(1) When designing extruded PET bottles, if the material is high-density polyethylene or polypropylene, the PET bottle should have a rectangular or elliptical cross section. For low-density polyethylene or other flexible PET bottles, the cross-section is horizontal. The cross section is preferably a circle. This facilitates the extrusion of the contents from the PET bottle. The PET parts used in conjunction with the PET bottle mouth are mainly caps and seals. The design of the PET bottle mouth should focus on how to make the PET bottle mouth better fit the lid and sealer. The bottom of the PET bottle is the weak part of the mechanical properties of the PET bottle. Therefore, the bottom of the PET bottle is generally designed to be concave; the corners of the PET bottle and the concave portion are excessively curved. In order to facilitate the stacking of PET bottles and increase the stacking stability of PET bottles, the inner bottom of the PET bottles should be designed with internal grooves.

(2) When the surface of the PET bottle is marked, the surface of the label should be flat. A “sash” can be designed on the surface of the PET bottle to make the label accurately positioned without moving. At the time of blow molding, the part of the Pet Bottle Preform that inflates the first contact always tends to be hardened first. Therefore, the wall thickness of this part is also larger. The edge and the corner part are the parts of the pet bottle preform that are inflated and finally contacted, and the wall thickness of the part is small. Therefore, the edges and horns of the PET bottle should be designed to be rounded. Changing the surface shape of the PET bottle, such as the relatively thin middle portion of the PET bottle, increases the circumferential groove or rib of the surface of the PET bottle, which can improve the rigidity and bending resistance of the PET bottle. Longitudinal grooves or ribs eliminate the offset, sagging or deformation of the PET bottle under long-term load.

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