Machine Vision & Web Inspection

their products faster, leading to a significant number of grade changes on their laminating machines. To stay efficient, you have to be able to

Label stock quality control leaps forward P

roducers of self-adhesive label stock are busy responding to the growing demand and supplying

produce the needed grade according to its specifications as quickly as possible. Quality control plays an integral role in ensuring the desired quality, lowering costs and reducing waste. Valmet has more than 50 years of

experience from thousands of quality control system deliveries for pulp, paper, board and tissue production. The Valmet IQ Self-Adhesive Laminating Solution is based on this extensive know-how. Now, using its automation, measurement and quality control know-how on laminating machines, the latest solutions include Valmet IQ measurements, scanners, profilers, quality controls, as well as process and quality vision solutions – all designed to boost the quality of the label stock.

MACHINE VISION DETECTS DEFECTS An important element in this solution is Valmet IQ Process and Quality Vision.


Consisting of the IQ Web Inspection System (WIS) and IQ Web Monitoring System (WMS), it detects quality defects and identifies their root causes. WIS is a tool to inspect adhesive and silicone defects, laminate and unwinding. It provides new information to reduce the origins of web defects, thereby optimising efficiency. With its cameras, WMS monitors unwinding and coating stations, and detects possible adhesive void and streak defects, as well as process issues. The new Valmet IQ Web Inspection System,

launched in May 2019, uses intelligent 8K camera technology, which combines the best features of an area scan (matrix) camera and line scan camera technologies. More sensitive and reliable defect analysis can be achieved with multigeometry. Replacing the camera beams with one unit results in cost-efficient, compact installation and lower service needs. Unique lighting technology enables the detection of print- critical defects that have not been visible before. This illumination provides excellent opportunities for 3D defect contrasting. Particularly longitudinal structures and oil stains, for example, which are often hard to detect with standard lights, are also

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quality measurement system makes it possible to connect data from both these sources making it is easier to troubleshoot and find root causes.

WATER LEVEL AND CURL CONTROL WITHOUT STEAM Compared with other solutions on the market, its moisturising concept is unique. With today’s fast laminating machines that run over 1,000 m/min, you usually need several steamboxes and conventional moisturisers. Valmet has developed a solution with which all this equipment can be replaced by IQ Moisturizer, enabling control of both the water level and curl without steam. Finally, Valmet IQ Direct Silicone and IQ

Adhesive Measurement, together with IQ Converting Scanner, play a major role in Valmet’s solution to ensure accurate sheet quality measurements on silicone liners. 

highlighted. Precise detailed defect classifications can be made by means of the MIDA (Multiple Image Defect Analysis) and the latest software algorithms based on artificial intelligence principles. Combining a camera-based system with a

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