In the past few years, we have seen the rapid growth of inspection systems in the processing industry. Today, 100% fully automatic defect detection technology has been realized. Today, you can hear the word "defect detection" in almost all industries. In the packaging processing industry, it can help to find out all the defects on the printed products, which are applicable to different printing methods.
100% automatic defect detection, that is to say, the system can help the operator to monitor the product quality in the printing process in an all-round way, and ensure that every printed product is qualified.
Currently, there are two basic types of detection systems on the market for this technology, 100% sampling and 100% comprehensive.
The 100% sampling type refers to repeatedly selecting a printed part within a period of time, and performing 100% monitoring on the part. The repetition time may vary from a few seconds to several minutes.
The 100% comprehensive type monitors 100% of each part of the product processed on the printing press. These two systems use diametrically opposed two camera technologies-progressive scanning (using a linear CCD camera) and block-by-block scanning (using a general CCD camera). The 100% comprehensive inspection system based on block-by-block scanning is relatively new in technical content, and its application in some packaging is better than the line-by-line scanning technology.
Let us look at some application examples below, and analyze the advantages of the 100% detection system in detail.
Coverage and sampling rate The detection area of ​​a 100% sampling system is determined by the field of view, processing capability, and system power. A 2 Hz system can capture two pictures per second, and 10 Hz at 10 frames per second. If it is the same field of view and processing time, the sampling area of ​​a 10 Hz system is 5 times that of 2 Hz. For example: two systems with a 7x9-inch field of view (their processing speed is the same for the convenience of discussion), sampling 35-inch prints at a speed of 800 feet per minute, and 336,000 square prints passing through the device per minute inch. The 2 Hz system detects 7,560 square inches of printed material per minute, which is 0.02% of the entire screen area. The 10 Hz system detects 37,800 square inches per minute, accounting for 11% of the entire printed area. Repetitive defects and non-repetitive defects For non-repetitive defects, is the detection system familiar? Answer: No. The 100% sampling system will only detect defects that the camera sees on a particular printed part at a certain moment. To be precise, the 100% sampling inspection system does not have the function of finding defects on the entire printed product. Their advantage lies in the ability to accurately monitor certain specific characteristics of the processing quality, such as color, overprint, stripes and repeatability defects. The 100% comprehensive detection technology can help you find the lack of the entire printed product, but the investment of this system is more than 3 times that of the usual type. The customer must prove that there is a real need before the investment can have a tangible return. They also have common uses, such as distinguishing qualified products from unqualified products. But please consider the strategy of removing all unqualified products and the benefits of optimizing the processing. After understanding the difference between the two basic inspection systems, it is necessary to grasp the waste problem. To explain this problem, please see the scrap and downtime data on Table (1). With these data, you can further determine what kind of inspection system you really need.
If you want to make a specific analysis, the data record analysis must have 3 months of information, 6-12 months is ideal, the data reliability of this table is very high. It lists the amount of waste and downtime related to printing. With this table, you can determine the loss of each processing problem and formulate related corrective measures. If the biggest part of the printing problem lies in the direction, the 100% sampling type detection system is the best solution. It is designed to determine directional problems such as color and overprinting, which can provide operators with effective information and improve their Management of the entire processing procedure. But if the fundamental problem lies in non-repetitive defects, your choice should be a 100% comprehensive inspection system. All in all, before investing in a fully automated inspection system, please spend a certain amount of time and resources on similar data. If you ignore this process, you may be taking a big risk, and printing quality problems will be a big trouble. Conclusion Today, there are many types of detection systems on the market, each with its own characteristics. A truly efficient 100% inspection system must have coordinated technology to specifically correct or prevent problems that actually cause waste. If the system is selected properly, the effect of reducing processing costs is significant. But before you buy, you must make certain preparations, you must determine the type and cause of the printing waste you are currently facing, choose the appropriate detection system according to different reasons, and cure the stubborn disease by treating the symptoms.
NINGBO HOZ TRADING CO.,LTD , https://www.hoz-kitchenware.com