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The most complete unit within CUMSA’s modular vacuum range: designed to remove air completely so that the mold’s cavity can fill up without any obstacles in a uniform and quick way.
Generates vacuum and blow-off through a single channel. It operates using only compressed air.
Powered by 6BAR compressed air, the system can generate both vacuum (up to 60 L/min) and blow-off functions. This provides an efficient solution for air extraction before and during injection, ensuring complete evacuation of trapped air from the cavity.
The blow-off function also reduces maintenance on ejectors and gas vents while supporting pneumatic part ejection.
Four adjustable vacuum levels (-600, -700, -800, -900mbar), an integrated electro valve, and a built-in vacuum meter allow precise control and automated operation.
Main benefits during the process:
Reduces cycle times and increases production, lowers injection pressure and temperature, improves injection parameters, minimizes scrap rates, and delivers significant energy savings with much lower consumption than traditional vacuum pumps.
Main benefits on the plastic part:
Ensures perfect cavity filling and enhanced part quality, with superior visual appearance, uniform color, and high dimensional stability. Eliminates gas bubbles and diesel effect (burn marks), while improving mechanical strength and overall consistency.
- By the VV-SET and through the clearance of the ejectors at the same time.
- Only through the VV-SET.
- Only through the clearance of the ejectors.
- One to control the VV-SET. Is must open and close the pneumatic piston before injection. It has to be synchronized with the machine regarding the injection cycle.
- Another for the vacuum through the ejectors. Depending on the size of the ejectors and the clearance on them, the circuit should be opened and closed, if there is a lot of vacuum made through the ejector the plastic part can become deformed when ejecting. If the ejectors are small or the clearance of them is small, vacuum can be made throughout the whole cycle, no need to close the air circuit, it can be open always.
Can the vacuum unit be cleaned with ultrasound?
No, because this would damage the internal components of the system.
How can Vacuum be made with this system?
It is possible to make vacuum 3 different ways:
What is the optimal solution/recommendation to make vacuum?
Making vacuum through the VV-SET and the clearance of the ejectors, as firstly the VV-SET opens and withdraws instantly the air from within the cavity and at the same time make a depression inside it, and then the vacuum made through the ejectors will maintain the depression throughout the injection cycle.
How many signals (electro valves) must I have from the injection machine to control the vacuum process using the VV-SET and vacuum through the ejectors controlled by a VJ unit?
Two independent signals:
What can be done to increase depression in the cavity if one VACUUM JET isn’t enough?
It is matter of putting 2, 3 or 4 units more. To achieve depression the key is to take more air out from the cavity than is coming in, having multiple Vacuum Jets will enable it if for some reason the cavity isn’t hermetic enough.
What to do when I don’t achieve depression in my cavity?
When we don’t achieve depression it means that the cavity isn’t hermetically closed. This can happen due to tools that have a lot of lifters and/or cam slides where closing the cavity hermetically is difficult. When this happens a solution is to apply more than one VACUUM JET (VJ), this will increase the suction power. In order to have vacuum in a cavity we need to be able to take more air out than is coming in, this can be achieved when multiple VJ’s are applied in order to compensate the air that is coming in.
Is an external pump needed to make the Vacuum Unit work?
No, the unit makes vacuum through a venturing principal. The biggest advantage of this concept is that no auxiliary machines are needed, this is why this solution is very cost effective.
How many Bars are necessary?
Only 6 Bars (87 psi).
What is the maximum depression possible?
-920mBar (-13.30psi).
What is the maximum working temperature?
80°C (176°F).
Must I apply the CV’s upon all ejectors?
We recommend to apply the CV to all the ejector pins, even if they are not connected to the Vacuum channel.
Is it imperative to apply the Vacuum Seal on the parting line?
Yes it is, otherwise the air that is being taken out from the cavity will be coming in from the parting line.
Must the ejectors where the vacuum is going to be made have another tolerance?
Yes, -0.03mm (-0.0011”) to -0.04mm (-0.0016”), taking in mind the pocket is a H7, and depending on the plastic viscosity.
What to do if the display not shows 000 in red when the cycle is finished?
Just reset the sensor by doing a "zero point setting" or unpluging the unit.
Which is the intensite of sound of the Vacuum Units?
| Ref | Intensity of Sound |
| VJ | 90 dB. |
| VG | 90 dB. |
| VB | 80 dB. |
| SV | 75 dB. |
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