Generally speaking, these two kinds of bottles will have seams, at least there is a mouth, which is left when the mold is closed, and the best mold will have a thin parting line.
PET commonly used plastic blister material, soft, strong toughness, good plasticity, can be made into transparent and various colors, commonly used transparent PET packaging electronics, cosmetics, toys, gifts and other products. PET is hard, good toughness, high strength, bright surface, environmental protection, transparent and multi-color sheets. The disadvantage is that it is difficult to heat PET with high frequency, and this material is often replaced by PVC by users who require products and environmental protection. PS has low density (light weight), environmental protection, very good plasticity, poor toughness and brittleness, and cannot be made into transparent materials. Therefore, it can only be made into bottom bracket type blister. Because it is easy to crack, this type of blister is not suitable for recycling. PP material is very soft, good toughness, environmental protection, and high temperature resistance. It is often used as packaging for dining utensils or other high temperature resistant products; but its plasticity is poor, processing is difficult, surface gloss is poor, and the color becomes lighter during processing.