TEST METHOD

A known volume of liquid (e.g. synthetic urine) is automatically and at constant rate discharged through the centre hole of the LISTER electrode plate onto the sample of nonwoven coverstock. A timer is activated as soon as the electrically conductive liquid passes the electrodes. The nonwoven sample is placed onto a set of  standardized filter papers, which serves as the absorbent core. After the liquid has penetrated into the absorbent pad, the electrical circuit is interrupted, the timer is stopped and the liquid strike-through time is displayed. The turntable moves to present the next nonwoven sample to the LISTER measurement unit.
Standardized according to INDA/EDANA WSP 70.3 and WSP 70.7.

BENEFITS

• Multi-sample
  High-volume testing is made easy by means of a rotating plate, which presents up to five single samples successively to the integrated LISTER unit.
• Fully automatic
  Once the samples are positioned, LISTER AUTO conducts the liquid strike-through measurement entirely automatically.
• No manual test liquid handling
  For each single test, the needed amount of test liquid is discharged automatically. This ensures controlled liquid feed with reduced operator influence.
• Repeated test made easy
  In cases where the repeated liquid strike-through test is part of the routine, LISTER AUTO ensures a consistent and reliable measurement process while also saving time: The integrated timer regulates the interval between specified single measurements and eliminates any variability caused by manual timekeeping. Additionally, the fully automatic procedure frees up time for other tasks.
• Efficient and cost-saving
  The fully automatic liquid dosing- and measurement procedure means that less time is spent for the liquid strike-through measurement, the need for personnel resources is reduced and cost savings can be achieved.
• Objective results
  The high degree of automation ensures objective, accurate and reproducible results without any human impact on the test outcomes.
• Standard setting
  For more than 40 years, Lenzing Instruments has set the standards when it comes to determination of liquid strike-through properties of nonwovens. Lenzing Instruments is a partner of EDANA for the liquid strike-through measurement.
• Supplier of filter paper
  The needed standardized filter (blotter) paper can be acquired from Lenzing Instruments

TEST STANDARDS

INDA/EDANA WSP 70.3, WSP 70.7