[China Aluminum Network] The quality of oxide film can be detected by the following methods:
1. View colors. The surface of pure aluminum that has been formed into an oxide film is milky white, cast aluminum, and mixed aluminum are grayish black. The surface without oxide film is transparent and bright white, and some also have pink or gray-black hanging cream.
2. Measuring resistance. Oxidation film has been detected with resistance and is not conductive at normal pressure. Non-oxide film can conduct electricity when detected.
3. Scratches, the surface of the oxide film that has formed is very hard, slipping when scratched with a needle, no scratches, the surface without oxide film is very soft, there are resistance and scratches when scratching with a needle.
4. Hearing sounds a crisp sound when the oxide film has been formed, and a muffled sound when the oxide film is not generated.
5. Coloring test. Oxide films can be quickly colored in the dyeing solution, and no oxide film is dyed in the dye solution.
Industrial sectional doors are the most durable and longest lasting doors to ensure circulation at the areas of the factory entrance and exit of goods, loading and unloading areas.
The body of sectional door is forming by 40 mm sandwich panels. These panels provides sound and heat insulation due to the intense doped polyurethane insulation was injected between galvanized steel sheet. (50 kg/m3).
Industrial sectional door systems provide space-saving with opening parallel to the ceiling.Any opening can be used clearly . and produces in accordance with the transition range and the height in the factory buildings or warehouses.
Doors is working sliding by be the most appropriate the gap between the top level of the gate with a ceiling height within the side rasils. The door can be mounted in different ways according to the gap distance (standard, low, highlift and vertical track systems).
Industrial sectional doors can easily be opened automaticly by 230-380 V-AC/50 Hz electric motor or manualy thanks to torsion spring system that balances the weight of the door.The galvanized springs are made to be durable of 25.000 door cycles.Motor with emergency chain All the drive systems have a mechanical back-up system fitted to the reduction gearbox of the electric motor, so that the sectional door can be opened if the power fails. The reduction gearbox can then be powered using the chain.
Industrial Sectional Door,Industrial Overhead Sectional Door,Industrial Warehouse Sectional Door,Industrial Garage Interior Sectional Door
Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.highspeedshutterdoor.com