The following points should be noted when cooking wooden fire doors: The moisture content of the wood to be flame retardant is an important factor affecting the flame retardant quality of the wood. Because dry wood tends to absorb flame retardant liquid more easily after entering the flame retardant pool, and the amount of flame retardant liquid absorbed by the wood directly affects the flame retardant quality of the wood. The amount of absorption is proportional to the oxygen index and flame retardant depth of the flame retardant wood. The more the wood absorbs the flame retardant liquid, the better the flame retardant performance, the higher the oxygen index, and the deeper the flame retardant depth. However, many companies believe that wood will be soaked by flame retardant liquid when it is flame retardant, so the moisture content of the wood does not matter much. The wood that needs to be flame-retardant will generally not be dried, and some companies will even perform flame-retardant treatment on freshly sawn wet wood. Not knowing the moisture content of the wood will only affect the flame retardant quality, causing the flame retardant quality of the flame retardant wood to be unstable. According to tests, under the same flame retardant conditions, compared with wood with a moisture content higher than 40%, the oxygen index of wood with a moisture content lower than 15% can be increased by more than 5, and the flame retardant depth can be increased by more than 3mm.

What is the function of fire doors?

Fire doors are doors that meet fire stability, integrity and thermal insulation requirements in a room. It is a fire protection zone with a certain fire resistance limit, located in fire protection zones, evacuation stairwells, shafts, etc. In addition to the functions of ordinary doors, fire doors also have the function of preventing the spread of fire and smoke. They can prevent the spread of fire in a room and ensure the evacuation of personnel. # # # Fire doors are one of the measures for fire separation in buildings. Usually used in firewalls, stairwell entrances or pipe well openings, where smoke and fire are required to be isolated. Fire doors play an important role in preventing the spread of smoke and fire and reducing losses. Fire doors are divided into normally closed fire doors and normally open fire doors according to their open status. Normally closed fire doors are usually closed by a door closer. Therefore, when a fire occurs, it can prevent the spread of smoke; normally open fire doors are usually opened under the action of a door closer. When a fire occurs, the automatic release switch automatically closes the fire door closer under the action of the door closer and the sequence device.

Fire doors are divided into the following categories, 30-90 minutes

Class A fire door

1. The highest level of fire separation (firewall, fire partition, etc.)

2. Doors of crowded places (cinema, auditorium, etc.). )

3. Important warehouse doors (confidential rooms, archives rooms, etc.)

4. Fire equipment doors (transformer room, distribution room, etc.). )

5. Doors of important equipment unrelated to fire protection (air-conditioning rooms, freezing rooms, etc.). )

Class B fire door

1. Open the door to the safety exit (enclosed stairwell, smoke-proof stairwell, front room, etc.). )

2. Rooms and doors of entertainment buildings (KTV, entertainment halls, etc.). )

3. Rooms or places with high fire risk (kitchens in public buildings, warehouses attached to civil buildings, etc.)

4. Rooms (places) used by vulnerable groups (operating rooms, delivery rooms, etc.)

5. The same functional control scale partition (hospital nursing unit, etc.)

6. Equipment room (fire control room, etc.)

7. The distance between doors and windows on both sides of the fire partition wall is insufficient. Alternative measures

8. For residential buildings larger than 54m and smaller than 100m, each household must have a room door with a refuge function room and an external window.

Class C fire door

1. Shaft protection (pipe doors, etc.)

2. Internally connected doors and some doors of equipment rooms (transformer rooms, etc.) that open to the outside. )

Debugging requirements for fire doors

1. Normally closed fire doors that are opened manually from either side of the door should close automatically. When a signal feedback device is installed, the switch status signal should be fed back to the fire control room.

2. Be sure to open the fire door. After the fire detector on either side alarms, it should be automatically closed and the closing signal should be fed back to the fire control room.

3. Be sure to open the fire door. After receiving the manual closing instruction from the fire control room, it should automatically close and feedback the closing signal to the fire control room.

4. Be sure to open the fire door. After receiving the on-site manual closing command, it should automatically close and feedback the closing signal to the fire control room.

Common flame retardant methods for wood include: spraying, soaking, cooking, vacuum, vacuum pressurization, etc. Generally, spraying and soaking methods are used on the surface of wood that is no longer planed, and flame retardant treatment is performed on sheets with a thickness less than 10mm, but it is not suitable for making wooden fire doors. Although the vacuum method and vacuum pressure method have excellent flame retardant effects, they are not used by some fire door manufacturers due to expensive equipment.