DN100mm aluminum alloy plastic-lined composite pipe for underfloor heating, central air conditioning, water heater, and cold/hot water pipelines.

Aluminum alloy plastic-lined composite pipe is a new type of practical pipeline that combines the physical and chemical advantages of both metal and plastic materials. The following is a detailed introduction:
I. Structural Features
The aluminum alloy plastic-lined composite pipe adopts a double-layer structure design, with an outer layer made of aluminum alloy pipe and an inner layer made of thermoplastic plastic pipe. This design not only combines the advantages of both materials but also enhances the overall performance of the pipe. Specifically:
Outer aluminum alloy pipe: Made of 6063 deformed aluminum, it is heated and extruded into a seamless aluminum pipe, which is then treated with an anodizing process. It features high hardness, excellent strength, and impact resistance. The oxide film (aluminum oxide) formed after anodizing has an average thickness of over 10μm, further improving the corrosion resistance and service life of the aluminum alloy pipe.
Inner thermoplastic plastic pipe: Made of food-grade thermoplastic materials (such as PPR, PERT, PB, PE), ensuring water quality safety. These plastic materials offer excellent chemical resistance and heat resistance, capable of resisting erosion from various chemical substances while ensuring no deterioration due to temperature changes during long-term use.
II. Performance Advantages
Thanks to its unique structure and materials, the aluminum alloy plastic-lined composite pipe offers multiple performance advantages:
Pressure resistance and aging resistance: The aluminum alloy plastic-lined composite pipe not only has an elegant appearance but also effectively resists UV radiation from sunlight, extending the pipeline's service life, making it particularly suitable for exposed installations.
Excellent oxygen barrier performance: Plastic itself is a non-gas-tight material, allowing oxygen to easily permeate through the plastic pipe into the water. However, the outer aluminum alloy pipe of the composite pipe effectively blocks oxygen permeation, overcoming the drawback of single plastic pipes, which are prone to microbial and algal growth.
Easy installation: The aluminum alloy plastic-lined composite pipe weighs only 1/6 of galvanized pipes, making it easy to transport. Additionally, it uses heat fusion or electrofusion connections, eliminating the need for threading. The operation is easy to master and control, making installation more convenient and efficient.
Stable flow rate: The inner plastic pipe has a smooth inner wall that does not scale, reducing transportation resistance and ensuring flow stability.
Thermal insulation and energy efficiency: Although the outer aluminum alloy material has good thermal conductivity, the inner plastic lining provides excellent thermal insulation, reducing heat loss and improving energy efficiency.
Wide range of applications: The aluminum alloy plastic-lined composite pipe is suitable for various applications, such as domestic cold and hot water, natural gas pipelines, and air conditioning pipes, meeting the needs of different fields.
III. Production Process
The production process of the aluminum alloy plastic-lined composite pipe mainly includes the following steps:
Manufacturing of seamless aluminum alloy pipe: The raw material, 6063 aluminum alloy, is processed through an aluminum alloy pipe hot extrusion machine to create seamless round pipes that meet relevant standard requirements.
Anodizing treatment: The seamless aluminum pipe is placed in an anodizing tank for treatment, forming a dense oxide film that enhances the corrosion resistance and service life of the aluminum alloy pipe.
Manufacturing of the inner plastic pipe: A plastic pipe extruder is used to extrude the required plastic pipe, ensuring its material and performance meet relevant standard requirements.
Prestressed compositing: The produced aluminum pipe and plastic pipe are placed in a cleanroom and inserted into each other. They are then firmly composited together through the prestressing of an aluminum-plastic physical compositing machine. This process requires no adhesives and is entirely physical, fusing the two pipes together.
Cutting, chamfering, and coding: The composited aluminum alloy plastic-lined pipe is cut to a fixed length (typically 6m per piece), with excess material at both ends removed using a cutting machine. The ends of the pipe are then chamfered. The processed pipe is coded using a coding machine and finally packaged as a finished product.
IV. Application Fields
Thanks to its multiple advantages, the aluminum alloy plastic-lined composite pipe is widely used in various fields such as construction and industry:
Construction field: Suitable for cold and hot water pipeline systems inside and outside buildings, direct drinking water pipeline systems, and supply and return water pipelines for heating and air conditioning systems.
Industrial field: Used for cold and hot water systems in civil and industrial buildings, as well as drinking water, pharmaceutical, and environmental protection clean water pipeline systems.
Other fields: Also widely used in drainage systems, underfloor heating systems, gas transmission, and industrial pipelines.