Application of multi-layer co-extrusion technology in HDPE pipe production line

The application research of three-layer co-extrusion technology in HDPE pipe production lines mainly focuses on improving the functionality, durability, and production efficiency of pipes through material composites and structural design. The following are the specific applications and advantages of this technology in different types of HDPE pipes:

I. Technical Implementation and Core Advantages

1. Multi-layer Composite Structure Design

Three-layer co-extrusion technology achieves seamless bonding of PE, EVOH, and adhesives through independent extruders and precision molds, forming a material system that combines rigidity and flexibility. For example, Jiangsu Xinhe's HDPE three-layer composite silent drainage pipe uses an intermediate foaming layer + smooth inner and outer structures, significantly improving noise reduction and pressure resistance.

2. Performance Improvement

Noise Reduction: The spiral structure on the inner wall reduces noise through turbulence, lowering it to below 45 decibels, making it suitable for hospitals, schools, and other places with high noise requirements.

Temperature and Corrosion Resistance

The pipe can withstand long-term operating temperatures up to 70°C and maintain toughness at -20°C, and exhibits good corrosion resistance to non-oxidizing acids (such as hydrochloric acid and dilute sulfuric acid).

II. Production Optimization and Process Innovation

Equipment Layout and Cycle Control: The production line adopts a U-shaped or straight layout to optimize material flow, and reduces accumulation and waiting time by ensuring consistent equipment cycle time, thereby improving production efficiency.

Precision Process Guarantee: Companies like Jiangsu Xinhe employ multiple precision process inspections to ensure product sealing and noise reduction. They also utilize an AI vision sorting system to improve impurity identification rate to 99.8%.

III. Application Scenarios Expansion: Three-layer co-extrusion technology is not only used for silent drainage pipes but is also widely applied in municipal engineering (such as integrated pipe corridors) and industrial fields (such as chemical wastewater discharge). Its high ring stiffness and compressive strength can replace traditional metal pipes.

Summary: Through material composite and process innovation, three-layer co-extrusion technology significantly improves the performance of HDPE pipes in scenarios requiring quiet operation, pressure resistance, and corrosion resistance, while also considering production efficiency and environmental protection requirements.