How a chamber vacuum sealer operates

With a chamber vacuum sealer, you place the filled bag inside the chamber, positioning the open end across the sealing bar. Closing the lid starts the process. The vacuum pump removes air from the entire chamber, then the sealing bar seals the bag. The chamber vents and the lid opens automatically.

DOZE300T, DOZE400TB, and DOZE400B each offer ten programs, P0 to P9. You can set the vacuum time from 0 to 99 seconds, and both sealing and cooling times from 0 to 9.9 seconds. All three models include emergency stop and grounding protection.

To ensure a complete seal, the bag’s open end must lie flat across the sealing bar, extending just past it. The silicone strip under the lid presses the bag onto the bar during sealing for an even seal. The rest of the bag and its contents should lie flat in the chamber. If the bag mouth is not placed correctly or the silicone strip is worn, the seal may be incomplete and the pack could leak.

Each program on the DOZE300T, DOZE400TB, and DOZE400B saves three settings: vacuum time, sealing time, and cooling time. Vacuum time is how long the pump removes air from the chamber. Sealing time is how long the bar heats to melt the bag, and cooling time is how long the bar stays pressed while the seal sets. For example, a program for a specific product will store the vacuum time that gives a tight pack without crushing, and the sealing time that matches the bag, so every batch can use the same settings.

If the sealing time is too short, the seal may peel open during handling or storage. If it is too long, the bar can burn through the film and create a hole. Start with a short sealing time and increase it gradually until the seal holds.

When the chamber vents at the end of the cycle, outside air presses the bag tightly around the product, so the pack only becomes tight at the end. You can place several small bags side by side on one bar, as long as their mouths do not overlap, allowing you to seal multiple packs in one cycle.

Choosing a vacuum packaging machine for your space and output

The DOZE300T and DOZE400TB are tabletop vacuum packaging machines designed to sit on a bench. The DOZE400B is a floor-standing model with its own cabinet. The DOZE600 is a double chamber vacuum sealer on a frame, so you can load one chamber while the other runs the vacuum cycle.

The DOZE400B uses the same sealing bars and pump as the DOZE400TB, so your choice between them depends on whether you want a bench or floor model, not on output.

The chamber size determines what fits, and the sealing bars determine how many bags you can seal per cycle. The DOZE300T chamber measures 385 × 280 × 50 mm and has a single 260 mm sealing bar, fitting one bag up to 260 mm wide. The DOZE400TB and DOZE400B chambers are 440 × 420 × 75 mm with two 400 mm sealing bars, so you can seal two bags per cycle, each up to 400 mm wide. The DOZE600 has two chambers, each 540 × 670 × 50 mm, with two 620 mm bars per chamber, allowing you to seal large bags or several small bags side by side.

Height is usually the limiting factor when choosing a chamber. Always measure the filled bag as it will be packed, not just the product. A filled bag over 50 mm high will not fit in the DOZE300T or DOZE600; bags up to 75 mm high fit in the DOZE400TB or DOZE400B.

The tabletop models, DOZE300T and DOZE400TB, require a sturdy, level bench for stable use. The DOZE400B stands on its own cabinet at working height, so you load it while standing. The DOZE600 is a double chamber model on a frame, measuring 1450 × 750 × 1000 mm, and it requires a three-phase supply of 380–415 V.

DOZE300T, DOZE400TB, DOZE400B, DOZE600: comparison table

The table below compares the four vacuum packing machines by type, chamber size, sealing bars, vacuum pump, programs, power supply, and warranty.

To use the comparison table, start with the chamber row, since your filled bag must fit inside, especially its height. Next, check the sealing bars: your bag must not be wider than the bar—260, 400, or 620 mm depending on the model—and the number of bars shows how many bags you can seal per cycle. Finally, look at the supply row: only the DOZE600 needs a three-phase connection, while the others use single phase.

Where to use a commercial vacuum sealer

The DOZE300T and DOZE400TB are ideal for kitchens, butcher shops, and small-scale production where a commercial vacuum packing machine is needed for food, meat, cheese, or spare parts. Their compact size and single-phase power make them a good fit for these environments.

The DOZE400B is designed for a fixed packing station where a bench is not required, while the DOZE600 is a professional vacuum sealer built for continuous production throughout the day.

In a kitchen, the DOZE300T or DOZE400TB can be used to pack portions for refrigeration. These machines also handle liquids like soups and sauces without drawing liquid out of the bag, allowing kitchens to prepare batches ahead of time. For example, a chef can pack cooled soup in a smooth barrier bag and seal it for storage in the cooler.

In butcher or cheese shops, these machines are used to pack cut portions for customers. Each product can have its own program, so vacuum and sealing times are consistent for every pack. Vacuum-packed items take up less space in the cooler than loose bags, and clear bags keep the product visible.

Vacuum packing spare parts keeps them clean and dry during storage, and the compact packs are easy to stack. In small production, the ten programs on the DOZE300T, DOZE400TB, and DOZE400B make switching products as simple as changing the program. The DOZE400B features a stainless steel body, and the DOZE600 has stainless steel chambers, both of which can be wiped clean at the end of the shift.

Pump size and cycle time in an industrial vacuum sealer

In an industrial vacuum packing machine, the size of the vacuum pump determines the cycle time and output. The DOZE300T is equipped with a 10 m³/h pump and has a typical cycle time of 10–20 seconds, depending on the load. The DOZE400TB and DOZE400B have larger chambers and are fitted with 20 m³/h pumps. The DOZE600 uses two 20 m³/h pumps and has a cycle time of 10–40 seconds, depending on the load.

A larger chamber with the same size pump takes longer to evacuate. The DOZE400TB and DOZE400B have chambers about two and a half times the volume of the DOZE300T and use double the pump size, so they can handle larger products or more bags per cycle. However, the combination of pump size and chamber volume determines the actual cycle time.

Filler plates are used when packing smaller items in a large chamber. They reduce the empty space, so less air needs to be removed and the cycle is shorter. Filler plates also raise flat items so the bag opening is level with the sealing bar, which helps ensure a strong seal. For example, when packing thin cheese slices in the DOZE400TB, using filler plates saves time and improves sealing quality.

To estimate output, divide 3600 seconds by the cycle time and multiply by the number of bags per cycle. For instance, with a 20-second cycle and one bag per cycle on the DOZE300T, you could achieve up to 180 cycles per hour, but in practice, time is needed for loading and unloading, so the actual number will be lower.

With the DOZE600, loading can take place during the cycle, so less time is lost between cycles. Set the vacuum time only as long as needed for the product, since extra seconds add up over many cycles.

Vacuum packing machine or external sealer

A vacuum packing machine with a chamber removes air from the entire chamber, so the pressure inside and outside the bag is equal. This allows it to pack liquids, sauces, and moist items without pulling liquid out of the bag. An external vacuum sealer removes air only through the bag opening, so liquids or powders are drawn toward the machine; it is best for small, dry products.

An external vacuum sealer is suitable for a few small, dry packs. For liquids, larger packs, or high-volume packing, a chamber machine is the right choice, and all four machines here are chamber vacuum sealers. A heat sealer seals a bag without removing any air.

An external vacuum sealer requires embossed bags with channels that allow air to escape through the bag opening, while a chamber machine works with smooth bags. Smooth bags are generally less expensive than embossed ones, and this cost difference becomes significant when packing thousands of units. A chamber machine can also seal embossed bags, so any leftover stock from an external vacuum sealer can still be used.

A chamber machine achieves a higher vacuum than an external vacuum sealer because it removes air from the entire chamber, not just through the bag opening. This means less air remains in the pack. For products stored long-term, such as meat or cheese, less air in the pack helps slow down spoilage.

With two sealing bars, a chamber machine like the DOZE400TB or DOZE400B can seal two bags per cycle, while an external vacuum sealer can only seal one at a time. One operator places a bag on each bar, and one cycle produces two finished packs.

An external vacuum sealer is compact and can be put away when not in use, but a chamber machine needs a permanent spot on a bench or the floor. For example, the DOZE300T measures about 490 × 450 × 320 mm and must be placed on a bench.

Which bags a chamber machine needs

A chamber machine uses smooth vacuum bags made from a barrier film, such as a PA/PE laminate; the barrier prevents air from re-entering the bag after sealing.

The bag must fit inside the chamber with its open end positioned across the sealing bar, and the lid must close over the product. Chamber sizes and sealing bar lengths are listed in the comparison table above—compare these with your largest product, especially its height.

Choose a bag that is slightly larger than the product, so there is enough film to go over the sealing bar with some extra. Avoid using bags that are much larger than needed, as excess film can fold into the seal and cause leaks. If your products vary greatly in size, keep two or three bag sizes on hand instead of using one large size for everything. Store bags flat in their box, since a wrinkled opening may not lie flat on the bar and could cause the seal to leak.

Leave enough space between the product and the seal line so the product does not touch the seal. If the product is too close, the melted film may not bond properly, and the pack could leak. Regular PE bags will let air back in after a few days, causing the pack to lose its vacuum.

Before ordering a large quantity of bags, test by packing a sample and checking after a few days to make sure the pack is still tight. If the pack is loose, there may be a leak in the seal or the film may not have a barrier. Keep bags sealed and clean until use to prevent dust from getting into the seal area and weakening the seal.

Liquids, soft and sharp products

When packing liquids, the vacuum must stop before the liquid starts to boil at low pressure, so the vacuum time is shorter than for dry products. Set the vacuum time on the machine for each product.

Sharp edges, such as bones or metal parts, can puncture the bag under vacuum and require a thicker bag or protection for the edge.

When packing liquids, keep the bag opening higher than the liquid level. Use an angled insert or filler plate to tilt the bag, so the liquid does not reach the sealing bar. Always leave enough empty bag above the liquid so the seal area stays dry if the liquid moves or foams during the cycle.

Cold liquids boil later than warm ones under vacuum, so always cool soups and sauces before packing. This helps prevent the liquid from boiling over during the vacuum cycle. Packing warm liquids can cause bubbling that reaches the sealing area, which may weaken the seal or spill into the chamber.

Soft items like delicate cheese or bread require a program with a shorter vacuum time to prevent crushing. Assign a specific program to each type of soft product so you do not have to reset it every time. When sealing wet meat or fish, make sure to dry the bag opening, as moisture in the seal area can weaken the seal and cause leaks.

Factors That Influence Chamber Vacuum Packing Machine Pricing

The cost of a chamber vacuum packing machine is determined by the size of the vacuum pump, the number of sealing bars, the number of chambers, and whether the unit is a tabletop or floor-standing model.

You can find the current price for each vacuum packing machine on its product card above. All four models include a 12-month warranty. The price difference between the DOZE400TB and DOZE400B is due to the cabinet; the chamber, sealing bars, and pump are identical.

The main ongoing expenses are the bags, pump oil, and wear parts: the silicone strip under the lid and the PTFE cloth on the sealing bar. Bags are the largest cost, since one is used for every pack, while the strip, cloth, or oil only need to be replaced occasionally.

The DOZE600 requires a three-phase power supply. If your facility does not have a three-phase outlet, remember to include the cost of installation. For a quote, use the Get offer button on the product card or the Add to inquiry button to request several products at once.

When a Double Chamber Machine Is Worth the Investment

A double chamber vacuum packing machine like the DOZE600 is cost-effective when filled bags are ready faster than a single chamber can seal them. To test this on your current machine, count the filled bags waiting beside it during a shift. If bags are always waiting, your machine is the bottleneck and a second chamber will help; if the machine waits for bags, it is not.

With a single chamber machine, the operator waits during each cycle while the vacuum runs. With the DOZE600, the operator can load and unload one chamber while the other is running, so waiting time is used productively. This setup is ideal for steady production where bags are always ready to load as soon as a chamber is available.

For occasional packing, a single chamber machine is sufficient. Each chamber of the DOZE600 has two sealing bars, allowing you to pack large bags or several small bags at once. Make sure you have enough floor space for the DOZE600 and its three-phase supply; single chamber models operate on 220 V and require less space.

What to Check Before Ordering a Vacuum Packing Machine

Before ordering, measure the largest filled bag you plan to pack—length, width, and height—and compare these with the chamber size and sealing bar length in the table above. If your bag is taller than 50 mm, only the DOZE400TB or DOZE400B will fit.

Count how many bags you need to pack per hour and compare this with the cycle time and the number of bags per cycle. Remember to include the operator’s loading and unloading time, since this adds to each cycle on a single chamber machine. Plan for your busiest day, not just the average.

List your products: liquids, soft items, and those with sharp edges each require their own program or bag type. None of the four machines includes a gas flush function, so if your product needs gas inside the package instead of a vacuum, these models will not be suitable.

Check your power supply—single phase or three phase—and plan the location: a sturdy bench for tabletop models, floor space for the DOZE400B and DOZE600, and enough room to fully open the lid and handle full and empty bags. Also make sure that doors and hallways leading to the packing area are wide enough, especially for moving the DOZE600 on its frame.

Decide who will check the pump oil and replace the silicone strip and PTFE cloth, keep spare strips and cloths on hand, and have your first barrier bags in the right sizes ready when the machine arrives. Once installed, pack a few bags of each product, adjust the vacuum and sealing times until the packs are tight and the seals are secure, and save these as programs before starting production. The comparison table above will help you choose the right vacuum packing machine.

Care and Maintenance for Your Vacuum Packing Machine

Never operate the vacuum packing machine without a bag across the sealing bar and do not block the air hole. Check the vacuum pump oil level in the sight glass before each shift and change the oil as described in the manual.

The silicone strip under the lid and the PTFE cloth on the sealing bar are wear parts. If the strip is flattened or cracked, or the cloth is burned or torn, the seal will become uneven and may leak, so replace them as soon as you notice wear.

For the DOZE300T, DOZE400TB, and DOZE400B, the oil level in the vacuum pump should be between one third and one half of the sight glass. If the oil drops below this range, the pump may not function correctly. Keep a bottle of the oil grade specified in the manual on hand so you do not have to wait for a delivery to change the oil.

Change the oil if it becomes dark or milky. Milky oil means water has entered the pump, usually from packing moist products, and water in the oil will damage the pump over time. If you pack moist products daily, check the oil more frequently.

After use, wipe the chamber and lid with a damp cloth and mild cleaner. Do not pour water into the chamber and keep liquids away from the air hole.

Frequently Asked Questions About Vacuum Packing Machines

What kind of power supply does each vacuum packing machine need?

The DOZE300T, DOZE400TB, and DOZE400B use 220 V single phase. The DOZE600 requires a three-phase supply of 380–415 V.

How long does a vacuum packing machine cycle take?

The DOZE300T typically has a cycle time of 10–20 seconds, and the DOZE600 has a cycle time of 10–40 seconds, depending on the load. The actual time depends on the vacuum setting and the size of the product and bag.

Can these vacuum packing machines pack liquids?

Yes, chamber vacuum packing machines can pack liquids because the vacuum is applied to the entire chamber, not just the bag. This prevents liquid from being pulled out of the bag while the air is removed.

What maintenance does the vacuum pump require?

The vacuum pump is oil-lubricated. You should regularly check the oil level in the sight glass and change the oil as described in the manual to keep the machine running smoothly.