From the first understanding of the profile to the production, understand the basic knowledge of aluminum alloy doors and windows!

Combining with the characteristics of high wall thickness and high alloy composition of the broken bridge, it is suitable for high-end residential quarters of high-rise buildings. It has good resistance to wind pressure and load-bearing and good thermal insulation, so broken bridge windows are also called advanced airtight windows…

So far, compared with other building materials such as plastic steel and aluminum alloy, the price of broken bridge aluminum is surprisingly high. Generally, the price of plastic steel or aluminum alloy is about 200 yuan to 400 yuan per square meter, while the price of broken bridge aluminum is about 600-1200/square meter, which is a high-priced product. So why is Broken Bridge Aluminum so expensive?

First of all, whether it is plastic steel, aluminum alloy or broken bridge aluminum, the cost calculation method is the same, that is, the price of the material is calculated by weight. Taking the largest amount of plastic steel in the market as an example, each square meter of plastic steel products requires about 9 kilograms of plastic steel materials, while the broken bridge aluminum requires 11 kilograms of broken bridge aluminum profiles per square meter. The raw material price of Broken Bridge aluminum is three times that of plastic steel, about 33,000/ton, which means that the cost per square meter of raw materials alone is about 370 yuan. Of course, the prices of different profiles are slightly different, but they will not differ too much.

The second is the difference in hardware accessories. The hardware accessories required for broken aluminum doors and windows need to bear heavier weight and require better sealing effects, so their prices are much higher than plastic steel doors and windows. For example, thirdly, the sealant and waterproof glue for broken aluminum doors and windows require a large amount, and the requirements for glue are high. The sealing between the glass and the frame on the plastic steel doors and windows is done with rubber strips, while the broken bridge aluminum requires high-quality glass glue, and the cost of glue per square meter is about 50 to 80 yuan.

The specification classification and function of door and window glass

When installing plastic steel doors and windows or broken bridge aluminum doors and windows, you can install two layers of glass, you can also choose to install single glass, you can also use double-layer insulating glass, but some consumers do not know the difference between double-layer glass and insulating glass.


1. General single-layer glass division method and float method, the thickness is 4mm or 5mm

2. Double-layer glass is the same as single-layer glass. The difference is that the two layers of glass are separated by a sponge strip, but air will still enter, so there will be fog between the two layers of glass!

3. The difference between hollow glass and double glass is that gas is filled between the two layers of glass, usually air, and then the circumference is sealed with an aluminum frame containing a desiccant (molecular sieve), and PU glue is used for sealing. The effect is very good. It will fog up. Generally speaking, the effective life of insulating glass is 8 to 10 years. During its use, water vapor may penetrate and water droplets may appear. However, this is a long process. According to the national regulations, water vapor appears when hollow glass is used for five years. All can be counted as qualified products. The airtightness and heat preservation performance of hollow glass is very good, mainly due to its special material, it is very easy to distinguish whether the hollow glass is qualified in winter, as long as it is frozen inside and outside, if it is frozen, it will be unqualified.

4.Vacuum glass is rarely seen in the market. Because of the high cost and complicated production process, it is only used in very few places.

The importance of sealant strips and wool strips in plastic steel doors and windows

In the production and installation of plastic steel doors and windows and broken aluminum doors and windows, the most indispensable accessory is the sealing strip. The sealing strips are divided into two types: glass seals (adhesive strips) and tops. The glass sealing strips are used for sealing between the glass and the fan and the frame, and the tops are mainly used for the sealing between the frame and the fan. Sealing strips are generally used to seal between casement windows and top-hung windows, as well as casement windows and sliding windows and other window sashes and glass; sealing tops are generally used for sealing between sashes of sliding windows , Dustproof function.

The installation positions of the tops are generally on the window (door) sash, around the frame sash or on the sealing bridge (wind block) to enhance the sealing between the frame and the sash. The top specification is an important factor that affects the performance of sliding doors and windows and the watertightness, and it is also an important factor that affects the opening and closing force of doors and windows. Oversized tops or high vertical hairs will not only make assembly difficult, but also increase the resistance of doors and windows, especially the initial resistance when opening and the final resistance when closing. If the specification is too small, or the height of the vertical top is not enough, it is easy to fall out of the groove, which greatly reduces the sealing performance of doors and windows. The tops need to be siliconized. The tops of qualified quality have a straight surface, the bottom plate and vertical hairs are smooth, without bending, and there are no pits on the bottom plate, which meets the requirements of 0.20MM.

From the above points, we can see that the sealing tape plays an important role in waterproofing, sealing and energy saving in plastic steel doors and windows and broken aluminum doors and windows. It is soundproof, dustproof, antifreeze, and warm. It must have strong tensile strength, good elasticity, and better temperature resistance and aging resistance. In order to ensure the fastening of the rubber strip and the profile, the cross-sectional structure size of the rubber strip must match the plastic steel door and window profile.

Do plastic steel doors and windows need to use safety glass (tempered glass)? Are there any specific regulations

To answer this question, first of all, let’s understand what tempered glass or safety glass is.

Tempered glass (safety glass) is made by uniformly heating ordinary glass through a glass tempering furnace to bring the glass close to its softening point, and then uniformly cooling it at a corresponding cooling rate according to different thicknesses. This process will generate strong and permanent internal stress inside the glass, and make the inner tensile stress and outer lamination stress of the glass in a stable stress balance. The original physical properties of the glass are changed, the original use performance of the glass is enhanced, and the scope of use is increased.

The pressure and impact resistance of glass products treated by the tempering process is increased by 5-100 times. Tempered glass has high impact resistance, high bending strength (5 times higher than ordinary flat glass), good thermal stability, smoothness, transparency, and Cutting and other characteristics. When it is damaged by a super impact, the fragments are scattered in small particles without sharp edges and corners, so it is also called safety glass.

According to the building standards for doors and windows, it is currently known that it is larger than 1.5 square meters, and the glass for sliding doors and swing doors must be toughened when opening windows above 7 floors. At the same time, according to the owner’s needs, or when building sun rooms, glass roofs, and glass houses, when the top surface needs to bear the pressure of manpower or material resources, tempered glass (safety glass) must be used, or better laminated tempered glass must be used.

Standard aluminum alloy doors and windows: those with a glass area larger than 1.5 square meters, with an elevation of ≤900mm.

Comparison of casement windows and sliding windows in aluminum alloy doors and windows

Sliding windows and casement windows are currently two different window opening methods commonly used in building doors and windows. They have their own strengths when using the same glass and accessories. They are currently more popular and practical in the market. Aluminium alloy window type window opening method. Casement windows refer to doors and windows whose hinges (hinge) are installed on the sides of doors and windows to open inward or outward; while sliding doors and windows mainly refer to doors and windows whose sashes are vertically pushed and pulled left and right in the horizontal direction.

First of all, the difference between casement windows and sliding windows in appearance is mainly in the collocation with the overall style of the building. Casement windows can be made into any line of facade effect because of the greater flexibility of the division. And for large-scale floor-to-ceiling windows, the opening fan only occupies a very small part of the whole window, so it is more suitable for high-end real estate with strict requirements on the overall effect of the building, especially in line with the architect’s pursuit of large-scale, spacious and bright, A building with good transparency and smooth appearance. Sliding windows can only be horizontally pushed and pulled because they can only be opened horizontally, so it is difficult to match the fixed glass of the large partition. Generally, they are more suitable for open factories or rural home buildings with clear horizontal and vertical lines.

Secondly, in terms of the three properties of doors and windows (wind pressure resistance, water tightness, and air tightness), casement windows are generally better than sliding windows. The wind pressure resistance performance of doors and windows depends on the resistance moment of the main force-bearing members of the doors and windows. The larger the section of the profile, the larger the resistance moment, but it is not completely proportional. Casement windows generally have a small profile section, but their main force-bearing members are usually made of assembling materials or vertical materials. These main force-bearing members will be strengthened accordingly during the design process, so their wind pressure resistance performance is better. . The cross section of the sliding window profile is generally larger, and it is reasonable to say that its wind pressure resistance performance should be better, but as long as a little in-depth analysis of the force, the main force member is often the middle fan material, and its upper and lower stiles only rely on pulleys. To withstand the horizontal wind load, the anti-wind pressure performance is generally not ideal. The water tightness of doors and windows depends on the sealing effect of the opening part. Casement windows are generally sealed with rubber strips, while sliding windows are generally sealed with tops. The sealing effect of rubber strips is generally better than that of tops. In terms of air-tightness, two-point locks or sky-earth locks are used to lock and seal the opening fan of casement windows on the market at present, and the sealing effect is better. The sliding windows are generally locked by hook locks or latch locks, and the sealing effect is not ideal. Therefore, casement windows are generally better than sliding windows in three aspects. This is why most high-end commercial and residential buildings choose to use casement windows.

Again, from the price point of view, there is not much difference between casement windows and sliding windows of the same grade, and casement windows are slightly higher than sliding windows. The price of ordinary casement aluminum windows is 200-350 yuan/m2, the price of mid-range windows is 450-600 yuan/m2, and the price of high-end casement windows is generally above 800 yuan/m2. Ordinary sliding doors and windows are generally 150-300 yuan/m2, mid-range aluminum alloy sliding windows are 350-500 yuan/m2, and high-end sliding doors and windows are above 600 yuan/m2.

Finally, analyze from the use of functions: sliding windows are favored by users because of their flexible opening and convenient and simple operation; in contrast, casement windows are generally connected by hinges (hinge), and they are generally opened by handles. There is often no sliding window flexible in operation.

5. In terms of processing and production: sliding windows are generally simple in structure and have no special requirements for equipment, so they are convenient for small workshops or on-site processing and production; casement windows generally use aluminum alloy corners for connection, so they need more A good angle collision machine can produce excellent aluminum alloy casement windows.
 It can be seen from the above points that the performance of casement windows is better than that of sliding windows, but sliding windows are slightly better than casement windows in terms of manufacturing and operation. Comprehensive comparison of the above factors, a large number of casement windows are used in cities.

The thermally insulated aluminum alloy window with broken bridge is an improved type based on the old aluminum alloy window in order to improve the thermal insulation performance of doors and windows. The aluminum alloy profile is divided into internal and external parts by reinforced nylon spacers to block the heat conduction of aluminum. The material and quality of the reinforced nylon spacers directly affect the durability of the thermally insulated and broken aluminum alloy windows. The outstanding advantages of insulated broken bridge aluminum alloy doors and windows are high strength, good thermal insulation, good rigidity, good fire resistance, large lighting area, good atmospheric corrosion resistance, high comprehensive performance, long service life, good decorative effect, and use High-grade aluminum alloy doors and windows with broken bridge partition profiles are the first choice for high-grade architectural windows.

It depends on the materials: the thickness, strength and oxide film of aluminum profiles used in high-quality aluminum alloy doors and windows should comply with relevant national standards. The wall thickness should be 1.2 mm or more, and the tensile strength should reach 157 Newtons per square meter. The strength should reach 108 Newtons per square millimeter, and the oxide film thickness should reach 10 microns.

Insulating glass is to seal two or more glass edges together, forming a static dry gas between the glass, and has a certain vacuum performance. The main materials are aluminum alloy spacers, angle bolts, butyl rubber, polysulfide rubber and desiccant. Hollow 5+9+5 is about 70-80 yuan/m2. The insulation of insulating glass is that the polysulfide glue it uses can prevent water vapor from penetrating; butyl glue can stick to two pieces of glass to make it tightly sealed; aluminum alloy partition There is a desiccant in the strip to absorb moisture.

How to check the installation quality of doors and windows

1. Window surface: The window frame should be clean, flat and smooth, with no scratches or bruises on the large surface, and no cracks in the profile.

2. 2. Hardware: The hardware must be complete, in the correct position, firmly installed, flexible in use, and able to achieve their respective functions.

3. Glass sealing strip: The contact between the sealing strip and the glass and the glass notch should be smooth, and no curling or detaching of the groove is allowed.

4. Sealing quality: When the doors and windows are half closed, there is no obvious gap between the fan and the frame, and the sealing strip on the sealing surface should be in a compressed state.

5. Glass: The glass should be flat, installed firmly, and there should be no looseness. Single-layer glass should not directly touch the profile. The inner and outer surfaces of double-layer glass should be clean. There should be no dust and moisture in the glass interlayer, and the partition should not be tilted.

6. Beads: Beads with sealing strips must be tightly attached to the glass. There should be no obvious gaps between the bead and the profile, and the joint gap should be less than or equal to 1 mm.

7. Assembling material: The assembling material should be tightly connected with the window frame, and at the same time sealed with caulking paste, without shaking, the screw spacing should be less than or equal to 600 mm, and both ends of the lining reinforced steel should be firmly fixed to the opening.

8. Switch components: flat, sliding or rotating windows should be closed tightly.

9. Frame and wall connection: The window frame should be horizontal and vertical, and the height should be the same. The distance between the fixed pieces should be less than or equal to 600 mm. The frame and the wall should be firmly connected. The gap should be filled with elastic material and the surface should be sealed with joint paste without cracks. . 10. Drain hole: The position of the drain hole should be correct and unobstructed at the same time.


How to identify the quality of windows?

At present, the quality of windows produced on the market varies greatly. How to identify its pros and cons? It can be observed mainly from three aspects, namely, profile, hardware accessories, and processing technology.

1. From the aspect of profiles, the surface finish of the profile, the rationality of the cavity structure, the wall thickness of the profile, and the rationality of the profile are all criteria for measuring the quality of the profile.

2. 2. From the perspective of hardware accessories, the distinction between their advantages and disadvantages mainly depends on their flexibility, sealing, wear resistance and corrosion resistance. The main consideration for accessories is the lining steel placed in the profile cavity. A good lining steel should be galvanized A3 steel with a wall thickness of at least 1.2 mm.

3. From the perspective of processing technology, the quality of the doors and windows depends on the quality of the appearance of the doors and windows, the accuracy of the processing dimensions, the level of corner strength, and the rationality of the use of hardware accessories.
Basic requirements for workshop production quality

In order to improve workshop production quality and project schedule issues, and strengthen personal awareness of quality, the following regulations are specified:

Material incoming and outgoing

1. Unload materials to materials and workshops. First of all cooperate with the warehouse to check the model and quantity. Pay attention to surface protection, stack them neatly and classify them.

2 The workshop picks materials. Strictly follow the material requisition issued by the process, cooperate with the warehouse, and do not take it randomly. Once it is found that the profile does not match, it should be communicated in time.

Production and operation


1. Cut the material. The blanking staff must check the quantity and model after receiving the material requisition and nesting list. The size of the blanking allows a tolerance of ±0.5mm, and the two ends of the profile are not allowed to have burrs. If you need to saw the angle, check whether the angle is accurate. After the operation is completed, focus on the maintenance and maintenance of the equipment, and do a good job of sanitation and cleaning.

2. It is strictly forbidden to operate blindly, and pay attention to the protection of the visible surface (spraying surface) of the profile.

3. Semi-finished products should be stacked neatly and lightly to prevent size disorder and material mixing.

4. Punching materials. The punching personnel firstly understand the process sheet and the correct opening direction, understand the performance of the punch, prevent the deformation and direction of the profile, the allowable size is less than 1mm tolerance, and the pass rate is more than 99%.

Five lines are drawn. First, understand the structure and logo size of engineering drawings and large-scale drawings. The spraying profiles are not allowed to be drawn with hard objects. If you use it, you should ensure that the surface of the semi-finished product is free from scratches and beautiful. If it is found that there is an error in the craft bill, it should be reported in a timely manner, and it is not allowed to make changes in private.

6. groups of corners. The corner staff should check the actual size and angle behind the corner. The length and angle of the leather strip, and the corresponding drainage holes should be milled out of the outer frame. Coat corner glue or color glue evenly on all four sides before assembling. The equipment in front of the corner assembly should be debugged with waste or short materials, and mass production can be organized only after the debugging is correct. Clean up the remaining glue around the corners in time, and review the diagonals. The leather strips need to be glued to the angle and placed neatly to prevent water seepage, and illegal operations are strictly prohibited.

7. assembly. The basic requirements for the assembly of the outer frame and the inner fan are to check the matching of accessories, and the screws must be assembled and assembled according to the process requirements. The outer frame must be reinforced with reinforcing sheets, and it is not allowed to be missed. Check the size and accessories before assembling, and operate the diagonal line according to the regulations, and the batch can be assembled and produced without errors.

8. Packaging. Before packing, check whether you use plastic dust-proof board or plywood. The protective film is required to be in place. Leave 5mm on the three sides of the outer frame, put the bread to the side, do not come off all around, and then tie it up in sections with large tape. The protective film must be stuck to the profile. If it does not meet the requirements, it will be reworked unconditionally, resulting in a waste of time and punishment. In addition, Consider whether the protective film sticks to the profile.

9. Gluing. After the inner fan frame is assembled, pay attention to whether the glass has front and back sides, whether the width dimension and the diagonal are wrong, the diagonal is allowed <1mm tolerance, the width of the glue on both sides should be uniform, to ensure the straightness, and the corners of the surroundings should be coordinated with the straight line. The glue surface is smooth and full. There should be many contact surfaces between the glue and the profile, and the glue should be repaired after it dries. If the inspector finds that it does not meet the requirements, the rework will be punished due to large batches.

10. loading. Transportation is also a major part. Due to improper loading, the product will be scrapped and the appearance will be affected. Once it happens, it will be held accountable. When loading the vehicle, it is required to protect the finished product, and the parts of the vehicle body shall be tied with cardboard or wood, and the appropriate space shall be used for loading.

Production schedule and arrangement

1. Complete on time according to site requirements or process requirements, ensure quality and quantity, and prevent unqualified products from leaving the factory.

2. Obey the arrangements and scheduling of superior management leaders.

3. Civilized production and keep it tidy.

The above key points are hoped that all members of the workshop will take them seriously, strict requirements, processing operation details, and each processing and production will be inspected by the next process. We hope that the above work will be actively cooperated and implemented after the announcement.

Post time: Nov-13-2021