Narrow web printing refers to narrow flexographic and letterpress printing. In recent years, special processes such as cold stamping, hot stamping, laminating, glazing, and super glazing have gradually become the mainstream technologies for narrow-web rotation applications.
1. Printing method
At present, narrow-web rotary printing has covered various printing processes. The mainstream method has been developed from letterpress printing to flexo printing, and has been combined with web offset printing, web transfer printing, and rotogravure printing.
With the internationalization of well-known brand owners have set up branches in China, the packaging labels of products have gradually become localized. In order to meet the globally unified quality requirements and anti-counterfeiting needs of these companies, processability has become more and more complex. Connecting multiple process applications has also become a market choice. Currently, Nilpeter only provides four processes for flexible printing, offset printing, gravure printing and screen printing on a single production line to meet customer requirements for multiple processes. .
2. Special processing technology
Cold stamping is the use of a group of flexographic units for the glue coating unit. The printing materials are laminated with the cold stamping film. After the UV curing, the hot stamping effect is displayed. The printing speed is fast and the cost is low. The effect of halftone and gradient halftone images is presented.
Super glazing is to transform the original glazing effect with orange peel effect into a mirror effect with extremely high brightness. The brightness exceeds that of the high gloss film, and the cost is far lower than that of the film.
3. UV process
UV printing is colorful, fast drying, and strong ink adhesion. Cold UV applies thin film printing, uses special filter glass to block the infrared light in the light box, discharges the heat through the exhaust system and the water cooling system, and is equipped with a water cooling roller or water cooling pillow at the bottom of the printing material, absorbing and adhering to the surface of the material. Heat does not generate heat distortion. For in-mold labels and film labels, cold UV is the basic configuration of such high-end products.
The narrow-width rotary equipment is divided into a main shaft transmission method, a servo transmission method, a central stamping method, and a unit-type printing method.
1. Is there a servo drive
As far as the servo drive is concerned, it greatly helps the overall performance of the printing equipment. The main advantages are as follows.
(1) Reduce the preparation time.
(2) Reduce the adjustment time of old products by about 30%.
(3) Reduce the adjustment time of new products by about 40%.
(4) There are several million pulses per revolution of the motor, precise positioning, ratio, and speed control, coupled with intelligent drives and high-speed microprocessors, greatly improving the printing accuracy.
(5) To avoid torsional instability and hysteresis caused by shaft and gear transmission, and to improve the positioning drift and gear stick.
(6) It is no longer controlled by the gear pitch and can be adjusted freely.
(7) Eliminating high-powered drive motors, reducing power consumption, and eliminating mechanical transmission mechanisms, greatly simplifying the structure and making maintenance easier.
2. Group printing
The unit type narrow-width printing apparatus has the difference between the conventional unit type printing and the platform-interchangeable unit type printing. The platform unit type printing method is Nilpeter's earliest invention and applied to the narrow-width rotary printing equipment. The printing equipment of the platform type unit can freely change the printing plug-in, which is very flexible, because it has the characteristics of preparation for off-line adjustment and has Very flexible replaceable performance, so it has been adopted by many narrow-web rotation manufacturers.