White PET used as shrink wrap

The white label used as a PET bottle contains a white pigment with a mass fraction of 20% to 40%, an apparent density of 1 400 to 1 800 kg/m 3, an optical density of not less than 0.70, and a temperature of 80 s for 10 s. After that, the longitudinal shrinkage is not less than 20% and the transverse shrinkage is not more than 10%. For example, the copolymers of DMT, EG and isophthalic acid synthesized are mixed with TiO2 and SiO2, dried at 160[deg.] C. for 4 h, and extruded and drawn to obtain the film described in the title.

Reprinted from: Polyester Industry