In the production of LED light strip diffusers, precision plastic extrusion technology is one of the core links, involving various issues such as material selection and process parameter control. Answers to common technical questions are provided below.
Q: What are the commonly used precision plastic extrusion materials for LED light strip diffusers, and what are their characteristics? A: Commonly used materials include PMMA (polymethyl methacrylate) and PC (polycarbonate). PMMA has high light transmittance (up to 92%), uniform diffusion effect, and good processing fluidity, making it suitable for scenarios with high light transmittance requirements; PC materials have high mechanical strength, impact resistance, and high temperature resistance, making them suitable for outdoor light strip diffusers or those with high durability requirements. The selection should be comprehensively considered based on the usage environment of the light strip (e.g., indoor/outdoor), light transmittance requirements, and cost budget.
Q: What impact do temperature parameters have on the quality of LED light strip diffusers during precision plastic extrusion, and how to control them? A: Temperature is a key factor affecting extrusion quality. If the barrel temperature is too low, it will lead to poor plasticization of the material, and streaks or bubbles are likely to appear on the surface of the diffuser; if the temperature is too high, the material may decompose, affecting light transmittance and mechanical properties. Usually, the extrusion temperature for PMMA is controlled at 180-230°C, and for PC at 240-300°C. The optimal temperature curve needs to be determined through experiments based on the material grade and equipment characteristics, with real-time monitoring and adjustment.
Q: What role does extrusion die design play in the diffusion uniformity of LED light strip diffusers? A: The runner design and die shape of the die directly affect the uniformity of melt flow. If there are dead zones in the runner or unreasonable cross-sectional changes, it will lead to uneven material flow rate, resulting in inconsistent thickness of the diffuser after cooling, thereby affecting the light diffusion effect. Precision dies need to adopt streamlined runners to ensure uniform pressure and flow rate of the melt at the die exit. At the same time, the length of the die sizing section needs to match the material characteristics to ensure the dimensional accuracy of the diffuser.
