WO2001096185A2 - Tightening of bottom seam - Google Patents

Tightening of bottom seam

Info

Publication number
WO2001096185A2
WO2001096185A2 PCT/FI2001/000529 FI0100529W WO2001096185A2 WO 2001096185 A2 WO2001096185 A2 WO 2001096185A2 FI 0100529 W FI0100529 W FI 0100529W WO 2001096185 A2 WO2001096185 A2 WO 2001096185A2
Authority
WO
Grant status
Application
Patent type
Prior art keywords
casing
material
plastic
package
end
Prior art date
Application number
PCT/FI2001/000529
Other languages
French (fr)
Other versions
WO2001096185A3 (en )
Inventor
Hannu Aaltonen
Original Assignee
Upm-Kymmene Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D3/00Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
    • B65D3/10Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by form of integral or permanently secured end closure
    • B65D3/12Flanged discs permanently secured, e.g. by adhesives or by heat-sealing
    • B65D3/14Discs fitting within container end and secured by bending, rolling, or folding operations
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D3/00Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
    • B65D3/22Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines with double walls; with walls incorporating air-chambers; with walls made of laminated material

Abstract

The present invention relates to a liquid package formed of paperboard-based liquid packaging laminate comprising on at least one side one or several plastic layers and that comprises a cylindrical or truncated cone-like casing (1) and an end member (3) attached to at least one end of the casing, which member is fitted inside the casing and comprises a skirt (4) turned parallel to the casing, onto which skirt the edge (6) of the casing is folded, whereby the end member (3) is attached to the casing (1) by heat sealing the mentioned overlapping areas (4, 5, 6) together. In accordance with the invention the joint (8) where the skirt (4) of the end member (3) is placed against the inner surface of the casing (1) comprises plastic material (9) on the inside of the package to close the opening between the skirt (4) and the casing (1).

Description

Tightening of bottom seam

Technical field

The present invention relates to a liquid package formed of a paperboard-based liquid packaging laminate comprising on at least one surface one or several plastic layers, and which comprises a cylindrical or truncated cone-like casing with an end member attached to at least one end of it, which end member is fitted inside the casing and comprises a skirt, turned so as to be parallel to the casing, onto which skirt the edge of the casing is folded, whereby the end member is attached to the casing by heat sealing the mentioned overlapping areas together.

Nowadays, disposable liquid packages are used more and more for packing liquid foods such as milk, juice, and wine. Usually, these liquid packages are made of pre- manufactured laminated packaging material, comprising a body layer made of paperboard, which is covered on at least one side and usually on both sides with thin gas- and liquid-tight thermoplastic layers, for example polyethylene layers.

When the types of foods mentioned above are packed in the kind of package described in the introductory paragraph, as found, for example in Finnish patent publication 102956, the sterility of the package is an essential factor considering the preservation of the liquid packed in the package. If even a small amount of bacteria is left in the package during filling, the result is that the preservation of the package, the so-called shelf life, decreases significantly. In the package described in the introductory paragraph, especially the seams between the casing and the bottom or the lid are places where sufficient sterilisation has proven to be problematic.

Summary of the invention

The object of the present invention is to produce a package, whose sterilisation can be carried out more easily and reliably than before. This can be achieved with the package according to the invention, characterised in that the joint, where the skirt is placed against the inner surface of the casing, comprises a plastic material inside the package to close the opening between the skirt and the casing. In a package according to the invention the opening between the casing and the end member, which is extremely difficult to sterilise, is filled with plastic material in accordance with the invention. In this way the liquids and steams used in the sterilisation need not penetrate into the opening because it is now closed. Most advantageously, the plastic material closing the opening is plastic material flowed from the laminate material coating of the casing and the end member, at least mainly from the area of the opening. In this way no different material is needed to fill the joint, but a sufficient amount of material can be extracted from the inner layers of the liquid packaging laminate, especially from the seam area.

Description of the drawings

The liquid package according to the invention is now described in greater detail with reference to the attached drawing, wherein Figure 1 shows by way of an example an embodiment of the liquid package in accordance with the invention, shown from above,

Figure 2 shows a cross-section of the joint between the casing and the bottom in accordance with Figure 1 and Figure 3 shows a joint in accordance with Figure 2 on a larger scale.

Detailed description of the invention

Figure 1 shows by way of an example an embodiment of the liquid package in accordance with the invention. This package comprises a cylindrical or alternatively truncated cone-like casing 1, to which ends end members 2, 3 are attached. One of the end members is equipped with a closing strip 6 that covers the outlet 7. The material of both the casing 1 and the end member 2 and/or 3 attached to it, is paperboard-based liquid packaging material, comprising on at least one side, i.e. in the ready-made package the surface inside the package, at least one layer of plastic material. If the barrier layer of the packaging laminate is an aluminium layer, there might be only one of the inner plastic layers, but if the barrier layer of the packaging laminate is ENOH, there are several plastic material layers, including this barrier layer. Figure 2 shows a cross-section from the bottom seam of the package in accordance with Figure 1, i.e. the seam between the casing 1 and the bottom 3. This seam is produced so that the bottom 3 is equipped with a skirt 4 turned perpendicular to its general plane, and this end member 3 is then inserted inside the end of the casing 1, so that the skirt 4 is pointing outwards. After this, the edge 6 of the casing 1 is folded over the skirt 4. Seaming is carried out by heat sealing, clamping with hot clamp jaws the portion 6 of the casing 1 folded over the skirt 4 at a corresponding point against the portion 5 of casing 1 which is against skirt 4. In this case, for example, a known container-forming apparatus such as the one described in Finnish patent application 981222 can be used. In it jaws similar to the ones described above, clamp the above mentioned areas 4,5,6 together, so that the plastic materials on their counter-surfaces melt and adhere to one another.

To avoid creating an opening in the joint 8, which is the place where the skirt 4 of the bottom 3 meets the inner surface of the casing 1, where bacteria might be left in spite of sterilisation, the procedure according to the invention as shown in Figure 3 has been followed. Figure 3 shows on a larger scale the joint 8 in accordance with Figure 2. As Figure 3 shows, the seam structure, in which the skirt 4 of the end member 3 is placed against the inner surface of the casing 1, is filled with plastic material 9 that closes the mouth of the narrowing opening between skirt 4 and casing 1. In this way the narrow part of the opening be closed so that the remaining opening, i.e. the opening remaining from the plastic material 9 towards the interior of the package is wide enough for the substances used in sterilisation, such as hydrogen peroxide or hot steam, to penetrate easily into this wide opening.

Plastic material 9 for the above mentioned joint is obtained most advantageously from the outer surface of the skirt 4 and inner plastic material layers of portion 5 of the casing 1 placed against it. These are fluxed to the upper edge of the opening, to point 8, by using such a compressive force and temperature in the pressing tool with which the seam is closed, that they cause the plastic materials of the above-mentioned area to flux into point 8. This can also be seen in the enlarged cross-section of Figure 3, in which at the point in question, the plastic material layers are clearly thinner than the plastic material elsewhere on the inner surfaces 10 and 11 respectively of the casing 1 and the bottom 3. The temperature of the clamp jaws needed for the fluxing of the plastic materials depends naturally on the plastic material to be fluxed, but it can be as high as 400°C.

The liquid package in accordance with the invention has been described above only by way of one exemplary embodiment and it is to be understood that some modifications can be made to it without diverging from the scope of protection defined by the attached claims. Therefore it is not excluded that the plastic material to be placed in the joint should be from elsewhere than from the layers of packaging laminates. For this purpose a suitable, fairly thin ring or the like made of plastic material, can be placed in the opening in the appropriate area of the casing and the end member, which ring would then be melted when closing the seam to fill the joint.

Claims

Claims
1. A liquid package formed of paperboard-based liquid packaging laminate comprising on at least one surface one or several plastic layers and that comprises a cylindrical or truncated cone-like casing (1) and an end member (2,3) attached to at least one end of the casing, which member is fitted inside the casing and comprises a skirt (4), turned parallel to the casing, onto which skirt the edge (6) of the casing is folded, whereby the end member (3) is attached to the casing (1) by heat sealing the mentioned overlapping areas (4,5,6) together, characterised in that the joint (8) where the skirt (4) of the end member (3) is placed against the inner surface of the casing (1) comprises plastic material (9) on the inside of the package to close the opening between the skirt (4) and the casing (1).
2. A liquid package as claimed in Claim 1, characterised in that the plastic material (9) closing the opening is plastic material fluxed from the surface coating of the laminate material of the casing (1) and the end member (3), at least mainly from the area of the opening.
PCT/FI2001/000529 2000-06-13 2001-06-05 Tightening of bottom seam WO2001096185A3 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FI20001407 2000-06-13
FI20001407A FI109345B (en) 2000-06-13 2000-06-13 liquid packaging

Publications (2)

Publication Number Publication Date
WO2001096185A2 true true WO2001096185A2 (en) 2001-12-20
WO2001096185A3 true WO2001096185A3 (en) 2002-03-28

Family

ID=8558551

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2001/000529 WO2001096185A3 (en) 2000-06-13 2001-06-05 Tightening of bottom seam

Country Status (2)

Country Link
FI (1) FI109345B (en)
WO (1) WO2001096185A3 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3157339A (en) * 1961-07-18 1964-11-17 Continental Can Co Paper cup with caulked bottom and method of making
US3439590A (en) * 1964-12-15 1969-04-22 Maryland Cup Corp Method for heat sealing
US3547012A (en) * 1967-02-16 1970-12-15 Owens Illinois Inc Two-piece plastic container and method of making same
US3944126A (en) * 1974-10-02 1976-03-16 Phillips Petroleum Company Container
US4187768A (en) * 1977-11-15 1980-02-12 Nihon Dixie Company, Limited Method for the manufacture of a paper container
US4409045A (en) * 1982-07-20 1983-10-11 Maryland Cup Corporation Method and apparatus for sealing the sidewall and bottom seam portions of two-piece containers during manufacture thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3157339A (en) * 1961-07-18 1964-11-17 Continental Can Co Paper cup with caulked bottom and method of making
US3439590A (en) * 1964-12-15 1969-04-22 Maryland Cup Corp Method for heat sealing
US3547012A (en) * 1967-02-16 1970-12-15 Owens Illinois Inc Two-piece plastic container and method of making same
US3944126A (en) * 1974-10-02 1976-03-16 Phillips Petroleum Company Container
US4187768A (en) * 1977-11-15 1980-02-12 Nihon Dixie Company, Limited Method for the manufacture of a paper container
US4409045A (en) * 1982-07-20 1983-10-11 Maryland Cup Corporation Method and apparatus for sealing the sidewall and bottom seam portions of two-piece containers during manufacture thereof

Also Published As

Publication number Publication date Type
FI20001407A (en) 2001-12-14 application
FI20001407A0 (en) 2000-06-13 application
FI20001407D0 (en) grant
FI109345B1 (en) grant
WO2001096185A3 (en) 2002-03-28 application
FI109345B (en) 2002-07-15 application

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