1、 Core functions and design requirements
1. High airtightness
-Using special sealing structures such as EPDM rubber sealing strips, silicone sealing rings, inflatable seals, etc., to ensure that there is no gap between the door leaf and the door frame.
-Through airtightness testing (such as differential pressure method), it meets clean room standards such as ISO 14644 and GMP.
2. Material selection
-Door material: Stainless steel (304/316L), non flower hot-dip galvanized steel plate, aluminum alloy and other corrosion-resistant and easy to clean materials.
-Surface treatment: Smooth without dead corners, avoiding dust accumulation, usually using antibacterial coating or electrolytic polishing.
3. Automatic door closing and pressure control
-Equipped with door closers or automatic sensing systems (such as infrared sensors and foot touch switches) to ensure timely door closure.
-Support positive or negative pressure environments to prevent air backflow (such as maintaining negative pressure in biosafety laboratories).
4. Clean compatibility*
-Dust free design reduces the dust generated by the door itself.
-Optional embedded observation window (double-layer tempered glass) for easy observation without compromising sealing.
2、 Common types
1. Sliding airtight door
-Horizontal sliding opening saves space and is suitable for narrow passages.
-The track needs to be sealed to prevent dust accumulation.
2. Flat opening airtight door
-Traditional hinge type requires more precise sealing strips, suitable for areas with extremely high air tightness requirements.
3. Quick rolling shutter door
-High frequency opening and closing scenarios (such as logistics channels), combined with airtight design, but attention should be paid to edge sealing.
4. Interlocking airtight door
-Double door interlock system ensures that the two doors do not open simultaneously, maintaining stable pressure in the clean room.
3、 Key technical parameters
|Parameter | Description|
|Sealing grade | Compliant with ISO 14644-3 (leakage rate test) or EN 1634 (fireproof airtight door standard)|
|Pressure difference | usually 30~150Pa (according to cleanroom pressure requirements)|
|Door thickness | 40~100mm (hollow filled with insulation and sound insulation materials)|
|Opening and closing speed | adjustable, suitable for different pedestrian/logistics needs|
|Fire rating | Optional A-level fire protection (such as biosafety laboratory)|
4、 Key points for installation and maintenance
1. Installation requirements
-The door frame needs to be seamlessly welded to the clean room wall or filled with sealant.
-The design of ground guide rails should avoid dust accumulation, and some door types use trackless suspension technology.
2. Daily maintenance
-Regularly check the wear and aging of the sealing strip and replace it in a timely manner.
-Use dust-free cloth and specialized cleaning agents during cleaning to avoid corrosion of sealing materials.
-Check the sensitivity of mechanical components such as sensors and door closers.
5、 Examples of applicable scenarios:
-* * Pharmaceutical factory * *: Prevent cross contamination and comply with GMP standards.
-Operating room: Maintain positive pressure and block external microorganisms.
-Semiconductor workshop: Control nanoscale particles to ensure a safe production environment.
-BSL-3/4 Laboratory: Negative pressure sealing to prevent pathogen leakage.
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###6. Common Problems and Solutions**
-Problem 1: Aging of the sealing strip leads to air leakage**
→ Regularly replace EPDM or silicone sealing strips that are resistant to chemical corrosion.
-Problem 2: Door deformation affects sealing performance**
→ Choose high stiffness materials (such as stainless steel reinforcement structure).
-Question 3: Automatic sensing failure**
Select anti-interference sensors to avoid interference from high-frequency equipment in the clean room.
