When choosing a PET bottle preform injection molding machine, it is important to define the production requirements to make a choice.PET Preform Injection Molding Machine is a kind of equipment specially used for producing PET (polyethylene terephthalate) preforms.
It plays an important role in the plastic packaging industry because PET preforms are the key intermediate products for manufacturing plastic bottles such as beverage bottles, mineral water bottles, cosmetic bottles, etc.
This includes the expected capacity, product type and size range, and choosing a model that meets the requirements.
Points to note when choosing PET injection molding products
We should consider the following key factors:
- PET preform characteristics
- Injection speed and stability
- Mould and gate design
- Screw design
- Cooling system
- Automation and Intelligence
- Total life cycle cost
PET preform characteristics:
The machine needs to have high temperature and high pressure injection capability, as well as the appropriate screw structure and feeding system to ensure uniform melting of the material and injection quality.
Injection speed and stability:
Choose the model with high efficiency injection system and precise control system to ensure high quality output.
Mould and gate design:
PET preforms are usually moulded by hot runner moulds, and there should be a heat-insulating plate between the mould and the template of the injection molding machine, and the exhaust should be sufficient.
Screw design:
The L/D ratio of PET screw should be more than 1:24 to ensure good plasticising ability.
Cooling system:
A suitable cooling system can accelerate the molding cycle, improve production efficiency and ensure product quality.
Automation and Intelligence:
Consider the automation and intelligence function of the machine to improve production efficiency, reduce labour cost, and enhance product consistency and stability.
Full life cycle cost:
Consider the purchase cost, energy consumption, maintenance cost and parts replacement cost of the machine to evaluate the investment value.
By fully considering the above points, a more appropriate choice can be made to help achieve greater success in the field of PET bottle preform production.
Chooseion of screw design features for PET preform injection molding machines
When choosing a PET bottle embryo injection molding machine you need to main a screw design features include:
- Dedicated screw design
- Low shear design
- Large diameter screw
- High L/D ratio
- Optimised screw structure
- Multi-stage temperature control
Dedicated screw design:
Adopting special L/D ratio screw with extra long L/D ratio and high plasticising rate.
It ensures that PET material can be melted and plasticised uniformly and efficiently.
Low shear design:
To avoid PET molecular chain breakage under high temperature.
Therefore, the screw is designed with low shear to reduce shear heat and prevent PET thermal cracking.
Large Diameter Screw:
Larger screw diameter helps to increase melt speed and injection volume.
It also reduces the plasticising temperature and improves the transparency of the preform.
High L/D ratio: ‘Screw L/D ratio is usually 24:1, effectively control the injection stroke.
This improves the utilisation of injection volume and plasticising effect.
Optimised screw structure:
The screw assembly is made of high strength material and plated, easy to clean the residual material.
This prevents black spots, discolouration and corrosion.
Multi-stage temperature control:
The screw barrel supports four or more temperature control stages to ensure uniform melt density.
This results in consistency of physical properties and grammage of the product.
These design features work together to improve the molding efficiency and product quality of PET preforms.
Tips for choosing a PET injection molding machine by injection speed
Injection speed is a key factor when choosing a PET injection molding machine.
It is a key parameter in determining productivity, and the speed directly determines the output.
Here are some suggestions on how to choose a PET injection molding machine based on injection speed:
- Injection speed and stability
- Setting of injection speed
- Injection rate
- Influence of injection speed
- Back pressure setting
- Cooling time
Injection speed and stability:
Choose a PET injection molding machine with efficient injection system and precise control system to ensure the output of high quality products.
Injection speed setting:
The injection speed of general injection molding machine is designed between 100~150 mm/s. For high precision PET preform injection molding machine, the speed is designed between 200~500 mm/s.
Injection rate:
The injection rate is the amount of molten material (g/s) injected from the nozzle per unit time.
Choose the PET preform injection molding machine with high rate to finish the production better.
The effect of injection speed:
Too fast injection speed may lead to brittle material, while too slow may lead to premature solidification.
Therefore, the injection speed needs to be adjusted according to the specific PET product requirements.
Back pressure setting:
The lower the back pressure the better to minimise wear, usually no more than 100 bar.
Cooling time:
Optimise the cooling time to prevent warpage and ensure homogeneity.
With the above points, you can better choose the right model for PET injection molding.
These points will ensure the stability of the production process and the quality of the product.
Choose Haichen high-tech PET preform injection molding machine
Choose Haichen high-tech PET preform injection molding machine to help your preform business.
Our PET preform injection molding machine has the following advantages:
- Efficient production
- High quality PET preform injection molding machine molding
- Energy saving and environmental protection
- Multifunctionality
- User friendly
1.Efficient production:
Adopting high efficient screw design and optimised injection system.
It can significantly increase the production speed and efficiency and shorten the cycle time.
2.High quality PET preform injection molding machine molding:
Through precise temperature control and optimised cooling system, it ensures uniform melting and high quality molding of PET material.
3.Energy saving and environmental protection:
Adopting energy-saving power system and advanced plasticising unit to reduce energy consumption and cooling usage and reduce environmental pollution.
4.Multifunctionality:
Suitable for a wide range of PET preform production needs, including large gram preforms and multi-cavity molding.
5.User Friendly:
Equipped with intuitive control panel and touch screen, easy to operate and improve production efficiency.
These features make Haichen’s PET bottle preform injection molding machine an ideal choice in the industry.
Feel free to write to us for more information.
