Laminated packing material creasing method, packing material and package

FIELD: equipment for making paper articles.

SUBSTANCE: package is produced of laminated packing material formed of cellulose pulp and having three-dimensional layer which gives a three-dimensional configuration to the package, and at least one side layer formed on one side of three-dimensional layer. Side and three-dimensional layers are directly or indirectly connected one to another over the full surfaces thereof facing each other. Method for package production by creasing and folding laminated packing material involves pressing creasing device in one side of laminated packing material to form crease lines and holding the packing material by supporting tool from opposite side thereof, wherein the supporting tool is substantially flat in area corresponding to area of creasing device application; folding the packing material about crease line. Above three-dimensional layer has latticed structure formed of cellulose fibers.

EFFECT: decreased thickness of obtained package, possibility to fold packing material through 180° in which total thickness of folded material is approximately equal to double unfolded material thickness.

7 cl, 8 dwg

 

The technical FIELD

The present invention relates to a method of removing the packaging laminate, made from cellulose fibers and adds volume containing layer, referred to here as the bulk layer composed of a mesh structure of cellulose fibers, and at least one side a layer at least on one side of the bulk layer, and the lateral layer and the bulk layer directly or indirectly connected to each other essentially in all its facing to each other surfaces.

The state of the art AND CHALLENGES

In the manufacture of packaging material, typically a packaging laminate is subjected to compaction by using the thrashing of the device forming the recess. Thrashing the device may be in the form of a thin line with a rounded smooth edge or in the form of forming the groove wheel with smooth rounded edge, which presses the material in a carefully executed deepening in the matrix. Because of this deepening the material is weakened by the so-called line collapse. When the crushing material out of the plane of the laminate, forming a ledge on line collapse on one side, namely, on the side opposite to that on which is formed the recess. Thus, the line of shear acts as a pressed crease, which is used for smooth folding of the material on the acceptable angle, typically 90°, but can be other bend angles, for example 180°. For materials of different quality with different properties (corresponding to the laminates of varying quality and types) are used thrashing ruler or other devices and matrices with different geometries in order to get a more pronounced pressed crease. Usually vary the thickness of the line or another thrashing device, the width of the recesses in the matrix or the depth of the collapse, i.e. the depth of the indentation thrashing.

According to the method of folding, the material is folded from the side on which it has been deepening. With the inner side of the angle formed when folded, creates a bulge. Therefore, when folded, for example, 180° the thickness of the folded laminate will be more than twice the thickness of the laminate. In the case of smaller angles in this way, buckling and folding also appear bumps along the line of collapse on the inside corner.

Causing formation of a bulge when folding conventional laminate is a fracture in compression occurring on the side, which is exposed when folded compression. The fracture increases as the bend, and a ledge formed thrashing ruler shrinks and turns into a bulge. Due to the accumulation of material at the line of folding lamina who tends otprygivat, restoring its original flat shape. This means that the folded edges are easily rounded, especially if they are under load, for example when packaging in the form of a parallelepiped squeeze in the hand or placed in several packages at each other.

Thus, the disadvantages of this method crumples conventional laminate are the displacement of the material of the plane and/or its movement to the line of folding, which leads to the appearance of convexity and increase the thickness of the folded laminate. Other related disadvantages are that due to the deformation of the bend line is not perfectly straight. In addition to the deterioration in the appearance of the packaging, this leads to the fact that packaging, which should be placed next to each other or on each other, will have a different shape. Deformation along the line of folding can cause breaks in the protective film or layer consisting, for example, of aluminum foil, plastic film, varnish, etc. for Example, if the film is deposited on one side of the laminate and the fragility of the material of the film more than cardboard laminate, bulges or other irregularities that occur when folded, can cause a crack in the plastic film layer. A special type of paper on which the printing or that require very good finishing surface can be covered with black kr is tion, varnish, etc. Thus, the dent from thrashing line may disturb the surface coating, for example to create a crack that opens below the fibrous material, if the bending is performed in the direction from the recess formed by thrashing the line.

A known solution to the problem of education convexity described in SE 467302 where the ledge is formed thrashing line, remove mechanically. However, this method has several disadvantages, for example, a decrease in strength, dust, etc.

In another known method, aimed at reducing the convexity (see SE 432918) are auxiliary lines collapse to shift material from the main line collapse.

In addition, it is well known that you can create multiple parallel lines collapse and split so one corner on multiple adjacent corners. The disadvantage of this method is that the total thickness becomes too great. For example, when folded 180° the total thickness will be much larger than twice the thickness of the laminate.

In SE 507095 described one way to remove the bulge from the line of collapse, in which there is no adhesion between the individual layers of the laminate, so they are deformed independently from each other.

In all the above examples of solutions to problems associated with the displacement of the mA is eriala on the line of folding of the result caused by the crushing deformation, characteristic is the desire to remove or displace the material from the line of folding or to avoid the accumulation of material on this line.

In EP 565013 solves the problem of another kind, and describes material consisting of several layers and having a core formed of compacted shredded paper. Said material can be performed with multiple grooves to give it flexibility, so that it can be used for wrapping objects of various shapes. However, in EP 565013 not described packaging, obtained by folding lines and crumples way or buckling in the accepted sense of the word.

In EP 484726 described as when folding compressed foam or soft binder to reduce longitudinal stresses in the layer of aluminum foil.

In EP 546956 described material having a Central layer of soft cellulose fibers to improve the machinability of the material.

From US 2770406 known packaging laminate containing porous bulk layer, which is compressed when folded. According to this document, the bulk layer is made of foam, in particular foam with closed cells. This material was considered to be very good in 1956, however, given the current environmental standards, requirements, reuse of materials, etc. currently anabsolute unacceptable. In the US 2770406 said about the fact that in this type the material of the carton in the process of packaging in the extreme layer of Kraft paper on the corners there are cracks. Thus, according to this document, the problem of cracking, solved only for a laminate consisting of cellulose fibers and plastics, and may not be resolved for a laminate consisting essentially of cellulose fibers. In addition, nothing is said about how practically is the way to collapse.

In FR 1341855 described laminate of corrugated cardboard, consisting of cellulose fibers, but different from the laminate according to the present invention by the fact that the bulk layer is not formed mesh structure of cellulose fibres, connected with a lateral layer of cellulose fibers essentially all of them facing each other surfaces. Figa-b of this application, refer it to the appropriate level of technology, which are inherent problems associated with fractures and deformations, i.e. the way crumples under figa-b presents as a way characterized by these problems. Figa-b illustrate a method of collapse, which, as stated in FR 1341855, slightly better than the method according to Figo-b, but, instead, in this proposal the solution shown in figa, which refer to the way of the collapse, where in the extreme layer of the case is t slots or perforations.

SOLUTION AND BENEFITS

The invention is directed to solving the above problems in the way that the collapse of packaging laminates, made from cellulose fibers and adds volume containing layer, referred to here as the bulk layer, and at least one side a layer at least on one side of the bulk layer, and the lateral layer and the bulk layer directly or indirectly connected to each other essentially all of them facing each other surfaces.

The invention relates to a packaging laminate having a line collapse, made this way, and packaging, manufactured by bending such a laminate. The laminate is preferably used for packaging of liquid and dry food products, and industrial and other products, or as an intermediate product for the manufacture of such material, or other end products.

According to the invention, a method is proposed for the collapse of the packaging laminate according to claim 1 of the formula.

This method is carried out using the thrashing of the device, which is pushed into the laminate with its first side, and on the opposite side of the laminate using a flat supporting tool. Supporting the tool may consist of the same stable, flat support for various types of lines and crumples. It is vital which simplifies and reduces the cost of the method both in terms of its implementation, and get dents different geometry only by changing the template in thrashing the device. In the known method crumples to modify the geometry dents need to change as a template thrashing device and the matrix.

According to one aspect of the invention, the side layer (s) is (are) on the first side of the laminate, and the lateral layer is pushed into the bulk layer along the line of collapse, and on the side opposite to the pressed layer (layers), in the zone of the line of the shear laminate remain essentially flat.

According to the method of collapse, the volume of the compacted layer in the zone of the line of shear, which gives a big advantage. The seal weakens the mesh structure, formed in the bulk layer of single pulp fibers. Due to the weakening of the mesh structure, it cannot withstand the compressive load from the side of the layer when it is next folded along the line of shear, in turn, is subjected to a compressive load. In the side layer deepens in the bulk layer. Thus, during subsequent folding is possible to avoid the problems associated with the formation of bulges, stratification and possible formation of cracks in the side layers that takes place in a known way to collapse. Such behavior of the bulk layer when the compression is particularly observed in the case of most of predpochtitelney, described in the parallel patent application SE-AO-9802967-1.

According to another aspect of the invention, the bulk layer is essentially of or consists of a sheet of paper or cardboard, which is formed separately from cellulosic fibers and then placed on the side of the layer (s) or formed directly on the side of the layer (layers). Can be used wet or dry stacking bulk material.

According to further aspect of the invention, the bulk layer contains up to 40-95% cellulose fibers having a degree of grinding is defined on the canadian standard device, from 550 to 950 ml, the density of the side of the layer (s) is greater than the density of the bulk layer, and the laminate has a coefficient of stiffness in bending, calculated as the geometric mean for the longitudinal and transverse directions, more than 2.5 Nm7/kg3but less than 14 Nm7/kg3.

According to further aspect of the invention, at least 60% of the bulk layer comprises fibers having a degree of grinding is defined on the canadian standard device, more than 600 ml, and the laminate has a coefficient of stiffness when bending more than 3.0 Nm7/kg3or, more preferably, at least 60% of the bulk layer comprises fibers having a degree of grinding is defined on the canadian standard device, more than 650 ml, most preferably at measures the 700 ml, but less than 850 ml, and the laminate has a coefficient of stiffness when bending more than 4.0 Nm7/kg3. Particularly preferably, the coefficient of stiffness of the laminate in bending was more than 5.0 Nm7/kg3.

It is desirable that the bulk layer had a density of 50-300 kg/m3preferably 70-200 kg/m3more preferably 100-180 kg/m3. The lateral density of the layer is preferably at least twice the volumetric density of the layer, preferably at least three times, most preferably at least four times. The lateral density of the layer can be 300-1500 kg/m3preferably 400-850 kg/m3. It is advisable that the main weight of the bulk layer was 30-300 g/m2preferably 40-120 g/m2the main weight side of the layer (s) comprised of 20-150 g/m2and the main weight of the laminate - 50-500 g/m2, preferably 90-200 g/m2.

Bulk layer with low density to profitably manufacture by dry or wet laying chemo-thermomechanical pulp (CTMP) or other "mechanical" fibrous mass on the basis of softwoods, such as TMM, with a high degree of grinding. On the one hand, dry laying preferred and can be used any known method of laying, but regardless of this the degree of grinding fibrous mass, as determined in canads the om standard device, should be more than 550, preferably more than 600, more preferably more than 650, and most preferably more than 700. A large degree of grinding of fibrous material for the first layer allows the sheet to shrink due to dehydration and solidification, without increasing the density to undesirable values. The composition of the bulk layer may include other fibrous raw material having a high elasticity in the wet state, such as chemically cross-linked fibers, which typically have low resistance to dehydration and high elasticity after wet pressing, however, this raw material is not preferred because of the high cost.

Other acceptable fibrous raw material is a synthetic fiber, for example of the complex polyester, policemovie and polypropylene fibers, which also have low resistance to dehydration and high elasticity in the wet state. In a preferred embodiment, the raw material for the layer with low density, forming the bulk layer, which in General is an intermediate layer in the laminate is chosen completely or essentially obtained from mechanically so-called fibrous masses with high yield, i.e. fibrous masses with the release of wood at least 75%, you can output at least 80%, such as fibrous mass of X IS MM and TMM essentially on the basis of softwood, provided that they have the above values of the degree of grinding.

To surround a layer you can add also the marriage in an amount up to 25% of dry weight. Here, marriage is understood as the rejected product from paper or cardboard laminate, crushed in liquid mass in the tie-breaker and consisting mainly of separated fibers.

Volumetric layer also contains at least one binder, preferably latex, in the amount of 1-30%, preferably 5-30%, more preferably 7-30%, and most preferably 10-20% by weight of the laminate in terms of dry weight.

According to one aspect of the invention, at least one of the lateral layers consists of bleached or unbleached sulfate, sulfite or organic cellulose, which is obtained preferably from cellulose raw materials, consisting primarily of wood soft and/or hard rock. The side layers can also contain one or more protective layers, for example layers of metal foil, preferably aluminum foil, polymeric film, metallized polymer film or varnish. Extreme layer, in particular on the front side of the laminate may consist of a film of any of the above materials with very good finishing.

If the packaging laminate has several lateral layers on Stour is not bulk layer, which deepens on line (lines) collapse, when the compaction according to the proposed method all of these side layers will be bonded in the bulk layer.

Another advantage of the invention relating to the manufacture of packaging by folding a laminate having a line collapse, made according to the invention is that the folding can be performed in the direction of the recess, forming a line collapse, and from this recess. When folding a laminate with lines collapse, obtained in a known manner buckling, bending, should always be carried out in the direction from the recessed thrashing device. Folding to deepen gives a great advantage, especially in the case of laminates, which have good finishing surface and therefore easily damaged and have to meet high requirements regarding the quality of the front surface. In this case, you can crush the reverse side of the laminate.

Description of the DRAWINGS

Hereinafter the invention is described with reference to the accompanying drawings, in which

figa-D illustrate a method of collapse of the packaging laminate,

figure 2 depicts a slightly bent packaging laminate in a known way collapse

figure 3 depicts the side of the packaging laminate with a line of crumbling under the image the structure,

figure 4 depicts the laminate shown in figure 3, after folding along the line of collapse

figure 5 illustrates the folding of the most preferred packaging laminate, crumpled according to the invention.

On figa-D shows how the collapse of conventional packaging laminate in a known manner collapse. On figa shows the compaction of the laminate by thrashing line and further explains the problems inherent in the prior art: the residual strain with the release of the material from the plane in a known way shear (pigv), the bulge/stratification on the line folding (figs) and the increase in thickness when folded 180° (fig.1D).

Figure 2 shows caused by the compression of the initial fracture in the side layer, which is subjected to a compressive load in a known way to collapse. Then the fracture will increase with subsequent formation of convexity shown in figs.

Figure 3 shows how the collapse of the packaging laminate according to the invention. Laminate adds volume contains the layer 1, the side layer 2b, located on the first side of the laminate, and two side layer 2A,3 at its second side. In this embodiment, the extreme lateral layer 3 on the second side of the laminate is a special surface layer with high quality finishing. Laminate crumple thrashing device 6, which is I line 4 collapse and in the bulk layer is compacted area 5 area 4 collapse. Thus, the lateral layer 2b is pressed down in the bulk layer 1. On the other side, where the side layers 2A and 3, the laminate remains flat due to a flat supporting tool 7 that is used in the method of collapse.

Figure 4 shows how the bending 90° line 4 collapse. It is seen that the folding is produced in the direction of the pressed layer 2b on the first side of the laminate. This means that special and fragile side layer 3 will not be damaged in any wrinkling or folding. You can also see that the line of folding does not result in formation of a bulge or a similar strain, and no delamination or cracking.

Figure 5 shows a photograph under a microscope, showing, as in the preferred laminate is the indentation of the lateral layer in the bulk layer. Figure 5 illustrates the principle of the invention, which in General terms is illustrated in figure 4.

The invention is not limited to the described variants of its implementation and allows for changes in the volume of the enclosed formula. For example, in some cases, on the side of the laminate, which is then subjected to wrinkling thrashing the device may be missing side layer and the bulk layer is compacted without pushing him in the side with the HH. In addition, it is clear that the method is not limited to the use of a laminate with the bulk layer, with certain values of the degree of grinding and certain stiffness in bending. This type of laminate is preferred for implementing the present invention.

1. A method of manufacturing packaging by buckling and folding of the packaging laminate, made from cellulose fibres, containing bulk layer (1), adds volume, and at least one side of the layer (2b) at least on one side of the bulk layer, and the lateral layer and the bulk layer directly or indirectly connected to each other essentially on all its surfaces, facing each other, comprising an indentation in the first side of the laminate thrashing device for the formation of lines (4) buckling and use on the other side of the laminate opposite to the first side of the supporting tool, which is essentially flat in the zone corresponding to the location thrashing device, characterized in that the laminate is folded on the line (4) collapse, with specified bulk layer (1) consists of a mesh structure formed of cellulose fibers.

2. A method of manufacturing a package according to claim 1, characterized in that the lateral layer (s) (2b) is (are) on the first side of the laminate, p is ICEM side layer (2b) is pushed into the bulk layer along the line of collapse and on the side opposite to the depressed side layer (layers) (2b), in the area line (4) buckling of the laminate remain essentially flat.

3. A method of manufacturing a package according to claim 1 or 2, characterized in that in the bulk layer (1) in the zone of the line (4) buckling create a reinforced structure (5), which facilitates the folding line (4) collapse essentially without the formation of bulges or delamination between layers or without the formation of cracks in one or two outer layers (2b, 3) of the laminate due to the formation of lines (4) collapse.

4. A method of manufacturing a package according to claim 1, wherein the bulk layer (1) contains up to 40-95% cellulose fibers having a degree of grinding is defined on the canadian standard device, 550-950 ml; the lateral density of the layer (s) (2b) is greater than the density of the bulk layer, and the laminate has a coefficient of stiffness in bending, calculated as the geometric mean for the longitudinal and transverse directions, more than 2.5 Nm7/kg3but less than 14 Nm7/kg3.

5. A method of manufacturing a package according to claim 1, characterized in that at least 60% of the bulk layer (1) consists of fibers having a degree of grinding is defined on the canadian standard device, more than 600 ml, and the laminate has a coefficient of stiffness when bending more than 3.0 Nm7/kg3or more preferably at least 60% of the bulk layer (1) consists of the fibers, with the degree of grinding, some on the canadian standard device, more than 650 ml, most preferably at least 700 but less than 850 ml, and the laminate has a coefficient of stiffness when bending more than 4.0 Nm7/kg3preferably more than 5.0 Nm7/kg.

6. A method of manufacturing a package according to claim 1, characterized in that the laminate is folded on the line (4) collapse towards its first side.

7. Packaging manufactured by the method according to any one of claims 1 to 6.



 

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