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Welding and Joining Processes - Heat Sealing and Pulse Sealing
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Heat sealing or pulse sealing is a process typically used to seal thin films together or to seal film materials onto moulded parts. Typically the films used for heat sealing are laminated with a sealing layer of a thermoplastic such as polypropylene or polyethylene. When joining the 2 pieces of film to form an item such as a bag, the 2 sealing layers in contact with each other are melted together to form a strong bond.
Straight heat sealing is performed using a heated roller or heater bar to apply both heat and pressure to the joint. With pulse, or impulse sealing, the current to the heater element is pulsed to heat the joint quickly without overheating to prevent burning of the sealing layer and to allow pressure to remain on the joint while it cools. Impulse sealing produces a better quality seal than straight heat sealing, but heat sealing is simpler to set up.
Some examples of heat/pulse sealing are the sealing of wine bags seams, sealing of bag film onto moulded dispenser nozzles, sealing of beverage containers, attachment of ‘peel off’ sealing films, vacuum sealing of food packaging, bag closing sealers, and forming of ink bags for ink cartridges.
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