emco Elektronische Mess- und Steuerungstechnik GmbH Robert Beltz Mommsenstrasse 2 04329 Leipzig Deutschland +49 341 27146-0

emco DDPM - Dynamic Expansion Module

emco DDPM is a modular accessory for the emco DPM. It suites for the high-dynamic measurement of expansion and absorption capacity.

The expansion module 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.

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. The measurement with the emco DDPM enables determination of wet stretch with adjustable preload. This makes it possible to measure the sample as it requires the characterization of the paper.


  • Measurement with two-sided or one-sided liquid contact of the sample
  • Measurement with millisecond resolution over user defined test cycle times
  • Simultaneous measurement of expansion and ultrasonic transmission
  • Measuring of the dynamic of the expansion (%) under low, variable prestressing
  • Compatible with emco DPM accessories (cell inserts for special liquids, heating)
  • Interface to PC (COM) and software for data presentation
  • Variable dimension of sample (effective measuring area: max. 50 x 50 mm)


  • Together with emco DPM for the first time a standardized measurement method for characterizing the dynamic behavior of paper
  • Direct determination of expansion in contact with liquids (water, glue, coating colour, ...)
  • Research & development and quality control for: Decor paper, poster paper, wallpaper, speciality papers and all papers in further processing


Brochure emco DDPM