Non-woven bags generally use screen printing technology, which is often referred to as "silkscreen", which has always been a common printing process for many manufacturers. Manual printing is generally used, so the control of color on the process is not well controlled. However, as customers have increasingly improved the product's fine print and environmental protection requirements, many new non-woven bag printing methods have emerged: watermarks, gravure printing, Thermal transfer.
Here we introduce the mainstream non-woven bag printing methods on the market.
Because of its use of water-based mortar as a print medium named after the textile printing is more common, also known as printing. The color paste and the water-based elastomer glue are blended during printing. The printing plate does not use chemical solvents and can be washed directly with water. It is characterized by good coloring power, strong hiding power and fastness, and resistance to washing, basically no odor.
Second, gravure printing
Finished products processed by this method are usually called non-woven non-woven bags. This process is divided into two steps, namely, the traditional gravure printing process is used to print the graphic on the film, and then the film with the printed pattern is compounded on the non-woven fabric by the lamination process. This process is generally used for non-woven bags with large area color pattern printing. It is characterized by exquisite printing, full machine production, and short production cycle. In addition, the product has excellent waterproof performance, and the durability of the finished product is also better than non-woven bags produced by other processes. The film has two choices of light and matt, matte matte effect. The disadvantage is that there is a conflict with the concept of environmental protection because the film is difficult to degrade.
Third, thermal transfer
Thermal transfer is a special type of printing in printing. This method requires an intermediate medium, that is, the image is first printed on a thermal transfer film or a thermal transfer paper, and the pattern is transferred to the non-woven fabric by warming by a transfer device. The medium commonly used in textile printing is a thermal transfer film. Its advantages are: exquisite printing, rich hierarchical edition, comparable to photos. Suitable for small area color image printing. The disadvantages are high prices and high printing costs.
Fourth, non-woven bag screen printing features
1. Not subject to the size and shape of the substrate. In general, printing can only be carried out on a flat surface. Silk screen printing can not only be printed on a flat surface, but can also be printed on shapes and concave and convex surfaces of special shapes. It can also print a variety of large-scale advertisement paintings, curtains, and curtains.
2. The layout is soft and small. Silk screen printing plates are soft, flexible, and have a small press pressure, so they can be printed not only on soft substrates such as paper and textiles, but also on glass-ceramic vessels that are easily damaged by pressurization.
3 ink layer thick coverage. Screen printing ink thickness up to 30Î¼m ~ 100Î¼m, therefore, the hiding power of ink is particularly strong, can be pure white printing on black paper. The thickness of the screen printing ink is strong, and the three-dimensional printing image is strong, which is unmatched by other printing methods.
4. Applicable to various types of ink. The wide range of inks used in screen printing has exceeded the scope of the usual ink definition. Actually, there are pastes, plastics, paints, adhesives, or solid powders. Therefore, screen printing inks are sometimes collectively referred to as "printing materials."
5. Strong light resistance. The problem of ink classification in a broad sense should be classified according to the type of printing, namely, letterpress ink, lithographic ink, gravure ink, and filtered ink. However, such classification is too principled to express all realities. In recent years, due to the ever-increasing variety of inks, new designs have appeared continuously. There are limitations only because of the type.