EP0019383A1 - Procédé de filage - Google Patents
Procédé de filage Download PDFInfo
- Publication number
- EP0019383A1 EP0019383A1 EP80301366A EP80301366A EP0019383A1 EP 0019383 A1 EP0019383 A1 EP 0019383A1 EP 80301366 A EP80301366 A EP 80301366A EP 80301366 A EP80301366 A EP 80301366A EP 0019383 A1 EP0019383 A1 EP 0019383A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- air
- stream
- fibres
- cup
- cold
- 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.)
- Granted
Links
Images
Classifications
-
- 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
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/04—Dry spinning methods
-
- 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
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/12—Stretch-spinning methods
- D01D5/14—Stretch-spinning methods with flowing liquid or gaseous stretching media, e.g. solution-blowing
-
- 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
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/18—Formation of filaments, threads, or the like by means of rotating spinnerets
-
- 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
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
- D01F6/76—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from other polycondensation products
Definitions
- This invention relates to a spinning process and in particular to a process of producing fibres by centrifugal spining from a solution containing a thermosetting aldehyde resin such as an amino- and/or phenol- aldehyde resin, particularly a urea- formaldehyde resin.
- a thermosetting aldehyde resin such as an amino- and/or phenol- aldehyde resin, particularly a urea- formaldehyde resin.
- the downward stream of cold humid air into and around the cup provides an environment around the cup of cold humid conditions within which the fibres spun from the cup are attenuated prior to contact with the hot dry air.
- the resin is spun through a series of perforations in the wall of the cup or from the rim thereof, entrained in a stream of the cold humid air thrown out of the cup by the rotation thereof.
- the resin flow rate is such that the perforations are not completely filled with the resin so that some of the cold humid air flows through the perforations with the resin.
- this stream of cold humid air thrown out of the cup may provide the cold, humid, environment for attenuation of the fibres, thus obviating the need for a downwardly directed cold humid air stream around the outside of the cup.
- the spun fibres are thus attenuated while entrained in the cold humid air stream emanating from the perforations of the cup.
- the attenuation is partly effected by the entraining air stream and partly by inertia effects, prior to contact with the hot dry air stream.
- the outwardly directed air stream having the fibres entrained therein emanating from the cup often gives rise to a torroidal vortex of cold humid air of somewhat greater diameter than the spinning cup and located in a plane just above the spinning plane ie the plane of the fibres as they are spun from the cup.
- the fibres may be caught up by this vortex and become entangled and/or thrown up on to the underside of the top of the enclosure in which the spinning operation is conducted where, because the fibres are still only partially dried and hence are of a somewhat adhesive nature, they adhere and so are not transported to the collection zone. Eventually such adhering fibres interfere with the satisfactory spinning of the rest of the resin.
- the thermosetting resin is preferably a condensate of an amino compound with an aldehyde such as formaldehyde. Some or all of the formaldehyde may be replaced by a higher aldehyde such as acetaldehyde.
- the amino compound is preferably a polyamine, particularly urea and/or melamine. In order that the resin is water soluble, so that water can be used as the solvent, the amino compound is preferably urea, alone or in admixture with up to 5% by weight.of melamine. Some or all of the amino compound may be replaced by a phenol such as phenol, cresol or resorcinol.
- the molar ratio of aldehyde to phenol and/or amino groups is between 0.6:1 and 1.5:1, preferably between 0.7:1 and 1.3:1.
- the curing catalyst which is preferably added to the resin solution just before the latter is fed to the spinning cup, may be a weak catalyst such as di(ammonium) hydrogen phosphate or ammonium formate, a moderate catalyst such as formic acid, ammonium sulphate, ammonium chloride or ammonium dihydroge- phosphate, or a strong catalyst such as phosphoric, sulphuric, sulphamic or hydrochloric acid.
- the amount of catalyst will generally be within the range 0.05 to 1% by weight of the resin solids.
- an adhesion modifier include certain inorganic oxyacid radicals which react with aldehydes.
- suitable radicals include sulphite, phosphite, and borate radicals.
- adhesion modifiers such radicals are incorporated into the resin during the condensation of-the amino or phenol compound with the aldehyde.
- adhesion modifiers such as carbohydrates, particularly formose, may be incorporated into the resin solution before, during, or after condensation of the amino or phenol compound with the aldehyde.
- the incorporation of modifiers is further described in our German OLS Specifications 2754525 and 2819461.
- the solvent used to make the solution is preferably water, but alternatively may be any solvent which is relatively volatile at the temperatures to which the spun fibres are heated by the hot dry air stream.
- thermoplastic polymer that is soluble in the solvent employed.
- suitable water soluble polymers include polyvinyl alcohol and poly ethylene oxide.
- the amount of thermoplastic polymer used is preferably 0.01 to 5% by weight of the thermosetting resin solids. While the thermoplastic polymer may be incorporated before or during condensation of the amino and/or phenol compound with the aldehyde, it is conveniently added with the curing catalyst.
- the resin solution, to which the curing catalyst has been added, is fed to a spinning cup.
- the cup which is mounted for rotation about a substantially vertical axis, is a hollow vessel having one cr L .ore spinning surfaces.
- the cup may be open-ended and the spinning surface comprises the end of the open wall thereof.
- the cup wall may be provided with a plurality of spinning surfaces in the form of perforations.
- the size and number of perforations will be determined by the cup diameter and rotational speed: however typically for a 12 cm diameter cup rotating at 5000 to 10,000 rpm, 24 perforations of 3 mm width are suitable.
- the perforations are preferably rectangular in configuration and the resin solution feed rate and cup rotational speed are preferably adjusted so that the resin solution is spun from part of the perimeter of the perforations.
- the spinning solution preferably has a viscosity between 5 and 100 poise at room temperature as measured by British Standard 1733 using cup B6.
- the viscosity may be adjusted by concentration or dilution of the solution as necessary.
- cold, humid, air is supplied to the interior of the cup from whence it is pumped, by rotation of the cup, along with the resin solution.
- air from the external surroundings of the spinning apparatus may be employed, eg ambient air having a temperature below 30°C and a relative humidity in excess of 50% is suitable.
- the temperature and humidity of the cold, humid air may be modified as necessary to provide satisfactory spinning but generally the air temperature should be below 40 0 C and the air should have a relative humidity above 4096. It will be appreciated that as the air temperature is reduced, the relative humidity need not be so high in order to retard drying of the spun fibres.
- the fibres are entrained in the stream of cold humid air as they are spun from the spinning cup. While so entrained in the cold humid environment the fibres are attenuated, partly by inertia and partly by the effect of the cold humid air stream.
- the fibres are preferably drawn out to a mean diameter of the order of 1 to 50 ⁇ m, particularly below 30 pm. To permit such attenuation it is necessary for the fibres to remain entrained in the cold, humid, air stream for some distance from the spinning cup. Generally they should be so entrained until they have reached a distance of at least the diameter of the spinning cup from the axis of the cup.
- the extent to which the fibres are attenuated depends on a number of factors, including the extent to which they remain entrained in a cold humid environment, as indicated above.
- the stream of hot, dry, air will eventually mix with the cold humid air and dry the fibres thereby prewenting further attenuation.
- the extent of attenuation will therefore also depend on the relative velocities, positioning, temperature and humidity of the air streams.
- the stream of cold, humid air emanating from the spinning cup is deflected downwards: it should be deflected downwards to such an extent that any torroidal vortex between the streams of hot dry air and cold, humid air is eliminated to such an extent that the fibres entrained in the cold, humid air stream are not caught up in such a vortex.
- the cold, humid, air stream may be deflected downwards by the downwardly directed hot air stream. Increasing the flow rate of the hot, dry, air stream will reduce or eliminate completely such a vortex but at the same time will reduce the extent of attenuation of the fibres.
- the process is conveniently set up by fixing the temperature, humidity and flow rate of the cold, humid air stream(s), the resin feed rate, and the rotational speed of the cup, and then adjusting the flow rate and temperature of the hot dry air to eliminate vortex formation and to give fibres having the desired degree of attenuation.
- the temperature and rate of flow of the hot, dry, air stream must be sufficient to dry the attenuated fibres to render them non-sticky.
- the temperature of the hot, dry, air is preferably in the range 80 to 270°C, particularly 100 to 220°C.
- the relative humidity of the hot air is preferably below 50 0 %.
- the hot, dry, air may simply be ambient air heated to the desired temperature without any drying step.
- a vortex is formed below the spinning cup. While it is not necessary to eliminate such a vortex, its removal may be desirable in some cases. It may be eliminated by the provision of an outwardly directed stream of air from below the cup and/or by the provision of a suitably shaped housing below the spinning cup to give streamlined flow of the air streams thereover.
- the stream of hot, dry, air serves to dry the fibres and to transport them to the collection zone.
- the nature and amount of the catalyst, together with the spinning and post spinning heat treatment conditions will determine the degree of cure for any given resin.
- the degree of cure may conveniently be assessed by determining the proportion of fibre dissolved in water under specified conditions.
- a suitable procedure is as follows:
- Fibres produced by the process of the invention are of particular utility in paper manufacture either as the sole fibrous constituent or in admixture with cellulosic fibres, eg conventional mechanical or chemical pulp, or other synthetic fibrous materials, eg polyolefin fibres.
- FIG. 1 is a vertical section through the apparatus of a first embodiment and Figure 2 is a vertical section through part of the apparatus of a second embodiment.
- the spinning apparatus has an outer casing 1 on the top 2 of which is mounted a motor 3 driving a shaft 4 carrying a spinning cup 5.
- the cup 5 has a vertical side wall 6 in which there is provided a plurality of rectangular perforations 7.
- Resin solution, in admixture with a solution of a curing catalyst, and optionally a soluble thermplastic polymer, is fed to the cup 5 via a feed pipe 8.
- Cold, humid, air is fed to the cup via an air feed pipe 9.
- the resin solution is spun from the lower edge of the perforations 7 as fibres 10 entrained in an outwardly directed stream 11 of cold, humid, air pumped from the supply 9 throngh the perforations 7 by rotation of the cup 5.
- a shroud 12 surrounding the drive shaft 4 and feed pipes 8, 9.
- a small gap 13 is left between the bottom of shroud 12 and the top of cup 5. Rotation of cup 5 also causes an outwardly directed stream 14 of the cold, humid, air to issue from gap 13.
- Hot, dry, air is pumped to a plenum chamber 15 on the top 2 of the apparatus from whence it flows as a downwardly directed stream 16 through an annular orifice 17.
- This stream 16 of hot, dry, air is deflected outwardly by the stream 14 of cold, humid, air issuing from gap 13 and impinges on the stream 11 of cold, humid, and issuing from the perforation 7 of the cup, deflecting the stream 11 downwards thereby eliminating the torroidal vortex 18 (shown dotted) which would form in the absence of the downwardly directed stream 16 of air.
- the shroud 12 may, if desired, be provided with vanes (not shown) to deflect the hot, dry, air stream outwardly thus augmenting the radial deflection given by stream 14.
- the stream of hot, dry, air 16 eventually mixes with the stream of cold, humid, air 11, dries the fibres 10, and transports them to a conveyor (not shown) at the bottom of the spinning apparatus.
- Beneath cup 5 there is provided a housing 19 which serves to streamline the air flow.
- a hole 20 is provided in housing 19 beneath cup 5.
- the rotating cup 5 acts as an air pump drawing air in through hole 20 and expelling it radially as a stream 21. This air stream prevents the formation of a vortex below the spinning cup 5.
- the spinning cup 22 comprises a hollow vessel divided into upper and lower portions by an integral plate 23 having a plurality of perforations 24 therein.
- the cup is driven by a shaft 25.
- a resin feed supply tube 26 extends through the open upper end of cup 22 and supplies the resin on to plate 23 from whence it passes, throngh perforations 24, on to the interior wall 27 .of the lower portion of cup 22.
- the resin flows down wall 27 and is spun as fibres 28, by centrifugal force, from the lower edge of wall 27.
- Cup 22 is mounted for rotation within an enclosure, not shown, carrying a stationary shroud 29 surrounding the drive shaft 25 and the resin supply tube 26.
- Cold, humid, air is pumped down the interior of shroud 29.
- Some of the cold, humid, air flows into the upper portion of cup 22, through perforations 24 and out of the bottom of the cup as an outwardly directed air stream 30 having the fibres 28 entrained therein.
- a deflector ring 31 mounted under and rotatable with plate 23 is provided to limit the flow of cold, humid, air and to direct it outwardly to entrain fibres 28.
- a downwardly directed stream 35 of hot, dry, air is deflected outwardly by the air stream 32 so that it does not meet the cold air stream 30 flowing out of the bottom of cup 22 with the fibres 28 entrained therein until the fibres have been attenuated to the desired degree.
- cold air stream 32 has a downward, as well as outward, component it also serves to deflect the cold air stream 30 flowing out of the bottom of cup 22 downwards thus eliminating vortex formation.
- a housing 36 is provided to smooth the air flows below the cup 22.
- This housing 36 is provided with an aperture 37 from which air is drawn, and thrown outwardly by the pumping action of the rotation of cup 22, as an air stream 38.
- the invention is further illustrated by the following example.
- aqueous solution of a urea/formaldehyde resin having a urea:forma1dehyde ratio of 1:2 and a solids content of 65% by weight was mixed with 16 ml, per 100g of the resin solution, of an aqueous solution containing 2.596 by weight of a polyethylene oxide of mean molecular weight 600,000 and 0.44% by weight of ammonium sulphate as curing catalyst.
- the resultant solution which had a viscosity of about 20 poise at room temperature, was spun into fibres using apparatus of the type shown in Figure 1 but in which housing 19 was omitted.
- the solution was fed at 20°C at a rate of 80 ml/min (approx 75g of resin per minute) to the spinning cup which had a diameter of 12 cm and 24 rectangular perforations of 3 mm width and 5 mm height in its sidewall.
- the rotational speed of the cup was 7000 rpm.
- Air at 30°C and 70% relative humidity was fed to the cup at a rate of approximately 63 m 3 /hour.
- Dry air at 170°C (obtained by heating ambient air to 170 0 C without any drying step) was fed to the plenum chamber at 185 m 3 /hr from whence it flowed via an annular gap of 20 cm outside diameter and 4 cm width, into the spraying chamber which had a diameter of 1.2 m.
- the resultant stream of hot, dry, air deflected the stream of cold, humid, air emanating from the spinning cup perforations and from the gas between the shroud and the top of the cup, downwards and carried the fibres, while drying them, to the collection zone.
- the resultant fibres had an average diameter of about 8 ⁇ m.
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)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT80301366T ATE1250T1 (de) | 1979-05-15 | 1980-04-25 | Spinnverfahren. |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB7916863 | 1979-05-15 | ||
GB7916863 | 1979-05-15 | ||
GB8005838 | 1980-02-21 | ||
GB8005838 | 1980-02-21 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0019383A1 true EP0019383A1 (fr) | 1980-11-26 |
EP0019383B1 EP0019383B1 (fr) | 1982-06-23 |
Family
ID=26271530
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP80301366A Expired EP0019383B1 (fr) | 1979-05-15 | 1980-04-25 | Procédé de filage |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0019383B1 (fr) |
AU (1) | AU528448B2 (fr) |
CA (1) | CA1136366A (fr) |
DE (1) | DE3060576D1 (fr) |
FI (1) | FI65094C (fr) |
NO (1) | NO149357C (fr) |
NZ (1) | NZ193641A (fr) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3105784A1 (de) * | 1981-02-16 | 1982-09-02 | Petro Fiber Oljesanering AB, 21156 Malmö | Spinnverfahren zur herstellung von thermoplastfasern und vorrichtung zur durchfuehrung des verfahrens |
US4472229A (en) * | 1980-07-29 | 1984-09-18 | Imperial Chemical Industries Limited | Method of making a laminated sheet product |
FR2543169A1 (fr) * | 1983-03-23 | 1984-09-28 | Saint Gobain Isover | Procede de production de fibres phenoplastes |
EP0325116A2 (fr) * | 1988-01-16 | 1989-07-26 | Bayer Ag | Procédé de fabrication de fibres très fines de polymères |
EP0624665A2 (fr) * | 1993-05-11 | 1994-11-17 | BASF Aktiengesellschaft | Procédé et dispositif pour la production de fibres selon un procédé de filage par centrifugation |
DE102005048939A1 (de) * | 2005-07-01 | 2007-01-11 | Carl Freudenberg Kg | Vorrichtung, Anordnung und Verfahren zur Herstellung von Fasern und eine solche Fasern umfassende Anordnung |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1357206A (en) * | 1920-02-10 | 1920-10-26 | Fuller Allen Reed | Method of making fibers |
US2336743A (en) * | 1941-10-13 | 1943-12-14 | Fred W Manning | Method and apparatus for spinning unwoven fabrics |
DE2810535A1 (de) * | 1977-03-11 | 1978-09-14 | Ici Ltd | Verfahren zum zentrifugenspinnen von fasern aus einem fluessigen formaldehydharz |
GB2001578A (en) * | 1977-07-29 | 1979-02-07 | Ici Ltd | Spinning fibres |
-
1980
- 1980-04-25 EP EP80301366A patent/EP0019383B1/fr not_active Expired
- 1980-04-25 DE DE8080301366T patent/DE3060576D1/de not_active Expired
- 1980-05-07 NZ NZ193641A patent/NZ193641A/xx unknown
- 1980-05-08 AU AU58225/80A patent/AU528448B2/en not_active Ceased
- 1980-05-09 CA CA000351780A patent/CA1136366A/fr not_active Expired
- 1980-05-13 NO NO801417A patent/NO149357C/no unknown
- 1980-05-14 FI FI801565A patent/FI65094C/fi not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1357206A (en) * | 1920-02-10 | 1920-10-26 | Fuller Allen Reed | Method of making fibers |
US2336743A (en) * | 1941-10-13 | 1943-12-14 | Fred W Manning | Method and apparatus for spinning unwoven fabrics |
DE2810535A1 (de) * | 1977-03-11 | 1978-09-14 | Ici Ltd | Verfahren zum zentrifugenspinnen von fasern aus einem fluessigen formaldehydharz |
GB2001578A (en) * | 1977-07-29 | 1979-02-07 | Ici Ltd | Spinning fibres |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4472229A (en) * | 1980-07-29 | 1984-09-18 | Imperial Chemical Industries Limited | Method of making a laminated sheet product |
DE3105784A1 (de) * | 1981-02-16 | 1982-09-02 | Petro Fiber Oljesanering AB, 21156 Malmö | Spinnverfahren zur herstellung von thermoplastfasern und vorrichtung zur durchfuehrung des verfahrens |
FR2543169A1 (fr) * | 1983-03-23 | 1984-09-28 | Saint Gobain Isover | Procede de production de fibres phenoplastes |
EP0122836A1 (fr) * | 1983-03-23 | 1984-10-24 | Isover Saint-Gobain | Procédé de production de fibres phénoplastes |
EP0325116A2 (fr) * | 1988-01-16 | 1989-07-26 | Bayer Ag | Procédé de fabrication de fibres très fines de polymères |
EP0325116A3 (en) * | 1988-01-16 | 1989-12-06 | Bayer Ag | Process for the preparation of ultra-fine polymer fibres |
EP0624665A2 (fr) * | 1993-05-11 | 1994-11-17 | BASF Aktiengesellschaft | Procédé et dispositif pour la production de fibres selon un procédé de filage par centrifugation |
EP0624665A3 (fr) * | 1993-05-11 | 1995-05-17 | Basf Ag | Procédé et dispositif pour la production de fibres selon un procédé de filage par centrifugation. |
US5494616A (en) * | 1993-05-11 | 1996-02-27 | Basf Aktiengesellschaft | Production of fibers by centrifugal spinning |
DE102005048939A1 (de) * | 2005-07-01 | 2007-01-11 | Carl Freudenberg Kg | Vorrichtung, Anordnung und Verfahren zur Herstellung von Fasern und eine solche Fasern umfassende Anordnung |
Also Published As
Publication number | Publication date |
---|---|
NO801417L (no) | 1980-11-17 |
AU528448B2 (en) | 1983-04-28 |
FI65094B (fi) | 1983-11-30 |
CA1136366A (fr) | 1982-11-30 |
FI65094C (fi) | 1984-03-12 |
DE3060576D1 (en) | 1982-08-12 |
NO149357C (no) | 1984-04-04 |
AU5822580A (en) | 1980-11-20 |
FI801565A (fi) | 1980-11-16 |
NZ193641A (en) | 1983-03-15 |
NO149357B (no) | 1983-12-27 |
EP0019383B1 (fr) | 1982-06-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4323524A (en) | Production of fibres | |
US4178336A (en) | Production of fibres | |
EP0019383B1 (fr) | Procédé de filage | |
US4277436A (en) | Method for forming filaments | |
US4021410A (en) | Melt-spun drawn or undrawn flame-resistant and antifusing cured epoxy-modified novolak filaments and process for production thereof | |
KR100289250B1 (ko) | 원심식 방사 공정에 의한 섬유의 제조방법 | |
WO1998034885A1 (fr) | Liant d' uree-formaldehyde pour fabriquer des mats de fibres | |
FI56366C (fi) | Saett att framstaella glasfiberprodukt | |
US4294783A (en) | Spinning process and apparatus | |
US5055241A (en) | Process for the production of phenoplast fibers | |
CN109137139A (zh) | 一种木质素基纤维的制备方法 | |
US4172057A (en) | Amino-resin compositions | |
CA2216872C (fr) | Procede de fabrication de filaments a partir de produits de condensation de melamine/formaldehyde | |
CN1147626C (zh) | 一种阻燃纤维及其制造方法 | |
WO1997022739A1 (fr) | Procede a flux laminaire de production de fibres de diacetate de cellulose | |
US20110136947A1 (en) | Method of spray drying phenol-formaldehyde resin | |
CA1118974A (fr) | Fabrication de fibres de resine de formaldehyde | |
US5916999A (en) | Process for producing filaments from melamine/formaldehyde condensation products | |
EP0053441B1 (fr) | Objets moulés à partir de résines d'aminoformaldéhyde | |
CN219252912U (zh) | 一种精细化工原料生产用高效离心机 | |
CA1178757A (fr) | Fibrilles de polyoxymethylene; methode de preparation et applications | |
CN218653003U (zh) | 一种宁南霉素原药烘干用除湿装置 | |
CA1161593A (fr) | Materiau resineux | |
CN106245450A (zh) | 一种千屈菜增强型空气过滤纸的制备方法 | |
JPH0625993A (ja) | 熱硬化性複合材料及びその製造方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed | ||
AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB IT NL SE |
|
ITF | It: translation for a ep patent filed |
Owner name: ING. C. GREGORJ S.P.A. |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB IT NL SE |
|
REF | Corresponds to: |
Ref document number: 1250 Country of ref document: AT Date of ref document: 19820715 Kind code of ref document: T |
|
REF | Corresponds to: |
Ref document number: 3060576 Country of ref document: DE Date of ref document: 19820812 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 19840315 Year of fee payment: 5 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19840319 Year of fee payment: 5 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 19840322 Year of fee payment: 5 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 19840331 Year of fee payment: 5 Ref country code: BE Payment date: 19840331 Year of fee payment: 5 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 19860310 Year of fee payment: 7 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 19860430 Year of fee payment: 7 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Effective date: 19870425 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19870429 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Effective date: 19870430 Ref country code: CH Effective date: 19870430 |
|
BERE | Be: lapsed |
Owner name: IMPERIAL CHEMICAL INDUSTRIES P.L.C. Effective date: 19870430 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Effective date: 19871101 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19871230 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Effective date: 19880101 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Effective date: 19880425 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Effective date: 19890430 |
|
EUG | Se: european patent has lapsed |
Ref document number: 80301366.3 Effective date: 19880906 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |