6-inch 152mm ID PVC Core Tube

In the production process of 6-inch 152mm ID PVC core tube by Hongkai Plastic factory, strict control over raw material quality and mixing techniques is paramount. Virgin polypropylene (PP) resin serves as the base material, whose non-toxicity, chemical resistance, low density, and excellent heat resistance provide fundamental assurance for pipe performance. To enhance specific properties like impact resistance, scientifically formulated blends incorporating butadiene rubber or glass fiber can be added for modification. Raw materials and additives (such as antioxidants and lubricants) are fed into a high-speed mixer at precise ratios. Mechanical friction raises the temperature to 50-70°C, ensuring thorough blending of all components and preventing localized composition variations. This establishes a uniform foundation for subsequent extrusion molding.

The extrusion molding stage demands stringent equipment and temperature control. A single-screw extruder with a length-to-diameter ratio ≥25:1 and compression ratio of 3.0-4.0 is employed. Its screw structure is deeply adapted to PP's crystallization characteristics, ensuring thorough plasticization through compaction, melting, and mixing within the barrel. Temperature gradient design is particularly critical: the rear section (150-170°C) completes preheating, the middle section (170-190°C) promotes melting, while the front section (190-210°C) achieves uniform plasticization. Die temperature is controlled at 200-210°C (slightly below the barrel's maximum), satisfying PP's high-temperature extrusion requirements due to its high latent heat of fusion (melting point ~170°C) while facilitating pipe shaping. The mixed material is extruded into a continuous tubular blank by screw rotation. The die bore diameter must exceed the target pipe outer diameter by 1-3 mm to compensate for subsequent cooling shrinkage.

The cooling and shaping stage employs a coordinated process of vacuum sizing and water tank cooling. Upon entering the vacuum forming chamber, the hot blank adheres to the inner wall of the sizing sleeve via negative pressure. Simultaneous spray cooling rapidly solidifies the surface. The sizing sleeve's inner diameter must precisely match the target dimensions (e.g., 6-inch pipe: ID 152 mm, OD 168 mm). The pipe then passes through two serial circulating filtered cooling tanks, gradually cooling to room temperature. This effectively eliminates internal stresses and prevents deformation, ensuring structural stability.

The pulling and cutting stages emphasize speed synchronization and precision control. A crawler-type puller extracts the pipe from the die at a constant speed of 0.5-2m/min, coordinated with the extrusion rate to prevent stretching or accumulation, guaranteeing uniform wall thickness. Following online inspection (OD and wall thickness monitoring), an automatic cutter trims the pipe to a preset length of 6 meters per section and chamfers the ends to remove burrs, enhancing installation convenience.

Finally, quality inspection and packaging strictly adhere to standardized procedures. Comprehensive testing verifies pipe appearance (free of cracks or bubbles), dimensional tolerances (OD ±1%, wall thickness ±10%), and physical properties (ring stiffness, impact strength) to ensure compliance with standards like GB/T 18742.2-2017. Qualified products are marked with spray codes (specifications, production date), wrapped in plastic film, stacked on pallets, and stored in a dry, well-ventilated warehouse away from direct sunlight. This ensures product quality and traceability throughout the entire process.

Jiangsu Hongkai Plastic Technology: Customized PP Pipe Solutions, Precisely Tailored to Diverse Needs

Leveraging a comprehensive precision control system, Jiangsu Hongkai Plastic Technology offers customized dimensions for 6-inch 152mm ID PVC core tube, featuring personalized designs covering core parameters such as inner diameter, outer diameter, length, and wall thickness. For diverse industry applications (e.g., automation equipment, new energy battery manufacturing), our technical team flexibly adjusts pipe specifications based on customer drawings or performance requirements: inner diameters achieve precision within ±0.5mm, outer diameters support customization between 150-300mm, lengths are cut to order, and wall thickness control accuracy reaches ±8%.

The service process spans the entire lifecycle from requirement analysis to solution design, rapid prototyping, and mass production: Molecular-level raw material testing and simulation technology ensure custom pipes meet stringent standards for pressure resistance, temperature tolerance, and chemical compatibility. Vacuum sizing combined with intelligent traction systems achieves uniform wall thickness control even for complex dimensions. Final products undergo SGS universal safety standards and RoHS environmental certification, accompanied by full-dimension inspection reports and installation guidance.