PACKAGING MATERIAL WITH IMPROVED BARRIER EFFECT

Abstract

A packaging material is shown comprising a base paper and a first and a second coating, wherein the base paper has a basis weight of at least 30 g / m² and at most 90 g / m², wherein the first coating is located between the base paper and the second coating, forming a barrier against oxygen penetration, and comprising a polymer having hydroxyl groups, wherein the hydroxyl groups of the polymer are at least partially cross-linked, and wherein the second coating is applied directly to the first coating, forming a barrier against water vapor penetration, and comprising a polymer and a wax, wherein the packaging material, on the side to which the first and the second coatings are applied, has a Bekk smoothness of at least 800 s and at most 20,000 s, and wherein the mean water vapor permeability M of the packaging material is at least 2.0 g / (m² × 24 h) and at most 100.0 g / (m2 × 24 h), and the following formula applies to the standard deviation s of the water vapor permeability: s≤M⋅(0.15+0.1⋅e−0.003⋅M2), where the mean water vapor permeability M and the standard deviation s of the water vapor permeability in g / (m2 × 24 h) are to be inserted into the formula.