Road paint, often used for surface markings like lane lines and crosswalks, is primarily applied using a specialized process involving heat and spraying.
The application process typically involves heating a thermoplastic material to a high temperature until it melts, then applying it to the road surface.
The Application Process Explained
Applying durable road markings involves precise steps to ensure longevity and visibility. A common method utilizes thermoplastic material, which is applied hot and cools rapidly to form a robust layer.
Key Steps in Thermoplastic Road Marking Application
- Heating the Material: The thermoplastic material, usually in a powder form, is loaded into a hot melt kettle.
- Melting the Powder: Inside the kettle, the material is heated to a high temperature. According to common practice, it is heated to 200 °C (392 °F) to fully melt the powder into a liquid state.
- Application to the Road: The molten material is then applied to the prepared road surface, often by spraying.
- Cooling and Curing: Once on the road, the hot material cools and solidifies quickly, forming a durable marking.
Properties of Applied Thermoplastic Markings
After cooling, the applied material forms a thick polymer layer. This layer is designed to be:
- Wear-resistant: Capable of withstanding heavy traffic.
- Bright: Highly visible during the day.
- Reflective: Often includes reflective beads embedded in the surface to enhance visibility at night.
Summary Table: Thermoplastic Application
| Step | Equipment Used | Temperature | Method | Result |
|---|---|---|---|---|
| Heating & Melting | Hot Melt Kettle | 200 °C (392 °F) | Heating | Molten Thermoplastic Material |
| Application | Sprayer (Common) | High Temp (Molten) | Spraying | Applied Liquid Marking on Road |
| Solidification | N/A | Cooling to Ambient | Cooling | Thick, Durable, Reflective Layer Forms |
This process ensures that road markings are not just painted lines but resilient surface features critical for traffic guidance and safety.
