JP4517675B2 - Remote area - Google Patents

Description

  The present invention relates to a base made of biodegradable polylactic acid fiber having a low environmental load. More specifically, the present invention relates to a fabric made of a polylactic acid filament having a high hollow ratio, which is superior in terms of biodegradability, lightness and bulkiness, has a high-class feeling, and has significantly improved durability strength, wear resistance, and the like. Is.

  Polylactic acid fiber is a biodegradable fiber that can be obtained from non-petroleum-based raw materials, so it can be naturally decomposed in soil or composted and decomposed. Therefore, it has been attracting attention as a fiber with a small environmental load, and its application development has been widely promoted.

  For example, draining garbage bags, tea bags, sandbag bags, seedling mats, and the like have been put into practical use as applications in which the biodegradability of polylactic acid fibers can be utilized as they are. However, the majority of other uses, especially material uses, can utilize the low environmental impact as a merit for disposal after product use, but the functions of existing material fibers during product use, For example, initial characteristics such as strength, toughness, elastic modulus, and heat resistance, and durability characteristics such as wear resistance, sag resistance, and fatigue resistance are required to be comparable. Therefore, in the development of materials for polylactic acid fibers, the main focus has been on improving the areas where the physical properties of polylactic acid fibers are inferior compared to existing fibers. As for polylactic acid fibers, most of the functions other than biodegradability do not reach the level of existing fibers, and as a result, development of applications has not progressed.

  Therefore, the present inventors rather attempted to develop a new product utilizing characteristics other than biodegradability of polylactic acid fiber. In other words, by developing new spinning technology that fully exploits the characteristics and potential of polylactic acid polymer, we have been working on developing high-performance polylactic acid fiber products that could not be achieved with existing fibers.

  In the production of polylactic acid fibers, the polymer has a high molecular weight, and therefore the polymer as spun has a high melt viscosity and a high glass transition temperature for a relatively low melting point. For example, it is known that when atypical cross-section fibers are produced using a polylactic acid polymer, fibers with a high degree of deformation are obtained. However, atypical cross-section fibers that have a degree of deformation that is too high compared to existing fibers have disadvantages such as rough texture and poor wear resistance and sag resistance. Improvement was being promoted.

  However, the present inventors have developed a yarn production technique for obtaining a hollow polylactic acid fiber having a high hollow ratio, which has not been conventionally used, by taking advantage of the characteristics of the polylactic acid polymer, which makes it easy to obtain a highly deformed modified cross-section fiber. And if necessary, it is made into a crimped yarn to make use of the lightness and bulkiness of the hollow polylactic acid fiber, and by using the hollow polylactic acid fiber as a kneaded fabric, it has a light weight and bulkiness that did not exist conventionally This led to a high-quality remote area with excellent properties.

  Regarding the base made of the polylactic acid fiber of the present invention, there are Patent Documents 1 to 4 as conventional techniques.

  Patent Document 1 discloses “Polyester padded cotton having a soft texture while having good physical properties and having biodegradability”, but the texture is adapted to the use of the padded cotton. It is a thing and is not suitable as a remote place.

  Patent Document 2 states that “an aliphatic polyester yarn excellent in bulkiness and wear durability and capable of providing a carpet that can be reduced in weight by a good covering property, and using this aliphatic polyester yarn as a face yarn. The invention described in the patent document relates to an aliphatic polyester yarn limited to carpet use, and its hollowness is substantially at most 9% (Example 2). And Example 3: Y type hollow) and 10% (Example 1: Y type hollow, Example 4: rice field hollow) are only obtained. The present invention relates to a fabric made of polylactic acid multifilament, and further relates to a fabric made of polylactic acid multifilament having a higher hollow ratio than the patent document technology, which is completely different.

  Patent Document 3 discloses a long fiber having biodegradability, excellent spinning yarn cooling and mechanical performance, and thermal adhesiveness. The long fiber in the present invention is substantially polybutylene succinate and is common to the present invention in terms of biodegradability, but it is a technology related to a material having a different polymer structure, and is not suitable for a remote area. Absent.

Patent Document 4 states that “a recyclable fabric with permanent flexibility and waterproofness that is difficult to get dirty and a cocoon using the same” and “at least one side of a base fabric made of polyester fiber” However, since the invention described in the patent document relates to a textile using hollow fibers made of polyethylene terephthalate, it has biodegradability. Not only did it not be bulky, but also lacked bulkiness and luxury.
JP 2000-234252 A JP 2002-227036 A JP-A-8-158154 JP 2000-17578 A

  The present invention is a fabric made of biodegradable polylactic acid fibers with a low environmental load, especially made of polylactic acid filaments with a high hollow ratio, and has a high-class feeling with excellent biodegradability, light weight and bulkiness. In addition, it is an object of the present invention to provide a dredged material with significantly improved durability, strength, wear resistance, and the like.

The object of the present invention can be achieved by the following means.
(1) have a hollow ratio of 11 to 70%, strength is characterized by comprising a polylactic acid multifilament is 4.2~9cN / dtex bag locations.
(2) a hollow portion of the polylactic acid multifilament, bag locations, according to the 1, characterized in that one formed in a melt spinning process.
(3) the polylactic acid multifilament is characterized in that the crimped yarn or dyed yarn (1) or bag locations, according to (2).
(4) a polylactic acid multifilament fatty bisamide and / or alkyl-substituted fatty acid monoamide, any above, wherein the containing 0.1-5 wt% based on the total filaments (1) to (3) The remote area according to item 1.
( 5 ) The kneaded fabric according to any one of (1) to (4) above, wherein the polylactic acid multifilament has a single fiber fineness of 1 to 25 dtex and a total fineness of 15 to 2500 dtex.
( 6 ) The woven or knitted fabric having a basis weight of 100 to 2000 g / m ² and an apparent density of 0.4 to 1.0 g / cm ³ , described in any one of (1) to ( 5 ) above Remote area.
( 7 ) A bag made using the paddy field according to any one of (1) to ( 6 ).

  According to the present invention, it is a fabric made of biodegradable polylactic acid fibers with a low environmental load, particularly made of polylactic acid filaments with a high hollow ratio, and is superior in terms of biodegradability, lightness and bulkiness, and high quality. In addition, it is possible to obtain a fabric that has significantly improved durability, strength, wear resistance, and the like.

  The present invention is especially suitable for carry bags, travel bags, women's bags, small bags, Boston bags, student bags, handbags, shoulder bags, suitcases, rucksacks, knapsacks, etc. It can be used suitably for moss.

  Hereinafter, the present invention will be described in detail.

  The polylactic acid filament used for the base of the present invention is made of a polylactic acid polymer. In the present invention, the polylactic acid polymer refers to a polymer obtained by polymerizing lactic acid oligomers such as lactic acid and lactide, and the L-form ratio or D-form ratio of lactic acid in the polymer is preferably 95% or more because the melting point is high. The L-form ratio or the D-form ratio is more preferably 98.5% or more. A blend of polylactic acid having an L-form ratio of 95% or more and polylactic acid having a D-form ratio of 95% or more in a ratio of 70/30 to 30/70 is preferable because the melting point is further improved. When the molecular weight of the polylactic acid polymer is 50,000 to 500,000 in terms of weight average molecular weight, it is preferable that the balance between mechanical properties and moldability is good. In addition, components other than lactic acid may be copolymerized as long as the properties of polylactic acid are not impaired. Polymers and particles other than polylactic acid, matting agents, plasticizers, flame retardants, antistatic agents, Additives such as odorants, antibacterial agents, antioxidants, heat resistance agents, light resistance agents, ultraviolet absorbers, and coloring pigments may be included as necessary. As a polymer other than polylactic acid, for example, an aliphatic polyester polymer such as polycaprolactone, polybutylene succinate, and polyethylene succinate can be used as a plasticizer.

  However, the polylactic acid filament used in the remote area of the present invention takes advantage of the characteristics of being biodegradable and non-petroleum-based raw material, and is used as a product with a small environmental impact even when discarded. It is more preferable to avoid copolymerization of the components as much as possible, and it is more preferable that various additives are not any heavy metal compound or environmental hormone substance, or any compound that is currently expected to be concerned.

Polylactic acid filament to be used in the bag fabric of the invention, Ru hollow filaments der hollow ratio of the cross-section of the filaments have a high hollow rate of 11 to 70%. The hollow ratio is preferably 21 to 60%, more preferably 31 to 50%. The hollow ratio is the ratio of the area occupied by the hollow portion in the cross section of the fiber filament. If it is less than 11%, the characteristics such as lightness and bulkiness of the present invention are not sufficiently obtained without much difference from conventional polylactic acid fibers. A hollow ratio exceeding 70% is difficult to obtain by a normal melt spinning method. Even if it can be obtained, the hollowness is crushed when the product is used. The characteristics of can not be obtained.

  The hollow part of the polylactic acid filament used for the anchor of the present invention has at least one hollow part in the cross section of the filament. When the number of the hollow portions is one, a high hollow ratio can be easily obtained. When the number of the hollow portions is two or more, the hollow portion is not easily crushed. Therefore, it is necessary to select according to the application. A hollow section having a hollow portion of 2 to 4 has a good balance between the high hollow ratio and the difficulty of being crushed, and three hollow section yarns are particularly preferable. In addition to the round shape, the outer shape of the fiber cross section may be a trilobal shape, a multi-leaf shape of a square shape or more, and other irregular shapes.

  The hollow polylactic acid filament in the present invention is preferably one in which a hollow portion is formed by a melt spinning process. In the melt spinning process, the hollow part is formed by spinning the melted polymer from the slits perforated in each filament of the melt spinning nozzle, spinning the melted polymer, and cooling and solidifying the polymer. This is done by melt bonding. This melt bonding method is an efficient method and can be manufactured at a low cost, and thus is generally employed as a method for manufacturing a hollow filament. According to this method, various cross-sectional shapes of the hollow polylactic acid fragment in the present invention can be obtained.

  As another method, there is a method in which a core-sheath composite fiber is produced using a soluble polymer in the core part and a polylactic acid polymer in the sheath part, and the core part of the composite fiber is dissolved and removed with a solvent. Although this method is easy to obtain a high hollow ratio as compared with the above method, there is a disadvantage that the production cost is high because the selection of the core polymer and the solvent and the step of dissolving the core polymer are required.

Hollow polylactic acid filament in the present invention, Ru multi-filament der from the luxury of when the bag area. However, when the hollow polylactic acid filament is further processed into a crimped yarn and used, it is possible to obtain a high-grade fabric that is lighter and more bulky. The crimped yarn can be produced by crimping as represented by a normal false twisting method, a stuffing method, an air jet method, and the like, and a processing method can be selected according to the use of the kneaded material. When the false twisting method or the stuffing method is used, stretchable and bulky can be obtained, and when the air jet method is used, a bulky and non-stretched crimped yarn can be obtained. Although some hollow parts may be crushed during crimping, it is the most effective for weight reduction when considering the increase in bulkiness due to the occurrence of crimping and the decrease in hollowness due to crushing of the hollow part. It is preferable to select various conditions.

  Moreover, it is preferable to use the polylactic acid multifilament used for the fabric of the present invention as an original yarn. In general, it is known that polylactic acid fibers are hydrolyzed at the time of dyeing, the molecular weight of the polymer is lowered, and the strength is lowered. Therefore, in order to avoid this, it is preferable to obtain an original polylactic acid multifilament to which the dyeing process is not applied and use it as the base of the present invention.

  The colorant used for the original polylactic acid filament according to the present invention is a specific inorganic, organic pigment or dye suitable for the polylactic acid fiber. Specifically, oxide-based inorganic pigments excluding lead, chromium and cadmium, ferrocyanide inorganic pigments, silicate inorganic pigments, carbonate inorganic pigments, phosphate inorganic pigments, carbon black, aluminum powder, bronze powder and titanium powder Selected from inorganic pigments such as coated mica, organic pigments such as phthalocyanine organic pigments, perylene organic pigments, isointoserinone organic pigments, and heterocyclic dyes, helinone dyes, perylene dyes and thioindio dyes 2 or more types are combined. For example, inorganic pigments include oxides such as titanium oxide, zinc white, titanium yellow, zinc-iron-based brown, titanium-cobalt green, cobalt green, cobalt blue, copper-iron black, and ferrocyans such as bitumen. , Silicates such as county blue, carbonates such as calcium carbonate, phosphates such as manganese violet, carbon black, aluminum powder and bronze powder, and titanium powder-coated mica are used, lead, chromium and cadmium Inorganic pigments containing heavy metals such as are not used. As the organic pigment, phthalocyanine series such as copper phthalocyanine blue, copper phthalocyanine green and brominated copper phthalocyanine green, perylene series such as perylene scarlet, perylene la, perylene maroon, isoindolinone, etc. are used. Examples of the dye include anthraquinone series such as Solvent R.50, Solvent R.111, Solvent B.94, Solvent V.50, Solvent G.3, and heterocyclic systems such as Solvent Y.33 and Solvent Y. .111, Solvent Y.54, Helinone series such as Solvent O.60, Solvent R.135, Solvent R.179, perylene series such as Solvent G.5, thioindio series such as Vat R.1 are used.

  The colorant used for the original polylactic acid filament in the present invention is one or a combination of two or more selected from the above inorganic pigments, organic pigments and dyes.

  The concentration of the colorant added is 100 to 30,000 ppm, preferably 500 to 10,000 ppm, per polymer weight. The colorant can also be used in combination with a commonly used dispersant.

  Next, the polylactic acid filament used for the base of the present invention preferably contains 0.1 to 5% by weight of fatty acid bisamide and / or alkyl-substituted fatty acid monoamide based on the whole fiber. Polylactic acid filaments containing fatty acid bisamides and / or alkyl-substituted fatty acid monoamides have the above-mentioned unprecedented high hollowness and strength, and are excellent in durability such as wear resistance and bending fatigue resistance Can be added. Furthermore, the surface of the fiber has a moist touch, and there are also features such as a clear and deep color tone.

  The fatty acid bisamide in the present invention refers to a compound having two amide bonds in one molecule such as saturated fatty acid bisamide, unsaturated fatty acid bisamide, aromatic bisamide, etc., for example, methylene biscaprylic acid amide, methylene biscapric acid amide. , Methylene bis lauric acid amide, methylene bis myristic acid amide, methylene bis palmitic acid amide, methylene bis stearic acid amide, methylene bis isostearic acid amide, methylene bis behenic acid amide, methylene bis oleic acid amide, methylene bis erucic acid amide , Ethylene biscaprylic amide, ethylene biscapric amide, ethylene bislauric acid amide, ethylene bismyristic acid amide, ethylene bispalmitic acid amide, ethylene bisstearic acid amide, ethylene bis Sostearic acid amide, ethylene bis behenic acid amide, ethylene bis oleic acid amide, ethylene bis erucic acid amide, butylene bis stearic acid amide, butylene bis behenic acid amide, butylene bis oleic acid amide, butylene bis erucic acid amide , Hexamethylene bis stearic acid amide, hexamethylene bis behenic acid amide, hexamethylene bis oleic acid amide, hexamethylene bis erucic acid amide, m-xylylene bis stearic acid amide, m-xylylene bis-12-hydroxy stearic acid amide P-xylylene bis-stearic acid amide, p-phenylene bis-stearic acid amide, p-phenylene bis-stearic acid amide, N, N′-distearyl adipic acid amide, N, N′-distearyl sebacic acid amide, N N'-dioleyl adipic acid amide, N, N'-dioleyl sebacic acid amide, N, N'-distearyl isophthalic acid amide, N, N'-distearyl terephthalic acid amide, methylenebishydroxystearic acid amide, ethylene Examples thereof include bishydroxystearic acid amide, butylene bishydroxystearic acid amide, and hexamethylene bishydroxystearic acid amide.

  The alkyl-substituted fatty acid monoamide referred to in the present invention refers to a compound having a structure in which an amide hydrogen such as a saturated fatty acid monoamide or an unsaturated fatty acid monoamide is replaced with an alkyl group, such as N-lauryl lauric acid amide, N- Palmityl palmitic acid amide, N-stearyl stearic acid amide, N-behenyl behenic acid amide, N-oleyl oleic acid amide, N-stearyl oleic acid amide, N-oleyl stearic acid amide, N-stearyl erucic acid amide, N-oleyl And palmitic acid amide. The alkyl group may have a substituent such as a hydroxyl group introduced into its structure. For example, methylol stearamide, methylol behenic acid amide, N-stearyl-12-hydroxystearic acid amide, N- Oleyl 12 hydroxystearic acid amide and the like are also included in the alkyl-substituted fatty acid monoamide of the present invention.

  Fatty acid bisamides and alkyl-substituted fatty acid monoamides are preferably used in the present invention, but these compounds have a lower amide reactivity than ordinary fatty acid monoamides, and are reactive with polylactic acid during melt molding. Hard to happen. In addition, since many of them have a high molecular weight, they generally have good heat resistance and are difficult to sublimate. In particular, fatty acid bisamides can be more preferably used because they are less reactive with polylactic acid due to the lower reactivity of amides, and are high in heat resistance and difficult to sublime due to their high molecular weight.

  The polylactic acid filament used for the base of the present invention contains 0.1 to 5% by weight, preferably 0.5 to 3% by weight, of fatty acid bisamide and / or alkyl-substituted fatty acid monoamide based on the whole fiber. If it is less than 0.1% by weight, durability such as wear resistance and bending fatigue resistance cannot be sufficiently obtained. On the other hand, if it exceeds 5% by weight, the strength of the polylactic acid multifilament is lowered, and the yarn making process Since thread breakage occurs frequently and the production yield decreases, it is not preferable.

  The fatty acid amide may be added alone, or a plurality of components may be mixed and used. Even when mixed and used, the entire mixture may be contained in an amount of 0.1 to 5% by weight.

The polylactic acid multifilament preferably used for the fabric of the present invention has a strength of 4.2 to 9 cN / dtex, preferably 4.2 to 8 cN / dtex, more preferably 5 to 8 cN / dtex. If it is less than 3 cN / dtex, the strength as a remote area may be insufficient. On the other hand, the higher the strength, the better, but it is difficult at present to produce industrially those exceeding 9 cN / dtex.

  The polylactic acid multifilament preferably used in the kneaded fabric of the present invention preferably has a single fiber fineness of 1 to 25 dtex. In the polylactic acid multifilament preferably used for the kneaded fabric of the present invention, if the single fiber fineness is less than 1 dtex, the abrasion resistance may not be sufficient, or the firmness and waist of the knot may not be sufficient. On the other hand, when the single fiber fineness exceeds 25 dtex, the surface of the kneaded material becomes rough and a high-grade feeling may not be obtained sufficiently.

  The total fineness is preferably 15 to 2500 dtex. If it is less than 15 dtex, the thickness as a base is not sufficient and the strength is insufficient. On the other hand, when it exceeds 2500 dtex, it becomes a thick anchorage and it is difficult to use it as a normal anchorage.

Bag land consisting of a polylactic acid filament of the present invention, ing from woven or knitted fabric, especially of woven or knitted fabric base fabric multi-filament. By using a woven or knitted fabric, the fabric of the present invention satisfying the lightness, bulkiness, luxury, mechanical strength, durability and the like can be obtained. When the base fabric is made of a non-woven fabric other than the woven or knitted fabric, for example, although the lightness and bulkiness are satisfied, it may be slightly inferior to a high-grade feeling and may have insufficient strength and wear resistance. is there.

The base made of the polylactic acid filament of the present invention preferably has a basis weight of 100 to 2000 g / m ² in order to satisfy the most important characteristic, lightness. Preferably, it is 150-1000 g / m < ² >, More preferably, it is 200-450 g / m < ² >. If it is 100 g / m ² or more, the bulkiness is good, it has a high-quality feeling, and the strength and durability as a base are sufficiently obtained. On the other hand, if it is 2000 g / m < ² >, it will become a remote place utilizing the lightness.

The high-quality feeling brought about by the lightness and bulkiness, which is a characteristic of the base made of the polylactic acid filament of the present invention, has a low density of 0.4 to 1.0 g / cm ^3. Characterized by. Preferably, it is 0.5 to 0.8 g / cm ³ . The lower the apparent density is, the lighter and better the bulkiness can be obtained, but at the same time the strength and durability are lowered. Therefore, in the present invention, the basis weight is 0.4 or more so that the bulkiness, strength, durability, etc. There can be enough remote areas. On the other hand, when the apparent density is 1.0 g / cm ³ or less, it is possible to make the remarkably lighter than the conventional reed. In order to set the apparent density of the kneaded material to 0.4 to 1.0 g / cm ³ , it is preferable to use a hollow polylactic acid fiber having lightness and bulkiness, particularly a hollow polylactic acid crimped yarn. That is, in the present invention, when a hollow polylactic acid fiber having a hollow ratio of 11 to 70% is used, the apparent density is 0.38 to 1 with respect to a solid polylactic acid fiber (density 1.27 g / cm ³ ). .13 g / cm ³ and lightweight. Furthermore, if the hollow ratio is 31%, the apparent density is 0.88 g / cm ³ , and it is lighter than the polypropylene fiber, which is the lightest fiber made of general-purpose resin, as well as floating in water. Moreover, since the apparent volume is 1.12 to 3.33 times, the bulkiness can be increased.

  Further, when hollow polylactic acid crimped yarn is used in the present invention, bulkiness due to crimping is added, and when it is made into a knitted fabric, it becomes more bulky. The ground is obtained.

  In addition to the above light weight and bulkiness, the polylactic acid multifilament according to the present invention has a high-quality feeling because the polylactic acid multifilament according to the present invention has a high-class feeling. The fatty acid bisamide and / or alkyl-substituted fatty acid It is thought that by containing monoamide, a deep pearly luster and moist texture can be obtained.

  The bag made of the polylactic acid multifilament of the present invention is a carry bag, a travel bag, a bag for women, a bag for small items, a Boston bag, a student bag, a hand bag, a shoulder bag, a suit that is particularly excellent in lightness and bulkiness. It can be suitably used for cases such as cases, rucksacks and knapsacks.

  Next, a method for producing the polylactic acid filament for the present invention will be described in detail by taking a multifilament as an example.

  The polylactic acid multifilament in the present invention is produced by a melt spinning method. In particular, in the case of a hollow polylactic acid multifilament, in the melt spinning step, 0 to 15 cm is set as the upper end from the spinneret surface, and from the upper end. It is preferable to expose the spun yarn to a high temperature atmosphere of 160 to 280 ° C. by surrounding the range of 5 to 100 cm with a heating tube and / or a heat insulating tube.

  An example of a typical direct spinning drawing apparatus is shown in FIG. 1 in order to describe the production process of the polylactic acid multifilament in detail.

  First, the polylactic acid polymer used as a raw material for the polylactic acid multifilament in the present invention can be synthesized using a known method, but the color tone of the polylactic acid itself is good and the remaining oligomers and monomers such as lactide are reduced. It is preferable. As a specific method, for example, as described in JP-A-7-504939, it is preferable to use a metal deactivator, an antioxidant, or the like, to lower the polymerization temperature, and to suppress the catalyst addition rate. Moreover, the amount of residual oligomers and monomers can be significantly reduced by subjecting the polymer to reduced pressure treatment or extraction with chloroform or the like.

  The polylactic acid used in the production of the polylactic acid multifilament in the present invention uses a high viscosity polymer having a relative viscosity of preferably 2.5 to 5, more preferably 3.5 to 4.5. When a polymer having a relative viscosity of less than 2.5 is used, the polylactic acid multifilament having high strength and excellent wear resistance of the present invention may not be obtained stably. On the other hand, when a high-viscosity polymer having a relative viscosity of more than 5 is used, stable yarn production is difficult, and polylactic acid multifilaments with excellent uniformity may not be obtained. Since the polylactic acid polymer is subjected to melt spinning with a water content of 0.1% by weight or less in the polymer, it is usually dried at 80 to 130 ° C. for 5 hours or more to remove the water.

  The method of incorporating the fatty acid bisamide and / or the alkyl-substituted fatty acid monoamide and / or the coloring agent for the original yarn into the polylactic acid multifilament in the present invention is not particularly limited, but for example, the following method can be adopted. . First, as a kneading step, after drying polylactic acid, fatty acid bisamide and / or alkyl-substituted fatty acid monoamide, and / or coloring agent for the original yarn, it is supplied to a nitrogen-sealed kneading extruder to produce a kneading chip. To do. Next, melt spinning is performed by subjecting the kneading tip to an extruder. In the kneading step, a kneading chip containing a high ratio of fatty acid bisamide and / or alkyl-substituted fatty acid monoamide and / or coloring agent for the original yarn is prepared (master chip formation), and this is used in a spinning machine. A method of blending and diluting ordinary polylactic acid chips so that the fatty acid bisamide and / or the alkyl-substituted fatty acid monoamide and / or the coloring agent for the original yarn can have a desired content can be used. In the melt spinning step, it is possible to further finely knead the polylactic acid, the fatty acid amide, and the coloring agent for the original yarn by installing a static kneader between the extruder and the pack or in the pack. Aggregation of the fatty acid amide and the coloring agent for the original yarn, and bleeding out to the fiber surface may cause deterioration of operability due to dirt on the guides and rollers, and may cause physical properties and dyeing spots on the fiber product. In the melt spinning step, it is preferable to finely disperse the fatty acid amide and the coloring agent for the original yarn in polylactic acid.

  Further, kneading and melt spinning may be performed in the same process, and for example, the following method can be used. In the first method, polylactic acid, fatty acid bisamide and / or alkyl-substituted fatty acid monoamide, and / or coloring agent for the original yarn are dried, then supplied to an extruder sealed with nitrogen, and kneaded by the extruder. Method of kneading polymer melt of polylactic acid, fatty acid bisamide and / or alkyl-substituted fatty acid monoamide, and / or coloring agent for original yarn, finely kneaded with a static kneader, discharged from discharge holes, and melt spinning It is. In the second method, polylactic acid and fatty acid bisamide and / or alkyl-substituted fatty acid monoamide and / or coloring agent for original yarn are separately melted, and the melt is finely kneaded with a static kneader, It is a method of discharging from a discharge hole and melt spinning.

  The fatty acid bisamide and / or the alkyl-substituted fatty acid monoamide is preferably contained in an amount of 0.1 to 5% by weight based on the total amount of the blend polymer. If the content of the fatty acid amide is less than 0.1% by weight, the surface friction coefficient of the fiber cannot be reduced, and it becomes difficult to improve the process passability in the weaving or knitting process. If the content of the fatty acid amide exceeds 5% by weight, excessive fatty acid amide bleeds out from the molten polymer during kneading or spinning, which deteriorates the working environment, causing sublimation or decomposition to cause fuming, Further, it becomes impossible to prevent a decrease in operability such as contamination of the extrusion kneader or melt spinning machine due to excessive sublimates or decomposition products of fatty acid amides. If the content of the fatty acid amide exceeds 5% by weight, bleeding out of the molten polymer of the fatty acid amide from the molten polymer is not suppressed in the spinning process, thereby making the discharge of the polymer from the discharge holes unstable and uniform. It becomes difficult to obtain fibers with special physical properties. The content of the fatty acid amide is preferably 0.5 to 3% by weight. In the present invention, fatty acid bisamides and / or alkyl-substituted fatty acid monoamides are used. However, these are preferable lubricants because they are less likely to sublimate and have better heat resistance than prior art fatty acid monoamides. In particular, fatty acid bisamides can be preferably used because they are less reactive with polylactic acid because of the lower reactivity of amides, and are high in heat resistance and difficult to sublimate because of their high molecular weight.

  Further, the coloring agent for the original yarn is preferably contained in an amount of 100 to 30,000 ppm, more preferably 500 to 10,000 ppm, based on the total amount of the blend polymer. By setting the content of the coloring agent for the original yarn to 100 ppm or more, it is possible to produce fibers that are free from spots and colored in a desired color. Moreover, by making it 30000 ppm or less, process instability due to melt spinning / drawing caused by aggregation of the colorant or yarn breakage in the weaving or knitting process can be avoided. Further, in order to suppress aggregation of the colorant, the colorant can be used in combination with a commonly used dispersant.

  In producing the polylactic acid multifilament in the present invention by melt spinning and stretching, the spinning temperature is 190 to 260 ° C, preferably 200 to 240 ° C.

  The hollow polylactic acid multifilament die can be achieved, for example, by using a die having a die hole shown in FIG. 2 in the case of a round single hollow section yarn. In this case, from the viewpoint of high hollowness, the slit width / slit diameter ratio is preferably small, preferably 0.05 to 0.40, more preferably 0.05 to 0.25. If the ratio of slit width / slit diameter is less than 0.05, the hollow ratio becomes too high, and the hollow may be crushed in the stretching process, weaving process, and knitting process. On the other hand, if it exceeds 0.40, a sufficient hollow ratio is not obtained, and the effect of the present invention cannot be obtained. The slit width is preferably 0.1 to 0.6 mm, more preferably 0.2 to 0.5 mm, and the slit diameter is preferably 0.5 to 4.0 mm, more preferably 1.0 to 3.0 mm. It ’s fine. Furthermore, as described above, polylactic acid has a high degree of deformation due to its polymer temperament, so that the polymer discharged from the slit tends to keep its shape as it is with little thermal relaxation. For this reason, when the number of slits is 2 or 3, it is difficult to obtain a round hollow and a high hollow ratio may not be achieved. Therefore, the preferred number of slits is 4 or more, or 1 (C-shaped hole). When the number of slits is 10 or more, the die design becomes complicated, which is not practical from an industrial viewpoint.

  The shape of the die hole is not limited to that shown in FIG. 2, and the desired hollowness can be obtained in consideration of the melt viscosity of the polylactic acid polymer, the spinning temperature, the slow cooling conditions under the die and the cooling and solidifying conditions. What is designed may be used. For example, in the case of a Y-type hollow cross-sectional yarn and a rice-type hollow cross-sectional yarn, the base design as shown in FIGS.

  In the method for producing a hollow polylactic acid multifilament in the present invention, the upper end is set to 0 to 15 cm from the spinneret surface, and the range of 5 to 100 cm from the upper end is surrounded by a heating tube and / or a heat insulating tube, thereby producing a spun yarn. Is preferably used in a high temperature atmosphere of 160 to 280 ° C. The inventors consider that the process is indispensable for producing a polylactic acid multifilament having both high strength and high hollowness from the following viewpoints.

  In general, when producing a hollow fiber by melt spinning, when a crystalline polymer is used, the hollow yarn spun from the spinneret hole gradually fills the hollow portion by thermal relaxation of the molecular chain. It is known that. Therefore, in order to obtain a high hollow ratio, it is necessary to immediately cool and solidify by blowing cold air. However, when the spun yarn is rapidly cooled, the region from the melted state to solidification becomes narrow and the spinning tension is applied in the narrow region, so that the thinning deformation of the yarn occurs abruptly. As a result, molecular chains are highly oriented, and only unstretched yarns with advanced orientation and crystallization can be obtained. In the case of such an undrawn yarn, high-strength drawing cannot be performed, and a highly oriented and high-strength drawn yarn cannot be obtained. In addition, the rapid cooling directly under the base also causes non-uniform cooling, which also makes it difficult to increase the strength by stretching at a high magnification. Therefore, a polylactic acid multifilament having both a high hollow ratio and a high strength cannot be obtained at all by an ordinary method for producing polylactic acid. However, the hollow polylactic acid multifilament in the present invention maintains a high temperature atmosphere directly under the spinneret as described above, and the yarn is gradually cooled by passing through the spun yarn. Does not occur, and an undrawn yarn with low orientation is obtained. As a result, high-strength fiber can be obtained. The polylactic acid multifilament of the present invention is characterized in that a sufficient hollow ratio can be maintained even if a slow cooling zone is provided immediately below the die and the cooling is gradually performed. The polylactic acid polymer has a relatively high degree of polymerization, a high melt viscosity at the spinning temperature of the present invention, a relatively large difference between the spinning temperature and the melting point (about 20 to 90 ° C.), and a low melting point. Nevertheless, it is considered to be achieved by setting the spinning conditions taking advantage of the characteristics of the polylactic acid polymer such that the glass transition temperature is relatively high and the fiber structure is relatively easily fixed.

  Since hollow polylactic acid multifilaments are very lightweight, they are more susceptible to outside air in the spinning process than ordinary polylactic acid multifilaments that are not hollow. Running performance is unstable. As a result, yarn swaying or yarn breakage may occur, resulting in physical property spots on the obtained fiber or poor operability. However, in order to maintain the running stability of the spun yarn, the spun yarn is cooled not from one direction but uniformly from the entire periphery, and from the viewpoint of cooling with the cooling air at the optimized temperature and speed. The spinning yarn is preferably cooled and solidified by blowing cooling air of 10 to 50 ° C. at an air speed of 10 to 50 m / min with an annular type air cooling device.

  The unstretched filament that has been cooled and solidified is then applied with an oil agent. The oil agent contains a smoothing agent as a main component and includes a surfactant, an antistatic agent, an extreme pressure agent component, and the like, but it is necessary to have an oil agent composition excluding components active on polylactic acid fibers. A preferred oil agent composition is, for example, a non-aqueous oil agent obtained by diluting an alkyl ether ester as a smoothing agent, an alkylene oxide adduct of a higher alcohol as a surfactant, and an organic phosphate salt as an extreme pressure agent with mineral oil.

  The unstretched filament yarn provided with the oil is wound around a take-up roll (1FR) and taken up. The speed of the take-up roll, that is, the spinning speed is preferably 300 to 3000 m / min. Although the physical properties of the polylactic acid multifilament of the present invention can be obtained even at a spinning speed of less than 300 m / min, it is difficult to employ industrially because the production efficiency is low. On the other hand, when the spinning speed exceeds 3000 m / min, the high-strength polylactic acid multifilament in the present invention cannot be stably obtained.

  The undrawn yarn taken up at the spinning speed is drawn continuously without being wound once. As with the take-up roll (1FR), a Nelson roll having two rolls as one unit is a yarn feeding roll (2FR), a first draw roll (1DR), a second draw roll (2DR), and a third draw roll. (3DR) and the relaxation roll (RR) are arranged side by side, and the yarn is sequentially wound to perform a drawing heat treatment. Usually, between 1FR and 2FR, the stretch is preferably 0.5 to 10%, and more preferably about 1 to 5%, to converge the yarn. 1FR is preferably heated to 50 to 80 ° C., more preferably 55 to 70 ° C., and the take-up yarn is preheated and sent to the next drawing step. The first stage of stretching is performed between 1DR and 2DR. At this time, the draw point, that is, the necking point, is positioned on the 1DR roll so that it is stably located within a few centimeters immediately before leaving the roll. And the draw ratio of the 1st step is set. However, these conditions need to be changed in consideration of the degree of orientation of the undrawn yarn. Usually, the 2FR temperature is preferably 60 to 120 ° C, more preferably 90 to 110 ° C, the 1DR temperature is preferably 90 to 130 ° C, more preferably 100 to 120 ° C, and the first stage draw ratio is The overall draw ratio is preferably set to 10 to 70%, more preferably 20 to 50%. Within the range of the above conditions, the draw point is set so as to be positioned in the vicinity of the 2FR roll upper exit. Furthermore, in order to set the draw point so as to be positioned at the upper outlet of the 2FR roll, the roll is preferably a satin roll with low friction.

  The second stage stretching is performed between 1DR and 2DR, and 2DR is preferably 110 to 150 ° C, more preferably 115 to 145 ° C. In the case of two-stage stretching, the remaining stretching of the first-stage stretching ratio is performed between the total stretching ratios. In the case of three-stage stretching, the remaining stretching ratio is divided into two stages. The temperature of 3DR in the case of performing three-stage stretching is preferably 120 to 150 ° C, more preferably 125 to 145 ° C. The yarn that has finished the two-stage drawing or the three-stage drawing is preferably subjected to a relaxation treatment of 0.5 to 10%, more preferably 1 to 7% with the RR, and only the distortion caused by the hot drawing is taken. In addition, the highly oriented structure achieved by stretching can be fixed, or the orientation of the amorphous region can be relaxed to reduce the heat shrinkage rate. RR uses an unheated roll or a roll heated to 150 ° C. or lower. Usually, RR becomes a temperature of 90 to 150 ° C. regardless of the presence or absence of heating due to the heat brought in by the yarn heated at the time of hot drawing.

  In the method for producing a polylactic acid multifilament in the present invention, the number of stretching stages is preferably 2 to 5 stages, more preferably 3 to 5 stages. When the number of drawing stages is one, high-strength fibers are difficult to obtain because it cannot be drawn at a high magnification. Further, when the number of stretching stages is 5 or more, it is not preferable because the equipment is enlarged and the manufacturing process becomes complicated. In the present invention, the total draw ratio is preferably 2 to 10 times, although it depends on the spinning speed. If the draw ratio is less than 2 times, the desired strength cannot be obtained, and if it exceeds 10 times, yarn breakage frequently occurs and the process passability deteriorates, which is not preferable.

  When the crimping process is performed, the crimping process may be performed in a separate process or may be performed continuously. When performing continuously, since a high-speed crimping process according to the yarn production speed is necessary, possible processing methods are limited, and a stuffing method is generally employed.

  An example of the stuffing method directly connected to the yarn making process is as follows.

  In the polylactic acid multifilament yarn production process, the yarns that have been heat-stretched are continuously sent to the crimping process and introduced into a heated fluid crimping device to impart crimps. The heated fluid crimping device is a heated fluid ejection nozzle device that jets a heated high-pressure fluid onto the yarn to randomly entangle single yarns to form a three-dimensional loop or a talmi, and further brings the crimped yarn under the heated fluid It comprises a compression heat treatment apparatus for performing compression heat treatment, and a rotary transfer apparatus for ejecting the crimped yarn with heating and cooling the yarn. Superheated steam or heated air is used as the heating fluid. The temperature of the heating fluid is preferably 130 to 200 ° C., and appropriate conditions are selected according to the dryness, pressure, flow rate of the heating fluid, the fineness of the polylactic acid fiber to be processed, the processing speed, and the like. The compression heat treatment apparatus is an annular apparatus in which thin rings are stacked with a certain gap, and fluid is sucked through the gap between the rings. The yarn in the compression heat treatment apparatus is folded, stayed for a certain time while being laminated, heat treated, and then ejected onto the rotary transfer apparatus. The crimped yarn ejected onto the rotary transfer device is in the form of a plug, but is transferred while being sucked by a punching hole on the surface of the rotary transfer device.

  Next, the crimped yarn on the rotary transfer device is sequentially taken out from the device and wound on two pairs of Nelson type rolls or separate type rolls having different rotational speeds to release the crimps. Stretching during this period is performed at 3 to 10%, and the yarn temperature is set at 40 to 60 ° C. If it is less than 3%, the crimp may not be completely solved. On the other hand, if it exceeds 10%, the crimp becomes too latent, and it becomes difficult to obtain bulkiness. Usually, the stretch tension at this time is continuously measured with a tensiometer and is constantly monitored for quality control. This stretch tension is closely related to the properties of the original yarn before crimping in the crimping process, the crimping treatment conditions, the conditions for unraveling the crimps, and the like. It affects the elongation rate and the crimp latent rate, and as a result, is related to improvement in durability such as bulkiness, settling resistance, and wear resistance of the crimped yarn, which is the effect of the present invention. A preferable stretch tension is, for example, a stretch tension when stretched by 6% is 0.05 to 0.2 cN / dtex, and more preferably 0.08 to 0.15 cN / dtex.

  Next, the crimped yarn is entangled through an entanglement nozzle. The entanglement nozzle usually has 2 to 6 holes, and entanglement treatment is performed by injecting 0.1 to 0.6 Pa of high-pressure air from a direction substantially perpendicular to the traveling crimped yarn. The number of entanglements and the strength of entanglement vary depending on the performance of the entanglement nozzle, the pressure and flow rate of the high-pressure air, the fineness and tension of the running yarn, etc. Set the confounding conditions so that

  On the other hand, when the crimping process is performed in a separate step, the processing method is not particularly limited, and a processing method that can obtain a polylactic acid crimped yarn suitable for the kneaded fabric of the present invention may be employed. That is, any method such as false twisting, stuffing method, air jet method, etc. may be used, and a method capable of obtaining characteristic crimped yarn properties such as bulkiness and stretchability, bulkiness and non-stretchability may be employed. In the case of the stuffing method, it can be performed according to the above-described continuous crimping process.

  Thus, the polylactic acid multifilament used for the anchorage of the present invention is obtained.

  Next, the manufacture of the remote area of the present invention will be described.

The fabric of the present invention is preferably a woven or knitted fabric base fabric using the above-mentioned polylactic acid filaments, particularly polylactic acid multifilaments. The base fabric of the woven or knitted fabric can be produced by a conventionally known method. For example, the form of the woven fabric is not particularly limited, and conventionally known forms such as plain weave, twill weave, satin weave, and entangled weave can be appropriately employed. The form of the knitted fabric is not particularly limited, and conventionally known forms such as circular knitting, weft knitting, tricot knitting, and Russell knitting can be appropriately employed. At this time, although it depends on the application, the weave density and the knitting density may be set so that the basis weight of the fabric is 100 to 2000 g / m ² and the apparent density is 0.4 to 1.0 g / cm ³ . Thereafter, the obtained base is subjected to processing such as coating, laminating, and dipping as necessary. Also for these processes, conventionally known methods can be employed, and the resin to be used can be appropriately employed according to the application and required characteristics. For example, to give water repellency, vinyl chloride, ethylene vinyl alcohol (EVA), polyurethane, and as a completely biodegradable type, polylactic acid, polycaprolactone, polybutylene succinate, and polyethylene succinate A biodegradable resin such as can be suitably used.

  The kite of the present invention is produced using the above-mentioned kite, and can be a kite that is lightweight and has a high-class feeling. In order to take advantage of the biodegradability of the material of the present invention, all other components of the material, such as the lining, sewing thread, handle, fastener, etc., are composed of biodegradable materials. Is preferred. Among them, since it is difficult to completely separate the sewing thread at the time of disposal, it is preferable to use a biodegradable polymer sewing thread, for example, a polylactic acid sewing thread.

  Bags include carry bags, travel bags, women's bags, small bags, Boston bags, student bags, handbags, shoulder bags, suitcases, rucksacks, knapsacks, sports bags, golf bags, various pouches, etc. Can be mentioned.

  Hereinafter, the present invention will be described in detail with reference to examples. The characteristic definitions and measurement methods described in the text and examples are as follows.

A. 25 mL of chloroform was added to a sample having a relative viscosity of 0.5 g, and the mixture was stirred for 5 hours to dissolve the polymer. Then, chloroform was added to dilute to 50 mL. The diluted solution was measured using a Schott AVS500 auto viscometer at a test temperature of 30 ° C., and the relative viscosity ηr was determined based on the following formula. The measurement was performed 3 times, and the average value was taken.

ηr = t / t ₀
t: number of seconds during which the solution flows
t ₀ : Flowing down seconds of solvent (chloroform only) Fineness Measured according to JIS L1090.

C. Strength and elongation Measured according to JIS L1013. The strength was measured using a Tensilon tensile tester manufactured by Orientec Corp. under the conditions of a test length of 250 mm and a tensile speed of 300 mm / min. The strength is a value obtained by dividing the strength by the total fineness of the sample.

D. Dry heat shrinkage rate Measured at 120 ° C. according to JIS L1013. Three samples were collected from the same sample and measured, and the average value was obtained.

E. Hollow ratio A cross section of a single yarn was cut, an enlarged photograph of 100 times was taken with an optical microscope, a cross-sectional area S of the whole single yarn including the hollow portion and a cross-sectional area T of the hollow portion were obtained, and calculated by the following formula. The average value of five specimens of the same sample was defined as the hollow ratio of the sample.
Hollow ratio (%) = 100 × T / S
F. Biodegradability A test piece of 200 mm length × 200 mm width was cut out from the fabric, and this test piece was put into compost maintained at a temperature of 58 ° C. and a moisture content of 65% by weight, taken out after one month and observed.
○: Decomposition is progressing, and there are many holes.
X: Almost the same as before input.

G. Apparent density The fabric weight (g / m ² ) and thickness (mm) were measured and calculated by the following formula. The average value of five locations was used.
Apparent density (g / cm ³ ) = (weight per unit area) × 10 ⁻³
H. Lightweight Ten testers lifted with 2 hands in a 2 m long x 2 m wide folded area, and sensory evaluated with the following indices.
◎: Extremely light as unimaginable from the thickness of the remote area ○: Extremely light against the thickness of the remote area.
Δ: Light to the contrary against the thickness of the base.
X: Weight as imagined from the thickness of the remote area.

I. Bulkiness Ten testers touched with a dominant hand in a folded state of a 2 m long × 2 m wide fold, and sensory-evaluated with the following indices.
A: Thickness is felt very much and the bulkiness is extremely excellent.
○: Thickness is felt and bulkiness is good.
Δ: The thickness is slightly insufficient, and the bulkiness is not so bad.
X: Thickness is insufficient and it is not so bulky.

J. et al. Abrasion Resistance A test piece having a diameter of 120 mm was cut out from the base material and attached to a Taber abrasion tester defined in ASTM D1175, and subjected to 500 rotation wear with a wear wheel CS # 10 and a load of 500 g. Then, the surface abrasion state of this test piece was observed, and the wear resistance was evaluated by the following index.

    A: No wear at all.

    ○: Almost no wear.

    Δ: Slightly worn

    ×: considerably worn.

K. High-quality feeling Ten testers touched with a dominant hand in a folded state of 2 m long x 2 m wide, and sensory-evaluated with the following indices.
A: Soft and supple, elastic, and very soft to the touch.
◯: Soft and supple, good touch Δ: Soft, but suppleness is slightly lacking, softness is reasonably good ×: Soft feeling and suppleness are lacking

[Production Example 1] (Production of polylactic acid)
Polymerization of lactide prepared from L-lactic acid with an optical purity of 99.5% in the presence of bis (2-ethylhexanoate) tin catalyst (lactide to catalyst molar ratio = 10000: 1) at 180 ° C. for 200 minutes in a nitrogen atmosphere. Polylactic acid P1 was obtained. The relative viscosity of the obtained polylactic acid was 4.0.

[Production Example 2] (Production of polylactic acid containing 5% by weight of EBA)
After drying P1 and ethylenebisstearic acid amide (EBA) [“Alfro H-50S” manufactured by NOF Corporation], EBA was weighed continuously so that P1: EBA = 95: 5 (weight ratio). Polylactic acid P2 containing 5% by weight of EBA was obtained by using a biaxial kneading extruder with a cylinder temperature of 200 ° C. while adding to P1.

[Production Example 3] (Production of polylactic acid containing 5% by weight of SA)
Polylactic acid P3 containing 5% by weight of SA was obtained in the same manner as in Production Example 2 except that EBA was changed to monoamide stearamide (SA) [“Alfro S-10” manufactured by NOF Corporation].

[Production Example 4] (Production of polylactic acid containing 15% by weight of colorant)
P1: Coloring agent (carbon black) = 85: 15 (weight ratio) In the same manner as in Production Example 2, polylactic acid P4 containing 15% by weight of coloring agent was obtained.

Example 1
P1 dried at 100 ° C for 12 hours under vacuum was charged into a hopper (1), and this chip was melted at 220 ° C with an extruder (2), and then spun on a spin block (3) heated to 220 ° C. The molten polymer was introduced into the pack (4) and spun from a die (5) having a slit width (18) of 0.35 mm, a slit diameter (19) of 1.8 mm, and a slit of 4 holes having 48 holes.

  Immediately below the base, 5cm above the base is the upper end, a heating cylinder (6) 30cm from the upper end and a 20cm heat insulation cylinder (7) are attached below it, and the temperature just below the base (20cm below the base, the center of the heating cylinder) The heating cylinder was heated so that the air layer temperature of the part was 230 ° C.

  An annular blow-off chimney (8) was attached immediately below the heat insulating cylinder, and cold air at 30 ° C. was blown onto the yarn at a speed of 30 m / min to cool and solidify, and then an oil was applied. Oils include iso-C24 alcohol / thiodipropionic acid ester (40% by weight), C11-15 alcohol AOA / thiodipropionic acid ester (30% by weight), trimethylolpropane AOA distearate (10% by weight), C8 alcohol AOA ( 10% by weight), hydrogenated castor oil (7% by weight), and stearylamine EO15 (3% by weight) diluted with mineral oil to 20% by weight were used as a non-aqueous oil agent.

  The unstretched yarn to which the oil agent was applied by the oiling device (9) was wound around a take-up roll (1FR) (10) rotating at a speed of 500 m / min. Next, the take-up yarn is continuously wound without being wound once, and after 1.5% stretch is applied between the take-up roll and the supply roll (2FR) (11). After three-stage heat stretching, the film was wound after giving 1.5% relaxation. 1FR is 60 ° C, 2FR is 100 ° C, the first stretching roll (1DR) (12) is 115 ° C, the second stretching roll (2DR) (13) is 140 ° C, and the third stretching roll (3DR) (14 ) Was 140 ° C., and the relaxation roll (RR) (15) was not heated.

  In addition, the entanglement nozzle (16) was attached between the relaxing roll and the winder (17), and entanglement was imparted to the fiber by injecting 0.2 MPa of compressed air. The first stage draw ratio was set to 34% of the overall draw ratio, the second stage and third stage draw ratios were both set to 33%, and the total draw ratio was 7 times (see FIGS. 1 and 2). Thus, a 470 dtex-48 fil polylactic acid fiber having a round hollow cross section was obtained. The obtained fiber was highly hollow with a hollow ratio of 41%, and exhibited good yarn properties with a strength of 5.1 cN / dtex, an elongation of 30.0%, and a dry heat shrinkage of 6.8%.

Using this fiber, a plain weave fabric was produced at a weaving density of 70 × 70 weft / inch. The obtained remote place was extremely good in biodegradability. Further, the weight per unit area was 265 g / m ² , the apparent density was 0.71 g / cm ³ , and it was excellent in lightness and bulkiness.

Examples 2 and 3
A polylactic acid fiber and a kneaded material were obtained in the same manner as in Example 1 except that the slit width and the slit diameter were changed. The fiber of Example 2 had a hollow ratio of 28%, and the fiber of Example 3 had a hollow ratio of 18%, which was slightly lower than that of Example 1. However, the lightness and bulkiness were excellent.

Comparative Example 1
The temperature of the heating cylinder was lowered, the temperature just below the base was changed to 100 ° C., and the polylactic acid fiber and the kneaded material were obtained in the same manner as in Example 2 except that the draw ratio was changed to 4.5 times. . Although the obtained fiber had a slightly low strength of 2.7 cN / dtex, it was highly hollow with a hollow ratio of 36%, and the fabric was excellent in lightness and bulkiness. In addition, when the draw ratio was 5 times or more, fluff and thread breakage occurred, and the process passability deteriorated.

Examples 4 and 5
Chip blend (EBA 1% by weight) so that P1: P2 = 4: 1 by weight ratio, or chip blend (EBA 4% by weight) so that P1: P2 = 1: 4 by weight ratio Produced polylactic acid fibers and a koji fabric in the same manner as in Example 1. The obtained fiber had high strength and high hollowness, and the wear resistance of the kneaded material was superior to the kneaded material of Example 1.

Example 6
The kneaded material obtained in Example 4 was dyed under the following conditions. When the fiber was unwound from a part of the kneaded material after dyeing and the strength was measured, 4.0 cN / dtex was found to be lower in strength than before dyeing (5.0 cN / dtex). The result was good.

<Dyeing conditions>
-Dye: Dianix Navy Blue ERFS 200 (2% owf)
-Auxiliary agent: pH adjuster (0.2 g / l)
-Temperature x time: 110 ° C x 40 minutes Example 7
Polylactic acid fiber in the same manner as in Example 1 except that the chip blend (EBA 1 wt%, colorant 0.3 wt%) was made so that the weight ratio was P1: P2: P4 = 4: 1: 0.1. And got a remote place. The obtained fiber had high strength and high hollowness, and the kneaded material was extremely excellent in biodegradability, light weight, and bulkiness. Also, the wear resistance was good.

Example 8
A polylactic acid fiber and a kneaded material were obtained in the same manner as in Example 7 except that the slit width and the slit diameter were changed. The obtained fiber had a hollowness of 17%, which was a little lower than that of Example 7 , and the lightness and bulkiness of the koji were reasonable.

Example 9
A polylactic acid fiber was obtained in the same manner as in Example 1 except that the chip blend (0.3% by weight of the colorant) was performed such that P1: P4 = 1: 0.02 by weight ratio. The obtained fiber had high strength and high hollowness and was uniformly black-colored.

Comparative Example 2
A polylactic acid fiber and a kneaded material were obtained in the same manner as in Example 1 except that the chip blend (SA 1 wt%) was used so that the weight ratio was P1: P3 = 4: 1. The obtained fiber was a fiber having a high hollow ratio although its strength was slightly low. This lowering of strength is suggested to be caused by a decrease in the molecular weight of polylactic acid by stearamide, which is a fatty acid monoamide.

Example 10
The polylactic acid fiber obtained in Example 1 was continuously preheated at a crimped preheating roll temperature of 130 ° C. as it was, and then subjected to a heating and air pressure treatment at 200 ° C. in a crimping processing apparatus to impart crimps. Next, the polylactic acid crimped yarn was obtained by stretching the crimp so that it does not sag, and finally winding it with a winding tension of about 0.07 cN / dtex. Further, using this crimped yarn, a kneaded material was obtained in the same manner as in Example 1. The obtained remote place was very excellent in lightness and bulkiness and was full of luxury.

Example 11
The polylactic acid fiber obtained in Example 7 was continuously preheated at a crimped preheating roll temperature of 130 ° C., and then subjected to a heating and air pressure treatment at 200 ° C. in a crimping processing apparatus to impart crimps. Next, the polylactic acid crimped yarn was obtained by stretching the crimp so that it does not sag, and finally winding it with a winding tension of about 0.07 cN / dtex. Further, using this crimped yarn, a kneaded material was obtained in the same manner as in Example 1. The obtained remote place was very excellent in lightness and bulkiness and was full of luxury. In addition, the wear resistance was excellent.

Comparative Example 3
A round solid cross section 470 dtex-48 fil polylactic acid fiber and a base material were obtained in the same manner as in Example 1 except that a die having 48 holes for solid cross section (pore diameter 0.6 mm) was used. It was. The obtained kneaded material had good biodegradability, but the lightness and bulkiness were inferior to the kneaded material of Example 1.

Comparative Example 4
A polylactic acid fiber and a kneaded material were obtained in the same manner as in Example 1 except that the slit width and the slit diameter were changed. Since the obtained fiber had a low hollowness of 6%, the lightness and bulkiness of the knot were not improved so much.

Comparative Example 5
A polylactic acid fiber and a kneaded material were obtained in the same manner as in Example 3 except that the temperature immediately below the base was changed to 300 ° C. Since the obtained fiber had a low hollowness of 9%, the lightness and bulkiness of the kneaded material were inferior to the kneaded material of Example 1.

Comparative Example 6
An 800 dtex-48 fil polylactic acid fiber and a kneaded material were obtained in the same manner as in Comparative Example 3 except that the discharge amount was changed. In addition, when the single yarn cross-sectional area of this fiber was confirmed with the optical microscope, it was substantially the same as the cross-sectional area S of the whole single yarn containing the fiber hollow of Example 1. FIG. The light weight and bulkiness of the obtained paddy were inferior to those of Example 1.

Comparative Example 7
ε-caprolactam was polymerized by a conventional method to produce a nylon 6 polymer having a relative viscosity of 3.2. (However, this relative viscosity was measured with a concentrated sulfuric acid (98.0%) solution of 0.5% by weight of the sample at 25 ° C. with an Ostwald viscometer.) A nylon 6 fiber having a cross section of 470 dtex-48 fil was obtained. Further, using this fiber, a remote place was obtained in the same manner as in Example 1. The obtained remote place was not biodegradable and could not be said to be an environmentally friendly material.

This figure is a schematic view showing a direct spinning drawing apparatus for producing the polylactic acid fiber of the present invention. This figure is a schematic cross-sectional view showing the shape of a die hole when producing the polylactic acid fiber of the present invention. This figure is a schematic cross-sectional view showing the shape of a die hole when producing the polylactic acid fiber of the present invention. This figure is a schematic cross-sectional view showing the shape of a die hole when producing the polylactic acid fiber of the present invention.

Explanation of symbols

1: Hopper 2: Extrusion kneader (Extruder)
3: Spin block 4: Spin pack 5: Base 6: Heating cylinder 7: Heat insulation cylinder 8: Chimney 9: Oiling device (oiling roller)
10: Take-up roll (1FR)
11: Yarn feeding roll (2FR)
12: First stretching roll (1DR)
13: Second stretching roll (2DR)
14: Third stretching roll (3DR)
15: Relaxing roll (RR)
16: Entangling nozzle 17: Winder 18: Slit width 19: Slit diameter

Claims (7)

Have a hollow ratio of 11 to 70%, bag fabric strength is characterized by comprising a polylactic acid multifilament is 4.2~9cN / dtex. The hollow portion of the polylactic acid multifilament, bag fabric as claimed in claim 1, characterized in that formed in the melt-spinning process. Bag fabric as claimed in claim 1 or 2 polylactic acid multifilament is characterized in that the crimped yarn or dyed yarns. Polylactic acid multifilament fatty bisamide and / or alkyl-substituted fatty acid monoamide, according to claim 1, characterized in that it contains 0.1 to 5% by weight based on the total weight the filament Remote area. The single- fiber fineness of the polylactic acid multifilament is 1 to 25 dtex, and the total fineness is 15 to 2500 dtex, The kneaded fabric according to any one of claims 1 to 4 . Basis weight of 100 to 2000 g / m ^2, the bag fabric as claimed in any one of claims 1 to 5, apparent density, characterized in that a woven or knitted fabric 0.4~1.0g / cm ^3. A cocoon made using the shore of any one of claims 1 to 6 .

Images