Injection Molding Machine
Sanmak has equipped with some super-advanced, injection molding machines with high-precision in
the past years. High performance, yet easy to operate, these highly efficient machines meet the needs
of today and beyond: They display high productivity on in-line assembly.
Ⅰ. Main Features of Our Injection Molding Machines
- The injection controller - ultimate in simplified machine operation
- High-speed and maximum output - faster mold opening and closing speeds, and a mold changing system for high cycle operations.
- Advanced clamping structure and injection parts, precise hydraulic system and circuit design
- Suitable for producing different types of precise small parts
- Automatic movement monitoring with alarm and fault diagnosis
- Short cycle times - extremely fast dry cycle times, high injection speed, parallel movements
- Perfect cleanliness - durable machine concept with encapsulated toggle levers & linear guidance of the moving platen
Ⅱ. Other Relevant Information of Injection Molding Machines
1. Definition
An Injection molding machine, also known as an injection press, is a machine for manufacturing
plastic products by the injection molding process. It consists of two main parts, an injection unit and a clamping unit.
2. Operation
Injection molding machines can fasten the molds in either a horizontal or vertical position.
The majority of machines are horizontally oriented, but vertical machines are used in some niche applications such
as insert molding, allowing the machine to take advantage of gravity. Some vertical machines also don't require the
mold to be fastened. There are many ways to fasten the tools to the platens, the most common being manual clamps
(both halves are bolted to the platens); however hydraulic clamps (chocks are used to hold the tool in place) and
magnetic clamps are also used. The magnetic and hydraulic clamps are used where fast tool changes are required.
The person designing the mold chooses whether the mold uses a cold runner system or a hot runner system to carry
the plastic from the injection unit to the cavities. A cold runner is a simple channel carved into the mold. The plastic
that fills the cold runner cools as the part cools and is then ejected with the part as a sprue. A hot runner system is
more complicated, often using cartridge heaters to keep the plastic in the runners hot as the part cools.
After the part is ejected, the plastic remaining in a hot runner is injected into the next part.
3. Types of injection molding machines
Machines are classified primarily by the type of driving systems they use: hydraulic, mechanical, electric, or hybrid.
A. Hydraulic
Hydraulic presses have historically been the only option available to molders until Nissei Plastic Industrial Co., LTD
introduced the first all-electric injection molding machine in 1983.
Hydraulic machines, although not nearly as precise, are the predominant type in most of the world, with the exception of Japan.
B. Mechanical
Mechanical type machines use the toggle system for building up tonnage on the clamp side of the machine.
Tonnage is required on all machines so that the clamp side of the machine does not open (i.e. tool half mounted on the platen)
due to the injection pressure. If the tool half opens up it will create flash in the plastic product.
C. Electric
The electric press, also known as Electric Machine Technology (EMT), reduces operation costs by cutting energy consumption
and also addresses some of the environmental concerns surrounding the hydraulic press. Electric presses have been shown
to be quieter, faster, and have a higher accuracy, however the machines are more expensive.
D. Hybrid
Hybrid injection (sometimes referred to as "Servo-Hydraulic") molding machines claim to take advantage of the best features
of both hydraulic and electric systems, but in actuality use almost the same amount of electricity to operate as an electric
injection molding machine depending on the manufacturer. 
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