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Help CenterHDPE Inner Rib Reinforced Krah Pipe Extrusion Line for High Strength Structural Wall Pipe
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Qingdao Yongke Machinery Co., Ltd. (established 2010) is a professional manufacturer specializing in HDPE pipe extrusion lines. Our HDPE Inner Rib Reinforced Krah Pipe Extrusion Line is engineered to produce high-strength structural wall pipes with an integrated inner rib reinforcement design. This advanced system combines the proven Krah spiral winding technology with our proprietary inner rib forming process, delivering pipes that offer superior ring stiffness, impact resistance, and long service life. With a factory size of over 10,000 sqm and exports to more than 10 countries, we are committed to providing reliable, cost-effective solutions for municipal drainage, industrial wastewater, and structural infrastructure projects.
● Product Overview
This extrusion line is specifically designed for manufacturing HDPE structural wall pipes reinforced with inner ribs. Unlike conventional smooth-wall pipes, the inner rib structure significantly enhances the pipe's mechanical strength while reducing material consumption. The production line integrates a single-screw extruder with a specially designed die head for simultaneous extrusion of the pipe wall and the inner ribs. A precision rotating mandrel forms the pipe body, and a cooling/calibration system ensures dimensional accuracy. The result is a lightweight yet extremely strong pipe suitable for deep-burial applications and high-load environments.
● Key Technical Specifications
| Model | YK-KRG-120 | YK-KRG-150 | YK-KRG-180 |
| Screw Diameter (mm) | 120 | 150 | 180 |
| Pipe Diameter (mm) | 200-800 | 400-1400 | 600-2000 |
| Wall Thickness (mm) | 10-30 | 15-45 | 20-60 |
| Output (kg/h) | 200-350 | 300-500 | 450-600 |
| Total Power (kW) | 150 | 250 | 350 |
● Main Components & Advantages
- Single-Screw Extruder – Equipped with bimetallic barrel and forced cooling, ensuring stable output and long service life.
- Spiral Die & Inner Rib Forming Head – Patented design that uniformly distributes melt for both the pipe wall and inner ribs, achieving precise geometry.
- Rotating Mandrel & Vacuum Calibration – Produces consistent wall thickness and smooth inner/outer surfaces; rib position accuracy within ±1 mm.
- Multi-Zone Spray Cooling Tank – Rapid and uniform cooling reduces internal stress and improves crystallinity.
- Haul-Off Unit & Traveling Cutter – Servo-driven for low-tension operation; automatic cutting with chamfering function.
- PLC Control System – Siemens-based touch screen interface, recording production data and enabling remote diagnostics.
● Benefits for Customers
- Higher ring stiffness (SN ≥ 16 kN/m²) due to inner rib reinforcement, meeting stringent infrastructure standards.
- Up to 20% material savings compared to solid-wall pipes of equivalent stiffness, lowering raw material costs.
- Reduced weight – easier handling, transportation, and installation, especially for large-diameter pipes.
- Excellent chemical resistance – HDPE pipes are resistant to acids, alkalis, and sewage, ensuring 50+ year service life.
- Flexible production – quick mold change (within 4 hours) for different diameters and wall thicknesses.
- Low energy consumption – optimized motor and heating system reduce electricity cost by 10-15% compared to conventional lines.
● Quality & Reliability
All components are sourced from reputable brands (Siemens, ABB, SKF, etc.). The production line undergoes strict quality control at every stage, from raw material inspection to final pipe testing. Our factory is certified with ISO9001, ISO14001, and OHSAS18001, reflecting our commitment to quality, environment, and occupational health. With an annual export value of US$1-1.5 million and a team of 51-100 experienced employees, Qingdao Yongke Machinery ensures timely delivery and responsive after-sales service. More than 80% of our customers have placed repeat orders after their first purchase.
● Trust Our Expertise
Since 2010, we have delivered over 200 extrusion lines to clients across North America, South America, Europe, Africa, the Middle East, and Asia. Our engineers provide free installation guidance, training, and lifetime technical support. Spare parts are available from our warehouse within 48 hours. We also offer customized solutions for specific pipe diameters, rib geometries, and output requirements. Contact us today for a detailed line layout and quotation – we are ready to help you start producing high-strength structural wall pipes efficiently.
● Frequently Asked Questions
-
Q: What raw materials can the line process?
A: The line is designed for HDPE (PE80/PE100) and can also process PP or recycled HDPE with minor modifications. -
Q: What is the maximum pipe diameter possible?
A: Our standard models support up to 2000 mm inner diameter. Custom designs can extend to 3000 mm. -
Q: How does the inner rib reinforcement improve pipe strength?
A: The ribs act as stiffeners, increasing the moment of inertia, which enhances ring stiffness without adding much weight. -
Q: Is the line fully automatic?
A: Yes, from feeding to finished pipe stacking. The PLC system controls temperature, speed, and cutting sequences. One operator can supervise the entire line. -
Q: What certifications does the line comply with?
A: The line meets ISO9001 quality standards. The produced pipes can comply with EN 13476, ASTM F2620, or other local standards upon request. -
Q: What after-sales support do you provide?
A: We offer 12-month warranty, free on-site installation supervision, operator training, and remote troubleshooting via video call. -
Q: Can we get a small-capacity line for trial production?
A: Yes, we offer a pilot model (YK-KRG-90) with output 100-200 kg/h for R&D or small-scale production.
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