Method for regulating the thermal performance of a ring spun composite hollow yarn

Abstract

The present application belongs to the technical field of multi-axle system ring composite spinning, and relates to a method for regulating the thermal performance of ring spinning composite hollow yarn, which comprises the following steps: immersing ring spinning composite yarn with a water-soluble vinylon filament as the core layer and non-water-soluble short fibers as the coating layer into water at a certain temperature, so that the core layer of the ring spinning composite yarn is completely or partially dissolved, and ring spinning composite hollow yarn is obtained; by controlling the number of water-soluble vinylon filaments in the core layer of the ring spinning composite yarn and using water-soluble vinylon filaments with the same or different dissolution temperatures, the thermal performance of the ring spinning composite hollow yarn is regulated; the number of water-soluble vinylon filaments in the core layer of the ring spinning composite yarn is 1-3, and the dissolution temperatures of each water-soluble vinylon filament are the same or different. The present application realizes the generation of hollow structure by a pure physical method, without any chemical residue, and is green and environmentally friendly; by flexibly regulating the feeding number and type of water-soluble vinylon filaments, the mechanical properties of the yarn can be optimized while meeting different thermal performance requirements.

Description

Technical Field

[0001] This invention belongs to the field of multi-axis ring spinning composite yarn technology, and relates to a method for controlling the heat retention performance of ring-spun composite hollow yarn. Background Technology

[0002] With the development of society and the economy, people's living standards have gradually improved, leading to an increasing demand for functional textiles, especially for clothing that offers both warmth and comfort. Traditional insulating materials, such as wool and cotton, while possessing good warmth retention, suffer from shortcomings in terms of lightweight and breathability. In recent years, hollow fibers have attracted widespread attention due to their unique internal structure and excellent warmth retention properties. The hollow structure within hollow fibers effectively traps still air; because air has a low thermal conductivity, this structure significantly hinders heat transfer, thus achieving excellent warmth retention. However, hollow fibers used alone have limitations in terms of fiber strength and abrasion resistance. Therefore, combining hollow fibers with other types of fibers to prepare composite yarns with superior overall performance has become an important research direction in the textile field.

[0003] Ring spinning technology, due to its advantages of dense yarn structure and high strength, is widely used in the development of composite yarns. In recent years, the emergence of multi-axis composite spinning technology has provided new ideas for the design of functional yarns. By introducing multiple core yarns and sheath fibers, yarns can be endowed with special structures and properties. However, in existing technologies, the distribution and dissolution of the core yarns are poorly controllable, making it difficult to flexibly adjust the hollowness and warmth retention properties of the yarn.

[0004] The thermal insulation performance of yarn is determined by a variety of factors, and its principles can be mainly divided into two types: passive insulation, which improves the insulation of the fabric by blocking heat loss or increasing the amount of still air; and active insulation, which absorbs or stores energy in other forms such as solar, electrical, and chemical energy and converts it into heat to maintain the body's thermal balance. For passive insulation, materials with high specific surface area and high porosity, such as profiled fibers, fine denier fibers, down, kapok fibers, and aerogels, are commonly used. However, these materials still face challenges such as difficult spinning, complex manufacturing processes, and limited still air retention at the micro- and nano-scale. On the other hand, while using an air layer as insulation at the macroscopic level can achieve both lightweight and warmth, research shows that when relying solely on air layer insulation, excessive thickness (≥10 mm) can actually weaken its thermal insulation performance. Currently, research on constructing thermally insulating textiles based on hollow yarns, especially on the controllable adjustment of thermal insulation function, is still relatively limited.

[0005] Existing technologies have conducted considerable research in multi-axis spinning technology, mostly focusing on adjusting processes or equipment to produce functional yarns. For example, patent CN107217360B designs a gradient composite spinning mechanism that uses the periodic or variable-period movement of converging needles to synchronize with the tension of filaments or yarns, achieving the mutual wrapping of filaments or yarns with short fiber slivers, thus obtaining gradient yarns with varying colors, functional textures, and structural textures. Another example is the low-voltage driven electrochromic shape memory color-changing coated yarn disclosed in patent CN120041986B, which effectively integrates electrochromic and shape memory functions.

[0006] However, the application of multi-axis spinning technology to the precise control of yarn insulation performance, and the preparation of yarns with excellent insulation properties by adjusting the axis configuration and material selection, is still rarely reported both domestically and internationally. Furthermore, traditional methods may rely on chemical treatments to generate hollow structures, posing environmental pollution risks and contradicting the trend of green manufacturing.

[0007] Therefore, it is of great significance to study a method based on purely physical means that can precisely control the heat retention performance of ring-spun composite hollow yarn with hollow structure in order to solve the problems existing in the current technology. Summary of the Invention

[0008] The purpose of this invention is to solve the problems existing in the prior art and provide a method for controlling the heat retention performance of ring-spun composite hollow yarn.

[0009] A method for controlling the heat retention performance of ring-spun composite hollow yarn involves immersing a ring-spun composite yarn with a core layer of water-soluble vinylon filament and a covering layer of non-water-soluble short fibers in water at a certain temperature, so that the core layer of the ring-spun composite yarn is completely or partially dissolved, thereby obtaining ring-spun composite hollow yarn.

[0010] The heat retention performance of ring-spun composite hollow yarn can be controlled by adjusting the number of water-soluble vinylon filaments in the core layer of the ring-spun composite yarn and by using water-soluble vinylon filaments with the same or different dissolution temperatures.

[0011] The core layer of ring-spun composite yarn contains 1 to 3 water-soluble vinylon filaments, and the dissolution temperature of each water-soluble vinylon filament may be the same or different.

[0012] Theoretically, the higher the hollowness of the yarn, the more still air it can hold, thus improving its warmth retention. Theoretical analysis shows that increasing the number of core yarns (i.e., the core layer of water-soluble vinylon filaments) helps improve the control over the hollowness of the composite yarn. However, in ring spinning, when multiple core yarns are fed simultaneously, the difficulty of controlling their three-dimensional spatial distribution and trajectory within the final yarn increases significantly, especially under the condition of limited yarn diameter. Therefore, it is necessary to comprehensively optimize the number of core yarns to balance the hollow structure design and actual spinnability. To this end, this invention proposes controlling the number of core yarns fed in to 1-3, which ensures that each core yarn is spatially isolated within the yarn, avoiding mutual penetration. If too many core yarns are fed in, some core yarns are easily clustered together, thereby destroying their structural independence and making it difficult to achieve the desired effect of isolated distribution of core yarns.

[0013] The number of core layer water-soluble vinylon filaments fed in can be adjusted according to actual warmth requirements. The core layer water-soluble vinylon filaments can be of the same type (with the same dissolution temperature) or different types (with different dissolution temperatures). By precisely adjusting the dissolution temperature, the water-soluble vinylon filaments can be completely or partially dissolved, thereby enhancing the yarn's strength and other related properties while satisfying the warmth requirements.

[0014] The formation of hollow yarn is not completed directly during the spinning process, but rather after spinning is achieved through de-fiber treatment. This process removes the core layer of vinylon, ultimately forming a hollow structure. The hollowness ratio control in this invention is mainly achieved by changing the number of core yarns fed in (1≤n≤3) or by selecting different types of water-soluble vinylon filaments (i.e., core yarns with the same or different dissolution temperatures). For the same type of core yarn, as the number of core yarns fed in increases, the hollowness ratio inside the yarn can be effectively increased during the subsequent hot water treatment (i.e., de-fiber treatment). However, de-fiber treatment leads to a certain degree of decrease in the yarn's mechanical properties; if core yarns with different dissolution temperatures are used, it means combining different types of core yarns and selectively dissolving them, thus achieving a balance between increasing the hollowness ratio and maintaining the yarn's mechanical properties. The specific range of the hollowness ratio is significantly affected by factors such as the final yarn thickness, core yarn specifications, and spinning process. In this invention, the hollowness of the yarn is indirectly evaluated primarily through the thermal insulation performance of the fabric, and also indirectly characterized by the weight loss rate after de-fiber treatment. Currently, the thermal insulation effect of yarn is usually characterized in the form of fabric. In this invention, plain weave fabrics with the same warp and weft density are used as test samples. Theoretically, the more core yarns there are, the higher the hollowness of the yarn after de-fiber treatment, which is reflected in the higher weight loss rate and the stronger the thermal insulation performance of the corresponding fabric.

[0015] In this invention, by changing the number of core yarns n (1≤n≤3), the weight loss rate of the yarn is between 23% and 53%. After preparing it into a plain weave fabric, it is covered on a heating table for testing. The results show that the temperature fluctuation range of the covered area of ​​the fabric woven from ordinary yarn without de-fiber treatment and hollow structure is 3.5~4.5 ℃; while the fabric prepared from yarn with hollow structure obtained through de-fiber treatment exhibits significant warmth retention performance, with the temperature change range reduced to 1.5~3 ℃.

[0016] As a preferred technical solution:

[0017] The above-described method for controlling the heat retention performance of ring-spun composite hollow yarn uses water-soluble vinylon filaments with a fineness of 50~100 D and a dissolution temperature of 40~90 ℃.

[0018] The method for controlling the heat retention performance of ring-spun composite hollow yarn as described above involves a specific temperature range of 40~90 ℃.

[0019] The method for controlling the warmth retention of ring-spun composite hollow yarn as described above uses non-water-soluble short fibers such as pure cotton fibers, polyester fibers, polyester / cotton blended fibers, cotton / linen blended fibers, or linen / viscose blended fibers. Only some common types are listed here, but other non-water-soluble short fibers can also be applied to this invention.

[0020] The method for controlling the heat retention performance of ring-spun composite hollow yarn as described above involves producing a ring-spun composite hollow yarn with a weight of 150 g / m² when the core layer of the ring-spun composite yarn contains only one water-soluble vinylon filament and is completely dissolved. 2 After the plain weave fabric was covered, it was tested on a heating table. The heating table temperature was set to 40℃, the heating time was 1 min, and the temperature change range was 2.5~3℃. The smaller the temperature change range, the stronger the warmth retention performance of the fabric. In contrast, the temperature fluctuation range of the covered area of ​​the fabric woven from ring-spun composite yarn that has not undergone de-fiber treatment and does not have a hollow structure was 3.5~4.5℃.

[0021] When the core layer of the ring-spun composite yarn contains two water-soluble vinylon filaments that are completely dissolved, the resulting ring-spun composite hollow yarn is made with a basis weight of 150 g / m. 2 After the plain weave fabric was laid, it was covered on a heating table for testing. The heating table temperature was set to 40℃, the heating time was 1 min, and the temperature change range of the fabric was 2~2.5℃.

[0022] When the core layer of the ring-spun composite yarn contains two water-soluble vinylon filaments, and only one of them is dissolved (this can be achieved by using water-soluble vinylon filaments with different hydrolysis temperatures and controlling the water temperature), the resulting ring-spun composite hollow yarn can be made with a basis weight of 150 g / m². 2After the plain weave fabric was covered, it was placed on a heating table for testing. The heating table temperature was set to 40 ℃, the heating time was 1 min, and the temperature change range was 2.5~3 ℃.

[0023] When the core layer of the ring-spun composite yarn contains 3 water-soluble vinylon filaments that are completely dissolved, the resulting ring-spun composite hollow yarn is made with a basis weight of 150 g / m. 2 After the plain weave fabric was laid, it was covered on a heating table for testing. The heating table temperature was set to 40 ℃, the heating time was 1 min, and the temperature change range was 1.5~2 ℃.

[0024] When the core layer of the ring-spun composite yarn contains 3 water-soluble vinylon filaments, and only 1 of them is dissolved, the resulting ring-spun composite hollow yarn is made with a basis weight of 150 g / m. 2 After the plain weave fabric was covered, it was placed on a heating table for testing. The heating table temperature was set to 40 ℃, the heating time was 1 min, and the temperature change range was 2.5~3 ℃.

[0025] When the core layer of the ring-spun composite yarn contains 3 water-soluble vinylon filaments, and 2 of them are dissolved, the resulting ring-spun composite hollow yarn is made with a basis weight of 150 g / m. 2 After the plain weave fabric was laid, it was covered on a heating table for testing. The heating table temperature was set to 40 ℃, the heating time was 1 min, and the temperature change range was 2~2.5 ℃.

[0026] The above-described method for controlling the heat retention performance of ring-spun composite hollow yarn involves the following steps: First, two short fiber rovings are used as sheath layers and fed synchronously into a ring spinning machine at a fixed spacing (adjusted by a pair of bundled horns on the composite spinning device, which can move left and right to achieve precise adjustment of the distance between the two fed short fiber roving shafts). After being drafted by rollers, they reach the front roller nip, forming two independent and parallel straight short fiber slivers. Simultaneously, 1-3 water-soluble vinylon filaments are used as the core layer, passing over a micro-grooved roller mounted above the front roller and positioned at a preset position. The positioned water-soluble vinylon filaments are then conveyed to the front roller nip. When the sheath layer short fiber slivers and the core layer water-soluble vinylon filaments are output from the front roller nip together, they are twisted together to form a yarn, thus producing the ring-spun composite yarn.

[0027] The micro-grooved roller can precisely control the feeding position and feeding tension of the core layer water-soluble vinylon filament. The feeding tension is controlled by winding the yarn around the micro-grooved roller 0 to 3 times (0 turns means it is directly stuck in the groove). The groove width, groove depth, and groove spacing on the micro-grooved roller are 0.5 to 2.5 mm, and can be engraved as needed according to the thickness of the water-soluble vinylon filament being fed.

[0028] When there is one core water-soluble vinylon filament, the preset position is the symmetrical central axis of the two short fiber slivers on the left and right.

[0029] When there are two water-soluble vinylon filaments in the core layer, the preset positions are the central axis of the left short fiber sliver and the central axis of the right short fiber sliver.

[0030] When there are 3 water-soluble vinylon filaments in the core layer, the preset positions are the central axis of the left short fiber sliver, the central axis of the right short fiber sliver, and the symmetrical central axis of the two short fiber slivers.

[0031] The above-described method for controlling the heat retention performance of ring-spun composite hollow yarn has a roving weight of 400~500 tex, a ring spinning machine speed of 6500~8500 r / min, and a yarn twist coefficient of 300~500.

[0032] The above-described method for controlling the heat retention performance of ring-spun composite hollow yarn involves a beam spacing of 9-15 mm between the two short fiber rovings.

[0033] Beneficial effects:

[0034] (1) The present invention provides a method for controlling the heat retention performance of ring-spun composite hollow yarn. By flexibly controlling the number of water-soluble vinylon filaments fed in (1≤n≤3) and the type of water-soluble vinylon filaments fed in (different types of water-soluble vinylon filaments have different dissolution temperatures to achieve complete or partial dissolution), the yarn strength and other mechanical properties can be optimized while meeting different heat retention requirements. The partially retained core filaments (dissolution temperature lower than the dissolution threshold of the retained core layer) can enhance the stability of the yarn structure, achieve a balance between heat retention and mechanical properties, and expand the application scope of the yarn in high-performance textiles.

[0035] (2) The method for controlling the heat retention performance of ring-spun composite hollow yarn of the present invention only requires simple modification of the traditional ring spinning machine, such as adding micro-groove rollers and bundled horns, to achieve controllable preparation of multi-axis ring-spun composite hollow yarn with on-demand heat control characteristics; the spinning process is highly adaptable and easy to industrialize.

[0036] (3) The present invention provides a method for controlling the heat retention performance of a ring-spun composite hollow yarn. It uses a combination of core layer water-soluble vinylon filaments with different dissolution temperatures. Selective dissolution is achieved through temperature control, which can form a differentiated hollow structure in the same composite yarn and weave it into different parts of the garment as needed to achieve a heat retention effect as needed.

[0037] (4) The method for controlling the heat retention performance of ring-spun composite hollow yarn of the present invention uses a purely physical method to achieve the generation of hollow structure, without any chemical residue, and is green and environmentally friendly. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the yarn cross-section in Example 1; wherein, Figure (a) shows the yarn before de-fiber removal, and Figure (b) shows the yarn after de-fiber removal;

[0039] Figure 2 This is a schematic diagram of the yarn cross-section in Example 5; wherein, Figure (a) shows the yarn before de-fiber removal, and Figure (b) shows the yarn after de-fiber removal;

[0040] Figure 3 This is a schematic diagram of the yarn cross-section in Example 7; wherein, Figure (a) shows the yarn before de-fiber removal, and Figure (b) shows the yarn after de-fiber removal;

[0041] Figure 4 This is a schematic diagram of the yarn cross-section in Example 8; wherein, Figure (a) shows the yarn before de-fiber removal, and Figure (b) shows the yarn after de-fiber removal;

[0042] Figure 5 This is a schematic diagram of the spinning process for a method to control the warmth retention of a ring-spun composite hollow yarn (the core layer is exactly the same).

[0043] Figure 6 This is a schematic diagram of the spinning process for a method to control the warmth retention of ring-spun composite hollow yarn (the core layer is not exactly the same).

[0044] Figure 7 The image shows the appearance of the ring-spun composite hollow yarn containing one core yarn in Example 7 (Fig. (a)) and the appearance of the covering layer after manual peeling (Fig. (b)).

[0045] Figure 8 The image shows the appearance of the ring-spun composite hollow yarn containing 3 core yarns in Example 1 (Fig. (a)) and the appearance of the covering layer after manual peeling (Fig. (b)).

[0046] Figure 9 The morphology of the ring-spun composite hollow yarn containing one core yarn woven into a fabric in Example 3 before and after de-fiber removal is shown; wherein, Figure (a) is before de-fiber removal and Figure (b) is after de-fiber removal.

[0047] Figure 10 Temperature change graphs for heating tests performed on fabrics woven from yarns before and after de-fiber removal in the blank group and Example 1.

[0048] Among them, 1-Short fiber roving I; 2-Short fiber roving II; 3-Bubbled trumpet I; 4-Bubbled trumpet II; 5-Water-soluble vinylon filament I; 6-Water-soluble vinylon filament II; 7-Water-soluble vinylon filament III; 8-Micro-groove roller; 9-Front roller; 10-Ring-spun composite yarn. Detailed Implementation

[0049] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0050] The testing methods involved in the performance indicators of this invention are as follows:

[0051] Weight loss rate: Ring-spun composite hollow yarn woven to a weight of 150 g / m 2 After the plain weave fabric is dried, it is weighed. Based on the dissolution temperature of the vinylon filaments to be dissolved, a de-fiber treatment is performed. After dissolution, the fabric is thoroughly dried and weighed again, and the weight after de-fiber treatment is recorded. Finally, the weight of the fabric before de-fiber treatment is subtracted from the weight of the fabric after de-fiber treatment, and compared with the weight of the fabric before de-fiber treatment; this is the weight loss rate. The weight loss rate measures the hollowness; generally, the higher the weight loss rate, the higher the hollowness.

[0052] Example 1

[0053] A method for controlling the warmth retention performance of ring-spun composite hollow yarn, the specific steps of which are as follows:

[0054] (1) Preparation of materials:

[0055] Short fiber: pure cotton fiber;

[0056] Water-soluble vinylon filament: specification 55 D / 15F, dissolution temperature 55 ℃;

[0057] (2) Preparation of ring-spun composite yarn using a composite spinning device:

[0058] like Figure 5 As shown, the composite spinning device consists of a ring spinning machine, rollers, front roller 9, microgrooved rollers 8 with built-in bearings, and a pair of bundled horns; the pair of bundled horns are bundled horn I 3 and bundled horn II 4.

[0059] The specific preparation process is as follows: First, two short fiber rovings (i.e., short fiber roving I 1 and short fiber roving II 2) are fed into the ring spinning machine simultaneously at a spacing of 12 mm as sheath layers. After being drafted by the rollers, they reach the front roller nip, forming two independent and parallel straight short fiber slivers. At the same time, three water-soluble vinylon filaments (i.e., water-soluble vinylon filament I 5, water-soluble vinylon filament II 6, and water-soluble vinylon filament III) are added. 7) As the core layer, it passes over the micro-grooved roller 8 installed above the front roller 9 and is positioned at a preset position. The preset position is the central axis of the left short fiber sliver, the central axis of the right short fiber sliver, and the symmetrical central axis of the two short fiber slivers. The positioned water-soluble vinylon filament is then conveyed to the front roller nip. After the sheath layer short fiber sliver and the core layer water-soluble vinylon filament are output from the front roller nip, they are twisted together to form a yarn, thus producing the ring-spun composite yarn 10.

[0060] The process parameters are as follows: the groove width on the micro-groove roller is 1 mm, the groove depth is 1 mm, and the groove spacing is 1 mm; the roving weight is 465 tex, the spindle speed of the ring spinning machine is 7500 r / min, and the yarn twist coefficient is 375.

[0061] (3) Immerse the ring-spun composite yarn in water at 55 ℃ to completely dissolve the core layer of the ring-spun composite yarn, to obtain the following: Figure 8 The ring-spun composite hollow yarn shown is shown.

[0062] like Figure 1 As shown, the core layer of the ring-spun composite yarn contains 3 water-soluble vinylon filaments that are completely dissolved. The resulting ring-spun composite hollow yarn is then processed to achieve a basis weight of 150 g / m². 2 After the plain weave fabric was covered, it was tested on a heating table. The temperature change range was 1.8 ℃, and the weight loss rate was 53%.

[0063] like Figure 10 As shown, the temperature of the heating platform was set to 40℃ and maintained at that temperature for 1 minute, after which the heating platform was turned off. Different groups of samples (including blank group, before and after de-fiber) were laid flat on the heating platform in sequence, the heating platform was turned on, and each group of samples was heated for 1 minute.

[0064] The research results show that fabrics without de-fiber treatment exhibit relatively large temperature variations, indicating relatively weak warmth retention. Fabrics treated with de-fiber treatment, however, show significantly reduced temperature variations, demonstrating a substantial improvement in their warmth retention. This demonstrates the feasibility of this spinning technology in improving the warmth retention of yarn products.

[0065] Example 2

[0066] A method for controlling the warmth retention performance of ring-spun composite hollow yarn, the specific steps of which are as follows:

[0067] (1) Preparation of materials:

[0068] Short fiber: 65 / 35 polyester / cotton blended fiber;

[0069] Water-soluble vinylon filament: specification 55 D / 15F, dissolution temperature 55 ℃;

[0070] (2) Preparation of ring-spun composite yarn using a composite spinning device:

[0071] The composite spinning device consists of a ring spinning machine, rollers, front rollers, microgrooved rollers with built-in bearings, and a pair of bundled horns;

[0072] The specific preparation process is as follows: First, two short fiber rovings are fed into the ring spinning machine simultaneously at a 9 mm interval as sheath layers. After being drafted by the rollers, they reach the front roller nip, forming two independent and parallel straight short fiber slivers. At the same time, three water-soluble vinylon filaments are used as the core layer, passing over the micro-grooved rollers installed above the front rollers and positioned at preset positions. The preset positions are the central axis of the left short fiber sliver, the central axis of the right short fiber sliver, and the symmetrical central axis of the two short fiber slivers. The positioned water-soluble vinylon filaments are then conveyed to the front roller nip. When the sheath layer short fiber slivers and the core layer water-soluble vinylon filaments are output from the front roller nip, they are twisted together to form a composite yarn, thus producing a ring-spun composite yarn.

[0073] The process parameters are as follows: the groove width on the micro-groove roller is 1.5 mm, the groove depth is 1.5 mm, and the groove spacing is 1.5 mm; the roving weight is 465 tex, the spindle speed of the ring spinning machine is 6500 r / min, and the yarn twist coefficient is 390.

[0074] (3) Immerse the ring-spun composite yarn in water at 55 ℃ to completely dissolve the core layer of the ring-spun composite yarn to obtain ring-spun composite hollow yarn.

[0075] The core layer of the ring-spun composite yarn contains three water-soluble vinylon filaments that are completely dissolved. The resulting ring-spun composite hollow yarn is then processed to achieve a basis weight of 150 g / m². 2 After the plain weave fabric was covered, it was tested on a heating table. The temperature change range was 1.9 ℃ and the weight loss rate was 51%.

[0076] Example 3

[0077] A method for controlling the warmth retention performance of ring-spun composite hollow yarn, the specific steps of which are as follows:

[0078] (1) Preparation of materials:

[0079] Short fiber: polyester fiber;

[0080] Water-soluble vinylon filament: specification 50 D / 15F, dissolution temperature 70 ℃;

[0081] (2) Preparation of ring-spun composite yarn using a composite spinning device:

[0082] The composite spinning device consists of a ring spinning machine, rollers, front rollers, microgrooved rollers with built-in bearings, and a pair of bundled horns;

[0083] The specific preparation process is as follows: First, two short fiber rovings are fed into the ring spinning machine simultaneously at a 10 mm interval as sheath layers. After being drafted by the rollers, they reach the front roller nip, forming two independent and parallel straight short fiber slivers. At the same time, a water-soluble vinylon filament is used as the core layer, passing over the micro-grooved roller installed above the front roller and positioned at a preset position. The preset position is the symmetrical central axis of the two short fiber slivers. The positioned water-soluble vinylon filament is then conveyed to the front roller nip. When the sheath layer short fiber slivers and the core layer water-soluble vinylon filament are output from the front roller nip together, they are twisted together to form a yarn, thus producing a ring-spun composite yarn.

[0084] The process parameters are as follows: the groove width on the micro-groove roller is 0.5 mm, the groove depth is 0.5 mm, and the groove spacing is 0.5 mm; the roving weight is 400 tex, the spindle speed of the ring spinning machine is 8500 r / min, and the yarn twist coefficient is 500.

[0085] (3) Immerse the ring-spun composite yarn in water at 70°C to completely dissolve the core layer of the ring-spun composite yarn to obtain ring-spun composite hollow yarn.

[0086] The core layer of the ring-spun composite yarn contains only one water-soluble vinylon filament, which is completely dissolved. Figure 9 The ring-spun composite hollow yarn shown has a basis weight of 150 g / m². 2 After the plain weave fabric was covered, it was tested on a heating table. The temperature change range was 2.8 ℃ and the weight loss rate was 23%.

[0087] Example 4

[0088] A method for controlling the warmth retention performance of ring-spun composite hollow yarn, the specific steps of which are as follows:

[0089] (1) Preparation of materials:

[0090] Short fiber: 70 / 30 linen / viscose blend;

[0091] Water-soluble vinylon filament: specification 55 D / 15F, dissolution temperature 55 ℃;

[0092] (2) Preparation of ring-spun composite yarn using a composite spinning device:

[0093] The composite spinning device consists of a ring spinning machine, rollers, front rollers, microgrooved rollers with built-in bearings, and a pair of bundled horns;

[0094] The specific preparation process is as follows: First, two short fiber rovings are fed into the ring spinning machine simultaneously at a 12 mm interval as sheath layers. After being drafted by the rollers, they reach the front roller nip, forming two independent and parallel straight short fiber slivers. At the same time, three water-soluble vinylon filaments are used as the core layer, passing over the micro-grooved rollers installed above the front rollers and positioned at preset positions. The preset positions are the central axis of the left short fiber sliver, the central axis of the right short fiber sliver, and the symmetrical central axis of the two short fiber slivers. The positioned water-soluble vinylon filaments are then conveyed to the front roller nip. When the sheath layer short fiber slivers and the core layer water-soluble vinylon filaments are output from the front roller nip, they are twisted together to form a composite yarn, thus producing a ring-spun composite yarn.

[0095] The process parameters are as follows: the groove width on the micro-groove roller is 2.5 mm, the groove depth is 2.5 mm, and the groove spacing is 2.5 mm; the roving weight is 500 tex, the spindle speed of the ring spinning machine is 7000 r / min, and the yarn twist coefficient is 375.

[0096] (3) Immerse the ring-spun composite yarn in water at 55 ℃ to completely dissolve the core layer of the ring-spun composite yarn to obtain ring-spun composite hollow yarn.

[0097] The core layer of the ring-spun composite yarn contains three water-soluble vinylon filaments that are completely dissolved. The resulting ring-spun composite hollow yarn is then processed to achieve a basis weight of 150 g / m². 2 After the plain weave fabric was covered, it was tested on a heating table with a temperature change range of 1.5 ℃ and a weight loss rate of 48%.

[0098] Example 5

[0099] A method for controlling the warmth retention performance of ring-spun composite hollow yarn, the specific steps of which are as follows:

[0100] (1) Preparation of materials:

[0101] Short fiber: polyester fiber;

[0102] Water-soluble vinylon filament I: Specification 100 D / 15F, dissolution temperature 90 ℃;

[0103] Water-soluble vinylon filament II: Specification 100 D / 15F, dissolution temperature 90 ℃;

[0104] Water-soluble vinylon filament III: Specification 50 D / 15F, dissolution temperature 40 ℃;

[0105] (2) Preparation of ring-spun composite yarn using a composite spinning device:

[0106] like Figure 6 As shown, the composite spinning device consists of a ring spinning machine, rollers, front roller 9, microgrooved rollers 8 with built-in bearings, and a pair of bundled horns; the pair of bundled horns are bundled horn I 3 and bundled horn II 4.

[0107] The specific preparation process is as follows: First, two short fiber rovings (i.e., short fiber roving I 1 and short fiber roving II 2) are fed into the ring spinning machine at a 10 mm interval as sheath layers. After being drafted by the rollers, they reach the front roller nip, forming two independent and parallel straight short fiber slivers. At the same time, three water-soluble vinylon filaments (i.e., water-soluble vinylon filament I 5, water-soluble vinylon filament II 6, and water-soluble vinylon filament III) are added. 7) As the core layer, it passes over the micro-grooved roller 8 installed above the front roller 9 and is positioned at a preset position. The preset position is the central axis of the left short fiber sliver, the central axis of the right short fiber sliver, and the symmetrical central axis of the two short fiber slivers. The positioned water-soluble vinylon filament is then conveyed to the front roller nip. After the sheath layer short fiber sliver and the core layer water-soluble vinylon filament are output from the front roller nip, they are twisted together to form a yarn, thus producing the ring-spun composite yarn 10.

[0108] The process parameters are as follows: the groove width on the micro-groove roller is 2 mm, the groove depth is 2 mm, and the groove spacing is 2 mm; the roving weight is 480 tex, the spindle speed of the ring spinning machine is 8500 r / min, and the yarn twist coefficient is 465.

[0109] (3) Immerse the ring-spun composite yarn in water at 40 °C to dissolve the core layer of the ring-spun composite yarn and obtain the ring-spun composite hollow yarn.

[0110] like Figure 2 As shown, the core layer of the ring-spun composite yarn contains 3 water-soluble vinylon filaments, and only 1 of them is dissolved. The resulting ring-spun composite hollow yarn is then processed to achieve a basis weight of 150 g / m². 2 After the plain weave fabric was covered, it was tested on a heating table. The temperature change range was 2.7 ℃ and the weight loss rate was 25%.

[0111] Example 6

[0112] A method for controlling the warmth retention performance of ring-spun composite hollow yarn, the specific steps of which are as follows:

[0113] (1) Preparation of materials:

[0114] Short fiber: 50 / 50 cotton / viscose blend;

[0115] Water-soluble vinylon filament I: Specification 100 D / 15F, dissolution temperature 90 ℃;

[0116] Water-soluble vinylon filament II: Specification 55 D / 15F, dissolution temperature 40 ℃;

[0117] Water-soluble vinylon filament III: Specification 55 D / 15F, dissolution temperature 40 ℃;

[0118] (2) Preparation of ring-spun composite yarn using a composite spinning device:

[0119] The composite spinning device consists of a ring spinning machine, rollers, front rollers, microgrooved rollers with built-in bearings, and a pair of bundled horns;

[0120] The specific preparation process is as follows: First, two short fiber rovings are fed into the ring spinning machine simultaneously at a spacing of 13 mm as sheath layers. After being drafted by the rollers, they reach the front roller nip, forming two independent and parallel straight short fiber slivers. At the same time, three water-soluble vinylon filaments (i.e., water-soluble vinylon filament I, water-soluble vinylon filament II, and water-soluble vinylon filament III) are used as the core layer, passing over the micro-grooved rollers installed above the front rollers and positioned at preset positions. The preset positions are the central axis of the left short fiber sliver, the central axis of the right short fiber sliver, and the symmetrical central axis of the two short fiber slivers. The positioned water-soluble vinylon filaments are then conveyed to the front roller nip. When the sheath layer short fiber slivers and the core layer water-soluble vinylon filaments are output from the front roller nip, they are twisted together to form a composite yarn, thus producing a ring-spun composite yarn.

[0121] The process parameters are as follows: the groove width on the micro-groove roller is 1.5 mm, the groove depth is 1.5 mm, and the groove spacing is 1.5 mm; the roving weight is 450 tex, the spindle speed of the ring spinning machine is 7000 r / min, and the yarn twist coefficient is 410.

[0122] (3) Immerse the ring-spun composite yarn in water at 40 °C to dissolve the core layer of the ring-spun composite yarn and obtain the ring-spun composite hollow yarn.

[0123] When the core layer of the ring-spun composite yarn contains 3 water-soluble vinylon filaments, and 2 of them are dissolved, the resulting ring-spun composite hollow yarn can be made with a basis weight of 150 g / m. 2 After the plain weave fabric was covered, it was tested on a heating table. The temperature change range was 2.9 ℃ and the weight loss rate was 40%.

[0124] Example 7

[0125] A method for controlling the warmth retention performance of ring-spun composite hollow yarn, the specific steps of which are as follows:

[0126] (1) Preparation of materials:

[0127] Short fiber: 70 / 30 cotton / linen blend;

[0128] Water-soluble vinylon filament I: Specification 100 D / 15F, dissolution temperature 90 ℃;

[0129] (2) Preparation of ring-spun composite yarn using a composite spinning device:

[0130] The composite spinning device consists of a ring spinning machine, rollers, front rollers, microgrooved rollers with built-in bearings, and a pair of bundled horns;

[0131] The specific preparation process is as follows: First, two short fiber rovings are fed into the ring spinning machine at a 15 mm interval as sheath layers. After being drafted by the rollers, they reach the front roller nip to form two independent and parallel straight short fiber slivers. At the same time, a water-soluble vinylon filament is used as the core layer, passing over the micro-grooved roller installed above the front roller and positioned at a preset position. The preset position is the symmetrical central axis of the two short fiber slivers. The positioned water-soluble vinylon filament is then conveyed to the front roller nip. When the sheath layer short fiber sliver and the core layer water-soluble vinylon filament are output from the front roller nip together, they are twisted together to form a yarn, thus producing a ring-spun composite yarn.

[0132] The process parameters are as follows: the groove width on the micro-groove roller is 2 mm, the groove depth is 2 mm, and the groove spacing is 2 mm; the roving weight is 460 tex, the spindle speed of the ring spinning machine is 6500 r / min, and the yarn twist coefficient is 300.

[0133] (3) Immerse the ring-spun composite yarn in water at 90 ℃ to completely dissolve the core layer of the ring-spun composite yarn, to obtain the following: Figure 7 The ring-spun composite hollow yarn shown is shown.

[0134] like Figure 3 As shown, the core layer of the ring-spun composite yarn contains one water-soluble vinylon filament, which is completely dissolved. The resulting ring-spun composite hollow yarn is then processed to achieve a basis weight of 150 g / m². 2 After the plain weave fabric was covered, it was tested on a heating table. The temperature change range was 1.7 ℃ and the weight loss rate was 28%.

[0135] Example 8

[0136] A method for controlling the warmth retention performance of ring-spun composite hollow yarn, the specific steps of which are as follows:

[0137] (1) Preparation of materials:

[0138] Short fiber: pure cotton fiber;

[0139] Water-soluble vinylon filament: specification 50 D / 15F, dissolution temperature 40 ℃;

[0140] (2) Preparation of ring-spun composite yarn using a composite spinning device:

[0141] The composite spinning device consists of a ring spinning machine, rollers, front rollers, microgrooved rollers with built-in bearings, and a pair of bundled horns;

[0142] The specific preparation process is as follows: First, two short fiber rovings are fed into the ring spinning machine simultaneously at a 12 mm interval as sheath layers. After being drafted by the rollers, they reach the front roller nip, forming two independent and parallel straight short fiber slivers. At the same time, two water-soluble vinylon filaments are used as the core layer, passing over the micro-grooved rollers installed above the front rollers and positioned at preset positions. The preset positions are the central axes of the left and right short fiber slivers. The positioned water-soluble vinylon filaments are then conveyed to the front roller nip. When the sheath layer short fiber slivers and the core layer water-soluble vinylon filaments are output from the front roller nip together, they are twisted together to form a composite yarn, thus producing a ring-spun composite yarn.

[0143] The process parameters are as follows: the groove width on the micro-groove roller is 1 mm, the groove depth is 1 mm, and the groove spacing is 1 mm; the roving weight is 435 tex, the spindle speed of the ring spinning machine is 7500 r / min, and the yarn twist coefficient is 400.

[0144] (3) Immerse the ring-spun composite yarn in water at 40 ℃ to completely dissolve the core layer of the ring-spun composite yarn to obtain ring-spun composite hollow yarn.

[0145] like Figure 4 As shown, the core layer of the ring-spun composite yarn contains two water-soluble vinylon filaments that are completely dissolved. The resulting ring-spun composite hollow yarn is then processed to achieve a basis weight of 150 g / m². 2 After the plain weave fabric was covered, it was tested on a heating table. The temperature change range was 2.4 ℃ and the weight loss rate was 38%.

Claims

1. A method for controlling the warmth retention performance of ring-spun composite hollow yarn, characterized in that: Ring-spun composite yarn with a core layer of water-soluble vinylon filament and a covering layer of non-water-soluble short fiber is immersed in water at a certain temperature to dissolve the core layer of the ring-spun composite yarn, thus obtaining ring-spun composite hollow yarn. The heat retention performance of ring-spun composite hollow yarn can be controlled by adjusting the number of water-soluble vinylon filaments in the core layer of the ring-spun composite yarn and by using water-soluble vinylon filaments with different dissolution temperatures. The core layer of ring-spun composite yarn contains 2 to 3 water-soluble vinylon filaments, and each water-soluble vinylon filament has a different dissolution temperature. The preparation method of ring-spun composite yarn is as follows: First, two short fiber rovings are fed into the ring spinning machine at a fixed interval as sheath layers. After being drafted by the rollers, they reach the front roller nip to form two independent and parallel straight short fiber slivers. At the same time, 2-3 water-soluble vinylon filaments are used as the core layer, passing over the micro-grooved rollers installed above the front roller and positioned in a preset position. The positioned water-soluble vinylon filaments are then conveyed to the front roller nip. When the sheath layer short fiber slivers and the core layer water-soluble vinylon filaments are output from the front roller nip together, they are twisted together to form a yarn, thus producing the ring-spun composite yarn. The groove width on the micro-grooved roller is 0.5~2.5 mm, the groove depth is 0.5~2.5 mm, and the groove spacing is 0.5~2.5 mm; When there are two water-soluble vinylon filaments in the core layer, the preset positions are the central axis of the left short fiber sliver and the central axis of the right short fiber sliver. When there are 3 water-soluble vinylon filaments in the core layer, the preset positions are the central axis of the left short fiber sliver, the central axis of the right short fiber sliver, and the symmetrical central axis of the two short fiber slivers.

2. The method for controlling the warmth retention performance of ring-spun composite hollow yarn according to claim 1, characterized in that, The fineness of water-soluble vinylon filament is 50~100 D, and the dissolution temperature is 40~90 ℃.

3. The method for controlling the warmth retention performance of ring-spun composite hollow yarn according to claim 1, characterized in that, The specific temperature range is 40~90℃.

4. The method for controlling the warmth retention performance of ring-spun composite hollow yarn according to claim 1, characterized in that, Non-water-soluble staple fibers include pure cotton fibers, polyester fibers, polyester / cotton blended fibers, cotton / linen blended fibers, or linen / viscose blended fibers.

5. The method for controlling the warmth retention performance of ring-spun composite hollow yarn according to claim 1, characterized in that, When the core layer of the ring-spun composite yarn contains two water-soluble vinylon filaments, and only one of them is dissolved, the resulting ring-spun composite hollow yarn is made with a basis weight of 150 g / m². 2 After the plain weave fabric was covered, it was placed on a heating table at 40 ℃ for 1 min to test its heat preservation performance, with a temperature change range of 2.5~3 ℃. When the core layer of the ring-spun composite yarn contains 3 water-soluble vinylon filaments, and only 1 of them is dissolved, the resulting ring-spun composite hollow yarn is made with a basis weight of 150 g / m. 2 After the plain weave fabric was covered, it was placed on a heating table at 40 ℃ for 1 min to test its heat preservation performance, with a temperature change range of 2.5~3 ℃. When the core layer of the ring-spun composite yarn contains 3 water-soluble vinylon filaments, and 2 of them are dissolved, the resulting ring-spun composite hollow yarn is made with a basis weight of 150 g / m. 2 After the plain weave fabric was covered, it was placed on a heating table at 40 ℃ for 1 min to test its heat preservation performance, with a temperature change range of 2~2.5 ℃.

6. The method for controlling the warmth retention performance of ring-spun composite hollow yarn according to claim 1, characterized in that, The roving weight is 400~500 tex, the spindle speed of the ring spinning machine is 6500~8500 r / min, and the yarn twist coefficient is 300~500.

7. The method for controlling the warmth retention performance of ring-spun composite hollow yarn according to claim 1, characterized in that, The distance between the axes of the two short fiber rovings is 9~15 mm.

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