How a continuous band sealer works

A continuous band sealer seals bags in a nonstop process. Place the filled bag on the conveyor, which carries it to the sealing area. Sealing belts guide the bag opening through a heated block, softening the film.

Pressure then closes the softened film, and a cooling block sets the seal. An embossing wheel marks the seal. The next bag follows right after, making this a continuous band sealer.

When placing a filled bag on the conveyor, make sure the open end is between the two sealing belts. These belts grip the bag opening and move it through the heated block. The bag must stand steady as it enters the belts.

The belts run continuously, so you can feed the next bag as soon as the previous one moves forward. Output depends on how quickly you load bags and the belt speed setting. Let the belts pull the bag through; pushing or holding back a bag during sealing can wrinkle the seal and cause leaks.

A single motor drives the conveyor, sealing belts, and toothed guide belts, keeping the bag opening and the bag bottom moving at the same speed. If the conveyor belt gets loose, it may fall out of sync with the sealing belts, causing the bag to shift or the seal to misalign. If this happens, tighten the conveyor belt before continuing.

Set the gap between the two sealing belts at the heated and cooling blocks to about the thickness of one layer of bag film. If the gap is too small, the belts will drag and wear out faster. If the press wheel is set too tight, it may block or fold the bag as it goes through. On the AS600F, bags enter from the right and exit on the left, so plan your filling and removal stations on the correct sides.

Choosing a band sealer for your bags

Choose a band sealer based on your bag’s weight, height, and film thickness. The FS150 and F150PM handle bags up to 3 kg, while the AS600F supports bags up to 5 kg each and 20 kg total on the conveyor. The AS600F table adjusts for bags from 120 to 600 mm high.

Film thickness can be up to 0.08 mm for the FS150 and F150PM, and from 0.04 to 0.20 mm for the AS600F. If you need to print a date or batch code, select the F150PM. The AS600F is a vertical continuous band sealer for heavier bags and sacks.

Start by weighing your heaviest filled bag. If it weighs up to 3 kg, you can use the FS150 or F150PM. For bags up to 5 kg, choose the AS600F, which can also carry up to 20 kg total on the conveyor. This is important in production settings where several bags may be on the conveyor at once, such as when sealing sacks of granulate or bulk powders.

The AS600F features a conveyor table you can raise or lower with a handwheel, so you can seal bags from 120 to 600 mm high at the right height. This is helpful if you use bags of different sizes or if your filling line changes products.

The FS150 seals films up to 0.08 mm thick in a single layer, including LDPE, MDPE, HDPE, PP, and common multilayer films. The F150PM seals LDPE, MDPE, HDPE, and PP up to 0.08 mm thick. The AS600F handles a wider range, from 0.04 to 0.20 mm in a single layer, including laminates and composite films. The FS150 and F150PM run on 220 V or 110 V, while the AS600F uses 220 V, 50 Hz. The F150PM measures 1000 × 400 × 450 mm, and the AS600F is 1195 × 500 × 1245 mm, so make sure you have enough space to load and remove bags.

Comparison of band sealer models

The table below compares the three band sealers by sealing speed, temperature, film thickness, bag weight, bag height, and special features.

To use the comparison table, first check the bag weight and film thickness for your needs, since these determine which model fits your application. Once you know which models work for your bag or film, compare sealing speed, seal type, and power supply. The heating row in the table shows the two heating tubes in the sealing block: 2 × 300 W for the FS150 and F150PM, and 2 × 400 W for the AS600F.

Printing a date or batch code on the bag

The F150PM band sealer with printer seals each bag and prints a date or batch code in one step. The printer has its own switch, and you can adjust character spacing, delay, and voltage for the print.

A code printed directly on the bag will not come off like a label can.

With the F150PM, every bag is sealed and printed in a single pass, so no bag leaves the packing area without a code.

There are no label rolls to purchase, store, or change during production.

The delay setting controls where the code appears on the bag. If you change the belt speed, the code position moves, so always check the print location after adjusting speed. If you do not need a code, the FS150 can seal the same bags: up to 3 kg, film up to 0.08 mm thick, and speeds from 0 to 13 m/min.

You adjust the printer on the F150PM using its own display. You can set the print direction to forward or reverse. The print speed setting controls how fast the code is printed: a lower value prints faster and with smaller character spacing. The gray scale and pulse width settings affect how dark and long the print is; a higher pulse width gives a longer, darker code.

To change the code, enter the new text on the printer’s display and save it before starting the next batch. Printing starts when you press the Start button. After changing the batch or date, check the code on the first sealed bag to make sure it updated. If you do not need a code on some bags, you can turn off the printer with its switch and the F150PM will seal without printing, so you can run both marked and unmarked bags on the same line.

How to set up a continuous band sealer for your film

Start with a low temperature on the continuous band sealer, then raise it until the seal holds. Adjust the speed to fit your film and bag type. For a new bag, begin at a slower speed and check the seal before increasing speed.

Increase the temperature gradually. Making a big change at once can burn the film, so small steps are safer.

Once you have the right temperature, adjust the speed. Slower belts keep the film in the heated block longer. Faster belts mean less heating time. If the seal is strong and even, you can speed up to match your production needs.

Always test the seal on real bags by pulling it apart by hand and squeezing a filled bag. A good seal is even, with no wrinkles or burnt spots. Every film type and thickness needs its own settings, so record the temperature and speed for each bag you pack. On the AS600F, you set the seal 10–20 mm from the bag edge by adjusting the table height.

Three main settings affect the seal: temperature, speed, and pressure. Pressure is factory-set for most bags and usually does not need to be changed. If you cannot get a good seal by adjusting temperature and speed, increase the pressure in small steps.

The fan cools the seal after it leaves the heated block. Whether the fan runs depends on the film material and thickness. For standard single-layer polyethylene film, the FS150 manual recommends using the fan. Polypropylene film needs a higher sealing temperature than polyethylene, so you must find a new temperature when switching from PE to PP bags. The F150PM and AS600F manuals give reference sealing speeds of 6–10.5 m/min for LDPE, MDPE, HDPE, and PP, which is well below the machines’ top speed. When using the machine for the first time or after a long break, warm up the heater at a low temperature for a few minutes to remove moisture from the heating element. While the blocks are heating, run the belts at low speed to prevent damage.

Band sealer, pedal sealer, or vacuum packing machine

A band sealer seals bags one after another on a conveyor, so production keeps moving between bags. This is ideal for packing lines where many bags are filled and sealed in sequence. The conveyor and sealing belts move each bag through the heated block, so the operator only needs to place the bag on the conveyor.

Pedal heat sealers close one bag each time you press the pedal and are better for smaller batches. Vacuum packing machines remove air from the bag before sealing, which is needed for products that must be packed without air. Band sealers do not remove air; they seal the bag with the air inside.

A band sealer is used when you have a steady flow of filled bags at a filling station, such as in a warehouse or on a production line.

A pedal heat sealer is different. The bag opening must fit the length of the sealing bar, which is 300, 450, or 600 mm, depending on the model. In contrast, a band sealer can pull a bag mouth of any length through its belts.

Both a band sealer and a constant heat pedal sealer, like the ZONE300D, keep their heated blocks at the set temperature during the shift. A band sealer needs time to warm up before the first bag and to cool down at the end of the shift, with the belts running. An impulse pedal sealer only heats when its jaws are closed, so it does not need warm-up or cool-down time.

With a pedal heat sealer, both hands are used to hold the bag flat across the sealing bar while the foot presses the pedal, sealing one bag at a time. With a band sealer, your hands are free to prepare the next bag. If the bag mouth is wider than the pedal sealer’s bar, you have to seal it in two presses, and the overlap can be a weak spot. A band sealer closes the whole mouth in one continuous seal, avoiding this issue.

A chamber vacuum packing machine only takes bags that fit flat inside its chamber and works in cycles: the lid closes, air is removed, the bag is sealed, and the chamber is vented. A vertical band sealer seals bags standing upright on its conveyor, and the AS600F can handle bags up to 600 mm tall. For heavy bags, the width of the seal matters because a wider seal supports more weight. The AS600F makes a 13 mm embossed seal, which is wider than the narrow seal made by impulse pedal sealers.

Vertical band sealers for powders and liquids

On a vertical band sealer, the bag stands upright on the conveyor. This keeps powders, granules, and liquids at the bottom of the bag and out of the seal area. The FS150 and the AS600F are vertical models, so they are used for products that would spill or leak if the bag lay flat.

A vertical model is chosen when the product must stay below the seal. Horizontal models are used for dry solids that do not shift or spill.

It is important to keep the product below the seal because any product in the seal area weakens the seal and can cause leaks.

When filling the bag, make sure the product stays well below the seal line. Let powder settle before the bag reaches the belts to avoid dust in the seal. If the bag is overfilled or the product is too close to the top, the seal may not hold.

At the machine entry, line up the open end of the bag with the guide plate so it enters the belts straight. A crooked or wrinkled entry can cause the seal to leak. Check that each bag mouth is flat and straight before it enters the belts.

On the F150PM and AS600F, the center of the seal is set 10–20 mm below the edge of the bag, so leave enough empty space at the top.

Set the conveyor so the bag stands straight under the belts. On the FS150 and F150PM, adjust the table height and move it forward or back to fit the bag size. Powders and liquids are often filled in areas that can get dusty or wet, but the F150PM and AS600F manuals require a place without corrosive or humid air.

What affects the price of a band sealer

The price of a band sealer depends on options like a built-in printer, conveyor capacity, adjustable bag height, and the range of film thickness it can seal. Ongoing costs come from wear parts such as sealer bands and motor brushes. Each model’s price is listed on its product card.

Features that affect the price include the printer on the F150PM, the conveyor load and adjustable bag height on the AS600F, and the film thickness range each model supports.

Most running costs are from electricity and wear parts, including sealer bands and guide belts. For the F150PM, printer ink is an additional expense. Each product card has a Get offer button for a quote and an Add to inquiry button to group several products in one request.

The FS150 product page recommends keeping spare sealer bands, guide belts, heating tubes, and motor brushes at the packing line.

Most of the electricity these machines use goes to the heating elements. The motors use much less power: 50 W for the FS150 and F150PM, and 120 W for the AS600F.

Maintenance and Safe Shutdown

Band sealers require daily cleaning of the sealer bands to maintain strong seals. Each month, inspect the sealer bands and toothed guide belts for wear. Check the motor carbon brushes and replace them when worn to prevent downtime.

The sealing head gets hot during use. Keep hands away from the bands while the machine is running. For the AS600F, turn off the heating first, let the cooling fan run to cool the blocks, then switch off the power.

Clean any film residue from the sealer bands and wipe down the conveyor every day.

If a band tears, it will leave marks on the seal and must be replaced right away. For the AS600F, the product page also lists checks for the heating tubes, rubber wheels, and temperature controller.

Since the sealing head is hot, always turn off the machine and let it cool before cleaning.

Clean the sealer and guide bands with a brush, and wipe the conveyor table with a damp cloth. Never use a pressure washer, and make sure no water gets into the control panel. Grease the exposed gears every six months to keep them running smoothly. If film sticks to the sealer band or heated block, stop the machine and remove the film only after the block has cooled.

The F150PM and AS600F manuals recommend replacing the heating tube if the block takes more than ten minutes to reach the set temperature. Shut down the FS150 and F150PM in the same order as the AS600F, and for all three, let the bands run until the blocks are cool. For the FS150, wait until the temperature drops below 100 °C to protect the sealer band. For the F150PM and AS600F, wait until it drops below 50 °C. Bands that break early are often stretched too tightly, running on their edge, creased, or have film or dirt stuck to them. Too small a gap at the heated blocks or too high a temperature can also cause early breakage. Never wear gloves or jewelry near the bands, and always turn off the power before leaving the machine.

Checklist Before Ordering

Before ordering, check your film type and thickness, the weight and height of your bags, how many bags you seal per day, if you need to print a code or date, the space at your filling station, and your power supply. The comparison table above lists the details for each band sealer model.

Know the film material and thickness of your bags and compare them with the film thickness row in the table above. Weigh your heaviest filled bag and measure your tallest bag to make sure they fit the model you select.

Count how many bags you seal daily and decide if each bag needs a date or batch code. Plan the space at the end of your filling station, allowing enough room for the bag to exit after sealing. Check your power socket: 220 V, or 110 V for the FS150 and F150PM.

Choose a location for the machine that is level, with at least 10 cm of clearance on all sides for ventilation. Keep it away from heat and steam, and make sure there is enough space to change the bands when needed.

The F150PM and AS600F manuals require a room temperature of 5–30 °C for proper operation. All three machines need a grounded outlet with a protective earth wire for safety.

Questions About Band Sealers

What does continuous sealing mean for a band sealer?

Continuous sealing means the band sealer seals bags one after another without stopping. The conveyor moves each filled bag through the sealing area, so production stays steady.

How heavy a bag can a band sealer handle?

The FS150 and F150PM can seal bags up to 3 kg. The AS600F can seal bags up to 5 kg each, with a total conveyor load of 20 kg.

Which films can these band sealers seal?

The FS150 seals films up to 0.08 mm thick in a single layer: LDPE, MDPE, HDPE, PP, and common multilayer films. The F150PM seals LDPE, MDPE, HDPE, and PP up to 0.08 mm thick. The AS600F seals films 0.04–0.20 mm thick in a single layer: LDPE, HDPE, PP, laminates, and composite films.

Can the machine print a date on the bag?

The F150PM can print a date or batch code on the bag while sealing. The printer settings are adjusted separately from the sealer.