1. What is an 80mic aluminum foil roll? Why is it suitable for ventilation ducts?
When it comes to ventilation ducts, the first thing many people think of are those square iron pipes. In fact, aluminum foil ventilation ducts are increasingly being used in modern buildings. And 80 Micron Aluminum Foil Coil are one of the "raw materials" for making such pipes. Here, "80mic" means that the aluminum foil is 80 Micron Aluminum Foil Coil thick (mic is short for micron), which is equivalent to 0.08 mm, which is about the thickness of a hair. This thickness is considered the "golden ratio" in ventilation duct applications-not too thin to be easily damaged, nor too thick to increase cost and manufacturing difficulties.
Aluminum foil rolls are typically 1m to 1.5m wide, and can be tens of meters or even hundreds of meters long, like giant rolls of "aluminum foil". This large roll design is especially suited for the continuous construction of ventilation ducts. They can be cut into different sizes as needed, reducing seams and increasing manufacturing efficiency.
Why is aluminum foil particularly suitable for ventilation ducts? First, aluminum itself has excellent corrosion resistance and is not as easy to rust as iron sheets; Second, aluminum foil is extremely lightweight, which greatly reduces the load bearing burden of construction structures; Third, the surface of aluminum foil is smooth, and the resistance to ventilation is small, which favors maintaining the ventilation efficiency; Most importantly, aluminum foil has excellent barrier properties, which can effectively prevent direct exchange of air inside and outside the pipes, which is particularly important in air conditioning systems.
After long term practice, the thickness of 80mic has proven to be the best choice - 60mic can be too thin and easy to break during construction, and 100mic is too thick and inconvenient to operate and increase cost. The 80mic aluminum foil has achieved a perfect balance between flexibility and strength. It can withstand the airflow pressures inside the pipes and is easy to bend and shape to fit a variety of complex building structures.
2. Five advantages of aluminum foil ventilation ducts over traditional hoses
Aluminum foil ventilation ducts have obvious advantages over traditional galvanized iron ventilation ducts, due to which the market share of aluminum foil ducts has increased in recent years.
The first is lightweight. The density of aluminum is only about one-third that of iron, which means that for the same size pipe, aluminum foil may weigh one-third or even one-fourth of iron sheet. This is particularly important in high-rise buildings - lighter means less load on the building structure, which can reduce investment in supporting structures and reduce overall construction costs. Construction workers also reported that aluminum foil pipe is much easier to handle and install, and one worker can easily move larger aluminum foil pipe, whereas iron sheet pipe often requires the cooperation of two or three people.
The second is strong corrosion resistance. Ventilation ducts often have to circulate air at a certain humidity, especially in air conditioning systems, where condensation is a common problem. Even if the iron sheet is galvanized, it will inevitably rust and corrode over a long period of time in a humid environment. Aluminum foil will naturally form a protective layer of dense aluminum oxide in the air, and will not rust even after prolonged exposure to moist environments. In disassembling and inspecting some aluminum foil pipes that had been in use for more than ten years, we found that the inside wall still maintained a metallic sheen with no obvious signs of corrosion.
The third is convenient construction. Aluminum foil pipe can be made on site and cut and assembled to the size of the actual space, which is very flexible. Aluminum foil pipe can easily accommodate various angles of turn and changes in diameter, especially when obstacles such as beams and columns are encountered and need to be bypassed. In contrast, iron pipe typically needs to be prefabricated in a factory and then transported to site, which is very passive in the face of size mismatches or installation constraints. The connection of aluminum foil pipe is also much easier. Special aluminum foil tape can complete the sealing, while iron pipe requires flange connections, which are time-consuming and laborious.
The fourth is good thermal insulation performance. Modern aluminum foil ventilation ducts are usually a composite structure, with glass wool in the middle and an insulation material such as aluminum foil on the outer layer. Aluminum foil itself is an excellent thermal radiation reflective material, which can effectively reduce heat exchange inside and outside the pipe. The test data showed that under the same insulation layer thickness heat loss
3. How to convert an 80 Micron Aluminum Foil Coil into a ventilation duct? the whole construction process
From flat rolls of aluminum foil to three-dimensional ventilation ducts, the process looks simple but actually involves many technical points. Below I will explain the construction process in detail using the most common circular air duct as an example.
The first step is to spread out and cut the material. Determine the pipe diameter and length according to the design drawing, and calculate the unfold size. For example, if you want to make a 200mm diameter round pipe, circumference π×diameter≈628mm, the aluminum foil strip cut from an 80mic aluminum foil roll should have a width of 628mm and an overlap of 15mm on both sides, totaling about 660mm wide. The length is determined according to the actual need. In general, the length of a section of pipe should not exceed 4 m, otherwise it will be difficult to transport and install.
The second step is to roll it into a round shape. Feed the cut aluminum foil strip into a special rolling machine, and the machine will automatically roll it into a cylindrical shape. Special attention should be paid to the handling of the overlap edge in this process-usually one side is folded inward and the other side is folded outward, so that the two sections of pipe can bite into each other when connected. The 80mic thickness shows its advantages in this link: it's easy to wrinkle when rolling too thin, it's hard to form neat folds when too thick.
The third step is to fix the bite. Fix the formed cylinder with a biting machine and bite off the overlapping edges. A high-quality bite should be uniform and flat, without cracking or distortion. Upon completion, gently tap the entire pipe with a rubber hammer to check for any loose areas. Some high-end projects will also have a special sealant applied inside the bite to prevent any hazards.
The fourth step is flange production. Flanges shall be installed at both ends of the pipes to connect them to each other. Aluminum foil pipe flanges are also usually aluminum, and come in different types such as angle flanges and plain plate flanges. Special attention should be paid to the verticality of the pipe when installing the flange. Excessive deflection will cause connection difficulties or even air leakage. The flange and pipe shall be fixed with rivets, and the rivet spacing shall normally not exceed 100 mm.
The fifth step is the insulation treatment. If insulation is required, wrap the pipe with an insulation material such as glass wool or rubber sponge, and then fix with aluminum foil tape. The thickness of the insulation layer is determined by the design requirements, and typical specifications include 25 mm, 40 mm. They must be completely sealed leaving no gaps, otherwise condensation will occur.
The sixth step is lifting and connecting. The prepared pipe sections are transported to the installation site and installed with special hangers. When assembling, first place the sealing gasket between the flanges, and then tighten with the bolts. After installation, check for air leakage to ensure that the entire system is well sealed. According to the specifications, the air leakage rate of low pressure systems should not exceed 6%, and medium pressure systems should not exceed 3%.
It is worth mentioning that the 80mic aluminum foil roll can make not only circular pipes but also square pipes. The square tube manufacturing process is slightly different. A folding machine is needed to fold the aluminum foil on four sides, and then the corners are reinforced with corner guards. Square tubes are more suitable for spaces with limited space because they can be made relatively flat.
4. Precautions to use 80mic aluminum foil ventilation ducts
Although 80mic aluminum foil ventilation ducts have many advantages, some cases require special attention in actual use. Ignoring these details can lead to degraded or even premature pipeline system performance.
After all, aluminum foil is a relatively soft material. Although a thickness of 80 Micron Aluminum Foil Coil is sufficient for everyday use, it is necessary to avoid scratches from sharp objects during transport and installation. Often, construction sites contain metal objects such as steel bars and scaffolding. Accidental collisions can damage the aluminum foil surface. Accidental damage from other types of construction is particularly likely at the stage where pipelines have been installed but are not yet in use. Protective angle iron or wood boards are recommended in collision-prone sections of the pipeline.