CN1688485A

CN1688485A - Folding carton and blank for making folding carton

Info

Publication number: CN1688485A
Application number: CNA038239876A
Authority: CN
Inventors: M·P·罗南
Original assignee: TONGDA COMMERCIAL GROUP INTERNATIONAL CO
Current assignee: TONGDA COMMERCIAL GROUP INTERNATIONAL CO; Access Business Group International LLC
Priority date: 2002-08-13
Filing date: 2003-08-13
Publication date: 2005-10-26
Also published as: JP2005535529A; US20040031843A1; WO2004014746B1; WO2004014746A1; KR20050048599A; AU2003256397A1

Abstract

A folding carton has a series of panels defining an internal space. A top closure flap (26) is foldable over the top of the internal space. A top locking tab (38) is connected to the top closure flap (26). The top locking tab (38) is folded at angle for insertion into the internal space. A knob lock (4, 6) extends from either side of the top locking tab (38). The knob locks (4, 6) extend sufficiently from the top locking tab (38) so that they form a frictional fit with the two of the side panels (11, 13) defining the internal space. A blank to form such a folding carton is also shown.

Description

The slab of folding box and manufacturing folding box

The present invention requires to enjoy the U.S. Provisional Patent Application No.60/403 that is entitled as " the spherical spacer of collapsible cardboard case " that submitted on August 13rd, 2002,132 preceence.

Technical field

The present invention relates to a kind of carboard, particularly, relate to the closure member of folding box.

Background technology

The folded sheet carton is known in the packing technique field.Carboard is made by the plane slab usually, forms fold line from the precut also prescoring of cardboard and produces slab.The slab of carboard comprises that several constitute the panel of carton side.Such as, the slab of rectangular carton will have four main panels, constitute four faces of carboard.Cover plate is connected the top and the bottom of slab usually, so that can open and close formed carboard.In addition, can also be provided with minor flaps or dust flap in the top and the bottom of slab.Minor flaps helps to prevent that dust and chip from entering carboard.

But carboard preferably includes the structure of securing cover plate in make position.Traditional carboard generally includes the slit locks on the cover plate.Slit locks is usually included in the slit that carboard cover plate fold line cuts out.In order to make the slit locks can proper handling, each end of carboard also must be provided with minor flaps except cover plate.At first minor flaps is rolled over the opening that covers carboard downwards.Fold into cover plate on the minor flaps then and fill in the carboard.Slit locks and minor flaps are interlocked and cover plate are fixed on make position.This enclosure method has sizable problem.Often make slit be locked in the cover plate and ftracture such as, the repetition opening and closing of carboard, thereby tear cover plate and reduce the validity of closing means.And it is attractive in appearance inadequately that slit locks is thought, especially at cosmetic field, because can see exposed edge along fold line.

Perhaps, traditional carboard can be fixed on make position by cover plate is engaged with the internal friction of carboard.Utilize this method, by the frictional engagement between cover plate and the carboard sidewall, cover plate can remain on make position.In order to guarantee this frictional engagement force, the necessary very accurately width of control cover plate.If cover plate is too wide, can not be assembled in the opening of carboard, carboard can not be closed.Adopting wrapping machine to close the carboard with this frictional engagement cover plate may be very difficult.And after the use, the edge of cover plate just begins wearing and tearing, influences the cooperation of cover plate in carboard.If cover plate is too narrow, can not realize frictional engagement, thereby cover plate can only place the carboard opening loosely.

Summary of the invention

The problems referred to above can solve by the present invention, and the present invention proposes a kind of folding box, and the cover plate of carboard comprises several outshots or spherical spacer, help to make cover plate to remain on make position.Spherical spacer makes between cover plate and the carboard sidewall and produces frictional engagement from the outstanding enough distances of cover plate.Frictional engagement helps to make cover plate to remain on make position.

In a preferred embodiment, cover plate slightly is narrower than carboard, therefore can freely be assembled in the carboard.Spherical spacer extends enough distances from cover plate, so the combined width of cover plate and spherical spacer surpasses the width of carboard.When for the first time closing cover plate, the mutual action of spherical spacer and carboard sidewall makes spherical spacer be orthogonal to the cover plate bending, thereby is consistent with the width of carboard with the width " adjustment " of cover plate.Because width is set by interference, so produce frictional engagement between cover plate and sidewall.

In another preferred embodiment, each outstanding spherical spacer of the left and right sides of upper cover plate.Each spherical spacer is given prominence to enough distances to extend beyond cooresponding carboard sidewall from cover plate.The result is that when cover plate was closed for the first time, two spherical spacers all engaged with sidewall and bending orthogonally.These both sides at cover plate form frictional engagement, have greatly improved the confining force of cover plate.

In another preferred embodiment, carboard comprises minor flaps or the dust flap that is arranged in below the cover plate.The position of the spherical spacer of cover plate is arranged to, when using minor flaps, the vertical bending part of spherical spacer be stuck in minor flaps below, cover plate further is fixed on make position.Mutual action between spherical spacer and the minor flaps makes cover plate produce the significant sound when opening and closing.

The present invention compares with the collapsible cardboard case of prior art has significant preceence.This dual fastening method utilizes frictional engagement and locking part, can reduce the accuracy rate that forms carboard.More specifically, because whole cover plate does not engage (being spherical spacer frictional engagement with it) with sidewall friction, so the cutting of carboard and fold and definitely accurately just can use wrapping machine correctly to close this carboard.This is that spherical spacer is out of shape where necessary and has formed frictional engagement because when cover plate inserts carboard for the first time.Therefore, width that needn't the accuracy control cover plate during cutting, carton walls will be determined the width of cover plate.And the mutual action of spherical spacer and dust flap has formed firm sealing, will produce the significant sound when opening and closing cover plate.In addition, owing to there is not slit locks, this folding box is not only attractive in appearance, and unlikely ftractures.

By the reference detailed description of the accompanying drawings, be familiar with and understand these and other purpose, advantage and feature of the present invention with being more prone to.

Description of drawings

Fig. 1 is the transparent view of carboard according to a preferred embodiment of the invention;

Fig. 2 is the top plan view of carton blank according to a preferred embodiment of the invention;

Fig. 3 is the top plan view of lamina tecti;

Fig. 4 is that the carboard of closed state is looked section drawing along the partial left of 4-4 section;

Fig. 5 is the cross-sectional top view of the carboard of closed state along the 5-5 section; With

Fig. 6 is the top plan view of the optional embodiment of lamina tecti.

The specific embodiment

Fig. 1 shows collapsible cardboard case 1 according to a preferred embodiment of the invention.Shown in carboard 1 be the carboard that is substantially rectangle, be used for containing pipe dress cosmetics or other similar article.As clearly shown in Figure 2, carboard 1 generally comprises

several panels

11,12,13 and 14 that constitute carboard 1 sidewall, and the dust flap 27,28,29,30, lamina tecti 26 and the bottom closure flap 25 that constitute carboard 1 T﹠B.Lamina tecti 26 comprises a pair of outward extending spherical spacer 4,6.The sidewall and the dust flap mutual action of spherical spacer 4,6 and carboard make cover plate remain on make position.Be introduced though the present invention is the rectangular carton in conjunction with containing pipe dress cosmetics or other similar articles, the present invention also can be applicable to the almost carboard of virtually any size, shape or structure well, and can hold almost any article.

As mentioned above, carboard 1 is rectangle substantially, forms the inner space 52 that holds one or more products.In manufacturing process, preferably that carton blank 10 is folding and be glued together to form carboard 1, open lamina tecti 26 and allow inner space 52 that product is inserted carboard 1.The product (not shown) inserts and lamina tecti 26 closures generally occur in traditional packaging production line.During use, the lamina tecti 26 of carboard can repeated open and is closed, repeatedly to take the product that is contained in the carboard 1.In general, the bottom closure flap 25 of carboard 1 remains on make position.Yet, can open and close in some applications, therefore spherical spacer can be set as required.

In a preferred embodiment,

panel

11,12,13 and 14 is arranged to rectangle, and keeps this shape by adhesive plate 15.Adhesive plate 15 is plate 14 extensions from behind preferably, with the inside face of adhesive to right panel 11.

Introduce carboard 1 in further detail referring now to accompanying drawing 2 and 3, these accompanying drawings show carton blank 10, can be used to make the carboard 1 of preferred embodiment.Fig. 2 shows the front surface 80 of the slab 10 that is used to form carboard 1.The rear surface is the mirror image of front surface basically, therefore will no longer be introduced.As shown in the figure, the carboard 1 paperboard blank 10 of handy monolithic is made, can be with traditional method folded blank 10 to form carboard 1.In this preferred embodiment, paperboard blank is made with traditional paper board material, and its thickness is approximately 0.010 to 0.024 inch.Concrete cal(l)iper can be different according to practical use, and it depends primarily on the carboard characteristic of requirement.

Fig. 2 shows the basic structure of carton blank.Slab 10 has top 16 and bottom 17.Slab 10 also has right panel 11, front panel 12, left panel 13, rear panel 14 and adhesive plate 15.Right panel 11 links to each other with front panel 12 along fold line 21.Front panel 12 links to each other with left panel 13 along fold line 22.Left panel 13 links to each other with rear panel 14 along fold line 23.Rear panel 14 links to each other with adhesive plate 15 along fold line 24.The size of each panel, shape and structure can be according to the needs of concrete application and are different.

And, as mentioned above, also have the bottom closure flap 25 and the lamina tecti 26 on enclosed cartons 1 bottom and top.Bottom closure flap 25 links to each other with the bottom 17 of front panel 12 along fold line 32, and lamina tecti 26 links to each other with the top 16 of rear panel 14 along fold line 31.In addition, bottom closure flap 25 comprises the bottom locking plate 37 that forms by fold line 39.Similarly, lamina tecti 26 comprises the top locking plate 38 that forms by fold line 40.Bottom closure flap 25 and lamina tecti 26 can be selected to be connected on the different panels.

In this preferred embodiment, be provided with four dust flap 27,28,29 and 30.Before closing cover plate 25 and 26, dust flap 27,28,29 and 30 is closed to the top and the bottom of carboard 1.Top dust flap 29 and 30 is extended from the top 16 of right panel 11 and left panel 13 respectively.Top dust flap 29 links to each other with right panel 11 along fold line 33.Top dust flap 30 links to each other with left panel 13 along fold line 35.Similarly, bottom dust flap 27 and 28 is extended from the bottom 17 of right panel 11 and left panel 13 respectively.Bottom dust flap 27 links to each other with right panel 11 along fold line 34, and bottom dust flap 28 links to each other with left panel 13 along fold line 36.

Can see in Fig. 2, be clear that more that spherical spacer 4,6 is outstanding from the left side 50 and the right side 52 of top locking plate 38 respectively at Fig. 3.Perhaps, left cover side 54 and the right cover plate side 56 from bottom locking plate 37 is outstanding respectively for spherical spacer.Though the present invention is introduced with reference to spherical spacer 4,6, will be appreciated that if spherical spacer is arranged on bottom locking plate 37, its function and spherical spacer 4,6 are similar.The structure of the spherical spacer of bottom locking plate 37 is identical with the structure of spherical spacer 4,6 on the top locking plate 38 basically.Perhaps, bottom locking plate 37 can comprise slit locks, closes as shown in Figure 2 or by traditional frictional engagement.

Each spherical spacer 4,6 preferably from the outstanding enough distances of the side of top locking plate 38, can produce frictional engagement when top locking plate 38 inserts carboard 1.In a preferred embodiment, spherical spacer 4,6 is the semicircular protrusions of extending from top locking plate 38 both sides substantially.In a preferred embodiment, each spherical spacer 4,6 just the radius of the teat of top locking plate 38 between 1/32 inch to 1/64 inch.In this embodiment, the bottom-to-top-height of spherical spacer 4,6 equals the diameter of spherical spacer 4,6 haply.Spherical spacer 4,6 and the height of sidewall contact position will influence the confining force that engages with sidewall friction and produce usually.Usually, will have the bigger face area that engages with sidewall, thereby produce bigger confining force usually at the bigger spherical spacer of contact position height.So higher spherical spacer can be used for bigger carboard, make lamina tecti 26 produce bigger confining force.Definite size, shape, number and the position of spherical spacer can be according to different purposes and difference, with the required strength of control opening and closing carboard.Such as, spherical spacer 4,6 can be rectangle 70 (see figure 6)s substantially, or has a straight flange and round edge 72 (see figure 6)s, perhaps has one or more hypotenuses.

In a preferred embodiment, spherical spacer 4,6 can be arranged to and dust flap 29,30 mutual actions, makes cover plate can send the sound that can hear when opening and closing.Mutual action between spherical spacer 4,6 and the dust flap 29,30 can produce extra confining force and sense of touch indication when making 38 insertions of top locking plate and taking-up carboard 1.Beyond spherical spacer 4,6 preferably extended to the sidewall width of carboard 1 from top locking plate 38, when closing cover plate for the first time, spherical spacer 4,6 was because the bending (below will introduce in further detail) backward with the mutual action of sidewall like this.Show that as Figure 4 and 5 are clear spherical spacer 4,6 is arranged on the top locking plate 38, therefore when top locking plate 38 inserts carboard 1 fully, spherical spacer 4,6 be positioned at top dust flap 29,30 below.The bending part of each spherical spacer 4,6 enough distances that extends back when opening and closing carboard 1, can be stuck in corresponding dust flap 29,30.

Below with reference to the spherical spacer 4 that is connected top locking plate 38 left sides 50, introduce the working process of spherical spacer 4,6 in further detail.Will be appreciated that the spherical spacer 6 on locking plate right side, top 52 is its mirror image basically.When carboard 1 began to take shape, spherical spacer 4,6 and top locking plate 38 extended along common plane, because carboard is to make with plane slab 10 at first.When lamina tecti 26 inserted carboard 1 for the first time, spherical spacer 4,6 certain position before lamina tecti 26 is closed fully engaged with the upper limb of sidewall.When spherical spacer 4,6 with after the sidewall upper limb engages, further insert and cause spherical spacer 4,6 distortion, lamina tecti 26 can be closed fully.More specifically, the mutual action between sidewall and the spherical spacer makes 4,6 distortion of spherical spacer, is substantially equal to sidewall width until the overall width of lamina tecti 26 (comprising spherical spacer).Such as, in this preferred embodiment, make spherical spacer 4 roughly bend backward at spacer and sidewall 11 intersection point places.The result is, spherical spacer 4 bends to L shaped basically, and extend along the inside face of right panel 11 its outside.Thereby between spherical spacer 4 and right panel 11, produce frictional engagement.And the bending backward of spherical spacer 4 makes and produces interference fit between the bending part of spherical spacer 4 and the cooresponding dust flap.When opening and closing lamina tecti 26, spherical spacer 4,6 and sidewall produce frictional engagement, produce interference fit with top dust flap 29,30.When the user wants to open carboard 1, upwards spur lamina tecti 26 with enough power and overcome friction force between cover plate 26 and the sidewall, and make spherical spacer 4,6 by top dust flap 29,30.When spherical spacer 4,6 during, the discernible sound of introducing previously will be sent by dust flap 29,30.Because spherical spacer is out of shape by the mutual action with sidewall, so for any given carboard, the overall width of cover plate (comprising spherical spacer) is to be determined by the sidewall of carboard.Even this means the width difference of each carboard, but the overall width of cover plate can automatic compensation, corresponding to sidewall width and form frictional engagement.

Carboard 1 is normally made with conventional art and equipment.As mentioned above, carboard 1 the most handy thickness is that 0.010 to 0.024 inch conventional cardboard material is made.Yet definite material and thickness thereof can be different according to concrete the application.Slab 10 the most handy traditional angle benders come bending.Left panel 13 and right panel 11 upwards bend 90 degree along fold line 22 and 21.Rear panel 14 is 11 direction bending, 90 degree along fold line 23 towards right panel.Adhesive plate 15 is along fold line 24 bending downwards 90 degree.Adhesive plate 15 is placed in the right panel 11.

With traditional adhesives such as water-based adhesive, solvent-based adhesive or hotmelt adhesive plate 15 is fixed on the right panel 11.Preferably apply adhesives along the straight line of adhesive plate 15 whole length basically.From prior art as can be known, employed adhesives is applied on adhesive plate 15, right panel 11 or both.

After right panel 11 and adhesive plate 15 are tightly connected, dust flap 28 and 30 respectively along fold line 36 and 35 towards right panel 11 bendings 90 degree.Dust flap 27 and 29 is 13 bendings, 90 degree along fold line 34 towards left panel respectively.Bottom closure flap 25 upwards bends 90 degree along fold line 32, and lamina tecti 26 is along fold line 31 bending downwards 90 degree.The locking plate 37 of bottom closure flap 25 is 14 bendings, 90 degree along fold line 39 towards rear panel.

The locking plate 37 of bottom closure flap 25 is inserted carboard 1, so the front surface 80 of locking plate 37 contacts with the rear surface of rear panel 14.If spherical spacer is arranged on bottom locking plate 37, exert pressure until spherical spacer distortion to bottom locking plate 37, engage with carboard 1 internal friction.When closing the bottom locking plate, when spherical spacer will send the discernible sound by dust flap 27,28.In this state, the carboard 1 of can easily needed contents being packed into.

After filling carboard 1, close the top of carboard 1.The top locking plate 38 of lamina tecti 26 is 12 bendings, 90 degree along fold line 40 towards front panel equally.The top locking plate 38 of lamina tecti 26 is folded in the front panel 12, so the front surface 80 of top locking plate 38 contacts with the rear surface of front panel 12.Exert pressure to top locking plate 38 and to engage with carboard 1 internal friction until 4,6 distortion of spherical spacer.When closing top locking plate 38,, be locked in the carboard 1 to remind user top locking plate 38 when spherical spacer 4,6 will send the discernible sound during by dust flap 29,30.

Open carboard 1, can upwards spur lamina tecti 26 until top locking plate 38 is shifted out from carboard 1.When upwards spurring lamina tecti 26, spherical spacer 4,6 will and send the discernible sound by dust flap 29,30.Again enclosed cartons 1, can as previously described top locking plate 38 be turned back in the carboard 1.This process that shifts out and insert top locking plate 38 can be repeated as required by the user.

Be introduction above to preferred embodiment.Under the situation of the spirit and scope of the invention that does not break away from the claims qualification, various modifications and changes may be made, and claims should make an explanation according to the patent law principle that comprises equivalence principle.Any with singulative such as not being considered to only limit to the odd number object with the object in the claim of " one ", " this " or " described " expression.

Claims

(according to the modification of the 19th of treaty)

1. carboard comprises:

Be used for forming first panel of inner space, second panel, the 3rd panel and fourth face plate, described first panel and described second panel are adjacent with described fourth face plate, described second panel and described first panel are adjacent with described the 3rd panel, described the 3rd panel and described second panel are adjacent with described fourth face plate, and described fourth face plate and described the 3rd panel are adjacent with described first panel, described first panel is substantially parallel with described the 3rd panel, described second panel is substantially parallel with described fourth face plate, and described inner space has top seal end and base seal end;

Lamina tecti is connected described the 3rd panel, and is collapsible into described top seal end;

The top locking plate is connected described lamina tecti, after described top locking plate bends at a certain angle, can insert between described first panel and described the 3rd panel, and described top locking plate has the first cover plate side and the second cover plate side; With

The semi-round first spherical spacer, extend enough distances from the described first cover plate side of described top locking plate, can form frictional engagement with described first panel, the described semi-round first spherical spacer is convenient to described top locking plate and is inserted and shift out, when described lamina tecti is closed fully, the described first spherical spacer deforms, with the described first panel frictional engagement.

2. carboard according to claim 1, also comprise the semi-round second spherical spacer that extends enough distances from the described second cover plate side, can form frictional engagement with described the 3rd panel, described spherical spacer is convenient to described top locking plate and is inserted and shift out, when described lamina tecti is closed fully, the described second spherical spacer deforms, with described the 3rd panel frictional engagement.

3. carboard according to claim 2, it is characterized in that, the described first spherical spacer has the first spherical spacer outer rim, the described second spherical spacer has the second spherical spacer outer rim, and the distance from the described first spherical spacer outer rim to the described second spherical spacer outer rim is greater than the distance of described first panel to described the 3rd panel.

4. cancellation

5. carboard according to claim 4 is characterized in that, the described first spherical spacer deformable makes at least a portion of the described first spherical spacer be orthogonal to described top locking plate.

6. carboard according to claim 5 is characterized in that, the described second spherical spacer deformable makes at least a portion of the described second spherical spacer be orthogonal to described top locking plate.

7.

8. carboard according to claim 7 is characterized in that, the radius of the described first spherical spacer and the described second spherical spacer is between about 1/32 inch to about 1/64 inch.

9. carboard according to claim 8 is characterized in that, the height of the described first spherical spacer and the described second spherical spacer is greater than described radius.

10. monolithic slab that is used for forming the collapsible cardboard of carboard, described monolithic slab cuts and rules, to provide:

Be connected to the rear panel of left panel collapsibly along first fold line, described left panel is connected to front panel collapsibly along second fold line, and described front panel is connected to right panel collapsibly along the 3rd fold line;

Lamina tecti is connected to described front panel collapsibly along the 4th fold line;

The top locking plate is connected to described lamina tecti collapsibly along the 5th fold line, and described top locking plate has the first top locking plate example and the second top locking plate side; With

Be connected in the first spherical spacer of the described first top locking plate side, the described first spherical spacer extends to beyond described first fold line, when the locking plate of preliminary insertion top, the described first spherical spacer and described left panel mutual action are from dynamic deformation, at least a portion leans against on the described left panel, and the shape of the described first spherical spacer is convenient to the locking plate insertion of described top and is shifted out.

11. monolithic slab according to claim 10 also comprises adhesive plate, described adhesive plate links to each other with described rear panel along the 6th fold line.

12. monolithic slab according to claim 11, also comprise the second spherical spacer that is connected in the described second top locking plate side, the described second spherical spacer extends to beyond described the 6th fold line, when preliminary insertion top locking plate arrives between described left panel and the right panel, the described second spherical spacer and described right panel mutual action are from dynamic deformation, and its at least a portion leans against on the described right panel.

13. monolithic slab according to claim 12 is characterized in that, the described first spherical spacer and the described second spherical spacer are semi-round substantially.

14. monolithic slab according to claim 13 is characterized in that, the radius of the described first spherical spacer and the described second spherical spacer is between about 1/32 inch to about 1/64 inch.

15. monolithic slab according to claim 10, it is characterized in that, described rear panel has the rear panel width, the described first spherical spacer has the first spherical spacer end, the described second spherical spacer has the second spherical spacer end, and the distance from the described first spherical spacer end to the described second spherical spacer end is greater than described rear panel width.

16. monolithic slab according to claim 15 is characterized in that, described top locking plate has top locking width and top locked lengths, and on the described top locking of major part width, described top locked lengths is basically less than described rear panel width.

17. monolithic slab according to claim 16 also comprises adhesive plate, described adhesive plate links to each other with described rear panel along the 6th fold line.

18. monolithic slab according to claim 17, second dust flap that also comprises first dust flap that links to each other with described left panel along the 7th fold line, links to each other with described left panel along the 8th fold line, the 3rd dust flap that links to each other with described right panel along the 9th fold line and the 4th dust flap that links to each other with described right panel along the tenth fold line.

19. monolithic slab according to claim 18 also comprises the bottom closure flap that links to each other with described front panel along the 11 fold line.

20. monolithic slab according to claim 19 also comprises the bottom locking plate that links to each other with described bottom closure flap along the 12 fold line.

Claims

1. carboard comprises:

Be used for forming first panel of inner space, second panel, the 3rd panel and fourth face plate, described first panel and described second panel are adjacent with described fourth face plate, described second panel and described first panel are adjacent with described the 3rd panel, described the 3rd panel and described second panel are adjacent with described fourth face plate, and described fourth face plate and described the 3rd panel are adjacent with described first panel, described first panel is substantially parallel with described the 3rd panel, and described second panel is substantially parallel with described fourth face plate, and described inner space has top seal end and base seal end;

Lamina tecti is connected described the 3rd panel and is collapsible into described top seal end;

The first spherical spacer extends enough distances from the described first cover plate side of described top locking plate, can form frictional engagement with described first panel.

2. carboard according to claim 1 also comprises the second spherical spacer that extends enough distances from the described second cover plate side, can form frictional engagement with described the 3rd panel.

4. carboard according to claim 3, it is characterized in that, the described first spherical spacer and the described second spherical spacer are arranged to, when described top locking plate tentatively is placed between described first panel and described the 3rd panel, the described first spherical spacer deforms, and at least a portion leans against on described first panel; The described second spherical spacer deforms, and at least a portion leans against on described the 3rd panel.

5. carboard according to claim 4 is characterized in that, the described first spherical spacer distortion makes at least a portion of the described first spherical spacer be orthogonal to described top locking plate.

6. carboard according to claim 5 is characterized in that, the described second spherical spacer distortion makes at least a portion of the described second spherical spacer be orthogonal to described top locking plate.

7. carboard according to claim 6 is characterized in that, the described first spherical spacer and the described second spherical spacer are semi-round substantially.

10. monolithic slab that forms the collapsible cardboard of carboard cuts and rules described monolithic slab, to provide:

Be connected to the lamina tecti of described front panel collapsibly along the 4th fold line;

Be connected to the top locking plate of described lamina tecti collapsibly along the 5th fold line, described top locking plate has the first top locking plate side and the second top locking plate side; With

Be connected in the first spherical spacer of the described first top locking plate side, the described first spherical spacer extends to beyond described first fold line.

12. monolithic slab according to claim 11 also comprises the second spherical spacer that is fixed in the described second top locking plate side, the described second spherical spacer extends to beyond described the 6th fold line.

13. monolithic slab according to claim 12 is characterized in that, the described first spherical spacer and the described second spherical spacer are semicircle substantially.

16. monolithic slab according to claim 15 is characterized in that, described top locking plate has top locking width and top locked lengths, locks the above top locked lengths of width basically less than described rear panel width at most of top.