High transparent PP cup
To measure the transparency of some plastics, there are many standards, there are light transmittance, haze, refractive index and dispersion, etc. See the hardness and strength of the material is required. Transparent injection molding products, the general selection of PS, SNA (AS) materials, PMMA and other materials, but they all have a brittle problem that needs attention.
PS is a versatile plastic and will not cost more than PP (transparent) The cost will be higher if the transparency of the PP (crystalline material) continues to be increased and the crystallization needs to be inhibited during the material preparation.
According to the light transmittance of the material, it can be divided into:
Transparent materials: the wavelength of 400nm-800 nm visible light transmittance of 80% or more;
Translucent material: 400 nm-800 nm Visible light transmittance between 50% -80%;
Opaque Material: 400 nm-800 nm The refractive index of visible light is below 50%.
According to the above classification, the resin can be divided into transparent resins, including PMMA, PC, PS, PET, PES, JD series, CR-39, SAN (also known as AS), TPX, HEMA, BS Wait;
Translucent resin: PP, PA; opaque resin: ABS, POM, PTFE, PF and so on.
Improve the principle of plastic transparency: lower crystallinity, control the quality of clean, improve the refractive index and reduce birefringence.
ways to improve:
Add to improve the transparency of plastics, you can add a nucleating agent, which is to increase the light transmittance of transparent resin the most effective way, it can promote the crystallization of small molecules that can play the role of nuclei in the resin.
Blending to improve the transparency of plastics, is to add other resins in the transparent resin to improve transparency.