What Is Slot Die Coating?
Direct Answer
Slot die coating is an adhesive application method that extrudes a continuous, flat film of hot-melt adhesive through a narrow slot onto a surface.
Key Takeaways
- Slot die coating is an adhesive application method that extrudes a continuous, flat film of hot-melt adhesive through a narrow slot onto a surface.
- How it works: Hot-melt adhesive is pumped through a slot die opening of fixed width, laying down a uniform coating on the film or nonwoven surface passing beneath.
- Laminating breathable film to nonwoven backsheets
- Slot die coating wastes adhesive — it actually deposits a controlled uniform layer, reducing waste vs spray in full-coverage applications
How Slot Die Coating Works
Hot-melt adhesive is pumped through a slot die opening of fixed width, laying down a uniform coating on the film or nonwoven surface passing beneath. It gives even coverage and precise width control for backsheet lamination.
Examples and Applications
- Laminating breathable film to nonwoven backsheets
- Applying full-width adhesive to pad bases
Slot Die Coating vs. Related Terms
| Term | What it is | Key difference |
|---|---|---|
| Slot Die Coating |
Limitations and Common Misconceptions
- Slot die coating wastes adhesive — it actually deposits a controlled uniform layer, reducing waste vs spray in full-coverage applications
When is slot die coating used instead of spraying?
When full, uniform coverage is needed (for example laminating sheets together), slot die coating is efficient; spraying is better for open, breathable or targeted patterns.
References
- JP CIA (industry) - Baby diaper material: key components and their functions — 行业媒体 (accessed 2026-08-02)
- EDANA - What are nonwovens? (ISO 9092 / CEN EN 29092 definition) — EDANA (accessed 2026-08-02)