A RECLOSABLE CONTAINER

Abstract

A reclosable container includes a container body made of a cellulosic material and having a container aperture and a movable cover of a hydrosoluble thermoplastic material applied to said container aperture.

Claims

1. A reclosable container, comprising: a container body made of a cellulosic material and having a container aperture, and a movable cover applied to said container aperture and movable between an open position and a closed position, wherein said movable cover is made of a hydrosoluble thermoplastic material.

2. The reclosable container of claim 1, comprising: a support frame made of a hydrosoluble thermoplastic material fixed to an outer surface of said container body and surrounding said container aperture, the support frame having a frame aperture overlapped to said container aperture, wherein the movable cover is hinged to said support frame along a hinge axis and is pivotally movable about said hinge axis between said open position and said closed position.

3. The reclosable container of claim 2, wherein said support frame and said movable cover comprise mutually cooperating teeth and slots integrally formed with said support frame and movable cover and engageable with each other to retain the movable cover in said closed position.

4. The reclosable container of claim 2, wherein said movable cover is formed by a flat panel having panel edges which in said closed position are in contact with respective aperture edges of said frame aperture.

5. The reclosable container of claim 2, wherein said mutually cooperating teeth and slots are provided on respective ribs of said support frame and said movable cover.

6. The reclosable container of claim 2, wherein said support frame is fixed to said outer surface of said container body by water sealing or by glue.

7. The reclosable container of claim 1, wherein the movable cover is substantially U-shaped and comprises a flat central wall and a pair of lateral walls perpendicular to said flat central wall, and wherein said flat central wall is hinged to said container body along a hinge axis extending along an edge of said container aperture and along an edge of said flat central wall.

8. The reclosable container of claim 7, wherein each of said lateral walls has a hook formation at a respective distal end, and wherein in said open position said hook formations engage respective edges of the container aperture.

9. The reclosable container of claim 7, comprising a strip of hydrosoluble thermoplastic material, fixed to the container body adjacent to the edge of said container aperture, wherein said movable cover comprises at least one flexible tooth formed integrally on the edge of said flat central wall, and wherein in the closed position of the movable cover said at least one flexible tooth snap engages an edge of said strip and retains the movable cover in the closed position.

10. The reclosable container of claim 7, wherein the container body comprises a flap of cellulosic material connected to said container body along a bending line forming said hinge axis, wherein said flat central wall of said movable cover is overlapped and fixed to said flap.

11. The reclosable container of claim 10, wherein said flat central wall of said movable cover is fixed to said flap by water sealing or by glue.

12. The reclosable container of claim 1, wherein; the movable cover comprises a flat panel of hydrosoluble thermoplastic material, slidable on an outer surface of said container body along a longitudinal direction, the reclosable container comprises a pair of straight guide sections made of hydrosoluble thermoplastic material fixed to said outer surface parallel to said longitudinal direction and extending outside of said container aperture, said flat panel is slidably movable along said longitudinal direction between said pair of straight guide sections between an open position and a closed position, said flat panel comprises two flexible engagement teeth integrally formed with said flat panel which in the closed position of the flat panel engage respective slots formed in end portions of said pair of straight guide sections.

13. The reclosable container of claim 12, wherein said pair of straight guide sections are fixed to said outer surface of the container body by water sealing or by glue.

14. The reclosable container of claim 1, wherein: the movable cover is detachable from said container body and comprises a cover top wall and a cover side wall, the cover side wall engages into said container aperture, and the cover side wall comprises at least one flexible engagement tooth integrally formed with said cover side wall, which engages at least one through window formed in an edge portion of the container body in the closed position of said movable cover.

15. The reclosable container of claim 14, wherein an L-shaped formation of hydrosoluble thermoplastic material is fixed on an upper edge of said at least one through window.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will now be described in detail with reference to the attached drawings, given purely by way of non-limiting example, wherein:

[0019] FIG. 1 is a partially exploded perspective view of a first embodiment of a container according to the present invention,

[0020] FIG. 2 is a cross-section taken along the line II-II of FIG. 1,

[0021] FIG. 3 is a partially exploded perspective view of a second embodiment of a container according to the present invention,

[0022] FIG. 4 is a cross-section taken along the line IV-IV of FIG. 3,

[0023] FIG. 5 is a partially exploded perspective view of a third embodiment of a container according to the present invention,

[0024] FIG. 6 is a cross-section taken along the line VI-VI of FIG. 5,

[0025] FIG. 7 is an enlarged detail of the part indicated by the arrow VII in FIG. 6,

[0026] FIG. 8 is a partially exploded perspective view of a fourth embodiment of a container according to the present invention,

[0027] FIG. 9 is a cross-section taken along the line IX-IX of FIG. 8,

[0028] FIG. 10 is a partially exploded perspective view of a fifth embodiment of a container according to the present invention,

[0029] FIG. 11 is a cross-section taken along the line XI-XI of FIG. 10,

[0030] FIG. 12 is a partially exploded perspective view of a sixth embodiment of a container according to the present invention, and

[0031] FIG. 13 is a cross-section taken along the line XIII-XIII of FIG. 12.

[0032] It should be appreciated that the attached drawings are schematic and various figures may not be represented in the same scale. Also, in various figures some elements may not be shown to better show other elements.

DETAILED DESCRIPTION

[0033] FIGS. 1-13 show six different embodiments of a reclosable container 10.

[0034] In all the different embodiments, the reclosable container 10 comprises a container body 12 made of a cellulosic material and having a container aperture 14. The reclosable container 10 comprises a movable cover 16 made of a hydrosoluble thermoplastic material applied to the container aperture 14 and movable between an open position and a closed position.

[0035] The term cellulosic material indicates a material primarily or completely made of cellulose, such as, paper, cardboard, cellulose pulp, and the like.

[0036] The definition hydrosoluble thermoplastic material indicates a material suitable to be submitted to common methods of heat forming, or thermoforming, of thermoplastic materials, and which dissolves in the presence of water. An example of a hydrosoluble thermoplastic material is disclosed in WO2016207849A1 which relates to a material formed by a combination of cellulose with a thermoplastic material comprising a hydrolysable or hydrosoluble polyhydroxylated polymer. The hydrosoluble thermoplastic material disclosed in WO2016207849A1 is marketed under the trade name PolyPaper by NextMaterials Srl, Milano, Italy. A remarkable feature of a hydrosoluble thermoplastic material according to WO2016207849A1 is that it is entirely recyclable in the paper chain. Therefore, a container including a container body 12 of cellulose material and a cover 16 made of a hydrosoluble thermoplastic material is recyclable in the paper chain without the need of separating 16 of hydrosoluble thermoplastic material from the container body 12 of cellulose material.

[0037] In the embodiments shown in FIGS. 1-7 the reclosable container 10 comprises a support frame 18 made of a hydrosoluble thermoplastic material. The support frame 18 is fixed to an outer surface 20 of the container body 12 and surrounds the container aperture 14. The support frame 18 may be fixed to the outer surface 20 of the container body 12 by water sealing or by glue. Water-sealing is a property of Polypaper which, having a PVOH matrix, partially melts in contact with water and can be bonded to cellulose-based materials.

[0038] The support frame 18 has a frame aperture 22 overlapped to the container aperture 14. The movable cover 16 is hinged to the support frame 18 along a hinge axis 24 and is pivotally movable about the hinge axis 24 between an open position and a closed position.

[0039] The movable cover 16 may be formed by a flat panel having panel edges 26 which in the closed position abut against respective aperture edges 28 of the support frame 18 to prevent the movable cover 16 from being pushed inside the container body 12.

[0040] The support frame 18 and the movable cover 16 comprise respective first and second closure elements integrally formed with the support frame 18 and with the movable cover 16 and cooperating with each other to retain the movable cover 16 in the closed position.

[0041] The first and second closure elements may comprise mutually cooperating teeth 30 and slot 32. In the embodiments of FIGS. 1 and 3 one or more flexible teeth 30 are integrally formed on an edge of the frame aperture 22 and are configured for engaging a corresponding slot 32 set on a corresponding edge of the flat panel forming the movable cover 16. In the embodiment of FIGS. 5-7, the flexible teeth 30 and the slots 32 are provided on respective ribs 34, 36 projecting from the flat panel forming the movable cover 16 and from the support frame 18. In the closed position, the flexible teeth 30 snap engage into the corresponding slots 32 and retain the movable cover 16 in the closed position.

[0042] In the embodiments of FIGS. 1 and 3 the container body 12 may be formed by a cardboard box. In the embodiment of FIG. 5 the container body 12 may be formed by a flexible paper bag.

[0043] In the embodiments of FIGS. 8 and 9, the movable cover 16 is substantially U-shaped and comprises a flat central wall 38 and a pair of lateral walls 40 perpendicular to the flat central wall 38. The flat central wall 38 is hinged to the container body 12 along a hinge axis 24 extending along an edge of the container aperture 14 and along an edge of the flat central wall 38.

[0044] The lateral walls 40 have respective hook formations 42 at the respective distal ends, which are configured to engage respective edges of the container aperture 14 in the open position to retain the movable cover 16 in an inclined open position.

[0045] The container body 12 may comprise a flap 44 of cellulosic material connected to a wall of the container body 12 along a folding line set on an edge of the container aperture 14. The flat central wall 38 of the movable cover 16 is overlapped and fixed to the flap 44, so that the folding line between the flap 44 and the wall of the container body 12 forms the hinge axis 24 around which the movable cover 16 is pivotally movable. The flat central wall 38 may be fixed to the flap 44 by water sealing or by glue.

[0046] A strip 46 of hydrosoluble thermoplastic material may be fixed, e.g. by water sealing or by glue, to an outer surface of the container body 12 adjacent to an edge of the container aperture 14 opposite to the hinge axis 24. The movable cover 16 may comprise one or more teeth 30 integrally formed on an edge of the flat central wall 38, which in the closed position of the movable cover 16 engage an edge of the strip 46 to retain the movable cover 16 in the closed position.

[0047] In the embodiment of FIGS. 10 and 11 the movable cover 16 comprises a flat panel 48 made of hydrosoluble thermoplastic material, slidable on the outer surface 20 of the container body 12 along a longitudinal direction A. The reclosable container 10 comprises a pair of straight guide sections 50 made of hydrosoluble thermoplastic material, fixed to the outer surface 20 of the container body 12, e.g. by water sealing or by glue. The straight guide sections 50 are parallel to the longitudinal direction A and extend outside of the container aperture 14. The flat panel 48 is slidably movable between the straight guide sections 50 along the direction A between an open position and a closed position. The straight guide sections 50 may be joined to each other by a transverse section 52.

[0048] The flat panel 48 comprises two flexible engagement teeth 54 integrally formed with the flat panel 48. In the closed position of the flat panel 48 the flexible engagement teeth 54 engage respective slots 56 formed in end portions of the straight guide sections 50 and retain the flat panel 48 in the closed position.

[0049] In the embodiment of FIGS. 12 and 13 the container body 12 has a cylindrical shape and the container aperture 14 is formed at an open top end of the container body 12. The movable cover 16 is detachable from the container body 12 and comprises a cover top wall 56 and a cylindrical cover side wall 58 which engages into the container aperture 14. The cover side wall 58 comprises at least one flexible engagement tooth 60 integrally formed with the cover side wall 58. The at least one flexible engagement tooth 60 in the closed position of the movable cover 16 engages a respective through window 62 formed in the top end of the container body 12 to retain the movable cover 16 in the closed position. In the embodiment shown in FIGS. 12 and 13 the cover side wall 58 of the movable cover 16 has two flexible engagement teeth 60 diametral opposite to each other, which engage respective through windows 62.

[0050] The container body 12 may comprise L-shaped formations 64 of hydrosoluble thermoplastic material fixed, e.g. by water sealing or by glue, on upper edges of respective through windows 62, to prevent damages to the edge of the through windows 62 during repeated opening and closing of the container.

[0051] In all the previously disclosed embodiments, the movable covers 16 of hydrosoluble thermoplastic material are only a small fraction of the total surface of the container body 12 and are therefore less prone to degradation when the container is exposed to water or moisture as compared to containers entirely made of hydrosoluble thermoplastic material. The movable covers 16 necessitate relatively small quantities of hydrosoluble thermoplastic material and therefore do not increase in a substantial way the cost of the container. Also, the movable covers 16 may ensure compliance with child-proof closure standards without compromising the recyclability of the containers in the paper chain.

[0052] Of course, without prejudice to the principle of the invention, the details of construction and the embodiments can be widely varied with respect to those described and illustrated, without thereby departing from the scope of the invention as defined by the claims that follow.