WO2023135266A1

WO2023135266A1 - Package

Info

Publication number: WO2023135266A1
Application number: PCT/EP2023/050766
Authority: WO
Inventors: Markus PALMNÄS; Fredrik HEDVALL
Original assignee: Mcneil Ab
Priority date: 2022-01-14
Filing date: 2023-01-13
Publication date: 2023-07-20

Abstract

The present invention relates to a package for carrying loose objects, the package comprising a plurality of panels folded into a tube shape, wherein an inner surface of each panel defines an inner surface of the tube shape, and wherein a sheet of damping material is arranged on the inner surface of at least one of the panels.

Description

PACKAG E

TECH N ICAL FI E LD

[0001] The present invention relates to a package for carrying loose objects, the package comprising a plurality of panels folded into a tube shape, wherein an inner surface of each panel defines an inner surface of the tube shape, and wherein a sheet of damping matetrial is arranged on the inner surface of at least one of the panels. The package is suitable for carrying loose objects.

BACKG ROU N D

[0002] Packages, e.g. tubes and boxes, have been used for carrying and dispensing articles such as individual objects from a quantity of objects, such as chewing gums, pills, tablets, candies, etc., through an opening in the packet. Such packages are typically carried along by the consumer to have said objects at hand.

[0003] Such packages are often sufficiently small to be easily carried around in a bag or a pocket. Under such circumstances the objects in the package have a tendency to bounce around in the package generating a rattling sound that sometimes is annoying both for the person carrying the package and persons nearby. It might as well result in damages of the objects present within the package.

[0004] Some packages for carrying individual objects in separate blister packages housed in the package. By using such an implementation the rattling sound of objects bouncing around in the package is avoided. However, it is much more cumbersome to remove a single object from the package as you must take out the blister package from the package remove the object from the blister package and then reinsert the blister package in the package.

[0005] From the above it is understood that there is room for improvements and the invention aims to solve or at least mitigate the above and other problems.

SU M MARY

[0006] One object of the present invention is to provide an improved package for carrying loose objects.

[0007] The invention is defined by the appended independent claims. Additional features and advantages of the concepts disclosed herein are set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the described technologies. The features and advantages of the concepts may be realized and obtained by means of the instruments and combinations particularly pointed out in the appended claims. These and other features of the described technologies will become more fully apparent from the following description and appended claims, or may be learned by the practice of the disclosed concepts as set forth herein.

[0008] In a first aspect of the present invention a package for carrying loose objects comprises: a plurality of panels folded into a tube shape, wherein an inner surface of each panel defines an inner surface of the tube shape, and wherein a sheet of damping material is arranged on the inner surface of at least one of the panels. By arranging the sheet of damping material on the inner surface a lot of sound generated from the objects carried in the package bouncing into the panel is dampened and even avoided.

[0009] In some embodiments the damping material is of foam, which may provide both sound absorption and a dampened sound from an object hitting the panel having the damping foam, as the foam is softening the impact. The damping material may be polyurethane foam which is a material not affected by aggressive ingredients of the objects, e.g. nicotine.

[0010] In some embodiments the package further comprises a first inner end panel arranged to at least partially close a first end of the tube shape formed by the plurality of panels, wherein a sheet of damping material is arranged on an inner surface of the first inner end panel. The package may further comprise a second inner end panel arranged to at least partially close a second end of the tube shape formed by the plurality of panels, wherein a sheet of damping material may be arranged on an inner surface of the second inner end panel.

[0011] In yet some embodiments the plurality of panels includes a front panel, a back panel, a first side panel and a second side panel, wherein the inner surface of the back panel have greater area than any one of the first and second side panels, and wherein the at least one panel having damping material arranged on its inner surface is the back panel.

[0012] A further scope of applicability of the present invention will become apparent from the detailed description given below. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the scope of the invention will become apparent to those skilled in the art from this detailed description. Hence, it is to be understood that this invention is not limited to the particular component parts of the device described or steps of the methods described as such device and method may vary. It is also to be understood that the terminology used herein is for purpose of describing particular embodiments only, and is not intended to be limiting. It must be noted that, as used in the specification and the appended claim, the articles "a," "an," "the," and "said" are intended to mean that there are one or more of the elements unless the context clearly dictates otherwise. Thus, for example, reference to "a flap" or "the flap" may include several flaps, and the like. Furthermore, the word "comprising" does not exclude other elements or steps. BRI E F DESCRI PTION OF TH E DRAWI NGS

[0013] In order to best describe the manner in which the above-described embodiments are implemented, as well as define other advantages and features of the disclosure, a more particular description is provided below and is illustrated in the appended drawings. Understanding that these drawings depict only exemplary embodiments of the invention and are not therefore to be considered to be limiting in scope, the examples will be described and explained with additional specificity and detail through the use of the accompanying drawings in which:

[0014] Fig. 1 is a front view of a box according to one embodiment of the present invention, with the end panels in an unfolded condition;

[0015] Fig. 2 is a side view of a box according to one embodiment of the present invention, with the end panels in an unfolded condition; and

[0016] Fig. 3 is a view of a box blank according to one embodiment of the present invention.

[0017] Further, in the figures like reference characters designate like or corresponding parts throughout the several figures.

DETAI LE D DESCRI PTION

[0018] Hereinafter, certain embodiments will be described more fully with reference to the accompanying drawings. It will be apparent to those skilled in the art that various modifications and variations can be made without departing from the inventive concept. Other embodiments will be apparent to those skilled in the art from consideration of the specification and practice disclosed herein. The embodiments herein are provided by way of example so that this disclosure will be thorough and complete, and will fully convey the scope of the inventive concept, and that the claims be construed as encompassing all equivalents of the present inventive concept which are apparent to those skilled in the art to which the inventive concept pertains. If nothing else is stated, different embodiments may be combined with each other.

[0019] The following description focuses on an embodiment of the present invention applicable to a box having various or combined advantages such as avoiding annoying noise from objects in the box when the box is carried and such as making the box childproof or at least child resistant. The box may be used, for example, for carrying and dispensing objects, such as chewing gums, lozenges, pills, tablets, sweets etc., and, in particular, objects containing ingredients that should not be ingested by children, such as chewing gums comprising nicotine. However, it will be appreciated that the invention is not limited to this application, but may be applied to many other dispensing boxes without departing from the scope of the present invention, such as for example boxes for carrying and dispensing lozenges, pills, tablets, sweets, etc.

[0020] According to a first embodiment, according to Figs. 1 to 3, a box 100 for carrying one or more objects, such as a quantity of objects, is provided. As box 100 typically is formed by panels and is manufactured by folding a blank having defined panels and flaps. Box 100 is typically formed from a foldable material, such as carton, paper, polymers (such as polymers based on dimethyl- 2,6-naphtalene dicarboxylic or 2,6-naphtalene dicarboxylic acid monomers, such as polyethylene naphtalate (PEN) or polytrimethylene naphtalate (PTN), a copolymer of acrylonitrile and methacrylate (sold under the trade name Barex® by B.P.-Sohio), or a liquid crystal polymer), or any combination of these materials. When box 100 is a carton, paper, laminate, or cardboard box, the manufacturing costs may be kept low, while simultaneously keeping a satisfactory strength for multi-packaging of multiple boxes. When box 100 is a box of polymers, such as polymers based on dimethyl-2,6- naphtalene dicarboxylic or 2,6-naphtalene dicarboxylic acid monomers, such as polyethylene naphtalate (PEN) or polytrimethylene naphtalate (PTN), a copolymer of acrylonitrile and methacrylate (sold under the trade name Barex® by B.P.-Sohio), the reaction between the box and the contents thereof (e.g., nicotine) may be minimized.

[0021] The panels of the box may also be a laminate of at least two sheets each of which is of a material selected from the group consisting of carton, paper, polymers (such as polymers based on dimethyl-2,6-naphtalene dicarboxylic or 2,6-naphtalene dicarboxylic acid monomers, such as polyethylene naphtalate (PEN) or polytrimethylene naphtalate (PTN), a copolymer of acrylonitrile and methacrylate (sold under the trade name Barex® by B.P.- Sohio), or a liquid crystal polymer), or any combination of these materials.

[0022] The inner side of the panels may be coated with a material suitable for keeping the interior of the box moist and oxygen tight. A suitable material for coating the inner side of the panels of the box is a metal foil, such as aluminum foil.

[0023] Further, such a box may typically be obtained by folding a blank and adhesively attaching overlapping flaps, hinged to edges of the panels, to each other, as is well known to one skilled in the art.

[0024] Exemplary box 100, illustrated in Fig. 1 with its end panels unfolded, is a right- angled six-sided box with a front panel 103, a back panel 104, side-panels 101, 105 connecting opposing edges of said front panel and said back panel, and end panels 102, 106 between said side panels 101 , 105 and said front panel 103 and back panel 104, respectively. The panels of box 100 enclose a chamber for carrying objects such as, e.g., chewing gums, lozenges, pills, tablets, sweets etc.

[0025] When box 100 is a six-sided, right-angled box according to the exemplary embodiment illustrated in Figs. 1 to 3, packaging and transportation of multiple boxes is improved, since six-sided, right-angled boxes are volume effective in multi-packaging. Further, the attachment of overlapping flaps, hinged to edges of the panels of the box, to each other is improved if the panel to which the flaps are attached is planar. However, the shape of the box and the number of panels constituting the limits of the box may differ. In this respect the number of panels may be 2, 3, 4, 5 etc., whereby the panels are not necessarily planar, and the angles between the panels are not necessarily right-angled, as long as the panels define a chamber, according to the above description, for carrying at least one object, such as a quantity of objects, and also allow for overlapping flaps, being hinged to edges of box panels to be adhesively attached to each other.

[0026] One or more of the end panels 102, 106 of a box 100 formed by folding of package blank is typically formed from two overlapping flaps 201, 202, 203, 204. The flaps may be attached, such as by adhesive, to each other. Typically at least one of the end panels 102, 106 and one of the side panels 101 are formed by two overlapping flaps 201 , 202, while the other side panel 105, the front panel 103, and the back panel 104 is a single layer of the package blank.

[0027] In order to make the package less noisy when carrying objects and the box is moved around, the box 100 may be provided with damping material on the inside of the box 100. For example, see Fig 3, damping material 302, 304, 306, may be arranged on the surface of the top flap 202 facing inwards, on the surface of the bottom flap 204 facing inwards, and on the inner surface of the back panel 104. By arranging the damping material on these flaps 302, 304 and the panel 306 the sound from objects in the box 100 moving around due to the box being moved may be reduced quite a lot. The damping material may be damping the sound by being resilient and damping the impact from objects moving around in the box 100. Moreover, the material may be absorbing sound from objects hitting each other and/or panels of the box 100 that are not provided with the damping material. Sound damping effect may be achieved by arranging damping material on fewer surfaces of the box 100 as well, however, the effect is more pronounced the more surfaces of the box 100 that are provided with the material. Hence, the material may also be arranged on the inner surface of the front panel 103 and/or on the inner surface of any one or both of the side panels 101, 105.

[0028] The damping material may be a foam of polyurethane, polycarbonate, polyester, polyethylene, etc. One advantage of the polyurethane foam is that it may be advantageously used in packages where the objects carried includes nicotine as the polyurethane is nicotine resistant. The damping material may alternatively be of paper, e.g. corrugated paper sheets.

[0029] In some embodiments the blank is provided with the damping material before it is folded into a box 100. The damping material may be punched out from larger sheets or be cut in any other way known to the skilled person. When suitable sized sheets or damping material has been manufactured the damping material may be attached to the blank of the package by adhesive, e.g. a suitable glue. [0030] While the panels, which may be single layers of the package blank, typically are tamperproof, the outer flap in the panels formed by overlapping flaps, such as the panel formed by overlapping flaps 201 , 202, may be separated from the inner flap, although being adhesively attached to each other. By arranging the outer flap such that fragments 110 are released therefrom, if attempts to separate the outer flap 201 from the inner flap 202 are made, access to objects present within the box may be prevented or at least delayed, as a major part of the outer flap has to be removed piece-by-piece in order to get access to the objects within the box. This is of great benefit for preventing children from getting access to objects contained in the box, such as when such objects comprise nicotine or other pharmaceutical substances, since children most often lack persistence in manipulating the same part of a box for an extended period of time to get access to the contents of the box. Thus, tampering for a longer period of time without resulting in access to the objects within the box may be achieved.

[0031] Accordingly, in the above-disclosed box, at least one of the end panels 102, 106 or at least one of the side panels 101, 105 may be formed from a pair of overlapping flaps, extending from separate panels. The outer flap 201, 203 may be adhesively attached to the corresponding inner flap 202, 204. Thus, access to the object(s) within the box is prevented or at least impeded significantly. In order to completely prevent or at least delay unauthorized access to the objects within the box, the outer flap is arranged to release fragments if being tampered with. In other words, tampering with the outer flap (to release it from the inner flap to access the contents of box 100) results in gradual fragmentation of the outer flap so that the outer flap cannot readily be removed from the inner flap as a single piece. The individual trying to access the contents of box 100 must persistently continue to tear away fragment after fragment in order to separate the outer flap completely from the inner flap, thereby to access the contents of box 100.

[0032] As both of end panels 102, 106 may be tampered with, it is preferred that both comprise such pairs of overlapping flaps 201 , 202, 203, 204, and that the outer flap 201 , 203 in both panels are arranged to release fragments if being tampered with.

[0033] Although side panels 101 , 105 typically are longer than end panels 102, 106 and thus less prone to tampering, as the outer flap 201, 203 is more difficult to separate from the inner flap 202, 204, it is nonetheless preferable if one of side panels 101 , 105 comprises such a pair of overlapping flaps and that the outer flap 201, 203 is arranged to release fragments 110 if being tampered with.

[0034] The outer flap 201 , 203 may be arranged in different ways so that it may release fragments if being tampered with. Such arrangements may be used individually or may be combined in order to achieve synergistic effects.

[0035] According to one embodiment, such as the embodiment illustrated in Figs. 1 to 3, outer flap 201 , 203 of end panels 102, 106 is provided with a grid structure formed of intersecting weakening lines 111. Weakening lines 111 may be arranged as two sets of parallel weakening lines 111 , said sets being perpendicular to each other. In between weakening lines 111 , and as a result of tearing along weakening lines 111 , fragments 110 are obtained. Outer flap 201 , 203 thus has at least two weakening lines 111 , which cross each other at least at one point. Weakening lines 111 may be notch lines or perforation lines. A notch line is, in this context, intended to be interpreted as a line of a continuous or discontinuous notch, where a notch does not pass through the whole thickness of the material, but only through a part of the thickness of the material, while a perforation line, in this context, is intended to be interpreted as a line of perforation(s), where a perforation passes through the whole thickness of the material. By having groups of parallel weakening lines 111 , wherein the lines may extend from one edge of the flap to another, the lines will divide the flaps into regions, i.e., fragments 110. Upon tampering, rupture of the flap will be caused, whereby one region/fragment 110 at a time will be released, thus preventing or at least prolonging the time for access to the content of the box. As outer flap 201 , 203 is adhesively attached to corresponding inner flap 202, 204, attempts to separate outer flap 201 , 203 from inner flap 202, 204 will cause outer flap 201 , 203 to rupture at weakening line 111 , whereby a fragment or several fragments 110 is/are released. Further, the presence of two weakening lines 111 , which cross each other at least at one point, will provide the flap with a weakening point. The presence of two weakening lines 111 crossing each other, and thus also providing a weakening point, will imply that the outer flap may release a fragment 110 and not just be ruptured if tampered with. Further and importantly, the flap will typically start to rupture at the crossing point, i.e., the weakening point, or at the edge of the flap if at least one of weakening lines 111 extends to or is close to the edge of the flap.

[0036] When weakening line 111 is a perforation line a sequential rupture of the weakening line 111 along itself may be assured, since parts of the weakening line 111 are already broken, whereby the release of fragments 110 may be improved.

[0037] By having at least three (3), such as at least five (5), at least ten (10), or even at least twenty (20), weakening lines 111 , wherein each of the lines crosses at least one of the other lines at least at one point, the number of fragments 110 which may be released may be increased.

[0038] Such weakening lines may, independent of each other, be straight lines, curved lines or lines comprising straight linear parts, which are at an angle with respect to each other, such as L-shaped, U-shaped, or zigzag lines. Straight lines or lines comprising straight linear parts may be easier to achieve by punching.

[0039] At least one end of the weakening lines as disclosed herein may extend to an edge of said flap or at least in a proximity to the edge. Thereby rupture is typically initiated at the edge upon tampering.

[0040] In addition, or as an alternative to notch lines or perforation lines, only portions of the outer flap may be adhesively attached to the inner flap, thus permitting fragments to be formed by non-adhered portions between the inner flap and the outer flap upon tearing along select weakening lines. These non-adhered portions may be arranged in a set of parallel lines, in comparison with one of the sets of lines in the embodiment according to Figs. 1 to 3. It is also possible to arrange non-adhered portions 8 as a grid structure, in line with the embodiment disclosed in Figs. 1 to 3, by arranging two parallel lines, wherein the two sets are perpendicular to each other. Thereby, rupture may occur at the borderline of attached and non-attached portions of the outer flap. Accordingly, fragments of the flap may be released upon tampering. Typically, the outer flap is adhesively attached to the inner flap by use of a suitable adhesive. The attached portions may correspond to regions of the flap separated by the notch lines or perforation lines. Further, it may be sufficient if only portions of such regions are attached. However, it is preferred if a major part, such as at least 75%, of such a region is attached.

[0041] Further, as an alternative or in addition to notch lines or perforation lines, and/or only partly attaching the outer flap to the inner flap, the outer flap may have a laminated structure. At least portions of the innermost layer of the laminate may be securely attached to the inner flap. Thereby, outer layer(s) of the laminate or fragments of the outer layer(s) of the laminate may be ripped off without removing the entire flap. As the laminate comprises several layers, more fragments (layered together) have to be ripped off before the entire flap may be removed.

[0042] A box, as disclosed herein, may be used for carrying and dispensing objects, such as objects (chewing gums, lozenges, pills, tablets, etc.). It is preferred that box 100 has child resistant opening means to allow for child resistant dispensing of objects from within box 100. Box 100 may be a package for solid or semi-solid pharmaceutical dosage forms comprising one or more substances for treating tobacco dependence. The substance for treating tobacco dependence may be nicotine. Thus, in one specific embodiment box 100 is a package for chewing gums comprising nicotine.

[0043] A box formed in accordance with the above-described principles of the present invention may further comprise at least one outer casing 107, and at least one inner casing 108, telescopingly arranged within outer casing 107, such as disclosed in published patent applications WO 2006/131830 and WO 2008/062304, hereby incorporated by reference herein in their entireties. The inner casing may then be provided with an opening on the side or front panel of box 100. Inner casing 108 is accommodated slidably within outer casing 107, capable of movement thus between a first closed configuration and a second open configuration. In the closed configuration, inner casing 108 is retracted and outer casing 107 located over the opening (not shown), concealing it completely, as illustrated in Figs. 1 to 3, thereby closing box 100 and enclosing the object(s) contained therein. In the open configuration, inner casing 108 is extended a certain distance from outer casing 107, with the opening exposed at least in part. Outer casing 107 will then be located over the opening.

[0044] In one embodiment, outer casing 107 appears as a right parallelepiped with a rectangular base, presenting a bottom of box 100, and a side panel made up of four faces. Outer casing 107 presents an open end opposite to the bottom of inner casing 108 and box 100, and serves to accommodate inner casing 108. Inner casing 108 appears likewise as a parallelepiped having a rectangular base, presenting a top of box 100, a side panel made up of four faces, and an open end opposite the rectangular base of box 100. An opening will preferably then be arranged on one of the four faces of the side panel of inner casing 108.

[0045] Inner casing 108 is telescopically inserted into outer casing 107 with its open end first, such that the base of inner casing 108 will form the top of box 100, (end panel 102) and the base of outer casing 107 will form the bottom of box 100, i.e., end panel 106. Preferably, inner casing 108 fits only part of the way into outer casing 107, even in the closed configuration, without reaching the bottom of outer casing 107. Inner and outer casings 108, 107 combine to delimit the chamber of box 100 serving to contain the product(s), and varying in volume as the mutually slidable casings are displaced relative to each other. The chamber containing the product(s) communicates with surrounding outside space by way of the opening in inner casing 108. Inner casing 108 slides along a longitudinal axis X of box 100 between the retracted condition, i.e., closed configuration, mentioned above, in accordance with the disclosure in Fig. 1.

[0046] In the closed configuration, the edge of the side panel of outer casing 107 defining the open end of outer casing 107 is substantially flush with the edge between the side panel and the base of inner casing 107. The opening will be breasted by a side panel of outer casing 107. In an open configuration, inner casing 108 is slid outwardly from outer casing

107, such that the opening in inner casing 108 is exposed above the edge of the side panel of outer casing 107 defining the open end of outer casing 107.

[0047] Stabilizing means are arranged interposed between inner casing 108 and outer casing 107, serving to stabilize the open and the closed configuration, respectively, such that the box will neither open accidentally when not in use, nor close accidentally while the contents are being dispensed. Such stabilizing means function by exploiting the pliable nature of the material from which they are fabricated, generally carton, paper, laminate, Barex®, or plastic. In this instance, such means could therefore be described as flexible stabilizing means. More precisely, the stabilizing means comprise at least one connecting appendage hinged to the side panel of outer casing 107 and to the side panel of inner casing

108, which is breasted in sliding contact with the aforementioned side panel of outer casing 107. The appendage may, for example, be attached at one end to the edge defining the open end of inner casing 108, and on the other end to inner side of the side panel of outer casing 107. An exemplary stabilizing means is illustrated in published patent applications WO 2006/131830 and WO 2008/062304, incorporated, above, in the present application.

[0048] Several variants of boxes having child resistant opening means are known in the art. In Fig. 2, a lock member 109 is disclosed. Lock member 109 may be created by providing a raised edge protruding outwardly from the side panel of inner casing 108. In a closed configuration of box 100, i.e., when inner casing 108 is in a retracted position in outer casing 107, the raised edge of inner casing 108 engages a corresponding raised edge on the inside of the side panel of outer casing 107. When the raised edge on inner casing 108 is pushed inwardly, it will lose engagement with the raised edge on outer casing 107, whereby inner casing 108 will be outwardly slidable along longitudinal axis X, illustrated in Fig. 1. Pushing of the raised edge on inner casing 108 will be facilitated by marking the corresponding position on the outside of box 100. It will further be facilitated by a through slot in the side panel of outer casing 107 on said corresponding position, such that the slot substantially corresponds to the engagement position in at least one point on said slot. Preferably said slot is curved, whereby the pushing is further facilitated since it will be possible to push the raised edge on inner casing 108 further inwardly without simultaneous movement of outer casing 107 in the same direction.

[0049] Although the present invention has been described above with reference to specific embodiments, it is not intended to be limited to the specific form set forth herein. Rather, the invention is limited only by the accompanying claims and, other embodiments than the specific above are equally possible within the scope of these appended claims. Various additions, modifications, and substitutions may be made therein without departing from the spirit and scope of the present invention. In particular, it will be clear to those skilled in the art that the present invention may be embodied in other specific forms, structures, arrangements, proportions, and with other elements, materials, and components, without departing from the spirit or essential characteristics thereof. One skilled in the art will appreciate that the invention may be used with many modifications of structure, arrangement, proportions, materials, and components and otherwise, used in the practice of the invention, which are particularly adapted to specific environments and operative requirements without departing from the principles of the present invention.

[0050] The various embodiments described above are provided by way of illustration only and should not be construed to limit the invention. For example, the principles herein may be applied to any remotely controlled device. Those skilled in the art will readily recognize various modifications and changes that may be made to the present invention without following the example embodiments and applications illustrated and described herein, and without departing from the scope of the present disclosure.

Claims

CLAI MS

1. A package for carrying loose objects, the package comprising: a plurality of panels folded into a tube shape, wherein an inner surface of each panel defines an inner surface of the tube shape, and wherein a sheet of damping material is arranged on the inner surface of at least one of the panels.

2. The package of claim 1 , wherein the damping material is of foam.

3. The package of any one of claims 1-2, wherein the damping material is polyurethane foam.

4. The package of any one of claims 1-3, wherein the package further comprising a first inner end panel arranged to at least partially close a first end of the tube shape formed by the plurality of panels, wherein a sheet of damping material is arranged on an inner surface of the first inner end panel.

5. The package of any one of claims 1-4, wherein the package further comprising a second inner end panel arranged to at least partially close a second end of the tube shape formed by the plurality of panels, wherein a sheet of damping material is arranged on an inner surface of the second inner end panel.

6. The package of any one of claims 1-5, wherein the plurality of panels includes a front panel, a back panel, a first side panel and a second side panel, wherein the inner surface of the back panel have greater area than any one of the first and second side panels, and wherein the at least one panel having damping material arranged on its inner surface is the back panel.