How a case sealer works
The filled carton enters the machine on a conveyor. Drive belts — at the sides or top and bottom — pull it through while flap folders close the top flaps and compression rollers square the box. Tape heads apply a strip of tape over the seam, fold it down the front and back panels and cut it.
Types of carton sealers
| Type | Box sizes | Flap folding | Best for |
|---|---|---|---|
| Uniform / adjustable | One size at a time, set by hand cranks | Manual or automatic | Long runs of the same case |
| Random | Mixed sizes, self-adjusting | Usually manual top flaps | E-commerce and distribution centres |
| Auto flap folding | One size or semi-random | Automatic top flap closing | Automatic lines with no operator |
| Side-belt drive | Light to medium boxes | — | Top and bottom taping in one pass |
Our carton tape sealer
The Carton tape sealer (automatic and adjustable) is an automatic, adjustable sealer for boxes 340–700 mm long, 250–500 mm wide and 200–500 mm high, sealing 10–15 boxes per minute on a 1 kW, single-phase supply. For bottom sealing at the start of the line, our NK650 automatic case erector & bottom sealer forms the case and tapes the bottom flaps in one machine.
What to check
- Smallest and largest box dimensions
- Boxes per minute
- Tape width (commonly 48 mm or 72 mm) and tape type
- Box weight and whether contents are heavy or loose
- Top only, bottom only, or top and bottom sealing
- Conveyor height to match your line
Where the carton sealer sits in the line
Case erector → case packer → carton sealer → check weigher or labeller → palletizer → pallet wrapper. See case erectors for the first step.
Questions and answers
What is the difference between a case sealer and a carton sealer?
They are the same machine. “Case sealer” is common for shipping cases and “carton sealer” or “box taping machine” for general boxes.
How many boxes per minute can a carton sealer seal?
Our carton tape sealer lists 10–15 boxes per minute; automatic line sealers can be faster depending on box length.
Can a carton sealer handle different box sizes?
An adjustable sealer handles any size within its range after a quick crank adjustment; a random sealer adjusts itself to each box.
Does a case sealer need compressed air?
Many simple tape sealers are purely electric. Auto flap folding models often use compressed air for the flap folders — confirm this in the quotation.
Related buying guides
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