A TUBE PACKAGE

Abstract

The invention discloses a container for the packaging of compositions comprising water water-in-oil (W/O) emulsions and/or oil-in-water (O/W) emulsions, which container comprises a tube-formed body made from a paperboard comprising a fiber based substrate comprising a first ply forming a back ply, a second ply forming a top ply and a third ply forming at least one middle ply, wherein the fiber based substrate comprises CTMP. The compositions comprising W/O or O/W emulsions may be semi-solid compositions. The invention solves the problem of delamination of the multi-ply board connected to prior art solutions. In addition, the container provides the specific barriers needed to pack compositions comprising W/O- or O/W-emulsions. It further provides the required flexibility yet rigidity to be used in such tube-formed containers.

Claims

1. A container for the packaging of compositions comprising water-in-oil (W/O) emulsions and/or oil-in-water (O/W) emulsions, which container comprises; a tube-formed body made from a paperboard comprising: a fiber based substrate comprising a first ply forming a back ply, a second ply forming a top ply and a third ply forming at least one middle ply, wherein the fiber based substrate comprises CTMP.

2. A container according to claim 1, wherein the fiber based substrate exhibits a Z-tensile strength of at least 350 kPa and a Scott Bond of at least 180 J/m.sup.2.

3. A container according to claim 2, wherein the ratio between Scott Bond and Z-tensile strength is between 0.5-1.

4. A container according to claim 1, wherein the fiber based substrate exhibits a bulk of at least 1 cm.sup.3/g.

5. A container according to claim 1, wherein the third ply comprises CTMP.

6. A container according to claim 1, wherein the fiber based substrate comprises at least two plies bonded to each other without any adhesive between the at least two plies.

7. A container according to claim 1, wherein the fiber based substrate has been made by first forming a top ply on a wire using a first headbox, whereupon middle and back plies are formed successively on the top ply using a second and a third headbox.

8. A container according to claim 1, wherein the paperboard further comprises at least one barrier layer applied on a first surface of said fiber based substrate.

9. A container according to claim 8, wherein the at least one barrier layer comprises a first innermost barrier layer comprising polyolefin applied on the first surface of the fiber based substrate, a second barrier layer comprising a metal foil and/or ethylene vinyl alcohol (EVOH) and a third, outermost barrier layer comprising polyolefin, which third barrier layer forms an inner surface of the container adapted to be in contact with the content of the container.

10. A method of forming a tube-formed container for the packaging of compositions comprising water water-in-oil (W/O) emulsions and/or oil-in-water (O/W) emulsions, the method comprising: forming the tube-formed container with paperboard comprising a fiber based substrate comprising a first ply forming a back ply, a second ply forming a top ply and a third ply forming at least one middle ply, wherein the fiber based substrate comprises CTMP.

11. The method according to claim 9, wherein the tube-formed container comprises a tube-formed body and a shoulder and wherein the paperboard is used in the production of the said tube-formed body.

12. The method according to claim 10, wherein the fiber based substrate exhibits a Z-tensile strength of at least 350 kPa and a Scott Bond of at least 180 J/m.sup.2.

13. The method according to claim 10, wherein the ratio between Scott Bond and Z-tensile strength is between 0.5-1.

14. The method according to claim 10, wherein the fiber based substrate exhibits a bulk of at least 1 cm.sup.3/g.

15. The method according to claim 10, wherein the third ply comprises CTMP.

16. The method according to claim 10, wherein the fiber based substrate comprises at least two plies bonded to each other without any adhesive between the at least two plies.

17. The method according to claim 10, wherein the fiber based substrate has been made by first forming the top ply on a wire using a first headbox, whereupon the middle and the back plies are formed successively on the top ply using a second and a third headbox, respectively.

18. The method according to claim 10, wherein the paperboard further comprises at least one barrier layer applied on a first surface of said fiber based substrate.

19. The method according to claim 18, wherein the at least one barrier layer comprises a first innermost barrier layer comprising polyolefin applied on the first surface of the fiber based substrate, a second barrier layer comprising a metal foil and/or ethylene vinyl alcohol (EVOH) and a third, outermost barrier layer comprising polyolefin, which third barrier layer forms an inner surface of the container adapted to be in contact with the content of the container.

Description

[0035] In the following, an example of a paperboard suitable for the production of a tube-formed body of a container comprising the tube-formed body and a shoulder is further described.

[0036] FIG. 1 is a schematic drawing of a paperboard suitable to be used in the production of a container according to one embodiment of the invention.

[0037] The paperboard shown in FIG. 1 comprises a fiber based substrate 1, comprising five plies: a top ply (1a) made from 100 wt % bleached sulphate pulp from softwood, a back ply (1e) comprising 100 wt % unbleached sulphate pulp from softwood, a first middle ply (1b) comprising a mixture of bleached sulphate pulp and CTMP and a second and third middle ply (1c, 1d) comprising a mixture of unbleached sulphate pulp and CTMP. The fiber based substrate of the example has been made by first forming the top ply (1a) on a wire on a long base fourdriner. The first, second and third middle ply (1b, 1c, 1d) and the back ply (1e) were thereafter formed successively in the said order on the wet top ply using second, third, fourth and fifth headboxes arranged at distances in the running direction of the web. The multi-ply substrate was thereafter pressed and dried using conventional technique.

[0038] The properties of the thereof formed fiber based substrate is shown in Table 1.

TABLE-US-00001 TABLE 1 Grammage [g/m.sup.2] 215 Thickness [μm] 299 Moisture [%] 7 Z-tensile strength [kPa] 380 Scott Bond [J/m.sup.2] 200 Bending resistance 15° GM [mN] 115 Bulk [cm.sup.3/g] 1.39 Compression strength (CD)[kN/m] 3.5 Compression strength (MD) [kN/m] 5.6

[0039] The paperboard shown in FIG. 1 further comprises an innermost first barrier layer of polyethylene (2) in direct contact with the back ply (1e), a second barrier layer comprising an aluminum foil (3) and an outermost third barrier layer of polyethylene (4). The polyethylene layers (2, 4) have a thickness of around 15 μm and the aluminum foil (3) has a thickness of around 6 μm. The polymer layers are preferably extrusion coated onto the board, while the aluminum foil is laminated by use of tie layers (not shown) using conventional technology. On the top ply the paperboard may further be provided with coating layers (not shown) suitable for printing. The top ply may further be provided with a barrier layer, such as a polyolefin layer (not shown).

[0040] The paperboard described in connection with in FIG. 1 has been shown to be suitable for the manufacturing of tube-formed containers for the packaging of compositions comprising water water-in-oil (W/O) emulsions and/or oil-in-water (O/W) emulsions. Especially, the paperboard has been shown to be suitable for the formation of the tube-formed body of such a container to which a plastic shoulder is attached, without the problems of delamination of the multi-ply board connected to prior art solutions. In addition the paperboard provides the specific barriers needed to pack compositions comprising W/O- or O/W-emulsions. It further provides the required flexibility yet rigidity to be used in such containers.

[0041] While the invention has been described with reference to various exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the invention will include all embodiments falling within the scope of the appended claims.