How to make injection molded products with good transparency?

Analysis of raw materials, to measure the transparency of some plastics, there are many standards, such as light transmittance, haze, refractive index, birefringence, and dispersion. See whether the hardness and strength of the material are required. Transparent injection products generally use PS, SNA(AS) materials, PMMA and other materials, but they all have a brittleness problem that needs attention.


According to the light transmittance of the material, it can be divided into:

    Transparent material: the transmittance of visible light with wavelengths of 400nm-800nm is above 80%;

    Translucent material: the transmittance of visible light from 400 nm to 800 nm is between 50% and 80%;

    Opaque material: The refractive index of visible light from 400 nm to 800 nm is below 50%.

According to the above classification, resins can be divided into transparent resins: mainly including PMMA, PC, PS, PET, PES, JD series, CR-39, SAN (also known as AS), TPX, HEMA, BS (also known as K resin) Wait;

Translucent resin: PP, PA; opaque resin: ABS, POM, PTFE, PF, etc.

The principle of improving plastic transparency: reduce crystallinity, control clean quality, increase the refractive index, and reduce birefringence.

ways to improve:

Adding to improve the transparency of plastics, you can add nucleating agents, this is the most effective way to increase the light transmittance of transparent resins, it can promote the crystallization of small molecular substances. It can act as a nucleus in the resin.

Blending to improve the transparency of the plastic means adding other resins to the transparent resin to improve the transparency.