Metal doors and windows, plastic doors and windows must be installed before leaving the wall to leave the hole, and then the door and window are installed in the hole, it is strictly prohibited to install the side of the hole or the first door and window after the wall. This is due to two reasons:
1. On the one hand, metal doors and windows and plastic doors and windows are not the same as wooden doors and windows. Except for solid steel doors and windows, they are all fasting, and the door and window materials are thin, such as hammering or extrusion, which may cause local bending and damage;
2. On the other hand, the metal door and window surface has a protective decorative film or anti-rust coating. If the protective decorative film is worn, it is difficult to repair; if the anti-rust coating is worn out, it will not be repaired in time, and it will lose its anti-rust. effect;
Therefore, in order to ensure the quality of the door and window installation and the effect of use, it is necessary to first install the door and window after the hole is built. Metal doors and windows are often connected to the wall by nailing, expansion bolts or welding methods. The nail must have a solid wall. The wall must be built first. When the door and window are installed, the wall is solid. If the wall is built, the wall can not bear the impact of the nail. If the expansion bolt is installed, the hole must be drilled on the solid wall. For example, if the wall is built, the hole cannot be drilled; the welding is required to pre-embed the connecting steel plate on the wall. For example, it is difficult to pre-embed the steel plate after the wall is built. [ Follow the WeChat public account "Jiuzhengmen Window Network"; pay attention to courtesy, scan code to send millions of business opportunities! Jiuzhengmen window network exchange group ]
Metallographic Polishing Cloth
Cloth wheel polishing the main material is cloth, used for polishing the mechanical wheel. Polishing cloth wheel, material linen, cotton, non-woven cloth, flannelette, denim, miscellaneous cloth and linen wheel, nylon wheel, emery wheel, used for all kinds of polishing tools.
Performance: this kind of product is generally made of cotton twill and cotton cloth cut, strong sewing force, strong grinding force. Specification: according to the size provided by customers. Usage: this kind of product is usually used for grinding, even polishing, but also need to depend on the workpiece material and product quality requirements, can not be generalized. For example: the workpiece material hardness is low can also be rough grinding, polishing quality requirements are not very high, can also be used as polishing, etc..
Metallographic Polishing Cloth,Metal Polishing Cloth,Buffing Machine Tools,The Grinder Machine
TROJAN (Suzhou) Technology Co., Ltd. , https://www.trojanmaterial.com