JP2014054805A - Method for producing coil from synthetic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for obtaining a coil which is made from a synthetic resin and is made to have an optional pitch or optional initial tension although a fixed shaping shaft is used.SOLUTION: A method for producing the coil, which is made from the synthetic resin and has the pitch wider than that of a metallic screw to be used as the shaping shaft, comprises: a step (A) of applying a Z twist to a multifilament yarn 1 obtained by bundling core-sheath conjugate fibers each having a low melting point polymer as a sheath component and a high melting point polymer as a core component; a step (B) of winding the Z twist-applied multifilament yarn 1 spirally along the pitch of the Z-twisted metallic screw while keeping a Z-twisted state of the multifilament yarn 1; a step (C) of heat-treating the multifilament yarn 1 wound around the metallic screw so that only the sheath component is softened or melted, the adjacent core-sheath conjugate fibers are welded to each other and a synthetic resin-made coil line is obtained from the multifilament yarn 1; and a step (D) of removing the synthetic resin-made coil line from the metallic screw to obtain the synthetic resin-made coil.

Description

  The present invention relates to a method for producing a synthetic resin coil using twisted multifilament yarn.

  Conventionally, various synthetic resin coils have been proposed instead of metal coils because they are easily rusted, have poor durability, cannot be colored, and are heavy. The applicant of the present application has also proposed a synthetic resin coil obtained by using a fiber bundle formed of a low-melting polymer and a high-melting polymer (Patent Document 1).

  Specifically, the synthetic resin coil manufacturing method described in Patent Document 1 is as follows. First, a core-sheath type composite fiber having a low melting point polymer as a sheath component and a high melting point polymer as a core component is prepared. A plurality of the core-sheath composite fibers are bundled to obtain a multifilament yarn that is a fiber bundle. A braid is obtained by braiding using this multifilament yarn. The braid is wound around the shaping shaft and heat treated to soften or melt the low melting point polymer to fuse the core-sheath type composite fibers together, and the braid is made of a synthetic resin coil wire. Thereafter, the synthetic resin coil wire wound around the shaping shaft is removed to obtain a synthetic resin coil.

Japanese Patent Application No. 2011-175984

  The inventor has conducted various experiments using the synthetic resin coil manufacturing method described in Patent Document 1. However, when a multifilament yarn twisted in a specific direction is swung in a specific direction and wound around a shaping shaft, the pitch of the resultant synthetic resin coil is found to be narrower or wider. Based on this discovery, it was found that the pitch of the synthetic resin coil obtained by removing from the shaping shaft can be arbitrarily changed even if the pitch when wound around the shaping shaft is constant. Accordingly, an object of the present invention is to provide a method of obtaining a synthetic resin coil having an arbitrary pitch while using a fixed shaping shaft.

  It was also found that the initial tension increases when the coil wires are in close contact with each other and the pitch does not become narrower. Accordingly, an object of the present invention is to provide a method for obtaining a synthetic resin coil having an arbitrary initial tension.

  That is, the present invention includes a step of Z-twisting a multifilament yarn obtained by bundling core-sheath composite fibers having a low-melting polymer as a sheath component and a high-melting polymer as a core component, A step of spirally winding the multifilament yarn around the shaping shaft at a predetermined pitch in a state of holding the twist, and applying heat treatment in a state where the multifilament yarn is wound around the shaping shaft; Only the components are softened or melted, the core-sheath composite fibers are fused together, and the multifilament yarn is made into a synthetic resin coil wire, and the synthetic resin coil wire is removed from the shaping shaft The present invention relates to a method for producing a synthetic resin coil having a pitch wider than the predetermined pitch, including a step of obtaining a synthetic resin coil. Further, in the above method, the present invention relates to a method of manufacturing a synthetic resin coil having a pitch smaller than a predetermined pitch by winding spirally with S winding instead of spirally winding with Z winding. It is.

  Furthermore, the present invention includes a step of applying S twist to a multifilament yarn obtained by bundling a core-sheath composite fiber having a low melting point polymer as a sheath component and a high melting point polymer as a core component, A step of winding the multifilament yarn in a spiral shape with a predetermined pitch on the shaping shaft in a state of keeping the twist, a heat treatment in a state where the multifilament yarn is wound around the shaping shaft, Only the components are softened or melted, the core-sheath composite fibers are fused together, and the multifilament yarn is made into a synthetic resin coil wire, and the synthetic resin coil wire is removed from the shaping shaft The present invention relates to a method for producing a synthetic resin coil having a pitch wider than the predetermined pitch, including a step of obtaining a synthetic resin coil. Further, in the above method, the present invention relates to a method of manufacturing a synthetic resin coil having a pitch smaller than a predetermined pitch by winding in a spiral manner with a Z winding instead of spirally winding with an S winding. It is.

  The core-sheath type composite fiber used in the present invention has a low melting point polymer as a sheath component and a high melting point polymer as a core component. The low melting point polymer is preferably one that softens or melts at about 80 to 160 ° C. The high melting point polymer is one that does not soften or melt at a temperature at which the low melting point polymer softens or melts, and preferably has a softening point difference or a melting point difference of 20 ° C. or higher. Preferred combinations of the low melting point polymer and the high melting point polymer include low melting point polyester / high melting point polyester, low melting point polypropylene / high melting point polypropylene, polyethylene / polypropylene, low melting point nylon / high melting point nylon and the like. The core-sheath type composite fiber is used in the form of a long fiber, and a plurality of the bundles are bundled to form a multifilament yarn. The multifilament yarn may be one obtained by bundling a plurality of long fibers, or may be obtained by bundling a plurality of multifilament yarns obtained by bundling a plurality of long fibers.

  The multifilament yarn is Z-twisted or S-twisted. Here, the Z twist is a twist in which the fibers in the multifilament yarn 1 travel from the upper right to the lower left as shown in FIG. This Z-twisting can be performed by, for example, a ring twisting machine, and is obtained by turning the ring through which the multifilament yarn has passed to the right (turning clockwise). On the other hand, the S twist is a twist in which the fibers in the multifilament yarn 1 run from the upper left to the lower right as shown in FIG. This S twist can also be applied by a ring twisting machine, and is obtained by turning the ring through which the multifilament yarn passes counterclockwise (turning counterclockwise). In addition, when Z-twisting or S-twisting is applied to the multifilament yarn, the surface of the multifilament yarn is covered with a filament yarn composed of a polymer having a higher melting point than the low melting point polymer in the core-sheath composite fiber. May be. Specifically, when a core-sheath type composite fiber composed of a combination of a low melting point polyester and a high melting point polyester is used, the multifilament yarn is covered with a polyester filament yarn composed of a high melting point polyester. By covering with such filament yarn, it is possible to prevent fusion of the multifilament yarn wound spirally or between the multifilament yarn and the shaping shaft in the subsequent heat treatment step.

  If both ends of the multifilament yarn subjected to Z twist or S twist are left untwisted, the twist may be released. In other words, if the multifilament yarn that has been twisted is left unattended, the Z twist will work in the S twist direction and try to release the twist, and the S twist will work in the Z twist direction and try to release the twist And Moreover, this force becomes stronger as the number of twists increases. For this reason, the both ends of the multifilament yarn or appropriate portions are bound so that the twist is not released. That is, it is set as the state which maintained Z twist or S twist. And it winds around a shaping axis | shaft helically.

  There are also Z winding and S winding when the multifilament yarn is wound spirally around the shaping shaft. The Z winding is a winding method in which the multifilament yarn 1 travels from the upper right to the lower left of the shaping shaft 2 as shown in FIG. Such Z winding is obtained by winding the multifilament yarn 1 spirally around the shaping shaft 2 while turning right (turning clockwise). On the other hand, S winding is a winding method in which the multifilament yarn 1 travels from the upper left to the lower right of the shaping shaft 2 as shown in FIG. Such S winding is obtained by winding the multifilament yarn 1 spirally around the shaping shaft 2 while turning left (turning counterclockwise). In addition, as the shaping shaft 2, it is preferable to use a portion where the multifilament yarn 1 is wound in advance as a recess, and specifically, a screw is preferably used. Moreover, since the shaping shaft 2 is heated by heat treatment, a heat-resistant material is preferable, and generally a metal screw is most preferable.

  Heat treatment is performed with the multifilament yarn wound around the shaping shaft. The heat treatment condition is a temperature at which only the low-melting polymer that is the sheath component of the core-sheath composite fiber is softened or melted. That is, the high melting point polymer that is the core component retains the original fiber form, and only the low melting point polymer that is the sheath component is softened or melted. As a result, the core-sheath type composite fibers in the multifilament yarn are fused together to obtain a synthetic resin coil wire in which the entire multifilament yarn is integrated. And in this synthetic resin coil wire, a high melting point polymer exists in the state which maintained the original fiber form. Thereafter, the synthetic resin coil wire can be cooled and removed from the shaping shaft to obtain a synthetic resin coil.

[Action]
The invention according to claim 1 is to obtain a Z-coiled synthetic resin coil by winding a Z-twisted multifilament yarn in a spiral manner with Z-winding around a shaping shaft. In the coil wire of the synthetic resin coil, there is a high melting point polymer that retains the original fiber form. That is, Z-twisted high melting point polymer fibers are present. Since the high-melting polymer fiber is Z-twisted, a force is applied in the direction of potentially releasing the twist, that is, in the S-twist direction. The force in the S twist direction is a force applied in the left turning direction because the S twist is a twist caused by turning the multifilament yarn counterclockwise (turning counterclockwise). Accordingly, a force is applied to the Z-turn synthetic resin coil wound in the right turn direction in the left turn direction, which is the reverse direction, and the synthetic resin coil removed from the shaping shaft This load is developed, and the pitch of the Z-wound synthetic resin coil becomes wider.

  According to a second aspect of the present invention, a Z-twisted multifilament yarn is spirally wound with S winding around a shaping shaft to obtain an S-winding synthetic resin coil. Also in this case, in the synthetic resin coil wire, there is a high melting point polymer that retains the original fiber form. Therefore, as in the case of the invention according to claim 1, a force is potentially applied in the S twist direction. The force in the S twist direction is a force applied in the left turning direction as described above. Therefore, a force is applied to the S-turn synthetic resin coil wound in the left turn direction in the left turn direction, which is the same direction, and the synthetic resin coil removed from the shaping shaft has This load develops and the pitch of the S-wrapped synthetic resin coil becomes narrower.

  According to a third aspect of the invention, an S-twisted multifilament yarn is spirally wound around the shaping shaft by S winding to obtain an S-winding synthetic resin coil. In the coil wire of this synthetic resin coil, S-twisted high melting point polymer fibers are present, and a force is potentially loaded in the Z twist direction. The force in the Z twist direction is a force applied in the right turning direction. Therefore, a force is applied to the S winding wound in the left turn direction in the right turn direction, which is the reverse direction, and this load is generated in the synthetic resin coil removed from the shaping shaft. In addition, the pitch of the S-wrapped synthetic resin coil becomes wider.

  According to a fourth aspect of the present invention, an S-twisted multifilament yarn is spirally wound with Z winding around a shaping shaft to obtain a Z-winding synthetic resin coil. In the coil wire of this synthetic resin coil, S-twisted high melting point polymer fibers are present, and a force is potentially loaded in the Z twist direction. The force in the Z twist direction is a force applied in the right turning direction. Therefore, a force is applied to the Z winding wound in the right turning direction in the right turning direction, which is the same direction, and this load is applied to the synthetic resin coil removed from the shaping shaft. It appears, and the pitch of the S-winding synthetic resin coil becomes narrower.

  The pitch of the synthetic resin coil can be adjusted by appropriately determining the number of twists. That is, since the force for releasing the twist is a source of the force applied in the potential S twist direction or the Z twist direction, this force becomes stronger as the number of twists is increased. That is, the greater the number of twists, the stronger the twist, and the stronger the force to release this twist. Therefore, as the number of twists is increased, a synthetic resin coil having a wider or narrower pitch can be obtained.

  In the case of a coil in which the synthetic resin coil wires of the obtained coil are in close contact with each other and the pitch cannot be further reduced, the coil wires are separated when a load is applied to the coil. It is also possible to adjust the strength of the initial tension, that is, the strength at which the coil starts to change in the load direction (initial tension). That is, as the number of twists is increased, a synthetic resin coil having a high initial tension can be obtained.

  If the method according to the present invention is employed, it is possible to obtain a synthetic resin coil having an arbitrary pitch while using a fixed shaping shaft, as is apparent from the description of the above operation. Moreover, an effect is obtained that a synthetic resin coil having an arbitrary initial tension can be obtained.

  EXAMPLES Hereinafter, although this invention is demonstrated concretely based on an Example, this invention is not limited to these Examples. In the present invention, if a Z-twisted or S-twisted multifilament yarn is wound on a shaping shaft in a Z-winding or S-winding to obtain a synthetic resin coil, the pitch when wound on the shaping shaft is widened. It can be interpreted as being based on the knowledge that a synthetic resin coil having an arbitrary pitch or an arbitrary initial tension can be obtained, or the initial tension of the coil can be increased or decreased. It should be.

Example 1
A copolymer polyester having a melting point of 161 ° C. was prepared as a low melting point polymer, and polyethylene terephthalate having a melting point of 260 ° C. was prepared as a high melting point polymer. Then, by a composite melt spinning method, a core-sheath type composite long fiber having a fineness of about 11 dtex, in which a low melting point polymer was constituted by a sheath component and a high melting point polymer was constituted by a core component, was obtained. The mass ratio of the sheath component to the core component was sheath component: core component = 1: 2.7. 96 core-sheath composite long fibers were bundled to obtain a multifilament of 1100 dtex / 96 filaments. Further, eight multifilaments were bundled to obtain 8800 dtex / 768 multifilament yarns. The multifilament yarn was hung on a ring twisting machine and Z-twisted at a twist count of 40 times / m. The diameter of the multifilament yarn subjected to Z twisting was 1.0 mm.

  Both ends of the multifilament yarn were tied and wound in a spiral shape along the concave portion of the metal screw while maintaining the Z twist. The concave portion of the metal screw was Z-wound, and the pitch was 1.8 mm. Therefore, the multifilament yarn was wound in a Z winding with a pitch of 1.8 mm. While maintaining this state, the hot air treatment was performed at 180 ° C. for 10 minutes, followed by air cooling. As a result, the sheath component of the core-sheath type composite long fiber in the multifilament yarn was softened or melted and fused, resulting in a synthetic resin coil wire in which the core-sheath type composite long fiber in the multifilament was integrated. Thereafter, the synthetic resin coil wire was removed from the metal screw to obtain a synthetic resin coil.

  The pitch of the obtained synthetic resin coil was 4.5 mm, which was 2.7 mm wider than the pitch when wound around the metal screw. The synthetic resin coil had an inner diameter of 9.5 mm and a spring constant of 0.011 N / mm.

Example 2
A synthetic resin coil was obtained in the same manner as in Example 1 except that the number of twists of the multifilament yarn was increased to 80 times / m. The pitch of the obtained synthetic resin coil was 5.5 mm, which was 3.7 mm wider than the pitch when wound around the metal screw. Further, since the number of twists is increased as compared with the first embodiment, the width of the pitch is wider than that of the first embodiment. The synthetic resin coil had an inner diameter of 9.4 mm and a spring constant of 0.014 N / mm.

Example 3
A synthetic resin coil was obtained in the same manner as in Example 1 except that the number of twists of the multifilament yarn was increased to 160 times / m. The pitch of the obtained synthetic resin coil was 7.4 mm, which was 5.6 mm wider than the pitch when wound around the metal screw. In addition, since the number of twists is increased as compared with the second embodiment, the pitch is wider than that of the second embodiment. The synthetic resin coil had an inner diameter of 9.4 mm and a spring constant of 0.023 N / mm.

Example 4
A synthetic resin coil was obtained in the same manner as in Example 1, except that the Z-twist was applied 40 times / m to the multifilament yarn, except that the S-twist was applied 40 times / m. The pitch of the obtained synthetic resin coil was 1.0 mm, which was 0.8 mm narrower than the pitch when wound around the metal screw. The pitch of the synthetic resin coil was the same as the diameter of the coil wire, and the coil wires were in close contact with each other. The initial tension of the synthetic resin coil was 0.010N. The synthetic resin coil had an inner diameter of 9.6 mm and a spring constant of 0.012 N / mm.

Example 5
A synthetic resin coil was obtained in the same manner as in Example 4 except that the number of twists of S twist was increased to 80 times / m. As in the case of Example 4, the pitch of the obtained synthetic resin coil was the same as the diameter of the coil wire, and the coil wires were in close contact with each other. The initial tension of the synthetic resin coil is 0.066 N, which is higher than the initial tension of the coil obtained in Example 4. This is because the number of twists in Example 5 is larger than the number of twists in Example 4. The synthetic resin coil had an inner diameter of 9.6 mm and a spring constant of 0.012 N / mm.

Example 6
A synthetic resin coil was obtained in the same manner as in Example 4 except that the number of twists of S twist was increased to 160 times / m. As in the case of Example 4, the pitch of the obtained synthetic resin coil was the same as the diameter of the coil wire, and the coil wires were in close contact with each other. The initial tension of the synthetic resin coil is 0.20 N, which is higher than the initial tension of the coils obtained in Examples 4 and 4. This is because the number of twists in Example 6 is greater than the number of twists in Examples 4 and 5. The synthetic resin coil had an inner diameter of 9.6 mm and a spring constant of 0.017 N / mm.

It is the front view which showed the specific example of Z twist. It is the front view which showed the specific example of S twist. It is the front view which showed the specific example of Z winding. It is the front view which showed the specific example of S winding.

1 Multifilament yarn 2 Shaping shaft

Claims (7)

A step of Z-twisting a multifilament yarn obtained by bundling a core-sheath type composite fiber having a low melting point polymer as a sheath component and a high melting point polymer as a core component;
A step of spirally winding the multifilament yarn with Z winding at a predetermined pitch on a shaping shaft in a state where the multifilament yarn is held in a Z twist;
Heat treatment is performed with the multifilament yarn wound around the shaping shaft, only the sheath component is softened or melted, and the core-sheath type composite fibers are fused together, and the multifilament yarn is made of synthetic resin. Including a step of obtaining a coil wire, and a step of removing the synthetic resin coil wire from a shaping shaft to obtain a synthetic resin coil.
A method of manufacturing a synthetic resin coil having a pitch wider than the predetermined pitch. A step of Z-twisting a multifilament yarn obtained by bundling a core-sheath type composite fiber having a low melting point polymer as a sheath component and a high melting point polymer as a core component;
A step of spirally winding the multifilament yarn with S winding at a predetermined pitch around the shaping shaft in a state in which the multifilament yarn is held in the Z twist;
Heat treatment is performed with the multifilament yarn wound around the shaping shaft, only the sheath component is softened or melted, and the core-sheath type composite fibers are fused together, and the multifilament yarn is made of synthetic resin. Including a step of obtaining a coil wire, and a step of removing the synthetic resin coil wire from a shaping shaft to obtain a synthetic resin coil.
A method for producing a synthetic resin coil having a narrower pitch than the predetermined pitch. A step of applying S twist to a multifilament yarn obtained by bundling a core-sheath type composite fiber having a low melting point polymer as a sheath component and a high melting point polymer as a core component;
A step of spirally winding the multifilament yarn with S winding at a predetermined pitch around a shaping shaft in a state where the S strand is held in the multifilament yarn;
Heat treatment is performed with the multifilament yarn wound around the shaping shaft, only the sheath component is softened or melted, and the core-sheath type composite fibers are fused together, and the multifilament yarn is made of synthetic resin. Including a step of obtaining a coil wire, and a step of removing the synthetic resin coil wire from a shaping shaft to obtain a synthetic resin coil.
A method of manufacturing a synthetic resin coil having a pitch wider than the predetermined pitch. A step of applying S twist to a multifilament yarn obtained by bundling a core-sheath type composite fiber having a low melting point polymer as a sheath component and a high melting point polymer as a core component;
A step of spirally winding the multifilament yarn by Z winding at a predetermined pitch around the shaping shaft while holding the S twist on the multifilament yarn;
Heat treatment is performed with the multifilament yarn wound around the shaping shaft, only the sheath component is softened or melted, and the core-sheath type composite fibers are fused together, and the multifilament yarn is made of synthetic resin. Including a step of obtaining a coil wire, and a step of removing the synthetic resin coil wire from a shaping shaft to obtain a synthetic resin coil.
A method for producing a synthetic resin coil having a narrower pitch than the predetermined pitch.   The method for producing a synthetic resin coil according to any one of claims 1 to 4, wherein the multifilament yarn is a bundle of a plurality of multifilament yarns.   The multifilament yarn is coated with a filament yarn composed of a polymer having a melting point higher than that of the low-melting-point polymer when the Z-strand or S-twist is applied to the multifilament yarn. A method for producing the described synthetic resin coil.   A synthetic resin coil obtained by the method according to claim 1.

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