BE1024769B1 - METHOD FOR PACKING POWDERS AND GRANULATES - Google Patents

Abstract

In a first aspect, the present invention describes a method for packaging powdered and / or granular materials, wherein the package is mechanically pressed, at a mechanical pressure of at least 4000 Pa and at most 80000 Pa, and wherein this package is rejected if at that pressing a compression of the package of more than 15% occurs. In a second aspect, the present invention describes a package comprising a powdered and / or granular material, which material is packaged in said package via the aforementioned method.

Description

Priority date:

International classification: B65B 57/00, B65B 61/24 Application number: BE2017 / 5305

Date of submission: 28/04/2017

Holder:

J.T. MINERALEN BVBA 2480, DESSEL Belgium

Inventor:

TIELEN Tavi 2480 DESSEL Belgium

METHOD FOR PACKING POWDERS AND GRANULATES

In a first aspect, the present invention describes a method for packaging powdered and / or granular materials, in which the packaging is pressed mechanically, at a mechanical pressure of at least 4000 Pa and at most 80000 Pa, and wherein this packaging is rejected if there is pressing, a packaging compression of more than 15% occurs. In a second aspect, the present invention describes a package comprising a powdery and / or granular material, which material is packed in said package via the aforementioned method.

BELGIAN INVENTION PATENT

FPS Economy, K.M.O., Self-employed & Energy

Publication number: 1024769 Filing number: BE2017 / 5305

Intellectual Property Office

International classification: B65B 57/00 B65B 61/24 Date of issue: 25/06/2018

The Minister of Economy,

Having regard to the Paris Convention of 20 March 1883 for the Protection of Industrial Property;

Having regard to the Law of March 28, 1984 on inventive patents, Article 22, for patent applications filed before September 22, 2014;

Having regard to Title 1 Invention Patents of Book XI of the Economic Law Code, Article XI.24, for patent applications filed from September 22, 2014;

Having regard to the Royal Decree of 2 December 1986 on the filing, granting and maintenance of inventive patents, Article 28;

Having regard to the application for an invention patent received by the Intellectual Property Office on 28/04/2017.

Whereas for patent applications that fall within the scope of Title 1, Book XI, of the Code of Economic Law (hereinafter WER), in accordance with Article XI.19, § 4, second paragraph, of the WER, the granted patent will be limited. to the patent claims for which the novelty search report was filed, when the patent application is the subject of a novelty search report indicating a lack of unity of invention as referred to in paragraph 1, and when the applicant does not limit his filing and does not file a divisional filing in accordance with the search report.

Decision:

Article 1

J.T. MINERALEN BVBA, Goormansdijk 68 bus E, 2480 DESSEL Belgium;

represented by

BRANTS Johan Philippe Emile, Pauline Van Pottelsberghelaan 24, 9051, GHENT;

CRABBE Ellen, Pauline van Pottelsberghelaan 24, 9051, GHENT;

VAN CAUTEREN Tim, Pauline Van Pottelsberghelaan 24, 9051, GHENT;

a Belgian invention patent with a term of 20 years, subject to payment of the annual fees as referred to in Article XI.48, § 1 of the Code of Economic Law, for: METHOD

FOR PACKAGING POWDERS AND GRANULATES.

INVENTOR (S):

TIELEN Tavi, Goormansdijk 68 bus E, 2480, DESSEL;

PRIORITY:

BREAKDOWN:

Split from basic application: Filing date of the basic application:

Article 2. - This patent is granted without prior investigation into the patentability of the invention, without warranty of the Merit of the invention, nor of the accuracy of its description and at the risk of the applicant (s).

Brussels, 25/06/2018,

With special authorization:

BE2017 / 5305

METHOD FOR PACKING POWDERS AND GRANULATES

TECHNICAL DOMAIN

The present invention relates to methods of packaging powdered and / or granular materials. The invention further relates to packaging comprising powdered and / or granular materials.

STATE OF THE ART

Several issues play a role in the packaging of powdered and / or granular materials. First of all, it is important that the correct amount of material is put into the packaging before sealing it. In addition, it is preferable that a given amount of the material occupies the smallest possible volume in the bag. The material then takes up a minimal amount of space during storage and transport. To this end, the material must be compacted. Furthermore, with a view to the storage and transport of the packaged material, it is advantageous that the individual packages can be easily stacked. For packaging hydrophilic materials, it is preferred that the packaging used be impermeable to liquids. In this way, any contact of the packaged hydrophilic material with environmental liquids can be avoided.

EP 1 312 547 A1 describes an apparatus and a method for packaging

2.5 solid materials that can flow. In particular, the pressure in the package is reduced. The packaged material is thereby compacted.

Such devices are often quite complex and therefore subject to failure. As a result, a significant percentage of packaged materials do not meet .30 requirements; these must be rejected. The failure rate may vary depending on the type of packaged material. In the case of cement, this is about 0.5%. Manually detecting and rejecting those poorly packaged materials is very labor intensive and economically unfavorable.

The present invention aims to find a solution to at least one of the above-mentioned Problems.

BE2017 / 5305

SUMMARY OF THE INVENTION

For this purpose, the invention provides in a first aspect a method according to claim 1 for packaging powdery and / or granular materials, which method comprises the steps of:

providing a metered amount of a powdery and / or granular material in a bag-shaped package, which package defines a receiving opening, and closing the receiving opening, thereby reducing the pressure in the package, before and / or after closing of the reception opening; in particular, the method further comprises the step of mechanically pressing the closed and pressure-reduced packaging, at a mechanical pressure of at least 4000 Pa and at most 80000 Pa; the said packaging is rejected if a pressing of more than 15% occurs on the packaging. An advantage is that badly packaged packages can be automatically detected in this way.

In a second aspect, the invention relates to a bag-shaped packaging comprising a powdery and / or granular material, which material is packaged in said packaging via the method described above; in particular, the compression of the package amounts to a maximum of 15%, when the package is pressed again mechanically, under a mechanical pressure of at least 4000 and at most 80000 Pa. Such packages are more stackable.

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to methods of packaging powdery and / or granular materials. The invention further relates to packages comprising powdery and / or granular materials.

.30

Unless otherwise defined, all terms used in the description of the invention, including technical and scientific terms, have the meaning generally understood by those skilled in the art of the invention. For a better assessment of the description of the invention, the following terms are explicitly explained.

BE2017 / 5305

One, de and the in this document refer to both the singular and the plural unless the context clearly assumes otherwise. For example, “a segment means one or more than a segment.

When used approximately in this document at a measurable quantity, a parameter, a duration or moment, and the like, then variations of +/- 20% or less, preferably +/- 10% or less, more preferably + are meant / -5% or less, even more preferably +/- 1% or less, and even more preferably +/- 0.1% or less than and of the quoted value, insofar as such variations apply in the disclosed invention. Here, however, it is to be understood that the value of the quantity using the term about or around is itself specifically disclosed,

The terms include, including, provided with its synonyms and are indusive or open terms that indicate the presence of what follows, and which do not exclude or prevent the presence of other components, features, elements, members, steps, known from or described in the state of the art.

In a first aspect, the invention relates to a method for packaging powdery and / or granular materials, which method comprises the steps of:

providing a metered amount of a powdery and / or granular material in a bag-shaped package, which package defines a receiving opening, and closing the receiving opening,

2.5 wherein the pressure in the package is reduced prior to and / or following the closure of the receiving opening; in particular, the method further comprises the step of mechanically pressing the closed and pressure-reduced packaging, at a mechanical pressure of at least 4000 Pa and at most 80000 Pa; the said packaging is rejected if, on pressing, a .30 compression of the packaging of more than 15% occurs.

Preferably, the powdery and / or granular material is a solid material which can flow, Preferably it is a mineral in powder form, with a certain flow. Some non-limitative examples of such materials are powders and granulates such as sand, gravel, flour, grain, washing powder and chemical powders such as PVC. Preferably, the term powdery and / or granular materials, as used throughout this document, tolerates materials selected from the

BE2017 / 5305 group comprising gravel, sand, cement, and / or mixing requirement thereof, further preferably on cement and cementitious products.

Decreasing the pressure in the package results in a thickening of the content of that package. In other words, the powdery and / or granular material compacts. At the same time, the packaging is closer to its content. The inventors found that, with this pressure drop, the contents of the package become less deformable and less compressible. The contents then behave together with the packaging as a single, limited deformable and limited compressible package. In addition, the inventors determined that the degree of compressibility, as a property of that package, can quantify the success of the packaging process. Alternatively, comparable information can also be gleaned from the deformability of the package.

Some packages are packaged badly and therefore do not meet the strict requirements. For example, the pressure within the package has not been sufficiently reduced. The packed material is therefore insufficiently compacted. In another, non-limiting example, the package is torn or perforated such that atmospheric pressure has recovered or will recover within that package. The content will lose its (originally) compacted state. Nor is such a package liquid-tight. In this and other cases, the packaging fails. It is necessary to detect this failure.

The inventors found that when mechanically pressing packages,

2.5 Preferably, under a mechanical pressure of at least 1000 Pa and at most 100000 Pa, the degree of compression is allowed to distinguish poorly packaged and well packaged packages. Preferably, said mechanical pressure is at least 4000 Pa, more preferably at most 80000 Pa, more preferably said mechanical pressure is about 56600 Pa. In particular, when pressing a poorly packaged package, the size of that package will decrease in the direction of the pressure applied, and in the pressed location, by more than 15%, preferably by significantly more than 15% , for example by 2.0% or more. On the other hand, when pressing a package that meets the requirements met, the size of that package will decrease by a maximum of 15% in the direction of the applied pressure, and at the pressed location, preferably further by a maximum of 10%.

BE2017 / 5305

This allows automatic detection of the badly packaged packages. Preferably, a detection system is provided for this purpose, which detection system comprises one or more distance sensors and / or pressure sensors. A strain gauge and / or a piezoelectric sensor may be suitable as a pressure sensor. An optical, acoustic, magnetic and / or laser based range finder may be suitable as a range finder. Such and other suitable sensors for distance and pressure measurement are known in the art. When a package whose package does not meet the requirements, i.e. a poorly packed package, is detected, the package concerned is rejected. This can be done manually and / or in a fully automatic manner. Preferably, at least the detection of the packaged packages itself is done in a fully automatic manner.

According to a further or alternative embodiment of the method, this is done by means of a stamp, which stamp has a stamp surface. Preferably, said die-cast surface has no sharp corners, and is further preferably spherical or flat disc-shaped. An advantage is that it will not perforate the packaging, at the specified pressures. Preferably, said stem pulp surface also has a diameter of at least 2 cm and at most 8 cm, more preferably with a diameter of about 5 cm.

According to a further or alternative embodiment of the method, the Punch is vertically lowered onto the package, the pimpled surface pressing vertically against that package, at a specified pressure, for example about 56600 Pa. The compressibility of the package (packaging + content)

2.5 affects the distance over which that Stamp can descend. On the other hand, an optical eye, or any other distance sensor, as known in the art, measures and records this distance. In case the distance exceeds a limit value, the Punch is lifted back up and the bag is discarded. Moreover, from the aforementioned distance, the local impression (or simply impression) .30 of the package can be determined, at the location where that package is pressed by means of the Stamp.

Preferably, the pressure applied by the Punch is adjustable. The applied pressure can then be adjusted according to the nature of the packaging material and according to the nature of the packaged material. According to a preferred embodiment, each package is pressed and tested at least once by

BE2017 / 5305 the Stamp. In further preference, each package is tested exactly one mow using the Stamp.

Further, an alternative, non-limiting embodiment, measures the pressure necessary to achieve an indentation of about 15% of the package.

This pressure value is then tested against a threshold value. if the measured pressure value is significantly lower than the threshold value, it is a poorly packaged package. The threshold value is preferably a minimum of 1000 Pa and a maximum of 10000 Pa, more preferably more than 4000 Pa, more preferably less than 80000 Pa. Preferably, that threshold value is approximately 56600 Pa.

Preferably, the amount of the material is pre-dosed via a weighing device provided for this purpose. Usually such weighers on zJcb are already able to dose the material in accurate quantities. Nevertheless, in some cases it is desirable to additionally control the amount of the material ultimately packed. The dosage can then be controlled through the package compressibility and / or deformability values in an equivalent manner as described above. Packages comprising a greater amount of the material are typically slightly more compressible. On the other hand, packages comprising a smaller amount of the material are typically slightly less compressible. It is then sufficient to provide a detection system and to determine suitable thresholds for the compressibility (or for the deformability).

2.5

According to a further or alternative embodiment of the method, the pressure in the packaging is reduced to a minimum of 0.3 bar and a maximum of 0.8 bar. More preferably, the pressure in the package is reduced to a maximum of 0.7 bar, and further preferably, the pressure in the package is reduced to about -0.66 bar .30 relative. A vacuum pump is preferably used for this. Such pressures result in a sufficient degree of compaction of the powdery and / or granular material.

According to a further or alternative embodiment of the method, the packaging comprises an airtight and liquid-tight foil material. In particular, the liquid tightness of the packaging is important for hydrophilic materials such as cement. Water-attracting materials that come into contact with water

BE2017 / 5305 clump or even clump completely. In the case of cement and cement-containing mixtures, wetting with water leads to premature curing. This makes the material in question unbreakable. The amount of moisture absorbed or lost also contributes to the total weight and the total volume of the material.

The packaging is preferably liquid-tight, and thus impermeable to liquids. Water-attracting materials packaged according to the present method can still be stored in moist environments. For example, the packages can be stacked in the open, where they come in contact with rain. Because the packaging is impermeable to liquids, there is no direct contact between the water-attracting material and the rainwater.

Furthermore, the packaging material must be sufficiently sturdy: typically materials such as cement, gravel, sand and mixtures thereof are packed in heavy packages. Such packages have an individual mass of at least 5 kg and a maximum of 50 kg, more preferably an individual mass of at least 10 kg, and further preferably a maximum of 25 kg; further preferably they have an individual mass of about 25 kg.

Furthermore, a further or alternative embodiment of the method, the packaging comprises a polymer. According to a further or alternative embodiment of the method, the package comprises polyethylene (PE). An advantage is that this material is sufficiently sturdy.

2.5

In case of air-permeable cracks and / or perforations, the contents of the package return to atmospheric pressure. On the one hand, this is accompanied by an intake of (moisture) ambient air, into the packaging. On the other hand, the packaged material thereby loses its original, compacted state. Preferably, therefore, the packaging material is highly resistant to spontaneous cracking and crack propagation, for example, Polyethylene (PE) is a suitable material in this regard. Other materials are also suitable for this application, as will be recognized by those skilled in the art. Preferably, the packaging material comprises polyvinyl chloride (PVC) and / or PE. Preferably, the packaging is a PE packaging.

BE2017 / 5305

In the prior art, multilayer packaging is usually used for packaging cement. These comprise an outer layer of paper and / or cardboard, and an inner layer comprising a plastic. In a preferred embodiment of the present method, on the other hand, the package is formed from one layer of a PE-containing foil material. An advantage of this is that the empty packaging material can be recycled much more easily afterwards. In principle, PE is a high-quality material that can be easily processed back, making it worth the money.

Preferably, the receiving opening is closed airtight and liquid-tight, in such a way that the package as a whole is liquid-tight, and furthermore preferably waterproof.

According to a further or alternative embodiment of the method, the receiving opening is closed thermally. The material surrounding the receiving opening is thereby brought together and melted together. Preferably, the packaging material comprises a thermopiast and more preferably the packaging material comprises thermoplastic PE. An advantage is that the receiving opening of a bag of thermoplastic PE can be closed thermally. An advantage of the thermal sealing of the packaging is that it is a very simple process. In addition, a thermally closed seam provides the required strength.

According to a further or alternative embodiment of the method, the pressure in the package is reduced prior to closing the receiving opening. In

2.5 alternative methods of the prior art, the packages have vent holes. Afterwards, after closing the reception opening, at least part of the remaining air is pushed out through these vent holes. This is done by compressing the package (packaging + packaged material), under a crushed tape, or under the weight of the parent packages, .30 when taped on a pallet. However, the drawback of vent holes is that the resulting bags are not airtight and / or watertight.

According to a further or alternative embodiment of the method, that Decreasing that pressure in the package comprises the step of introducing one or more suction sins into the filled package. These suction probes are connected to a vacuum pump. Preferably, said suction probes are introduced vertically downwardly through the upwardly directed receiving opening

BE2017 / 5305 of the filled packaging. Via a suction opening at the bottom of the suction probes, they suck part of the air out of the cement. For example, the suction probes densify the packed material. Further preferably, the suction probes are gradually vertically elevated upward from the package during that suction. This has the advantage that the air is drawn from the bottom to the top of the material.

According to an alternative embodiment of the method, the package is provided with one or more valves, to which a suction probe can be connected. It is then possible to reduce the pressure within the packaged material before and / or after closing the receiving opening by means of one or more suction probes. Preferably, the valve can be closed by means of a screw cap, a plug, or by any other prior art closure. Preferably, the valve is a one-way valve, suitable for cooperation with a suction probe. That valve allows only airflow from the interior of the bag to the suction probe, not reverse airflow.

According to a second, alternative embodiment of the method, a suction opening is made in the package. Such a suction opening can be provided in the bag-shaped packaging in various ways, for instance by making one or more perforations and / or cuts in the wall of the packaging. Preferably, the suction opening is only made after closing the receiving opening of the package. The pressure in the package is controlled through that

2.5 suction opening lowered, for example by placing a suction probe through that suction opening. Preferably, said suction opening is closed airtight and liquid-tight afterwards, for instance by means of a self-adhesive lid.

30 According to a further or alternative embodiment of the method, Lowering the pressure in the package comprises the step of housing the package in a reduced pressure environment. Preferably the package (the bag comprising the packaged material) is housed in a vacuum clock which can be closed airtight by means of a valve. The interior of this vacuum breeding is connected to a vacuum pump, and can therefore be brought to a reduced pressure. Preferably the package is filled, but the receiving opening of the package is not yet closed as described above.

BE2017 / 5305

An equilibrium is set, whereby the same, reduced pressure also installs inside the open packaging. The receiving opening is then closed, for example in a thermal manner. This can be done while the packaging is still in the pressure chamber or after that packaging has been cut out of that pressure chamber.

According to alternative embodiments of the method, the pressure within the package is reduced by means of a vacuum clock, the reception opening having already been closed. Preferably, the packaging is provided with a valve, preferably a one-way valve. When the ambient pressure is lowered enough, air is extracted from the interior of the package through that one-way valve. However, that one-way valve automatically prevents any airflow in the reverse direction when the package is then brought back under atmospheric pressure. Such a packaging with vent can be used in combination with a pressure chamber, said ambient pressure referring to the pressure within that pressure chamber. As an alternative to one (or more) one-way valves, one or more two-way valves can be provided in the package, or one or more suction openings can be made in the package.

According to a further or alternative embodiment of the method, the pressure-reduced package is shaken and / or vibrated. This is particularly advantageous in the case of granular materials, which rearrange during shaking and / or vibration and thereby occupy a smaller volume. Shaking and / or vibration can be done before, during, or after the pressure has slowed down inside the package. Bee

2.5 further preferably, the bags are shaken, after the pressure has been reduced inside.

According to a further or alternative embodiment of the method, the closed and pressure-reduced packaging is rolled, under and / or between one or more rollers. Preferably, in that roll, the package is provided with two parallel, .30 substantially flat sides. The package (package comprising the packaged material) is thereby provided with two, substantially parallel, flat sides. In addition, all packages therefore have a more homogeneous thickness. The packages are therefore more stackable and can moreover be stacked more stably. In addition, if the package is provided with a one-way valve as described above, it is possible that even more air can be expelled from the package during that rolling. Preferably, however, no vention is provided in the package.

BE2017 / 5305

Preferably, the closed and pressure-reduced packages are stacked on paillettes. More preferably, the packages / packages are stacked in connection. An advantage is that it makes it easier to transport them in large numbers at the same time. Further preferably these are standardized paillettes such as EURO pallets or ISO palettes.

In a second aspect, the invention relates to a bag-shaped package comprising a powdery and / or granular material, which material is packed in said package via the method described above; in particular, the compression of the package amounts to a maximum of 15%, when the package is pressed again mechanically, under a mechanical pressure of at least 4000 and at most 80000 Pa.

The invention will now be further elucidated with reference to the following examples and the accompanying figures, without, however, being limited thereto.

Example 1: oozing a bag of cement

Example 1 describes an embodiment of the method, as performed by an automated packaging installation.

A screw provides cement to a weighing hopper until it is filled with approximately 25.15 kg of cement.

A tubular, single-layer, PE-containing foil material is provided for the packaging itself. This film material is rolled up on a roll, and along the edge the film material is provided with black, stripe-shaped prints, at regular distances from each other. An optical view of the packaging installation reads these prints .30. The packaging installation can now determine how far the packaging should be unrolled, to release one packaging length. This packaging length is unrolled and cut, and the packaging material is thermally closed along the cut. This is done by fusing the PE-containing film material over the entire width, along a transverse seam.

For this purpose, the foil material is heated along that transverse seam to about 160 ° C. This seam will form the bottom closure of the bag. It is preferably airtight and liquid-tight.

BE2017 / 5305

The resulting bag-shaped package is closed at the bottom and defines a receiving opening at the top, it is gripped near that receiving opening, and placed under the weigh bunker outlet. The receiving opening is now pushed open, after which the contents of the weighing bunker (about 25.15 kg of cement) are discharged into the bag-shaped packaging, so that the packaging is filled with cement.

In a next step, two suction probes are introduced vertically down into the package. They suck a first part of the air out of the cement via a suction opening at the bottom of the suction probes. For example, the suction probes provide an initial compaction of that cement. During that suction, the suction probes are gradually vertically lifted upwards, out of the package. The extracted air passes through a filter, separating it from a small amount of entrained core. The filled bag is then sebuded for a further sealing of the cement.

After this the bag is laid up in a vacuum breeding. The vacuum clock is closed at the bottom by means of a valve, and then brought to a reduced pressure inside, of about -0.66 bar relative. The vacuuming of the bag, whereby the same pressure is adjusted in the cement material, takes 4 to 7 seconds; this may vary slightly from bag to bag,

The cement is now sufficiently compacted, and the bag is also closed at the top. This is done again by melting a transverse seam, at the top and across the entire width of the bag, at a temperature of approximately 160 ° C. Any remaining flap of packaging material is folded over and against the side

Glued 2.5 of the bag, or glued against it with a piece of adhesive tape. The packaging as a whole, and in particular both the bottom seam and the top seam, are closed airtight and liquid-tight. As a result, the packaged cernent has a longer shelf life, and the bags of sieves can be stored for a long time in a moist environment, .30

The bag is about 50 cm high, about 30 cm wide and about 15 cm thick. The upright bag is now placed / pushed down on its largest (approx. 30 cm x 50 cm) side. The bag is then brought under a Stamp via a conveyor belt. The Stamp has a cylindrical, downwardly directed end, thereby providing a disc-shaped stamp surface with a diameter of approximately 3 cm. The packaging is now pressed from above by the downwardly directed stamp, by means of an electronically controlled compressed air cylinder. In doing so, the Stamp practices

BE2017 / 5305 emits a downward force of about 40 N, which corresponds to a mechanical pressure on the package of about 56600 Pa. At the same time, the local impression of the bag can be measured and recorded by means of an optical eye. The bag / packaging is rejected if an indentation of more than 15% occurs. Possible causes are that the bag contains too much air and is therefore bailon-shaped, that the bag has been cut / geized too large, that the bag is perforated somewhere, and / or that there is too little cement in the bag.

Then, the bags (still lying flat on their largest side) are conveyed under a set of transverse rollers through a conveyor belt. The filled, pressure-reduced and closed packages are rolled to a homogeneous thickness. The distance between the underlying conveyor belt and each successive roi, hanging successively above that conveyor belt, continues to decrease; every consecutive roi rolls the package slightly thin. During this rolling a further compaction of the cement occurs, and the packages are provided with two flat sides: the top and bottom in case of the flat laying package. This is advantageous when stacking.

In a final step, the filled, pressure-reduced, closed and rolled packages are stacked on a palette. Preferably, each package is sprayed at the top with a weak glue, so that the bags can be stacked much more firmly, so that it is no longer necessary to bind the bags. The tiles are optionally wrapped because cement is a high-quality and expensive material. However, given the airtight and liquid-tight packaging, that is a breeze

2.5 not necessary.

BE2017 / 5305

Claims (14)

CONCLUSI ES A method for packaging powdery and / or granular materials such as cement, gravel, sand and mixtures thereof, into packages with an individual mass of at least 10 kg and at most 50 kg, which method comprises the steps of: providing a metered amount of a powdery and / or granular material in a bag-shaped package, which package defines a receiving opening, and closing the receiving opening, thereby reducing the pressure in the package, before and / or after closing of the receiving opening, and wherein the method further comprises the step of mechanically pressing the closed and pressure-reduced package; the said packaging is rejected if a pressing of more than 15% occurs during the pressing, characterized in that the pressing takes place by means of a Stamp, and at a mechanical pressure of at least 4,000 Pa and a maximum of 80,000 Pa, which Stamp has a disc-shaped or spherical stamp surface, with a diameter of at least 2 cm and at most 8 cm. 2. The method according to any one of the preceding claims, characterized in that the pressure in the packaging is reduced to a minimum of 0.3 bar and a maximum of 0.8 bar. The method according to any one of the preceding claims, characterized in that the packaging comprises an airtight and liquid-tight foil material. The method according to any one of the preceding claims, characterized in that the packaging comprises a polymer. The method according to any one of the preceding claims, characterized in that the package comprises polyethylene (PE). The method according to any one of the preceding claims, characterized in that the receiving opening is closed airtight and liquid-tight. The method according to any one of the preceding claims, characterized in that the receiving opening is closed thermally. The method according to any one of the preceding claims, characterized in that the pressure in the package is reduced prior to closing the receiving opening. BE2017 / 5305 The method according to any one of the preceding claims, characterized in that lowering the pressure in the package comprises the step of introducing one or more suction sins into the filled package. The method according to any of the preceding claims, characterized in that lowering the pressure in the package comprises the step of housing the filled package in an environment at a reduced pressure. The method according to any one of the preceding claims, characterized in that the pressure-reduced package is shaken and / or vibrated. 12. The method according to any one of the preceding claims, characterized in that the closed and pressure-reduced package is rolled. The method according to any one of the preceding claims, characterized in that the closed and pressure-reduced package is stacked on a pallet. A bag-shaped package comprising a powdery and / or granular Material, which material is packaged in said packaging via the method according to any one of the preceding claims, characterized in that when the packaging is pressed mechanically again, under a mechanical pressure of at least 4000 and at most 80000 Pa, the compression of said packaging maximum 15%. 2017/5305 16 BE2017 / 5305 METHOD FOR PACKING POWDERS AND GRANULATES