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  4. what is Aluminum plastic tube?...

what is Aluminum plastic tube?

Aluminum plastic tube

Aluminum plastic tube (English name: Aluminum Plastic Tube) is a new type of pipe composed of longitudinally welded aluminum tube, inner and outer layers of polyethylene plastic and hot melt adhesive between layers. Polyethylene is a non-toxic, odorless plastic with good impact resistance, corrosion resistance and weather resistance. The longitudinally welded aluminum alloy in the middle layer makes the pipe have metal compressive strength, and the impact resistance makes the pipe easy to bend and not rebound. The aluminum-plastic composite pipe has the two characteristics of solid metal pipe pressure resistance and plastic pipe resistance to acid and alkali corrosion, which is new A model of the first generation of pipes. Aluminum-plastic pipe (aluminum-plastic composite pipe) is a popular pipe material on the market. Due to its light weight, durability and convenient construction, and the flexibility of aluminum-plastic pipe (aluminum-plastic composite pipe), it is more suitable for use in home decoration.
The inner and outer layers of aluminum-plastic pipes are made of special polyethylene materials, which are clean, non-toxic and smooth. Can be used for more than fifty years. The middle aluminum layer can insulate the gas from permeating 100%, and make the tube have the advantages of both metal and plastic tubes, while eliminating their own shortcomings.
Chinese name aluminum plastic tube foreign name Aluminum Plastic Tube material polyethylene plastic advantages metal and plastic tube advantages are divided into ordinary drinking water pipe, high temperature resistant pipe, gas pipe application range of cold and hot water, heating, oxygen, gas, etc.
table of Contents
1 Classification
2 Use
3 Advantages
4 Identification
5 Selection
6 Prospect
7 Application areas
8 Comparison of aluminum-plastic pipe and PB pipe
Category Editor
According to usage, there are ordinary drinking water pipes, high temperature resistant pipes, and gas pipes. The characteristics and uses of various pipes are as follows:
Aluminum plastic tube
Aluminum plastic tube
① Aluminum-plastic composite pipe for ordinary drinking water: white L mark, applicable scope: domestic water, condensate, oxygen, compressed air, other chemical liquid pipes.
② Aluminum-plastic composite pipe for high temperature resistance: red R mark, mainly used for hot water and heating pipeline system with long-term working water temperature of 95℃.
③ Aluminum-plastic composite pipe for gas: yellow Q mark, mainly used to transport natural gas, liquefied gas and gas pipeline systems.
④ When the pipeline is constructed, it must comply with the corresponding technical regulations [1].
Purpose edit
Hot and cold water piping system
The interior of the aluminum-plastic composite pipe is smooth, non-corrosive, and does not form scale, which is 30% larger than the metal pipe flow. bending
Aluminum plastic tube
Aluminum plastic tube
Easy, can be installed directly without beams, can be buried in walls and concrete, and a simple metal detector can detect the installation location, so the pipe is very suitable for industrial and civil buildings in hot and cold water piping system use.
Indoor gas pipeline system
The longitudinally welded aluminum tube is sandwiched between plastics, so that the all-round tube can withstand higher working pressure, and the gas (oxygen) permeability is zero, and the length of the tube can reduce the joint to avoid leakage, so this tube is used for compressed air and gas , Oxygen and other gas transmission lines are safe and reliable.
Solar air conditioning piping system
Aluminum-plastic composite pipes are not prone to frost, and have good thermal insulation, which improves the efficiency of solar energy and air conditioning systems [1].
Advantage editing
The advantages of aluminum-plastic pipes can be summarized into the following three aspects:
1. Outstanding hygienic performance: The inner and outer layers of aluminum-plastic pipes are made of special polyethylene materials, which are clean and non-toxic. The most important thing is that the middle layer of aluminum-plastic pipe is aluminum, which can not only block light, but also block oxygen. As we all know, the environment of living microorganisms must have light and oxygen. The aluminum layer in the middle of the aluminum-plastic pipe prevents the growth of microorganisms and algae, which is beyond the reach of the plastic pipe. All plastic
Aluminum plastic tube
Aluminum plastic tube
Not only does the tube itself add a lot of antioxidants to prevent material degradation, the antioxidants are extracted into the water retained in the pipeline, which is easy to cause water pollution, and because there is no light-blocking and oxygen-blocking material in the plastic tube, it is very easy to cause microorganisms. Secondary pollution of water quality.
2. Excellent high and low temperature resistance: long-term use temperature of 95 degrees (50 years, IMPa), maximum use temperature of 110 degrees, and small thermal expansion coefficient of aluminum-plastic pipes. It has a thermal expansion coefficient equivalent to that of aluminum, only one-sixth of that of all-plastic pipes. When the temperature changes, the amount of deformation is small, and the aluminum-plastic pipe is a flexible coil. The pipe itself can digest a certain amount of deformation without causing thermal expansion deformation of the pipeline system. The high and low temperature resistance of all plastic pipes is relatively poor. The long-term use temperature of PPR is only 70 degrees (50 years, IMPa) and the maximum use temperature is 95 degrees. At the same time, the expansion coefficient of the PPR pipeline is large, and there is a large amount of original deformation when the external water temperature (cold and hot water) changes. Because the PPR pipe is a rigid straight pipe, it cannot digest the deformation itself, so it is easy to cause the system to deform and even leak.
3. Long service life: the PE plastic used in aluminum-plastic composite pipes, the molecular chain structure (-CH2-CH2-) is relatively stable in plastics, and because the aluminum layer in the middle of the aluminum-plastic pipe isolates the inner and outer layers, the outer plastic is allowed to join A stabilizer sufficient to resist light and oxygen aging without affecting the hygiene of the inner layer in contact with water, thereby enhancing its anti-aging properties.
Identification
So how to identify the quality of aluminum-plastic composite pipe? There are several methods:

Impact method: Randomly select a section of aluminum-plastic composite tube and impact with a harder object. The surface of the tube will be bent. If it is deformed to break, it will be of poor quality; if the deformed surface cannot be restored, it will be of general texture; after deformation, it can be restored to immediately The original form is high-quality aluminum-plastic pipe.
Visual inspection method: high-quality aluminum-plastic tube has uniform color/code, no color difference, and roundness is less than 0.1; the interface of the middle aluminum layer is tight and no rough marks; the inner and outer surfaces are smooth/smooth, and there must be no obvious scratches/dents/bubble/dead material/ Bus line
Touch method: Take a square piece of aluminum-plastic pipe and cut it vertically, and use your fingers to extend into the pipe. The mouth of the high-quality pipe is smooth and there is no texture; the mouth of the pipe has no burrs.
Comparison method:
1. Comparison of raw materials. The PE materials of high-quality aluminum-plastic composite pipes in the domestic market are all from abroad, such as the United States and South Korea. If the raw materials are from recycled materials, the quality cannot be guaranteed.
2. For physical comparison, compare aluminum-plastic pipes of different brands one by one from the above aspects to achieve optimal selection [1].
Select
People may not be unfamiliar with the three characters of aluminum-plastic pipes, but to really understand it, we need to talk about its origin. The full name of the aluminum-plastic pipe should be aluminum-plastic composite pipe. Its invention originated in the United Kingdom. In the 1970s, the British expert Dr. Lzhak Barnoach put forward the idea to pass high-density PE (plastic) through PE hot-melt additives. Like the production of five-plywood, it is formed with aluminum alloy through high heat and pressure, and combined with physical and chemical compounding to form an aluminum-plastic composite tube. After years of improvement by experts from Europe and the United States, great progress has been made in production technology and quality. By the end of the 1980s, aluminum-plastic composite pipes had been widely used in developed countries. The utilization rate of water supply pipes in Japan reached 87%, and the utilization rate of gas pipelines in the United States and Denmark was as high as 90%.
Since the aluminum-plastic composite pipe is a new type of pipeline material that conforms to China's industrial policies and the development direction of high-tech products, the Ministry of Construction put forward the idea and plan for the development and sale of aluminum-plastic composite pipes in 1992; it officially issued a document in 1995 to promote the replacement of aluminum-plastic composite pipes Metal pipes have a huge potential market in China. The production technology of aluminum-plastic composite pipe is the most advanced in Germany, especially the German Yonek company has the most advanced patented technology. There is no patented technology for aluminum-plastic composite pipes in my country, and many brands are imported German patented technologies in production technology. The statement that "** originates from Germany and aluminum-plastic composite pipes originate from **" is absolutely incorrect.
How to choose an authentic aluminum-plastic composite pipe, we must first understand its basic structure and advantages. The aluminum-plastic composite pipe has five layers, the inner and outer layers are polyethylene, and the middle layer is an aluminum thin layer. There is also a layer of adhesive between the two materials, and the five layers are tightly combined into one. Its superior performance is: it has stable chemical properties, corrosion resistance, non-toxic and pollution-free, smooth and smooth surface and inner wall, no scaling, light weight, free bending, good toughness, and has unique environmental protection and energy saving advantages. There are many domestic brands of aluminum-plastic composite pipes, which vary in the choice of raw materials, chemical additives, production technology and production equipment. Some brands use low-quality, low-cost materials with poor performance in the selection of raw materials and adhesives. The production technology is lagging behind, and five-layer co-extrusion cannot be achieved. The quality, price, installation and use of aluminum-plastic composite pipes produced in this way Naturally, it is far lower than a brand with excellent quality.
To pass the product quality, there must be correspondingly perfect supporting services. The product quality is excellent and the service measures are complete. The combination of the two is the first choice for consumers. Every penny spent by consumers can reflect its value, not only in product quality, but also in after-sales service. The quality of low-quality and low-priced products cannot be guaranteed, let alone the service, and the correct consumption concept can be established to select the truly satisfactory aluminum-plastic composite tube, so that consumers can have a perfect home.
prospect
Aluminum-plastic composite pipes are "hand-picked" with unparalleled advantages as the preferred cold and hot water supply pipes and ideal heating pipes. Compared with other pipes, aluminum-plastic composite pipes have developed quite maturely in China, and have perfect product standards and application specifications, which are widely accepted by the market. The rapid development trend of foreign aluminum-plastic composite pipes also confirms this fact: According to the statistics of the German KWD Plastic Information Center, in Europe, aluminum-plastic pipes are increasing at a rate of more than 20% per year. I believe that in China, aluminum-plastic composite pipes will have a broader market space [2].
Application area editor
Aluminum-plastic pipes are widely used in ordinary drinking water pipes, high temperature resistant pipes, gas pipes, condensed water, oxygen, compressed air, other chemical liquid pipes, natural gas, liquefied gas, and gas pipes.
Comparison of aluminum-plastic tube and PB tube
PB tube: The PB tube was invented by the Germans. It has been mass-produced in Europe for nearly 30 years since 1971, but after 35 years of practical use, it was found that the pure plastic tube cracked and deformed at the bent part The phenomenon of clogging and aging will cause water leakage or water circulation.
Aluminum-plastic pipe: Due to the cracks and deformation of pure plastic pipe, the inventor thought of adding a layer of aluminum alloy to the outer layer of the plastic pipe. The main purpose is to take the excellent ductility of the aluminum alloy, and then to protect the aluminum alloy. A PE layer is added to the layer, and there is a glue layer between the PE and the aluminum alloy, which becomes a five-layer structure aluminum-plastic composite pipe seen on the market. Aluminum-plastic pipe is a product that eliminates the shortcomings of galvanized iron pipe (will rust) and pure plastic pipe (oxygen penetration and bending, blockage), and combines the advantages of the two. It can be seen that aluminum-plastic pipe is a product that replaces various types of pipe materials [3].

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