[0001] The invention relates to a cartridge for packaging polyurethane sealing materials.
[0002] Sealing materials are usually packaged into cartridges resembling to a syringe body,
with their cylindrical tubular body being similarly closed by a piston at the rear
end thereof. By acting upon the piston of a cartridge, the sealing material contained
in the cartridge, will be ejected from the delivery end of the cartridge, through
a suitable spigot-like member, once the thin diaphragm provided at the inner fore
end side thereof, has been broken open by the said piston. The spigot-like member
is provided with an external thread, such that an additional, internally threaded
spout may be screwed thereon. Both the piston and the cylindrical tubular body of
the said cartridges are usually made of plastics material.
[0003] However, plastics material cartridges cannot be used for the packaging of polyurethane
sealing materials, since the polyurethane sealing materials would leak out through
the plastics material from which the body of the cartridges is usually made, and would
undergo a gradual polymerization.
[0004] In order to obviate such a drawback, aluminum cartridges are presently used for the
packaging of polyurethane sealing materials, and the plastics material piston of such
cartridges is, in this case, preferably covered with an aluminum film.
[0005] Considerable storage problems arise, both for the manufacturers and the users, from
the present need of different cartridges having to be used for the packaging of polyurethane
sealing materials, and the other sealing materials. Moreover, the cartridge manufactures
have to face the problem arising from the fact that an adjustment of the packaging
machines is required every time a different type of the said prior art cartridges
has to be inserted into a packaging machine.
[0006] Therefore, it is desirable that the manufacturers of cartridges for packaging sealing
materials, polyurethane sealing materials included, may manufacture only one type
of cartridges of a non-metallic material, and may condition the said one type of cartridges,
so as to make the same suitable for packaging polyurethane sealing materials.
[0007] The aforementioned problem is solved by the invention with the provision of a single
type of cartridge of a non-metallic material, which can be made suitable for packaging
polyurethane sealing materials.
[0008] When polyurethane sealing materials are to be packaged into the cartridges according
to the invention, the cylindrical tubular body of said cartridges is provided with
a lining for preventing polyuretane sealing materials from leaking out through the
cartridge body, and from undergoing a gradual polymerization. The lining consists
of a metallic film, preferably a tube of polythene-covered aluminum, which is closed
at its fore end, and which by a welding operation or by using any other suitable means,
such as glues or adhesives, is bonded at least to the inner sidewall of the cylindrical
tubular body of a cartridge, so as to be caused to sufficiently stick thereon.
[0009] The cartridge for containing polyurethane sealing materials, according to the invention,
is closed at its rear end by a piston of plastics material, which is covered with
an aluminum film.
[0010] Further features of the invention, and the advantages arising therefrom will more
clearly appear from the following description, which is made by referring to the
Figures of the only sheet of drawing, in which:
Figure 1 is a longitudinal sectional view of a cartridge according to the invention,
in which the piston and the cylindrical tubular body of the cartridge are shown in
their disassembled condition.
Figure 2 is a longitudinal sectional view of the fore end section of the cylindrical
tubular body of the cartridge according to Figure 1, showing a modified embodiment
of the lining for the said cartridge body.
Figures 3 and 4 are longitudinal sectional views showing two alternative ways of closing
at its fore end the lining for the inner sidewalls and the inner fore end side of
the cylindrical tubular body of a cartridge according to the invention, before the
said lining having been inserted into the cartridge body.
Figure 5 is a longitudinal sectional view showing still a different way of closing
the fore end of the lining for the inner sidewall and the inner fore end side of the
cylindrical tubular body of a cartridge according to the invention, without the
aid of an additional insert.
Figures 6 and 7 show in a sectional view through their thickness, two different types
of materials which are usable for making the lining for the inner sidewall and the
inner fore end side of the cylindrical tubular body of a cartridge according to the
invention.
Figure 8 is a longitudinal sectional view showing a further embodiment of the invention
[0011] Referring to Figure 1, there is shown a cartridge 1 for packaging sealing materials.
The cylindrical tubular body 11 of cartridge 1, which is made of plastics material,
has a round cross-section, is open at its rear end side 2, and is closed at its opposite
fore end side by a cover 101 formed of one piece with the cartridge body 11, and being
centrally provided with a protruding spigot-like member 201, which is co-axial to
the cartridge body 11, and is provided with an external thread, such that an internally
threaded spout, not shown, may be screwed thereon. This spout may be useful for an
easier dispensing of the sealing material packaged into the cartridge 1. The features
of the cartridge as disclosed above, and the method of making same are known to those
skilled in the art.
[0012] Numeral 3 denotes the piston of plastics material which is suitably associated with
the cylindrical tubular body 11 of cartridge 1, in a tightly sealing relation with
the sidewall of the said cartridge body 11. The said piston 3 is adapted for closing
the rear end side 2 of the cartridge body 11 and for causing any sealing material,
containted in cartridge 1, to be ejected from the fore end thereof, once the protective
thin diaphragm 301 has been broken open
[0013] When polyurethane sealing materials are to be packaged into the above disclosed cartridge,
this cartridge must be made capable of holding a polyurethane sealing material, so
as to prevent the same from leaking out through the cartridge body, and from undergoing
a gradual polymerization.
[0014] The invention attains this object by providing a lining to be laid on the inner fore
end side and the inner sidewall of the cylindrical tubular body 11 of cartridge 1,
which is thus made suitable for the packaging of polyurethane sealing materials.
[0015] Thus, as shown in Figure 1, the cylindrical tubular body 11 of the plastics material
cartridge 1 for packaging poly urethane sealing materials, is provided at its inner
fore end side with a discoid lining 4 having an upstanding peripheral border 104
which contacts the lower end portion of the inner sidewall of the cartridge body 11.
The said discoid lining 4 is laid on the inner face of cover 101 closing the fore
end side of the cartridge body 11. The lining 4 is made from a punched sheet of a
known material, comprising at least one layer of aluminum having one or both of its
sides covered with a layer of polythene or any like suitable material. This material
is shown in Figures 6 and 7, wherein A denotes the aluminum layer, and B denotes the
polythene layer or layers. The inner sidewall of the cylindrical tubular body 11
of cartridge 1 is provided with a tubular lining 5 made from the same material as
the lining 4, and which is co-axially inserted into the cylindrical tubular body 11
of cartridge 1. The tubular lining 5 is of such a size that it can be caused to intimately
adhere to the whole suface of the inner sidewall of the cylindrical tubular body 11
of cartridge 1, and one end thereof is fitted into the upstanding peripheral border
104 of the discoid lining 4.
[0016] The discoid lining 4 and the tubular lining 5 are inserted and positioned into the
cylindrical tubular body 11 of cartridge 1 with the aid of one or more suitable mandrels,
which may be used also for bonding the linings 4 and 5, respectively to the inner
face of the cartridge cover 101 and to the inner sidewall of the cylindrical tubular
body 11 of cartridge 1, for example, by the known methods of heat welding, ultrasonic
welding, or high frequency welding, or by means of suitable adhesives or glues. The
said linings 4 and 5 may be separately applied to the inner fore end side and to the
inner sidewall of the cylindrical tubular body 11 of cartridge 1, or they may be simultaneously
applied to the cartridge body 11 with only one operation, by previously fitting them
onto a single mandrel. A known expansible mandrel, not shown in the drawings, is
used for inserting and positioning the tubular lining 5 into the cylindrical tubular
body 11 of cartridge 1.
[0017] Referring to Figure 2, there is shown that differently from the embodiment according
to Figure 1, the discoid lining 4 on the inner face of cover 101 of cartridge 1,
has its border 104 surrounded by the fore end portion of the tubular lining 5 for
the sidewall of the cylindrical tubular body 11 of cartridge 1
[0018] In Figures 3 and 4 there are shown two alternative ways of closing at is fore end
the lining for the inner sidewalls and the inner fore end side of the tubular body
11 of cartridge 1. Accordingly, the lining 4 is bonded to the tubular lining 5 for
the sidewall of the cylindrical tubular body 11 of cartridge 1, before the said linings
4 and 5 being inserted into the cartridge body 11, and the upstanding border 104
of this lining 4 may be internally or externally fitted, into or on the side end section
of the tubular lining 5. The assembled linings 4, 5 are then inserted into the cylindrical
tubular body 11 of cartridge 1, and the tubular lining 5 may even be the only lining
which is bonded to the inner sidewall of the cartridge body 11. The same methods as
disclosed above in relation to Figures 1 and 2, also apply here for bonding together
the linings 4, 5, and for bonding these linings to the cylindrical tubular body 11
of cartridge 1.
[0019] In Figure 5 there is shown still a different way of closing at its fore end the lining
for the inner sidewalls and the inner fore end side of the tubular body 11 of cartridge
1. The said lining consists of a tubular lining 5 which is closed at its fore end
by a transversal welding 105, the inserted lining 4 being here omitted. The closed
fore end of lining 5 is then bent down, to facilitate the insertion of this lining
5 into the cylindrical tubular body 11 of cartridge 1, and to allow the said closed
fore end of lining 5 to be easily perforated, as the thin diaphragm 301 is being perforated.
[0020] The tubular lining 5 may consist of a one-piece tube of the material as per Figures
6 and 7, or the said lining 5 may be formed from a suitably rolled up and longitudinally
welded sheet of the said material.
[0021] The piston 3 is provided with a covering formed by a film of polythene-covered aluminum.
The said covering also guarantees a metallic seal between the piston 3 and the rear
end section of the cylindrical tubular body 11 of cartridge 1.
[0022] Instead of being made of plastics material, the cartridge 1 according to the embodiment
shown in Figure 8, consists of a cylindrical tubular body 11 of cardboard, such as,
for example, a cylindrical tubular body 11 formed from a strip of cardboard being
helically wound round itself. The tubular cardboard body 11 of cartridge 1 has its
fore end side closed by a separate aluminum cover 101, which by means of a folded
seam 12 is fastened to the said tubular body 11.
[0023] The rest of the cartridge body 11 is made as disclosed by referring to Figure 1,
so that it is provided with a centrally located, threaded spigot-like member 201
which is initially closed by a thin diaphragm 301, to be perforated in known manner,
whereby the sealing material contained in cartridge 1 can be dispensed therefrom.
[0024] The tubular cardboard body 11 of cartridge 1 may be lined with an aluminum lining
5, and a disc 4 is formed integrally with the said aluminum lining 5, or it is in
form of an insert, and/or it is made according to any one of the embodiments as disclosed
by referring to Figures 1 to 5.
[0025] However, since the cover 101 closing the cylindrical cardboard body 11 of cartridge
1, according to the embodiment shown in Figure 8, is just made of aluminum, the disc
4 for lining the inner face of said cover 101, may not be provided, and the lining
5 may line only the inner cylindrical sidewall of the said cardboard body 11.
1. A cartridge of a non-metallic material, particularly of plastics material, for
packaging polyurethane sealing materials, characterized in that the inner sidewall
and the inner fore end side of the cylindrical tubular body (11) of cartridge (1),
are lined with at least one layer of any suitable metal, preferably aluminum, and
the piston (3) which is adapted for closing the rear end side of the cylindrical
tubular body (11) of cartridge (1), is covered on at least its wall or walls turned
toward the interior of cartridge (1), with at least one metal layer, the said metal
layers being provided for preventing the sealing material contained in cartridge (1)
from coming into contact with the non-metallic material from which the cartridge (1)
is made, which contact would result in the polyurethane sealing material leaking
out through the said non-metallic material, and in the polyurethane sealing material
undergoing a gradual polymerization.
2. The cartridge according to Claim 1, characterized in that the metal layer for lining
the surface of the inner sidewall and the inner fore end side of the cylindrical tubular
body (11) of cartridge (1), is in form of a tubular lining (5) of aluminum, preferably
of polythene-covered aluminum, which is closed at its fore end in any suitable way,
and is bonded in any suitable manner at least to the inner sidewall of the tubular
body (11) of cartridge 1, and the piston (3) which is adapted for closing the rear
end side of cartridge 1, also has its active surface covered with a layer of aluminum,
preferably a layer of polythene-covered aluminum.
3. The cartridge according to Claim 2, in which the lining for the inner sidewall
and the inner fore end side of the cylindrical tubular body (11) of cartridge (1),
is in form of a tubular lining (5) of aluminum, preferably of polythene-covered aluminum,
which is closed at its fore end by a disc-shaped insert (4) peripherally provided
with an upstanding border (104), which may be internally or externally fitted into
or on the fore end section of the said tubular lining (5).
4. The cartridge according to Claim 3, characterized in that the lining (4) and the
tubular lining (5) forming the lining for the inner fore end side and the inner sidewall
of the cylindrical tubular body (11) of cartridge (1), are inserted and positioned
into a cartridge (1) and are bonded to the inner surface of the cartridge body (11)
by one, or more than one successive operations.
5. The cartridge according to Claim 3, characterized in that the linings (4, 5) forming
the lining for the inner fore end side and the inner sidewall of the tubular body
(11) of cartridge (1), are bonded together before being inserted into a cartridge
(1), so that the thus assembled linings (4, 5) will be simultaneously inserted into
a cartridge (1) by only one operation, and only the tubular lining (5,) or both linings
(4, 5), may be bonded to the inner surface of the cartridge body (11).
6. The cartridge according to Claim 2, characterized in that only one tubular lining
(5) of aluminum, preferably of polythene-covered aluminum, is provided for lining
the inner inner fore end side and the inner sidewall of the cylindrical tubular body
(11) of cartridge (1), the said tubular lining (5) being closed at its fore end by
a transversal welding (105) which is then suitably bent down, to allow the tubular
lining (5) to be easily inserted into the tubular body 11 of cartridge (1), and to
be easily perforated, whereby the sealing material packaged into a cartridge (1) can
be dipensed therefrom.
7. The cartridge according to Claims 2 and 6, in which the tubular lining (5) consists
of a one-piece tube, or is formed from a rolled up, longitudinally welded sheet.
8. The cartridge according to Claim 2, in which the material forming the lining for
the inner fore end side and the inner sidewall of the tubular body (11) of cartridge
(1), consists of at least one aluminum sheet which is covered on one or both of its
sides with a layer of polythene, or any like suitable material.
9. The cartridge according to Claim 2, in which the lining (4, 5) for lining the inner
fore end side and the inner sidewall of the tubular body (11) of cartridge (1), is
bonded to the cartridge body (11) by heat welding, by ultrasonic or high frequency
welding, or by using glues or adhesives.
10. The cartridge according to any one or more of the preceding Claims, characterized
in that the cartridge (1) has a cilindrical tubular body (11) of cardboard, with the
fore end side thereof being closed by an inserted aluminum cover (101) provided with
a spigot-like dispensing member (201), which is preferably formed of one piece with
the said aluminum cover (101), and the said cardboard body (11) has at least its inner
sidewall provided with a lining (4, 5) of aluminum, preferably of polythene-covered
aluminum.
11. The cartridge according to Claim 10, characterized in that by a folded seam (12)
the inserted aluminum cover (101) is connected to the body (11) of cartridge (1).
12. The cartridge according to Claim 10, characterized in that the aluminum lining
(5) lines only the inner side-wall of the cartridge cardboard body (11).