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Патент USA US2404741

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July 23, 1945-
‘ ‘
Filed March 27, 1942
2,404,741 _
Patented July 23, 1946
Friedrich Ottenstein, Copenhagen, Denmark;
vested in the Alien Property Custodian
Application March 27, 1942, Serial No. 436,532
In Denmark March 27, 1941
5 Claims.
In the manufacture of bottle closures of the
crown-cork-type, sealing discs of cork or of cellu
lose in a “worked” state, such as cardboard, have
faces are turned against each other whereby a.
been used.
(Cl. 215—40)
The principal object of the present invention
is, as a substitute for cork, to employ a special
kind of cellulose material one surface oi‘ which,
according to a further feature of the invention,
su?icient degree of elasticity is obtained.
In the preferred form of the invention, com
bining two layers of cellulose material in the
sealing disc, it is important for the further han
dling of the layer when placing the same in the
metal crown and pressing the crown onto the
bottle and also for the purpose of obtaining the
proper degree of elasticity, that the corrugations
is corrugated.
A further object of the invention is to secure 10 on the facing sides of the layers take up a ?xed
position adjacent to each other, so that they'are
the highest elasticity at the required points of the
not displaced in relation to each other. The po
sealing disc and for this purpose to use two or
sition of the little indentations over the surface
more discs, the dimensioning of the discs and
of each layer is not exactly uniform, and, the po
the pasting together of the same at special points
15 sition of the indentations in relation to each other
being further features of the invention.
is therefore non-uniform. It is, however, of im
The cellulose materia1 employed i. e. pulpboard
portance that the relative position be kept con
without the addition of glue or ?lling materials,
stant. The layers or discs may therefore be glued
usually used in paper making, does not in the
together, as indicated at ‘I, so that the points,
same degree as cork possess the plastic and elas
tic properties which are characteristic of this ma 20 which haye contact with each other, remain in
contact and so that on the other hand around
terial, and it is therefore, another object of the
these points areas will be found which do not
invention to take advantage of the natural quali
contact and where, when the sealing disc in its
ties of the pulpboard, including its tenacity and
entirety is subjected to high pressure, will give
toughness combined with some degree of alas
ticity; and to employ the special shaping of the
surface of the pulp obtained by rolling or pressing
the same While dry and consisting in little indenw
tations providing maximum elasticity.
These small indentations, which are only found
on one side of the disc, in no way in?uence the
structure of the mass, as they are formed during
the composition of the same, and are, therefore,
quite different from indentations made by spe
cial tools in paper board, which is hardened by
glue and ?lling materials, so that such inden
tures will considerably weaken the structure.
Cellulose material of the kind dealt with will
for the same reason be very cheap in use, as it
does not require any special treatment apart from
the one it has already been subjected to during
its drying, rolling or pressing.
When the sealing disc is placed in the part of
the bottle closure consisting of the usual outer
metal crown, the corrugated side of the disc is
turned inward towards the metal so as to give
way at points when pressure is applied to it.
The other side of the disc has a comparatively
smooth surface, so that in conventional man
ner it may be covered with a protective layer 5
of high ?exibility such as “Cellophane,” with or
without a further protective layer 5 consisting of
a, central aluminium spot.
Further, according to the invention two or
more layers of the above mentioned material may
be employed, in which case the corrugated sur
- Way and thereby increase the elasticity of the disc
It has appeared to be of the greatest advantage
to choose the diameter of one of the discs form
ing the complete sealing disc somewhat smaller
than that of the other and in a sealing disc of
this nature to glue only the central parts of the
layers forming the disc together.
Referring in detail to the drawing, Fig. 1 shows
a single layer of pulpboard according to the in
vention, and Fig. 2 shows on an enlarged scale,
a transverse cross section of a bottle closure of
thecrown cork type with a sealing disc consisting
of two layers placed th'erein, one of larger diam
eter than the other; and Fig. 3 is a view similar
to Fig. 2, showing a modi?cation.
By employing a sealing disc of the nature in
dicated, in which the two layers are only glued
together by their central parts, the outer edge of
the large layer will lie rigidly against the bend of
the outer crown shell, while the entire disc be
cause of the upper layer, which has a smaller di
ameter of less dimension, may follow the bottom
of the metal crown, when it is bent and deformed
by the pressure created, when the bottle closure
is pressed onto the bottle.
The sealing disc will under these circumstances
give way with a certain degree of resiliency. The
advantage obtained by gluing the layers together
at certain points has been described above, and
this advantage is naturally maintained in the
special embodiment dealt with here, but the dis
advantage presentedv due to the fact that the
facing sides to de?ne multiplicities of relatively
discs, when the adhesive material in the course
of time becomes hardened, and the resiliency
therefore diminished, is avoided, as only the outer
small projections, central areas of the corrugated
sides being glued together and marginal areas
thereof unglued to permit said marginal areas
to work relative to eachother as the cap is'in
edges, which should be most active because they
stalled on the bottle.
are the parts of the disc which are subjected to
the most pressure, are free to slide on each other.
The upper edge of the bottle mouth will not
terminating in a circular rounded lip, of a crown
press directly upon the extreme outer edge of the
sealing disc, but if one bisects the radius of the
same the pressure from the bottle neck will act
approximately in the centre of the middle of the
outer half of the bisected radius. By letting the
vpressure act approximately at the edge 'of the
upper layer of less diameter the same will be bet
ter adapted to give way and add to the resiliency
of the entire sealing disc.
In the drawing l is the plane part of the outer
‘metal shell, 2 the edge of the shell, and 4 and 3
the upper and lower layers of the complete seal
ing disc. As it will be seen from the drawing the
lower layer 3 has a circumference, which reaches
out to the edge of the crown cork metal shell 2,
while the upper layer 4 is somewhat smaller. If
the disc is subjected to pressure acting in the
direction of the arrow A the lower layer 3 will
give way and may be bent without meeting any
3. The combination with the mouth of bottle
type closure comprising a skirted cap to securely
10 engage over said lip and close the mouth, a seal
ing disk engaging the undersurfaceof the top of
the cap within the skirt thereof, said disk com
prising two circular plates of un?lled pulpboard
corrugated to de?ne multiplicities of relatively
15 small projections on their facing sides, said plates
being substantially plane on their other sides, and
limited centralized'areasxof the facing sides of
the plates being glued together, with the remain
ing marginal portions of the plates free and capa
20 ble of being deformed relative to each other as
' the cap is forced on the bottle with the marginal
portion of the lower ‘of the two plates in engage
ment with the lip of the bottle.
4. A sealing disk for a skirted crown type clo
25 sure to ?t over a bottle mouth, said sealing disk,
being adapted to engage the underside of the top
of the cap, said disk comprising two circular
plates of un?lled pulpboard, at least one of which
is of a diameter to substantially ?t within the
obstacles. Because of the rigidity of the material
employed, the entire sealing disc has considerable 30 skirt of the cap, the facing sides of saidv plates
elastic properties.
being corrugated to de?ne multiplicities of rela
Figure 3 shows,‘ in cross section similar to Fig
tively small projections thereon with the opposite
ure 2, another embodiment of the invention which
‘ has a Cellophane disk 5 under the disk 3, and a
sides of the plates being uncorrugated, and with
limited central areas of the corrugated sides of
smaller metal foil spot 6 on the underside of the 35 the plates glued together so as to leave marginal
‘ Cellophane disk.
portions thereof free to be deformed relative to
Having now described my invention what I
claim as new and desire to secure by Letters
Patent is:
1. In a crown type bottle closure, a skirted
cap, a sealing disk engaging the undersurface of
the top of the cap, said disk comprising two cir
cular plates of un?lled pulpboard, one of the
plates being corrugated on the side thereof fac
ing the top of the cap and being plane on its op_
each other when the closure is applied to a bottle.
5. A bottle mouth closure of the crown type in
cluding a skirted cap and a sealing disk engaging
the underside of the top of the cap and sur
rounded by the skirt of the cap, said sealing disk
posite side, and the plates being cemented to
gether over a limited centralized area whereby
being composed of two layers of puri?ed pulp
board devoid of sizing or ?lling, said two layers
being corrugated on their meeting surfacesv
whereby the natural elasticity and conformability
of the pulpboard is substantially increased, the
layer adjacent to the underside of the top of the
the edge portions of at least one of the disks is
left free to ?ex relative to edge portions of the
cap being smaller in diameter than the other
‘ other disk.
2. In a crown type bottle closure, a skirted cap,
a sealing disk engaging the undersurface of the
diameter layer is freed to be deformed relative
to the smaller diameter layer and relative to the
top and skirt of the cap as the closure is applied
top of the cap, said disk comprising two circular
plates of un?lled pulpboard corrugated on their
to close the bottle mouth.
layer whereby the peripheral portion of the larger
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