JP2017155353A - Recycling polyamide tow for stretch-broken spinning and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyamide tow using material recycling polyamide as raw material and capable of obtaining stable operability and high quality sliver in stretch-broken spinning.SOLUTION: Provided is a polyamide tow for stretch-broken spinning obtained using material recycling polyamide as raw material, in which single fiber cutting elongation is 55% or lower, and a surfactant is adhered to the fiber surface.SELECTED DRAWING: None

Description

  The present invention relates to a polyamide tow for check spinning and a method for producing the same, in which polyamide fiber waste and polymer waste are material recycled and the obtained polyamide polymer (hereinafter, material recycled polyamide) is produced as a raw material.

  Polyamide staples with a fine single yarn fineness of 2.25 dtex or less and a relatively long fiber length such as 70 to 130 mm are significantly inferior in spinnability. However, there is a big problem that the quality of the sliver is deteriorated due to the occurrence of nep, and it is considered difficult to obtain a spun yarn with satisfactory fine count.

  On the other hand, there is check spinning as a spinning method aimed at improving the spinning property of fine fibers. This check spinning is a method of making a sliver directly while checking the tow, and from this sliver, bulky spun yarn, high strength spun yarn and the like are produced.

 This check spinning is generally used in acrylic fibers and polyvinyl fibers because a sliver with a relatively fineness and a long fiber length can be easily obtained. However, it is difficult to carry out check spinning for polyamide fibers and polyester fibers because of the relationship between the elongation levels of single fibers, and the check spinning has hardly been applied to these fibers.

 Then, in order to enable check spinning of polyester fiber, a method of improving checkability by reducing elongation has been proposed (Patent Document 1).

  In addition, industrial implementation of check spinning of polyamide fibers has been studied, and a method has been proposed in which the fineness, cutting elongation, and the like of single fibers constituting the polyamide tow are specified values (Patent Document 2). By this method, it is possible to carry out a check spinning of polyamide fibers to some extent, and a polyamide sliver having a relatively fineness and a long fiber length can be obtained.

  However, the method proposed in Patent Document 2 cannot be said to have sufficient checkability from the viewpoint of industrially stable production. For the purpose of improving checkability, a method for producing polyamide tow has been proposed in which an oil agent in which inert fine particles (silica) are newly added to a conventional oil agent is used and an oil supply treatment is performed (Patent Document 3).

  In the manufacturing method proposed in Patent Document 3, the checkability is improved, but in the long-term production of 6 hours or more, the inert fine particles dropped during the process are affected by heat and fixed. At the time of tow production, the polyamide tow comes into contact with the fixed matter and adheres to the tow surface, which may cause troubles when checking the quality of the polyamide tow, such as lowering the quality of the polyamide tow and winding the roller. For this reason, there is a problem that the removal work of the fixed matter is required periodically (once every 6 hours), and the production efficiency is not good.

  In recent years, due to increasing interest in resource reuse and global environmental protection, efforts to reduce the amount of industrial waste have been actively conducted in various fields. In order to promote the transition to a resource recycling society, polymers used for checkout spinning tow, so-called virgin polymers obtained by polymerizing fresh monomers, use petroleum-derived raw materials. Therefore, an approach of reusing thermoplastic polymer waste as a recycling raw material has been studied.

  Nylon 6 is known as a polyamide that can be chemically recycled by depolymerizing to caprolactam, which is a monomer, and repolymerizing caprolactam obtained by depolymerization to form chips. Also known is material recycling in which polyamide debris is melted into chips without depolymerization. Since the polyamide chip obtained by material recycling melts the fiber waste and polymer waste of the polyamide generated in the fiber manufacturing process into a chip, the recycling process is simple, and the cost is superior to the virgin polymer.

  However, when a polyamide chip obtained by material recycling is used, yarn breakage during spinning tends to occur. Moreover, the obtained fiber has a tendency that physical properties such as strength and elongation tend to be inferior, and there are many problems such as being unbearable in practical use (Patent Document 4).

JP-A-53-98418 JP-A-2-41422 JP-A-5-302218 JP 2009-209464 A

  In view of the background of the above-described prior art, the present invention is material-friendly by recycling fiber waste and polymer waste generated in the manufacturing process of polyamide fiber, etc., and reusing it as a raw material. A polyamide tow for check spinning having equivalent fiber properties and checkability is provided.

  Furthermore, an object of the present invention is to provide a method for producing a recycled polyamide tow that eliminates the above-described drawbacks and can perform check spinning with high quality and good operation.

  The present invention employs the following means in order to solve the above problems.

  That is, the polyamide tow for check spinning according to the present invention is a polyamide tow for check spinning using a material-recycled polyamide polymer as a raw material, and has a single fiber cutting elongation of 55% or less and a surfactant attached to the fiber surface. It is characterized by being.

In addition, the method for producing a checkout spinning polyamide tow according to the present invention is a method for producing a checkout spinning polyamide tow having a single fiber cutting elongation of 55% or less by melt-spinning, cooling and solidification, followed by oil supply treatment and drawing. A method for producing a polyamide tow for check spinning, wherein the oil supply treatment is surface-treated with a surfactant in which the following components [A] and [B] are blended in specific ratios.
[A] Anionic surfactant: 70 to 90% by weight
[B] Nonionic surfactant: 10 to 30% by weight

  Material recycling of fiber waste and polymer waste generated in the manufacturing process of polyamide fiber, etc., and recycling as raw material is environmentally friendly, low cost, and has fiber properties and checkability equivalent to conventional products. A polyamide tow for spinning can be obtained. In addition, it is possible to provide a method for producing recycled polyamide tow that can perform check spinning with high quality and good operation.

  Hereinafter, the present invention will be described in detail.

  The tow in the present invention is made of a polyamide fiber using a material recycled polyamide as a raw material. Various polyamide fibers can be used as the polyamide-based fiber, but a fiber substantially made of nylon 6 or nylon 66 is most preferable from the viewpoint of cost, mechanical properties, thermal properties, and the like.

  In the present invention, the material recycled polyamide refers to a polyamide obtained by melting polyamide fiber waste and / or polymer waste without depolymerization. Polyamide fiber waste and polymer waste include polyamide oligomers.

  In the present invention, the material recycled polyamide is preferably used at 100% by weight, but the material recycled polyamide chip may contain virgin polyamide in the material polyamide. That is, in melt spinning, in addition to the material recycled polyamide chip, a virgin polyamide chip may be added.

  However, the virgin polyamide contained in the raw material is 50% by weight or less, more preferably 25% by weight or less, from the viewpoints of reuse of earth resources and protection of the global environment.

  In the present invention, the spinning process includes all processes related to fiber production, such as a process of spinning a polymer, a process of stretching, and a process of storing.

  In the present invention, the polyamide tow is produced by melt-spinning a material recycled polyamide chip obtained by melting again the fiber waste or polymer waste of the polyamide generated in the spinning process to form a chip. Of course, polyamide fiber waste and polymer waste generated in the yarn making process may be mixed and melted again to form chips.

  In the present invention, it is important that the material recycled polyamide raw material is fiber waste or polymer waste generated in the yarn making process, that is, fiber manufacturing process, that is, so-called process waste in that it is a fiber-forming polyamide. For example, polymer scrap generated when the pipe is swept before attaching the base, fiber waste until the spinning is stabilized and collected as a product after the base is attached, or winding troubles in the spinning or drawing process. The generated fiber waste can be preferably used.

  These process wastes are preferably pulverized and finely divided before melting to form chips. It is preferable to knead at the time of melting. Specifically, a biaxial vent extruder can be preferably used, but a uniaxial extruder may be used. After melting, after extruding through a die, a method of cutting to a predetermined length and forming a chip is preferably used.

  At this time, the process waste includes foreign matters, aggregates of additives such as carbides and titanium oxide, and when it is directly converted into chips, it causes deterioration of spinnability and increased filtration pressure of the spinneret pack. Therefore, after melting, it is important to filter foreign matters mixed in the polymer through the first filter. In order to minimize the influence on spinning, the filter at this time is preferably filtered using a finer mesh of 5 to 15 μm than the second filter used in the spinning outlet gold pack. Specifically, when a filter with a mesh of 25 to 65 μm is used in the spinneret pack, it is preferable to use a filter with a mesh of 40 to 80 μm when chipping. For example, when a filter having a mesh of 70 μm (325 #) is used for the spinneret pack, a filter having a mesh of 58 μm (400 #) is used for chip formation. If the mesh of the first filter is too coarse compared to the second filter, the spinning pack is likely to be clogged, and if it is too fine, the filter will be replaced when chipping, resulting in material loss and manufacturing cost deterioration. There's a problem. In addition, about the filter to be used, both a 1st filter and a 2nd filter may be any, such as a metal wire filter, a metal wire nonwoven fabric, a flat form, a waveform, and a mountain shape.

  In the present invention, as the polyamide, any polyamide generally used for fiber production can be used. For example, nylon 6, nylon 66, a copolymer of both, nylon 12, or the like is preferably used.

  In general, in the polyamide fiber, titanium oxide is often used as a matting agent. However, the material recycled polyamide in the present invention may contain titanium oxide. Normally, the particle size of titanium oxide used as a fiber matting agent is about 0.1 to 10 μm, and even the first filter is hardly filtered. Therefore, if titanium oxide is contained in the process waste, material recycled polyamide Will remain as is. In rare cases, coarse particles of titanium oxide aggregated at the time of melting may be generated, but such coarse particles are filtered by the first filter, so that the operability is hardly affected. If the amount of titanium oxide contained in the process waste is insufficient, additional titanium oxide may be added. When titanium oxide is added, it may be added before chipping, or by blending with other chips containing titanium oxide at a high concentration when melt spinning to form fibers. good. The titanium oxide content contained in the material-recycled polyamide is preferably in the range of 0.01 to 40% by weight, more preferably 0.03 to 2% by weight, considering that the yarn-making property is not deteriorated.

  Moreover, although weathering agents, such as copper iodide, antibacterial agents, such as a silver compound, and another additive may be added depending on a use, you may contain these.

  With respect to the molecular weight (degree of polymerization) of the material recycled polyamide used in the present invention, the 98% sulfuric acid relative viscosity (ηr) at 25 ° C. is 1.8 or more and 4.5 from the viewpoint of improving the spinning properties and the physical properties of the fiber. The following is preferable.

The amount of amino end groups of the material recycled polyamide used in the present invention is preferably 4 × 10 ⁻⁵ mol / g or more and 6 × 10 ⁻⁵ mol / g or less in consideration of the effect on dyeability.

  The single fiber constituting the tow of the present invention is characterized in that an oil agent composed of [A] anionic surfactant and [B] nonionic surfactant is attached to the fiber surface.

  [A] As anionic surfactants, carboxylates of higher fatty acids, sulfates of higher alcohols and higher alkyl ethers, alkylbenzene sulfonates, paraffin sulfonates, higher alcohol phosphates, higher alkyl phosphates Acid ester salts, higher alcohol ethylene oxide adduct phosphoric acid ester salts and the like are used. Of these, higher alcohol phosphate salts such as potassium salts of higher alcohol phosphates having 12 to 18 carbon atoms are preferred. The blending ratio of the component [A] in the total oil is preferably 70 to 90% by weight, more preferably 75 to 85% by weight. If it is less than 70% by weight, the antistatic property is remarkably deteriorated, which causes winding of the metal roller at the checkout. Conversely, if it exceeds 90% by weight, scum drop increases, which may cause winding of the rubber roller. There is no.

  [B] As the nonionic surfactant, polyethylene glycol type, polyalcohol type and the like are used. Among these, a polyethylene glycol type such as propylene oxide / ethylene oxide random polyether is preferable. The blending ratio of the component [B] in the total oil is preferably 10 to 30% by weight, more preferably 15 to 25% by weight. If it is less than 10% by weight, the smoothness between the fibers is impaired, so that the checkability is remarkably deteriorated. On the other hand, if it exceeds 30% by weight, the scum falls off, which causes the rubber roller to be wound. Absent.

  The amount attached to the tow (the amount of oil attached to the tow) is preferably 0.1 to 2.0% by weight. When the amount is less than 0.1% by weight, it is difficult to obtain a sufficient improvement effect of checkability. When the amount exceeds 2.0% by weight, the surfactant easily falls off at the time of checkout. Invoke troubles such as winding around the roller.

The single fiber constituting the tow of the present invention has a cutting elongation (average value) of 55% or less, preferably 25 to 50%, and more preferably 30% to 45%. When the single fiber cut elongation exceeds 55%, the checkability is remarkably deteriorated, and when it is less than 25%, the roller winding due to the single fiber breakage occurs frequently at the checkout, and the process passability is remarkably deteriorated. It is not preferable.
Moreover, the single yarn fineness and cross-sectional shape are not particularly limited. For example, it may be a soft texture such as cashmere animal hair with a relatively fineness of 2.25 dtex or less, or while blending with wool of about 2.7 dtex etc. while utilizing the texture of the other material Fine count may be achieved. The cross-sectional shape may be a round cross section, a polygonal cross section such as a triangular cross section or a square cross section, a flat cross section, or a hollow cross section.

  The total fineness of the tow of the present invention is preferably 10 to 100 ktex, more preferably 30 to 60 ktex, from the viewpoints of operability, productivity, checking device capacity, packing form, and the like.

  The average strength of the single fiber constituting the tow of the present invention is preferably 3 to 9 cN / dtex in consideration of the anti-pill property and also considering the practicality at the time of manufacturing the fabric.

Next, a method for producing the tow of the present invention from the above polyamide will be described.
The material recycled polyamide produced by the above-described method is subjected to melt spinning. This material-recycled polyamide may be provided by re-melting the solidified chip-like polyamide with a spinning machine such as an extruder or a pressure melter method, or it may be used for spinning directly after polymerization. May be.

  The molten polyamide is discharged through a spinneret into a fibrous form. At this time, the cross-sectional shape or the composite state of the fiber is not particularly limited. The fibrous material discharged from the spinneret is taken out after being cooled and solidified by an ordinary method. As the take-up method, there are a method of winding on a drum, a method of storing in a can and the like. Further, the take-up speed is not particularly limited. It may be picked up at a low speed of about 300 m / min, may be picked up at a high speed of about 2500 m / min or more, or even 5000 m / min or more.

  If the take-up speed is sufficiently high and a high orientation is obtained, it can be subjected to check spinning without substantially stretching, but in the case of other unstretched or intermediate orientation, it is stretched after that. To be used for check spinning.

  The tow that has been taken is usually drawn after a plurality of the tow is drawn so that the total fineness after drawing becomes 10 to 100 ktex. As the stretching method, a method of stretching the tow between rollers having different peripheral speeds is usually employed. In the stretching, a method of improving the stretchability by heating with steam or hot water may be used.

  In order to obtain a low tow such that the cut elongation of a single fiber is 55% or less, for example, a method of performing heat treatment while limiting shrinkage on a hot plate or a thermal drum after stretching may be employed. The heat treatment temperature is preferably 100 to 200 ° C., and during that time, some stretching or relaxation may be performed.

  Thereafter, the tow is usually crimped by an indentation-type crimping device to improve spinnability, and further dried at a temperature of 100 ° C. or lower as necessary.

  The surfactant adhering to the fiber surface of the tow of the present invention may be applied individually or simultaneously at any stage of the above production process, and in particular, both components may be simultaneously used when refueling the tow. It is preferable to apply | coat with the containing oil agent liquid.

  The oil solution containing the surfactant may be applied to the tow by dipping or spraying (spraying or showering). The applying step may be any of before or after tow stretching, after heat treatment under constant length, after crimping, or after drying, and is performed at one or more of these steps. do it. In particular, it is preferable to apply by dipping before tow stretching.

  The oil solution for the oil supply treatment is preferably a water emulsion solution, and the concentration thereof may be about 0.5 to 10% by weight and the surfactant content may be about 0.5 to 10% by weight.

  The polyamide tow for check spinning according to the present invention may be checked by a toe check device to form a sliver, and then a fabric product according to the application in the form of a woven fabric or a knitted fabric in the state of ultra fine spun yarn or the like.

  In the process until fabrication, this synthetic fiber is mixed with other synthetic fibers, such as ordinary polyamide fibers, polyester fibers, acrylic fibers, natural fibers such as cotton and wool (for example, mixed spinning, knit, It may be used after mixing). These fabrics can be preferably used for apparel applications such as outer and inner.

  Next, the present invention will be described more specifically with reference to examples.

The following characteristic values were measured by the following method.
(1) 98% sulfuric acid relative viscosity (ηr) at 25 ° C. of polyamide: 0.01 g / mL 98% sulfuric acid solution / 25 ° C. relative viscosity was measured using an Ostwald viscometer.
(2) Amino terminal group amount of polyamide: 1 g of material was dissolved in 50 mL of a phenol / ethanol = 8/2 mixed solution, neutralized with an N / 50 hydrochloric acid aqueous solution using thymol blue as an indicator, and the amino group concentration was determined from the amount of hydrochloric acid consumed. Asked.
(3) Tow total fineness, single fiber fineness: According to the method of JIS L 1015-7-5-1A (2010 edition).
(4) Strength and elongation of single fiber: Conforms to the method of JIS L 1015-7-7-1.
(5) Number of crimps of single fiber, crimp rate: Conforms to the method of JIS L 1015-7-12-1,2.
(6) Amount of oil adhering tow: The extract (wt%) is determined according to the method of JIS L 1015-7-22 (2). Next, this extract is decomposed and the amount of polyamide polymer monomer and oligomer (hereinafter referred to as MO amount, wt%) is determined by the Kjeldahl nitrogen determination method. And the amount of tow adhesion oil is calculated by the following formula.
Amount of oil attached to tow (% by weight) = extracted amount−MO amount However, for the decomposition of the extracted portion, a mixture of sodium sulfate: potassium sulfate: copper sulfate = 1: 2: 1 (weight ratio) was used as a decomposition agent, Add sulfuric acid to decompose by heating.
(7) Oil agent active ingredient concentration: About 10 g of oil agent was placed in a conical beaker and sufficiently evaporated to dryness in a dryer at 90 to 98 ° C. The oil weight (W2) before the evaporation to dryness and the oil weight (W3) after the evaporation to dryness are measured and calculated by the following equations.
Oil agent active ingredient concentration (% by weight) = (W3 / W2) × 100
(8) Yarn break occurrence frequency: Number of yarn breaks during 1 ton production (9) Presence / absence of fixed matter: Evaluation was made on the occurrence of sticky matter during production for 8 hours.

○: There is no fixed object ×: There is a fixed object (10) Checkability: Checkability from the state of occurrence of collective breakage at the checkout, the occurrence of tow wrapping around the roller, and the frequency of equipment stoppage at the time of checkout Were evaluated relative to each other.

○: Good ×: Bad (11) Average fiber length of sliver: Conforms to the method of JIS L 1015A (staple diagram method, 2010 edition).
(12) Sliver quality: Relative evaluation was made based on variations in fiber length, the degree of sliver spots, and the like.

○: Good ×: Bad In each example and comparative example, the anionic surfactant used was lauryl alcohol phosphate potassium salt, alkyl (C12 to C14) alcohol phosphate phosphate potassium salt, The lauryl imidazoline Na salt, the nonionic surfactant is ethylene oxide / propylene oxide random polyether, the ethylene oxide / propylene oxide random polyalkyl ether, and the inert fine particles are silica having an average particle diameter of 15 μm.
[Example 1]
Polymer waste generated at the start of spinning using nylon 6, fiber waste before product collection, and wrapping yarn in the spinning and drawing process are collected, pulverized as a raw material, and finely divided. It is melted and kneaded with a shaft extruder, filtered through a metal wire flat filter with a mesh size of 58 μm, discharged from the base and cut to form a material recycled nylon 6 chip (hereinafter recycled nylon 6 chip). ) The recycled nylon 6 chip had a 98% sulfuric acid relative viscosity (ηr) at 25 ° C. of 2.7, an amino terminal group content of 4.7 × 10 ⁻⁵ mol / g, and a titanium dioxide content of 0.30% by weight. It was.

  A plurality of unstretched sub-tows were melted and discharged from a spinneret heated to 265 ° C. into a fiber and taken up at a rate of 1300 m / min. A drawn tow was used.

The unstretched tow was passed through an oil bath and sandwiched between rubber nip rollers to control the amount of adhesion, and then stretched 3.0 times in water vapor. The oil solution was a water emulsion having the following concentration and composition.
Oil active ingredient concentration: 2.0% by weight
Oil agent active ingredient composition:
Lauryl alcohol phosphate potassium salt 80 parts by weight Ethylene oxide / propylene oxide random polyether 20 parts by weight Thereafter, heat treatment is carried out on a heat drum at 170 ° C. to give the same surfactant component as in the oil agent, and then the indentation type Crimp was imparted by a crimp imparting device. Table 1 shows the physical properties of the tow obtained.

  The operability and tow properties during tow production were also good. Further, during the production of tow, no generation of sticking material was confirmed, and no cleaning work was required.

  Next, this tow was spun using Om Seisakusho's “Tow Reactor” TR-II type under the conditions of a total toe stretch ratio of 1.1 times and a main cut zone draw ratio of 2.6 times. I did it. The check spinning apparatus is a multi-stage drawing type in which the tow is drawn and checked in a six-stage multi-stage drawing type. The tow drawing zone (tow drawing part) has three stages, and then the main cut zone. Were arranged in one stage, and then, in two stages, the zones for correcting and cutting 95% or more of the constituent tows to a fiber length of 20 cm or less were sequentially arranged.

The checkability was good, no collective breakage occurred, and there was no trouble such as generation of static electricity or wrapping of a tow around a rubber roller. The obtained sliver had good quality.
[Example 2]
A tow was produced under the same conditions as in Example 1 by using a water emulsion having the following concentration and composition in the oil solution to be adhered to the undrawn yarn.
Oil active ingredient concentration: 2.0% by weight
Oil agent active ingredient composition:
Lauryl alcohol phosphate potassium salt 70 parts by weight Ethylene oxide / propylene oxide random polyether 30 parts by weight The operability and tow physical properties during tow production were also good. Further, during the production of tow, no generation of sticking material was confirmed, and no cleaning work was required. The checkability was good, no collective breakage occurred, and there was no trouble such as generation of static electricity or tow wrapping around a rubber roller. The obtained sliver had good quality.
[Example 3]
A tow was produced under the same conditions as in Example 1 by using a water emulsion having the following concentration and composition in the oil solution to be adhered to the undrawn yarn.
Oil active ingredient concentration: 2.0% by weight
Oil agent active ingredient composition:
Lauryl alcohol phosphate potassium salt 90 parts by weight Ethylene oxide / propylene oxide random polyether 10 parts by weight The operability during tow production and tow properties were also good. Further, during the production of tow, no generation of sticking material was confirmed, and no cleaning work was required. The checkability was good, no collective breakage occurred, and there was no trouble such as generation of static electricity or tow wrapping around a rubber roller. The obtained sliver had good quality.
[Example 4]
A tow was produced under the same conditions as in Example 1 by using a water emulsion having the following concentration and composition in the oil solution to be adhered to the undrawn yarn.
Oil active ingredient concentration: 2.0% by weight
Oil agent active ingredient composition:
Alkyl (C12-C14) alcohol phosphate potassium salt 80 parts by weight Ethylene oxide / propylene oxide random polyalkyl ether 20 parts by weight The operability and tow properties during tow production were also good. Further, during the production of tow, no generation of sticking material was confirmed, and no cleaning work was required. The checkability was good, no collective breakage occurred, and there was no trouble such as generation of static electricity or tow wrapping around a rubber roller. The obtained sliver had good quality.
[Example 5]
Manufactured under the same conditions as in Example 1 except that the discharge rate was changed according to the change in draw ratio and the draw ratio was 3.1 times, and a nylon 6 tow with a single fiber cut elongation of less than 45% was produced. did.
The operability and tow properties during tow production were also good. Further, during the production of tow, no generation of sticking material was confirmed, and no cleaning work was required. The checkability was good, no collective breakage occurred, and there was no trouble such as generation of static electricity or tow wrapping around a rubber roller. The obtained sliver had good quality.
[Example 6]
A tow was produced under the same conditions as in Example 1 except that recycled nylon 6 chips and virgin nylon 6 chips obtained by polymerizing fresh monomers were mixed in the following ratio and used as raw materials. Similarly, a check spinning was attempted. The virgin nylon 6 chip had a 98% sulfuric acid relative viscosity (ηr) at 25 ° C. of 2.6, an amino terminal group content of 5.3 × 10 ⁻⁵ mol / g, and a titanium oxide content of 0.30% by weight.
60% by weight recycled nylon 6 chip
Virgin nylon 6 chip 40% by weight
The operability and tow properties during tow production were also good. Further, during the production of tow, no generation of sticking material was confirmed, and no cleaning work was required. The checkability was good, no collective breakage occurred, and there was no trouble such as generation of static electricity or tow wrapping around a rubber roller. The obtained sliver had good quality.
Nylon 6 sliver obtained in Examples 1 to 6 and wool were blended at a ratio of nylon 6: wool = 40: 60 to obtain a 60th spun yarn. The fabric made from the spun yarn was an animal hair product with a high-quality feeling because the wool texture was sufficiently exhibited.
[Comparative Example 1]
A tow was produced under the same conditions as in Example 1 by using a water emulsion having the following concentration and composition in the oil solution to be adhered to the undrawn yarn.
Oil active ingredient concentration: 2.0% by weight
Oil agent active ingredient composition:
Lauryl alcohol phosphate potassium salt 80 parts by weight Lauryl imidazoline Na salt 20 parts by weight Content of silica having an average particle size of 15 mμ (vs. oil solution) 0.1% by weight
At the start of tow production, operability and tow properties were also good. However, when long-term production of 6 hours or more was performed, the inert fine particles dropped during the process fixed, the fixed matter contacted the tow surface, and a part of the tow was damaged. As a result, roller wrapping occurred and stable production was difficult, so tow production was stopped.

On the other hand, although the checkability of the tow was good, no collective breakage occurred, and there was no trouble such as generation of static electricity or wrapping of the tow around a rubber roller. The obtained sliver had good quality.
[Comparative Example 2]
A tow was produced under the same conditions as in Example 1 by using a water emulsion having the following concentration and composition in the oil solution to be adhered to the undrawn yarn.
Oil active ingredient concentration: 2.0% by weight
Oil agent active ingredient composition:
Lauryl alcohol phosphate potassium salt 80 parts by weight Lauryl imidazoline Na salt 20 parts by weight At the start of tow production, operability and tow properties were also good. Further, during the production of tow, no generation of sticking material was confirmed, and no cleaning work was required. However, sliver could not be obtained due to frequent winding of the bottom roller during checkout.
[Comparative Example 3]
A tow was produced under the same conditions as in Example 1 by using a water emulsion having the following concentration and composition in the oil solution to be adhered to the undrawn yarn.
Oil active ingredient concentration: 2.0% by weight
Oil agent active ingredient composition:
Lauryl alcohol phosphate potassium salt 65 parts by weight Ethylene oxide / propylene oxide random polyether 35 parts by weight At the start of tow production, operability and tow properties were also good. Further, during the production of tow, no generation of sticking material was confirmed, and no cleaning work was required. However, sliver could not be obtained due to frequent winding of metal rollers due to static electricity at the checkout.
[Comparative Example 4]
A tow was produced under the same conditions as in Example 1 by using a water emulsion having the following concentration and composition in the oil solution to be adhered to the undrawn yarn.
Oil active ingredient concentration: 2.0% by weight
Oil agent active ingredient composition:
Lauryl alcohol phosphate potassium salt 95 parts by weight Ethylene oxide / propylene oxide random polyether 5 parts by weight At the start of tow production, operability and tow properties were also good. Further, during the production of tow, no generation of sticking material was confirmed, and no cleaning work was required. However, sliver could not be obtained because rubber roller wrapping occurred frequently due to increased scum drop during checkout.
[Comparative Example 5]
A single fiber cut elongation was produced under the same conditions as in Example 1 except that the discharge amount was changed in accordance with the change in the draw ratio, the draw ratio was set to 2.9, and the treatment with the thermal drum was not performed. Nylon 6 tow with a content exceeding 55% was produced.

  The operability at the time of tow production was good, but the tow properties were as shown in Table 1, and the single fiber cut elongation was 68%, which was high compared with Example 1. In addition, no cleaning work was required since no sticking material was observed during tow production.

  A check spinning was attempted in the same manner as in Example 1. We changed the draw ratio at checkout from 2.7 to 4.0 times and searched for an appropriate ratio according to the elongation of the tow-constituting single fiber. The trouble could not be solved. As a result, the sliver could not be obtained because the single fiber cut elongation exceeded 55%.

Claims (2)

A polyamide tow for check spinning obtained using a material recycled polyamide as a raw material, wherein the single fiber cut elongation is 55% or less, and a surfactant is attached to the fiber surface. Polyamide tow. In a method for producing a polyamide tow for check spinning with a single fiber cutting elongation of 55% or less by subjecting a material-recycled polyamide as a raw material to melt spinning, cooling solidification, and then oiling treatment and drawing, the oil feeding treatment is as follows: A method for producing a polyamide tow for check spinning, which is surface-treated with a surfactant in which the components [A] and [B] are blended at a specific ratio.
[A] Anionic surfactant: 70 to 90% by weight
[B] Nonionic surfactant: 10 to 30% by weight