Custom Corrugated Hose Extrusion Line Factories & Product Solutions

Vacuum-forming draws the exterior of the hot parison against the mold cavities via negative pressure applied through microscopic mold block slits (typically 0.05 – 0.08 mm wide). This eliminates the need for high-pressure internal mandrel air, which can cause internal wall turbulence, ovality, and cooling inconsistencies. Vacuum-assisted shuttle lines allow higher linear production speeds (up to 2.5× faster), significantly sharper corrugation crest definitions, and the ability to seamlessly produce dual-wall pipes with a mirror-smooth inner bore.

Polyamide resins have sharp crystalline melting points and low melt viscosity compared to polyolefins. The extruder requires a barrier flighted screw with an L/D ratio of 30:1 to 32:1, equipped with a Maddock shear element and a distributive pineapple mixing head. Compression ratios must be moderate (2.4:1 to 2.8:1) to prevent excessive frictional shear heat, which causes polymer chain scission. Barrels must have independent ceramic heating bands and forced-air blower cooling jackets capable of maintaining zone temperatures within ±1.0°C.

Inline cuff forming is achieved through precision servo synchronization. The corrugator mold chain is loaded with paired combination blocks that contain both corrugated geometries and smooth cylindrical sections. When the smooth mold section approaches the die exit, the PLC automatically modulates the extruder melt delivery rate, internal air pressure, and corrugator drive speed to deposit a calibrated wall thickness that matches standard automotive quick-connect coupling specifications without requiring external welding.

For high-speed single-wall corrugated tubes (especially PA and PP), a non-contact planetary rotary fly-knife cutter equipped with optical or laser trough-detection sensors is essential. The optical sensor detects the exact valley of the corrugation profile at line speeds up to 60 m/min, triggering the servo knife to execute a burr-free, zero-dust cut precisely in the crest or valley. For rigid thick-wall profiles, follow-up saw blade cutters (such as our SC Series) provide chip-free right-angle cuts.

Yes, but it requires a convertible crosshead die and dual-extruder layout. For single-wall production, one extruder feeds the primary profile parison. For double-wall production, a secondary extruder feeds the inner smooth liner layer through a concentric co-extrusion die head. The corrugator must be vacuum-equipped, and an internal water-cooled cooling mandrel is inserted into the bore to calibrate and chill the smooth inner wall while the outer corrugated layer fuses to it.

We employ flow-optimized, low-residence-volume die head channels manufactured with mirror-polished (Ra < 0.05 µm) hard chrome plating. When transitioning colors or resin grades, the rheological dead-zone-free flow geometry allows rapid polymer displacement, decreasing changeover time by up to 50%. Combined with automated PLC recipe management that recalls screw RPM, temperature curves, and vacuum levels simultaneously, start-up scrap is routinely maintained below 0.8% of raw batch weight.