PET preform production commonly uses precision multi-cavity molds.

      As cavity numbers increase, mold structures become more complex, and mold precision becomes increasingly important.

      For PET manufacturers, the mold is not simply a production tool. It is also a significant investment.

      Therefore, when choosing a PET injection machine, manufacturers should consider not only productivity and speed, but also mold protection.

      The LISONG PET system features super-sensitive low-pressure mold protection.

Protection Force of Only 1/30 of Normal Clamping Force

      According to the LISONG technical material, the clamping force during mold protection is only approximately 1/30 of the normal locking force.

      Low-pressure protection is not intended to complete final mold locking.

      Instead, it is used during the mold-closing stage.

      The machine closes the mold under a low protection force. If an abnormal condition occurs, the lower force can help reduce the potential risk of damage to the precision mold.

Why Is This Important for Multi-Cavity PET Molds?

      Multi-cavity molds are widely used in PET preform production because they can produce more preforms per cycle.

      However, as cavity numbers increase, the mold becomes more complex.

      Even a small abnormal condition may affect mold operation.

      Unexpected contact during mold closing can lead to mold repair costs, downtime and production interruptions.

      Therefore, mold protection is also part of production efficiency.

Protecting the Mold Means Protecting Production

      PET preform production lines often operate for long periods.

      If a mold problem occurs, the production line may need to stop for inspection or repair.

      The resulting loss is not limited to repair costs. Production capacity and delivery schedules may also be affected.

      A sensitive low-pressure mold protection function can therefore help reduce potential risks during long-term production.

Working Together with Direct Pressure Clamping

      The LISONG PET system combines low-pressure mold protection with direct pressure clamping.

      Direct pressure clamping focuses on stability during normal production. It provides reduced platen deformation and allows machine parallelism to follow the mold, helping maintain consistency between cavities.

      Low-pressure protection focuses on abnormal conditions during mold closing.

      The two functions address different stages of mold operation and complement each other.

Mold Protection Is Part of Long-Term Production

      Mold protection should not only be considered after a mold has been damaged.

      For high-cavity PET molds, precision preform molds and continuous production lines, mold protection should be considered during machine selection.

      Low-pressure mold protection does not replace proper mold installation, setup and maintenance. Correct operation remains essential.

      However, a sensitive protection system can provide an additional layer of protection at the machine level.

      The LISONG PET system uses approximately 1/30 of normal clamping force during mold protection.

      For precision PET molds, protecting the mold means protecting product quality, production efficiency and long-term investment.