How to Select a PP Pipe Extrusion Line:

Polypropylene (PP) pipes are widely used in hot and cold water transportation, chemical pipelines, food and pharmaceutical fluid systems, and underfloor heating due to their excellent high-temperature resistance, chemical stability, hygienic properties, and good mechanical strength. With the continuous growth in market demand for high-quality PP pipes, more and more companies are planning to invest in building or upgrading PP pipe extrusion lines. However, faced with a wide variety of equipment configurations and technical parameters, how to scientifically and rationally select the right equipment becomes crucial to the success of the project.

I. Clarifying Product Type and Specification Range

PP pipes are mainly divided into the following categories, with significant differences in equipment requirements for each category:

PP-H (Homopolymer Polypropylene): High rigidity and good temperature resistance, suitable for chemical and industrial pipelines.
PP-B (Block Copolymer Polypropylene): Excellent impact resistance, commonly used for cold water pipes.
PP-R (Random Copolymer Polypropylene): Best overall performance, the mainstream material for building hot and cold water systems.
Selection Suggestions:

If focusing on PP-R hot water pipes (such as S4, S5 series), focus on melt stability and temperature uniformity;
If producing large-diameter industrial pipes (DN ≥ 200mm), greater extrusion capacity and stronger cooling and shaping capabilities are required;
Clearly define the target pipe diameter range (e.g., φ20–φ160mm) and wall thickness grades to avoid oversized equipment or insufficient capacity.

II. Core Machine: Key Considerations for Extruder Selection

The extruder is the “heart” of the entire production line, and its performance directly affects the plasticization quality and production stability.

1. Screw Structure
It is recommended to use a barrier or separation type screw (L/D ≥ 30:1) to enhance melt uniformity and reduce overheating degradation;
For heat-sensitive materials such as PP-R, shear heat should be reduced to avoid yellowing or precipitation.

2. Drive and Temperature Control
Prioritize servo motor drive, which saves 10%~20% energy and provides more precise speed control;
The heating system should use electromagnetic induction heating or ceramic infrared heating rings, which offer fast heating, high thermal efficiency, and uniform surface temperature.

3. Extrusion Output Matching
Based on the target production capacity (e.g., 300 kg/h), determine the required screw diameter (commonly Φ65, Φ75, Φ90, etc.), and reserve a 10%~15% margin to accommodate formula adjustments or speed increase requirements.

III. Forming and Sizing System: Ensuring Dimensional Accuracy

1. Die (Extrusion Die)
Select a spiral or basket-type distributor die to ensure uniform melt flow and avoid weld lines;
The die material should be high-quality alloy steel (such as 38CrMoAlA), nitrided for wear and corrosion resistance.
2. Vacuum Sizing Tank
Equipped with a multi-segment independent vacuum + spray cooling system, allowing for separate adjustment of vacuum degree and water temperature;
For PP-R pipes, atomized cooling + water film lubrication technology is recommended to reduce internal stress and improve roundness.
3. Cooling Water Tank
The length should meet the requirements for sufficient cooling (usually 6–12 meters), with a variable frequency water pump and closed-loop water temperature control;
An optional floating-type automatic centering device can be added to prevent pipe bending.

IV. Hauling and Cutting: Key to Stable Operation

Hauling Machine: Dual-track servo hauling is recommended, with adjustable clamping force to adapt to different pipe diameters, and a hauling speed fluctuation of ≤±0.5%;
Cutting Machine: For small and medium diameters (<φ110mm), a rotary blade type can be selected; for large diameters, planetary flying knife cutting is recommended, resulting in a smooth cut without burrs;
Equipped with a laser length measuring system, achieving a length accuracy of ±1mm.
V. Intelligence and Energy Efficiency Considerations
The 2025 industry trend emphasizes “green smart factories,” so the following should be considered during selection:

Central Control System: Supports PLC + HMI + Industrial Internet of Things (IIoT), enabling process parameter storage, remote monitoring, and energy consumption analysis;
Energy Efficiency Certification: Prioritize equipment that meets national Level 1 energy efficiency standards for lower long-term operating costs;
Data Traceability Function: Can record production parameters for each batch, facilitating quality traceability and process optimization.

The selection of a PP pipe extrusion production line is a systematic project that requires considering material characteristics, product positioning, equipment performance, and future scalability. Blindly pursuing low prices or over-configuring equipment will negatively impact return on investment. It is recommended that companies thoroughly research their needs during the planning phase, engage in in-depth communication with professional equipment suppliers, and, if necessary, introduce third-party technical consultants to ensure that the selected production line is “suitable, efficient, reliable, and sustainable.” Only in this way can companies win customer trust with high-quality products in fierce market competition and achieve long-term, stable development.