What are the types of spray nozzles for silicone buttons?

The silicone button spray process is the core technology for improving product texture, touch, and lifespan, with significant differences between different processes. Based on industry demand, we will provide a detailed breakdown of the core characteristics, advantages and disadvantages, and applicable scope of mainstream processes to assist in precise selection.
The silicone button spray process can be divided into three directions based on function: color expression, tactile enhancement, and high-end protection. It can be used alone or in combination to achieve dual improvement in appearance and performance.
Firstly, there are color expression techniques, with the core of endowing buttons with rich colors to solve the problem of single color on silicone substrates, mainly including spray oil and two-color/multi-color spray oil.
Spray oil is a basic and widely used process, which achieves customized colors by spraying colored oil-based ink on the surface of silicone gel, and can achieve luminous effects. Its color is full, can be freely adjusted, has low cost, and simple process; But it has poor wear resistance, is prone to color and oil loss, and has average adhesion. Suitable for civilian products such as TV remote controls, air conditioning buttons, etc. that require low wear resistance and focus on cost.
Dual color/multi-color spray is an advanced process for spraying colored oil, which uses masking technology to spray different colors multiple times without the need for laser engraving to present a sense of layering. Its appearance is high-end and its appearance is outstanding, but the process is complex, the yield is low, the cost is high, and the wear resistance is not as good as high-end protective processes. Suitable for high-end products such as game controllers and smartwatches that emphasize appearance.
Secondly, there are techniques for improving the tactile sensation, with the core being to optimize button touch and create a skin friendly and anti slip experience, mainly including spraying tactile oil and rubber oil.
Spray feel oil, also known as matte oil spray, forms a micro matte coating by spraying matte ink, presenting a matte effect, not sticking to fingerprints, with a delicate and smooth touch, and good anti slip properties. It has a good hand feel, high cost-effectiveness, and can be reworked, but long-term friction can easily wear and expose the bottom. Suitable for high-end rice cookers, Bluetooth earphones, and other experiential home appliances and digital products.
Spraying rubber oil is a high-end tactile process, using high elasticity rubber coating to present a deep matte texture, with a soft and elastic touch and optimal anti slip performance. It has excellent tactile sensation and enhances the high-end feel of the product, but it is costly, difficult to process, and prone to peeling and detachment due to inadequate pre-treatment, which is greatly affected by the environment. Suitable for high-end products such as car air conditioning knobs and high-end game controllers.
Finally, there is the high-end protective technology, which focuses on solving the pain point of silicone buttons not being wear-resistant. The mainstream technology is spraying PU oil.
Spraying PU oil, also known as polyurethane spraying, forms a high-strength protective coating, mostly transparent or semi transparent matte, with a dry and solid touch. It has super strong wear resistance, good chemical resistance, and strong adhesion, and requires corona/plasma treatment; But the cost is high, cannot be reworked, and has extremely high requirements for the production environment. Suitable for products with high durability requirements such as car keys and industrial machinery keyboards.
In actual production, different processes can be combined to meet the requirements of color, touch, and wear resistance. Process selection should be based on product positioning, usage scenarios, and cost budgets to accurately match production needs.