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Process Flow of a Plastic Hose Production Line

Time：

2017-11-10

The process flow of a plastic hose production line is as follows: raw materials → high-speed mixing → low-speed cold blending → single-screw plastic extruder → sizing tank → belt-type haul-off unit → automatic cutting saw → winder. (1) Raw material mixing: PVC stabilizers, plasticizers, antioxidants, and other auxiliary additives are added to the high-speed mixer in specified proportions and sequence. The mechanical friction generated during mixing raises the material temperature to the set processing range; subsequently, a cold mixer cools the mixture down to 40–50°C, after which it can be fed into the extruder hopper. (2) Extrusion

Process flow of the plastic hose production line

Raw materials → High-speed mixing → Low-speed cold blending → Single-screw plastic extruder → Sizing tank → Belt-driven haul-off unit → Automatic cutting saw → Winder.

(1) Raw material blending: PVC stabilizers, plasticizers, antioxidants, and other additives are sequentially fed into a high-speed mixer in accordance with specified proportions and processing sequence. The friction between the materials and the mixing equipment raises the temperature to the set process target; the mixture is then transferred to a cooling mixer to reduce its temperature to 40–50°C, at which point it can be loaded into the extruder hopper.

(2) Extruder Section: This machine is equipped with a metering feed system that ensures the extrusion rate matches the feed rate, enabling stable production. Due to the design of the single-screw configuration, the feeding section features a larger diameter, providing a greater heat-transfer surface area and higher shear rates, which facilitate material plasticization. In contrast, the metering section has a smaller screw diameter, reducing both the heat-transfer area and the shear rate on the melt, thereby allowing extrusion at lower temperatures. As the screw rotates within the barrel, it plastifies the PVC compound and conveys it toward the die, achieving compaction, melting, and uniform mixing, while also facilitating venting and dehydration. The feed system and the screw drive are both controlled by variable-frequency drives, enabling synchronized speed regulation.

(3) Extrusion die section: The PVC, which has been compacted, melted, and homogenized through mixing, is conveyed by the screw to the die. The extrusion die is a critical component for pipe formation.

(4) The vacuum shaping water tank is used for shaping and cooling tubular products. It is equipped with a vacuum system and a water circulation system for shaping and cooling, features a stainless steel tank body, and employs circulating water spray cooling. Additionally, the tank is fitted with a front–rear traversing mechanism as well as manual adjustment devices for lateral and vertical positioning.

(5) The traction machine is used to continuously and automatically draw the pipe material out from the die head, with variable-frequency speed control.

(6) Cutting machine: After being controlled by a limit switch according to the required length, it performs automatic cutting and, following a delay, flips the pipe rack to enable continuous production. The cutting machine uses a fixed-length limit switch signal as its command to complete the entire cutting process, maintaining synchronization with the pipe‑material feed throughout. The cutting operation is driven by both electric and pneumatic actuators. The machine is equipped with a dust‑extraction system that promptly removes and recovers the cuttings generated during processing.

(7) Rewinder: The take-up section of a coil-processing production line, used in processing lines for paper rolls, fabric rolls, plastic rolls, and metal coils. It is designed to meet diverse process requirements; common types include simple rewinders and hydraulic rewinders. Typically, rewinders impose strict specifications on the material, including the inner diameter, outer diameter, thickness, and width of the coil.