A comprehensive introduction to aluminum plastic pipe
A comprehensive introduction to aluminum plastic pipeAluminum plastic tube (English name: Aluminum Plastic Tube) is a new type of pipeline made of longitudinally welded aluminum tube in the middle, inner and outer layers of polyethylene plastic, and hot melt adhesive between layers. Polyethylene is a non-toxic, odor-free plastic with good impact resistance, corrosion resistance and weather resistance. The longitudinal welded aluminum alloy in the middle layer makes the pipe have the compressive strength of metal, and the impact resistance makes the pipe easy to bend and does not rebound. The aluminum-plastic composite pipe has two major characteristics: metal pipes are strong and pressure resistant and plastic pipes are resistant to acid and alkali. A model of a generation of pipes. Aluminum-plastic pipe (aluminum-plastic composite pipe) is a popular pipe material on the market. Because of its light weight, durability and convenient construction, and the flexibility of aluminum-plastic pipe (aluminum-plastic composite pipe), it is more suitable for home decoration.
The inner and outer layers of the aluminum-plastic pipe are made of special polyethylene materials, which are clean, non-toxic and smooth. It can be used for more than 50 years. The middle aluminum layer can prevent gas penetration by 100%, and make the pipe have the advantages of metal and plastic pipes at the same time, while eliminating their respective shortcomings.
The Chinese name is aluminum-plastic pipe and the foreign name is Aluminum Plastic Tube. The advantages of polyethylene plastic are the advantages of metal and plastic pipes. The advantages of metal and plastic pipes are classified into ordinary drinking water pipes, high temperature resistant pipes, and gas pipes. The application range of cold and hot water, heating, oxygen, gas, etc.
table of Contents
1 category
2 Purpose
3 advantages
4 Identification
5 Optional
6 Prospects
7 Application areas
8 Comparison of aluminum plastic pipe and PB pipe
classification
According to the purpose, there are ordinary drinking water pipes, high temperature resistant pipes, and gas pipes. The characteristics and uses of various types of pipes are as follows:
Aluminum plastic pipe
Aluminum plastic pipe
① Aluminum-plastic composite pipe for ordinary drinking water: white L mark, application scope: domestic water, condensate, oxygen, compressed air, and other chemical liquid pipes.
② Aluminum-plastic composite pipe for high temperature resistance: red R mark, mainly used for hot water and heating piping system with long-term working temperature of 95℃.
③ Aluminum-plastic composite pipe for gas: yellow Q mark, mainly used to transport natural gas, liquefied gas and coal gas pipeline system.
④ The pipeline construction must comply with the corresponding technical regulations [1].
Purposeedit
Hot and cold water pipe system
The interior of the aluminum-plastic composite pipe is smooth, non-corrosive, and non-scaling, and the flow rate is 30% larger than that of the metal pipe. bending
Aluminum plastic pipe
Aluminum plastic pipe
It is easy to install directly through beams and columns, and can be buried in walls and concrete. With a simple metal detector, the installation location can be detected. Therefore, the pipe is very suitable for cold and hot water pipeline systems in industrial and civil buildings. use.
Indoor gas pipeline system
The longitudinally welded aluminum pipe is sandwiched between the plastic, so that the universal pipe can withstand higher working pressure, so that the gas (oxygen) permeability is zero, and the pipe length can reduce joints and avoid leakage. Therefore, this pipe is used for compressed air and gas. Gas transmission lines such as, oxygen, etc. are safe and reliable.
Solar air conditioning piping system
The aluminum-plastic composite pipe is not easy to form frost, has good heat preservation, and improves the efficiency of solar energy and air conditioning systems [1].
Advantage
The advantages of aluminum plastic pipe can be summarized into the following three aspects:
1. Outstanding hygiene performance: The inner and outer layers of the aluminum-plastic pipe are made of special polyethylene materials, which are clean and non-toxic. The most important thing is that the middle layer of the aluminum-plastic tube is aluminum, which can not only block light, but also block oxygen. As we all know, the environment of unhealthy microorganisms must have light and oxygen. The middle aluminum layer of the aluminum-plastic tube prevents the breeding of microorganisms and algae, which is beyond the reach of all-plastic tubes. All plastic
Aluminum plastic pipe
Aluminum plastic pipe
Not only does the tube itself add a large amount of antioxidants to prevent material degradation, the antioxidants are extracted into the water retained in the pipeline, which is likely to cause water pollution, and because there is no light and oxygen barrier material in the all-plastic tube, it is very easy to grow microorganisms. Secondary pollution of water quality.
2. Excellent high and low temperature resistance: long-term use temperature is 95 degrees (50 years, 1MPa), maximum use temperature is 110 degrees, and the thermal expansion coefficient of aluminum-plastic pipe is small. It is equivalent to the thermal expansion coefficient of aluminum, only one-sixth of the full plastic tube. When subjected to temperature changes, the amount of deformation is small, and the aluminum-plastic pipe is a flexible coil, and the pipeline itself can digest a certain amount of deformation without causing thermal expansion and 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 PPR pipeline has a large expansion coefficient, and when the external water temperature (cold and hot water) changes, there will be a large original deformation. Because the PPR pipe is a rigid straight pipe, it cannot digest the deformation, so it is easy to cause the system to bend and deform or even leak.
3. Long service life: PE plastic used in aluminum-plastic composite pipe, molecular chain structure (-CH2-CH2-) is relatively stable among plastics, and since the middle aluminum layer of the aluminum-plastic pipe isolates the inner and outer layers, the outer plastic is allowed to be added A stabilizer that can resist light and oxygen aging without affecting the hygiene of the inner layer in contact with water, thereby enhancing its anti-aging performance.
Identify
So how to identify the quality of aluminum-plastic composite pipe? There are several methods:
Aluminum plastic pipe joint
Aluminum plastic pipe joint
Impact method: randomly select a section of aluminum-plastic composite pipe and hit it with a harder object. The surface of the pipe will appear curved. If it is deformed to break, it is inferior; the deformed surface cannot be restored, and it is of normal texture; it can be restored immediately after deformation. The original shape is a high-quality aluminum-plastic tube.
Visual inspection method: high-quality aluminum-plastic tube has uniform color/code spraying, no color difference, roundness less than 0.1; the middle aluminum layer interface is tight, no rough marks; the inner and outer surfaces are smooth/smooth, without obvious scratches/dents/bubbles/dead material/ Confluence line
Touch method: Take a square section of aluminum-plastic pipe and cut it vertically, and put your finger into the pipe. The nozzle of the high-quality pipe is smooth and has no feeling of lines; the nozzle has no burrs.
Contrast method:
1. Comparison of raw materials. The PE materials of high-quality aluminum-plastic composite pipes in the domestic market are all from foreign countries, such as the United States and South Korea. If the raw materials are from recycled materials, the quality cannot be guaranteed.
2. Physical comparison, comparing aluminum-plastic pipes of different brands from the above aspects one by one, so as to achieve the best choice [1].
Select
People may not be unfamiliar with the three words aluminum-plastic tube, but to truly understand it, we must start with its origin. The full name of the aluminum-plastic pipe should be the aluminum-plastic composite pipe. Its invention originated in the United Kingdom. In the 1970s, the British expert Dr. Lzhak Barnoach put forward an idea to pass high-density PE (plastic) through a PE hot-melting additive. Like the production of five plywood, it is formed with aluminum alloy through high heat and high pressure, and is composited into an aluminum-plastic composite pipe by combining physical and chemical composite. After years of improvement by experts from European and American countries, 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 reached 90%.
As aluminum-plastic composite pipe is a new type of pipeline material that conforms to China’s industrial policy and the development direction of high-tech products, the Ministry of Construction put forward the idea and plan to develop and sell aluminum-plastic composite pipe in 1992; in 1995, it formally issued a document to promote the replacement of aluminum-plastic composite pipe 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 have imported German patented technology in production technology. The statement that "** originated from Germany, aluminum-plastic composite pipes originated 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 both polyethylene, and the middle layer is an aluminum thin layer. There is a layer of adhesive between the two materials, and the five layers are tightly combined into one. Its superior properties are: stable chemical properties, corrosion resistance, non-toxic and non-polluting, smooth surface and inner wall, no scaling, light weight, free bending, good toughness, and unique environmental protection and energy saving advantages. There are many domestic brands of aluminum-plastic composite pipes, and the selection of raw materials, chemical additives, production technology and production equipment is uneven. Some brands choose low-quality and low-cost materials with poor performance in the selection of raw materials and adhesives. The production technology is backward and cannot achieve five-layer co-extrusion. The aluminum-plastic composite pipe produced in this way is in terms of quality, price, installation and use. Naturally, it is far inferior to high-quality brands.
The quality of the products must pass, and there must be corresponding complete supporting services. With excellent product quality and complete service measures, a brand that combines 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-price products cannot be guaranteed, not to mention the service. Only by establishing the correct consumption concept can we choose the truly satisfactory aluminum-plastic composite pipe, so that consumers can have a perfect home.
Prospect editor
Aluminum plastic pipe
Aluminum plastic pipe
Aluminum-plastic composite pipes have been selected as the preferred cold and hot water supply pipes and ideal heating pipes with unparalleled advantages. Compared with other pipe materials, the development of aluminum-plastic composite pipe in China is quite mature, with complete product standards and application specifications, and is widely accepted by the market. The rapid development trend of foreign aluminum-plastic composite pipes also confirms this fact: according to the statistical results of the German KWD Plastic Information Center, in Europe, aluminum-plastic composite pipes are increasing at an annual rate of more than 20%. It is believed that in China, aluminum-plastic composite pipes will have a broader market space [2].
Application field
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 coal gas pipes.
Comparison of aluminum plastic pipe and PB pipeedit
PB tube: PB tube was invented by the Germans. It has been mass-produced in Europe for nearly 30 years since 1971. However, after 35 years of practical use, it was found that the pure plastic tube had cracks and deformations in the bent part. The phenomenon of plugging, and will age, cause water leakage or water cannot flow.
Aluminum-plastic pipe: due to the cracks and deformation of the 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 obtain the excellent ductility of the aluminum alloy, and then to protect the aluminum alloy from the outside. A PE layer is added to the layer, and there is a glue layer between PE and aluminum alloy, which becomes the five-layer aluminum-plastic composite pipe seen in the market. Aluminum-plastic pipe is a product that eliminates the shortcomings of galvanized iron pipes (which will rust) and pure plastic pipes (which can permeate oxygen, bend and block), and combine the advantages of both. It can be seen that aluminum-plastic pipes are products that replace all kinds of pipes
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