Carton closing machines, also known as carton sealers, are a vital component in semi-automated packaging lines. They are designed for one specific, high-speed task: to automatically fold and seal the top flaps of pre-filled paperboard cartons.
These machines are the perfect upgrade from slow, inconsistent manual sealing. They are designed to be fed by an operator (or an automated loader) who has already placed the product into the carton. The closer then takes over, providing a continuous-motion, high-quality seal.
By automating only the closing and sealing, these machines offer a highly cost-effective way to increase speed, improve pack presentation, and remove the “sealing bottleneck” from your production line.
This is the ideal solution for automating the end of a manual or semi-automatic line. It delivers an immediate return on investment through speed, quality, and labour savings.
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The machines can be specified with the two most common closing methods: a high-speed hot-melt glue system (for a strong, tamper-evident seal) or a mechanical tuck-in system for a simple, re-closable, and glue-free pack.
A simple, robust conveyor (often with side-grip belts or lugs) that accepts the open, filled carton from an operator and transports it at a consistent speed through the folding and sealing stations.
As the carton moves through the machine, a series of static and active mechanical guides (or 'ploughs') automatically fold the inner dust flaps and outer main flaps in the correct sequence, preparing the carton for its final seal.
Designed for flexibility, these machines feature simple, hand-crank adjustments with digital readouts. This allows operators to quickly and easily change the machine's settings (for carton height and width) to suit different production runs, minimising downtime.
These machines are built with a compact, narrow footprint, making them incredibly easy to integrate into existing manual packing lines, often fitting between the packing station and an outfeed table.
Carton
If you are manually filling cartons, a separate closer automates the folding and sealing of the top flaps.
Yes, machines can be configured for glue-less tuck closures or high-speed hot-melt glue sealing.
Most use simple hand-wheels to quickly adapt to different production runs.
Yes, “random” case sealers can automatically sense and adjust to varying box sizes on the fly.
All machines are fitted with emergency stops and safety guarding to prevent injury during sealing.
