English
Español
عربى
русский
What are the main features of a PET Preform Injection Molding Machine?
There are various features that distinguish a PET Preform injection molding machine from others. They include Hot runner, Water manifold, and valve gates, which play vital roles in the production process.
Hot runners
There are two main types of hot runners. Conventional runner machines require the molten plastic to cool, whereas heated runner machines don't. Both designs have their advantages. A heated runner reduces the amount of plastic waste. A hot runner also reduces cycle time. A conventional runner machine requires the plastic to cool before the molten material can be injected. The advantage of using a hot runner machine is that it can be used to process both colored and non-colored materials.
Water manifold
A manufactured water manifold is an engineered product that provides a convenient way to arrange several water hoses. Manifolds are designed to provide the mold water passages with the proper cooling water, collect warm, turbulent water flowing from the mold, and return the water to the machine's cooling loop. The flow rates at various ports depend on the manifold's port spacing and length.
Valve gates
The installation of valve gates is essential for the successful production of high-quality PET preforms. They prevent unacceptably large marks and provide the least amount of stress to the PET preform. Typically, these systems require a larger mold to accommodate the manifold and operating mechanism, but these systems are sometimes designed to fit without an increased footprint. In addition, valve gates are able to operate without a hot runner.
High precision
Compared with ordinary plastic injection molding machines, a high precision PET preform injection molding machine has a longer life cycle, a lower energy consumption, and a shorter forming cycle. This is because of the large diameter of the screw and the ability to reduce the air content during charging. A high-precision PET preform injection molding machine has four or more stages with a PID temperature controller. It can be equipped with synchronous ejection or a larger opening stroke.
Long lifespan
A high-quality PET preform injection molding machine is able to ensure the long-term performance of its parts. The new machine design features a box mold platen for a stable mold. In addition, it has a five-point toggle mechanism for reliable movement. Its high-geared hydraulic system and specialized nozzle for the injection of PET preforms ensure excellent accuracy and efficiency. It also features linear sensors to ensure high accuracy during injection, clamping, and ejection. The newly developed machine features a hydraulic motor that drives the alignment and movement of the mold, and is capable of saving up to 100 mold settings.
Low tolerance of part weight
A low tolerance of part weight is a significant disadvantage of using a PET preform injection molding machine. This characteristic is particularly critical when preparing molds for the process. A typical part weight variation of 1% is possible when using scientific molding. When a machine's temperature range is below one standard deviation, it will be capable of producing parts with a 0.1-0.4% tolerance. Also, a low tolerance of part weight is the reason that many manufacturers opt for a plastic injection molding machine that does not require full clamping pressure.
Impact of vibration
A high level of vibration can be detrimental to PET preforms and its production process. Vibrations can cause premature wear of the moving parts and result in high maintenance costs. Moving parts in PET injection molding machines include linear bearings, clamping systems, and tooling tapers. When the systems run fast, the amount of vibration increases and component lifetimes fall. The higher the vibration levels, the more expensive and complex the maintenance requirements.
Hot runners
There are two main types of hot runners. Conventional runner machines require the molten plastic to cool, whereas heated runner machines don't. Both designs have their advantages. A heated runner reduces the amount of plastic waste. A hot runner also reduces cycle time. A conventional runner machine requires the plastic to cool before the molten material can be injected. The advantage of using a hot runner machine is that it can be used to process both colored and non-colored materials.
Water manifold
A manufactured water manifold is an engineered product that provides a convenient way to arrange several water hoses. Manifolds are designed to provide the mold water passages with the proper cooling water, collect warm, turbulent water flowing from the mold, and return the water to the machine's cooling loop. The flow rates at various ports depend on the manifold's port spacing and length.
Valve gates
The installation of valve gates is essential for the successful production of high-quality PET preforms. They prevent unacceptably large marks and provide the least amount of stress to the PET preform. Typically, these systems require a larger mold to accommodate the manifold and operating mechanism, but these systems are sometimes designed to fit without an increased footprint. In addition, valve gates are able to operate without a hot runner.
High precision
Compared with ordinary plastic injection molding machines, a high precision PET preform injection molding machine has a longer life cycle, a lower energy consumption, and a shorter forming cycle. This is because of the large diameter of the screw and the ability to reduce the air content during charging. A high-precision PET preform injection molding machine has four or more stages with a PID temperature controller. It can be equipped with synchronous ejection or a larger opening stroke.
Long lifespan
A high-quality PET preform injection molding machine is able to ensure the long-term performance of its parts. The new machine design features a box mold platen for a stable mold. In addition, it has a five-point toggle mechanism for reliable movement. Its high-geared hydraulic system and specialized nozzle for the injection of PET preforms ensure excellent accuracy and efficiency. It also features linear sensors to ensure high accuracy during injection, clamping, and ejection. The newly developed machine features a hydraulic motor that drives the alignment and movement of the mold, and is capable of saving up to 100 mold settings.
Low tolerance of part weight
A low tolerance of part weight is a significant disadvantage of using a PET preform injection molding machine. This characteristic is particularly critical when preparing molds for the process. A typical part weight variation of 1% is possible when using scientific molding. When a machine's temperature range is below one standard deviation, it will be capable of producing parts with a 0.1-0.4% tolerance. Also, a low tolerance of part weight is the reason that many manufacturers opt for a plastic injection molding machine that does not require full clamping pressure.
Impact of vibration
A high level of vibration can be detrimental to PET preforms and its production process. Vibrations can cause premature wear of the moving parts and result in high maintenance costs. Moving parts in PET injection molding machines include linear bearings, clamping systems, and tooling tapers. When the systems run fast, the amount of vibration increases and component lifetimes fall. The higher the vibration levels, the more expensive and complex the maintenance requirements.
