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A core wrap is quite common when diaper producers utilise a core matrix design that includes a combination of fluff and superabsorbent polymer (SAP). The wrap’s main job is to keep the fluff/superabsorbent polymer (SAP) matrix contained within the core, both when dry and after insult.

There are two types of core wraps manufacturers typically use today:

  • Nonwoven wraps have faster absorption but do not reduce the risk of leakage due to core cracking.
  • Tissue wraps have slower absorption but are known for helping active users stay drier. They reduce rewet and hold up better against core cracking. 

Keeping the SAP and fluff in place within the core creates a more comfortable fit for the wearer. It also allows for improved performance during use. Some cores contain more fluff than others (e.g., 50% or greater). As diaper producers reduce the amount of fluff (a current trend to reduce the weight of the diaper core and make it thinner), the need for a core wrap may increase.


Hot-melt adhesives support core stability and function

Adhesives can play multiple roles in the production and performance of wrapped core designs. They are used to seal the core and bond adjacent materials. In addition, a core integrity adhesive helps to enable diaper designs with less fluff.  Because of the reduced number of fluff fibres to hold the SAP powder in place, the SAP can be lost when transferring the core from the drum to backsheet. Adhesive minimises SAP loss and keeps it evenly distributed to maximise performance and comfort. 
If you are looking to modify your core design, reduce the quantity of fluff, or even change your core wrap material, talk to us. Your choice of adhesives can make all the difference in meeting consumer needs as efficiently as possible. 

I want to learn more about core wraps from a Bostik expert.