14 AMETEK Smart defect detection
for better board quality The elimination of quality claims for the premium paperboard that Metsä Board was making in Sweden was behind the addition of final-stage inspection for quality control supplied by Ametek
B
ased in Finland, Metsä Board is a leading European producer of premium paperboards.
The company operates at several sites, including an integrated board and pulp mill at Husum in Sweden, which produces folding boxboard, food service board, uncoated white kraftliner, and extrusion coated board as well as kraft pulp. It operates two board machine lines (BM1 and BM2), a coating machine (CM1) and extruder (EM1). Inspection systems are essential
for all quality sensitive paper and board products, so Metsä Board has been using them at its operations for many years. The mill switched production from paper to board in 2016, and existing surface inspection systems were upgraded at the same time. Dealing with three layers of
board, BM1 had been using Ametek Surface Vision’s SmartView system with 26 cameras. This was upgraded in 2015-16, and then replaced in September 2020 with a new SmartView system. A 26-camera SmartAdvisor system was added in 2011, along with the SmartSync system to combine web inspection and web monitoring. This was also upgraded in 2015/16. Also in 2015-16, a SmartView
system was installed on the CM1 coating line, adding top and bottom surface inspection. This was used to detect coating problems such as blade scratches and wrinkles on either surface,
July/August 2021
This year at Metsä Board’s Husum mill, Ametek will install a 20-camera SmartAdvisor system and the WIS-system shown will be upgraded to SmartView 8
using linescan technology. In 2021, a 20-camera SmartAdvisor system will be installed and the WIS-system will be upgraded to SmartView 8.
In search of continuous product quality Metsä Board was looking to minimise or eliminate quality claims on board leaving the Husum mill, ensuring that a 100 per cent inspected product leaves
the factory, and consistently meeting customer satisfaction requirements. To accomplish this, the company
wanted a stable solution that would be easy to use and maintain. This would monitor the processes to ensure continuous product quality, with excellent detection results. Polyethylene (PE) coating, as
delivered by the EM1 extruder line, is the most challenging
application, requiring the most complex installation. EM1 required high-resolution detection on both surfaces – the top side is glossy while the reverse side has a matte finish. Low- and high-angle detection was required to detect even small spots, dents, streaks and coating problems. A significant proportion of the final product is used in applications such as cups, plates and food packaging, so is likely to come into direct contact with food or beverages. The quality of the PE coating is important to ensure the board is resistant to grease and water. The end product needs to be 100 per cent defect-free to meet customer expectations. The EM1 is the last process that adds value to the product, so defects identified here provide information for the final decision on what material is shipped to customers. EM1 operates at a speed of 300-400 metres per minute, with an inspection area of 3,600mm, so a system that provided accurate defect detection and classification for those parameters was essential.
An integrated, reliable solution Metsä Board has had experience with many technologies and suppliers of web inspection and web monitoring systems. The company approached Ametek Surface Vision to supply a system, based on positive experiences with existing equipment,
Pulp Paper & Logistics
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