Price of 20mm-1200mm PVC Pipe Extrusion Line | BEISU Extruder Manufacturer

PVC production line technology encompasses core stages such as raw material processing, extrusion and plasticization, vacuum sizing, and cooling/cutting. Process parameters vary significantly based on pipe diameters (e.g., 20–63mm, 75–250mm, 315–630mm, 630–1200mm for drainage or water supply pipes) and materials (rigid PVC, PVC-C). The core technical focus of PVC multi-layer co-extrusion pipe lines lies in ensuring material compatibility, maintaining uniform layer thickness, and achieving high-speed synchronous control. By merging molten materials with distinct properties within a composite die head, the resulting pipes combine functionalities such as barrier properties, strength, and corrosion resistance; these are widely used in applications like oxygen-barrier pipes, aluminum-plastic composite pipes, and large-diameter sewage pipes.

Core Process Flow and Key Technical Data

PVC pipe production typically employs a conical twin-screw extrusion process. The standard workflow is: raw material preparation → high-speed mixing → cooling mixing → forced feeding → twin-screw extrusion → die forming → vacuum sizing → spray cooling → haul-off and cutting → finished product stacking.

1. Raw Material Mixing and Pre-treatment

Mixing Temperature: The high-speed hot mixer raises the material temperature to 120°C–125°C via friction to ensure additives fully penetrate the resin; the mixture then enters the cooling mixer to drop to 40°C–50°C before entering the extruder hopper, preventing premature plasticization.

Formulation Essentials: Rigid PVC pipes typically utilize SG-5 grade resin (particle size approx. 0.2mm) combined with stabilizers, lubricants, and processing aids; for certain high-end products, additives require pre-mixing 24 hours in advance. 2. Extrusion and Plasticization Section (Core Parameters)

This is the critical stage determining pipe quality; temperature control across the various zones of the conical twin-screw extruder is extremely strict:

“Feeding Zone”: Set temperature 165°C ± 3°C; primarily responsible for material transport and initial preheating.

“Melting Zone”: Set temperature 180°C ± 2°C; material is fully plasticized here; any material buildup must be cleared promptly.

“Metering Zone/Die Head”: Set temperature 195°C ± 1°C; exceeding 200°C is strictly prohibited, as it causes PVC decomposition and discoloration, necessitating an emergency shutdown.

“Screw Speed”: Variable frequency drive (VFD) control is typically used; main motor current must remain stable to ensure the extrusion rate matches the feeding rate.

3. Vacuum Sizing and Cooling
“Vacuum Level”: The vacuum sizing tank must maintain sufficient negative pressure (typically -0.08 MPa to -0.09 MPa) to ensure precise outer pipe diameter and prevent ovality.

“Cooling Water Temperature”: Spray cooling tanks usually employ circulating water controlled at 15°C–25°C; large-diameter pipes require staged cooling to prevent cracking caused by internal stress.

4. Special Process: PVC-C Chlorination Reaction (for industrial pipe production)

If the production line involves PVC-C (chlorinated polyvinyl chloride) modification, a chlorination reaction step is required:

Reaction Temperature: Strictly controlled at 65 ± 2°C; excessive temperatures lead to decomposition.

Reaction Pressure: 0.35 MPa (approx. 3.5 atmospheres); reaction time is approximately 5 hours.

Chlorine Content: The finished product must achieve a chlorine content of 65 ± 2% to meet specifications.

PVC Production Line Costs and Investment

Production Line Equipment: The cost of a single pipe production line ranges from over 100,000 to over 1 million RMB, accounting for approximately 50% of the fixed investment.

Factory Facilities and Infrastructure: Constructing a 10,000-square-meter factory incurs infrastructure costs of roughly 3–5 million RMB, plus the need for auxiliary facilities such as transformers, circulating water systems, and air compressors; leasing a facility requires only monthly rent, significantly reducing the initial investment.

Environmental Impact Assessment (EIA) and Administrative Procedures: As PVC production falls under the chemical industry, environmental approval requirements are stringent, often incurring costs in the hundreds of thousands of RMB.

Working Capital

Industry standards dictate that working capital must cover at least 3–6 months of raw material procurement and labor costs. PVC production relies heavily on raw materials like calcium carbide or ethylene; due to significant price volatility, companies often need to maintain inventory, a component that typically accounts for 20%–30% of the total investment.

3. Key Factors Influencing Total Investment

Production Process Route: The mainstream domestic calcium carbide method requires far less investment than the ethylene method. The calcium carbide method leverages coal resources, resulting in lower investment costs in central and western regions; conversely, the ethylene method relies on imported crude oil, leading to higher raw material costs and project investment.

Supply Chain Integration: Integrated enterprises that operate their own calcium carbide or chlor-alkali units face significantly higher initial investments but can reduce unit production costs by 10%–15%, enhancing long-term competitiveness. Enterprises focused solely on processing require lower investment but are highly susceptible to raw material price fluctuations.

Product Positioning: Projects limited to manufacturing standard residential drainage pipes require lower investment. Projects producing high-end PVC-C industrial pipes or medical-grade PVC products require high-precision equipment and cleanroom facilities, increasing the investment by more than 30%.

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