Types of Injection Molding Machine is the basic plastic injection molding machine knowledge. We will talk about the PET Preform Mold types topic in two directions: injection molding machine driving technology and mechanism constructions.
Hydraulic Injection Molding
These are the oldest type of injection molding machines which have been around for centuries.
Pressure creating liquids called hydraulic oils are used to create pressure during the injection molding process. This oil is used inside a hydraulic motor, which in turn rotates the screw.One of the major considerations in the hydraulic injection is creating leak-free systems for the molding process. The hydraulic oil often leaks inside the plastic, which creates irregularities. It hence required to consider seal design carefully to cover the motor.
The technique has been present for years and is still operated by various factories in the world. The relatively lower cost and ease of maintenance of these injection molding machines have been the two major factors for people being interested in it for insert molding.
Advantages of Hydraulic Injection Machines:
Lower initial price: The base price of these machines are significantly less than its alternatives.
Cheaper parts: If a part on the machine needs to be replaced due to damage or the parts life-span reached its limit, the replacement parts are lower cost and easier to find.
Stronger parts: The hydraulic parts of the machine are more resistant to wear and tear—they are built to last.
Power: Hydraulic molding machines have exceptional clamping force.
Simple: Hydraulic molding machines have simple structure and with easy maintenance.
Easy Using: Hydraulic injection machines mostly are easy to set high-pressure clamping force.
Electrical Injection Molding
The problem with hydraulic injection molding is that even if it is effective, it is not efficient (the machine works fine, but we can’t say the same for energy consumption).
Japan introduced the first electrical hydraulic machine in the 1980s, and it has been used as an alternative to the bulkier hydraulic machine ever since.
An electrical injection molding uses high-speed servo motors. It is easy to use and is more advanced as compared to the conventional hydraulic versions.
The machine is highly cost efficient owing to the comfort and speed of production it provides. At the same time, an electric hydraulic machine needs less maintenance and has a digital control option, which means we can set the energy and pressure credentials to how much we need.
Advantages of Electric Injection Machines
Energy efficiency: Electric injection molding machines only use energy when in action—meaning the motor output is only equal to that of the load requirements.
Less-down time: There is no chance of leakage from oil. Also, no oil use means no filters to be replaced, which means consumable expenses are less.
Faster process: These machines are digitally controlled, meaning the process is entirely repeatable and needing no supervision.
Hybrid Injection Molding Machines
To some, the hybrid models promise the best of the both worlds by bringing together the benefits of an electric motor and hydraulics. Here are some of the benefits of a hybrid injection molding machine:
Diversity: the possible combinations for hybrid injection molding machines open up new degrees of design flexibility.
Best of both: Hybrid molding machines combine the energy savings and accuracy of electric molders with the force-generating capacity of a hydraulic unit.
Replaced motor: Hybrids have replaced fixed-speed DC pump motors with variable-speed AC drives so the pump only operates when required and uses the necessary amount of oil for process efficiency.
Less downtime: These require less maintenance and experience less downtime than an all-hydraulic or all-electric molding machines.
Price point: Falls nicely between all-hydraulic and all-electric molding machines, making it an affordable option. Especially for medical device manufacturers.
Advantages of Hybrid Injection Machines
Diversity: the possible combinations for hybrid injection molding machines open up new degrees of design flexibility.
Best of both: Hybrid molding machines combine the energy savings and accuracy of electric molders with the force-generating capacity of a hydraulic unit.
Replaced motor: Hybrids have replaced fixed-speed DC pump motors with variable-speed AC drives so the pump only operates when required and uses the necessary amount of oil for process efficiency.
Less downtime: These require less maintenance and experience less downtime than an all-hydraulic or all-electric molding machines.
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