Test number printing quality principle

With the development of digital media technology and the increase in the demand for personalized printing, more and more variable information on the print, such as bar code, number. Names, addresses, bills, etc. Therefore, the traditional printing industry is facing new challenges. It is necessary to increase the competitiveness of printing companies in the variable information printing market. The installation of variable information printing units on traditional printing presses is already the investment direction of printing companies. one.

In addition to the need to control the print quality, variable information printing also requires real-time monitoring of variable information to verify the accuracy of the information, to achieve a better overall quality control, to identify errors in the first place, and to reduce scrap rates.

Mechanical coding system due to print adhesion, mechanical transmission is not in place and other reasons, occasional bar code, number information will appear to skip. Heavy or wrong number. Computer-controlled inkjet or laser marking systems can also cause errors in the printing of variable information due to program errors or transmission of information, which can lead to product obsolescence. In this link, if you do not increase detection methods, errors are difficult to avoid.

However, it is very expensive to configure a set of bar code and number information identification and detection systems. In the process of using the “EE8000 Print Quality Online Video Monitoring System” produced by Luoyang Shengrui Electromechanical Technology Co., Ltd., we have been constantly exploring and found that only a few parameters need to be changed to make this system not only applicable to printed products. The fixed graphic and text information can be monitored online, and the variable number information can also be monitored in real time, so that it can be truly used in one machine and saves money. Now we will provide you with modification techniques and experience. We hope to share it with friends who use similar models.

Modification steps

Taking a ticket with a length of 5 inches as an example, the method for number detection is as follows:

1. Change the basic length of printing in the parameter setting dialog box to:

Bill length (5 inches) x 4 x 11, get parameter value is 220;

2. Flash interval time changed to: minimum 0.2 seconds;

3. Set the monitoring status to synchronous monitoring status.

After the parameters are set, adjust the display window so that the printing number is displayed on the display of the monitoring system. The last digit of the displayed number is a serial number, and the difference between the two displayed numbers is a fixed value of 11. If the current number of the ticket is 16000, the number will be displayed later as 16011, 16022, 16033 or 15989, 1 5978, 1 5967, etc. If it is found that the number is not continuous, the printing number may be wrong.

Monitoring principle

In the synchronous monitoring state, the monitoring system needs to satisfy two conditions at the same time. One is that the time interval between two snap shots is greater than the flash interval time, and the second is that the number of teeth turned by the drive gear of the printing press is an integer multiple of the basic length of the print. After both conditions are met, the flash fires and snaps a picture. Usually set the flash interval time to 0.5 seconds, 1 second, 2 seconds, etc., the basic printing length is set to 4 times the length of the note, in this condition, the time required for the gear to rotate through a basic printing length is shorter , less than the flash interval time, the monitoring system wait time is mainly to meet the flash interval time. Due to the uncertainty of the printing speed, each time the system captures pictures, the length of the gears is not the same. When the numbers are observed, the number changes in a random manner and there is no regularity. The right and wrong of the printing cannot be determined. If the flash interval time is set to a small value, such as 0.2 seconds, the basic unit of printing is set to a larger value. When the speed of the printing press is fixed, the printing machine transmission gear is rotated through a basic printing length. When the required time is longer than the set interval time 0.2 second, the system waiting time is the time required for the gear to go through a basic length of printing; then the basic length value of the printing can be properly set to make the number according to a certain rule. Display, by observing the changes in the displayed number, initially determine the right or wrong of the printed number.

Through refitting, the existing equipment has played a greater role, and it has truly done a small amount of money to do big things, and colleagues may wish to give it a try.