Elastically deformable flat shoelace and method for manufacturing the same

Abstract

The present invention provides a continuously knitted, flat shoelace that is resistant to unraveling and has different elastic deformation regions in the axial direction. [Solution] The flat shoelace has a structure in which a tubular braid made of split fiber yarn and other fiber yarn is flattened, with a central region in the axial direction, connecting regions on both sides of the central region, and end regions on the outside of the connecting regions, and the tensile modulus of elasticity of each region is as follows:

Description

Technical Field

[0001] The present invention relates to a flat shoe lace in which a plurality of regions having different tensile elastic moduli in the axial direction are arranged symmetrically about the left - right in the axial direction and continuously knitted, and a method for manufacturing the same.

Background Art

[0002] Conventional flat shoe laces have either a string that can stretch and contract with a certain tensile elastic modulus or a non - stretchable string, and thus could not fully meet the requirements of a variety of users.

[0003] For example, Japanese Patent Application Laid - Open No. 2020 - 180398 (Patent Document 1) discloses an invention of a flat shoe lace that is difficult to untie knots by using a core material in the shape of a mountain path and creating irregularities on the surface over the entire length of the shoe lace. However, like ordinary shoe laces, it is non - stretchable, has no elasticity, tightly holds the user's foot, and has a problem in appearance because it has an irregular pattern over the entire length.

[0004] Also, the full - text microfilm of Japanese Utility Model Publication No. 53 - 106133 (Patent Document 2) discloses an invention of a stretchable shoe lace by using spandex yarn and woolly nylon yarn. However, since this shoe lace has only a certain tensile elastic modulus, there is a problem in the fit feeling. Also, since it is a round string, the knot is easily untied, and there is also a problem in the appearance as a shoe lace.

[0005] The inventors of the present invention have solved the problems of the above - mentioned prior art and developed a continuously formed flat string having a region that can be elastically deformed in the axial direction and a region that cannot be elastically deformed in the axial direction, and having a semi - circular convex portion in the end region, so that it can be adapted to the usage purposes of a variety of products (Japanese Patent No. 660,6696, Patent Document 3).

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

[0007] The flat cord described in Patent Document 3 has the problem that when used as a shoelace, the fit due to elastic force is somewhat insufficient, because the end regions A on both the left and right sides in the axial direction are regions that do not elastically deform in the axial direction, and the intermediate region B sandwiched between regions A is a region that can elastically deform in the axial direction.

[0008] Furthermore, although the flat lace described in Patent Document 3 is flat overall, it has a core material, which gives it a slightly bulging shape in the center compared to those without a core material. This would seem to make the semi-circular protrusion rounded, thus making it less likely for the shoelace knot to come undone. However, experiments conducted by the inventors showed that it actually came undone easily (see experimental results shown in Table 5 below).

[0009] The present invention aims to provide a flat shoelace that is elastically deformable along its entire length, composed of multiple regions with varying tensile moduli to achieve an optimal fit, maintains a good appearance through its flat shape, and is less prone to unraveling knots despite its flat shape. [Means for solving the problem]

[0010] To achieve the above objective, the first invention of this application is: A flat shoelace that is continuously woven, with regions having different tensile moduli in the axial direction arranged symmetrically from the axial center, The aforementioned flat shoelace is, Split fiber yarn Three types: condensation polymerization synthetic fiber yarn, polyurethane elastic fiber yarn. It is a structure in which a tubular braided cord, which is woven from, is flattened and compressed. A central region is formed in the axial direction, connection regions are formed on both sides of the central region, and end regions are formed outside the connection regions. The aforementioned end region is the region where the knot of the flat shoelace is made. The ratio of the length of each region to the total length of the flat shoelace is 20-30% for the central region, 20-30% for the two connecting regions combined, and 48-53% for the two end regions combined. The tensile modulus of each region is, The central region < the end region < the connecting region. It is characterized by the following:

[0011] Furthermore, in order to achieve the above objective, the second invention of this application is a method for manufacturing the elastically deformable flat shoelace described above, Using split fiber yarn, condensation polymerized synthetic fiber yarn, and polyurethane-based elastic fiber yarn, Using a braiding device that has multiple bobbins arranged on the circumference of a circle centered on the opening of the braid and revolving around it in a plan view, and multiple cylindrical bodies, The cylindrical body is positioned at the rotation centers of the two bobbins that rotate in an S-shape clockwise and counterclockwise. The condensed polymerized synthetic fiber yarn and the split fiber yarn are unwound from the bobbin, the polyurethane elastic fiber yarn is pulled up vertically through the tubular body, and the condensed polymerized synthetic fiber yarn and the split fiber yarn are knitted around the polyurethane elastic fiber yarn while rotating them. By adjusting the thread pulling speed while keeping the orbital speed of the bobbin and the cylindrical body constant, a tubular braid is created having a central region, a connecting region, and an end region having different tensile moduli in the axial direction. The prepared tubular braid is flattened using a press roller. It is characterized by the following: [Effects of the Invention]

[0012] According to the first invention of the present application having the above configuration, by setting the tensile modulus of each region that can be elastically deformed in the axial direction to central region < end region < connecting region, the shoelace can provide an optimal fit.

[0013] Also, by pressing a tubular braided cord made of split fibers and other fiber cords into a flat shape, the frictional force of the split fibers can make it difficult to untie the knot of the shoelace. Therefore, it is particularly optimal as a shoelace for sports shoes used in intense sports and for athletes.

[0014] Moreover, according to the manufacturing method according to the second invention of the present application, the above flat shoelace can be manufactured by a simple method.

Brief Explanation of Drawings

[0015] [Figure 1] Schematic plan view of the flat cord according to an embodiment (Example 1) of the present invention [Figure 2] View showing the state in which the flat cord according to an embodiment (Example 1) of the present invention is used as a shoelace [Figure 3] Side schematic view schematically showing a side view of a manufacturing apparatus for creating a tubular braided cord that is the basis of the flat cord according to an embodiment (Example 1) of the present invention [Figure 4] Plan schematic view schematically showing a plan view of the thread arrangement [Figure 5] Schematic view showing the configuration of the press roller and the process in which the tubular braided cord is pressed by the press roller and becomes a flat cord flattened [Figure 6] Side view of the flat cord according to an embodiment (Example 1) of the present invention and a view showing the thickness of each region [Figure 7] Schematic plan view of the flat cord according to an embodiment (Example 3) of the present invention

Modes for Carrying Out the Invention

[0016] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to these embodiments in any way and can be implemented in various modes without departing from the gist thereof.

[0017] (Example 1: Configuration of Flat Shoelace) Figure 1 is a schematic plan view of an elastically deformable flat shoelace 1 (hereinafter referred to as "flat shoelace 1") according to Embodiment 1 of the present invention. Embodiment 1 has a structure in which the flat shoelace 1 does not have a core material inside, and is knitted with three types of yarn: false-twisted woolly nylon yarn, split fiber yarn, and polyurethane elastic fiber yarn (spandex) as condensation polymerized synthetic fiber yarns.

[0018] The flat cord 1 shown in Figure 1 represents the overall structure in its natural state without any external forces acting upon it. As illustrated, it is configured symmetrically from the axial center position, with a central region A, a connecting region B outside central region A, and an end region C outside connecting region B.

[0019] Furthermore, on the outside of the end region C, there are aglets (cell tips) D, similar to regular shoelaces, to make it easier to thread them through the shoelace holes.

[0020] The flat lace 1 is designed to provide an optimal fit as a shoelace through elastic deformation, and its central region A, connecting region B, and end region C are all elastically deformable in the axial direction, and its tensile modulus is Center area A<end area C<connection area B This means that the central region A is the most easily stretched, followed by the end region C, and the connecting region B is the least stretched and has a rigid structure.

[0021] Table 1 shows the results of measuring the tensile modulus of elasticity for each region. The measurements were taken by suspending a 7cm long string with the same configuration as each region vertically and attaching weights of 0.5kg and 1.0kg respectively, and measuring the elongation rate. This elongation rate is used as the basis for the tensile modulus of elasticity for each region.

[0022] Table 1 JPEG0007894185000002.jpg65135

[0023] As shown in the measurement results in Table 1, the tensile modulus of each region is as follows: central region A < end region C < connecting region B.

[0024] Furthermore, as shown in the figure, the end region C that forms the knot has multiple semicircular protrusions 2 that project outwards on both sides at appropriate intervals in a direction perpendicular to the axial length direction in a plan view of the flat cord 1, giving it a wave-like appearance in a plan view.

[0025] The length of flat lace 1, including aglets D, is assumed to be in two types, 950mm and 1100mm, just like regular shoelaces. The lengths of the central region A, connecting region B, and end region C are shown in Table 2 according to each length. The length of aglets D is 15mm in all cases, just like with typical shoelaces.

[0026] Table 2 JPEG0007894185000003.jpg36135

[0027] The lengths of the central region A, connecting region B, and end region C are not particularly limited, but are configured such that, in order to improve the user's fit, the central region A accounts for about 20-30% of the total length of the shoelace excluding the aglets D, the connecting region B accounts for about 20-30% in total (the two on each side), and the end region C accounts for about 48-53% in total (the two on each side). However, it is preferable that the lengths of each region be in the order shown in Table 2: connecting region B < central region A < end region C, in order to improve the user's shoelace fit.

[0028] As shown in Figure 1, the width of each region of the flat cord 1 in Example 1 (length in the direction perpendicular to the axial direction) is 6.6 mm for the central region Aw, 6.0 mm for the connecting region Bw, 6.5 mm for the semicircular convex portion Cw1, and 5.5 mm for the recess Cw2 between the semicircular convex portions, regardless of the length of the flat cord 1, in a plan view in its natural state. However, the width of each region is not particularly limited, as long as it is wide enough to pass through the various lace holes formed in the shoe.

[0029] Figure 2 shows the flat lace 1 being worn on a sports shoe. The most stretchable central region A is threaded through the eyelets on the toe side, the least stretchable connecting region B covers the instep of the wearer's foot, and the end region C, which is the next most stretchable after the central region A, forms a knot.

[0030] The flat cord 1 according to Example 1 does not have a core material and is formed into a flat shape by pressing and crushing a tubular braided cord X, which is made of three types of yarn: woolly nylon yarn, split fiber yarn, and polyurethane elastic fiber yarn (spandex), with a press roller.

[0031] The details of the manufacturing method are described below, but the flat cord 1 according to Example 1 is made by knitting a base tubular braided cord X using three types of yarn: woolly nylon yarn, split fiber yarn, and polyurethane elastic fiber yarn. This creates an optimal fit (elasticity) for a shoelace and, because it does not have a core material, it can be compressed into a sufficiently flat shape. In this Example 1, by providing a wave-shaped semi-circular convex portion in the end region C, the frictional force of the split fiber yarn is further strengthened, making it more difficult for knots to come undone even in a flat shape. In addition, instead of woolly nylon yarn, woolly polyester yarn or woolly processed aramid fiber yarn which is chemically similar to nylon may be used as the false-twisted condensation polymerized synthetic fiber yarn. In this Example, false-twisted condensation polymerized synthetic fiber was used to facilitate elastic deformation in the axial direction, but ordinary condensation polymerized synthetic fiber yarn which is not false-twisted may also be used.

[0032] (Example 1: Method for manufacturing flat shoelaces) The method for manufacturing the flat cord 1 according to the above-described example 1 will be explained below. Figure 3 is a schematic side view of the manufacturing apparatus 3 for creating the tubular braided cord X that forms the basis of the flat cord 1, and Figure 4 is a schematic plan view of the arrangement of the threads.

[0033] As shown in the figure, the manufacturing apparatus for the tubular braid X uses a conventional braid manufacturing apparatus equipped with multiple bobbins 4 and a cylindrical body 5 that are arranged on the circumference of a circle centered on the braiding opening 6 and revolve around it. The cylindrical body 5 is positioned at the center of two bobbins 4 that rotate in an S-shape clockwise and counterclockwise.

[0034] In Example 1, 32 bobbins 4 and 16 cylindrical bodies 5 are arranged around a circle. Woolly nylon yarn 7 and split fiber yarn 8 are wound onto each bobbin 4 and unwound. A polyurethane elastic fiber yarn 9 is pulled vertically from each cylindrical body 5, and the woolly nylon yarn 7 and split fiber yarn 8 are woven around the polyurethane elastic fiber yarn 9 at the opening 6 while rotating to create a tubular braided cord X. Note that the woolly nylon yarn 7 is arranged in sets of three, the split fiber yarn 8 in sets of three, and the polyurethane elastic fiber yarn 9 in sets of one.

[0035] In Example 1, the woolly nylon yarn 7 and split filament yarn 8 were evenly distributed in 24 bobbins 4 and 8 bobbins 4 respectively, so that the usage ratio (usage ratio, number ratio) of woolly nylon yarn 7 and split filament yarn 8 was 3:1.

[0036] During the braiding stage, the orbital speed of the bobbin 4 and the cylindrical body 5 is kept constant, and the thread pulling speed is adjusted to create a central region A, a connecting region B, an end region C, and a knotted section with different tensile moduli.

[0037] The method for manufacturing the tubular braided cord X having multiple tensile moduli in the axial direction described above is disclosed in detail in the applicant's Patent No. 6425364; please refer to it. Although Patent No. 6425364 has a core material in the center of the tubular braided cord, and Example 1 does not have a core material, the basic manufacturing method is the same.

[0038] The flat cord 1 according to Example 1 is completed by pressing the tubular braided cord X, created by the above manufacturing method, multiple times with the multi-stage press roller 10 shown in Figure 5 to flatten it. The semi-circular protrusion 2 is formed by pressing and crushing the knots formed on the tubular braided cord X with the press roller 10.

[0039] Figure 5 is a schematic diagram illustrating the configuration of the press roller 10 and the process by which the tubular braided cord X is pressed by the press roller 10 to become a flattened cord 1.

[0040] The press roller 10 consists of four upper and lower press rollers: the first press roller 10-1, the second press roller 10-2, the third press roller 10-3, and the fourth press roller 10-4. The tubular braided cord X passes through the first press section 11, the second press section 12, and the third press section 13 formed between each of the press rollers 10-1 to 10-4, being pressed in sequence, and finally becoming a flattened cord 1.

[0041] In Example 1, the outer diameter of the tubular braided cord X before pressing is set to 5 mm. Each press roller 10-1 to 10-4 has an outer diameter of 44.5 mm and weighs 1.0 to 1.2 kg. The gap in the first press section 11 is 0.75 mm, the gap in the second press section 12 is 0.46 mm, and the gap in the third press section 13 is 0.45 mm. However, the outer diameter and weight of each press roller, and the gaps in the first to third press sections can be appropriately determined depending on the desired flat cord 1 and the outer diameter of the tubular braided cord X before pressing, as well as the ratio of woolly nylon yarn 7 and split fiber yarn 8. Furthermore, the outer diameter of the tubular braided cord X before pressing is preferably 3 to 7 mm, and 5 to 6 mm is optimal for shoelaces.

[0042] In this embodiment, the outer diameter of the tubular braided cord X is increased by using 32 strands of woolly nylon yarn 7 and split fiber yarn 8, and 16 strands of polyurethane elastic fiber yarn 9. The pressing process with the press roller 10 results in a flat cord 1 that is sufficiently flat and provides a good fit. However, the pressing pressure and number of presses can be adjusted as appropriate and are not particularly limited. Furthermore, by adjusting the pressing pressure and number of presses, it is possible to reduce the number of strands of each fiber by about half and use a tubular braided cord X with a narrow outer diameter to make a narrow flat cord, and vice versa (increasing the number of strands to make a wider flat cord).

[0043] (Example 1: Characteristics of flat cord) Table 3 shows the thickness of each region in a side view of the flat cord 1 according to Embodiment 1 shown in Figure 6. As shown in Figure 6, At is the thickness of the central region A, Bt is the thickness of the connecting region, Ct1 is the thickness of the semicircular protrusion at the end region, and Ct2 is the thickness between the semicircular protrusions.

[0044] Table 3 JPEG0007894185000004.jpg33135

[0045] Table 4 shows the ratio of width w to thickness (t / w) of each region of the flat cord 1 according to Example 1, representing the flattening ratio of each region, with smaller values ​​indicating greater flatness.

[0046] Table 4 JPEG0007894185000005.jpg29135

[0047] As shown in Tables 3 and 4, a tubular braided cord X, which consists of at least 32 strands of woolly nylon yarn 7 and split fiber yarn 8, and 16 strands of polyurethane elastic fiber yarn 9, can be pressed with a press roller to produce a flat cord with a sufficiently flat shape.

[0048] As mentioned above, in Example 1, the ratio of woolly nylon yarn 7 to split fiber yarn 8 was 3:1. However, the ratio of split fiber yarn 8 used (ratio of strands) is not limited to this ratio, as long as it produces the necessary frictional force for a knot that is difficult to unravel.

[0049] To investigate how much difference the ratio of woolly nylon yarn 7 to split fiber yarn 8 makes in the resistance of knots to coming undone, three types of flat cords 1 were made using woolly nylon yarn 7 and split fiber yarn 8 in ratios of 7:1, 3:1, and 1:1. One end of each cord (end region C) was fixed, and the other end was pulled with a force of 5 kg to create a knot. The force (kg) required to untie this knot was measured five times, and the average value was calculated.

[0050] Furthermore, experiments were conducted under the same conditions on conventional flat cords that do not use split fiber yarn, and the differences from Example 1 were clarified as Comparative Example 1. Comparative Example 1 is a flat cord related to Patent No. 6425364, in which the outer layer is non-stretchable, woven from nylon yarn, and the core material is an elastic core material made of rubber or the like. The experimental results are summarized in Table 5.

[0051] Table 5 JPEG0007894185000006.jpg41135

[0052] According to the experimental results above, a minimum ratio of 7:1 between woolly nylon yarn 7 and split fiber yarn 8 provides a sufficiently strong resistance to unraveling compared to any conventional flat lace. The experimental results also show that variability is suppressed, resulting in a stable "unraveling resistance effect." Since split fiber yarn 8 is more expensive than woolly nylon yarn 7, its usage ratio should ideally be between 7:1 and 1:1. The usage ratio of split fiber yarn 8 should be adjusted as appropriate depending on the intended use of the shoelace and the required level of unraveling resistance.

[0053] (Example 2: Structure and manufacturing method of flat cord) Example 2 is similar to Example 1 in that woolly nylon yarn 7, split fiber yarn 8, and polyurethane elastic fiber yarn 9 are knitted into a tube shape with the same number of dots, and then pressed with the same pressure and the same number of times using the same press roller to produce a flat cord 1. The difference from Example 1 is that it has a core material.

[0054] The core material may be elastic and deformable, or non-elastic, but here a core material made by braiding two fine polyester threads was used. By having an elastic or non-elastic core material, the flatness ratio is slightly reduced and the tensile modulus of elasticity in each region is also reduced (the overall lace becomes less stretchy), but it is possible to make a flat lace 1 with a stiffness that meets the needs of users such as athletes for shoes used in strenuous exercise. The manufacturing method when using the core material is basically the same as that disclosed in Japanese Patent No. 6425364, so the explanation is omitted.

[0055] Although Example 2 has a core material, its outer layer is composed of the same yarn as in Example 1 (woolly nylon yarn 7, split fiber yarn, polyurethane elastic fiber yarn), so the knot's resistance to unraveling is the same as in Example 1. The flatness of Example 2 is summarized in Table 6 below, with the width w and thickness t of each region measured using the same method as in Example 1. As shown in Table 6, Example 2, which uses a core material, is sufficiently flat, comparable to Example 1.

[0056] Table 6 JPEG0007894185000007.jpg37135

[0057] (Example 3: Structure and manufacturing method of flat cord) Figure 7 is a plan view of a flat cord 1 according to Embodiment 3 of the present invention. Embodiment 3 uses woolly polyester yarn 7 as a false-twisted fiber yarn of condensation polymerized synthetic fiber 7, and knits it together with split fiber yarn 8 and polyurethane elastic fiber yarn 9 into a tube shape. Then, it is pressed with the same pressure and the same number of times using the same press roller to produce a flat cord 1. The difference from Embodiments 1 and 2 is that it does not have a semi-circular convex portion at the end region C, and the sides are straight like a typical flat cord, and the ratio of condensation polymerized synthetic fiber 7 (woolly polyester 7) to split fiber yarn 8 (usage ratio, number ratio) is 7:1 when knitting.

[0058] Table 7 shows the results of measuring the tensile modulus of each region in the flat cord 1 according to Example 3. The measurement was performed in the same manner as in Example 1, by suspending a cord of natural length 7 cm with the same configuration as each region in the vertical direction and measuring the elongation rate when weights of 0.5 kg and 1.0 kg were attached to each region. This elongation rate is shown as the basis for the tensile modulus of each region. As shown in the measurement results in Table 7, the tensile modulus of each region is in the order of central region A < end region C < connecting region B.

[0059] Table 7 JPEG0007894185000008.jpg66135

[0060] The length of the flat lace 1 including the aglet D in Example 3 is 1100 mm in total length, the same as a normal shoelace, and the lengths of the central region A, connecting region B, and end region C are as shown in Table 8 to match the total length.

[0061] Table 8 JPEG0007894185000009.jpg26135

[0062] For Flat Cord 1 in Example 3, an experiment was conducted to assess the resistance of the knot to coming undone, similar to Example 1. The experimental method was the same as in Example 1: one end was fixed, and the other end was pulled with a force of 5 kg to create a knot. The force (kg) required to untie this knot was measured five times, and the average value was calculated. The experimental results, along with the values ​​for Comparative Example 1 mentioned above, are summarized in Table 9.

[0063] Table 9 JPEG0007894185000010.jpg31135

[0064] As shown in Table 9, even without a semicircular protrusion at the end region C, and with a straight side shape similar to a typical flat cord, using a predetermined amount of split fiber yarn resulted in a knot that was slightly less secure to unravel than Example 1, which had a semicircular protrusion at the end region, but still sufficiently less secure to unravel compared to Comparative Example 1.

[0065] As described above, the elastically deformable flat shoelace according to the present invention can provide an optimal fit as a shoelace by setting the tensile modulus of elasticity of each region that can be elastically deformed in the axial direction to central region < end region < connecting region.

[0066] Furthermore, by pressing a tubular braid made of condensed polymerized synthetic fiber yarn, split fiber yarn, and polyurethane elastic fiber yarn, it can be made into a flat shape. The frictional force of the split fiber yarn makes it difficult for the knot to come undone even if the shoelace is flat, and it can withstand strenuous exercise. [Explanation of symbols]

[0067] 1. Flat shoelaces 2. Semicircular protrusion 3. Braided cord manufacturing apparatus 4 bobbins 5. Cylindrical body 6. Knit opening 7. Condensed polymerized synthetic fiber yarn (woolly nylon yarn, woolly polyester yarn) 8-ply fiber yarn 9. Polyurethane-based elastic fiber yarn 10 Press Rollers 10-1 First Press Roller 10-2 Second press roller 10-3 Third press roller 10-4 Fourth press roller 11 First Press Department 12 Second Press Department 13 Third Press Department A central area B Connection area C end area D Aglet X tubular braided cord

Claims

1. A flat shoelace that is continuously woven, with regions having different tensile moduli in the axial direction arranged symmetrically from the axial center, The aforementioned flat shoelace is, It has a structure in which a tubular braided cord, woven from three types of fibers—split fiber yarn, condensed polymerized synthetic fiber yarn, and polyurethane-based elastic fiber yarn—is flattened and compressed. A central region is formed in the axial direction, connection regions are formed on both sides of the central region, and end regions are formed outside the connection regions. The aforementioned end region is the region where the knot of the flat shoelace is made. The ratio of the length of each region to the total length of the flat shoelace is 20-30% for the central region, 20-30% for the two connecting regions combined, and 48-53% for the two end regions combined. The tensile modulus of each region is, The central region < the end region < the connecting region. A flat shoelace characterized by its elastic deformability.

2. The ratio of the condensed polymerized synthetic fiber yarn to the split fiber yarn used is 7:1 to 1:

1. The elastically deformable flat shoelace according to feature 1.

3. The aforementioned condensation polymerized synthetic fiber yarn is a false-twist synthetic fiber yarn made of nylon, polyester, or aramid. The elastically deformable flat shoelace according to feature 1.

4. The end region has a plurality of semicircular projections that protrude in a direction perpendicular to the axial direction in a plan view. The elastically deformable flat shoelace according to feature 1.

5. The flat shoelace has an elastic or non-elastic core material. The elastically deformable flat shoelace according to feature 1.

6. A method for manufacturing an elastically deformable flat shoelace according to claim 1, Using a braiding device that has multiple bobbins arranged on the circumference of a circle centered on the opening of the braid and revolving around it in a plan view, and multiple cylindrical bodies, The cylindrical body is positioned at the rotation centers of the two bobbins that rotate in an S-shape clockwise and counterclockwise. The condensed polymerized synthetic fiber yarn and the split fiber yarn are unwound from the bobbin, the polyurethane elastic fiber yarn is pulled up vertically through the tubular body, and the condensed polymerized synthetic fiber yarn and the split fiber yarn are knitted around the polyurethane elastic fiber yarn while rotating them. By adjusting the thread pulling speed while keeping the orbital speed of the bobbin and the cylindrical body constant, a tubular braid is created having a central region, a connecting region, and an end region having different tensile moduli in the axial direction. The prepared tubular braid is flattened using a press roller. A method for manufacturing an elastically deformable flat shoelace, characterized by the following:

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