Plastic preforms and biaxially oriented containers made therefrom

This plastic preform has a mouth, body and bottom 3 parts, and not less than 1 layer is a sandwich made of recycled polyester. In the isothermal crystallization process at 210 °C, the polyester interlayer exothermed and reached its maximum value after 70 s, ie isothermal crystallization time t ≥ 70 s. This preform is subjected to biaxially oriented blow molding to form a container, whose transparency is not affected because sharp crystallization can be suppressed even in the case of impurities in the recycled polyester. For example, the recycled PET bottle is molded into a preform (its t is 77 s), and biaxially blow molded to obtain a turbidity of 2.4 %.