The forming principle of PET bottles: PET bottles are formed by the filling of gun molds under a certain temperature and pressure. They can be formed by processing Pet Preform or directly by injection molding.
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 portion where the parison inflates first contacts always tends to be hardened first. Therefore, the wall thickness of this part is also larger. The edge and the corner portion are the portions of the parison that are inflated and contacted, and the wall thickness of the portion 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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