What are the difficulties to overcome to make a super large fire door?
As we all know, public buildings must be equipped with fire-fighting facilities, especially places with a large flow of people, while large-scale buildings such as large hotels, exhibition centers, and commercial centers must be equipped with fire-resistant doors that are larger than ordinary specifications, that is, super large fire-proof door.
It is very difficult to make super large fire doors, which is different from ordinary fire doors with hundreds of years of traditional craftsmanship. Due to the large size, once the design is not good, it will be deformed, the hinge will be bent, the door closer is not strong enough, and the door frame will sag.
Therefore, the requirements for design, structure, key raw materials and production technology of super large fire doors are much higher than those of commonly used specifications. The super large fire doors produced by most fire door manufacturers fail to meet safety standards.
Each super large fire door must undergo strict production, burn inspection, and acceptance before it can be installed and used.
The oversized fire doors of national landmark projects such as the G20 Summit, the BRIC Conference, and the Shanghai Cooperation Summit are undoubtedly the industry’s first security standards.
So, what difficulties have to be overcome to make a super large fire door?
One, burn test
First of all, from the perspective of the size's influence on the burn-in inspection, as the size of the fire door increases, the difficulty in the burn-in inspection will increase geometrically. This is why there are 945 fire door manufacturers across the country, but not many have obtained the production qualifications for super-sized fire doors. The vast majority of enterprises fail to burn inspection due to their inability to overcome related technical problems in the production process. Among the enterprises that have obtained the production qualification for super large fire doors, more than half have only the certificates within 3000mm, and there are only 3 enterprises each with 3000mm and 4000mm and more than 4000mm, and these are only the production qualifications for ordinary steel doors.
Second, burn-in after adding decorative surface
Secondly, from the perspective of the influence of surface technology on burn-in inspection, after adding decorative surface, the probability of passing the burn-in inspection of fire doors will be greatly reduced. So far, only Junge has successfully overcome technical difficulties and become the nation's first An enterprise that has obtained the 3C certificate for the oversized steel-wood fireproof door and the oversized steel-wood fireproof door with copper finish.
Add a bit of industry knowledge: Obtaining the 3C certificate of ordinary steel oversized fire door is equivalent to just a component of the certificate of the steel wood with copper veneer fire door—steel fire door core (steel fire door is It is the 3C certificate of the inner filling material, and the difficulty coefficient of the door core burn-in is far lower than the overall burn-in difficulty after adding the decorative surface.
Three, product consistency requirements
Furthermore, in terms of the particularity of fire-fighting products, fire-fighting products must meet the consistency requirements. For example, oversized steel-wood fire-resistant doors with copper finishes are made of steel door cores, flame-retardant wood panels, copper finish panels and hardware accessories. According to the former Fire Product Qualification Assessment Center of the Ministry of Public Security (now the Emergency Management Department Fire Product Qualification Assessment Center), 'Building Refractory Components Product Implementation Rules' page 42, Appendix B: Factory Product Consistency Control Requirements and Mass Production Product Consistency Regulations' The factory should take corresponding measures to ensure that the mass-produced certified products are consistent with the type test qualified samples in at least the following aspects:
1. The product name, specification and model indicated on the nameplate, logo, manual and packaging of the certified product;
2. The structure, size and installation method of the certified product;
3. The main raw materials and key parts of the certified products
In view of this, the almost harsh combustion testing and qualification certification, coupled with the acceptance standards that are so strict that you cry, the super fireproof door is really not something that ordinary door companies can play. And then, it will only be stricter. At present, the relevant state departments are tightening the production control of large-size fire doors and promulgated production standards for large-size fire doors. Enterprises who want to produce large-size fire doors must pass the qualification review and obtain the corresponding qualifications.
As a result, it is impossible to produce oversized fire doors without qualifications. After all, when it comes to large-scale security, the country's tight control is natural. Although the remaining qualified enterprises are not many, they are all professional and reliable. This is naturally good for the market.