electronic, hybride, hydralic machinery for injection molding, what to opt for?
Several decennial ago to choose for an hydraulic machine was an simple choice ..you could choose for an hydraulic or a mechanical toggle clamp injection mold machine, there were no other options, and still Hydraulic machines, are the most common machine type around world, with the exception of Japan.
Nowadays almost all injection mold machinery premium brands offer you a wide range of hydraulic or electronic drive presses. Since 1984 , made by Nissei Plastic Industrial Co., the fully electronic driven presses came into the market. Initially targeted at precision and medical molders these machines became flocking the market. Later on these machines became pretty common. And nowadays besides these tow machine type , once can find hybride machines: where for example hybrids of various types that seek an intermediate balance of cost and performance. These range from essentially hydraulic machines with only an electric screw drive to mostly electric machines that retain hydraulics for high-pressure clamping or high injection rates.
The Drawbacks of hydraulic machinery are summed here-under:
Mechanical toggle clamp
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.