WO1990006801A1 - Hollow fiber vertical quench bath - Google Patents
Hollow fiber vertical quench bath Download PDFInfo
- Publication number
- WO1990006801A1 WO1990006801A1 PCT/US1988/004371 US8804371W WO9006801A1 WO 1990006801 A1 WO1990006801 A1 WO 1990006801A1 US 8804371 W US8804371 W US 8804371W WO 9006801 A1 WO9006801 A1 WO 9006801A1
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- Prior art keywords
- tube
- spinneret
- liquid
- vessel
- fiber
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/08—Hollow fibre membranes
-
- 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
- D01D5/24—Formation of filaments, threads, or the like with a hollow structure; Spinnerette packs therefor
Definitions
- the present invention relates to the manufacture of hollow porous fibers produced from a liquid polymer solution, and particularly to the quenching of those fibers in a quench bath following their extrusion.
- hollow porous fibers i.e., microporous, and in particular skinless nylon microporous filter fibers
- microporous i.e., microporous
- skinless nylon microporous filter fibers i.e., i.e., kaolin, and in particular skinless nylon microporous filter fibers. See, for example, U.S. Patent 3,876,738 to Marinaccio and Knight and U.S. Patent 4,604,208 to Chu et al.. the entire disclosures of which are incorporated herein by reference.
- hollow porous fibers involve extruding a hollow tube of liquid polymer solution, referred to as dope, into a chemical quenching solution, which causes the hollow porous fiber structure to form.
- a chemical quenching solution which causes the hollow porous fiber structure to form.
- the dope emerging from the extrusion die referred to as a spinneret
- a spinneret is essentially still in liquid form. It gradually solidifies over time while exposed to the chemical quenching solution held in a quench bath.
- the present invention provides a hollow fiber vertical quench bath having a relatively shallow main quench bath tank which communicates directly with a tall, thin, vertical extension tube that is filled with the bath liquid and that provides the needed vertical quench bath beneath the spinneret.
- the hollow fiber extruded from the spinneret passes vertically down through the thin, elongate vertical extension tube where it is quenched by the bath liquid and gradually solidifies.
- Beneath the tube and in the main quench bath tank is positioned a guide roll or other means for changing the direction of the fiber. Then the redirected fiber moves generally horizontally away from beneath the vertical extension tube and through the shallow quench bath to the fiber exit.
- the invention provides the dual benefit of a tall or deep quench bath for the vertical portion of the fiber travel path and a wide, shallow quench bath for the horizontal portion of its travel.
- the vertical extension tube supported above the shallow quench bath, has a lower end which is beneath the surface of the shallow quench bath.
- the spinneret is held at the top of the vertical extension tube, and the vertical extension tube is sealed around the spinneret.
- the spinneret may be disposed in a piston which is sealed at the top of the tube.
- a vacuum is drawn in the vertical extension tube, e.g. by starting with the spinneret holding piston at the bottom of the vertical tube and drawing the sealed piston up the vertical tube or by starting with the piston sealed at the top of the tube and drawing a vacuum in the tube.
- the level of liquid in the vertical tube is raised preferably up to the exit from the spinneret so that the dope moves through the chemical quenching solution over the maximum vertical path. Also, for some dope systems, it is desirable not to expose the dope to an atmosphere other than that of the liquid quench solution.
- the vertical distance between the spinneret and the fiber guide roll around which the fiber is redirected is maximized, assuring that the fiber ultimately has the most circular cross section possible.
- the quench solution in the extension tube is relatively quiescent, because the cross section of that tube is smaller. This is important to preservation of the fiber due to the low physical strength of the nascent fiber, especially at the top of the tube when the fiber is in its most liquid state.
- One particular benefit is that the bath liquid in the shallow, main quench tank can be agitated to prevent stratification in that tank. Agitation is possible because the agitation in the main tank does not travel through the narrow extension tube and because the extension tube protects the fiber where it is most delicate and weak.
- the quench fluid in the extension tube might build up an excessive concentration of solvent for the polymer and/or exhausted solvent.
- the supply may be through a porous sparger at the top of the tube, for example.
- Fig. 1 is a schematic cross sectional view of a fiber spinning apparatus and quench bath according to the present invention with the fiber spinning apparatus and quench bath in the operational position.
- Fig. 2 is the same view as Fig. 1, before fiber spinning according to the invention begins and illustrating the features of the invention.
- a quench bath according to the present invention is used for hardening hollow porous fibers • which are extruded in a hollow tube of liquid polymer solution, called a dope.
- extrudable polymer solutions are well known in the art and include, for example, those described in U.S. Patents 3,876,738 to Marinaccio and Knight, 4,604,208 to Chu et al, as well as U.S. Patent 4,340,479 to Pall. the entire disclosures of which are incorporated herein by reference.
- the quench bath is contained in a relatively larger cross section main tank or vessel 12, which has a relatively long length in the direction along which the fiber is drawn generally horizontally, but which could be considerably narrower in the width direction, having to be wide enough to permit passage of the fiber and to permit access into the quench bath vessel for cleaning and to provide space for other objects, such as a guide roll, described below, which must be placed within the vessel 12.
- the vessel 12 is generally unpressurized, and is illustrated as being open-topped, although that is not required.
- the vessel has an outlet opening 14 in its side through which the by then hardened, solidified fiber is drawn out of the bath vessel 12 to be received on a storage roll 16, for example.
- a vertical extension tube 20 which is considerably narrower in its width along the length dimension of the vessel 12 than is the length of the vessel.
- the tube 20 is preferably also of narrower width than the vessel 12, i.e. of much smaller cross-section than the vessel 12.
- the vertical extension tube need merely be of a cross section sufficiently larger than the fiber that moves through it, that the liquid in the vertical extension tube can adequately quench the fiber and cause it to solidify, by acting upon it. If the tube were too narrow, there would not be sufficient circulation around the just extruded fiber and quench chemicals would be too rapidly exhausted and/or contaminated, e.g. with polymer solvent.
- the tube is supported at 24 in the vessel at a height such that the bottom 26 of the tube 20 would normally be below the surface 28 of the liquid 30 in the vessel 12.
- a vertical extension tube between the exit from the spinneret and the top of the liquid bath in the vessel 12, might have a height of 60 in. and might have a cross sectional area of 7-14 sq. in.
- the tube 20 typically has a uniform cross section to permit the below described piston 40 to be moved along it.
- the tube need not have a uniform cross section.
- the vessel 12 is filled with a standard quench bath selected for solidifying the respective liquid polymer solution.
- a standard quench bath selected for solidifying the respective liquid polymer solution.
- the quench bath might comprise methanol and water, (see Marinaccio and Knight) .
- the point 36 on the surface of roll 34 at which the fiber first contacts the redirecting guide roll 34 is preferably vertically directly beneath the below described exit 52 from the spinneret, so that the fiber extruded through the spinneret exit moves vertically through the extension tube, and not at an incline, which might adversely affect the uniformity of its hollow cross section.
- a tube sealing piston 40 which remains fixed in position during the extrusion of the dope and the passage of the fiber through the quench bath liquid filled vertical extension tube.
- a liquid polymer solution extruding die or spinneret 50 is sealingly supported in the piston and is connected to a supply of dope (not shown) which is to be extruded through the die.
- the spinneret has an outlet exit 52 and the spinneret conventionally extrudes the dope into the thin, hollow, fiber 60 which exits vertically downward through the outlet 52.
- the vertical extension tube is filled with the quench bath liquid all the way up to the exit 52 and the underside of the piston 40. Thus, the entire vertically downward path of travel of the fiber 60 is through the quench bath liquid.
- the height of the extension tube 20 is selected so that by the time the fiber 60 has moved into contact at 36 with the redirecting guide roll 34, the fiber is substantially solidified, and the redirection of the fiber around the guide roll does not undesirably alter the cross section of the fiber.
- the quench bath liquid be drawn up in the tube 20 sufficiently to cover the outlet 52 from the spinneret 50, for maximizing the length of the path of the fibers 60 through the quench bath and making the preferred type microporous hollow fibers. If the level of the quench bath is slightly lower, this will still not interfere with proper operation of this invention, although different type fibers may be produced.
- the bath liquid 30 is brought up to the outlet 52 from the spinneret by creating a vacuum in the tube 20 which draws the bath liquid up through the vertical tube 20 to the outlet 52.
- One way of accomplishing this is to evacuate the tube 20 through suction line 42 that passes through the piston 40 and is suctioned through pump 44.
- An appropriate valve such as a float valve, would prevent the liquid in the tube 20 from being sucked out.
- FIG. 1 Another technique for filling the vertical tube 20 is illustrated by a comparison of Figs. 1 and 2.
- the piston 40 With the -spinneret 0 installed, is at the bottom of the tube, with the exit 52 below the top 28 of the liquid bath (Fig. 2).
- the piston and spinneret are drawn to the top of the tube, e.g. by a drive mechanism fixed at one end of the piston. Since the piston is sealed on the wall of the tube and the wall of the tube 20 has a substantially constant cross section over its height, raising of the piston draws a vacuum in the tube beneath the piston and that vacuum is filled by bath liquid drawn out of the vessel 12.
- This method also has the advantage of being easier to start up, i.e., the fiber extrusion process can be established while the spinneret is in the lower position, where it is accessible to an operator, should there be an upset in the start-up operation.
- the ⁇ piston/spinneret can be drawn to the top of the extension tube from which fiber production is conducted. It may additionally be necessary to later use the vacuum drawing pump 44 and tube 42 to maintain the vacuum to maintain the liquid level in tube 20, as air leakage past the piston may occur and gas may eventually partially fill the tube 20.
- the quench bath liquid in the vertical tube, especially near the spinneret may eventually develop excess concentration of substances, e.g.
- a separate supply of quench bath liquid may be drawn from the tank 12 and pumped out through a porous sparger 64 located at the top of the tube and supported from the piston 40. This delivers a constant supply of fresh quench fluid which avoids agitating the liquid in the tube and minimizes the concentration of undesirable substances therein.
Abstract
A quench bath apparatus (12) for quenching and solidifying an extruded hollow porous fiber (60) of a liquid polymer solution in a chemical quenching solution (30), includes a shallow quench bath (12) of a length for the generally horizontal part of the extruded fiber (20) with its lower end beneath the surface (28) of the bath liquid (30) holds a spinneret (50) through which the fiber is extruded. The spinneret (50) is sealed in the tube above the height of the liquid in the shallow bath (12). A vacuum drawn in the tube (20) raises the liquid (30) up to the spinneret (50). Also included is a method for using the bath (12).
Description
HOLLOW FIBER VERTICAL QUENCH BATH
BACKGROUND OF THE INVENTION
The present invention relates to the manufacture of hollow porous fibers produced from a liquid polymer solution, and particularly to the quenching of those fibers in a quench bath following their extrusion.
Quench baths are known, as in U.S. Patent
3,199,148 to Koppehele. Extruding of polymer filaments is known, for example, from U.S. Patent 3,0894,384 to Denyes et al. Fiber extrusions are also known from
U.S. Patent 4,154,856 to Akin.
The production of hollow porous fibers, i.e., microporous, and in particular skinless nylon microporous filter fibers, is also well known. See, for example, U.S. Patent 3,876,738 to Marinaccio and Knight and U.S. Patent 4,604,208 to Chu et al.. the entire disclosures of which are incorporated herein by reference.
The production of hollow porous fibers involves extruding a hollow tube of liquid polymer solution, referred to as dope, into a chemical quenching solution, which causes the hollow porous fiber structure to form. During the extrusion, the dope emerging from the extrusion die, referred to as a spinneret, is essentially still in liquid form. It gradually solidifies over time while exposed to the chemical quenching solution held in a quench bath.
If a nascent, not yet solid, hollow fiber is bent or otherwise distorted while it is still predominantly in its liquid form, the cross section of the fiber will become permanently distorted and it will no longer have the concentric circular inner diameter and outer diameter cross section which it had as it was
emerging from the spinneret.
It is desired to maintain a concentric, circular cross section for the hollow fiber. It is known that one way for achieving that objective is to design the chemical quench bath to maximize the vertical distance directly beneath the spinneret through which the fiber dan descend. This provides the fiber with the longest possible time to form and solidify, before- the fiber is finally made to change direction by being led around a reel, roll or other guide and thereafter exit the quench bath horizontally. Obviously, a very deep, or tall quench bath is desired, especially in making large diameter fibers, that is those having an outer diameter of 30 mils or more. Very deep baths have practical problems, however. These include large bath volume and relative difficulty in gaining access to the bottom area of the bath for maintenance or to retrieve items that may have fallen into the bath. The need for large bath volume arises because once the fiber is redirected, e.g. around guides, it moves over a generally horizontal path to the bath exit and the deep bath must also be wide enough to provide the horizontal path.
SUMMARY OF THE INVENTION
Accordingly, it is the primary object of the present invention to obtain the benefits of a deep quench bath during the manufacture of hollow porous fibers while retaining the benefits of a relatively shallow main quench tank. Therefore, it is another object of the invention to provide a deep quench bath without having a large bath volume and avoiding difficulty in obtaining access to the lower bath areas.
The present invention provides a hollow fiber vertical quench bath having a relatively shallow main quench bath tank which communicates directly with a tall, thin, vertical extension tube that is filled with the bath liquid and that provides the needed vertical
quench bath beneath the spinneret. The hollow fiber extruded from the spinneret passes vertically down through the thin, elongate vertical extension tube where it is quenched by the bath liquid and gradually solidifies. Beneath the tube and in the main quench bath tank is positioned a guide roll or other means for changing the direction of the fiber. Then the redirected fiber moves generally horizontally away from beneath the vertical extension tube and through the shallow quench bath to the fiber exit. Thus, the invention provides the dual benefit of a tall or deep quench bath for the vertical portion of the fiber travel path and a wide, shallow quench bath for the horizontal portion of its travel. The vertical extension tube, supported above the shallow quench bath, has a lower end which is beneath the surface of the shallow quench bath. The spinneret is held at the top of the vertical extension tube, and the vertical extension tube is sealed around the spinneret. For example, the spinneret may be disposed in a piston which is sealed at the top of the tube. A vacuum is drawn in the vertical extension tube, e.g. by starting with the spinneret holding piston at the bottom of the vertical tube and drawing the sealed piston up the vertical tube or by starting with the piston sealed at the top of the tube and drawing a vacuum in the tube. The level of liquid in the vertical tube is raised preferably up to the exit from the spinneret so that the dope moves through the chemical quenching solution over the maximum vertical path. Also, for some dope systems, it is desirable not to expose the dope to an atmosphere other than that of the liquid quench solution.
There are benefits of this arrangement. The vertical distance between the spinneret and the fiber guide roll around which the fiber is redirected is maximized, assuring that the fiber ultimately has the most circular cross section possible. The quench
solution in the extension tube is relatively quiescent, because the cross section of that tube is smaller. This is important to preservation of the fiber due to the low physical strength of the nascent fiber, especially at the top of the tube when the fiber is in its most liquid state. One particular benefit is that the bath liquid in the shallow, main quench tank can be agitated to prevent stratification in that tank. Agitation is possible because the agitation in the main tank does not travel through the narrow extension tube and because the extension tube protects the fiber where it is most delicate and weak.
The quench fluid in the extension tube might build up an excessive concentration of solvent for the polymer and/or exhausted solvent. Optionally, therefore, it may be necessary to provide a quiescent supply of fresh quench fluid near the top of the extension tube where the spinneret is positioned during the fiber spinning. The supply may be through a porous sparger at the top of the tube, for example.
Other objects and features of the present invention will become apparent from the following description of preferred embodiments of the invention considered in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a schematic cross sectional view of a fiber spinning apparatus and quench bath according to the present invention with the fiber spinning apparatus and quench bath in the operational position.
Fig. 2 is the same view as Fig. 1, before fiber spinning according to the invention begins and illustrating the features of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A quench bath according to the present invention is used for hardening hollow porous fibers
• which are extruded in a hollow tube of liquid polymer solution, called a dope. Such extrudable polymer solutions are well known in the art and include, for example, those described in U.S. Patents 3,876,738 to Marinaccio and Knight, 4,604,208 to Chu et al, as well as U.S. Patent 4,340,479 to Pall. the entire disclosures of which are incorporated herein by reference.
The quench bath is contained in a relatively larger cross section main tank or vessel 12, which has a relatively long length in the direction along which the fiber is drawn generally horizontally, but which could be considerably narrower in the width direction, having to be wide enough to permit passage of the fiber and to permit access into the quench bath vessel for cleaning and to provide space for other objects, such as a guide roll, described below, which must be placed within the vessel 12. The vessel 12 is generally unpressurized, and is illustrated as being open-topped, although that is not required. The vessel has an outlet opening 14 in its side through which the by then hardened, solidified fiber is drawn out of the bath vessel 12 to be received on a storage roll 16, for example. Toward one end 18 of the vessel 12 along the length dimension, there is supported a vertical extension tube 20 which is considerably narrower in its width along the length dimension of the vessel 12 than is the length of the vessel. The tube 20 is preferably also of narrower width than the vessel 12, i.e. of much smaller cross-section than the vessel 12. The vertical extension tube need merely be of a cross section sufficiently larger than the fiber that moves through it, that the liquid in the vertical extension tube can adequately quench the fiber and cause it to solidify, by acting upon it. If the tube were too narrow, there would not be sufficient circulation around the just extruded fiber and quench chemicals would be too
rapidly exhausted and/or contaminated, e.g. with polymer solvent. For example, excess formic acid solvent for nylon polymer would develop in the liquid in the tube, see the aforementioned U.S. Patent 3,876,738 to Marinaccio and Kniσht. The narrowness of the cross section of the extension tube- not only permits a smaller amount of quench liquid to be used for forming a fiber, but it also dampens any agitation of the fluid in the tube, protecting the nascent fiber, particularly just after the fiber has been extruded and it is in a liquid state and weak.
The tube is supported at 24 in the vessel at a height such that the bottom 26 of the tube 20 would normally be below the surface 28 of the liquid 30 in the vessel 12. For example, a vertical extension tube, between the exit from the spinneret and the top of the liquid bath in the vessel 12, might have a height of 60 in. and might have a cross sectional area of 7-14 sq. in. The tube 20 typically has a uniform cross section to permit the below described piston 40 to be moved along it. However, in an alternate embodiment with the piston normally sealed in upraised position, the tube need not have a uniform cross section.
The vessel 12 is filled with a standard quench bath selected for solidifying the respective liquid polymer solution. For example, for a polymer solution of nylon, formic acid and methanol, the quench bath might comprise methanol and water, (see Marinaccio and Knight) . There is disposed within the vessel 12 a supported guide roll 34, which is disposed beneath the tube 20. The point 36 on the surface of roll 34 at which the fiber first contacts the redirecting guide roll 34 is preferably vertically directly beneath the below described exit 52 from the spinneret, so that the fiber extruded through the spinneret exit moves vertically through the extension tube, and not at an incline, which might adversely affect the uniformity of
its hollow cross section.
As shown in Fig. 1, there is sealed at the top of the tube 20 a tube sealing piston 40 which remains fixed in position during the extrusion of the dope and the passage of the fiber through the quench bath liquid filled vertical extension tube.
A liquid polymer solution extruding die or spinneret 50 is sealingly supported in the piston and is connected to a supply of dope (not shown) which is to be extruded through the die. The spinneret has an outlet exit 52 and the spinneret conventionally extrudes the dope into the thin, hollow, fiber 60 which exits vertically downward through the outlet 52. Preferably, the vertical extension tube is filled with the quench bath liquid all the way up to the exit 52 and the underside of the piston 40. Thus, the entire vertically downward path of travel of the fiber 60 is through the quench bath liquid. The height of the extension tube 20 is selected so that by the time the fiber 60 has moved into contact at 36 with the redirecting guide roll 34, the fiber is substantially solidified, and the redirection of the fiber around the guide roll does not undesirably alter the cross section of the fiber. Once the fiber has passed the roll 34, its run 62 passes through the shallow quench bath 30 generally horizontally. The pathway of the run 62 of the fiber is inclined gradually upwardly, so that the fiber emerges through the top 28 of the liquid bath just before exiting through the exit 14 from the vessel 12. The length of the vessel 12 assures that the fiber has been solidified before it exits through the exit 14.
It is preferred that the quench bath liquid be drawn up in the tube 20 sufficiently to cover the outlet 52 from the spinneret 50, for maximizing the length of the path of the fibers 60 through the quench bath and making the preferred type microporous hollow fibers. If the level of the quench bath is slightly
lower, this will still not interfere with proper operation of this invention, although different type fibers may be produced.
The bath liquid 30 is brought up to the outlet 52 from the spinneret by creating a vacuum in the tube 20 which draws the bath liquid up through the vertical tube 20 to the outlet 52. One way of accomplishing this is to evacuate the tube 20 through suction line 42 that passes through the piston 40 and is suctioned through pump 44. An appropriate valve, such as a float valve, would prevent the liquid in the tube 20 from being sucked out.
Another technique for filling the vertical tube 20 is illustrated by a comparison of Figs. 1 and 2. Initially, before the hollow fibers are extruded, the piston 40, with the -spinneret 0 installed, is at the bottom of the tube, with the exit 52 below the top 28 of the liquid bath (Fig. 2). The piston and spinneret are drawn to the top of the tube, e.g. by a drive mechanism fixed at one end of the piston. Since the piston is sealed on the wall of the tube and the wall of the tube 20 has a substantially constant cross section over its height, raising of the piston draws a vacuum in the tube beneath the piston and that vacuum is filled by bath liquid drawn out of the vessel 12. This method also has the advantage of being easier to start up, i.e., the fiber extrusion process can be established while the spinneret is in the lower position, where it is accessible to an operator, should there be an upset in the start-up operation. Once the fiber extrusion process has been established, the ■piston/spinneret can be drawn to the top of the extension tube from which fiber production is conducted. It may additionally be necessary to later use the vacuum drawing pump 44 and tube 42 to maintain the vacuum to maintain the liquid level in tube 20, as air leakage past the piston may occur and gas may eventually partially fill the tube 20.
The quench bath liquid in the vertical tube, especially near the spinneret, may eventually develop excess concentration of substances, e.g. solvents, resulting from the extrusion of the polymer solvent into the quench bath, e.g. excess formic acid concentration may develop. A separate supply of quench bath liquid may be drawn from the tank 12 and pumped out through a porous sparger 64 located at the top of the tube and supported from the piston 40. This delivers a constant supply of fresh quench fluid which avoids agitating the liquid in the tube and minimizes the concentration of undesirable substances therein.
There has just been described a quench bath for an extruded polymer fiber which is afforded an extended vertical path of travel through the quench bath by passage through an elongate vertical extension tube which is filled with the quench bath liquid and which communicates into the larger cross section, shallow quench bath through which the fiber has its redirected, generally horizontal run.
Although the present invention has been described in connection with a plurality of preferred embodiments thereof, many other variations and modifications will now become apparent to those skilled in the art. It is preferred, therefore, that the present invention be limited not by the specific disclosure herein, but only by the appended claims.
Claims
1. A quench bath for an extruded fiber, comprising a bath vessel having a first horizontal length dimension for a generally horizontal run of the fiber extruded and for containing a quench bath liquid up to a predetermined level in the vessel; an extension tube supported at the vessel and extending above the height of the liquid in the vessel; the tube having a lower open end supported at a height in the vessel to be below the level of quench bath liquid that is disposed in the vessel, the tube having a second horizontal length dimension shorter than the first length dimension of the vessel; a spinneret for extruding a fiber from a liquid polymer solution and having an outlet exit for an extruded fiber, the spinneret being supported in the tube with the outlet a distance above the liquid level in the bath when the bath is filled, for a fiber extruded through the outlet to pass vertically through the extension tube, and means sealing the spinneret in the tube, for sealing the tube which opens into the liquid bath; and means in the vessel for redirecting the direction of the fiber from the generally vertical direction in which the fiber has traveled through the extension tube to a more generally horizontal direction in which the fiber travels through the vessel.
2. The quench bath of Claim 1, further comprising means for drawing a vacuum in the extension tube for drawing liquid from the bath into the extension tube.
3. The quench bath of Claim 1, wherein the bath has a relatively larger horizontal cross-section, and the tube has a relatively smaller horizontal cross- section.
4. The quench bath of Claim 3, wherein the bath vessel has ends along its horizontal dimension, the tube is disposed more toward one of the horizontal ends and the redirecting means in the vessel redirecting the fiber in the vessel toward the other horizontal end of the vessel.
5. The quench bath of Claim 1, wherein the fiber redirecting means is disposed vertically directly beneath the spinneret outlet such that a fiber extruded through the spinneret outlet will travel vertically down to the redirecting means and contact the redirecting means at a location vertically directly beneath the spinneret exit.
6. The quench bath of Claim 5, wherein the fiber redirecting means comprises a roll and the fiber is redirected by passing partially around the circumference of the roll.
7. The quench bath of Claim 1, wherein the means sealing the spinneret in the tube comprises a piston sealingly received in the tube and the spinneret is supported in the piston, the spinneret outlet opening outside the piston in. the extension tube.
8. The quench bath of Claim 7, wherein the piston is vertically movable along the tube for being moved up along the tube for drawing liquid into the tube behind the piston moving up.
9. The quench bath of Claim 8, further comprising means for drawing a vacuum in the extension tube for drawing liquid from the bath into the extension tube.
10. The quench bath of claim 1, wherein the tube is oriented vertically. l
11. A method of manufacturing hollow porous fibers from liquid polymer solution comprising filling a vessel with a chemical quenching liquid which is capable of solidifying and forming pores in an extruded liquid polymer fiber; in a tube extending vertically up from the top of the liquid in the vessel, disposing a spinneret having a spinneret outlet up above the top of the liquid, raising the level of the liquid in the tube up toward the spinneret exit; extruding liquid polymer solution out through the spinneret outlet and generally vertically down through the tube and through the liquid in the tube and into the vessel; in the vessel, redirecting the fiber generally more horizontally through the vessel.
12. The method of Claim 11, wherein the raising of the level of the liquid in the extension tube comprises drawing a vacuum in the tube for drawing liquid from the vessel into the tube.
13. The method of Claim 12, wherein the vacuum is drawn in the tube by sealing the spinneret in the tube and then moving the sealed spinneret up through the tube, for drawing a vacuum behind the rising spinneret for drawing the liquid into the tube.
14. A method of manufacturing a hollow porous fiber from a liquid polymer solution, comprising the steps of:
(a) placing into a vessel a chemical quenching liquid which is capable of solidifying and forming pores in an extruded liquid polymer fiber;
(b) placing a spinneret having a spinneret outlet in a tube having a top and a bottom opening, which tube is partially submerged in and extends vertically from said chemical quenching liquid such that the spinneret outlet is proximate said chemical quenching liquid;
(c) sealing the spinneret in the tube;
(d) moving the sealed spinneret up through the tube so as to draw a vacuum behind the rising spinneret and hence, draw the quenching liquid into the tube;
(e) extruding liquid polymer solution out through the spinneret outlet and down through the tube and into the vessel; and
(f) redirecting the fiber in the vessel into a generally horizontal direction through the vessel.
15. A method of manufacturing a hollow nylon, microporous filter fiber from a liquid nylon polymer solution, comprising the steps of:
(a) placing into a vessel a chemical quenching liquid which is capable of solidifying and forming pores in an extruded liquid nylon polymer fiber;
(b) placing a spinneret having a spinneret outlet in a tube having a top and a bottom opening, which tube is partially submerged in and extends vertically from said chemical quenching liquid such that the spinneret outlet is proximate said chemical quenching liquid;
(c) sealing the spinneret in the tube;
(d) moving the sealed spinneret up through the tube so as to draw a vacuum behind the rising spinneret and hence, draw the quenching liquid into the tube;
(e) extruding liquid nylon polymer solution out through the spinneret outlet and down through the tube and into the vessels; and
(f) redirecting the fiber in the vessel into a generally horizontal direction through the vessel.
16. A method of manufacturing according to Claim 15 wherein the nylon microporous membrane is skinless.
17. A method of manufacturing according to Claim
14, wherein the spinneret is in contact with the chemical quenching liquid during extruding step (e) .
18. A method of manufacturing according to Claim
15, wherein the spinneret is in contact with the chemical quenching liquid during extruding step (e) .
19. A method of manufacturing according to Claim
16, wherein the spinneret is in contact with the chemical quenching liquid during extruding step (e) .
20. A method of manufacturing according to Claim
14, wherein steps (d) and (e) are performed in reverse sequence.
21. A method of manufacturing according to Claim
15, wherein steps (d) and (e) are performed in reverse sequence.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/US1988/004371 WO1990006801A1 (en) | 1988-12-22 | 1988-12-22 | Hollow fiber vertical quench bath |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US1988/004371 WO1990006801A1 (en) | 1988-12-22 | 1988-12-22 | Hollow fiber vertical quench bath |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1990006801A1 true WO1990006801A1 (en) | 1990-06-28 |
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ID=22209036
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1988/004371 WO1990006801A1 (en) | 1988-12-22 | 1988-12-22 | Hollow fiber vertical quench bath |
Country Status (1)
Country | Link |
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WO (1) | WO1990006801A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0526857A1 (en) * | 1991-08-01 | 1993-02-10 | Praxair Technology, Inc. | Hollow fiber membranes |
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US3050775A (en) * | 1959-04-22 | 1962-08-28 | Onderzoekings Inst Res | Spinning of cellulose film |
US3084384A (en) * | 1959-07-24 | 1963-04-09 | Celanese Corp | Wet spinning apparatus and process |
US3154609A (en) * | 1962-03-29 | 1964-10-27 | Celanese Corp | Production of crimped filaments |
US3199148A (en) * | 1962-04-20 | 1965-08-10 | Avisun Corp | Film quenching apparatus |
US3412191A (en) * | 1964-12-18 | 1968-11-19 | Mitsubishi Rayon Co | Method for producing artificial fibers |
US3842151A (en) * | 1971-12-22 | 1974-10-15 | Ceskoslovenska Akademie Ved | Method for preparing fibers from polymer solutions |
US3876738A (en) * | 1973-07-18 | 1975-04-08 | Amf Inc | Process for producing microporous films and products |
US4154856A (en) * | 1978-03-20 | 1979-05-15 | Standard Oil Company (Indiana) | Method for stretching a coagulable extrudate |
US4321230A (en) * | 1980-06-05 | 1982-03-23 | Mobil Oil Corporation | Process for recovering film from pressurized extrusion zone |
US4323627A (en) * | 1975-12-29 | 1982-04-06 | Nippon Zeon Co., Ltd. | Hollow fiber and method of manufacturing the same |
US4340479A (en) * | 1978-05-15 | 1982-07-20 | Pall Corporation | Process for preparing hydrophilic polyamide membrane filter media and product |
US4604208A (en) * | 1983-12-29 | 1986-08-05 | Chaokang Chu | Liquid filtration using an anionic microporous membrane |
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Patent Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3050775A (en) * | 1959-04-22 | 1962-08-28 | Onderzoekings Inst Res | Spinning of cellulose film |
US3084384A (en) * | 1959-07-24 | 1963-04-09 | Celanese Corp | Wet spinning apparatus and process |
US3154609A (en) * | 1962-03-29 | 1964-10-27 | Celanese Corp | Production of crimped filaments |
US3199148A (en) * | 1962-04-20 | 1965-08-10 | Avisun Corp | Film quenching apparatus |
US3412191A (en) * | 1964-12-18 | 1968-11-19 | Mitsubishi Rayon Co | Method for producing artificial fibers |
US3842151A (en) * | 1971-12-22 | 1974-10-15 | Ceskoslovenska Akademie Ved | Method for preparing fibers from polymer solutions |
US3876738A (en) * | 1973-07-18 | 1975-04-08 | Amf Inc | Process for producing microporous films and products |
US4323627A (en) * | 1975-12-29 | 1982-04-06 | Nippon Zeon Co., Ltd. | Hollow fiber and method of manufacturing the same |
US4154856A (en) * | 1978-03-20 | 1979-05-15 | Standard Oil Company (Indiana) | Method for stretching a coagulable extrudate |
US4340479A (en) * | 1978-05-15 | 1982-07-20 | Pall Corporation | Process for preparing hydrophilic polyamide membrane filter media and product |
US4340479B1 (en) * | 1978-05-15 | 1996-08-27 | Pall Corp | Process for preparing hydrophilic polyamide membrane filter media and product |
US4321230A (en) * | 1980-06-05 | 1982-03-23 | Mobil Oil Corporation | Process for recovering film from pressurized extrusion zone |
US4604208A (en) * | 1983-12-29 | 1986-08-05 | Chaokang Chu | Liquid filtration using an anionic microporous membrane |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0526857A1 (en) * | 1991-08-01 | 1993-02-10 | Praxair Technology, Inc. | Hollow fiber membranes |
CN1034475C (en) * | 1991-08-01 | 1997-04-09 | 普拉塞尔技术有限公司 | Hollow fiber membranes |
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