AT527493B1 - Method for packaging a packaged item - Google Patents

Abstract

The invention relates to a method for packaging a packaged item (1) using a paper web (2), the method comprising the following steps: covering the packaged item surface (3) with the paper web (2), the paper web (2) projecting beyond the packaged item surface (3) on all sides; folding over those sections of the paper web (2) that project beyond the packaged item surface (3) in the direction of the packaged item side surfaces (4), thereby forming tabs (5) projecting from the packaged item (1), each comprising two paper web layers; joining the two paper web layers in the region of the tabs (5); the paper web (2) having a tensile work index of at least 0.9 J/g, and the paper web (2) having an elongation at break in the machine direction and in the transverse direction according to ISO 1924-3:2005 of at least 1.8%, preferably of at least 5%. The invention further relates to an arrangement of a paper web on a packaged item.

Description

Description

METHOD FOR PACKAGING A PACKAGED GOOD

[0001] The present invention relates to a method for packaging a packaged product and an arrangement of a paper web on a packaged product.

[0002] Various methods for packaging goods are known in the prior art. Typically, the material and type of packaging are selected depending on the specific application. A special type of packaging is used for packing stacks of boards. This is typically characterized by the fact that only the surface and sides of the goods are covered with packaging material, while at least the base of the goods remains free of packaging material.

[0003] It is known to use plastic films for this type of packaging, which can be used for other packaged goods in addition to stacked boards. Due to their material properties, plastics are particularly well-suited for this application. On the one hand, they allow for high mechanical stress with a low risk of tearing. On the other hand, they exhibit high resistance to weathering, particularly to precipitation, which is advantageous given that goods packaged in this way are often stored outdoors.

[0004] However, due to regulatory requirements, there is a growing need to reduce the use of plastics, thus increasing the need to use alternative materials for packaging purposes. Furthermore, the typically low water vapor permeability of plastics leads to the formation of waterlogging, particularly in humid environments, which promotes fungal growth, which is detrimental not only to stacked boards but also to other packaged goods.

[0005] In the prior art, in addition to pure plastic films, certain plastic-paper laminates have also been proposed for packaging stacks of boards, which can partially overcome the aforementioned problems. However, such solutions also have disadvantages, as they are complex to manufacture and usually still contain a high plastic content, making them difficult or impossible to recycle. Furthermore, these solutions usually do not allow the water vapor to escape to the outside.

[0006] An object of the present invention can be seen in overcoming the problems of the prior art and providing an improved method for packaging goods such as stacks of boards. In particular, the amount of plastic used in production should be reduced as much as possible without having to compromise on the intended use.

[0007] Consequently, the invention relates to a method for packaging a packaged item, wherein a surface of the packaged item and its side surfaces are at least partially provided or covered with a packaging.

[0008] If necessary, in such a method the surface of the packaged goods is first covered with the packaging material, wherein the packaging material has a U-projection on at least one side, preferably on all sides, of the surface.

[0009] In a further step, the excess material can be folded toward the side surfaces of the packaged goods. In particular, the packaging material is folded along the edges between the respective surface and the side surface of the packaged goods.

[0010] If the folding is performed along several edges, the remaining packaging material can form flaps, which are in particular made of two layers of packaging material. The flaps can run along edges of the packaged goods that lie between two side surfaces.

[0011] If necessary, the packaging material in the area of the flaps is also

Folded along the fold line so that the two layers are in direct or flat contact with each other.

[0012] The two layers of material can then be bonded together to form the packaging. This can be done, for example, in a flat, strip-like, or point-like manner. Finally, the tabs can be attached to the outer surface of the packaging to secure their position.

[0013] Within the scope of the present invention, it has now surprisingly been found that one or more of the objects mentioned at the outset can be achieved in particular by using a paper web with a specific property profile as the packaging material.

[0014] Preferably, the packaging material is paper or a paper web.

[0015] Particularly advantageous effects can be achieved in particular when the paper web used has a tensile breaking work index of at least 0.9 J/g and an elongation at break of at least 1.8%.

[0016] The values given are in particular the geometric means of the values in the machine direction and in the transverse direction.

[0017] In the context of the present disclosure, the term “geometric mean” refers to the geometric mean of two or more individual values, i.e. the nth root of the product of the n positive numbers considered.

[0018] In particular, the geometric mean of the n numbers x, Xz, ..., Xn with x;> 0 for all /= 1, ..., N is defined as Xgeom = X1 *X2 #44 Xn-

[0019] For example, the geometric mean of the tensile work index of the paper web is the square root of the product of the tensile work index of the paper web in the machine direction and the tensile work index of the paper web in the transverse direction.

[0020] If necessary, the paper may be coated or uncoated.

[0021] For certain applications, it may be advantageous for the paper to be at least somewhat water-resistant and/or water-repellent, particularly when the packaged goods are to be stored outdoors. This property can be achieved, for example, by a coating and/or a sizing agent and/or, more generally, by a hydrophobic agent. Optionally, the paper web has a Cobb 60 value of no more than 40.

[0022] The paper used as packaging material in the process can be tear-resistant and/or stretchable. In particular, it therefore has a high tear resistance index and/or high elongation at break. Elongation at break is defined as "strain at break" according to ISO 1924-3:2005.

[0023] The paper may also have a high wet tensile strength, which is particularly advantageous for said outdoor applications. The wet tensile strength of the paper web may be at least 5% of the dry tensile strength of the paper web. This value may also be referred to as relative wet strength.

[0024] The wet tensile strength can be determined in particular as follows:

- from a climate-controlled sample sheet of the paper, 10 strips each with a width of 15+0.1 mm are cut out for testing in the longitudinal and transverse directions

- the length of the strips must be such that they can be clamped into the tensile strength tester with a free clamping length of 10041 mm

- then the strips are placed in a water bath for 6041 minutes, weighted down with glass rods; the temperature of the distilled water must be 23+1°C

- the strips are removed from the water bath and freed from excess water by gently dabbing with a blotting paper

- the strips are clamped into the tensile strength tester with their free clamping length, with a piece of blotting paper placed under the clamps; the strips must not be pre-tensioned

- the tensile strength is measured and the arithmetic mean of the individual measurements is calculated

[0025] The dry tensile strength is determined according to ISO 1924-3:2005. In particular, strips with the same geometry and the same free clamping length are used as for the determination of the wet tensile strength.

[0026] The relative wet strength in the machine direction is the ratio of the wet tensile strength in the machine direction to the dry tensile strength in the machine direction, expressed as a percentage. The relative wet strength in the transverse direction is the ratio of the wet tensile strength in the transverse direction to the dry tensile strength in the transverse direction, expressed as a percentage.

[0027] Optionally, the paper has good slip resistance. In particular, the coefficient of friction of the paper web on the outer side is at least 0.3.

[0028] The friction coefficient can be determined in particular as follows:

- the paper is cut into double layers in 6.2 cm wide strips of variable length, with two strips each forming a sample

- the measurement is carried out using an Amontons MT Friction Tester, manufactured by TJT Teknik AB, by clamping one strip of the paired paper samples lengthwise with the mesh side facing up using a clamp; the second strip is clamped into the sled with the mesh side facing up, then the "Release Retainer" button is pressed and you wait until the buzzing sound stops; the protruding part of the now clamped paper sample is torn off and the sled is released from the magnetic holder by pressing the "Open Sled" button; the sled is placed in the provided holders crosswise onto the clamped part of the sample (with slight pressure to the left); the measurement is carried out with the following parameters: Plot Max COF 1; Cal Factor 1.0163; Min COF 0; Calibration Constant 1015.3; Max time 8 s; Weight 0; Min time 0 s; Constant of gravitation 9.82; Sled weight 850 g; Kinetic speed 20 mm/s; Stat ramp adjustment 0.5; Pause 2 s

- the measurement result is given as the arithmetic mean of three individual measurements

[0029] Optionally, the paper has an embossed structure to achieve this coefficient of friction. The desired coefficient of friction may additionally or alternatively be achieved by other suitable means.

[0030] The packaged goods can be essentially cuboid-shaped, such as a stack of boards formed from a plurality of boards lying on top of one another and/or next to one another. Of course, this method can also be used to package other-shaped packages.

[0031] Optionally, the invention relates to a method for packaging a packaged product using a paper web, wherein the packaged product has a packaged product surface, packaged product side surfaces and a packaged product base surface.

[0032] The method may comprise the following step: covering the surface of the packaged goods with the paper web, wherein the paper web projects beyond the surface of the packaged goods on all sides.

[0033] The method may comprise the following step: folding over those sections of the paper web which project beyond the surface of the packaged goods in the direction of the side surfaces of the packaged goods, whereby tabs projecting from the packaged goods are formed, each tab comprising two layers of paper web.

[0034] The method may comprise the following step: connecting the two paper web layers in the region of the flaps.

[0035] The method may comprise the following step: attaching the tabs to the outer

lying surface of the paper web.

[0036] Optionally, it is provided that the paper web has a tensile work index of at least 0.9 J/g, preferably of at least 2.2 J/g and more preferably of at least 3.5 J/g, wherein the tensile work index is the geometric mean of the tensile work index of the paper web according to ISO 1924-3:2005 in the machine direction and in the transverse direction.

[0037] Optionally, it is provided that the paper web has an elongation at break in the machine direction and in the transverse direction according to ISO 1924-3:2005 of at least 1.8%, preferably of at least 5%.

[0038] Optionally, it is provided that the paper web has a Cobb 60 value according to ISO 535:2014 of at most 40, preferably of at most 30 and more preferably of between 10 and 25.

[0039] Optionally, it is provided that the paper web has a tear resistance index in the machine direction and/or in the transverse direction according to ISO 1974:2012 of at least 5 mN/m?g, preferably of at least 10 mN/m?/g and more preferably of at least 15 mN*/m?g.

[0040] Optionally, it is provided that the paper web has an elongation at break in the machine direction and/or in the transverse direction according to ISO 1924-3:2005 of at least 8% and preferably of at least 10%.

[0041] Optionally, it is provided that the wet tensile strength of the paper web in the machine direction is at least 5%, preferably at least 10% and more preferably at least 15% of the dry tensile strength of the paper web in the machine direction according to ISO 1924-3:2005 and/or that the wet tensile strength of the paper web in the transverse direction is at least 5%, preferably at least 10% and more preferably at least 15% of the dry tensile strength of the paper web in the transverse direction according to ISO 1924-3:2005.

[0042] Where appropriate, the paper web shall have a grammage according to ISO 536:2019 of between 40 g/m² and 150 g/m².

[0043] Optionally, it is provided that the paper web has an opacity according to ISO 2471:1977 of at least 75%, preferably of at least 85% and more preferably of at least 95%.

[0044] Optionally, it is provided that the paper web has a coefficient of friction of more than 0.3, preferably more than 0.7.

[0045] If appropriate, it is provided that the paper web has an embossed structure.

[0046] Optionally, it is provided that the paper web contains a hydrophobizing agent, in particular a hydrophobic sizing agent, wherein the hydrophobizing agent is selected, for example, from one or more of the following: an alkyl ketene dimer, an alkenyl succinic anhydride, a resin size and derivatives thereof.

[0047] Optionally, it is provided that the paper web is coated, in particular polymer-coated.

[0048] If necessary, it is provided that the two paper web layers are joined, for example, by one of the following measures: sewing, needling, gluing, hot pressing, thermal welding, friction welding, pulse welding with ultrasonic jaws, heat sealing.

[0049] If necessary, it is provided that the paper web layers are connected to one another along side edges of adjacent packaged goods side surfaces.

[0050] If appropriate, it is provided that the packaged goods are a stack of goods formed from several items, the items being, for example, wooden boards.

[0051] If necessary, it is provided that the packaged goods are essentially cuboid-shaped.

[0052] If appropriate, it is provided that the tear resistance of the paper web is increased by folding the edges of the paper web once or several times and, if appropriate, inserting or gluing a ribbon or cord in the area of the edges.

[0053] If appropriate, the invention also relates to an arrangement of a paper web on a packaged product.

[0054] It can be provided that the packaged goods have a packaged goods surface, packaged goods side surfaces and a packaged goods base surface.

[0055] It can be provided that the surface of the packaged goods is completely covered and the side surfaces of the packaged goods are at least partially covered by the paper web.

[0056] It can be provided that by folding over sections of the paper web which project beyond the surface of the packaged goods, flaps are provided in the direction of the side surfaces of the packaged goods, each flap comprising two layers of the paper web.

[0057] It can be provided that the two paper web layers are connected to each other in the area of the flaps.

[0058] It may be provided that the tabs are optionally attached to the outer surface of the paper web.

[0059] In particular, the tabs can be attached to the surface of the paper web by gluing, nailing or clamping.

[0060] If necessary, it is provided that the tabs or the excess material are removed or cut off, in particular after the paper web layers have been joined, for example by needling, gluing or sealing.

[0061] Optionally, it is provided that the paper web has a tensile work index of at least 0.9 J/g, preferably of at least 2.2 J/g and more preferably of at least 3.5 J/g, wherein the tensile work index is the geometric mean of the tensile work index of the paper web according to ISO 1924-3:2005 in the machine direction and in the transverse direction.

[0062] Optionally, it is provided that the paper web has an elongation at break in the machine direction and in the transverse direction according to ISO 1924-3:2005 of at least 1.8%, preferably of at least 5%.

[0063] Optionally, the arrangement provides that the paper web has one or more features of the paper web, as also described in connection with the method.

[0064] Further features emerge from the patent claims, from the figures and from the description of the embodiment.

[0065] The method and the arrangement are explained in detail below using an exemplary embodiment and with reference to the accompanying figures.

[0066] Showing:

[0067] Fig. 1 is a schematic side view of a packaged product during a process step;

[0068] Fig. 2 shows a further schematic side view of the packaged goods during the process step shown in Fig. 1;

[0069] Fig. 3 is a schematic side view of the packaged goods during a further process step; and

[0070] Fig. 4 is a schematic view of the packaged goods.

[0071] Unless otherwise indicated, the figures show the following features: packaged goods 1, paper web 2, packaged goods surface 3, packaged goods side surface 4, flap 5, side edge 6, board 7, top edge 8.

[0072] Fig. 1 shows a schematic side view of a packaged item 1 during a first method step according to an embodiment, wherein the packaged item 1 is a stack of boards formed from a plurality of boards 7. Fig. 2 shows a schematic side view of the packaged item 1 rotated by 90° in the same method step.

[0073] The packaged goods are essentially cuboid-shaped. In Figs. 1 and 2, the packaged goods surface 3 is covered with a paper web 2, with the paper web 2 projecting beyond the packaged goods surface 3 on all sides.

[0074] In the subsequent step of this embodiment, those sections of the paper web 2 that extend beyond the packaged goods surface 3 are folded over in the direction of the four packaged goods side surfaces 4, whereby a fold is made along the upper edges 8 of the packaged goods 1 that lie between the packaged goods surface 3 and the packaged goods side surfaces 4. The direction in which the folding takes place is illustrated by arrows in Figs. 1 and 2.

After folding, the paper web 2 also lies against the packaged goods' side surfaces 4. Due to the all-round folding, flaps 5 are formed from the paper web 2 by excess material, which is schematically illustrated in the view of Fig. 3. In this view, the packaged goods 1 are already covered by the paper web 2 in the area of their side surfaces 4, but the flaps 5 protrude.

[0075] In this exemplary embodiment, the tabs 5 have a triangular shape due to the cuboid geometry of the packaged goods 1, with one leg of each triangular tab 5 running along a side edge 6 of the packaged goods 1. Each tab 5 is formed from two layers of the paper web 2.

[0076] For fixing, in this embodiment, the two superimposed layers of the paper web are joined together by needling along the side edges 6 of the packaged goods 1. In other embodiments, the joining can be achieved by other suitable means, for example by gluing or welding, the latter particularly in the case of plastic-coated papers.

[0077] Finally, the tabs 5 can be folded over and attached, for example, glued, to the outer surface of the paper web 2 to secure their position. The excess material, in particular the protrusions of the tabs, can be trimmed off if necessary.

[0078] The method according to this embodiment can be carried out in a packaging system such as that used in the prior art for packaging stacks of boards with plastic film. Minor modifications may be required to such a packaging system, which are within the scope of the typical actions of a person skilled in the art, in order to adapt the system to a method according to the invention.

[0079] An embodiment of a packaged item 1 packaged according to a method according to the invention is shown in Fig. 4. This is therefore an embodiment of an arrangement according to the invention of a packaged item 1 with a paper web 2.

[0080] The paper web 2 used in the embodiment has the following property profile:

Property Unit Standard Comment Basis weight [g/m?] 70 ISO 536

Tensile strength [J/g] 2.56 ISO 1924-3 geometric mean Tensile strength [Nm/g] 86.11 ISO 1924-3 geometric mean Elongation at break [%] 5.29 ISO 1924-3 geometric mean Wet strength [%] 22.7 ISO 1924-3 Machine direction

Cobb60 [g/m²] 24 ISO 535

Tear resistance [mN/m2/g] 11.35 ISO 1974 Opacity [%] 85.2 ISO 2471 CoF 0.6 with Amontons MT

Friction Tester

[0081] Other papers may also be used which meet the essential properties for the respective application.

Claims (16)

Patent claims 1. A method for packaging a packaged item (1) using a paper web (2), wherein the packaged item (1) has a packaged item surface (3), packaged item side surfaces (4) and a packaged item base surface, the method comprising the following steps: - covering the packaged goods surface (3) with the paper web (2), whereby the paper web (2) extends beyond the packaged goods surface (3) on all sides, - folding over those sections of the paper web (2) which project beyond the packaged goods surface (3) in the direction of the packaged goods side surfaces (4), whereby tabs (5) projecting from the packaged goods (1) are formed, each of which comprises two paper web layers, - Connecting the two paper web layers in the area of the flaps (5), - if necessary, attaching the tabs (5) to the outer surface of the paper web (2), characterized in that the paper web (2) has a tensile work index of we- at least 0.9 J/g, preferably at least 2.2 J/g and more preferably at least 3.5 J/g, where the tensile work index is the geometric mean of the tensile work index Index of the paper web (2) according to ISO 1924-3:2005 in machine direction and in cross direction and that the paper web (2) has a breaking elongation in the machine direction and in the transverse direction according to ISO 1924-3:2005 of at least 1.8%, preferably of at least 5%. 2. Method according to claim 1, characterized in that the paper web (2) has a Cobb 60 value according to ISO 535:2014 of at most 40, preferably of at most 30 and more preferably of between 10 and 25. 3. Method according to claim 1 or 2, characterized in that the paper web (2) has a tear resistance index in the machine direction and/or in the transverse direction according to ISO 1974:2012 of at least 5 mN/m?/g, preferably of at least 10 mN/m?/g and more preferably of at least 15 mN*/m?/g. 4. Method according to one of claims 1 to 3, characterized in that the paper web (2) has an elongation at break in the machine direction and/or in the transverse direction according to ISO 1924-3:2005 of at least 8% and preferably of at least 10%. 5. The method according to any one of claims 1 to 4, characterized in that the wet tensile strength of the paper web (2) in the machine direction is at least 5%, preferably at least 10% and more preferably at least 15% of the dry tensile strength of the paper web (2) in the machine direction according to ISO 1924-3:2005 and/or that the wet tensile strength of the paper web (2) in the transverse direction is at least 5%, preferably at least 10% and more preferably at least 15% of the dry tensile strength of the paper web (2) in the transverse direction according to ISO 1924-3:2005. 6. Method according to one of claims 1 to 5, characterized in that the paper web (2) has a grammage according to ISO 536:2019 of between 40 g/m² and 150 g/m². 7. Method according to one of claims 1 to 6, characterized in that the paper web (2) has an opacity according to ISO 2471:1977 of at least 75%, preferably of at least 85% and more preferably of at least 95%. 8. Method according to one of claims 1 to 7, characterized in that the paper web (2) has a coefficient of friction of more than 0.3, preferably more than 0.7. 9. Method according to one of claims 1 to 8, characterized in that the paper web (2) has an embossed structure. 10. The method according to any one of claims 1 to 9, characterized in that the paper web (2) contains a hydrophobizing agent, in particular a hydrophobic sizing agent, wherein the hydrophobizing agent is selected, for example, from one or more of the following: an alkyl ketene dimer, an alkenyl succinic anhydride, a resin size and derivatives thereof. 11. Method according to one of claims 1 to 10, characterized in that the paper web (2) is coated, in particular polymer-coated. 12. Method according to one of claims 1 to 11, characterized in that the two paper web layers are joined by at least one of the following measures: sewing, needling, gluing, hot pressing, thermal welding, friction welding, pulse welding with ultrasonic jaws, heat sealing. 13. Method according to one of claims 1 to 12, characterized in that the paper web layers are connected to one another along side edges (6) of adjacent packaged goods side surfaces (4). 14. Method according to one of claims 1 to 13, characterized in that - the packaged goods (1) are a stack of goods formed from a plurality of goods, the goods being, for example, wooden boards, and/or - the packaged goods (1) are substantially cuboid-shaped. 15. Method according to one of claims 1 to 14, characterized in that the tear resistance of the paper web (2) is increased by the edges of the paper web (2) being folded over once or several times and, if appropriate, a ribbon or cord being inserted or glued in the region of the edges. 16. Arrangement of a paper web (2) on a packaged product (1), - wherein the packaged goods (1) have a packaged goods surface (3), packaged goods side surfaces (4) and a packaged goods base surface, - wherein the packaged goods surface (3) is completely covered and the packaged goods side surfaces (4) are at least partially covered by the paper web (2), - whereby flaps (5) formed by folding over sections of the paper web (2) which project beyond the packaged goods surface (3) in the direction of the packaged goods side surfaces (4) are provided, each flap comprising two paper web layers, - wherein the two paper web layers are connected to each other in the area of the flaps (5), and - wherein the tabs (5) are optionally attached to the outer surface of the paper web (2), characterized in that the paper web (2) has a tensile work index of we- at least 0.9 J/g, preferably at least 2.2 J/g and more preferably at least 3.5 J/g, where the tensile work index is the geometric mean of the tensile work index Index of the paper web (2) according to ISO 1924-3:2005 in machine direction and in cross direction and that the paper web (2) has a breaking elongation in the machine direction and in the transverse direction according to ISO 1924-3:2005 of at least 1.8%, preferably of at least 5%. 2 sheets of drawings