How the completely maufacturing process of multi-color silicone keypads?

During the hydraulic molding process, to prevent color bleed or cross-contamination between different-colored raw materials from exceeding acceptable limits, a "two-shot molding" (or secondary molding) technique is typically employed for the colored keys. This involves first hydraulically molding the colored keys using a dedicated mold; once formed and removed, they are inserted into the main mold cavity using a fixture, after which the remaining raw material is loaded for the secondary hydraulic molding process.

1. Positioning the colored keys.

2. Placing the conductive pellets (typically carbon or nickel pellets.

3. Inserting the colored keys.

4. Loading the silicone material.

5. High-temperature vulcanization molding.

6. Demolding the keypad.