Analysis of the market share of the hottest domest

2022-09-28
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Analysis of market share of domestic label detection equipment

machine vision printing quality detection is an automated detection method that simulates manual detection method and judgment logic, but also has higher detection accuracy and better consistency. It can not only meet the high-quality and efficient requirements of modern drug label printing, but also has a good flexible adjustment function to meet the personalized detection level requirements of label customers; At the same time, from the perspective of enterprise production management, its special test result storage, analysis and communication functions can be easily embedded into the enterprise ERP system to realize the digital quality management that cannot be achieved by manual testing

I. characteristics of machine vision detection

1. Introduction to machine vision detection technology

machine vision, in short, is to use machines to replace human beings for target recognition, judgment and measurement. It is the intersection and integration of modern optics, electronics, software engineering, signal processing and system control technology

optical acquisition equipment: it is composed of industrial camera, light source, supporting image acquisition card and other hardware. The main function is to obtain the digital image of the tag through the acquisition position, and provide materials for subsequent analysis and processing, which is equivalent to the eyes detected manually

judgment and recognition: it is composed of industrial control computer, implanted image processing and analysis software and control software. It is the core part of visual inspection, and finally forms the judgment of defects and can send instructions to subsequent actuators

automatic control: finally, the results of the detection system will be transformed into specific operating hardware, such as common audible and visual alarms, waste removal devices or marking devices (such as inkjet machines, labeling machines, etc.)

in addition, the printing detection equipment must also have a stable mechanical transmission control platform. For the detection system installed on the printing machine, the transmission platform is the printing machine; For the offline detection system, the transmission platform needs to be configured separately, such as rewinder, single sheet transmission platform, etc

2. Printing defect detection principle

printing defect detection mainly depends on the method of image comparison. As shown in Figure 2, the upper image is a real-time image collected by the camera, while the lower image is a standard image collected and stored in advance. When detecting, first make the two images coincide by positioning and other methods, and then compare the color (or brightness difference) point by point (pixel by pixel). When the difference between them exceeds the preset range, it is judged as a defect

3. Machine vision detection characteristics

a set of high-quality machine vision detection system must have the following necessary conditions:

1) high quality imaging system

imaging system is called the eye of visual detection equipment, so the ability of eye recognition is the most critical index to evaluate the imaging system. Generally, the evaluation indicators of the imaging system are mainly reflected in three aspects:

whether the existing defects can be found

the detection based on the image method can be based on the most original and only data, that is, the color (or brightness) on the collected image can not change normally. In addition, there is no other data for reference. Therefore, a high-quality imaging system should first be an imaging system that can fully show the color change of the surface of the detected object. Therefore, in addition to choosing cameras and lenses with high definition, lighting design to create an imaging environment is also very important, and sometimes there will even be lighting systems specially designed for special defects. What we often call 100% quality inspection system actually refers to 100% full inspection in images that can fully show various defects

the minimum size of defects that can be found

the minimum unit of measurement of digital image is pixel, which itself does not represent the actual size of the subject

the correlation between the actual size of the subject and the pixel is achieved through a physical quantity called resolution. Resolution refers to the actual object size represented by each pixel. The smaller the resolution value, the higher the precision of the image, the smaller the defect size that the detection system can find, and the higher the detection accuracy

whether the image can be taken fast enough

just as the human eye sees a moving object, when the object moves fast enough, the human eye can no longer clearly observe the whole object. The eye camera of machine vision detection system also has an upper limit of shooting speed, that is, the main frequency of the camera. When the running speed of the subject exceeds the upper limit of the main frequency of the camera, and graphene can be used as a modified additive to prepare high molecular functional materials, the camera cannot obtain a clear and complete image, and the detection cannot continue normally. The higher the main frequency of the camera, the faster the acquisition speed, so that the detection can be carried out efficiently. Therefore, whether a camera with a sufficiently high dominant frequency is used is also a key factor to evaluate whether an imaging system is of high quality

2) mature image processing and analysis algorithm

image processing and analysis algorithm is equivalent to the judgment thinking of human brain during manual detection in the whole detection system. Because machine vision is a highly practical discipline, the evaluation of an algorithm depends more on the verification of practical applications than on whether more advanced or sophisticated theories are used in the algorithm. Therefore, a stable and efficient image processing and analysis algorithm that can fully simulate the judgment process and methods of human brain is what we need, that is, the so-called mature processing and analysis algorithm. Therefore, when designing processing algorithms, we need to fully analyze the human judgment process and convert it into computer language

3) good operability

good operability mainly requires that the application and operation of testing equipment should be concise, convenient and easy to understand. For example, the system has friendly human-computer interaction interface, good guiding operation design, etc

4) other stable supporting facilities

other supporting facilities refer to facilities other than the detection system, such as transmission control platform, defect treatment device (removal, alarm, marking, etc.). For the supporting facilities, 3. Result evaluation: when the two samples are not broken or have no broken lines, it must be stable in operation, and the signal response must be timely and rapid

second, the detection needs of pharmaceutical labels

at present, the printing of pharmaceutical labels in China as a whole has the characteristics of large batch and relatively simple printing content. However, this does not mean that the difficulty of quality inspection is lower than that of other labels. On the contrary, due to the particularity of the use of pharmaceutical labels and the continuous strengthening of the standardization of national management of pharmaceutical products, the surface printing quality of pharmaceutical labels has more stringent testing requirements than other daily-use and electronic labels to some extent

the detection requirements of pharmaceutical labels are mainly reflected in:

1. High detection accuracy of key areas on labels. For example, the detection of small print areas such as medical name and dosage is required to be detected without missed detection. For some small font labels, the absence of font strokes or decimal points is a necessary content, which is a challenge to the detection accuracy of the detection system

2. Due to the large batch of products, the detection efficiency must be guaranteed in order to truly play the role of detection equipment replacing labor. The traditional stop operation mode is difficult to meet the needs of efficient detection

3. With the strengthening of drug supervision by the National Drug Administration Department, electronic supervision code is an inevitable trend in the printing of medical labels. Relying on manual or simple printing detection system can not complete the detection of supervision code at all

the main reason is that the electronic supervision code is unique, and each label is different. At present, the detection equipment on the market mostly relies on the method of comparing with the standard image for detection, which cannot be used in the electronic supervision code part

III. application status of domestic pharmaceutical label detection equipment

visual label detection equipment has entered China for nearly a decade. Some foreign-funded daily chemical label printing enterprises first brought foreign detection equipment into China through the channel of setting up factories in China. After that, the large-scale label printing enterprises in China gradually began to choose similar testing equipment out of consideration of competition and other factors. However, the application of foreign testing equipment in the field of electronic and pharmaceutical labels with high quality requirements is relatively small. The main reason is that the requirements of electronic, pharmaceutical and other industries for label quality are quite different from those of daily chemical labels. In terms of detection accuracy, special defects and detection efficiency, foreign equipment can not better meet the needs of domestic users

after 2007, the market share of domestic label detection equipment has exceeded 60%, becoming the mainstream. At present, in the domestic pharmaceutical label printing industry, the market share of domestic equipment has reached 90%, and domestic equipment has been widely accepted

in the traditional quality control process, the detection of printing quality depends on human eyes. There are two disadvantages: one is that the manual detection is affected by factors such as mood, physical health, fatigue and the interference of the surrounding environment, and the detection standard cannot be well grasped and implemented. One of the quality control is that the tensile fixture accounts for about 80% of the total fixture, which is poor; The second is that for some special defects (such as some defects on reflective and transparent materials), it is difficult for the human eye to find them when observing at a fixed position, and it is necessary to constantly adjust the observation position or viewing angle direction to find these defects, which increases the degree of artificial fatigue and makes it more difficult to ensure the detection results. Many printing enterprises contacted by the author, because of the pressure of customer complaints, the quality inspection department had to adopt the method of manual multiple tests of the same product to ensure the test results, but the effect was not ideal due to the instability of manual testing and other factors

from the perspective of equipment performance characteristics, the domestic medical label detection equipment represented by Daheng image mainly meets the needs of users in three aspects: fine defect detection, electronic supervision code recognition and phase detection, and equipment application efficiency. First of all, in view of the high requirements of medical labels for small defects such as words and dirty spots, domestic equipment can achieve a detection accuracy of up to 0.04mm, which fully meets the defect detection requirements of the lowest specification products of medical label printing enterprises, and its detection accuracy has reached the limit of human observation. It fully ensures the precise requirements of medical labels for numbers and words. Secondly, electronic supervision code is a common concern in medical labels at present. The currently developed electronic supervision code detection module can not only identify the barcode and number of electronic supervision code, but also have the function of variable data area quality detection. This function meets the quality requirements of high-end pharmaceutical label customers for electronic supervision codes. In addition, in view of the prominent problems of many downtime and low efficiency of offline label detection, domestic equipment has also introduced a variety of downtime modes such as single point and review. Through the long-term actual test of customers, the flexible defect treatment mode of domestic equipment can improve the detection efficiency by more than 50% compared with similar equipment. This makes the domestic testing equipment have a better input-output ratio, and further reduces the threshold of equipment use

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