Heat Sealing; Heat-Sealing Principle; Heat-Sealing Process - Pfaff 8304-020 Instruction Manual

10

Heat sealing

10

Heat-sealing principle

.01
In order to achieve optimum heat-sealing, certain conditions concerning the workpiece and
the machine settings must be fulfilled.
The material 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 of the hot-wedge or the correct hot air temperature;
● the correct setting of the hot-air pressure on machines with hot-air nozzle
● the correct setting of the hot wedge to the roller gap on machines with hot wedge
● correct selection of the feed rollers (silicone or steel)
● optimum pressure of the feed rollers on the workpiece
● correct distance between the feed rollers (penetration depth adjustment) and
● correct sealing speed.
10

Heat-sealing process

.02
● Select the correct machine setting for each material (see Chapter 9 Setting up)
● Place the workpiece between the feed rollers.
● Fix the material using the foot switch .
● Using the foot switch, move the heating element into position and start the feed rollers.
● During the heat-sealing process the material must be fed manually.
● Interruption of the heat-sealing process (e.g. to change the position) the feed rollers
10 - 1
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!
All settings of this heat-sealing machine always depend on the type of material
being heat-sealed and the ambient temperature. Due to the influence of
individual operating parameters on each other, optimum settings can only be
determined through test sealings.
-Position 1 on machines with one foot switch
-Foot switch 1 on machines with two foot switches
-Position 2 on machines with one foot switch
-Foot switch 2 on machines with two foot switches
move slightly in the reverse direction
-Switching back the foot switch to position 1 (on machines with one foot switch)
-Engage foot switch 1 again (on machines with two foot switches)
Heat sealing