Featuring high pressure resistance, flexibility, and abrasion resistance, they are widely used in garden watering, agricultural irrigation, industrial fluid transmission, and domestic water delivery. Their manufacturing follows a standardized, continuous extrusion and braiding production process, with strict process control to ensure structural stability and service performance. The detailed manufacturing steps are as follows:
1. Raw Material Proportioning and Mixing
High-quality hose production starts with precise batching and mixing. Core raw materials include PVC resin powder, plasticizers, stabilizers, lubricants and anti-aging additives, which are proportioned based on hose specifications and application scenarios. All materials undergo high-speed hot mixing for full fusion, then are cooled and stored in silos to prevent agglomeration, stabilizing subsequent extrusion quality.
2. Inner Tube Extrusion and Shaping
The blended PVC compound is melted and homogenized in a single-screw extruder, then extruded through a dedicated die to form a smooth, uniform hollow inner tube. The hot inner tube is instantly cooled and shaped in a circulating water tank to fix pipe diameter and roundness and avoid deformation. A constant-speed haul-off machine ensures consistent inner tube wall thickness and dimensional uniformity.
3. Intermediate Fiber Reinforcement Braiding
As the core process determining hose pressure and tensile resistance, fiber braiding wraps high-strength polyester yarn in a uniform crisscross or spiral mesh around the preheated inner tube. High-speed braiding equipment ensures dense, even yarn arrangement without overlap or omission. Yarn thickness and braiding density are upgraded for high-pressure hoses, and preheating improves bonding between the fiber layer and inner tube to prevent delamination.
4. Preheating Treatment Before Outer Layer Extrusion
The braided semi-finished hose is sent to a constant-temperature preheating oven to eliminate surface moisture and slightly soften the fiber mesh and inner tube surface. This step enables the outer PVC material to fully penetrate fiber gaps during subsequent coating, effectively avoiding interlayer delamination and forming an integrated composite structure.
5. Outer PVC Layer Extrusion and Coating
A second extruder coats weather, abrasion and UV-resistant PVC material evenly over the fiber braided layer via a precision die. The outer PVC layer fully encapsulates and fills the fiber mesh, integrating the inner tube, fiber reinforcement and outer protection layer as a whole. Outer layer thickness is strictly controlled to balance the hose's flexibility and wear resistance.
6. Secondary Cooling and Final Shaping
The newly coated hose enters a secondary circulating water tank for thorough cooling and solidification of the three-layer structure. This eliminates internal stress from extrusion and braiding, ensuring stable roundness, uniform wall thickness and no deformation. Synchronized traction and extrusion speeds guarantee overall dimensional consistency of the hose.
7. Surface Printing, Fixed-Length Cutting and Sealing
Cooled hoses are automatically printed with specifications, standards and manufacturer information. They are then cut into standard fixed lengths per customer requirements. Pipe ends undergo thermal sealing to lock internal fiber yarns, preventing thread loosening, water seepage and interlayer separation in use.
8. Finished Product Inspection and Winding Packaging
Finished hoses undergo comprehensive quality inspection, including appearance check, dimensional verification and sampling pressure resistance tests to meet industry standards. Qualified products are automatically wound, labeled and packaged, while defective items are screened and reprocessed to ensure factory output quality.
Process Core Characteristics
The entire manufacturing process realizes continuous automated production, with the three-layer structure tightly bonded as a whole. The inner PVC layer ensures smooth fluid delivery, the middle fiber braided layer bears tensile and pressure loads, and the outer PVC layer provides anti-abrasion, anti-UV and anti-corrosion protection. The precise cooperation of each process ensures that the PVC fiber reinforced hose has excellent flexibility, pressure resistance and long service life.
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