10 Adhesive Coating Head Specifications: Slot Die, Gravure, Roll & Spray Deep Dive

The coating head determines precision, speed, and waste in every adhesive coating line. This deep-dive expands on our Adhesive Coating Machine Types Comparison with ten specification details.

1. Slot Die Precision

Slot die precision (±1–2%) is the highest available in adhesive coating. This precision level is essential for PSA coating of premium labels and medical tape production.

2. Slot Die Speed

Slot die speed (up to 600+ m/min) enables the highest throughput in hot melt coating. This speed matches the requirements of high-speed industrial film coating lines.

3. Slot Die Coating Weight Range

Slot die coating weight range (2–200 gsm) covers nearly every hot melt application. For comparison, wax coating typically operates at 5–30 gsm.

4. Gravure Pattern Capability

Gravure pattern capability enables fine-pattern adhesive deposition impossible with other methods. This is valuable in patterned PSA tape products.

5. Gravure Coating Weight Range

Gravure coating weight range (2–150 gsm) overlaps with slot die but with lower precision. For high-precision requirements, see the slot die specifications in this deep dive.

6. Roll Coating Simplicity

Roll coating simplicity translates to lower capital cost and easier maintenance. This makes it attractive for wax coating operations where precision requirements are moderate.

7. Roll Coating Speed

Roll coating speed (100–200 m/min) is moderate compared to slot die. This speed range suits PUR furniture edge banding lines where precision matters more than throughput.

8. Spray Coating Flexibility

Spray coating flexibility enables coating of irregular surfaces and selective areas. This flexibility is valuable in medical device coating where complex geometries are common.

9. Startup Waste Comparison

Startup waste comparison shows slot die with the lowest waste, gravure with the highest. Waste reduction is critical in high-value PSA adhesive coating.

10. Maintenance Cost Comparison

Maintenance cost comparison favors roll coating (lowest) and slot die (low annual pump service) over gravure (high roll and blade cost). Maintenance planning should align with the film coating defect prevention strategy.

Conclusion

Coating head selection is a balance of precision, speed, waste, and maintenance. For the complete comparison table and decision tree, return to the Adhesive Coating Machine Types Comparison.