Heat sealing
10 - 1
10
Heat sealing
The machine must only be operated by appropriately trained personnel! The
operating staff must also make sure that only authorized persons are in the
danger area of the machine!
10
.01
Heat-sealing principle
In order to achieve optimum heat-sealing, certain conditions concerning the workpiece and
the machine settings have to be fulfilled.
The heat-sealing tape must be:
●
heat-sealable
●
be suitable for use on the machine with regard to thickness and properties
In the seam area the material to be heat-sealed must be clean and free from parting agents
such as e.g. oil or silicone.
The basic requirements on the heat-sealing machine are:
●
the correct working temperature,
●
the correct setting of the hot-air pressure,
●
correct selection of the feed rollers,
●
optimum pressure of the feed rollers on the workpiece,
●
correct distance between the feed rollers and
●
correct sealing speed.
All settings of this machine are always dependent on the type of material being
heat-sealed.
Errors which may occur during
heat-sealing:
●
Hot-air temperature too high:
heat-sealing tape and workpiece (membrane) can
burn.
●
Hot air temperature too low:
Complete sealing of the sewn seam is not possible.
Fusing temperature for sealing tape not reached.
●
Sealing tape not completely
The seam sewn is not properly sealed. (Check the
bonded:
symmetrical and parallel alignment of the feed
rollers, hot air nozzle and sealing tape with each
other).