DE9318467U1 - Hollow body and blank for producing the hollow body - Google Patents

Description

Hollow body and cutting for the production of the hollow body

The invention relates to a hollow body according to the preamble of claim 1 and a blank for producing the hollow body according to the preamble of claim 3.

Known hollow bodies have corners between the individual side walls, the cuts from which the known hollow bodies can be made have predetermined bending points which create the corners in the finished hollow body. The material required for the cuts depends directly on the shape of the finished hollow body.

Hollow bodies made from cut pieces are usually made of cardboard or corrugated cardboard and are commonly referred to as boxes.

If objects such as cans or bottles, i.e. objects that are at least partially cylindrical, are packed in such boxes, a free space is created in the corner area of the side walls of the box between the box and the round outer surface of the object. The material required for the box is therefore higher than absolutely necessary.

In order to reduce the material required for the cuts, boxes are known from EP 0 486 860, for example, whose corners are bevelled between the side walls. The bevelled corners mean that there is less free space between the objects and the box in the corner area of this box than with a box with non-bevelled corners. However, there is still free space, because the bevelled corner can only lie tangentially on the outer wall of the objects in a line. There is also still free space. The material required for the cut is therefore still greater than is fundamentally necessary, even with this state of the art.

It is therefore an object of the invention to provide a box and a blank from which a box according to the invention

can be manufactured in which the free space between the outer wall of the objects and the inside of the box is minimized and thus the material requirement for the box is kept as low as possible.
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This object is achieved by the characterizing features of claim 1 relating to the hollow body and claim 3 relating to the blank.

The respective subclaims relate to further developments or special embodiments of the invention.

The invention makes use of the knowledge that the free space in the corner area can be avoided if the corner area of the box is provided with a radius and this radius corresponds approximately to the radius of the objects to be packed in the box.

A further finding according to the invention is that when processing the blank into a box, the process of forming the radius is made significantly easier if the blank has a reduced flexural rigidity in the area that later forms the rounded corner area of the box.

A possible embodiment of the invention is explained in more detail below using the list of reference symbols and two drawings.

Show it:
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Fig.l the cut and

Fig.2 a box made from the cut according to Fig.l

The blank 1 consists, for example, of corrugated cardboard or cardboard. The blank 1 is divided into a number of sub-areas. After folding and gluing the flat, quasi two-dimensional blank, the sub-areas result in a three-dimensional hollow body. The

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In the drawing, the partial surfaces marked with the reference number 2 are the side walls of the hollow body. The partial surfaces 3 form the rounded corner areas of the side walls in the folded hollow body. The partial surfaces 4 form the base and cover area of the finished hollow body.

A large number of bending lines 5, 6 are applied to the blank 1. The bending lines are embossed into the material of the blank. The structure of the blank material is weakened along this bending line 5,6, which means that the blank tends to bend along these bending lines 5,6 under load. The arrangement of the bending lines largely determines the shape of the box made from the blank.

In order to be able to precisely form the rounded edges of the finished hollow body, the bending stiffness of the partial surfaces 3 is reduced. In Figure 1, this is expressed by the hatched representation of the partial surfaces 3. The reduction in bending stiffness can now be achieved by adding a large number of additional bending lines within the partial surfaces 3. When the blank is folded, for example around a forming die, the partial surfaces 3 then preferably take on a curved shape.

Likewise, in the case of cuts made from so-called corrugated cardboard, the bending stiffness can be sufficiently reduced by pressing the partial surfaces 3 together. The corrugated intermediate layer of the corrugated cardboard is deformed and thus loses its stiffening function. When the cut is folded, the pressed partial surfaces 3 then preferably take on a curved shape in the desired manner.

The parts 4 of the blank 1 which, when unfolded, form the base and lid area of the box have an edge area 41 which is concavely curved. This shape means that the corner areas of the base and lid areas coincide with the rounded corner areas of the side surfaces.

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Figure 2 shows an unfolded box la. In order to make the connection between the individual parts of the box la and the individual parts of the blank 1 clearly visible in the drawing, the reference symbols used for the individual parts of the blank have been provided with additional letters:

The box la has a base area 4a and a lid area 4b with rounded corners. The side surfaces 2a merge into rounded corner areas 3a. The rounded corner areas 3a and the rounded corners of the base areas 4a and the lid areas 4b have matching radii. This results in a box with rounded corners without any protruding parts.

The radii of the corner areas of the box can be chosen so that they match the radius of the objects to be packed in the box. In the corner area of the box, the material from which the box is made rests against the objects. This means that there is no unnecessary space between the box and the object, and the material required for cutting is minimized.

According to the invention, there is a reduced material requirement compared to known box shapes even if the radii of the corner areas of the boxes do not exactly match the radii of the objects packed in the box.

In addition to the objectively verifiable advantages in terms of material savings, which must also be considered from the perspective of environmental protection, there is also a more subjective advantage in the attractive appearance of the boxes.

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List of reference symbols

1 cutting
la hollow body

2 Partial surface 2a Side surface

3 Partial area 3a Corner area

4 Partial area 4a Floor area 4b Cover area

5 Side fold line

6 Cover or bottom fold line

Claims (7)

Hollow body and cutting for:H<3rs£eJ.liing *äiii&s!HdTal body Protection claims !.Hollow body made from a blank with, the hollow body consists of
a stand area at least three side surfaces that lie in different planes and - a cover surface characterized in that the side surfaces each transition into concave curved surfaces and the concave curved surfaces are connected to two of the side surfaces each. 15 2.Hollow body according to claim 1
characterized in that the base and the lid surface have rounded corner areas.
20 3. Cutting suitable for the production of a hollow body, whereby the cut (1) consists of a sequence of partial surfaces (2,3,4), - the partial areas (2,3,4) are limited by the edge of the blank and/or by folding lines (5,6), the partial areas (2,3,4) are connected to one another via folding lines (5,6) the blank (1) has a first group of partial surfaces (2) which are intended to form the side surfaces (2a) of the hollow body, the blank has a second group of partial surfaces (3) which are each arranged between the side surfaces and which are intended to form the corner regions (3a) of the hollow body, the blank has a third group of partial surfaces (4) which are intended to form the base area (4a) or the lid area (4b) of the hollow body, - the partial surfaces (2) of the first group of partial surfaces are connected to the partial surfaces (3) of the second group of partial surfaces via mutually parallel side fold lines (5), the partial surfaces (4) of the djrijttiefi Grjippej &ngr;(|&eeacgr;";&Tgr;*&Igr;&Igr;·1 surfaces are connected to the partial surfaces (2) of the e^fft^la. Gru^p^S..von.iP(*:U*f laugh via lid or bottom folding lines (6) and the side folding lines (5) are arranged perpendicular to the lid or bottom folding lines (6), characterized in that the bending stiffness of the blank (1) in the area of partial surfaces (3) of the second group of partial surfaces is reduced. 10 4. Blank according to claim, characterized in that in order to reduce the bending stiffness, the partial surfaces (3) belonging to the second group of partial surfaces have a multiplicity of additional auxiliary folding lines (7) running parallel to the side folding lines (5). 5. Blank according to claim 3 or characterized in that - in order to reduce the bending stiffness, the partial surfaces belonging to the second group of partial surfaces (3) have a smaller wall thickness than the remaining parts of the blank (1). 6. Blank according to one of the preceding claims 3 to , characterized in that the partial surfaces belonging to the third group of partial surfaces (4) have an edge profile (41) which is concavely curved at least in partial areas. 30 7. Blank according to one of the preceding claims 3 to , characterized in that the hollow body is intended to accommodate at least partially cylindrical objects and - the width of the partial surfaces from the second group (3) of partial surfaces corresponds to approximately a quarter of the outer circumference of the objects that can be packaged in the hollow body made from the blank.