Note: Descriptions are shown in the official language in which they were submitted.
CA 02736717 2016-06-02
REPAIR NOZZLE
[0002] The present invention relates to a nozzle for producing, in particular
for
recreating and restoring, adhesive and/or sealant beads for structures in the
automotive
sector.
[0003] In automotive sector mass production such beads are applied
automatically by
application robots. The beads serve to adhesively bond sheet metal parts or
insulation
against noise or temperature, or are used for sealing. The robot nozzles used
are as a
rule made of metal and must have long service lives, to prevent failure of the
application
robot due to a defective robot nozzle during mass production. Subsequent
application of
adhesives and/or sealants for example to restore or recreate a defective
structure in the
automotive sector, in particular after an accident, is not possible with the
known mode of
application using a robot nozzle. The after market, in particular most auto
shops, do not
have the necessary application robot at their disposal. In addition, just
purchasing a
special robot nozzle for a specific application is not sensible for the after
market, in
particular the repair market, due to the high cost of a robot nozzle.
[0004] It is therefore an aspect of the invention to provide a nozzle for the
after market
and in particular for the repair market for discharging adhesives and/or
sealants in the
automotive sector, in order to restore and/or reproduce mass-produced
structures.
[0005] According to an aspect of the present invention, there is provided a
repair nozzle
for discharging adhesives and/or sealants usable in the automotive sector from
a
cartridge containing them by means of an associated cartridge gun, having a
proximal
product feed end, which comprises means for detachably fastening the repair
nozzle to
the cartridge and a projecting collar for resting on the cartridge gun, and
having a distal
product discharge end, which comprises a slot-shaped mouth orifice for
discharging an
adhesive and/or sealant bead, wherein a product channel is provided, for
conveying the
adhesive and/or sealant from the product feed end to the product discharge
end, and an
end cap comprising the slot-shaped mouth orifice is formed on the product
discharge
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=
end, which is curved in the distal direction of the repair nozzle, and wherein
the slot-
shaped mouth orifice extends over a summit of curvature of the curved end cap.
[0006] Advantageous configurations of the invention are indicated in the
subclaims.
[0007] The basic concept behind the invention is the use of a repair nozzle to
discharge
adhesives and/or sealants usable in the automotive sector from a cartridge
and/or a
tubular bag or film pouch by means of an associated
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dispensing gun, such as for example a cartridge gun with a proximal product
feed end, which comprises means for detachably fastening the nozzle to the
cartridge and a projecting collar for resting on the cartridge gun and/or the
cartridge itself, and with a distal product discharge end, which comprises a
slot-
shaped mouth orifice for discharging an adhesive and/or sealant bead.
[0008] The adhesives and/or sealants used are preferably high-viscosity
adhesives and/or sealants which are conventionally used in particular in mass
production in the automotive sector. These adhesives and/or sealants are
contained in a cartridge. These cartridges may consist for example of a
plastics
material or of aluminum. In general, the cartridges comprise a cylindrical
body,
a movable piston being provided at one end for expressing the adhesive and/or
sealant contained in the cartridge and an outlet orifice being provided at the
opposite end for discharge of the adhesive and/or sealant. The piston is
displaced by application of a force inside the cartridge, such that the
adhesive
and/or sealant may be discharged. It goes without saying that similar suitable
containers known to a person skilled in the art are also used, in particular
known tubular bags. In the case of the latter tubular bags, the use of a known
adapter is suitable for fitting the nozzle according to the invention, such
that the
means for detachable fastening of the nozzle are not engaged with the tubular
bag, but rather with the adapter.
[0009] Dispensing guns suitable for use, such as for example tubular bag
and/or cartridge guns, are in particular pneumatic guns, in which the adhesive
and/or sealant may be discharged from the cartridge via the nozzle by means a
pneumatic system. These guns are particularly suitable for use with a repair
nozzle according to the invention, since in most auto shops compressed air is
available, so making power-saving discharge of the adhesive and/or sealant
possible for the user. Particularly suitable for use is a special compressed
air
gun for ejecting pasty to low-viscosity material, as described in
international
patent application PCT/EP2006/004600. As far as the aspects relating to the
cartridge gun are concerned, reference may be made to the stated citation, the
disclosure content of which in this respect supplements the disclosure of the
present patent application. It is also feasible to use purely mechanically
acting
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cartridge guns known to a person skilled in the art. These are suitable for
example for use in areas where no compressed air is available. However, use of
pneumatically acting cartridge guns is preferred, since in particular in the
automotive sector highly pasty adhesives and/or sealants are often applied,
such that the use of special pneumatic cartridge guns which are capable of
generating higher expression pressures than purely mechanically acting guns
is particularly suitable.
[0010] The repair nozzle is preferably made of plastics. Preferably, the
repair
nozzle is a disposable product. After discharge of the adhesive and/or sealant
the nozzle is thus disposed of. Cleaning of the nozzle is not provided in this
case, such that working time may be avoided and it is possible to do without
further auxiliary or cleaning substances for removing adhesive and/or sealant
residues. The means for detachably fastening the nozzle to the cartridge are
preferably provided at the proximal product feed end. It may in particular be
a
threaded region, which may be brought into engagement with a corresponding
threaded region of the cartridge in order to fasten the nozzle to the
cartridge. In
addition, a projecting collar is preferably provided in the region of the
proximal
product feed end for supporting the repair nozzle on the cartridge gun. To use
the repair nozzle, the latter is preferably connected to a cartridge via said
connecting means and inserted into the cartridge gun together with the
cartridge. In this case, the repair nozzle preferably projects out of an
orifice in
the cartridge gun at least with its distal end. The orifice is dimensioned
such
that the collar of the repair nozzle may rest at the proximal end on the parts
of
the cartridge gun defining the orifice. The orifice is thus preferably smaller
than
the collar of the repair nozzle. When, in order to discharge the adhesive
and/or
sealant out of the cartridge, the latter is exposed to pressure via the
cartridge
gun, the cartridge with the repair nozzle is pressed in the direction of the
distal
product discharge end of the repair nozzle. As a result of the projecting
collar of
the repair nozzle, the repair nozzle comes to rest against the cartridge gun,
such that displacement of the cartridge with the nozzle is prevented and the
adhesive and/or sealant may be discharged via the repair nozzle.
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[0011] The repair nozzle comprises a slot-shaped mbuth orifice at the distal
product discharge end, for discharging an adhesive and/or sealant bead. This
slot-shaped mouth orifice has proven particularly advantageous for applying
wide beads, the substrate being wetted over a wide area with said adhesive
and/or sealant, such that an excellent adhesive and/or sealing effect may be
achieved. Preferably, the adhesives and/or sealants are not applied with the
repair nozzle to regions with large gap dimensions, such that the use of a
slot-
shaped mouth orifice is particularly suitable. The beads applied in the
automotive sector using the repair nozzle according to the invention serve to
adhesively bond sheet metal parts or insulation against noise or temperature,
to absorb sound or vibrations or are used for sealing.
[0012] Use of a repair nozzle according to the invention brings many
advantages. In particular, structures which have been produced automatically
in the context of mass production in the automotive sector may be restored or
recreated by auto shops for example in the case of repair in the after market
and in particular in the repair market. Accident damage to such structures may
in particular be repaired in this way. The use of an application robot, which
is
necessary in mass production for applying the adhesives and/or sealants to
produce the structures, may be dispensed with. By using a repair nozzle
according to the invention, the adhesives and/or sealants used as standard in
the automotive sector and applied automatically in mass production may be
applied subsequently in particular in the after market, such as for example in
auto shops, in particular in the case of repair. The slot-shaped mouth orifice
of
the repair nozzle has further advantages. The slot-shaped design allows a
specific adhesive and/or sealant bead to be discharged. The bead is relatively
wide in relation to its height on account of the slot-shaped mouth orifice.
The
bead is a cleanly dimensioned rippled flat bead, i.e. the width and/or height
and/or visual appearance of the bead correspond to the design of the adhesive
and/or sealant bead as originally produced, which has hitherto been achieved
solely by robot application. In the process, with the adhesive and/or sealant
bead discharged by way of the repair nozzle there is additionally no
overspray.
The applicant thus obtains an adhesive and/or sealant bead with sharp,
unfrayed edges. In addition, the slot-shaped mouth orifice may be used to
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provide an adhesive and/or sealing area which exhibits a continuous film and
thus provides an improved adhesive bond or seal.
[0013] A further advantage of using a repair nozzle is that said nozzle is
provided with a product channel for conveying the adhesive and/or sealant from
the product feed end to the product discharge end and with an end cap formed
on the product discharge end and comprising the slot-shaped mouth orifice,
which end cap is curved in the distal direction of the nozzle. This shape has
proven particularly advantageous. The product channel preferably tapers from
the proximal product feed end towards the distal product discharge end, to
increase the flow velocity of the adhesive and/or sealant within the product
channel. A slight taper is also suitable for compensating the pressure drop
experienced by the adhesive and/or sealant due to friction against the
internal
walls of the product channel. Providing the repair nozzle with an end cap
curved in the direction of the distal product discharge end allows
particularly
simple manufacture of the repair nozzle. In particular, demolding of repair
nozzles made from plastics using the injection molding process is simplified
significantly by a curved end cap. In addition, a repair nozzle with a curved
end
cap exhibits excellent flow characteristics, such that the pressure drop
experienced by the adhesive and/or sealant in the repair nozzle may be
reduced. This nozzle shape is suitable particularly for applications in which
no
size adaptation of the sealant and/or adhesive bead has to be made. For
example, a special repair nozzle is used, wherein the repair nozzle may be
provided with a slot-shaped mouth orifice prefabricated for the adhesive
and/or
sealant to be discharged and/or for a particular instance of use. By using
such
a repair nozzle, the user may be provided in every case with the correct mouth
orifice for the adhesive and/or sealant to be discharged and/or the instance
of
use, such that errors may be avoided.
[0014]A further advantage of using a curved end cap at the distal product
discharge end is provision of the slot-shaped mouth orifice over a summit of
curvature of the curved end cap. The summit of curvature should here be
understood to mean the point of the curved end cap at which the end cap
projects furthest in the distal direction of the repair nozzle. Extension of
the slot-
CA 02736717 2011-03-10
shaped mouth orifice over the summit of curvature is particularly advantageous
from the point of view of flow. When the adhesive and/or sealant is
discharged,
due to the curvature of the slot-shaped mouth orifice it is also discharged
sideways in places, such that the user obtains a product bead which is wider
than purely the diameter of the repair nozzle in the region of the distal
product
discharge end without the curved end cap.
[0015] As an alternative to providing the repair nozzle with a curved end cap,
the repair nozzle may also be provided with a product channel for conveying
the adhesive and/or sealant from the product feed end to the product discharge
end and with an end region formed on the product channel and comprising the
slot-shaped mouth orifice, which end region extends trapezoidally in the
distal
direction, the base of the trapezoidal end region being arranged at the distal
product discharge end. Here too the product channel preferably tapers from the
proximal product feed end in the direction of the distal product discharge
end,
in order to increase the flow velocity of the adhesive and/or sealant inside
the
product channel and/or to compensate the pressure drop experienced by the
adhesive and/or sealant due to friction against the internal walls of the
product
channel. Preferably the trapezoidal end region is hollow at the distal product
discharge end, such that the base of the trapezoidal end region forms the slot-
shaped mouth orifice at the distal product discharge end. It goes without
saying
that the slot-shaped mouth orifice may also be formed by only parts of the
base. With an end region of this configuration, repair nozzles may be produced
with particularly wide slot-shaped mouth orifices, for discharging very wide
adhesive and/or sealant beads. The trapezoidal design of the end region has
further advantages. It is feasible for the trapezoidal end region to be cut to
size
by the user, by cutting off parts of the end region in such a way that the
trapezoidal end region no longer extends so far in the distal direction. Due
to
the trapezoidal design of the end region, cutting off a distal region of the
end
region is associated with a reduction in the size of the base of the end
region.
In the case of an above-described hollow end region, the above-described
cutting to size would result in a reduction in the size of the slot-shaped
mouth
orifice which then extends over the base, which is new once the end region has
been cut to size. The user is thus provided with a repair nozzle, wherein the
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slot-shaped orifice may be adapted to the product bead of adhesive and/or
sealant to be discharged by cutting the end region to size. To this end, marks
and/or inscriptions and/or preferred cutting lines for assisting with cutting
off
may be provided on the repair nozzle and in particular on the end region, at
which cutting lines parts of the end region may be cut off by the user to
obtain
specific slot-shaped nozzle orifices. For the automotive sector in particular,
a
trapezoidal design of the end region has proven particularly advantageous,
wherein the end region may be cut to size in such a way that a width of
between 1cm and 12cm may be established for the slot-shaped mouth orifice.
With such a region a multipurpose repair nozzle may be provided, which covers
the most common bead widths in particular in the automotive sector and with
which common structures may be restored and/or recreated.
[0016] A further advantage of providing the nozzle with a product channel is
the
rotationally symmetrical configuration, at least in places, of the product
channel,
wherein the axis of rotation extends from the proximal product feed end to the
distal product discharge end.
[0017] A further advantage of the rotationally symmetrical configuration, at
least
in places, of the product channel is the provision of a slot-shaped mouth
orifice
which extends over the axis of rotation of the product channel.
[0018] A further advantage is the provision of a repair system for restoring
structures in the automotive sector, consisting of a repair nozzle, a
cartridge
gun and a cartridge containing adhesives and/or sealants, the repair nozzle
comprising a proximal product feed end and a distal product discharge end,
wherein at the proximal product feed end means are provided for fitting to the
cartridge containing an adhesive and/or sealant and a projecting collar is
provided for resting on the cartridge gun and/or on the cartridge itself for
discharging the adhesive and/or sealant from the cartridge and wherein a slot-
shaped mouth orifice is provided at the distal product discharge end, for
dispensing an adhesive and/or sealant bead for restoring and/or reproducing
structures in the automotive sector. With such a system the user may recreate
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and/or restore automatically mass-produced structures without haying to make
use for example of an application robot.
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[0019] List of reference numerals:
Repair nozzle
11 Product feed end
12 Product discharge end
13 Mouth orifice
14 Product channel
Axis of rotation
16 Collar
17 End cap
Repair nozzle
21 Product feed end
22 Product discharge end
23 Mouth orifice
24 Product channel
Axis of rotation
26 Collar
27 Trapezoidal end region
28 Base
29 Cutting lines
100 Cartridge gun
101 Handle
102 Metering means
103 Receiving unit
104 Mount region
105 Actuating lever
106 Grip region
107 Compressed air connection
108 Pressure regulator
109 Manometer
110 Delivery end
111 Closing cap
112 Orifice
113 Cartridge
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114 External thread
115 Adhesive and/or sealant
= CA 02736717 2011-03-10
[0020] The invention is explained in greater detail below by way of example
with reference to the drawings, in which
Figure 1 shows a perspective view of a repair nozzle according to the
invention
with a curved end region
Figure 2 shows a perspective view of an alternative embodiment of a repair
nozzle according to the invention with a trapezoidal end region
Figure 3 shows a partially sectional side view of a repair system with a
cartridge gun, a cartridge and the repair nozzle from Figure 2.
[0021] Figure 1 shows a repair nozzle 10 according to the invention, which is
used to discharge adhesives and/or sealants usable in the automotive sector
from a cartridge, not shown, containing them by means of an associated
cartridge gun, not shown. The repair nozzle 10 comprises a proximal product
feed end 11, with which the repair nozzle 10 may be fastened detachably to a
cartridge, and a distal product discharge end 12 for discharging the adhesive
and/or sealant onto a substrate. At the proximal product feed end 11 a product
channel 14 is provided which is substantially rotationally symmetrical about
an
axis of rotation 15 at least in places. The product channel 14 constitutes a
connection for the adhesive and/or sealant between the proximal product feed
end 11 and the distal product discharge end 12. The product channel 14
comprises an internal thread, not shown, such that the repair nozzle 10 may be
fitted on a cartridge with a corresponding external thread. To discharge the
adhesive and/or sealant, an end cap 17 is provided at the distal product
discharge end 12, which end cap comprises a slot-shaped mouth orifice 13 for
discharging the adhesive and/or sealant. The end cap 17 is curved in the
distal
direction of the repair nozzle 10 and the slot-shaped mouth orifice 13 extends
over the summit of curvature of the curved end cap 17. In the present
exemplary embodiment the axis of rotation 15 additionally extends through the
slot-shaped mouth orifice 13. With the slot-shaped mouth orifice 13 beads of
adhesive and/or sealant may be discharged which have a small application
height on the substrate compared with the application width. This has major
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advantages in particular for the adhesive bonding of components in the
automotive sector, since the biggest possible area of the substrate should be
provided with adhesive and/or sealant in order to achieve a sufficient
adhesive
and/or sealing effect, wherein the thickness of the adhesive and/or sealant
layer should be kept as small as possible. By using the curved end cap 17 and
as a result of the profile of the slot-shaped mouth orifice 13 over the summit
of
curvature of the end cap 17, it is additionally possible to ensure discharge
of a
relatively wide bead, since the adhesive and/or sealant can be discharged at
the end regions of the slot-shaped mouth orifice 13 not only in the axial
direction relative to the axis of rotation 15, but also in part radially
outwards
relative to the axis of rotation 15. Furthermore, at the proximal product feed
end
11 a collar 16 is provided which projects radially outwards relative to the
axis of
rotation 15 and serves to support the repair nozzle 10 against a cartridge gun
and/or against the cartridge itself.
[0022] Figure 2 shows an alternative embodiment of a repair nozzle 20 with a
proximal product feed end 21 and a distal product discharge end 22. At the
product discharge end 22 the repair nozzle 20 comprises a product channel 24
which is rotationally symmetrical about an axis of rotation 25. A trapezoidal
end
region 27 adjoins the product channel 24 in the direction of the distal
product
discharge end 22, which trapezoidal end region comprises a slot-shaped mouth
orifice 23. The trapezoidal end region 27 is configured such that a base 28 is
arranged at the distal product discharge end 22. The slot-shaped mouth orifice
23 extends over the base 28 of the trapezoidal end region. Furthermore, at the
proximal product feed end 21 a collar 26 is provided which projects radially
outwards relative to the axis of rotation 25 and serves to support the repair
nozzle 20 against a cartridge gun. The trapezoidal end region 27 comprises a
plurality of cutting lines 29 arranged on the surface parallel to the base 28.
These cutting lines 29 constitute marks at which the user may cut off parts of
the trapezoidal end region 27. Because of the trapezoidal shape of the end
region 27, cutting off a part at the distal product discharge end 22 is
associated
with a reduction in size of the base 28. Accordingly, cutting off a part of
the
trapezoidal end region 27 results, by reducing the size of the base 28, also
in a
reduction in size of the slot-shaped mouth orifice 23 which extends over the
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base 28. In this way, by cutting off parts of the trapezoidal end region 27
the
user may vary the size of the slot-shaped mouth orifice 23 to adjust it to the
adhesive and/or sealant to be discharged or the size of the desired bead.
[0023] The repair system shown in Figure 3 for recreating and/or restoring
structures in the automotive sector consists of the trapezoidal repair nozzle
20
shown in Figure 2, a cartridge gun 100 and a cartridge 113 containing an
adhesive and/or sealant 115. It goes without saying that another repair nozzle
20 may also be used, for example a repair nozzle shown in Figure 1 with an
end cap formed on the product discharge end and comprising the slot-shaped
mouth orifice, which end cap is curved in the distal direction of the nozzle.
[0024] The cartridge gun 100 comprises a handle 101, which makes it possible
for the user to operate and guide the cartridge gun 100. To this end the
handle
101 includes a grip region 106, which may be provided with non-slip means or
have an ergonomic shape, to provide the user with a reliable hold when
working with the system. The handle 101 is provided with a mount region 104
at which a receiving unit 103 is joined to the handle 101. The receiving unit
103
has a hollow cylindrical shape and serves to receive the cartridge 113 filled
with
the adhesive and/or sealant 115 to be discharged. Product is discharged at a
delivery end 110 of the receiving unit 103. To this end a metering device 102
is
provided on the handle 101, by means of which the user can regulate
discharge of the adhesive and/or sealant 115 contained in the cartridge 113.
In
the present exemplary embodiment the cartridge gun 100 is pneumatically
acting, wherein discharge of the adhesive and/or sealant 115 is made possible
by the use of compressed air. To this end a compressed air port 107 is
provided on the handle 101. The user may connect a pressure medium, for
example a compressor, to this compressed air port 107. The pressure is
regulated by a pressure regulator 108 fixed to the handle 101. Using a
manometer 109 provided on the handle 101 the user may read off the pressure
applied to the cartridge gun 100 and adjusted via the pressure regulator 108.
To regulate the pressure for discharge of the adhesive and/or sealant 115 the
metering unit 102 may be operated by means of an actuating lever 105, which
is mounted on the handle 101 and may be pivoted towards the handle 101.
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Discharge of the adhesive and/or sealant 115 located in the cartridge 113 may
be regulated by way of the degree of pivoting of the actuating lever 105 and
the
air pressure established at the pressure regulator 108. In the receiving unit
103
a propelling element, not shown, is provided for discharging the adhesive
and/or sealant 115, which propelling element may be displaced inside the
receiving unit 103. By applying pressure to the propelling element, the latter
is
displaced and forces the cartridge 113 arranged in the receiving unit 103,
with
the adhesive and/or sealant 115 to be discharged, towards the delivery end
110 of the receiving unit 103. The receiving unit 103 comprises a closing cap
111 at the delivery end 110. In the present exemplary embodiment this closing
cap 111 is connected via a screw thread to the cylindrical receiving unit 103
and comprises an orifice 112 aligned concentrically with the hollow-
cylindrical
shape of the receiving unit 103. Via this orifice 112 the adhesive and/or
sealant
115 may be discharged from the cartridge 113 located in the receiving unit
103.
In addition, in the present exemplary embodiment the orifice 112 in a system
in
which a trapezoidal repair nozzle 20 is used is configured such that it
comprises slots extending radially outwards relative to the closing cap 111,
which slots are dimensioned such that, where a trapezoidal repair nozzle 20 is
fitted, the closing cap 111 may be pushed over the trapezoidal end region 27
of
the repair nozzle 20 for fitting to the receiving unit 103.
[0025] To prepare the system to start work, the repair nozzle 20 is connected
to
the cartridge 113. To this end the cartridge 113 comprises an external thread
114, which may be brought into engagement with a corresponding internal
thread on the product channel 24 of the repair nozzle 20. To start working
with
the system, the cartridge 113 is introduced into the cavity in the receiving
unit
113 in such a way that the repair nozzle 20 projects out of the receiving unit
103. The closing cap 111 is then pushed over the trapezoidal end region 27 of
the repair nozzle 20 and connected to the receiving unit 103 by way of the
above-described screw fastening. When fitted the repair nozzle 20 projects
with
the product channel 24 through the orifice 111 out of the receiving unit 113.
By
applying pressure to the propelling element, not shown, for discharging the
adhesive and/or sealant 115, the cartridge 113 is forced towards the delivery
end 110 and rests against the closing cap 111. To ensure secure retention of
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the repair nozzle 20, it is provided with the collar 26. Said collar is larger
than
the orifice 112 in the closing cap 111, such that in the event of movement of
the
cartridge 113 resulting from the pressure introduced and thus also of the
repair
nozzle 20 it may also be ensured that the repair nozzle 20 rests against the
closing cap 111. Due to said resting arrangement, the pressure applied does
not move the cartridge 113 together with the repair nozzle 20, but rather
moves
the propelling element inside the cartridge 113, such that the adhesive and/or
sealant 115 is pressed out of the cartridge 113, enters the product channel 24
of the repair nozzle 20 and may finally be discharged via the slot-shaped
mouth
orifice 23. To adjust the desired bead width for adhesive and/or sealant 115,
the user may remove regions of the repair nozzle 20 predetermined by means
of the cutting lines 29 on the trapezoidal end region 27 and corresponding to
the structure to be recreated and/or to the adhesive and/or sealant 115, such
that, due to the trapezoidal design of the end region 27, the mouth orifice 23
becomes smaller the more the user removes from the trapezoidal end region
27. With the present system very wide beads of adhesive and/or sealant 115
may be discharged due to the use of a repair nozzle 20 with a slot-shaped
mouth orifice 23, wherein the bead height may be kept as small as possible.
Beads applied in this way with as large as possible a wetting area of the
substrate allow excellent adhesive bonding and/or sealing and enable
restoration and/or recreation of automatically produced structures in the
automotive sector.
