📌Core Definition
A complete production system that processes plastic raw materials (such as PE, PVC, PP, etc.) into tubular products with fixed cross-sectional shapes and dimensions through extrusion molding technology, involving processes including plasticization, extrusion, shaping, cooling, traction, and cutting.
🔧Production Process
Raw Material Processing:Plastic pellets/powder are uniformly mixed with additives. Hygroscopic raw materials require drying.
Plasticization & Extrusion:The raw materials are heated and sheared in an extruder (single/twin-screw), melting into a uniform high-temperature melt.
Die Molding:The melt passes through an annular die (die head and mandrel) to form a tubular parison.
Sizing: The parison immediately enters a vacuum sizing tank (or internal pressure sizing device) and adheres to the sizing sleeve to achieve a precise outer diameter.
Cooling: It then enters a spray cooling water tank for full solidification and shaping.
Traction & Cutting: The pipe is pulled out at a constant speed by a caterpillar tractor and cut to the set length by an automatic cutting machine.
Post-Processing: Optional processes include marking printing, online inspection, flaring, and stacking.