/ Knowledge Base - EN / By
模型製作, 模型生產, 治具製作廠商, 模具製作廠商, 測試治具製作, 產品模型製作, 模型製作公司, 塑膠模型製作, 模型 翻模, 公仔模型製作, 公仔生產, 客 製 化模型 公仔, 樹脂公仔製作, 矽膠模具製作, pvc模型製作, 金屬模具製作, 模具製作廠商, 簡易模具製作, 塑膠模具製作流程, 矽膠模具製作, 模具開發流程, 模具設計, 塑膠模具製作流程, 模具加工流程, 汐紫模型, 3d列印代工推薦, 3d列印矽膠模具, 橡膠3d列印, 3d列印翻模, 矽膠 翻模 代 工, 3D 列印 代工 學生, 光固化代印價格, 3d列印模型, 3d列印模型製作, 3d列印公仔, 3d列印圖檔製作, 3d列印廠商, 大型3d列印代工

Vacuum Injection (Overmolding) Materials: A Guide to Optical Properties and Appearance Treatments

模型製作, 模型生產, 治具製作廠商, 模具製作廠商, 測試治具製作, 產品模型製作, 模型製作公司, 塑膠模型製作, 模型 翻模, 公仔模型製作, 公仔生產, 客 製 化模型 公仔, 樹脂公仔製作, 矽膠模具製作, pvc模型製作, 金屬模具製作, 模具製作廠商, 簡易模具製作, 塑膠模具製作流程, 矽膠模具製作, 模具開發流程, 模具設計, 塑膠模具製作流程, 模具加工流程, 汐紫模型, 3d列印代工推薦, 3d列印矽膠模具, 橡膠3d列印, 3d列印翻模, 矽膠 翻模 代 工, 3D 列印 代工 學生, 光固化代印價格, 3d列印模型, 3d列印模型製作, 3d列印公仔, 3d列印圖檔製作, 3d列印廠商, 大型3d列印代工

Vacuum Injection (Overmolding) Materials: A Guide to Optical Properties and Appearance Treatments

Introduction

For many product prototypes, appearance is a critical factor in validating the success of a design. Vacuum injection molding (overmolding) not only replicates the part’s geometry but also simulates the material’s optical properties and surface texture. Understanding the transmittance, haze, and applicable surface treatments of different overmolding materials will help you create a prototype that closely resembles the final product.

Optical Properties of Transparent Parts

For applications requiring transparent housings, lampshades, or light guides, the optical performance of the overmolding material is crucial. By selecting specific transparent PU resins, the crystal-clear texture of engineering plastics such as PC or PMMA can be highly replicated.

PC-like Transparent Parts: These materials offer transmittances exceeding 85–90%, while haze can be controlled within an extremely low range of 1–5%, combining high transparency with high toughness.

PMMA-like Transparent Parts: For ultimate transparency, PMMA-like materials can achieve transmittances as high as 90–92%, while maintaining a controllable haze of 1–3%, resulting in the clearest optical effect.

Common Appearance Treatments

Both transparent and opaque parts can be enhanced through post-processing to achieve a richer appearance. The most common surface treatments include painting (for precise color and a controllable ΔE of 1.0–1.5), printing, adhesive backing (for added functionality), and polishing (for enhanced gloss) for transparent parts.

These treatments typically require appropriate surface cleaning and pre-treatment to ensure optimal adhesion and appearance quality.

Key Concepts

  • Transmittance: This refers to the percentage of light that passes through a material. A higher value indicates a more transparent material and a clearer visual appearance.
  • Haze: This refers to the percentage of light that is scattered after passing through a material. Lower values ​​indicate clearer materials and less haze.

Conclusion

Vacuum casting (overmolding) offers a comprehensive range of optical properties, from opaque and translucent to highly transparent. PC- and PMMA-like overmolding materials, with their excellent light transmittance and low haze, are ideal solutions for optical verification. Furthermore, combined with sophisticated post-processing techniques like painting and printing, any overmolded part can be recreated with the colors and textures of your design, making your prototype even more convincing.