High-Consistency LSR Molding Solution for Pressure Cooker Silicone Sealing Rings

Application Overview

Silicone sealing rings are important components in electric pressure cookers and other kitchen appliances. They are installed between the lid and the main body to help maintain a reliable seal during operation.

These products require consistent dimensions, suitable elasticity, and resistance to the temperature and pressure conditions specified by the appliance manufacturer.

Liquid Silicone Rubber (LSR) injection molding can be considered for manufacturers looking for a repeatable production process for precision sealing rings.

Main Production Challenges

1. Dimensional Accuracy

The inner diameter, outer diameter, cross-section, and sealing profile must match the pressure cooker structure. Dimensional deviations may affect assembly and sealing performance.

2. Heat Resistance

The selected silicone material must be suitable for the operating temperature and repeated heating cycles of the product.

3. Consistent Elasticity

The sealing ring needs to maintain its designed compression and recovery characteristics during repeated use.

4. Flash Control

Flash around the sealing surface may affect assembly and product performance. Precision mold design and appropriate process settings are therefore important.

Recommended LSR Production Solution

For suitable product designs, a complete production setup may include:

• LSR A/B dosing and mixing system

• LSR injection molding machine

• Multi-cavity precision mold

• Cold-runner system where appropriate

• Mold temperature control

• Automatic demolding

• Product inspection equipment

Multi-cavity tooling can be evaluated when the target output justifies the additional tooling investment.

Key Mold Design Considerations

The mold design should take into account:

• Ring diameter and cross-section

• Cavity balance

• Gate position

• Venting structure

• Parting-line location

• Material shrinkage

• Demolding method

For circular sealing products, uniform material filling and consistent cavity dimensions are especially important.

Quality Inspection

A suitable inspection plan may include:

• Inner and outer diameter measurement

• Cross-section measurement

• Hardness testing

• Visual inspection for flash

• Compression and recovery evaluation

• Leakage or sealing performance testing

Testing should follow the product specifications and applicable appliance standards.

Conclusion

Pressure cooker sealing rings are a practical application for precision silicone molding. Stable production requires coordination between material selection, A/B metering, mold design, injection parameters, and quality inspection.

BETTER can help evaluate the appropriate LSR dosing system and injection molding machine based on the product drawing, material specifications, mold size, and expected production capacity.

Contact BETTER for an LSR production solution for your silicone sealing rings.