GB2408499A

GB2408499A - Boxes comprising a display tray and detachable cover

Info

Publication number: GB2408499A
Application number: GB0413384A
Authority: GB
Inventors: David Taylor; Roger Newman
Original assignee: Smurfit UK Ltd
Current assignee: Smurfit Kappa UK Ltd
Priority date: 2003-11-25
Filing date: 2004-06-16
Publication date: 2005-06-01
Also published as: GB0327334D0; GB0413384D0

Abstract

A box formed from a single blank has a cover which is detachable from a display tray by tearing along at least one line of weakness 44,46. Inner layers 40,42 of opposed walls of the tray have tabs 48,50 which engage in slots 88,90 to inhibit inward movement of said layers. Alternatively, (Fig.5), a loaded box can be converted into a display tray by a user inserting a finger through an opening 296 in a front panel 252 to pull a tab 258 up and to detach the tab from the panel. As the tab is connected to tape 294 across the top of the box this is removed with the tab. The majority of the cover is removed by tearing the top panels 266, 268 and 274 along the lines of weakness 270, 272 and 276 and the front panels 252 and 254 are removed by a user pulling vertically to tear the panels 252 and 254 off along the line of weakness 244. A display tray comprising side walls 216 and 218 and rear and front walls 220 and 210 is then left with the contents being visible through a cut out portion.

Description

BOXES COMPRISING A DISPLAY TRAY AND DETACHABLE COVER

The present invention relates to boxes comprising a detachable cover and a display tray made from a single sheet of material, forming such a box from a single flat blank, a flat blank for making into such a box and a method of detaching a cover from such a box.

FR 2 713 597 discloses a box that is made from a single flat piece of material. The box includes a cover and a display tray that are connected together by lines of weakness. Goods are transported in the box and, when the goods are to be displayed, the cover is tilted upwardly in a pivotal movement to rip the cover off the box by tearing the lines of weakness. However, the inner sides of the box are loose and can swing into the interior of the box making it difficult to load goods.

EP 0 763 473 has attempted to solve this problem by gluing or stapling facing surfaces of the tray and cover together. This involves an extra manufacturing stage and increases the cost of the box. In addition, when the cover is ripped off, in a pivotal movement, the display tray may become damaged and the contents may also be damaged or disturbed as may be the case with the box of the French publication.

Both of the above boxes suffer from having relatively weak side walls that render them likely to buckle when they are stacked upon each other whether stacking occurs of the complete box or whether stacking is of display trays only.

It is an object of the present invention to attempt to overcome at least one of the above or other disadvantages.

According to one aspect of the present invention a box comprises a display tray and a cover made from a single sheet of material, with the cover being detachable from the tray by tearing occurring along at least one line of weakness, the tray and cover both including at least one layer extending along at least part of one upwardly extending wall of the box, with the inner of those layers mechanically engaging with another part of the box to inhibit movement of that inner layer inwardly into the space defined by the box.

The inner layer may mechanically engage with another part of the box at at least two or three spaced locations such as the base region or a side portion or an upper region or spaced upper regions such as opposed side regions or any combination thereof. Such engagement may be by means of at least one tab.

The inner layer may include a tab arranged to engage with a slot. The inner layer may be part of the cover.

The inner layer may include a fold at at least one edge which may comprise a 180 fold. The tab may be at an opposed edge.

The inner layer may include two further tabs, each arranged to engage with a slot at a respective spaced location. The tabs may be located on opposing sides of the inner layer.

There may be at least one opening in the box adjacent to a line of weakness whereby, in use, an operative may engage with a layer inwardly of the opening to push the inner layer inwards and thereby detach the parts at that line of weakness. There may be two such holes in the box spaced from each other which may be on the same upwardly extending layer. The line of weakness may be in the region of the base of the box and, alternatively or additionally may be in the region of the mechanical engagement. The opening or openings may be in the display tray. The operative may be required to push through openings in two layers to engage a layer inwards of the opening.

The box may include the inner layer being retained in position at at least one edge and preferably at at least two edges and those edges may be adjacent to each other.

At least one and preferably two edges of the inner layer, which may be adjacent edges, may be free edges, unconnected to other parts of the box.

The box may include at least two layers extending at least part and preferably the whole depth of the box at at least part of one upwardly extending wall. The box may include at least three layers extending at least part of the depth of the box and preferably all three may extend the whole depth of the box at at least one upwardly extending wall.

There may be two different walls extending along at least part of the upwards extent with each wall having any of the above described features. Those walls may be opposing walls and may be side walls.

When the cover is detached from the tray, the tray may have at least one wall having at least two layers extending the complete depth of the wall along at least part of the extent of the wall. When the cover is detached from the tray, the tray may present clean die cut edges.

At least part of the cover may be arranged to be removed by lifting the cover upwardly in a generally linear direction. At least part of the cover may be arranged to be removed or detached or both by lifting the cover in a generally upwardly extending direction.

The present invention also includes a method of forming a box from a single flat blank to form a cover and a display tray, the method comprising folding the blank so that the tray and cover both include at least one upwardly extending wall having two layers extending at least part of the depth of the box, the inner layer of that wall being caused to mechanically engage with another part of the box to inhibit movement of that inner layer inwardly into the space defined by the box, the blank including at least one line of weakness to enable detachment of the cover from the tray.

The method may comprise forming a box as herein referred to.

According to a further aspect of the present invention there is provided a flat blank of material including fold lines and at least one line of weakness, the blank being foldable to form a box comprising a display tray and a cover in which the cover is detachable with at least one upwardly extending wall having two layers extending at least part of the depth of that wall over at least part of the extent of that wall with the inner layer of that wall mechanically engaging with another part of the box to inhibit movement of that wall inwardly into the space defined by the box.

The blank may be arranged to be formed into a box as herein referred to or by a method as herein referred to or both.

According to another aspect of the present invention there is provided a box formed from a single piece of material, the box comprising a detachable cover and display tray, the box including at least two layers extending the complete depth of at least one upwardly extending wall over at least part of the extent of that wall.

At least one layer may extend to the complete depth of the wall over the complete extent of the wall. At least two layers that extend the complete depth of the wall may also extend the complete width of the wall at at least one location and may so extend at the same location which may be at the upper region of that wall.

The box may be arranged to leave the display tray with at least one wall having at least two layers extending the complete depth of the wall over at least part of the extent of that wall when the cover is removed.

The box may have two upwardly extending walls each having any of the features as herein referred to. These walls may be opposed walls and may comprise side walls.

The present invention also includes a stack of such boxes or stack of display trays of at least 5 or at least 10 deep.

The present invention also includes a method of making a box from a flat single piece of material comprising folding the material to form a box having a display tray and a detachable cover, the folds forming a box having at least one upwardly extending wall having at least two layers extending the complete depth of the box over at least part of the extent of that wall.

The method may comprise making a box as herein referred to.

According to a further aspect of the present invention there is provided a flat blank of material provided with folds whereby, when the blank is folded, a box comprising a detachable cover and display tray is provided with at least one upwardly extending wall having two layers extending the complete depth of the wall over at least part of the extent of that wall.

The present invention also includes a flat blank provided with folds whereby, when the blank is folded a box as herein referred to is formed.

According to another aspect of the present invention, a box formed from a single piece of material comprises a display tray and a detachable cover, the cover being arranged to be detached from the display tray by pushing a layer to cause detachment along at least one line of weakness.

The layer that is pushed may be arranged to have at least one line of weakness and preferably two spaced lines of weakness.

The layer that is pushed may be an upwardly extending layer.

The layer that is pushed may be accessed through at least one opening in another layer or layers.

The layer that is pushed may be arranged to be pushed in the region of the line of weakness which may be located at a lower region of the box.

The cover may be arranged to be detached by pushing two different layers, for instance at the same time to cause detachment along at least one line of weakness of each layer. The layers may be opposed layers and may be side layers. Each layer may have any of the herein referred to features.

The cover may be arranged to be lifted upwardly in a generally linear direction after detachment of the cover to remove the cover from the display tray.

According to another aspect of the present invention, a method of detaching a cover from a box formed from a single piece of material comprising a cover and a box comprises pushing at least one layer to cause detachment of the cover along a line of weakness.

The present invention also includes a flat blank arranged to be formed into a box comprising a detachable cover and display tray, with the cover being arranged to be detached by pushing to cause detachment along at least one line of weakness in the flat blank.

According to another aspect of the present invention, a box formed from a single piece of material comprises a display tray and a detachable cover, the cover being arranged to be detached from the display tray by pulling a layer to cause detachment along at least one line of weakness.

The layer that is pulled may be arranged to have at least one line of weakness.

The layer that is pulled may be an upwardly extending layer.

The layer that is pulled may be arranged to be pulled in the region of the line of weakness which may be located at a lower region of the box. The layer that is pulled may be arranged to be pulled upwardly.

According to another aspect of the present invention, a method of detaching a cover from a box formed from a single piece of material comprising a cover and a box comprises pulling at least one layer to cause detachment of the cover along a line of weakness.

The method may comprise detaching a cover from a box as herein referred to.

The present invention also includes a flat blank arranged to be formed into a box comprising a detachable cover and display tray, with the cover being arranged to be detached by pulling to cause detachment along at least one line of weakness in the flat blank.

The present invention also includes a flat blank for making into a box as herein referred to.

The flat blank or the single piece of material may comprise cardboard such as corrugated cardboard which may have a planar sheet secured to at least one and preferably both sides.

The present invention includes any combination of the herein referred to features or limitations.

The invention can be carried into practice in various ways but one embodiment will now be described by way of example and with reference to the accompanying drawings, in which: Figure 1 is a plan view of a flat blank to be made into a box comprising the display tray and the detachable cover, according to a first embodiment of the invention; Figure 2 is a front view of the box of Figure 1, ready for supply to a customer in a flat configuration; Figure 3 is a perspective view of the assembled box of Figure 1, and Figure 4 is a perspective view of the display tray of Figure 1, after removal of the cover; Figure 5 is a plan view of a flat blank to be made into a box comprising the display tray and the detachable cover, according to a second embodiment of the invention) Figure 6 is a plan view of the flat blank of Figure 5, with the front panel glued in position; Figure 7 is a perspective view of the assembled box of Figure 5i and Figure 8 is a perspective view of the display tray of Figure 5, after removal of the cover.

The flat blank shown in Figure 1 includes two parts which comprise a box for carrying goods in transit. The two parts can later be separated to remove a cover and leave a display tray for the contents of the box.

The display tray includes panels that will extend upwardly during use comprising a front wall 10 which is connected by parallel valley folds 12 and 14 on each side to side panels 16 and 18. The panel 18 is connected to a rear wall 20 by a parallel fold 22. Each of the upwardly extending panels is connected to panels that will form the base of the box. These connections are by way of valley folds 24, 26, 28 and 30 to base panels 32, 34, 36 and 38 respectively. Each side panel is connected to a further side panel 40 and 42 by valley folds 44 and 46. When viewing Figure 1, the top edge of the side panels 40 and 42 are defined by lines of weakness 44 and 46 at each side of those panels which include a projecting tab 48 and 50 formed by a cut in the material that does not quite extend to the sides of those panels. The rear wall 20 is defined, at its upper end, by a line of weakness 52 that extends in an arc, downwardly from the top of each end of the panel.

The lines of weakness may be defined by a series of perforations. When the lines of weakness 44, 46 and 52 are separated, the panels so far described comprise the display tray.

The cover comprises two side walls 54 and 56 that are connected to the side panels 40 and 42 respectively by the lines of weakness 44 and 46, which lines comprise a mountain fold when the flat blank is folded. The side walls 54 and 56 are connected to a front cover 58 by parallel folds 60 and 62 respectively. When viewed in Figure 1, the top of the side panels 54 and 56 and the top of the front cover 58 are each connected to top panels 64, 66 and 68 by respective aligned valley folds 70, 72 and 74. The remaining top panel 76 is connected to the rear wall 20 by the line of weakness 52 and it includes a valley fold 78 in line with the folds 44 and 46. The top panel 76 also includes a small upper part of the rear walls in the portion 80 defined between the fold 78 and the line of weakness 52.

A customer is supplied with the blank in a folded flat form as will now be described. The side panels 40 and 42 are moved through 180 about the folds 44 and 46 such that they lie against the side panels 16 and 18. Then the rear wall 20 is moved through 180 about the valley fold 22 to lie against part of the side panel 56. The side panels 16, 40 and 54 together with the panels 34 and 64 are moved through 90 about fold lines 12 and 60 such that the side panel 54 lies over and against the front panel 58 and part of the side panel 56. A tab 82 connected to the free edge of the side panel 16 by a valley fold 84 is then glued to either what will be the inwardly or outwardly facing surface of the rear panel 20 in the area shown by the dotted line 86 on the panel 20.

Thus the customer is provided with a compact construction made from a single piece of material, which, typically, may comprise corrugated cardboard having planar sheets attached to each surface. Figure 2 shows the compact construction.

The box is assembled to form the upwardly extending side walls by moving the rear wall or panel 20 through 90 about the valley fold 22 and moving the side panels 16, 40 and 54 through 90 about the valley folds 12 and 60. In this way the side walls are each of 3 ply thickness with, on one side, the panel 16 being outermost and with the panel 40 being sandwiched between the innermost panel 54 and the panel 16. On the other side wall the panel 42 is sandwiched between the innermost panel 56 and the outer panel 18. The panel 58, where it overlaps the front panel 10, is located inwards of that panel. At the rear, there is just the single panel 20 and the panel 80 joined by the line of weakness 52.

The base panels 32, 34, 36 and 38 are then moved through 90 about their valley folds with each panel being tucked over an adjacent panel at one side and under an adjacent panel at the other side to lock the base panels together.

The side panels are held by the tabs 48 and 50, which extend downwardly in the plane of the side walls 40 and 42, being tucked into respective slots 88 and 90 extending along and just to each side of the fold lines 26 and 28 of the panels 16, 34 and 18, 36. The inner panels 54 and 56 are held apart at the forward end by the front panel 58 that is connected to each inner panel by a fold. The top surface of each panel 54 and 56 is free as are the rear vertical surfaces of each panel 54 and 56. Thus there may be some small space between those panels 54 and 40, and 56 and 42.

The box can now be loaded through the open top. After loading the box is closed by the top panels 64, 66, 68 and 76 each being moved through 90 about their valley folds.

Each panel is alternately tucked over and under an adjacent panel at each side to lock the panels in place.

To convert the box into a display tray a user pushes their fingers through spaced openings 92 and 94 in the panels 16 and 18 and through aligned openings 96 and 98 in panels 54 and 56 and against panels 40 and 42. This pushing is just above the lines of weakness 44 and 46 and causes detachment of the panels 54 and 56 from the panels 42 and 46. Then the majority of the cover is removed by lifting vertically upwards. This does not damage the remainder of the tray and does not disturb the contents of the tray.

The remaining part of the cover is removed by a user inserting their finger through an opening 100 extending below the line of weakness 52 and pulling to tear the panels 82 and 76 off along that line.

The display tray is then left with side walls of double thickness, held in place by the tabs 48 and 50, with the contents being visible through a cut out portion 142 at the front of the box and possibly through the top of the box, if another is not stacked on top.

With the double thickness side walls extending the complete depth, resistance to buckling is provided if one display tray is stacked upon another. Even greater resistance to buckling is provided if one box is stacked upon another as three side walls extending the complete depth are provided.

The boxes or display tray may be stacked at least 5 or at least 10 deep or more.

Figure 5 shows a second embodiment of a flat blank including two parts which comprise a box for carrying goods in transit.

The display tray includes panels that will extend upwardly during use comprising a front wall 210 which is connected by parallel valley folds 212 and 214 on each side to side panels 216 and 218. The panel 216 is connected to a rear wall 220 by a parallel fold 222. Each of the upwardly extending panels is connected to panels that will form the base of the box. These connections are by way of valley folds 224, 226, 228 and 230 to base panels 232, 234, 236 and 238 respectively. The front wall 210 is connected to a front panel 240 by valley fold 242.

When viewing Figure 5, the top edge of the front wall 210 is defined by lines of weakness 244 that extend to the sides of the wall between which it is located a projecting tab 246 formed by a cut in the material. The rear wall 220 is defined, at its upper end, by spaced parallel lines of weakness 248, 250 that extend downwardly from the top, inwards of the ends of the panel and a cut edge 251 joining the lower ends of the lines of weakness 248, 250.

The lines of weakness may be defined by a series of perforations. When the lines of weakness 244, 248 and 250 are separated, the panels so far described comprise the display tray.

The cover comprises front panel 252 that is connected to the front panel 240 by the line of weakness 244, the line comprising a mountain fold when the flat blank is folded.

When viewed in Figure 5, the top of the front cover 252 is connected to top panel 254 by an aligned valley fold 256.

A tab 258 is formed in the panel 252 by a cut edge 260 formed along the fold 256, a cut edge 261 extending parallel thereto and lines of weakness 262 and 264 extending therebetween. Top panels 266 and 268 are connected to the respective side walls 216 and 218 providing respective aligned valley folds 270 and 272. The remaining top panel 274 is connected to the rear wall by valley fold 276 in line with the folds 270 and 272. The valley folds 270, 272, and 276 are lines of weakness. The cover also includes a small upper part of the rear wall 220 in a portion 278 defined between the fold 276, the lines of weakness 248 and 250 and the cut edge 279. The portion 278 forms a tab.

A customer is supplied with the blank in a folded flat form as will now be described. The front panel 240 is moved through 180 about the folds 242 and 244 such that it lies between the front wall 210 and the front panel 252 as shown in Figure 6. The rear wall 220 is then moved through 180 about the valley fold 222 to lie against part of the side panel 216. The side panel 218 is moved through 180 about fold line 214 such that the side panel 218 lies over and against the front panel 252 and part of the side panel 216. A tab 280 connected to the free edge of the rear wall 220 by a valley fold 282 is then glued to either what will be the inwardly or outwardly facing surface of the side panel 218 in the area shown by dotted line 284 on the panel 218.

The box is usually supplied to a user in this form, as shown in Figure 6. In an alternative method of supply though, the box can be delivered without any folds at the front such that the flat blank is only folded to enable the tab 280 to be secured to the region 284 of the panel 284.

The box is assembled to form the upwardly extending side walls by moving the front wall or panel 210 through 90 about the valley fold 212 and moving the side panel 218 through 90 about the valley fold 214.

The base panels 232 and 238 are then moved through 90 about their valley folds. Then base panels 234 and 236 are moved through 90 about their valley folds. Tape 286 is applied to a lower portion of the rear wall 220, along the join between the base panels 234 and 236 and onto a lower portion of the front wall 210 to hold the base panels together.

The front panel 252 is held by the tab 246, which extends downwardly in the plane of the front cover 252, being tucked into slot 288 extending along and just to each side of the fold line 224 of the panels 210 and 232. The top surface of the front panel 252 is held in place by means of tabs 290, which extend sideways in the plane of the front cover 252, and are tucked into slots 292 extending along and just to each side of the fold lines 212 and 214 of the panels 210 and 218, and panels 210 and 216. Thus, the front cover is held in the middle at its lower end and at either side at its upper end.

The box can now be loaded through the open top. After loading, the box is closed by the top panels 254, 260, 268 and 274 each being moved through 90 about their valley folds. The front and rear top panels 254 and 274 are first folded over and then the side top panels 260 and 268 are folded over on top. Tape 294 is applied to a top portion of the rear wall 220, along the join between the side panels and onto a top portion of the front panel 252 to lock the panels in place. The assembled box is shown in Figure 7.

To convert the box into a display tray a user inserts a finger through an opening 296 in the front panel 252 and either lifts upwardly or pulls the tab out and lifts upwardly. The opening 296 is formed directly below the tab 258. The upward movement of the finger is thus exerted on the tab 258 just below the respective lines of weakness 262 and 264 and causes detachment of the tab 258 from the panel 252. In the same manner, a user inserts a finger through an opening 298 in the rear wall 220 and lifts upwardly or pulls the tab out and lifts upwardly.

The opening 298 is formed directly below the tab 278. The upward movement of the finger is thus exerted on the tab 278 just below the respective lines of weakness 248 and 250 and causes detachment of the tab 278 from the panel 220. As the tab 258 and/or 278 is detached it may also tear away the tape 294 across the top of the box. This is enabled by the tape extending over ends of the box and being stuck to at least one of the tabs 258 or 278.

Then the majority of the cover is removed by tearing the top panels 266, 268 and 274 along their respective lines on weakness 270, 272 and 276. This does not damage the remainder of the tray and does not disturb the contents of the tray. The remaining part of the cover, comprising the front panels 252 and 254 are removed by a user pulling vertically to tear the panels 252 and 254 off along the line of weakness 244.

The display tray is then left with side walls 216 and 218, rear wall 220 and front wall 210 as shown in Figure 8.

The contents of the box are visible through a cut out portion 300 at the front of the box and possibly through the top of the box, if another is not stacked on top.

The breakaway features of the front panel 252 of the box may be additionally applied to the rear wall 220 to provide two open faces to the customer. This has a further benefit when stacking as the box has a double wall thickness extending the complete depth of the box at each corner region. Alternatively and/or additionally, the breakaway features of the front panel 252 may be applied to one or both side walls 216, 218 of the box.

Any of the boxes described may be made o f corrugated paper or plastic board or any suitable material.

Attention is directed to all papers and documents which are filed concurrently with or previous to this specification in connection with this application and which are open to public inspection with this specification, and the contents of all such papers and documents are incorporated herein by reference.

All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and/or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and/or steps are mutually exclusive.

Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.

The invention is not restricted to the details of the foregoing embodiment(s). The invention extends to any novel one, or any novel combination, of the features

disclosed in this specification (including any

accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.

Claims

1. A box comprising a display tray and a cover made from a single sheet of material, the cover being detachable from the tray by tearing occurring along at least one line of weakness, the tray and cover both including at least one layer extending along at least part of one upwardly extending wall of the box, with the inner of those layers mechanically engaging with another part of the box to inhibit movement of that inner layer inwardly into the space defined by the box.

2. A box as claimed in claim 1 in which the inner layer mechanically engages with another part of the box at at least two spaced locations.

3. A box as claimed in claim 2 in which the inner layer mechanically engages with another part of the box at at least three spaced locations.

4. A box as claimed in claim 2 or 3 in which the spaced locations include the base region.

5. A box as claimed in any of claims 2 to 4 in which the spaced locations include a side portion of the box.

6. A box as claimed in any preceding claim in which the spaced locations include an upper region.

7. A box as claimed in claim 6 in which the spaced locations are spaced upper regions.

8. A box as claimed in claim 7 in which the spaced upper regions are at opposed side regions.

9. A box as claimed in any preceding claim in which the mechanical engagement is by means of at least one tab.

10. A box as claimed in claim 9 in which the inner layer includes a tab arrange to engage with a slot.

11. A box as claimed in claim 10 in which the inner layer is part of the cover.

12. A box as claimed in any preceding claim in which the inner layer includes a fold.

13. A box as claimed in claim 12 in which the fold is a 180 fold.

14. A box as claimed in claim 12 or 13 when dependent upon claim 9 in which the tab is at an opposed edge to the fold.

15. A box as claimed in claim 9 or any claim when dependent upon claim 9 in which the inner layer includes two further tabs, each arranged to engage with a slot at a respective spaced location.

16. A box as claimed in claim 15 in which the tabs are located on opposing sides of the inner layer.

17. A box as claimed in any preceding claim including at least one opening in the box adjacent to a line of weakness whereby, in use, an operative may engage with a layer inwardly of the opening to push the inner layer inwards and thereby detach the parts at that line of weakness.

18. A box as claimed in claim 17 including two such holes in the box spaced from each other.

19. A box as claimed in claim 18 in which the two holes are in the same upwardly extending layer.

20. A box as claimed in any of claims 16 to 19 in which the line of weakness is in the region of the base of the box.

21. A box as claimed in any of claims 16 to 20 in which the line of weakness is in the region of the mechanical engagement.

22. A box as claimed in any of claims 16 to 21 which at least one opening is in the display tray.

23. A box as claimed in any of claims 16 to 22 in which an operative is required to push through openings in two layers to engage a layer inwards of the opening.

24. A box as claimed in any preceding claim in which the inner layer is retained in position at at least one edge.

25. A box as claimed in claim 22 in which the inner layer is retained in position at at least two edges.

26. A box as claimed in claim 25 in which the box is maintained in position at edges that are adjacent to each other.

27. A box as claimed in any of claims 24 to 26 at which at least one edge of the inner layer is a free edge unconnected to other parts of the box.

28. A box as claimed in claim 27 in which at least two edges of the inner layer are free edges unconnected to other parts of the box.

29. A box as claimed in claim 28 in which the two edges of the inner layer that are free edges are adjacent edges.

30. A box as claimed in any preceding claim including at least two edges extending at least part of the whole depth of the box at at least part of one upwardly extending wall.

31. A box as claimed in claim 30 including at least two layers extending the whole depth of the box at at least part of one upwardly extending wall.

32. A box as claimed in either of claims 30 or 31 including at least three layers extending at least part of the depth of the box at at least one upwardly extending wall.

33. A box as claimed in claim 32 including at least three layers extending the whole depth of the box at at least one upwardly extending wall.

34. A box as claimed in any preceding claim including at least two different walls extending along at least part of the upwards extent with each of those walls having any of the hereinbefore described features.

35. A box as claimed in claim 34 in which the two different walls are opposing walls.

36. A box as claimed in claim 35 in which the two walls are side walls.

37. A box as claimed in any preceding claim in which, when the cover is detached from the tray, the tray has at least one wall having at least two layers extending the complete depth of the wall along at least part of the extent of the wall.

38. A box as claimed in any preceding claim in which, the when the cover is detached from the tray, the tray presents clean die-cut edges.

39. A box as claimed in any preceding claim in which, at least part of the cover is arranged to be removed by lifting the cover upwardly in a generally linear direction.

40. A box as claimed in claim 39 in which at least part of the cover is arranged to be removed or detached or both by lifting the cover in a generally upwardly extending direction.

41. A box as substantially as herein described with reference to, and as shown in any of Figures 1 to 3 or any of Figures 5 to 8.

42. A method of forming a box from a single flat blank to form a cover and a display tray, the method comprising folding the blank so that the tray and the cover both include at least one upwardly extending wall having two layers extending at least part of the depth of the box, the inner layer of that wall being caused to mechanically engage with another part of the box to inhibit movement of that inner layer inwardly into the space defined by the box, the blank including at least one line of weakness to enable detachment of the cover from the tray.

43. A method of forming a box from a single flat blank substantially as herein described with reference to, and as shown in any of Figures 1 to 4 or any of Figures 5 to 9.

44. A method of forming a box as claimed in either of claims 42 or 43 in which the box is as claimed in any of claims 1 to 41.

45. A flat blank of material including fold lines and at least one line of weakness, the blank being foldable to form a box comprising a display tray and a cover in which the cover is detachable with at least one upwardly extending wall having two layers extending at least part of the depth of that wall over at least part of the extent of that wall with the inner layer of that wall mechanically engaging with another part of the box to inhibit movement of that wall inwardly into the space defined by the box.

46. A flat blank of material substantially as herein described with reference to, and as shown in any of Figures 1 to 4 or 5 to 9.

47. A flat blank of material arranged to be formed into a box as claimed in any of claims 1 to 41.

48. A flat blank of material arranged to be formed into a box by a method as claimed in any of claims 42 to 44.

49. A box formed from a single piece of material, the box comprising a detachable cover and display tray, the box including at least two layers extending the complete depth of at least one upwardly extending wall over at least part of the extent of that wall.

50. A box as claimed in claim 49 in which at least one layer extends the complete depth of the wall over the complete extent of the wall.

51. A box as claimed in claim 49 or 50 in which at least two layers that extend the complete length of the wall also extend the complete width of the wall at at least one location.

52. A box as claimed in claim 51 in which at least two layers that extend the complete depth of the wall also extend the complete width of the wall at at least one location at the same location.

53. A box as claimed in claim 52 in which the complete width over which two layers extend comprises the upper region of that wall.

54. A box as claimed in any of claims 49 to 53 which is arranged to leave a display tray with at least one wall having at least two layers extending the complete depth of the wall over at least part of the extent of that wall when the cover is removed.

55. A box as claimed in any of claims 49 to 54 including at least two upwardly extending walls each having any of the features referred to.

56. A box as claimed in claim 55 in which those walls are opposed walls.

57. A stack of boxes when the boxes are as claimed in any of claims 49 to 56.

58. A stack of display trays as claimed in any of claims 49 to 56 with the cover detached from those display trays.

59. A method of making a box from a flat single piece of material comprising folding the material to form a box having a display tray and a detachable cover, the folds forming a box having at least one upwardly extending wall having at least two layers extending the complete depth of the box over at least part of the extent of that wall.

60. A method of making a box when the box is as claimed in any of claims 49 to 56.

61. A flat blank of material provided with folds whereby, when the blank is folded, a box comprising a detachable cover and display tray is provided with at least one upwardly extending wall having two layers extending the complete depth of the wall over at least part of the extent of that wall.

62. A flat blank as claimed in claim 61 provided with folds whereby, when the blank is folded, a box as claimed in any of claims 49 to 56 is provided.

63. A box formed from a single piece of material comprising a display tray and a detachable cover, at least part of the cover being arranged to be detached from the display tray by pulling a layer to cause detachment along at least one line of weakness.

64. A box as claimed in claim 63 in which the layer that is pulled is arranged to have at least one line of weakness.

65. A box as claimed in claim 63 or 64 in which the layer that is pulled is an upwardly extending layer.

66. A box as claimed in any of claims 63 to 65 in which the layer that is pulled is arranged to be pulled in the region of the line of weakness.

67. A box as claimed in claim 66 in which the line of weakness is located at a lower region of the box.

68. A box as claimed in any of claims 63 to 67 in which the layer that is pulled is arranged to be pulled upwardly.

69. A method of detaching at least part of a cover from a box formed from a single piece of material comprising pulling at least one layer to cause detachment of the cover along a line of weakness.

70. A method as claimed in claim 69 comprising pulling the layer in the plane of that layer.

71 a method as claimed in claim 69 or 70 comprising pulling the layer upwardly.

72. A method as claimed in any of claims 69 to 71 comprising detaching a cover from the box when the box is as claimed in any of claims 63 to 68.

73. A flat blank arranged to be formed into a box comprising a detachable cover and display tray, with at least part of the cover being arranged to be detached by pulling to cause detachment along at least one line of weakness in the flat blank.

74. A flat blank for making into a box when the box is as claimed in any of claims 63 to 68.