In order to produce transparent PE film, water quenching must be used. If air cooling is used, the produced PE expansion film is fuzzy and translucent due to poor cooling effect. Therefore, it is an effective way to improve the transparency by properly increasing the processing temperature and adopting efficient cooling means in production.

Adding nucleating agent into PE protective film particles. Nucleating agent can replace crystal nucleus in the process of crystalline polymer processing and molding, so that polymer molecules can grow into crystals on the nucleating agent. Due to the addition of nucleating agent, the number of crystal nuclei available for crystallization at the melting point of PE protective film and PP protective film melts is greatly increased, and the crystallization speed is accelerated.

However, the crystal particles are fine, which makes the crystal not affect the transparency of the film, thus improving the crystallinity and strength of PE and PP films and improving the transparency.

Extended data:

0.5- 1% homogeneous oil is added to PE protective film particles. This homogeneous oil has good compatibility with PVC, PE, PP, PU, PC, PS, HIPS, ABS, AAS, PMMA, PET and PBT. Direct pigment powder can be dyed into uniform colored plastic with good transparency, and the uniform oil is non-toxic, and it can be molded by high-speed stirring at 50-70℃.

Polyolefin transparent additive DBS can be added to PE protective film. It is dibenzylidene sorbitol synthesized from sorbitol and benzaldehyde, and it is a nucleating agent specially used for polyolefin. It can reduce the haze of PP by 60%, LLDPE by 665,438+0%, rigidity by 8-65,438+00%, heat resistance by 9-65,438+00℃, and crystallization speed of PO by more than 65,438+0 times.