Application of screen printing technology on silicone rubber keys

Silicone rubber buttons are widely used in color TV sets, air conditioners, calculators and electronic game consoles. Screen printing quality directly affects the quality of the product appearance.

1. Key mold production

Qualified mold not only to achieve the technical indicators of the keys, but also to meet the requirements of screen printing. Ensure that the key surface surface finish is high, only the smooth surface can print the character edge clear and three-dimensional words. Conversely, the rough surface printed characters must be uneven surface, the edge of the burr. The best screen printing effect is based on good mold.

2. Silicone rubber formula

The raw material formula of the silicon rubber key sheet that needs screen printing must strictly control the content of release agent, not only consider the release convenience but ignore the screen printing binding force. Release agent content is too high, printing after drying, gently wipe off. Demoulding agent is too high, transparent or white key pieces by printing drying will cause yellow phenomenon, seriously affect the appearance of the product quality.

3. Drying temperature

Post-press drying temperature is too high, often make light color and white key pieces yellow phenomenon, too low temperature will cause poor binding force. Therefore, strict control of temperature is one of the keys to ensure the binding force of printing. Drying products must be cooled before they can be loaded into the turnover box, otherwise light or white products will be yellow and affect the appearance.