Extendable cord and preparation method thereof

Abstract

The invention belongs to the technical field of textiles, and provides an extendable cord and a preparation method thereof. A core layer material is fed into a twisting area of a winding machine, the winding layer material spirally winds a core layer through a hollow spindle of the winding machine, and composite yarn of a core-sheath structure is formed; the composite yarn is stranded and twisted to obtain the extendable line; the material of the core layer is a yarn, a filament or a silk formed by a removable material; and the winding layer is made of filaments or staple fiber yarns formed by fibers. After the core layer of the extension cord is removed, the extension cord has a non-springback elongation rate, and the application field of the extension cord is expanded; meanwhile, the preparation of the extendable cord can be realized under simple conditions, and the obtained extendable cord is uniformly dyed.

Description

Technical Field

[0001] This invention relates to the field of textile technology, and in particular to an extendable yarn and its preparation method. Background Technology

[0002] In the field of textile materials, traditional stretchable yarns (such as spandex core-spun yarn) generally rely on elastomers to provide resilience, which suffers from problems such as limited resilience, hardened hand feel, and fatigue after repeated stretching. Furthermore, their "active rebound" mechanism cannot meet the application requirements of simply extending in one direction and maintaining a stable shape. Current technologies, limited by the inherent concept of "elastic recovery," are still lacking in the development of passive elastic yarns with "controllable elongation and shape locking." At the same time, traditional multi-component elastic yarns also suffer from the inherent problem of uneven dyeing due to the differences in the color absorption properties of different fibers. Summary of the Invention

[0003] In view of this, the purpose of this invention is to provide an extendable yarn and its preparation method. The extendable yarn obtained by the preparation method provided by this invention has a non-springback elongation rate after core layer removal, thus expanding the application range of extendable yarns. Simultaneously, this invention enables the dyeing of extendable yarns under simple conditions, and the resulting extendable yarns are uniformly dyed. To achieve the above-mentioned objectives, the present invention provides the following technical solution: This invention provides a method for preparing an extendable wire, comprising the following steps: The core material is passed vertically through the hollow shaft of the hollow spindle, and a bobbin with the winding layer material is installed on the auxiliary spindle that rotates with the hollow spindle. When the core material is pulled upward, the rotating auxiliary spindle drives the winding layer material to continuously wind around the stationary core material, so that the winding layer material is evenly wound around the core material in the form of a spiral, forming a composite yarn with a core-sheath structure. The composite yarn is twisted and ply-stretched to obtain the extendable yarn; The core material is a yarn, filament, or thread formed from a removable material; The winding layer material is a filament or short fiber yarn formed from fibers.

[0004] Preferably, the core material is water-soluble polyvinyl alcohol yarn, water-soluble polyvinyl alcohol filament, alkali-soluble yarn, or hot-melt yarn.

[0005] Preferably, the fiber includes one or more of natural fibers, synthetic fibers, and regenerated cellulose fibers; The natural fibers include one or more of cotton, linen, and wool; The synthetic fibers include one or more of polyester fibers, acrylic fibers, and nylon fibers; The regenerated cellulose fibers include one or more of Tencel, Modal, and viscose.

[0006] Preferably, the feeding rate of the core material is 5~15m / min.

[0007] Preferably, the covering angle of the hollow spindle is 10~75°.

[0008] Preferably, the mass ratio of the core layer material to the winding layer material is (10~30):(70~90).

[0009] Preferably, the twist of the composite yarn is 40 to 500.

[0010] Preferably, the twisting and plying step is as follows: The two composite yarns are combined and twisted together using the same twisting unit to obtain the extendable yarn. The confluence is achieved via a guide wire; The twisting unit is a spindle.

[0011] The present invention also provides an extendable wire prepared by the preparation method described in the above technical solution.

[0012] Preferably, the elongation rate of the extendable line is 1~50%.

[0013] This invention provides a method for preparing an extendable wire.

[0014] The preparation method of this invention utilizes a winding machine to spirally wind the core material with a winding layer material, forming a composite yarn with a core-sheath structure. The composite yarn is then twisted and plyed to obtain an extendable yarn. The extendable yarn obtained by this invention exhibits a non-rebound elongation rate after removing the core layer, expanding the application range of extendable yarns. This invention uses filament or staple fiber yarns as the winding layer material and pre-dyes them, giving the extendable yarn a rich variety of colors. Compared to dyeing the fiber raw materials, dyeing the filament or staple fiber yarns is simpler and more efficient; compared to dyeing after forming the core-spun yarn, the dyeing effect is more uniform. Attached Figure Description

[0015] Figure 1 Microscopic image of the composite yarn with core-sheath structure obtained in Example 1; Figure 2 Microscopic image of the extendable line obtained in Example 1; Figure 3 The image shows a comparison of the extendable line obtained in Example 1 before and after water-soluble treatment. Figure 4 The image shows a comparison of the extendable line obtained in Example 2 before and after water-soluble treatment. Figure 5 This is a comparison diagram of the extendable line obtained in Example 3 before and after water-soluble treatment. Detailed Implementation

[0016] This invention provides a method for preparing an extendable wire, comprising the following steps: The core material is passed vertically through the hollow shaft of the hollow spindle, and a bobbin with the winding layer material is installed on the auxiliary spindle that rotates with the hollow spindle. When the core material is pulled upward, the rotating auxiliary spindle drives the winding layer material to continuously wind around the stationary core material, so that the winding layer material is evenly wound around the core material in the form of a spiral, forming a composite yarn with a core-sheath structure. The composite yarn is twisted and ply-stretched to obtain the extendable yarn; The core material is a yarn, filament, or thread formed from a removable material; The winding layer material is a filament or short fiber yarn formed from fibers.

[0017] Unless otherwise specified, the raw materials used in this invention are preferably commercially available products.

[0018] In this invention, the core material is passed vertically through the hollow shaft of a hollow spindle, and a bobbin with a winding layer material is installed on a secondary spindle that rotates with the hollow spindle. When the core material is pulled upward, the rotating secondary spindle drives the winding layer material to continuously wind around the stationary core material, so that the winding layer material is evenly wound around the core material in the form of a spiral, forming a composite yarn with a core-sheath structure.

[0019] In this invention, the core material is a yarn, filament, or thread formed from a removable material, specifically preferably a water-soluble polyvinyl alcohol yarn, a water-soluble polyvinyl alcohol filament, an alkali-soluble filament, or a hot-melt filament. In this invention, the count of the water-soluble polyvinyl alcohol yarn is preferably 10-200, specifically preferably 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, or 200; the water solubility temperature of the water-soluble polyvinyl alcohol yarn is preferably 20-100℃, specifically preferably 20℃, 30℃, 40℃, 50℃, 60℃, 70℃, 80℃, 90℃, or 100℃.

[0020] In this invention, the fineness of the water-soluble polyvinyl alcohol filament is preferably 20~200D, specifically preferably 20D, 30D, 40D, 50D, 60D, 70D, 80D, 90D, 100D, 110D, 120D, 130D, 140D, 150D, 160D, 170D, 180D, 190D or 200D; the water solubility temperature of the water-soluble polyvinyl alcohol filament is preferably 20~100℃, specifically preferably 20℃, 30℃, 40℃, 50℃, 60℃, 70℃, 80℃, 90℃ or 100℃.

[0021] In this invention, the fineness of the alkali-soluble fiber is preferably 50~200D, specifically preferably 50D, 60D, 70D, 80D, 90D, 100D, 110D, 120D, 130D, 140D, 150D, 160D, 170D, 180D, 190D, or 200D. In this invention, the alkali-soluble temperature of the fiber is preferably 50~95℃, specifically preferably 50℃, 60℃, 70℃, 80℃, 90℃, or 95℃.

[0022] In this invention, the fineness of the hot melt wire is preferably 50~300D, specifically preferably 50D, 100D, 150D, 200D, 250D or 300D. In this invention, the hot melt temperature of the hot melt wire is preferably 70~150℃, specifically preferably 70℃, 80℃, 90℃, 100℃, 110℃, 120℃, 130℃, 140℃ or 150℃.

[0023] In this invention, the winding layer material is a filament or staple yarn formed from fibers. In this invention, the fibers preferably include one or more of natural fibers, synthetic fibers, and regenerated cellulose fibers. In this invention, the natural fibers preferably include one or more of cotton, linen, and wool. In this invention, the synthetic fibers preferably include one or more of polyester fibers, acrylic fibers, and nylon fibers. In this invention, the regenerated cellulose fibers preferably include one or more of Tencel, Modal, and viscose.

[0024] In this invention, the winding layer material is preferably one or more selected from cotton yarn, linen yarn, wool yarn, polyester yarn, polyester filament, acrylic yarn, acrylic filament, nylon yarn, nylon filament, viscose yarn, and viscose filament. In this invention, the cotton yarn preferably has a count of 8-300S; the linen yarn preferably has a count of 7-35S; the wool yarn preferably has a count of 6-80S; the polyester yarn preferably has a count of 16-120S, and the polyester filament preferably has a count of 20-300D; the acrylic yarn preferably has a count of 8-80S, and the acrylic filament preferably has a count of 3D-50D; the nylon yarn preferably has a count of 20-80S, and the nylon filament preferably has a count of 10-420D; the viscose yarn preferably has a count of 30-80S, and the viscose filament preferably has a count of 40-300D.

[0025] In this invention, the winding layer material is preferably a pre-dyed winding layer material. The preparation method of the pre-dyed winding layer material preferably includes the following steps: sequentially loosening the winding layer material, dyeing, washing, dehydrating, drying, and unwinding the winding layer material to obtain the pre-dyed winding layer material. This invention does not specifically limit the operations of loosening the winding layer, dyeing, washing, dehydrating, drying, and unwinding the winding layer; operations well-known to those skilled in the art can be used.

[0026] In this invention, the preferred mass ratio of the core layer material to the winding layer material is (10~30):(70~90), and more preferably 10:90, 15:85, 20:80, 25:75 or 30:70.

[0027] In this invention, the feeding rate of the core material is preferably 5 to 15 m / min, and more preferably 5 m / min, 10 m / min or 15 m / min.

[0028] In this invention, the covering angle of the hollow spindle is preferably 10~75°, and more specifically 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70° or 75°.

[0029] In this invention, the twist of the composite yarn is preferably 40 to 500.

[0030] In this invention, the core layer material and the winding layer material are preferably fed into the hollow spindle and the auxiliary spindle respectively through a wire guide, a wire guide hook and a wire separating reed.

[0031] After forming a composite yarn with a core-sheath structure, the present invention further twists and plies the composite yarn to obtain the extendable yarn.

[0032] In this invention, the twisting step is preferably performed by combining two composite yarns and then twisting them together using the same twisting unit to obtain the extendable yarn. In this invention, the combining is preferably done using a yarn guide. In this invention, the twisting unit is preferably a spindle.

[0033] After forming the extendable yarn, the present invention preferably further includes: winding the extendable yarn into a shape. Specifically, the winding step involves using precision machinery or a servo motor to control the winding of the extendable yarn into a well-shaped, uniformly dense, and large-capacity conical or parallel cylinder. In this invention, the conical or parallel cylinder facilitates transportation, storage, and subsequent weaving and knitting.

[0034] The present invention also provides an extendable wire prepared by the preparation method described in the above technical solution.

[0035] In this invention, the elongation rate of the extendable line is 1 to 50%.

[0036] In this invention, after the extendable yarn is spun according to actual needs, it preferably further includes removing the core layer of the extendable yarn. In this invention, the removal method is preferably water-soluble, alkali-soluble, or heat-melted. In this invention, the water-soluble method is preferably water bath treatment. In this invention, the alkali-soluble reagent is preferably a sodium hydroxide solution with a mass concentration of 5-10%. In this invention, the heat-melted method is preferably heat setting.

[0037] The following detailed description of the extendable wire and its preparation method provided by the present invention, with reference to the embodiments, should not be construed as limiting the scope of protection of the present invention.

[0038] Example 1 The core material and winding layer material, which are unloaded from the bobbin, are clearly separated by a guide, guide hook, and splitting reed and guided to the correct position. The core material passes vertically through the hollow shaft of the hollow spindle. The bobbin with the winding layer material is mounted on an auxiliary spindle that rotates with the hollow spindle. When the core layer is pulled upward, the rotating auxiliary spindle drives the winding layer material to continuously wind around the stationary core material, so that the covering layer is evenly wound around the core material in a spiral shape, forming a composite yarn with a core-sheath structure. The core material is water-soluble polyvinyl alcohol yarn (water-soluble temperature of 90°C, count of 40), and the feeding rate is 10m / min. The winding layer material is polyester filament (count of 100D). The covering angle of the hollow spindle is 75°. The twist of the resulting composite yarn with a core-sheath structure is 400.

[0039] Two composite yarns are brought together by a yarn guide and then passed together through a spindle to twist them together, forming an extendable yarn.

[0040] Figure 1 This is a microscope image of a composite yarn with a core-sheath structure. Figure 2 The image shows a microscope image of the resulting extendable line.

[0041] The extendable yarn was placed in a water bath at 90°C for water dissolution; after water dissolution, the elongation rate was 25%.

[0042] Figure 3 This is a comparison image of the extendable line before and after water-soluble treatment.

[0043] Example 2 The core material and winding layer material, which are removed from the bobbin, are clearly separated by a guide, guide hook, and separating reed, and guided to the correct position. The core material passes vertically through the hollow shaft of the hollow spindle. The bobbin with the winding layer material is mounted on an auxiliary spindle that rotates with the hollow spindle. When the core layer is pulled upward, the rotating auxiliary spindle drives the winding layer material to continuously wind around the stationary core material, so that the covering layer is evenly wound around the core material in a spiral shape, forming a composite yarn with a core-sheath structure. The core material is water-soluble polyvinyl alcohol yarn with a water solubility temperature of 90°C, a count of 40, and a feeding rate of 10m / min. The winding layer material is polyester yarn with a count of 50S. The covering angle of the hollow spindle is 75°. The twist of the resulting composite yarn is 400.

[0044] Two composite yarns are brought together by a yarn guide and then passed together through a spindle to twist them together, forming an extendable yarn.

[0045] The extendable yarn was placed in a water bath at 90°C for water dissolution; after dissolution, the elongation rate was 50%.

[0046] Figure 4 This is a comparison image of the extendable line before and after water-soluble treatment.

[0047] Example 3 The core material and winding layer material, which are unloaded from the bobbin, are clearly separated by a guide, guide hook, and separating reed, and guided to the correct position. The core material passes vertically through the hollow shaft of the hollow spindle. The bobbin with the winding layer material is mounted on an auxiliary spindle that rotates with the hollow spindle. When the core layer is pulled upward, the rotating auxiliary spindle drives the winding layer material to continuously wind around the stationary core material, so that the covering layer is evenly wound around the core material in a spiral shape, forming a composite yarn with a core-sheath structure. The core material is water-soluble polyvinyl alcohol yarn with a water solubility temperature of 90°C, a count of 40, and a feeding rate of 10m / min. The winding layer material is polyester filament with a count of 100D. The covering angle of the hollow spindle is 35°. The twist of the resulting composite yarn is 400.

[0048] Two composite yarns are brought together by a yarn guide and then passed together through a spindle to twist them together, forming an extendable yarn.

[0049] The extendable yarn was placed in a water bath at 90°C for water dissolution; after dissolution, the elongation rate was 10%.

[0050] Figure 5 This is a comparison image of the extendable line before and after water-soluble treatment.

[0051] Example 4 The core material and winding layer material, which are unloaded from the bobbin, are clearly separated by a guide, guide hook, and separating reed, and guided to the correct position. The core material passes vertically through the hollow shaft of the hollow spindle. The bobbin with the winding layer material is mounted on an auxiliary spindle that rotates with the hollow spindle. When the core layer is pulled upward, the rotating auxiliary spindle drives the winding layer material to continuously wind around the stationary core material, so that the covering layer is evenly wound around the core material in a spiral shape, forming a composite yarn with a core-sheath structure. The core material is water-soluble polyvinyl alcohol filament with a water solubility temperature of 80°C, a count of 38D, and a feed rate of 10m / min. The winding layer material is pre-dyed polyester filament with a count of 100D. The covering angle of the hollow spindle is 75°. The twist of the resulting composite yarn is 400.

[0052] Two composite yarns are brought together by a yarn guide and then passed together through a spindle to twist them together, forming an extendable yarn.

[0053] The extendable yarn was placed in a water bath at 80°C for water dissolution; after dissolution, the elongation rate was 8%.

[0054] The method for preparing pre-dyed polyester filament comprises the following steps: sequentially loosening the polyester filament, dyeing, washing, dehydrating, drying, and rewinding the polyester filament to obtain the pre-dyed polyester filament.

[0055] Example 5 The difference from Example 1 is that the polyester filament of the winding layer material is pre-dyed. Specifically, the polyester filament is sequentially loosened from the coil, dyed, washed, dehydrated, dried, and uncoiled to obtain the pre-dyed polyester filament. Everything else is the same as in Example 1.

[0056] Method: Using a high-precision colorimeter, at least 30 points were continuously measured on the same and different rolls of filament to obtain the values ​​of L, a, b, etc.

[0057] Color difference standard deviation: The color difference standard deviation of the pre-dyed polyester filament obtained by the present invention is 0.4, which is significantly less than the color difference standard deviation of 1.5 of commercially available pre-dyed polyester filament, indicating that the color dispersion of the pre-dyed polyester filament obtained by the present invention is small.

[0058] Intra-batch / inter-batch color difference: The polyester filament of the present invention is dyed in the same dyeing vat, and the standard deviation of inter-batch color difference can be controlled within 0.8, which is less than the average standard deviation of color difference of 2.5 for different production batches of commercially available pre-dyed polyester filament.

[0059] Example 6 The difference from Example 2 is that the polyester yarn used for the winding layer is pre-dyed. Specifically, the polyester yarn is sequentially loosened from the bobbin, dyed, washed, dehydrated, dried, and unrolled to obtain the pre-dyed polyester yarn. Everything else is the same as in Example 2.

[0060] Method: Under a standard light source box (such as D65 light source), multiple observers rated the color uniformity of the yarn samples with reference to the "Grey Sample Card".

[0061] Grading statistics: The average color difference between samples of polyester yarn dyed with commercially available raw materials is 1.8, while the average color difference between samples of pre-dyed polyester yarn obtained by this invention is 0.6.

[0062] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing an extendable wire, characterized in that, Includes the following steps: The core material is passed vertically through the hollow shaft of the hollow spindle, and a bobbin with the winding layer material is installed on the auxiliary spindle that rotates with the hollow spindle. When the core material is pulled upward, the rotating auxiliary spindle drives the winding layer material to continuously wind around the stationary core material, so that the winding layer material is evenly wound around the core material in the form of a spiral, forming a composite yarn with a core-sheath structure. The composite yarn is twisted and ply-stretched to obtain the extendable yarn; The core material is a yarn, filament, or thread formed from a removable material; The winding layer material is a filament or short fiber yarn formed from fibers.

2. The preparation method according to claim 1, characterized in that, The core material is water-soluble polyvinyl alcohol yarn, water-soluble polyvinyl alcohol filament, alkali-soluble yarn, or hot-melt yarn.

3. The preparation method according to claim 1, characterized in that, The fibers include one or more of natural fibers, synthetic fibers, and regenerated cellulose fibers; The natural fibers include one or more of cotton, linen, and wool; The synthetic fibers include one or more of polyester fibers, acrylic fibers, and nylon fibers; The regenerated cellulose fibers include one or more of Tencel, Modal, and viscose.

4. The preparation method according to claim 1, characterized in that, The feeding rate of the core material is 5~15m / min.

5. The preparation method according to claim 1, characterized in that, The covering angle of the hollow ingot is 10~75°.

6. The preparation method according to claim 1, characterized in that, The mass ratio of the core material to the winding layer material is (10~30):(70~90).

7. The preparation method according to claim 1, characterized in that, The twist of the composite yarn is 40~500.

8. The preparation method according to claim 1, characterized in that, The twisting and plying steps are as follows: The two composite yarns are combined and twisted together using the same twisting unit to obtain the extendable yarn. The confluence is achieved via a guide wire; The twisting unit is a spindle.

9. The extension line prepared by the method according to any one of claims 1 to 8.

10. The extendable line according to claim 9, characterized in that, The elongation rate of the extendable line is 1~50%.

Images