A dent in a plastic bottle, often seen as a concave shape at the bottom, serves multiple purposes. It's primarily designed to strengthen the bottle's base and improve its stability, allowing it to stand upright on a flat surface. This indentation also plays a role in the manufacturing process, acting as a pinch-off mark from the mold during blow molding. In some cases, it can also help manage thermal expansion and contraction, particularly in milk jugs where it can prevent spillage.
A dent in a plastic bottle, often seen as a concave shape at the bottom, serves multiple purposes. It's primarily designed to strengthen the bottle's base and improve its stability, allowing it to stand upright on a flat surface. This indentation also plays a role in the manufacturing process, acting as a pinch-off mark from the mold during blow molding. In some cases, it can also help manage thermal expansion and contraction, particularly in milk jugs where it can prevent spillage.