Channel cores are an interesting new design that some disposable diaper manufacturers are experimenting with and introducing to their hygiene production lines.
Compared to a regular core, a channel core has longitudinal zones that are free of any absorbent material (channels). They are typically limited to the crotch area.
Channel cores are produced through the use of a modified drum forming system. In the channels, the upper and lower core wrap materials are directly in contact and laminated with adhesive.
Creating channels typically will ensure:
- Better core integrity
- Better fluid and air circulation
- Less bulking and sagging
- Drier skin
An adhesive used in this type of core should support integrity by keeping the superabsorbent polymer (SAP) and fluff (or SAP only) in place as in a regular core. It should also keep nonwoven core wraps securely bonded in the channels so that the structure stays intact, even in a wet environment.
Involving core adhesive experts like Bostik in the early stages of new core development can help you identify the best nonwoven adhesive solutions to meet your design needs faster.