US3883630A - Process for the recovery of synthetic fibrils - Google Patents

Process for the recovery of synthetic fibrils Download PDF

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Publication number
US3883630A
US3883630A US286683A US28668372A US3883630A US 3883630 A US3883630 A US 3883630A US 286683 A US286683 A US 286683A US 28668372 A US28668372 A US 28668372A US 3883630 A US3883630 A US 3883630A
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Prior art keywords
vessel
fibrils
vapors
process according
organic solvent
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Expired - Lifetime
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US286683A
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English (en)
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Carlo Raganato
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Solvay SA
Hercules LLC
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Solvay SA
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Assigned to HERCULES INCORPORATED, A CORP. OF DE. reassignment HERCULES INCORPORATED, A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SOLVAY & CIE., S.A.
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
    • D04H1/724—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged forming webs during fibre formation, e.g. flash-spinning
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J11/00—Recovery or working-up of waste materials
    • C08J11/02—Recovery or working-up of waste materials of solvents, plasticisers or unreacted monomers
    • 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
    • D01D5/11—Flash-spinning
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H13/00—Other non-woven fabrics

Definitions

  • ABSTRACT [58] Field of Search 162/102, 203, 211, 217, A process for recovering Synthetic polymer fibrils 203 205 204 764"); 75 which are In the presence of vapors of an orgamc solvent, by depositing the fibrils on a moving porous support in a closed vessel and continuously extracting the [56] References cued solvent vapors from the vessel by suction,
  • the present invention relates to a process for the recovery of synthetic polymer fibrils which are in the presence of vapors of an organic solvent, and also to an apparatus which is particularly suitable for carrying out this process.
  • discontinuous fibrils are produced by abrupt expansion through an aperture of a two-phase liquid mixture of molten polymer and solvent which is at elevated temperature and pressure, so as to bring about the instantaneous vaporization of the solvent and to solidify the polymer when an additive fluid is introduced into the aforesaid twophase liquid mixture before expansion is complete.
  • the additive fluid may be identical to the solvent used to form the two-phase liquid mixture.
  • discontinuous fibrils are also produced by effecting the abrupt expansion of a twophase liquid mixture of molten polymer and solvent which is at elevated temperature and pressure so as to effect the instantaneous vaporization of the solvent and to form a continuous fibrillate structure, and shredding the continuous fibrillate structure thus produced, at the moment of its formation, by a transverse current of fluid.
  • the fluid constituting the transverse current may be identical with the solvent used to form the two-phase liquid mixture.
  • the production of discontinuous fibrils by this last technique also leads to the release of large volumes of solvent vapors.
  • the fibrils produced must be recovered in an easily handled form, for example in the form of a continuous sheet possessing a certain internal cohesion and capable of being subsequently treated by known conventional techniques for the production of non-woven textiles of synthetic papers.
  • the invention involves a process for the recovery of synthetic polymer fibrils which are in the presence of vapors of an organic solvent, by depositing the fibrils in the form ofa sheet on a movable porous support which permits practically complete recovery of the solvent vapors.
  • the recovery of fibrils which are in the presence of organic solvent vapors is effected in a closed vessel containing vapors ofa liquid which is not miscible with the organic solvent and which is inert in relation to the polymer of which the fibrils are composed, the solvent vapors being continuously extracted from this vessel by suction.
  • fibrils as used herein includes Continuous or discontinuous fibrillar structures composed of very fine filaments, of the thickness of about l micron, connected together to form a three-dimensional network, the specific surface of these products being greater than 1 m /g.
  • the discontinuous fibrils usually have a length varying from 1 mm to 5 cm.
  • the closed vessel also contains liquid which is not miscible with the organic solvent and which is inert in relation to the polymer of which the fibrils are composed.
  • liquid not miscible with an organic solvent is also intended to include liquids which are slightly miscible with the organic solvent. This term will therefore include any liquid which, on being mixed with the organic solvent, gives rise, after 60 seconds rest, to the formation of two phases separated by an interfacial meniscus, each phase containing respectively at least 95% of one of the constituents of the mixture at 20C.
  • the immiscible liquid must be inert in relation to the polymer of which the fibrils are composed. As a matter of preference it should dissolve less than 20g of polymer per kg of liquid at 20C.
  • the partial pressure of the vapors of liquid which is not miscible with the organic solvent, and which is inert in relation to the polymer of which the fibrils are composed, in the closed vessel is preferably so regulated as to be kept between 5% and particularly between 10% and 50%, of the total pressure prevailing in the vessel.
  • the preferred immiscible liquid is water, particularly because of its low cost and of the special advantages which it provides and which will be explained later. It is however quite obvious that other immiscible liquids may likewise be suitable for carrying out the process according to the present invention.
  • the total pressure prevailing in the latter should be higher than atmo spheric pressure.
  • the increase in pressure in relation to atmospheric pressure may advantageously be between 50 and 506 mm of a column of water.
  • a temperature in the vessel of between 50 and 100C is generally sufficient to avoid the condensation of the vapors of organic solvents usually employed for the production of fibrils.
  • the temperature prevailing in the closed vessel should be lower than the boiling temperature of the liquid which is immiscible with the organic solvent under the pressure conditions prevailing in the closed vessel. This has the result that if, in certain particular cases of production of fibrils, the organic solvent used has a condensation temperature substantially higher than 100C under the conditions of pressure prevailing in the closed vessel, it is preferable for the immiscible liquid used to be a liquid other than water and having a boiling point higher than the condensation point of the organic solvent under the same conditions of pressure.
  • the vapors of organic solvent are continuously extracted from the closed vessel by suction, mixed with vapors of immiscible liquid. They are preferably drawn by suction through the movable porous support of the fibril sheet, because the suction then cooperates in forming the sheet of fibrils and gives it better cohesion.
  • the immiscible liquid vapors extracted from the closed vessel at the same time as the organic solvent vapors do not entail any particular problem, because they can easily be separated from the solvent by condensation and decantation.
  • the sheet of fibrils continuously formed on the movable porous support is continuously extracted from the closed vessel through a device which maintains the tightness of the closed vessel.
  • This device may for example be a sealing system of labyrinth rollers. It is nevertheless preferred to extract the sheet of fibrils from the closed vessel through a sealing device constituted by a hydraulic seal formed by the liquid which is not miscibile with the organic solvent.
  • the process according to the invention may be applied to any process for the production of synthetic polymer fibrils in the presence of organic solvent vapors.
  • polystyrene resin such as polyethylene, polypropylene, copolymers of ethylene and propylene, polyisobutylene, etc.
  • polyamides such as polyethylene, polypropylene, copolymers of ethylene and propylene, polyisobutylene, etc.
  • polyamides such as polyethylene, polypropylene, copolymers of ethylene and propylene, polyisobutylene, etc.
  • polyamides such as polyethylene, polypropylene, copolymers of ethylene and propylene, polyisobutylene, etc.
  • the polyamides such as polyethylene, polypropylene, copolymers of ethylene and propylene, polyisobutylene, etc.
  • the polyamides such as polyethylene, polypropylene, copolymers of ethylene and propylene, polyisobutylene, etc.
  • the polyamides such as polyethylene, polypropylene, copolymers of ethylene and propylene, polyisobutylene
  • organic solvents used with these polymers mention may be made of the aliphatic hydrocarbons, such as pentane, hexane, heptane, octane, and their homologues and isomers.
  • the alicyclic hydrocarbons such as cyclohexane
  • the aromatic hydrocarbons such as benzene. toluene, etc.
  • halogenated solvents such as benzene. toluene, etc.
  • the process according to the invention offers the advantage of permitting total recovery of the organic solvent, while eliminating any danger of accident. Moreover, when the immisicible liquid is water or another polar liquid, the risk of explosion due to the presence of electrostatic charges is eliminated, Finally, the passage of the sheet of fibrils through the hydraulic seal permits the elimination of the last traces of solvent with which the sheet may be impregnated.
  • the invention also involves an apparatus which is particularly suitable for carrying out the process according to the invention.
  • This apparatus has:
  • a a closed vessel containing vapors of a liquid which is immiscible with the organic solvent and inert in relation to the polymer of which the fibrils are composed;
  • a suction box situated under the movable porous support, facing the device for introduction of fibrils and solvent vapors and provided for the purpose of effecting the formation of the sheet of fibrils and the evacuation of the major part of the organic solvent vapors;
  • a sealing device for continuously removing from the closed vessel the sheet of fibrils deposited on the movable porous support
  • the bottom of the closed vessel constitutes a reservoir intended to contain liquid immiscible with the organic solvent and inert in relation to the polymer of which the fibril is composed, in the form of a liquid phase in equilibrium with the vapors of immiscible liquid.
  • the device for introducing fibrils and solvent vapors into the closed vessel may for example be a chimney, a pipe, etc.
  • the immiscible liquid may be introduced into the vessel in any form, for example, in gas, vapor, or liquid form.
  • the movable porous support may be a simple rotat ing drum, provided that the sheet of fibrils deposited on it has sufficient cohesion to be self-supporting when it leaves this drum. This cohesion may optionally be increased by means of a pressing roller acting on the sheet so as to compact it just before it leaves the rotat ing drum.
  • a continuous porous band which accompanies and supports the sheet during its extraction through the sealing device.
  • This porous band may be a microperforated metal sheet, a very fine wire mesh, 21 felt, or a cloth.
  • This band must be as undeforrnablc and as wear-resistant as possible.
  • the material of which it is composed must withstand the organic solvent vapors used. It has in particular been found that cloths made from polyester fibers such as ethylene glycol polyterephthalate fibers or polypropylene fibers, prove to be particularly advantageous because of their chemical inertness and their hydrophobic character.
  • the sealing device may be of any kind provided that it is effective, and it may for example as above mentioned, be composed of a system of labyrinth rollers According to a preferred embodiment, this sealing device is composed of a hydraulic seal formed by the liuid phase of liquid immiscible with the organic solvent which lies at the bottom of the closed vessel, in a reservoir provided for this purpose.
  • the bottom part of this closed vessel may also be provided with heating means for the bottom layer of liquid immiscible with the organic solvent.
  • the apparatus may also be completed by a second continuous band bearing on the sheet of fibrils depos ited on the first porous band during its passage through the hydraulic seal. In this way the sheet of fibrils is sandwiched between the two continuous bands, which oblige it to pass through the sealing device.
  • This modified embodiment is found very useful when the fibrils have a density lower than the density of the liquid constituting the hydraulic seal.
  • the closed vessel is provided with heating and monitoring means so that a thermostat can be used to maintain its walls at the desired temperature, depending on the organic solvent used and with the aim of avoiding condensation of the solvent.
  • FIG. 1 is a diagrammatic view of an apparatus according to the invention.
  • FIG. 2 is an enlarged view of a detail in FIG. 1. showing the formation of the sheet of fibrils and its compac tion.
  • the apparatus is composed of a closed vessel 1, to the top of which is connected a chimney 2 through which the fibrils in the presence of vapors of an organic solvent are introduced into the closed vessel 1.
  • FIG. 1 it can be seen that this mixture of fibrils and solvent vapors is obtained by the abrupt expansion of a polymer solution through nozzle 3. It is however quite obvious that the apparatus described is in no way restricted to this particular form of production of fibrils, and that it could be just as effective for the recovery of fibrils which are in the presence of organic solvent vapors and are obtained by other processes.
  • the continuous band 5 has a constant, controllable speed of linear movement and follows the trajectory imposed on it by the support rollers 6 to 13.
  • the continuous porous band 5 passes into the gap formed by the driving support roller 7 and the compression roller 14, which is adjustable by means of the pneumatic or hydraulic device 15.
  • This second band 16 moves between the support rollers 17 to 21 at a speed equal to that of the porous band 5.
  • the closed vessel is provided with a hydraulic seal 22 composed of a liquid which is immiscible with the organic solvent and inert in relation to the polymer of which the fibrils are composed.
  • the bottom part of the vessel also contains an overflow weir 23 connected to an evacuation pipe 24.
  • the two continuous bands 5 and 16 pass through the hydraulic seal 22, through which these bands leave the closed vessel 1.
  • the path of these bands is imposed by the support rollers 7, 8, 9, and 19.
  • the last two support rollers 9 and 19 are so disposed as to move the continuous bands 5 and 16 away from one another. After their passage out of the vessel, during which they release the sheet of fibrils, these continuous bands enter the closed vessel again, passing once again through the hydraulic seal 22, under the action of the support rollers l1, l2 and 13 in one case of the support l7, l8 and 21 in the other.
  • a drier 25 may optionally be provided to dry the continuous porous band 5 between the rollers 6 and 13 before it passes over the suction box 4.
  • This drier may be suction box provided with a slot over which the continuous band slides, this box being connected toa vacuum source not shown. In this way the vapors drawn in under local conditions of high speed and low pressure effect the elimination of the liquid wetting the band.
  • the continuous band 16 may also pass around the pressing roller 14 and pass through the cap between this roller and the driving roller 7.
  • the level of liquid immiscible with the organic solvent contained in the bottom part of the closed vessel 1 is determined by the overflow 23.
  • Heating means are provided in the bottom of the closed vessel 1, so as to bring the liquid con tained in this vessel to the desired temperature and to keep it at this temperature.
  • the device for be a the immiscible liquid into the closed vessel is composed of a pipe, likewise not shown, which to a supplies immiscible liquid continuously into the closed vessel 1 so as to produce a circulation.
  • the closed vessel 1 is in addition equipped with means, such as a jacket, enabling its walls and consequently its interior to be kept at a predetermined temperature. Finally, during their passage out of the closed vessel 1 the continuous bands and 16 may pass over tensioning, crease-removing or centering rollers 26. In addition, they may be cleaned by rotating brushes or by water sprays.
  • the volumetric flow of hexane is substantially equal to the volumetric flow of the polyethylene solution.
  • This suspension of fibrils is directed through the chimney 2 into the closed vessel 1.
  • This vessel has the external shape ofa cube with a side dimension of about 3 meters.
  • the walls of the closed vessel 1 are thermostatically controlled at a temperature of 90C, and the vessel contains a volume of water of the order of m which is kept at 80C.
  • the continuous supply flow of water is kept at l in per hour.
  • the band which has a width of 2.3 me ters, is made of ethylene glycol polyeterephthalate fibers and has a weight of 1,000 g/m
  • the suction is so controlled that the pressure prevailing at any moment in the closed vessel 1 will be slightly higher than atmospheric pressure.
  • the excess pressure of the order of 300 mm water column, has the effect of preventing any accidental entry of air into the closed vessel 1.
  • the partial pressure of the water vapor in the vessel is 0.255 atmospheres absolute and the partial pressure of hexane vapors is about 0.775 atmospheres absolute.
  • the sheet 28 of compact fibrils is freed by the continuous band 5 and 16.
  • This sheet the weight of which is from about to 1 10 g/m can then be consolidated and converted into a non-woven product of good quality by conventional techniques, such as by calendering.
  • fibrils are produced from a polymer selected from the group comprising the polyolefins, polyamides, polyesters. polyurethanes, polycarbonates, vinyl and acrylic poly mers.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Sustainable Development (AREA)
  • Mechanical Engineering (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Paper (AREA)
  • Nonwoven Fabrics (AREA)
  • Multicomponent Fibers (AREA)
US286683A 1971-09-09 1972-09-06 Process for the recovery of synthetic fibrils Expired - Lifetime US3883630A (en)

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LU63876 1971-09-09

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US (1) US3883630A (nl)
JP (1) JPS5439501B2 (nl)
AR (1) AR197577A1 (nl)
AT (1) AT330941B (nl)
AU (1) AU454391B2 (nl)
BE (1) BE787890A (nl)
BR (1) BR7206179D0 (nl)
CA (1) CA1016314A (nl)
CH (1) CH539131A (nl)
CS (1) CS160064B2 (nl)
DD (1) DD100023A5 (nl)
DE (1) DE2241163C2 (nl)
ES (1) ES405987A1 (nl)
FI (1) FI54151C (nl)
FR (1) FR2152583B1 (nl)
GB (1) GB1355928A (nl)
IE (1) IE36656B1 (nl)
IT (1) IT967071B (nl)
LU (1) LU63876A1 (nl)
NL (1) NL170651C (nl)
NO (1) NO138536C (nl)
PL (1) PL77070B1 (nl)
RO (1) RO86025B (nl)
SE (1) SE403499B (nl)
TR (1) TR16958A (nl)
ZA (1) ZA725668B (nl)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3976631A (en) * 1973-04-18 1976-08-24 Stamicarbon B.V. Process for preparing ethylene polymers
US4010229A (en) * 1974-01-18 1977-03-01 Solvay & Cie Process for the manufacture of short fibrils
US4025593A (en) * 1971-08-06 1977-05-24 Solvay & Cie Fabrication of discontinuous fibrils
US4127623A (en) * 1974-08-03 1978-11-28 Sumitomo Chemical Company, Limited Process for producing polyolefin short fibers
US4189455A (en) * 1971-08-06 1980-02-19 Solvay & Cie. Process for the manufacture of discontinuous fibrils
US4416949A (en) * 1976-11-12 1983-11-22 Solvay & Cie. Composite panel comprising a metal foil and a polyolefine sheet
US5098452A (en) * 1990-08-24 1992-03-24 E. I. Du Pont De Nemours And Company Method for controlling the level of solvent vapor in a vessel
CN106149206A (zh) * 2016-08-19 2016-11-23 安徽元琛环保科技股份有限公司 一种纳米纤维‑针刺ptfe基布滤材的制备方法

Citations (12)

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US2072928A (en) * 1933-01-06 1937-03-09 Celanese Corp Manufacture of artificial materials
US2336743A (en) * 1941-10-13 1943-12-14 Fred W Manning Method and apparatus for spinning unwoven fabrics
US2357392A (en) * 1941-03-01 1944-09-05 Sylvania Ind Corp Process for producing fibrous products
US2411660A (en) * 1943-05-22 1946-11-26 Fred W Manning Method of making filter cartridges, abrasive sheets, scouring pads, and the like
US2515393A (en) * 1945-03-01 1950-07-18 American Viscose Corp Dry spinning system
US2906367A (en) * 1956-11-08 1959-09-29 American Viscose Corp De-gasifying liquids
US3026190A (en) * 1958-12-02 1962-03-20 American Viscose Corp Elastomer bonded abrasives
US3056719A (en) * 1959-07-09 1962-10-02 David R Webster Continuous web forming machine
US3094374A (en) * 1961-07-11 1963-06-18 Du Pont Dry spinning process for preparing coalesced spandex filaments
US3111368A (en) * 1963-11-08 1963-11-19 Du Pont Process for preparing spandex filaments
US3210452A (en) * 1962-11-06 1965-10-05 Monsanto Co Dry spinning of polyethylene
US3729374A (en) * 1967-02-28 1973-04-24 Papeteries Navarre Production of a fibrous web between an endless belt and an endless permeable belt

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2398831A (en) * 1944-05-06 1946-04-23 Du Pont Spinning apparatus and method
DK116229B (da) * 1957-06-11 1969-12-22 Du Pont Kontinuerligt extruderet eller spundet filamentprodukt og fremgangsmåde til dets fremstilling.
US3081519A (en) * 1962-01-31 1963-03-19 Fibrillated strand
FR1493680A (fr) * 1964-06-04 1967-09-01 Du Pont Appareil et procédé pour séparer et charger électrostatiquement une nappe de plexifilaments

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2072928A (en) * 1933-01-06 1937-03-09 Celanese Corp Manufacture of artificial materials
US2357392A (en) * 1941-03-01 1944-09-05 Sylvania Ind Corp Process for producing fibrous products
US2336743A (en) * 1941-10-13 1943-12-14 Fred W Manning Method and apparatus for spinning unwoven fabrics
US2411660A (en) * 1943-05-22 1946-11-26 Fred W Manning Method of making filter cartridges, abrasive sheets, scouring pads, and the like
US2515393A (en) * 1945-03-01 1950-07-18 American Viscose Corp Dry spinning system
US2906367A (en) * 1956-11-08 1959-09-29 American Viscose Corp De-gasifying liquids
US3026190A (en) * 1958-12-02 1962-03-20 American Viscose Corp Elastomer bonded abrasives
US3056719A (en) * 1959-07-09 1962-10-02 David R Webster Continuous web forming machine
US3094374A (en) * 1961-07-11 1963-06-18 Du Pont Dry spinning process for preparing coalesced spandex filaments
US3210452A (en) * 1962-11-06 1965-10-05 Monsanto Co Dry spinning of polyethylene
US3111368A (en) * 1963-11-08 1963-11-19 Du Pont Process for preparing spandex filaments
US3729374A (en) * 1967-02-28 1973-04-24 Papeteries Navarre Production of a fibrous web between an endless belt and an endless permeable belt

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4025593A (en) * 1971-08-06 1977-05-24 Solvay & Cie Fabrication of discontinuous fibrils
US4189455A (en) * 1971-08-06 1980-02-19 Solvay & Cie. Process for the manufacture of discontinuous fibrils
US3976631A (en) * 1973-04-18 1976-08-24 Stamicarbon B.V. Process for preparing ethylene polymers
US4010229A (en) * 1974-01-18 1977-03-01 Solvay & Cie Process for the manufacture of short fibrils
US4127623A (en) * 1974-08-03 1978-11-28 Sumitomo Chemical Company, Limited Process for producing polyolefin short fibers
US4416949A (en) * 1976-11-12 1983-11-22 Solvay & Cie. Composite panel comprising a metal foil and a polyolefine sheet
US5098452A (en) * 1990-08-24 1992-03-24 E. I. Du Pont De Nemours And Company Method for controlling the level of solvent vapor in a vessel
CN106149206A (zh) * 2016-08-19 2016-11-23 安徽元琛环保科技股份有限公司 一种纳米纤维‑针刺ptfe基布滤材的制备方法

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JPS4836423A (nl) 1973-05-29
RO86025B (ro) 1985-01-31
AU454391B2 (en) 1974-10-04
NL170651C (nl) 1984-10-16
CA1016314A (en) 1977-08-30
ATA774572A (de) 1975-10-15
FI54151C (fi) 1978-10-10
GB1355928A (en) 1974-06-12
DE2241163C2 (de) 1982-11-18
NO138536C (no) 1978-09-20
SE403499B (sv) 1978-08-21
IT967071B (it) 1974-02-28
CH539131A (fr) 1973-07-15
CS160064B2 (nl) 1975-02-28
JPS5439501B2 (nl) 1979-11-28
LU63876A1 (nl) 1973-03-09
FR2152583B1 (nl) 1975-01-03
IE36656B1 (en) 1977-01-19
AU4593672A (en) 1974-02-28
AT330941B (de) 1976-07-26
BE787890A (nl) 1973-02-23
DD100023A5 (nl) 1973-09-05
ES405987A1 (es) 1975-09-16
NL7211880A (nl) 1973-03-13
RO86025A (ro) 1985-01-24
ZA725668B (en) 1973-05-30
TR16958A (tr) 1974-01-17
BR7206179D0 (pt) 1973-07-17
DE2241163A1 (de) 1973-03-22
FR2152583A1 (nl) 1973-04-27
PL77070B1 (nl) 1975-02-28
FI54151B (fi) 1978-06-30
NO138536B (no) 1978-06-12
IE36656L (en) 1973-03-09
AR197577A1 (es) 1974-04-23

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