TEST METHOD

The WETBACK test is performed in connection with a liquid strike-through test with LISTER AC. Subsequently, a defined amount of liquid is applied on the prepared sample consisting of a nonwoven coverstock placed on top of a standard absorbent medium. Thereafter, the integrated simulated baby weight of WETBACK is automatically lowered onto the specimen. The lowering of the baby weight is accomplished with an by INDA/EDANA accurately defined speed. The weight remains on the sample for a specified period of time to ensure even spreading of the liquid. A pre-weighed special filter paper i.e. pick-up paper is then placed onto the nonwoven coverstock and the weight is again lowered onto the specimen. Consequently, by means of an electronic balance, the amount of liquid is determined, which, due to the load, is passed back through the specimen’s surface into the pick-up filter paper. The weight of the liquid absorbed by the pick-up paper is defined as wetback. Standardized according to INDA/EDANA WSP 80.10.R3 (12.) and WSP 70.8.

BENEFITS

• Highest reproducibility
  The automated Test principle guarantees for objective, accurate and reproducible testing for reliable results.
• Internationally acknowledged
  WETBACK is standard setting when it comes to determination of the rewet/wetback properties of nonwovens. Hundreds of units are in use all over the world.
• Standard setting
  Lenzing Instruments is official partner of INDA/EDANA for the wetback measurement.
• Supplier of filter paper
  The needed standardized filter (blotter) paper can be acquired from Lenzing Instruments.

TEST STANDARDS

INDA/EDANA WSP 80.10.R3 (12.), WSP 70.8.