There are many materials of plastic bottles, and the role and characteristics of different materials of plastic bottles are also different, the following is a comparison between PET plastic bottles and PP plastic bottles.
Characteristics: PE is relatively soft, waxy to the touch, lighter in quality compared to equivalent plastics, has a certain degree of transparency, and burns with a blue flame.
Toxicity: non-toxic, harmless to human body.
Polypropylene (PP) applications: microwave tableware, basins, plastic buckets, thermos shells, woven bags, etc.
Characteristics: High chemical stability, good hygienic properties, high heat resistance. Microwave tableware can be used with plastic products marked with the word PP.
Toxicity: non-toxic, harmless to human body.
The disadvantage of PP is that it is easy to oxidise and age. This is now overcome by the addition of anti-oxidants and UV absorbers.
Polyester (PET) applications: plastic beverage bottles, medicine bottles, cosmetic bottles, oil bottles and various bottle caps and insulation caps.
Characteristics: Good transparency, not easy to break, good chemical stability, suitable for a variety of liquid or solid pharmaceutical packaging. Good opacity to UV rays.
Toxicity: non-toxic.
PET plastic bottles are the mainstream of beverage packaging. The dominant beverage packaging industry in China should be PET plastic bottles, so far, no better or better packaging materials have been found to replace PET plastic bottles. PP bottles are mainly one-step method injection pull blowing and two-step method heating pull blow molding machine in the moulding of PP bottles have the advantages of bright, robust, heat-resistant. The price is cheaper than PET, PS, PE and other materials. PP plastic bottles in the beverage packaging market has gradually approached the scale of use of PET bottles, modified resins, permeating agents and mechanical equipment skills from time to time, so that PP containers can replace glass, PET and PVC containers, has a wide range of prospects.