Introduction to Fireproof Coating Production Equipment

Introduction to Fireproof Coating Production Equipment

Fireproof coatings play a critical role in passive fire protection systems, helping to prevent the rapid spread of fire and protecting structural components from reaching critical failure temperatures. The demand for high-quality, consistently performing fireproof coatings has driven the development of specialized production lines that combine precise material handling, efficient mixing, and advanced automation. A modern fireproof coating production system integrates raw material processing, accurate weighing, mixing and dispersion, and finished product packaging into an automated production setup dedicated to large-scale, standardized manufacturing of various fireproof coatings, ensuring stable product performance and efficient, environmentally friendly production.

Core Production Process

Fireproof coatings are broadly divided into waterborne intumescent coatings and solvent-based formulations. Expanding (intumescent) coatings, which are among the most widely used passive fire protection measures, expand when heated to many times their original thickness, forming an insulating char layer that acts as a barrier between the fire and the substrate. The typical manufacturing process follows a well-defined sequence:

Raw material weighing → Pre-mixing → High-temperature extrusion (120–160 °C) → Cooling and flaking → Precision grinding → Grading and sieving → Finished packaging

This process is predominantly a physical mixing procedure that does not involve chemical reactions, ensuring stable and reproducible product characteristics.

Key Equipment Components

A complete fireproof coating production line consists of several interconnected systems:

1. Material Storage and Feeding System

Raw materials, including resins, fillers (such as expanded vermiculite and perlite), and fire retardants, are stored in dedicated silos or tanks. Materials are transported to the batching station via bucket elevators or pneumatic conveying systems. Vacuum feeders, controlled by three-port valves, transport powder materials through hard piping to storage silos while dust collectors capture airborne particles to purify the air.

2. Precise Weighing and Batching System

High-precision sensors integrated with PLC control automatically weigh each raw material according to the formulation. The system controls batching errors to a minimum, ensuring batch-to-batch consistency. Two main weighing methods are employed: reduction method batching (for high-viscosity materials) and incremental method batching (for low-viscosity materials).

3. Dispersion and Mixing System

This is the core of the entire production line. Depending on the formulation and required dispersion quality, several equipment options are available:

• High-speed disperser — A highly efficient machine for mixing and dispersing liquids and solids, widely used in paints, inks, pigments, and adhesives. High-speed dispersers typically feature 360-degree rotation, stepless speed regulation, and hydraulic lifting. Heavy-duty models are equipped with TEFC or explosion-proof motors, V-belt drives, and stainless steel wetted parts.For hazardous environments containing flammable vapors or dusts, explosion-proof high-speed dispersers are mandatory.

• Double planetary dispersing mixer — Particularly suitable for high-viscosity fireproof coatings (up to 500,000 cps). The planetary mixing head rotates on its own axis while revolving around the mixing tank, providing thorough mixing and eliminating dead zones. The hydraulic lifting mechanism allows easy tank transfer and is ideal for automatic material feeding. The planetary structure achieves superior mixing uniformity for two-component fireproof materials and has been successfully deployed in large-scale coating manufacturing operations with multinational partners.

• Ploughshare mixer and twin-shaft mixer — Used as primary mixing equipment for dry powders and pastes, providing preliminary blending before more intensive processing.

4. Milling and Grinding Equipment

For fireproof coatings requiring fine and uniform particle size, vertical or horizontal sand mills are commonly used. A complete fireproof coating mixing and grinding multi-processing system may include multiple sand mills connected in series, screening machines, and collection tanks to achieve the desired fineness. The grinding process is critical for ensuring the uniform dispersion of fire retardant additives, such as expandable graphite and metal hydroxides.

5. Extrusion, Cooling and Flaking Unit

For powder-based fireproof coating formulations, a twin-screw extruder operates at elevated temperatures (120–160 °C) to homogeneously incorporate flame retardants and heat-resistant fillers, followed by a cooling and flaking press that solidifies the molten material into manageable flakes for subsequent grinding.

6. Filling and Packaging System

The packaging unit is equipped with weighing-type filling machines, capping units, and conveying rollers. These machines are applicable for packing fire-retardant coatings, alkyd paints, emulsion paints, epoxy paints, and various other industrial fluids. Advanced models feature dust extraction systems that prevent powder leakage during the filling process—a common environmental and health concern in coating manufacturing. Weighing accuracy typically reaches ±0.2%, with filling capacities ranging from 10 kg to 50 kg per container. For plastic drums and steel drums, interchangeable capping devices are available.

7. Control System

Modern fireproof coating production lines employ PLC + touchscreen control systems that support formula management, data traceability, fault alarming, and even semi-autonomous operation. The control system, often incorporating Siemens PLC hardware and industrial HMI panels, enables batch parameter storage and real-time monitoring.

8. Environmental Protection Auxiliary System

Given the dust and fume generation during powder handling and mixing, environmental systems including baghouse dust collectors, waste gas treatment devices, and noise reduction designs are integrated to improve working conditions and meet green manufacturing requirements.

Quality Control and Standards

Quality assurance is integral to fireproof coating production. Routine factory inspections assess the material state, fineness, viscosity, drying time, and bending resistance. Type testing, performed under specific circumstances such as new product launches or production transfers, evaluates the full range of product specifications.

International standards such as ASTM E2924 provide consensus recommendations for the manufacturing, testing, labeling, transportation, delivery, storage (including shelf life), application, and inspection of intumescent coatings. Leading manufacturers must comply with ISO 9001 and CE certification requirements to ensure equipment safety and product quality.

Industry Trends and Applications

Recent years have witnessed significant technological advancements in fireproof coating production. Nano-enhanced additives, such as carbon nanotubes, graphene, and expandable graphite, are being incorporated into formulations to improve fire resistance performance.Sustainable manufacturing practices, including recyclable binder systems and reduced solvent emissions, are increasingly prioritized. The collaboration between SIEHE Group and JOTUN Paints in 2025 marked a milestone in delivering high-precision fireproof coating production equipment verified against German engineering standards.

Applications of fireproof coatings span multiple industries, including steel structure passive fire protection in high-rise buildings, cable tunnels in infrastructure projects, offshore platforms in the oil and gas industry, and industrial facilities requiring enhanced fire safety. The move toward greater automation and intelligent process control continues to drive innovation in production equipment design, enabling manufacturers to meet increasingly stringent safety and environmental regulations while maintaining cost efficiency and product consistency.