What are the manufacturing processes for rubber hose fittings?

The manufacturing processes for rubber hose fittings mainly include core steps such as mixing, extrusion molding, braiding/winding reinforcement, and vulcanization. Different processing methods are used depending on the product structure and performance requirements.

The entire production process begins with raw material preparation and involves several key steps:

Raw Material Preparation and Mixing: First, natural or synthetic rubber is precisely weighed according to the formula with vulcanizing agents, plasticizers, reinforcing fillers, and other compounding agents, and then fed into a mixer or open mill for thorough mixing to form a uniform compound. This step is fundamental to ensuring the quality of subsequent processing.

Extrusion and Inner Tube Forming:The compound is continuously extruded through a screw extruder under high temperature and pressure to form a tubular preform. This process allows control over the inner diameter and wall thickness. Some processes use cored or coreless forming methods to ensure dimensional accuracy and surface smoothness.

Reinforcement Layer (Braiding/Winding):To improve pressure resistance, most industrial hoses require an additional reinforcement layer. Common methods include:

Braiding: Using polyester, nylon, or steel wire, the tube body is braided in warp and weft, suitable for medium and high pressure environments.

Winding: Using high-strength steel wire spirally wound, it can withstand pressures of 80~600MPa or even higher, and is often used in extreme conditions such as hydraulic supports and oil drilling.

Outer Rubber Layer Coating and Composite: An outer layer of rubber is extruded again outside the reinforcing layer to protect the internal structure from external abrasion, ultraviolet rays, chemical corrosion, etc. For high-performance products such as Teflon composite pipes, surface modification and special adhesives are also required to achieve a strong bond between the PTFE lining and the rubber layer.

Vulcanization and Shaping: The semi-finished product is placed in a vulcanizing tank and subjected to a vulcanization reaction under high temperature and pressure, causing the rubber molecules to cross-link into a network structure, thereby obtaining elasticity and mechanical strength. Some continuous production lines use steam or hot air continuous vulcanization processes to improve efficiency.