When choosing a PET injection molding machine, manufacturers often focus on injection speed, clamping force, screw design and cycle time.

      However, for multi-cavity PET preform production, the clamping system is equally important.

      PET preform production is typically characterized by high speed, continuous operation and large production volumes. The mold opens and closes repeatedly throughout the production day. If excessive platen deformation, mechanical friction or changes in machine parallelism occur, product consistency may be affected.

      A PET injection machine therefore needs more than sufficient clamping force. It needs a stable and reliable clamping system.

      The LISONG PET injection system adopts a direct pressure mold clamping mechanism. One of its key characteristics is reduced platen deformation. Machine parallelism can follow the mold, helping maintain consistency between different mold cavities.

Stability Through Direct Pressure Clamping

      For multi-cavity PET preform molds, every cavity needs to operate under consistent molding conditions.

      If the platen deforms significantly during mold locking, the force distribution may vary across the mold, potentially affecting cavity-to-cavity consistency.

      The LISONG direct pressure clamping structure is designed to reduce platen deformation and improve the relationship between the machine and mold.

      The objective is not simply to increase clamping force, but to improve the stability of the entire clamping process.

Low-Friction Linear Guide Rails

      The LISONG PET system also uses low-friction linear guide rails.

      A PET injection machine may perform thousands of repeated clamping movements during long-term operation. Smooth mechanical movement is therefore important for reliable production.

      Low-friction linear guide rails help the clamping mechanism move smoothly and reduce mechanical resistance during operation.

Maintenance-Free Mold Clamping

      Another important feature is the maintenance-free mold clamping system.

      Traditional clamping systems may require regular lubrication, which increases maintenance work and creates additional concerns regarding oil contamination.

      The LISONG technical material highlights a maintenance-free clamping system designed for long-term stable production, with no lubricating oil contamination in the mold clamping area.

      This can be particularly valuable for PET preforms used in food and beverage packaging.

      Stability Is the Foundation of High-Speed Production

      High injection speed is only one part of PET production.

      If the clamping system is unstable, high injection speed alone cannot guarantee long-term production performance.

      Therefore, PET manufacturers should evaluate not only injection speed and clamping force, but also platen deformation, clamping structure, mechanical movement and maintenance requirements.

      The LISONG PET system combines direct pressure clamping, low-friction linear guide rails and maintenance-free mold clamping to support stable PET production.

      High-speed production needs a stable foundation. For PET preforms, a reliable clamping system is one of the foundations for achieving consistent multi-cavity production.