[0001] The invention relates to a sealing blade, which includes opposite elongated edges
and between them a flat and which is adaptable to a blade holder arranged in a coating
applicator of a coating device and into contact with a moving surface.
[0002] The coating or surface sizing of paper or board may be performed for example using
a film transfer coater. In it, the web to the treated runs through a nip located between
two rolls. The coating mixture or sizing agent is spread using a specific coating
applicator onto the surface of one roll or both rolls, from which surface it is transferred
onto the surface of the web to be treated in the nip between the rolls. The thickness
and profile of the sizing agent layer on the surface of the roll may be adjusted for
example by means of a doctor blade or a rotating metering rod.
[0003] The coating applicator may comprise an application chamber, which is limited in the
direction of rotation of the roll by the doctor element and on the other hand by the
front wall. In the lateral direction, the application chamber is limited by the side
seals. The coating mixture or surface sizing agent is fed into the application chamber
for example through a channel located in the girder of the coating applicator. The
coating mixture is fed into the application chamber at such a great speed and pressure
that a return flow is created in the gap between the front wall and the application
roll, in other words a coating mixture flow or sizing agent flow in a direction opposite
to the direction of rotation of the application roll is created. The purpose of the
return flow is to prevent the penetration of air, which is on the surface of the application
roll, into the application chamber. If air can enter the application chamber, places
with no coating may be created in the web.
[0004] It is well known that a sealing blade may be used as the front wall that closes the
application chamber. The sealing blade may be pressed against the application roll
so that no air escapes from between the blade and the application roll into the application
chamber. There is no actual return flow from between the sealing blade and the application
roll, but some coating mixture is led from the application chamber to the front of
the blade through flow openings in the sealing blade. In this case, a pool of lubricant
is formed in front of the sealing blade, which pool of lubricant prevents the friction
occurring between the sealing blade and the application roll from damaging the roll
or the sealing blade. If the pressure of the application chamber rises for example
as a result of an excessive feeding of coating mixture, the force that presses the
sealing blade against the application roll increases, whereby the sealing blade wears
more rapidly and may damage the application roll or at least wear it.
[0005] However, a drawback related to the prior art sealing blade is that the edge of the
blade placed against the application roll becomes sharp in connection with the use
of the blade. This causes occupational safety problems in the maintenance of the coating
applicator. A sharpened sealing blade is dangerous to the maintenance personnel for
example when the sealing blade, metering rod or the cradle of the metering rod is
replaced. For the replacement of just the metering rod and its cradle, which replacement
needs to be performed in some cases more frequently than the replacement of the sealing
blade, it is not often customary to remove the sealing blade from the coating applicator,
because this is troublesome to perform. What makes the removal of the sealing blade
difficult is that it may be firmly stuck to its blade holder and would therefore require
washing to facilitate the removal. A sealing blade which has become sharpened and
which is also difficult to remove may cause incised wounds to employees and also damage
to the surface of the application roll.
[0006] Attempts in many different ways have been made to solve the problem related to the
sealing blade becoming sharpened, but with little success. Since the holder of the
sealing blade is fastened to the girder in a stationary manner, it is difficult to
change the position of the holder. The sealing blade may also be lifted higher in
the blade holder, but this does not always give the desired outcome, either. An attempt
to enhance the lubrication that decreases the friction between the sealing blade and
the application roll may be made by changing the feed pressure, but this is restricted
by the seals that do not seal sufficiently well and by fouling problems. Moreover,
it is not desirable to shift to a thinner sealing blade and a higher chamber pressure
because of reasons such as increased leaks and splashes.
[0007] One prior art sealing blade that can be mentioned is in
FI patent number 103058. The sealing blade known from it is a planar item. Both flat surfaces of the blade
are hence essentially similar planar surfaces, in other words the front edge and the
back edge of the blade are in the same plane. A sealing blade according to the preamble
of claim 1 is known from
US 5, 902, 401 A. Document
US 2009/0170390 teaches a doctor blade for applying resin to a thin cloth. Depending upon the purpose
of the resin finishing, the tip of the blade may be bent backward at an angle of 50-150
degrees to the lower portion of the blade.
[0008] The purpose of the present invention is to accomplish a sealing blade where the edge
becomes less sharpened. The characteristics of the sealing blade according to the
invention are presented in claim 1.
[0009] In the invention, a contact surface, which may be arranged against a moving surface
and which is 5 - 15% of the width of the sealing blade, is adapted in the sealing
blade. As a result of the contact surface already adapted in the sealing blade in
advance, the angle between the sealing blade and the moving surface decreases, the
area of contact of the sealing blade with the moving surface increases, and the wear
of the sealing blade decreases. In this way, also the flat surface of the sealing
blade can be brought reliably into contact with the moving surface, the sharpening
of the elongated edge of the sealing blade is reduced, and occupational safety related
to the maintenance of the coating device is enhanced.
[0010] According to one embodiment, flow openings may be included in the flat of the sealing
blade. In this case, most of the contact surface is adapted between the elongated
edge and the flow openings. This ensures the optimum functioning of the flow openings
in all circumstances, and they do not settle against the moving surface.
[0011] The flat of the sealing blade is divided into two or more areas, and the contact
surface is formed in at least one area. The division is accomplished by means of one
or more folds. Several other advantages are also accomplished with the invention,
such as longer service life of sealing blades, longer replacement interval of rolls,
smaller quality variation of paper and board and higher production volume of paper
and board, when sealing blades do not need to be replaced prematurely. The other additional
advantages to be achieved with the invention are disclosed in the description of the
invention, and the characteristics are disclosed in the claims.
[0012] The invention, which is not restricted to the embodiments presented below, is described
in more detail by making reference to the enclosed drawings, in which:
- Figure 1
- shows an example in principle of a coating device disclosed but not claimed viewed
from the side,
- Figure 2
- shows one example of a coating applicator disclosed but not claimed seen from the
side,
- Figure 3
- shows one example of a sealing blade disclosed but not claimed viewed axially from
the top, from one end of the sealing blade, and
- Figures 4a - 4c
- show on a rough level of principle various embodiments of which only the embodiment
in fig. 4c is claimed of the sealing blade and of how it settles against the application
roll, viewed from the side.
[0013] Figure 1 shows an example in principle of a coating device 21 viewed from the side.
In this case, the device 21 comprises two rotating application rolls 22, 11, which
are adapted in a nip contact and between which the paper or board web 24 to be treated,
in other words to be surface sized or coated, is adapted to travel. The direction
of travel of the web 24 is indicated by an arrow, and the direction of travel of the
rolls 22, 11 is also indicated by an arrow. A web 24 treatment substance, such as
a coating mixture or surface sizing agent, is spread onto the surfaces 22', 11' of
the application rolls 22, 11 by means of coating applicators 25. The treatment substance
layer is levelled and its thickness is adjusted by means of a doctor element such
as a doctor blade or a rotating metering rod (reference number 15 in Figure 2). The
doctored treatment substance layer is transferred from the application rolls 22, 11
onto both sides of the web 24 to be treated in a nip between the rolls 22, 11. If
only one side of the web 24 is treated, the treatment substance is only spread onto
one application roll 11.
[0014] Figure 2 shows one example of a disclosed but not claimed coating applicator 25 seen
from the side. In this case, the coating applicator 25 is constructed to rest on the
girder 12, and the application chamber 20 that is against the application roll 11
is formed by a space in the girder 12, which space is limited in the direction of
rotation of the application roll 11 by a sealing blade 10 which comes first, i.e.
on the inlet side, and by a metering rod 15 which is on the outlet side, i.e. latter
in the direction of rotation. The sealing blade 10 is fastened to the girder 12 by
means of a blade holder 17, and the metering rod 15 is fastened by means of a rod
holder 14.
[0015] The sealing blade 10 presses against the surface 11' of the application roll 11 and
prevents the coating from flowing in an uncontrolled manner against the direction
of rotation of the roll 11 and the access of air, which is carried with the rotating
roll 11, into the application chamber 20. A metering rod 15 is placed at a distance
from the sealing blade 10, which metering rod 15 is pressed against the application
roll 11, but which metering rod 15 is suspended hydrodynamically at a distance from
the surface 11' of the roll 11 by a film transferred onto the rotating roll 11. The
thickness of the film transferred onto the surface 11' of the roll 11 is adjusted
by changing the loading of the metering rod 15. The distance between the sealing blade
10 and the metering rod 15 forms an application distance, and the application chamber
20 is hence limited by the girder 12, sealing blade 10, metering rod 15 and application
roll 11. The ends of the application chamber 20 are sealed in the case according to
the embodiment by means of flexible seals 19, which limit the width of the area to
be coated. The coating is fed into the application chamber 20 through nozzles 18 from
a main tube 13 located inside the girder 12 and extending over the entire width of
the coating applicator 25.
[0016] Figure 3 presents one disclosed but not claimed example of a sealing blade 10 viewed
axially from the top, from its one end, which sealing blade 10 may be corresponding
to the one installed in the coating applicator 25 in Figure 2. The sealing blade 10
includes opposite elongated edges 30, 31 and a flat 32 between them. The flat 32 has
two opposite sides, forming the flat surfaces 32a and 32b. The flat surface 32a of
the flat 32 on the side of the roll 11 and the flat surface 32b on the side of the
application chamber 20. Of these flat surfaces, Figure 3 shows the flat surface 32b
on the side of the application chamber 20.
[0017] The sealing blade 10 is adaptable, so that it may be replaced, to a blade holder
17 arranged in a coating applicator 25 of a coating device 21 and into contact with
the moving surface 11' . For these, the sealing blade 10 includes a fastening area
37 adapted on the side of the first elongated edge, the back edge 31, from which fastening
area 37 the sealing blade 10 is adapted to be fastened to the blade holder 17. In
the fastening area 37, there may be for example die-cut fasteners, which ensure the
fastening of the blade 10 to the holder 17. The second elongated edge, the front edge
30, which is opposite to this first edge 31 coming to the elongated holder 17, includes
a tip 38, which is adaptable against the moving surface 11'.
[0018] A contact surface 33, which may be arranged against the moving surface 11', is adapted
in the sealing blade 10. Some examples of the contact surface 33 are presented in
Figures 2 and 4a - 4c. The contact surface 33 is on the flat surface 32a of the sealing
blade 10 on the side of the roll 11, in other words on a side different from the side
of the application chamber 20. The contact surface 33 may be 5 - 15% of the width
W of the sealing blade 10. In this connection, the width W of the sealing blade refers
to the distance between the elongated edges 30, 31 of the sealing blade 10, measured
along the flat 32. Correspondingly, the length L of the sealing blade 10 refers to
the length of the sealing blade 10 in the cross direction of the machine. The length
L of the sealing blade 10 may be several meters, as much as ten meters. The directions
W and L are perpendicular to each other. It must be noted that in the figures the
proportions of the sealing blade 10 and its parts are not necessarily actual proportions.
As a result of the contact surface 33 arranged in the sealing blade 10 as early as
during its manufacture, the sealing blade 10 is, when installed in the blade holder
17, at a suitable angle with respect to the roll 11, and hence for example the lubrication
of the tip 38 of the sealing blade 10 becomes sufficient and the tip 38 becomes less
sharpened even otherwise, because part of the flat surface 32a is against the moving
surface 11'.
[0019] By arranging the contact surface 33 in the sealing blade 10, it can be brought into
contact with the moving surface 11' more reliably over a larger area and especially
over its flat 32 than merely by a connection over its elongated edge 30. Moreover,
the contact surface 33 is in the sealing blade 10 already before it is installed in
the blade holder 17, and it is not formed only when loading the blade 10 against the
moving surface 11'. In other words, it can be said that initial tension has been removed
from the blade 10 when it is installed in its blade holder 17. This makes the contact
between the flat 32 of the blade 10 and the moving surface 11' very reliable, and
at the same time the sharpening of the tip 38 of the blade 10 is reduced.
[0020] According to one disclosed but not claimed embodiment, flow openings 34, 34.1 - 34.3
may be adapted in the flat 32 of the sealing blade 10. Some examples of their locations
have been presented in Figures 4a - 4c, where the openings are described in principle
by the two-headed arrows running through the flat 32 of the blade 10. Most of the
contact surface 33 may be adapted between the elongated edge 30 and the flow openings
34, 34.1 - 34.3 of the blade 10. The contact surface 33 and the flow openings 34,
34.1 - 34.3 are adapted in the sealing blade 10 so that when in contact with the moving
surface 11', the flow openings 34, 34.1 - 34.3 adapted in the sealing blade 10 are
at least partially separated from the moving surface 11'. In this case, the moving
surface 11' does not block the flow openings 34, 34.1 - 34.3. This also ensures the
functioning of the flow openings 34, 34.1 - 34.3 in all circumstances, in other words
the access of air into the chamber 20 is prevented, the lubrication of the sealing
blade 10 is ensured and the removal of overpressure from the chamber 20 is ensured.
As a result of the invention, it is even possible to improve the impacts achieved
with the flow opening 34, 34.1 - 34.3. The location of the flow openings 34, 34.1
- 34.3 on the flat 32 of the blade 10 may be optimized for example close to a standardized
contact surface 33 and hence the lubrication between for example the blade 10 and
the moving surface 11' may be intensified.
[0021] According to one disclosed but not claimed embodiment, the contact surface 33 may
be arranged in the sealing blade 10 for example so that the flat 32 of the sealing
blade 10 is divided into two or more areas 35.1 - 35.3, of which the contact surface
33 is formed in at least one area 35.1, in other words on one side of the flat 32.
In Figures 4a and 4b, the sealing blade 10 has been divided into two areas 35.1, 35.3,
and the contact surface 33 is in the area 35.1. In Figure 4a, the contact surface
33 is in a planar area 35.1, and in Figure 4b the contact surface 33 is in a curved
area 35.1. Correspondingly according to the invention, in Figure 4c the sealing blade
10 has been divided into three areas 35.1 - 35.3, and the contact surface 33 is again
in the area 35.1, which is a planar area here, too.
[0022] According to the embodiments presented in Figures 4a - 4c, the areas 35.1 - 35.3
may be formed in several different ways. According to a first disclosed but not claimed
embodiment, the flat 32 of the sealing blade 10 is divided into two or more areas
35.1 - 35.3 by means of one or more folds 36.1, 36.2. In Figures 4a and 4b, the sealing
blade 10 has one fold 36.1, and in the embodiment according to the invention in Figure
4c, the sealing blade 10 has two folds 36.1, 36.2. The fold 36.1, 36.2 may be a bevelled
sharp fold or also a rounded fold. With two folds 36.1, 36.2, the angles of the folds
do not need to be that great. The flat 32 of the sealing blade 10 may also be divided
into two or more areas 35.1, 35.3 by means of one or more roundings 36.3. This is
the case for example in Figure 4b. The folds 36.1, 36.2 and/or roundings 36.3, more
generally the removal of the initial tension of the sealing blade 10, may be performed
for example in the last stage of the manufacture of the sealing blade 10.
[0023] Figures 4a present three different possibilities to arrange the flow openings 34.1
- 34.3 in the sealing blade 10. They can be for example in the same area 35.1 with
the contact surface 33, in which case they are between the fold 36.1 and the contact
surface 33. They can also be in the same area 35.3 where the sealing blade 10 is fastened
to the holder 17. Moreover, they can also be at exactly the fold 36.1. In the embodiment
of Figure 4b, the flow openings 34.3 are in the area 35.3, and in Figure 4c the flow
openings 34.1 are in the area 35.2.
[0024] The distance D of the top edge of the flow openings 34, in other words that of the
edge closest to the tip 38 of the blade 10, from the elongated edge 30 of the sealing
blade 10, which edge 30 is equipped with the tip 38, may be for example 15 - 50 mm.
The sealing blade 10 may be for example of spring steel type 1,4301, and its material
thickness may be for example 0.254 - 0.381 mm and total width W for example 100 -
130 mm.
[0025] As presented above, the sealing blade 10 according to the invention is no longer
a planar item known from prior art. Instead, its front edge 30 is deviated from the
planar surface. The deviation is accomplished by means of two or more angle folds
in the longitudinal L direction of the blade 10. The folds may be located in the width
W direction of the blade 10 at a distance of 5 - 15% from the tip 38 of the blade
10, which tip 38 is an edge 30 opposite to the edge 31 on the side of the blade holder
17. Another alternative disclosed but not claimed presented for example in Figure
4b is to round the tip portion of the blade 10 in the area 33 in question to be curved
in the same direction as the curvature of the roll surface 11'.
[0026] It is to be understood that the above description and the related figures are only
intended to illustrate the present invention. The invention is hence not only restricted
to the above-presented embodiments or the embodiments defined in the claims, but several
different variations and adaptations of the invention will also be obvious to a professional
in the field, which variations and adaptations are possible within the inventive idea
defined by the enclosed claims.
1. A sealing blade, which includes opposite elongated edges (30, 31) and between them
a flat (32) and which is adaptable to a blade holder (17) arranged in a coating applicator
(25) of a coating device (21) and into contact with a moving surface (11'), wherein
a contact surface (33), which may be arranged against the moving surface (11') and
which is 5 - 15% of the width (W) of the sealing blade (10), is adapted in the sealing
blade (10), and wherein the sealing blade (10) includes:
- a fastening area (37) adapted on the side of a first elongated edge (31), from which
fastening area (37) the sealing blade (10) is adapted to be fastened to said blade
holder (17),
- a second elongated edge (30), which is opposite to the first elongated edge (31),
- flat surfaces (32a, 32b) located on the opposite sides of the sealing blade (10)
between the elongated edges (30, 31), to which flat surface said contact surface (33)
is adapted on one side,
characterized in that the flat (32) of the sealing blade (10) is divided into more than two areas (35.1
- 35.3), from which the contact surface (33) is formed in at least one area (35.1),
and the flat (32) of the sealing blade (10) is divided into the more than two areas
(35.1 - 35.3) by means of more than one folds (36.1, 36.2) .
2. A sealing blade according to claim 1, where flow openings (34, 34.1 - 34.3) are adapted
on the flat (32) of the sealing blade, characterized in that most of the contact surface (33) is adapted between the elongated edge (30) and the
flow openings (34, 34.1 - 34.3).
3. A sealing blade according to claim 1 or 2, where flow openings (34, 34.1 - 34.3) are
adapted on the flat (32) of the sealing blade, characterized in that the contact surface (33) is adapted in the sealing blade (10) so that when in contact
with the moving surface (11'), the flow openings (34, 34.1 - 34.3) adapted in the
sealing blade (10) are at least partially separated from the moving surface (11')
.
4. A sealing blade according to claim 2 or 3, characterized in that the distance (D) of the top edge of the flow openings (34) from the elongated edge
(30) of the sealing blade (10) is 15 - 50 mm.
5. A sealing blade according to claim 1, characterized in that a tip (38), which is adaptable against the moving surface (11'), is adapted on one
elongated edge (30) of the sealing blade (10).
1. Abdichtklinge, die gegenüberliegende längliche Ränder (30,31) und zwischen denselben
eine Fläche (32) aufweist und die an einen Klingenhalter (17), der in einer Beschichtungsauftragseinrichtung
(25) einer Beschichtungsvorrichtung angeordnet ist, und in Kontakt mit einer sich
bewegenden Oberfläche (11') anpassbar ist, wobei eine Kontaktfläche (33), die gegen
die sich bewegende Oberfläche (11') angeordnet sein kann und die zwischen 5 - 15 %
der Breite (W) der Abdichtklinge (10) beträgt, in der Abdichtklinge (10) vorgesehen
ist, und wobei die Abdichtklinge (10) Folgendes aufweist:
- einen Anbringbereich (37), der auf der Seite eines ersten länglichen Rands (31)
angeordnet ist, wobei die Abdichtklinge (10) dafür vorgesehen ist, von dem Anbringbereich
(37) an dem Klingenhalter (17) angebracht zu werden,
- einen zweiten länglichen Rand (30), der gegenüberliegend dem ersten länglichen Rand
(31) angeordnet ist,
- ebene Flächen (32a,32b), die auf gegenüberliegenden Seiten der Abdichtklinge (10)
zwischen den länglichen Rändern (30,31) angeordnet sind, wobei die Kontaktfläche (33)
auf einer Seite an die ebene Fläche angepasst ist,
dadurch gekennzeichnet, dass
die Fläche (32) der Abdichtklinge (10) in mehr als zwei Bereiche (35.1-35.3) unterteilt
ist, von denen die Kontaktfläche (33) in wenigstens einem Bereich (35.1) gebildet
ist, und dass die Fläche (32) der Abdichtklinge (10) mittels mehr als einem Falz (36.1,36.2)
in die mehr als zwei Bereiche (35.1 - 35.3) unterteilt ist.
2. Abdichtklinge nach Anspruch 1, wobei Strömungsöffnungen (34,34.1 - 34.3) auf der Fläche
(32) der Abdichtklinge angeordnet sind,
dadurch gekennzeichnet, dass
der größte Teil der Kontaktfläche (33) zwischen dem länglichen Rand (30) und den Strömungsöffnungen
(34,34.1 - 34.3) vorgesehen ist.
3. Abdichtklinge nach Anspruch 1 oder 2, wobei Strömungsöffnungen (34,34.1 - 34.3) auf
der Fläche (32) der Abdichtklinge angeordnet sind,
dadurch gekennzeichnet, dass
die Kontaktfläche (33) in der Abdichtklinge (10) so vorgesehen ist, dass, wenn diese
in Kontakt mit der sich bewegenden Fläche (11') ist, die Strömungsöffnungen (34,34.1
- 34.3), die in der Abdichtklinge (10) vorgesehen sind, zumindest teilweise von der
sich bewegenden Fläche (11') getrennt sind.
4. Abdichtklinge nach Anspruch 2 oder 3,
dadurch gekennzeichnet, dass
der Abstand (D) des oberen Rands der Strömungsöffnungen (34) von dem länglichen Rand
(30) der Abdichtklinge (10) 15 - 50 mm beträgt.
5. Abdichtklinge nach Anspruch 1,
dadurch gekennzeichnet, dass
eine Spitze (38), die gegen die sich bewegende Fläche (11') anpassbar ist, an einem
länglichen Rand (30) der Abdichtklinge (10) angeordnet ist.
1. Lame d'étanchéité, qui comprend des bords allongés opposés (30, 31) et une partie
plate (32) entre eux et qui est adaptable à un porte-lame (17) agencé dans un applicateur
de revêtement (25) d'un dispositif d'application en revêtement (21) et en contact
avec une surface mobile (11'), dans laquelle une surface de contact (33), qui peut
être agencée contre la surface mobile (11') et qui est de 5 à 15 % de la largeur (W)
de la lame d'étanchéité (10), est adaptée dans la lame d'étanchéité (10), et dans
laquelle la lame d'étanchéité (10) comprend :
- une zone de fixation (37) adaptée sur le côté d'un premier bord allongé (31), zone
de fixation (37) à partir de laquelle la lame d'étanchéité (10) est adaptée pour être
fixée audit porte-lame (17),
- un second bord allongé (30), qui est opposé au premier bord allongé (31),
- des surfaces plates (32a, 32b) situées sur les côtés opposés de la lame d'étanchéité
(10) entre les bords allongés (30, 31), surface plate à laquelle ladite surface de
contact (33) est adaptée sur un premier côté,
caractérisée en ce que la partie plate (32) de la lame d'étanchéité (10) est divisée en plus de deux zones
(35.1 - 35.3), à partir desquelles la surface de contact (33) est formée dans au moins
une zone (35.1), et la partie plate (32) de la lame d'étanchéité (10) est divisée
en les plus de deux zones (35.1 - 35.3) au moyen de plus d'un pli (36.1, 36.2).
2. Lame d'étanchéité selon la revendication 1, dans laquelle des ouvertures d'écoulement
(34, 34.1 - 34.3) sont adaptées sur la partie plate (32) de la lame d'étanchéité,
caractérisée en ce que la majeure partie de la surface de contact (33) est adaptée entre le bord allongé
(30) et les ouvertures d'écoulement (34, 34.1 - 34.3).
3. Lame d'étanchéité selon la revendication 1 ou 2, dans laquelle des ouvertures d'écoulement
(34, 34.1 - 34.3) sont adaptées sur la partie plate (32) de la lame d'étanchéité,
caractérisée en ce que la surface de contact (33) est adaptée dans la lame d'étanchéité (10) de sorte qu'en
contact avec la surface mobile (11'), les ouvertures d'écoulement (34, 34.1 - 34.3)
adaptées dans la lame d'étanchéité (10) sont au moins partiellement séparées de la
surface mobile (11').
4. Lame d'étanchéité selon la revendication 2 ou 3, caractérisée en ce que la distance (D) du bord supérieur des ouvertures d'écoulement (34) par rapport au
bord allongé (30) de la lame d'étanchéité (10) est de 15 à 50 mm.
5. Lame d'étanchéité selon la revendication 1, caractérisée en ce qu'une pointe (38), qui est adaptable contre la surface mobile (11'), est adaptée sur
un bord allongé (30) de la lame d'étanchéité (10).