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Thermo plastic road marking process .


Thermoplastic road marking is one of the most widely used methods for creating durable, highly visible road lines (such as lane markings, arrows, pedestrian crossings, and symbols). The process involves applying a heated thermoplastic material onto the road surface, which cools and hardens into a tough, reflective line.

Here’s the step-by-step process:
1. Surface Preparation

The road surface must be clean, dry, and free of dust, oil, and loose particles.

In some cases, a primer (road marking primer/sealer) is applied to improve adhesion on asphalt or concrete surfaces.
2. Heating the Thermoplastic Material

Thermoplastic is supplied in solid powder or block form.

It is melted in a thermoplastic pre-heater (hot melt kettle) at around 180–220 °C until it becomes a liquid.
3. Application of the Marking

Two main application methods are used:

Screed application: The molten material is poured and spread with a screed box to create a line.

Extrusion application: The molten material is forced through an extrusion shoe, forming uniform lines.

Spray application: Thermoplastic is sprayed on using compressed air, often for symbols or wider areas.
4. Adding Glass Beads

While the thermoplastic is still hot, reflective glass beads are dropped or sprayed onto the surface.

These beads partially embed in the thermoplastic, giving retro-reflectivity (headlights reflect back to drivers at night).
5. Cooling and Hardening

The marking cools within a few minutes, forming a hard, durable, and skid-resistant line.

The road can be opened to traffic shortly after cooling.

Key Properties of Thermoplastic Road Markings

Durable (lasts 2–5 years depending on traffic and climate).

High visibility day and night due to glass beads.

Fast drying compared to paint-based systems.

Thicker layer (1.5–3 mm) than paint, giving better wear resistance .
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