JP6037604B2 - Flat strip structure and manufacturing method thereof - Google Patents

Description

  The present invention relates to a flat belt-like structure and a manufacturing method thereof.

  Leaf springs, coil bones, and the like having a band shape are used for shape-retaining members, shaping members for clothing, or vibration-proofing members for structures, taking advantage of their elasticity. In particular, the coil bone can be bent elastically in the width direction and the thickness direction and has a slight elasticity in the length direction, so that it is a reinforcing member for correction underwear such as a corset and a brassiere, or a bone of an unloading device. It is used for applications such as materials.

  As such a structure, for example, Patent Document 1 discloses a coil bone for clothing using a shape memory alloy. Patent Document 2 proposes a core material for foundation in which a core material made of a shape memory alloy is inserted into a resin coil bone. Patent Document 3 discloses a core material for clothing in which an elastic body made of an alloy made of nickel and titanium is provided with a coating containing a synthetic resin.

  However, since the coil bone and the core material disclosed in Patent Documents 1 to 3 all include a metal material, a problem of metal allergy occurs when it comes into contact with the skin, a feeling of wearing is inferior, or due to metal fatigue. There was a problem of being damaged. Furthermore, since the density increases, there are cases where its use is limited in applications where lightness is required.

  In order to solve such a problem, a non-metallic strip structure is desired. For example, in Patent Document 4, an elastic member is obtained by forming two elastic linear bodies into a flat coil shape and alternately inserting and combining them. Examples of the elastic linear material include a synthetic resin as well as a metal wire. Patent Document 5 discloses a shape-retaining rod-shaped body in which a flat-shaped body made of a nylon resin is coated with a styrene-butadiene-based resin. Patent Document 6 discloses a belt-like body formed by weaving synthetic resin monofilaments. Furthermore, Patent Document 7 discloses a reinforcing core material obtained by molding a string obtained by stringing a multifilament made of a polymer.

  However, the structures disclosed in Patent Documents 4 to 7 have a problem that they are inferior in flexibility. Therefore, there is a problem that it is easy to break when a large load is applied.

Japanese Patent No. 2604515 No. 7-14326 No. 4-31204 JP 59-130303 A Japanese Patent No. 2774460 Japanese Patent No. 4471570 JP 2005-281927 A

  Accordingly, an object of the present invention is to solve the above-described problems and to provide a flat belt-like structure that is excellent in flexibility even if it is made of non-metal.

As a result of intensive studies to solve the above-mentioned problems, the present inventors have reached the present invention.
That is, the present invention has the following contents.
(1) A spiral linear body rotating clockwise and a spiral linear body rotating counterclockwise having the same pitch are alternately combined in each loop-shaped portion to form a strip, and the strip is formed into a flat strip shape. These flat strips are made up of a heat-sealing component composed of a low-melting polymer and a plurality of fiber-forming components composed of a high-melting polymer, respectively. A plurality of fibers are assembled into a fiber assembly, and the fiber assembly has a double structure including a region containing the low-melting polymer and a region not containing the low-melting polymer, and are those areas that do not contain a low melting point polymer is arranged on the surface side of the fiber aggregate, a plurality of fiber-forming components by heat Chakuseibun the vitrification state in these spiral linear member Flat structure strip, characterized in that it is fixed integrally.
(2) The flat aggregate structure according to (1), wherein the fiber assembly includes a composite fiber formed by combining a low-melting-point polymer that is a heat-sealing component and a high-melting-point polymer that is a fiber-forming component. body.
(3) The flat belt-like structure according to (1) or (2), wherein the fibers are continuous fibers.
(4) A method for producing the flat belt-like structure according to (1 ) above, wherein a fiber aggregate constituted by a low-melting polymer and a high-melting polymer is swirled clockwise in a spiral shape. A molded body and a second temporary molded body obtained by rotating a fiber assembly composed of a low-melting-point polymer and a high-melting-point polymer into a spiral shape counterclockwise are prepared, and the fiber assembly of these temporary molded bodies Heat treatment is applied to the body to melt the low melting point polymer, the high melting point polymer is not melted and the fiber form is maintained, and a plurality of fibers made of the high melting point polymer by the heat fusion component made of the low melting point polymer. After the formation components are fixed and integrated to obtain two spiral linear bodies, the loop portions of the two spiral linear bodies are combined with each other, and then subjected to heat treatment in a state of being crushed into a flat band shape. A flat belt characterized by rubbing Method of manufacturing the structure.
(5) A flat band-like structure according to (4) , characterized by using a fiber assembly including a composite fiber obtained by combining a low-melting-point polymer as a heat-sealing component and a high-melting-point polymer as a fiber-forming component. Body manufacturing method.
(6) The method for producing a flat band-shaped structure according to (4) or (5) , wherein a fiber assembly in which the constituent fibers are continuous fibers is used .

  According to the present invention, a flat strip structure having excellent flexibility even if it is made of non-metal because it is composed of a spiral linear body composed of a plurality of fiber-forming components fixedly integrated by a heat-sealing component. Can be obtained. Such a flat belt-like structure can be elastically bent in the width direction and the thickness direction, and has a remarkable effect that it is not easily broken even when a large load is applied.

It is a front view of the flat belt-like structure of the present invention. It is a side view of the flat strip structure of the present invention. It is a perspective view of the spiral linear body which comprises the flat strip | belt-shaped structure of this invention and turns clockwise. It is a perspective view of the spiral linear body which comprises the flat belt-shaped structure of this invention, and turns counterclockwise. It is a front view of the flat beltlike structure of the present invention in which a core material was used. It is a side view of the flat belt-like structure of the present invention using a core material. It is one of the schematic diagrams of the sample which carried out curve deformation in the curvature evaluation to the width direction of the present invention.

Hereinafter, the present invention will be described in detail.
As shown in FIG. 1, the flat band-like structure 1 of the present invention includes a spiral linear body 2 that rotates clockwise and a spiral linear body 3 that rotates counterclockwise having the same pitch. It is formed by combining them alternately in a part. Then, as shown in FIG. 2, the monolith is formed into a flat band shape.

These spiral linear bodies 2 and 3 are each composed of a heat-sealing component made of a low-melting polymer and a plurality of fiber-forming components made of a high-melting polymer. A plurality of fiber-forming components are fixedly integrated by melting the heat-sealing component .

In order to obtain a spiral linear body, a fiber assembly in which a plurality of fibers are converged is used . Such a fiber assembly is composed of a high melting point component and a low melting point component. In the present invention, the reason for using the fiber assembly to obtain the spiral linear body is as follows.

  In other words, a fiber assembly in which a plurality of fibers are simply bundled is flexible and very flexible. Therefore, it can be set as the spiral shape which has various winding diameters and winding pitches. Then, after making such a fiber assembly into a spiral shape, it is subjected to a heat treatment to melt only the low-melting point polymer, and the high-melting point polymer maintains the fiber form, and the heat melting point comprising the low-melting point polymer. By melting the adhering components, the fiber-forming components made of the high melting point polymer are fixed and integrated with each other, so that a spiral shape can be maintained.

  Therefore, even when the fiber assembly itself is thickened in order to improve the strength of the spiral linear body constituting the flat belt-like structure, the flexibility required for winding in a spiral shape is not impaired. . Therefore, it is possible to easily obtain spiral linear bodies of various sizes and pitches by a simple process, and furthermore, by flattening the spiral linear bodies by combining two spiral linear bodies alternately. It can be easily obtained by a simple process. Furthermore, since it is not composed mainly of metal, it is possible to obtain a flat belt-like structure that is lightweight, excellent in weather resistance, and that does not develop an allergic reaction even when it comes into contact with the skin.

  In the present invention, the heat fusion component is a component that is subjected to a heat treatment to melt and solidify, and is a polymer having a low melting point (low melting point polymer). On the other hand, the fiber-forming component is a component that maintains the fiber form and is a polymer (high-melting polymer) having a higher melting point than the low-melting-point polymer.

In the present invention, the fiber assembly may be formed by bundling fibers made only of a low-melting polymer and fibers made only of a high-melting polymer . Or, fiber assembly, it is comprised by focusing a low-melting polymer and composite fibers formed by composing the high melting point polymer, and a fiber comprising only the high-melting polymer which is a heat-sealing component Also good.

The fiber assembly is arranged such that the cross section thereof has a double structure of a region containing a low melting point polymer and a region not containing the low melting point polymer . This fiber assembly is a fiber assembly in which a region not containing a low melting point polymer is arranged on the surface side of the fiber assembly.

That is, the low melting point polymer is not exposed in the fiber assembly whose cross section has a double structure. That is, in the sheath side (surface side) layer, only a high melting point polymer that is not affected by heat due to heat treatment exists, and no low melting point polymer is contained. As a result, the low melting point polymer is not melt-exposed by the heat treatment, so that the low melting point polymer does not adhere to a mold such as a metal shaft for forming a spiral shape, and can be easily removed after the heat treatment and cooling. Can be typed. In addition, for example, in the case of a spiral shape with a small pitch, it is possible to prevent the loop portions between adjacent pitches from being melt-bonded during heat treatment. Further, the surface of the spiral linear body obtained by the heat treatment has a soft texture because it retains the fiber texture without being affected by the heat treatment.

  Specific examples of such a double-layer fiber assembly include air-processed yarn, blended yarn, and covering twisted yarn.

By subjecting the fiber assembly to a heat treatment later, the heat-fusion component composed of the low-melting polymer is melted and then solidified by cooling, so that the fiber-forming components composed of the high-melting polymer are fixed and integrated with each other. it can. Since the fiber-forming component made of the high melting point polymer exists on the surface of the spiral linear body, the strength of the spiral linear body of the flat strip structure, particularly the bending strength, is maintained as the fiber-forming component maintaining the fiber form. Can be improved.

When the region containing the low-melting polymer in the fiber assembly is formed by converging the composite fiber in which the low-melting polymer and the high-melting polymer are combined, the composite fiber has a low melting point weight on the sheath. Examples thereof include a core-sheath type composite fiber in which a polymer is arranged and a high melting point polymer is arranged in the core, and a side-by-side type composite fiber in which a low melting point polymer and a high melting point polymer are arranged in half.

The low melting point polymer in the above-mentioned composite fiber has a role in which after the fiber aggregate is melted by being subjected to a heat treatment, it is solidified by cooling and the fiber forming components composed of the high melting point polymer are fixed and integrated with each other. Is responsible for. On the other hand, the high melting point polymer maintains the fiber form without being melted even if it is subjected to heat treatment, and is present on the surface of the spiral linear body, and a part thereof is present in the melted and solidified low melting point polymer. As a result, the strength, in particular, the bending strength, of the spiral linear body of the flat belt-like structure can be improved.

  If the fiber assembly is composed of only a low-melting polymer, the low-melting polymer melts and flows during heat treatment, and the spiral shape cannot be maintained. Further, if the fiber assembly is composed only of a high-melting polymer that is a fiber-forming component, the fiber-forming component is not fixed and integrated, and the spiral form cannot be maintained. The mixing ratio of the low melting point polymer and the high melting point polymer in the fiber assembly is preferably (low melting point polymer) / (high melting point polymer) = 10/90 to 70/30 in mass ratio. .

  As the low melting point polymer, any polymer having a spinning property by melt spinning may be used. For example, polyester polymer, polyamide polymer, polyolefin polymer, polybutyral polymer, polyacrylic polymer, polyethylene -A vinyl acetate copolymer and a polyurethane polymer are mentioned.

  The melting point of the low melting point polymer is preferably 20 ° C. or more lower than the melting point of the high melting point polymer. By setting such a temperature, even if it is subjected to heat treatment, the physical properties of the high melting point polymer are not affected, and there is an advantage that the spiral form can be maintained well. The melting point of the low-melting polymer is preferably in the range of 80 to 160 ° C. in consideration of processability and various physical properties. When the low melting point polymer does not have a clear melting point, the softening point of the low melting point polymer is regarded as the melting point.

  As the high melting point polymer, from the viewpoint of easy adjustment of the fineness and mechanical properties, any polymer having a thermoplastic polymer as a main component may be used, and two or more kinds of thermoplastic polymers may be combined depending on applications and purposes. May be used.

  Examples of such thermoplastic polymers include polyamide polymers, aromatic polyester polymers, aliphatic polyester polymers, polyolefin polymers, polyurethane polymers, and the like. Among these, a polyamide polymer is preferable from the viewpoint of wear resistance. From the viewpoint of dimensional stability, a polyester polymer is preferable. In addition, when the obtained connecting and fixing member is used for an application that requires natural decomposition after use, an aliphatic polyester polymer having biodegradability is preferable. From the viewpoint of low density and light weight, a polyolefin-based polymer is preferable.

  The preferred combination of low melting point polymer and high melting point polymer is low melting point polyester and high melting point polyester, low melting point polypropylene and high melting point polypropylene, polyethylene and polypropylene, low melting point nylon, considering the compatibility and thermal adhesiveness of both. And high melting point nylon.

  In addition, as said composite fiber, specifically, high melting point polyester with melting | fusing point 240 degreeC or more was distribute | arranged to the core part, and low melting point copolyester with melting | fusing point 110-200 degreeC was distribute | arranged to the sheath part. A core-sheath type composite fiber or a core-sheath type composite fiber in which a high melting point polyamide having a melting point of 180 ° C. or higher is arranged in the core part and a low melting point polyamide having a melting point of 80 to 150 ° C. is arranged in the sheath part is suitably used.

That is, it is preferable that the low melting point polymer (thermal fusion component) and the high melting point polymer (fiber forming component) constituting the spiral linear body are the same type of polymer. This is because the thermal adhesion in a low-melting polymer and a high melting polymer is good, it can be fiber-forming components each other is more firmly fixed integrally. Therefore, in the fiber assembly, it is important to select a component having excellent thermal adhesion and thermal adhesion as a fiber forming component. In addition, if both are the same polymer, there is an advantage that it is preferable from the viewpoint of recycling.

  In the fiber assembly, as long as the effect of the present invention is not impaired, a fiber composed of the above-described low-melting polymer, a fiber composed of a high-melting polymer, or a low-melting polymer and a high-melting polymer Fibers other than the composite fibers made of (for example, natural fibers, regenerated fibers, semi-synthetic fibers, metal fibers, glass fibers, etc.) may be contained.

  The fiber assembly is a collection of fibers. Although the form is not particularly limited, for example, a yarn in which a plurality of fibers are aligned, a twisted yarn in which a plurality of fibers are twisted, a spun yarn, a twisted yarn in which the aligned yarns or twisted yarns are combined, and these And a braid made by using the yarn or a rope obtained by twisting.

  The fineness of the single fiber constituting the fiber assembly is preferably about 3 to 20 dtex, for example, from the viewpoint of flexibility required when the fiber assembly is formed in a spiral shape. Further, the total fineness of the fiber assembly may be, for example, about 5 to 5 million dtex from the viewpoint of flexibility required when the fiber assembly is formed in a coil shape.

  The number of filaments in the fiber assembly is not particularly limited, but is usually 25 to several million filaments.

  Although the form of the fiber which comprises a fiber assembly may be a short fiber or a continuous fiber, it is preferable that it is a continuous fiber. Since continuous fibers do not have fluff, there is an advantage that fluff does not stand on the surface of the obtained flat belt-like structure. Further, the bending strength of the obtained flat band-like structure is improved.

  The cross-sectional shape of the fibers constituting the fiber assembly may be any of a round cross section, a modified cross section, a hollow cross section, and the like. Further, the fibers contained in the fiber assembly may be subjected to processing such as false twisting or taslan processing.

  The cross-sectional shape of the fiber assembly is not particularly limited, and may be any of a round cross section, a modified cross section, a hollow cross section, and the like.

  Additives such as flame retardants, colorants, pigments, lubricants, weathering agents, antioxidants, heat-resistant agents and the like are added to the fibers constituting the fiber assembly, as long as the effects of the present invention are not impaired. It may be contained.

The manufacturing method of the flat strip structure of the present invention is as follows.
A first temporary molded body in which a fiber assembly composed of a low-melting polymer and a high-melting polymer is swirled clockwise in a spiral shape, and a fiber assembly composed of a low-melting polymer and a high-melting polymer Are prepared in a spiral shape in a counterclockwise direction, and a heat treatment is applied to the fiber aggregates of these temporary molded bodies. Then, the low melting point polymer is melted, the high melting point polymer is not melted and the fiber form is maintained, and a plurality of fiber forming components composed of the high melting point polymer are fixed and integrated by the heat fusion component composed of the low melting point polymer. After obtaining two spiral linear bodies, the loop portions of the two spiral linear bodies are combined with each other, and then subjected to heat treatment while being crushed into a flat band shape.

  That is, the fiber assembly as described above is spirally wound clockwise and counterclockwise so as to have a predetermined spiral shape, thereby obtaining a first temporary molded body and a second temporary molded body. The fiber aggregates of these temporary molded bodies are subjected to heat treatment at a temperature at which the low melting point polymer is melted and the high melting point polymer is not melted, and then cooled and solidified. Thereby, a plurality of fiber forming components (high melting point components) in the fiber assembly are fixed and integrated by the heat-sealing component (low melting point polymer) that has been cooled and solidified to form a spiral linear body.

  Then, as shown in FIG. 3 and FIG. 4, two types of linear bodies are produced: a spiral linear body 2 that rotates clockwise with the same pitch, and a spiral linear body 3 that rotates counterclockwise. To do. The strips of the present invention as shown in FIG. 1 and FIG. 2 are formed by alternately combining them in each loop-shaped portion and applying heat treatment in a state where the strips are crushed into flat strips. A structure can be obtained.

  In obtaining a temporary molded body by winding the fiber assembly in a spiral shape, a predetermined shaping shaft may be used. In the present invention, since a fiber assembly is used, there is flexibility between the fibers constituting the fiber assembly. Therefore, the fiber assembly is excellent in flexibility and can cope with any shape. Therefore, in order to obtain a desired flat band-like structure according to the application, the diameter of the shaping shaft, the pitch of the spiral shape, the cross-sectional shape of the shaping shaft, etc. can be adjusted as appropriate. A band-shaped structure can be obtained. As a result, it is possible to easily obtain a flat belt-like structure having a desired strength and having a size and a pitch according to the application.

  A heating method for applying heat treatment to the fiber assembly of the temporary molded body wound in a spiral shape is not particularly limited, but a well-known means such as an iron, a hot air welder, a hot air dryer, a tenter machine, or the like may be used. it can. The heat treatment temperature may be appropriately set according to the heat treatment time and the like, and is set to a temperature not lower than the melting point of the high melting point polymer and not lower than the melting point of the low melting point polymer.

  Next, by cooling after the heat treatment, the molten low-melting point polymer is solidified and integrated, and the fiber assembly becomes a rigid spiral linear body. A spiral linear body is obtained by this heat treatment. As the cooling means, known means such as air cooling and water cooling can be used.

  In addition, as a method of obtaining a spiral linear body having a desired pitch, it may be formed by winding it around a shaping shaft at a desired pitch, or it may be formed by winding at a pitch shorter than the desired pitch. It is also possible to obtain a spiral linear body having a desired pitch by extending the pitch by applying a heat treatment in a state where a load is applied. At this time, the load is preferably not less than the shrinkage stress and not more than the breaking stress of the fiber assembly at the heat treatment temperature.

  Then, the spiral linear bodies 2 and 3 are alternately combined in each loop-shaped portion to form a single strip, and the flat strip structure of the present invention is flattened by applying a heat treatment in a state where a load is applied to the single strip. You can get a body. Alternatively, the flat strip structure 2 of the present invention can be obtained by combining the spiral linear bodies 2 and 3 without combining the spiral linear bodies 2 and 3 and applying a heat treatment to flatten them. As a heat treatment method in a state where a load is applied, well-known means such as an iron, a hot air welding machine, a hot air dryer, a tenter machine, etc., mentioned as the heat treatment means for obtaining the spiral linear body may be used. Moreover, according to the heat treatment means such as a high-frequency welder, a hot press, a hot roll press, etc., since both the heating means and the pressurizing means are provided, it can be preferably used.

  The heat treatment temperature at the time of flattening can be appropriately set depending on the balance with the heat treatment time, but is usually set to a level not exceeding the melting point of the high melting point polymer. The load for flattening can be set as appropriate depending on the size of the spiral linear body, heat treatment conditions, and the like, but it is usually preferable to set the load within the range of the breaking stress of the spiral linear body.

  When the heat treatment temperature during flattening is equal to or higher than the melting point of the low-melting polymer, the fiber polymer surface from the viewpoint of improving the flexibility in the width direction and the thickness direction due to adhesion between the spiral linear bodies It is preferable to arrange a fiber (high melting point polymer) that can maintain a fiber form without being melted by heat treatment at least in part.

  Furthermore, for the purpose of improving flexibility and strength, as shown in FIGS. 5 and 6, a core member 4 made of a linear body may be inserted in the length direction of the flat band-shaped structure of the present invention. The material of the linear body which comprises a core material is not specifically limited, The rod-shaped body which consists of synthetic resins, a monofilament, a metal wire etc. are mentioned. Moreover, you may use the linear body obtained by melting a low melting-point polymer by performing heat processing with the linear form with respect to the fiber assembly in this invention as a core material. In addition, what is necessary is just to select suitably according to the objective also about the size of a core material, the number, and cross-sectional shape.

  When the core material is used, the core material may be inserted into the monolith before being flattened, and may be flattened in a state in which the monolith and the core material are integrated. A core material may be inserted through a flat belt-like structure obtained by flattening.

  Furthermore, the flat belt-like structure of the present invention may be covered with various resins and cylindrical bodies for the purpose of reinforcement and the like. Such a resin is not particularly limited, but a resin similar to the fiber constituting the fiber assembly is preferable from the viewpoints of adhesiveness to the flat band structure and recyclability. The tubular body is not particularly limited, and examples thereof include a tubular knitted fabric made of fibers, a round string, or a tubular woven fabric. You may make it adhere | attach on the outer side of a flat belt-like structure.

  In addition, a corner may exist at the tip of the spiral linear body constituting the flat band-shaped structure of the present invention, but a cover is attached to this corner for the purpose of improving safety or reinforcing. May be. The material and shape of the cover are not particularly limited, but when used for touching the body, the cover can be safely used as long as it is a soft material and has no corners.

  When the cover as described above is not used, it can be used safely by crushing the corner of the tip portion of the flat band-like structure by an appropriate means and eliminating the corner.

  Since the flat band-like structure of the present invention does not use a metal in the part that directly touches the skin, it is lightweight, prevents the development of metal allergy, and has excellent flexibility. For this reason, it is suitably used in correction underwear, indirect portions of artificial hands and artificial legs.

  Next, the present invention will be specifically described based on Examples and Comparative Examples, but the present invention is not limited to these Examples.

In addition, the evaluation method in an Example and a comparative example is as follows.
(1) Non-metallicity The samples obtained in Examples and Comparative Examples were evaluated according to the following criteria.
○: The sample does not contain a metal material.
X: The sample contains a metal material.

(2) Curvature in the width direction The sample 5 obtained in the example and the comparative example is placed on a plane, and both ends of the sample 5 are separated from the reference line 6 as shown in FIGS. It was curved in the width direction (direction perpendicular to the longitudinal direction of the sample). Then, in the curved sample 5, the angle 8 formed by the outer tangent line 7 and the reference line 6 at the end of the sample when the surface of the sample cannot be maintained in the same plane state and is twisted or warped. Was measured. Evaluation was made according to the following criteria.
A: The size of the angle 8 at the time of twisting or warping in the sample 5 exceeds 90 degrees.
(Triangle | delta): The magnitude | size of the angle 8 in the time of the twist and curvature generate | occur | produced in the sample 5 is 45 to 90 degree | times.
X: The magnitude | size of the angle 8 in the time of a twist and curvature generate | occur | producing in the sample 5 is less than 45 degree | times.
7A shows the sample when the angle 8 is less than 90 degrees, FIG. 7B shows the sample when the angle 8 is 90 degrees, and FIG. 7C shows the sample. A sample is shown when the angle 8 is less than 90 degrees.

(3) Curving in the thickness direction Both ends of the samples obtained in the examples and comparative examples were grasped with both hands, bent 90 degrees in the thickness direction, and evaluated according to the following criteria.
○: The sample did not break.
X: The sample broke.

Example 1
First, a fiber assembly was produced.
Polyethylene terephthalate (melting point: 260 ° C.) is arranged in the core part, and ethylene terephthalate and butylene terephthalate are arranged in the sheath part to alkylene terephthalate having a molar ratio of 1: 1, and ε-caprolactone is added to the whole monomer. A composite in which a copolymerized polyester (melting point: 161 ° C.) copolymerized with 12 mol% is provided and the mass ratio of the core part to the sheath part is (core part) / (sheath part) = 2.7 / 1 Fiber was obtained. And the multifilament a (560dtex / 48f) which consists of this composite fiber was obtained. Using this multifilament a, stringing was performed with eight corners, and a braid A having a diameter (0.6) mm was obtained, which was used as the central portion of the fiber assembly. Subsequently, eight multifilaments b (560 dtex / 96 f) made of polyethylene terephthalate were arranged on the outer periphery of the braid A to obtain a fiber assembly (outer diameter: 1.1 mm) made of a double braid. .

  This fiber assembly is wound clockwise around a metal shaft (stainless steel, diameter: 11 mm) without providing a gap between adjacent braids (that is, fiber assembly) to form a spiral shape. Heat treatment was performed at 180 ° C. for 10 minutes using a dry heat oven. Subsequently, after air-cooling for 30 minutes, it removed from the axis | shaft and obtained the spiral linear body. Furthermore, another spiral linear body was obtained in the same manner as described above except that it was wound counterclockwise.

  Next, a tensile load of 100 gf was applied to each of the above-described two types of spiral linear bodies swirled in opposite directions, and in this state, a heat treatment was performed at 100 ° C. for 10 minutes using a dry heat oven, followed by air cooling. The pitch was increased to 4 mm.

  These two types of spiral linear bodies were combined in an alternating manner in their loop-shaped portions to form a single line. Then, the single product was crushed in the width direction by applying a load of 10 kgf (98 N), and in this state, heat treatment was performed at 180 ° C. for 30 minutes using a dry heat oven. Thereafter, it was air-cooled to obtain a flat band-like structure (width: 9 mm, length: 200 mm, thickness: 2.7 mm) as shown in FIG. Evaluation was performed using this flat belt-like structure. The evaluation results are shown in Table 1.

(Comparative Example 1)
Evaluation was performed using a commercially available metal core (width 6 mm, length 200 mm, thickness 1.5 mm) as Comparative Example 1. In this metallic core material, two stainless steel wires having a diameter of about 0.75 mm, which are flattened by crushing a coil made of a spiral, were combined so that the directions of rotation of the spirals were opposite to each other. Coil bone. The evaluation results are shown in Table 1.

(Comparative Example 2)
Evaluation was performed using a commercially available film bone made of a thermoplastic synthetic resin (core material used for correction underwear) (width 5 mm, length 200 mm, thickness: 0.5 mm). The evaluation results are shown in Table 1.

  As is clear from Table 1, the flat band-like structure of the present invention obtained in Example 1 is made of a non-metallic material, so it is lightweight and does not cause metal allergy even when touched directly on the skin. there were. In addition, the horizontal state is maintained even when bent even though the thickness and width are large compared to the film core made of the metal core material or thermoplastic synthetic resin of the comparative example, and the occurrence of twist As shown in FIG. 7 (c), the angle at the time of evaluation far exceeded 90 degrees, and no warp or the like occurred even when both ends crossed. Further, it was able to withstand breakage even when curved. Therefore, it is suitably used for applications such as a core material for correction underwear and parts for artificial legs.

  In particular, the flat belt-like structure obtained in Example 1 was soft with the fibers on its surface not melted and leaving the texture of the fibers.

  Since the core material of Comparative Example 1 is made of metal, it is inferior in lightness, and there is a risk that metal allergy will be manifested when touching the skin directly. Furthermore, in the width direction, there is a risk of damage when a large load is applied.

  When the core material of Comparative Example 2 was bent in the width direction, twisting and warping occurred. Therefore, when applied to uses such as a core material for corrective underwear or a prosthetic leg component, it cannot follow the body movement and may be easily damaged when a load is applied.

DESCRIPTION OF SYMBOLS 1 Flat belt-like structure 2 Spiral linear body swirling clockwise 3 Spiral linear body swirling counterclockwise Core 5 consisting of a linear body Sample 6 Reference line 7 Outer tangent line 8 of sample end The angle formed by the edge tangent and the reference line

Claims (6)

A spiral linear body swirling clockwise having the same pitch and a spiral linear body swirling counterclockwise are combined in an alternating manner in each loop-shaped portion, and the strip is flattened. Each of the spiral linear bodies is composed of a heat-sealing component composed of a low-melting polymer and a plurality of fiber-forming components composed of a high-melting polymer, The fiber assembly is composed of a fiber assembly, and the fiber assembly has a double structure in which the region containing the low-melting polymer and the region not containing the low-melting polymer have a low melting point. are those regions containing no polymer disposed on the surface portion of the fiber assembly, fixing a plurality of fiber-forming components by heat Chakuseibun the vitrification state in these spiral linear member Flat structure strip, characterized in that it is embodied. 2. The flat belt-like structure according to claim 1, wherein the fiber assembly includes a composite fiber obtained by combining a low-melting polymer as a heat-fusion component and a high-melting polymer as a fiber-forming component. . The flat band-like structure according to claim 1 or 2, wherein the fibers are continuous fibers. It is a method of manufacturing the flat band-shaped structure of Claim 1 , Comprising: The 1st temporary molded object which swirled the fiber assembly comprised by a low melting-point polymer and a high melting-point polymer to spiral shape clockwise. And a second temporary molded body obtained by rotating a fiber assembly composed of the low-melting polymer and the high-melting polymer in a spiral shape in a counterclockwise direction. A plurality of fiber-forming components composed of a high-melting polymer by a heat-sealing component composed of a low-melting polymer, each of which is subjected to heat treatment to melt the low-melting-point polymer and maintain the fiber form without melting the high-melting-point polymer. After fixing and integrating the two spiral linear bodies, the loop portions of the two spiral linear bodies are combined with each other, and then subjected to heat treatment in a state where they are crushed into a flat band shape. A flat strip characterized by The method for manufacturing brightness-enhancing body. 5. A flat band-like structure according to claim 4 , wherein a fiber assembly comprising a composite fiber obtained by combining a low melting point polymer as a heat-sealing component and a high melting point polymer as a fiber forming component is used. Manufacturing method. 6. The method for producing a flat band-like structure according to claim 4 or 5 , wherein a fiber assembly in which the constituent fibers are continuous fibers is used .

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