Aquisition and distribution layer (ADL)
ADL is the second layer in a diaper. It ensures even distribution of liquids so that the diaper's absorbent core will not be overloaded at certain point.
Truetzschler Nonwovens offer two technologies for manufacturing the acquisition and distribution layer. These two processes can even be flexibly combined in one production line:
- the carding/thermobonding process works with bicomponent fibers. It is similar to top sheet production but uses coarser fibers to melt in a drum thermobond oven or
- the chemical consolidation of a carded web made of fibers of different fineness with a chemical binder.
Core and back sheet
The ADL layer is followed by the core, which usually consists of cellulosic fluff pulp with embedded superabsorbent particles. In contact with liquids, they swell up like a gel and bind the liquid in the core.
The diaper's outer layer is called the back sheet. It usually consists of a water-impermeable film, which is laminated with thin, soft nonwoven material to protect the film. A calendered spunbonded fabric or a hydroentangled carded nonwoven can be used.