Nonwoven bags generally use screen printing technology, which is often referred to as "screen printing", which has been a more commonly used printing process for many manufacturers. In general, manual printing, so the process of color control is not well controlled, but with the guests on the product printing and environmental requirements, the emergence of many new non woven bag printing methods, mainly: watermark, intaglio printing, hot transfer.
Here we introduce the mainstream non-woven bag printing methods in the market.
Because of its name, it is commonly used in textile printing, also called printing. In printing, the color pulp is blended with the water-based rubber glue. The printing plate does not need chemical solvents and can be rinsed directly. Its characteristics are good coloring power, strong covering and fastness, washable, and basically no odor.
Two. Intaglio printing
The finished products processed in this way are usually called double membrane nonwoven bags. The process is divided into two steps, that is, the traditional gravure printing process is used to print the graphic to the film, and then the film coated with the patterned film is combined on the non-woven fabric. This process is commonly used for printing non-woven fabrics in large area color patterns. Its characteristics are exquisite printing, the whole process of machine production, short production cycle. In addition, the product has excellent waterproof properties, and the durability of finished products is better than that of non-woven fabric bags produced by other technologies. The film has two options: gloss and matte, matte finish. The disadvantage is conflict with environmental protection concept, because thin film is difficult to degrade.
Three. Heat transfer
Heat transfer is a special type of printing in printing. The method requires intermediate medium, that is, first print the picture and text to the heat transfer film or heat transfer paper, and then transfer the pattern to the non-woven fabric by heating the transfer device. The commonly used medium in textile printing is thermal transfer film. Its advantages are: beautifully printed, rich layered editions, comparable to photographs. It is suitable for small area color image printing. The shortcoming is high price and high printing cost.
Four. Characteristics of screen printing for non woven cloth bags
1. is not limited by the size and shape of the material. The general printing can only be carried out on the plane, and the screen printing can not only be printed on the plane, but also can be printed on the special shape and concave convex surface, and it can also print all kinds of super large advertising paintings, curtain and curtain.
The 2. layout is soft and press small. The screen plate is soft and elastic and has small press, so it can be printed not only on soft substrates such as paper and textiles, but also on glass, which is easily pressurized and damaged.
The thickness of the 3. ink layer is strong. Screen printing ink thickness can reach 30 to 100 m m, therefore, the ink cover is particularly strong, can be made on pure black paper pure white printing. The thickness of ink layer in screen printing is strong, and the stereoscopic sense of printing is strong. It is impossible to compare other printing methods.
4. the application of various types of ink. The wide range of ink used in screen printing has exceeded the usual definition of ink. In fact, some are sizing, plastic, paint, adhesive or solid powder. Therefore, sometimes the screen printing ink is collectively referred to as "printing material".
5. light resistant performance is strong. The generalized ink classification problem should be divided into printing plates, namely, relief ink, lithographic ink, gravure ink and filter ink. But this kind of classification is too principle, can not express all the actual situation, in recent years, because of the increasing number of ink varieties, new type of flower and color continuous appearance, only by the type to divide, there are limitations.
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