CN108138377A - Sheath-core type conjugate fiber, false twist yarn and fiber body structure - Google Patents

Abstract

The present invention provides a kind of sheath-core type conjugate fiber, and the core component and sheath ingredient of the fiber are crystalline polymer, and core component is hygroscopic polymer；At least part of core component is exposed on surface on the cross section of the sheath-core type conjugate fiber, and the long R of cross-sectional circumference is with exposing the length summation r in the core component of surface portion_SRatio r_S/ R is 0.05~0.40；The extrapolation melt initiation temperature degree of the sheath-core type conjugate fiber is at 150 DEG C or more, and the hydroscopicity difference △ MR after hot water treatment are 2.0~10.0%.The fiber extends and false twisting engineering can inhibit to melt, fracture of wire and filoplume occur few, engineering passability is good, and it forms braided fabric specking and filoplume when fiber body structures and occurs less, while excellent quality, it can inhibit the rupture of sheath part of the dyeing when hot water treatments during the hygroscopic polymer volume expansion of core component, and the dissolution of hygroscopic polymer can be inhibited, also there is excellent moisture pick-up properties after hot water treatment.

Description

Sheath-core type conjugate fiber, false twist yarn and fiber body structure Technical field

It is crystalline polymer the present invention relates to a kind of core component and sheath ingredient, and core component is hygroscopic polymer, at least a part of core component exposes the sheath-core type conjugate fiber on surface on fiber cross section.Specifically, be related to it is a kind of in order to inhibit extend and false twisting engineering occur melt, the specking and filoplume that the generation of fracture of wire and filoplume is less, engineering passability is good, forms fabric and generates when compiling the fiber body structures such as object be few, excellent quality while, hygroscopicity is still excellent after being able to suppress when the hot water treatments such as dyeing the rupture of core component hygroscopic polymer volume expansion bring sheath ingredient and the dissolution of hygroscopic polymer, hot water treatment, sheath-core type conjugate fiber suitable for dress material purposes.

Background technique

Since polyester fiber price is low, mechanical property is excellent, purposes is extremely wide.But due to lacking hygroscopicity, it is easy to produce feeling of oppression and heat in summer high humility, when winter low humidity is easy to produce electrostatic, and for the viewpoint of snugness of fit, there are problems to be solved.

In order to improve disadvantages mentioned above, in terms of assigning the hygroscopic method of polyester fiber, there are various motions so far.The hygroscopic conventional method of polyester fiber is assigned, such as combined polymerization hydrophilic compounds or addition hydrophilic compounds in the polyester, wherein hydrophilic compounds can be polyethylene glycol as an example.

For example, for polyester, proposing the motion for using the polyester of combined polymerization polyethylene glycol as hygroscopic polymer production fiber in patent document 1.Hygroscopic polymer individually carries out fibrosis in the motion, and polyester fiber is made to have hygroscopicity.

In patent document 2, the motion for the core shift sheath-core type conjugate fiber that sheath ingredient is hygroscopic polymer, core component is hydrophobic polymer is proposed.In the motion, since core component is hydrophobic polymer, morphological stability when reversible change of the fiber for moisture absorption and drying is imparted.

In patent document 3, the polyester of the core component polyethylene glycol that has been combined polymerization is proposed, the sheath-core type conjugate fiber that sheath ingredient is polyethylene terephthalate.In the motion, since core component is hygroscopic polymer, so that polyester fiber has hygroscopicity.

In patent document 4,5, polymer, the sheath ingredient for proposing the core component polyethylene glycol that has been combined polymerization are polyethylene terephthalate, and the sheath-core type conjugate fiber of a part opening of sheath.Although core component has hygroscopicity, in these motions, due to the dissolution of core component, the doughnut that shape is C-shaped assigns polyester fiber light weight.As the concrete example of the core component easily dissolved out, the polyethylene terephthalate of 500~8000g/mol of weight average molecular weight, i.e. number-average molecular weight 8000g/mol polyethylene glycol below of 8~70wt% of combined polymerization is disclosed in patent document 4；The polyethylene terephthalate for the polyethylene glycol that the molecular weight that combined polymerization 17wt% is disclosed in patent document 5 is 3000g/mol.

But, in the method that above patent document 1 is recorded, all expose fiber surface absorbent polymer due to spinning oil presence and expand, it is compiled, in weaving process in spinning, extension, false twisting engineering and system, because occurring to cause to fall off due to friction with roller or filar guide, be deposited on roller and filar guide, its consequence is exactly to be easy to produce fracture of wire and filoplume, and engineering passability and quality are problematic in that.And when the hot water treatments such as dyeing, the combined polymerization ingredient polyethylene glycol dissolution of absorbent polymer, hygroscopicity is low after there is hot water treatment.

Method described in Patent Document 2, since core component is hydrophobic polymer, although the reversible change for moisture absorption and drying has morphological stability, but since at least more than half fiber surface has absorbent polymer exposing, as 1 the method for patent document, the expansion of absorbent polymer can occur and fall off, engineering passability and quality are problematic in that.

Method described in Patent Document 3, since the hygroscopic polymer of core component is fully wrapped around by sheath ingredient, therefore hygroscopic polymer is able to suppress because of expansion caused by spinning oil, and because falling off caused by rubbing with roller and filar guide, although engineering passage capacity is improved, but the problem of volume expansion occurs for the absorbent polymer of core component when the hot water treatments such as dyeing, and sheath ingredient is destroyed, low quality, still has.Especially, it is dissolved out by the damp absorbent polyester of starting point core component of the breach of sheath ingredient, hygroscopicity is low after there is hot water treatment.

The method that patent document 4,5 is recorded, since the hygroscopic polymer only a fraction of core component is exposed in fiber surface, energy Enough inhibit hygroscopic polymer because expanding caused by spinning oil, and because falling off caused by with roller and filar guide friction, engineering passage capacity is improved.But the purpose is to dissolve out core component, due to dissolving out core component completely by hot water treatments such as dyeing, obtained C font polyester doughnut does not have hygroscopicity.

[existing technical literature]

[patent document]

[patent document 1] special open 2006-104379 bulletin

[patent document 2] Japanese Laid-Open Patent Publication 9-13257 bulletin

[patent document 3] special open 2001-172374 bulletin

[patent document 4] Japanese Laid-Open Patent Publication 6-200473 bulletin

[patent document 5] special open 2007-131980 bulletin

Summary of the invention

Problem of the present invention is that solving above-mentioned technical problem point, there is provided a kind of in order to inhibit to extend and what false twisting engineering occurred melts, the generation of fracture of wire and filoplume is less, engineering passability is good, the specking that forms fabric and generate when compiling the fiber body structures such as object and filoplume are few, excellent quality while, be able to suppress when the hot water treatments such as dyeing the rupture of core component hygroscopic polymer volume expansion bring sheath ingredient and the dissolution of hygroscopic polymer, hot water treatment after hygroscopicity is still excellent, sheath-core type conjugate fiber suitable for dress material purposes.

The project of aforementioned present invention passes through the available solution of core sheath composite fibre with following characteristics.The core component and sheath ingredient of the sheath-core type conjugate fiber are crystalline polymer, and core component is hygroscopic polymer；At least a part of core component is exposed on surface on the cross section of the sheath-core type conjugate fiber, and the long R of cross-sectional circumference and exposes the length summation r in the core component of surface portion_SRatio r_S/ R is 0.05~0.40；The extrapolation melt initiation temperature degree of the sheath-core type conjugate fiber is at 150 DEG C or more, and the hydroscopicity difference △ MR after hot water treatment is 2.0~10.0%.

Meanwhile in the cross section of fiber, the long R of cross-sectional circumference and expose surface portion core component length maximum value r_MRatio r_M/ R is 0.01~0.20, the combined weight ratio preferably 10/90~70/30 of core component and sheath ingredient.

Also, the tone variations value △ b value of composite fibre is preferably 3.0 hereinafter, preferably comprising half hindered phenol anti-oxidants for structure as shown in Equation 1 in composite fibre before and after hot water treatment.

Wherein, half hindered phenol anti-oxidants that R1 is hydrocarbon, oxygen, any combination is formed in nitrogen, half hindered phenol anti-oxidants that R2 is hydrogen, any one combines formation in hydrocarbon, oxygen, nitrogen.

The hygroscopic polymer of aforementioned core component is preferably using polyethers as at least one of the polyether ester of combined polymerization ingredient, polyetheramides, polyetheramides ester.Meanwhile the preferred polyethylene glycol of polyethers, polypropylene glycol, polytetramethylene glycol.

For aforementioned polyether ester preferably using aromatic binary carboxylic acid and aliphatic dihydroxy alcohol as main composition, polyethers is combined polymerization ingredient.When the preferred ethylene glycol of the aliphatic dihydroxy alcohol, the number-average molecular weight of polyethers preferably 4000~30000g/mol, combined polymerization rate preferably 10~35wt% of polyethers.Meanwhile when the preferred 1,4-butanediol of the aliphatic dihydroxy alcohol, the number-average molecular weight of polyethers preferably 2000~30000g/mol, combined polymerization rate preferably 10~60wt% of polyethers.

Also, the sheath ingredient preferred cationic dyeable polyester of aforementioned sheath-core type conjugate fiber.

False twist yarn of the invention is closed to twist and be formed by 2 sheath-core type conjugate fibers mentioned previously above, and at least part of fiber body structure preferentially uses aforementioned sheath-core type conjugate fiber and/or false twist yarn.

By means of the invention it is possible to inhibit extend and false twisting engineering occur melt, the generation of fracture of wire and filoplume is few, and engineering passability is good.Meanwhile the specking and filoplume for forming fabric and generating when compiling the fiber body structures such as object are few, excellent quality.Further, it is possible to inhibit when the hot water treatments such as dyeing after the rupture and the dissolution of hygroscopic polymer, hot water treatment of core component hygroscopic polymer volume expansion bring sheath ingredient that hygroscopicity is still excellent, sheath-core type conjugate fiber suitable for dress material purposes.

Detailed description of the invention

(a) of Fig. 1~(m) is the schematic diagram of the section configuration for the core sheath composite fibre of the present invention enumerated, and in figure, 1 indicates core component, and 2 indicate sheath ingredients.

Fig. 2 is the schematic diagram of the section configuration of core sheath composite fibre prepared by comparative example 1.

Specific embodiment

Sheath-core type conjugate fiber of the invention, core component and sheath ingredient are crystalline polymer, and core component is hygroscopic polymer, at least a part of core component is exposed on surface on fiber cross section, and the long R of cross-sectional circumference and exposes the length summation r in the core component of surface portion_SRatio r_S/ R is 0.05~0.40；The extrapolation melt initiation temperature degree of the sheath-core type conjugate fiber is at 150 DEG C or more, and the hydroscopicity difference △ MR after hot water treatment is 2.0~10.0%.

Under normal circumstances, hygroscopic polymer is easy to happen expansion because of the presence of spinning oil, friction, which occurs, with roller or filar guide leads to the dirt for falling off and being formed accumulation, cause fracture of wire and filoplume, thus engineering passability is bad, and since specking and filoplume can occur when forming the fiber body structures such as fabric and volume object, there is a problem of that quality is low.Meanwhile because, with the contact of heated roller and heater, there is also interfibrous the problem of melting in extension and false twisting engineering.For betterment works passability and fiber quality, propose the motion for the sheath-core type conjugate fiber that core component hygroscopic polymer is wrapped up completely, but the product of core component expands when the hot water treatments such as dyeing, hygroscopic polymer is from the sheath component portion dissolution being destroyed, and hygroscopicity disappears after there is hot water treatment.Therefore, last point of core component exposing of fiber cross section is proposed in the motion of the sheath-core type conjugate fiber on surface, but the rupture of sheath part and dissolution these problems of core component when melting when false twisting, hot water treatment cannot be inhibited simultaneously, as a result, it is good and have after high-quality and hot water treatment still with hygroscopic fiber that engineering passability still cannot be obtained.

In view of the above problems, what the present inventor carried out examine with keen determination as a result, meet core component and sheath ingredient at the same have crystallinity and core component have hygroscopicity, the long R of the cross-sectional circumference of fiber and exposing the core component of surface portion length summation r_SRatio r_S/ R is 0.05~0.40, the extrapolation melt initiation temperature degree of sheath-core type conjugate fiber after 150 DEG C or more, and the above problem is able to whole solutions, successfully obtain engineering passability is good and quality is high, after hot water treatment still with hygroscopic sheath-core type conjugate fiber.

The core component of sheath-core type conjugate fiber of the invention is crystalline polymer.If core component has crystallinity, when being spent by the method recorded in embodiment measurement extrapolation melt initiation temperature, it can observe along with melting for crystallization and melt peak.If core component has crystallinity, because that can be suppressed in extension and false twisting engineering with interfibrous melt caused by the contact of heated roller and heater, deposit on heated roller, heater and filar guide tails off, and fracture of wire and filoplume tail off, and engineering passability is good.Meanwhile the generation of specking and filoplume tails off when forming fabric and compiling the fiber body structures such as object, excellent quality.Also, with crystalline occasion, the dissolution of the hygroscopic polymer of core component can be suppressed when the hot water treatments such as dyeing, and hygroscopicity can be kept after hot water treatment.

The core component of sheath-core type conjugate fiber of the invention is hygroscopic polymer.In the present invention, the hygroscopic polymer is the polymer of poor (the △ MR) 2.0% or more of hydroscopicity.Hydroscopicity of the present invention poor (△ MR) refers to the value that method documented by embodiment is measured.Core component is compound by carrying out with sheath ingredient if having hygroscopicity, can obtain the excellent sheath-core type conjugate fiber of hygroscopicity.

The core component of sheath-core type conjugate fiber of the invention, what can specifically be enumerated has polyether ester, polyetheramides, polyetheramides ester, polyamide, thermoplasticity cellulose derivative, polyvinylpyrrolidone etc. to have hygroscopic polymer, but is not limited to the above polymer.In particular, it is preferred that using polyethers as the polyether ester of combined polymerization ingredient, polyetheramides, polyetheramides ester, especially because polyether ester excellent heat resistance, the mechanical property of obtained sheath-core type conjugate fiber and tone are all relatively good thus more preferable.Above-mentioned hygroscopic polymer can be used alone, and two or more can also be used in combination.Meanwhile these hygroscopic polymers and polyester, polyamide, polyolefin be kneaded after substance can also be used as hygroscopic polymer use.

The combined polymerization ingredient polyethers of aforementioned hygroscopic polymer, what can specifically be enumerated has polyethylene glycol, polypropylene glycol, polytetramethylene glycol etc. that body is polymerized alone, polyethylene glycol propylene glycol copolymer, copolymers such as polyethylene glycol butanediol etc., but it is not limited to the above substance.In particular, due to polyethylene glycol, polypropylene glycol, polytetramethylene glycol manufacture and when using, access is good and preferred, and especially polyethylene glycol hygroscopicity is excellent and more preferable.

Aforementioned polyether ester, from the viewpoint of heat resistance and mechanical property, using aromatic binary carboxylic acid and aliphatic dihydroxy alcohol as predominant repeat unit, preferably using polyethers as combined polymerization ingredient.Aromatic binary carboxylic acid, what can specifically be enumerated has terephthalic acid (TPA), M-phthalic acid, phthalic acid, 5-sodium sulfo isophthalate, M-phthalic acid -5- Sulfonic Lithium, 5- (tetraalkyl)-M-phthalic acid sulphur Acid phosphorous compound, 4,4 '-biphenyl dicarboxylic acids, 2,6- how dioctyl phthalate etc., but be not limited to the above substance.Meanwhile aliphatic dihydroxy alcohol can specifically enumerate have ethylene glycol, 1,3-PD, 1,4-butanediol, hexylene glycol, hexamethylene hexylene glycol, diethylene glycol, hexa-methylene ethylene glycol, neopentyl glycol etc., but be not limited to the above substance.In particular, access is good thus preferred when the manufacture of ethylene glycol, propylene glycol, 1,4-butanediol and use.From the perspective of heat resistance and mechanical property, more preferable ethylene glycol；From the perspective of crystallinity, more preferable 1,4-butanediol.

The number-average molecular weight and combined polymerization rate of the combined polymerization ingredient polyethers of aforementioned polyether ester can suitably be selected in the range of polyether ester has crystallinity, and preferred range is different and different according to the constituent of polyether ester.For example, polyether ester constituent aliphatic dihydroxy alcohol be ethylene glycol occasion under, if the combined polymerization rate of polyethers is excessively high, dyeing etc. hot water treatments when polyether ester will be dissolved in the hot water, hygroscopicity is low after hot water treatment.Meanwhile when the constituent aliphatic dihydroxy alcohol of polyether ester is 1,4-butanediol, compared with the above-mentioned occasion using ethylene glycol, since the crystallinity of polymer is high, even in the higher situation of combined polymerization rate of polyether compound, the dissolution of polyether ester in hot water can also be inhibited.That is, since the combined polymerization rate of polyethers can be improved, the hygroscopicity of polyether ester, the hygroscopicity of the sheath-core type conjugate fiber even obtained can be also improved when aliphatic dihydroxy alcohol uses 1,4-butanediol.

The constituent aliphatic dihydroxy alcohol of polyether ester is the occasion of ethylene glycol, the number-average molecular weight of polyethers preferably 4000~30000g/mol, combined polymerization rate preferably 10~35wt% of polyethers.For the number-average molecular weight of polyethers if 4000g/mol or more, the hygroscopicity of polyether ester is high, and hygroscopicity excellent sheath-core type conjugate fiber can be obtained when using as core component.Simultaneously, it is able to suppress the reduction of the crystalline decline of polyether ester and melt initiation temperature degree of extrapolating, due to extend and false twisting engineering in because can be also suppressed with interfibrous melt caused by the contact of heated roller and heater, heated roller, heater, the deposit on filar guide, fracture of wire and filoplume tail off, engineering passability is good, the generation of specking and filoplume tails off when forming fabric and compiling the fiber body structures such as object, excellent quality.On the other hand, the number-average molecular weight of polyethers is if 30000g/mol or less, and polycondensation reaction is high, and unreacted polyethers is reduced, dissolution when being able to suppress the hot water treatments such as dyeing in the hot water, and the hygroscopicity after hot water treatment can be maintained.The preferred 25000g/mol of the number-average molecular weight of polyethers is hereinafter, more preferably 20000g/mol or less.Meanwhile the combined polymerization rate of polyethers, if 10wt% or more, the hygroscopicity of polyether ester is high, and hygroscopicity excellent sheath-core type conjugate fiber can be obtained when using as core component.Combined polymerization the rate more preferable 15wt% or more, most preferably 20wt% or more of polyethers.On the other hand, the combined polymerization rate of polyethers is if 35wt% or less, due to extend and false twisting engineering in because that can be suppressed with interfibrous melt caused by the contact of heated roller and heater, heated roller, heater, the deposit on guide rail, fracture of wire and filoplume tail off, engineering passability is good, the generation of specking and filoplume tails off when forming fabric and compiling the fiber body structures such as object, excellent quality.Meanwhile, it is capable to inhibit the dissolution of core component polyether ester in hot water when the hot water treatments such as dyeing, hygroscopicity is able to maintain that after hot water treatment.The more preferable 32wt% of combined polymerization rate of polyethers is hereinafter, most preferably 30wt% or less.

The constituent aliphatic dihydroxy alcohol of polyether ester is the occasion of 1,4-butanediol, the number-average molecular weight of polyethers preferably 2000~30000g/mol, combined polymerization rate preferably 10~60wt% of polyethers.For the number-average molecular weight of polyethers if 2000g/mol or more, the hygroscopicity of polyether ester is high, and hygroscopicity excellent sheath-core type conjugate fiber can be obtained when using as core component.Meanwhile, it is capable to which the crystallinity of polyether ester is inhibited to decline.The number-average molecular weight of polyethers more preferable 3000g/mol or more, most preferably 5000g/mol or more.Simultaneously, the number-average molecular weight of polyethers is if 8000g/mol or more, it is able to suppress the reduction of the crystalline decline of polyether ester and melt initiation temperature degree of extrapolating, due to extend and false twisting engineering in because can be also suppressed with interfibrous melt caused by the contact of heated roller and heater, heated roller, heater, the deposit on guide rail, fracture of wire and filoplume tail off, engineering passability is good, the generation of specking and filoplume tails off when forming fabric and compiling the fiber body structures such as object, excellent quality, thus become particularly preferred.On the other hand, the number-average molecular weight of polyethers is if 30000g/mol or less, and polycondensation reaction is high, and unreacted polyethers is reduced, dissolution when being able to suppress the hot water treatments such as dyeing in the hot water, and the hygroscopicity after hot water treatment is able to maintain that.The more preferable 27000g/mol of the number-average molecular weight of polyethers hereinafter, most preferably 25000g/mol hereinafter, particularly preferably 20000g/mol or less.Meanwhile the combined polymerization rate of polyethers is if 10wt% or more, the hygroscopicity of polyether ester is high, as core component use when can obtain the excellent sheath-core type conjugate fiber of hygroscopicity.Combined polymerization the rate more preferable 15wt% or more, most preferably 20wt% or more of polyethers.On the other hand, the combined polymerization rate of polyethers is in 60wt% or less, due to extend and false twisting engineering in because that can be suppressed with interfibrous melt caused by the contact of heated roller and heater, heated roller, heater, the deposit on guide rail, fracture of wire and filoplume tail off, engineering passability is good, the generation of specking and filoplume tails off when forming fabric and compiling the fiber body structures such as object, excellent quality.Meanwhile, it is capable to inhibit dissolution in the hot water when the hot water treatments such as dyeing, the hygroscopicity after hot water treatment is able to maintain that.The more preferable 55wt% of combined polymerization rate of polyethers is hereinafter, most preferably 50wt% Hereinafter, particularly preferably 45wt% or less.

Under normal circumstances, as the obtained fiber of polyether ester made of a large amount of polyethers combined polymerizations is added in polyester, fiber hydroscopicity sharp fall can be led to because of the oxygenolysis of polyether group.So, in the polymerization process of polyether ester, Hinered phenols antioxidant can be in most cases added, most of hindered phenol anti-oxidants are with four [β-(3,5- di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol esters (IR1010 of BASF).But the contraposition of the ether free radical meeting stalled offence phenolic antioxidant phenolic hydroxyl group of oxygenolysis formation, form the quinones substance of the xanthochromia origin cause of formation.In addition same reason, due to NO₂Reaction can also generate yellow substance, i.e. NOx (nitrogen oxygen) fastness is low, impacts to the quality of fiber.For the combined polymerization rate of polyethers in 25wt% or less, since the additive amount of hindered phenol anti-oxidants is few, Yellowing is fewer, but the combined polymerization rate of polyethers, in 25wt% or more, Yellowing significantly occurs.However, even oxygenolysis forms ether free radical, in the case where half hindered phenol anti-oxidants using structure shown in formula 1, due to being methyl on the side ortho position of phenolic hydroxyl group, steric hindrance is small, thus the ortho position of the phenolic hydroxyl group of half hindered phenol anti-oxidants will not generate quinones substance, xanthochromia is inhibited by attack.

Wherein, half hindered phenol anti-oxidants that R1 is hydrocarbon, oxygen, any combination is formed in nitrogen, half hindered phenol anti-oxidants that R2 is hydrogen, any one combines formation in hydrocarbon, oxygen, nitrogen.

As half hindered phenol anti-oxidants, it is preferred that 3 of the structure as shown in following formula 2,9- bis- [1,1- dimethyl -2- [(3- tertiary butyl-4-hydroxy -5- aminomethyl phenyl) propionyloxy] ethyl] -2,4,1,3 of structure shown in 8,10- tetra- oxaspiro [5.5] hendecanes (AO-80 of ADEKA society) and following formula 3, (4- tert-butyl -3- the hydroxyl -2 of 5- tri-, 6- dimethyl benzyl) -1,3,5-triazines -2,4, at least one of 6- (1H, 3H, 5H)-triketone (CN1790 of CYTEC society).

The additive amount of antioxidant can make selection appropriate, preferably 0.5~8.0wt% according to the combined polymerization rate of polyethers.In 0.5wt% or more, the oxygenolysis of polyether ester is suppressed the additive amount of antioxidant, and the hygroscopicity of fiber lowly can be also suppressed, thus becomes preferred.The additive amount of antioxidant is more preferably 1.0wt% or more, most preferably 1.5wt% or more.On the other hand, for the additive amount of antioxidant in 8.0wt% or less, antioxidant itself, which decomposes, causes the xanthochromia of fiber to be suppressed, thus becomes preferred.The additive amount of antioxidant is more preferably 7.0wt% hereinafter, most preferably 6.0wt% or less.

The sheath ingredient of sheath-core type conjugate fiber of the invention has crystallinity.If sheath ingredient has crystallinity, when being spent by the method recorded in embodiment measurement extrapolation melt initiation temperature, it can observe along with melting for crystallization and melt peak.If sheath ingredient has crystallinity, it is able to suppress in extension and false twisting engineering because melting with interfibrous caused by the contact of heated roller and heater, deposit on heated roller, heater and filar guide tails off, fracture of wire and filoplume tail off, engineering passability is good, the generation of specking and filoplume tails off when forming fabric and compiling the fiber body structures such as object, excellent quality.Meanwhile can inhibit dyeing etc. hot water treatments when sheath ingredient dissolution.

The sheath ingredient of sheath-core type conjugate fiber of the invention, what can specifically be enumerated has the polyester such as polyethylene terephthalate, polybutylene terephthalate (PBT), the polyamide such as nylon 6, nylon66 fiber, the polyolefin such as polyethylene, polypropylene, but is not limited to the above substance. In particular, due to polyester has excellent mechanical property and a durability and it is preferred that.Meanwhile sheath ingredient is the occasion of the hydrophobic polymers such as polyester or polyolefin, the hygroscopicity of the core component hygroscopic polymer exposed on surface can and deposit with the sense of touch of the drying of sheath component hydrophobic polymer, can obtain fiber body structure comfortable and easy to wear.

The polyester of sheath ingredient about sheath-core type conjugate fiber of the present invention, what can specifically be enumerated has the aromatic polyesters such as polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate (PBT), aliphatic polyesters such as polylactic acid, polyglycolic acid etc., but it is not limited to the above substance.In particular, polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate (PBT) have excellent mechanical property and durability, access is good and preferred when manufacture and when using.Meanwhile polyethylene terephthalate have the distinctive straightening sense of polyester fiber and it is preferred that, polybutylene terephthalate (PBT) have high crystallinity and it is preferred that.

The sheath ingredient of sheath-core type conjugate fiber of the invention, preferably cation dyeable polyester.It if polyester has the anionic sites such as sulfonic group, can interact with having the dye of positive ion at cationic position, thus there is cation dyeable.If sheath ingredient is cation dyeable polyester, while there is distinct color emissivity, can be prevented when being used in mixed way with polyurethane fiber dyestuff pollution thus it is preferred.The combined polymerization ingredient of cation dyeable polyester specifically has 5- M-phthalic acid sulfonate, and what can be enumerated has lithium salts, sodium salt, sylvite, rubidium salt, cesium salt etc., but is not limited to the above substance.The crystallinity of particularly preferred lithium salts and sodium salt, especially sodium salt is excellent thus more preferable.

Sheath-core type conjugate fiber of the invention, at least a part of core component is exposed on surface on fiber cross section.The sheath-core type conjugate fiber wrapped up completely from core component is different, since the sheath breakage after volume expansion occurs for core component hygroscopic polymer when core component at least a part of on fiber cross section, which is exposed, is able to suppress the hot water treatments such as dyeing on surface.Simultaneously as core component hygroscopic polymer, which exposes, finds that the sheath-core type conjugate fiber that it is wrapped up completely than core component has higher hygroscopicity on surface.

The length summation r of sheath-core type conjugate fiber of the invention, fiber cross section outer perimeter R and exposing in the core component of surface portion_SRatio r_S/ R is 0.05~0.40.The length summation r of the core component of fiber cross section outer perimeter R and exposing of the invention in surface portion_SRatio r_S/ R refers to the value calculated by the method that embodiment is recorded.As the r of sheath-core type conjugate fiber_SAt 0.05 or more, discovery is because core component hygroscopic polymer exposes on surface the hygroscopicity of the sheath-core type conjugate fiber wrapped up completely than core component is higher/R.Meanwhile volume expansion occurs for core component hygroscopic polymer when the hot water treatments such as dyeing, is able to suppress sheath and is destroyed.The r of sheath-core type conjugate fiber_S/ R is preferably 0.07 or more, more preferably 0.10 or more.On the other hand, the r of sheath-core type conjugate fiber_SWhen/R is below 0.40, because that can be suppressed with interfibrous melt caused by the contact of heated roller and heater in extension and false twisting engineering, heated roller, heater, the deposit on filar guide, fracture of wire and filoplume tail off, engineering passability is good, the generation of specking and filoplume tails off when forming fabric and compiling the fiber body structures such as object, excellent quality.Meanwhile, it is capable to inhibit the dissolution of core component hygroscopic polymer in the hot water when the hot water treatments such as dyeing, hygroscopicity is able to maintain after hot water treatment.The r of sheath-core type conjugate fiber_S/ R more preferable 0.35 is hereinafter, most preferably 0.30 or less.

Sheath-core type conjugate fiber of the invention, the outer perimeter R of fiber cross section and exposes the maximum value r in the core component length of surface portion_MRatio r_M/ R preferably 0.01~0.20.The maximum value r of the core component length of fiber cross section outer perimeter R and exposing of the invention in surface portion_MRatio r_M/ R refers to the value calculated by the method that embodiment is recorded.The r of sheath-core type conjugate fiber_M/ R at 0.01 or more, discovery because the exposing of core component hygroscopic polymer on surface the hygroscopicity of the sheath-core type conjugate fiber wrapped up completely than core component is higher, become preferred；Meanwhile volume expansion occurs for core component hygroscopic polymer when the hot water treatments such as dyeing, is able to suppress sheath and is destroyed, becomes preferred.The r of sheath-core type conjugate fiber_M/ R is more preferably 0.03 or more, most preferably 0.05 or more.On the other hand, the r of sheath-core type conjugate fiber_MWhen/R is below 0.20, because that can be suppressed with interfibrous melt caused by the contact of heated roller and heater in extension and false twisting engineering, heated roller, heater, the deposit on filar guide, fracture of wire and filoplume tail off, engineering passability is good, the generation of specking and filoplume tails off when forming fabric and compiling the fiber body structures such as object, excellent quality.Meanwhile, it is capable to inhibit the dissolution of core component hygroscopic polymer in the hot water when the hot water treatments such as dyeing, hygroscopicity is able to maintain after hot water treatment.The r of sheath-core type conjugate fiber_M/ R is more preferably 0.17 hereinafter, most preferably below 0.15.

Various auxiliary modifiers can also be added in sheath-core type conjugate fiber of the invention, core component and/or sheath ingredient.Auxiliary modifier, what can specifically be enumerated has phase solvent, plasticizer, acidification preventing agent, ultraviolet absorbing agent, infrared absorbent, fluorescent whitening agent, release agent, antibacterial agent, nucleating agent, heat stabilizer, acidification preventing agent, charged preventor, coloring agent, regulator, delustering agent, defoaming agent, preservative, gelating agent, latex, filler, ink, colouring matter, dyestuff, pigment, fragrance etc., but not It is limited to above-mentioned substance.Above-mentioned auxiliary additive can be used alone, and can also be used in mixed way.

The extrapolation melt initiation temperature degree of sheath-core type conjugate fiber of the invention is at 150 DEG C or more.The extrapolation melt initiation temperature degree of sheath-core type conjugate fiber of the invention refers to the value calculated by the method that embodiment is recorded.Also, observe multiple occasions for melting peak, since temperature lowest side melt peak calculate.The extrapolation melt initiation temperature degree of sheath-core type conjugate fiber is if 150 DEG C or more, because that can be suppressed with interfibrous melt caused by the contact of heated roller and heater in extension and false twisting engineering, heated roller, heater, the deposit on filar guide, fracture of wire and filoplume tail off, engineering passability is good, the generation of specking and filoplume tails off when forming fabric and compiling the fiber body structures such as object, excellent quality.More preferable 170 DEG C of extrapolation melt initiation temperature degree of sheath-core type conjugate fiber or more, most preferably 190 DEG C or more, particularly preferred 200 DEG C or more.

The core component of sheath-core type conjugate fiber of the invention/sheath ingredient is compound than (weight ratio) preferably 10/90~70/30.The core component of sheath-core type conjugate fiber of the invention/sheath ingredient is compound than (weight ratio), refers to the value calculated by the method that embodiment is recorded.The compositely proportional of the core component of sheath-core type conjugate fiber can obtain having excellent hygroscopic sheath-core type conjugate fiber in 10wt% or more.The core component of sheath-core type conjugate fiber of the invention it is compound than more preferable 20wt% or more, most preferably 30wt% or more.On the other hand, the core component of sheath-core type conjugate fiber is compound than in 70wt%, hereinafter, when the compound ratio of i.e. sheath ingredient is in 30wt% or more, sheath ingredient can obtain well-pressed, dry sense of touch.Simultaneously, when being able to suppress extension and when false twisting when the rupture, moisture absorption of sheath caused by external force sheath caused by the volume expansion of core component rupture, hygroscopicity caused by the dissolution of core component hygroscopic polymer in the hot water declines problems when the hot water treatments such as low quality caused by the generation of filoplume, dyeing.The core component of sheath-core type conjugate fiber of the invention it is compound than more preferable 60wt% hereinafter, most preferably 50wt% or less.

The fiber number of the multifilament of the composite fibre of core-sheath-type of the invention, is not limited specifically, depending on the application, characteristic requirements can make appropriate choice, preferably 10~500dtex.Fiber number of the invention refers to the value for the method measurement recorded by embodiment.For the fiber number of sheath-core type conjugate fiber in 10dtex or more, fracture of wire is fewer, and engineering passability is good, and the generation of filoplume is few when use, excellent in te pins of durability.The fiber number of sheath-core type conjugate fiber more preferable 30dtex or more, most preferably 50dtex or more.On the other hand, in 500dtex or less, the flexibility of fiber and fiber body structure is not damaged the fiber number of sheath-core type conjugate fiber.The more preferable 400dtex of the fiber number of sheath-core type conjugate fiber is hereinafter, most preferably 300dtex or less.

The filament number of sheath-core type conjugate fiber of the invention, not limited specifically, depending on the application, characteristic requirements can make appropriate choice, preferably 0.5~4.0dtex.Filament number of the invention refers to the fiber number of the measurement of the method according to documented by embodiment divided by the resulting value of number of monofilaments.For the filament number of sheath-core type conjugate fiber in 0.5dtex or more, fracture of wire is fewer, and engineering passability is good, and the generation of filoplume is few when use, excellent in te pins of durability.The filament number of sheath-core type conjugate fiber more preferable 0.6dtex or more, most preferably 0.8dtex or more.On the other hand, in 4.0dtex or less, the flexibility of fiber and fiber body structure is not damaged the filament number of sheath-core type conjugate fiber.The more preferable 2.0dtex of the filament number of sheath-core type conjugate fiber is hereinafter, most preferably 1.5dtex or less.

The intensity of sheath-core type conjugate fiber of the invention, there is no specifically being limited, depending on the application and characteristic requirements can be made appropriate choice, according to the requirement of mechanical property preferably 2.0~5.0cN/dtex.Intensity of the invention refers to the value for the method measurement recorded by embodiment.For the intensity of sheath-core type conjugate fiber in 2.0cN/dtex or more, the generation of filoplume is few when use, excellent in te pins of durability.The intensity of sheath-core type conjugate fiber more preferable 2.5cN/dtex or more, most preferably 3.0cN/dtex or more.On the other hand, in 5.0cN/dtex or less, the flexibility of fiber and fiber body structure is not damaged the intensity of sheath-core type conjugate fiber.

The elongation of sheath-core type conjugate fiber of the invention, is not limited specifically, and depending on the application and characteristic requirements can make appropriate choice, from the viewpoint preferably 10~60% of durability.Elongation of the invention refers to the value for the method measurement recorded by embodiment.For the elongation of sheath-core type conjugate fiber at 10% or more, the abrasion performance of fiber and fiber body structure is good, and the generation of filoplume is few when use, and durability is good.The elongation of sheath-core type conjugate fiber more preferable 15% or more, most preferably 20% or more.On the other hand, when the elongation of sheath-core type conjugate fiber is below 60%, the dimensional stability of fiber and fiber body structure is good.The elongation of sheath-core type conjugate fiber more preferable 55% is hereinafter, most preferably 50% or less.

Hydroscopicity poor (△ MR) after the hot water treatment of sheath-core type conjugate fiber of the invention is 2.0~10.0%.Hydroscopicity after hot water treatment of the present invention is poor (△ MR), refers to the value for the method measurement recorded by embodiment.△ MR refers to, it is assumed that the hydroscopicity after slight movement in clothes when 30 DEG C of temperature, humidity 90%RH, the difference with hydroscopicity when 20 DEG C of ambient temperature, humidity 65%RH.That is, △ MR is hygroscopic index, and the higher snugness of fit of △ MR is better.Hydroscopicity of the invention poor (△ MR) refers to the value after hot water treatment, indicates still to be very important with hygroscopicity after the hot water treatments such as dyeing.At 2.0% or more, the feeling of oppression and heat in clothes reduces △ MR after sheath-core type conjugate fiber hot water treatment, has snugness of fit.△ MR after sheath-core type conjugate fiber hot water treatment is preferably 3.0% or more, more preferably 3.5% or more, most preferably 4.0% or more.On the other hand, when the △ MR after sheath-core type conjugate fiber hot water treatment is below 10%, engineering passability and access are good, excellent in te pins of durability when use.

Sheath-core type conjugate fiber of the invention, the composite fibre tone variations value △ b after hot water treatment is preferably 3.0 or less.The changing value △ b of hot water treatment front and back of the present invention composite fibre tone is the value that the method that embodiment is recorded is measured.For the changing value △ b of composite fibre tone below 3.0, the xanthochromia of fiber is few after hot water treatment, and the fiber of better quality can be obtained before and after hot water treatment.The changing value △ b of composite fibre tone is preferably 2.0 hereinafter, more preferably 1.5 hereinafter, further preferably 1.0 or less before and after hot water treatment.

Sheath-core type conjugate fiber of the invention the outer perimeter R of fiber cross section and exposes the length summation r in the core component of surface portion when core component at least a part of on fiber cross section is exposed on surface_SRatio r_SWhen/R meets 0.05~0.40, fiber cross-sectional shapes are not limited specifically, depending on the application and characteristic requirements can be selected accordingly.Simultaneously, the number exposed in the core component of surface portion is not also limited specifically, such as, at 1 shown in Fig. 1 (a)~(c), at 2 shown in Fig. 1 (d), (e), at 3 shown in Fig. 1 (f), (g), 4 shown in Fig. 1 (h)~(j) at have the section configuration exposed in the part on surface, but be not limited to above-mentioned enumerate.From inhibiting to extend and from the point of view of the dissolution of core component hygroscopic polymer when the hot water treatments such as melting, dye of false twisting engineering and while using wear away durability, the fewer exposing the better in the core component part on surface, it is therefore preferable that exposing shown in Fig. 1 (a)~(c) is the section configuration at 1 in the part of the core component on surface.More specific, sheath ingredient shown in core shift core-sheath-type, Fig. 1 (c) shown in preferably Fig. 1 (a), (b) is the core-sheath-type section configuration of c-type.Meanwhile the inconsistent situation of each length of the exposing in the core component part on surface shown in Fig. 1 (j) can also be with.Furthermore the shape of section shown in Fig. 1 (k)~(m) is pancake, cocoon shape, trilobal are ok.

Sheath-core type conjugate fiber of the invention does not limit the form of fiber specifically, and the various forms such as monofilament, multifilament, short fibre are ok.

Sheath-core type conjugate fiber of the invention can carry out false twisting same as general fiber and processing of twisting thread, and weaving and braiding can also use method same as general fiber.

The form of sheath-core type conjugate fiber and/or the fiber body structure formed by false twist yarn of the invention, is not limited particularly, and according to well known method, woven fabric, braided fabric, looped pile cloth and silk, nonwoven fabric, spinning, filling cotton etc. are ok.Simultaneously, sheath-core type conjugate fiber of the invention and/or the fiber body structure formed by false twist yarn, it can be any braided fabric tissue, plain weave, twill weave, Zhu Zi are knitted or these variation is knitted, and warp knit, weft knitting, circle volume, lace volume or these variation volume etc. can be used.

Sheath-core type conjugate fiber of the invention, can with other fiber combinations, can also with other fibers formed mixed yarn after, by interweaving or volume being handed over to form fiber body structure,

The manufacturing method of sheath-core type conjugate fiber of the invention is as follows.

Well known melt spinning method, extension method, false twisting method for working can be used in the manufacturing method of sheath-core type conjugate fiber of the invention.

Preferably core component, sheath ingredient are dried to moisture content 300ppm or less before melt spinning by the present invention.Moisture content if 300ppm or less, the molecular weight and molecular weight that generates when can inhibit melt spinning by hydrolyzable and by moisture caused by foaming, be able to carry out stable spinning.The more preferable 100ppm of moisture content is hereinafter, most preferably 50ppm or less.

The present invention supplies in advance dried slice to screw type or hot plate type melt spinning machine, and core component is melted respectively with sheath ingredient, measured by metering pump.Then, it imported into the filament spinning component being heated in spinning manifold, after being filtered molten polymer in filament spinning component, core component and sheath ingredient are carried out by interflow by core-sheath-type composite spinning spinneret and form core sheath construction, spues to form fiber strand silk from spinning spinneret.The fiber strand silk to spue from spinning spinneret, is cooled and solidified through apparatus for supercooling, draw taking by first roller, be batched on winder by the 2nd roller, obtain batching silk.Moreover, in order to improve spinning behaviour industry, productivity, the mechanical property of fiber, it is necessary to the cartridge heater or heat-preservation cylinder of 2~20cm long be arranged in spinning spinneret lower part.Meanwhile oil supply can be carried out to fiber strand silk by feeding means, interlacing can also be carried out to fiber strand silk by interlacing device.

The spinning temperature of melt spinning can be selected accordingly according to core component, the fusing point of sheath ingredient and heat resistance etc., and preferably 240~320 DEG C.Spinning temperature is if 240 DEG C or more, since the elongation viscosity of the fiber strand silk to spue from spinning spinneret is low, spues stable, especially spinning tension is not too high, is able to suppress fracture of wire.Spinning temperature is more preferably at 250 DEG C or more, most preferably at 260 DEG C or more.On the other hand, spinning temperature is if 320 DEG C or less, can inhibit the reduction and coloring of thermal decomposition when spinning, fiber mechanical performance.Spinning temperature is more preferably at 310 DEG C hereinafter, most preferably at 300 DEG C or less.

Spinning speed when melt spinning can make appropriate choice according to the composition of core component and sheath ingredient, spinning temperature etc..After first carrying out melt spinning and batching, still further carries out extending or the spinning speed of the occasion of two sections of engineering methods of false twisting is preferably 500~6000m/ points.For spinning speed if 500m/ points or more, the operation of strand is stable, is able to suppress fracture of wire.More preferable 1000m/ points of spinning speed or more of the occasion of two sections of engineering methods, most preferably 1500m/ points or more.On the other hand, spinning speed, by inhibiting spinning tension not have fracture of wire, can be carried out stable spinning if 6000m/ points or less.The more preferable 4500m/ of the spinning speed of the occasion of two engineering methods points hereinafter, most preferably 4000m/ points or less.Meanwhile for the time being without batching, the spinning speed of the occasion for one section of engineering method that spinning and extension carry out simultaneously, low speed roller preferably 500~5000m/ points, high speed roller preferably 2500~6000m/ points.Within the above range, strand traveling is able to suppress fracture of wire while stable for low speed roller and high speed roller, can carry out stable spinning.The spinning speed of the occasion of one section of engineering method, 1000~4500m/ of more preferable low speed roller points, 3500~5500m/ of high speed roller points, most preferably 1500~4000m/ of low speed roller points, 4000~5000m/ of high speed roller points.

The multistage extension method of the occasion that one section of engineering method or two sections of engineering methods are extended, one section of extension method or two sections or more is ok.Heating means when extension do not limit the device that traveling strand can be heated directly or indirectly specifically.What heating means can specifically be enumerated has, the gas bath, laser etc. of the liquid bath of heated roller, hot needle, hot plate, warm water, hot water etc., hot sky, steam etc., but is not limited to above-mentioned enumerate.These heating means can be used alone, and also may be coextruded use.Heating means from the control of heating temperature, to being evenly heated of traveling strand, avoiding device complexity angularly considers, the preferential contact using with heated roller, the contact of hot needle, the contact with hot plate, liquid bath dipping.

The elongating temperature of the occasion extended can make appropriate choice, preferably 50~150 DEG C according to intensity, the elongation etc. of fiber after core component, the extrapolation melt initiation temperature degree of the polymer of sheath ingredient and extension.For elongating temperature if 50 DEG C or more, the strand extended to supply can be carried out sufficient preheating, and thermal deformation when extension is uniform, can inhibit the generation of fiber number spot.More preferable 60 DEG C of elongating temperature or more, most preferably 70 DEG C or more.On the other hand, elongating temperature is if 150 DEG C or less, and interfibrous caused by being able to suppress because of the contact with heated roller to melt and thermally decompose, engineering passability and quality are good.Simultaneously as the fibre lubrication extended on roller is good, fracture of wire can be inhibited, carry out stablizing extension.More preferable 145 DEG C of elongating temperature is hereinafter, most preferably 140 DEG C or less.Meanwhile 60~150 DEG C of thermal finalization can also be carried out when necessary.

Extension ratio when extension can be selected, preferably 1.02~7.0 times accordingly according to the intensity of fiber after the elongation of fiber, extension before extending and elongation etc..Extension ratio is improved if 1.02 times or more by mechanical properties such as the intensity of extension fiber and elongations.More preferable 1.2 times of extension ratio or more, most preferably 1.5 times or more.On the other hand, extension ratio can inhibit fracture of wire when extending, carry out stable extension if 7.0 times or less.More preferable 6.0 times of extension ratio is hereinafter, most preferably 5.0 times or less.

Extension speed when extension is that any one of one section of engineering method or two sections of engineering methods can be selected accordingly according to extension method.The speed of the occasion of one section of engineering method, the high speed roller of above-mentioned spinning speed is suitable with extension speed.The extension speed for the occasion that two sections of engineering methods are extended is preferably 30~1000m/ points.For extension speed if 30m/ points or more, traveling strand is stable, is able to suppress fracture of wire.More preferable 50m/ points of extension speed or more, most preferably 100m/ points or more of the occasion that two sections of engineering methods extend.On the other hand, extension speed is able to suppress fracture of wire when extension if 1000m/ points or less, carries out stable extension.The extension speed for the occasion that two sections of engineering methods are extended is more preferably 900m/ points hereinafter, most preferably 800m/ points or less.

The occasion for carrying out false twisting processing, in addition to selection is only with 1 section of heater, that is, so-called high-elastic processing, it is also an option that being processed using 1 section of heater and 2 sections of heaters, that is, so-called low bullet.The heating means of heater can use contact or contactless.What false twist processing machine can specifically be enumerated has, friction magnetic disc type, belt pulley type, safety pin type etc., but is not limited to above-mentioned enumerate.

The temperature of the heater for the occasion that false twisting processing carries out, can be selected, preferably 120~210 DEG C accordingly according to the extrapolation melt initiation temperature degree of core component, sheath component polymer.Heter temperature can be carried out the strand of supply false twisting processing and fully preheat if 120 DEG C or more, uniform along with the thermal deformation of extension, can inhibit the generation of fiber number spot.The temperature of heater is more preferably 140 DEG C More than, most preferably 160 DEG C or more.On the other hand, the temperature of heater is if 210 DEG C or less, melts and thermally decomposes due to interfibrous caused by being able to suppress because of the contact with heater, fracture of wire and reduces to the pollution of heater, and engineering passability and quality are good.More preferable 200 DEG C of the temperature of heater is hereinafter, most preferably 190 DEG C or less.

The extension ratio of the occasion of false twisting processing is carried out, the intensity and elongation etc. of fiber can make appropriate choice after the elongation of the fiber before being processed according to false twisting, false twisting are processed, and preferably 1.01~2.5 times.If extension ratio is 1.01 times or more, improved by mechanical properties such as the intensity of extension fiber and elongations.More preferable 1.2 times of extension ratio or more, most preferably 1.5 times or more.On the other hand, extension ratio is able to suppress fracture of wire when false twisting processing if 2.5 times or less, can carry out stable false twisting processing.More preferable 2.2 times of extension ratio is hereinafter, most preferably 2.0 times or less.

The process velocity for carrying out the occasion of false twisting processing, can make appropriate choice, and preferably 200~1000m/ points.For process velocity if 200m/ points or more, strand traveling is stable, can inhibit fracture of wire.More preferable 300m/ points of process velocity or more, most preferably 400m/ points or more.On the other hand, process velocity is able to suppress fracture of wire when false twisting processing if 1000m/ points or less, can carry out stable false twisting processing.The more preferable 900m/ of process velocity points hereinafter, most preferably 800m/ points or less.

In the present invention, dye when necessary, when can be to fiber or fiber body structure any state.In the present invention, dyestuff preferentially uses disperse dyes.

Colouring method of the invention, is not limited particularly, can be using liquid stream dye, drum-type dye, axis dye and dye gigging etc. according to well known method.

In the present invention, concentration and dyeing temperature to fuel be not particularly limited to, and can use well known method.Meanwhile when necessary, it can be refined before dyeing process, reduction can also be carried out after dyeing process and is cleaned.

The hygroscopicity of core-sheath-type composite spun fiber of the invention and the false twist yarn, fiber body structure that are formed by it is excellent.Therefore, it can be used for requiring the purposes of comfort and quality.For example, general dress material purposes, movement dress material purposes, bedding purposes, interior decoration purposes, goods, materials and equipments purposes etc., but it is not limited to above-mentioned enumerate.

In the following, being explained in detail by embodiment to the present invention.Meanwhile each characteristic value in embodiment with the following method by being tested.

A. core component, the hydroscopicity of sheath ingredient are poor (△ MR)

Using the polymer of core component or sheath ingredient as sample, first at 60 DEG C after heated-air drying 30 minutes, 20 DEG C of temperature, humidity 65%RH ESPEC society constant temperature and humidity machine LHU-123 in stand 24 hours, measure the weight (W1) of polymer；Then 30 DEG C of temperature, humidity 90%RH constant temperature and humidity machine in stand 24 hours, measure polymer weight be (W2).Then, heated-air drying 2 hours at 105 DEG C, the polymer weight after measuring over dry are (W3).The hydroscopicity MR1 (%) after standing 24 hours under from absolute dry condition to 20 DEG C, humidity 65%RH atmosphere is calculated according to weight W1, W3 of lower note formula polymer, the hydroscopicity MR2 (%) after standing 24 hours under absolute dry condition to 30 DEG C, humidity 90%RH atmosphere is calculated according to weight W2, W3 of lower note formula polymer, it is poor (△ MR) then to calculate hydroscopicity according to lower note formula.Also, 1 sample measures 5 times, and it is poor (△ MR) as hydroscopicity to be averaged.

MR1 (%)={ (W1-W3)/W3 } × 100,

MR2 (%)={ (W2-W3)/W3 } × 100,

Poor (△ MR) (the %)=MR2-MR1 of hydroscopicity.

B. extrapolation melt initiation temperature degree

Coring ingredient, the polymer of sheath ingredient and the fiber obtained by embodiment are as sample, using the Q2000 type differential scanning calorimeter (DSC) of TA Instruments society, measurement extrapolation melt initiation temperature degree.Firstly, the sample of 5mg is warming up to 280 DEG C from 0 DEG C with 50 DEG C/minute of heating rate under nitrogen atmosphere, 5 minutes elimination thermal histories are kept in the state of 280 DEG C.Then, from 280 DEG C of quenchings to 0 DEG C, 280 DEG C are warming up to from 0 DEG C with 3 DEG C/minute of speed again, temperature modified tone amplitude is ± 1 DEG C, and temperature heats up after 60 seconds periods of modified tone, carries out the measurement of TMDSC.According to the standard of JISK7121:1987 (measuring method of the transition temperature of plastics) 9.1, extrapolation melt initiation temperature degree is calculated according to the peak that melts observed during the 2nd rise temperature.1 sample measures 3 times, and average value is as extrapolation melt initiation temperature degree.Also, it observes multiple occasions for melting peak, extrapolation melt initiation temperature degree is calculated according to the peak that melts of lowest temperature side.

C. core/sheath compositely proportional

By the weight of the core component as sheath-core type conjugate fiber raw material and the weight of sheath ingredient, it is compound than (weight ratio) to calculate core/sheath.

D. fracture of wire

According to false twisting condition documented by each embodiment, the number of fracture of wire during processing in 10 hours is counted, returns number as fracture of wire.

E. deposit

According to false twisting condition documented by each embodiment, the heater, coldplate, friction disk, the filar guide that extend false twisting machine after processing in 10 hours are observed, [deposit does not have substantially] is calculated as ◎, [deposit has a little] is calculated as zero, [deposit is more] are calculated as △, [deposit is very more] be calculated as ×, zero with ◎ is qualification.

F. fiber number

In the environment of 20 DEG C of temperature, humidity 65%RH, with the electronic dipping machine of INTEC, the resulting fiber 100m of Example.Obtained weight is measured, calculates fiber number (dtex) with lower note formula.Also, 1 sample measures 5 times, is averaged as fiber number.

Weight (g) × 100 fiber number (dtex)=fiber 100m.

G. intensity, elongation

Intensity and elongation refer to that the fiber obtained by embodiment is calculated as sample by JIS L1013:2010 (chemical fiber filament test method) 8.5.1 benchmark.In the environment of 20 DEG C of temperature, humidity 65%RH, with the テ Application シ ロ Application UTM-III-100 type instrument of Orientec society, initial stage sample field 20cm, carry out drawing a test under conditions of drawing Zhang Sudu 20cm/ points.The stress (cN) of shown point calculates intensity (cN/dtex) divided by fiber number (dtex) when maximum loading, and the elongation (L1) of the point shown in maximum loading calculates to obtain elongation (%) by lower note formula with initial stage sample long (L0).Also, a sample test 10 is returned, and average value is as intensity and elongation.

Elongation (%)={ (L1-L0)/L0 } × 100.

H. fiber cross section outer perimeter R, expose surface portion core component length maximum value r_M, expose surface portion core component length summation r_S、r_M/R、r_S/R

The resulting fiber of embodiment is embedded with epoxy resin, freezed with the FC4E type Cryo sectioning system of Reichert society, with being cut at the Reichert-Nissei ultracut N (concave-convex microscope) for having masonry pocket knife.Then, cutting surface, that is, fiber cross section plates gas under platinum-Polarium, is observed under 1000 times using the S-4000 type electron microscope (SEM) that Hitachi manufactures, shoots the microscope photo of fiber cross section.Take out 30 at random from obtained photo, all fiber cross section outer perimeters and all exposings are measured after the length of the core component of surface portion with image processing software (three paddy business WINROOF), it takes 30 calculating average values, respectively fiber cross section outer perimeter R, exposes maximum length r in the core component of surface portion_M, expose surface portion core component length summation r_S。

Also, on each fiber cross section, exposing in the core component part on surface is the occasion at 1, and the length of this part is the maximum value r exposed in the core component length of surface portion_MAnd exposing is in the length summation r of the core component of surface portion_S.On the other hand, on the cross section of each fiber, it calculates to expose and has the occasion more than at 2 in the core component part on surface, expose on each fiber cross section in the maximum value of the core component length of surface portion and exposing after the length summation of the core component of surface portion, 30 calculation average values are taken, as the maximum value r exposed in the core component length of surface portion_M, and expose the length summation r in the core component of surface portion_S。

r_M/R、r_S/ R is the maximum value r of the core component length by the outer perimeter R, exposing of the lower note formula fiber cross section of above-mentioned calculating in surface portion_M, expose surface portion core component length summation r_SIt calculates.

Fiber cross section outer perimeter R and expose surface portion core component length maximum value r_MRatio r_M/ R=r_M/ R,

The long R of cross-sectional circumference and expose surface portion core component length summation r_SRatio r_S/ R=r_S/R。

I. refine after, the hydroscopicity after hot water treatment it is poor (△ MR)

The fiber that Example obtains is as sample, after compiling object with the cylinder that machine NCR-BL (3 inch half of kettle diameter (8.9cm), 27 needles) production 2g is compiled in English light industry rounding, in V Soda 1g/L, containing in solar corona chemistry interfacial agent BK-80 aqueous solution, it is refined under the conditions of 80 DEG C after twenty minutes, 60 minutes dry in air drier under the conditions of 60 DEG C, the cylinder after being refined compiles object.Meanwhile the cylinder after refining is compiled into object under conditions of bath raio 1:100,130 DEG C for the treatment of temperature, processing the time 60 minutes after progress hot water treatment, After sixty minutes, the cylinder after obtaining hot water treatment compiles object for drying in air drier under conditions of 60 DEG C.

Hydroscopicity (%) is to compile object with the cylinder after refining and after hot water treatment, is calculated on the basis of the moisture rate of JIS L1096:2010 (the embryo cloth test method of fabric and braided fabric) 8.10.Firstly, at 60 DEG C after heated-air drying 30 minutes, 20 DEG C of temperature, humidity 65%RH ESPEC society constant temperature and humidity machine LHU-123 in stand 24 hours, measurement cylinder compiles the weight (W1) of object；Then 30 DEG C of temperature, humidity 90%RH constant temperature and humidity machine in stand 24 hours, measurement cylinder compile object weight be (W2).Then, heated-air drying 2 hours at 105 DEG C, it is (W3) that the cylinder after measuring over dry, which compiles object weight,.The hydroscopicity MR1 (%) after standing 24 hours under from absolute dry condition to 20 DEG C, humidity 65%RH atmosphere is calculated according to weight W1, W3 of lower note formula polymer, the hydroscopicity MR2 (%) after standing 24 hours under absolute dry condition to 30 DEG C, humidity 90%RH atmosphere is calculated with weight W2, W3 that cylinder compiles object according to lower note formula, it is poor (△ MR) then to calculate hydroscopicity according to lower note formula.Also, 1 sample measures 5 times, and it is poor (△ MR) as hydroscopicity to be averaged.

MR1 (%)={ (W1-W3)/W3 } × 100,

MR2 (%)={ (W2-W3)/W3 } × 100,

Poor (△ MR) (the %)=MR2-MR1 of hydroscopicity.

J. melt

Cylinder after the hot water treatment that above-mentioned I is obtained compiles object and carries out plating gas with platinum-Polarium, and society, Hitachi Walkthrough type electron microscope (SEM) S-4000 type is observed under conditions of 1000 times, the microscope photo in 5 visuals field of random shooting.In 5 pieces of obtained photos, total be used as at the position melted is melted.

K. sheath ruptures

Cylinder after the hot water treatment that above-mentioned I is obtained compiles object and carries out plating gas with platinum-Polarium, and society, Hitachi Walkthrough type electron microscope (SEM) S-4000 type is observed under conditions of 1000 times, the microscope photo in 5 visuals field of random shooting.In 5 pieces of obtained photos, the total of the position of sheath rupture is used as sheath rent.

L. equalization

Method same as above-mentioned I is made the cylinder after refining and compiles object, the thermal finalization 2 minutes under the conditions of 160 DEG C, object is compiled to the cylinder after xeothermic sizing, in the dyeing liquor that disperse dyes Kayalon Polyester Blue UT-YA, adjustment pH value added with 1.3wt% Japan chemical drug are 5.0; 130 DEG C of bath raio 1:100, dyeing temperature, dyeing time is dyed under conditions of 60 minutes.Simultaneously, sheath ingredient is the occasion of cation dyeable polyester, in the dyeing liquor that dye of positive ion Kayacrtyl Blue 2RL-ED, adjustment pH value added with the preparation of 1.0wt% Japan chemical drug are 4.0, bath raio 1:100,130 DEG C of dyeing temperature, dyeing time are dyed under conditions of being 60 minutes.

Cylinder after dyeing compiles object, there is the panel discussion of the inspector of 5 years or more quality judging experiences by 5, it is judged to ◎ when [dyeing is very uniform, absolutely not specking], [dyeing is substantially uniform, there is no specking] it is determined as zero, [cannot say that complete and homogeneous dyes, somewhat light specking] is determined as △, [without uniform dyeing, have apparent specking] be determined as ×, the occasion of zero and ◎ is determined as qualification.

M. quality

Cylinder after above-mentioned L dyeing obtained compiles object, there is the panel discussion of the inspector of 5 years or more quality judging experiences by 5, ◎ is judged to when [absolutely not filoplume, quality are extremely excellent], [substantially without filoplume, excellent quality] it is determined as zero, [having filoplume, low quality] is determined as △, [having many filoplumes, quality extremely low] be determined as ×, zero is determined as qualification with the occasion of ◎.

N. the tone variations value △ b of hot water treatment front and back composite fibre

Object will be compiled under conditions of bath raio 1:100,130 DEG C for the treatment of temperature, processing the time 20 minutes after progress hot water treatment by cylinder made from same method with aforementioned I, 60 minutes dry in 60 DEG C of air drier, the cylinder after forming hot water treatment compiles object.It is measured object is compiled with the cylinder after hot water treatment before hot water treatment respectively with colour difference meter (USTC-datacolor), it is b1 that cylinder before hot water treatment, which compiles object b value, it is b2 that cylinder after hot water treatment, which compiles object b value, and the △ b value before and after hot water treatment, △ b=b2-b1 are calculated according to following formula.It tests 5 times and is averaged.

Embodiment 1

Using the polyethylene terephthalate of the polyethylene glycol (Sanyo chemical conversion industry PEG6000S) of combined polymerization 30wt% number-average molecular weight 8300g/mol as core component, using polyethylene terephthalate (IV=0.66) as sheath ingredient, respectively in 150 DEG C of items After being dried in vacuo 12 hours under part, it supplies by the proportion of core component 20wt%, sheath ingredient 80wt% into screw type composite spinning machine and is melted respectively, it is spued from core-sheath-type is compound with spinning spinneret (hole count: 36, section configuration: Fig. 1 (a)) under being 36g/ points in 285 DEG C of spinning temperature, discharge-amount, spins strand.Spun strand is cooled down under 20 DEG C of wind-warm syndrome, wind speed 20m/ points of cold wind, oil supply is carried out by feeding means to collect, the paragraph 1 roller of 2500m/ points of revolutions is stretched, and is batched by the 2nd section of roller of rotational speed same as first segment roller, obtain 144dtex-36f does not extend silk.Then, using false twisting machine (twisting portion: friction magnetic disc type, heater portion: contact) is extended, the obtained silk that do not extend is subjected to extension false twisting under conditions of 170 DEG C of heter temperature, 1.7 times of multiplying power, obtains the false twist yarn of 84dtex-36f.

The evaluation result of the fiber properties of obtained fiber, cloth and silk characteristic and engineering passability is as shown in table 1.It is 0 time that fracture of wire when false twisting, which returns number, and the deposit on false twisting post-heater and guide rail does not almost find that engineering passability is extremely good.Meanwhile hygroscopicity does not reduce substantially after hot water treatment, hygroscopicity is also good after hot water treatment.Also, interfibrous melt does not find, and although sheath has fraction of rupture, but equalization, quality all reach qualified horizontal.

Embodiment 2~5

Other than core/sheath compositely proportional is by change shown in table 1, false twist yarn is made in remaining method similarly to Example 1.

The evaluation result of the fiber properties of obtained fiber, cloth and silk characteristic and engineering passability is as shown in table 1.The occasion that the compositely proportional of core component and sheath ingredient changes, engineering passability and cloth and silk characteristic are good.

Embodiment 6~10

Other than section configuration shown in table 1 by changing, false twist yarn is made in remaining method similarly to Example 1.

The evaluation result of the fiber properties of obtained fiber, cloth and silk characteristic and engineering passability is as shown in table 1.The occasion of section configuration change, engineering passability, cloth and silk characteristic are good.

Embodiment 11,12

The spinneret hole number of embodiment 11 is 72,12 discharge-amount of embodiment is 28g/ point, the hole count of spinneret becomes other than 72, and false twist yarn is made in remaining method similarly to Example 1.

The evaluation result of the fiber properties of obtained fiber, cloth and silk characteristic and engineering passability is as shown in table 1.In the case that fiber number and filament number become smaller, engineering passability and cloth and silk characteristic are also good.

Embodiment 13~19, the Comparative Examples 1 to 5

Number-average molecular weight, combined polymerization rate and core/sheath compositely proportional of the combined polymerization ingredient polyethylene glycol of core component are as shown in table 2, and for comparative example 3 other than the heter temperature for extending false twisting machine becomes 150 DEG C, false twist yarn is made in remaining method similarly to Example 1.

The evaluation result for obtaining the fiber properties of fiber, cloth and silk characteristic and engineering passability is as shown in table 2.Embodiment 13~19, number-average molecular weight, combined polymerization rate and core/sheath compositely proportional change occasion of polyethylene glycol, engineering passability, the characteristic of cloth and silk are good.Hygroscopicity after comparative example 1 refines reduces, as a result, the hygroscopicity after hot water treatment is also extremely poor.Although the hygroscopicity after comparative example 2 refines is relatively high, hygroscopicity sharp fall after hot water treatment, hygroscopicity is low after hot water treatment, and engineering passability is bad, and equalization and quality are all not up to qualified horizontal.The extrapolation melt initiation temperature degree of 3 core component of comparative example is low, meanwhile, the extrapolation melt initiation temperature degree of 4 core component of comparative example is not detected, because not having crystallinity, fracture of wire and deposit are extremely more, and engineering passability is extremely bad.Meanwhile discovery has many places to melt and sheath rupture, equalization and all not up to qualified level of quality.Also, the microscope photo with sheath rupture is melted in observation, and discovery core component hygroscopic polymer has dissolution, and the dissolution of core component hygroscopic polymer causes hygroscopicity after hot water treatment to decline to a great extent after hot water treatment, and hygroscopicity is extremely low after hot water treatment.Comparative example 5 and comparative example 2 are same, although hygroscopicity is high after refining, hygroscopicity is greatly lowered after hot water treatment, and hygroscopicity is low after hot water treatment, and engineering passability is bad, equalization and quality are all not up to qualified horizontal.

Embodiment 20~28, comparative example 6~8

The number-average molecular weight of polyethylene glycol, the resulting polybutylene terephthalate (PBT) of combined polymerization rate combined polymerization as shown in table 3 are used as sheath ingredient as core component, polybutylene terephthalate (PBT) (IV=0.66), spinning temperature is 255 DEG C, core/sheath compositely proportional is as shown in table 3, other than the heter temperature for extending false twisting machine is changed to 150 DEG C, false twist yarn is made by the same method of embodiment 7 in remaining for embodiment 22, comparative example 7,8.

The evaluation result of the fiber properties of obtained fiber, cloth and silk characteristic and engineering passability is as shown in table 3.Embodiment 20~28 In, polyethylene glycol number-average molecular weight, combined polymerization rate and core/sheath compositely proportional change occasion, engineering passability and cloth and silk characteristic are good.Hygroscopicity after comparative example 6 refines is low, as a result, the hygroscopicity after hot water treatment is also extremely poor.Although the hygroscopicity after comparative example 7 refines is high, the hygroscopicity after hot water treatment is greatly lowered, and the hygroscopicity after hot water treatment is low, and engineering passability is bad, and equalization and quality are all not up to qualified level.Since the extrapolation melt initiation temperature degree of 8 core component of comparative example is low, fracture of wire and deposit are very more, and engineering passability is also extremely bad.Also, the hygroscopicity after refining is low, as a result, the hygroscopicity after hot water treatment is extremely poor.

Embodiment 29~31

The nylon 6 that polyethylene glycol (Sanyo chemical conversion industry PEG4000S) combined polymerization that core component is number-average molecular weight 3400g/mol in embodiment 29,30 obtains, for embodiment 31 other than ARKEMA system " PEBAX MH1657 " is changed, false twist yarn is made by the same method of embodiment 1 in remaining.

The evaluation result of the fiber properties of obtained fiber, cloth and silk characteristic and engineering passability is as shown in table 4.Core component becomes the occasion of polyetheramides, and engineering passability and cloth and silk characteristic are good.

Embodiment 32

Core component is the beautiful system " PAS-40N " in east, and other than the heter temperature in addition to extending false twisting machine is changed to 150 DEG C, false twist yarn is made by the same method of embodiment 1 in remaining.

The evaluation result of the fiber properties of obtained fiber, cloth and silk characteristic and engineering passability is as shown in table 4.Core component becomes the occasion of polyether ester amides, and engineering passability and cloth and silk characteristic are good.

Embodiment 33

Other than sheath ingredient is the polyethylene terephthalate (IV=0.66) of the 5-sodium sulfo isophthalate of combined polymerization 1.5mol% and the number-average molecular weight 1000g/mol polyethylene glycol (Sanyo chemical conversion industry PEG1000) of 1.0wt%, false twist yarn is made by the same method of embodiment 1 in remaining.

The evaluation result of the fiber properties of obtained fiber, cloth and silk characteristic and engineering passability is as shown in table 4.Sheath ingredient uses the occasion of cation dyeable polyester, and engineering passability and cloth and silk characteristic are good.

Comparative example 9

Other than section configuration is changed to as shown in Figure 2, false twist yarn is made by the same method of embodiment 1 in remaining.

The evaluation result of the fiber properties of obtained fiber, cloth and silk characteristic and engineering passability is as shown in table 4.There is no fracture of wire, almost do not find deposit, engineering passability is good.But although not melting, since core component hygroscopic polymer is wrapped up by sheath ingredient completely, with the volume expansion of hygroscopic polymer when hot water treatment, many places sheath partial rupture is found.As a result, equalization and quality are all not up to qualified horizontal.

Comparative example 10,11

The embodiment 2,4 with reference to documented by Japanese Laid-Open Patent Publication 6-200473 bulletin, core component is the combined polymerization polyethylene terephthalate of the polyethylene glycol of 17wt% average molecular weight 3000g/mol in comparative example 10, and sheath ingredient is polyethylene terephthalate (IV=0.66)；Core component is the combined polymerization polyethylene terephthalate of the polyethylene glycol of 17wt% average molecular weight 3000g/mol in comparative example 11, sheath ingredient is nylon 6, other than core/sheath compositely proportional changes as shown in table 4, false twist yarn is made by the same method of embodiment 7.

The evaluation result of the fiber properties of obtained fiber, cloth and silk characteristic and engineering passability is as shown in table 4.Comparative example 10,11 fracture of wires and deposit are more, and engineering passability is bad.Meanwhile discovery is melted and sheath rupture, equalization and quality all do not reach qualified horizontal.Also, the microscope photo with sheath rupture is melted in observation, and discovery core component hygroscopic polymer has dissolution, and the dissolution of core component hygroscopic polymer leads to hygroscopicity sharp fall after hot water treatment after hot water treatment, and hygroscopicity is low after hot water treatment.

Comparative example 12

The embodiment 1 with reference to documented by Japanese Laid-Open Patent Publication 9-13257 bulletin, core component is the combined polymerization polyethylene terephthalate (IV=0.66) of 3.5mol% 5-sodium sulfo isophthalate salt, sheath ingredient is the combined polymerization nylon 6 of 8wt% average molecular weight 20000g/mol polyethylene glycol, other than core/sheath compositely proportional changes as shown in table 4, false twist yarn is made by the same method of embodiment 1.

The evaluation result of the fiber properties of obtained fiber, cloth and silk characteristic and engineering passability is as shown in table 4.Since sheath ingredient is to inhale Moist polymer, exposing is more in the hygroscopic polymer part on surface, and there are many fracture of wire and deposit, and engineering passability is bad.Meanwhile discovery is melted and sheath rupture, equalization and quality all do not reach qualified horizontal.Also, hygroscopicity is low after hot water treatment.

Comparative example 13

The embodiment 1 with reference to documented by special open 2007-131980 bulletin, core component is the combined polymerization polyethylene terephthalate of 30wt% average molecular weight 5000g/mol polyethylene glycol, sheath ingredient is the combined polymerization polyethylene terephthalate (IV=0.66) of 1.5mol% 5-sodium sulfo isophthalate salt and 1.0wt% weight average molecular weight 1000g/mol polyethylene glycol, other than core/sheath compositely proportional changes as shown in table 4, false twist yarn is made by the same method of embodiment 7.

The evaluation result of the fiber properties of obtained fiber, cloth and silk characteristic and engineering passability is as shown in table 4.Fracture of wire and deposit are more, and engineering passability is bad.Meanwhile discovery is melted and sheath rupture, equalization and quality all do not reach qualified horizontal.Also, the microscope photo with sheath rupture is melted in observation, it is found that the hygroscopic polymer of core component has dissolution, and the dissolution of core component hygroscopic polymer leads to hygroscopicity sharp fall after hot water treatment after hot water treatment, and hygroscopicity is low after hot water treatment.

Comparative example 14

In addition to core component is polyethylene terephthalate (IV=0.66), sheath ingredient has been made other than change for the polyethylene terephthalate (IV=0.66) of combined polymerization 1.5mol% 5-sodium sulfo isophthalate salt, the polyethylene glycol (Sanyo chemical conversion industry PEG1000) of 1.0wt% number-average molecular weight 1000g/mol, and false twist yarn is made by the same method of embodiment 1 in remaining.

The evaluation result of the fiber properties of obtained fiber, cloth and silk characteristic and engineering passability is as shown in table 4.There is no fracture of wire, there is no discovery deposit, engineering passability is good.Meanwhile also not melting and being ruptured with sheath, dyeability and quality are good, and since core component and sheath ingredient are not hygroscopic polymers, hygroscopicity is extremely poor.

Comparative example 15,16

In addition to the r of fiber cross section_M/R、r_SSpinning spinneret/R as shown in table 4 has been made other than change, and false twist yarn is made by the same method of embodiment 7 in remaining.

The evaluation result of the fiber properties of obtained fiber, cloth and silk characteristic and engineering passability is as shown in table 4.Comparative example 15 does not have fracture of wire, and also without discovery deposit, engineering passability is good.Although the hygroscopicity after hot water treatment is good, r_M/R、r_S/ R is also small, but since the exposing of core component hygroscopic polymer is few in surface portion, as the volume expansion discovery many places sheath portion point of core component is ruptured, equalization and all not up to qualified level of quality.R in comparative example 16_M/R、r_S/ R is big, since the exposing of core component hygroscopic polymer is more in the part on surface, causes fracture of wire and deposit all to compare more.Meanwhile although the hygroscopicity after hot water treatment is good, the position melted is very more, and equalization and quality are all not up to qualified horizontal.

Comparative example 17

Other than core sheath compositely proportional changes as shown in table 4, false twist yarn is made by the same method of embodiment 1 in remaining.

The evaluation result of the fiber properties of obtained fiber, cloth and silk characteristic and engineering passability is as shown in table 4.There is no fracture of wire, basic no discovery deposit, engineering passability are good.Simultaneously as the compositely proportional of core component hygroscopic polymer is low, the hygroscopicity after hot water treatment is low.Also, r_M/R、r_S/ R is small, and since hygroscopic polymer exposing is few in surface portion, as the volume expansion discovery of core component has sheath partial rupture, equalization and quality are all not up to qualified horizontal.

Comparative example 18

Other than using single composition spinning spinneret (hole count: 36, circular hole), false twist yarn is made by the same method of embodiment 1 in remaining.

The evaluation result of the fiber properties of obtained fiber, cloth and silk characteristic and engineering passability is as shown in table 4.Due to being the fiber of hygroscopic polymer formation, fracture of wire and deposit are very more, and engineering passability is bad.Although the hygroscopicity after hot water treatment is very high, discovery many places are melted, and equalization and quality are all not up to qualified horizontal.

Claims (14)

1. A kind of sheath-core type conjugate fiber, it is characterised in that: the core component and sheath ingredient of the sheath-core type conjugate fiber are crystalline polymer, and core component is hygroscopic polymer；At least a part of core component is exposed on surface on the cross section of the sheath-core type conjugate fiber, and the long R of cross-sectional circumference and exposes the length summation r in the core component of surface portion_SRatio r_S/ R is 0.05~0.40；The extrapolation melt initiation temperature degree of the sheath-core type conjugate fiber is at 150 DEG C or more, and the hydroscopicity difference △ MR after hot water treatment is 2.0~10.0%.
2. Sheath-core type conjugate fiber according to claim 1, it is characterised in that: the long R of the cross-sectional circumference of the sheath-core type conjugate fiber and expose surface portion core component length maximum value r_MRatio r_M/ R is 0.01~0.20.
3. Sheath-core type conjugate fiber according to claim 1 or 2, it is characterised in that: the weight ratio of the core component and sheath ingredient is 10/90~70/30.
4. Described in any item sheath-core type conjugate fibers according to claim 1~3, it is characterised in that: the tone variations value △ b of composite fibre is 3.0 or less before and after hot water treatment.
5. Sheath-core type conjugate fiber according to any one of claims 1 to 4, it is characterised in that: contain half hindered phenol anti-oxidants of structure as shown in Equation 1 in the sheath-core type conjugate fiber；

   Wherein, half hindered phenol anti-oxidants that R1 is hydrocarbon, oxygen, any combination is formed in nitrogen, half hindered phenol anti-oxidants that R2 is hydrogen, any one combines formation in hydrocarbon, oxygen, nitrogen.
6. Described in any item sheath-core type conjugate fibers according to claim 1~5, it is characterised in that: the hygroscopic polymer of the core component is using polyethers as at least one of the polyether ester of combined polymerization ingredient, polyetheramides, polyetheramides ester.
7. Sheath-core type conjugate fiber according to claim 6, it is characterised in that: for the polyether ester using aromatic binary carboxylic acid and aliphatic dihydroxy alcohol as main composition, polyethers is combined polymerization ingredient.
8. Sheath-core type conjugate fiber according to claim 7, it is characterised in that: the aliphatic dihydroxy alcohol is ethylene glycol, and the number-average molecular weight of the polyethers is 4000~30000g/mol.
9. Sheath-core type conjugate fiber according to claim 8, it is characterised in that: the combined polymerization rate of polyethers is 10~35wt%.
10. Sheath-core type conjugate fiber according to claim 7, it is characterised in that: the aliphatic dihydroxy alcohol is 1,4-butanediol, and the number-average molecular weight of the polyethers is 2000~30000g/mol.
11. Sheath-core type conjugate fiber according to claim 10, it is characterised in that: the combined polymerization rate of polyethers is 10~60wt%.
12. Described in any item sheath-core type conjugate fibers according to claim 1~11, it is characterised in that: the sheath ingredient is cation dyeable polyester.
13. The false twist yarn twisted and formed is closed by any one of 2 or more claims 1~12 sheath-core type conjugate fiber.
14. A kind of at least part uses the fiber body structure of false twist yarn described in any one of claim 1~12 sheath-core type conjugate fiber and/or claim 13.