Automatic Wet Expansion Tester for 3 Testing Standards

The new emco NDT Wet Expansion tester for paper realizes a dynamic measuring principle for the determination of the wet stretch course. The testing of wet stretch of paper is relevant for the assessment of the material behaviour in manufacturing process as well as in application only when a dynamic measurement procedure is used.
The expansion measurement of a paper sample can be performed in different test liquids. In combination with immersion and expansion time the application process can be optimally simulated.
Expansion of paper caused by liquids means the swelling of the fibers by absorption of liquid. Thereby paper fibers swell less in machine direction than in cross direction. Equivalent results arise from wet stretch measurements at standard climatic conditions (23 °C, 50 % rH) and defined counterweights (Fenchel, Mütek CD, Mütek MD).