How Are the Different Rubber and Steel Layers of an Assembly Tube Bonded Together?- Ningbo Shunlong Rubber Hose Co., Ltd.

The process of bonding the different rubber and steel layers in an assembly tube, such as a high-pressure hose, is a crucial aspect of ensuring the hose's strength, flexibility, and resistance to both internal and external stresses. This process involves multiple steps, where each layer serves a specific function in contributing to the tube's overall performance and durability.

The first layer, which forms the inner lining of the hose, is made from liquid-resistant synthetic rubber. This rubber is typically extruded onto a mandrel to create a smooth and even surface. The inner rubber layer serves as the primary barrier to the liquids or gases flowing through the hose. It is designed to provide excellent resistance to chemical corrosion and ensures a smooth flow within the tube. To bond this rubber layer effectively to the hose, heat curing is often employed. The heat causes the rubber to cure and form a strong bond with the mandrel, which ensures it adheres firmly to the tube and maintains its integrity during operation.

Once the inner rubber layer is applied, steel wire braiding is added. Steel wires are typically braided or wound around the rubber layer under high tension, creating multiple layers of steel reinforcement. This braided steel layer is crucial for providing the necessary strength to the hose, allowing it to withstand high internal pressures without collapsing or rupturing. To ensure that the steel wire stays firmly in place, it is bonded to the rubber layer through a combination of mechanical interlocking and the use of bonding agents. The bonding agents are typically chemical compounds that are designed to promote adhesion between the steel wires and the rubber, creating a cohesive and durable bond. The steel wires are often treated or coated to prevent corrosion, ensuring they maintain their strength and flexibility over time.

A middle rubber layer is applied between the steel wire reinforcement and the outer rubber layer. This middle rubber layer acts as an additional buffer and provides further structural integrity to the hose. It is bonded to the steel wire reinforcement using heat and pressure. The curing process for this layer is similar to that of the inner rubber, where the rubber molecules undergo a chemical cross-linking process, forming a strong bond between the steel wires and the rubber. The curing process ensures that the middle rubber layer does not shift or detach from the steel reinforcement during use, which could compromise the hose's structural integrity.

The outer rubber layer is applied to provide weather resistance and protection from environmental factors. This outer layer is made from synthetic rubber that is specifically designed to withstand the harsh effects of UV radiation, ozone, and other external elements such as dirt, water, and extreme temperatures. The outer rubber layer is bonded to the middle rubber layer using a similar heat-curing process. During curing, the rubber molecules in the outer layer cross-link with those in the middle layer, creating a durable bond that enhances the hose's resistance to wear and tear.