JP2005146453A - Method for joining strand constituting woven fabric - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for joining a strand constituting a woven fabric, enabling the strand to be repaired after weaving the strand-broken fabric while keeping the surface of the woven fabric smooth. <P>SOLUTION: The method comprises the following practice: two cut end sides 2a and 2b of the broken strand 4 are drawn out respectively, and torn nearly at the center in the cross direction along the longitudinal direction of the strand 4 respectively, and each one-side half of the two cut end sides thus torn is cut off, wherein the two one-side halves are symmetric to each other based on the longitudinal direction of the strand, and the resultant strand is knitted in in such a condition that both of the torn faces 6a and 6b are butted on each other and returned into the texture of the woven fabric. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for connecting strands (yarns) constituting a fabric in which yarn breakage occurs during weaving.

  When weaving a strand in which a plurality of filaments (multifilaments) are bundled, the resulting woven fabric usually has a width of 0.3 to 1.6 m, whereas the length is 30 to 100 m and the warp direction. Long in the (longitudinal direction). Further, when weaving, since the fabric is easily stressed in the warp yarn direction, the warp yarn is likely to be cut (yarn breakage). Thus, when handling a fabric in which yarn breakage occurs during weaving, it is necessary to repair the warped warp yarn.

  As a conventional method for connecting yarns, it is not as a repair after weaving yarn breaks, but as a method for connecting weft yarns before weaving, simply joining the yarns, overlapping the yarns, and melting the overlapping sections However, Patent Document 1 discloses a method of connecting a thread and a thread by applying pressure.

  However, when trying to apply the method disclosed in Patent Document 1 for strands in which yarn breakage occurred during weaving, the apparent width of the knot is 3 to 4 times that of the yarn in the former method of simply joining yarns, Further, the end of the yarn is necessary, and the length is about 10 mm or more from end to end. Therefore, the stitched portion of the yarn becomes noticeable in the fabric structure, and the surface of the fabric is not smooth.

In the latter method in which the yarns are superposed, melted in a short section, and pressure is applied to connect the yarns to each other, only strands of a material that can be thermally melted can be used. In addition, since the welding mechanism is used, in order to connect and repair the broken strands, the ends of the broken yarns are pulled out for a long time, and then the yarns are overlapped with each other to melt and melt the overlapped sections. Multiply the thread and thread. After the connection, the end portion of the drawn yarn must be returned to the fabric structure, but the drawn portion is so long that it is difficult to return it to the fabric structure.
JP 2000-314043 A (claim, paragraph numbers [0002] to [0003])

  While the present inventor has been variously examining the above problems, the ends of the broken strands are pulled out, the half in the width direction is torn, the half on one side is cut and removed, and the knitted fabrics are knitted in a state in which the respective tearing surfaces are abutted. Return to the fabric structure, or pull out the ends of the cut strands, tear one half of the strand in the width direction, cut and remove one half, and put the tear surface and the other strand together By knit and returning it to the fabric structure, it is known that the strand connection can be repaired after weaving the yarn-broken fabric while keeping the surface of the fabric smooth without causing the strand connection portion to stand out. It came to complete.

  Accordingly, an object of the present invention is to provide a method for connecting strands constituting a woven fabric that solves the above problems.

  The present invention for achieving the above object is described below.

  [1] A method for connecting strands constituting a woven fabric in which yarn breakage occurs during weaving, wherein the two cut end portions of the broken strand are drawn out, and the respective centers in the width direction are along the longitudinal direction of the strand. The two halves of the two cut ends that are torn, and one half of the symmetric direction with respect to the longitudinal direction of the strand is cut and removed, and knitted in a state where the tear surfaces are in contact with each other. A method for connecting strands constituting a woven fabric characterized by being returned to the inside.

  [2] A method for connecting strands constituting a woven fabric in which yarn breakage occurs during weaving, in which two cut end portions of the cut strand are each drawn out, and the width direction of the cut end portion side of one strand is The center is torn along the longitudinal direction of the strand, one half of the torn cut end side is cut and removed, and the tear surface and the cut end side of the other strand are knitted together and knitted in the fabric structure. A method for connecting strands constituting a woven fabric characterized by being returned to

  [3] The method for connecting strands constituting the woven fabric according to [1] or [2], wherein the length of the tear surface in the strand longitudinal direction is 4 to 12 in terms of the number of crosses of the woven fabric.

  [4] The method for connecting the strands constituting the woven fabric according to [1] or [2], wherein the strands are carbon fiber filament bundles.

  According to the method for connecting the strands constituting the woven fabric of the present invention, the ends of the broken strands are drawn out, the half in the width direction is torn, the half on one side is cut and removed, and the knitted fabric is knitted in a state where the tearing surfaces of each other are abutted. The ends of the strands that have been returned or broken into the structure of each are pulled out, the half of one strand in the width direction is torn, the half on one side is cut and removed, and the tear surface and the other strand are butted together Since it is knitted and returned to the woven fabric structure, it is possible to repair the connection of the strands after weaving the broken fabric while keeping the surface of the woven fabric smooth.

  Hereinafter, the gas concentration measuring method of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic explanatory view showing an example of a method for connecting the strands constituting the fabric of the present invention, and explains the procedure in order from (a) to (d).

  The method for connecting the strands constituting the woven fabric of the present invention can be used for various woven fabric structures such as plain weave, twill weave and satin weave as the woven fabric structure. Particularly preferred for use in

  In FIG. 1 (a), 2 a and 2 b are the end portions of the broken strand 4. These end portions 2a and 2b are pulled out respectively. The length of the drawn strand 4 is preferably 4 to 20 in terms of the number of crosses of the weave of the woven fabric. If the length of the strand 4 to be pulled out is less than 4 in the number of crosses of the weave of the woven fabric, the connecting portion is detached again. When the length of the strand 4 to be drawn out exceeds 20 in the number of crosses of the woven fabric, it is difficult to return the strand 4 after the connection repair to the woven fabric.

  More preferably, the length of the drawn strand 4 is adjusted by the texture of the fabric used in the connection method. The preferred length of the strand 4 to be drawn out by the woven fabric structure is 5 to 20 when the woven fabric structure is a plain weave. 8-20.

  Next, as shown in FIG. 1 (b), the drawn strand 4 is torn at a substantially (approximately) center in the width direction. The portion where the strand 4 is torn is the central region in the strand width direction, and is within 20%, more preferably within 10% of the strand width.

  Thereafter, as shown in FIG. 1 (c), one side half of the torn strand 4 is cut and removed at the torn deepest portion. In FIG. 1C, 6 a is a tear surface formed by tearing the strand 4, and 8 a is a cut surface formed by cutting and removing one half of the strand 4 at the deepest portion torn.

  1 (b) and 1 (c) show the drawn strand 4 on the 2a side on the left side of FIG. 1 (a), the 2b side on the right side of FIG. It is the same. However, as shown in FIG. 1 (d), the half on one side to be cut and removed is a half on one side symmetrical to the longitudinal direction of the strand. The tear surface 6a and the cut surface 8a on the 2a side correspond to the tear surface 6b and the cut surface 8b on the 2b side, respectively.

  The length in the longitudinal direction of the strands of the tear surfaces 6a and 6b is preferably 4 to 12 in terms of the number of crosses of the weave of the fabric. When the length in the longitudinal direction of the strands of the tear surfaces 6a and 6b is less than 4 in terms of the number of crosses of the weave of the woven fabric, the connecting portion is detached again. When the length in the strand longitudinal direction of the tear surfaces 6a and 6b exceeds 12 in terms of the number of crosses of the weave of the fabric, it becomes difficult to return the strand 4 after the connection repair into the fabric structure.

  More preferably, the length in the longitudinal direction of the strands of the tear surfaces 6a and 6b is adjusted according to the texture of the fabric used in the connection method. The preferred length of the strands in the longitudinal direction of the strands of the tearing surfaces 6a and 6b by the fabric structure is 5 to 8 when the fabric structure is a plain weave. The number of crosses of the texture is 8 to 11.

  Next, as shown in FIG. 1 (d), the tear surface 6a and the tear surface 6b are knitted together and returned to the fabric structure.

  FIG. 2 is a schematic explanatory view showing another example of a method for connecting the strands constituting the fabric of the present invention, and explains the procedure in order from (a) to (d).

  In FIG. 2 (a), 12a and 12b are the end portions of the broken strands 14, respectively. These end portions 12a and 12b are pulled out respectively. The length of the drawn strand 14 is preferably 4 to 20 in terms of the number of crosses of the weave of the fabric. If the length of the strand 14 to be pulled out is less than 4 in the number of crosses of the weave of the woven fabric, the connecting portion is detached again. When the length of the strand 14 to be drawn out exceeds 20 in the number of crosses of the woven fabric, it becomes difficult to return the strand 14 after the connection repair to the woven fabric.

  More preferably, the length of the drawn-out strand 14 is adjusted by the texture of the fabric used for the connection method. The preferred length of the strand 14 to be drawn out by the woven fabric structure is 5 to 20 when the woven fabric structure is a plain weave. 8-20.

  Next, as shown in FIG. 2B, one of the cut ends of the drawn strand 14 is torn at a substantially central position in the width direction. The portion to tear the strand 14 is a central region in the strand width direction, and is within 20% of the strand width, more preferably within 10%.

  Thereafter, as shown in FIG. 2 (c), the torn strand 14 is cut and removed at one half of the torn deepest portion. In FIG. 2C, reference numeral 16a denotes a tear surface formed by tearing the strand 14, and reference numeral 18a denotes a cut surface formed by cutting and removing one half of the strand 14 at the deepest portion torn.

  2B and 2C illustrate the cut end portion 12a on the left side of FIG. 2A among the cut end portions of the drawn strand 14. FIG. On the other hand, the cut end side 12b on the right side of FIG. 2 (a) is not shown in FIGS. 2 (b) and 2 (c), but is not torn.

  Next, the tear surface 16a and the cut end portion side 12b of the other strand are knitted together and returned to the fabric structure.

  The length in the longitudinal direction of the strand on the cut end side 12b of the other strand that abuts the tear surface 16a is preferably 4 to 12 in terms of the number of crosses of the weave of the fabric. When the length of the strand longitudinal direction of the tear surface 16a and the abutting side 12b is less than 4 in terms of the number of crosses of the weave of the woven fabric, the connecting portion is detached again. When the length of the strand longitudinal direction of the tear surface 16a and the abutting side 12b exceeds 12 in terms of the number of crosses of the weave of the fabric, it is difficult to return the strand 4 after the connection repair to the fabric structure.

  More preferably, the length in the longitudinal direction of the strands of the tear surface 6a and the abutting side 12b is adjusted according to the texture of the fabric used for the connection method. The preferred length in the longitudinal direction of the strands of the tear surface 6a and the abutting side 12b by the fabric structure is 5 to 8 when the fabric structure is a plain weave, and in the case of a satin weave. The number of crosses of the fabric weave is 8 to 11.

  The strand used for the connecting method of the strand which comprises the textile fabric of this invention has a preferable thing which bundles 500-50000 filaments. Further, as the filament (fiber) constituting the strand, carbon fiber, glass fiber, Kevlar and the like are preferable, and carbon fiber is particularly preferable.

  By the above connection method, the woven fabric in which the broken strands have been repaired for connection is not conspicuous and the surface of the woven fabric is smooth. The smoothness of the surface of the woven fabric is maintained even when the woven fabric is laminated in multiple layers, and the connecting portion is strongly fixed by hardening with a resin. For this reason, the woven fabric in which the broken strands are repaired by the connection method of the present invention is particularly suitable as a reinforcing material for the fiber-reinforced composite material.

  The invention is illustrated in detail by the following examples.

Example 1
For a woven fabric of strands (plain weave, width 1000 mm, length 100 m) in which 3000 carbon fibers are bundled and yarn breakage occurred during weaving, connection repair of the broken strand was performed according to the procedure shown in FIG. .

  The length of the drawn strand 4 in FIG. 1 (a) is 10 at the number of crosses of the woven fabric, and the length in the longitudinal direction of the tear surfaces 6a and 6b in FIG. The number of crossings was 6. The surface of the fabric after the connection repair was smooth.

Example 2
For a woven fabric of strands (plain weave, width 1000 mm, length 100 m) in which 3000 carbon fibers are bundled and yarn breakage occurred during weaving, connection repair of the broken strand was performed according to the procedure shown in FIG. .

  The length of the drawn strand 14 in FIG. 2 (a) is 10 at the number of crosses of the weave of the woven fabric, and the length of the tear surface 16a and the butt side 12b in the strand longitudinal direction in FIG. The number of crosses of the weave was 6. The surface of the fabric after the connection repair was smooth.

It is a schematic explanatory drawing which shows an example of the connection method of the strand which comprises the textile fabric of this invention, Comprising: The procedure is demonstrated in order from (a) to (d). It is a schematic explanatory drawing which shows the other example of the connection method of the strand which comprises the textile fabric of this invention, Comprising: The procedure is demonstrated in order from (a) to (d).

Explanation of symbols

2a, 2b End side of broken strand 4 Strand 6a, 6b Strand tear surface 8a, 8b Strand cut surface 12a, 12b End side of broken strand 14 Strand 16a Strand tear surface 18a Strand cut surface

Claims (4)

A method for connecting strands constituting a woven fabric in which yarn breakage occurs during weaving, each of the two cut end portions of the broken strand is pulled out, and each of the substantially center in the width direction is torn along the longitudinal direction of the strand, One half of the two cut end portions torn and one half half symmetrical to each other with respect to the longitudinal direction of the strand is cut and removed, and knitted in a state where the tear surfaces are abutted with each other and returned to the fabric structure. A method for connecting strands constituting a woven fabric characterized by the above. A method for connecting strands constituting a woven fabric in which yarn breakage occurs during weaving, in which two cut end portions of the cut strand are drawn out, and a strand is formed at the substantially center in the width direction on the cut end portion side of one strand. Tearing along the longitudinal direction, cutting and removing one half of the torn cut end side, and weaving the teared surface and the cut end side of the other strand together to return to the fabric structure The connecting method of the strand which comprises the textile fabric characterized by these. The method for connecting strands constituting a woven fabric according to claim 1 or 2, wherein the length of the tear surface in the longitudinal direction of the strand is 4 to 12 in terms of the number of crosses of the weave of the woven fabric. The method for connecting strands constituting a woven fabric according to claim 1 or 2, wherein the strands are carbon fiber filament bundles.

Images