| Hybrid Direct
Clamping |
Toggle
Clamping |
 |
 |
| [1] CLAMPING FORCE |
| Clamping force is constant because of center ram construction. Direct pressure
clamping from short stroke "pancake" cylinder. Also it is very easy to adjust
clamping tonnage even during at the cycle. |
Clamping force may not remain constant due to increased temperature. This
increased temperature expands the mold and length of tie bars. No simple
positive indication of the actual clamping force. It is extremely difficult to
use less than maximum tonnage or to adjust tonnage up and down during the
cycle.
|
| [2] STRAIGHTNESS & ALIGNMENT |
| Mold open/close cylinder supported by a linear motion guide, provide for
straight travel of the movable platen and accurate alignment with the fixed
platen. |
Movable platen cannot move completely straight due to tolerance of arm
dimensions and worn links.
|
| [3] PRESSURE DISTRIBUTION |
| Direct clamping pressure by central ram construction provide even distribution
on platen. No misalignment of mold. |
There is potential for platen deflection because toggles push the corners of
the platen instead of the center of the platen.
|
| [4] MAINTENANCE |
| Hydraulic short stroke "pancake" cylinder use only a small amount of oil, which
is designed to eliminate service by the user. Hybrid clamping system is
considered a much cleaner system.
|
Toggle systems are inherently higher maintenance. Comparatively more
susceptible to wear and the need for grease and maintenance, which may bring
contamination issues.
|
