Label printing technology inventory (2)
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Silk screen: practical and anti-counterfeiting
What is silk screen printing: Screen printing belongs to stencil printing. It is called “four printing methods together with lithography, embossing and gravure printing. It is to stretch silk fabric, synthetic fabric or metal mesh on the frame and use manual Screen printing plates are produced by etching film or photochemical plate making. The modern screen printing technology uses a photosensitive material to make a screen printing plate by photolithography (so that the screen hole of the graphic portion on the screen printing plate is a through hole, and the mesh hole of the non-image portion is blocked. live). During printing, the ink is transferred to the substrate through the mesh of the graphic part to form the same image as the original, which is known as a kind of printing except air and water. "Universal printing method."
Main advantages:
1. The printing adaptability is very strong. The surface of different printing materials such as metal, plastic, ceramic, glass, paper, fabric, etc. can be printed on different printing surfaces, regardless of the printing area. Any other printing method can not be compared and replaced. ;
2. The process is simple, the investment is small, and the effect is quick;
3. The ink layer is thick, the stereoscopic effect is strong, the ink is good, and the color is bright;
4. can use a variety of types of ink: oily, water-based, synthetic resin emulsion type, powder and other types;
5. light resistance is very strong, color formation is better than offset printing;
6. the printing format is large;
7. with anti-counterfeiting features.
Limitations:
1. An original that is not suitable for reproducing fine lines and dots;
2. The registration accuracy is poor;
3. The speed is slower;
4. It is only suitable for monochrome original color originals with clear text and lines, and color originals with large contrast and clear levels. Applicable fields: A large number of cigarette labels and high-grade wine labels, beautifully printed, and good for anti-counterfeiting;
Future trends: The development of water-based screen printing inks has attracted the attention of screen printing materials factories and screen printing processing enterprises; screen printing materials will develop in high quality, water-based inks, high mesh screens, high resolution The photoresist will be the future direction. In the past, the middle and high-end market of photographic adhesives was occupied by foreign products. Now some domestic manufacturers have begun to produce high-resistance and high-resistance resin-type sensitization; domestic low-grade screens can basically meet the needs of the domestic market, but high-end The wire mesh still needs to be imported, and the development of high mesh screens will be the future development direction. Screen printing will play a major role in the field of security printing. The combination of screen printing and traditional printing methods will be more widely used.
Gravure: efficiency and stability
What is gravure: a gravure printed plate, the printed portion is lower than the blank portion, all the blank portions are on one plane, and the degree of depression of the printed portion varies with the depth of the image. The image is dark in color, and the corresponding part on the plate is concave deep, and the amount of ink on the printing plate corresponds to the light and dark level of the original image. When printing, the entire printing plate of the plate cylinder is coated with ink, and then the ink on the blank portion of the protrusion is scraped off by the squeegee device, and then the paper is pressed to transfer the ink on the printing portion to the substrate, thereby Finish printing.
Main advantages:
1. The ink layer is thick, the ink color is uniform (can be achieved in different batches), and the ink layer is quickly dried, which is the first choice for film printing;
2. high speed, wide width, low consumption, less downtime;
3. Adapt to a wide range of media, PVDC, PET, PE, NY, CPP, OPP, BOPP, composite film and other films and papers with the same properties as the above materials;
4. the product adapts to a wider range, especially suitable for flexible packaging, where the cigarette pack represents a very high printing process;
5. the equipment's comprehensive processing ability is strong, can be attached to glazing, laminating, coating, die-cutting, slitting, drilling, cross-cutting and other processes; maintenance and maintenance is convenient, long service life.
Limitations:
1. In traditional printing, gravure images and text use the same resolution, resulting in burrs on text and lines, not delicate enough;
2. The electroplating process in plate making is inevitable, so it is easy to bring environmental pollution;
3. Long plate making cycle and high cost;
4. the shape of the electric carving needle determines that the crater is a cone font, so half of the ink can not be transferred;
5. the general use of solvent-based inks, is not conducive to environmental protection, health and safety.
Applicable fields: printing of large quantities of paper and plastic labels.
Future trends: The development of eco-friendly inks such as alcohol-soluble inks and water-based inks has succeeded in maximizing the technological advancement of gravure printing; in the field of plate making, the continually seeking alternative materials for chrome-plated steel rolls and copper rolls will further reduce costs and improve The economics of gravure printing shortens the pre-press adjustment time and eliminates the shortcomings of short-run printing. At the same time, with the adjustment of the price of domestic high-speed gravure printing presses, the cost continues to decline, and eventually the market share of gravure printing will continue to increase.
Embossing: the main force of self-adhesive
What is embossing: The printed portion of a letterpress printing plate is higher than the blank portion, and all printed portions are on the same plane. When printing, the ink is applied to the printed portion. Since the blank portion is lower than the printed portion, the ink cannot be adhered, and then the substrate such as paper is brought into contact with the printing plate, and a certain pressure is applied to transfer the ink on the printing portion of the printing plate. Get the finished product on the paper. Since the blank portion is concave, the blank portion on the printed matter is slightly protruded during pressurization, and the surface on which the printed product is formed has an inconspicuous unevenness.
Main advantages:
1. the speed is faster;
2. Equipment cost is lower than traditional offset printing and gravure printing;
3. the group version is convenient, easy to add and delete, and can be used for printing large or special small batches of simple jobs;
4. the ink is thick, the gloss is strong, the ink has good performance, about 80%;
5. the printing plate is convex, the printing pressure is large, the color tone is bright and the lines are clear, the stroke is strong; the color strength and durability are stronger than the offset printing, which is slightly worse than the screen printing, but the level expression and the registration degree are stronger than the silk. Web printing and flexo printing.
Limitations:
1. Poor lead characters will affect the lines; plate making is not easy to control;
2. It is prone to increase the number of outlets;
3. The rotary embossing machine adjusts the printing chromatic aberration by controlling the flow rate of the ink in the ink fountain and the printing pressure; it is very unstable in the printing process, and often needs to rely on the experience of the operator to adjust it instantly;
4. The rotary embossing machine prints on a large area, which is prone to uneven ink layer and even whitening.
But now the letterpress printing equipment grades are quite different, there are round flat embossing machines, there are ordinary rotary embossing machines, there are professional hatchback, satellite or unit type self-adhesive label printing machines, so it can not be generalized.
Application: Suitable for paper, plastic, self-adhesive label printing.
Future trends: embossing is now replaced by lithography in many areas, but only in the field of old letterheads, envelopes and other text printing and carton packaging; in China, the technology and equipment used in the printing of labels such as stickers are still In the form of letterpress printing, round flattening and flat-pressing flat-panel printing equipment are gradually shrinking or even eliminated. Round-pressing round-turning and round-pressing circular-reciprocating paper-feeding half-turn embossing equipment has begun to be localized, and emerging flexographic printing has also It is beginning to bring a glimmer of life to ancient embossing for high-volume printing.