Surface pre-treatment and electrostatic spraying process flow of fire rated doors

Title: Enhancing the Durability and Performance of Steel Fireproof Doors through Advanced Surface Treatment and Electrostatic Powder Coating Processes.Surface pre-treatment and electrostatic spraying process flow of fire rated doors

Surface pre-treatment and electrostatic spraying process flow of fire rated doors Abstract:
This paper presents a comprehensive study on the optimization of surface treatment and electrostatic powder coating processes for steel fireproof doors, focusing on the China fire door factory’s implementation of multi-door access systems. The study introduces an innovative preparation of anti-bending sand-grain powder coatings, aiming to significantly improve the mechanical strength, adhesion, corrosion resistance, and aging resistance of fire doors. The methodology encompasses a detailed examination of the process flow, from pre-treatment to the final inspection, highlighting the critical role of each stage in achieving superior coating quality and durability.Surface pre-treatment and electrostatic spraying process flow of fire rated doors

1. Introduction:
   The demand for high-quality steel fireproof doors with enhanced safety and longevity features has led to the development of advanced manufacturing processes. Among these, the surface treatment and electrostatic powder coating processes play pivotal roles. This paper delves into the process optimization at a leading China fire door factory, which specializes in the production of steel fireproof doors equipped with multi-door access systems. The focus is on the preparation of anti-bending sand-grain powder coatings for fire doors, a novel approach aimed at providing superior protection against fire and physical deformations.Surface pre-treatment and electrostatic spraying process flow of fire rated doors
2. Methodology:
   The process flow for the surface treatment and electrostatic powder coating of steel fireproof doors is outlined as follows: pre-treatment → electrostatic powder spraying → heating and curing → cooling and inspection before transitioning to the next process. The principle of the electrostatic spraying process involves using electrostatic powder spraying equipment to apply powder coating to the workpiece’s surface. Under the influence of static electricity, the powder uniformly adheres to the surface, forming a coating layer that, after high-temperature curing, results in a final coating with variable effects depending on the powder coating type used.

2.1 Process Steps and Techniques:

• Pre-treatment: The workpieces are immersed in a phosphoric acid bath for 20-30 minutes to remove oil and rust. After removal, they are soaked in a water bath for 3-5 minutes, followed by air drying. A secondary pre-treatment involves wiping the door surfaces with a “four-in-one” pickling solution to ensure thorough cleaning.
• Electrostatic Powder Coating: This step involves checking the pre-treatment quality, preparing the coating equipment, and applying the powder coating. The electrostatic voltage settings, flow pressure, and atomization pressure are optimized to ensure uniform coating application and minimize material wastage through an efficient recovery system.
• High-Temperature Curing: The coated products are hung on a rack and placed in a curing oven. The temperature is gradually and uniformly increased to between 180-210°C, maintaining this high temperature for 20-25 minutes to ensure effective curing.
• Cooling and Inspection: After curing, the products are cooled to room temperature and inspected for any defects, such as missed spots, pinholes, or inadequate adhesion. The coating thickness is measured to fall within the optimal range of 0.04-0.07mm.Surface pre-treatment and electrostatic spraying process flow of fire rated doors.

1. Results and Discussion:
   The implementation of the optimized surface treatment and electrostatic powder coating processes has demonstrated significant improvements in the durability and performance of steel fireproof doors. The anti-bending sand-grain powder coatings have shown exceptional results in enhancing the doors’ resistance to bending, corrosion, and aging, thereby extending their lifespan and operational reliability.
2. Conclusion:
   The study underscores the importance of advanced surface treatment and electrostatic powder coating processes in the manufacturing of steel fireproof doors. The China fire door factory’s focus on the preparation of anti-bending sand-grain powder coatings represents a significant leap forward in fire door technology, offering enhanced safety and durability for multi-door access systems. This research contributes valuable insights into the continuous improvement of fireproof door manufacturing processes, setting a new standard for the industry.

Keywords: China fire door factory, multi-door access systems, steel fireproof doors, anti-bending sand-grain powder coatings, electrostatic powder coating.