10 Wax Coating Applications: Food Packaging, Paper Cups, Paraffin & Microcrystalline Deep Dive

Wax coating is the low-viscosity cousin of hot melt adhesive coating. This deep-dive expands on our Wax Coating Machine Selection Guide with ten application and formulation details.

1. Food Packaging Paper

Food packaging paper coating provides moisture and grease resistance for burger wrap, candy wrap, and fast-food packaging. The barrier function differs from the bonding function of hot melt adhesive coating.

2. Paper Cups & Bowls

Paper cups and bowls require waterproof coating that withstands hot and cold liquids. The coating weight (5–30 g/m²) is lower than PSA coating weights.

3. Corrugated Board

Corrugated board coating improves water resistance for shipping containers. This application overlaps with the roll coating method used for medium-precision adhesive application.

4. Industrial Moisture Barrier

Industrial moisture barrier coating protects metal components during shipping and storage. The barrier performance requirements are less stringent than medical device coating barriers.

5. Paraffin Wax

Paraffin wax (melting point 50–70°C) is the lowest-cost option for general-purpose coating. Its viscosity (50–500 cPs) is far lower than PUR adhesive viscosity.

6. Microcrystalline Wax

Microcrystalline wax (melting point 70–90°C) offers higher flexibility and heat resistance. This premium performance parallels the UV coating advantage in surface durability.

7. Blended Wax Formulations

Blended wax formulations combine paraffin, microcrystalline, and sometimes EVA for optimized performance. Formulation science is similar to the film coating formulation adjustments for defect prevention.

8. Coating Weight Range

Coating weight range (5–30 g/m²) is lower than hot melt adhesive coating (2–200 gsm). For higher coating weights, see the adhesive coating machine types with slot die capability.

9. Line Speed

Line speed (10–150 m/min) is moderate due to wax cooling characteristics. Higher speeds require the precision cooling control used in PSA coating chill roll systems.

10. Temperature Control

Temperature control (80–120°C) is lower than hot melt adhesive systems. This lower temperature range reduces energy consumption compared to standard hot melt coating.

Conclusion

Wax coating is a specialized segment with distinct formulation, temperature, and application requirements. For equipment specifications and selection criteria, return to the Wax Coating Machine Selection Guide.