Changing the topsheet is a controlled material change — how to keep feel, skin safety and batch traceability intact
Quick answer: Adjusting the surface material of a pull-up pant — or an adult underpad — means changing the topsheet or its hydrophilic treatment to match a market's preference for feel, dryness and climate. Because the topsheet is the skin-contact layer, the change must be handled as a controlled change: the new material is incoming-inspected, a sample is approved, the specification and artwork versions are updated, and biocompatibility evidence is reconfirmed where the contact material changes. ASL Group (Shandong Aishule Hygiene Products Co., Ltd.) runs ODM programmes inside one ISO 13485 system and produces pull-up pants across four production bases.
A market rarely asks for a named material; it asks for a feel. Translating that into a specification is the ODM's job, and each variable has a measurable effect on the finished pant.
| Variable | What markets ask for | Effect on the product |
|---|---|---|
| Softness | A softer hand for direct skin contact | Comfort and wearer acceptance |
| Hydrophilicity | Faster strike-through, a drier surface | Re-wet and dryness performance |
| Climate fit | Breathability for hot, humid markets | Heat build-up and odour perception |
| Appearance | Print and texture matched to the channel | Listed-pack appeal |
A topsheet change touches the skin, so it is never a silent substitution. The steps below are what keeps a market-ready change from becoming an unverified one.
| Step | Practice | Why it matters |
|---|---|---|
| New material | Incoming inspection against the new specification | Confirms the material before it reaches the line |
| Sample | An approved master for the changed variant | Freezes what "approved" means |
| Specification | Version updated with the material change | Keeps the change traceable |
| Skin safety | ISO 10993 evidence reconfirmed where contact material changes | Protects the market file |
| Batch record | Names the material lot actually used | Ties the shipment to its material |
Surface preference is one of the few things a brand can localise cheaply. Colour, print and hand-feel differ visibly between markets, and a market that dislikes a product's feel rejects it before absorbency is ever judged. Adjusting the topsheet and its treatment lets a brand answer that preference while leaving the expensive part of the product — the core, the cuffs and the fit — untouched.
The discipline that makes this safe is versioning. Each surface variant is registered as a version of the approved master, so a brand's second and third orders still describe the same product. Without versioning, a series of small surface tweaks quietly turns into a product that no longer matches what was originally tested.
The market asks for a feel; the factory answers with a versioned specification. Treated as a controlled change — new material inspected, sample approved, ISO 10993 evidence reconfirmed — a surface adjustment reaches the shelf as the same product the brand approved, in one ISO 13485 system.
Send the feel, climate and channel you are targeting. ASL returns a versioned surface specification with a master sample and the material-change records behind it.