As a critical barrier in clean environments, the sealing performance of steel double cleanroom doors directly impacts cleanliness, differential pressure control, and energy efficiency. Achieving efficient sealing requires coordinated optimization across multiple dimensions, including material selection, structural design, sealing systems, installation processes, and maintenance management.
The door material forms the foundation of its sealing performance. Steel double cleanroom doors typically use galvanized steel or stainless steel sheets as the main structure. These materials are characterized by high strength, corrosion resistance, and ease of cleaning, effectively resisting chemical corrosion and mechanical wear within the cleanroom. The interior of the door is filled with flame-retardant honeycomb core material, which not only enhances the overall strength of the door but also reduces heat transfer due to the low thermal conductivity of the honeycomb structure, further mitigating the risk of structural deformation caused by temperature differences and providing stable support for sealing performance.
The design of the sealing system is crucial. Steel double-layer cleanroom doors typically employ a triple-layer composite sealing structure: EPDM sealing strips are embedded around the door frame, their high elasticity and aging resistance ensuring a tight seal between the door and frame when closed; an automatic lifting sweeping sealing strip is installed at the bottom, which automatically descends by gravity or a spring mechanism when the door is closed, filling the gap between the door and the floor, effectively preventing the intrusion of dust and microorganisms; some high-end models also include side sealing strips on the door, forming a comprehensive sealing barrier. This multi-layered sealing design greatly reduces the possibility of air infiltration.
The connection method between the door frame and the wall is equally crucial. The splicing of the door frame and the cleanroom wall (such as color steel plate or brick wall) must use tongue-and-groove joints or special sealant to ensure a seamless seal. During installation, a level and laser positioning instrument must be used to ensure the verticality and horizontality of the door frame to avoid seal failure due to installation deviations. Furthermore, the gap between the door frame and the wall must be filled with fire-retardant and sound-insulating materials, enhancing both the sealing performance and the overall performance of the door.
The importance of detailed design in improving sealing performance cannot be overlooked. Steel double clean room doors often employ antibacterial powder coatings or wood grain heat transfer processes for surface treatment, which are not only aesthetically pleasing and durable but also reduce dust accumulation. The selection of hardware such as door locks and hinges must also consider sealing performance; for example, using 304 stainless steel ensures long-term rust prevention. Door closers should have a buffer function to prevent the sealing strip from shifting due to excessive impact when the door closes. Some medical-grade doors are also equipped with observation windows using a double-layer tempered glass structure with an antibacterial film, ensuring visibility while preventing condensation and microbial growth.
Installation techniques are crucial for ensuring sealing performance. Before installation, precise measurements of the door opening are necessary to ensure a perfect match between the door and the opening. During installation, professional tools are used to adjust the gap between the door leaf and the door frame to ensure even stress on the sealing strip. After installation, a sealing test must be performed, such as a smoke test, releasing smoke to observe for leaks and ensure the sealing effect meets standards.
Maintenance and management are essential for the long-term guarantee of sealing performance. Regularly check the elasticity and integrity of the sealing strips, and replace aged or damaged strips promptly. Clean the door surface and sealing strips to prevent dust accumulation from affecting the sealing effect. Calibrate the stroke of the automatic lifting device to ensure that the sweeping sealing strip can accurately descend and rise. Through scientific maintenance and management, the service life of the Steel Double Clean Room Door can be extended, maintaining its long-term sealing performance.
