EP3366604A1 - Multilayer bag - Google Patents

Abstract

Sack (10) for bulk material such as cement, gypsum, granules, animal feed or the like, formed from a two- or multi-ply, sheet material, in particular paper and / or plastic, wherein the bag has two opposite bottoms (20, 30) and a Having between the bottoms extending side wall (40). A stabilization bond (50) is present between at least one pair of adjacent material layers of the sheet material, which glues adjoining sides of the two adjacent material layers, wherein the stabilization bond (50) is at least formed in the region of the side wall (40) and / or continuous or in sections along one or more of the bottom edges (35, 36) formed by the coincidence of bottoms (20, 30) and side wall (40), on the side wall side and / or on the side of the bottom.

Description

The invention relates to a bag for bulk material such as cement, gypsum, granules, animal feed o. Ä., Which is formed from a two- or multi-layer, sheet material, preferably paper and / or plastic.

Such bags are well known and are used in particular for the packaging and distribution of fine-grained bulk material such as cement, gypsum, granules, animal feed, o. Ä. used. The usual sizes are 5 kg, 10 kg and 25 kg. A multilayer bag is z. B. in the DE 20 2014 000 194 described.

For the production of such bags are usually material webs of the sheet material, for. B. paper webs, put on each other in a hose machine and closed to form an endless tube, which is then cut into pieces of suitable length, from which finally the bag is formed, for example by way of a cross or block bottom fold. Directly along the cut edges of the pieces of tubing, a strip-like transverse bonding is usually applied between the webs of material in order to prevent the layers of material from shifting relative to one another during the further production of the bag. Towards the end of the sack manufacturing process, the bottom fold is usually fixed by a suitable bond.

For reasons of appearance and ease of handling, it is often desirable that the filled sacks have a particular shape, e.g. B. cuboid shape. Due to the flexibility of the bag material and the mobility of the contents previously known sacks in the filled state keep their shape partially inadequate. Thus, previously known z. B. sacks to, as in FIG. 1 shown - eg. B. bulge in the middle and / or take a bulbous shape. Furthermore, there is the problem in previously known multi-layered bags that forces acting on the outside of the bag material alone have to be intercepted in the outer layer, since an introduction of force into the inner bag layers is not or only inadequately carried out. Therefore, a relatively strong and therefore generally more expensive material layer must be used as the outer layer.

It is therefore an object of the present invention to propose a two-layered or multi-layered sack with improved stability, in particular improved dimensional stability, and a method for producing such a sack.

According to the invention the object is achieved by a bag with the features of claim 1, and a bag with the features of the independent claim 7. For bag production, a method with the features of the independent claim 8 is proposed according to the invention. Advantageous embodiments are the subject of the dependent claims.

According to the invention, stabilizing bonds are present between at least one pair of adjacent layers of material, which bond together abutting sides of the two adjacent layers of material of the sheet material and increase the stability, in particular the shape and / or fracture stability of the bag. Stabilizing bonds are adhesions which are applied in areas in which the material layers of previously known sacks are usually loosely placed on one another, the stabilization bonds ensure that adjacent material layers are not displaced against each other and that forces can be introduced from one material layer into the neighboring material layer. Both increase the stability of the bag. Due to the fact that material layers are less displaceable relative to each other, the bag has an increased dimensional stability. The transfer of forces from one material layer into the adjacent material layer leads to the fact that attacking forces can be absorbed by several layers of material, which likewise increases the stability, in particular the tear strength of the bag. Advantageously, the stabilization bonding is formed at least between the outermost material layer and the next inner material layer, so that forces acting on the outside of the sack can be diverted inward via the stabilization bonding.

The bag according to the invention according to claim 1 has two opposite bottoms, which are preferably formed in cross or Bodenfaltweise. In this case, one of the bottoms can be designed as a valve bottom, in which a valve tube is used to fill the bag, and the other floor as a floor. Between the bottoms, the side wall of the bag extends, which includes a front and a rear wall and two side walls in conventional cuboid sack formats, which meet at wall edges together. Furthermore, such a bag has bottom edges when the side wall meets the bottoms.

In one embodiment of the invention, the Stabilisierungsverklebung is formed in the region of the bag wall. Alternatively or additionally, the Stabilisierungsverklebung run continuously or in sections along the bottom edges, either on the side of the bag wall or on the side of the bottom or on both sides. Such a placement of the stabilizing bonds makes it possible to stabilize the sack, in particular in the region of the transition from the bottom to the side wall, to be dimensionally stabilized and / or made tear-resistant.

In a preferred embodiment of the invention, the Stabilisierungsverklebungen extend in the region of the bag wall from one bottom to the other, more preferably in one or more areas of constant width. More preferably, the Stabilisierungsverklebungen can also be formed along the running from one floor to the other wall edges of the side wall. Particularly preferably, the stabilization bonds are formed on both sides of such edges, which increases the dimensional stability of these wall edges. In these embodiments, the Stabilisierungsverklebung may be formed in the extending from one to the other floor areas continuously or in sections. Suitably, the areas of stabilization bonding are strip-shaped areas of a few centimeters wide.

In a further preferred embodiment, the Stabilisierungsverklebungen are formed in the shape of a stripe or check pattern. On the one hand, a good bonding of the material layers can be achieved on the other hand, but on the other hand, the adhesive surface in the adhesive areas is not continuous, but interrupted, d. H. Adhesive-free surface areas remain, which furthermore allow a good venting of the bag, in particular during the filling of the bag.

According to a further preferred embodiment, a strip or check pattern is present as Stabilisierungsverklebung in the entire region of the side wall, which can further extend over the bottom edges away in the bottom area. Thus, a particularly good dimensional stability of the bag can be achieved, as well as a large-scale introduction of forces from the outer material layer in the material layer located further inside.

It is also possible to form a solid surface of the Stabilisierungsverklebung as a continuous adhesive surface. This allows a particularly good dimensional stability can be achieved, however, the venting of the bag through the bag walls in this embodiment, if necessary, severely impaired, so that care must be taken for the venting of the bag during the filling in another way.

In another preferred embodiment, a floor is provided with a carrying handle. In such a bag, the forces originating from the carrying handle must be introduced into the bag. In this embodiment, the Stabilisierungsverklebung invention is designed such that the forces originating from the handle are particularly well introduced into the bag, so that increases the tensile strength of the bag against the forces introduced by the handle. This can be done in particular by the Stabilisierungsverklebungen along the bottom edges formed by the coincidence of the handle bottom and side wall are formed on both sides on full length preferably a few inches wide. Thus, it is possible to dispense with an additional glove of a handle provided with a known in the prior art. In the same way, of course, it is conceivable to provide a surface of the side wall of the bag, preferably a narrow side of the side wall, with a carrying handle and to initiate the forces originating from this carrying handle by suitable design of the stabilization bonding in the bag.

According to another preferred embodiment, at least one of the layers of material, preferably the two adjacent layers of material made of paper, coated paper or a paper-like material is formed. Material layers of paper allow, as known, a particularly good ventilation of the bags during filling, which can be well maintained even when forming the Stabilisierungsverklebungen as a stripe or check pattern.

The bag of the invention according to claim 7 is made of a two- or multi-layer, preferably rectangular blank of sheet material, in particular paper and / or plastic, wherein between at least one pair of adjacent layers of material of the sheet material, the Stabilisierungsverklebung is formed, the abutting sides of the glued together two adjacent material layers. The stabilization bonding is at least also in a region which is at least 1 cm, preferably at least 3 cm, and more preferably at least 5 cm from edges of the blank is. Also in this embodiment, the stabilization bonds preferably run along the edges of the bag body, in a continuous or sectional manner, on one side or on both sides.

The invention equally includes bags in which the sheet material is partially single layer, z. B. in marginal areas of the bottom fold. Decisive is the multi-layer in the areas of Stabilisierungsverklebungen so that each bag with multiple layers in the field of Stabilisierungsverklebungen invention.

The inventive method according to claim 8 is based on the previously known use of a tube machine in the bag production. In this case, material layers of a sheet-like sheet material, in particular paper and / or plastic, are laid on one another in a tubular machine, and the material web is closed in the tubular machine to form an endless tube, which is cut into tube sections. According to the invention, it is provided to apply stabilizing bonds in the tubular machine which bond together mutually adjacent sides of two adjacent layers of material of the sheet material. The Stabilisierungsverklebung is applied at least in areas that are at least 1cm, preferably at least 3cm and more preferably at least 5cm from the ends or cut edges of the tube sections spaced. In other areas, in particular the edge strips of the tube sections, also adhesions may be located.

Preferably, the Stabilisierungsverklebung is applied before stacking the layers of material and / or shaping of the web to the endless tube.

In a preferred embodiment, the Stabilisierungsverklebung is applied in the form of a stripe or check pattern or as a continuous adhesive surfaces.

The preferred application of the Stabilisierungsverklebung by way of Düsenbeleimung is particularly easy to implement in the manufacturing process. Advantageously, in the case of stabilization bonding with a striped pattern, the strips of a strip pattern are applied in the longitudinal direction of the material web. This makes it possible to apply the Stabilisierungsverklebung exactly by controlled operation of glue nozzles in a simple manner. The stabilization bonds are preferably applied along the wall and / or bottom edges of the later bag body.

More preferably, the bag is formed with trays formed in cross or block bottom folding manner, and the Stabilisierungsverklebung is applied in the tube machine in the area of the later Seitenfalzlinien the bottom fold and / or wall edges of the bag. The side fold lines form the bottom edges in the later sack. Particularly preferred is an application of Stabilisierungsverklebung both sides of such edges, particularly preferably in the same width strip-shaped areas, for. B. in 2cm, 3cm, 4cm or 5cm wide strips. Thereby, the dimensional stability and rigidity of the bag can be increased, especially in the edge regions.

Further advantages and features of the invention will become apparent from the following explained with reference to figures embodiment.

Fig. 1:

Eine schematische Ansicht eines gefüllten Sackes gemäß Stand der Technik mit Verformung des Sackkorpus

Fig. 2:

Eine schematische Draufsicht auf einen erfindungsgemäßen Sack mit in Kreuzbodenfaltweise gebildetem Ventil- und Standboden

Fig. 3:

Eine Draufsicht auf den geöffneten Boden eines erfindungsgemäßen Sackes bei Kreuzbodenfaltweise

Fig. 4:

Eine schematische Ansicht eines erfindungsgemäßen gefüllten Sackes ohne Verformung des Sackkorpus mit Stabilisierungsverklebungen

Fig. 5:

Eine schematische Ansicht eines erfindungsgemäßen Sackes mit teilweise ausgeschnittener äußerer Materiallage

Fig. 6:

Eine schematische Ansicht der Endlos-Papierbahn zur Herstellung eines erfindungsgemäßen Sackes mit bereichsweiser Stablisierungsverklebung

Fig. 7:

Eine schematische Ansicht eines zweilagigen Papierzuschnitts zur Herstellung eines erfindungsgemäßen Sackes mit Stabilisierungsverklebung in Streifenmuster

Fig. 8:

Eine Draufsicht auf den geöffneten Boden eines erfindungsgemäßen Sackes mit Stabilisierungsverklebung im Bereich der Bodenkanten

Fig. 9:

Eine schematische Ansicht eines teilweise zugeklappten Bodens eines erfindungsgemäßen Sackes mit Stabilisierungsverklebungen im Bereich der Bodenkanten

Fig. 10:

Einen zugeklappten Kreuzboden eines erfindungsgemäßen Sackes mit Stabilisierungsverklebungen im Bereich der Bodenkanten

Show it:

Fig. 1:

A schematic view of a filled bag according to the prior art with deformation of the bag body

Fig. 2:

A schematic plan view of a bag according to the invention with formed in Kreuzbodenfaltweise valve and floor

3:

A plan view of the open bottom of a bag according to the invention in Kreuzbodenfaltweise

4:

A schematic view of a filled bag according to the invention without deformation of the bag body with Stabilisierungsverklebungen

Fig. 5:

A schematic view of a bag according to the invention with partially cut out outer material layer

Fig. 6:

A schematic view of the endless paper web for the production of a bag according to the invention with area-wise Stablisierungsverklebung

Fig. 7:

A schematic view of a two-ply paper blank for producing a bag according to the invention with Stabilisierungsverklebung in stripe pattern

Fig. 8:

A plan view of the open bottom of a bag according to the invention with Stabilisierungsverklebung in the region of the bottom edges

Fig. 9:

A schematic view of a partially folded bottom of a bag according to the invention with Stabilisierungsverklebungen in the region of the bottom edges

Fig. 10:

A folded cross bottom of a bag according to the invention with Stabilisierungsverklebungen in the region of the bottom edges

FIG. 1 shows a filled sack 8 according to the prior art, which is deformed by the load and displaceability of the contents and differs from a parallelepiped deviating particular halfway between the two bottoms and approximates to an oval shape, ie to an oval cross-section.

FIG. 2 shows a bag 10 according to the invention with a floor 20 and a bottom plate 30 into which a valve tube 12 is inserted for filling the bag. Between the bottoms 20, 30, the bag wall 40 extends. In FIG. 1 both stand base 20 and valve bottom 30 are folded onto the front or front wall of the bag wall 40. Not recognizable is the back or rear wall of the bag which lies under the front wall. The floor and the bottom of the valve are formed in Kreuzbodenfaltweise and each provided with a cover sheet 21, 31. The bag 10 is made of two-ply paper, wherein the inner paper ply in the outer view according to FIG. 1 is not recognizable.

FIG. 3 shows the open valve bottom 30 of a bag 10 according to the invention in Kreuzbodenfaltung, wherein no valve tube is used. The cross bottom fold forms the two corner stops 32 and 33, and the side flaps 38 and 39, which are closed to close the bottom to the Seitenfalzlinien 35 and 36 as indicated by the arrows a and b. In the finished sack the Seitenfalzlinien form bottom edges 35, 36 of the bag.

FIG. 4 shows a filled bag according to the invention with Stabilisierungsverklebungen 50 between the outer and the inner paper layer, which holds the desired cuboid shape in the filled state much better. The areas of stabilization bond 50 are in FIG. 4 shown dotted.

FIG. 5 shows the sack FIG. 4 , wherein the outer material layer in the region of the side wall 40 is partially cut out. In the region of the detail, the view is released on the inner paper layer and the stabilization adhesive 50 applied thereto in the form of a stripe pattern. In this embodiment, the Stabilisierungsverklebung extends from the valve bottom to the floor, in continuous areas of constant width on both sides along the wall edges 42 of the bag wall 40. Furthermore, the Stabilisierungsverklebung 50 extends on both sides along the Seitenfalzlinien or bottom edges 35, 36 of the bag wall. With this arrangement of Stabilisierungsverklebungen a particularly good stabilization of the bag 10 can be achieved. Due to the Stabilisierungsverklebung along the wall edges 42, the two paper layers in this area can no longer move against each other. Thus, the bulge of the bag in the region of the wall edges 42 can be avoided or reduced. In addition, forces can be derived from the outer paper layer to the inner paper layer in the region of the more heavily stressed edges, which increases the tensile strength and stability of the bag. Conversely, in this area also caused by the internal pressure of the filling material forces can be better transferred to the outer paper layer. Furthermore, the bag is according to FIG. 5 also circumferentially stabilized along the bottom edges 35, 36, which also leads to increased dimensional stability and increased tensile strength in these areas. The Stabilisierungsverklebung can as in Figure 5 and 5a shown as a striped pattern, or alternatively as in FIG. 5b shown as a checked pattern. The adhesive lines of the strip or check pattern are preferably 1 mm to 2 mm wide, and the line spacing is preferably in the range of a few millimeters.

FIG. 6 shows the endless paper web for producing a bag according to the invention. In the dotted area 50, the stabilization bond is applied. In dashed lines, the contour of the bottom fold is shown, with the Seitenfalzlinien and later bottom edges 35, 36. The paper areas which later form the standing and valve bottom are marked 20 and 30, the paper area which forms the bag wall with the reference numeral 40th Wie it can be seen, the Stabilisierungsverklebung 50 is applied in strip-shaped areas along the later bottom edges and wall edges of the bag. The edges of the strip-like areas of the stabilizer bond are parallel to the bottom and wall edges, and preferably the edges of the stabilizer bond areas are a few centimeters, more preferably 3 cm from the bottom and wall edges.

FIG. 7 shows a two-ply paper blank for producing a bag according to the invention, in which - FIG. 5 shown - the Stabilisierungsverklebung 50 is applied in the form of a stripe pattern along the wall edges and the bottom edges of the bag. The strips of the strip pattern run in the longitudinal direction of the web-shaped material, which is also the conveying direction in the tube machine. This makes such a pattern particularly easy be applied by a time-controlled Düsenbeleimung. The Stabilisierungsverklebung 50 consists of wide strip-shaped areas which extend on both sides and parallel to the wall and floor edges and thus stabilize in particular the edge regions of the bag.

FIG. 8 As can be seen there, the Stabilisierungsverklebung 50 extends on both sides of the Seitenfalzlinien 35, 36 of the bottom fold and the valve bottom towards the floor along the wall edges of the bag wall to both the bottom area as also to stabilize the bag wall.

FIG. 9 shows the in FIG. 8 open valve bottom partially, FIG. 10 completely closed. As can be seen in the figures, the stabilization bonding takes place in the in FIG. 10 shown, closed valve bottom on both sides parallel to the bottom edges 35, 36th

With the Stabilisierungsverklebung 50 invention, an increase in the stability of the bag is achieved, both an increase in dimensional stability and an increase in tear strength, because the individual layers of material are less mutually displaceable and initiated at the outer layer of the bag attacking forces in more material layers lying inside can be.

Thus, the invention allows the production of optically higher quality bags, which also allow an orderly pallet image when stacked on pallets, and which are at the same time of higher quality, in particular have a higher tensile strength.

Claims (13)

Sack (10) for bulk material such as cement, gypsum, granules, animal feed or the like, formed from a two- or multi-ply, sheet material, in particular paper and / or plastic, wherein the bag has two opposite bottoms (20, 30) and a comprising between the bottoms extending side wall (40), characterized in that between at least one pair of adjacent layers of material of the sheet material Stabilisierungsverklebung (50) is present, the adhering sides of the two adjacent layers of material glued together, the Stabilisierungsverklebung (50) is at least formed i) in the area of the side wall (40)
and or ii) continuously or sectionally along one or more of the bottom edges (35, 36) formed by the meeting of bottoms (20, 30) and side wall (40), on the side wall side and / or on the side of the bottom. Sack according to claim 1 with a Stabilisierungsverklebung in the region of the side wall, which is formed continuously or in sections in one or more of a bottom (20) to the other bottom (30) extending, preferably strip-shaped areas of the side wall (40). Sack according to claim 2, characterized in that the Stabilisierungsverklebung continuous or sectionally on one or both sides along one or more extending from one bottom to the other bottom wall edges (42) of the side wall is formed. Sack according to one of the preceding claims, characterized in that the Stabilisierungsverklebung (50) is formed at least partially in the form of a stripe or check pattern, preferably as a the entire area of the side wall and / or the entire floor area covering stiffening or check pattern. Sack according to one of the preceding claims, characterized in that a bottom is provided with a carrying handle, and the Stabilisierungsverklebung is formed such that it increases the tensile strength of the bag against the forces introduced by the handle. Sack according to one of the preceding claims, characterized in that at least one of the layers of material, preferably the two adjacent, bonded to the Stabilisierungsverklebung material layers, made of paper, coated paper or a paper-like material. Sack (10) for bulk material such as cement, plaster, granules, animal feed or the like, produced from a two- or multi-layer, preferably rectangular blank of sheet material, in particular paper and / or plastic, characterized in that between at least one pair of a stabilization bond (50) is present on adjacent layers of material of the sheet material, the adjoining sides of the two adjacent layers of material glued together, wherein the Stabilisierungsverklebung (50) is in a range of edges of the blank at least 1 cm, preferably at least 3 cm and more preferably at least 5 cm apart. Method for producing a bag (10) for bulk materials such as cement, gypsum, granules, animal feed, or the like from a two- or multi-ply sheet-like sheet material, in particular paper and / or plastic, in which the material layers are stacked in a tube machine and the material web is closed in the tube machine to form an endless tube and cut into tube sections, characterized in that in the tube machine Stabilisierungsverklebung (50) is applied, the adhering sides of two adjacent layers of material of the sheet material with each other, wherein the Stabilisierungsverklebung is in a range from the ends of the tube sections at least 1 cm, preferably at least 3 cm and more preferably at least 5 cm is spaced. Method according to the preceding claim, characterized in that the application of the Stabilisierungsverklebung before stacking the layers of material and / or the formation of the web to the endless tube takes place. Method according to one of the two preceding claims, characterized in that the Stabilisierungsverklebung is applied in the form of a stripe or check pattern or as a continuous adhesive surface. Method according to one of the three preceding claims, characterized in that the Stabilisierungsverklebung is applied by way of a Düsenbeleimung. Method according to one of the four preceding claims, characterized in that a Stabilisierungsverklebung is applied with stripe pattern, wherein the strips of the pattern extend in the longitudinal direction of the material web. Method according to one of the five preceding claims, characterized in that the bag with two opposite, preferably formed in cross or block bottom folding manner and an extending between the floors side wall (40) is formed, wherein the Stabilisierungsverklebung (50) is at least formed i) in the region of the side wall (40), preferably continuously or sectionally in one or more, preferably strip-shaped and / or along the wall edges (42) of the side wall (40) extending from one bottom (20) to the other bottom (30) areas
and or ii) continuously or in sections along one or more of the side fold lines of the bottom fold on the side wall side and / or on the side of the bottom.

Images