Colorful injection molded casings are widely used in electronic products, home appliances, toys, automotive parts and other fields due to their visual appeal and functionality. The following is a detailed explanation of its production process and core advantages:
1. Production process
Raw material selection and color matching
Substrate: commonly used engineering plastics such as ABS, PC, PP, PS, etc., requiring high fluidity, heat resistance, and stability.
Masterbatch/Color Powder: Add high concentration pigments or pre dispersed masterbatch particles to ensure uniform color. Special effects such as pearlescent and metallic effects require the use of other pigments.
Color matching verification: Confirm color matching through laboratory sampling (such as using injection molding machines or small molds).
Mold Design and Surface Treatment
Mold polishing/texture: High gloss surfaces require mirror polishing; Matte or textured finish achieved through etching.
Exhaust design: To avoid welding marks affecting color performance, exhaust grooves are usually installed at the parting line or end.
Injection molding process control
Temperature precision control: The temperature of the material barrel (usually 200-240 ℃ for ABS) and the mold temperature (60-80 ℃) affect the dispersibility of the pigment.
High speed and high-pressure injection: Shorten the filling time (usually 0.5-3 seconds) and reduce the color difference caused by the cooling of the melt front.
Pressure holding and cooling: The pressure holding (50-80% of the filling pressure) prevents shrinkage marks, and the cooling time accounts for more than 50% of the cycle.
Secondary processing (optional)
UV spraying/electroplating: enhances gloss or achieves mirror effect, requiring pre-treatment (such as plasma cleaning).
IMD (In Mold Decoration): Pre embed colored films into molds to create patterns in one go.
Quality inspection process
Color difference meter detection: Δ E ≤ 1.0 (CIE Lab standard) is qualified.
Surface defect inspection: visually inspect flow mark
2. Core advantages
High color expressiveness
It can achieve a coverage of over 90% on the color card, with a saturation better than spraying (direct melting and dispersion of pigments without coating thickness restrictions).
Cost and efficiency advantages
Eliminating the post spraying process (traditional spraying requires multiple processes such as primer, color paint, UV paint, etc.) and shortening the cycle.
Durability improvement
The integrated color layer is scratch resistant and solvent resistant (such as no peeling when wiped with alcohol).
Environmental compliance
No VOC emissions (compared to spraying processes), compliant with RoHS/REACH regulations.
Flexible design
Gradient colors can be achieved through dual color injection molding or screw mixing technology, such as the gradient color of electric toothbrush handles.
Guangdong Yingtai High Precision Technology Co., Ltd. optimizes materials and processes, and the brightly colored injection molded casing can balance aesthetics and functionality, becoming a solution for high value-added products such as consumer electronics.
