CN1535332A

CN1535332A - Spinnerette assembly for forming hollow fibers

Info

Publication number: CN1535332A
Application number: CNA018201946A
Authority: CN
Inventors: ��Ѷ��E��¶�; 塞缪尔·E·穆尔
Original assignee: LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Current assignee: LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Priority date: 2000-12-08
Filing date: 2001-12-06
Publication date: 2004-10-06
Anticipated expiration: 2021-12-06
Also published as: ATE428008T1; DE60138306D1; EP1354081B1; JP2004518832A; WO2002066715A1; EP1354081A1; TW580526B; CN1300391C; JP4001819B2

Abstract

The invention provides a spinnerette assembly (300) for forming single component and multicomponent hollow fibers of the sheath/core type. The spinnerette assembly contains an extrusion orifice (355) and a core forming material passage (350) in communication with the extrusion orifice . A hollow needle (330) extends through the extrusion orifice in a concentric manner to define an annular passage (353) surrounding the needle (330). The core forming material passage (350) includes a core forming material inlet port (351) extending from a surface of the spinnerette assembly to an anterior of the assembly and a transverse passage (352) extending from the core forming material port to the annular passage surrounding the needle. A bore forming fluid passage (312; 314) communicates with the interior of the needle. The spinnerette assembly for multicomponent hollow fibers contains at least one sheath forming material passage also in communication with the extrusion orifice.

Description

Form the spinneret assembly that hollow fibre is used

The present invention relates to form the spinneret assembly that hollow fibre is used, particularly a kind of improved spinnerets can be more effective and accurately produce multi-component hollow fibre.People know the various hollow fibres of generally being made by one or more polymeric materials can be used to various uses, the barrier film that for example insulation material of the packing material of carpet, pillow, felt and clothes, gas separate, haemodialysis, water clarification and other filter operations are used.With regard to the barrier film purposes, hollow fibre can be made of one pack system or multicomponent, as around the core that foreskin is arranged on hollow-core construction as separating layer, but at this moment the fiber bunchy is arranged on and becomes a separator that is called as the dialysis layer in the tubular shell.Usually hollow fibre is thinner, and diameter only is about 30 to 1000 microns.Therefore equipment and the method for making hollow fibre must be very accurately so that the diameter of energy controlling fiber and the concentricitys of core and foreskin wound hole.

For producing one pack system hollow fibre and foreskin/core type multicomponent hollow fibre, once designed multiple spin pack.Particularly, once proposed various devices so that guaranteeing the liquid that will form fiber is fed on the eyelet of spinnerets equably, purpose is that to make the hollow fibre of production all be uniform aspect diameter, composition and the concentricity.At this moment facility of spinnerets use is supplied the fluid that is positioned at the spinning eyelet so that form the hole of hollow fibre.A common for this purpose available tubule or pin are discharged orifice flow body a kind of gaseous state or liquid in this pipe, take the space in the hole like this, and make the core of fiber be extruded out around this orifice flow body in the eyelet of spinnerets.For the spinning of liquation, newborn fiber can cool off in gaseous state or liquid cooling fluid and be solidified.For the spinning of solution, newborn fiber can be solidified by the evaporation of solvent, or by contacting the wall that the cohesion that causes polymer solution forms fiber with solvent extraction liquid.

A kind of typical spin pack is as at BP UK830, the illustrated multicomponent fibre that is used in No. 441, comprise spaced apart but the header board that faces one another and back plate so that a liquid channel is provided betwixt.Header board is provided with an extruded hole that runs through, and in two plates, have at least a plate on the one side of another plate, being provided with tableland type depression, the material stream that forms foreskin is radially assembled to the inlet in hole basically so that liquid channel is limited in the zone of an encirclement extruded hole inlet.There is a tubule to be positioned in the inlet in hole in addition so that the supply orifice fluid.But the problem that continues to take place is how to supply the material that forms core and foreskin when forming multi-component fiber equably.Most of spinneretss of this pattern are made mostly by hand, once do one.As a result, be that the part that a spinnerets is made always can not be fit to another spinnerets.Part just can not exchange like this, and it is useless that any damage of a part of spinnerets can make whole sub-assembly become.When assembling or cleaning the spinnerets of traditional bi-component or hollow fibre, be easy to make the tubule of injecting fluid or pin slight curving in addition to cause it to leave the center of spinning eyelet.Spinnerets could use after just must repairing when this takes place.

Another problem relevant with traditional spinnerets relates to is making concentricity between the hole of one pack system hollow fibre and the fibre wall and between the core of multicomponent hollow fibre and foreskin.The formed hollow fibre of traditional spinnerets is easy decentraction aspect hole/fibre wall and core/foreskin.Foreskin and core most important to obtaining uniform fibers with one heart.The flowing of (mensuration) polymer of adjusting on the surface of measuring with instrument by adjusting traditionally with one heart of foreskin and core obtains.The surface of measuring with instrument is to produce like this, make to produce a narrow and small opening between them when two of machineds closely are surperficial, and the pressure and the flow rate that measure with instrument after overregulating when this opening is extruded when polymer should be uniform.United States Patent (USP) 3,458, once disclose one for No. 615 and kept the concentric method of foreskin/core, whether this method is even with instrument measurement along circumference when the core of polymer is extruded at the preputial ring of polymer, comprises that also the polymer ring that makes foreskin becomes the liquid stream with inclined wedge-shaped of a ring-type around axially going up the liquid stream that forms.

In order to keep the concentric of fibre wall wound hole, other spinneretss once were provided with the part of the hole centring that makes tubule and spinnerets.For example United States Patent (USP) 4,493, and the spinneret assembly that a module once was described for No. 629 is furnished with the eyelet centring that a plurality of screws that pass spinnerets with screw thread are used for making tubule and spinnerets.But these adjustment screw are also unreliable, and make tubule shift out concentric adjusting easily when spinnerets is disassembled, cleans when ressembling then.In order to produce dawn number and all consistent hollow fibre of other characteristics, once proposed many devices and guaranteed that the liquid that will form foreskin uniformly was fed on the eyelet of porous spinnerets equably with a plurality of concentric layers and thickness.These devices generally include the variation of diameter or position and the monolithic or the polylith spinnerets of eyelet.Up to now, the shortage concentricity and the uniformity remain a problem when making this one pack system and multicomponent fibre.

Existing another problem of spinnerets is the ability that sends one or more polymeric liquids around the tubule in the spinnerets or pin equably.United States Patent (USP) 5,320 once disclosed a kind of spinnerets, and was shaped on a plurality of material passage of separating around pin on it and can sends polymeric liquid around pin for No. 512.But when polymeric liquid flows through the host polymer fluid passage, must merge together so that form an independent annular flow by coalescence around tubule or pin from the polymeric liquid of each passage.If can not be converged completely, the crack will appear in that section fibre length on the interface that each strand liquid stream fails fully to assemble so.Therefore Design of spinneret preferably can be produced with one heart and uniform fibers and do not have the danger in generation crack.

The suitable above-mentioned restriction that is used for overcoming traditional spinnerets of the improved spinnerets that production hollow fibre provided by the present invention is used.This novel spinnerets can be produced uniform one pack system of size and multicomponent hollow fibre consistently, and wherein fibre wall can be highly precisely concentric with the hole.When doing like this, this spinnerets can also reduce the defective in the hollow fibre in addition, prolongs the production run time of hollow fibre, reduces the maintenance time of spinnerets, simplifies the manufacturing of spinnerets.This invention can be produced the high-quality multicomponent fibre that has one or more wrapper layers effectively particularly well.

In order to reach above-mentioned these purposes, a first aspect of the present invention is the spinneret assembly that is used for forming hollow fibre, and this sub-assembly comprises:

At least one extruded hole of in said spinnerets, making;

One extends through the hollow needle of each said extruded hole with concentric manner, as a means of the passage that forms a ring-type around the said pin in said extruded hole;

One forms the fluid passage in hole and the internal communication of each said pin;

At least one of making in said spinneret assembly forms the material passage of core,

Wherein the material passage of each said formation core comprises that a material inlet that forms core extends to the inside of said sub-assembly and at least one interconnection and extends to each said annular channel from the material inlet of said formation core from a surface of said sub-assembly.

This novel spinnerets can provide such composite hollow fiber aptly, and promptly this fiber has an open pore that is formed by tubular core portion fibre wall, is radially outwards then surrounded by the wrapper layer of a tubulose from fibre wall.Need add the material passage that first forms foreskin on inner core, this passage has the material inlet that forms first foreskin on a surface of said spinneret assembly, and extends on each said annular channel for this reason.

Another aspect of the present invention is a kind of method that forms hollow fibre, and this method comprises following operation:

The material that forms core is sent in each annular channel in the spinneret assembly, entering in the said spinneret assembly of the material of said formation core is the inlet by one or more formation core materials and flows through in inside to one interconnection of said sub-assembly, the part of said interconnection is surrounded each pin in a continuous manner fully, and is communicated with extruded hole by annular channel;

Make the material that forms core push by extruded hole and around each said pin,

The fluid that forms the hole is expelled in each pin, thus provide have the fluid that forms the hole and the position at the center of said formation core material, the material of said at that time formation core is leaving spinneret assembly by extruded hole;

By cooling, solvent evaporation or solvent extraction hollow fibre is solidified, and

Optional way before hollow fibre solidifies, makes the hollow fibre of new extruding move through an air gap.

Below by preferred embodiments and drawings explanation the present invention, in the accompanying drawings:

Figure 1A is the top view according to the suitable spinnerets that is used for manufacture order component hollow fibre of a preferred embodiment of the invention;

Fig. 1 is for according to the suitable top view that is used for producing the spinnerets of multicomponent hollow fibre of another preferred embodiment of the present invention;

Fig. 2 A and Fig. 2 are respectively the cutaway view that the embodiment among Figure 1A and Fig. 1 cuts along the A-A line, the configuration of an extruding shown in the figure;

Fig. 3 is the another kind structure of the spinnerets body of suitable first preferred embodiment that is used for making the multicomponent hollow fibre;

Fig. 4 is used for spinning out from the material passage of single formation core the top view of the another preferred embodiment of the present invention of many long filaments;

Fig. 5 is the cutaway view that is used for spinning the another preferred embodiment of the present invention of multilayer foreskin hollow fibre.

Target of the present invention is to make to be used for multi-purpose hollow fibre, especially for the membrane separation purposes, especially is used for divided gas flow.The citation form of hollow fibre is the cylindrical tube that open at two ends, and its wall has uniform composition.The hollow fibre of this form is called as " one pack system " fiber sometimes.The central opening that forms the fiber hollow parts is called as " hole " occasionally.Also can be made into " multicomponent " hollow fibre.The layer that the tube wall that " multicomponent " speech means hollow fibre is made up of difference is made.Interior one deck adjacent with the hole is called as " core " of fiber at this paper.The skin that surrounds the multicomponent fibre core layer is called as " foreskin " portion.What adopt traditionally is that radially outside one deck with the adjacent core layer is called " first foreskin " layer or portion to outer field recognition methods.And the skin that will continue is called " first foreskin ", " second foreskin ", " the 3rd foreskin " layer or portion or the like.For the uniformity of term, the one pack system hollow fibre is even without foreskin portion, and its wall portion is also referred to as the core of fiber at this paper.

Be used for pushing in first preferred embodiment of the present invention of many one pack system hollow fibres, shown in Figure 1A and 2A, spinneret assembly 100 comprises a spinnerets body 110, base plate 120 and a plurality of pin 130.Specific arrangements shown in Figure 1A can be pushed 12 hollow fibres simultaneously, but if needed, spinneret assembly 100 also can be revised as many long filaments of a manufacture order Zhi Changsi or any number.The near-end of each pin 130 is fixed in the relevant dress pin hole of making in the spinnerets body 111, and make with boring or other machine-tooled methods in these holes.The size of the diameter of the overall diameter of the near-end of pin 130 and installing hole 111 is preferably formulated the near-end that makes pin 130 like this and can be press-fitted in the dress pin hole 111, thereby can there be the ground of leakage pin 130 is not fixed in the spinnerets body.Pin 130 can be fixed in the spinnerets body in any suitable manner, as long as can make the hole of pin 130 near-ends be connected to the fluid passage 112 that forms the hole in the spinnerets body.Base plate 120 usefulness securing members 131 are screwed in the hole 132 as bolt etc. and are fixed on the spinnerets body 110.Making a plurality of tubaeform recesses on base plate 120 makes many fibers that squeeze out can leave spinneret assembly 100 without interfering with each other.A plurality of in a preferred embodiment extruding configurations can be arranged in line or be circular.

The fluid passage 112 in the formation hole of making in spinnerets body 110 extends through spinnerets body 110 and comes relevant dress pin hole 111 and the channel connection of making by pin 130.Each fluid passage 112 that forms the hole has a fluid inlet port 113 that forms the hole on the surface of spinnerets body 110.This structure can be introduced in the fiber that is extruded the fluid that forms the hole, makes to be extruded fiber and to keep its hollow-core construction, and its mode will illustrate below.

Also be shaped on the material passage 150 that forms core in spinnerets body 110, by this passage, the material such as the polymeric material that form core are sent to extruded hole 155.Each material passage 150 that forms core has an inlet port 151, and this mouthful is that extend by the direction that is arranged essentially parallel to pin 130 in a hole.Each material passage 150 that forms core comprises that also an interconnection 152 extends to the top of the annular channel 153 that forms extruded hole 155 tops from the inlet port 151 that forms core.Interconnection 152 is that make to the back cutting of conduit wall the inside that extend into sub-assembly by the material inlet port 151 that forms core with a cutter in spinnerets body 110.Interconnection 152 extend to surround fully pin 130 make the material that forms core can be evenly distributed in pin 130 around and be incorporated into equably in

annular channel

153 and 154.

Suitable another preferred embodiment that is used for producing simultaneously the novel spinneret assembly of many multicomponent hollow fibres can be understood in conjunction with Fig. 1 and 2.Identical parts in different figure is pointed out with identical label.Be communicated with the gap that between spinnerets body 110 and base plate 120, forms at the groove of making on spinnerets body 110 basal surfaces 144 and 145.Be located at the size in the pad 140 qualification gaps 141 between spinnerets body 110 and the base plate 120, around the material that this gap 141 makes the material that forms foreskin send to equably with concentric pattern to form core, the material that forms core at that time flows through

annular channel

153 and 154.

The material inlet port 142 of the formation foreskin of making in spinnerets body 110 is communicated with groove 144 with the material passage 143 that forms foreskin, makes the material that forms foreskin can pass through to form the material inlet port 142 of foreskin with the material passage 143 that forms foreskin, by

groove

144 and 145, also by gap 141.When the material that forms foreskin leaves gap 141, it just the confluce of gap 141 and annular channel 154 be evenly distributed in the formation core material around.

Discuss above-mentioned novel spinneret assembly now.Suppose that what will make is multi-component hollow fibre.If manufacture order component hollow fibre, the operation and the equipment of the formation foreskin in discussing below should.

During operation, spinneret assembly 100 is installed on the spinning machine, installs to be to use suitable retention mechanism to be undertaken by installing hole 115 as bolt etc.The material supply of the fluid supply in the formation hole of machine, the material supply that forms core and formation foreskin is coupled to fluid inlet port 113, the material inlet port 151 that forms core that forms the hole respectively and forms on the inlet port 142 of foreskin.Notice that each extruded hole 155 respectively has a material inlet port 113 and a material inlet port 151 that forms core that forms the hole; And material inlet port 142 that forms foreskin will be by forming foreskin material passage 143 and groove 144,145 and gap 141 material that will form foreskin send on each extruded hole.As long as these inlet ports can be arranged to any way and can be that any number can send to material in the suitable passage suitably.For spinning hollow fiber, form the material of core, the fluid that forms the material of foreskin and form the hole and sent to simultaneously and push (i.e. spinning) with flow rate by known pressure in the spinnerets 100 and become hollow fibre.Typical case is, the material that forms core is injected with the pressure of about 300-500psig, and the material that forms foreskin is injected with the pressure of about 150-300psig, and the fluid in formation hole is injected with the pressure of about 4-5psig.

The material that forms core flows through the material inlet port 151 that forms core, the material passage 150 by forming core, enter interconnection 152 enters into annular channel 153.Simultaneously, the material that forms foreskin flows through the material inlet port 142 that forms foreskin, enters into groove 144 by the material passage 142 that forms foreskin.The size that should be noted that groove 144 is designed like this, makes the material that forms foreskin when entering each bar groove 145, is in substantially the same pressure, and the material that forms foreskin is sent by gap 141 equably.When leaving gap 141, the material and the gap location intersection of material between upper and lower

annular channel

153 and 154 that forms core of the formation foreskin that flows along circumference so just can form one with one heart around the even clad of the material of the formation foreskin of the outer surface of formation core.In addition, pass through spinneret assembly 100 in company with the transmission of the material that forms core and crust, the fluid that forms the hole is injected in the fluid inlet port 113 that forms the hole, by forming the fluid passage 112 in hole, enters in the pin 130.The orifice flow body when the far-end of pin 130 comes out, its position or in extruded hole 155 or just in time in the downstream of extruded hole.Because forming the material of core and foreskin is extruded at the same time by following annular channel 154, come out from extruded hole 155, and with one heart around pin 130, and the fluid that forms the hole also sprays in pin, pushing the finished product that comes out like this is a fiber, the heart has the fluid that forms the hole therein, surrounded by a material that forms core, and the material that is formed foreskin around core is coating with one heart.

As seen from Fig. 1 and 2, the passage of interconnection for behind wall, cutting out from the vertical passageway, its end surrounds pin 130 in a continuous manner fully, and is communicated with last annular channel 153.This structure can be eliminated the material that will form core and be evenly distributed in pin 130 problem on every side.Also can eliminate the material stream of multiple formation core in annular channel owing to not exclusively converge problem that longitudinal crack occurs as at United States Patent (USP) 5,320, disclosed such in No. 512.And when spinneret assembly is removed in frame, all can therefore clean the spinnerets ratio and be easier to easily by approaching owing to form the material passage 150 and the interconnection 152 of core.This can make spinnerets clean easily and reduce turnover period.And the material passage 150 of formation core can be used the method machined easily of holing in the spinnerets body, and interconnection 152 can use angled electrode to make easily and accurately with the electrical discharge machining (EDM) technology.In addition, because pin 130 is securely fixed in the installing hole 111 of spinnerets body, it is hereby ensured that pin is aligned in upper and lower

annular channel

153 and 154 with one heart, take a lot of work like this and complicated alignment procedures just can save, thereby can further reduce turnover period.

Compare with traditional spinnerets, the preferred embodiments of the present invention have only less part and easier manufacturing.Fig. 3 illustrates the another kind of the spinnerets body of first preferred embodiment and constructs the manufacture process that can further simplify spinnerets.In first preferred embodiment that in Fig. 2, draws, form the hole fluid passage 112 must by an angle and highly precisely machined be communicated with and do not damage and have only complete than the dress pin hole 111 of minor diameter as a means of merging with dress pin hole 111 exactly as boring.But the spinnerets body of Fig. 3 has the machining processes of another design economization by complexity, so just can reduce the manufacturing expense of spinnerets.Specifically, be the fluid passage 114 that second of other machined forms the hole, this passage is parallel with the material passage 150 that forms core basically, extends to dress pin hole 111 from the surface of spinnerets body 110, and parallel with dress pin hole 111.Because the fluid passage 114 in the second formation hole is coaxial with dress pin hole 111, machining process just can greatly be simplified.The fluid passage 112 in the formation hole that machined is made in spinnerets body 110 ' originate in form the hole fluid inlet port 113 and with second fluid passage 114 that forms the hole one basically away from the point of dress pin hole 111 on intersection.The fluid passage 112 in angled formation hole ' make with second fluid passage 114 (this passage can carry out machined before angled passage 112 ' machined) that forms the hole with machined easily is communicated with, because angled passage 112 ' and to compare with the diameter of adorning pin hole 111 with the diameter of passage 114 all be bigger.Before installing to spinneret assembly on the frame or at that time the opening that forms the fluid passage 114 in hole of second on the spinneret assembly face can clog or seal in order to avoid forms the fluid leakage in hole with stopper.Alternative design among Fig. 3 is all similar to the design among top said Fig. 2 in other respects.

Shown in Figure 4 according to second preferred embodiment of the present invention, this figure a kind of method of drawing can double the fiber number of each spinnerets production.For illustrative purposes with clear for the purpose of, the employed label of Fig. 4 all than Fig. 1,2 and 3 in the label of corresponding part big by 100.Fig. 4 is the top view of spinnerets body 210.A present embodiment outstanding details different with drawn embodiment among Fig. 1,2 and 3 is that the material passage 250 of each formation core all is shaped on two interconnection 252a and 252b, and each all is to cut to form behind wall.Each interconnection 252a and 252b respectively are provided with annular channel 253a and 253b (corresponding to the annular channel in Fig. 2 and 3 153) and pin 230a and 230b (corresponding to the pin in Fig. 2 and 3 130).And in Fig. 1,2 and 3, between the spinnerets body 210 of present embodiment and base plate 220, corresponding details is arranged also in other details between spinnerets body 110 and the base plate 120.As in Fig. 3 and 4, interconnection 252a and 252b from the material passage 250 that forms core extend to annular channel 253a and 253b the edge and around each pin 230a and 230b of corresponding extruded hole.A plurality of pin 230a and 230b are set in the spinnerets body 210 and with the fluid passage 214a and the 214b that form the hole and are communicated with.Each pin extends through corresponding extruded hole 255a and 255b, and this extruded hole 255a and 255b are formed by columnar upper and lower annular channel 253a, 253b and 254a, 254b respectively.Be communicated with the gap 241a and the 241b that between spinnerets body 210 and base plate 220, form at the groove 244 that forms on the basal surface of spinnerets body 210 and 245.Be arranged on the size that pad 240 between spinnerets body 210 and the base plate 220 limits gaps 241, this gap size make form foreskin material can with concentric pattern send to equably in the confluce of gap 241a, 241b and annular channel 254a, 254b the material that forms core around.The material passage 243 of the material inlet port 242 of the formation foreskin of making in spinnerets body 210 and formation foreskin is communicated with groove 244, therefore the material that forms foreskin can be sent out by material inlet port 242 that forms foreskin and the material passage 243 that forms foreskin, by groove 244 and 245, and by gap 241a and 241b.The fluid that forms the hole is supplied on the spinnerets body 210 by the fluid inlet port 213 that forms the hole, is distributed in each fluid passage 214a and 214b that forms the hole by groove 212 ' a and 212 ' b from each such inlet port 213.Therefore, this spinneret assembly 200 can be linked on same the frame and produce fiber more than the twice.Those skilled in the art also can imagine the fiber multiple of producing is brought up to greater than 2 (for example 3,4,5) according to above embodiment.

Fig. 5 illustrates suitable the 3rd preferred embodiment that is used for making three component hollow fibres of the present invention.For illustrative purposes with clear for the purpose of, in Fig. 5 to Fig. 1,2 and 3 in the corresponding used label of member bigger by 200 than Fig. 1,2 and 3 label.Spinneret assembly 300 comprise spinnerets body 310, base plate 320, a plurality of pin 330 (one of them can be seen) in Fig. 5 and be located at spinnerets body 310 and base plate 320 between middle plate 360.Pad 340a is set between spinnerets body 310 and the middle plate 360, and pad 340b is set between middle plate 360 and the base plate 320.In use spinnerets body 310, middle plate 360, base plate 320, and pad 340a and 340b be assembled in aggregates as following explanation.The near-end of each pin 330 for example is fixed in the relevant dress pin hole 311 with interference fit, and these dress pin holes are made in spinnerets body 310 with boring or other machine-tooled methods.Base plate 320 and middle plate 360 usefulness securing members 331 are screwed in the through hole 332 as bolt etc. and are fixed on the spinnerets body 310, and pad 340a forms gap 341a and pad 340b forms gap 341b at that time.

In spinnerets body, middle plate and base plate, make the hole suitable respectively with annular channel 353,363 and 354.By these holes, material, the core material that forms core adds that the material of the first formation foreskin and the material of formation core add that first and second materials that form foreskins are extruded out respectively.The hollow fibre of this new life's three components finally leaves spinnerets by extruded hole 355.Be shaped on tubaeform recess 356 on the basal surface of base plate 320, the fiber that each is squeezed out leaves spinneret assembly 300 and does not hinder the further processing of frame.Being shaped on groove 344a and 345a on the basal surface of spinnerets body 310 is communicated with gap 341a.Being shaped on groove 344b and 345b on the top surface of base plate 320 is communicated with gap 341b.

Forming the material of core such as the polymeric material material passage 350 by the formation core made in spinnerets body 310 is introduced in each extruded hole.Each material passage 350 that forms core all includes the material inlet port 351 that forms core, and this inlet port is one in upwardly extending hole, the side substantially parallel with extruded hole.Each material passage 350 that forms core also includes interconnection 352, and this interconnection extends to the top of annular channel 353 from the material inlet port 351 that forms core, and the top of extruded hole is formed on this top.Interconnection 352 is to be inserted through the material inlet port 350 that forms core at spinnerets body 310 usefulness cutters cut to form and extend to behind wall and surround pin 330 fully the material of formation core can be incorporated in the annular channel 353 equably.

The fluid passage 312,314 in the fluid inlet port 313 in the formation hole of making in the spinnerets body and formation hole is communicated with dress pin hole 311.The configuration fiber that the fluid that forms the hole can be introduced in squeeze out is as a means of the hollow-core construction that keeps squeezing out fiber like this, and its mode is as described below.

The material inlet port 342a of formation first foreskin of making in spinnerets body 310 is communicated with groove 344a, the material that forms first foreskin can be introduced in its inlet port, by forming the material passage 343a of first foreskin, enter groove 344a and 345a, by gap 341a, then enter in the annular channel 363.

Similarly, being shaped on the material inlet port 342b that forms second foreskin on base plate 320 is communicated with groove 344b, the material such as the polymeric material that form second foreskin can be introduced in its inlet port 342b, by forming the material passage 343b of second foreskin, enter groove 344b and 345b, by gap 341b, then enter annular channel 354.Other aspects of the 3rd preferred embodiment are similar to first preferred embodiment.

The operation of the 3rd preferred embodiment except second foreskin as mentioned above, also similar to first preferred embodiment.When the material that forms second foreskin enters annular channel 354, it by be laid in equably from annular channel 363 flow the materials of the coming material of the formation core that forms the first foreskin material (as be coated with) around.Therefore the hollow fibre of making just can have a core, one and be coated on first foreskin on the core and one equably and be coated on first foreskin equably and add second foreskin on the core, and all levels all is concentric.

Each inlet port, groove and passage in above-mentioned spinneret assembly can by any means and can have any number so that produce the fiber with multilayer foreskin and core.The material passage that for example forms core can have Any shape and can have a plurality of grooves or single groove.Spinneret assembly can be with any known technology machined, as boring, electrical discharge machining (EDM) or any other suitable method.Extruded hole can be any number.The present invention can be used to make the hollow fibre of any pattern or with the material manufacturing of any suitable extruding.Various angles and size can be changed to be fit to concrete purposes.Spinneret assembly can be with any suitable material such as steel, Meng Naier, titanium, aluminium or its alloy.Forming core and foreskin can be with material such as molten polymer or solution, the ceramic paste etc. of any suitable extruding.The fluid that forms the hole for example can be inert gas or liquid.

The present invention illustrates by preferred embodiment, but can make various modifications under the situation of not leaving the scope of the invention.Scope of the present invention should be with being as the criterion that claims limit.

Claims

1. spinneret assembly that is used for forming or many fibers comprises:

At least one extruded hole of in said spinneret assembly, making;

One extends through the hollow needle of each said extruded hole with concentric manner, thus in said extruded hole said pin around form an annular channel;

Fluid passage with the formation hole of each said pin internal communication;

Wherein each material passage that forms said core all comprises a material inlet port that forms core, and this inlet port extends to the inside of said sub-assembly and has at least an interconnection to extend to each said annular channel from the material inlet port of said formation core from a surface of said sub-assembly.

2. spinneret assembly as claimed in claim 1, it is characterized in that, also comprise the material passage that forms first foreskin, this passage has a material inlet port at lip-deep formation first foreskin of said spinneret assembly, and the material passage that forms first foreskin extends to each said annular channel.

3. spinneret assembly as claimed in claim 2, it is characterized in that, also comprise a material inlet port that forms second foreskin, this passage has a material inlet port at lip-deep formation second foreskin of said spinneret assembly, and the material passage that forms second foreskin extends on each said annular channel.

4. spinneret assembly according to any one of the preceding claims is characterized in that, interconnection is the part that the material passage of said formation core cuts out behind wall, and this part is surrounded said pin in a continuous manner fully and is communicated with said extruded hole.

5. spinneret assembly as claimed in claim 4 is characterized in that, the material inlet port that forms core is arranged essentially parallel to said extruded hole and extends, and said interconnection is substantially perpendicular to the material inlet port of said formation core and extend.

6. spinneret assembly as claimed in claim 1, it is characterized in that, also comprise a spinnerets body, one because first pad and first plate that separates with the spinnerets body, first pad is located between said spinnerets body and said first plate and suitable first gap that forms betwixt.

7. spinneret assembly as claimed in claim 2, it is characterized in that, also comprise a spinnerets body, one because first pad and first plate that separates with the spinnerets body, first pad is located between said spinnerets body and said first plate and suitable first gap that forms betwixt.

8. as claim 6 or 7 described spinneret assemblies, it is characterized in that extruded hole extends through the said spinnerets body of part and first plate.

9. as claim 6 or 7 described spinneret assemblies, it is characterized in that first gap becomes the part of the material passage that forms first foreskin.

10. spinneret assembly as claimed in claim 7 is characterized in that, also comprises second plate, and this plate is positioned at a side of opposing with the spinnerets body on first plate, has one second gap to be located between first plate and second plate and suitable second gap that forms betwixt.

11. spinneret assembly as claimed in claim 10 is characterized in that, extruded hole extends through the said spinnerets body of part, first plate and second plate.

12. spinneret assembly as claimed in claim 11 is characterized in that, second gap becomes the part of the material passage that forms second foreskin.

13., it is characterized in that comprise that also at least one is fixed on the pin in the dress pin hole, this dress pin hole is a part of making and admitting first said pin in said spinnerets body as claim 6,7 or 10 described spinneret assemblies.

14. spinneret assembly as claimed in claim 13 is characterized in that, each said dress pin hole is communicated with fluid inlet port in a lip-deep formation hole of said spinneret assembly by a fluid passage that forms the hole.

15. spinneret assembly as claimed in claim 14, it is characterized in that, the fluid passage that forms the hole comprises that a fluid line that forms first hole also is communicated with said coaxial needle, with a fluid line that forms second hole, the orientation of this pipeline and the fluid line that forms first hole and extend to a surface of said spinnerets body at angle from the fluid line in said formation first hole.

16., it is characterized in that having a plurality of interconnections to extend out as claim 1,2,3,6,7 or 10 described spinneret assemblies from the material inlet port that each forms core.

17. a method that forms hollow fibre comprises following operation:

The material that forms core is sent in each annular channel in the spinneret assembly, the material of said formation core is by the material inlet port of one or more formation cores, interconnection is come in the inside that flows through said sub-assembly, the part of said interconnection is in a continuous manner fully around each pin, and is communicated with extruded hole by annular channel;

The material that extruding forms core makes it pass through extruded hole and around each said pin;

The fluid that forms the hole is expelled in each pin, thus when the material that forms core leaves spinneret assembly by extruded hole formed fiber therein the heart have the fluid in formation hole;

With cooling, solvent evaporation or solvent extraction hollow fibre is solidified; And

Can be randomly, before hollow fibre solidified, the hollow fibre that makes new extruding was by an air gap.

18. method as claimed in claim 17, it is characterized in that, also comprise an operation, promptly form around the material of core, come out thereby form the extruded hole of a multi-level composite fibre by spinneret assembly with fluid, the material that forms core that forms the hole and the material that forms foreskin when the material that forms core is laid in the material of at least a formation foreskin along laterally by each said annular channel the time with one heart.