JP2008223177A - Rope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rope by which the amount of generated carbon dioxide can be reduced, and the strength of a fiber comprising a biomass-originated polymer inferior to that of a fiber comprising a petroleum-originated general-purpose polymer can be compensated by using the fiber comprising the biomass-originated polymer as a part of the rope without the rope constituted only of the conventional fiber comprising the petroleum-originated polymer. <P>SOLUTION: The rope is constituted by intertwining or combining two or more strands 2. Each strand 2 exhibits two-layered structure of a sheath yarn 6 and a core yarn 5. At least a part of the sheath yarn 6 is constituted of the fiber comprising the biomass-originated polymer, or at least a part of the core yarn 5 is constituted of the fiber comprising the biomass-originated polymer. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rope, and more particularly to a rope composed of a plurality of strands.

  Conventionally used ropes include twisted ropes, cross ropes, etc., and these ropes are constructed by conventionally known methods, and are widely used for civil engineering applications, construction applications, ship mooring applications, etc. Yes.

  The required performance in using the rope includes strength, wear resistance, creep performance and the like. In order to satisfy these required performances, synthetic fibers used for ropes include general-purpose synthetic fibers such as polyamide-based, polyester-based, and polyethylene-based fibers, and so-called super fibers (Patent Document 1).

  By the way, most of these synthetic fibers are made from valuable fossil resources such as petroleum, but in recent years, fossil resources are not only concerned about the shortage of resources, but also about the amount of carbon dioxide generated. It has a great impact on society. Carbon dioxide immobilization is expected to be effective in preventing global warming, and carbon dioxide immobilization substances are particularly attracting attention, especially against the Kyoto Protocol that imposes a target for reducing carbon dioxide. Active use of biomass-derived materials as immobilization materials is desired. Carbon dioxide produced when biomass-derived synthetic fibers and synthetic resins are burned is originally in the air and does not increase in the atmosphere. This is called carbon neutral and tends to be regarded as important.

However, many of the synthetic fibers derived from biomass are inferior in strength to conventional fibers composed of petroleum-based general-purpose polymers. Further, there is a problem that the degree of polymerization is greatly reduced by wet heat treatment such as dyeing, and this also causes a reduction in strength.
JP 2004-211123 A

  The present invention has been made in view of such a current situation, and is not a rope composed only of fibers made of a conventional petroleum-based general-purpose polymer, but a fiber made of biomass-derived polymer, at least part of the rope. The purpose of the present invention is to provide a rope capable of reducing the amount of carbon dioxide generated and compensating for inferior strength or the like of fibers made from biomass-derived polymers compared to fibers made from petroleum-based general-purpose polymers. To do.

  As a result of intensive studies to solve such problems, the present inventors have found that a fiber made of a biomass-derived polymer is used in at least a part of the rope, and that its strength and the like are petroleum-based general-purpose polymers. The present inventors have found the fact that it is substantially the same level as a rope composed of only fibers made of

That is, the means for solving the problems in the present invention are as follows.
1. A rope having a structure in which a plurality of strands are twisted or combined, and each strand has a two-layer structure of a sheath yarn and a core yarn, and at least a part of the sheath yarn is a biomass-derived polymer. A rope characterized by being composed of fibers made of

  2. The core yarn is composed of a fiber made of a petroleum-based general-purpose polymer. Rope.

  3. 1. A plurality of strands are arranged around a fiber core in the center. Or 2. Rope.

  4). A rope in which a plurality of strands are arranged around a fiber core in the center, wherein at least a part of the strand is composed of a yarn made of a polymer derived from biomass.

  5. 3. The fiber core is composed of fibers made of a general-purpose polymer derived from petroleum. Rope.

  6). A rope having a structure in which a plurality of strands are twisted or combined, each strand has a two-layer structure of a sheath yarn and a core yarn, and at least a part of the core yarn is a biomass-derived polymer A rope characterized by being composed of fibers made of

  7. 5. The sheath yarn is composed of a fiber made of a general-purpose polymer derived from petroleum. Rope.

  8). 5. A plurality of strands are arranged around a central fiber core. Or 7. Rope.

  9. A rope in which a plurality of strands are arranged around a central fiber core, wherein at least a part of the fiber core is composed of fibers made of biomass-derived polymer.

  10. 8. Each strand is composed of a yarn made of a general-purpose polymer derived from petroleum. Rope.

  11. 1. The polymer derived from biomass is polylactic acid. To 10. Any rope up.

  12 1. A petroleum-derived general-purpose polymer is polyethylene terephthalate. 3. 5. 7. , 8. 10. 11. One of the ropes.

  According to the present invention, not a conventional rope made of only petroleum-based general-purpose polymers, but a fiber made of biomass-derived polymer is disposed only on the surface of the rope in its cross section. It is possible to provide a rope that can reduce the carbon generation amount and can compensate for the inferior strength of fibers made of biomass-derived polymers compared to fibers made of petroleum-based general-purpose polymers.

  In addition, according to the present invention, not a conventional rope made of only petroleum-based general-purpose polymer, but a fiber made of biomass-derived polymer is arranged only on the inner side in the cross section of the rope. It is possible to provide a rope that can reduce the amount and compensate for the abrasion resistance that is inferior to fibers made from biomass-derived polymers compared to fibers made from petroleum-based general-purpose polymers.

  As shown in FIG. 1, the rope 1 of the present invention is composed of a plurality of strands 2, and each strand 2 is composed by twisting or combining a plurality of yarns. Specific examples of the configuration of the rope 1 include a two-stranded rope, a three-stranded rope, and a four-stranded rope, but the present invention is not limited to these. For example, a so-called cross rope can be used.

  Each strand 2 is composed of a core yarn that forms the core portion 3 and a sheath yarn that forms the sheath portion 4, for example, as shown in FIG. 2, around a plurality of core yarns 5 that form the core portion 3. However, it exhibits a two-layer structure covered with a plurality of sheath yarns 6 forming the sheath portion 4. Each core yarn 5 and each sheath yarn 6 are composed of a single fiber or a plurality of twisted fibers.

  When the rope 1 of the present invention exerts sufficient strength, as shown in FIG. 1 and FIG. 2, a fiber made of a petroleum-derived general-purpose polymer is used as the fiber constituting the core yarn 5, and the sheath yarn 6 A fiber made of a polymer derived from biomass is used for at least a part of.

  The ratio of the biomass-derived polymer to the petroleum-based general-purpose polymer in the core yarn 5 and the sheath yarn 6 constituting the strand 2 shown in FIGS. 1 and 2 is 2: 8 to 8: 2 in mass ratio. The ratio is preferably 4: 6 to 6: 4. When the ratio of the polymer derived from biomass is less than 2 or less, it becomes difficult to obtain the effect of the present invention, that is, the effect of reducing the amount of carbon dioxide generated when burned, and when the ratio of the polymer derived from biomass exceeds 8, This leads to a decrease in the breaking strength of the rope.

  In addition to the configuration shown in FIGS. 1 and 2, as shown in FIG. 3, a fiber core (core rope) 7 is arranged at the center of the rope 1, and a plurality of strands 2 are arranged around the fiber core 7. It is also possible to adopt an arrangement. The fiber core 7 may be a single fiber or a twist of a plurality of fibers. The fiber used for the fiber core 7 may be either a fiber made of a polymer derived from biomass or a fiber made of a general-purpose polymer derived from petroleum.

  Instead of the configuration of FIG. 3, as shown in FIG. 4, fibers made of petroleum-based general-purpose polymer are arranged on the fiber core 7, and a plurality of strands 2 arranged around the fiber core 7 are configured. By making all the fibers of the yarn 8 into fibers made of biomass-derived polymer, the entire rope 1 has a two-layer structure composed of a core (fiber core 7) and a sheath (strand 2). It is also possible to have it. The ratio of the core part (fiber core 7) and the sheath part (strand 2) at this time is preferably 2: 8 to 8: 2 by mass ratio, particularly preferably 4 as in the case described above. : 6 to 6: 4. The reason is the same as in the above case.

  As shown in FIGS. 5 and 6, when the rope 11 according to another aspect of the present invention exhibits sufficient wear resistance, a plurality of core yarns 15 forming the core portion 13 of the strand 12 are used. A fiber made of a polymer derived from biomass is used for at least a part of the fiber, and a fiber made of a general-purpose polymer derived from petroleum is used for the fiber constituting the sheath portion 14 of the strand 12.

  The ratio of the biomass-derived polymer and the petroleum-based general-purpose polymer in the core yarn 15 and the sheath yarn 16 constituting the strand 12 shown in FIGS. 5 and 6 is 2: 8 to 8: 2 in mass ratio. The ratio is preferably 4: 6 to 6: 4. When the ratio of the polymer derived from biomass is less than 2 or less, it becomes difficult to obtain the effect of the present invention, that is, the effect of reducing the amount of carbon dioxide generated when burned, and when the ratio of the polymer derived from biomass exceeds 8, The effect of exhibiting wear resistance is difficult to obtain.

  In this case as well, in addition to the configuration shown in FIGS. 5 and 6, as shown in FIG. 7, a fiber core (strand) 17 is arranged at the center of the rope 11 and around the fiber core 17. A configuration in which a plurality of strands 12 are arranged is also possible. The fiber core 17 may be a single fiber or a twist of a plurality of fibers. The fiber used for the fiber core 17 may be either a fiber made of a polymer derived from biomass or a fiber made of a general-purpose polymer derived from petroleum.

  In place of the configuration of FIG. 7, as shown in FIG. 8, fibers made of biomass-derived polymer are arranged on the fiber core 17, and all the strands 12 constituting the plurality of strands 12 arranged around the fiber core 17 are arranged. By making the fiber of the yarn 18 a fiber made of a petroleum-based general-purpose polymer, the entire rope 11 has a two-layer structure composed of a core part (fiber core 17) and a sheath part (strand 12). It is also possible to have it. The ratio of the core part (fiber core 17) and the sheath part (strand 12) at this time is preferably 2: 8 to 8: 2 by mass ratio, particularly preferably 4 as in the case described above. : 6 to 6: 4. The reason is the same as in the above case.

  Next, fibers used in the rope of the present invention will be described. The fiber made of the petroleum-based general-purpose polymer used in the present invention is not particularly limited as long as it can be melt-spun. Specifically, polyesters represented by polyalkylene terephthalates such as polyethylene terephthalate (PET), polybutylene terephthalate, polytrimethylene terephthalate; polyamides represented by nylon 6, nylon 66, nylon 46, nylon 11 and nylon 12; Polyolefins typified by polypropylene and polyethylene; polychlorinated polymers typified by polyvinyl chloride and polyvinylidene chloride; polytetrafluoroethylene and copolymers thereof, and fluorinated fibers typified by polyvinylidene fluoride . Of these, low cost polyesters are preferred.

  Polyester polymers include aromatic dicarboxylic acids such as isophthalic acid and 5-sulfoisophthalic acid; aliphatics such as adipic acid, succinic acid, suberic acid, sebacic acid, and dodecanedioic acid in terms of viscosity and thermal properties. Dicarboxylic acid; aliphatic diol such as ethylene glycol, propylene glycol, 1,4-butanediol, 1,4-cyclohexanedimethanol; glycolic acid, hydroxybutyric acid, hydroxyvaleric acid, hydroxycaproic acid, hydroxypentanoic acid, hydroxyheptanoic acid , Hydroxycarboxylic acids such as hydroxyoctanoic acid; aliphatic lactones such as ε-caprolactone may be copolymerized.

  The fiber made of the biomass-derived polymer used in the present invention is not particularly limited as long as it can be melt-spun. Specifically, polymers formed by chemically polymerizing biomass monomers such as PLA (polylactic acid), PTT (polytrimethylene terephthalate), PBS (polybutylene succinate), and PHA (polyhydroxybutyrate) such as polyhydroxybutyric acid. And microbial production systems such as alkanoates). Among them, polylactic acid is preferable because it is thermally stable and has heat resistance and has been relatively mass-produced.

  Examples of polylactic acid include poly D-lactic acid, poly L-lactic acid, poly D-lactic acid which is a copolymer of poly D-lactic acid and poly L-lactic acid, and a mixture of poly D-lactic acid and poly L-lactic acid (stereo Complex), a copolymer of poly D-lactic acid and hydroxycarboxylic acid, a copolymer of poly L-lactic acid and hydroxycarboxylic acid, poly D-lactic acid or poly L-lactic acid, aliphatic dicarboxylic acid and aliphatic diol A copolymer of these or a blend thereof is preferred.

  There are polylactic acids in which L-lactic acid and D-lactic acid are used alone as described above, or those in which both are used in combination. Among them, the melting point is 120 ° C. or higher, and the heat of fusion is 10 J / What is more than g is suitable from a heat resistant viewpoint. That is, a rope in which a plurality of strands are twisted together or combined is usually passed through a process that is set with high frequency, dry heat or wet heat in the manufacturing process so that loosening does not occur during use. It is. Since this setting step is performed at a high temperature that does not deteriorate the fiber properties, it is preferable to impart the heat resistance as described above to the fibers. Moreover, in order to make it difficult to receive the damage by the frictional heat which generate | occur | produces in contact with a wall, concrete, etc. when used as a rope, it is suitable to provide the above heat resistance to a fiber.

  The melting point of L-lactic acid and D-lactic acid, which are homopolymers of polylactic acid, is about 180 ° C., but in the case of a copolymer of D-lactic acid and L-lactic acid, the proportion of any component is 10 mol%. The melting point is about 130 ° C.

  Furthermore, in the copolymer, when the proportion of any component of D-lactic acid and L-lactic acid is 18 mol% or more, the melting point is less than 120 ° C. and the heat of fusion is less than 10 J / g, almost completely. Amorphous nature. When such an amorphous polymer is used, it becomes difficult to heat-stretch particularly in the production process, and it becomes difficult to obtain a high-strength fiber. Even if a fiber is obtained, heat resistance, abrasion resistance The problem that it becomes inferior will arise. Therefore, as the polylactic acid, L / D or D / L, which is the content ratio (molar ratio) of L-lactic acid or D-lactic acid when polymerizing using lactide as a raw material, is preferably 82 or more / 18 or less. Of these, those of 90 or more and 10 or less, and more preferably 95 or more and 15 or less are preferable.

  In the case of a copolymer of polylactic acid and hydroxycarboxylic acid, specific examples of hydroxycarboxylic acid include glycolic acid, hydroxybutyric acid, hydroxyvaleric acid, hydroxycaproic acid, hydroxypentanoic acid, hydroxyheptanoic acid, hydroxyoctanoic acid, etc. Is mentioned. Of these, the use of hydroxycaproic acid or glycolic acid is preferred from the viewpoint of cost. In the case of a copolymer of polylactic acid and aliphatic dicarboxylic acid and aliphatic diol, the aliphatic dicarboxylic acid and aliphatic diol include sebacic acid, adipic acid, dodecanedioic acid, trimethylene glycol, 1,4-butane. Diol, 1,6-hexanediol, etc. are mentioned. Thus, when making polylactic acid copolymerize another component, it is preferable that polylactic acid shall be 80 mol% or more. If it is less than 80 mol%, the copolymerized polylactic acid has a melting point of less than 120 ° C. and a heat of fusion of less than 10 J / g, and the crystallinity tends to be low.

  As the molecular weight of polylactic acid, the melt flow rate measured at a temperature of 210 ° C. and a load of 21.2 N (2160 g) according to ASTM D-1238 method used as an index of molecular weight is 1 to 100 [g / 10 min]. It is preferable that it is 5-50 [g / 10min]. By setting the melt flow rate within this range, strength, wet heat decomposability, and wear resistance are improved. For the purpose of enhancing the durability of polylactic acid, a terminal blocking agent such as an aliphatic alcohol, a carbodiimide compound, an oxazoline compound, an oxazine compound, or an epoxy compound may be added to polylactic acid.

  As described above, the sheath yarn 6 and the core yarn 15 are required to be composed of fibers made of a polymer derived from biomass at least in part. General-purpose polymers derived from petroleum can be used. Examples of the method used include a method used as a composite fiber such as a core-sheath composite fiber and a side-by-side composite fiber, and a method used by co-twisting with a fiber derived from biomass.

  Various known additives that are effective as fillers, thickeners, crystal nucleating agents, and the like can be added to the above-described petroleum-based general-purpose polymers and biomass-derived polymers as necessary. Specifically, carbon black, calcium carbonate, silicon oxide and silicate, zinc white, high-site clay, kaolin, basic magnesium carbonate, mica, talc, quartz powder, diatomaceous earth, dolomite powder, titanium oxide, oxidation Aliphatic amide compounds such as zinc, antimony oxide, barium sulfate, calcium sulfate, alumina, calcium silicate, boron nitride, behenamide, aliphatic urea compounds, benzylidene sorbitol compounds, crosslinked polymer polystyrene, rosin metals Examples thereof include salt, glass fiber, and whisker. These may be added as they are, or may be added after a treatment necessary for forming a nanocomposite. In order to achieve low cost and good physical property balance, an inorganic filler is preferably blended. Moreover, it is preferable to mix a crystal nucleating agent.

  Further, for petroleum-derived general-purpose polymers and biomass-derived polymers, if necessary, coloring agents such as pigments and dyes; odor absorbents such as activated carbon and zeolite; Fragrances such as vanillin and dextrin; stabilizers such as antioxidants and UV absorbers; lubricants; mold release agents; water repellents; antibacterial agents; matting agents; light proofing agents; Flame retardants; surface modifiers; various inorganic and organic electrolytes and other secondary additives can be blended.

  It is also possible to use a plasticizer in combination with the petroleum-based general-purpose polymer and biomass-derived polymer as long as the effects of the present invention are not impaired. By using a plasticizer, it is possible to reduce the melt viscosity at the time of heat processing, particularly at the time of extrusion processing, and to suppress a decrease in molecular weight due to shearing heat generation or the like. In some cases, an improvement in the crystallization speed can be expected. Although there is no limitation in particular as a plasticizer, the following can be illustrated. For example, when the polymer derived from biomass is an aliphatic polyester biodegradable polyester, an ether plasticizer, an ester plasticizer, a phthalic acid plasticizer, a phosphorus plasticizer, or the like is preferable as a plasticizer. From the viewpoint of excellent compatibility with polyester, ether plasticizers and ester plasticizers are more preferable. Examples of ether plasticizers include polyoxyalkylene glycols such as polyethylene glycol, polypropylene glycol, and polytetramethylene glycol. Examples of ester plasticizers include esters of aliphatic dicarboxylic acids and aliphatic alcohols. Among these, examples of the aliphatic dicarboxylic acid include oxalic acid, succinic acid, sebacic acid, and adipic acid. Examples of the aliphatic alcohol include monohydric alcohols such as methanol, ethanol, n-propanol, isopropanol, n-hexanol, n-octanol, 2-ethylhexanol, n-dodecanol, stearyl alcohol; ethylene glycol, 1,2-propylene Dihydric alcohols such as glycol, 1,3-propylene glycol, 1,3-butanediol, 1,5-pentanediol, 1,6-hexanediol, diethylene glycol, neopentyl glycol, and polyethylene glycol; glycerin, trimethylolpropane, Mention may be made of polyhydric alcohols such as pentaerythritol. Further, it is selected from a copolymer composed of a combination of two or more of the ether plasticizer and the ester plasticizer, a di-copolymer, a tri-copolymer, a tetra-copolymer, or the like, or a homopolymer or copolymer thereof. Two or more kinds of blends may be mentioned. Furthermore, esterified hydroxycarboxylic acid and the like can be mentioned. At least one kind of the plasticizer can be used.

  Next, the present invention will be specifically described by way of examples. In addition, measurement and evaluation of various values in the following examples and comparative examples were performed as follows.

(1) Tensile strength / elongation According to JIS L-1013, an autograph AG-I type manufactured by Shimadzu Corporation was used and measured at a sample length of 25 cm and a tensile speed of 30 cm / min.

(2) Abrasion resistance In accordance with the abrasion resistance test of JIS D4604 "Automobile parts seat belt" using a belt abrasion tester, load 1.96N (200g), stroke length 330 ± 30mm, and SIANOR # 1600 sandpaper. Contact the wound hexagonal bar (angular radius 0.5 ± 0.1 mm, width across flats 6.35 ± 0.03 mm) at an angle of 85 ± 2 degrees and a stroke speed of 30 ± 1 times / min Reciprocating friction was performed under the conditions, and the number of frictions until the rope broke was measured.

(Example 1)
As polylactic acid (hereinafter abbreviated as “PLA”), the ratio of L-lactic acid / D-lactic acid is 99/1 in molar ratio, the melt flow rate is 7 g / 10 min, and the melting point is 168 ° C. Poly L / D lactic acid (manufactured by Nature Works) having a heat of fusion of 38 J / g was used. This was spun at 200 ° C. and drawn to be fiberized.

  As polyethylene terephthalate (hereinafter abbreviated as “PET”), ethylenediol and terephthalate having an intrinsic viscosity of 1.05 at a concentration of 0.5 g / deciliter and a temperature of 20 ° C. using an equimolar mixture of phenol and ethane tetrachloride as a solvent. A polymer with acid was used. This was spun at 290 ° C. and drawn to be fiberized.

  Three PET multifilaments of 1100 dtex / 192 filaments are twisted with a twist number of S-120 T / M to form a core yarn, and ten core yarns are twisted with a twist number of S-100 T / M to form a core part. Got. Subsequently, three PLA fibers of 1100 dtex / 140 filaments were twisted at a twist number of S-120 T / M to form a sheath yarn, and the core yarn was surrounded by a twist number of S-100 T / M using 10 sheath yarns. Covered with M to obtain a strand. The strand of Example 1 having an outer diameter of 5 mm was obtained by twisting three strands of this strand with a twist number of Z-40 T / M.

(Example 2)
The same PLA and PET as in Example 1 were used. Then, three PET multifilaments of 1100 dtex / 192 filaments are twisted with a twist number of S-120 T / M to form a yarn, and 12 yarns are twisted with a twist number of S-100 T / M to form a fiber core. Got. Next, two 1100 dtex / 140 filament PLA multifilaments were twisted at a twist number of S-120 T / M to form a yarn, and four yarns were twisted at a twist number of S-100 T / M to obtain a strand. . The rope of Example 2 having an outer diameter of 5 mm was obtained by covering the periphery of the fiber core with the twist number Z-40 T / M using the three strands.

(Example 3)
The same PLA as in Example 1 was used in place of the PET in Example 1 as the polymer forming the multifilament of the core yarn. And otherwise, it carried out similarly to Example 1, and obtained the rope of Example 3 with an outer diameter of 5 mm.

Example 4
The same PLA as in Example 1 was used. Further, PET obtained by copolymerizing 15 mol% of isophthalic acid having a melting point of 217 ° C. with the PET of Example 1 was used. And after drying each polymer chip | tip under reduced pressure, it supplies to a concentric core-sheath type | mold composite melt spinning apparatus, PET is distribute | arranged to a core part and PLA is distribute | arranged to a sheath part, and composite ratio is 50/50 by mass ratio. Then, melt spinning was performed at 240 ° C. Subsequently, the obtained composite fiber 100 dtex / 96 filament was twisted at a twist number S-120 T / M to form a core yarn, and ten core yarns were twisted at a twist number S-100 T / M. A core was obtained. Next, three of the above-mentioned composite fibers are twisted at a twist number of 120 T / M to form a sheath yarn, and the periphery of the core is covered with a twist number of S-100 T / M using 10 of the sheath yarns. Obtained. The strand of Example 4 having an outer diameter of 5 mm was obtained by twisting three strands of this strand with a twist number of Z-40 T / M.

(Example 5)
Three PLA fiber 1100 dtex / 140 filaments are prepared using the same PLA as in Example 1, and are twisted at a twist number S-120 T / M to form a core yarn. Ten core yarns are twisted S The core was obtained by twisting at -100 T / M. And the rope of Example 5 was obtained by twisting the circumference | surroundings of this core part by 20 T / M with the strand obtained in Example 1.

(Example 6)
Three PET fibers 100 dtex / 192 filaments are prepared using the same PET as in Example 1, and are twisted at a twist number of S-120 T / M to form a core yarn. Ten core yarns are twisted at a twist number S. The core was obtained by twisting at -100 T / M.

  Further, using the same PLA as in Example 1, three 1100 dtex PLA fibers were twisted at a twist number of S-120 T / M to form a core yarn, and 10 core yarns were twisted at a number of twists of S-100 T / M. And twisted to obtain a core. Subsequently, three PET multifilaments of 1100 dtex / 192 filaments were twisted at a twist number of S-120 T / M to form a sheath yarn, and the core yarn was surrounded by a twist number of S-100 T / M by the ten sheath yarns. And obtained a strand.

  The rope of Example 6 was obtained by twisting 6 strands at 20 T / M with the strand comprised by said PLA fiber around the core part comprised by said PET fiber.

(Comparative Example 1)
Using the same PET as in Example 1, six PET multifilaments of 1100 dtex / 192 filaments were twisted at a twist number of S-120 T / M to form a yarn, and ten yarns were twisted at a twist number of S-100 T / M A strand was obtained by twisting with M. A strand of Comparative Example 1 having an outer diameter of 5 mm was obtained by twisting three strands thus obtained with a twist number of Z-40 T / M.

  Table 1 shows the characteristic values of the ropes of Examples 1 to 6 and Comparative Example 1.

  As shown in Table 1, although the strength of the ropes of Examples 1 to 4 was inferior to the strength of the rope of Comparative Example 1, it had a certain level. The strength of the ropes of Example 5 and Example 6 was superior to the strength of the rope of Comparative Example 1. Although the rope of Comparative Example 1 is excellent in rope strength but does not contain PLA, it is difficult to obtain the effect of reducing the amount of carbon dioxide generated when burned, and the effect of the present invention is not exhibited. .

  Based on the above, the ropes of Examples 1 to 6 sufficiently exhibited the effects of the present invention.

(Example 7)
The rope of Example 7 with an outer diameter of 5 mm was obtained by twisting three strands obtained in Example 6 at a twist number of Z-40 T / M.

(Example 8)
The same PLA and PET as in Example 1 were used. Then, two 1100 dtex PLA fibers were twisted at a twist number of S-120 T / M to form a yarn, and twelve yarns were twisted at a twist number of S-100 T / M to obtain a fiber core. Subsequently, two 1100 dtex PET fibers were twisted at a twist number of S-120 T / M to form a yarn, and six yarns were twisted at a twist number of S-100 T / M to obtain a strand. The rope of Example 8 having an outer diameter of 5 mm was obtained by covering the periphery of the fiber core with the twist number Z-40 T / M using these three strands.

Example 9
The same PLA and PET as in Example 1 were used. Then, six 1100 dtex PLA fibers were twisted with a twist number S-120 T / M to form a core yarn, and nine core yarns were twisted with a twist number S-100 T / M to obtain a core part. . Next, a 1100 dtex PET fiber is singly twisted at a twist number of S-120 T / M to form a sheath yarn, and the core yarn is covered with a twist number of S-100 T / M using six sheath yarns, and a strand Got. The strand of Example 9 having an outer diameter of 5 mm was obtained by twisting three strands of this strand with a twist number of Z-40 T / M.

(Example 10)
Instead of PET in Example 7, the same PLA as in Example 1 was used. And otherwise, it carried out similarly to Example 7, and obtained the rope of Example 10 with an outer diameter of 5 mm.

(Comparative Example 2)
The same PET as in Example 1 was used. Then, six 1100 dtex PET fibers were twisted at a twist number of S-120 T / M to form a yarn, and ten yarns were twisted at a twist number of S-100 T / M to obtain a strand. The strand of Comparative Example 2 having an outer diameter of 5 mm was obtained by twisting three strands of this strand with a twist number of Z-40 T / M.

  Table 2 shows the characteristic values of the ropes of Examples 7 to 10 and Comparative Example 2 and the evaluation results of the abrasion resistance.

  As shown in Table 2, while the ropes of Examples 7 and 8 contain PLA fibers, their wear resistance is substantially higher than that of the rope of Comparative Example 2 composed only of PET fibers. There was no serious discoloration, and it could be said that it was at the same level. In contrast, the rope of Example 10 formed only with PLA fibers and the rope of Example 9 having a high PLA fiber ratio have low wear resistance, but generate carbon dioxide when burned. The effect of reducing the amount was great. Since the rope of Comparative Example 2 was composed only of PET fibers, it was difficult to obtain the effect of reducing the amount of carbon dioxide generated when burned, and the effect of the present invention was not exhibited. there were.

  Based on the above, the ropes of Examples 7 to 10 sufficiently exhibited the effects of the present invention.

It is a figure which shows the rope of embodiment of this invention. It is a figure which shows the cross-section of the rope of FIG. It is a figure which shows the cross-section of the rope of other embodiment of this invention. It is a figure which shows the cross-section of the rope of further another embodiment of this invention. It is a figure which shows the rope of other embodiment of this invention. It is a figure which shows the cross-section of the rope of FIG. It is a figure which shows the cross-section of the rope of further another embodiment of this invention. It is a figure which shows the cross-section of the rope of further another embodiment of this invention.

Explanation of symbols

1 rope 2 strand 3 core part 4 sheath part 5 core yarn 6 sheath yarn

Claims (12)

  A rope having a structure in which a plurality of strands are twisted or combined, and each strand has a two-layer structure of a sheath yarn and a core yarn, and at least a part of the sheath yarn is a biomass-derived polymer. A rope characterized by being composed of fibers made of   2. The rope according to claim 1, wherein the core yarn is composed of a fiber made of a general-purpose polymer derived from petroleum.   The rope according to claim 1 or 2, wherein a plurality of strands are arranged around a fiber core in the center.   A rope in which a plurality of strands are arranged around a fiber core in the center, wherein at least a part of the strand is composed of a yarn made of a polymer derived from biomass.   5. The rope according to claim 4, wherein the fiber core is composed of fibers made of a petroleum-derived general-purpose polymer.   A rope having a structure in which a plurality of strands are twisted or combined, each strand has a two-layer structure of a sheath yarn and a core yarn, and at least a part of the core yarn is a biomass-derived polymer A rope characterized by being composed of fibers made of   The rope according to claim 6, wherein the sheath yarn is made of a fiber made of a petroleum-derived general-purpose polymer.   The rope according to claim 6 or 7, wherein a plurality of strands are arranged around a fiber core in the center.   A rope in which a plurality of strands are arranged around a central fiber core, wherein at least a part of the fiber core is composed of fibers made of biomass-derived polymer.   The rope according to claim 9, wherein each strand is composed of a yarn made of a general-purpose polymer derived from petroleum.   The rope according to any one of claims 1 to 10, wherein the polymer derived from biomass is polylactic acid.   The rope according to any one of claims 2, 3, 5, 7, 8, 10, and 11, wherein the petroleum-based general-purpose polymer is polyethylene terephthalate.

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