Preparing The Foils To Be Jointed - Hürner HWW-1000 Manuel Utilisateur

of both the wedge and the contour rollers has to be adjusted
whenever new foils of another thickness are used.
To adjust the welding wedge and the contour roller position, place
two plastic foils exhibiting the thickness of those that are going to be
welded above and below the wedge, just as the position of the actual
foils will be during welding. Cutting them lengthwise in the area of the
wedge is recommended, in order to imitate the air channel that forms
behind the welding wedge in the course of the welding process.
During a welding operation, the welding wedge has to be cen-
tered between the foils and press them consistently against the
nip rollers. When the wedge is in the proper position, the pin at
its tip is located totally horizontally between the foils. In verify-
ing if this is the case, check whether the height of the wedge
has to be adjusted. If so, use the supplied hex key on the adjust-
ment screw in the base of the wedge welder. The longitudinal
position of the wedge in front of the nip rollers is determined
by the eyelet in the positioning disk into which the lock pin of
the catch snaps. This means that adjusting the wedge position
properly, depending on the foil thickness, requires you to pull
out the lock pin, loosen the positioning disk using the supplied
hex key, turn it so the eyelet is in the required position, and
fasten the positioning disk again.
The rollers that press the foils against the welding wedge from
above and below have to be set, using the adjustment screws,
in such a way that all 3 rollers on both sides are in the optimum
position to apply consistent pressure onto the foils. Both screws (a
hexagon head screw above, a hex key screw below) are fastened by
locking nuts. To adjust the rollers, loosen the locking nut first and
unscrew the screw to the point where it does no longer exert any
pressure on the carriage holding the rollers. For the lower adjustment
screw this requires removing the dust cover first. Then re-tighten
the screw to the point where turning it requires some force, which
indicates that it applies pressure again on the roller carriage. From
the point where you have to apply some force to turn it, tighten it a
little more, then lock it by fastening the locking nut again. Verify by
a visual check that all contour rollers are optimally positioned
on the foils, measure with an external meter and save to the
traceability data the jointing force of the rollers. When done,
reinstall the dust cover on the lower adjustment screw.
4.6

Preparing the Foils to Be Jointed

The two foils that are going to be welded have to be inserted
into the wedge welder as follows: insert the right-hand foil,
looking at the display, above the welding wedge through to the
left-hand butt; insert the left-hand foil, looking at the display,
below the welding wedge through to the right-hand butt. Both foils
to be jointed have to be prepared for welding and laid flat on the
ground for the entire length of the joint. The overlap of both has to
be approx. 15 cm (6 inches).
The plastic foils must not touch the welding wedge yet at
this point. Contact is first o.k. when the welder is "pushed
into" the plastic foils (see Sect. 4.8).
Important
Then press the  key. A screen shows that allows selecting the mate-
rial, the thickness, and the nominal temperature of the inserted foils.
Select the row you need using the ñ, ò key and press the MENU key
to open the selection screen proper. In that screen, confirm your selec-
12
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HÜRNER HWW–1000 User's Manual
H Ü R N E R S c h w e i s s t e c h n i k G m b H
Nieder-Ohmener Str. 26
35325 Mücke, Germany
Hex screw in slotted hole
(hidden)
to loosen/fasten the positioning
disk
Catch, lock pin snapped
into the disk eyelet
Adjustment Screw for Lower
Contour Rollers
cover when the product ships)
Adjustment Screw for
the Height of the
Welding Wedge
Adjustment Screw for
Upper Contour Rollers
Version September 2018
Positioning Disk
(hidden by a dust