JP3219445B2 - Drying method for hollow fiber bundles - Google Patents
Drying method for hollow fiber bundlesInfo
- Publication number
- JP3219445B2 JP3219445B2 JP02535892A JP2535892A JP3219445B2 JP 3219445 B2 JP3219445 B2 JP 3219445B2 JP 02535892 A JP02535892 A JP 02535892A JP 2535892 A JP2535892 A JP 2535892A JP 3219445 B2 JP3219445 B2 JP 3219445B2
- Authority
- JP
- Japan
- Prior art keywords
- hollow fiber
- fiber bundle
- drying
- air
- bundle
- 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.)
- Expired - Fee Related
Links
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
- Artificial Filaments (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は中空繊維束の製造時など
における、中空糸内に含む溶剤や、水分を蒸発させる乾
燥処理を、短時間で効率よく行う方法、およびそれに用
いる乾燥装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for efficiently performing a drying treatment for evaporating a solvent and water contained in a hollow fiber in a short time, for example, in the production of a hollow fiber bundle , and a method for using the same.
Drying equipment .
【０００２】[0002]
【従来の技術】排水処理、純水の製造、海水の淡水化
や、人工腎臓および血しょう分離といった分野に、限外
ろ過膜、逆浸透膜などろ過膜を組み込んだ膜分離装置が
用いられており、この様なろ過膜として中空繊維が広く
適用されている。この中空繊維を製造するプロセスなど
において、中空繊維を湿式紡糸法で製造する場合などは
脱溶媒のため、水等による中空繊維の洗浄処理が必須で
ある。ところで、この中空繊維を洗浄処理した後、中空
繊維束を膜分離装置として組み立てる工程において、水
その他の洗浄溶剤を乾燥させる必要がある。2. Description of the Related Art In the fields of wastewater treatment, production of pure water, desalination of seawater, and artificial kidney and plasma separation, membrane separation devices incorporating filtration membranes such as ultrafiltration membranes and reverse osmosis membranes have been used. Therefore, hollow fibers are widely used as such a filtration membrane. In the process of producing the hollow fiber, for example, when the hollow fiber is produced by a wet spinning method, a washing treatment of the hollow fiber with water or the like is indispensable for desolvation. By the way, after the hollow fibers are washed, it is necessary to dry water and other washing solvents in the process of assembling the hollow fiber bundle as a membrane separation device.
【０００３】従来、この様な中空繊維束の乾燥処理は単
に加熱空気を循環する恒温槽内に中空繊維束を静置する
ことにより行われており、繊維束内部が完全に乾くまで
長時間を要し、中空繊維束を多量生産する為にはきわめ
て大型の恒温槽が必要となる欠点が有った。Conventionally, such a drying treatment of the hollow fiber bundle is performed simply by leaving the hollow fiber bundle in a thermostat circulating heated air, and it takes a long time until the inside of the fiber bundle is completely dried. In short, in order to produce a large amount of hollow fiber bundles, there is a disadvantage that an extremely large thermostat is required.
【０００４】[0004]
【発明が解決しようとする課題】多量に中空繊維を生産
する為には、短時間で効率良く中空繊維束から水その他
の洗浄溶剤を蒸発させる乾燥方法が工業的に重要であ
る。しかし従来、中空繊維束を短時間で乾燥させる方法
または装置が知られていない事から、本発明の目的は中
空繊維束を短時間で効率良く乾燥する方法、および装置
を提供する事にある。In order to produce a large amount of hollow fibers, a drying method for efficiently evaporating water and other cleaning solvents from the hollow fiber bundle in a short time is industrially important. However, since a method or an apparatus for drying a hollow fiber bundle in a short time is not known, an object of the present invention is to provide a method and an apparatus for efficiently drying a hollow fiber bundle in a short time. It is in the thing.
【０００５】[0005]
【課題を解決するための手段】本発明は中空繊維内強制
通気による、中空繊維束の乾燥方法と装置に関するもの
である。すなわち、この発明は、 （１） 中空繊維束製造時に、切り揃えられた中空繊維
束の端部から、乾燥用空気を中空繊維内部へ強制的に通
気する、中空繊維束の乾燥方法であって、中空繊維束が
中空繊維束端部へ乾燥用ガスを導く通気筒内に挿入さ
れ、かつ、少なくとも中空繊維束の端部外周と該通気筒
との間隙部が封止された状態であることを特徴とする中
空繊維束の乾燥方法。 （２） 中空繊維束端部へ乾燥用ガスを導く通気筒と、
通気筒へ乾燥用ガスを送るファンと、乾燥用ガスの供給
温度検出装置および中空繊維束の他端から排気されるガ
スの温度検出装置とを有する中空繊維束の乾燥装置、に
関するものである。 本発明において、内部が液体で濡れた中空繊維の束の、
例えば一端から、乾燥用ガスを、好ましくは加熱した乾
燥用ガスを、圧力損失の程度に応じて、６００ｍｍＨ2
Ｏ以下であれば遠心ファンや軸流ファンを用い、これを
超えるときは回転ブロワーなどを用い、強制的に中空繊
維内部を通過させ、中空繊維内部に含まれる液体を蒸発
乾燥させる。SUMMARY OF THE INVENTION The present invention relates to a method and an apparatus for drying a hollow fiber bundle by forced aeration in the hollow fiber. That is, the present invention provides (1) a method for drying a hollow fiber bundle, in which drying air is forcibly ventilated into the inside of the hollow fiber from the end of the cut hollow fiber bundle during the production of the hollow fiber bundle. , The hollow fiber bundle
Inserted into a ventilation tube that guides drying gas to the end of the hollow fiber bundle
And at least the outer periphery of the end of the hollow fiber bundle and the ventilation tube
The method for drying hollow fiber bundles, characterized in that the gap between the fiber bundles is sealed . (2) a ventilation tube for guiding a drying gas to the end of the hollow fiber bundle;
The present invention relates to a drying apparatus for a hollow fiber bundle having a fan for feeding a drying gas to a ventilation tube, a temperature detecting device for supplying a drying gas, and a temperature detecting device for gas exhausted from the other end of the hollow fiber bundle. In the present invention, the inside of a bundle of hollow fibers wet with a liquid,
For example, from one end, a drying gas, preferably a heated drying gas, is supplied at a pressure of 600 mmH 2 depending on the degree of pressure loss.
If it is O or less, a centrifugal fan or an axial fan is used, and if it exceeds this, a rotary blower or the like is used to forcibly pass through the inside of the hollow fiber and evaporate and dry the liquid contained in the hollow fiber.
【０００６】本発明において、中空繊維束とは、略一定
の長さに切り揃えられた中空状の繊維の束を言い、例え
ばポリアクリルニトリルやポリスルホンなどの合成高分
子や、セルロース系の再生高分子による中空繊維ろ過膜
の束が典型的なものであるが、その材質や繊維本数、又
は繊維断面の形状、寸法、膜厚、又は繊維束の長さおよ
び繊維束の形状は特に限定されない。例えば、中空繊維
の内径は人工腎臓に用いられる約１００μｍのものから
限外濾過膜に用いられる０．５〜５ｍｍのものまでなど
がある。さらに、乾燥用ガスの種類や温度、中空繊維内
の通気速度、蒸発させる溶剤の種類なども特に限定され
ない。前記通気速度は例えば０．５ｍ／秒以上がよい。
好ましい範囲は繊維形状などにより異なるが、例えば
０．５〜１０ｍ／秒である。In the present invention, the hollow fiber bundle refers to a bundle of hollow fibers cut to a substantially constant length, for example, a synthetic polymer such as polyacrylonitrile or polysulfone, or a cellulose-based recycled fiber. Although a bundle of hollow fiber filtration membranes made of molecules is typical, the material, the number of fibers, or the shape, size, and film thickness of the fiber cross section, the length of the fiber bundle, and the shape of the fiber bundle are not particularly limited. For example, the inner diameter of the hollow fiber ranges from about 100 μm used for an artificial kidney to 0.5 to 5 mm used for an ultrafiltration membrane. Further, the type and temperature of the drying gas, the ventilation speed in the hollow fiber, the type of the solvent to be evaporated, and the like are not particularly limited. The ventilation speed is preferably, for example, 0.5 m / sec or more.
The preferred range depends on the fiber shape and the like, but is, for example, 0.5 to 10 m / sec.
【０００７】[0007]
【実施例】以下、図示した実施例に基づいて具体的に本
発明を説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be specifically described based on the illustrated embodiments.
【０００８】[0008]
【実施例１】図１は、中空繊維束の乾燥に本発明を適用
した例の概略図である。図１において、乾燥機本体
（１）内に設けた通気筒（４）に、液体で濡れた中空繊
維束（２）を装着する。この時、封止材（３）を中空繊
維束（２）に巻き付け、中空繊維束（２）と通気筒
（４）間に隙間を生じない様にする。吸気用遠心ファン
（６）によりフィルター（５）を通して吸気した空気
（１８）は、ヒーター（７）により所定の温度に加熱
し、通気筒（４）を通して中空繊維束（２）の上端部か
ら強制的に中空繊維束内部に供給し、中空繊維を通過し
て下端部から系外に排気する。（８）は供給空気の温度
検出装置であり、（９）はスチーム（１７）の流量制御
バルブである。排気された空気は中空繊維束（２）に含
まれる水分を蒸発させその潜熱により温度が下がるが、
乾燥が完了するにつれ排気される空気（１９）の温度は
上昇し、乾燥が完了すると供給空気温度とほぼ同一温度
に到達する。（１０）は、この排気温度の検出装置であ
り、乾燥完了のモニターである。Embodiment 1 FIG. 1 is a schematic view of an example in which the present invention is applied to drying of a hollow fiber bundle. In FIG. 1, a hollow fiber bundle (2) wet with a liquid is attached to a ventilation tube (4) provided in a dryer body (1). At this time, the sealing material (3) is wound around the hollow fiber bundle (2) so that no gap is formed between the hollow fiber bundle (2) and the ventilation tube (4). Air (18) which is air through a filter (5) by suction for a centrifugal fan (6) is by the heater (7) heated to a predetermined temperature, from the upper end of the middle empty fiber bundle (2) through through-cylinder (4) It is forcibly supplied into the hollow fiber bundle, passes through the hollow fiber, and is exhausted from the lower end to the outside of the system. (8) is a supply air temperature detecting device, and (9) is a flow control valve of the steam (17). The exhausted air evaporates the moisture contained in the hollow fiber bundle (2) and the temperature decreases due to the latent heat.
As the drying is completed, the temperature of the exhausted air (19) rises, and when the drying is completed, it reaches almost the same temperature as the supply air temperature. (10) is an exhaust temperature detecting device, which is a monitor for completion of drying.
【０００９】また、通気筒（４）から供給する熱風量が
十分に多量で、中空繊維束の端部から排出されてくる空
気温度が高い場合には、系外に全てを排気せず排出空気
を循環して再加熱し、供給空気として利用する方が熱的
に有利な事もあり、状況に応じて設計する事ができる。
但しこの場合、供給空気を循環利用するため湿度が高ま
り、中空繊維束の乾燥速度は遅くなる。If the amount of hot air supplied from the ventilation tube (4) is sufficiently large and the temperature of the air discharged from the end of the hollow fiber bundle is high, the exhaust air is not exhausted to the outside of the system but exhausted. It may be thermally advantageous to circulate and reheat and use it as supply air, so that it can be designed according to the situation.
However, in this case, since the supply air is circulated, the humidity increases, and the drying speed of the hollow fiber bundle decreases.
【００１０】[0010]
【実施例２】図２は図１の方法に、乾燥機本体内部の空
気を加熱して循環する事を付加し、乾燥速度を加速する
方法である。即ち、図２において（１１）は乾燥機本体
内の空気を循環させるための循環ファン、（１２）は循
環空気（２０）を加熱するためのヒーター、（１３）は
循環空気温度の検出装置、（１４）はスチームの流量制
御バルブである。また（１５）、（１６）はそれぞれ循
環空気の給、排気ダンパーである。Embodiment 2 FIG. 2 shows a method of accelerating the drying speed by adding heating and circulating the air inside the dryer body to the method of FIG. That is, in FIG. 2, (11) is a circulating fan for circulating the air in the dryer body, (12) is a heater for heating the circulating air (20), (13) is a circulating air temperature detecting device, (14) is a steam flow control valve. (15) and (16) are supply and exhaust dampers for circulating air, respectively.
【００１１】なお、加熱した空気の供給量、温度、湿度
は中空繊維の種類、長さ、繊維本数、所要乾燥時間等か
ら必要に応じて合理的に決定する事ができる。The supply amount, temperature, and humidity of the heated air can be rationally determined as necessary based on the type, length, number of fibers, required drying time and the like of the hollow fibers.
【００１２】[0012]
【実施例３、比較例１】ポリスルホン合成高分子を用い
て作成した中空繊維束の水分の乾燥処理を前述の実施例
の図１で示した方法で実施した。１００wt％ＤＭＡＣに
溶解したポリスルホン原液を水中で紡糸し、内径φ０.
７ｍｍ、外径φ１.３ｍｍの中空繊維とした。更にこの
中空繊維を長さ１.３ｍに切り揃えて２０２５本集束し
た後、濃度３０％のグリセリン水溶液中に浸漬し、グリ
セリン水溶液を充分中空繊維束内に浸透させる。Example 3 and Comparative Example 1 The drying treatment of the water content of the hollow fiber bundle prepared using the polysulfone synthetic polymer was carried out by the method shown in FIG. A polysulfone stock solution dissolved in 100 wt% DMAC is spun in water, and the inner diameter φ
It was a hollow fiber having a diameter of 7 mm and an outer diameter of 1.3 mm. The hollow fibers are cut to a length of 1.3 m, bundled into 2025 pieces, and then immersed in a 30% glycerin aqueous solution to sufficiently penetrate the hollow fiber bundle into the hollow fiber bundle.
【００１３】この時中空繊維束に含まれる水の含水率は
９８％であった。含水率は、１００×水重量／（ポリス
ルホン重量＋グリセリン重量）で定義される。図３は、
この水とグリセリンを含む中空繊維束から水分を蒸発乾
燥させるときにおいて、本発明の方法で乾燥した場合と
従来の恒温槽内に単に静置する乾燥方法による場合と
の、乾燥が完結するまでの中空繊維束内の含水率の経時
変化を比較した結果である。At this time, the water content of the hollow fiber bundle was 98%. The water content is defined as 100 × water weight / (polysulfone weight + glycerin weight). FIG.
When evaporating and drying the water from the hollow fiber bundle containing water and glycerin, the case where the drying is performed by the method of the present invention and the case where the conventional drying method in which the water is simply left still in a constant-temperature bath are used until the drying is completed. It is the result of having compared the time-dependent change of the water content in a hollow fiber bundle.
【００１４】すなわち本発明による乾燥処理は、摂氏９
０度に加熱した空気を中空繊維束の片側端部から中空繊
維束内に０．３ｍ3 ／分（単糸内平均通気速度０．８ｍ
／秒）供給し、中空繊維束の反対側の端部から出てくる
蒸発水分を含んだ空気は系外に排出させて行っている。
一方、比較例１の従来の、恒温槽内に静置する乾燥処理
は、恒温槽内に多孔板で製作した棚を設置し、その上に
中空繊維束を横置きに静置して摂氏９０度に加熱した空
気を循環させて行った。この従来の乾燥方法で乾燥を完
結させるには４５時間を要するが、本発明による乾燥方
法では４時間で乾燥を完結させる事ができる。That is, the drying treatment according to the present invention is performed at a temperature of 9 degrees Celsius.
Air heated to 0 ° is introduced into the hollow fiber bundle from one end of the hollow fiber bundle into the hollow fiber bundle at a rate of 0.3 m 3 / min (average air flow rate within a single yarn of 0.8 m).
/ Sec), and the air containing evaporated water coming out from the opposite end of the hollow fiber bundle is discharged outside the system.
On the other hand, in the conventional drying treatment of Comparative Example 1, the shelf made of a perforated plate was placed in a thermostat, and the hollow fiber bundle was placed horizontally on the shelf to stand at 90 ° C. The heating was performed by circulating heated air. It takes 45 hours to complete the drying by the conventional drying method, but in the drying method according to the present invention, the drying can be completed in 4 hours.
【００１５】[0015]
【発明の効果】本発明の乾燥方法により、短時間で乾燥
が可能となり、多量の繊維束の乾燥処理を効率良く行う
事ができる。According to the drying method of the present invention, drying can be performed in a short time, and a large amount of fiber bundles can be efficiently dried.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明による中空繊維束の乾燥方法の例を示し
た概略図である。FIG. 1 is a schematic view showing an example of a method for drying a hollow fiber bundle according to the present invention.
【図２】本発明による中空繊維束の乾燥方法の例を示し
た概略図である。FIG. 2 is a schematic view showing an example of a method for drying a hollow fiber bundle according to the present invention.
【図３】本発明と従来技術の乾燥方法による中空繊維束
内の含水率の経時変化を比較した結果である。FIG. 3 shows the results of comparing the change over time in the water content in the hollow fiber bundle by the drying method of the present invention and the conventional drying method.
１ 乾燥機本体 ２ 中空繊維の束 ３ 封止材 ４ 通風筒 ５ 吸気フイルター ６ 吸気ファン ７ ヒーター ８ 温度検出装置 ９ スチーム流量制御バルブ １０ 排気温度検出装置（乾燥終了モニター） １１ 循環ファン １２ ヒーター １３ 温度検出装置 １４ スチーム流量制御バルブ １５ 循環空気給気ダンパー １６ 循環空気排気ダンパー DESCRIPTION OF SYMBOLS 1 Dryer main body 2 Bundle of hollow fibers 3 Sealing material 4 Ventilation tube 5 Intake filter 6 Intake fan 7 Heater 8 Temperature detection device 9 Steam flow control valve 10 Exhaust temperature detection device (drying completion monitor) 11 Circulation fan 12 Heater 13 Temperature Detector 14 Steam flow control valve 15 Circulating air supply damper 16 Circulating air exhaust damper
Claims (2)
空繊維束の端部から、乾燥用空気を中空繊維内部へ強制
的に通気する、中空繊維束の乾燥方法であって、中空繊
維束が中空繊維束端部へ乾燥用ガスを導く通気筒内に挿
入され、かつ、少なくとも中空繊維束の端部外周と該通
気筒との間隙部が封止された状態であることを特徴とす
る中空繊維束の乾燥方法。To 1. A hollow fiber bundle during production, the ends of the hollow fiber bundle is trimmed, the drying air is forcibly vented to the hollow fiber interior, a method of drying the hollow fiber bundle, the hollow fiber
The bundle is inserted into a ventilation tube that guides the drying gas to the end of the hollow fiber bundle.
And at least the outer periphery of the end of the hollow fiber bundle
It is characterized in that the gap with the cylinder is sealed.
The drying method of the hollow fiber bundle that.
筒と、通気筒へ乾燥用ガスを送るファンと、乾燥用ガス
の供給温度検出装置および中空繊維束の他端から排気さ
れるガスの温度検出装置とを有する中空繊維束の乾燥装
置。2. A ventilation tube for introducing a drying gas to the end of the hollow fiber bundle, a fan for sending the drying gas to the ventilation tube, a drying gas supply temperature detecting device, and exhaust from the other end of the hollow fiber bundle. An apparatus for drying a hollow fiber bundle having a gas temperature detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02535892A JP3219445B2 (en) | 1992-02-12 | 1992-02-12 | Drying method for hollow fiber bundles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02535892A JP3219445B2 (en) | 1992-02-12 | 1992-02-12 | Drying method for hollow fiber bundles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0610208A JPH0610208A (en) | 1994-01-18 |
| JP3219445B2 true JP3219445B2 (en) | 2001-10-15 |
Family
ID=12163624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02535892A Expired - Fee Related JP3219445B2 (en) | 1992-02-12 | 1992-02-12 | Drying method for hollow fiber bundles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3219445B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6485888B1 (en) | 1999-07-28 | 2002-11-26 | Tdk Corporation | Fluorinated alcohol for manufacturing optical recording medium and optical recording medium using the same |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3580314B1 (en) | 2003-12-09 | 2004-10-20 | 東洋紡績株式会社 | Polysulfone-based selectively permeable hollow fiber membrane bundle and method for producing the same |
| JP5138572B2 (en) * | 2008-12-25 | 2013-02-06 | 三菱レイヨン株式会社 | Hollow fiber membrane manufacturing method and hollow fiber membrane drying apparatus |
| EP2591847A4 (en) | 2010-07-07 | 2013-11-27 | Mitsubishi Rayon Co | Drying device and drying method for hollow fiber membranes |
| JP5772275B2 (en) * | 2011-06-21 | 2015-09-02 | Nok株式会社 | Method for producing hollow fiber carbon membrane |
| DE102012003466B3 (en) * | 2012-02-16 | 2013-08-14 | Norbert Lohrmann | Device for drying dialyzer, has temperature sensor arranged in region of drying chamber and controlling thermal radiation of heating surface in coordination with low pressure depending on room temperature in drying chamber |
| DE102013203082B4 (en) * | 2013-02-25 | 2014-10-09 | Alpha Plan Gmbh | Testing and drying device for functional testing of dialyzers |
-
1992
- 1992-02-12 JP JP02535892A patent/JP3219445B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6485888B1 (en) | 1999-07-28 | 2002-11-26 | Tdk Corporation | Fluorinated alcohol for manufacturing optical recording medium and optical recording medium using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0610208A (en) | 1994-01-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5673809B2 (en) | Hollow porous membrane production apparatus and hollow porous membrane production method | |
| CN104271651B (en) | The manufacture method of multiple aperture plasma membrane and the drying device of multiple aperture plasma membrane | |
| JP3219445B2 (en) | Drying method for hollow fiber bundles | |
| JP2005220202A (en) | Method for producing porous membrane and the resultant porous membrane | |
| JP5138572B2 (en) | Hollow fiber membrane manufacturing method and hollow fiber membrane drying apparatus | |
| JP2002253938A (en) | Method for manufacturing hollow fiber membrane | |
| JP3043093B2 (en) | Separation membrane treatment method | |
| JPH0512013B2 (en) | ||
| JPS6159764B2 (en) | ||
| JP4803697B2 (en) | Method for producing porous membrane | |
| US4291470A (en) | Method for preshrinking semipermeable membranes | |
| JPS6242705A (en) | Permselective hollow yarn and fluid separator | |
| JP2001038170A (en) | Hollow fiber membrane | |
| JPS6054402B2 (en) | Manufacturing method of recycled cellulose hollow fiber | |
| JP2005087945A (en) | Method for producing hollow fiber membrane | |
| JPS61408A (en) | Hollow yarn composite membrane | |
| JPS61120602A (en) | Hydrophilic heat resistant porous polyolefin hollow yarn | |
| JPS61125409A (en) | Method for making porous polyolefin hollow yarn hydrophilic | |
| JPH10174850A (en) | Treatment of hollow-fiber membrane | |
| JPS60193504A (en) | Hollow fiber membrane for dialysis | |
| KR100231262B1 (en) | The process for producing hollow fiber membrane having an improved rewettability | |
| JP2004305997A (en) | Drying method for hollow fiber membrane bundle, and hollow fiber membrane bundle | |
| JPH01184001A (en) | Porous membrane of polysulfone | |
| JPS62237904A (en) | Porous, hollow yarn membrane | |
| JPH0654995A (en) | Drier |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20010403 |
|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20010731 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090810 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090810 Year of fee payment: 8 |
|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090810 Year of fee payment: 8 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100810 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110810 Year of fee payment: 10 |
|
| LAPS | Cancellation because of no payment of annual fees |