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Exploring the Process of Extruding PEPP Double Wall Corrugated Pipes



In the realm of modern infrastructure and construction, the demand for durable, cost-effective, and versatile piping solutions is ever-growing. Among the myriad of options available, PEPP (Polyethylene Polypropylene) double wall corrugated pipes stand out for their superior performance in various applications, ranging from drainage systems to cable protection. Understanding the intricate process behind the manufacturing of these pipes is crucial for appreciating their functionality and reliability. In this article, we delve into the fascinating process of extruding PEPP double wall corrugated pipes using specialized equipment.

Understanding PEPP Double Wall Corrugated Pipes:

Before delving into the extrusion process, it's essential to grasp the fundamentals of PEPP double wall corrugated pipes. These pipes are engineered to combine the advantageous properties of both polyethylene (PE) and polypropylene (PP). PE provides excellent chemical resistance and flexibility, while PP enhances the pipe's stiffness and impact strength. The double wall corrugated design adds structural integrity and enhances load-bearing capacity, making these pipes suitable for a wide array of applications.

The Extrusion Process:

Extrusion is a manufacturing process that involves pushing a material through a die to create a continuous profile with a fixed cross-sectional shape. The extrusion of PEPP double wall corrugated pipes requires specialized equipment and meticulous control of various parameters. Let's break down the process step by step:

1. Raw Material Preparation:

The process begins with the preparation of raw materials, which typically consist of PE and PP resins along with various additives such as stabilizers and pigments. These materials are carefully blended in precise proportions to achieve the desired properties in the final product.

2. Extrusion Line Setup:

The extrusion line comprises several components, including an extruder, a corrugator, a cooling system, and a cutting unit. The extruder melts the raw materials and pumps the molten polymer through a die, forming the inner layer of the pipe.

3. Corrugator Operation:

The corrugator is a critical component responsible for shaping the molten polymer into the characteristic corrugated profile. It consists of a series of molds or forming blocks arranged in a circular configuration. As the molten polymer passes through these molds, it takes on the desired corrugated shape, creating the outer layer of the pipe.

4. Cooling and Sizing:

After exiting the corrugator, the newly formed double wall corrugated pipe undergoes a cooling process to solidify the polymer and set its shape. Water or air cooling systems are employed to rapidly cool the pipe to the desired temperature. Simultaneously, sizing sleeves or vacuum calibration tanks ensure that the pipe maintains its dimensional accuracy and uniformity.

5. Cutting and Stacking:

Once the pipe has been sufficiently cooled and solidified, it is cut to the desired length using precision cutting units integrated into the extrusion line. The cut pieces are then stacked or coiled according to the manufacturer's specifications, ready for further processing or packaging.


The extrusion process for PEPP double wall corrugated pipes is a complex yet highly efficient method for producing durable and versatile piping solutions. By leveraging specialized equipment and precise control over various parameters, manufacturers can consistently produce high-quality pipes tailored to meet the demands of diverse applications. As the need for robust infrastructure continues to grow, understanding the intricacies of processes like extrusion becomes increasingly vital for ensuring the reliability and sustainability of modern construction projects.

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