Injection Molded Rail Parts:Rail Plastic Dowel

The rail plastic dowel is a pre-embedded assembly, it is usually fixed in the pre-products (such as cement sleepers, bridges, buildings, etc.), and the threads on its surface are fused with the preform. In general, plastic dowel is used with the rail bolts or screw spike, for fastening other objects. Material: nylon glass fiber (PA66 + GF), plastic (HDPE), and so on.

Nylon dowel is made of glass fiber reinforced nylon composite material by injection molding process, both internal and external have screws.

The Features of rail plastic sleeve

Plastic dowel use high-quality nylon 66 as the base resin, it is blended and granulated by adding various modifiers. It has good mechanical strength, heat resistance, wear resistance, high rigidity and good pull-out resistance. With the advantages of simple and convenient construction, long service life, etc. It can improve the durability, insulation, environmental protection level and comprehensive technical and economic indicators of the sleeper, and meet the requirements of high-speed railway development.

The production process: injection molding by injection molding machine, and it is similar to the production process of the gauge block.

Using injection molding to produce rail plastic sleeves offers benefits like high-volume production efficiency, low cost per part, and high precision and consistency. The process is also material and color flexible, generates minimal waste by recycling scraps, and requires little to no post-processing work.

Efficiency and cost

• Fast production: Once the mold is ready, cycle times can be as short as 10-60 seconds, allowing for high production rates.

• Cost-effective: Although initial mold costs are high, the low cost per part makes it ideal for large production runs.

• Reduced labor costs: The process is largely automated, requiring fewer operators and reducing labor expenses.

Rail plastic dowels are used as a critical component in modern concrete sleeper systems to act as a foundation for fastening systems. They provide a secure connection point for bolts or screw spikes, ensure precise positioning of fasteners, and electrically insulate the fastener from the concrete sleeper. This insulation is vital for preventing electrical conductivity, protecting the concrete from damage, and enhancing the overall durability and safety of the railway track.

Primary uses

• Fastening foundation: The dowel is pre-inserted into a concrete sleeper and provides the necessary anchor point for bolts or screw spikes.

Electrical insulation: It prevents electrical current from flowing between the metal fastening components and the reinforced concrete, which is essential for safety and system integrity.

• Damage prevention: The dowel protects the concrete sleeper from damage during installation and in service, ensuring its durability.

• Precise positioning: It helps to precisely position the fastening system components on the sleeper, which is important for maintaining the correct alignment of the rail.

• Improved durability: By reducing lateral forces and protecting the concrete, plastic dowels improve the overall lifespan and performance of the sleeper and the entire fastening system.

Packaging for railway fasteners must emphasize detailed protection and standardized labeling. For surface-coated fasteners (such as zinc-plated or chrome-plated products), wrap them individually with soft flannel cloth to prevent coating scratches or abrasion. For fastener sets (e.g., bolt-nut-washer combinations), use blister packaging to secure the three components as an integrated unit. The blister pack is covered with a transparent film, facilitating visual inspection while preventing component separation. For outer packaging, reinforced corrugated cardboard boxes should be used. Clearly mark the product model, batch number, and destination code on the exterior surface of the boxes with a marker pen. Simultaneously, affix colorful moisture-warning labels with dimensions no smaller than 10cm × 10cm to ensure high visibility during logistics operations.

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GNEE RAIL specializes in the manufacture of railway fasteners and standard parts, and is a certified enterprise licensed by the Chinese Ministry of Railways. Our quality control system comprehensively covers the entire process from raw material intake to finished product shipment. The railway fasteners we produce comply with international rail industry standards, offering both connection strength and insulation with aging resistance, and are widely used in existing line electrification upgrades and intelligent track projects. GNEE provides precise customization according to detailed customer drawings or samples. From raw material selection to finished product sampling, we strictly adhere to standards, consistently delivering high-cost-effective products and professional technical consulting services to resolve fastener system compatibility challenges for global rail transit customers.

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