(1) in the design of extruded plastic bottles, if the material is high-density polyethylene or polypropylene, the cross-section of plastic bottles should be rectangular or oval, for the material for low-density polyethylene or other flexible plastic bottles, the cross-section of the circular as well. This facilitates the extrusion of the contents from the plastic bottles. The plastic parts used in conjunction with the plastic bottle mouth are mainly caps and seals. The design of the plastic bottle neck should focus on how to make the plastic bottle mouth better fit with the lid and the sealing device. The bottom of the plastic bottle is the weak part of the mechanical properties of the plastic bottle. Therefore, the bottom of the plastic bottle is generally designed to be concave, the corner of the plastic bottle, and the concave place, all do a larger arc over. In order to facilitate the stacking of plastic bottles and increase the stability of the stacking of plastic bottles, the bottom of the plastic bottle should be designed with grooves.
(2) The surface of the plastic bottle using the label, should make the standard veneer flat. A "box" can be designed on the surface of the plastic bottle, so that the labeling is positioned accurately and does not produce movement. In blow molding, the first contact part of the Parison is always tending to be hardened. Therefore, the wall thickness of the site is also larger. The Edge and the corner part are the last contact parts of the Parison, and the wall thickness of the part is small. So the edges and corners of the plastic bottle should be designed rounded corners. Changing the surface shape of a plastic bottle, such as a relatively small plastic bottle in the middle, increasing the surface of the plastic bottle circumferential groove or convex rib, can improve the rigidity and bending resistance of plastic bottles. Longitudinal grooves or stiffeners can eliminate the displacement, droop or deformation of plastic bottles under long-term loads.