Wax Coating Machine: Selection Guide for Hot Melt Wax Coating Applications
Wax coating machines apply molten wax to paper, paperboard, and other substrates to provide moisture resistance, grease resistance, and heat-sealability. While similar in principle to hot melt adhesive coating, wax coating operates at lower temperatures and viscosities, requiring different equipment specifications.
This guide covers wax coating applications, machine specifications, and selection criteria. For adhesive coating, see our Hot Melt Coating Machine Ultimate Guide.
What Is a Wax Coating Machine?
A wax coating machine melts solid wax (typically 80–120°C), pumps it to a coating head, and applies it uniformly to a moving substrate. The wax solidifies on cooling, forming a continuous barrier film.
Key Difference from Hot Melt Adhesive Coating
| Factor | Wax Coating | Hot Melt Adhesive Coating |
|---|---|---|
| Viscosity | 50–500 cPs | 2,000–50,000 cPs |
| Operating temperature | 80–120°C | 150–180°C |
| Primary function | Barrier / moisture resistance | Bonding / adhesion |
| Coating weight | 5–30 g/m² | 2–200 g/m² |
| Pump type | Low-viscosity gear pump | High-viscosity gear pump |
Key Applications
- Food packaging paper: Burger wrap, candy wrap, fast-food packaging
- Paper cups & bowls: Waterproof and greaseproof coating
- Industrial moisture barrier: Corrosion protection wrapping
- Floor wax coating: Industrial and commercial flooring
- Corrugated board: Water-resistant coating for shipping containers
Wax Coating Machine Specifications
| Parameter | Typical Range |
|---|---|
| Coating width | Up to 1,200 mm |
| Line speed | 10–150 m/min |
| Wax temperature | 80–120°C |
| Coating weight | 5–30 g/m² |
| Substrate types | Paper, paperboard, corrugated board |
| Coating method | Gravure, roll, or slot die |
Wax Types for Coating
Paraffin Wax
- Lowest cost, general-purpose
- Melting point: 50–70°C
- Best for: standard food packaging, paper cups
Microcrystalline Wax
- Higher flexibility and heat resistance
- Melting point: 70–90°C
- Best for: premium packaging, industrial barrier
Blended Wax Formulations
- Custom blends for specific barrier, gloss, or heat-seal requirements
- May include EVA or other polymers for improved performance
- Best for: application-specific optimization
Selection Criteria
- Substrate type and grammage: Paper vs paperboard vs corrugated
- Coating weight requirement: Typically 5–30 g/m²
- Line speed: 10–150 m/min depending on wax and substrate
- Wax type: Paraffin, microcrystalline, or blended
- Coating method: Gravure for patterned, roll for uniform, slot die for precision
- Temperature control: ±2°C recommended for consistent viscosity
→ Compare coating methods: slot die vs gravure vs roll vs spray
FAQ
What is the difference between wax coating and hot melt adhesive coating?
Wax coating uses low-viscosity wax (50–500 cPs) for barrier and moisture-resistant properties, while hot melt adhesive coating uses higher-viscosity polymers (2,000–50,000 cPs) for bonding. Wax coating requires lower temperatures (80–120°C vs 150–180°C) and different equipment configurations. See our pillar guide for hot melt adhesive coating.
Can a hot melt coating machine be used for wax coating?
In some cases, yes — but modifications are required. Wax has much lower viscosity than hot melt adhesive, so the pump, hose, and die must be sized for low-viscosity fluids. Temperature control range must also be adjusted downward.
What is the difference between paraffin and microcrystalline wax?
Microcrystalline wax offers higher flexibility and heat resistance. Full comparison in our Wax Coating Application Deep Dive.
Can wax coating be used for corrugated board?
Yes — wax coating improves water resistance for shipping containers. Learn more in our 10 Wax Coating Applications article.
What line speed is achievable with wax coating?
Typically 10–150 m/min depending on wax type and substrate. Details in our Wax Coating Deep Dive.
Is wax coating suitable for food contact?
Yes — food-grade paraffin and microcrystalline waxes are approved for indirect food contact. See our Wax Coating Application Deep Dive.