Key points of design differences of PET mineral water bottle preform mold with the same capacity
Publish Time: 2024-06-25
In the production of PET mineral water bottle preform, the design of PET mineral water bottle preform mold plays a key role in product quality and production efficiency. When faced with different capacities of preforms, the design points of PET mineral water bottle preform mold are significantly different.
For PET mineral water bottle preforms with smaller capacities, such as below 300 ml, the focus of PET mineral water bottle preform mold design is to accurately control the wall thickness of the preform. Due to the small capacity and thin bottle body, any uneven wall thickness may lead to insufficient strength or appearance defects. Therefore, the cavity design of PET mineral water bottle preform mold should be extremely fine to ensure that the plastic melt is evenly distributed during the filling process. At the same time, the gate design should be small and precisely positioned to reduce material waste and shorten the molding cycle.
For medium-capacity preforms, such as 500-750 ml, in addition to the uniformity of wall thickness, the demolding convenience of PET mineral water bottle preform mold also needs to be considered. The larger bottle size increases the difficulty of demolding, and the structure of the PET mineral water bottle preform mold should facilitate the smooth removal of the preform to avoid strain or deformation. The design of the cooling system is also more critical, ensuring that the preform shrinks evenly during the cooling process to reduce the risk of warping and deformation.
For large-capacity PET mineral water bottle preforms, such as 1 liter and above, the strength and stability of the PET mineral water bottle preform mold become the primary considerations. Large-capacity preforms exert greater pressure on the PET mineral water bottle preform mold during the molding process, and the PET mineral water bottle preform mold material needs to have higher strength and wear resistance. In addition, due to the large volume of the preform and the long flow distance of the plastic melt, the design of the gate and runner should fully consider the flow resistance of the melt to ensure complete filling. At the same time, in order to improve production efficiency, the PET mineral water bottle preform mold may adopt a multi-cavity design, but this also puts higher requirements on the balance between the cavities to ensure the consistent quality of each preform.
In short, the design points of PET mineral water bottle preform molds of different capacities have different focuses. In the actual design, it is necessary to comprehensively consider many factors such as capacity, molding process, material properties, production efficiency and cost. Through careful design and optimization, high-quality PET mineral water bottle preform mold that meets market demand can be manufactured.
