Shanghai Ziguang Company Successfully Introduced Flexless Drive Flexo Printing Machine

With the gradual promotion of flexographic printing and the improvement of users' requirements on the quality of printing products and printing efficiency, foreign flexographic printer suppliers have incorporated the latest technology in flexo printing equipment to meet the development requirements of flexographic printing and reduce the number of workers. Labor intensity. The majority of domestic suppliers have not yet fully realized this, and only stayed in the competition of low-grade flexo equipment. Although they temporarily met the needs of some entry-level printing companies, they also continued to widen the gap with their foreign counterparts. Shanghai Ziguang Machinery Co., Ltd. is dedicated to providing users with high-quality flexographic equipment at the beginning of the development of flexographic printing presses. In May 2005, Shanghai Ziguang Machinery Co., Ltd. took the lead in the successful development of the first full servo non-shaft drive flexographic printing press in China. On this basis, an automatic register system was developed for this device to ensure that the Ziguang flexo press technology is the “leader” in domestic equipment manufacturing companies.

Compared with the traditional mechanical shaft flexo press, the shaftless flexo press has the following features:

Higher control accuracy

In the mechanical axis flexo printing machine, the synchronization between each unit (paper feed, printing, die cutting, paper discharge, and single leaf cutting) is guaranteed by a mechanical shaft through a bevel gear box transmission with a phase adjustment function. . Due to factors such as the length, rigidity, dynamic balance accuracy, and staged power transmission of the mechanical shaft, inevitably, mechanical torque transmission instability and hysteresis caused by the transmission gap are unavoidable. Transmission system errors will produce register drift for high-precision prints, especially during acceleration and deceleration. Non-shaft drive flexo press uses servo motor to drive each unit, drive accuracy has been improved, servo motor accuracy up to 1/4,000,000 rpm, coupled with intelligent drive and high-speed microprocessor, the servo drive Data transmission is performed through a high-speed SERCOS fieldbus. The closed-loop design and rapid response capabilities of the system enable the device to maintain extremely high control accuracy at high speeds. After the automatic registration system is installed, the registration error of the printing unit on the main control screen can be monitored in real time, generally within ±0.06 mm. Compared with the flexo printing machine without automatic register, the registration error is reduced by half, which fully shows the important influence of the servo drive and the automatic register technology on the printing accuracy.

Constant tension system

The shaftless drive system incorporates a tension control function that is specifically designed for printing equipment. It can accept potentiometer signals from detecting the position of the dancer roller or tension sensor signals that detect tension. For servomotors for retracting and unwinding, entering and exiting paper, it is only necessary to define in the controller what process control mode the servomotor will work in (such as retracting reel mode and tension control mode), and the controller can automatically execute this servo The task assigned by the motor. In practical use, the controller can play an effective role whether it is a retracting and unwinding unit or a paper feeding unit.

Flexible control

The application of the shaftless transmission technology enables the concept of independent driving of each unit to be realized. Each unit can be linked together for printing overprinting or overprinting separately; it can use traditional method overprinting or accurate digital overprinting. It can realize that when some units are printing, other units complete the prepress preparation, which reduces the auxiliary time, and the combination of the machines is convenient, such as expansion, which improves the modularity of the machine, shortens the debugging time, and enhances the adaptability of the equipment.

Source: China Packaging News