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It is possible to make vacuum 3 different ways:

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.

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.

Two independent signals:

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.

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.

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.

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.

Only 6 Bars (87 psi).

-920mBar (-13.30psi).

80°C (176°F).

We recommend to apply the CV to all the ejector pins, even if they are not connected to the Vacuum channel.

Yes it is, otherwise the air that is being taken out from the cavity will be coming in from the parting line.

Yes, -0.03mm (-0.0011”) to -0.04mm (-0.0016”), taking in mind the pocket is a H7, and depending on the plastic viscosity.

Just reset the sensor by doing a "zero point setting" or unpluging the unit.

Ref	Intensity of Sound
VJ	90 dB.
VG	90 dB.
VB	80 dB.
SV	75 dB.

Ne, protože by došlo k poškození vnitřních součástí systému.