Epoxy Resin Sleeve Flange Seal: Injection Process And Execution Details

In the field of power engineering and insulation equipment maintenance, the sealing quality of flange connections directly affects the reliability of system operation. For bonding requirements between epoxy bushing manufacturer and flange, the injection molding process using injection holes has become the mainstream construction method. This method injects adhesive through pre-reserved channels to completely fill the internal cavity, forming a robust mechanical anchoring and sealing interface.

Preparation and Fluid Flow Path Before Injection

Before construction begins, the dryness of the components must be checked. The injection channels inside the flange should be kept clear, removing dust or moisture. The injection hole is usually located on the side of the flange, forming a circulation loop with the vent. The adhesive ratio must strictly adhere to experimental data; after thorough mixing, vacuum treatment should be applied to prevent air bubbles from remaining inside the adhesive layer.

Core Execution Steps of the Injection Process

A constant pressure environment must be maintained during the injection process. The operator places the injection gun tip firmly against the injection hole and slowly pushes in the adhesive.

• Initial Injection Stage: Observe the spread of the adhesive in the gap and control the flow rate.

• Overflow Monitoring Stage: A continuous, bubble-free flow of adhesive from the vent indicates a dense internal fill.

• Pressure Holding and Curing Stage: Maintain pressure for a certain period after sealing the outlet to prevent backflow or shrinkage that could create voids.

Operational Specifications for Improving Bond Strength

The surface roughness of epoxy bushing for transformer is crucial to the final strength. It is recommended to physically sand the bonding area to increase the wetting surface area of ​​the adhesive. The injection environment temperature should be controlled between 20°C and 25°C, as the adhesive viscosity within this range provides optimal flow properties, allowing it to penetrate even the smallest joint gaps.

During the curing period, the components must not be moved or vibrated. Only after the adhesive has fully hardened can the next step, pressure testing, be performed to verify the sealing performance of the interface.