When people discuss PET injection molding machines, injection speed is often the first specification they consider.

      High-speed injection is certainly important for PET preform production, especially when multi-cavity molds are used.

      However, speed alone does not guarantee stable production.

      The condition of the plasticized material is equally important.

      The LISONG PET injection system uses a PET-specific twin-screw structure, designed around the requirements of PET processing.

Low Speed, High Plasticization

      The LISONG technical material highlights the combination of low screw speed and high plasticization capability.

      The objective is not simply to increase screw speed, but to achieve stable plasticization at a relatively low speed.

      PET material needs to be conveyed, melted and plasticized before injection.

      If the plasticization process is unstable, consistent injection parameters alone may not guarantee consistent products.

Stable Temperature, Plasticization and Density

      The PET system material describes the twin-screw structure as a foundation for stable temperature, plasticization and material density.

      These conditions are important for PET preform production.

      Stable temperature supports consistent melting.

      Stable plasticization helps maintain similar material conditions between cycles.

      Stable material density contributes to consistent molding conditions.

      Together, these provide a foundation for fast and precise injection.

Why Is Injection Speed Alone Not Enough?

      A machine may have very high injection speed, but if the material is not plasticized consistently, high speed cannot automatically produce high-quality preforms.

      PET production requires a complete molding process.

      The material must first reach a stable plasticized condition before entering the mold.

      Therefore, plasticization and injection need to work together.

Synchronized Injection, Pressure Holding and Material Storage

      The LISONG PET system also provides synchronized material storage during injection and pressure holding.

      While the current product is being injected and pressure-held, material preparation for the next cycle can take place.

      This allows different operations within the cycle to work more efficiently together.

      For high-speed PET production, reducing unnecessary waiting time can contribute to better cycle efficiency.

AA Value Control

      PET preforms used for beverage packaging are also concerned with indicators such as AA value.

      The LISONG PET technical material states that the PET-specific twin-screw structure helps control AA value through stable plasticization and provides relevant testing data meeting carbonated beverage standards.

      For beverage packaging manufacturers, this information can be an important reference when evaluating PET equipment.

Stable Plasticization Supports High-Speed Production

      PET production is not simply about increasing injection speed.

      A high-performance PET system needs to balance plasticization, injection, pressure holding, material storage and product quality.

      The LISONG PET twin-screw structure combines low-speed, high-capacity plasticization with fast and precise injection and synchronized material storage.

      For each specific PET project, actual plasticization performance should still be evaluated according to material, product specification, mold and process parameters.

      Injection speed determines production rhythm, while stable plasticization helps make high-speed production sustainable.