HDPE Jacket pipe extrusion line for pre-insulated pipe is designed by Qingdao Huashida Machinery Co., LTD. It absorbs and improves developed HDPE pipe extruding technology.
The production line is an integration design composed by extrusion, vacuum calibrating, cooling, pulling, cutting, stacker. Great performance in automatic operation, extrusion capacity, steady and service life etc. Especially compared with the line use internal pressure method, vacuum calibrating method is much better than it for stiffness, pressure resistance and surface smooth.Vacuum calibrating method pre-insulation pipe outside casing extruded line is the advanced and popular machinery in the world.
1.High strength and toughness, smooth surface
2.Uniform wall thickness and excellent pressure resistance
3.Superior resistance to environmental stress cracking and impact at low temperatures
HDPE Jacket Process Flow:
Vacuum feeding PE granule-->hot air dry material-->extrusion plasticizing-->mold shaping-->Vacuum sizing-->water cooling-->Pulling out-->cutting pipe-->carrier laying-off pipe
Screw System: Solid-Liquid Separation & High-Efficiency Plasticization
Adopts next-generation solid-liquid separation screw technology (industry-leading in China);
Multi-zone structure: feeding, separation, plasticizing, homogenizing, and mixing sections;
Long L/D ratio for excellent plasticization;
Extended feeding system ensures fast and stable material compression;
Thermal isolation design prevents heat transfer to the feeding section;
High-speed gearbox and powerful motor for enhanced extrusion efficiency;
Production efficiency improved by approx. 30%, and heating energy consumption reduced by 20%.
Die Head System: Precision Molding & Stress-Relief Design
Made from high-strength alloy steel, resistant to deformation under high temperature and pressure;
Multi-layer spiral flow channels with polished and chrome-plated surfaces for smooth flow;
Counter-rotation design helps release extrusion stress and reduce pipe bursting risk;
Optimized expansion and contraction angles ensure good melt flow and axial strength;
Extended straight section increases radial and axial rigidity;
Supports LDPE, HDPE, and mixed PE materials, lowering production cost.
Control System: Centralized Control & Intelligent Operation
Equipped with a Siemens PLC centralized control system
Custom-designed software integrates system and HMI interaction
One-button control for speed, wall thickness, and production capacity
Supports remote monitoring and fault diagnosis
Easy operation, safe and labor-saving
Planetary Cutter: Hough Block Positioning & Precision Cutting
Features Hough block clamping structure to prevent pipe deformation during cutting;
Ensures vertical and smooth cut surfaces without secondary processing;
Equipped with dust collection system for a clean working environment.
Based on German extrusion technology with independent innovation;
High automation, energy-efficient and reliable;
Compatible with various polyethylene materials;
Safe operation, easy maintenance, and long service life.
District heating pipeline systems
Oil and chemical insulation pipelines
Municipal water supply and drainage projects
Liquid and gas transmission systems
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