10 - 1
Heat sealing
10
Heat sealing
The machine must only be operated by appropriately trained personnel! The
operating personnel is also responsible for ensuring that only authorized
personnel are allowed into the area of potential danger around the machine!
10
.01
The heat-sealing principle
The two workpieces which are to be connected are heated into a semi-liquid state in the area
of the seal by being brought into contact with an electrically warmed heating wedge. The
heated, semi-liquid material in the area of the seal is then pressed between the feed rollers
and thus, sealed.
To achieve a perfect heat seal, certain prerequisites must be fulfilled with regard to the
material and the machine settings.
The material to be processed must:
●
be sealable (thermoplastic),
●
have a thickness and characteristics which are suitable for processing with the machine,
●
be clean in the area of the seal.
The basic prerequisites with regard to the heat-sealing machine are:
●
form and position of the heating wedge
●
correct working temperature of the workpiece
●
selection of the correct feed rollers
●
correct pressure of the feed rollers on the workpiece
●
correct clearance between the feed rollers (penetration depth) and
●
correct heat-sealing speed.
All settings of the heat-sealing
machine are dependent on the
workpiece to be sealed. The
perfect settings must be
established by sealing a test
seal.
When sealing, the roller on the
back of the machine must be
swung in (see arrow)!
Fig. 10 - 01