| 摘要 |
The present invention refers to a method for quality classification of different materials such as beams, tubes, sheet units, details of different kinds, and also foodstuffs, which materials are manufactured by wood, plastic, metal, carton, nutritive substances or combinations of these materials, by providing the material with at least one quality mark, which is placed on at least one place on the material somewhere in the manufacturing chain, when the material is manufactured. The material somewhere in the manufacturing chain is provided with at least one secret code, which is sent to and/or is documented in at least one code register (5) together with information about what the quality mark includes or means, which secret code in the code register (5) confirms if the quality mark created during the quality classification is false or genuine. |
