Push-and-pull sealing disc for packaging container

Abstract

The present disclosure relates to a paperboard sealing disc for use in a packaging container, comprising a peripheral edge portion surrounding a tear-open part having a push-tab and a pull-away part. The tear-open part is delimited from the peripheral edge portion by a first cutting line in the first side and by a second cutting line in the second side. Said first cutting line being provided at a distance d1 from said sealing disc outer edge, and said second cutting line being provided at a distance d2 from said sealing disc outer edge. The push-tab is at least partly delimited from the pull-away part by a folding line. At the push-tab d1>d2 and at the pull-away part d4>d3. Furthermore, d1 at said push-tab is substantially the same as d4 at said pull-away part and d2 at said push-tab is substantially the same as d3 at said pull-away part.

Claims

1. A paperboard sealing disc for use in a packaging container, said sealing disc being delimited by a sealing disc outer edge, said sealing disc comprising a peripheral edge portion surrounding a tear-open part, said sealing disc comprising a first side and a second side, said tear-open part being delimited from said peripheral edge portion by a first cutting line provided on said first side and by a second cutting line provided on said second side, each of said first and said second cutting lines extending only partly through the thickness of said sealing disc, said first cutting line intersecting with said second cutting line at a first and a second intersection, said tear-open part furthermore comprising a push-tab and a pull-away part, said push-tab being at least partly delimited with respect to said pull-away part by a folding line, at said push-tab, said first cutting line is, at said push-tab, provided at a distance d1 from said sealing disc outer edge and said second cutting line is, at said push-tab, provided at a distance d2 from said sealing disc outer edge, said first cutting line is, at said pull-away part, provided at a distance d3 from said sealing disc outer edge and said second cutting line is, at said pull-away part, provided at a distance d4 from said sealing disc outer edge, characterized in that d1>d2 at said push-tab and that d4>d3 at said pull-away part and wherein d1 at said push-tab is substantially the same as d4 at said pull-away part and d2 at said push-tab is substantially the same as d3 at said pull-away part.

2. The sealing disc according to claim 1, characterized in that an angle of between 75° and 115° is formed by said first and said second cutting lines at each of said first and said second intersections.

3. The sealing disc according to claim 1, characterized in that said folding line extends, as a straight line, from said first intersection between said first cutting line and said second cutting line to said second intersection between said first cutting line and said second cutting line.

4. The sealing disc according to claim 1, characterized in that the difference between d1 and d2, and between d3 and d4, are each from 2 mm to 10 mm.

5. The sealing disc according to claim 1, characterized in that said sealing disc and said tear-open part each have a rectangular shape or a rectangular shape with slightly rounded corners.

6. A packaging container for bulk solids, said container comprising a tubular container body with an upper end with an upper body opening and a bottom end with a bottom body opening comprising a container bottom, said container body having an inner surface facing towards an inner compartment in said packaging container and an outer surface facing away from said inner compartment, said packaging container being closed at said upper body opening by a sealing disc characterized in that said sealing disc is a sealing disc according to claim 1.

7. The packaging container according to claim 6, characterized in that said packaging container is a paperboard packaging container.

8. The packaging container according to claim 6, characterized in that sealing disc is a container lid.

9. The packaging container according to claim 6, characterized in that said container comprises a container lid and wherein the sealing disc is a transport closure.

10. The packaging container according to claim 6, characterized in that said sealing disc is attached to said inner surface of said packaging container.

11. A sealing disc for use in a packaging container, said sealing disc being delimited by a sealing disc outer edge, said sealing disc comprising a peripheral edge portion surrounding a tear-open part, said sealing disc comprising a first layer on a first side of said sealing disc and a second layer on a second side of said sealing disc, said tear-open part being delimited from said peripheral edge portion by a first cutting line in said first layer and by a second cutting line in said second layer, said first cutting line intersecting with said second cutting line at a first and a second intersection, said tear-open part furthermore comprising a push-tab and a pull-away part, said push-tab being at least partly delimited with respect to said pull-away part by a folding line, said first cutting line is, at said push-tab, provided at a distance d1 from said sealing disc outer edge and said second cutting line is, at said push-tab, provided at a distance d2 from said sealing disc outer edge, said first cutting line is, pull-away part, provided at a distance d3 from said sealing disc outer edge and said second cutting line is, at said pull-away part, provided at a distance d4 from said sealing disc outer edge, characterized in that d1>d2 at said push-tab and that d4>d3 at said pull-away part and wherein d1 at said push-tab is substantially the same as d4 at said pull-away part and d2 at said push-tab is substantially the same as d3 at said pull-away part.

12. The sealing disc according to claim 11, characterized in that said first layer of said sealing disc is laminated to said second layer of said sealing disc.

13. The sealing disc according to claim 11, characterized in that said folding line is provided on said first side or first layer of said sealing disc.

14. The sealing disc according to claim 11, characterized in that said folding line is a slit provided on said first side or first layer of said sealing disc.

15. The sealing disc according to claim 14, characterized in that said slit being formed by a portion of said first cutting line extending between said first and second intersections between said first cutting line and said second cutting line.

16. The sealing disc according to claim 15, characterized in that said push-tab is provided in a corner portion of said tear-open part.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 illustrates a packaging container according to the present disclosure;

(2) FIG. 2 illustrates a packaging container in an open position comprising a sealing disc according to the present disclosure,

(3) FIG. 3 illustrates a sealing disc according to the present disclosure, as seen from the first side;

(4) FIG. 4 illustrates a sealing disc according to FIG. 3, as seen from the second side;

(5) FIG. 5 shows the sealing disc illustrated in FIGS. 3 and 4, with the push-tab being pressed downwards;

(6) FIG. 6 shows the sealing disc as disclosed herein, with the push-tab being folded in under the pull-away part to provide a gripping portion;

(7) FIG. 7 shows the sealing disc as disclosed herein, with the tear-open part being removed from the sealing disc.

DETAILED DESCRIPTION

(8) It is to be understood that the drawings are schematic and that individual components, such as layers of materials are not necessarily drawn to scale. The sealing discs and the packaging containers shown in the figures are provided as examples only and should not be considered limiting to the invention. Accordingly, the scope of invention is determined solely by the scope of the appended claims.

(9) FIGS. 1 and 2 illustrate a paperboard packaging container 10 for bulk solids according to the third aspect of the present disclosure. The particular shape of the container 10 shown in the figures should not be considered limiting to the invention. Accordingly, a packaging container produced according to the invention may have any useful shape or size.

(10) FIG. 1 illustrates the paperboard packaging container 10 in a closed position. The packaging container 10 has a tubular container body 11 with an upper end 12, a bottom end 14 and a container bottom 18. The container body 11 has an inner surface 19 and an outer surface 20.

(11) In FIG. 1 a container body 11 having a cuboid shape is depicted. The paperboard packaging container 10 has a front wall portion, a rear wall portion, side wall portions and curved corner portions connecting the wall portions. The curved corner portions have a radius of curvature of between 15 and 30 mm. The front and rear wall portions may be planar or may have an outwardly curved shape with a radius of curvature of from 200-700 mm. The side wall portions may be substantially planar or may have an outwardly curved shape with a radius of curvature of from 30-700 mm. However, the packaging container the may also for example have a rectangular, triangular or circular shape.

(12) As shown in FIG. 1, the packaging container 10 may be provided with a bottom reinforcement rim 23. The packaging container 10 shown in FIG. 1 further comprises a frame structure 21, which for example may be mechanically connected with an upper reinforcing rim. The frame structure 21 is in FIG. 1 provided with locking elements 22 for retaining a lid 15 in a closed position over the access opening.

(13) The application of elements such as a bottom reinforcing rim 23 to the bottom end 14 of the packaging container 10, an upper reinforcing rim to the upper body opening 13 and a frame structure 21 is optional for the packaging container 10 disclosed herein.

(14) FIG. 2 illustrates the paperboard packaging container 10 with a lid 15 in an open position. The packaging container 10 comprises the sealing disc 1 as a partially removable transport closure, attached to the inner surface 19 of the packaging container 10. Depending on whether the sealing disc 1 is applied from the upper end 12 of the container body 11 or from the bottom end 14 of the container body 11, the sealing disc 1 peripheral outer edge portion 3 which is joined to the inner surface 19 of the container body 11 will be directed downward, toward the bottom body opening or, upward toward the upper body opening 13.

(15) The sealing disc 1 which is shown in FIG. 2 is a paperboard sealing disc 1 comprising a peripheral edge portion 3 surrounding a tear-open part 4. The sealing disc 1 is shown with the first side 6 facing away from the inner compartment of the packaging container. The tear-open part 4 is delimited from the peripheral edge portion 3 by a first cutting line 5′ provided on the first side 6. The tear-open part 4 comprises a push-tab 8 and a pull-away part 4′. To facilitate downwards folding of the push-tab 8 for opening of the sealing disc 1, a folding line 9 in the form of a slit is provided between the pull-away part 4′ and the push-tab 8. As may be seen in FIG. 2 the peripheral edge portion 3 has a greater width at the push-tab 8 compared to the width at the pull-away part 4′.

(16) FIG. 3 discloses a paperboard sealing disc 1, as seen from the first side 6. The sealing disc 1 is delimited by an outer edge 2 and comprises a peripheral edge portion 3 surrounding a tear-open part 4 which is intended to be removed to provide an opening in the sealing disc 1. The sealing disc 1 is thus a partly removable sealing disc 1, which leaves the peripheral edge portion 3 of the sealing disc 1 attached to the inner wall 19 of the container body 11. The remaining part of the sealing disc 1 may contribute to stabilizing the container opening 13.

(17) The tear open part 4 is, at the first side 6 of the sealing disc 1, delimited from the peripheral edge portion 3 by a first cutting line 5′ which has been made into the sealing disc 1 from the first side 6. The cutting line 5′ is a continuous cutting line extending into the sealing disc by a cutting depth of from 15 to 80% of the sealing disc 1 thickness. The tear-open part 4 is delimited from the peripheral edge portion 3 at the second side 7 of the sealing disc 1 by a second cutting line 5″, shown in this figure as a dotted line. The cutting line 5″ is also a continuous cutting line which has been made into the sealing disc 1 from the second side 7 with a cutting depth of from 15 to 80% of the sealing disc 1 thickness. The first cutting line 5′ and the second cutting line 5″ may either each have a depth of about 50% of the sealing disc thickness or may each have a depth such that the sum of the total depths equals the sealing disc thickness. The first cutting line 5′ is, at the push-tab 8, provided at a distance d.sub.1 from the sealing disc outer edge 3 and the second cutting line 5″, provided at the second side 7, is, at the push-tab 8, provided at a distance d.sub.2 from said sealing disc outer edge 2. The first cutting line 5′ is, at the pull-away part 4′, provided at a distance d.sub.3 from the sealing disc outer edge 3 and the second cutting line 5″, provided at the second side 7, is, at the pull-away part 4′, provided at a distance d.sub.4 from said sealing disc outer edge 2. As may be seen in figure, d.sub.1 is greater than d.sub.2 where the push-tab 8 is delimited from the peripheral edge portion 3 while, where the pull-away part 4′ is delimited from the peripheral edge portion 3, d.sub.4>d.sub.3.

(18) FIG. 4 illustrates the sealing disc 1 from the second side 7, with the second cutting line 5″ delimiting the tear open part 4 at the second side 7 from the peripheral edge portion 3. The first cutting line 5′, provided on the first side 6, is illustrated as a dotted line.

(19) As the distance d.sub.1, by with the first cutting line 5′ is provided from the outer edge 2, on the first side 6 is greater around the push-tab 8 than the distance d.sub.2 on the second side 7, the push-tab 8 is easier to press downwards and there is a reduced risk of breaking the material of the peripheral edge portion 3 as the paperboard material will delaminate at the thickness level of the cutting depth of the cutting line, which may be about 50% of the sealing disc 1 thickness.

(20) As illustrated in FIGS. 3 and 4, the first cutting line 5′ is intersecting with the second cutting line 5″ at a first and second intersection 24, 25 such that an angle α of between 75° and 115°, such as between 85° and 95°, is formed on the tear-open part by said first and said second cutting lines 5′, 5″ at each of the first and second intersections 24, 25. After the push-tab part 8 has been folded downwards under the pull-away part 4′, notches are formed at the peripheral edge of the tear-open part 4 where the intersections 24, 25 between the first and second cutting lines 5′, 5″ are located.

(21) FIG. 5 illustrates a sealing disc as disclosed herein, as seen from the first side 6, with the push-tab 8 being pressed downwards. As may be seen in this figure the fact that the first cutting line 5′ is provided with a distance d.sub.1 which is larger than the distance d.sub.2 at the push tab 8, as illustrated in FIGS. 3 and 4, a collar is formed at the push-tab after opening of the push-tab 8. The fact that the first and the second cutting lines 5′, 5″ are provided with a different distance from the outer edge 2 facilitates opening and minimizes the risk of tearing of the push-tab 8 or the peripheral edge portion 3 as the tearing takes place in the plane where the first and second cutting lines 5′, 5″ terminate in the interior of the sealing disc thickness and at location where the collar is formed. The fact that the cutting line does not extend throughout the entire sealing disc 1 thickness thus both has the advantage of facilitated opening and improved protection of the bulk solids. The downwards folding of the push-tab part 8 is facilitated when the first side 6 or the first layer 16 of the sealing disc 1 is optionally provided with a folding line 9 in the form of a slit which extends as a straight line from the first intersection 24 between the first and second cutting line 5′, 5″ to the second intersection 25 between the first and second cutting line (see FIG. 3).

(22) FIG. 6 illustrates the sealing disc 1, as seen from the first side 6, with the push-tab 8 being folded in under the pull-away part 4′ to provide a gripping portion which renders the opening of the remaining pull-away part 4′ easy and stable and reduces the risk of tearing of the tear-open part 4 during opening of the packaging container 10.

(23) FIG. 7 shows the sealing disc 1 comprising a first layer 16 and a second layer 17, with the tear-open part 4 being partly removed from the sealing disc 1. As may be seen in this figure the fact that the first cutting line 5′ is provided with a distance d.sub.3 which is smaller than the distance d.sub.4 at the pull-away part 4′, a collar is formed at the pull-away part 4′ by the second layer 17 of the sealing disc 1 after removal of the tear-open part 4.