Fecha de publicación: 12/01/2023 Fuente: Wipo Milk or dairy products The invention relates a method for detecting, in particular automatically, portions of adhesive (65) on packaging materials for producing packages for products, in particular smokable products, specifically during the production of the packages in an apparatus, in particular in a packaging machine, for producing these packages. The invention is characterized by the following steps: a) in a surface region (70) of the packaging material in which a portion of adhesive (65) is expected at the time of the measurement, a first height profile (73a) of the packaging material surface is measured, in particular with a measuring sensor, b) in a surface region (72) of the packaging material in which no portion of adhesive (65) is expected at the time of the measurement, a second height profile (73b) of the packaging material surface is measured, in particular with a measuring sensor, c) the two measured height profiles are used to determine a difference height profile (76), corresponding to the difference in the two height profiles, or dependent thereon or derived therefrom, in particular by an evaluation device of the apparatus for producing the packages, d) the difference height profile (76) is analysed, in particular by a or the evaluation device, to ascertain whether it contains an elevation representative in particular of the presence of a portion of adhesive (65).