Most silicone kitchen utensils require surface treatment (post-processing) before reaching their final form. The surface treatment of silicone kitchen utensils, also known as post-processing, involves various methods - each with different characteristics, applications, and costs.
Screen Printing
Screen printing is a type of porous printing in which words or symbols are transferred onto the object's surface by pressing ink through a mesh screen using a squeegee.
This process can be applied to many materials and surface types. Silicone-based printing ink is non-toxic and features strong coverage, chemical and weather resistance, excellent adhesion, and good water resistance. Through the screen printing (color separation) process, manufacturers can meet diverse customer requirements for appearance and design.
However, silicone screen printing also has certain limitations. It is suitable mainly for relatively flat surfaces. Fortunately, because silicone utensils are elastic, screen printing can still be applied to slightly curved surfaces with the aid of proper technology and auxiliary fixtures.
Pad Printing
Silicone pad printing is a specialized printing method that allows text, graphics, or images to be printed onto uneven or irregular surfaces such as planes, spheres, cylinders, and concave or convex shapes. In this process, the pattern from the printing plate is transferred to the object through a soft silicone pad.
Because the contact area of the pad is relatively small, pad printing is less suitable for large-scale designs and requires precise alignment, which can be challenging. Therefore, it is common for a single product to use both silicone screen printing and silicone pad printing together to achieve the desired visual effect.
Although the printed graphics and text remain flat after pad printing, the ink layer is slightly thicker than that of screen printing (about 0.05 mm), creating a subtle three-dimensional feel when touched.
Laser Etching (Light Shading and Transmission)
Since silicone itself is light-transmitting, laser etching can be used to engrave desired graphics or symbols on the surface of sprayed silicone, creating either opaque or light-transmitting effects.
Through laser etching, patterns or symbols can be precisely engraved on silicone surfaces to achieve the appearance required by customers. When combined with an LED light source, this process produces a visually appealing effect that makes operation panels easy to identify in low-light conditions.
Laser etching works by using focused laser beams to remove the painted surface layer, revealing the original color of the silicone material beneath it. This creates a light-transmitting effect commonly used for backlit keys or buttons.
Epoxy Coating
Epoxy coating is a surface treatment technique that seals and insulates the product surface while giving it a glossy appearance, making silicone components look similar to plastic products.
This method provides a hard top finish and a glass-like surface with a distinctive look. Printed graphics beneath the epoxy layer are well protected, and the coating also improves abrasion resistance. The typical thickness of the epoxy layer is 0.5–0.7 mm.
Spray Painting
Spray painting is a surface treatment method that applies a thin and even layer of protective material onto the object using air pressure or centrifugal force through a spray gun or atomizer.
Different coating materials and thicknesses can affect the product's texture and wear resistance while protecting printed words or images on the surface.