In the multi-layered architecture of a modern diaper, the core wrapping tissue (also known as core wrap or core enveloping paper) is perhaps the most overlooked component. Tucked inside the chassis, it serves as the protective barrier that encases the absorbent core. Without this thin layer of tissue paper, the Superabsorbent Polymer (SAP) particles—the tiny gel-forming granules responsible for liquid retention—would have direct access to the topsheet and, consequently, to the wearer's skin.
Why Core Wrapping Matters
In the initial design of the absorbent core, SAP is either mixed with fluff pulp or applied in layers. While this structure maximizes absorption capacity, it also creates a risk: the SAP particles are small, and when dry, they can migrate. During manufacturing, transport, and even in the package, mechanical agitation can cause SAP to shift. If the core is not fully enclosed, dust or granules can escape the core and sit against the topsheet.
Once outside the core, wet SAP granules can swell and form small gel balls directly against the skin. This not only creates an uncomfortable "gritty" feeling for the user but also increases the risk of skin irritation. The core wrapping tissue acts as a physical barrier, trapping the SAP within the core throughout the diaper's shelf life and during use. This ensures that skin contact remains with the soft, non-abrasive topsheet material rather than the powerful but less skin-friendly SAP.
⭐How Different Materials Perform
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Nonwoven (wetlaid): In the premium diaper segment, wetlaid nonwoven is the material of choice. It offers a soft surface, excellent porosity, and sufficient structural integrity to hold the core together during use.
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Nonwoven (airlaid): Often used in high-end Adult Diapers, airlaid offers the best combination of porosity and softness. However, it comes at a higher cost.
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Tissue paper: The most basic and economical option. Low-basis-weight tissue paper is common in budget diapers, but its tendency to lose strength when wet can lead to core failure.
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Perforated film: Occasionally used, this material combines a film barrier with perforations for liquid entry, helping to keep the core dry.
Where Things Can Go Wrong
When the core wrapping tissue is improperly designed, several problems arise:
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SAP dusting: If the tissue has insufficient basis weight or pore size, fine SAP particles escape. Even a small amount on the skin can cause friction irritation.
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Delayed absorption: Poor porosity slows the ingress of liquid, increasing the risk of leakage.
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Tissue rupture: Weak wet tensile strength causes the wrap to disintegrate once wet, allowing the core to break apart and causing discomfort.
Conclusion
The core wrapping tissue might be hidden from plain sight, but its function is anything but minor. It creates a reliable seal around the absorbent core, ensuring that SAP does its job without ever touching the skin. For procurement professionals, evaluating the basis weight, porosity, and wet strength of the wrapping tissue is as important as evaluating the core itself.
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