packaging plastic film to be improved the transparency

packaging polyolefin shrink film to be improved the transparency ?Basic method to improve the transparency of polyolefin shrink film 

Some plastic transparency measure good or bad, there are many standards, transmittance, haze, birefringence, refractive index and dispersion and so on. 

Transmittance of packaging materials according to size, can be divided into: transparent packaging material: wavelength 400nm-800 nm visible light transmission rate of 80% or more; translucentpackaging materials: 400 nm -800 nm in the visible light transmittance between 50% -80%; opaque packaging materials: 400 nm -800 nm visible light, the refractive index of below 50%. According to the above categories can be divided into the transparent resin, resin: include PMMA, PC, PS, PET, PES, JD series, CR-39, SAN (also known as AS), TPX, HEMA, BS (also known as K resin) etc.; translucent resin: PP, PA; opaque resin: ABS, POM, PTFE, PF and so on. 

Improved packaging plastic transparency principle: reduce the crystallinity, clean, quality control, improve the refractive index and lower birefringence. 

Blend to improve the transparency of plastic packaging is a transparent resin, adding the other resins to improve transparency. 

Two-way stretch to improve the transparency of plasticpackaging can make the products any original crystalline particle breakage to smaller crystal size, to reach the purpose of improving light transmission.

Added to improve the transparency of plastic packaging, you can add a nucleating agent, which is to increase the transmission rate of transparent resin, the most effective method, which can promote the crystallization of small molecules. It nuclei in the resin can play the role.Primary packaging materials are: 

POF SHRINK FILM, POLYOLEFIN SHRINK FILM, BIODEGRADABEL PLASTIC FILM, PP SHRINK FILM, PE SHRINK FILM, PET SHRINK FILM, STRETCH FILM ETC. . . .