TW487745B - High speed melt spinning of fluoropolymer fibers - Google Patents

Abstract

The processes and apparatus of the present invention concerns melt spinning high viscosity fluoropolymers into single filaments or multi-filament yarns at high spinning speeds. A process for melt spinning a composition comprising a highly fluorinated thermoplastic polymer or a blend of such polymers, comprising the steps of: melting a composition comprising a highly fluorinated thermoplastic polymer or a blend of such polymers to form a molten fluoropolymer composition; conveying said molten fluoropolymer composition under pressure to an extrusion die of an apparatus for melt spinning; and extruding the molten fluoropolymer composition through the extrusion die to form filaments, said die being at a temperature of at least 450 DEG C, at a shear rate of at least 100 sec<SP>-1</SP>, at a spinning speed of at least 500 m/min.

Description

487745

V. Description of the invention (1) Background of the invention The device is related to silk yarn. The economic incentives of thermoplastics. In the face of melt-spinning, bulk cracking occurs, and melt viscosity is reduced, including the degradation of tetrafluoropolymer in solution. The problem of melt spinning of fluoropolymer polymers at high spin and spinning speeds has driven me to these high-value polymers. One problem is the critical shear, ; t &gt; the rate of meso-cutting is dependent on the way the melt is focused on increasing the viscosity of the thermoplastic copolymer based on melt ethyl acetate, which can achieve any significant reduction

The hair is melt-spun into four knowledge. However, at a higher shear rate, the temperature of the surface coarse viscosity transmitter is lower than that of the single-filament single-filament vinyl fluoride, and there is a roughness under the rate of rotation. Increase and increase. However, if it is polymerized, it will be difficult to melt the melted fibers due to the large size of the fibers. Therefore, the fibers with thermal f-tetrafluoroethylene (pTFE) homopolymer are also high-value fibers. You = t because of its chemical and mechanical properties, such as low coefficient of friction, thermal stability and chemical properties. However, processing with melt spinning has proven confusing. Since PTFE homopolymer fibers are conventionally formed by a spinning spinning method containing many small and complex equipment, there is a large economic incentive to find a method for melt spinning these fibers.

The problem of spinning fibers from south viscosity polymer melts has previously been directed to polyesters. In US Pat. No. 3,437,7 25 t, the spinneret assembly is described as having a dead plate, a heating plate and a lower plate, and a partition providing an air space between the upper plate and the heating plate. For each filament to be spun, a hollow insert is placed on the upper plate and extends to the bottom of the lower plate. The molten polymer is fed into the insert &apos; for spinning through the capillary. Electric heaters supply heat to maintain

Page 4 487745 V. Description of the invention (2) The temperature of the lower part of the plate, heating plate and insert is higher than the temperature of the supplied molten polymer by at least 60 ° C. The heated capillary temperatures listed in the examples ranging from 290 to 430 C are for spinning polyester. No mention is made of any fluoropolymer or the temperature required to melt-spin the fluoropolymer at high spin speeds. SUMMARY OF THE INVENTION The present invention provides a method for melt-spinning a composition comprising a highly fluorinated thermoplastic polymer or a blend of such polymers, comprising the steps of: The composition of the blend is melted to form a molten fluoropolymer composition; the molten fluoropolymer composition is conveyed under pressure to an extrusion die of a melt spinning device; and the molten fluoropolymer composition is extruded through extrusion A mold to form molten filaments, the mold is at a temperature of at least 450 ° C, a shear speed of at least 100 sec-1 and a spinning speed of at least 500 m / min. The present invention also provides a method for melt-spinning a composition comprising a polytetrafluoroethylene homopolymer, comprising the steps of: melting the composition comprising a polytetrafluoroethylene homopolymer to form a molten polytetrafluoroethylene composition; The molten polytetrafluoroethylene composition is conveyed under pressure to an extrusion die of a melt spinning device; and the molten polytetrafluoroethylene composition is extruded through the extrusion die to form molten filaments. The present invention further provides a device for melt-spun fibers including a spinneret assembly, which includes a filtering device; a spinneret; and an extended transfer line, the transfer line is arranged between the filtering device and the spinneret; the lengthening The heating device of the transfer line; the heating device of the spinneret; and the extended annealing device arranged below the spinneret assembly. Brief description of the drawings

Partial sectional view. A specific part of the melt-spinning device of the silk head is shown in Fig. 1. Fig. 1 is a cross-sectional view of a conventional melt-spinning device. Fig. 3 is a sectional view of a shortened and extended spinneret. Fig. 4 is a sectional view of a specific example of shortening and lengthening according to the present invention (partially equipped with a U-spinning device and a heating device arranged on the outer surface): Placed in the central cavity of the spinneret and

An example of the decomposition profile of a specific example of the second embodiment of the transfer line for the transfer of the transfer line is shown; its characteristics. The extension transfer line is arranged between the combined filter and the warp-section head fixing plate of the melt spinning device of FIG. 5. ΓΛ 本 钟 发: Month: An exploded section of a specific example of a spinning device "; another specific example of the extended transfer line and spinneret shown in it. FIG. 8 is a combined sectional view of the melt-spinning device of FIG. 7. Fig. 9 is a schematic view of a specific example of the melt-spinning device of the present invention. The drawing is a cross-section of a specific example of a cooler of the present invention. Fig. 10B is an enlarged view of a portion of Fig. 10A.

Fig. 11 is a graph of shear rate (l "ec) vs. SSF of the composition of K Example 1 at 50 °; the dark triangle represents the spinning stretch factor (SSF) at the time of initial filament break and the hollow triangle is Represents the SSF at the last filament break. Included is one of denier / toughness / speed / gpm. Figure 1 2 is a curve that proves that the temperature of the first filament breaks at a constant shear rate. The positive influence exerted by SSF. The circle represents SSF at 4200c; the square represents SSF at 4 60 t; and the triangle represents at 50 () t

Page 6 487745 V. SSF of invention description (4) (see also example 丨). Figure 1 3 is the curve of the flux versus the curing distance from the spinneret and without the use of a cooler; using FEP-5100, 30-mil / 30-filament spinneret, 3-inch straight from 4 to 1 hour The temperature of the long cooler and spinneret is 3800 ° C (triangle), 4300 ° C (square) and 480 ° C (circle). The hollow symbol indicates that the cooler is not needed, and the dark symbol indicates Use a Xu cooler. Figure 14 shows the distance (inch) from the spinneret to the temperature of the yarn with a cooler (dark symbol) and without a cooler (open symbol); fflFEp — 51〇〇, 39 · 4- dense / 30 a filament spinneret with a spinneret temperature of 48 (pc, 45 · 4

gpm / ~ 0 pph 'where the square represents the yarn temperature at a spinning speed of 400 mpm', the circle represents the yarn temperature at 500 mpm, and the triangle represents the yarn temperature at 700 mpm. Figure ^ is a plot of the length of the cooler (inch) versus the initial filament breaking speed (mpm). The following was used: FEP-510 () fluoropolymer, 30-mil / 30-fibre spinneret, spinneret temperature of 480 ° C and 448 g / min (gpm). Figure 16 is the curve of the temperature versus the initial filament breaking speed (mpm) of Example 23 =, /, dark circles represent samples of the present invention, and squares represent comparative samples. Say in detail!

The method of the present invention provides the benefits of high temperature spin spinning while avoiding its disadvantages: Character: In the method of the invention 'comprising a highly fluorinated thermoplastic polymer or this 〇 «-ying, the composition of the criminal can be exposed above the polymer degradation temperature: : Ming :: The time can be long enough to cause the melt viscosity to decrease and insufficient to cause significant polymer degradation to occur. When melt spinning, melt the composition

// HO 5. Description of the invention (5) It uses a melt-spinning high front + t garment to place an extrusion die, for example, the capillary tube encounters the same shear rate. In the method of 欢 π 丄 &amp; ^ + invented by Taihuanren, it is at this point that the molten polyσ can be added to the high temperature / L &gt; 糸 Α ^ ... above the degradation temperature of the eight gasification polymer temperature. Because of the high flow rate that can be achieved due to the low temperature and the low temperature, the residence time of the composition in the extrusion die f is kept to a minimum. ^ This' The present invention provides the first melt-spinning method comprising a highly fluorinated thermoplastic polymerization step 2 ^ The method of the composition of the "sweep" of "PolyA" which includes the following steps: The polymer or blends of these polymers $ and 5 are dissolved to form a melted fluoropolymer composition; the melted fluoropoly: composition is pressurized to the extrusion die of the spinning device; and the melt is melted Fluoride composition is extruded through an extrusion die to form molten filaments, the die is at a temperature of at least 450 ° C, a shear rate of at least 100se CT1, and a spinning speed of at least 50 0 m / min. Compositions comprising highly fluorinated thermoplastic polymers or blends of these polymers are melted during the melting step. The highly fluorinated thermoplastic polymers used in this first method include homopolymers other than polytetrafluoroethylene (PTFE), such as polyvinylidene fluoride (PVDF), and copolymers, such as tetrafluoroethylene (tj E) Copolymers prepared with comonomers including perfluoroolefins, such as perfluorovinyl alkyl compounds, perfluoroalkyl vinyl ethers, or blends of these polymers. 1 Copolymer π, as used in the present invention, is intended to encompass a single polymer containing two or more comonomers. A representative perfluoroethylene alkyl compound is hexafluoropropylene. Typical perfluoroalkyl vinyl ethers are perfluoromethyl vinyl ether (PMVE), perfluoroethyl vinyl ether (PEVE) and perfluoropropyl vinyl scale (PPVE). Preferred Nandu fluorinated polymers are from tetrafluoroethylene and perfluoro

Page 8

487745 V. Description of the invention (6) Copolymer prepared from pit-based vinyl ether, and copolymer prepared from perfluoroethylene and hexafluoropropylene. The best copolymer is 1-20 mole% perfluorovinyl alkyl comonomer, preferably 3-10 mole% hexafluoropropylene or 3-10 mole% hexafluoropropylene with 0.2- 2 mole% PEVE or PPVE TFE, and 0.5-10 mole% perfluoroalkyl vinyl ether, including 0.5-3 mole% ρρνΕ or TFE copolymer of PEVE. Also suitable for practicing the present invention are blends of highly fluorinated thermoplastic polymers, including blends of TF E copolymers. Fluoropolymers suitable for the practice of the present invention preferably have a melt flow rate (MF R) of about 1 to about 50 grams / 10 minutes, such as D33 07, D1238, or other counterparts that can be used for other highly fluorinated thermoplastic polymers. Tested at 372. Compositions comprising highly fluorinated thermoplastic polymers or blends of these polymers may further include additives. These additives may include, for example, pigments and fillers. In this method, the composition discussed above comprising a highly fluorinated polymer or a blend of these polymers is melted to form a molten fluoropolymer composition. Any method known in the art to provide a melt can be used. A representative method may include introducing the fluoropolymer composition into an extruder and heating it to a temperature sufficient to melt the composition, but below the degradation temperature of a highly fluorinated thermoplastic polymer or a blend of these materials. This temperature depends on the particular polymer used. Once the composition has become molten, it is conveyed under pressure to an extrusion die of a melt spinning device, such as a spinneret. The manner in which the composition is delivered to the extrusion die is well known in the art and includes having a ram or piston, single spiral or double

Page 9 487745 V. Description of the invention (7) Spiral device. In the method of the present invention, it is preferred to use melting and conveying melt% suitable for carrying out the present invention. The house extrusion machine is used to form monofilament or multifilament fiber products, respectively. Extrusion :: The tube and the spiral 'and the mold are preferably made of corrosion-resistant materials, including high nickel $ f corrosion-resistant steel alloys, such as Hastelloy C ~ 276 (Cab〇t Corporation, Kokomori ΙΝ ·). production. Many suitable extruders, including screw and piston, are known in the art and are commercially available. It can also include metering devices such as gear pumps to meter the melt between the spiral and the spinneret. * In the method of the present invention, the molten fluoropolymer composition is extruded through the holes of the extrusion die after being conveyed to the extrusion die, and the die is at a temperature of at least 450. (: Below, the shear rate is at least 100se (rl and the spinning speed is at least 5000m / min. The hole of the extrusion die can be any desired cross-sectional shape, and a circular cross-sectional opening i-shaped is more suitable It is found to be suitable for the circular cross section of the method of the present invention within the range of ^ · 5 main 4 · 0 ^ meters, but the practice of the present invention is not limited to violation of the fence. The length of the hole of the extrusion die of the present invention And diameter = it is better in the range of about ^ 1 to about 8 ·· 1. Although the hole type is not important, the right hole system is better configured with one or two concentric circles, and the single circle configuration is more suitable.洎 Figure 1 shows a part of the conventional melt-spinning device for plastic polymers. The spinneret = 10 ° is not the connector 1. It can be inserted into the two between the point line of the connector 1. The Kun heater in 9 is heated and attached to a device (not shown) for conveying and melting the fluoropolyurethane composition; it includes a melt filtering device 3, which is generally a filter and a piece 2 of the monument network; and Conventional spinneret 4 with panel 5 and panel 5 487745 V. Description of the invention (8) = arranged at one end of / sprayer 4 and the other of the spinneret 4 and the other of the spinneret 4 The distance is h. Zhu, ', and t heads 4 are arranged adjacent to the bottom surface 8 of the filter assembly 2 and are fixed to the connector 1 by the button nut 6 with the filter assembly. The spinneret assembly 10 is borrowed; The belt heater 7 around the nut 6 is used for heating. In Fig. 1, the spinneret T is generally heated by its conductive contact with the button nut 6. Only heating the spinneret is provided. There is no convenient method for Medium. Any panel 5, because the spinneret 4 is completely covered in the area of the buckle. Attempts of panel 5 will heat the spinneret assembly 10 and other regions 5 outside the panel 5 to a similar or slightly lower temperature. The spinneret assembly is prepared at a temperature of 10 ° C or more. This—improper heating to the degradation of the fluoropolymer composition, and in this case the undesired long-term exposure of the fluoropolymer composition to high temperatures will cause the The polymer is excessively degraded. Here, some fluorine double extrusion dies are heated to a temperature of at least 45 0 ° C. Above about 501. (: // For the composition composition, the extrusion dies can be heated to a temperature solution. It is possible to accompany the mold and other areas by reducing the temperature of the pile to these temperatures without lowering the fluoropolymer composition. The melt spinning device of the fluoropolymer composition is achieved by extruding the mold when it is extruded. When the molten fluoropolymer composition begins to decrease rapidly, the mold temperature of the two will cause the polymer melt viscosity to decrease. ; :: == mould, in order to avoid thermal degradation, a function of time is necessary, if, w: a, 4. Because degradation is not only temperature but also, the present invention, preferably, the residence time should be minimized. The area of the nozzle in the silk panel, that is, the extrusion die, for example, in the extrusion die, can be provided with; the highest temperature. Therefore, _ a lice bearing composition of the melt spinning device of its page 11 487745

Other areas remain thermally isolated. The 8 2 silk head or the part including the panel can be connected to other areas of the spinneret assembly :: heating. Provide high localized heating to a temperature of at least 45 °. Renzhi / 3 can be used to practice the present invention. These devices include coil heaters ^ a radio frequency 'conduction, induction or pairing; r two devices, such as induction heaters. Insulation, such as ceramic insulation, may be used to provide thermal insulation between the panel and other areas where the panel may be in contact with a fused polymer that may come into contact with the fluoropolymer composition. Spinning outside the extrusion die

Or, one or more cooling jackets are used in the spinneret assembly area to improve the thermal isolation of the mold.佾 Check 梹 —In order to facilitate the thermal isolation of the extrusion die, in a specific example of the present invention, only the distance h between the two ends of the conventional spinneret shown in FIG. 1 is increased to make the spinner face reverse / spinning The head body is isolated and has been found to be ideal. Increasing the distance in this way ^ 'shown by h' in FIG. 2 enables the spinneret panel and the remaining 4 parts of the spinneret assembly to be separately heated as a whole. Therefore, the spinneret panel of the present invention is separated from the bottom surface of the filter assembly by a distance h in one example, which is sufficient to separately heat the spinneret panel.

&gt; Figure 2 shows a spinneret assembly 20, which has an adapter 21 attached to a device (not shown) that dissolves and / or conveys the gaseous polymer composition; includes a screen 23 and a bottom surface 2 of 8 Filter assembly; extended spinneret 24 with panel 25, panel 25 is disposed at one end of spinneret 24, and h from spinneret 24 at the other end of bottom 28 of filter assembly 22, where h , &Gt; h and map! The other dimensions remain the same as in 2, enabling the panel 25 to protrude beyond the button nut 26. Since the panel 25 protrudes from the snap nut 2 6 in this way, the heating device 2 9 can be used to individually heat the surface

Page 12 487745 V. Description of the Invention The plate 25 is thus thermally separated from the rest of the spinneret assembly. The heating device 27, such as a belt or coil heater, is arranged around the nut 26. Another alternative specific example of the spinneret assembly that can be used in the present invention is shown in FIG. 3 as the spinneret assembly 30. In this specific example, the lower portion of the buckle nut 26 in FIG. 2 is reduced in size. For example, the buckle nut is thinner. Please refer to the buckle nut 36 in FIG. 3. Here, the length of the body of the lengthened spinneret 34 is shorter than that of the spinneret 2 4 in FIG. 2, but the spinneret 34 is still longer (compared to the spinneret 4 in FIG. 1) so as to extend beyond the button. Outside the nut 4 6, the panel 3 5 can be heated by means of the device 3 9 separately from the device 3 7 shown in the other region of the spinneret assembly for heating. Also shown are adapters 31, which are attached to a device (not shown) that melts and / or transports the fluoropolymer composition; the pass-through assembly 32, and the pass-through assembly 3 3 'and the guide groove 38. · · · 〆 In the above specific examples of the present invention, the molten composition delivered to the spinneret can be heated by a device arranged around the outer wall of the spinneret, and thus the temperature of the melt adjacent to /] and the wall of the hole Above the melt center. This temperature 1 is non-uniform. • &gt; The effect-the highest outside and cooling towards the melt center-the effect of bowing the filaments towards the center of the spinneret. It has been found that the bending angle of some fluoropolymer compositions is higher than 45 at high jet speeds. . The impact of this phenomenon is to reduce the continuity of the high-speed filament that can be achieved. In order to reduce any temperature gradient between the outermost and innermost parts of the polymer melt, a heating device can be provided in the small hole 48. For example, the cassette heater can be placed in the center of the elongated spinneret 44, as shown in the spinneret assembly 40 of Fig. 4. Also shown in Fig. 4 is an adapter 41, which is fixed to a device (not shown) for melting and / or transporting the fluoropolymer composition; a filter set

O: \ 62 \ 62592.PTD Page 13 487745 V. Description of the invention (11) Combination 4 2; Filter mounting plate 4 5 0 50 provided by the present invention is a fast groove 6 2 (equivalent to the head of Figure 3) A specific example of the volume of the panel 55 is also provided. By heating to install this, the middle 5 2 part below the temperature of the fluoropolymer composition of the method of the present invention can be equipped with a transfer line 58 in a guide groove 62 and a heating device 6 0 pre-added. The melting panel 5 of the composition composition is divided into a heating device 61 points and a filtering device 5 3 under the spinneret 5 4 can be removed 5 2. Also shown in Figures 7 and 8 of the polymer composition Transfer line 7 8 and can be placed as shown in Figures 5 and 6 4 3; nut 4 6; heating device 4 7 and 4 9; and further specific examples, shown in Figures 5 and 6 as hot melt of the spinneret The body passes through the narrow guide grooves 3 8) provided in the transfer line 58 and is directly sent to the spinneret in order to reduce the upstream. By reducing the volume, the residence time can be shortened. At this opportunity, the composition is still used in the guide groove 6 2 of the transfer line 5 8 and 60, and there is an intermediate temperature region. This may further include exposing the aeropolymer composition to a temperature from the melt to an extrusion die, such as a spinneret panel temperature. As shown, the transfer line 5 8 is heated adjacent to the filter assembly by a heating device 5 7 placed around the nut 5 6. The converted fluoropolymer composition can be heated to at least an intermediate temperature by the heating device 57 and / or, and this temperature can be in a temperature range from the fluoropolymerization temperature to a temperature lower than the temperature of the panel 55. In the system, it is shown that it is heated by being fixed on the spinneret sleeve 5 9, and the transfer line 5 8 is arranged on the filter assembly 5 2, and then the spinneret 5 4 is shown in the shape of a disk. For cleaning and replacement without removing the filter assembly adapter 51, which is fixed to a melting and / or transporting fluorine device (not shown). The invention of the spinneret assembly 70, this specific example allows to accommodate a larger diameter disc spinneret, which is relative to the example, such as the spinneret 74. Spinneret nut 7 9 will have

O: \ 62 \ 62592.PTD Page 14 487745

V. Description of the invention (12) The disc spinneret 74 with the panel 75 is fixed to the bottom of the surface 82 of the transfer line 78. The narrow internal flow grooves 83 in the transfer line 78 reduce the volume of the fluoropolymer composition and shorten its residence time at high temperatures to further reduce the chance of degradation. The transfer line 78 also provides a gradual rise to an intermediate temperature between the filter device 73 and the spinneret 74 by means of a separate heating device 80. At the same time, the transfer line shown provides more uniform and faster heat transfer. An additional advantage of this specific example is that the disc spinneret 7 4 can be replaced without removing the filter assembly, and the disc can be manufactured more easily. Also shown is an adapter 71, which is fixed to a device (not shown) that dissolves and / or transports the fluoropolymer composition; a plate 72 with a plurality of distribution slots to provide support for the filtering device 73; surrounded by a heating device 77 A button nut 76; a chamber 84 disposed between the filtering device 73 and the transfer line 78; and a panel 75. Xianxin The method of the present invention provides "self-melt lubricating extrusion, lubricated extrusion". The so-called "self-melt lubricating extrusion" means only the skin of the extrudate, that is, the melt directly and small The part of the wall adjacent to the hole is heated to a very high temperature by the extremely hot mold hole surface, which causes the viscosity of this part of the melt to be extremely low, and at the same time due to short contact or residence time, the extrudate The body is kept at a lower temperature. The greatly reduced viscosity of the outer skin is like a thin lubricating film, so the extrusion is allowed to turn into a plunger flow, in which the body of the extrudate experiences a uniform velocity. ^ As used herein, "shear rate" refers to the apparent wall shear rate, calculated as 4Q /; rR3 (Q = volume flow rate, R = capillary radius). In the method of the present invention, the shear rate is at least 100 / sec. Ideal fiber melting can be achieved at a given configuration and temperature

Page 15 487745 V. Description of the invention (13) The shear rate range of spinning is gradually narrowed as the polymer melt viscosity increases. The operating window can be enlarged by increasing the temperature instead of the critical shear rate of the melt due to high-speed fracture, but to avoid polymer degradation. The critical temperature / shear rate of melt fracture is determined here by increasing the flow rate of a certain temperature and mold size until the surface roughness can be seen. If the melt extrudate changes from transparent to slightly opaque, it shows melting The body has ruptured. Further increase in the flow rate will result in undesired coarser surface roughness and poorer spinning performance and properties. The spinning speed of the method of the present invention is at least 500 m / min, and it is determined here by the spinning speed of the last roll, which depends on the configuration of the melt spinning device, and can be a roll The take-up roll may be a take-up roll. In the practice of the present invention, it was found that both the shear rate and SSF have a considerable effect on the strength of the spin-spun fiber. Increasing the shear rate and decreasing the SSF can maintain the same strength, and vice versa, which can be proved by Example 1 and shown in the curve of Figure 11. The method of the present invention may further include shielding the filaments. When covering the filaments, the air surrounding the filaments can be maintained at a warmer temperature than the filaments if exposed to uncontrolled ambient air, thus preventing the filaments from cooling rapidly. Uncontrolled ambient air, especially turbulent air, can cause rapid cooling of the filaments, which is not desirable because it can be harmful to the amount of stretching that the filaments may have. Therefore, the shielding filaments allow higher spin-spinning. It has been found that if the melt-spinning line solidifies at a distance of more than 50 times the diameter of the extrusion die (capillary diameter), a high SSF with high spin spinning can be obtained (see also Figure 1 3). The curing distance is preferably more than 500 times the diameter of the capillary. Fused filament

O: \ 62 \ 62592.PTD Page 16 487745 V. Description of the invention (14) The advance is completed by the Xu cooler. The spin cooler allows high-speed spin-spinning to a high degree, thus increasing spin-spinning speed. The molten filament moving through the bottom of the Xu cooler will cause the temperature of the air to be sucked in. The 2❼ line quickly provides the extremely hot molten filaments to be cooled and not fast. The fiber J prevents the melting point from being more than the perimeter to farther from the spinneret than the person who does not use the Xu cooler, and its melting curve is shown in FIG. 13. The use of Xu cooler is also less used = off. This cures the yarn at higher temperatures, as shown in Figure 14. H surplus: ^ to maintain the allowable higher spinning speed, as shown in Figure 15 (Note === to make the cooler).亇 represents a specific example of a Xu cooler that can be used in the present invention. Fig. 1 and the other examples, Xu cooler 200 includes an inner tube 202, which is a long tube in the concentric distribution 2 "4; The diameter is slightly *, and the length can be similar to the inner tube: this ΪΓΓ can be fixed in the outer tube 2 ° 4 and extended below the outer tube 204, for the outlet of the molten filaments, and further in the outer tube 20. 4 tops cause 0 posts. The opening 205 allows air to be drawn into the inner tube 2. Within 2 'inner &amp; 202 can be an annular space between the inner tube 202 and the outer tube 204 &amp; spit #preheating Although not providing external heating, the annular space 2 0 8 can be heated in Xuantianyu by the thermal radiation of the extruded hot-melt filaments. May have a round shape. The top edge 2 1 0 is located on the top of the outer tube 2 04. The mesh tube 2 1 2 which is preferably composed of a fine mesh sieve Hao Ruru ^ mesh front mesh can be fixed to the top flange 2 10, and 9 (1 β # 内 官 2002 inner wall configuration. The mesh tube 212 axial Extending through the inner chamber 206 beyond the opening 2 Κj mesh tube 212, the mesh tube can be provided throughout the entire length of the inner tube. Transport-step includes a second fixed to or immediately adjacent to the first screen

// 45 V. Description of the invention (15) More fine-mesh screens, such as 100-mesh screens, are used to reduce the turbulence of the incoming air, and at the same time, facilitate the substantially uniform distribution of air. 6 through the opening 2 0 5. Also shown is a porous annular plate spacer 2 1 4 which is arranged between the inner tube 202 and the outer tube 204 and is connected to the outer surface of the inner tube 202 or the inner surface of the outer tube 204 and can be used to prevent the inner tube 202 dropped from the outer tube 204. A fine mesh screen 2 1 6 can be placed on the top of the plate 2 1 4 to diffuse and distribute air upwards into the opening 205. These spacers 214 and 216 are used as necessary. The optional glass ring 220 can be used to visually observe the melt spinning line and the front of the spinneret.

The inner and outer tubes of the Xu cooler can be made of materials including metal such as Ming or plastic such as Lucite®. The Xu cooler can be self-supporting or fixed with a suitable mounting mechanism that can be fixed to other components of the melt spinning device or to other materials to keep it fixed. The method of the present invention may further comprise passing the extrudate through the quench zone in one or more strands to a device for collecting the spun fibers. The quench zone can be heated or cooled at ambient temperature, or as required by the specific process configuration used.

Any device for collecting fibers is suitable for practicing the present invention. Such devices include a rotating drum, a piddler, or a winder, preferably with a traverse, all of which are known in the art. Other methods include a process of chopping or cutting continuous spinning and drawing fibers for the manufacture of short tows or fibrous bodies. Still other methods include directly spinning the drawn fibers into a fabric or composite structure on the wire. A suitable type found in the specific examples described below is a high 1 textile type winder commercially available from Leesona (Burlington, NC).

487745 V. Description of the invention (16) For example: 其他 Ϊ spinning technology is known to help the rotation of fibers, these other devices can be used and the like. Lice stick, separation It is known that antistatic treatment can be applied to the fiber. Such treatments are well known in the art. The method of the present invention may further include drawing the fibers, and relaxing the fibers y between the take-up rollers and the set of drawing rollers. These pull; wood

It is known that the fiber content is increased and the linear density is reduced. Take up the parent; give heat to give the fiber a higher degree of stretching, the temperature and the tensile properties depend on the properties. Similarly, "a little bit of the skill; additional steps known can be added to the process to relax the fibers. The present invention also provides a second method of melt spinning a composition comprising a polytetrafluoroethylene homopolymer, comprising The following steps: melting the polytetrafluoroethylene homopolymer to form a molten polytetrafluoroethylene composition; conveying the molten polytetrafluoroethylene to an extrusion die of a melt spinning device; and The molten polytetraethylene composition is extruded through an extrusion die to form molten fibers. In the method of melt-spinning homopolymer, polytetrafluoroethylene (PTFE), preferably pTFE homopolymer, is at a temperature below 48 ° C. Those that will produce melt flow. Preferred homopolymers include Zonyl® fluorine additives, pTFE granular shaped powder grades, such as Teflon® PTFE TE-6472, and PTFE lubricating paste extrusion resins, such as Teflon® PTFE 62, All are available from DuPont (Wilmington, ^ Ε). Because the extreme temperature required to exhibit the characteristics of the melt flow is near the edge of thermal degradation, this method is used on the successful melt treatment of PTFE homopolymers and on spinning fibers This is especially important. The method and composition of

Draw on page 19 487745 V. Description of the invention (1Ό Applicable device. However, the first spinning speed limit may preferably be at least 450 mt at least 200 mpm; ^ The spinneret of the further device of the present invention is always placed The filter device is provided; the long cooler of the spinneret is used. The melt spinning technique is used. The spinneret of the thin tube wall of the spinneret. It is separately removed by two lines so that the self-filtering, assembly, and heating device can cover the conduction known to the person. The above and the inner space of the example are separated by inches. Any filter melt-spun fiber with an extended cooler is made. The part of the spinneret and the opening plate of the meltblowing device or the length and diameter of the spinneret are better. It can be configured so that all the holes are centered or round. The spray is easy to wash or replace. The same spray The wire head is removed. The transfer line includes a belt heater, a coil convection or an induction heater. More detailed description of the extension Xu &amp; outer tube. The inner diameter of the inner tube-steps including the adjacent inner Ming are suitable for melt spinning polygas Recipe of ethylene composition The method found that the mold temperature or shear rate or spin energy is not applicable to the PTFE method. The temperature of the extrusion mold: The spin speed is preferably at least 50 mpm; more preferably 3, most preferably at least 500 mpm. A device for melt-spinning fibers, comprising a filter element; a spinneret; an extension transfer line, the transfer line is arranged between the spinneret; a heating device for heating the extension transfer line and a spinneret; The following devices can be used for the front of the hair, for example, the other parts of the hair are separately heated; the whole part of the body. Spray about 1 ·· 1 to about 8 · · 1. The spinner can be heated evenly. Capillary tube and hoe are preferably self-transferable. The transfer line is preferably a heating device and a spinneret heater or cooked. The cooler of this technology preferably includes an inner wall of the tube in a circular shape, preferably from about 3 inches to about 8 Configuration mesh

487745 V. Description of the invention (18) The tube 'extends to at least a part of the length of the inner tube. The elongated cooler can be further advanced. It includes at least one perforated plate arranged in the annular space, extending radially around the outer tube, and attached to the outer tube of the inner tube, the inner wall of the outer tube, or both. Screens can be placed on or near these multiwell plates. The air can enter the annular space of the Xu cooler through the opening or the orifice. The Xu cooler may further include a device for measuring or controlling the air flow rate, such as a needle valve or a flow meter. The device of the present invention may further include a device for collecting and spinning filaments. Any device known in the art can be used, including, but not limited to, a take-up roll, a branch roll, and a take-up roll.

A specific example of the apparatus for solvent spinning according to the present invention is the Ni_Y net spinning horse apparatus 100. Shown is a feed hopper 02, to which the polymer composition, preferably in the form of pellets, is added. These pellets are heated and transported through a screw-top extruder 103. After the polymer or blend is melted, it is pre-pressurized and conveyed to the pump base 104, passes through the filter assembly 105, and transfers the line 106 to a spinneret 107 with a front surface 10. The glass sleeve 109 can be used to observe the molten filaments. Dissolved oxygen? The composition is extruded through one or more small holes of the spinneret 1 07 panel 1 08, and is formed into a continuous strand. The strand is introduced through an elongated cooler 1 1 0, where the strand is shielded to Prevents rapid cooling. When leaving the cooler, the spinning fiber is the front x

The tail wire guide m is changed in direction by the guide wire guide 116 for surface treatment as required, and then to a pair of take-up rollers 113, a stretcher 1 1 4 and a winder 1 15. Additional stretching may be added, or a pair of stretching. The fibers made by the method and device of the present invention can be used to add ports to loosen, πσ. Π Λ V. ^ goods can be used in advanced sportswear, such as socks. These furnaces are where Fan Xun seeks to attack, and Keke and other fiber towns

487745 Description of the invention (19) Hybrid fabric. PTFE fibers can be used for industrial grade yarns for wet filtration. Ptfe fibers can also be shredded for dry lubricant bearings. Examples The following polymers are used in the examples (all available from DuPont,

Wilmington, DE) purchased:

Teflon® PFA 340, a polymer of TFE and perfluoropropyl vinyl ether

Teflon㊣FEP 5100, copolymer of TFE, hexafluoropropylene and perfluoroethyl vinyl ether

Zony1® MP-1300 PTFE Teflon® TE-6462 PTFE Teflon® PTFE TE—6472, granular shaped powder Tefl0n® PTFE 62, lubricating paste extrusion resin

Zony1® MP-1600N, PTFE Unless otherwise stated, the polymer used is 10n® PFA 34. tm measures the effects of spinneret temperature, shear rate, and spinning stretch factor (SSF) on spinning speed. Rotary spinning uses a 1.0-inch-diameter steel single-screw extruder connected to a spinning pump base, which in turn is connected to a spinneret with the following characteristics: · Bypass plates are used instead of spinning Wire pump. An elongated spinneret 2 as shown in Fig. 2 was used, where nh 'π was 2.0 inches. A 30_Mill 39-hole spinneret is used, in which all holes are all in a circle to cover a low to medium shear rate, such as a shear rate of 60 / sec to about 180 / sec. 5—Mill 2 5—hole spinneret, head to cover medium to high shear rates, for example, about 350 / second to about 1,500, / second '. V. Invention ^ (20 ^ &quot; — 'inch to' 1 · 25 pairs of inner diameter coil heater (Industrial heater company) wrapped around the 1 inch portion of the filament / long spinneret, and will use it to include Panel spraying and heating are separately heated. The conventional coiling roller and winding machine are used. The temperature distribution in front of the silk head is a screw extruder of 3 〇t, and the pump seat is occupied by the press and the spinneret. The combination filter was 38 ° it. Three swirling operations were performed using Tef lon @ pFA 40. The spinneret temperature was set at 42.0 ° C, 4600 ° or 500 ° ... 'Solution at 42 ° C Fracture (MF ·) occurs at a potential shear rate of about 180 / sec. The highest possible spinning speed of all filaments without melt fracture is slightly below 219 mpm at a shear rate of about 90 / sec. At this speed And the fiber tenacity at the time of shearing is 1.02 gpd. The maximum spinning speed of the final fiber break is 49 0 mpm at a shear rate of about 60 / s, and the fiber tenacity is 1.68 gpd, and the fiber denier is It is 4.0. At 4 60 ° C, the spin-spinning shear rate is increased to slightly below 7 2 0 / second before melt fracture occurs. The highest measured at the time of initial fiber break The spinning speed was 435 mpm at a shear rate of 160 / second, and the fiber possessed a tenacity of 1.13 gpd. The highest spinning speed of the final fiber break was 850 mpm at a shear rate of about 160 / second. Spinning The highest fiber tenacity of the fiber to the last filament break was 1. 61 gpd. The spinning speed was 580 mpm and the fiber denier was 2.0. The shear rate of the spinneret sample at 50 0 ° C was measured for spinning The curve of the stretching factor is shown in Figure 11. The dark triangles represent the data of the initial fiber break, and the hollow triangles represent the data of the last filament break. At 500 ° C, the spin-spinning shear rate is in the melt Prior to the occurrence of cracking, it was advanced to slightly below 1,150 / sec. The highest spinning speed of the initial fiber break was at a shear rate of about 180 / sec.

487745 V. Description of the invention (21): 9 3 3 mpm, and the fiber has a tenacity of .04 gpd. The maximum spinning speed of the final fiber break was 930 m pm at about 180 / s, and the mobility was 1.15 gpd at this speed. Therefore, it can be seen that as the spinneret temperature increases from 4 2 0. 〇 increased to 500. 〇, the achievable spinning speed increased by 4.3 times. Temperature, at the initial fiber break at a constant shear rate, has a positive effect on SSF, as shown in Figure 12. Dark circles show SSF at 42 °; dark squares show SSF at 4 60 ° C and dark triangles show SSF at 500 ° c. The SSF in the turning direction means that at the same flow rate and a certain spinning hole size, the take-up roller speed is higher than the spinning speed. ^ In the remaining examples, unless otherwise noted, the spinning system uses the above-mentioned equipment, but uses a 1.5-inch diameter corrosion-resistant single-screw extruder (κ 丨 丨 1 丨 〇n extruder company, Cedar Grove , Made by NJ ·). This type of extruder has three heating zones that are open. In the following temperature distribution, "screw zones 1, 2 and 3" are used to express the use of clamp rings to fix the extruder and the screw adapter together, and the screw The adapter is then fixed to the spinner adapter. The clamp ring is heated by a cylindrical cartridge heater, while the spiral adapter and the spinner adapter are heated by a cassette heater. The belt heater is used for heating Filter assembly. Unless otherwise stated, 'Any existing transfer line and spinneret front is heated with a tape or coil heater. Use conventional winding and winding devices, including Leeson winders. Spinning Use 30-mil 30 ~ hole extension spinneret. Spray speed is 1 · 9 'at flow rate 丨 · 3g / min / hole. Spinning temperature of the device () 487745

The distribution is: Spiral zone 1 ', 2—350 350 Spiral joint spinneret ^ -——--- Applicator spinneret 350 380 353 480 480 500 Shearing rate is 3 2 8 / s The degree mpe 'is based on the spinning draw of the initial filament break (FFB). The fiber denier, duty, elongation and modulus of the fiber obtained by $ 8 are K5 :. gpd / 61% / 5 · 6 gpd. ⑺ 马 · 11 d / Ο · 了 6 Example 3 The spin spinning system of this example is performed similarly to Example 2, but the next 5 inches are asked to form a cone-shaped aluminum cooler. Does the spinneret appear to obscure others? What Wu Muqi took in melting the filaments to protect them. The cross section of the Xu cold appliance is square, the top is 2 inches, and the bottom is 1.0 square. The same ‘degree / blade elevation’ used in Example 2 was used, but with the following change: 38 °. 〇 Spiral adapter, 47 ° It spinneret adapter, 4 70. (: Combined filter. Shear rate is 32 8 / sec. At the same flow rate of 1.3 g / min / hole and the same 30-mil 30-hole extension spinneret used in the same example 2, the highest spin spinning Increased speed by 35%, or 385 mpm to 1,485 mpm, based on the SSF at FFB of 782. The obtained weaving and weaving denier 'Broth' elongation and modulus are: 9.4 d / Ό. 2 gpd /% 6% / 5.1 gpd 〇: Example 4 This spin spinning system was performed similarly to Examples 2 and 3, but two different spin coolers were used for this spin spinning, using 6 feet with a 12-inch x 12-inch square cross-section. 3 inches tall

Page 25 487745 V. Description of the invention (2Γ)) Self-supporting Luc it e® cooler. The same temperature used in Example 3 was used. The shear rate is 328 / sec. The maximum spinning speed is increased to 丨, 756 mpm, with an SSF of 9 24 ′ at FFB. This is a 60% increase in spin speed compared to Example 2, or an 18% increase in spin speed compared to Example 3. The denier, tenacity, elongation and modulus of the obtained fibers were 6.0 d / 1.16 gpd / 28% / 10 gPd, respectively. Example 5 This example uses a spinneret assembly having a shortened and extended spinneret as shown in FIG. The distance between the bottom surface of the filter assembly and the reed head panel is 1 · 2 5 忖. The same temperature distribution and the same 6 inch 3 foot Luc it e® cooler used in Example 4 were used. The shear rate is 32 8 / sec. The maximum spinning speed reached is 1,860! 1 ^ 111 ’ ? 33 o'clock at 8 o'clock is 979. This high-speed sample is not tested: fiber properties, but under the same conditions, the other samples spun at a shear rate of 342 / s and a spinning speed of 7.1 0 1 mpm have fiber properties (denier, toughness, elongation κ The ratio and modulus are respectively): Yes, 6 d / 1.01 gpd / 68% / 6.2 gpd. Example 6 The spinning system was performed as in Example 5, but the shortened lengthened spinneret was heated using an induction heating coil and used the following temperature distribution change: 44 0 combined filter 5 2 2-5 3 1 ° C spinneret . The denier, tenacity, elongation and modulus of the obtained fibers were: 9.6 d / 1. 06 gpd / 49% / 8. 7 gpd. Example 7. * 7 ~ 'Second: The spinning system is performed as I down 6 but the Xu cooler used is the same as that used in Example 3: the two cone-shaped mismatched Xu cooler. In order to observe the spinning assembly line, a 12-leaf cubic transparent Lucite® box is added on the top of the Xu cooler. The shear rate is 342 / second. The maximum spinning speed at FFB is I860 mpin. Denier, tenacity of the obtained fiber,

Page 26 487745 V. Description of the invention (24) d / Ι. 02 gpd / 54% / 7. 7 gpd Elongation and modulus are as follows: Example 8 The spinning system is used as shown in Figure 4 &gt; _ ^ heating (Can be obtained from the industrial processing demon silk head f line 'the spinner has g in the center of the spinneret and a standard belt type is added outside the spar, s \ ratford, CT), and the spinneret length of the panel is 125 ..., beneficial. Filter assembly bottom to spinneret • &lt; 5 ~ 5. The temperature distribution used is: Spiral zone 1 2 350 350 350 ^ Spiral spinneret combined filter spinneret $ 3 ^ 8 Dual adapter central spinneret 380 380 411 410 496 500 Spinneret used has 2 6 holes; iron But ^ remains the same. Therefore, the flow rate of; =, the mother hole is the same as that of Examples 2 to 6. The spinning speed is 丨, 9 7 6 mpm, and the rate is about the same, that is, 3 4 2 / sec. The 6% increase in the maximum rotation is attributable to a solution t 2 of 1,040. Compared with Example 5, the fiber properties -... the degree of brilliance has a more uniform heating in the Δν silk head. gPd / 55% / L gpd. The elongation and modulus are respectively: 5.6 d / 1.09. Spinning the same with the spinneret adapter and combination filter 4004 and the spinneret are the same and the same. + The maximum speed obtained is SS F, 〇 丨 〇 at 丨, 9200mpm ° fiber stiffness is high, while the denier, toughness, elongation and modulus of the fiber are difficult to reach: 5.6 d / 1, 2 5 gpd / 5 4% / 7 g P d. Example 9 Using the spinneret assembly shown in Figure 6 to test the effectiveness of this specific example to achieve high spin spinning continuity. $ 零 菊 1 5 hole 1 · 0 inch diameter with 30-mil diameter hole round: daddy silk head. The Xu cooler used was the 6-foot-3 inch dagger used in Example 4 ^ 丨 七 ^ 徐 冷 —

0: \ 62 \ 62592.PTD Page 27 487745 V. Description of the invention (25). The combination filter uses a belt heater. The transfer line measured from the bottom of the filter assembly to the spinneret disc was 3 · 1 2 5 忖. At a screw rpm of 4.0, the total flow rate was 2.0 3 g / min (2.7 lb / hr) or 1.3 g / min / well. This is approximately the same as the flow rate per well in the previous example. Under the following conditions, the spinning speed reached 丨, all filaments were complete at 8 丨 6 mpm: the temperature of all three zones of the screw extruder was set to 3 50 ° C; the clamp ring and the screw adapter were set to 3 8 0 t , The set melt temperature is 3 89 ° C; the spinner head adapter and combination filter are set at 4 30 ° C; the transfer line is set at 4 7 0 ° C; and the spinneret is set at 5 0 ° C . Spinneret adapter and combined filter temperature reduction and transfer line temperature increase further improved spinning speed: Spinneret adapter properties; and combined filter transfer line spinneret maximum speed denier / toughness / elongation / view 〇C 474〇C 500 ° C 1,816 mpm 6.5 / 1.20 / 45% / 10 420〇C 471〇C 500 ° C 1,969 mpm 5.5 / 1.24 / 24% / 12 410 ° C 471〇C 500 ° C 1,965 mpm 5.6 / 1.38 / 35% /! 3 400 ° C 470 ° C 500 ° C 1,950 mpm 5.8 / 1.27 / 32% / 12 400 ° C 480 ° C 500 ° C 1,994 mpm 5.3 / 1.48 / 48% /! 2 Spinning speed reached 1,9 9 4 mpm is a 14% improvement over the spinning speed of 1,756 mpm of Example 4. The shear rate was 34 7 / sec. The fiber tenacity ranged from 1 · 16 gpd to 1 · 4 8 gpd. . This improvement in strength, in addition to higher load, is due to less or no degradation of the H-mer compound. Two: Sub At 1, 00 mpm, hour, collect several yarn samples to test the spinning process in winter

O: \ 62 \ 62592.PTO Page 2 «page 487745

Long-term stability. Filament spinning has excellent continuity, and can be wound with β Q points and 丨 05 points, both of which are randomly dropped. The fiber properties ~ denier / toughness / elongation / modulus are: 11 d / 0.94-1.01 gpd / 68-80% / 7.5 gpd. At 1,50 G in p m of suspected spinning and lasting a quarter of a sample, the denier of the filaments / brightness / elongation / modulus were: 7.2 d / 1.20 gpd / 39% / 11 gpd. Spin-spun at 1,000 mpm and stretched in the lower line at 2800 t. In another sample, the denier / toughness / elongation / modulus of the fiber was 7 · 6 d / 1.4. Gpd / 2 5% / 1 4 gpd 〇

Measurements of air samples collected at the exit of your cooler along the yarn path above the heated take-up roll and above the winder did not detect any outgassing. Thermal degradation of polymers generates gases. Since the released gas can also enter or dissolve in the fiber, the fibers collected in the vial and its head space are used at different times using infrared spectrometry, gas chromatography / mass grammar, and ion layer. Analytical method does not contain any released gas. In addition, the fiber sample was heated to 200. (: In order to release any dissolved gas, but none were detected. These results confirm that although temperatures as high as 500 ° C are used in this method to promote high shear rates, high spin speeds, and high SSF, but No polymer degradation. PFA polymers will easily degrade when subjected to temperatures as low as 425 ° C for more than 1 minute.

Example 10 This spin-spun umbrella was used in Example 9, but about 1/8 of the induction heater was fastened and wrapped on the front of the spinneret twice. The temperature of the screw extruder to the screw adapter was kept the same as in Example 9. The shear rate was 34 7 / sec. SSF at 1,087 at FFB, maximum spinning speed (1,994 mpm in Example 9) to 2, 06 5

Page 29 487745 V. Description of the invention (27) m p m has an improvement of 3.6%. The highest speed and properties obtained are shown in the lower spinneret adapter and combined filter transfer line spinneret properties. Maximum speed denier / toughness / elongation_modulus

430〇C

400 ° C 470〇C

480〇C 520 ° C

525 ° C 1,910 mpm 2,065 mpm 6.9 / 1.04 / 59% / 6.5 5.6 / 1.2i / 32% / ll Spinning continuity proved to be excellent, when the sample was spun at 9 97 m p m for 90 minutes and unwinded at will. The fiber properties-denier / toughness / elongation / modulus were: 1 0 · 3 d / 0. 97 gpd / 68% / 3. 6 gpd. Example 11 1 A spinneret assembly as shown in FIG. 8 was used, and the front diameter of the spinneret was 1.7 5 &quot;. There are 60 holes with a diameter of 30-mil, and the total flow rate is 8 1 g p in or 10. The flow rate per hole is 1. 35 gpm. Example 7 Conical aluminum cooler with 12 inch Lucite® box at the top "The temperature (° C) distribution is: Spiral zone 1 3 Spiral spinneret combined filter clamp ring adapter adapter connector transfer Spinneret 350 350 350 380 380 400 400 477 500 The maximum spinning speed is 1, 3 5 9 mpm. The shear rate is 3 4 7 / sec. The fiber properties-denier / toughness / elongation / modulus were: 8.0 d / 1.04 gp &lt;! / 6 7 0 / 〇 / 7.1 gpd. The reason why the spinning speed is lower than that of the 30-hole spinneret of Example 7 is considered to be that the total amount of circulation and the volume is twice as large, which causes the Xu cooler to retain too much heat. : Wipe cold

O: \ 62 \ 62592.PTD Page 30 487745 V. Description of the invention (28) The device is replaced by a large-capacity 6 suction 3 pair Lucite® box cooler. ^ The spinning speed is increased to 1,500 mpm. The temperature used (.factory, southernmost) cloth is: Spiral zone 1 Spiral spinneret combination ^ Clip ring connector adapter 350! 50 350 380 380 420 Spinneret 420 500 520 Fiber properties-denier / toughness Degrees / elongation / modulus are: 7.2 d / 1 2Q gpd / 48% / 9.4 gpd 〇 To reduce excessive heat retention in the cooler, it will be set along the length of the cooler and almost covers one side of the cooler. The cooler door is fully open and covered with a perforated screen to provide quiet air movement without turbulence. The use of 3/3 2 hole diameter holes, 3/16 inches of porous metal plates separated from the center of the hole, compared with the use of the closed door cooler, the maximum spinning speed to 1,623 mpm improved by 8%, using the following slightly Different temperature (° C) distribution: Spiral zone ^ Spindle spinneret combination filter __1 ^ __ Certificate ^ Connector transfer line spinneret 350 350 350 380 380 400 400 500 520 Fiber properties-denier / toughness Degrees / elongation / modulus are: 7. 5 d / i. 18 gpd / 5 0% / 8. 9 gpd 〇 Before the above ^^ metal plate was covered, some cool air was observed by the cooler. The 'moving' cause: there is diffused air moving in and out in the front and none on the other three sides. The thermocouple placed near the front of the spinneret showed a temperature change from 3 6 8 ° C to 3 9 0 ° C, or 2 2 ° C.

Page 31 487745 V. Description of the invention (29) Use a larger Lu cite® cooler; 20 ”x 24” in cross section, 71.5 ”in height, with a spinneret opening at the top and an opening accessible to the spinning line at the bottom . During spinning, there is too much up-and-down air movement, which reduces the spinning speed. Place the insert on the bottom of the cooler to reduce the 20 "x 24" opening to a 20 "square. These inserts are tapered downwards and the reeling yarn will fall in. The measured temperature fluctuation is still as high as 25 ° C, but the actual temperature is significantly colder, 240 ° C to 265 ° C (Note: Although the measured temperature of the smaller type cooler is low, but the two The comparison of absolute temperature between devices should not be viewed too correctly, because the position of the thermocouple may not be accurately positioned). The air stability is significantly quieter. For the same temperature distribution, the maximum spinning speed is improved and slightly higher than that recorded by the small spin cooler: 1,680 mpm. Fiber properties-denier / toughness / elongation / modulus are: 8.2 d / 0.84 gpd / 59% / 5.9 gpd. Example 1 2 In the case of the Xu cooler of the aforementioned design, it is necessary to contact the yarn at the bottom of the Xu cooler in order to send it to the suction pipe to make the yarn reach the end of the winding machine during the entire yarn processing distance (stri ng i ng up), some difficulties. In addition, the cold end of the melt spinning line depends on the natural air convection being left uncontrolled. These two problems are solved by the design of the cooler as shown in Figures 10 A and 10 B. This cooler easily allows the yarn to be bundled around its bottom conical outlet (p i c k i n g-u p). The incoming air from the compressed air f passes through the ring-shaped space s between the inner and outer tubes, and passes upward through the dry + fine mesh screen to eliminate vortices, enters the top and radially faces the molten filaments. Air is allowed to enter through the hole α below the cooler, while the air velocity is controlled by the needle width and measured by a flow meter. 6 inches above the inner tube

487745 5. Description of the invention (30) degrees can be detected by thermocouples separated by 1 inch. The height of the space entrance hole between the inner and outer tubes can be adjusted between 1.0 inches and 4.0 inches. The 1.0-inch-high glass ring allows visual inspection of the melt spinning line and the front of the spinneret. The spin-spinning system is performed using a spinneret assembly configured as shown in FIG. 8, which has a 30-hole 3 9 · 4-mil diameter and a spinneret having a length / diameter ratio of 3.0. Spinning is performed at a flow rate of 1.3 gpm with the following temperature distribution: 3 50. (:, Screw extruder to combined filter; 45 ° C, transfer line; and 500 ° C, spinneret. The temperature inside the Xu cooler is: 2 6 8 ° C, 1 from the front of the spinneret Inches; 2 5 2 ° C '2 inches from the front of the spinneret; and 2 2 ° C, 6 inches from the front of the spinneret. Temperature fluctuations can be ignored because the change is only 2 ° C, compared with the previous example The change observed by the Xu cooler is as high as 25 ° C. The shear rate is 15 1 / s. The maximum spinning speed reached is 1,737 mpm, fiber properties-denier / tenacity / elongation / die The numbers are: 4.2 d / 1 · 17 gpd / 57% / 7. 8 gpd. When the spinning continuity is excellent, it consists of 1, 5 0 5 mpm, 3.5 hours of yarn package and 240 The solidity of this spinning system has been proven when the coiling speed of 702 mpm is 1,4 times the in-line stretching performance. The net weight of the yarn package exceeds 20 pounds, and it is in a 6.0 inch tube. The silk cake on the tube is 2.0 inches thick. Temperature (. :) Spiral zone 1 2-3 350 350 ^ -350

Spiral spinneret combined reduction clamp ring adapter adapter transfer line spinneret. 350 350 350 350 448 500 1: Fiber properties-denier / toughness / elongation / modulus are: 12. 6 d / 0. 80 gpd / 92% / 3,8 gpd.

Page 33 487745 V. Description of the invention (31) Example 1 3 The spinning system was performed as in Example 12, but Teflon® FEP 5100 fluoropolymer was used instead of PFA · 40. The temperature (. &Lt; :) distribution is: Spiral zone spiral armature spinneret combined filter 1 2 3 clamp ring adapter adapter adapter transfer line spinneret 315 319 325 325 325 325 325 401 480 The temperature used in this example is higher than PFA polymerization It is low because FEP is less stable than PFA. The shear rate is 161 / sec. The highest spinning speed reached was 1,290 mpm. Fiber properties-denier / toughness / elongation / modulus were: 7 · 3 d / 1 · 04 gpd / 36% / 10 gpd. Example 1 4 This spinning system was used to test the robustness of the process developed in Example 13 for the Teflon® FEP 5100 polymer. The excellent spin-spinning continuity of the same design using Examples 1 2 and 13 was obtained at a 3.5-hour bobbin display obtained at the same take-up speed of 7 0 mpm as the PFA polymer of Example 12. The yarn is stretched at the same draw ratio of 1.4 times outside the line, but at a lower temperature of 20 ° C, because the melting point of FEP (260 ° C) is higher than the melting point of PFA (3 0 5 ° C). As low. The yarn package was similar to the PF A 3 40 polymer spin spinning of Example 12. The used temperature (° C) has a more solid distribution. Example 1 3 is used, that is: · -2-a spiral area spinneret spinneret combined filter — 7 ^-~~ ^ adapter transfer line spinneret Head J〇5 j1 ° 315 315 315 315 315 315 393 480

Page 34 487745 V. Description of the invention (32) The shear rate is 1 63 / sec. Tensile fiber properties-denier / toughness / elongation / modulus are: 12 · 2 d / 0. 97 gPd / 45% / 5. 8 gpd. Example 1 5 Spinning of a PTFE homopolymer was performed using granulated Zony 1® MP-1 3 0 0 PTFE. The homopolymer granulation type was compacted from a fine PTPH powder using a granulator containing 1,013 0.257-leaf diameter embedded rods and a 2.0-inch thick female mold. The powder with a density of about 0.36 g / ml is compacted in a press at a pressure of more than a ton to make pellets with a diameter of 0.28 inches, a length of 0.50 inches, and a density of 1.58 g / ml. The same equipment and 30-hole spinneret were used as in the example. The temperature (° C) used is: Spiral zone spiral spinneret combined filter _! _ 2,-3 clamp ring adapter adapter transfer line spinneret 400 400 400 400 400 410 410 450 520 from the front of the spinneret The emerging molten filaments appeared translucent and shimmering, showing some degradation. However, the filaments do not come out of the Xu cooler in a continuous form, but come out in small pieces and pieces. The flow rate was changed from 0.17 g / min / hole to 1.33 g / min / hole without generating continuous filaments. After the MP-1 3 00 pellets flowed from the hopper, about 2 Q0. G of powdered homopolymer TE- 646 2 was added to the hopper and extruded to grow a continuous fiber filament. Free fall: continuous filaments are tough and can be handled or lightly pulled with your fingers without breaking. The filament count was 349. Example 1 6

Page 35 487745 V. Description of the invention (33) Spin spinning Teflon® PTFE ΤΓΕ-6 472, increase the extruder and spinning device used in Example 15 to the following high temperature (° C) distribution, and first use PEA 340 to Avoid degradation of the PTF.E homopolymer due to stagnation in the heating process lasting 2.5 hours: Spiral zone spiral spinneret combination filter __ 丄 ― 2 3 clamp ring adapter adapter transfer line spinneret Head 470 470 470 470 470 470 470 470 450 510 Teflon® PTFE TE-6472, which is classified as granular molding powder, is compressed, added after the PFA pellets are cleared, and the screw is rotated at 14.0 rpm. Six minutes after the addition of Teflon® PTFE TE-6472 pellets, it was found that the pressure of the filter assembly rose rapidly from 204 psi to more than 1,000 psi, indicating that Teflon® PTFE TE-64 72 had reached the joint. Adjust the spiral speed at any time and raise the spinneret temperature to 55 ° to maintain the assembly pressure at 1,000 psi. Extruded was continuous transparent molten filaments, but contained air bubbles, showed thermal degradation, and solidified into white filaments. At 2.0 rpm, the measured throughput was 7.6 gpm, while the expected flow rate was 10.5 gpm. Even though the spiral rpm was maintained at 2.0 rpm, it was found that the throughput would continue to drop to 0.4 gpm 'and the continuous filaments began to break into a tip (between 48 inches) and a very fine filament ( drips). These extremely thin filaments are visually similar to light ridge cobwebs and float in the air. The measured fibril denier number was between 0.6 and 18 and below. This clearly proves that P T F E can be melt-spun to extremely fine filaments. ， ’, — The reason for the decrease in the flow is that the ring of the tube inlet of the extruder is blocked, which is effective.

Page 36 487745 V. Description of the invention (34) Prevent the addition of fluoropolymer pellets. To clear the blockage, remove all polymer until the helix is visible. Add the p F A pellets and push in using a special rectangular plate (dimensions to the tube opening) fixed to a 0.5 inch rod. Turning the screw will cause the small particles of PFA to scrape out the sticky PTFE compressed powder from the surface of the screw. After the blockage is cleared and the feed is resumed, the PTFE compressed powder is added again. At a spiral speed of 5.0 rpm and a measured throughput of 9.3 gpm, continuous filaments can be spun in all 30 holes and taken up by a take-up roll at 30 mpm. Excellent spinning continuity lasted about 15 minutes before ring clogging occurred, which can be seen from the reduced pressure in the assembly. This test clearly demonstrates that the homopolymer PTFE can be melt-spun. The temperature (it) distribution is: Spiral zone spiral armature spinneret combined furnace 1 2 3 clamp ring adapter transfer line spinneret 420 440 480 485 485 485 485 495 500 500 PTFE fiber samples can be transported without brittleness And according to the tensile test. Sample identification fibril denier strength (g) Toughness (gpd) Free fall 686 36.0 0.05 Free fall 1,042 71.8 0.07 30 mpm 332 14.0 0.04 Example 1 7 ^ 5 *, two * * Classified as a moisturizer; smooth paste Pressed resin ef 1 on® PTFE 62-spin spinning. The powder is similarly compressed into cylindrical particles under a pressure of 50 tons, with a diameter of 0.28 inches and a length of 0.52 inches and a density of about 1.6 g / cc.

Page 37 487745 V. Description of the invention (35) Use the same equipment and starting procedure as in Example 16. Tef Ion® PTFE 62 pellets were added at a spiral speed of 3.8 rpm. The addition was good at the beginning and the measured flux was 9.9 gpm, compared to the expected 20 gpm. Increase the screw speed to 7.7 rpm. It was found that the pressure of the assembly kept rising and kept at 1,200 p s i by decreasing the spiral speed, indicating that the joining condition was good. Ring clogging again causes the assembly pressure to decrease. Raise the screw to 30 rpm again, the blockage will loosen and the assembly pressure will increase. At 10 rpm, the assembly pressure climbed up to 2,150 psi when the continuous filament was spun at 55 mpm. Spinning continuity lasted about 5 minutes before ring blockage occurred again. Example 18 The fibers spun from Examples 16 and 17 were heat drawn in a heated salt bath. The filament was cut into about 1 inch, fixed in the middle of the two-point tweezers, and stretched while immersed briefly in the salt bath. The stretching temperature is from 330 ° C to 400 ° C. Weaving fabrics cannot be stretched at 320 ° C. The melting point of PTFE homopolymer is from 325 ° C to 342 C, so the fiber is drawn in the molten state. The filaments are easily stretched by a draw ratio of 5 · 0 to 8 · 0. The fibrils change from light with no better orientation under cross and polarized light to strong blue in one direction and at 90. The pink color of the direction indicates a better molecular orientation along the fiber axis. 34 0 ° C stretching temperature maximizes orientation. 2 gpd。 Tensile fiber with a measured denier of 7.7, the resulting toughness of 0.2 gpd. Example 19-One: A spinneret spinning using the spinneret described in Example 9 and shown in Fig. 6-PFA-3 4 0 'and compare the conventional spinneret assembly that cannot be heated separately. The spinning conditions of the design (see Figure 1) and the thermal separation of the spinneret and the combined filter

Page 38 487745 ~, Description of the Invention (36) — Spinning conditions of silk ends. The thermal separation in this example was obtained in part by adding a transfer line between the bottom of the combination ferry and the front of the spinneret. Two control groups were run using the same spinneret system but keeping the spinnerets at the same constant temperature. A 10-hole 30-mil spinneret was used.

The first-control group spin spinning was performed by keeping the temperature (t :) distribution at 3 5 ϋ ° c as shown below: Spiral zone spiral spinneret combination filter 1 1 2 3 clamp ring adapter adapter transfer line spray The wire head 350 350 350 350 350 350 350 350 350 increased the throughput until some micromelt rupture was found at 0.178 gpm / well. The shear rate at the highest throughput was 45.7 / sec, and the highest spinning speed reached was 58 mpm, while the jet speed was 0.26 mpm and the SSF was 223. The second control group spin spinning system was performed at a higher temperature distribution of 400 ° C as shown below: Helix area spiral armature spinneret combination De i 2 3 clamp ring adapter adapter transfer line spinneret 35〇350 350 350 350 350 400 400 400 Higher temperature 40¾ ^ ¾: Allow the flow rate to reach 0.37 gpm / well before the main multibody rupture occurs. At a lower flow rate of 0.238 gpm / hole before the rupture of the body, the maximum spinning speed is 206 mpm. At the highest throughput and at the edge of the solution rupture, the maximum spinning speed reached 3 8 1 mpm, at which time the shear rate

Page% 487745 V. Description of the invention (37) is 95 / s, spraying speed is 0.54 mpm and SSF is 704. Use the following temperature (° C) distribution: Spiral zone 1 Spiral spinneret combined filter clamp ring adapter adapter 325 330 335 335 335 335 335 335 450 500 at this temperature, the flow rate can be advanced up to 1, 12 5 gpm / well, 3 times the control group with a uniform temperature of 400 ° C, and The melt has not yet broken. The highest spinning speed reached is 1,956 mpm at a shear rate of 2 8 9 / s, and a jet speed of 1,6 4 511 ^ 111 and 33? 1,189, which is 5 times the uniform 4 0 0 ° C. Control group. The control group test was not simulated at 500 ° C, because in conventional spinneret systems, the combined filter must be heated to the same temperature of 500 ° C. When the combined filter is at 50 Q ° C, the polymer will be severely degraded due to the long residence time in the combined filter, 10.1 minutes. At 4 2 ° C, the polymer will begin to degrade in less than 1.3 minutes. Example 20 The following test was performed to determine the distance from the front of the spinneret when the molten filament was solidified. Curing confirmed that it occurred when the transparent filaments became opaque. This observation is more clearly seen with the high-intensity light directly following the tow. The transition from transparent to opaque can be observed from free fall (by gravity) to speeds up to 200 m p m. The extrusion of the melted filaments was performed with or without a chilled tube. In the case of U waste cooling pipe, a special transparent glass Xu-cooling pipe is used so that it can be inspected with an eye 1: ¾; the Xu cooling pipe is 3.0 inches in diameter and 41 leaves long. So: ¾ The spinneret has 30 36-mil diameter holes. Using Teflon® FEP- 51 00 Poly

0: \ 62 \ 62592.PTD Page 40 487745 V. Description of the invention (38) Compound. The results plotted in Fig. 13 show the data of the hollow cooler without the cooler, while those using the cooler are the solid ones. The curve shows the temperature of three fixed spinnerets: 38 0 ° C (triangular symbol), 43 0 ° C (square symbol) and 48 0 ° C (circular symbol). function. The curve shows that at a fixed temperature, the curing distance increases with the increase in total throughput. This curve also shows that at the same throughput, the curing distance increases as the spinneret temperature increases. In addition, the curve shows that the curing distance is about twice as long as when using a cold tube. In another test in which the solidification distance was increased from about 6 pairs to about 15 leaves at a take-up speed of 200 mpm without using a cold tube, the effect of fibrillation was shown. Therefore, the curing distance shown in FIG. 13 represents the shortest curing distance. Use the following temperature (° C) distribution: Spiral zone spiral nozzle # __13 Clip ring connector adapter transfer line spinneret 275 285 295 315 315 315 315 315 380 380,430,480 Example 2 1 PTFE homopolymer grade, Zony 1® MP-1600 N, melt processed and spun into fibers using a spinneret assembly as shown in FIG. Put the polymer powder in a 0.5-inch high female mold with a 0.25-inch straight roll, and use a 0.2-inch straight- 疰 rod to compress it into a thin disk with a thickness of about 0: 1 inch. . About 2 pounds of these thin disc pellets were made. Add the pellets by hand to the screw extruder until it just fills the spiral part of the spiral to prevent crushing and causing sticking and ring blockage in the spiral. use

Page 41 487745 V. Description of the invention (39) The following temperature distribution. Spiral area, 1 2 3 clamp ring Spiral adapter Spinneret adapter Combined filter Transfer line spinneret 380 385 390 390 390 390 390 390 450 500. . At a spiral speed of 1.94 r pm, a 10-hole 30-mil diameter spinneret was used with a throughput of 9.4 g / min and the assembly pressure was 2 38 -246 psi. The cooler used in Example 12 and shown in Figs. 10A and 10B. No ring blockage was encountered. Spinning stopped when the pellets were used up. 10 filaments are bundled by hand and sent to the take-up roller, and after winding once, the yarn is swept all the way to the Lee s n a winder using a straw. The initial spinning speed was 30 mpm, and the speed rose for the second time to a maximum of 202 mpm. The fiber denier of 3 filaments is measured as: 3 3, 3 6 and 4 1. 4 The properties of the first-spun fiber (denier / toughness / elongation at break / modulus) measured from 1 1 denier filaments are 41 deniers /0.05 gpd / 1 · 3% / 3 · 7 gpd.

Teflon® PTFE 62 is spun with cut pieces and thin disc pellets to avoid ring clogging. The used temperature (° C) distribution is:

Spiral area 1 2 3 Clamp ring Spiral adapter Spinneret adapter Combined filter Transfer line spinneret 440 445 _ 450 450 450 450 450 450 500 ° C Add finely chopped pellets: it will not block. However, the pellet disc eventually caused ring clogging problems. Before clogging, the spinning rate reached 60 m ρ m at shear rates from 1 δ 3 / s to 6 1 4 / s.

487745 V. Description of the invention (40) Example 22 The same spinneret assembly as in Example 21 was used to similarly prepare ZOnyl @ MP-16 0 0 N. PTFE homopolymer powder pellets. Under the temperature distribution, the effect of the spin cooler was studied with and without spin cooler spinning. 4 克 / 分。 Through a 30-mil diameter 30-hole spinneret, the flow rate at a shear rate of 7 2 / sec is 8.4 grams / minute. Spiral area Spiral armature spinneret combination filter 1 2 3 __ Clamp ring adapter adapter A transfer line spinneret

315 330 340 340 340 340 340 340 400 4 00 G m. Xu cooler. About 15% of these extruded filaments fall freely in a vertical step, and 5 suction 8 pairs cannot support their weight. The surviving filaments can be spun at a maximum speed of only 15 mpm before breaking. Using a 48-inch long Xu cooler •• All filaments are constantly free to fall to the floor. The initial spinning speed of the filament break (FFB) was 50 mpm, and the maximum spinning speed (MSS) reached was 480 mpm. Increasing the transfer line and spinneret temperature to 450 ° C and 500 ° C, the FFB is improved to 85 mpm and the MSS is 250 mpm. The yarn is clearly visible as thick and thin. It was found that the uniformity of the yarn was improved as room temperature air was introduced into the top of the cooler through the cooler jacket. At 250 cfh (cubic feet per hour), the yarn becomes uniform. Under this spinning condition, the MSS. Improved to 404 nF. Fiber properties-denier / toughness / elongation at break / die · Thai: 5 · 8/0 · 16 gpdt / l 2% / 8 gpd. Example 2 3 This test uses Teflon® FEP-5100 as the fluoropolymer composition.

Page 43 487745 V. Description of the invention (4i) '--_ ^ Prove the advantages of the thermally isolated spinneret. A spinner as shown in FIG. 8 was used. The control group was also performed in the same assembly, but the temperature of each component was the same. The temperature (t :) distribution of the control k is: &amp; ', Phase holding spiral zone 1 2 3 Spiral ring spiral adapter Spinneret adapter Combined furnace inspection line spray nozzle eg 275 300 350 350 350 350 350- ----- 350 a bee 丨, 350 275 350 400 400 400 400 400 400 400 275 350 400 400 450 450 450 450 450 450 The temperature distribution of spiral zone 1 and 2 is kept low and until the spiral zone 3 or the clamp ring, the test temperature . If the spiral regions 1 and 2 are at the test temperature, the degradation will be more serious ^ The temperature distribution of the sample of the present invention is:

Spiral spinneret combination filter ~ Vertical adapter 300 300 300 300 300 ^ ~

Shear rates were: 86 / sec at 10 gpm, 232 / sec at 27.2 gpm, 3 5 9 / sec at 42 gpm, and 3 8 5 / sec at 45 gpm. As can be seen in Fig. 16, the spinning speed of 1,900 mpm 'was reached without any significant degradation at a spinneret temperature of approximately 48 ° C. However, the control group was 'sufficiently thermally degraded' when the reel head temperature 4 reached the spin spinning speed at this temperature_name shoulder 600 mPm and at about no ° c, the spinning was 'severely heated' degradation. ~

Claims (1)

487745 VI. Application for Patent Scope 1. A method for melt-spinning a composition containing a highly fluorinated thermoplastic polymer or a blend of such polymers, comprising the following steps: Blending a polymer containing a highly fluorinated thermoplastic polymer or these polymers The mixed composition is melted to form a molten fluoropolymer composition; the molten fluoropolymer composition is conveyed under pressure to an extrusion die of a melt spinning device; and the molten fluoropolymer composition is extruded through an extrusion die To form filaments, the mold is at a temperature of at least 450 ° C, a shear rate of at least 100 seconds M, and a spinning speed of at least 500 m / min. 2. The method according to item 1 of the patent application scope, further comprising shielding the filaments. 3. The method according to item 1 of the patent application scope, further comprising exposing the molten fluoropolymer composition to a temperature between the melting temperature of the composition and the temperature of the extrusion die before the composition is propelled through the pressure die. Intermediate temperature. 4. The method according to item 1 of the patent application range, wherein the melt flow index of the highly fluorinated polymer is 1 to 50 g / 10 minutes at 37 2 ° C. 5. The method of claim 1 in which the fluorinated polymer is a copolymer of tetrafluoroethylene and a perfluorocarbon. 6. The method of claim 5 in which the fluorinated polymer is a copolymer of tetrafluoroethylene and hexafluoroethylene. 7. The method according to claim 5, wherein the fluorinated polymer is a copolymer of tetrahydroethylene and a full f.k-based vinyl ether. — '8. The method according to item 7 of the scope of patent application, wherein the perfluoroalkyl vinyl group 0: \ 62 \ 62592.PTD Page 45 487745 6. Scope of patent application Ether is perfluoromethyl vinyl ether, perfluoroethyl vinyl ether, and perfluoropropyl vinyl ether. 9. The method according to item 1 of the patent application scope, wherein the temperature of the mold is at least 500 ° C. 10. The method according to item 1 of the scope of patent application, wherein the extrusion die is thermally isolated from other parts of the device which may contain the fluoropolymer composition. 1 1. The method according to item 1 of the scope of patent application, wherein the spinning speed is at least 1000 m / min. 1 2. The method according to item 1 of the patent application range, wherein the shear rate is at least 500 seconds-l. 1 3. The method of claim 1 further comprising stretching the fiber. 1 4. The method according to item 1 of the patent application scope further comprises a relaxation stage. 15. A method of melt spinning a composition comprising a polytetrafluoroethylene homopolymer, comprising the steps of: melting the composition comprising a polytetrafluoroethylene homopolymer to form a molten polytetrafluoroethylene composition; The molten polytetrafluoroethylene composition is conveyed under pressure to an extrusion die of a melt spinning device; and the molten polytetrafluoroethylene composition is extruded through an extrusion die to form molten filaments. 16. The method according to item 15 of the scope of patent application, wherein the temperature of the extrusion die is at least 450 ° C. 1 7. The method according to item 15 of the claim range, wherein the spinning speed is-less than 50 m p m. ′. 1 1 8. The method according to item 17 of the scope of patent application, wherein the spinning speed is to 0: \ 62 \ 62592.PTD Page 46 487745 t. The scope of patent application is less than 2 0 0 mpm 〇The spin speed is up to further including shielding fiber 1 9. If the method of item 18 of the patent scope is less than 5 0 0 m ρ πί. 20. The method as described in the 15th patent application. 2 1. A device for melt-spinning fibers, including: a spinneret assembly including: a filtering device; a spinneret; an extended transfer line, the transfer line being arranged between the passing device and the spinneret A heating device for the extension transfer line; a heating device for heating the spinneret; and an elongated cooler arranged below the spinneret assembly. 22. The device according to item 21 of the patent application, wherein the elongated cooler includes an inner tube arranged in an outer tube, and the inner tube and the outer tube are separated from each other by an annular space. 23. The device according to item 22 of the scope of patent application, further comprising a mesh tube arranged near the inner wall of the inner tube and extending at least part of the length of the inner tube downward. 24. The device according to item 22 of the scope of patent application, further comprising at least one porous arranged on the annular space, extending radially around the outer tube and attached to the outer wall of the inner tube or the outer wall of the outer tube or both board. -25. If the device in the scope of patent application No. 24, further includes placing O: \ 62 \ 62591 PTD Page 47 487745 t. The scope of the patent application includes the extension of the Xu cooler.) The spinneret can be moved. The transfer line can be moved. The spinneret can be added to the at least one perforated plate or The nearby screen 2 6. If the device in the scope of patent application No. 21 includes a device for measuring or controlling the air flow rate in one step 2 7. The device in the scope of patent application No. 21 operates. 2 8. If the device in scope 21 of the patent application is activated. 2 9. The device according to item 21 of the patent application. The thermal device is a conduction heater, a convection heater or an induction heater. 30. The device according to item 21 of the patent application range, wherein the spinneret has a plurality of extrusion holes, all of which are arranged in a circle. 31. The device of claim 21, further comprising a device for collecting spinning filaments. 0: \ 62 \ 62592.PTD Page 48