ES2671938T3 - Method and device for the manufacture of a band of multilayer fibrous material and band of multilayer fibrous material that is manufactured in accordance with this - Google Patents

Abstract

Process for the manufacture of a band of fibrous material (10) of several layers, particularly a cardboard or paper band, which includes at least a first and a second layer of fibrous material (12,14), characterized by the fact that this method comprises at least the following steps: - application of a first suspension of fiber material (16) on a first permeable or non-permeable conveyor belt (18) for forming a first layer of fibrous material (12); - defibration and / or insulation of the first layer of fibrous material (12) with a moisture content between 95 and 40% by weight for individual fibers and / or fiber groups (28); - forming a layer of porous fibrous material (36) by means of the individual fibers and / or fiber groups (28) of the first layer of fibrous material (12); and - superposition of the layer of porous fibrous material (36) with the second layer of fibrous material forming the band of multilayer fibrous material (10).

Description

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DESCRIPTION

Method and device for the manufacture of a band of multilayer fibrous material and band of multilayer fibrous material that is manufactured in accordance with this

[0001] The invention relates to a method for the manufacture of a band of multilayer fibrous material, particularly a cardboard or paper web, including at least a first and a second layer of fibrous material. The invention further relates to a device for manufacturing a band of multilayer fibrous material, particularly a cardboard or paper web, including at least a first and a second layer of fibrous material.

[0002] Methods and devices for the manufacture of a band of multilayer fibrous material, particularly of cardboard or paper strips, are known from the state of the art in different configurations, eg of EP 1 422 340 Al. In this case, particularly in the manufacture of cardboard, several layers of partially different fibrous material are formed separately and then pressed and progressively overlapped. However, the disadvantage of known procedures and devices is that with conventional foliation or layering, the fibers are oriented primarily in the x / y direction (two-dimensional) and only slightly in the z-direction, e.d. It is oriented in height. Thus, however, no resistance is achieved or only a little of the bands of fiber material formed of several layers in the z-direction. In addition, they present the multi-layered cardboard or paper strips manufactured by known methods and devices always having a high density with a relatively low volume.

[0003] The object of the present invention is a method and a device for the manufacture of a band of multilayer fibrous material, particularly the preparation of a cardboard or paper strip, which allows the economic manufacture of a band of material. Multi-layered fibrous with improved resistance in z-direction, as well as with increased volume with contemporary density reduction.

[0004] The object is solved according to the invention by a method with the characteristics of claim 1, as well as by a device with the characteristics of claim 10. Advantageous configurations with appropriate improvements of the invention are provided in the secondary claims, wherein Advantageous configurations of the procedure are considered as advantageous configurations of the device and vice versa.

[0005] A process for the manufacture according to the invention of a band of multilayer fibrous material, particularly a cardboard or paper web, including at least a first and a second layer of fibrous material, comprises at least the following steps : application of a first suspension of fiber material on a first permeable or non-permeable conveyor belt for forming a first layer of fibrous material; defibration and / or insulation of the first layer of fibrous material with a moisture content between 95 and 40% by weight for individual fibers and / or fiber groups; forming a porous fiber layer by means of the individual fibers and / or fiber groups of the first layer of fibrous material and overlapping the porous fiber layer with the second layer of fibrous material forming the band of multi-layer fibrous material. Through the defibration and / or isolation of the first layer of fibrous material, the fibers and / or insulated fiber groups can then form a very loose and porous fiber layer. A fiber layer with a highly porous structure can be formed with the usual and known foliation or formation of wet fibrous layers. Through the defibration and / or individualization of the first layer of fibrous material a porous fiber layer arises in which the fibers and / or fiber groups are oriented again, so that a considerable proportion of fiber alignment is also provided in z-direction.n In this way a high resistance-z thus mentioned is achieved, ed a resistance that is configured perpendicular to the plane of the band of fibrous material, which the bands of fibrous material of several known layers do not have. In addition, the porous fiber layer has a high volume with lower density. The method according to the invention results in a band of multi-layered fibrous material with high stiffness and good heat insulating characteristics.

[0006] In another advantageous configuration of the process according to the invention, the first suspension of fiber material has a moisture content between 99.9 and 96.0% by weight in a distributor mechanism associated with the first corresponding conveyor belt. In addition, the second layer of fibrous material is produced through an application of a second suspension of fiber material with a moisture content in another distributor mechanism associated with a second conveyor belt between 99.8 and 96.0% by weight on a second permeable or non-permeable conveyor belt. The moisture content mentioned has been produced as particularly advantageous for the manufacture of the first and second layers of fibrous material. The fiber material suspension contains both fibrous materials based on cellulose. In particular, they can be mechanically or chemically disintegrated pulps, particularly wood and / or cellulose substances. In addition, the recycle fibers of old paper or old cardboard can be mixed with

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suspensions of fiber material. Also a certain proportion of plastic fibers, particularly artificial and / or mineral fibers can optionally be added to the suspensions of fiber material.

[0007] In other advantageous configurations of the process according to the invention, the individual fibers and / or fiber groups of the first layers of defibrated and insulated fibrous material are mounted before overlapping with at least one other layer of fibrous material on a third band. Permeable or non-permeable conveyor for forming the layer of porous fiber material. Thus, the layer of porous fiber material can be formed as an individual layer respectively as an individual sheet. But it is also possible that the fibers and / or individual fiber groups of the first layer of defibrated and insulated fibrous material before overlapping with the second layer of fibrous material be mounted directly for the conformation of the layer of porous fibrous material. The possibility is finally that this method comprises another phase of the application of at least another third suspension of fiber material with a moisture content in another distributor mechanism between 99.8 and 96.0% by weight on at least one other conveyor belt permeable or non-permeable under the formation of another third layer of fibrous material as well as the superposition of the third layer of fibrous material with the layer of porous fiber material and / or the second layer of fibrous material. Depending on the demand of the multilayer fibrous web to be produced, the method according to the invention may vary. Thus, the layer of porous fibrous material can be applied directly to a layer of conventional formed fibrous material. In addition, there is the possibility of placing another layer of liquid fibrous material. But it is also possible that the porous fiber layer completely separated from the other layers of fibrous material is formed as an individual layer. This advantageously results in a multiplicity of possibilities of use for the layer of porous fibrous material manufactured according to the invention.

[0008] In another advantageous configuration of the process according to the invention, the second layer of fibrous material or the third layer of fibrous material is formed as a coating layer or lower of the band of multilayer fibrous material. A band of multilayer fibrous material manufactured with the method according to the invention is characterized among others because through the formation of the layer of porous fibrous material a bed of the good and uniform coating layer is achieved. In comparison with the aforementioned, for example, the bed of the coating layer is on a wave in a relatively bad and uneven corrugated cardboard.

[0009] In other advantageous configurations of the process according to the invention, the speed of the second permeable or non-permeable conveyor belt or of the third permeable or non-permeable conveyor belt is equal or unequal to the speed of the first permeable or non-permeable conveyor belt. . By adjusting the speeds of the individual conveyor belts with respect to each other, it is advantageously possible among others to control and regulate correspondingly the volume and density of the layer of resulting porous fibrous material.

[0010] The aforementioned conveyor belts may be formed at least in part as felts or sieves.

[0011] Fundamentally, it may be provided that during the manufacture of the individual fiber layers or the suspension (s) of individual fibrous material (s) additives such as binder, retention medium, filler material, colorants, are used. bleach, liquid solidifying agents and / or other additives auxiliary agents used in the manufacture of cardboard and paper, to influence the production process and the characteristics and workability of the resulting multilayer fibrous web in the desired manner. Suitable fillers are generally mineral substances, such as kaolin, talc or calcium carbonate. For the increase of the surface resistance and the resistance to the humidity can be added to the layers of fiber or the band of fiber that arises from this starch by means of a press of gluing or a bath of starch. As retention means for dehydration control during the formation of the individual fiber layers or foliation, it is possible to add to the suspensions of fibrous material, for example polyethyleneimine. As an additive, biopolymers, for example hemilcellulose, cellulose, lignin and / or polyamines, and / or polysaccharides, for example starch, starch polymers, alginates, chitin, hemilcellulose, cellulose derivatives, cellulose ester, cellulose acetate, can be used primarily cellulose, cellulose triacetate, cellulose nitrate, cellulose ether, ethyl cellulose, methyl cellulose, oxyethyl cellulose, oxypropyl cellulose and carboxymethyl cellulose. Other fundamentally usable additives include resins such as, for example, phenolformaldehyde resins, melamineformaldehyde resins, mixtures of phenolformaldehyde resins and melamineformaldehyde resins, neutral or anionic polymers, polyvinyl alcohol, polyacrylamide, anionic or cationic acid, such as cationic acid, or cationic acid anionic or cationic starch, polydiallyl ammonium chloride (PolyDADMAC) or polyvinylamine, natural dry strength agents such as galactomannan or alginates, synthetic dry strength agents such as polyamines, polyamide, polyols, polyacrylamides, polyvinyl alcohol, polyvinyl alcohol ), polyimine or polyethyleneimine (PEI), cross-linking or physical moisture-resistant medium such as glyoxal, glutaric dialdehyde (1,5-Pentandialdehyde), aldehyde starch, epichlorohydrin-polyamidoamine (PAAE), formaldehyde-melamine (MF) or u formaldehyde rea (HF), basic, acid and / or dyes (direct dyes), flame protection means such as halogenated flame protection means, organic flame-phosphorus protective products or flame protection means

inorganic, such as aluminum hydroxide, magnesium hydroxide, ammonium sulfate, antimony trioxide or antimony pentoxide. Finally, the additives of the groups, fixative, aluminum salts, flame inhibition medium, antifoam agent, fan, lignin derivatives, lignin sulphonate, biocides and / or fungicide can also be used. The additives may be admitted essentially one or more times at the same point and / or at different points in the manufacturing process.

[0012] The invention further relates to a device for the manufacture of a band of multilayer fibrous material, particularly a cardboard or paper band, including at least a first and a second layer of fibrous material, where the device has at least one defibration device for defibration and / or for the isolation of the first layer of fibrous material for fibers and / or individual fiber groups with a

10 moisture content between 95 and 40% by weight. By defibration and / or individualization of the first layer of fibrous material it is possible in turn to form a layer of porous fibrous material by means of the individual fibers and / or fiber groups of the first layer of fibrous material. Therefore, a band of multilayer fibrous material, which is economically producible on one side and has an improved resistance in the z-direction (perpendicular to the fiber plane plane) can be completely advantageously manufactured through the device according to the invention ). In addition, the band of multilayer fibrous material manufactured with the device according to the invention has an increased volume with a simultaneous reduction in density. Finally, high stiffness and good heat insulating characteristics of the multi-layered fibrous material web thus manufactured should be observed. The first layer of fibrous material is formed by applying a first suspension of fibrous material with a moisture content in a distributor mechanism between 99.9 and 96.0% by weight on a first permeable or non-permeable conveyor belt.

[0013] In advantageous configurations of the device according to the invention, the defibration device is formed of comb, brushed or roller type. Other configurations of the defibration device are also contemplated, where this defibration and / or an insulation of the first layer of fibrous material should allow individual fibers and / or groups of fiber. In this case, the defibration device may be arranged in a

25 extreme area in the direction of transport of the first layer of fibrous material of the first conveyor belt. The length and / or configuration of the first conveyor belt is chosen such that the moisture content of the first layer of fibrous material is between 95 and 40% by weight. Under the end area of the first conveyor belt, a second permeable or non-permeable conveyor belt may be arranged for housing the fibers and / or fiber groups defibrated and / or isolated from the first layer of fibrous material. In this case, it can be applied on the second conveyor belt and a second layer of fibrous material through an application of a second suspension of fibrous material with a moisture content in a correspondingly associated distributor mechanism between 99.8 and 96.0 % in weigh. The fibers and / or fiber groups isolated from the first layer of fibrous material are then applied directly to the second layer of fibrous material and form a layer of porous fibrous material. But it is also possible, that the insulated fibers and / or fiber groups be applied directly on this second conveyor belt for the formation of the layer of porous fibrous material. Furthermore, there is a possibility that the speed of the second conveyor belt and / or of another permeable or non-permeable conveyor belt is equal or unequal to the speed of the first conveyor belt. Therefore, the characteristics such as density and volume of the layer of porous fibrous material are advantageously adjusted and controlled.

[0014] In other advantageous configurations of the device according to the invention the device comprises at least

a pressure device for superimposing at least the second layer of fibrous material with a porous fiber layer formed of the defibrated and / or insulated fibers and / or fiber groups and / or at least one drying device for drying the web of multilayer fibrous material and / or at least one calender and / or at least one gluing and / or adhesive device and / or at least one acceptance device for the decrease of the fiber band 45 of the corresponding conveyor belt and / or at least one application device for additives and / or at least one cutting device. According to the requirements of the final product, that is to say, the band of multilayer fibrous material may comprise the device according to the invention one or more mentioned machine elements.

[0015] The present invention further comprises a band of multilayer fibrous material produced according to a method as described above and / or produced by an equally described device.

50 previously.

[0016] Other features of the invention result from the claims, the embodiments as well as with the help of the drawings. The characteristics cited above in the description and combinations of characteristics, as well as the characteristics cited successively in the examples of embodiment and combinations of characteristics can not only be used in the respective combination indicated, but also in other

55 combinations, without abandoning the marking of the invention. In this case it shows:

Fig. 1 a schematic representation of a device according to the invention for the manufacture of a band of multilayer fibrous material; Y

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Fig. 2 a schematic representation of an alternative embodiment of the device according to the invention for the manufacture of a multilayer fibrous web.

[0017] Fig. 1 shows a schematic representation of a device 20 for the manufacture of a multilayer fibrous web 10, particularly a cardboard or paper web. In the embodiment shown, the device 20 comprises a first distributor mechanism 38, on which a first suspension of fibrous material 16 is applied on a first permeable or non-permeable conveyor belt 18. The suspension of fibrous material 16 comprises both fibrous materials based on cellulose. Particularly, the suspension of fiber material 16 may consist of a mixture of fresh fibers and recycle fibers of old paper or old cardboard. The suspension of fiber material 16 has a moisture content between 99.9 and 96.0% by weight in the distributor mechanism 38. A first layer of fibrous material 12 is then formed on the first conveyor belt 18 of the first fiber material suspension 16.

[0018] It is recognized that a defibration device 48 is provided in the area of the first conveyor belt 18 in the area of a transport roller and deflection roller 26. The defibration device 48 serves to defibrate and / or isolate the first layer of fibrous material 12 for fibers and / or individual fiber groups 28. In the defibration and / or insulation the first layer of fibrous material 12 has a moisture content between 95 and 40% by weight. In the embodiment shown, the brush-type defibration device 48 is formed.

[0019] It is further recognized that the fibers and / or fiber groups defibrated and isolated 28 of the first layer of fibrous material 12 are mounted and / or laid on a second layer of fibrous material 14. The second layer of fibrous material 14 it is produced through a second fiber suspension 22 through a second distributor mechanism 40 on a second permeable or non-permeable conveyor belt 24. The second suspension of fiber material 22 has a moisture content between 99.8 and 96.0% by weight in the distributor mechanism 40. The fibers and / or fiber groups 28 applied in such a manner on the second layer of fibrous material 14 form on the second layer of fibrous material 14 a layer of porous fiber 36. This layer of porous fibrous material 36 particularly presents fibers and / or fiber groups, which are arranged in z-direction, ed they protrude from the plane x / y of the band of fibrous material 10. This results in a relatively high volume of the porous fiber layer 36 with a relatively low density. In addition, high resistance in the z-direction can be achieved.

[0020] In the exemplary embodiment shown, a third layer of fibrous material 34 is mounted on the layer of porous fibrous material 36. The third layer of fibrous material 34 is formed through a third distributor mechanism 42, which applies a third suspension of fiber material 30 on another conveyor belt 32 permeable or non-permeable. In the third distributor mechanism 42, the third suspension of fiber material 30 has a moisture content between 99.8 and 96.0% by weight. Both the second and third suspension of fiber material 30 contain fibrous materials based on cellulose or other source. In this regard, the so-called fresh fibers and / or recycling fibers and / or artificially produced fibers can be treated.

[0021] It is further recognized that the layer of porous fibrous material 36 overlaps the second layer of fibrous material that serves as the bottom layer and the third layer of fibrous material 34 that serves as the coating layer by a pressure device 44. After the superposition is carried out by drying the multi-layer fiber layer 10, as well as optionally applying one or several lines. In addition, the device 20 has a reception device 46 for receiving the band of fibrous material 10 of the conveyor belt 24. After the abandonment of the device 20, the band of multi-layer fibrous material 10 can be further processed.

[0022] Fig. 2 shows a schematic representation of a second alternative embodiment of the device 20 for the manufacture of a multilayer fibrous web 10. Thus, a subregion of the device 20 is represented. The arrangement of the defibration device 48 formed of a brush type is recognized. The defibration device 48 comprises here a cylinder 52, in which the corresponding bristles or teeth 54 are formed. The defibration device 48 is rotated in the opposite direction to this forwarding and transport cylinder 26 of the first conveyor belt 18. recognize, how the first layer of fibrous material 12 is defibrated and isolated. Then the individual fibers and / or fiber groups 28 that arise are mounted in the embodiment shown directly on a permeable or non-permeable conveyor belt 50. The arrows characterized with T in Figures 1 and 2 represent the transport directions of the conveyor belts 18, 24, 32, 50.

[0023] Through the movement of the conveyor belt 50, the layer of porous fiber material 36 is formed.

[0024] The parametric values indicated in the bases for the definition of measurement and process conditions for the characterization of specific characteristics of the object of the invention are also considered in the deviation framework for example due to measurement error, system defects , balance errors, DIN tolerances and the like as understood by the framework of the invention.

Claims (14)

5 10 fifteen twenty 25 30 35 40 Four. Five 1. Process for manufacturing a multilayer fibrous web (10), particularly a cardboard or paper web, which includes at least a first and a second fibrous web (12,14), characterized by the fact that this method comprises at least the following steps: - application of a first suspension of fiber material (16) on a first permeable or non-permeable conveyor belt (18) for the formation of a first layer of fibrous material (12); - defibration and / or insulation of the first layer of fibrous material (12) with a moisture content between 95 and 40% by weight for individual fibers and / or fiber groups (28); - forming a layer of porous fibrous material (36) by means of the individual fibers and / or fiber groups (28) of the first layer of fibrous material (12); Y - superposition of the layer of porous fibrous material (36) with the second layer of fibrous material forming the band of multilayer fibrous material (10). 2. Method according to claim 1, characterized in that the first suspension of fiber material (16) with a moisture content between 99.9 and 96.0% by weight is formed in a distributor mechanism (38) and the second layer of fibrous material (14) through an application of a second suspension of formed fiber material (22) in a second distributor mechanism (40) with a moisture content between 99.8 and 96.0% by weight on a second conveyor belt (24) permeable or non-permeable. Method according to claim 1 or 2, characterized in that the fibers and / or individual fiber groups (28) of the first layer of fibrous material (12) defibrated and isolated are mounted before overlapping with at least another layer of fibrous material (14) on a third conveyor belt (50) permeable or non-permeable for forming the porous fiber layer (36). Method according to claim 1 or 2, characterized in that the individual fibers and / or groups of fiber (28) of the first layer of fibrous material (12) defibrated and isolated before overlapping with the second layer of Fibrous material (14) is mounted directly on it to form the layer of porous fibrous material (36). 5. Method according to any of the preceding claims, characterized in that the method comprises the other phase of the application of at least another third suspension of fiber material (30) formed, in another machine head (42) with a moisture content between 99.8 and 96.0% by weight on at least one other permeable or non-permeable conveyor belt (32) forming another third layer of fibrous material (34), as well as the superposition of the third layer of fibrous material (34) with the layer of porous fibrous material (36) and / or the second layer of fibrous material (14). Method according to any one of the preceding claims, characterized in that the second layer of fibrous material (14) or the third layer of fibrous material (34) is formed as a cover layer or lower layer of the band of fibrous material (1st) of several layers. Method according to one of claims 2 to 6, characterized in that the speed of the second conveyor belt (24) or of the third conveyor belt (50) is equal or unequal to the speed of the first conveyor belt ( 18). Method according to any of the preceding claims, characterized in that fibrous materials based on cellulose and / or plastic fibers, particularly artificial fibers, are used for forming layers of fibrous material (12, 14, 34). and / or mineral fibers. Method according to any of the preceding claims, characterized in that the binders, retention means, filler material, colorants, bleach, liquid solidifying agent and / or other auxiliary agents used in the manufacture of cardboard and paper they are added to the layers of fibrous material (12, 14, 34) and / or the layer of porous fibrous material (36). 10. Device for the manufacture of a band of fibrous material (10) of several layers, particularly a cardboard or paper band, including at least a first and a second layer of fibrous material (12,14), characterized by the fact that the device (20) has at least one defibration device (48) for defibration and / or for the isolation of the first layer of fibrous material (12) for individual fibers and / or groups of fiber (28) with a moisture content between 95 and 40% by weight. 11. Device according to claim 10, characterized in that the defibration device (48) is configured in the form of a comb, brush or roller. Device according to claim 10 or 11, characterized in that the defibration device (48) is arranged in an extreme area in the direction of transport of the first layer of fibrous material (12) of 5 a first conveyor belt (18) permeable or non-permeable. 13. Device according to claim 12, characterized in that under the extreme area of the first conveyor belt (18) a second permeable or non-permeable conveyor belt (24) is arranged to receive the fibers and / or fiber groups ( 28) defibrated and / or isolated from the first layer of fibrous material (12). A device according to one of the claims 10 to 13, characterized in that the device (20) it also comprises at least one pressure device (44) for superimposing at least the second layer of fibrous material (14) with a layer of porous fibrous material (36) formed from the defibrated fibers and / or fiber groups (28) and / or insulated and / or at least one drying device for drying the multilayer fibrous web (10) and / or at least one calender and / or at least one gluing and / or adhesive device and / or at least one housing device (46) and / or at least one application device for additives and / or at least one cutting device. 15. Band of multilayer fibrous material produced according to a method according to one of claims 1 to 9 and / or produced by a device (20) according to one of claims 10 to 14.