DE102020121095A1 - Method for manufacturing a packaging sack, packaging sack and use of a packaging sack - Google Patents

Abstract

The invention relates to a method for producing a packaging sack (22), with the steps: a) providing a material web (2), b) folding the material web (2) along a first extension of the material web (2), so that a fold (4) is obtained, which divides the material web (2) into a first web part (6) and a second web part (8), the web parts (6, 8) each having a first side edge (12, 14) and a second side edge (16, 18 ) and the side edges (12, 14, 16, 18) extending away from the fold (4), and c) forming tabs (26) on the first side edges (12, 14) and tabs (26) on the second side edges (16, 18) and connecting the flaps (26) to form cross bottoms (24) which are open on one side and form the side walls of the packaging sack (22).

Description

The invention relates to a method for manufacturing a packaging sack. Packing bags are made from different materials, such as paper or plastic. They can be used to hold piece goods, such as spare parts or hygiene items, but also to hold bulk goods, for example building materials such as cement or the like.

A web of material is usually used to produce such a packaging sack, in which two opposite edges are glued to form a tube. This is open on two sides. A bottom for the packaging sack is then formed at one of the open ends, for example by folding a so-called cross bottom and gluing the resulting tabs. The remaining opening is initially left open and serves as a filling opening for filling in the goods to be packaged. The side opposite the filling opening is therefore usually defined as the bottom of the sack. The width of such a packaging sack according to the prior art therefore runs along the folded bottom and the length from the bottom to the filling opening. The bottom width is the distance between the two folds of the flaps of the cross bottom. After the packing sack has been filled, this opening is also closed, for example by gluing or sewing the front and back of the sack. The side walls of such a packaging sack are simply formed by sections of the tube previously produced. Such sacks are usually dimensioned in such a way that the bottom surface and top surface of the sack, ie where the filling opening was previously formed, are significantly smaller than the front and back of the sack. In addition, they are usually also smaller, especially because they are significantly shorter than the side walls. As a result, the filling opening is smaller in cross-section than the side walls or the front and back.

The disadvantage here is that the hose must first be formed in one work step. Glue is required for this. In addition, this must dry after gluing, which increases the production time of such a sack. In addition, the goods to be filled in are filled in via the side that has the smallest cross-section. This makes it difficult to pack larger and possibly bulky cargo.

It is therefore the object of the present invention to provide a packaging sack which is simple to manufacture and easier to fill.

The invention achieves the object by a method for producing a packaging sack, with the steps a) providing a web of material, b) folding the web of material along a first extension of the web of material, so that a fold is obtained which divides the web of material into a first web part and a second divides the web part, the web parts each having a first and a second side edge and the side edges extending away from the fold, and c) forming tabs on the first side edges and tabs on the second side edges and connecting the tabs to form cross bottoms open on one side, form the side walls of the packing sack.

This method gives a packaging sack which has a filling opening arranged on one side. The filling opening preferably extends along the longest side of the packaging sack. As a result, large and bulky piece goods can also be safely and easily placed in the packaging bag. In contrast to the conventional production methods, no closed tube is required in the production of the packaging sack according to the invention, which would first have to be produced in a separate work step.

To produce the packaging sack, a web of material is first provided. According to one embodiment of the invention, the web of material is formed in one layer. However, it is possible and advantageous in certain embodiments if the web of material is formed in multiple layers, in particular in two, three or four layers. The layers can consist of the same material or different materials.

The web of material is preferably formed as a blank, for example from a stock web of material stored on bales or rolls. This preferably takes place fully automatically. The stock material web is preferably printed before it is cut to size.

According to a preferred embodiment, the material web is rectangular, which always also includes the material web being square. Of course, a web of material is a three-dimensional body. However, the usually very small thickness of the material web in relation to its width and length is negligible, so that one can speak of a rectangular material web. However, this does not necessarily mean that the material web has to be mathematically exactly rectangular, which is however preferred. Due to unavoidable manufacturing tolerances, it is possible that the individual edges are not exactly parallel to one another or that the angles at the corners are not exactly 90°. Such manufacturing tolerances are expressly included. Even with angle deviations of up to 5%, in particular up to 1% is still a rectangular web of material according to the invention. A rectangular web of material within the meaning of the invention is also preferably present when the corners of the web of material are rounded or bevelled.

The material web has two longitudinal edges, which run along a longitudinal extent of the material web, and two transverse edges, which run in particular perpendicularly thereto and which correspondingly run along a transverse extent of the material web. The length of the material web along the longitudinal extension is preferably greater than along the transverse extension.

The web of material consists, for example, of a plastic, in particular a plastic film. It is also possible that the web of material is based on a plastic or a plastic film and is additionally provided with another material, for example a coating.

According to a preferred embodiment, the web of material is paper-based, in particular it consists of paper. Various types of paper can be used for this. it is preferably a kraft paper, in particular so-called sack kraft paper. The paper preferably has a grammage of 25 to 100 g/m 2 , in particular 30 to 70 g/m ² . Multi-ply papers, which consist of several layers of paper, can also be used to produce a stronger packaging sack. Alternatively or additionally, the paper can also be provided with a coating or with a layer made of another material, for example plastic. Then it is a paper-based web of material. As a result, the packaging sack can be adapted to the requirements placed on it and to the goods to be filled. For example, a water-repellent film or coating can be used. In addition, coatings or foils can also be used which are food-safe and can be advantageous when using the packaging sack for food. Material web and/or coating can alternatively or additionally be provided with small ventilation holes in order to facilitate gas exchange and ventilation.

In step b), the material web is preferably folded along its transverse extension. Alternatively, it is also possible for the material web to be folded along its length. Folding creates two web parts which are separated from one another by the fold formed during folding. The two web parts each have a first side edge and a second side edge. These extend away from the fold and are preferably parallel.

The first and second side edges are in particular each formed by sections of the longitudinal edges or the transverse edges. When the web of material is folded along its transverse extent, the first and second side edges are formed by the longitudinal edges of the web of material. The first side edge of the first web part and the first side edge of the second web part are formed from the same longitudinal edge, for example the left edge of a material web in plan view. The second side edges are then formed by the opposite longitudinal edge, ie the right edge in this example. When the web of material is folded along its length, the side edges are formed by the transverse edges in the same way.

According to one embodiment of the invention, the web of material is folded in the middle. This means that the first and the second track part have the same length and are preferably congruent. The fact that both have the same length means in particular that the first side edges and the second side edges are each of the same length. The same length is also given if the maximum length of the web parts, calculated from the fold and perpendicular to it, is the same.

According to a preferred embodiment, the web of material is folded in step b) in such a way that the first web part has a protruding part that protrudes beyond the second web part. When the web parts are in the folded state, the first web part thus protrudes beyond the second web part and is in particular longer than the latter. This creates a part that protrudes over the second web part. The protruding part preferably runs over the entire width of the second web part and has a length, in particular perpendicular to an edge of the second web part over which it protrudes, of 10-100 mm, in particular 40-80 mm, more particularly 20-40 mm. The first web part is preferably correspondingly 10-100 mm, in particular 40-80, more particularly 20-40 mm longer than the second web part.

The protruding part can, for example, serve as a cover flap for the packaging sack or be folded over and reinforce the packaging sack in the area of the filling opening.

At least one recess is preferably made in the protruding part. This preferably takes place after folding in step b). However, it is also possible within the scope of the invention for the at least one recess to be made in the material web before folding in step b). This then takes place in an area of the material web which, after folding, forms the protruding part of the first web part. Which after the fall ten the first web part and which is the second web part is predetermined in this case by the at least one recess. It is also possible that the at least one recess is already present in the material web provided in step a).

At least two recesses, in particular exactly two recesses, are preferably made in the protruding part or are arranged in it.

The at least one recess is or is formed, for example, as a hole or slot, in particular as a cross slot. The introduction takes place, for example, by punching, by means of a laser or by other suitable measures.

The at least one recess makes it easier to position the packaging bag when it is filled or when it is packed after manufacture. For this purpose, eyelets or sleeves can be inserted into the at least one recess. This can be done manually or automatically and, for example, individually for each web of material or each packaging sack.

After step c), several packaging bags are preferably stacked in such a way that the at least one recesses overlap. At least one sleeve is then introduced into the at least one recess in such a way that it connects the packaging sacks to form a stack of sacks. The formation of the stack of sacks is preferably part of the manufacturing process of the packaging sack.

The sleeve is preferably made of a plastic and can also be referred to as a plastic coil. Preferably the sleeve has a through hole for receiving a wire, peg or rod which can be used for positioning. In this way, the packaging bag according to the invention can be used as a so-called wicket bag.

The sleeve is preferably dumbbell-shaped. The sleeve is preferably constructed in several parts, in particular in two parts. A two-part sleeve consists of a lower part and an upper part. The lower part is designed, for example, as a hollow cylinder, at one end of which a plate-shaped projection is formed or formed. The upper part and the lower part can be fixed to one another and for this purpose in particular have positive-locking elements that correspond to one another. In order to introduce the sleeve into the recesses, the hollow cylinder is guided through the overlapping recesses in the packaging sacks. The upper part is then fixed to the other end of the lower part. The upper part preferably has the shape of a plate or a mushroom head, so that the packaging sacks cannot slip off the hollow cylinder when the sleeve is in the assembled state

After folding in step b), cross bottoms that are open on one side are formed on the first and second side edges. This means that the first side edge of the first web part is connected to the first side edge of the second web part to form a cross bottom. The second side edge of the first web part and the second side edge of the second web part are also joined to form a cross bottom.

Cross bottoms are known in the prior art. They are usually used with the hoses used in order to close them to form a sack bottom. A tube has two side edges that are closed when it is not unfolded but lying flat. If cross bottoms are then formed at the open side edges, those on the sides are delimited by the closed edges and a closed cross bottom is created. Within the scope of the invention, however, cross bottoms which are open on one side are formed. This happens because the folded web of material has only one closed edge, namely where the fold is located. Unlike a hose, the other end of the web of material is open.

A cross bottom that is open on one side can be formed by folding. For this purpose, for example, the corners are grasped at the closed edge and folded inwards between the first web part and the second web part. This creates two tabs, one on the first panel and one on the second panel. These tabs are folded at least partially over one another and connected to one another. This is preferably done by gluing or gluing, but can also be done by riveting or clamping or the like. In addition, it is possible to first make cuts in the web parts in order to then obtain tabs for forming the cross bottom that is open on one side. These cuts are made, for example, after the folding and/or are already present at least partially, in particular completely, in the web of material provided.

After connecting the tabs, the cross bottoms open on one side each form side walls of the packaging sack. Since the term cross bottom is common for this type of closure, it will continue to be used in the present case, even if the cross bottoms form side walls of the packaging sack here. The bottom of the packing sack is where the fold is formed. In order to get a wider bottom, the packing sack can be at the bottom be unfolded, so that the bottom has in particular the same width as the cross bottoms open on one side. The fold then runs in particular centrally along the base. The unfolding of the bottom can be part of the manufacturing process of the packing sack. However, it is also possible for this to take place later, for example by a filler of the packaging sack.

The cross bottoms are preferably designed in such a way that they have the same cross bottom width. However, it is also possible and advantageous in certain embodiments if the cross bottoms are folded differently so that they have different cross bottom widths. This is advantageous, for example, when the packaging sack is designed to accommodate asymmetrical packages.

At least one so-called bottom paper is preferably applied, in particular glued, to one or both of the cross bottoms that are open on one side. This serves to reinforce and conceal the folds and edges of the flaps. It is also possible to apply such paper not only to the outside of the one-sided cross bottoms, ie where the finished packaging sack has its outsides, but alternatively or additionally to the insides as well. The base paper applied to the outside preferably has carrying handles or straps that can be used as carrying handles.

The filling opening of the packaging sack is located opposite the unfolded base. This extends over the entire width of the sack, which makes it easier to fill with large and/or complex piece goods. Filling with bulk materials is also made easier, since the cross-section of the filling area is significantly larger than with conventional bags of the same size, making filling easier and faster.

The packaging sack obtained preferably has a width of 160 mm to 650 mm. The width of the sack is defined identically as in the prior art, namely it is the extension along the bottom, ie the part of the packaging sack opposite the filling opening. However, it should be noted that in the prior art the cross bottom also forms the bottom of the packaging sack. In the present case, however, the cross bottoms, which are open on one side, form the side surfaces. The width of the sack according to the invention thus extends along the first fold formed. The length of the sack according to the invention thus corresponds to the length of the cross bottoms, which are open on one side, from the bottom to the filling opening. Lengths and widths are preferably measured in the folded state and not in the unfolded state of the sack. The length of the packing sack is preferably 280 mm to 780 mm. The width of the unfolded bottom, which is in particular identical to the cross-bottom width, is preferably 50 mm to 250 mm.

With the method according to the invention it is possible in particular to realize a width of up to 260 cm on existing production machines on which a maximum width of 74 cm can be achieved. This is because - due to the method according to the invention - what is the width in the prior art is the length of the packaging sack according to the invention and vice versa.

At least one sealing element is preferably applied to the first and/or the second web part. This serves to close the packaging bag. The filling opening, which extends over the entire width of the packaging sack according to the invention, must be closed after filling in order to enclose the filling material in the packaging sack. For this purpose, at least one sealing element is applied, which is, for example, an adhesive strip with a peel-off film. Other sealing elements, such as eyelets for pulling a strap through or Velcro elements, are also conceivable.

The sealing element preferably consists of an applied coating which is applied over the entire surface or in certain areas, in particular in the form of strips or points. Exactly one strip of coating is preferably applied. The coating is preferably applied in an amount of 3 to 35 g/m ² . The coating consists, for example, at least partially, in particular completely, of an adhesive and/or a heat-sealable material. The coating preferably has a heat-sealable dispersion adhesive or consists entirely of it.

Alternatively, the closure is done by forming a sealing seam using ultrasound. In this case, a part of the packaging sack protruding beyond the sealing seam is preferably additionally separated. This is in particular the protruding part preferably produced in step b).

It is preferred, but not necessary, for the at least one sealing element to extend across one or both cross bottoms. The sealing element is preferably arranged in the area of the filling opening, which is also referred to as the sealing area, preferably in the half closer to the filling opening, in particular in the quarter of the first and/or second web part closest to the filling opening.

According to a further aspect, the invention relates to a packaging sack which is produced or can be produced using such a method.

According to a third aspect, the invention relates to the use of such a packaging sack for packaging piece goods, in particular diapers, kitchen paper rolls or toilet paper rolls. In addition, the packaging sack is preferably used for packaging spare parts, in particular from the automotive industry.

• 1 eine Ausführungsform einer Materialbahn,
• 2 die Materialbahn aus 1 im gefalteten Zustand,
• 3 eine Ausführungsform eines Verpackungssacks im zusammengefalteten Zustand in der Draufsicht,
• 4 eine perspektivische Darstellung des Verpackungssacks aus 3 im aufgefalteten Zustand,
• 5 eine perspektivische Darstellung einer weiteren Ausführungsform des Verpackungssacks,
• 6 eine Ausführungsform einer Hülse zum Verbinden mehrerer Verpackungssäcke zu einem Sackstapel, und
• 7 eine weitere Ausführungsform des Verpackungssacks im zusammengefalteten Zustand in der schematischen Draufsicht.

The invention is explained in more detail below with reference to the accompanying figures. Show it:

• 1 an embodiment of a web of material,
• 2 the web of material 1 in the folded state,
• 3 an embodiment of a packaging bag in the folded state in plan view,
• 4 a perspective view of the packaging bag 3 in the unfolded state,
• 5 a perspective view of a further embodiment of the packaging bag,
• 6 an embodiment of a sleeve for connecting a plurality of packaging sacks to form a sack stack, and
• 7 another embodiment of the packaging bag in the folded state in the schematic plan view.

In 1 a material web 2 can be seen in the plan view. The web of material 2 is rectangular. In addition, a dashed line is drawn in, which runs along the transverse extension of the material web 2 and indicates the later position of a fold 4 . When the material web 2 is folded, the fold 4 divides it into a first web part 6 and a second web part 8. In 1 It can be seen that the fold is not arranged in the middle, so that the web parts 6 and 8 are of different sizes. According to a further embodiment of the invention, the fold 4 is arranged in the middle, so that the first web part 6 and the second web part 8 are of the same size.

The web of material 2 has two longitudinal edges 10.1 and 10.2. One longitudinal edge 10.1 simultaneously forms a first side edge 12 of the first track part 6 and a first side edge 14 of the second track part. The other longitudinal edge 10.2 simultaneously forms a second side edge 16 of the first web part 6 and a second side edge 18 of the second web part 8. The first side edge 12 and the second side edge 16 are of the same length. The first side edge 14 and the second side edge 18 are also of equal length.

In 2 is the material web 2 according to 1 shown in the folded state. The material web 2 is folded around the fold 4 and the second web part 8 lies on the first web part 6. The in 2 The state shown can be achieved by turning the first web part 6 into 1 is folded backwards through the plane of the paper around the dashed line. Since the first track part 6 is longer than the second track part 8 , the first track part 6 forms a protruding part 20 which projects beyond the second track part 8 . Recesses can then be made in the protruding part 20 or this can be used to reinforce or close the subsequent filling opening.

In 3 an embodiment of a packaging bag 22 is shown in plan view. The packaging sack 22 has two cross bottoms 24 which are open on one side and each have two tabs 26 . The tabs 26 of the respective cross bases 24 overlap one another and are connected to one another, preferably glued, in these overlapping areas. The cross bottoms, which are open on one side, are shown laid flat. When filled, they are essentially perpendicular to the plane of the paper.

The fold 4 is in 3 arranged above. Correspondingly, when the packaging sack 22 is unfolded, the bottom surface of the packaging sack is located there. This is opposite the filling opening 30 of the packaging bag 22, which extends over its entire width. The cross bases 24 are designed to be closed toward the fold 4 and thus toward the bottom surface. At the opposite end, where the filling opening 30 is formed, the cross bottoms are open. The filling opening is located at the protruding part 20, which in the present embodiment is turned up for its own reinforcement. Two recesses 28 in the form of cross slots are introduced into the protruding part. These were introduced by means of punching or laser and are used to hold a sleeve 32, not shown.

A sealing element 34 is applied to the packaging sack above this. In the present case, this is a strip of a heat-sealable material that extends over the entire packaging sack, including the cross bottoms that are open on one side. This serves to be able to close the filling opening 30 of the packaging bag 22 as simply as possible after filling.

In 4 12 is a perspective view of the packing sack 22 of FIG 3 shown. For the sake of clarity, however, the above stationary part 20 with the recesses 28 and the sealing element 34 are not shown. The packaging sack 22 is unfolded so that the filling opening 30 is completely open. Opposite the filling opening is the bottom surface 36, in which the fold 4 runs in the middle. The cross bottoms 24, which are open on one side, form the side walls of the packaging bag 22.

5 shows a model of another embodiment of the packaging sack 22 in the filled state. The packaging sack 22 is presently filled with a unit load 40, namely rolls of sanitary paper. It can be seen that the packaging bag 22 analogous to the representations from the 1 and 2 was folded. Therefore, a protruding part 20 is formed. The side walls 38 of the packaging bag 22 are formed by the cross bottoms 24 which are open on one side. The tabs 26 of the cross bottoms 24 which are open on one side are each glued to one another and are also of different lengths because of the different lengths of the web parts.

6 shows a dismantled sleeve 32 for insertion into the recesses 28 of a packaging bag 22. The sleeve 32 consists of a plastic, is constructed in several parts and has a lower part 42 and an upper part 44. The lower part consists of a hollow cylinder, at one end of which a plate-shaped projection is arranged. In the present case, this is designed in one piece with the hollow cylinder. The upper part 44 and the lower part 42 have corresponding form-fitting elements for connecting the upper part 44 and lower part 42 to form the sleeve 32. When assembled, the sleeve has the shape of a dumbbell and has a through opening 46 in the middle. The sleeve connects a plurality of packaging bags 22 a pile of sacks. This stack can then be positioned simply by passing a rod or peg through the through hole 46. The packaging sacks 22 preferably each have at least two recesses 28 for receiving a sleeve 32 each. In this way, a fixed positioning can be achieved.

7 shows a schematic embodiment of the packaging bag 22. In this case, the packaging bag has no protruding part 20.

In addition, the various dimensions of the packaging bag 22 are indicated. The width B of the packing bag runs along the in 7 not shown fold 4. It is calculated in particular, as shown here, in the folded state, so that the cross-bottom widths K1 and K2 each contribute in part to the width of the packaging sack. The cross base widths K1 and K2 can be selected to be identical, which corresponds to a preferred embodiment. However, it is also possible and advantageous in certain embodiments if these are selected differently. This is advantageous, for example, when packaging asymmetric packages as precisely as possible.

The length L runs along the cross bottoms 24, which are open on one side, and in particular perpendicular to the width B.

Reference List

2

web of material

4

fold

6

First track part

8th

Second track part

10

long edge

12

First margin of the first part of the web

14

First side edge of the second web part

16

Second side edge of the first web part

18

Second side edge of the second web part

20

protruding part

22

packing sack

24

Cross bottom open on one side

26

tab

28

recess

30

filling hole

32

sleeve

34

sealing element

36

floor space

38

side walls

40

general cargo

42

lower part

44

top

46

passage opening

B

broad

L

length

K1

First cross bottom width

K2

Second cross bottom width

Claims (8)

Method for producing a packaging sack (22), with the steps: a) providing a material web (2), b) folding the material web (2) along a first extension of the material web (2), so that a fold (4) is obtained, the the material web (2) in a first first web part (6) and a second web part (8), the web parts (6, 8) each having a first side edge (12, 14) and a second side edge (16, 18) and the side edges (12, 14, 16 , 18) extending from the fold (4), and c) forming tabs (26) on the first side edges (12, 14) and tabs (26) on the second side edges (16, 18) and joining the tabs (26) to cross bottoms (24) which are open on one side and form the side walls of the packaging sack (22). procedure after a claim 1 , characterized in that the material web (2) is paper-based, in particular consists of paper. Procedure according to one of Claims 1 and 2 , characterized in that the material web (2) is folded in step b) in such a way that the first web part (6) has a protruding part (20) which projects beyond the second web part (8). procedure after claim 3 , characterized in that in the protruding part (20) at least one recess (28) is introduced. procedure after claim 4 , characterized in that after step c) several packaging bags (22) are stacked in such a way that the at least one recess (28) overlaps and at least one sleeve (34) is introduced into the recesses (28) in such a way that the packaging bags ( 22) to form a pile of sacks. Method according to one of the preceding claims, characterized in that at least one sealing element (34) is applied to the first web part (6) and/or the second web part (8). A packaging sack (22) which can be produced or produced using a method according to one of the preceding claims. Use of a packing sack (22) after claim 7 for packaging piece goods, in particular diapers, kitchen paper rolls or toilet paper rolls.

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