JPS59144607A - Formation of fiber bundle and equipment therefor - Google Patents

Abstract

PURPOSE:A mesh spinneret with a large porosity is heated by applying electricity and a fiber-forming polymer is extruded through the spinneret into a bundle of fibers, thus enabling easy formation of fiber mass from a polymer easily decomposable on melting. CONSTITUTION:A fiber-forming polymer is fed to a mesh spinneret with a porosity of at least 30%, prefererably about 40-95%, represented by the equation [Va(cm<3>) is the apparent whole volume per unit volume (1cm<3>) of the spinneret mesh part, Vf(cm<3>) is the total volume of the section parts surrounding the pores per the unit volume (1cm<3>) of the spinneret mesh] and electric current is applied to the spinneret to heat the polymer with the Joule heat and the plasticized polymer is extruded into a bundle into a bundle of fibers.

Description

[Detailed description of the invention]

a Field of Application of the Invention The present invention relates to a new method for directly producing a fiber bundle from a molded article made of a fiber-forming polymer, and an apparatus for producing the same. (b) Prior Art Exterior] There are three known methods for forming fibers from fiber-forming polymers: melt molding, dry molding, and wet molding. In any case, the principle of temporarily making polymer molecules more mobile (ie, plasticizing) in order to make them easier to mold is the same. This plasticizing method includes a melt method and a solution method, the former being applied to melt molding and the latter to dry molding and mixed molding. From an industrial standpoint, there is no doubt that the melt method is more advantageous than the solution method in terms of cost, safety, molding versatility, etc. However, for example, polyacrylonitrile and polyvinyl chloride. For polyvinyl alcohol, polymetaphenylene isophthalamide, cellulose, etc., the decomposition of polymers by heating is more rapid than plasticization, and therefore melt molding is impossible with conventional melt molding methods. Obviously, depending on the method, fibers must be formed by dry or wet molding. On the other hand, in an attempt to apply a method as close to the normal melt molding method as possible to such polymers that are considered to be impossible to melt mold, attempts have been made to plasticize them by combining the melt method and the solution method (・One example is a method of plasticizing polymetaphenylene isophthalamide at high temperature with a complex-forming solvent (see Japanese Patent Application Laid-Open No. 1987-98764). However, in order to avoid decomposition of the polymer due to heating, a considerable amount of solvent must be used, and as a result, a device to extract the solvent thermally or in phase equilibrium is required, and the solution method is still This cannot be said to have any drawbacks.According to the conventional wisdom of melt molding, the first requirement for melt molding is "stability of the molten state."In the conventional melt molding method, Since it takes several minutes to several tens of minutes for a solid polymer to be heated and melted and delivered to the spinneret, stability is required because decomposition and crosslinking properties in the molten state are a concern. However, since decomposition and crosslinking due to heating are closely related to the temperature and the time the polymer is in the molten state, melt molding may be possible if the time is significantly shortened. The scale of quality will also change drastically.Based on this idea, the inventors pursued a new molding method that drastically shortens the melting time.As a result, the inventors' cry is We previously invented and proposed a method for instantaneously melt-molding a solid powder polymer using a heated mesh-like spinneret (see Japanese Patent Application No. 5e-205224). However, the present inventors Not being satisfied with only this proposed method, we have conducted intensive research to develop a further developed method and manufacturing equipment related to this method, and as a result, we have arrived at the present invention. Therefore, an object of the present invention is to provide a method and a compact apparatus for producing fiber bundles from fiber-forming polymers in an extremely simple and efficient manner. is close to the melting point of a fiber-forming polymer, which was conventionally considered difficult or impossible to melt.
& To provide a method and compact device suitable for manufacturing fiber bundles simply and efficiently. Still another object of the present invention is to provide a method and a compact apparatus for simply and efficiently producing #M bundles from various thermoplastic polymers known to be convertible into fibers by melt spinning. Especially Tomo9ro. Still another object of the present invention is that the fiber-forming polymer to be spun is substantially cut by the cutting member until it reaches the heated partition section of the spinning material. The material does not have sufficient plasticity and is not made to have sufficient re-precision to be cut by the partitioning member by the heat applied by the partitioning member until it reaches at least the close vicinity of the partitioning member. The fiber-forming polymer is heated in the vicinity of the spinneret for a very short period of time until it is sufficiently plastic to be shredded by the partition member, thereby causing the fiber-forming polymer to be co-fed into the spinneret. The object of the present invention is to provide an industrially simple and advantageous method and compact apparatus for efficiently converting a polymer into Wt fiber. Still another object of the present invention is to continuously press the #tm-forming component polymer yarn ['' as a molded product into a die with gold, in which case the molded product is Therefore, there is provided an industrially advantageous method for converting fiber-forming polymers that do not have enough plasticity to be cut, but are substantially defoamed, and are industrially advantageous without problems such as yarn breakage. It's about doing. Still another object of the present invention is to smoothly feed a fiber-forming polymer as a molded article to a die equipped with a spinneret without using a melt extruder or a screw extruder, thereby eliminating a large number of pores. FIi, m of the polymer from a spinneret with
The object of the present invention is to provide an industrially advantageous method for smoothly drawing off water as a trickle. Still another object of the present invention is to change the composition and mixing state of the obtained fiber bundle before reaching the spinneret, such as the composition of the fiber-forming polymer and other fiber-forming polymers. To provide a spinning method that does not undergo extensive changes in texture when cut by a partition member trap, as if reflecting the texture of a composition of fiber-forming polymers or other additives. There is a particular thing. Further objects and advantages of the invention will become apparent from the following description. The objects and advantages of the present invention are, firstly, a method for producing a fiber bundle by extruding at least one type of fiber-forming polymer through a mesh-like spinneret having a large number of pores, the method comprising: Using a die equipped with a spinneret having a large number of closely spaced pores with a porosity (α) of at least zo% defined by the following formula, at least one fiber-forming polymer is introduced into the die. The molded product is continuously pressed into the die as a molded product, and the molded product has a compression resistance that substantially retains its shape against the indentation pressure at least initially when the molded product is pressed into the die, and has a compression resistance that substantially retains its shape against the indentation pressure, and is said at least one type of spinneret having a shape with one direction having a very large dimension and to be cut into said mesh-like spinneret by a partition member defining a number of slits in said spinneret. The molded product is extruded from the mesh-like spinneret while applying sufficient electricity to the fiber-forming polymer to provide Joule heat necessary for the cutting, and the cut fiber-forming polymer is formed into a fibrous rivulet. This is achieved by a method for manufacturing a fiber bundle characterized by taking it off. Further, according to the present invention, the method of the present invention comprises a conductor capable of generating Joule heat when energized, and has a mesh-like shape having a large number of closely spaced pores with a porosity (α) defined in the text of at least 30%. a spinneret at the tip thereof, and a passageway leading to the spinneret through which the molded fiber-forming polymer is passed for supplying at least one fiber-forming polymer to be cut to the mesh-like spinneret. A die provided with the die, a pushing means for continuously pushing the molded article into the passageway of the die, and a partition member defining a number of slits in the spinneret, the cut fiber-forming polymer is separated into a number of fibers. This can be suitably carried out by using a forming apparatus for producing a fiber bundle having a taking-off means for forcibly taking off the fiber bundle as a trickle. The present invention will be described in detail below with reference to the accompanying drawings. FIG. 1A is a top view of a plain-woven wire mesh that is an example of a mesh-like spinneret used in the present invention, and FIG. 1B is a cross-sectional view of the same spinneret. FIG. 2A is a partially enlarged top view showing another example of a spinneret used in the present invention made by etching a metal plate, and FIG. 2B is a partially sectional view of the same spinneret. FIG. 3 is a partially enlarged perspective view of a lattice type spinneret, which is still another example of the spinneret used in the present invention. FIG. 4 is a schematic sectional view showing an example of a compression molding machine for molding a molded article from powder to be used in the present invention. FIG. 5 is a schematic explanatory view, partially in section, showing an entire apparatus of the present invention for carrying out the method of the present invention. FIG. 6 is a perspective view for explaining the form and dimensions of the molded article used in the present invention in relation to the form and dimensions of the die passage entrance of the apparatus of the present invention. 7th
The figure shows three examples (7-
1,7-2°7-3). Figure 8 shows that the passage of the molded product in the die has three zones (Ct, C
t. FIG. 6 is a cross-sectional view of a die in the device of the present invention consisting of C, ), and is a diagram showing another example different from FIG. 5. FIG. 9 is a scanning electron micrograph of the surface of the polymetaphenylene isophthalamide fiber containing aluminum and powder in Example 3. The spinneret used in the present invention has a large number of closely spaced slots. The large number of pores is expressed by the fact that the porosity (α) defined by the following formula, which represents the ratio of the total area of all pores to the spinning surface of the spinneret, is at least 30%. The shape of the slit in the spinneret used in the present invention or the shape of the partition member that defines the slit is not limited. For example, the shape of the slit may be circular, oval, triangular, quadrilateral, hexagonal, or other polygonal shape, and the partition member may have irregularities. The spinneret used in the present invention is
Preferably, the partition member has a slot having a circular, triangular, square, or hexagonal shape; can be. FIG. 1A of the accompanying drawings illustrates a typical example of a multi-slit spinneret for use in the present invention. The illustrated spinneret is a plain weave wire mesh. Figure 1B shows A.
A cross-sectional view of the wire mesh is illustrated. In the plain weave wire mesh shown in FIG. 1, the slits I have a rectangular shape, and the partition members are made of thin wires. As is clear from B, this plain woven wire mesh has a concave portion in the partition member between the adjacent narrow gaps. FIG. 2A of the accompanying drawings illustrates another example of a spinneret for use in the present invention. The illustrated spinneret is an etched perforated plate in which a large number of slits are formed in a thin metal plate using a precise etching technique. In this etched perforated plate, the slits form a tri-oval, and as is clear from the cross-sectional view illustrated in FIG. 2B, the partition portions existing in the adjacent slits do not form recesses. In this die, the partition member has a knife shape to facilitate plasticization and division of the polymer. FIG. 3 of the accompanying drawings illustrates another example of a spinneret used in the present invention as a perspective view. In the illustrated spinneret, the slot A has a rectangular shape, and the partition member opening is in the form of a thin plate with its largest area facing the fiber-forming polymer as it passes through the slot. This die can provide great strength even if it has a large porosity (α). The spinneret used in the present invention may also be a twill wire mesh. A part of the spinneret used in the present invention is
It is disclosed as a mesh-like spinneret in the specification of Japanese Patent Application No. 6-140110 (Japanese Patent Application No. 55-38993). In the following formula that defines the porosity (α) in the spinneret used in the present invention, the pores of the spinneret are the portions of the spinneret that have a large number of small holes. In the above formula expressing the porosity (α), Va is the total volume under the m-order area (ICnt) of the mesh-like part of the spinneret, and vf is the unit area (1d) of the mesh-like part of the spinneret. ) is the total volume occupied by the partition member surrounding the gap below. As can be seen from the illustrations in Figures A and B of Figure 1 of the attached drawings, if an imaginary surface is assumed to be in contact with the front and back surfaces of the cap, it will be narrowed between these two imaginary surfaces of unit area. As the volume of the part above, the above apparent total volume (Va)
be defined. If the unit area is 1 d, Va is equal to D. Similarly, in FIG. 2 of the accompanying drawings, the volume (Va) of the portion narrowed by the two 1- virtual planes is equal to D. Therefore, in order to determine Va for an actual spinneret, Va can be easily determined by measuring the thickness of the spinneret using a part of the dial having a contact surface of 1L:i. Further, in order to determine Vf for a certain spinneret, K can be determined by cutting the spinneret into a predetermined area and, for example, measuring the increased volume when the cutter is immersed in a liquid such as water. The value obtained by converting this increased volume per 1 d of spinneret is Vf. According to the present invention, the porosity (α) is expressed by the following formula as described above, so when determining Va and Vf, if 1d of the spinneret is used as a reference, the value that balances Va is as shown in FIG. 1B and As illustrated in FIG. 2B, it can be seen that the value represents the thickness D) of the spinneret. The spinneret of the present invention preferably has a porosity of about 40 to about 95 parts. If the porosity α is too small (less than 3o%),
Not only does the resistance increase when the fiber-forming polymer is instantaneously plasticized and divided by a partition member that defines a large number of slits, but also the contact time of the heated partition member with the fiber-forming polymer Y increases. However, it becomes difficult to mold polymers that are easily thermally decomposed. Regarding the upper limit of the porosity α, there is no particular limit to t (However, in consideration of the strength of the die and the prevention of re-fusion after plasticization and separation, it is set to 9.
It is desirable to set it to 5 sections or less. The spinneret used in the present invention has an area of 1
Preferably 1 per d, more preferably about 5 to about to
It has a pore size of 0.0 mm, particularly preferably about 10 mm to about 500 mm. When using an existing stainless steel wire mesh as the spinneret of the present invention, it is preferably 5 to 80 meshes, more preferably 8 meshes.
~60 mesh is used. The thickness of the forming area in the spinneret of the present invention is approximately 110 f.
f1 or less, preferably about 0.1 mm to about 5 rnm. More preferably about 0.2 mm to about 2 mm. A current of usually 0.1 to several hundred amperes is passed directly through the spinneret, or an electric current of 0.5 to 500 amperes per d of the spinneret is passed through the spinneret.
An amount of electricity of 0 watts is applied. The spinneret of the present invention needs to be made of a conductor in order to conduct electricity and generate Joule heat. For example, platinum, copper, titanium, and tungsten. Single metals such as iron, nickel, and chrome, and alloys such as stainless steel, nichrome, and brass 2 can be used. Appropriate resistance (10 to 100 μρ box) and high melting point (10
Stainless steel and nichrome are preferable materials that comprehensively have a low coefficient of thermal expansion, high strength, workability (2), etc. The method of the present invention is as described above (porosity of a3096 or more (α
) continuously forcing at least one fiber-forming polymer as a molded article into a die equipped with a spinneret having a number of slits specified by This is carried out by cutting the fiber-forming polymer using the partition member. According to the method of the present invention, polymers that are conventionally known to be able to be made into fibers by melt spinning can be used because their decomposition point is close to their melting point or their degree of polymerization is extremely high, making it difficult or impossible to conventionally melt spin them. Polymers that were considered possible can also be targeted. In other words, according to the present invention, polymers such as polypropylene that can be formed into fibers by conventional melt spinning methods, as well as polymers that have a thermal decomposition point close to the melting point or have a molecular weight such as polymetaphenylene isophthalamide, can be used. Fiber bundles are made from polymers that are conventionally considered difficult or impossible to melt spin due to their ultra-high viscosity, such as polyethylene with an intrinsic viscosity of 1,000,000 or more, or fully aromatic polyesters with an intrinsic viscosity of 4 or more and exhibiting melt anisotropy. Be able to manufacture. Furthermore, even for polymers such as polyvinyl chloride, whose thermal decomposition point is significantly lower than the melting point and is considered difficult to melt instantaneously, only the necessary portions can be processed using the heated partition member in the spinneret. Since it can be instantaneously heated and plasticized and fragmented, it can be made into a fiber bundle simply by coexisting with several plasticizers. , for example below (
1) ~ It's a spider's street. (1) Polyolefin or polyvinyl polymer:
For example, polyethylene, polypropylene, polybutylene,
Polystyrene, polyvinyl chloride. Polyvinyl acetate, polyacrylonitrile, polyacrylic acid ester, or mutual copolymers thereof. (11) Polyamides; aliphatic polyamides such as polyε-caprolactam, polyhexamethylene adipamide, polyhexamethylene sehacamide, and aromatic, 15-lyamides. The aromatic polyamide preferably contains at least 50 moles of at least one repeating unit selected from units derived from aromatic dicarboxylic acids, units derived from aromatic diamines, and units derived from aromatic aminocarboxylic acids. More preferably, those containing at least 70 mol are used. In particular, those consisting qualitatively of units derived from aromatic dicarbons and units derived from aromatic diamines are preferably used. Preferably, the unit derived from an aromatic dicarboxylic acid is represented by the following formula % (where R is a divalent aromatic residue):
The unit derived from an aromatic diamine is represented by the following formula NH-R'-NH-) (where R' is a divalent aromatic residue),
The unit derived from aromatic aminocarboxylic acid is represented by the following formula % (where R'1 is a divalent aromatic residue). The units derived from the above aromatic dicarboxylic acids, aromatic diamines and aromatic aminocarboxylic acids are carbonyl groups (-C
O-) and amide 7 group 1-NH-) are present so as to be approximately equal. Examples of the divalent aromatic residue in the above formula include a paraphenylene group and a metaphenylene group. 1.5-naphthylene group, 2. G-naphthylene group. Examples include a 3.3'-, 4,4'- or 3,47-diphenylene group, and a 3.3'-, 4,4'- or 3.4'-diphenyl ether group. The aromatic polyamide used in the present invention may contain units other than the units derived from the above-mentioned aromatic carbonic acids, aromatic diamines, and aromatic aminocarboxylic acids, such as R and R' in the following formula. and R'' can be changed to a group used in the field of divalent aliphatic residues, such as aliphatic polyamides such as tetramethylene, pentamethylene, and hexymethylene. Specific examples of such aromatic polyamides include polyvara phenylene phthalamide, polyvara phenylene phthalamide, polymetaphenylene terephthalamide, poly-1,5-
Examples include naphthylene isophthalamide, poly-3,4'-diphenylene terephthalamide, and copolymers thereof. Among these, polymetaphenylene inphthalamide and the like are preferred. 1:i+ Polyester: Aromatic dicarboxylic acids such as phthalic acid, inphthalic acid, terephthalic acid, diphenyldicarphonic acid, naphthalenecarboxylic acid; Aliphatic dicarboxylic acids such as adipic acid, sepatic acid, decanedicarboxylic acid; or hexa Ethylene glyfur is produced by using an alicyclic dicarboxylic acid such as hydroterephthalic acid as a dibasic acid component. Propylene glycol, trimegulene gellicol, tetramethylene glycol: I-ruadecamethylene glycol,
Diethylene glycol. 2. Aliphatic glycols such as 2-dimethylpropanediol, hexahydroxylylene glycol IiN
A polyester or a wholly aromatic polyester having a glycol component containing an aromatic aliphatic glycol such as a cyclic glycol or xylylene glycol, or an aromatic dihydroxy compound such as resolunol or noid Ij-non. These polyesters or wholly aromatic polyesters may also contain a component of oxycarboxylic acid such as, for example, P-ochynebenzoic acid. Any of the above dibasic acid components or glycol components may be contained in the above polyester or wholly aromatic polyester in the form of one or two types υ. Particularly preferred examples include polyethylene terephthalate,
Polytetramethylenenaphthalate 1-, polytrimethylene 1/phthalate, U.S. Pat. No. 3,763,109, U.S. Pat. No. 3,023,192. 7-1 polyester elastomer described in U.S. Pat. No. 3,651,014 and No. 3,766,146, or U.S. Pat. (136,, Q 9 (No. 1, No. 3)
．． Q 36,991 and Q 3,637,149'
This is a wholly aromatic polyester described in the specification of No. 5. QVI Other polymers In addition to the above-mentioned polymers (1) to ft1t), polycarbonates using various bisphenols; poly-1 cetal; polyurethane for each electrode; polyfluorinated ethylene, polytrifluorochloroethylene

[ ; polyvinylidene difluoride, polytetrafluoro-ethylene-propylene hexafluoride 1/n copolymer, polytetrafluoroethylene-perfluoroalkyl vinyl ether-ethylene copolymer, polytetrafluoroethylene-ethylene copolymer, polyvinylidene difluoride Examples include polyfluorinated ethylene-propylene copolymer, polyfluorinated beef+, rI; trifluoride chloride ethyl chloride 1/n-ethyl chloride copolymer, and the like. In the method of the present invention, such a ta fiber-forming polymer is molded into a molded article. The shape of the molding direction is also a shape having a dimension that is much larger than the dimension in the other direction. Such a shape may be, for example, a flat plate, a dollar shape, or a film product. Such a molded article can be produced, for example, by pressing and molding a polymer powder, or by melt-molding a polymer. When the polymer has a melting point close to the decomposition point, such as aromatic polyamide, a method is adopted in which the polymer powder is compression molded to obtain a molded product. If the moldable material is moldable, the molded product can be molded by either compression molding or melt molding. Compression molding can be carried out using, for example, a mold having the cross-sectional shape shown in FIG. 4 of the accompanying drawings. A predetermined amount of fiber-forming polymer Po (preferably powder) is put into a female mold U, and then compressed with a mold T passed through L- to obtain a molded product having a desired compressive strength. In FIG. 4, a molded product having an elongated rectangular cross-sectional shape is obtained. The compression pressure varies depending on the shape and size of the polymer or the desired compressive strength, but is usually at least 11/'ffl, preferably 1 to 1 ookg/'ffl.
It can be cy&. Heating the polymer during compression is often preferred because molded articles having the desired compressive strength can be easily obtained at lower compression pressures. Such heating may be carried out by heating the mold in a manner known per se. According to such a compression molding method, a molded article can be formed by mixing powders of two or more different hem-forming polymers. Furthermore, a molded article can be prepared by mixing other additives with the powder of at least one hem-forming polymer. Additives include light stabilizers, pigments, heat stabilizers, flame retardants, or lubricants. The object is anything that can provide some function to fibers, such as inorganic or metal fine powders such as abrasive grains, or fibrous materials. Even if these additives do not melt at the temperature of the spinneret, it is sufficient that they have a size that allows them to pass through the slits of the spinneret used in the present invention. Examples of inorganic or metallic fine powders or fibrous materials are described with reference to very thick aromatic polyamide fibrous rods containing them. According to the method of the present invention using a fiber-forming polymer as a molded article, the additives can be easily mixed, a large amount of additives can be mixed uniformly, and the mixing of a large amount of additives makes it possible to mix the additives in a way that is not possible with conventional methods. It is possible to outperform fibers containing a large amount of additives, such as those that could not be obtained. For example, according to the method of the present invention, even hard particles such as abrasive grains can be mixed at a slightly higher mixing ratio without any mixing troubles, and fibers can be obtained in which the mixed state of the molded product is unchanged.0 Melt molding is applied to polymers produced by melt polycondensation reactions, such as polyethylene terephthalate. A molded product that can be used in the present invention can be obtained by directly extruding after the completion of polycondensation. The molded product used in the method of the present invention is not one that easily collapses when compressed. As will be described later, such performance is achieved by at least the initial pressure of the molding device that is pressed into the die of the molding device for manufacturing the fiber bundle. This means that it has compression resistance that maintains the shape of the tube. It is preferable to form the tie in advance and supply it to the tie.For example, if the cross-sectional shape of the passageway in the tie is an elongated rectangle, it is preferable to use a flat plate with a cross-sectional shape that almost matches the elongated rectangle.In this case, the flat plate noj
The length corresponds to the length of the shorter of the four sides of the elongated rectangle (cross-sectional shape) of the tie passage. Therefore, it will be easily understood that the flat plate can be used as a single plate or in a stack of two or more plates. Similarly, the film is supplied as a laminate to the tie passage, and the rods are packed in a shape that can be supplied to the die passage, with the length direction being in the direction of the die passage. , it will be appreciated that the passageway can also be fed. The important points about the molded product used in the method of the present invention are:
When the molded product is initially pushed into the die, it has at least compression resistance that allows it to substantially retain its shape against the indentation pressure. Therefore, even if the molded product is pressed into a die, it may collapse immediately. When feeding the die as a powder mixture, the indentation pressure is dispersed within the passage, and it often happens that not even a part of the indentation pressure reaches the spinneret surface.If this is to be prevented, very high Indentation pressure is required, but even if a very high indentation pressure is used, the powder will not be fed smoothly and problems such as thread breakage will occur.As mentioned above, in the method of the present invention, the porosity (α
) is at least 30 qI), which allows for a very high throughput for the spinneret, unlike when using a conventional spinneret with a very small porosity (α). It is possible to cut the liquid into a small stream by the partition member defining the narrow gap without the need to apply pressure.
Therefore, according to the method of the present invention, it has become possible to convert the polymer into fibers by simply pressing the polymer into a molded body continuously into a tie. And 1. As explained above, what is required of the molded product is that it has compression resistance that substantially retains its shape when it is initially pushed into the die, and that the indentation pressure is reduced in the indentation direction. (This means that it can be spread smoothly to other countries). The compression molded articles used in the present invention preferably have a true density, i.e. 0.3 of the average true density of the material forming it.
It has an apparent density of ~0.95 times. Here, the average true density ρ is expressed by the following formula, where xl is the subodd fraction of a substance, and the substance'1
When v4 in wi is expressed as wi, it is defined by the following formula. ρi is the true density of the certain substance. Defined by However, the compression molded product used in the present invention has the following formula, where Va is the apparent volume of the molded product, Vi is the true volume of a substance constituting the molded product, and wi is the following formula: is the weight of the material and ρi is the true density of the material. It can also be expressed by the filling factor defined by (coefficient), and preferably has a filling factor value of 30 to 95. The compression molded product used in the present invention particularly preferably has an apparent density that is 0.5 times or more the true density, or in other words, a filling factor of 50 or more. In the method of the present invention, a fiber-forming single-unit molded product as described above is forced through a passage in a die, and a constituent component of the molded product (hereinafter simply referred to as a polymer) is introduced into a spinneret provided in addition to the passage. the partition member defining the slit of the spinneret is energized with sufficient electricity to provide the Joule heat necessary to shred the polymer, and the shredded polymer is streamed into a trickle. This is done by picking up the item. Hereinafter, the present invention will be further explained in detail with reference to FIG. and by two sets of 1-pair σ-lars 3, which are pushing means, ゛C
Be supplied. This 110-roller has a soft rubber surface and firmly grips the plate-shaped molded products while continuously pushing them into the die 4 one after another. In the example of the 1π5 diagram, there are two pairs of rollers as the pushing means. The number of rollers may be determined as appropriate depending on the required pushing force. In addition to the at least one pair of rollers as shown in FIG. 5, the pushing means may be at least one pair of belts that sandwich the molded product between the upper and lower sides. Since such a pushing means is employed, the molded product applied to the present invention can withstand the gripping pressure of a pair of rollers or a pair of belts, and resists the pushing pressure of C at least initially when it is pushed into a die. It is necessary to have enough pressure resistance to substantially maintain its shape, and therefore, the shape of the vertical cross-section in the pushing direction should almost match the cross-sectional shape of the entrance of the die passage, and the area should be less than the same. is necessary. As shown in FIG. 5, the path of the die into which the molded article 1 described above is pushed is substantially straight from the inlet to the spinneret 5 which is electrically connected to the tip. Preferably, the passage of the die has an elongated rectangular cross section in a direction perpendicular to the direction of passage of the molded article. Additionally, the passageway may have substantially the same shape and size from the inlet of the molding to the spinneret; Can it monotonically expand gradually from the beginning or middle, or can it expand and then contract? In Figure 5, the passage is 2. , 2. and Z. C, , C, which are respectively determined by the first cock. It consists of three zones: C1 and C1. In the C1 zone, the passages are essentially the same shape and size, and C
In the ,zone, the passage gradually expands into a water bottle, and in the ,C,zone, the passage expands further than in the ,C,zone. The passage in FIG. 5 is a passage that gradually expands from the slot of the molding toward the spun 1-1 gold. The tie in the present invention preferably includes a heater to preheat the polymer passing through the passage. In FIG. 5, the heaters are designated H, , kiffi and Hl. One of the advantages of preheating the polymer in the passage of step 1 is that it defines the large slits of the spinneret 5, and a. The goal is to reduce the amount of heat energy and energy supplied from the partition member to make cutting smoother. For example, if we take a case where it is necessary to heat the polymer to 300°C in order to plasticize and cut it,
Rather than providing the heat necessary to heat the polymer to 300°C solely through the spinneret partition, it is possible to
Even if thermal decomposition starts at a temperature lower than 00°C, for example 200°C, it is preheated to a temperature at which thermal decomposition does not start, for example 180°C, and the remaining heat necessary for cutting is supplied by the partition member. That is a good thing. Another important advantage of preheating the polymer in the passageway is that the voids can be easily removed during passage through the passageway from moldings with a fill factor of less than 100 cm, i.e. moldings with voids. be. According to the research of the present inventor, if the polymer is completely melted from a molded article having voids by simply heating it with a partition member of a spinneret without preheating, and if the slowly cut stream is taken up, It has been found that withdrawal can be continued, but only a shredded stream containing air bubbles is obtained when increasing the withdrawal speed. On the other hand, when preheating the polymer passing through the die passage as described above, preferably, when the die passage is gradually raised from the inlet toward the die to preheat the polymer to a temperature near the softening point, for example, The filling rate of the polymer in the passage of the die gradually increases from the entrance of the passage toward the die, and by the time the polymer reaches the die, there are substantially no voids (the filling wheel reaches approximately 100 mm). It has been found that a bubble-free stream can be drawn off smoothly. As is clear from the above description, the gas contained in the molded object does not escape in the direction in which the molded object is pushed into the passage of the die, but is discharged in the opposite direction to the pushing direction, that is, toward the entrance of the passage. It is. Such gas exhaust is
When the passage of the die gradually expands toward the die as described above, or has an enlarged portion in the middle,
That is, if the polymer can be easily softened and compressed within the passage, the process will proceed very smoothly. The polymer that has reached the spinneret 5 provided at the other end of the die passage receives enough heat (Joules, heat) from the partition member of the spinneret to be cut by the partition member, and is thereby plasticized. and cut. The spinneret 5 has, for example, 10 spinnerets.
It is connected to a 0v or 200v power source (not shown), and the amount of current supplied is adjusted by a variable resistor (not shown). The polymer is rapidly plasticized from the point where it comes into contact with the partition member defining the slit of the mouthpiece, and is cut and extruded to the size of each slit by the pressure of the partition member. The shredded polymer stream is withdrawn. The withdrawal is forced at a rate greater than the extrusion rate of the polymer. A pair of rotating rollers 6 in FIG. 5 is sufficient to perform such take-off. Such withdrawal is expressed by the following formula, where vr is the withdrawal speed (cm/min), So is the area of the die forming area (,ffl), and Vo
is the filling rate of the molding to be converted into fibers per minute 1
This is the true volume (cyVmin) in terms of 00 cycles. The appearance represented by is performed such that the draft is at least 1 and preferably at least 10. In the method of the present invention, the vicinity of the discharge surface of the spinneret can be cooled by means 7 as shown in FIG. For polymers whose melting point and intrinsic viscosity are below, it is extremely important to cool the vicinity of the spinneret discharge surface to hasten the solidification of the cut polymer stream and prevent re-fusion. It is valid. Summary of the above! As is clear from the figure, the present invention improves the forming system by processing the polymer, which is the raw material for the fiber bundle, into a certain molded product in advance and giving this molded product a role similar to a plunger. are doing. The role of a plunger for this molded product is given by a pushing means such as a spacer, so that at least initially when it is pushed into the die, it can self-sweep like a rigid plunger and is resistant to compression. It must possess both gender and form. In the present invention, the force required to extrude a molded product from 1" gold, that is, the pushing force (Fp), is the sum of the back pressure CF of the die, the internal frictional resistance during softening and compression of the molded product, and the external frictional resistance with the die passage wall. (F4). Therefore, the molded article must have a pressure resistance sufficient to withstand at least a pushing force of F, +F4, while the pushing means must have the ability to generate a pushing force that is sufficiently greater than F, +F4. According to the detailed study results of the present inventors, the back pressure F of the cap,
2 types of cap 2 amount of current 2 types of polymer. The frictional resistance F4 depends on the extrusion speed, etc., while the frictional resistance F4 is substantially dominated by the external frictional resistance, which depends on the length of the passage in the die, changes in thickness, die temperature, type of dipolymer material of the passageway wall, etc. It was revealed that the internal frictional resistance that accompanies the deformation of the molded product is not substantially controlled. It is ideal to carry out the present invention while minimizing the pushing force Fp, both in terms of energy saving and in terms of expanding the range of applications for molded products. For this purpose, it is most effective to provide an enlarged zone in the passage within the die as shown in FIG. Preferably, the passage walls are treated with fluororesin, pear plating, ceramic, etc.
The coefficient of friction should be made as low as possible. Furthermore, when preheating the molded product, rapid temperature rise should be avoided to prevent adhesion between the molded product and the die passage. If no measures are taken to reduce the frictional resistance F4, the frictional resistance F4 will be 5 to 10 times the back pressure of the cap (
F4 = 5F, ~10Fa) can reach F4 = 5F, ~10Fa), but if you take effective measures, F, F, F! It can also be less than l/10 (F, <-“1),
Further, F can be substantially the same as F (F4÷F). According to the measurement results of the mouthpiece back pressure F, under various conditions, F is 1 to 20 kglcrl (1 kg/a
It was found that n<F, <20 kglcrl). Therefore, it is necessary for the molded article to preferably have a compression resistance of at least 1y/ffl, particularly preferably 2o/ffl.
It should have a compression resistance of ky/crl. In addition, as a pushing means for applying a pushing force of Fp to the molded product,
When using a pair of rollers as shown by 3 in FIG. 5, the gripping pressure (Fl) of the rollers must be within the pressure resistance of the molded article. The maximum pushing force F of a pair of rollers is limited by the friction coefficient μ between the rollers and the molded object and the gripping pressure F of the a-lar, and F, < 2μ
Since the relationship F1 is satisfied, in order to obtain the pushing force pp necessary for fiber forming according to the present invention using a plurality of pairs of rollers, it is necessary to set the number of pairs of rollers NR such that NR>Fp/2 μF. As for the device, it is preferable that the number NR of pairs of rollers is small from S, and for that purpose, a material for the rollers with a large μ should be selected. According to the study results of the present inventors, it has been revealed that a soft gono having a hardness of 40 degrees to 70 degrees is preferable. Further, a preferred form of the indentable molded product in the present invention is a plate-shaped rectangular parallelepiped as shown by 1 in FIG. For the plate-shaped rectangular parallelepiped, the dimensions of the entrance of the die passage are d and el as shown in the figure, and the dimensions of the molded product are mln as shown in the figure.
Then obviously m! It is necessary to satisfy dB and nle. The molded article can take various other forms. For example, as shown in 7-1 in Figure 7, films or thin plates are laminated in a rectangular parallelepiped shape to match the entrance dimensions of the die passage, and as shown in 7-2 in Figure 7, they are mutually stacked in the pushing direction. It may also be a plate-shaped body having a concave portion and a convex portion that can be combined with each other, or a plate-shaped body in which rod-shaped bodies are arranged in the pushing direction in the shape of a plate-shaped body as shown in 7-3 of Fig. 7. It goes without saying that even with these shapes, it is necessary to satisfy the relationships m≦d and n≦e, as described with reference to FIG. There is no particular restriction on the length of the molded product in the indentation direction. The longer the length, the more bending flexibility the molded product is required to have. The most preferable molded product when the length is long is No. 7
It is a laminate of films or thin plates as shown in Figure 7-1. As mentioned above, the shape of the die passage in the device of the present invention is such that the molded article receptacle can be substantially linear from the inlet to the spinneret, and the molded article receptacle can be substantially linear from the inlet to the spinneret. The passage may monotonically expand from the beginning or the middle of the passage in the direction of the cap, or may expand and then contract. The shape of such a passage may depend on the filling rate of the molded product or the properties of the polymer forming the molded product, so that the air contained in the polymer forming the molded product can be removed before reaching the spinneret. has an important meaning for. For example, when using a molded product with a filling factor of about 50 obtained by compression molding a powder of polymetaphenylene isophthalamide (PMIA) with an intrinsic viscosity of about 1, the temperature of the passage in the die should be adjusted to avoid thermal decomposition of the PMIA. In order to compress the temperature below 350℃ without any
A compression pressure of kg/ail is required. In order to dynamically transmit such compressive pressure to the polymer present in the vicinity of the spinneret through the molded product outside the die, it is preferable that the passage of the die is such that the molded product receptacle is directed from the inlet toward the spinneret. The passage (.) is monotonically expanding from the middle of the passage. For example, as illustrated in FIG. (C7) and a third gradual but further expanding enlargement (C5).
In order to make the molding field function as a rigid plunger, the first zone is equipped with an FC stopper that heats the molded product to a temperature of, for example, about 250°C, which is lower than the glass transition point of PMIA (approximately 260°C). In the second zone, heat is applied to the temperature at which PMIA begins to soften (approximately 300°G) to aid compression and promote evacuation, and in the third zone, it is heated to the temperature at which PMIA begins to decompose (approximately 350 = Q). Then, compress it to a sufficient pressure and exhaust it. On the other hand, when using a molded product of a melt-formable polymer such as polyethylene terephthalate, which has an intrinsic viscosity of 1 or less unlike PMIA, the back pressure F of the die is sufficient to remove the air contained in the molded product in the passage. Since it is often smaller than the required softening compression force, in such cases, the back pressure l・,
In order to increase
The second zone (C7) following C,) is expanding,
And the third zone (C3) that follows it is shrinking. The heating of the extruded polymer (1) in the tie passage is carried out as described above, preferably at a higher temperature as it approaches the spinneret. In this way, the present invention does not change the physical properties of the polymer in the tie passage into a melt state, but rather maintains it in a temperature state intermediate between a melt and a solid, that is, between the melting point and the glass transition point. ? This is an industrially extremely advantageous method for forming a fiber bundle into a state called leather-like or rubber-like in terminology, and instantaneously bringing it into the necessary plasticized state near the spinneret. This method also uses composite fibers from dissimilar polymers,
Alternatively, it also exhibits great characteristics in the molding of composites made from polymers and other additives. That is, according to the present invention, since the mixed state of different substances in the molded article is directly reflected in the fibers, composite fibers, which were previously difficult to manufacture due to reactions between polymers, can be produced very easily. ! Can be built. For example, y-? By using a molded product made of a laminate of lume, a composite fiber having a striped pattern on the cross section IR1 can be easily molded! - Molded products made by mixing granular polymers and powdered inorganic powders are free from troubles (for example, troubles caused by reactions) that occur during the melting process, and contain a high mixing ratio of inorganic powders. A mixed fiber containing . The method of the present invention can be carried out regardless of whether the normal vector of the ejection surface of the spinning gold is in the direction of gravity, in the opposite direction of gravity, or in the direction of gravity and the ilX angle direction (horizontal direction). Be able to do it. In other words, the method of the present invention makes it possible to extrude the polymer and take off the fiber bundle from the spun gold discharge surface, regardless of the orientation of the discharge surface. Therefore, it should be understood that the die in the present invention includes dies positioned as described above as well as the dies shown in FIGS. 5 and 8, which are positioned perpendicular to gravity (horizontal direction). However, when the die is arranged horizontally as shown in Figures 5 and 8, the molded product is pushed horizontally into the tie, and four fiber bundles extruded from the spinneret are taken along the same direction. This has the advantage that the feeding of the molded product to the die and the feeding of the taken-off fiber bundle to the next process can be carried out very advantageously industrially. By applying the method of the present invention described above to aromatic polyamides, according to the present invention, it is possible to obtain an average cross section comprising at least one fiber-forming aromatic polyamide and an inorganic or metallic fine powder or fibrous material. Area approximately 0.01~
A novel extra-thick aromatic polyamide fiber of about 5- is provided. Conventionally, aromatic polyamides were simply melted in a solvent to prepare a spinning dope, and this dope was converted into fibers by wet spinning. Therefore, even in fibers made of aromatic polyamide alone, only fibers with a diameter of about 10 delta are known to be burned. Very thick aromatic polyamides containing inorganic or metal fine powders or fibrous materials and having an average cross-sectional area of about 0.01 to about 5 - have not only been previously unknown, but also have been produced using the conventional σ) wet spinning method. Depending on the pressure, it can be manufactured
It's ugly. The above-mentioned textile aromatic polyamide fiber of the present invention! The kasuri-forming aromatic polyamide forming 1t has already been described above. Fiber-forming aromatic poly? The compound preferably contains at least 50 moles of at least one repeating unit selected from units derived from aromatic dicarboxylic acids, monocrystalline units derived from aromatic diamines, and units derived from aromatic 7-minocarboxylic acids; Preferably, the content is at least 70 molar. More preferable. The fiber-forming aromatic polyamide essentially consists of units derived from aromatic dicarboxylic acids and units derived from aromatic diamines, and is particularly preferably polymetaphenylene isophthalamide. The ultra-thick aromatic polyamide fiber of the present invention preferably contains an inorganic or metal fine powder or fibrous material in an amount of about 1 to 100 volume parts, more preferably about 2 to 50 volume parts based on the aromatic polyamide. be able to. Here, the volume is defined as the true volume of the aromatic poly-11 amide (its weight divided by its true density) and the true volume of the inorganic or metal fine powder or fibrous material (its weight divided by its true density). (value divided by its true density). Examples of the inorganic or metal fine powder or fibrous material forming the ultra-thick aromatic polyamide fiber of the present invention include calcium carbide, titanium oxide, kaolin, clay, talc, diatomaceous earth, potassium titanate, feldspar, mica, and glass powder. Or fiber, graphite fiber, carbon black, molybdenum disulfide, metal powder (e.g. copper powder, aluminum powder, iron powder, chromium powder, nickel powder), r-Fe103. Examples include silicon carbide, alumina, zeolite, and ceramic materials for sintering. It goes without saying that these fine powders or 4a #-like materials are appropriately selected depending on the intended use of the very thick aromatic polyamide fibers containing them. For example, when used in polishing brushes, hard materials such as silicon carbide and fused alumina are preferably used. As the fine powder used in the present invention, for example, at least 2
It is preferable to have a particle size that passes through a sieve with a 0 tyler mesh, and more preferably a particle size that allows it to pass through a sieve with a 500 tyler mesh. The particle size for dogs is usually about 50,000 tira and one mesh. The fibrous material preferably has an aspect ratio of about 5 or more, and further has a minimum area of 1 + nw7 to 2,
5 X 10-' rnIIP, more preferably 2.5
×IQ-37~2,5 X 10-711$ range 817
) is also used for Tsuka. Its length is usually 5 mm ~ o, o
o o s mm. Preferably it is in the range of 0.25 mm - 0,0005 axis. As mentioned above, these or inorganic or metal fine powders or fibrous materials are preferably used in an amount of about 10% based on the aromatic polyamide.
~100% by volume. If the amount of addition 1 is too small, the effect of the addition will be apparent, while if it is too large, the moldability will deteriorate and the retention of these additives by the aromatic polyamide will decrease (7, these additives may be missing). or aromatic polyamide fibers become prone to breakage.In order to increase the adhesion between these additives and aromatic polyamide,
These additives can also be used after being treated with a coupling agent or the like. The very thick aromatic polyamide fiber of the present invention produced by applying the method of the present invention described above usually has a non-circular cross-sectional shape in a direction perpendicular to the fiber axis. Other various characteristics regarding the form are disclosed in Japanese Patent Application No. 56-205227, for example.
The properties may be the same as those for the fibers disclosed in that patent. The ultra-thick aromatic polyamide fiber of the present invention containing inorganic or metal fine powder or fibrous material can be used for various purposes by taking advantage of the excellent mechanical properties obtained due to its extra-thickness. In particular, the present invention provides a brush made of very thick aromatic polyamide fibers. The length of the ultra-thick aromatic polyamide fiber in the brush provided in the present invention (hereinafter referred to as "f telegram") is, for example, 1 to 30 cfr, preferably 2 to 20 cfrL, more preferably 3 to 1 cfr. be able to. In general, when the cross-sectional area of the line drawing is large, it is preferable that the message be long, and when it is small, it is preferable that the message be long. Telegrams are scorching 8 Bending resistance 2 Repulsion 2 Resilience becomes stronger and plan song efficiency improves, but if the length is too short, the substrate of the brush may rub against the object to be cleaned when too much brush pressure is applied. This is not desirable. On the other hand, if the message is too long, the cleaning effect will be poor and the service life will be shortened. However, if the telegram is long, the brushes can be regenerated (brush cutting alignment), and the frequency of brush replacement can be reduced. The extremely thick aromatic polyamide fiber W forming the brush of the present invention has excellent bending resistance, 9 repulsion properties, and is characterized by providing a brush with good brushing efficiency even when the telegram is considerably long. The brush of the present invention has a ratio (filling rate) expressed as Sl/So, where So is the area of the region where the fiber bundles are actually flocked as a bundle, and 81 is the total cross-sectional area of the fibers flocked in that area. ) preferably satisfies the range of 0.1 s, 1 s, /s < 1.0, particularly preferably the range of 0.3 = S, /Soz O,9s. Various methods known per se can be used to implant the fibers into the substrate. For example, a method may be used, such as making a hole in the substrate and filling it with a fiber bundle, gluing the base of the fiber bundle, or recessing the base of the fiber bundle with a channel, and fixing the fiber bundle by bending both sides of the channel inward. The fibers can be flocked to the substrate, e.g.
Hair can be implanted in bundles, or in stripes (parallel or intersecting). In the calculation of the filling rate in section 61, So means the area of the root area of the bundles or streaks when the hair is implanted in the form of bundles or streaks, and the area of the voids between the bundles or streaks is Not included. The brush thus prepared can be used as is, or it can be attached to a roller or the like. Brushes used by attaching to the roll include channel type, desk type, half desk type, spring type,
U-shaped folding type. Brushes that can be in the form of a ring type or the like and that can be used as they are include, for example, standart brushes, twisted brushes, cylindrical brushes, and curly brushes. It can be in the form of a comp brush, a foil brush, etc. The brush of the present invention thus obtained has excellent heat resistance and excellent brushing efficiency, so it can be used, for example, for removing scale from the surface of high-temperature metals (cleaning stretching plates and stretching rollers, cleaning thin iron plates, etc.). It is suitable for use in areas where brushes made of conventional materials could not be used, such as cleaning of Furthermore, since the brush of the present invention does not easily reduce its flushing efficiency (it has good durability), it can be used for a long time and is economical even in general-purpose applications. In addition to the above-mentioned brushes, the ultra-thick aromatic boronamide fiber provided by the present invention can be used for heat resistance f) sound insulation materials, reinforcing materials,
It can also be used for heat dispersion materials, semiconducting materials, etc. The present invention will be explained in detail with reference to Examples below. The intrinsic viscosity in the examples is based on the formula. 1, V, = ln ηrel, 10.5 (however, 1
7Tel is 1 unit of 0.5 fi / 100 ml
It is the value obtained by dividing the viscosity of a solution at 25°C in a capillary viscometer by the viscosity of the solvent determined using the same viscometer. ) In the examples, "part" means "1 part by weight". Section also means heavy IT section. In addition, the average particle diameter in the examples is calculated from a photo taken using an optical microscope or an electron microscope. means diameter. Example 1 Using the method and apparatus of the present invention, a powder of polymetaphenylene isophthalamide (hereinafter referred to as PMIA) obtained by polymerizing metaphenylene diamine and isophthalic acid chloride at the interface of tetrahydrofuran/water was used. A fiber bundle was formed. This PMIA powder was a secondary agglomerate of fine powder, and as a result of microscopic observation, the average particle size was approximately 507 zm.The PMIA powder was dissolved in N-methylpyrrolidone.
L, 8 degrees 0.5.9 / 100 ml A liquid was prepared and measured using a capillary viscometer, and the intrinsic viscosity of this PMIA (1, V, ') was 1.0 Tetr + Ivy. In addition, in order to investigate the thermal properties of this PMIA,
When differential thermal analysis (DTA) was performed at a heating rate of 0°C/min, a melting start point was observed around about 400°C. On the other hand, thermogravimetric analysis (
When TG) was carried out, it was observed that the weight loss, which was thought to be mainly due to oxidative decomposition, started slowly around 350°C, and the decomposition progressed rapidly from around 430°C. Furthermore, in order to investigate the thermal compression characteristics of this PMIA powder, a compression test was conducted at 350°C using a plunger set compression tester, and the filling rate was 95 at approximately 2 kg/crl.
% to ioo%. From the above results, the spinning method for PMI A is as follows:
Using a device having the cross section shown in Figure 5, the temperature inside the die is gradually increased up to a maximum of 350°C toward the spinneret, and the filling rate of the molded material is gradually increased to about 100% by the time it reaches the spinneret. Temperature is 4 due to Joule heat caused by electricity.
It was decided to adopt a method of raising the temperature to around 00°C and instantaneously plasticizing and dividing it. The above PMIA powder was compression molded at 270°C using a compression molding machine as illustrated in FIG. m and n are each I 2 cnl,
It was molded into an N1 plate-like rectangular molded product of 0.95 cm and 9.5 ci and a filling rate of 60%. The pressure resistance of this molded product was about 50 Yu/crA. Using this molded material as a raw material, and based on the results of the preliminary experiment described above, a PMIA fiber bundle with a total denier of 90V5de and a single yarn average of 970de was obtained by installing 20 meshes of non-woven plain woven wire mesh in a device similar to that shown in Figure 5. Manufactured. The details of the manufacturing conditions are as shown in Table 1. The average single fiber strength of the obtained PMIANll is 1.2y.
/de elongation was 3o%, Young's modulus was 50 fl, /de. Although this fiber was an undrawn yarn, its Young's modulus was close to that of PMIA &f drawn yarn obtained by wet spinning. When this fiber was applied as a heat-resistant brush, it was extremely useful. Table 1 Example 2 Polymetaphenylene r-sophthalamide (I
) MIA) and alumina particles (average particle size 10 μm) were mixed in a ball mill at a weight ratio of 8:2, and PMI
A/AI and O8 mixed powder was prepared. When this powder was observed under a microscope, an average of 50 ltm of secondary agglomerated PM was found.
It was found that the IA became fine particles with an average size of 10 μm, and the mixing of PMIA and alumina (AI, O,) was very good. Next, this PMI A/Al2O mixed powder was heated to 270
Compression molded at ℃, filling rate 65%, pressure resistance 3okg/Ω
A large number of molded products of No. 1 were molded. This molded product is used as a raw material [7,
A total of 1,890,000 de is used to make an abrasive brush under the conditions shown in Table 2 by installing a plain weave stainless steel wire mesh on the mouthpiece of a device similar to that shown in Figure 5. A thick tenier fiber assembly having a yarn length of 3600 de (cut H#i m approximately 0.2+nJ) was produced. When the surface of the obtained fiber was observed with a scanning electron microscope, it was found that A
I, 0. It had a protruding shape on the surface, making it ideal as a polishing flan material. Practical test results of this fiber showed that it is an unprecedentedly useful heat-resistant abrasive material that combines the excellent heat resistance of PMIA and the high abrasive performance of alumina. Table 2 Example 3 Nine rolls of polyethylene terephthalate (PET) film with a thickness of 1 mm and a width of 9.5 cm are prepared 1-1 9 rolls are stacked and the thickness is m = 0.9'5 cm , as a molded product with a width n-9.5 degrees and a length g = 100 m.
An attempt was made to manufacture an undrawn tow with a total denier of 60,000 denier and a single yarn of 43 denier by attaching 30 meshes of Slanless woven wire mesh to a device similar to the one shown in the figure. The details of the manufacturing conditions are shown in Table 3, but when setting the conditions, the intrinsic viscosity of this PET measured at 35°C in orthochlorophenol was 0.65, the melting point was 265°C, and the moisture content was Particular attention was paid to the fact that it was 0.3%. Further, water vapor generated during the preheating process was removed by suction from the expansion zone Z2. The production of PET fiber aggregates under these conditions is extremely stable despite the adverse conditions where the moisture content of the raw PET is 0.3, and the intrinsic viscosity of the resulting fibers is 0.62, which is not very low. There was no temperature. The strength of the obtained fibers was 0.8jj/de. The elongation was 400%. Table 3 Example 4 Thickness 0.4. Thirteen rolls of polyethylene terephthalate (PBT) film each having a width of 9.5 mm and a sieve of 0.3 mm in width and a sieve of 9.5 mm in width were used. An attempt was made to manufacture and sell a composite fiber bundle of PET/PBT using an apparatus similar to that shown in FIG. 5, in which the fibers were laminated alternately to form a continuous molded product, and 40 meshes of plain weave sinless wire mesh were attached. The details of the manufacturing conditions are as shown in Table 4, but when setting the conditions, the intrinsic viscosity of PE'l' is 0.55. The melting point is 265°C, I5, and the intrinsic viscosity of PBT is 1.1.
It was taken into consideration that the melting point was 223° C. and that the moisture content of both polymers was about 3%. In addition, the water vapor generated during the preheating process is removed by expanding sheets 2. It was removed by suction. In addition, the spun fiber bundle was stretched 3.5 times as it was on a real plate at 130°C, and the drawn fiber bundle with a total weight of 12,000 de and a single yarn of 4.1 de was obtained (-). The strength of the fiber produced is 3.29/de
, the elongation is 30%, and the fiber has a good three-dimensional crimp (the number of crimp is 2).
0 co/mi). Table 4 Example 5 Ultra-high molecular weight polyethylene (He5tale manufactured by Hegist)
Using a compression molding machine as shown in Fig. 4, the powder of n'GUR412) was compression molded at 130°C, and the dimensions l, m, and n shown in Fig. 6 were 2 Cm and 0.95, respectively.
A large number of flat rectangular molded products with a diameter of 9.5 cm, a filling ratio of ε=50, and a pressure resistance of about 40/ci were prepared. Using this molded product as a raw material, a stainless steel lattice mesh spinneret with a thickness of 2 mm as shown in Figure 3 was installed in an apparatus similar to that shown in Figure 5, and a single yarn with a total denier of 270,000 d and a single yarn of 193 d was prepared.
A fiber bundle of e was manufactured. Table 5 shows the details of a. The fibers spun in this way were stretched 13 times in a 110"C air bath, with a total of 131,000 de and a single yarn of 15 de."
, 59/de, 6.2% high tenacity yarn was obtained. Table 5 Example 6 Nohydroquinone 5 in which the benzene ring is substituted with a 7-mil group
Powder of a wholly aromatic polyester having an intrinsic viscosity of 6.0 at 35°C was prepared by polymerizing 0 parts of terefucuric acid/50 parts of terefucuric acid/5θ parts of roseoxybenzoic acid in orthochlorophenol exhibiting melt anisotropy. Compression molded at 10°C, dimensions l shown in FIG. m and n are respectively ]2σ, 0.95cm, 9.
A large number of flat rectangular molded products measuring 5 cm were prepared. Using this molded product as a raw material, a mesoche-shaped cap made by etching a stainless steel plate as shown in Fig. 2 was installed in a device similar to that shown in Fig. 5, and a total denier of 730,000 de, single yarn 203 d was prepared.
A fiber bundle of e was manufactured. Details of the manufacturing conditions are shown in Table 6. The obtained fibers undergo oriented crystallization during the molding process and have a strength of 8.9/
de, elongation of 3.5%, Young's modulus of 3so, and 9/de. Table 6

[Brief explanation of the drawing]

Figure 1 shows the upper surface and cross section fB) of a plain-woven wire mesh, which is an example of a mesh-like spinneret used in the present invention, and Figure 2 shows another example of a mesh-like spinneret made by etching knobs on a metal plate. The second side is an enlarged view of part 1 and a cross-sectional view, and the third side is
The figure shows another example of a lattice-type mesh spinneret □
FIG. 4 is a cross-sectional view showing an example of a compression molding machine for molding fine powder used in the present invention, and FIG. 5 is an enlarged perspective view of the method and apparatus of the present invention. FIG. 6 is a perspective view for explaining the form and dimensions of the molded product used in the present invention in relation to the form and dimensions of the die passage population of the present invention, and FIG. The M8 diagram is a perspective view showing three examples (7-1, 7-2, 7-3) of the form of the molded product used in the invention, and is a diagram showing the shape of the molded product when the passage of the molded product in the die of the invention is divided into three zones. FIG. 9 is a cross-sectional view of a die showing another example different from FIG. 5, and a scanning electron micrograph of the surface of the polymetaphenylene isophthalamide fiber mixed with alumina of Example 2. 7-1 7-2 7-3 Figure 7

Claims (9)

[Claims] (1) A method for producing a fiber bundle by extruding at least one type of fiber-forming polymer through a mesh-like spinneret having a large number of pores, wherein the pores of the spinneret A3 (α) as defined in the text are using a die equipped with a mesh-like spinneret having a large number of closely spaced slits of at least 30 parts, at least one fiber-forming monomer is continuously forced into the die as an extrusion. The molded article has a compression resistance that substantially retains its shape against the pressing force at least when it is initially pressed into the die, and is very large compared to its dimension in one direction. the at least -n fibers having a shape with one direction having a dimension of 1,000, and to be cut into an nN mesh-like spinneret by a partition member defining a number of slits in the spinneret; extruding the molded product from the mesh-like spinneret while applying sufficient electricity to provide the Joule heat necessary for cutting the polymer, and collecting the cut fiber-forming polymer as a fibrous stream; A method for forming a fiber bundle, characterized by: (2) The method according to claim 1, wherein the fiber-forming polymer is gradually preheated toward the spinneret in a passage in the die leading to the spinneret. (3) The method according to item 1, wherein the molded product of the fiber-forming polymer is a compression molded product of a powdery polymer. (4) The compression molded product has a true density of 0.3 to 0.9
The method according to item 3, in which the apparent value of 5 times indicates the density. (5) The method according to item 1, wherein the molded product of the fiber-forming polymer is a melt-molded product. (6) The method according to item 1, wherein the compression molded product has a flat plate shape. (7) The method according to item 1, wherein the compression molded product has a rod-like shape. (8) The method according to item 1, wherein the compression molded product is a laminate of films. (9) The method according to the first aspect, wherein the compression molded product further contains, in addition to at least one fiber-forming polymer, an additive that can pass through the slits of the spinneret. al The above compression molded product weighs at least 1kg/c! 2. The method according to claim 1, having a compressive strength of . 09 It is made of a conductor that can generate Joule heat when energized and is equipped with a mesh-like spinneret at the tip having a large number of closely spaced pores with a porosity (α) of at least 30 as defined in the text, and is cut. a die having a passageway leading to the spinneret through which a molded form of the fiber-forming polymer is passed for supplying at least one fiber-forming polymer to the mesh-like spinneret; A pushing means for continuously pushing the molded product, and a pulling means for forcibly drawing the fiber-forming polymer cut by the partition member defining the numerous slits of the spinneret as a large number of fibrous rivulets. A forming apparatus for producing a fiber kasted bundle having means. a3 The apparatus according to clause 11, wherein the spinneret is a wire mesh. 12. The apparatus of claim 11, wherein the passageway of the α3# die is substantially straight from the mold receiving port to the spinneret. (14) The passage of the die has an elongated rectangular cross section in the direction perpendicular to the passing direction of the molded product.
Apparatus described in section. (I9) The passage of the die, which receives the molded product, expands monotonically gradually from the beginning of the passage or from the middle of the passage, from the inlet toward the spinneret, or expands and then contracts. The apparatus according to item 11, wherein the die has a heater for preheating the fiber-forming polymer passing through the passage. 12. The apparatus according to claim 11, wherein the means for continuously forcing the molded article into the passageway of the die is at least one pair of rollers. 12. The apparatus of claim 11. 09. The apparatus of claim 11, wherein the apparatus further comprises means for cooling adjacent the extrusion surface of the mesh spinneret.