china steel doors: production line

Now china doors factory and manufacturer is glad to introduce production process of china steel doors to you.

1. make design of steel door: press the steel board by press machine;The press machine stamps the design on the steel surface. The design of steel door begins from this.

2. Cut the steel board into right size according to requests of customers.

3. Punch the lockset hole,peephole hold of steel door leaf.

4. Bolt the steel board into door frame.

5. Electronic weilding.

6. Polish the steel board to make it smooth.

7. Chemical treatment. Mainly two steps: acidification and phosphatization. The acidification can wash the steel rust, the phosphatization can make the steel door acid resistance and will not rust.

8. Close the door leaf together and put infillings inside.
Honeycomb paper is filled between the two steel sheets. It is the most common infillings for steel doors. The other infillings used commonly by our European customers are rock wool (fireproof material) with a steel framework between the two steel sheets. The rock wool is not only fireproof, but also has a good ability in anti-sound.

9. Powder coating and heat transfer printing. It is powder coating. Before painting, it’ll be polished. So it can be much better powder coated.

Then do you see the natural wood skin? Yes, the natural wood skin is transferred from this paper. Polish, glue, cover the paper to the door surface, then hinge the door through special oven. The temperature of oven is more than 180 centigrade. When it is out, wash the paper off. Then the natural wood skin is now transferred to the door surface. One of steps is bighting. It can make the surface more shining, never fade.

10. Light, to make the door leaf surface more brighting.

11. Cover the film to protect the surface from dust and scraching.

12. assemble the door leaf and door frame together.

13. China steel doors' packing.1 piece per carton; packed by plastic bubbule bag and firm carton suitable for long-time sailing on the sea.

Doors artical 10

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