METHOD AND DEVICE FOR MANUFACTURING SHAFT-SHAPED CEFFUFOSIAN SPINNED FIBERS

The present invention relates to a device for the production of a tubular, cellulosic spunbonded nonwoven, comprising a spinning mass production, a spinning system, a coagulation system, a depositing section for depositing and dewatering the spunbonded nonwoven, a transport device for transporting the spunbonded nonwoven in the transport direction, a washing system and a drying system. The invention further relates to a method for producing a tubular, cellulosic spunbonded nonwoven fabric and various uses of such a spunbonded nonwoven fabric.

Background of the invention

Cellulose is used as a filter medium in various filter systems because it has special properties and can also be used at temperatures of over 80 ° C. According to the state of the art, these are pressed cellulose filter candles bonded with adhesive or nonwovens which are coated with cellulose or cellulose fibers and in which, for example, phenolic resins are used to bind the cellulose to the mostly thermoplastic filter fleece. As a result, the production of the filter material is already very complex compared to seamless filter hoses and filter candles. The filter cartridges described in US Pat. No. 7,081,201 and US 2010/0089819 consist of several parts and are therefore more complex to manufacture than seamless filter cartridges. The use of cellulose as a filter material in liquids and gases has previously required complex compaction or coating processes, the use of adhesives and complex support structures and apparatus. The resins and adhesives used for bonding can limit the areas of application of the filter if they are not compatible with the medium to be filtered or undesirable chemical reactions can occur between the filter material and the medium to be filtered. In the case of compacted cellulose filter cartridges, even short cellulose fibers can loosen and lead to undesirable effects in the further process. So up to now it has not been possible to manufacture seamless filter bags and filter cartridges from cellulose directly without binding agents.

Cellulosic fibers can be produced, for example, by the Fyocell process (as described, for example, in US Pat. No. 4,246,221, US Pat. No. 6,306,334 and US Pat. No. 5,779,737) and then processed into nonwovens in several process steps. Since the fiber diameters of staple fibers are usually more than 10 μm, the nonwovens made from them are very porous and can only be used for filtration applications in limited areas.

The processes described in US Pat. No. 6,358,461, US Pat. No. 8,029,259, US Pat. No. 8,366,988, US Pat. No. 6,306,334 for the production of spunbonded nonwoven from Lyocell spinning mass deal with the production and aftertreatment of two-dimensional flat structures or nonwovens. These nonwovens have the necessary fineness and porosity to be able to be used as filter material for liquid and gas filtration, but the nonwovens also have to be reworked, if necessary, connected to carrier nonwovens, folded and incorporated into filter cartridges. The previously known devices for the production of Lyocell spunbonded fleece cannot be used for the production of filter bags or filter candles, since the devices were developed only for flat products and their properties.

Tubular, seamless spunbond nonwovens can only be produced from thermoplastic melts by means of the meltblown process, in that - as shown in US Pat. No. 3,905,736 - polymer melts are extruded through a meltblown nozzle, stretched with hot air and deposited on a rotating surface. Since the thermoplastic filaments are still hot, when they are deposited between the individual layers, points of adhesion occur at the points of contact between the filaments. As a result of the rotation of the storage surface and the adhesive effect described, a seamless spunbond tube is created from several interconnected layers of nonwoven fabric, which can be continuously pulled off and then processed into a nonwoven web. In US 3,801,400 and US 3,933,557 processing into filter candles and in US 3,905,734 and US 4,032,

The spunbond tubes can be produced by one or more nozzles in various arrangements, as described in US Pat. No. 8,231,752. According to US Pat. No. 5,409,642, the filament diameter can be varied between the individual layers in order to improve the filtration effect. The spunbond tubes can be produced batchwise or, as described in US Pat. No. 3,933,557, continuously. The previous processes were mainly used for the production of spunbond tubes made of thermoplastic materials and the devices were optimized for these raw materials. Based on the variation options mentioned, for example, purple candles with a high degree of separation and high purple capacity can be produced.

Since the production of thermoplastic, tubular spunbonded nonwovens is a dry spinning process in which the bonds can only be adjusted by changing the temperature of the extruded lilaments, the devices and methods known up to now are only used to shape the filter hose. In contrast to this, cellulosic spinning masses are cellulose solutions in which the temperature effect cannot be exploited to the same extent as with thermoplastics, but instead other ways have to be found to produce the bonds. In addition, coagulation liquids are sprayed onto the extruded filaments during the production of cellulosic spunbonded nonwovens. For environmental and safety reasons, both the coagulant and the solvent must be removed and recovered from the spunbond tube and from the exhaust air. In contrast to the known devices for thermoplastics, the cellulosic spunbond tube must also be dewatered, washed and dried immediately after being deposited in order to minimize the amount of solvent in the product and to stabilize the shape of the tube produced.

Brief description of the invention

So far it has not been possible to manufacture seamless filter bags and filter candles directly from cellulosic spinning mass and without binding agents. Since the previously known devices and methods do not meet the above-mentioned claims, it is the object of the present invention to provide a device and a method for the production of cellulosic spunbond tubes. In particular, the direct production of seamless, multi-layer, binder-free, tubular, cellulosic spunbond nonwovens, for example for a filter, should be made possible.

This object is achieved by a device for producing a tubular, cellulosic spunbond nonwoven, comprising

• a spinning mass production,

• a spinning system,

• a coagulation system,

• a depositing section for depositing and draining the spunbond,

• a transport device for transporting the spunbonded web in the transport direction,

• a washing system and

• a drying system,

characterized in that the storage section is designed to be rotatable, the

The axis of rotation of the storage section lies along the transport direction.

Furthermore, it can be provided that a suction device is assigned to the storage section.

The suction device can be inclined at least in sections in order to take into account the increase in thickness of the hose due to the filaments deposited.

The suction device can be used both for suction or dewatering of the spunbonded nonwoven as well as for suction and removal of process air.

In a further variant, several suction devices can be arranged - for example directly - below the rotatable storage section, or at a distance of 1 to 100 cm, preferably 10 to 50 cm, even more preferably 20 to 40 cm, in order to suck off the solvent-laden process air stream and further The sequence to be supplied to the solvent recovery.

In addition, the device can be enclosed (see FIG. 2 below) so that the solvent-laden exhaust air inside the housing can be removed by a large-area suction device and contamination of the surrounding plant room is prevented.

A cutting unit can also be provided.

The cutting unit is preferably arranged after the drying system.

The object is further achieved by a method for producing a preferably seamless, multi-layer tube made of cellulose, wherein cellulose is processed into a spinning mass and then extruded into filaments with a spinning system and stretched by means of hot air, the stretched filaments with a coagulation liquid before being deposited are wetted so that bonds are formed in places between the drawn filaments, the drawn and locally bonded filaments then being deposited on a rotating tray and further bonds being formed with the filaments already on the rotating tray by means of coagulation liquid.

It has been shown that the degree of adhesion can be specifically influenced by the coagulation (amount of coagulation liquid, temperature, concentration, surface of the liquid mist), i.e. the regeneration of the cellulose. The fusion of several individual filaments at their points of contact is referred to as bonding. Before they hit the shelf, the filaments are only wetted with the coagulation liquid to such an extent that some of them still remain liquid and melt when they come into contact with one another, thus creating a bond. Surprisingly, the bonding effect could be set so that the

Adhesions could be created not only in flight, i.e. in a spunbond layer, but also when they hit, between filaments that had already been laid down and just hit, resulting in a wet but dimensionally stable tube that was glued over several layers. According to the invention, in the extreme case, no coagulation liquid is applied and a maximum of adhesions is thereby produced. The bonds can be spherical or flat, for example, and have a diameter of 10 μm to 500 μm, preferably 30 μm to 300 μm, even more preferably 50 to 200 μm. The coagulation liquid can either be injected directly into the process air or sprayed onto the filament curtain using various spray and atomization systems. Water and various solvent mixtures, such as NMMO / water mixture (/ V-methylmorphol i nV-ox id) can be used. The concentration of NMMO in the coagulation liquid can be between 0-45%, preferably 10 to 40%, even more preferably between 20 and 30%. The temperature of the coagulation liquid can be between 5 ° C and 90 ° C, preferably between 10 ° C and 70 ° C, even more preferably between 20 ° C and 60 ° C.

One aspect of the invention relates to a seamless cellulosic tube consisting of several layers of stretched filaments that are glued in places. Both the number and the size of the bond points can be approximately constant parallel or independently of one another over all layers, increase from the outside to the inside, decrease from the outside to the inside, or be varied several times within a tube. For example, the number of adhesions can increase from the outside to the inside, reach a maximum at half the diameter of the hose and then decrease again. Through the mentioned variation, the strength and the air permeability of the hose can be adapted for the respective application. The seamless cellulosic tube can be free of binders.

One aspect of the invention relates to a seamless cellulosic tube consisting of several layers of stretched filaments that are glued in places. Both the number and the mean diameter of the filaments can be approximately constant parallel or independently of one another over all layers, increase from the outside to the inside, decrease from the outside to the inside, or be varied several times within a tube. For example, the mean filament diameter of the filaments can decrease from the outside to the inside, reach a minimum at half the diameter of the tube and then increase again. Here, too, the aforementioned variation can be used to adapt the absorption capacity, the degree of separation and the air permeability of a filter for the respective application.

One aspect of the invention relates to a seamless tube made of cellulosic and thermoplastic spunbond nonwoven, with the above-mentioned possible variations.

One aspect of the invention relates to a seamless, partially or fully carbonized or activated tube made of cellulosic spunbonded nonwoven. With the above-mentioned variation options.

One aspect of the invention relates to a filter comprising a hose.

Finally, the invention relates to the use of the filter for adsorption, chemical bonding or absorption of substances from gases, liquids and emulsions, for separating emulsions, for dedusting exhaust gases, as droplet separators, for decolourising liquids, for disinfecting gases and liquids , for drinking water treatment, for water softening, for separating oil from gases, for separating emulsions, for deodorization in the food industry, in the chemical industry, in the pharmaceutical industry, in the automotive industry, in the electrical industry, in the petroleum industry, in the petrochemical industry, in the cosmetics industry.

The invention relates to a method for the direct production of seamless, multi-layer, tubular, cellulosic spunbonded nonwovens, which are ideal for a wide variety of applications, in particular for filtration applications, due to the great variety of the number of layers, the gluing points, the filament diameter, the tube diameter and the length of the tube can be customized.

Detailed description of the invention

In order to better illustrate the invention, the essential features are shown in the following figures on the basis of preferred embodiments of the device according to the invention:

1 shows a block diagram of the method according to the invention.

Fig. 2 shows schematically a device according to the invention for the production of

Filter candles in a side view.

Fig. 3 shows schematically a device according to the invention for the production of

Filter bags in a side view.

4a, 4b schematically show the rotating storage section in perspective

Representation and in front view.

5 shows a device according to the invention in a side view for the continuous production of a cellulosic spunbond tube without a wound core.

6 shows a device according to the invention in side view, for the continuous production of a cellulosic spunbond tube with a wound core.

7 shows a device according to the invention in a side view for the discontinuous production of a cellulosic spunbond tube with a wound core.

Fig. 8 shows schematically a spunbond tube piece or a filter candle.

9 shows a spunbonded nonwoven layer with many glued surfaces and the open pores in between.

10 shows a spunbonded nonwoven layer with few adhesions.

1 shows a block diagram of the method according to the invention, in which cellulosic spinning mass is extruded through a meltblown nozzle to form fine filaments and stretched by means of hot air. According to the invention, the drawn filaments are only wetted with coagulation liquid to such an extent before they are deposited on a rotating cylinder that adhesions are formed between the individual filaments and the individual layers of the spunbond tube produced. It has been shown that these adhesions give the spunbond tube sufficient stability after washing and drying so that it can finally be wound up or cut into individual tube pieces. The addition of binders was therefore not necessary,

The device 1 according to the invention described in FIG. 2 can be used to carry out the method according to the invention and to produce filter candles. The device 1 according to the invention comprises a spinning mass generator 8, a spinning system 2, and a depositing section 3 for depositing the spunbonded nonwoven, a coagulation system 4, a washing system 5 (or post-treatment), a drying system 6 (possibly for carbonization and activation) 6, a cutting unit 7 and a hot air supply 9. With the device 1 according to the invention, the filaments 10 can be extruded, stretched, coagulated and formed into a spunbond tube 11 on the rotating depositing section 3 for depositing the spunbonded nonwoven. After the washing system 5 and the drying system 6, the continuously produced spunbond tube can either be wound up into filter candles 12 or, as shown in FIG. 3, into filter tubes 18. The device according to FIG. 3 is essentially constructed in the same way as the device from FIG. 2 with the difference in the winding.

The continuous production of the product according to the invention without a core can, as shown in FIG. 5, be made possible by means of driven take-off rollers 13. When the rotating tray 3 is a bare polished shaft, the filter bag is pulled from the shaft by the take-off rollers 13 and the linear movement of the rotating tube under the nozzle is enabled. The rotating storage section 3 can also have at least one spiral thread on the surface from front to back. Due to the friction of the spunbond hose shown in Fig. 3 on the outer surface with the suction unit 17 and the friction with the rotating, spiral thread inside the hose, the hose is conveyed evenly in the direction of the washing system 5 (similar to the conveying principle of a screw conveyor or an extruder ). As an alternative to this, however, as shown in FIG. 6, cores 23 can also be used for the spunbond deposit in order to produce filter candles. Perforated winding cores 23 are fed in piece by piece, connected and continuously transported onward via drive rollers 22. A further variant is also the discontinuous production with winding core 23 shown in FIG. 7. The filaments are sprayed alternately onto two rotating depositing sections 3 for depositing the spunbonded nonwoven. While the depositing section 3 is sprayed under the nozzle of the spinning system 2 for depositing the spunbonded nonwoven, the spunbonding tube 11, including core 23, is pulled off a second depositing section 3 for depositing the spunbonded nonwoven and equipped with an empty core 23. The spunbond tube is then washed (treated with chemicals if necessary), dried (optionally carbonized and activated) and, for example, processed or cut into filter candles 12. It has been shown that with the present device and variations of the preferred embodiment, seamless, multi-layer, cellulosic filter tubes or filter candles with and without a core can be produced.

Fig. 8 shows schematically a filter candle with the cavity in the middle and the surrounding spunbond layers. Since the spunbonded nonwoven 11 is moved during the spraying with the filaments 10, the folds are gradually built up along the movement under the spinning system 2. One spinning system 2 can be used, or several spinning systems 2, with the same or different filament diameters. It has

has shown that the bonds can be varied for each spinning system and thus filter materials with different layers, filament diameters, pore sizes and thus the most varied of filtration properties can be produced. FIG. 9 shows a spunbond layer with many adhesions, while the spunbond in FIG. 10 has many individual filaments. It is also possible to use additional spinning systems 2 with non-cellulosic spinning mass, for example thermoplastic melts, in order to produce tubular products with cellulosic and non-cellulosic layers and thereby to influence the properties of the tubular product.

The product according to the invention includes, inter alia, a seamless, multi-layer filter tube made of cellulose, which can be processed, for example, into filter candles and filter tubes. The product according to the invention can also contain non-cellulosic layers, be chemically aftertreated or functionalized, contain additives to increase filtration performance, increase flame resistance, enable ion exchange and increase chemical resistance to the filtration medium. In addition, the filter hose can be partially or completely carbonized and / or activated in order to increase the surface activity and the adsorption properties. The product according to the invention can be used, for example, for filtration, separation, ion exchange, disinfection of liquids and gases, separation of emulsions,

A wide variety of pulps, solvents and cellulosic spinning masses produced therefrom can be used for the process according to the invention. A spinning mass is a multicomponent system in which cellulose is brought into solution by a suitable solvent, for example ionic liquids, preferably tertiary amine oxides, even more preferably NMMO / water mixture, and is thus extrudable and spinnable. The pulp content in the case of a Lyocell spinning mass can be between 4 and 15%, preferably between 6% and 14%, even more preferably between 7% and 13%. In the case of the Lyocell spinning mass, the temperature can be between 80 ° C and 160 ° C, preferably 90 ° C and 150 ° C, even more preferably between 100 ° C and 140 ° C.

It has been shown that the spinning mass can be extruded and drawn through both single-row and multi-row meltblown nozzles (spinning system 2). Several spinning systems 2 connected one after the other can be used in order to produce layers with different filament diameters. If only one spinning system 2 is used, the extrusion hole geometry from one side of the nozzle to the other side of the nozzle can vary both in size and in geometry (e.g. become larger along the nozzle; holes at the beginning are circular and at the end Y-shaped) to make fine filaments in the

inner layers and coarse filaments in the outer layers, or circular filaments inside and hollow fibers outside. Further combinations of size, gradient and geometry are possible depending on the desired product properties. Depending on the nozzle design, the hot process air emerges from a gap or a hole next to or around the extrusion openings and pulls the spinning mass filaments with it. The filament is accelerated and the diameter is reduced. Subsequently, the filaments are swirled by the turbulence of the process air and can be deposited as a spunbond on a rotating surface. The nozzle length can be between 50 mm and 2000 mm, preferably 100 mm and 1000 mm, even more preferably between 200 mm and 500 mm. The cellulose throughput can be between 1 kg / h / m and 500 kg / h / m nozzle length, preferably between 15 kg / h / m and 250 kg / h / m, even more preferably between 20 kg / h / m and 100 kg / h / m. The extrusion holes of the nozzle can be between 0.05 mm and 3 mm, preferably between 0.2 mm and 1 mm, even more preferably between 0.3 mm and 0.6 mm. The pulp throughput per extrusion hole can be between 0.001 g / hole / min and 30 g / hole / min, preferably 0.1 g / hole / min and 20 g / hole / min, even more preferably between 1 g / hole / min and 10 g / Hole / min. In the case of single-row slot nozzles, the air gap width can be between 0.5 mm and 5 mm, preferably 1 mm and 3 mm, even more preferably 1.5 mm and 2 mm. In the case of multi-row nozzles, the air outlet diameter can be between 0.5 mm and 5 mm, preferably 1 mm and 3 mm, even more preferably 1.5 mm and 2 mm. The process air overpressures used can be between 0.1 bar and 10 bar, preferably 0, 3 bar and 5 bar, even more preferably 0.5 bar and 2 bar. This results in air outlet speeds at a nozzle distance of 20 mm from 50 m / s to 300 m / s, preferably 70 m / s to 250 m / s, even more preferably 100 m / s to 200 m / s. With a distance between the nozzle and the rotating support of 50 mm to 1000 mm, preferably 200 mm to 800 mm, even more preferably 300 mm to 600 mm, individual fiber diameters of 0.1 mhi to 100 μm, preferably 0.5 mhi to 50 mhi result , more preferably between 1 mhi to 30 mhi.

It has been shown that the degree of adhesion can be influenced in a targeted manner by the coagulation, i.e. the regeneration of the cellulose. The fusion of several individual filaments at their points of contact is referred to as bonding. Before they hit the shelf, the filaments are only wetted with the coagulation liquid to such an extent that some of them still remain liquid and melt when they come into contact with one another, thus creating a bond. According to the invention, in the extreme case, no coagulation liquid is applied and a maximum of adhesions is thereby produced. The bonds can be spherical or flat, for example, and have a diameter of 10 μm to 500 μm, preferably 30 μm to 300 μm, even more preferably 50 to 200 μm. The coagulation liquid can either be injected directly into the process air or sprayed onto the filament curtain using a wide variety of spray and atomization systems. Water and a wide variety of solvent mixtures, such as NMMO / water mixture, can be used as the coagulation liquid. The concentration of NMMO in the coagulation liquid can be between 0-45%, preferably 10 to 40%, even more preferably between 20 and 30%. The temperature of the coagulation liquid can be between 5 ° C and 90 ° C, preferably between 10 ° C and 70 ° C, even more preferably between 20 ° C and 60 ° C. such as NMMO / water mixture can be used. The concentration of NMMO in the coagulation liquid can be between 0-45%, preferably 10 to 40%, even more preferably between 20 and 30%. The temperature of the coagulation liquid can be between 5 ° C and 90 ° C, preferably between 10 ° C and 70 ° C, even more preferably between 20 ° C and 60 ° C. such as NMMO / water mixture can be used. The concentration of NMMO in the coagulation liquid can be between 0-45%, preferably 10 to 40%, even more preferably between 20 and 30%. The temperature of the coagulation liquid can be between 5 ° C and 90 ° C, preferably between 10 ° C and 70 ° C, even more preferably between 20 ° C and 60 ° C.

After coagulation, the filaments are deposited on a rotating depositing section 3 for depositing the spunbonded nonwoven. The rotating depositing section 3 for depositing the spunbond can be like a driven shaft or a dome made of metal. The diameter of the rotating shelf can be between 1 cm and 100 cm, preferably between 1.5 cm and 50 cm, even more preferably between 2 cm and 30 cm. Depending on the nozzle length, the rotating shelf for continuous production without a core (FIG. 5) can be 25 to 500 cm, preferably 50 to 400 cm, even more preferably 100 to 300 cm long. In the case of continuous production with a core, as shown in FIG. 6, the winding cores are used as a rotating tray. In both cases, drive rollers 22 and take-off rollers 13 can be used for continuous production, to enable the linear movement of the spunbond tube along the length of the nozzle. In the discontinuous production shown in FIG. 7, the entire rotating support is moved under the spinning system in order to load the core with spunbond layers. When a core is coated, it is pulled away from the nozzle and replaced with a new core. This is then shifted linearly along the nozzle again until a spunbond tube is created. In all three cases, the linear movement of the rotating support 3 under the spinning system 2 is responsible for the fact that the spunbond tube is built up from the inside out. Therefore, a variation of the filament fineness along the spinneret means that the porosity or air permeability of the different layers can be varied. This type of product variation is particularly desirable for filtration applications. The filter hose consists of at least one layer. It has been shown that the number of layers and thus the thickness of the filter hose produced can be varied depending on the application by adapting either the throughput through the nozzle, the rotational speed of the rotating tray 3 or the withdrawal speed of the drive or withdrawal rollers.

According to the invention, the shelf can also be influenced by using a perforated tube that is placed under vacuum 24 as the rotating shelf. The filaments are specifically sucked in and dewatered at the same time. The excess coagulation liquid can either be drained off, as shown in FIG. 2, and collected in collecting trays, or it can be actively removed via the suction unit shown in FIG. 4a. The rotatable storage section 13 shown in FIG. 4a has a suction unit which can be used for removing the coagulation liquid, the process air and the washing liquid in the laundry. The spunbond tube is supported by rollers 19 and / or, as shown in FIG. 4a, by a conveyor belt 20. The roles 19 resp. the conveyor belt 20 rotates at the same speed as the rotating tray 3 or spunbond tube 11. Between the rollers 19 and under the conveyor belt 20 there is a suction unit 21. The suction unit drains the spunbond tube. The drainage effect, as shown in FIG. 4b, can be enhanced by the take-off rollers 13, which in this case serve as press rollers. The moisture content can be reduced to up to 30% using the dewatering unit. As shown in Fig. 3, the liquids from the drainage boxes reach either the coagulation tank 15 or the washing system tank 14. The liquid from the coagulation tank 15 is fed to the solvent recovery, while the liquid from the washing system tank can be used for the coagulation system 4.

The spunbond tube ends up in the laundry after the fleece has been formed. The remaining solvent is removed from the spunbond tube. The spunbond tube can either be guided through a basin or bath, under spray nozzles, or other sprinkling systems in which water is supplied in countercurrent and solvent is removed, or through several stages connected in series, in which, for example, water is sprayed onto the spunbond tube in countercurrent and either drained or removed by the suction unit 17. The washing can consist of several washing stages in which the countercurrent extraction is repeated until the desired purity is achieved. The temperature of the washing liquid can be between 20 and 90.degree. C., preferably between 30 and 85.degree. C., even more preferably between 40 and 80.degree. The temperature can also be varied for the different washing stages. For example, the first washing stage can be warmer than the last. Based on the countercurrent principle of laundry, the concentration of the solvent in the spunbond tube decreases while the wash water is concentrated. The concentrated wash water can then be used for coagulation. In the laundry, the properties of the spunbond tube can be influenced by the addition of chemicals, for example to increase the temperature resistance, chemical resistance, dimensional stability and filtration performance through functional groups. Disinfectants and flame retardant impregnation agents can also be added (chemical post-treatment). For example, the first washing stage can be warmer than the last. Based on the countercurrent principle of laundry, the concentration of the solvent in the spunbond tube decreases while the wash water is concentrated. The concentrated wash water can then be used for coagulation. In the laundry, the properties of the spunbond tube can be influenced by the addition of chemicals, for example to increase the temperature resistance, chemical resistance, dimensional stability and filtration performance through functional groups. Disinfectants and flame retardant impregnation agents can also be added (chemical post-treatment). For example, the first washing stage can be warmer than the last. Based on the countercurrent principle of laundry, the concentration of the solvent in the spunbond tube decreases while the wash water is concentrated. The concentrated wash water can then be used for coagulation. In the laundry, the properties of the spunbond tube can be influenced by the addition of chemicals, for example to increase the temperature resistance, chemical resistance, dimensional stability and filtration performance through functional groups. Disinfectants and flame retardant impregnation agents can also be added (chemical post-treatment). Based on the countercurrent principle of laundry, the concentration of the solvent in the spunbond tube decreases while the wash water is concentrated. The concentrated wash water can then be used for coagulation. In the laundry, the properties of the spunbond tube can be influenced by the addition of chemicals, for example to increase the temperature resistance, chemical resistance, dimensional stability and filtration performance through functional groups. Disinfectants and flame retardant impregnation agents can also be added (chemical post-treatment). Based on the countercurrent principle of laundry, the concentration of the solvent in the spunbond tube decreases while the wash water is concentrated. The concentrated wash water can then be used for coagulation. In the laundry, the properties of the spunbond tube can be influenced by the addition of chemicals, for example to increase the temperature resistance, chemical resistance, dimensional stability and filtration performance through functional groups. Disinfectants and flame retardant impregnation agents can also be added (chemical post-treatment). In the laundry, the properties of the spunbond tube can be influenced by the addition of chemicals, for example to increase the temperature resistance, chemical resistance, dimensional stability and filtration performance through functional groups. Disinfectants and flame retardant impregnation agents can also be added (chemical post-treatment). In the laundry, the properties of the spunbond tube can be influenced by the addition of chemicals, for example to increase the temperature resistance, chemical resistance, dimensional stability and filtration performance through functional groups. Disinfectants and flame retardant impregnation agents can also be added (chemical post-treatment).

After washing, the spunbond tube 11 still has to be dried. Through-flow dryers (convection dryers), radiation dryers (IR, UV, microwave) but also contact dryers with heated rollers can be used. The moisture content is reduced to 2 to 14%, preferably 4 to 12%, even more preferably 6 to 10%. It has been shown that the spunbond tubes, after appropriate impregnation in the laundry, can also be partially or completely carbonized and / or activated. This significantly increases the specific surface area of ​​the product and the absorption and adsorption properties.

With continuous production, the spunbond tube can either be cut into smaller units (Fig. 2) or wound up as a tube roll (Fig. 3)

The described washing (chemical post-treatment) and drying (resp.

Carbonization) is carried out in batches in the case of discontinuous production.

The manufactured product can be used as a pure cellulose spunbond tube

Cellulose / thermoplastic spunbond tube, as a carbonized spunbond tube, as an activated spunbond tube, chemically post-treated to increase flame resistance and temperature stability and to improve the adsorption, chemical bonding and absorption of substances from gases, liquids and emulsions, for example as filter cloth, filter candle, Filter hose, bag filter, for separating solids from gases and liquids, for separating liquids from gases, for separating emulsions, for dedusting exhaust gases, as droplet separators, for decolourising liquids, for disinfecting gases and liquids, for drinking water treatment, water softening, Separation of oil from gases, separation of emulsions, for deodorization in the food industry, in the chemical industry,in the pharmaceutical industry, in the automotive industry, in the electrical industry, in the petroleum industry, in the petrochemical industry, in the cosmetics industry and in the private sector.

Furthermore, the product according to the invention can be used for extraction thimbles in the fabulous area and as a filter for instrumental analysis. The filter hose can also be made into tea bags and coffee filters, for example.

In the cosmetics sector, the filter hose can be used, for example, as a finger hose for applying or removing cosmetics (cream, powder, ...). The cellulose filter bags can be used as biodegradable packaging material for fruit and vegetables in the trade. Due to the water absorption of the cellulose, the product according to the invention is also suitable for packaging and as protection against corrosion of metal parts for transport and storage. In the agricultural sector, the product according to the invention can be used to protect plants from mechanical effects, dehydration, insects and animals or to supply nutrients to the plant.

The spunbond tube can also be used as a bandage in the therapeutic or medical field to support the muscles, as a wound dressing, as a support bandage, to regulate moisture and promote wound healing.
EXPECTATIONS

1. Apparatus for producing a seamless tubular, cellulosic spunbond nonwoven, comprising

• a spinning mass production (8),

• a spinning system (2),

• a coagulation system (4),

• a depositing section (3) for depositing and draining the spunbond,

• a transport device (13, 22) for transporting the spunbonded web in

Transport direction,

• a washing system (5) and

• a drying system (6)

characterized in that the storage section (3) is designed to be rotatable, the axis of rotation of the storage section (3) lying along the transport direction.

2. Device according to claim 1, characterized in that the storage section (3) is assigned at least one suction device (17).

3. Device according to claim 2, characterized in that the suction device (17) is inclined at least in sections.

4. Device according to one of claims 1 to 3, characterized by a cutting unit (7).

5. A method for producing a seamless multi-layer tube made of cellulose, cellulose being processed into a spinning mass and then extruded into filaments with a spinning system and stretched by means of hot air, the stretched filaments being wetted with a coagulation liquid before being deposited in such a way that sticking occurs in places between the drawn filaments and / or over several folds in the deposit, the drawn and possibly locally glued filaments are then deposited on a rotating deposit, dewatered, washed and dried.

6. The method according to claim 5, characterized in that the solvent is washed out of the spunbonded nonwoven and conveyed to the solvent recovery

7. The method according to claim 6, characterized in that the process air is sucked off and conveyed for solvent recovery

8. Seamless hose, consisting of several layers of stretched cellulose filaments, the cellulose filaments being glued to one another in places in each layer and the individual layers being glued to one another in places, the hose being essentially free of binding agent.

9. A filter comprising a hose according to claim 8.

10. Use of a filter according to claim 9 for adsorption, chemical bonding or absorption of substances from gases, liquids and emulsions, for separating emulsions, for removing dust from exhaust gases, as a droplet separator, for decolorizing liquids, for disinfecting gases and liquids , for drinking water treatment, for water softening, for separating oil from gases, for separating emulsions, for deodorization in the food industry, in the chemical industry, in the pharmaceutical industry, in the automotive industry, in the electrical industry, in the oil industry, in the petrochemical industry, in the cosmetics industry.