AT526582A4 - Process for producing a packaging material - Google Patents

Abstract

The invention relates to a method for producing a packaging material with at least one relief-like structural layer (1), the method comprising the following steps: (a) providing a base material (2), the base material (2) being paper, (b) plastically deforming the base material (2) with an embossing device to form the structural layer (1), the embossing device having a plurality of embossing sections (4) so that the structural layer (1) has a plurality of molding areas (3) formed by the embossing sections, the base material (2) being paper with an elongation at break in the machine direction of at least 5% and with an elongation at break in the transverse direction of at least 5%, that the deformation in step (b) takes place at a temperature of between 10°C and 40°C, and that the base material (2) has a water content of between 5% and 9% during the deformation in step (b). The invention further relates to a shipping material as such.

Description

Process for producing a packaging material

The present invention relates to a process for producing a

packaging material as well as packaging material as such.

Packaging materials are known in the art, for example those used for sending goods by post. Typically, either cardboard boxes or shipping envelopes with or without cushioning material are used here. The latter are primarily used for packaging and shipping smaller items that do not take up a large packing volume. Padded shipping envelopes typically comprise a cover made of paper material and a padding made of bubble wrap, which is made of plastic material. The cover provides privacy and stabilization, while the bubble wrap provides a good buffering effect.

without significantly increasing the volume of the packaging.

Due to efforts to reduce the amount of plastic in packaging materials, a replacement for bubble wrap would be desirable, but no materials are known to date that offer comparable properties and can still be produced in the most energy-efficient way possible. An alternative to the aforementioned shipping envelopes is the use of cardboard packaging, which is padded with crumpled paper or other plastic-free padding materials, for example. However, this greatly increases the shipping volume, which in turn has a negative impact on the energy consumption during transport, so that the positive effect of omitting the

plastic material is at least partially relativized.

It would therefore be desirable to create a process that would allow the production of plastic-free packaging materials that have similar cushioning properties to bubble wrap, but are nevertheless thin. The production should also involve the use of as little energy as possible, and in particular without any energy being used.

form of steam and/or heat.

An object of the present invention can therefore be seen in achieving this goal. In particular, an object of the present invention can be seen in creating a method for producing a packaging material which has a reduced energy consumption compared to the prior art and is plastic-free. A further object of the invention can be seen in

to create an appropriate packaging material as such.

The invention therefore relates in particular to a method for producing a packaging material which has at least one structural layer with an embossed structure. The structural layer can be used as such as a packaging material

but it can also be used in a layered composite.

The method preferably uses paper, in particular kraft paper, as the base material. In a known manner, the base material is subjected to plastic deformation in the method according to the invention. The deformation takes place in particular by means of an embossing device which has a plurality of embossing sections and is set up in such a way that the base material has a plurality of shaping areas formed by the embossing sections after deformation. Different devices can be provided to form the shaping areas, for example two embossing rollers running against each other or two corresponding embossing plates, between which the base material is introduced, subjected to pressing and thereby deformed. In particular, full contact pressing of the base material takes place in the embossing device. For this purpose, the embossing sections can be formed by a die section and a geometrically corresponding male section, with a male section being inserted into a corresponding die section and between the

The base material to be formed is arranged in both sections.

Completely unexpectedly and surprisingly, it has now been found within the scope of the present invention that a packaging material suitable for achieving the above-mentioned objectives can be achieved by plastically forming paper as the base material. The forming can be carried out essentially without external heat supply, in particular when the base material is a paper that has an elongation at break in the machine direction (MD) of at least 5% and an elongation at break in the transverse direction (CD) of at least 5%. The

Elongation at break can be determined, for example, according to ISO 1924-3:2005.

In specific embodiments of the invention, the base material may have an elongation at break of at least 8% in the machine direction and/or in the transverse direction.

exhibit.

In a preferred embodiment, the base material has in the machine direction

and/or an elongation at break of at least 9% in the transverse direction.

In the method, it is particularly provided that the plastic forming of the base material takes place at a temperature between 10°C and 40°C. The absolute water content of the base material during forming can be between 5% and 20%. In particular, the absolute water content of the base material during forming can be between 5% and 15%, in special embodiments between 5% and 12% or between 5% and 9%. An adjustment of the water content by

Spraying, misting, printing or other suitable measures are possible.

The absolute water content in % can in particular refer to % by weight in relation to the dry mass of the base material. The absolute water content can also

referred to as absolute humidity.

The method is preferably carried out in an industrial embossing device. In this, the embossing device can comprise, for example, a machine frame and a conveyor device for supplying and removing the base material. The

Base material can be provided in rolls. Optionally,

Other devices may be connected to the embossing device, for example a

Cutting station.

The process according to the invention provides, on the one hand, a plastic-free packaging material and, on the other hand, enables considerable energy savings compared to the production of conventional forming processes for paper-based materials, which usually take place at high temperatures and high

water contents.

Further advantages of the present invention may be:

- Independence from fossil fuels

- no use of raw materials from fossil sources

- reduced equipment requirements in the production plant due to elimination of the heating/steam system

- reduced capital expenditure on new equipment

- reduced footprint for new plants

- reduced energy requirements when transporting products packaged with the packaging materials according to the invention

- no paper-plastic composites and therefore easier recyclability

In connection with the present invention, "external heat supply" means in particular that no additional or intentional supply of heat takes place. The embossing device or the embossing areas typically heat up slightly during operation, but this is not considered "external heat supply" in the sense of the present invention.

is to be viewed.

In the method according to the invention, the temperature at which the forming takes place can in particular be the temperature at which the surface of the embossed areas during the

Before the forming step is carried out, the base material can be essentially flat

For example, it can be rolled goods, which in the inventive

procedure is processed,

In particular, a structural layer can be produced in which the

Base material is permanently plastically deformed.

The embossing device may comprise embossing plates so that flatbed embossing is carried out. The embossing device may alternatively comprise embossing rollers so that

rotary roller embossing is carried out.

The geometry of the embossed areas is not particularly limited. For example, they can be designed so that the embossed sections have a knob-shaped geometry, i.e. in particular a hemispherical or spherical segment-shaped geometry. However, the embossed areas can also be prismatic, truncated pyramid-shaped or

be truncated cone-shaped.

Embossed areas or shaped areas in the structural layer can be directly adjacent to each other, but plan areas can also be arranged between them, in which

in which the base material is not subjected to any deformation.

The molding areas can have a depth of between 1 mm and 20 mm, in particular between 5 mm and 20 mm. The depth is in particular the maximum dimension of the molding areas in the thickness direction of the structural layer. The molding areas can form extensions that are essentially orthogonal to the surface plane of the

structural layer.

Where applicable, the burst strength of the base material is at least 380 Pa. Where applicable, the burst strength of the base material is between 380 kPa and 1000 kPa. The burst strength can be determined, for example, in accordance with ISO 2758:2014.

If appropriate, the tensile fracture energy of the base material in the machine direction is at least 150 J/m?, in particular at least 200 J/m?, preferably at least 400 J/m?. If appropriate, the tensile fracture energy of the base material in the transverse direction is

at least 150 J/m?, in particular at least 200 J/m?, preferably at least 300 J/m?.

The tensile fracture energy of the base material in the machine direction may be between 150 J/m? and 600 J/m?. The tensile fracture energy of the base material in

Transverse direction may be between 150 J/m? and 500 J/m?.

The tensile energy absorption can be determined, for example, according to ISO 1924-3:2005.

Optionally, the tensile strength of the base material in the machine direction is at least 5.0 kN/m, in particular at least 7.0 kN/m, preferably at least 10 kN/m or at least 13 kN/m. Optionally, the tensile strength of the base material in the transverse direction is at least 3.0 kN/m, in particular at least 5.0 kN/m, preferably at least 6.0 kN/m.

The tensile strength of the base material in the machine direction may be between 5.0 kN/m and 20 kN/m. The tensile strength of the base material in

Transverse direction may be between 3.0 kN/m and 10.0 kN/m.

The tensile strength can be determined, for example, according to ISO 19243:2005.

Optionally, the tear resistance of the base material in the machine direction is at least 500 mN, in particular at least 700 mN, preferably at least 1000 mN or at least 1200 mN. Optionally, the tear resistance of the base material in the transverse direction is at least 500 mN, in particular at least 700 mN, preferably at least 1000 mN or at least 1200 mN or even at least 2000 mN. Optionally, the tear resistance of the base material in the machine direction and/or in the transverse direction is between 500 mN and 2500 mN.

The tear strength can be determined, for example, according to ISO 1974:2012.

7723

Where appropriate, the basis weight of the base material is between 50 g/m? and 180 g/m?. In particular, the basis weight of the base material is at least 80 g/m?. The basis weight can be determined, for example, in accordance with ISO 536:2012.

become.

The structural layer produced in a process according to the invention can be used as packaging material without further processing steps. However, further steps can be provided in which the structural layer

is further processed to form a packaging material.

For example, a flat layer consisting of the base material can be connected to a structural layer to form a flat layer-structural layer composite. In such a flat layer-structural layer composite, the mold areas on one side of the structural layer can be connected to the flat layer via an adhesive. Optionally provided flat areas can also be bonded to a

Plan layer can be connected.

A flat layer-structure layer composite can optionally be connected to another flat layer on the side on which the structure layer is exposed. It is also possible to connect several flat layer-structure layer composites each consisting of a flat layer and a structure layer. For example, the following layer sequences can be formed in a method according to the invention: P-S; P-S-P; P-S-P-S-P; P-S-P-S-P-S-P, where P is a flat layer and S is a

structural layer.

The adhesive for producing a planar layer-structural layer composite can be selected from one or more of the following adhesives: water-based adhesive; solvent-based adhesive; solvent-free adhesive; starch-based adhesive; protein-based adhesive; polymer dispersion adhesive; polymer solution adhesive; resin adhesive; electron beam-activatable adhesive;

Hotmelt adhesive; reactive adhesive, especially 2-component reactive adhesive.

Adhesives that require curing or solidification

no heat supply is required.

Further steps may be required to form a packaging material

such as printing, folding, cutting, bending, gluing.

In particular, the invention also relates to a packaging material that has been produced by a method according to the invention. A packaging material can consist of or comprise a structural layer. The structural layer can

in turn be made from a base material.

It can be provided that the base material is kraft paper with an elongation at break in the machine direction of at least 5% and with an elongation at break in the transverse direction of at least 5%, wherein the structural layer has a plurality of forming areas. The base material can have those properties which are in

connection with the method according to the invention.

The packaging material can be in the form of a box, a shipping bag or a

other packaging.

The invention particularly relates to a method for producing a packaging material with at least one relief-like structural layer, the method comprising the following steps:

- Providing a base material, wherein the base material is paper, in particular kraft paper,

- plastically forming the base material with an embossing device to form the structural layer, wherein the embossing device has a plurality of embossing sections, so that the structural layer has a plurality of mold areas formed by the embossing sections,

Preferably, the base material has an elongation at break in the machine direction of at least 5%, in particular at least 8%, and an elongation at break in the transverse direction of at least 5%, in particular at least 8%,

that the forming takes place at a temperature of between 10°C and 40°C

and that the base material during forming has an absolute water content of

between 5% and 20%, in particular between 5% and 9%.

Where appropriate, the bursting strength of the base material shall be at least 380 kPa or between 380 kPa and 1000 kPa.

Where appropriate, it is provided that the tensile strength of the base material in the machine direction is at least 150 J/m?*, in particular at least 200 J/m?, and that the tensile strength of the base material in the transverse direction is at least 150 J/m?,

in particular at least 200 J/m?.

Where appropriate, it is provided that the tensile strength of the base material in the machine direction is at least 5.0 kN/m, in particular at least 7.0 kN/m, and that the tensile strength of the base material in the transverse direction is at least 3.0 kN/m,

in particular at least 5.0 kN/m.

Where appropriate, it is provided that the tear resistance of the base material in the machine direction is at least 500 mN, in particular at least 700 mN, and that the tear resistance of the base material in the transverse direction is at least 500 mN,

in particular at least 700 mN.

If necessary, the base material is to be treated in the

Essentially it is flat.

If necessary, it is provided that the embossing sections are formed by a die section and a die section that can be inserted or is inserted into the die section.

Male section is formed.

Optionally, it is provided that the embossing device comprises two embossing rollers, wherein the male die sections are arranged on the first embossing roller and the female die sections on the second embossing roller, or that the embossing device comprises two embossing plates, wherein the male die sections are arranged on the first embossing plate and the

Die sections are arranged on the second embossing plate.

If necessary, the embossed sections are separated by flat sections so that adjacent forming areas of the formed base material

are separated from each other by planning areas.

Where appropriate, it is provided that the mold areas, in particular relative to the

Plan areas, have a depth of between 1 mm and 20 mm.

Where appropriate, it is provided that the shape areas have a geometry selected from the following list: spherical segment-shaped, prismatic, truncated pyramid-shaped, truncated cone-shaped, with the shape areas preferably

are spherical segment-shaped.

If necessary, it is provided that flat areas are arranged between adjacent forming areas in the machine direction and in the transverse direction of the base material.

are.

Optionally, the method comprises the following further steps: - providing a substantially planar plane layer formed from the base material, and - connecting the structural layer obtained in step to the planar layer to obtain a planar layer-structural layer composite.

If necessary, it is intended that the planar layer is connected to planar areas of the structural layer and/or that the planar layer is connected to form areas of the

If necessary, it is intended that the resulting flat layer-structure layer composite is bonded to a further flat layer and/or to a further structure layer

is connected.

If necessary, an adhesive may be used to bond layers

selected from one or more of the following: Adhesive

water-based; electron beam activated adhesive; hot melt adhesive;

Reactive adhesive, especially 2-component reactive adhesive.

If necessary, it is intended that an envelope, in particular an envelope, is made from the structural layer and/or the flat layer-structural layer composite

or a shipping package.

The invention also relates in particular to a packaging material, in particular obtained in a process with one or more of the features mentioned here, comprising or consisting of a structural layer consisting of a base material, wherein the base material is kraft paper with an elongation at break in the machine direction of at least 5% and with an elongation at break in the transverse direction of at least 5%, wherein the structural layer has a plurality of embossed

shape areas.

Where appropriate, adjacent mold areas may be separated by plan areas

are separated from each other.

Further features of the invention emerge from the patent claims, the figures

as well as from the description of the embodiment.

The invention is explained in detail below using an exemplary embodiment. The exemplary embodiment serves only to illustrate advantageous aspects of the invention and is intended to

Do not restrict the scope of protection.

Show it:

Fig. 1 is an illustration of a forming step according to an embodiment of a method according to the invention;

Fig. 2 is a schematic detailed view of a structural layer obtained by a method according to the invention;

Fig. 3 is a schematic representation of a portion of the packaging material of Fig. 2; and

Fig. 4 is a schematic detailed view of a

Process obtained flat layer-structure layer composite.

Unless otherwise stated, the figures show the following features: structural layer 1, base material 2, mold area 3, embossing section 4, die section 5, male die section 6, flat section 7, embossing roller 8, first embossing roller 8', second embossing roller 8". Flat area 9, depth 10, machine direction 11, flat layer 12, flat layer-structural layer composite 13, adhesive area 14, width 15, transverse direction 16.

Fig. 1 shows an illustration of a forming step according to an embodiment of a method according to the invention. The flat base material 2 was introduced into an embossing device and embossed using two embossing rollers 8. The embossing rollers 8 are each equipped with a plurality of embossing sections 4, the first embossing roller 8' having die sections 5 and the second embossing roller 8" having male die sections 6. Flat sections 7 are arranged between the embossing sections 4, within which no forming or embossing of the base material 2 takes place.

he follows.

The transformation thus created a structural layer 1, which corresponds to the

Embossing sections 4 on the embossing rollers 8 has forming sections 3.

The forming in this process took place at a temperature of about 33°C (average surface temperature of the embossing rollers 8) and the base material 2

had a water content of about 6% of the dry matter.

In this embodiment, six base materials with different property profiles were compared, which are given in the following tables 1-6. Tables 1-5 show base materials according to the invention and Table 6

shows a comparison base material which is not according to the invention.

Table 1: Properties of the first base material made of unbleached pulp

Property Value determined according to Grammage [g/m?] 70 ISO 536:2012 Elongation at break MD [%] 11 ISO 1924-3:2005 Elongation at break CD [%] 10 ISO 1924-3:2005 Bursting strength [kPa] 513 ISO 2758:2014 Tensile strength MD [J/m?] 420 ISO 1924-3:2005 Tensile strength CD [J/m?] 245 ISO 1924-3:2005 Tensile strength MD [kN/m] 7.8 ISO 1924-3:2005 Tensile strength CD [kN/m] 3.3 ISO 1924-3:2005 Tear resistance MD [mN] 760 ISO 1974:2012 Tear resistance CD [mN] 1340 ISO 1974:2012

Table 2: Properties of the second base material made of unbleached pulp

Property Value determined according to Grammage [g/m?] 70 ISO 536:2012 Elongation at break MD [%] 5.8 ISO 1924-3:2005 Elongation at break CD [%] 7.4 ISO 1924-3:2005 Bursting strength [kPa] 380 ISO 2758:2014 Tensile strength MD [J/m?] 200 ISO 1924-3:2005 Tensile strength CD [J/m?] 200 ISO 1924-3:2005 Tensile strength MD [kN/m] 5.6 ISO 1924-3:2005 Tensile strength CD [kN/m] 4.06 ISO 1924-3:2005 Tear resistance MD [mN] 735 ISO 1974:2012 Tear resistance CD [mN] 805 ISO 1974:2012

Table 3: Properties of the third base material made of unbleached pulp

Property Value determined by Grammage [g/m?] 130 ISO 536:2012 Elongation at break MD [%] 12.5 ISO 1924-3:2005 Elongation at break CD [%] 9.4 ISO 1924-3:2005 Bursting strength [kPa] 790 ISO 2758:2014 Tensile strength at break MD [J/m?] 890 ISO 1924-3:2005

Tensile strength CD [J/m?] 400 ISO 1924-3:2005 Tensile strength MD [kN/m] 16.2 ISO 1924-3:2005 Tensile strength CD [kN/m] 6.5 ISO 1924-3:2005 Tear resistance MD [mN] 1600 ISO 1974:2012 Tear resistance CD [mN] 2600 ISO 1974:2012

Table 4: Properties of the fourth base material made of bleached pulp

Property Value determined according to Grammage [g/m?] 70 ISO 536:2012 Elongation at break MD [%] 5.8 ISO 1924-3:2005 Elongation at break CD [%] 8.6 ISO 1924-3:2005 Bursting strength [kPa] 410 ISO 2758:2014 Tensile strength MD [J/m?] 180 ISO 1924-3:2005 Tensile strength CD [J/m?] 225 ISO 1924-3:2005 Tensile strength MD [kN/m] 5.4 ISO 1924-3:2005 Tensile strength CD [kN/m] 3.8 ISO 1924-3:2005 Tear resistance MD [mN] 980 ISO 1974:2012 Tear resistance CD [mN] 1120 ISO 1974:2012

Table 5: Properties of the fifth base material made of bleached pulp

Property Value determined according to Grammage [g/m?] 120 ISO 536:2012 Elongation at break MD [%] 5.8 ISO 1924-3:2005 Elongation at break CD [%] 8.3 ISO 1924-3:2005 Bursting strength [kPa] 675 ISO 2758:2014 Tensile strength MD [J/m?] 285 ISO 1924-3:2005 Tensile strength CD [J/m?] 330 ISO 1924-3:2005 Tensile strength MD [kN/m] 8.9 ISO 1924-3:2005 Tensile strength CD [kN/m] 6.2 ISO 1924-3:2005 Tear resistance MD [mN] 1860 ISO 1974:2012 Tear resistance CD [mN] 2100 ISO 1974:2012

Table 6: Properties of a comparative base material (not according to the invention)

Property Value determined according to Grammage [g/m?] 70 ISO 536:2012 Elongation at break MD [%] 2.6 ISO 1924-3:2005 Elongation at break CD [%] 7.1 ISO 1924-3:2005 Bursting strength [kPa] 350 ISO 2758:2014 Tensile strength MD [J/m?] 120 ISO 1924-3:2005 Tensile strength CD [J/m?] 200 ISO 1924-3:2005 Tensile strength MD [kN/m] 7.7 ISO 1924-3:2005 Tensile strength CD [kN/m] 4.2 ISO 1924-3:2005 Tear resistance MD [mN] 910 ISO 1974:2012 Tear resistance CD [mN] 910 ISO 1974:2012

A structural layer 1 was obtained from the base materials according to the invention, in which the base material 2 is permanently plastically deformed. The structural layer 1, which was obtained according to the embodiments, is shown schematically in detail in Fig. 2

shown.

The structural layer 1 has a plurality of mutually arranged molding areas 3, which in this embodiment are formed in the shape of a spherical segment. The width 15 of each molding area 3 is approximately 20 mm, the depth 10 approximately 10 mm. Between the molding areas 3 there are planar sections 9, in which the base material 2 is not

was plastically deformed.

As can be seen in Fig. 3, the forming areas 3 are arranged in a regular pattern which runs along the transverse direction 16 and along the machine direction 11

of the base material 2. It should be noted that the structural layer 1 is already considered as

Packaging material can be used, but other

processing steps must be provided.

The comparative base material from Table 6 did not allow sufficient plastic deformation to be used as a packaging material. In particular, tearing during the forming process and insufficient dimensional stability of the

reshaped areas were observed.

Of the base materials according to the invention, those from Tables 1 and 3 are particularly noteworthy, with the base material from Table 1 showing very good suitability for the process according to the invention and the base material from

Table 3 showed an excellent suitability for the inventive method.

Fig. 4 shows a schematic detailed view of an embodiment of a packaging material according to the invention, which is a three-layer flat layer-structure layer composite 13.

To form this flat layer-structure layer composite 13, the structure layer 1 was glued to a flat layer 12 on its top and bottom sides according to the embodiment described above. The flat layers 12 also consisted of the base material 2 and a water-free adhesive was used as the adhesive. In other embodiments, it can also be a water-based adhesive, for example a dispersion adhesive. The adhesive areas 14 are located

at the contact points between the adjacent layers.

Such a plane layer-structure layer composite 13 can be used to form a

shipping envelope or the like.

Claims (1)

Patent claims 1. A method for producing a packaging material with at least one relief-like structural layer (1), the method comprising the following steps: a. Providing a base material (2), wherein the base material (2) is paper, in particular kraft paper, b. plastically forming the base material (2) with an embossing device to form the structural layer (1), wherein the embossing device has a plurality of embossing sections (4) so that the structural layer (1) has a plurality of mold regions (3) formed by the embossing sections, characterized in that the base material (2) has an elongation at break in the machine direction of at least 5%, in particular at least 8%, and an elongation at break in the transverse direction of at least 5%, in particular at least 8%, that the forming in step (b) takes place at a temperature of between 10°C and 40°C, and that the base material (2) has an absolute water content of between 5% and 20%, in particular between 5% and 9%, during the forming in step (b). 2. Method according to claim 1, characterized in that the bursting strength of the base material (2) is at least 380 kPa or lies between 380 kPa and 1000 kPa. 3. Method according to claim 1 or 2, characterized in that the tensile breaking work of the base material (2) in the machine direction is at least 150 J/m?, in particular at least 200 J/m?, and that the tensile breaking work of the base material (2) in the transverse direction is at least 150 J/m?, in particular at least 200 J/m?. 4. Method according to one of claims 1 to 3, characterized in that the tensile strength of the base material (2) in the machine direction is at least 5.0 kN/m, in particular at least 7.0 kN/m, and that the tensile strength of the base material (2) in the transverse direction is at least 3.0 kN/m, in particular at least 5.0 kN/m. 11. 18 — 62685/GP/MB Mondi AG, Marxergasse 4A, 1030 Vienna (AT) Method according to one of claims 1 to 4, characterized in that the tear resistance of the base material (2) in the machine direction is at least 500 mN, in particular at least 700 mN, and that the tear resistance of the base material (2) in the transverse direction is at least 500 mN, in particular at least 700 mN. Method according to one of claims 1 to 5, characterized in that the base material (1) is substantially flat before the forming in step (b). Method according to one of claims 1 to 6, characterized in that the embossing sections (4) are formed by a die section (5) and a male die section (6) which can be inserted or is inserted into the die section (5). Method according to claim 7, characterized in that the embossing device comprises two embossing rollers (8), wherein the male portions (6) are arranged on the first embossing roller (8°) and the female portions (5) are arranged on the second embossing roller (8*), or that the embossing device comprises two embossing plates, wherein the male portions (6) are arranged on the first embossing plate and the female portions (5) are arranged on the second embossing plate. Method according to one of claims 1 to 8, characterized in that the embossed sections (4) are separated by flat sections (7), so that adjacent forming regions (3) of the formed base material (2) are separated from one another by flat regions (9). Method according to one of claims 1 to 9, characterized in that the mold areas (3), in particular relative to the plan areas (4), have a depth (10) of between 1 mm and 20 mm. Method according to one of claims 1 to 10, characterized in that the mold regions (3) have a geometry selected from the following list: spherical segment-shaped, prismatic, truncated pyramid-shaped, truncated cone-shaped, wherein the mold regions (3) are preferably spherical segment-shaped. 13. 14. 15. 16. 17. 18. 19 — 62685/GP/MB Mondi AG, Marxergasse 4A, 1030 Vienna (AT) Method according to one of claims 1 to 11, characterized in that flat regions (9) are arranged between adjacent forming regions (3) in the machine direction (11) and in the transverse direction of the base material (2). Method according to one of claims 1 to 12, characterized in that the method comprises the following further steps: c. providing a substantially planar planar layer (12) formed from the base material (2), and d. connecting the structural layer (1) obtained in step (b) to the planar layer (12) to obtain a planar layer-structural layer composite (13). Method according to claim 13, characterized in that the flat layer (12) is connected to flat regions (9) of the structural layer (1), and/or that the flat layer (12) is connected to shaped regions (3) of the structural layer (1). Method according to claim 13 or 14, characterized in that the planar layer-structure layer composite (13) obtained in step (d) is connected to a further planar layer (12) and/or to a further structure layer (1). Method according to one of claims 13 to 15, characterized in that an adhesive selected from one or more of the following is used to connect layers: water-based adhesive; electron beam-activatable adhesive; hot-melt adhesive; reactive adhesive, in particular 2-component reactive adhesive. Method according to one of claims 1 to 16, characterized in that an envelope, in particular an envelope or a shipping packaging, is formed from the structural layer (1) and/or from the flat layer-structural layer composite (13). Packaging material, in particular obtained in a process according to one of the Claims 1 to 17, comprising or consisting of a structural layer (1) consisting of a base material, wherein the base material (2) Kraft paper with an elongation at break in the machine direction of at least 5% and with an elongation at break in the transverse direction of at least 5%, wherein the structural layer (1) has a plurality of embossed shaped areas (3). 19. Packaging material according to claim 18, characterized in that adjacent mold regions (3) are separated from one another by flat regions (9).