MXPA96001333A - Device and disposal for use in the processing of cellular solutions - Google Patents

Abstract

The present invention relates to a device for controlling the pressure in a flowing viscous mass, said device characterized in that it comprises: an entrance through which the mass flows towards the device, a guide element having a receiving capacity for the mass flowing from said inlet, a piston having an opening, said piston moves inside the guide element, the receiving capacity of said guide element, being varied by moving the piston, a receptacle attached to said opening in said piston and attached to said piston. the inlet, so that the flowing mass passes from said inlet through said receptacle and through said opening of the piston towards said guide element, an outlet towards which said guide element leads, and therefore the flowing mass is discharged from the device, provided that said inlet, said guide element and said receptacle are designed in a pipe form and that said receptacle is slide over said entrance like a telescope when said piston moves

Description

DEVICE AND DISPOSAL FOR USE IN THE PROCESSING OF CELLULOSE SOLUTIONS DESCRIPTION OF THE INVENTION The present invention relates to a device for controlling the pressure in a viscous mass and a provision for the production of cellulose molded bodies. In particular, the prett-nte in tion referred to a 1 device for controlling the pressure in a viscous, flowing, high-cellulose solution, such as a moldable solution of cellulose in a tertiary amine oxide, which is transported from a solution producing unit to a forming tool. - In order to produce fibers, films or other shapes molded from a starting material such as a polymer or thermoplastic resin solution in a constant and high-quality form, not only is it necessary that the chemical / physical properties of the starting material 0 remain unchanged, but also in the forming tool, ie in the spinner or film extrusion die, the same conditions always prevail. For this purpose, the uniformity of the spinning pressure is of vital importance- In normal operations of an arrangement of • industrial scale, this condition will usually be performed, but (in some cases, the starting material is diverted or withdrawn before reaching the for-profit tool, eg, when a filter is re-drawn or other pro-posed, the Spinning pressure will naturally fall In this case, appropriate devices should be provided for the composition of the deviated starting material in order to avoid a drop in pressure. AT-B 397 0l + 3, which will be described in more detail below - On the other hand, it may happen that the feed of the starting material to the forming tool has to be completely interrupted, for example, to exchange the forming tool However, this interruption should not affect the production of the starting material, since the stoppage and the start of the production process implies the risk of not assuring the constant quality of the material. In this way, it is necessary, in order not to interrupt the continuous production of the starting material, to provide some kind of deposit to take the material produced during the time in which no material is processed. starting by the forming tool. Said device is presented in WO 9'-r / 02LtO &, which will be described later. 6B-A-AW1,403, describes a device by which a viscous material, such as margarine, can be supplied intermittently. This device has a cylindrical reserve chamber in which a piston moves, supplying the margarine in portions. The margarine is pushed into the reserve chamber in a direction opposite to the front * of the piston, deflected and supplied intermittently in the opposite direction. It is not mentioned whether said device is also suitable for the continuous supply of a highly viscous material. DE-A-3 416 &99, describes a decorating machine layers to apply, eg, a mass of chocolate to breads. Between the spray nozzles in one hand and a pump for the powder mass in the other hand, a cylinder is provided, a pneumatic cylinder acting on the piston of the first. In this way, a uniform supply of the mass of chocolate to the spray nozzle is obtained, independent of the pressure variations caused by the pump. However, in some cases, the device to control the magnitude of a mass flow and the compression of the pressure variations in a highly viscous, flowing mass is required to satisfy another condition: it must not exhibit any volume of clear where it is accumulates the starting material. This is especially important when the properties of the starting material change gradually. The viscous polymer solids or thermoplastic materials of one or more polymers generally have to be processed at elevated temperature. In such cases, it may happen that the polymer has, at elevated temperature, insufficient stability and undergoes degradation reactions. These de-ralation reactions may possibly have an explosive character, and thus a risk of extinction. ^ - >The problems will be described below with more examples of the solutions of cellulose solutions in oxides of methylmercury. For a general description of the production of cellulose solutions in tertiary amine oxides reference is made to US Pat. No. 4,196,? 2. In the following, "NMMO" from IM-met i lmar f ol in) will be used instead of the term "tertiary amine oxides". The cellulose solution in NMMQ results in a partial degradation of the cellulose chain of the polymer. This partial degradation has a negative effect on the spinning safety and on certain properties of the finished products, such as fiber strength, fiber elongation and loop strength. Furthermore, it is known that cellulose solutions undergo gradual discoloration due to the degradation of the ^ mm oxides used. For example, the NMMQ monohydrate is cold or normal in conditions such as a white ipstatin solid, which melts at 72 ° C. When the onohxdrate is heated, a strong discoloration of 12? / L3? ° C will occur towards harp. From 1 7 ° C upwards, an exothermic reaction is triggered, the molten mass being completely dehydrated and large amounts of gas develop, which finally leads to an explosion, temperatures rising well above 25 ° C. It is known that metallic iron and copper and its salts significantly reduce the temperature and decomposition of NMNO, while the efficiency of deoxylation increases simultaneously. In addition to the above-mentioned problems, there is another difficulty, that is to say, the thermal messab 11 of the same solutions of NM Ü / celu Losa. This means that at high processing temperatures (approx. 110-120 ° C), decomposition processes inc ntroblles in the solutions will be developed, which due to the development of gases, can lead to deflagrations, ince gods still explnsionet . In the literature, very little is known about the correlations of the thermally unstable nature of the solution, ie the extrusion mixture. Particularly when metal ions are present, in certain cases a leakage of the decomposition reactions in the purifying material may occur. the presence of metal ions in the solution, however, never pu > It must be completely discarded "due to the metal construction of the disposition elements, suitably made of stainless steel. Until now < > a, in the literature a layer stabilization measurement has not yet been described: to establish sufficient cellulose and NMMQ, as well as to reduce the thermal instability of the cellulose / NN O solution to a certain degree that explosive decomposition under conditions procedural. It is evident that particularly the thermal instability of the materials iiifurif leaderes h, The problem is that in co / uponerit it is of i = osition that they have higher capacities such as μH regulating vessels, stirring vessels, mixing machines, etc., these materials and micro-standards are suitable for a Safety. In order to control the risk of explosion during the production of the solution and to keep the thermal load on the solution low, in FP-A-0356 419 the solution is orenated in a thin film treatment apparatus instead of a stirring vessel or similar devices. In this procedure, the cellulose suspension in N 10, the NMMO "having a water content of up to 40, is understood as a layer along the hot surface of the thin film treatment apparatus and is transported, being exposed At a low temperature and pressure, to remove the water until the cellulose dissolves, it is possible to quickly heat the suspension to the temperatures necessary for the preparation of the solution in an economical way, and simultaneously prepare quickly the solution to avoid a major breakdown of a cescomposite of the amine oxide and a decomposition of cellulose, in addition, the safety measure, compared the preparation of the solution in a stirring vessel, is sigificantly reduced, since that the solvent is not tempted in a large quantity at a time, but only in comparatively small quantities.

Ce this _or * ta, the? Ro < - irttpto ed in EP-A - 0 ^ 6 419 reduces the risk for the security that occurs during the production of the solutions of elulcsa by means of the latest techniques. However, there is still a risk of degradation of cellulose and NMMO exothermic reactions, deflagrations, etc., when the finished solutions are processed, that is, in the arrangement components provided between the thin film treatment apparatus and the tool This type of separation device includes pH or reserve buffer vessels that, for example, are arranged between a filter device, which can be backwashed, and the utility tool, to avoid as far as possible the discont i In the flow of the impuritator material to the spinning machine when the filter is changed or backwashed .. As mentioned above, said filter disoositi, which can be backwashed, having the reserve reservoir attached it is known from AT-B 397 043. This device has been developed for a thermonplastic synthetic matepal and has a cover, in which there are two sopo members. Adjustable sieve you ce between an operating position and a position backwash. In the backwash position, the screen to be backwash is downwardly in an open relationship with the downstream side of the screen that is in the operating position. A cylindrical reserve chamber is shaped like a 1", where a piston moves, is attached to the common discharge line leading to the spinning machine, before starting the backwash procedure, the piston The synthetic material is slowly removed from the discharge channel, the synthetic material is deviated at such a low speed that no significant pressure drop occurs in the spinning machine. When the reservoir is readied with the melt, the sieve support member carrying the sieve to be backwashed is changed to the backwashing position and the backwash is performed by means of the piston so that the pressure and the machine The spinning mill is at least appro- priately maintained.This known device has the disadvantage that it is only able to immediately compensate for a rapidly occurring pressure drop in the discharge channels if a certain amount of synthetic material is always present as a reserve in the cylindrical reserve chamber, which, when required, can be supplied by the piston immediately to the discharge channel. Naturally, this material. The reserve remains for hours in the cylindrical resection chamber, being subjected during this time to several degradation reactions that occur on the cellulose and the NMMO. These degradation products contaminate the i.oipur i f idor material. In addition, during its residence in the cylindrical reserve chamber, this reserve material comes into contact with a relatively large metal surface, which the length / width ratio of the resection chamber is high, which is promotes an ionic ion ion on the contact surface to the cellulose solution. These metal ions can trigger a thermal leak from the decomposition reactions to the point of an explicit decomposition. WO 94 / 0240ß refers to a process for storing a highly viscous, liquid medium in a tank having an adjustable capacity. This storage tank is disadvantageous for moldable cellulose solutions in tertiary amine oxides for two reasons. the first, in a continuous process for the preparation of cellulose objects, the storage of the starting material, 3 say, the thermally unstable cellulose solution in a tank, must be completely avoided. As mentioned above, during the residence time of the cellulose solution, the cellulose and the tertiary amine oxide are subjected to degradation, the products of these deteriorate the quality of the molded bodies. The second, in the proposed tank, is not assured a continuous passage of the highly viscous solution due to its complex configuration. As a result, a flow pattern is formed with areas where a part of the cellulose solution flows faster than in other parts. When using the tank for high viscous cellulose solutions described in UO 94/0240 &;, this flux profile is pronounced that in some places, the j? ión d? Cellulose flows only very slowly or not at all »This is a disadvantage, not only is the residence time of the thermally unstable solution increased, but also the cellulose solution accumulates in some places, the so-called clear volumes, and it is enriched with metal ions due to its contact with metal surfaces, increasing the risk of a decompaction reaction in ensa. Ideally, a device for controlling the pressure in a highly viscous, flowing cellulose should be such that the solution, when passing through the device, passes uniformly like a plug, without adopting any flow profile. In this way, it is an object of the present invention to provide a device for controlling the pressure in a flowing viscous mass that satisfies the following conditions: 1. The device must be capable of responding > immediately after a pressure drop, compensating the additional starting material; this starting material, however, should not be diverted before the mainstream, as is the device according to AT-B 397 043; 2. The device must not have any clear volume where the starting material can accumulate; 3.- The device must have a simple configuration and must be easy to operate; 4.- The device must be designed so that the residence time of the starting material in the device, as short as possible, is to avoid a flow profile according to the part of the visible mass. which is transported at a significantly lower speed; and 5.- The device must be designed in such a way that the starting material has very little contact with the metal surface. The device according to the invention for controlling the pressure in a viscous mass / element is characterized by: - an entrance, through which the mass flows towards the device, - a guide element having a reception capacity for the mass flowing from the inlet, - a piston having an opening, said piston moving within the guide element, the receiving capacity of the guide element being varied by moving the piston, - a receptacle attached to said opening in said piston and attached to the inlet, so that the flowing mass passes from the inlet through the receptacle and the opening of the piston towards the guide element, - an outlet, towards which guide element is led and by means of which the flowing mass is supplied from the device, provided that the inlet, the guide element and the receptacle are designed in the form of a pipe and that the receptacle slides over the entrance like a telescope. noo the piston is A preferred embodiment of the device according to the invention is that the piston is connected to a static mixer that moves in the chime element and moves together with the piston. Preferably, the guide element has a pressure chamber in which a fluid, such as a gas or a hydraulic oil, which is pressurized and capable of moving the piston, can be introduced through an opening. It has been shown that the die composition according to the invention is particularly preferred for use in the processing of cellulose solvents. In this form, the invention also relates to the use of the device according to the invention in the processing of cellulose solutions < T? 1 de bles, where the moldable cellulose solution is used, parculularly a cellulose solution in a NMMQ. Furthermore, the invention relates to an arrangement for the production of molded cellulose bodies, said arrangement comprises: - A mixer wherein a suspension is produced from shredded cellulose / an aqueous solution of a tertiary oxide, - a thin film treatment anarate, which is attached to the mixer by means of a pipe and where, using the thin film technique, -, and evaporates J1L ^ -. > » water < -t starting from the suspension at high temperature and reduced pressure until a cellulose solution is produced, which removes from the thin film treatment apparatus, a device according to the invention linked to the film treatment aoarate. thin either directly or indirectly by means of a pipe and - a forming tool attached to the device according to the invention by means of a pipe. For those skilled in the art, it is evident that the components of the arrangement have been removed. adjusted between them so that a continuous operation is possible. Naturally, the thin-film treatment apparatus, which is bonded to the production of the solution, has to be solved in relation to its hot surface, according to the amount of suspension to be processed. . The arrangement according to the invention is superior since failures can be avoided in the production and during the processing that originates from the pressure variations in the flowing cellulose solution. The applicant has carried out studies regarding the residence times of the suspension ingredients and the cellulose solution in each of the components., entities of the arrangement, discovering that the device according to the invention offers a time of residence siqm f i cativamen and reduced compared with the pH regulator and conventional storage tanks. Also, the device according to the invention can be easily (just at different capacities and output quantities of an arrangement where it is used.) A suitable combination of a thin film treatment apparatus with the device According to the invention, the device according to the invention has to be dimensioned according to the performance through the thin film treatment apparatus, correspondingly, expressed in percentage, to the luxury profile of the film area. length of the apparatus, of the thin film treatment apparatus ("hold-up" >; . A preferred embodiment of a thin film treatment apparatus is a "Filmt rutier" from the company Buss AG, Switzerland. The smallest commercially available Filmtruder has a heat transfer surface of 0.5 12, which allows, according to the description of the company and of 1 as explains ions of EP-AO 356 419 and the procedure parameters described in the same, a nasa yield of 64 to 72 kg / h. This amount corresponds to an output of material and purifier of J? A - 144 g / m '? H. In this Fi imt udec, there will be a hold-up of approximately 2 1, corresponding to approximately 2% of the mass yield, which has become the. pressure compensation volume desirable of the device according to the invention combined with a Fi 1 trude.

Auemás, < It has been found that the volume of desired ion of the detergent according to the invention for the pressure compensation of the anion oxide of 2-61% of the yield of contaminated material, co re ^ conforming to the hold-uo volume of the Fiimtruder, that is, the flow profile of the Film Canvas. Therefore, when S3 uses a large Filmtruder having a hot surface of 40 m- *, the adaptation of the device according to the invention is based on the experience obtained from b'FA- i »356 4-19, a performance of specific mass of 12β-144 l < g / miBh - being multiplied by the hot surface of, eg, 40 m ?, resulting in a mass yield through Filntlruder of 5120-576O | > g / h. In this way, the volume for this large Filmtruder for the device according to the invention will be 100 to 3O0 1, < Due again to the volume of hoid-up of the Due to the fixation of the ratio of length / diameter in the arrangement of the agreement in the field, Dredeble to give those experts in the art, The construction and production of the volume of required pressure compensation can be provided in a simple manner. In this way, the invention also relates to a design for the production of moldable solutions of ceLulose in arourous oxides of metal, faced because it has the combination of: a device for fixing the film, n using the technique d < ? thin film, water is evacuated at an elevated temperature and reduced pressure to one of cellulose in an aqueous tertiary amine oxide until a cellulose solution is orodized, which is removed from the thin film treatment apparatus, and - a Disoasitive according to the invention attached either directly or indirectly to the processed film treatment apparatus by means of a pipe. By means of the drawings, the invention is illustrated in more detail, FIG. 1 shows schematically a design for the production of cellulose fibers moving from a debulked cellulose suspension in an aqueous NMMG? and Figures 2 and 3 show embodiments of the device according to the invention. Figure 1 schematically shows the configuration of a mode of arrangement available according to the invention for the production of a moldable solution of cellulose in aqueous NMMO, which is spun into fibers. It is observed that for clarity rabbits, in the figure the different components of the arrangement are not illustrated at the same scale. In figure 1, the number 1 denotes a mixer, po > -example a cone mixer, in which the shredded cellulose and an aqueous solution of N rlD are fed. The feeding of the same is indicated by means of two arrows. In the cone-1 tertiary, the cellulose and the aqueous solution of JVir-MO were added to form a suspension. The fixture of the cone arm or of the nose cone and the drive element of the mixing arm are shown by a zigzag line and the let to M respectively. The suspension obtained contains 9 to 1 by mass d * -i cellulose, 65 v 63% by mass, respecting NMMO and water for the rest. The suspension is removed by means of a pump 2 and cleaned to a Filzer 3, where by means of the thin film technique, the water is removed, while applying reduced pressure and elevated temperature, until the cellulose dissolves . This type of preparation of the cellulose solution is described in detail in EP-A-0 356 419 of the applicant, to which he will refer for more information. The thin film treatment apparatus is known in the art and is made among other producers by the Buss AG company, Switzerland, under the trade name Fi lmt ruder. By means of a pump 4, the ready cellulose solution is removed from the reference number 6 generally referring to a component of the disposition, which can be provided only once and for all. This may be due to variations in pressure, for example, a device for the addition of additives, which leads to a pressure increase in the spin pump 5a due to the increase in the volume of the flowing cellulose solution. se > - also a tedious device from which part of the «- solution of 16 Cellulose flowing to spinner S is diverted in certain ways for other purposes. This is the case of, v.gc, a backwash filter, which is usually provided upstream to a forming tool, or when switching between two parallelly operated polymer melt-bath filter cartridges, for example when a Filter unit has to be removed in order to be cleaned and it is necessary to switch the other to maintain the flow. Backwash filters are known to those skilled in the art and are described, for example, in EP-A-0 572 369 of the Applicant, or in EP-A-0 250 695. Reference numeral 7 refers to an embodiment of the invention. device according to the invention, which in the present case is attached by a flange to a component 6 of the arrangement. When the cellulose solution is deviated in the compund 6 of the arrangement, this deviated amount of cellulose solution can be compensated by means of the device 7 according to the invention, thus avoiding a pressure drop in the spinner 5. Therefore, it is not necessary to interrupt the spinning process, which can be continued practically under the same pressure, without ignoring the occurrence of spinning. On the other hand, when for some reason the spinner 5 is changed, the flow of the cellulose solution towards the spinner 7 having to be stopped naturally, the device according to the invention is able to compensate the amount of solution of cellulose (discharged by ril truder 3 in the interval where the flow of cellulose solution is interrupted.) Thus, it is not necessary to interrupt the operation of the Filmtruder, without the occurrence of discontinuity in the quality of the cellulose solution. the following, the precise configuration of the device 7 according to the invention and its mode of operation will be described in detail with reference to the figure, Figure 2 shows a section of the device according to the invention in its simplest form. of 4 elements: two blind flanges & and 10, the cylindrical guide pipe 9 and the piston 11, which is movably arranged in the guide pipe The maximum stroke in the direction of movement of the piston 11 is indicated by the letter H and a double arrow, respectively. In Figure 2, the piston 11 is shown in its most rightward position. In the following, this position will be referred to as a minimum position, since in this case only a minimum amount of cellulose solution is taken in the device according to the invention. When the piston 11 is moved to the left by the stroke H, it is located in the maximum position, since in this case a maximum cellulose solution is contained in the device according to the invention. This maximum position of. piston 11 is shown in figure 2 by a dotted line. The piston 11 has a receptacle Ia located on an inlet pipe ña attached to the blind flange ñ which, when the piston 11 moves to the maximum position will progressively slide over the inlet pipe ßa like a telescope. Thus, when the piston 11 moves, it is not only guided by the cylindrical wall 9a of the guide pipe 9, but also by the inlet pipe of the blind flange ñ. The mode of operation of the device according to the invention is as follows: The cellulose solution flows, e.g., from the disposing component 6 shown in Figure 1 through the inlet pipeline which has at its end a conical elongation and through the receptacle and leave the positive according to the invention through the outlet pipe 10a attached to the blind flange 10 and directly leading to the spinner (not shown). When it is the case of exchanging the spinner, the loading of the cellulose solution from the outlet pipe 10a has to be stopped, the pressure of the cellulose solution which continues to flow steadily through the pipeline could be increased. entrance to the device according to the invention. Nevertheless, this increase in pressure is compensated by means of the displacement of the piston 11, according to the amount of cellulose solution fed, towards the left towards the maximum position. In this way, this measurement provides a space for the cellulose solution to flow into the device in accordance with the invention, while the spinner is changed. When the new spinner is in operation, the styrofoam drawer opens, the movement of the piston 11 if it is stopped, thus restoring the spinning odor, for which the cellulose solution is altered. again with fluid from the outlet pipe 10a to the spinner. The cellulose solution compensated by the device according to the invention in its yoke line 9 during the stopping of the spinning operation, can be further fed to the spinner by moving towards the minimum position, this step is carried out for a prolonged period so as not to significantly increase the pressure and output amount in the spinner. On the other hand, when for some reason the cellulose feed into the inlet pipe has to be reduced, a first resection of the cellulose solution is carried out by the device according to the invention, the. i st on 11 moving towards its maximum position, thus providing a space for said stock of cellulose solution. When the supply of cellulose solution to the inlet pipe is subsequently reduced, eg to remove the cellulose solution for other purposes (eg, to remove a filter), a fall can be prevented. The pressure in the cellulose solution caused by this measurement affects the spinner by the movement of the piston 11 at an appropriate speed to the minimum position, but the transport of the cellulose solution by the pulley is increased. outlet 10a to the spinner Fn a state of operation where it is desired to respond immediately to variations of positive or negative pressure, the piston 11 is preferably located in a position between the minimum position and the maximum position Fn this position, a fall Sudden pressure in the inlet pipe can be compensated immediately by moving the piston 11 to the minimum position.It is important that the amount of solvent solution needed a for the compensation of the pressure drop does not derive from a volume of light, as is the case with AT-B -397 43, but from a space through which flow and the cellulose solution flow , where the cellulose solution is constantly renewed and in this way na gets old. An increase in renent pressure in the outlet pipe 10a can see <; or thought by the immediate uvimiento of the piston towards the maximum position. In the following, some facets of construction of the device according to the invention will be described in greater detail. The movement of the piston 11 is controlled by means of an inert gas or by means of a hydraulic oil fed to the pressure chamber 9c in the opening of the bias 9b of the guide pipe 9. When it is desired to move the piston 11 towards the position At a minimum, the pressure of gas in the pressure chamber 9c should be greater than the pressure prevailing in the solution of: elulosa. On the other hand, the piston 11 can be moved to the maximum position by reducing the gas pressure below the pressure of the cellulose solution. Conveniently, the gas pressure is continuously controlled. In this way, it is also possible to move the piston 11 continuously. The adjustment of the gas pressure can be carried out in a known manner, v. The sealing of the pressure chamber 9c against the cellulose solution in the receptacle as shown on an enlarged scale by means of the Figure 2a, consisting of a sealing ring ñd attached to the inlet pipe ña and a friction ring fie, which prevents a co-ion of the sealing ring ñd. Pa < At the back of the wiper ring, a yoke tube is attached to the inlet pipe. The sealing of the cellulose solution against the pressure chamber 9c can also be seen in detail in figure 2a, consisting of a sealing ring ñh having a section in the form d = U that prevents the penetration of cellulose solution into the chamber of pressure 9c. Directly behind the sealing ring 9b, a guide ring ñc is located to guide the receptacle 1Ja towards the inlet pipe. A space ñf between the guide rings ñc and ñh as well as the recentácul or lia and the inlet pipe ña, is provided for the rinsing and lubrication and t fed Lon-Lubricant through the lubrication conduit ñg. L-1 lubricant is withdrawn J through conduit ñi (see figure 2). The sealing of the cellulose solution against the pressure chamber 9c on the piston 11 is shown on an enlarged scale by means of FIG. 2b and is also effected by means of a sealing ring 11b which has a shaped section. of U. For behind the signal a guide ring J le. The pressure chamber of the pressure chamber 9c against the solution of.: Elulase is not shown in figure 2b and is conveniently disposed anaJogly to the case shown in figure 2a (Ad sealing ring, wiper ring ñ and guide ring ñh ). For the sealing of the pressure chamber 9c and the cellulose solution against the surrounding aspects, in the blind flanges ñ and 10, means 0 are provided in a known manner. The position of the piston 11 within the device according to the invention can be determined in a known manner, that is, by means of a transonic displacement transducer ñ] (Figure 2a) d3l type of BALLUF BTL (made by the Balluf Company) , Germany), fixed inside the blind flange ñ. The setter block & r is attached to the receptacle 1 through a ring Al, so that any receptacle location between the minimum position and the maximum position of the piston 1L is. The signal provided by the transonic displacement transducer can be used as a control signal in a variety of ways. Each of the two blind flanges ñ v LO and the guide pipe 9 have heating jets Am, Job and d, respectively, by means of which they can be heated indirectly from the outside. The rigid connection of the blind flanges ñ and 10 to the guide pipe 9 loq < in a known manner by means of screws, which are introduced through holes An, 10 and 9e respectively. A preferred embodiment of the device according to the invention is shown in figure 3 by means of a section, wherein the components of the device are also indicated in figures 2, 2a and 2b which have been designated on the identical reference numbers. The fashion shown in Figure 3 differs from that shown in Figure 2 by another guideline pipe. (second) prosista between the blind flange 10 v the pipe of chia ; of figure 2 and by a static generator 11b molded to the circumference of the piston 11 and moving together with the piston 11. The static mixer is a pipe where def readers are provided that affect the flow of the cellulose solution, so that it does not basically exhibit a profile, that is, that it flows with a plug. Di icts of the Static Tertiary are known and made, v. gr., by the Sulzer Chemtech Company, 5u? za ,. In the figure, the deflectors are indicated by means of two crossovers.

Fn the minimum piston position 11 t < In step 3, the static mixer 11b is completely submerged in the second pipeline Ce 12, in this position finally closing with the blind flange 10. Sealing the cellulose solution against the pressure chamber 9c at the end The front of the static cleaner is initially arranged analogously to the seal on the piston 11 shown in FIG. 2b, that is, by means of a ring that has a piston-shaped ring. U to which is attached a guide ring both not shown). The sealing of the pressure chamber 9c against the cellulose solution is provided in the external circumference of the static mixer 11b by means of a sealing ring and is shown on an enlarged scale in the tray 13a. Also in this case, immediately behind the sealing ring 11c, a lid wiper ring is provided for the protection of the sealing ring 11c against co-amination. The static mixer 11b < s conducted in the second pipe of yury 12 by credit of the guide ring lie behind it. A l-llf is provided for lubrication, feeding and removal of Jubnrante taking place through the openings 1 b and 12c respectfully. The static mixer can be heated directly from the outside by means of a slow, open jacket 12a. It has been shown that the incorporation of an asthmatic mixer into the device according to the invention is particularly advantageous for processing. thermally unstable cellulose solutions in order to obtain a good plug flow and reduced residence time. In addition, it is also advantageous to use static mixers in which the inner parts can be fed with heating medium / e f rity, thus it being possible to further heat / cool the cellulose solution f lu e t e.

Claims (1)

1. 2ñ NOVELTY OF THE INVENTION CLAIMS • 1. Dispersive Ijp for controlling the pressure in a flowing viscous mass, said charcterial device because it comprises: an inlet? Through which the mass flows towards the device, an element of the yuia (9, J2) having a Reasonable capacity for the mass flowing from said inlet 0 ña), a piston (11) qu > d has an opening (lid), said piston being left of the yoke element (9, J2), the receiving capacity of said guide element (9, 12) being emptied by moving the piston (11), a receptacle ( lia) attached to said opening (lid) in said piston (11) and connected to the inlet (ña), 5 in order that the flowing mass passes from said inlet (ña) through said receptacle (lia) and through said overture 'lid) of the piston (11) towards said guide element (9, 12) a . 1 ida (ICa) to which the said yuy element leads (9, 12) and whereby the fluvial mass is discharged from the disoositive, provided that said inlet (ña), said yoke element (9, J2) and said receptacle (lia) are designed in a pipe form and that said receptacle (lia) slide over said entrance (ña) like a telescope when said piston \ JJ) moves. - 2. A device according to claim 1, further characterized in that said piston (11) is connected to a line 1 < . > static? l l b) that moves inside rl - chia element f12) v that moved with the piston il). 3. A device according to one of claims 1 or 2, further side because said guide element (9) has a pressure chamber ^ c) where through an opening (9b) a fluid can be fed. being rapacious to move said piston (11). 4. The use of a device in accordance with one or i of claims 1 to 3 in an arrangement for the production of moldable cellulose sojucts. 5. The use according to claim 4, further characterized in that a solution of cellulose in an aqueous ternary amine oxide is used as a moldable cellulose solution. 6. An arrangement for the production of aqueous-based tertiary amine oxide cellulose solutions, based on the combination of a thin-film treatment apparatus (3), wherein, using the thin-film technique HE ? . to water the suspension at elevated temperature and reduced pressure until a cellulose solution is produced, which is removed from the thin film treatment apparatus (3), and a device (7) according to one of the claimed ions 1 to 3 attached to said thin film treatment step (3) either directly or indirectly by means of a filter. 7. An arrangement for the production of n-pjlueted bodies of cellulose, said arrangement characterized in that it comprises: a nezclador (1), e where a suspension is produced from shredded cellulose and an aqueous tertiary amine oxide, a film treatment apparatus thin (3) attached to said mixer (1) by means of a pipe and where using the thin film technique evaporates water from the suspension at elevated temperature and reduced pressure until it produces a cellulose solution, which is removed of the thin film treatment apparatus (3), a device (7) according to one of claims 1 to 3, attached to said thin film treatment apparatus (3) either directly or indirectly by means of a tube and a forming tool (5) attached to said device (7) according to one of claims 1 to 3 by means of u uber í. DEVICE AND DISPOSAL FOR USE IN THE PROCESSING OF CELLULOSE SOLUTIONS SUMMARY OF THE INVENTION The invention relates to a device for controlling the pressure in a flowing viscous mass, said distributed solvent: an input (Aa) through which the mass flows towards the device, an element of the yuin? , 1,?) E has a receiving capacity for the mass flowing from di inlet * fta), a piston (Ji) having an opening (lid), said piston moves inside said guide element (9). , J2) The receiving capacity with the yoke element (9, 12) being varied by the movement of said piston (11), a recelact (lia) attached to the opening (lid) in said piston (1 1) and attached to said inlet (Aa) of marera that the flowing mass passes from the entrance (ña) through the receptacle (lia) through said opening (lid) of the piston (11) to the ele- guide (9, 12), an outlet (10a) towards which said guide element (9, 12) leads and by means of which the flowing mass is discharged or the device, provided that said entrance (Aa), said element guide (9, 12) and said receptacle JaJ are designed in a pipe-form urn and said rezeotaculp (lia) slides over the entrance (ña) ca to a tel (=> scsmo when said piston (11) ~ < to move PD / c rm # f! ivs *? euh *