What Is Hot Melt Adhesive?
Direct Answer
Hot melt adhesive is a thermoplastic glue applied molten that bonds diaper and pad layers instantly on cooling, used for structure, elastics and tabs.
Key Takeaways
- Hot melt adhesive is a thermoplastic glue applied molten that bonds diaper and pad layers instantly on cooling, used for structure, elastics and tabs.
- How it works: Hot melt adhesive is heated to a liquid, sprayed or coated onto a layer, then bonds as it cools.
- Elastic waistbands are bonded with spray hot melt that stays soft and flexible
- Myth: Hot melt is dangerous for babies. Hygiene-grade hot melt is non-toxic and placed away from skin (Pampers)
How Hot Melt Adhesive Works
Hot melt adhesive is heated to a liquid, sprayed or coated onto a layer, then bonds as it cools. It replaces sewing and is essential to high-speed hygiene production. Variants: spray (fiber/atomized) for soft elastic bonding, slot-die coating for film lamination, and slow-setting types for fasteners. Glue coating weight (1.5-3 gsm) is a key quality metric.
Examples and Applications
- Elastic waistbands are bonded with spray hot melt that stays soft and flexible
- Slow-setting hot melt is used on hook-and-loop fasteners for repositionable bonds
Hot Melt Adhesive vs. Related Terms
| Term | What it is | Key difference |
|---|---|---|
| Ultrasonic bonding | Hot Melt Adhesive | Hot melt uses adhesive; ultrasonic bonding fuses polymer by high-frequency vibration — glue-free alternative |
Limitations and Common Misconceptions
- Myth: Hot melt is dangerous for babies. Hygiene-grade hot melt is non-toxic and placed away from skin (Pampers)
- Myth: More glue means stronger diaper. Over-gluing stiffens the product; precise 1.5-3gsm application is the standard
Is hot melt adhesive safe in diapers?
Yes. Hygiene-grade adhesives are non-toxic, solvent-free and placed away from the skin (Pampers).
How is hot melt applied?
Molten glue is sprayed, coated or extruded onto layers and bonds as it cools — key to high-speed production.
References
- Pampers Official - What's in a Pampers diaper (component materials) — 品牌官方 (accessed 2026-08-02)
- JP CIA (industry) - Baby diaper material: key components and their functions — 行业媒体 (accessed 2026-08-02)