There are significant differences in the molding process of PP bottle preform molds with different structures.
First of all, from the perspective of the cavity layout of the mold, there are obvious differences between single-cavity molds and multi-cavity molds. The single-cavity mold structure is relatively simple and can only form one preform at a time. Its advantage is that the molding process is relatively stable and it is easy to control product quality. It is suitable for small batch production or occasions with extremely high product quality requirements. However, lower productivity is its obvious drawback. The multi-cavity mold can form multiple preforms at the same time, which greatly improves production efficiency and is suitable for mass production. However, the design and manufacturing of multi-cavity molds are more difficult and require higher processing accuracy and cooling systems. During the molding process, it is necessary to ensure that the temperature and pressure of each cavity are uniform, otherwise the product quality is prone to uneven quality.
Secondly, the gate form of the mold will also affect the molding process. Common gate forms include gates, side gates and latent gates. Point gates can realize automated production, and it is easier to remove gate traces, but the processing accuracy of the mold is high, and spraying may occur during the molding process, affecting the quality of the preform. The mold structure of the side gate is relatively simple and the cost is low, but the traces of the gate are obvious and need to be trimmed later. The latent gate can automatically cut off the gate when opening the mold. The product appearance quality is better, but the mold structure is more complex and the processing is difficult.
In addition, the cooling system of the mold also differs depending on the structure. A good cooling system can quickly and evenly reduce the temperature of the preform, shorten the molding cycle, and improve production efficiency. Some advanced molds use conformal cooling technology, that is, the shape of the cooling water channel matches the shape of the preform, which can control the temperature more effectively and improve product quality. The traditional cooling system may have problems with uneven cooling, causing deformation of the preform or internal stress.
In short, PP bottle preform molds with different structures have their own advantages and disadvantages during the molding process. When selecting a mold, it is necessary to comprehensively consider factors such as production needs, product quality requirements, and cost to select the most suitable mold structure to ensure the molding quality and production efficiency of the preform.
