The two main material choices for boxes, cases or cartons sealing applications are hot melt adhesive and adhesive tape.
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The common operation process can be described by the following example of a machine which uses hot melt adhesive to seal boxes:
The box filled with product and with the four top flaps open is trasferred by side belts. It travels through the machine till it is stopped by gates. The front flap upon approaching is closed by frontally curved guide and back flap are closed with the help of upper lever.
One or several hot glue dispensers eject glue onto the closed flaps. The gates are opened and the box is trasferred further by side belts. The two remaining flaps are gradually closed with the help of round guides until they touch glued layer.
The top of the box is pressed down with press rollers to secure the seal. Then the sealed box is transferred for further processing, for example, printing product production and expiry date on the box.