Liquids & Vacuum Chamber Machines

Written By DAWN LENTZ

Liquids can begin to agitate (or boil) when exposed to reduced atmospheric pressure. The point at which this happens depends on the liquid’s composition, density, and temperature. If not managed properly, liquids may spill into the chamber or be drawn into the vacuum pump, which can negatively impact machine performance and longevity.

Reducing Liquid-Related Risks

Minipack provides several features designed to minimize the risk of liquid contamination in vacuum chamber machines:

Angled Tray

The angled tray serves two purposes:

  • For liquids: it holds the bag at a 30° angle, helping prevent spills into the chamber.

  • For solids: it can be adjusted to align the bag properly with the sealing bar.

Air Diffuser

When the vacuum releases, returning air can be forceful enough to shift the bag off the sealing bar, causing spills. The air diffuser redistributes airflow within the chamber, keeping the bag stable during this process.

Bag Size

Choosing the correct bag length is essential. Insufficient headspace increases the likelihood of liquid overflow, regardless of other features.
Recommendation: Leave 3–4 inches of headspace when filling bags.

Vacuum Level

The machine includes programmable settings that allow you to adjust the vacuum level based on the liquid’s agitation (boiling) point. Once this point is reached, air extraction stops, helping prevent liquid from boiling over. Presetting this level is key to avoiding spills.

MX Series: Designed for Liquids

The MX range of vacuum chamber machines is specifically developed for liquid applications and includes:

  • Angled tray for liquids

  • Air diffuser

  • Convex sealing system

  • Liquid control sensor

Signs of Liquid Contamination:

(1) Sealing Issues

  • Inconsistent or weak seals

  • Burnt or rapidly degrading Teflon tape

  • Sealing bar heats up, but the bag does not seal properly.

(2) Vacuum Issues

  • Pump is running, but vacuum pressure remains low.

  • Oil contamination in the pump.

  • Sight glass appears overfilled, indicating liquid may have been drawn into the pump.

Proper setup and use of these features will help maintain performance, reduce downtime, and extend the life of your vacuum chamber machine.

Minipack does not assume any responsibility or liability for the advice given and shall not be liable for any direct, indirect, special, incidental, or consequential damages in connection with the use of this information.

DAWN LENTZ
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