Radiator hoses are typically made through a process of extrusion, reinforcement, and curing.
Here's a breakdown of the manufacturing process:
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Inner Liner Extrusion: The process begins with extruding the inner liner. This liner is typically made of EPDM (Ethylene Propylene Diene Monomer) rubber due to its excellent resistance to heat and coolant chemicals. The EPDM is forced through a die to create a continuous tube.
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Reinforcement Layer Application: The extruded EPDM tube is then reinforced to withstand the high pressures and temperatures within the cooling system. This reinforcement typically involves applying a layer of knitted fabric. Common materials used for this fabric include:
- Polyester
- Rayon
- Kevlar (for high-performance applications)
This fabric layer is applied using specialized machinery that wraps and secures the material onto the EPDM tube.
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Outer Layer Application: An outer layer of EPDM rubber is then applied over the reinforced fabric layer. This outer layer provides additional protection against environmental factors, abrasion, and chemical exposure.
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Curing: After the layers are assembled, the hose undergoes a curing process. This process typically involves heating the hose under pressure, which vulcanizes the rubber and bonds the layers together. Curing can be achieved through various methods, including steam autoclaves or continuous vulcanization lines.
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Cooling and Cutting: Following the curing process, the hose is cooled, often by immersion in water. Once cooled, the continuous hose is cut into specific lengths according to the required dimensions of different radiator hose models.
Therefore, radiator hoses are manufactured through a multi-step process involving extrusion, reinforcement with knitted fabric, layering with EPDM, curing, and cutting.
