JP4064188B2 - Biodegradable false twisted spun yarn and woven / knitted fabric - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a biodegradable false-twisted spun yarn in which the binder fiber is biodegradable and contains at least a biodegradable short fiber composed of an aliphatic polyester polymer or an aliphatic polyester amide copolymer, and The present invention relates to a woven or knitted fabric composed of the biodegradable false twist spun yarn.
[0002]
[Prior art]
There are various factors that determine the value of clothing, but it can be broadly divided into wear resistance, dimensional stability, functionality such as wash and wear, texture, and texture such as tailoring.
Synthetic fibers are superior to natural fibers as compared to natural fibers, but the latter is decisively inferior. However, it has been differentiated in various ways to meet the needs of the times. The technique is represented by (1) Ingenuity of raw yarn manufacturing such as polymer improvement and addition of additives, (2) Ingenuity of yarn processing using high-order false twisting technology, (3) Ingenuity of arrangement and dyeing conditions, and the above three techniques As a result of these advanced composites, it has grown to a value of “new synthetic fiber”, which has a value that surpasses the texture of natural fibers.
[0003]
However, if this new synthetic fiber is pursued with a high texture, it will require more advanced processing, and if it is finished to the same level or higher than that of natural fibers, there will be a problem of higher costs, and there are problems such as the use being limited to high-grade zones. there were. Also, in recent years, the diversification of orientation has progressed, and there has been a return to the original material (natural fiber) feeling and further functional enhancement, and there are various ways of dealing with it. In particular, attention has been focused on products that combine the natural texture of natural fibers and the high functionality of synthetic fibers, which has been the focus of recent years, and long / short fiber composite technology has become the mainstream of handling methods.
Long and short fiber composite technology includes union, untwisting, arrangement, etc. All combinations are considered according to the application, and it is positioned as the next technology of the “new synthetic fiber” generation.
[0004]
Traditionally, the texture required for clothing is based on the “soft” part such as natural, soft, and swelled, and the “strength” part such as stretch, tension, and coolness is added according to the application. There were many, but in the diversification of orientation mentioned above, cases where the requirements of “soft” and “go” are intertwined, and cases where one of the elements of “soft” and “go” is emphasized than before A part that cannot be covered only by the above-mentioned long and short fiber composite technology has started to appear. For example, based on the natural feeling of natural fibers and the refreshing feeling of synthetic fibers, when elements are added according to the purpose, or the natural feeling of regenerated fibers / natural fibers is further enhanced using regenerated fibers / natural fibers. Is the case.
[0005]
The former is solved by using a processed yarn of natural fibers with a refreshing feeling. For example, Japanese Examined Patent Publication No. 57-8218 discloses a method for producing untwisted spun yarn by false twisting a blended yarn of two or more components and adhering single fibers constituting a fiber bundle to each other. According to the present invention, the selection of the constituent fibers and the provision of the false twisting temperature can provide a twisted spun yarn having both soft feeling of regenerated fiber / natural fiber, natural feeling and appropriate bending strength of synthetic fiber, and dry feeling. Since an aromatic polyester copolymer or polycapramide is used as a component, the false twisting temperature is high, and there are problems such as yellowing of natural fibers or reduction in texture due to burning of fluff. Also, in Japanese Examined Patent Publication No. 48-41784, false twist spinning that has both soft feeling and dry feeling by using a core-sheath type composite fiber in which a polymer having a melting point difference is arranged in a binder component and melting only a low melting point component. Although a method for producing a yarn is disclosed, this invention also has the same problem as the above-mentioned Japanese Patent Publication No. 57-8218.
[0006]
Thus, the technical idea of expressing the natural feeling of natural fibers and the refreshing feeling of synthetic fibers simultaneously by false twisting the spun yarn containing the binder component has been known for a long time.
Further, a binder component having a low melting point was later developed, and JP-A-60-181331 discloses an adhesive spun yarn comprising a binder component having a melting point of 150 ° C. or lower. Since it is only bonded, it lacks softness and bulkiness. Moreover, in JP-A-8-246240 and JP-A-9-310227, improvement of soft feeling is achieved by using a composite fiber having a sheath component mainly composed of syndiotactic polypropylene as a binder. Both inventions are required to cope with environmental problems that have been increasing in recent years, that is, replacement with biodegradable materials from the viewpoint of environmental protection, but there are still problems such as failure to respond.
[0007]
On the other hand, in the latter case, when the natural feeling of the regenerated fiber / natural fiber is further emphasized by using the regenerated fiber / natural fiber, it is disclosed in, for example, Japanese Patent Publication No. 48-41784 and Japanese Patent Application Laid-Open No. 50-155. One of the countermeasures is a technical idea of improving the soft feeling and the swelling feeling by removing the binder component after the fused untwisted spun yarn is made into a woven or knitted fabric. However, these also have problems such as a high melt bonding temperature as mentioned above and a risk of damaging the main recycled fibers and natural fibers, such as using a high concentration of acid to remove the adhesive components.
[0008]
[Problems to be solved by the invention]
The present invention has been made in view of such a current situation, and has a natural feeling of natural fibers, a soft feeling and a refreshing feeling of synthetic fibers, and a dry feeling, which cannot be expressed by conventional new synthetic fibers and long and short fiber composite technologies. Furthermore, there is a technical problem in providing false twisted spun yarn and woven or knitted fabric that have both biodegradability and can develop various expressions and senses by applying twisting, weaving, and arraying with other fibers. .
Furthermore, in the present invention, there is also a technical problem in providing a woven or knitted fabric that can express the characteristics of the false-twisted spun yarn without damaging the characteristics of the regenerated fiber / natural fiber.
[0009]
[Means for Solving the Invention]
  As a result of intensive studies on the melting temperature, solvent solubility and biodegradability in the binder component of false twisted spun yarn, the expression of the woven or knitted fabric using the false twist spun yarn, and the possibility of differentiation, the inventor has reached the present invention. did.
  That is, the present invention provides the following (1) to (4).
(1) a short fiber containing at least one of regenerated fiber or natural fiber;,With binder fiberMixing ratio 5: 95-30: 70Blended or multi-layereddidFalse twist the fiber bundleBecomeFalse twisted yarn in which the short fibers are fused to each otherBecauseBinder fiberThe core portion is made of a biodegradable thermoplastic polymer having a high melting point, and the sheath portion is made of a biodegradable thermoplastic polymer having a melting point lower than that of the polymer;AndAmphoteric degradable thermoplastic polymerA biodegradable false-twisted spun yarn characterized by being a biodegradable composite staple fiber made of an aliphatic polyester polymer or an aliphatic polyesteramide copolymer.
(2)corePartsBiodegradable thermoplastic polymerIs a polylactic acid polymer having a stereocomplex with a crystal melting start temperature of 180 ° C. or higherAndMake up the sheathBiodegradable thermoplastic polymerHas a melting point lower than the melting point of the polymer constituting the core,Both polymersThe melting point difference is 30 ° C. or more (1) Biodegradable false twisted spun yarn.
(3) (1) or (2A knitted or knitted fabric characterized in that the biodegradable false-twisted spun yarn described in (1) is at least a part of its configuration.
(4) (3) Woven and knitted fabricsFrom baBulky woven or knitted fabric characterized by dissolving and removing inder fibers.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is described in detail below.
The regenerated fiber or natural fiber used in the present invention is not particularly limited as long as it has biodegradability. For example, in the case of recycled fiber, viscose rayon, cupra, solvent-spun cellulose fiber and the like are mentioned, and in the case of natural fiber, cotton, wool, silk and the like are mentioned. The fiber form is a short fiber, and a plurality of these fibers can be mixed and used according to the purpose. The mixing method and the mixing ratio are not particularly limited. For example, the respective fibers are mixed in the blended cotton process, and a method in which each fiber is subjected to carding, kneading, roving, or each fiber is spun up to the card process, and then kneaded. A method of combining with a sliver in the strip process, a method of aligning and roving a plurality of slivers obtained by independently kneading each fiber, or preparing a roving of each fiber, and combining them in a fusion false twisting process described later There are methods. In addition, if you want to express a feeling of dullness, use fibers with different gloss and dyeing performance. In addition to combinations with different dyeing performance such as viscose rayon and wool, appropriate amounts of raw cotton or atypical cross-section fibers manufactured by mixing colorants at the time of fiber manufacture, and fibers with different matting agent contents By mixing, you can express the sensation of different luster and hue after dyeing.
[0011]
As described above, there are no restrictions on the use of a plurality or a single unit depending on the application and purpose. The thickness and length of the staple can be arbitrarily selected, and when the regenerated fiber or natural fiber is a long fiber, it is mechanically cut into a predetermined length. A single fiber fineness of 1 to 3 dTex and an average fiber length of 30 to 50 mm are preferable ranges. If it is thicker than 3dTex, the number of fibers constituting the spun yarn is reduced, draft spots and yarn breakage occur frequently, and it becomes difficult to produce a practical spun yarn. Also, if the average fiber length is longer than 50 mm, it becomes difficult to control the fiber during spinning draft, the occurrence of spots and neps, the fibers protruding from the surface of the spun yarn, so-called fluff, and the yarn quality of the spun yarn are reduced. As a result, the appearance of the woven or knitted fabric tends to be significantly impaired. On the other hand, if it is less than 30 mm, the uniformity is lowered, which is not preferable.
On the other hand, mechanical crimping using a stuffing box before cutting, or crimping by heat treatment can be arbitrarily performed depending on the purpose.
[0012]
As described above, the regenerated fiber or natural fiber used in the present invention can be selected depending on the purpose. However, the solvent-spun cellulose is considered comprehensively from the viewpoint of production such as profitability and operability, practicality and versatility. The fiber “Lyocell” (manufactured by Lenzing) or “Tencel” (manufactured by Tencel) or cotton alone is most desirable.
[0013]
Next, the binder fiber will be described.
The binder fiber used in the present invention is a short fiber having a biodegradable and at least thermoplastic aliphatic polyester polymer or aliphatic polyesteramide copolymer, and the aliphatic polyester polymer includes , Polyaliphatic hydroxycarboxylic acids, and polycondensates of aliphatic polyhydric alcohols and aliphatic dicarboxylic acids.
[0014]
Examples of the polyaliphatic hydroxycarboxylic acid include poly (α-hydroxy acid) such as polyglycolic acid and polylactic acid, and copolymers having these as main repeating units. Other examples include poly (ω-hydroxyalkanoates) such as poly (ε-caprolactone) and poly (β-propiolactone). Poly (β-, such as poly-3-hydroxypropionate, poly-3-hydroxybutyrate, poly-3-hydroxycapronate, poly-3-hydroxyheptanoate, poly-3-hydroxycocanoate Hydroxyalkanoates) and copolymers of these repeating units with repeating units of poly-3-hydroxyvalerate or poly-4-hydroxybutyrate.
[0015]
On the other hand, in the example of the polycondensate of aliphatic polyhydric alcohol and aliphatic dicarboxylic acid, there is a polyalkylene alkanoate composed of a condensation polymer of glycol and dicarboxylic acid, specifically, polyethylene noxalate, polyethylene succinate, Examples include polyethylene adipate, polyethylene azelate, polyethylene oxalate, polybutylene succinate, polybutylene adipate, polybutylene sebacate, polyhexamethylene sebacate, polyneopentyl oxalate and the like. Moreover, the polyalkylene alkanoate copolymer which makes these the main repeating units is also mentioned.
[0016]
In the present invention, a polylactic acid-based polymer can be particularly preferably used among the above-mentioned polymers from the viewpoints of biodegradability, melting point and practicality. When the aliphatic polyester-based polymer is a polylactic acid-based polymer, in addition to poly-D-lactic acid, poly-L-lactic acid, a copolymer of D-lactic acid and L-lactic acid due to the presence of optical isomers, D And a copolymer of at least one of L-lactic acid and an aliphatic hydroxycarboxylic acid described later.
[0017]
Examples of the hydroxycarboxylic acid in producing a copolymer of lactic acid and aliphatic hydroxycarboxylic acid include glycolic acid, hydroxybutyric acid, hydroxyvaleric acid, hydroxypentanoic acid, hydroxycaproic acid, hydroxyheptanoic acid, hydroxyoctanoic acid, and the like. Can be mentioned. Of these, use of hydroxycaproic acid or glycolic acid is desirable from the viewpoint of low cost.
[0018]
The physical properties of the aliphatic polyester polymer are not particularly limited as long as the fusion false twisting process described below is not hindered. However, considering the spinning process, the weaving process and the dyeing process, the melting point is 150 ° C. or higher, and the tensile strength is It is desirable that it is in the range of 3.5 cN / dTex or more and elongation of 20 to 60%.
[0019]
Further, the adhesive component in the present invention includes the above-described aliphatic polyester polymer, polycoupleramide (nylon 6), polytetramethylene adipamide (nylon 46), polyhexamethylene adipamide (nylon 66), polyundecanamide. Short fibers made of an aliphatic polyesteramide copolymer that is a polycondensate with an aliphatic polyamide polymer such as (nylon 11) and polylaurolactam (nylon 12) are also preferably used.
[0020]
On the other hand, the binder fiber in the present invention has a core-sheath structure composed of two kinds of polymers having different melting points of 20 to 110 ° C. selected from the above-mentioned polymers, in addition to the above-mentioned binder fiber. It is desirable that the core is a core-sheath composite short fiber having a structure made of a biodegradable thermoplastic polymer having a high melting point and a sheath made of a biodegradable thermoplastic polymer having a melting point lower than that of the polymer. . This does not melt all the binder fibers, but melts only the sheath part and maintains the fiber form of the core part, so that a moderate cooling feeling can be applied to the woven or knitted fabric using the biodegradable false twisted yarn of the present invention. , Dryness, naturalness, softness, bulkiness and flexibility. Of course, when at least one of the above-mentioned aliphatic polyester polymer or aliphatic polyester amide copolymer is included in the binder fiber, not all the binder fiber is melted but only the surface is involved in the fusing temperature. It is important to set When all the binder fibers are melted, the bending degradability of the biodegradable false-twisted spun yarn is too large, and it tends to be hard and harsh.
In this core-sheath composite short fiber, if the difference between the melting points of the two polymers is less than 20 ° C., the temperature setting in the fusion false twisting process becomes severe and unsuitable for practical use. On the other hand, if the difference in melting point exceeds 110 ° C., the difference in melting point between the two polymers is too large. Therefore, when performing composite spinning using both polymers, it becomes difficult to control the spinning temperature in the spinning nozzle pack. Accordingly, in the present invention, the melting point difference is desirably 20 ° C. or higher, more preferably 30 ° C. or higher. In addition, since practicality as clothes is lost unless certain heat resistance is provided, the melting point of the thermoplastic polymer in the sheath is preferably 150 ° C. or higher. In this composite short fiber, it is desirable that the composite ratio, that is, the weight ratio of the polymer in the sheath to the polymer in the core is 1/5 to 5/1. When the ratio of the polymer in the sheath portion to the polymer 1 in the core portion exceeds 5, the strength of the short fibers is reduced, or the melted portion is too much and the texture of the woven or knitted fabric becomes hard. On the other hand, if the ratio of the polymer in the sheath portion to the polymer component 5 in the core portion is less than 1, it is not preferable because the short fibers cannot be sufficiently fused between the fibers and the strength is reduced. . Therefore, in the present invention, the composite ratio is 1/5 to 5/1, preferably 1/2 to 2/1.
[0021]
Next, the desirable aspect in the said composite short fiber is mentioned.
The component constituting the core of the composite short fiber is composed of a polylactic acid polymer forming a stereocomplex with a crystal melting start temperature of 180 ° C. or higher, and the component constituting the sheath constitutes the core. It is desirable that the melting point is lower than the melting point of the components, and the difference in melting point is 30 ° C. or more.
[0022]
First, the polylactic acid stereocomplex will be described.
Polylactic acid stereocomplex means that poly L-lactic acid has a left-handed helical structure, whereas the optical isomer poly-D-lactic acid has a right-handed helical structure. Bonding occurs, and a crystal structure closer and stronger than the crystal structure formed when poly L-lactic acid or poly D-lactic acid is used alone is formed. This crystal structure is called a stereo complex. By forming this stereocomplex, the melting point of the polylactic acid polymer is increased and the heat shrinkage rate is also decreased.
[0023]
To obtain a polylactic acid stereocomplex, there are a method in which poly L-lactic acid and poly D-lactic acid are individually melted and then mixed in a solution, and a method in which poly L-lactic acid pellets and poly D-lactic acid pellets are mixed and then melted. Any method may be used.
The mixing ratio is preferably D / L = 40/60 to 60/40, most preferably equivalent. If this mixing ratio is deviated, formation of a stereocomplex that is a stereospecific bond is inhibited, and it becomes difficult to set the crystal melting start temperature to 180 ° C. or higher.
[0024]
The polylactic acid stereocomplex constitutes the core part of the binder fiber, and its crystal melting start temperature is preferably 180 ° C. or higher, and the melting point difference from the component constituting the sheath part is preferably 30 ° C. or higher. The crystal melting start temperature is the melting start temperature of the high-temperature crystal melt phase, which means the onset temperature of the endothermic peak of the high-temperature melt crystal phase, and the DSC curve slope of the low-temperature endothermic peak is the maximum. The temperature at the point where the tangent line drawn in step 1 intersects with the straight line extending from the low-temperature base line to the high-temperature side.
In order to make the woven or knitted fabric using the biodegradable false-twisted spun yarn of the present invention have an appropriate refreshing feeling, dry feeling, natural feeling, soft feeling, bulkiness and flexibility, only the sheath portion is melted and the core is made. It is desirable to keep the fiber form of the part, and when the melting point of the core / sheath part approaches, the false twisting temperature setting becomes so severe that it becomes unpractical. Therefore, the difference in melting point between the core and the sheath is preferably 30 ° C. or more. Further, if the crystal melting start temperature of the polylactic acid stereocomplex constituting the core part is less than 180 ° C., the component constituting the sheath part has a lower melting point, and a woven fabric using a biodegradable false twisted yarn later. There is a risk that it will not be able to withstand heat treatments that are performed daily, such as ironing the knitted fabric.
[0025]
The binder fibers described in detail above are all biodegradable short fibers, which are used alone or in combination with the above-described polymer, or mixed with other biodegradable binder fibers. And it can manufacture efficiently, for example with the following method. The polymer is melt-spun from a spinneret having a plurality of spinning holes, taken out after cooling the spun long fiber group, and converged into an unstretched tow exceeding about 100,000 dTex. Is drawn using a multi-stage heat roller drawing device to form a drawn tow, and cut into a predetermined length to form a short fiber. At this time, the fineness and the fiber length can be arbitrarily selected. However, since false twisting is later performed together with the regenerated fiber or the natural fiber, the fineness of 1 to 3 dTex and the fiber length of 30 to 50 mm are desirable in terms of uniformity.
The spinning temperature at the time of melt spinning depends on the melting point and degree of polymerization of the polymer to be used, but it is usually desirable to be 120 to 300 ° C. When the spinning temperature is less than 120 ° C, it becomes difficult to melt and extrude the polymer. On the other hand, when the spinning temperature exceeds 300 ° C, the polymer is significantly decomposed and high-strength fibers cannot be obtained. It is not preferable. The total draw ratio when the undrawn long fiber yarn is drawn depends on the strength level of the target short fiber, but is usually 2.0 to 4.0 times, whereby the tensile strength is 3.5 cN / dTex or more. , Short fibers having an elongation of 20 to 60% or more can be obtained.
[0026]
The cross-sectional shape of the short fiber is not limited at all, and may be any shape such as a round shape, an elliptical shape, a rhombus shape, a triangular shape, a T shape, and a well shape. In particular, when the shape has an acute angle portion such as a triangular shape or a well shape, the fusion form is close to point adhesion, the bending rigidity of the biodegradable false twisted yarn of the present invention is lowered, and the natural feeling of the woven or knitted fabric is reduced. , Softness, bulkiness and flexibility are improved.
Furthermore, in order to promote the effect of point bonding, it is also a preferable aspect to perform mechanical crimping using a stuffing box or crimping by heat treatment before cutting into such short fibers.
In addition, various additives such as matting agents, pigments, light stabilizers, heat stabilizers, antioxidants and the like may be added to the short fibers within a range that does not impair the effects of the present invention. it can.
[0027]
The biodegradable false-twisted spun yarn of the present invention can be obtained by blending a short fiber containing regenerated fiber or natural fiber and the binder fiber into a mixed or multi-layered form and fusing false twist.
The blended yarn and the multilayer yarn are produced by a known method. For example, the blended yarn is produced through the previously described blended cotton process and kneading process, and the mixing ratio of the recycled fiber, natural fiber and binder fiber is appropriately determined according to the purpose. In the multi-layer yarn, a plurality of slivers are supplied side by side in a draft area of the roving machine, and at least one sliver is used as a core, and the other sliver is wound to obtain a roving yarn. Each sliver is configured with an arbitrary mixing ratio of the recycled fiber, natural fiber, and binder fiber according to the purpose.
The mixing ratio of the binder fiber and the other short fibers in the biodegradable false twist spun yarn of the present invention is preferably 5:95 to 30:70. When the mixing ratio of the binder fibers is less than 5%, the effect of heat-sealing is small, and pilling due to fiber removal is likely to occur when a woven or knitted fabric is formed. When the mixing ratio of the binder fibers exceeds 30%, the heat fusion proceeds too much and the texture of the woven or knitted fabric becomes hard.
[0028]
The blended yarn or the multi-layer yarn containing the binder fiber described above is formed into a roving yarn or a fine spinning yarn and then fused and false twisted. However, in this case, it is desirable to produce a so-called “twisted spun yarn” in which the roving is drafted 15 to 25 times and false twisted continuously. When the spun yarn is fused and twisted, the woven or knitted fabric gives a sense of elasticity and dryness, but it may lack some natural feeling and bulkiness. In this, fine spinning is twisted (usually twisting in the range of a twisting factor of 3.0 to 4.2. K = T / N^1/2   However, since T: number of twists / 2.54 cm, N: cotton count, K: twist coefficient), there are few gaps between the fibers (staples) from the beginning, and the gaps are further reduced by fusing.
[0029]
On the other hand, although it is a fusion false twisting method, a known method in which twisting-heating-untwisting is continuously performed is used. As an example, after supplying the roving yarn to a draft device, it is fused and fixed by a heater (non-contact) while being twisted by a false twisted twisted body, and wound around a package by a winding roller via a delivery roller.
The false twisted twisted body is not particularly limited as long as it is a false twisted twisted body capable of imparting a turning force to the blended yarn or the multi-layered yarn, such as a friction pin, a belt nip, a fluid swirling device, in addition to a spindle pin. However, the fluid swirl device is preferable in consideration of quality and efficiency reduction due to fluff. Furthermore, an additional effect can be aimed at by this fusion false twisting process. For example, in order to obtain the spot effect, it is preferable to intermittently perform twisting operations to alternately form twisted converging portions and reverse twist converging portions.
[0030]
A woven or knitted fabric is obtained using the biodegradable false twisted yarn of the present invention thus obtained. The weaving and knitting process is preferably sized using a known method. The loom is not particularly limited, but a rapier loom is preferable in consideration of versatility.
The woven or knitted fabric using only the biodegradable false-twisted spun yarn of the present invention has an appropriate refreshing feeling, dry feeling, natural feeling, soft feeling, bulkiness and flexibility, but should be combined with other yarns. Thus, a higher effect can be achieved.
The composite method may be arbitrarily performed according to the use and purpose. Specifically, there are knots, knits, arrangements, and the like. If it is desired to develop a stretch, latent crimped yarns may be used, ultrafine yarns may be used for peach feeling, and cationic dyed yarns may be used for chambray tones. The knitting and knitting structure is not particularly limited.
[0031]
As described above, the woven and knitted raw machine is subjected to a known dyeing process. For example, after scouring, the binder fiber is dyed with a disperse dye, and after reductive cleaning, the regenerated fiber / natural fiber is dyed with a reactive dye in the presence of alkali.
[0032]
On the other hand, in order to further express the characteristics of the regenerated fiber / natural fiber without impairing the characteristics, the adhesive component is removed with an alkaline solution or the like during the dyeing process. As a result, a bulky woven or knitted fabric with further enhanced natural feeling, soft feeling and bulging feeling can be obtained.
[0033]
[Action]
The biodegradable false-twisted spun yarn of the present invention is obtained by falsely twisting a fiber bundle obtained by blending a short fiber containing at least one of regenerated fiber or natural fiber and a binder fiber into a multi-layered form. Although the fibers are fused together, the binder fiber is a biodegradable short fiber containing at least an aliphatic polyester polymer or an aliphatic polyester amide copolymer, so that it has biodegradability. Has an effect. In addition, the binder fiber is not melted completely, but by maintaining the fiber form, the biodegradable false twisted spun yarn has an effect of imparting a natural feeling, soft feeling, bulkiness and flexibility. In particular, the binder fiber is a core-sheath composite short fiber, the core part is made of a biodegradable thermoplastic polymer having a high melting point, and the sheath part is made of a biodegradable thermoplastic polymer having a lower melting point than the polymer. As a mode in which a degradable composite short fiber is desirable and further reflects the above-described action, in the core-sheath composite short fiber, a component constituting the core part forms a stereocomplex with a crystal melting start temperature of 180 ° C. or higher. A biodegradable false-twisted spun yarn comprising a polylactic acid-based polymer and having a melting point lower than the melting point of the component constituting the core, and the melting point difference being 30 ° C. or higher. It is done.
[0034]
In addition, the woven or knitted fabric using only the biodegradable false twisted yarn of the present invention has an effect of expressing an appropriate refreshing feeling, dry feeling, natural feeling, soft feeling, bulkiness and flexibility, but is combined with other yarns. By doing so, a higher effect can be produced. If the binder fiber contained in the biodegradable false-twisted spun yarn is removed, the natural feeling and soft feeling are increased as compared with the original material and the bulkiness is increased.
[0035]
【Example】
EXAMPLES Next, although this invention is demonstrated concretely based on an Example, this invention is not limited at all by these Examples.
Melting point (° C.): Measured with a differential scanning calorimeter DSC-2 manufactured by Perkin Elma Co., Ltd. under a temperature rising rate of 20 ° C./min. .
Crystal melting start temperature (° C.): Using a differential scanning calorimeter DSC-2 manufactured by Perkin Elma Co., Ltd., holding at a temperature rising rate of 10 ° C./min, holding at 250 ° C. for 5 minutes, and at a cooling rate of 10 ° C./min to 20 ° C. The temperature at which the endothermic peak starts on the DSC curve when the temperature was lowered and the temperature was raised again to 280 ° C. at a rate of temperature rise of 10 ° C./min was defined as the crystal melting start temperature.
[0037]
(Example1)
  Melting point 140 ° C., glass transition temperature 59 ° C., optical purity 95%, melt flow rate 18 g / 10 min, crystallization temperature 132 ° C. poly L-lactic acid as sheath component, melting point 172 ° C., glass transition temperature 60 ° C., optical The master chip composition in which 10% by weight of talc having an average particle diameter of 1 μm is added to poly L-lactic acid having a purity of 99%, a melt flow rate value of 25 g / 10 min, and a crystallization temperature of 136 ° C. is a uniaxial extension Using a compound spinning apparatus equipped with two ruder type melt extruders, spinning temperature is 210 ° C., single hole discharge rate is 1.0 g / min, core / Melt spinning was performed at a sheath composite ratio (weight ratio) = 1/1, and the undrawn yarn was obtained by winding at a spinning speed of 1100 m / min while cooling with an air cooling device and applying an oil agent. The obtained undrawn yarn was rewound to form a 220,000 dTex undrawn yarn tow. Next, the undrawn yarn tow was drawn using a generally used multi-stage heat drawing apparatus capable of two-stage drawing. In stretching, the first roller temperature is 65 ° C., the second roller temperature is 95 ° C., the bath temperature is 80 ° C., the total draw ratio is 2.3, the fineness is 2.0 dTex, and the average fiber length is 37 mm. Fiber was obtained.
  On the other hand, solvent-spun cellulose fiber “Lyocell” (manufactured by Lenzing) is used as a regenerated fiber, and a short fiber having a fineness of 1.5 dTex and an average fiber length of 40 mm is prepared, and the regenerated fiber component / polylactic acid component mixing ratio (weight ratio) is 92. / 8 blended using a blended cotton machine, and the resulting blended cotton was opened with a roller card machine to form a web, and a roving was obtained through kneading and roving.
  The resulting roving was given a draft of 23 times, an air jet swirling nozzle was used for the false twisted body, nozzle air pressure 4.4 kg, yarn speed 80 m / min, heater temperature 147 ° C. (non-contact) The fusion false twist was taken up into a package. The obtained biodegradable false-twisted spun yarn of the present invention was 60th, and when the cross section and the side surface were observed with an optical microscope, only the sheath component of the binder fiber was melted and the fiber form of the core portion was maintained.
[0038]
(Example2)
  A polylactic acid stereocomplex having a crystal melting start temperature of 206 ° C. and a melting point of 218 ° C. prepared by mixing poly-L- and poly-D-lactic acid with an optical purity of 99% in an equivalent amount in the core, and in the sheathMelting point: 21 ° C., melting point 170 ° C., glass transition point 66 ° C., heat of fusion 42 J / g, optical purity 99% (determined mainly by L-form: L, D-form charge ratio during lactic acid monomer polymerization) / 10 minutesUsing polylactic acid, melt spinning with core / sheath composite ratio (melting volume ratio) = 1/1, spinning temperature 240 ° C., spinning speed 900 m / min. An undrawn yarn was obtained. Next, the undrawn yarn was drawn at a temperature of 60 ° C. and a magnification of 4.15 and then cut to obtain a polylactic acid core-sheath binder fiber having a fineness of 1.8 dTex and an average fiber length of 35 mm.
  AndCotton blended using a blended cotton machine, the resulting blended cotton was opened using a roller card machine to form a web, and a polylactic acid sliver was obtained through a drawing process.
On the other hand, a cotton comb sliver is prepared through a known spinning process, and the sliver (polylactic acid binder fiber) forming the core is supplied to the outside as viewed from the fryer head in the roving machine, and the wound sliver (cotton combed yarn) is flyer. A double layer roving was spun from the inside as viewed from the head. The mass ratio of cotton comb sliver to polylactic acid sliver is 85:15.
Next, a 20 times draft was given to the double layer coarse yarn, an air jet swirl nozzle was used for the false twisted twisted body, nozzle air pressure 4.0 Kg, yarn speed 80 m / min, heater temperature 160 ° C. (non-contact) Fused false twisted under the conditions of
  like thisThus, a 60th biodegradable false twist spun yarn was obtained.
[0039]
(Example3)
  Example2No. 60 No. biodegradable false twisted spun yarn was used as a background, and a mock-up woven fabric was prepared with a rapier loom. After a reduction cleaning at 70 ° C. for 20 minutes, the cotton component was dyed with a reactive dye at 55 ° C. for 60 minutes to obtain a woven or knitted fabric.
  The obtained woven or knitted fabric was excellent in natural feeling and soft feeling in addition to refreshing feeling and dry feeling, and was synergistic with breathability of imitation weaving, and was optimal for summer clothes. In addition, it was a woven or knitted fabric that was excellent in preventing pilling and that did not tingle and had a good finish.
[0040]
(Example4)
  Example1No. 60 biodegradable false twisted spun yarn was used as warp and side-by-side latent crimped polylactic acid filament 110dTex24f was used as weft to produce a French twill fabric.3A woven or knitted fabric was obtained by performing the same dyeing process.
  The obtained knitted and knitted fabrics were knitted and knitted fabrics that had not only moderate coolness, dryness, naturalness and softness, but also stretch, resilience and tension.
[0042]
【The invention's effect】
The biodegradable false twisted spun yarn of the present invention is obtained by falsely twisting a fiber bundle obtained by blending a short fiber containing at least one of regenerated fiber or natural fiber and a binder fiber or in the form of a multilayer. Although the binder fibers are biodegradable short fibers, the binder fibers are biodegradable and do not melt all the binder fibers, but maintain the fiber form. The biodegradable false twisted spun yarn has the effect of giving a natural feeling, soft feeling, bulkiness and flexibility.
In particular, the binder fiber is a core-sheath composite short fiber, the core part is made of a biodegradable thermoplastic polymer having a high melting point, and the sheath part is made of a biodegradable thermoplastic polymer having a lower melting point than the polymer. As a mode in which a degradable composite short fiber is desirable and further reflects the above effect, in the core-sheath composite short fiber, a component constituting the core part forms a stereocomplex with a crystal melting start temperature of 180 ° C. or higher. A biodegradable false-twisted spun yarn comprising a polylactic acid-based polymer and having a melting point lower than the melting point of the component constituting the core, and the melting point difference being 30 ° C. or higher. It is done.
[0043]
Furthermore, the woven or knitted fabric using only the biodegradable false twisted yarn of the present invention has an effect of expressing an appropriate refreshing feeling, dry feeling, natural feeling, soft feeling, bulkiness and flexibility, but it is combined with other yarns. By doing so, there is a higher effect. Moreover, if the binder fiber contained in the biodegradable false twisted spun yarn is removed, an effect of obtaining a bulky woven or knitted fabric having a natural feeling and a soft feeling increased from those of the original material can be obtained.
As described above, the biodegradable false twisted spun yarn of the present invention can be listed in various modes according to the use and purpose, and is a novel garment material that is extremely versatile regardless of whether it is thick or thin. And since recycled fibers or natural fibers are fused to each other, it has excellent pilling prevention and has an appropriate bending rigidity, so that it retains its natural feel, does not get ridiculous, and does not lose its shape after washing. Providing clothing materials with good shine.

Claims (4)

And short fibers containing at least either reproduces or natural fibers, a binder fiber mixture ratio 95: 5 to 70: The fiber bundle blended or multi-layer 30 and the false twist formed by, the short fibers are fused to each other The false twisted spun yarn , the binder fiber is made of a biodegradable thermoplastic polymer having a high melting point in the core, and a biodegradable thermoplastic polymer having a melting point lower than that of the polymer, A biodegradable false-twisted spun yarn, wherein the biodegradable thermoplastic polymer is a biodegradable composite short fiber made of an aliphatic polyester-based polymer or an aliphatic polyesteramide-based copolymer. Biodegradable thermoplastic polymer constituting the core portion, crystal melting start temperature is polylactic acid polymer that forms the stereocomplex at 180 ° C. or higher, biodegradable thermoplastic polymer constituting the sheath part 2. The biodegradable false-twisted spun yarn according to claim 1 , wherein the biodegradable false-twisted spun yarn has a melting point lower than the melting point of the polymer constituting the core, and the difference between the melting points of the two polymers is 30 ° C. or more. A woven or knitted fabric comprising the biodegradable false-twisted spun yarn according to claim 1 or 2 as at least a part of its configuration. Bulkiness woven or knitted fabric, characterized in that the woven or knitted fabric Karaba Indah fiber according to claim 3, wherein the dissolved and removed.