Dynamic Surface Tension Measurement in Liquid Curtain Coating Systems
Dynamic surface tension at millisecond surface ages dictates liquid curtain stability and dynamic wetting limits in paperboard coating operations.
DIN 53122
Vapor Specification
Technical specifications for determining the water vapor permeability of plastic films and paper provide a benchmark for packaging performance. The din 53122 establishes the gravimetric method for assessing how well a material resists the movement of moisture under specific humidity and temperature gradients. This standard is used to qualify barrier boards for dry food packaging and industrial liners.
Testing Protocol
Procedures defined in the document require the use of a test dish containing a desiccant, which is sealed with the sample material and placed in a controlled environment. Technicians measure the increase in weight of the dish over several days to calculate the mass of water that has passed through the substrate. This data is expressed in grams per square meter per day.
Accuracy depends on the maintenance of a constant air flow and temperature within the climate chamber.
Barrier Validation
Results from this test allow manufacturers to compare the efficiency of different coating formulations or laminates. A low permeability value indicates that the material will protect moisture-sensitive products during long-term storage. Converters use these figures to guarantee the performance of their products to end users.
The standard provides a reliable way to verify that a production batch meets the required quality levels.