EP1299579A1 - Vorrichtung und verfahren zum sicheren fördern und handhaben von spinnfähigen celluloselösungen - Google Patents
Vorrichtung und verfahren zum sicheren fördern und handhaben von spinnfähigen celluloselösungenInfo
- Publication number
- EP1299579A1 EP1299579A1 EP00981147A EP00981147A EP1299579A1 EP 1299579 A1 EP1299579 A1 EP 1299579A1 EP 00981147 A EP00981147 A EP 00981147A EP 00981147 A EP00981147 A EP 00981147A EP 1299579 A1 EP1299579 A1 EP 1299579A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- cellulose
- switching point
- switched
- control system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D1/00—Treatment of filament-forming or like material
- D01D1/02—Preparation of spinning solutions
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D1/00—Treatment of filament-forming or like material
- D01D1/06—Feeding liquid to the spinning head
- D01D1/09—Control of pressure, temperature or feeding rate
Definitions
- the invention relates to a device and a method for the safe conveying and handling of a cellulose solution which is suitable for the production of solvent-spun cellulosic moldings, in particular for the production of fibers, films and membranes.
- a cellulose solution comprising pretreated cellulose, a non-solvent for cellulose, such as water, and a solvent for cellulose, such as tertiary amine oxides, in particular N-methylmorpholine-N-oxide, and optionally other spinning aids are prepared to give a spinnable solution, hereinafter referred to as spinning solution ,
- spinning solution This mixture only maintains its spinnability if it is kept in a temperature range between about 70 ° Celsius and 120 ° Celsius.
- Spinnability is understood to mean the property of spinning the solution into shaped bodies in the dry-wet extrusion process.
- the production of cellulosic molded articles from such solutions is described, for example, in EP-A-0 574 870.
- the aforementioned methods have clear advantages over other methods for producing fibers, foils and membranes.
- moldings can be produced which are superior to conventional moldings, such as viscose, in many respects.
- the method also allows the molded articles to be produced continuously.
- ecological advantages are to be emphasized, since essentially no chemicals that are harmful to health or the environment are used or fall off in these processes for producing solvent-spun cellulosic moldings.
- the known methods and devices for producing solvent-spun cellulosic moldings also have disadvantages.
- the mixtures of cellulose, tertiary amine oxides and water tend to undergo violent decomposition reactions, the so-called runaway, at higher temperatures.
- the decomposition usually occurs after a fluctuating induction time, which is why the timing and temperature of the reaction run-through are difficult to predict in practice.
- heating devices which are primarily, but not exclusively, attached to the outside of said assemblies.
- electrical heating systems are known. Hot water are still known
- Heating devices in which the necessary heat is generated by means of pipes through which hot water flows or the double walls of the assemblies the spinning solution is transferred.
- safety devices These safety devices are bursting devices that are installed in selected locations. Relaxation rooms or relaxation tanks are also used to accommodate the relaxing spinning solution. Conventional safety devices of this type are not only cost-intensive, but their effect is limited exclusively to restricting the effects of going through the spinnable cellulose solution in such a way that the conveying devices are not destroyed. At the same time, the safety of the operating personnel is guaranteed.
- the safety devices according to the prior art thus have the disadvantage that their effect is limited to the effects of going through the spinning solution and not going through the To prevent spinning solution itself.
- the object of the present invention is to overcome the disadvantages of the prior art and to provide a safety device and a method which prevents the production mixture from going through.
- Another object of the present invention is to provide a safety device and a method for the production of solvent-spun cellulosic moldings, which prevents the spinnable cellulose solution from going through and has no disruptive influence on the conveying, handling and production process, e.g. that the production process must be interrupted unnecessarily.
- a further object of the present invention is to provide a safety device and a method which require the use of costly bursting devices and / or
- the invention is based on the finding that local overheating of a limited amount of the spinning solution does not immediately lead to the entire system going through. Furthermore, it is based on the knowledge that a uniformly high temperature level in the entire system or at least in a sufficiently large volume is required for the passage of the substances or the mixture.
- the present invention goes the way to prevent passage of the spinning solution by continuously monitoring the temperature of the spinning solution in the individual sectors or assemblies of the devices and depending on preset parameters, the temperature of the hot water of the heating device is lowered and / or cooling water is fed into the heating device.
- the temperature of the spinning solution is lowered to such an extent that it is no longer possible to go through the spinning solution.
- the temperature of the spinning solution is carried out in such a way that the minimum temperature required for the spinning process is not fallen below, which advantageously both avoids the dangerous situation of running through the spinning solution and at the same time does not interrupt the production process.
- the temperature of the hot water of the heating device is reduced and the cooling water is fed into the piping system of the heating device in stages.
- the temperature of the hot water of the heating device is continuously reduced, the temperature of the hot water falling below the temperature of the spinning solution in order to achieve a relative cooling with the associated heat transfer from the spinning solution into the hot water, ie lowering the temperature to reach the spinning solution.
- the lowering of the temperature of the hot water can be achieved by basically known measures, such as the use of heat exchangers. Partial feeding of cooling water into the hot water of the heating system is also possible. However, the latter does not allow process heat to be recovered. If the measures of the first stage are successful and the temperature of the spinning solution returns to the preset, desired temperature range for spinning, the safety method according to the invention is completed and the trace heating system is operated in its technologically normal mode.
- the measures of the first stage do not bring the temperature of the spinning solution into the desired temperature range mentioned and if the temperature of the spinning solution exceeds a second preset limit temperature which is higher than the first preset limit temperature, the measures of the second stage of the safety method according to the invention are triggered ,
- the measures of the second stage of the safety process are also triggered if the temperature rise in the spinning solution is so rapid that the second preset limit temperature is exceeded before the measures of the first stage can be initiated or can take effect.
- the supply of the hot water to the heating system is essentially interrupted and cooling water is fed into the pipe system of the heating system.
- the cooling water has a temperature that is significantly below the temperature of the hot water, even if the hot water temperature has been modified by the measures of the first stage.
- the choice of the temperature of the cooling water is not subject to any significant restrictions, but it should be noted that on the one hand the temperature of the cooling water should be as low as possible in order to ensure the greatest possible heat dissipation from the spinning solution and thus prevent the spinning solution from going through and on the other hand the temperature of the cooling water must be high enough so that the thermal stress of the production facility and / or the pipe systems does not increase to an extent that leads to damage to the pipe system or other parts of the production device. Such damage can be, for example, stress cracks due to the temperature change.
- the specialist can determine the temperature of the cooling water based on his specialist knowledge as well as simple tests that are within the range of what is customary and reasonable in the trade, and when it is fed in there is no damage to the production equipment and at the same time adequate heat dissipation from the spinning solution is ensured.
- a suitable temperature of the cooling water is 20 ° C.
- the aforementioned measures can be carried out in such a way that both the entire production system and only individual groups, i.e. Spinning device, mixing container, storage container, feed lines and other, are affected by the inventive method.
- a conventional production device for the production of solvent-spun cellulosic moldings from a cellulose solution, comprising pretreated cellulose, a non-solvent for cellulose and a solvent for cellulose, equipped with a hot water heating system was provided with temperature sensors for measuring the temperature of the spinning solution.
- the facility is divided into individual sectors, for example pipeline sections, mixing kettles, extruders and others, each of which absorb amounts of spinning solution which are sufficient to cause the spinning solution to run through.
- At least one temperature sensor is arranged in each of the sectors thus created. To increase security, several sensors can be arranged in one sector.
- the temperature sensors are preferably so-called double sensors.
- Double sensors include two temperature sensors, which measure the temperature of the spinning solution at almost the same location and emit a temperature signal to the system control, the temperature sensors of this pair of sensors continue to compare the measurement results with one another and, if the measurement results differ from one another, emit a separate signal.
- the separate signal also known as a defect signal, indicates to the system controller that a temperature sensor has failed.
- the system control is connected to the individual trace heating systems via a safety circuit, which can be switched off automatically by the system control by displaying a defect signal.
- the embodiment of the present invention with double temperature sensors leads to a further increase in safety. Suitable temperature sensors are commercially available under the name PT-100.
- the sensors Local overheating of the spinning solution in at least one of the sectors is detected by the sensors and the temperature values are transmitted to the safety circuit.
- the preset parameters of the first limit temperature and the second limit temperature are specified as switching points. The parameters mentioned are variably adjustable and are set depending on the spinning solution used.
- a first limit temperature of 98 ° C was specified as the first switching point. Exceeding the temperature of the spinning solution above the first switching point caused the performance of the heat exchangers to be increased by reducing the cooling water flow rate the heat exchanger has been switched to the maximum.
- the hot water temperature of the trace heating was lowered and the cooled amount of water of the trace heating caused heat transfer between the locally overheated spinning solution and the now cooler heating water.
- this safety position could be acknowledged, both automatically and manually, and the trace heating was adapted to the normal technological regime.
- a second limit temperature of 100 ° C was specified as the second switching point. This switching point is reached if the measures do not take effect after the first switching point has been reached.
- the hot water supply to the temperature control system was switched off and the hot water was simultaneously withdrawn and cooling water fed in.
- the second switching point automatically switched two three-way ball valves.
- a separate emergency cooling water system was integrated into the affected heating system via the changed ball valve position.
- the emergency cooling water system consists of a cooling water tank, a pressure-dependent feed pump and the supply system. In the normal state, the emergency cooling water system was under a predetermined system pressure. The feed pump was switched via a pressure diaphragm to keep the set system pressure constant.
- the switching of the three-way ball valves caused a pressure drop in the cooling water system, causing the feed pump of the cooling water system was switched.
- the cooling water fed in by means of a feed pump displaced the hot water in the heating water system, whereby the temperature of the spinning solution in the affected sectors was cooled down by feeding in the cold water (20 ° C.).
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
- Artificial Filaments (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10033406A DE10033406A1 (de) | 2000-07-08 | 2000-07-08 | Vorrichtung und Verfahren zum sicheren Fördern und Handhaben von spinnfähigen Celluloselösungen |
DE10033406 | 2000-07-08 | ||
PCT/DE2000/003665 WO2002004718A1 (de) | 2000-07-08 | 2000-10-18 | Vorrichtung und verfahren zum sicheren fördern und handhaben von spinnfähigen celluloselösungen |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1299579A1 true EP1299579A1 (de) | 2003-04-09 |
Family
ID=7648365
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00981147A Withdrawn EP1299579A1 (de) | 2000-07-08 | 2000-10-18 | Vorrichtung und verfahren zum sicheren fördern und handhaben von spinnfähigen celluloselösungen |
Country Status (9)
Country | Link |
---|---|
US (1) | US7217317B1 (de) |
EP (1) | EP1299579A1 (de) |
CN (1) | CN1271253C (de) |
AU (1) | AU2001218500A1 (de) |
DE (1) | DE10033406A1 (de) |
MY (1) | MY128679A (de) |
TW (1) | TW482834B (de) |
WO (1) | WO2002004718A1 (de) |
ZA (1) | ZA200202669B (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1738446B1 (de) * | 2004-04-03 | 2011-09-14 | KraussMaffei Technologies GmbH | Wassergekühlte steuereinrichtung für eine spritzgiessmaschine |
US20090051068A1 (en) * | 2006-01-12 | 2009-02-26 | Thüringisches Institute Für Textil-Und Kunststoff-Forschung E.V. | Method for Producing Molded Bodies from Proteins |
CN102286796A (zh) * | 2011-08-09 | 2011-12-21 | 苏州龙杰特种纤维股份有限公司 | 一种制备ptt海岛纤维的设备 |
CN102650079A (zh) * | 2012-03-20 | 2012-08-29 | 桐昆集团浙江恒盛化纤有限公司 | 熔体直纺的长距离输送方法及系统 |
CN109629013A (zh) * | 2018-12-18 | 2019-04-16 | 淮安天然丝纺织科技有限公司 | 一种溶解机温度控制系统 |
CN113107811B (zh) * | 2021-04-08 | 2023-05-16 | 广东韶钢松山股份有限公司 | 平稳倒换真空泵的方法 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB348168A (en) * | 1929-01-09 | 1931-05-04 | Samuel Wild | Improvements in or relating to the manufacture of artificial silk |
US2644195A (en) * | 1949-05-14 | 1953-07-07 | Celanese Corp | Method and apparatus for forming films |
US4177105A (en) * | 1973-05-22 | 1979-12-04 | Kamyr, Incorporated | Apparatus for delignifying and bleaching cellulose pulp |
AT396575B (de) * | 1985-09-16 | 1993-10-25 | Engel Kg L | Verfahren zur werkzeugtemperierung für die formwerkzeuge von spritzgiessmaschinen |
DE4309880C2 (de) * | 1993-03-26 | 1995-09-21 | Riesselmann F & H Kunststoff | Verfahren und Anlage zur Temperierung von Formwerkzeugen für die Kunststoffverarbeitung |
US5354371A (en) * | 1993-05-28 | 1994-10-11 | Courtaulds Fibres (Holdings) Limited | Transport of solutions of cellulose through pipes |
AT408547B (de) * | 1995-09-26 | 2001-12-27 | Chemiefaser Lenzing Ag | Verfahren zum transportieren einer lösung von cellulose in einem wässrigen tertiären aminoxid |
GB2319495A (en) * | 1996-11-26 | 1998-05-27 | Courtaulds Fibres | Method and apparatus for the manufacture of lyocell fibres |
US6350614B1 (en) * | 2000-02-07 | 2002-02-26 | Concept Sciences, Inc | System for the ion exchange purification of hydroxylamine |
-
2000
- 2000-07-08 DE DE10033406A patent/DE10033406A1/de not_active Ceased
- 2000-10-18 AU AU2001218500A patent/AU2001218500A1/en not_active Abandoned
- 2000-10-18 US US10/332,492 patent/US7217317B1/en not_active Expired - Lifetime
- 2000-10-18 WO PCT/DE2000/003665 patent/WO2002004718A1/de not_active Application Discontinuation
- 2000-10-18 EP EP00981147A patent/EP1299579A1/de not_active Withdrawn
- 2000-10-18 CN CNB008169616A patent/CN1271253C/zh not_active Expired - Lifetime
- 2000-11-17 MY MYPI20005394A patent/MY128679A/en unknown
-
2001
- 2001-02-13 TW TW090103132A patent/TW482834B/zh not_active IP Right Cessation
-
2002
- 2002-04-05 ZA ZA200202669A patent/ZA200202669B/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO0204718A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN1271253C (zh) | 2006-08-23 |
AU2001218500A1 (en) | 2002-01-21 |
CN1451059A (zh) | 2003-10-22 |
WO2002004718A1 (de) | 2002-01-17 |
US7217317B1 (en) | 2007-05-15 |
MY128679A (en) | 2007-02-28 |
ZA200202669B (en) | 2003-09-29 |
DE10033406A1 (de) | 2002-01-17 |
TW482834B (en) | 2002-04-11 |
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Owner name: ZIMMER AG |
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