The blade of a cutter knife is very sharp, and there are several parallel scribe lines on its blade. Because it is usually used to cut wallpaper, it is also called a "wallpaper cutter". Cutter knife is usually used in the decoration and advertising plaque industry. The biggest feature of the cutter knife is that it can be easy to replace the segmented blades. You can fold off the unsharp section of blade when using it, so the sharpness can be maintained without sharpening the blade frequently.
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China's energy-saving signs for building windows and doors are under the control of the Ministry of Construction. The identification of the former batch will be issued in June of this year. The pilot cities started include four municipalities and cities with regional representativeness and enthusiasm. We will strive to achieve phased pilot results by the end of this year and promote it nationwide next year.
The logo includes:
1. Full window (door) airtightness (air penetration) detection.
2. The whole window (door) heat transfer coefficient test.
3. The entire window (door) visible light transmittance, shading coefficient detection.
4. The whole window (door) heat transfer coefficient simulation calculation.
Using the simulation software developed by the Lawrence Berkeley National Laboratory for therm5 and window5, the heat transfer coefficients of the glass system, each node of the frame, and the entire window (door) were calculated. Its purpose: to quickly evaluate the heat transfer coefficients of different windows (doors) without the need for production samples, optimize the design, reduce the waste of resources from the source, and reduce the detection costs of production companies.
At present, after 11 national thermal engineering simulation units, after many experiments and simulations, by adjusting the boundary conditions, the simulation values ​​are very similar to the door and window test values. Therefore, the door and window thermal engineering simulation values ​​can be used as the evaluation of the door and window levels. Reference.
Building doors and windows to reduce energy consumption, reduce heat transfer coefficient, and improve insulation performance are the focus of current door and window technology research. Beijing's requirement for the heat transfer coefficient of doors and windows is 2.8W/m2K. Then, if ordinary insulating glass (5+12A+5) is used, what are the existing two types of aluminum alloy heat insulation methods (wearing bars, plastic injections)? The configuration can achieve the requirements of building doors and windows energy-saving logo?
Window5 software was used to simulate common insulating glass (5+12A+5) using the adjusted boundary conditions. The K(U) value is 2.677 W/m2K.
The two nodes at different positions of the 63 mm strip-in-open window (24 mm PA strip) were modeled using Therm 5 and the K(U) values ​​were 2.7388 W/m2K and 2.7548 W/m2K. Using the Window5 software, the standard window (1500 x 1500) was simulated and the K(U) value was 2.755 W/m2K.
It is the two nodes of different positions of the 58mm injection window (18.9mm PU), and the box profile is simulated using Therm5. The K(U) value is 2.4232W/m2K and 2.6100W/m2K.
Using Window5 software, the standard window (1500 x 1500) was simulated with a K(U) value of 2.698 W/m2K.
To sum up, in order to improve the insulation performance of the aluminum alloy heat insulation window, the width of the heat insulation material must be increased. European designers in Germany increased the width of thermal insulation strips and added hot melt strips at both ends of the thermal insulation strips in order to ensure the strength of the insulation material and aluminum alloy profiles. When the heat insulating material is heated and baked in a later process, the hot melt adhesive firmly binds the aluminum alloy material and the nylon material, which increases the shear strength of the heat insulating material and ensures the watertightness of the heat insulating material. Sex.
U.S. designers recommend that when insul- In this way, the strength of the heat insulating profile is increased, and it is ensured that any aluminum alloy surface can be ideally bonded with the heat insulating adhesive. Due to the increase of strength, the plastic injection tank can be designed in a small height direction, which saves plastic and aluminum materials and reduces the weight of aluminum alloy.
Two kinds of heat insulation methods (wearing strips, plastic injections) adopt the "occlusion" and "adhesion" in more advanced designs to ensure the high quality of aluminum alloy heat insulation profiles.
Aluminum alloy doors and windows, curtain wall high strength, high precision, stable quality, ideal thermal insulation, low cost, high production efficiency should be the direction of our country's development. 
How heat-insulating aluminum alloy doors and windows meet the building windows and doors to be implemented
[China Aluminum Industry Network] building energy efficiency doors and windows logo first applied to the United States "Energy Star" program, the plan was initiated in 1998 by the United States Department of Energy and Environmental Protection Agency; initially, it is a voluntary guarantee mark. By the end of 2003, more than 220,000 homes had been marked with the "Energy Star".