonwoven fabric by heating the transfer device. The media commonly used in textile printing is thermal transfer film. Its advantages are: beautifully printed, rich layered version, comparable to photos. Suitable for small area color image printing. The disadvantage is the high price and high printing cost.
4. Features of screen printing for non-woven bags
1. Not limited by the size and shape of the substrate. Generally, printing can only be performed on a flat surface, and silk screen printing can not only print on a flat surface, but also print on special shapes and concave-convex surfaces, and can also print various large-scale advertising pictures, vertical curtains, and curtains.
2. The layout is soft and the pressure is small. The screen printing plate is soft and flexible, and the printing pressure is small, so it can not only print on soft substrates such as paper and textiles, but also print on glass and ceramic vessels that are easily damaged by pressure.
3. Strong coverage of thick ink layer. The thickness of screen printing ink can reach 30μm ～ 100μm. Therefore, the hiding power of the ink is particularly strong, and it can be used for pure white printing on completely black paper. The thick ink layer of screen printing and the strong three-dimensional feeling of the printed graphics are unmatched by other printing methods.
4. Suitable for all types of inks. The wide range of inks used in silk screen printing is beyond the definition of ordinary inks. In fact, there are pastes, plastics, paints, adhesive or solid powders. Therefore, sometimes screen printing inks are collectively referred to as "printing materials".
5. Strong light resistance. The problem of ink classification in a broad sense should be divided according to the type of printing plate, that is, it is divided into letterpress ink, lithographic ink, gravure ink and filtered ink. However, such a classification is too principled to express all the realities. In recent years, due to the increasing variety of inks, new patterns have appeared continuously. The only difference is the pattern type, which has limitations.
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