Acquisition distribution layer (ADL) is the non woven material sandwiched between the top sheet and the absorbent core layer, and its function is to accelerate the penetration and diffusion of liquid and reduce the liquid infiltration. ... Then, it is absorbed and stored by the absorbent core under pressure and gravity.
They are also known as Acquisition and Distribution Layer abbreviated as ADL. It is a intermediate layer used between the top polypropylene non-woven sheet and the absorbent core . These may be used in full length or as a patch near the urine deposit zone. This layer gets significance only in thin/ultra thin Diapers, due to its property of moving the liquids quickly into the absorbent core and hence reducing the potential leakage.
The ADL gives some dry feel to the skin, because it provides an additional separation between the wet pad and the skin. ADL's are made of either trough air bond (TAB) non woven or of an aperture sheet (i.e.,made of perforated plastic film). Cheaper diapers may sometimes use the resin bonded non woven, but they give poor performance when compared to TAB non woven.
ADL made by hot air non woven fabric, someone call it as quick wicking layer.
The top-sheet is the layer drawing moisture into the diaper and allowing liquids to pass through, to keep the baby’s skin dry. Moreover, polypropylene fibers, obtained by the melt-blown process, brings softness and comfort to that part of the diaper in the direct contact with the baby’s skin. Acquisition layer or veil underneath the top-sheet that allows a good distribution and diffusion of the liquid. The absorbent core (AC) is the main part of the baby diaper structure, it keeps moisture and liquids away from the baby’s skin to maintain it dry and healthy. This layer typically consists of a mix of the SAP and fluff pulp. SAP is the common ingredient in all baby diapers, which has the property of absorbing and retaining liquids in just a few seconds. Fluff pulp is a naturally occurring cellulose material that absorbs moisture. The backsheet is the outer part of the diaper. It prevents moisture from transferring to the baby’s bed or clothing. It is made of polyethylene and polypropylene inner wrap to provide softness and comfort. Additional elements comprise features principally designed to guarantee a good fit for the diaper. Such as outer polyethylene films, flexible elastics, adhesives, and lotions. Outer polyethylene films are repositionable straps that are soft and allow the diaper to fit snugly to the baby. They are made of polyethylene fibers and polyurethane foam that provide softness and flexibility; for more comfort for the baby. Flexible elastics running on both sides of the absorbent body, allowed the diaper to adapt to the baby’s morphology, around his legs, it may also include tensioned elastically extensible materials to allow more comfort, and to prevent lateral leaks. Adhesives are used to hold the diaper’s components together and prevent leaks. The lotion is an optional content that protects the baby’s skin and helps reduce the risk of diaper rash, a patented protective balm is applied to the upper layer of the diaper. The additional components may differ depending on the diaper style, the producer, and consumer preference. In some diapers, colorants or perfumes may be added as aesthetics. To sum up, analyzing the composition and material present in diapers is important for their efficacy absorption assessment.
ADL is applied in the manufacture of sanitary napkins, panty liners and incontinence pads.no matter diaper making process or sanitary pads making process.