The hot runner design of PET bottle preform mold plays a vital role in the injection molding process, which directly affects the molding quality, production efficiency and service life of the preform. The following are several main types of hot runner design of PET bottle preform mold:
Single-point hot runner system:
The single-point hot runner system is one of the most basic hot runner designs. It delivers molten plastic directly to a single gate of the mold through a main nozzle. This design is suitable for small or medium-sized PET bottle preform molds. Its advantages are simple structure and low cost, but it may not meet the needs of large-scale or high-precision production.
Multi-point nozzle hot runner system:
For multi-cavity PET bottle preform mold, the multi-point nozzle hot runner system is an ideal choice. This system can deliver molten plastic to multiple gates at the same time by arranging multiple nozzles in the mold. This not only improves production efficiency, but also ensures more consistent molding quality of each preform.
Needle valve hot runner system:
The needle valve hot runner system is an advanced hot runner design that regulates the flow of the melt by controlling the opening and closing of the needle valve. In PET bottle preform mold, needle valve hot runner system is often used to control the filling process of bottle blanks to ensure uniform filling, no bubbles, and reduce material waste.
Sequential valve gate hot runner system:
For large or complex PET bottle preform molds, sequential valve gate hot runner system may be a better choice. This system controls the opening sequence and time of each gate to achieve orderly flow and filling of melt. This can not only improve the molding quality of bottle blanks, but also reduce mold wear and failure rate.
Balanced hot runner system:
In multi-cavity PET bottle preform mold, it is key to ensure that each cavity obtains uniform melt flow and temperature. The balanced hot runner system achieves melt balance between cavities through carefully designed runner layout and size adjustment. This helps to reduce quality differences between preforms and improve overall production efficiency.
In summary, there are various types of hot runner designs for PET bottle preform mold, each with its unique application scenarios and advantages and disadvantages. When selecting a hot runner system, it is necessary to comprehensively consider factors such as specific production requirements, mold structure, and material properties.
