When the label is used on the surface of the plastic barrel, the label surface should be flat. A "frame" can be designed on the surface of the plastic bottle to accurately position the label without movement. In blow molding, the part where the parison inflates first contacts will always tend to harden first. Therefore, the wall thickness of this part is also larger. The edge and corner parts are the parts where the parison blows and finally contacts, and the wall thickness of this part is small. Therefore, the edges and corners of plastic bottles should be rounded. Changing the surface shape of the plastic bottle, for example, the center of the plastic bottle is relatively thinner, and increasing the circumferential grooves or ribs on the surface of the plastic bottle can improve the rigidity and bending resistance of the plastic bottle. Longitudinal grooves or ribs can eliminate the deviation, sagging or deformation of plastic bottles under long-term load.
The printed surface of the plastic bucket is the most focused part of consumers. The printing surface should be flat and continuous; if the plastic bottle contains handles, grooves, ribs and other structures, care should be taken in the design to not cause inconvenience to the printing operation. Oval plastic bottles have higher stiffness, but the manufacturing cost of molds is higher. Therefore, in order to ensure the rigidity of the plastic bottle, in addition to selecting the material with high rigidity, the rigidity and load resistance strength of the plastic bottle should be enhanced through the design of the plastic bottle's shape.https://www.fhpails.com/