CN111394859A - Moisture absorption and heat generation fabric and its weaving method - Google Patents

Abstract

The invention relates to a moisture-absorbing uniform and slow heating fabric and a weaving method thereof, wherein the moisture-absorbing uniform and slow heating fabric is a moisture-absorbing uniform and slow heating fabric which is woven by adopting knitting, weaving, non-weaving technology or multilayer sewing technology and has a three-layer structure, and the three-layer structure consists of an inner layer, a middle layer and an outer layer; the inner layer has the function of diffusion and moisture conduction, the middle layer has the function of moisture absorption and storage, and the moisture absorption capacity and the liquid moisture diffusion speed of the middle layer are both between the inner layer and the outer layer; the outer layer has the functions of moisture absorption and heat generation; the temperature rise rate of the moisture-absorbing uniform and slow heating fabric woven by the invention to reach the highest temperature rise value is less than 1 ℃/min, the time of the fabric to reach the highest temperature rise value lags behind by 1-3 minutes compared with weft plain knitted fabrics woven by similar moisture-absorbing heating blended yarns, and the heat retention time of the fabric is 21-25 min; under the same humidification condition, the heating area of the moisture absorption uniform slow-heating fabric is more than 5% more than that of a weft plain knitted fabric woven by the same moisture absorption heating blended yarn.

Description

Moisture absorption and heat generation fabric and its weaving method

technical field

The invention belongs to the technical field of weaving, and relates to a fabric that absorbs moisture and slows heat generation and a weaving method thereof.

Background technique

With the development of science and technology and the improvement of living standards, people's requirements for the practical functions of fabrics and clothing tend to be diversified. By people's attention and love, it can meet the multiple requirements of people's winter clothing comfort, functionality and aesthetics. According to the test data, when people exercise, a large amount of sweat is excreted, both liquid and gaseous, and the amount is about 100g/m ² ·h, while the water evaporated through the skin at rest is about 15g/m ² · h h; Therefore, the human body produces a large amount of latent sweat even if it does not exercise. The heating power of the hygroscopic heating fiber comes from the adsorption of moisture, so this kind of fiber material can interact with human sweat to generate heat, so as to meet the functional requirements of the human body for the heat and humidity comfort of clothing.

The realization of the function of heating fabrics in the current hygroscopic heating products in China mainly achieves heating effect from the aspect of raw material selection, and achieves thermal insulation effect from the aspect of fabric structure design. The invention patent of application number CN201610080946.2 discloses a moisture-absorbing and heating fabric, which is woven from bottom to top by a fleece layer, a connecting layer and a surface layer yarn, the structure design is simple, and the organizational structure between the layers is connected. It is more compact, one side of the fabric is smooth and brushed, and the other side is brushed with vertical threads. When wearing, the vertical thread structure of the fleece layer is elastic and soft to fit the human body, and the ultra-fine denier in the fleece layer is bulky. Acrylic fiber and long-staple cotton have better moisture absorption and heat generation effect, so that the maximum temperature rise of moisture absorption and heat generation of fabrics is 7.1℃, and the average moisture absorption and heat generation temperature rise within 30min is 3.4℃. As people's requirements for the functionality and comfort of fabrics are getting higher and higher, fabrics that combine the functions of unidirectional moisture-absorbing and quick-drying and moisture-absorbing and heating functions have appeared one after another. The patent with the application number CN201610785867.1 discloses a unidirectional moisture-conducting, moisture-absorbing and exothermic knitted fabric and a preparation method thereof. By forming a differential wicking fabric structure with a certain humidity gradient in the inner layer, the middle layer and the outer layer, it is beneficial to moisture The inner and outer layers are woven from yarns with a certain moisture absorption and heating function, so that a large amount of differential heat and integral heat is generated during the process of moisture transfer inside and outside, so as to achieve the effect of moisture absorption, heat generation, quick drying and warmth retention. The maximum temperature rise of moisture absorption and heat generation of this kind of fabric is 7.9℃, and the average temperature rise of moisture absorption and heat generation within 30 minutes is 4.1℃. Although the index values of these hygroscopic and heating fabrics have all met the requirements of the national standard (the maximum temperature rise of hygroscopic heating is ≥4°C, and the average temperature rise of hygroscopic heating within 30 minutes is ≥3°C), the maximum temperature rise of these fabrics is the same as that within 30 minutes. The difference of the average temperature rise index reaches 3 to 4 °C, indicating that the uniformity and stability of the cloth surface temperature rise during the entire moisture absorption and heating process are poor, and the temperature rise value of 7 °C is not conducive to the human body's requirements for heat and humidity comfort in clothing.

Generally speaking, any material with certain hygroscopicity can absorb moisture and generate heat. According to GB/T 29866-2013, the moisture absorption and heating effect indicators of fabrics have the highest temperature rise and 30min average temperature rise, but the moisture absorption determined by these two indicators Heat-generating fabrics cannot reflect the heat and humidity comfort of clothing. The distribution of sweat on the surface of the human body is not uniform, and the heating power of the hygroscopic heating fabric comes from the adsorption of water molecules. Therefore, the uneven temperature change caused by the uneven moisture absorption of the fabric in a unit time will make the human body feel hot and cold. Discomfort is not conducive to the human body's own requirements for thermal and humid comfort of clothing.

Therefore, it is of great significance to develop a fabric that can effectively reduce the rate of change of temperature rise after the fabric absorbs moisture and increase the overall heat-generating area of the fabric.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a moisture-absorbing and heat-generating fabric and a weaving method thereof. The fabric adopts the design method of multi-layer fabric structure and the optimized application of different functional fibers. By controlling the transmission of moisture on the fabric surface, the fabric can be endowed with the comprehensive functions of diffusion and moisture conduction, moisture absorption and moisture storage, and moisture absorption and heat generation, and finally achieves the moisture absorption of the fabric. Gentle heat effect.

In order to achieve the above object, the technical scheme adopted in the present invention is:

Moisture absorption and heat generation fabric, which is a three-layer fabric consisting of an inner layer, a middle layer and an outer layer; the inner layer, the middle layer and the outer layer are independently selected from a knitted structure, a woven structure or a non-woven structure ;

The inner layer has the function of diffusion and moisture conduction, which plays the role of rapid diffusion and conduction of water, and increases the diffusion area of water in the plane; its rapid diffusion and conduction is expressed as the diffusion speed of liquid water is greater than 1mm/s;

The middle layer has the function of absorbing moisture and storing moisture, which partially intercepts and stores the water conducted from the inner layer to the middle layer, and has the function of increasing the free movement of water and relieving a large amount of water in the inner layer from directly reaching the outer layer to absorb moisture and generate heat; The moisture absorption capacity is between the inner layer and the outer layer, specifically expressed as the fiber moisture regain of the middle layer is 8% to 12.5%; the liquid moisture diffusion rate is between the inner layer and the outer layer;

The outer layer has the function of moisture absorption and heat generation, which can rapidly diffuse and conduct the moisture passing through the inner layer and the middle layer and absorb moisture to release heat, so as to achieve the effect of moisture absorption and heat generation; its rapid diffusion and conduction is expressed as the diffusion speed of liquid moisture is greater than 1.5mm/ s; its hygroscopic heat generation conforms to GB/T 29866-2013, which means that the maximum temperature rise is not less than 4°C, and the average temperature rise within 30 minutes is not less than 3°C;

For the moisture-absorbing and heating fabric, the effect of moisture-absorbing and heating is expressed as the maximum temperature rise is 4.5 to 7°C, the average temperature rise within 30 minutes is 3.2 to 4°C, and the temperature rise rate reaching the maximum temperature rise is less than 1°C/min, and the fabric reaches Compared with the weft plain knitted fabric woven by the same kind of hygroscopic and exothermic blended yarn, the time of maximum temperature rise is 1-3 minutes behind, and the heat retention time is 21-25min; The appreciation value is slightly lower than that of the weft jersey woven by the same kind of hygroscopic and exothermic blended yarn, and its heating area is more than 5% larger than that of the weft jersey woven by the same kind of hygroscopic and exothermic blended yarn.

The index values of the moisture-absorbing and heat-generating fabric of the present invention conform to the existing national standards. The heating area is characterized.

As the preferred technical solution:

The above-mentioned moisture absorption and heat generation fabric, the inner layer is made of a special-shaped cross-section filament, a composite yarn containing a special-shaped cross-section filament, or a non-woven fabric sheet containing a special-shaped cross-section long filament;

The middle layer is made of pure spun yarn, blended yarn or non-woven fabric;

The outer layer is made of a blended yarn or a non-woven fabric sheet containing hygroscopic heat-generating fibers.

As for the above-mentioned moisture-absorbing and heat-generating fabric, the composite yarn containing filaments with special-shaped cross-sections refers to the yarns that are blended with the filaments with special-shaped cross-sections and A fibers; the non-woven fabrics containing filaments with special-shaped cross-sections Sheet refers to a non-woven fabric sheet formed by uniformly mixing filaments with special-shaped cross-section and A fibers; the special-shaped cross-section is cross-shaped, Y-shaped or "king" shape;

The special-shaped section filament is a special-shaped section polyester filament or a special-shaped section polyamide filament;

The A fiber is one or more of cotton fiber, wool fiber, polyester fiber, polyamide fiber, viscose fiber, Lenzing fiber, cupro fiber and modal fiber;

According to the weight percentage, the special-shaped section filaments account for 40% to 80%.

The above-mentioned moisture absorption and heat generation fabric, the pure spun yarn, blended yarn or non-woven fabric sheet in the middle layer is made of cotton fiber, wool fiber, viscose fiber, Lenzing fiber, cupro fiber, modal fiber, One or more compositions of polyamide fibers and polyester fibers.

For the above-mentioned hygroscopic and heat-generating fabric, the blended yarn or non-woven fabric containing hygroscopic and heat-generating fibers is made by blending or mixing hygroscopic and heat-generating fibers with C fibers; according to the percentage by weight, the blended yarn containing hygroscopic and heat-generating fibers In the thread or non-woven fabric, the moisture absorbing and heating fibers account for 10% to 40%;

Described C fiber is one or more of cotton fiber, wool fiber, viscose fiber, Lenzing fiber, cupro fiber and modal fiber;

The moisture-absorbing and heating fibers refer to modified polyacrylonitrile fibers, modified polyacrylate fibers, modified polyacrylate fibers or modified protein viscose fibers;

The modification refers to introducing hydrophilic groups into the macromolecular chains of polyacrylonitrile fibers, polyacrylate fibers, polyacrylate fibers or protein viscose fibers by utilizing the mechanism of moisture absorption and heat generation of fiber materials.

For the above-mentioned hygroscopic and heat-generating fabric, the hygroscopicity of the inner layer, the middle layer and the outer layer is in order: outer layer>intermediate layer>inner layer, that is, the hygroscopicity between the inner and outer fabric layers and the layers gradually increase.

The present invention also provides a method for weaving the above-mentioned moisture-absorbing and slow-generating fabric, which adopts knitting, weaving, non-woven technology or multi-layer stitching technology to weave the three-layer structure of the moisture-absorbing and heat-generating fabric;

The three-layer structure includes one or more of a knitted structure, a woven structure and a non-woven structure.

As the preferred technical solution:

In the method as described above, the three-layer structure is a knitted structure of moisture-absorbing, heat-generating fabric, which is woven with a weft-inserted structure, and the outer layer of the moisture-absorbing, heat-generating fabric is knitted with full needles and single-sided knitting. The inner layer of the moisture-absorbing and heat-generating fabric adopts the method of full needle and single-sided knitting. In the interlayer formed by the single-sided knitting of the upper and lower needles, it is inserted as a weft yarn, and the weft-inserted yarn does not participate in the weaving, and the weft-inserted yarn and the connecting yarn together constitute the middle layer of the fabric;

Alternatively, multi-thread plating is used for weaving, and the outer layer of the moisture-absorbing and slow-heating fabric is knitted with a single-sided knitting method; The thread is fed in the way of single-sided knitting to form a pattern structure in which the outer layer loops cover the middle layer loops, and the connecting yarn is tucked on both sides on the upper and lower needle beds.

In the method as described above, the three-layer structure is a woven structure of moisture-absorbing, even heat-generating fabrics, which are woven with three-layer knotting structure, and the yarns used in the outer layer are interwoven as the surface warp and surface weft to form the outer layer, and the middle layer. The yarns used are interwoven by the middle warp and the middle weft to form the middle layer, and the yarns used in the inner layer are interwoven as the inner warp and the middle weft to form the inner layer;

The arrangement order of the surface warp, the middle warp and the inner warp is a surface warp, a middle warp and an inner warp; the arrangement order of the surface weft, middle weft and inner weft is one surface weft, one root mid-latitude and one mid-latitude;

The outer layer adopts twill weave or plain weave, and the inner layer and the middle layer adopt twill weave;

The method of joining the woven structure is to join the outer layer, the middle layer and the inner layer together using a single additional warp yarn.

The method as described above, the outer layer and the middle layer are processed and formed by a spunlace non-woven method, and the inner layer is processed and formed by a spunbond non-woven method; The ultrasonic composite method is combined, and the three-layer structure is a non-woven structure, which is a hygroscopic and even heat-generating fabric.

The method described above, the multi-layer stitching technology refers to quilting and stitching three-layer structures with different structures through a computer quilting machine, selecting the quilting pattern on the computer, setting the machine, and forming three layers Moisture-absorbing and heat-generating fabrics with different structures.

In the above-mentioned method, in the three-layered fabrics with different hygroscopic and heat-absorbing fabrics, the knitted structure is weft plain stitch or rib weave, the woven structure is plain weave, twill weave or square plain weave, and the non-woven structure is The forming process is spunlace forming, spunbonding forming or ultrasonic forming.

The inventive mechanism of the present invention is as follows:

The moisture-absorbing and heat-generating fabric of the invention combines the principle of rapid diffusion and migration of moisture in the fabric layer and the differential wicking effect between layers, and is divided into three-layer fabric functional structure. By giving each layer of fabric different functions and functional layers The heat and moisture transfer between the functional layer to achieve the final uniform and slow heating effect of the fabric.

The first layer is the diffusion moisture-conducting layer as the inner layer of the skin. This layer of fabric is mainly based on the diffusion of moisture in the fabric surface. By selecting materials with excellent moisture-conducting migration and diffusion effects, the axial direction of moisture in the fabric surface is increased. Diffusion and migration increase the diffusion area of moisture in the fabric surface and reduce the wet discomfort caused by the local accumulation of moisture; the second layer is the hygroscopic moisture storage layer as the middle layer. The material of the layer, in the process of moisture from the inner layer of the fabric through the middle layer to the outer layer, the hygroscopicity of the middle layer is used to intercept and store part of the water, so that the outer layer cannot directly absorb a large amount of water. , to alleviate the reduction in comfort caused by the rapid rate of change of the outer layer temperature. At the same time, when the amount of human sweat decreases, the moisture retained by the middle moisture storage layer will be transferred outward due to the internal and external differential wicking effect, so that the moisture absorption and heating process of the outer layer fabric can continue. The third layer is the hygroscopic heating layer as the outer layer. The heating power based on the fabric is derived from the adsorption of water molecules. This layer is made of materials with higher hygroscopicity than the inner layer and the middle layer, which will be transferred to the fabric through interlayer migration and diffusion. The moisture of the outer layer is adsorbed and the corresponding heat is released in the process, and the excellent hygroscopicity of this layer makes the moisture have a faster migration and conduction effect than the inner layer and the middle layer. The area is larger, so the heat distribution of the whole fabric due to moisture absorption is more uniform.

The inner layer of the present invention has excellent water diffusion and conduction effects, and the inner layer fabric must have a certain degree of hygroscopicity, so that moisture can quickly migrate and conduct in the inner layer to avoid moisture accumulation; its rapid diffusion conduction is expressed as the liquid moisture in the layer The diffusion speed should be greater than 1mm/s. Polyester filaments with special-shaped section and polyamide filaments with special-shaped section have excellent moisture conduction due to the groove structure on their surfaces. At the same time, the excellent hygroscopicity of fiber materials is also conducive to the diffusion and conduction of moisture under certain conditions. The special-shaped cross-section filament is combined with the spun yarn with certain hygroscopicity to form a continuous surface moisture conduction channel and a large number of internal pores, so that water molecules can migrate and transport along the groove and continuous pore channels under the action of capillary, and then realize moisture In-plane diffusion conducts moisture.

The middle layer in the present invention has better hygroscopicity and water retention than the inner layer, so that when the water diffuses and conducts to the middle layer, it absorbs and intercepts part of the water before the outer layer, increases the free range of water movement and relieves the direct large amount of water in the inner layer. It reaches the outer layer for moisture absorption and heat generation; therefore, the fiber material with a predetermined moisture regain between 8% and 12.5% is selected. When the water passes through the middle layer, due to its good hygroscopicity, the hydrophilic group on the middle layer fiber material will be with the middle layer. The adsorption of water molecules makes the water molecules firmly adhere to the surface of the fiber until it reaches the saturation of moisture absorption, so as to relieve a large amount of water directly reaching the outer layer of the fabric for moisture absorption and heat generation.

In the present invention, the outer layer has better hygroscopicity than the middle layer, and the tightness of the outer layer fabric is higher than that of the inner layer and the middle layer, so as to prevent the water from directly diffusing to the outside through the pores of the outer layer fabric, and at the same time, the outer layer fabric has excellent The hygroscopicity and hygroscopicity make the water adhere to the outer layer and release heat during the rapid diffusion and conduction of the outer layer, so as to achieve the effect of hygroscopic heat generation. Its rapid diffusion and conduction means that the diffusion rate of liquid water in this layer should be greater than 1.5mm/s; its hygroscopic heat generation means that the maximum temperature rise is not less than 4°C, and the average temperature rise within 30 minutes is not less than 3°C. Therefore, the hygroscopic heating fiber material containing a large number of hydrophilic groups and low crystallinity is selected. These hydrophilic groups release the corresponding heat by forming bound water with different degrees of binding with water molecules, that is, the hydrophilic groups and water molecules. Intermolecular hydrogen bonds combine to form tightly bound water and release a lot of heat, and then these tightly bound water combine with other water molecules through intermolecular hydrogen bonds to form non-tightly bound water and release a certain amount of heat. The low crystallinity of the fiber material itself facilitates the relatively stable attachment of these bound moisture to the interior of the fiber. At the same time, the excellent hygroscopicity of this type of fiber material is also conducive to the diffusion and migration of moisture in the outer layer of the fabric. The moisture-absorbing and heating fiber area of the outer layer of the fabric is larger, so the overall heat distribution of the fabric due to moisture absorption is more uniform.

On the basis of imparting the function of diffusing and conducting moisture to the inner layer of the fabric, the function of absorbing and storing moisture in the middle layer, and the function of absorbing and heating the outer layer, the invention realizes the final effect of absorbing moisture and slowing down the heat generation of the fabric through the transfer of heat and moisture between the functional layer and the functional layer. . Through the differential wicking effect of a certain moisture absorption gradient formed in the inner layer of the fabric, the middle layer to the outer layer, the water molecules are diffused and transferred from the inner layer to the outer layer, and at the same time shuttle alternately between the inner layer and the middle layer of the fabric, the middle layer The connecting yarn with the outer layer provides a continuous moisture-conducting channel for moisture, and realizes the transfer and migration of moisture between the layers. When water molecules pass through the inner layer of the fabric, they diffuse in the surface along the grooves and pore channels inside the material under the action of capillary. , to relieve the moisture directly diffused between the surfaces to the outer layer of the fabric for local moisture absorption and heat release. The water diffused in the plane is transferred to the middle layer under the differential wicking effect and its own evaporation and diffusion, and part of the water is retained and stored until the middle layer material reaches a certain saturated humidity, which further prolongs the time for the water to reach the outer layer and effectively increases the The free range of movement of moisture inside the fabric. And because the middle layer has relatively excellent hygroscopicity, a certain amount of heat will be generated during the moisture adsorption process, and the fabric layer and the layer are combined by connecting yarns, so that the middle layer has a certain static air layer, which plays a role in the dissipation of heat. certain barrier. Through the diffusion of moisture in the inner layer of the fabric, the moisture storage in the middle layer and the differential wicking effect between the layers, the moisture diffusion area that finally reaches the outer layer is large, and there are more moisture-absorbing and heating fibers in the outer layer to participate in the interaction with water molecules. In the process of adsorption and heat release, the uniform distribution of heat in the fabric is realized. Due to the tight design structure of the outer layer fabric, while effectively preventing the water from diffusing to the outside through the pores, a certain amount of heat loss is blocked by forming static air with the middle layer. The moisture in the two layers of fabrics evaporates and dries quickly, so as to relieve the wet and cold discomfort on the human body caused by the absorption of heat from the surface of the human body caused by the moisture in the two layers of fabrics.

beneficial effect

(1) The moisture absorption and heat generation fabric of the present invention can realize multiple functions such as uniformity, slowness, moisture absorption and heat generation, and warmth retention of the fabric under the premise of satisfying the national standard index of moisture absorption and heat generation;

(2) The moisture absorption and heat generation fabric of the present invention can relieve the thermal discomfort of the human body caused by the rapid temperature rise of the fabric due to the moisture absorption and heat generation after the human body sweats during the exercise process, and relieve the dampness and cold caused by the sweat evaporation and heat absorption after the human body exercise. The discomfort is of great significance to the realization of the heat and humidity comfort function of clothing.

Description of drawings

Figure 1 is a schematic structural diagram of the moisture-absorbing and heat-generating fabric of the present invention, wherein 1-diffusion and moisture-conducting layer, 2-hygroscopic and moisture-storing layer, 3-hygroscopic and heat-generating layer;

Fig. 2 is the weaving process diagram of the moisture-absorbing and heat-generating fabric in Example 1;

Fig. 3 is the knitting needle arrangement diagram of the moisture-absorbing and heat-generating fabric in Example 1;

Fig. 4 is the triangular arrangement diagram of the moisture-absorbing and heat-generating fabric in Example 1, wherein "one"-floating line triangle, "∧"-lower needle cylinder forming triangle, "∨"-upper needle bed forming circle triangle, "凵" - tucked triangle;

Fig. 5 is the temperature rise curve diagram within 30min of the hygroscopic and heat-generating fabric of the present invention;

6 is a temperature distribution diagram when the moisture absorption and heat generation temperature value of the moisture absorption and heat generation fabric of the present invention is the largest;

Fig. 7 is a binarization diagram of the temperature distribution of the hygroscopic, uniform and heat-generating fabric of the present invention, wherein the black area is the part where the temperature of the fabric is lower than 22°C, and the white area is the part where the temperature of the fabric is higher than 22°C; 1# is the comparative example 1 , 2# is Example 1, and 3# is Example 2.

Detailed ways

The present invention will be further described below in conjunction with specific embodiments. It should be understood that these examples are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

The schematic diagram of the structure of the moisture-absorbing and heat-generating fabric of the present invention is shown in Figure 1, wherein 1-diffusion and moisture-conducting layer, 2-hygroscopic and moisture-storing layer, 3-hygroscopic and heat-generating layer.

Example 1

A hygroscopic and even heat-generating fabric is woven from four kinds of yarns. Hot filament fiber is developed by Shanghai Jieyikang Chemical Technology Co., Ltd. It is a kind of acrylic fiber made by a special process. It is composed of acrylic acid, sodium acrylate and acrylamide. The weft insertion yarn is 32S cotton carded yarn; the connecting yarn is 75D/72F polyester DTY filament; the inner yarn is 75D/72F cross-section COOLDRY polyester filament and 60S polyester-cotton blending ratio of 80/ Composite yarn made of 20 spun yarns.

The weaving method of the moisture-absorbing and heat-generating fabric comprises the following steps in turn:

(1) Select the above four kinds of yarn raw materials according to the designed fabric, and prepare the number of raw material tube heads necessary for the above four kinds of raw materials when the machine is put on the machine according to the actual situation of the model;

(2) Weaving the raw material on the machine, knitting according to the knitting process diagram shown in Figure 2, the arrangement of the knitting needles is arranged as shown in Figure 3, and the triangular arrangement of the knitting needles is arranged as shown in Figure 4. Among them, ①②③④⑤⑥⑦⑧ in Fig. 2 is the number of the yarn feeding path; 1 and 2 in the upper and lower rows in Fig. 3 are the knitting needles numbered into No. 1 needle and No. 2 needle according to the height of the knitting needles, which are located in the upper and lower rows. The row is the arrangement of the upper dial knitting needles, and the lower row is the arrangement of the lower needle cylinder knitting needles; in Figure 4, the upper row table is the delta arrangement of the upper dial knitting needles, which is located in the lower row of the table. It is the triangular arrangement of the lower cylinder knitting needles, among which, "∧" and "∨" are the circle-forming triangle, "凵" is the tuck triangle, and "-" is the floating line triangle;

When weaving on the machine, there are a total of eight knitting to complete a complete weave. The first route is single-sided knitting with full stitches on the upper needle, the second route is single-sided knitting with full stitches on the lower needle, and the third route is the 1st needle on the upper needle. Double-sided knitting with half needle tuck out and half needle tuck out of No. 1 lower needle, the lower needle on the 4th road does not participate in the knitting to form the weft insertion yarn, the 5th road repeats the knitting of the ① road, and the 6th road repeats the 2nd road knitting , Route ⑦ is double-sided knitting in which the upper needle No. 2 needle is half-tucked and the lower needle No. 2 needle is half-tucked, and route ⑧ repeats route ④ without participating in knitting. Among them, routes ① and ⑤ are composite yarns made of 75D/72F cross-section COOLDRY polyester filament and 60S polyester-cotton blended spun yarn with a ratio of 80/20, and routes ② and ⑥ are 32S cool silk /Viscose blend ratio is 20/80 hygroscopic heating yarn, the ③ and ⑦ routes are 75D/72F polyester DTY filament, and the ④ and ⑧ routes are 32S cotton carded yarn;

(3) The obtained fabric blank is cut along the opening line and fully checked into the warehouse at the same time;

(4) After the fabric blank is pre-shaped, de-oiled, washed and re-shaped, a moisture-absorbing and even heat-generating fabric is obtained.

Through the liquid moisture management of the woven moisture-absorbing and heat-generating fabric, the diffusion rate of liquid moisture in the inner layer is 1.34mm/s, and the diffusion rate of liquid moisture in the outer layer is 1.94mm/s; according to GB/T 29866-2013, the fabric moisture absorption and heat generation The performance test shows that the maximum temperature rise of moisture absorption and heat generation is 5.2℃, which exceeds the requirement of ≥4.0℃ of the national textile industry standard. The average temperature rise of moisture absorption and heat generation for 30 minutes is 3.7℃, which exceeds the national textile industry standard. As shown in Figure 5, the temperature rise rate is 0.84°C/min, and the fabric heat retention time is 21min.

The woven moisture-absorbing and heat-generating fabrics are tested as follows: the moisture-absorbing and heat-generating fabrics that have been dried and tempered and equilibrated for 1 hour in a standard atmospheric environment are subjected to moisture treatment, and the surface temperature of the moisture-absorbing and heat-generating fabrics is measured. The size of the heating fabric is 25cm×25cm, the moisture supply range is a circular range of 2cm in the center of the hygroscopic uniform heating fabric, and the moisture supply rate is 0.2ml/min. The test results are shown in Figure 6. The maximum temperature rise is 23.9 °C, and the heating area higher than the average temperature value of the cloth surface accounts for 54.75% of the total area of the cloth surface, as shown in Figure 7.

Comparative Example 1

A moisture-absorbing and exothermic fabric, the weaving method is full-needle knitting on a single jersey knitting machine, the thread length of the fabric is the same as that of the outer layer of Example 1, which is 14.8 cm, and the raw materials used are the same as those of the outer layer of Example 1; The obtained hygroscopic heating fabric was tested for the moisture absorption and heating performance of the fabric according to GB/T 29866-2013. The maximum temperature rise of hygroscopic heating was 5.1℃, and the average temperature rise of hygroscopic heating for 30min was 3.2℃. As shown in Figure 5, its temperature rise The rate was 1.09°C/min, and the fabric heat retention time was 16min. The same test method as in Example 1 was used to test the woven hygroscopic heating fabric, as shown in Figure 6, the test results were: the maximum temperature rise of hygroscopic heating was 24.5°C, and the heating area higher than the average temperature value of the cloth surface accounted for 45.43% of the total area of the cloth, as shown in Figure 7.

Comparing Example 1 with Comparative Example 1, it can be seen that the time for the fabric of Example 1 to reach the highest temperature rise is 1.5 minutes later than that of the reference sample. The heat-generating area of the moisture-absorbing and heat-generating fabric in Example 1 is 9.32% larger, which shows that the heat-distribution of the fabric in Example 1 is more uniform, which proves that the fabric has a better effect of absorbing moisture and generating heat evenly.

Example 2

A moisture-absorbing and heat-generating fabric is woven from four kinds of yarns. The outer yarns, weft-inserted yarns, and connecting yarns are the same as those in Example 1, and the inner yarns are 75D/72F cross-section COOLDRY polyester. A composite yarn made of filament and 60S pure cotton spun yarn.

The weaving method of the moisture-absorbing and heat-generating fabric comprises the following steps in turn:

(1) Select the above four kinds of yarn raw materials according to the designed fabric, and prepare the number of raw material tube heads necessary for the above four kinds of raw materials when the machine is put on the machine according to the actual situation of the model;

(2) Weaving the raw material on the machine, when weaving on the machine, the method is the same as that of Example 1, except that the first and fifth routes are 75D/72F cross-section COOLDRY polyester filament and 60S pure cotton spun yarn The composite yarn formed by doubling;

(3) The obtained fabric blank is cut along the opening line and fully checked into the warehouse at the same time;

(4) After the fabric blank is pre-shaped, de-oiled, washed and re-shaped, a moisture-absorbing and even heat-generating fabric is obtained.

Through the liquid moisture management of the woven moisture-absorbing and heat-generating fabric, it is found that the diffusion rate of liquid moisture in the inner layer is 1.91mm/s, and the diffusion rate of liquid moisture in the outer layer is 1.74mm/s; according to GB/T 29866-2013, the fabric moisture absorption and heating The performance test shows that the maximum temperature rise of moisture absorption and heat generation is 5.5 °C, and the average temperature rise of moisture absorption and heat generation for 30 minutes is 3.9 °C. The rising rate is 0.94°C/min, and the heat retention time of the fabric is 24min.

The same test method as in Example 1 was used to test the woven moisture-absorbing and heat-generating fabric. The results are shown in Figure 6. The highest temperature rise was 24.3°C (lower than Comparative Example 1), which was higher than the average temperature of the fabric. The heating area of the value accounts for 65.52% of the total area of the cloth, as shown in Figure 7. That is, the heating area of the fabric in Example 2 is 20.09% larger than that of the fabric in Comparative Example 1, which shows that the heat distribution of the fabric woven in Example 2 is more uniform, and the fabric has a better effect of absorbing moisture and heating up evenly.

Claims (12)

1. Moisture-absorbing and heat-generating fabric is characterized in that: it is a three-layer fabric consisting of an inner layer, a middle layer and an outer layer; the inner layer, the middle layer and the outer layer are independently selected from knitted structure, woven structure or nonwoven structures; The inner layer has the function of diffusion and moisture conduction, and plays the role of rapid diffusion and conduction of moisture. The middle layer has the function of absorbing moisture and storing moisture, which partially intercepts and stores the moisture transmitted from the inner layer to the middle layer, increases the free movement of moisture and relieves the moisture in the inner layer to directly reach the outer layer for moisture absorption and heat generation; it absorbs moisture. The capacity is between the inner layer and the outer layer, and the fiber moisture regain of the middle layer is 8% to 12.5%; its liquid moisture diffusion rate is between the inner layer and the outer layer; The outer layer has the function of absorbing moisture and heating, which can quickly diffuse and conduct the moisture passing through the inner layer and the middle layer, and absorb the moisture to release heat; the rapid diffusion and conduction is expressed as the diffusion speed of liquid water is greater than 1.5mm/s; For the moisture-absorbing and heating fabric, the effect of moisture-absorbing and heating is expressed as the maximum temperature rise is 4.5 to 7°C, the average temperature rise within 30 minutes is 3.2 to 4°C, and the temperature rise rate reaching the maximum temperature rise is less than 1°C/min, and the fabric reaches Compared with the weft plain knitted fabric woven by the same kind of hygroscopic and exothermic blended yarn, the time of maximum temperature rise is 1-3 minutes behind, and the heat retention time is 21-25min; The appreciation value is slightly lower than that of the weft jersey woven by the same kind of hygroscopic and exothermic blended yarn, and its heating area is more than 5% larger than that of the weft jersey woven by the same kind of hygroscopic and exothermic blended yarn. 2. The fabric according to claim 1, wherein the inner layer is made of a filament with a special-shaped section, a composite yarn containing a filament with a special-shaped section, or a non-woven fabric sheet containing the filament with a special-shaped section. to make; The middle layer is made of pure spun yarn, blended yarn or non-woven fabric; The outer layer is made of a blended yarn or a non-woven fabric sheet containing hygroscopic heat-generating fibers. 3. The fabric according to claim 2, characterized in that the composite yarn containing filaments with special-shaped cross-sections refers to the yarns of the filaments with special-shaped cross-sections and A fibers blended together; the The non-woven fabric sheet containing the filaments with special-shaped cross-section refers to the non-woven fabric sheet formed by uniformly mixing the special-shaped cross-section filaments and A fibers; the special-shaped cross-section is a cross-shaped, Y-shaped or "king" shape; The special-shaped section filament is a special-shaped section polyester filament or a special-shaped section polyamide filament; The A fiber is one or more of cotton fiber, wool fiber, polyester fiber, polyamide fiber, viscose fiber, Lenzing fiber, cupro fiber and modal fiber; According to the weight percentage, the special-shaped section filaments account for 40% to 80%. 4. The fabric according to claim 2, wherein the pure spun yarn, blended yarn or non-woven fabric in the middle layer is made of cotton fiber, wool fiber, viscose fiber, Lenzing One or more of fibers, cupro fibers, modal fibers, polyamide fibers, and polyester fibers. 5. The moisture-absorbing and heat-generating fabric according to claim 2, wherein the blended yarn or non-woven fabric sheet containing moisture-absorbing and heat-generating fibers is made by blending or mixing moisture-absorbing and heat-generating fibers with C fibers; In the blended yarns or non-woven fabrics containing hygroscopic heating fibers, the hygroscopic heating fibers account for 10% to 40%; Described C fiber is one or more of cotton fiber, wool fiber, viscose fiber, Lenzing fiber, cupro fiber and modal fiber; The moisture-absorbing and heating fibers refer to modified polyacrylonitrile fibers, modified polyacrylate fibers, modified polyacrylate fibers or modified protein viscose fibers; The modification refers to introducing hydrophilic groups into the macromolecular chains of polyacrylonitrile fibers, polyacrylate fibers, polyacrylate fibers or protein viscose fibers. 6. The fabric according to claim 2, wherein the hygroscopicity of the inner layer, the middle layer and the outer layer is in the order of: outer layer>intermediate layer>inner layer. 7. The method for weaving the moisture-absorbing and heat-generating fabric according to any one of claims 1 to 6, characterized in that: adopting knitting, weaving, non-woven technology or multi-layer stitching technology to weave the three-layer structure's moisture-absorbing and heat-absorbing fabric heating fabric; The three-layer structure includes one or more of a knitted structure, a woven structure and a non-woven structure. 8. The method according to claim 7, wherein the three-layer structure is a knitted structure of moisture-absorbing and heat-generating fabrics, which are woven with a weft-inserted structure, and the outer layer of the moisture-absorbing and heat-generating fabrics is filled with lower needles. The thread is fed in the way of single-sided knitting; the inner layer of the moisture-absorbing and heat-absorbing fabric is fed in the way of single-sided knitting; the connecting yarn and the outer layer, the connecting yarn and the inner layer They are connected by tucks, respectively, and the weft-inserted yarns are inserted as weft yarns in the interlayer formed by single-sided knitting by the upper and lower needles respectively. Alternatively, multi-thread plating is used for weaving, and the outer layer of the moisture-absorbing and slow-heating fabric is knitted with a single-sided knitting method; The thread is fed in the way of single-sided knitting to form a pattern structure in which the outer layer loops cover the middle layer loops, and the connecting yarn is tucked on both sides on the upper and lower needle beds. 9. The method according to claim 7, characterized in that, the three-layer structure is a woven-structure moisture-absorbing and heat-generating fabric, which is woven with a three-layer knot structure, and the yarn used in the outer layer is used as the surface warp and the outer layer. The surface weft is interwoven to form the outer layer, the yarn used in the middle layer is interwoven by the middle warp and the middle weft to form the middle layer, and the yarn used in the inner layer is interwoven as the inner warp and the inner weft to form the inner layer; The arrangement order of the surface warp, the middle warp and the inner warp is a surface warp, a middle warp and an inner warp; the arrangement order of the surface weft, middle weft and inner weft is one surface weft, one root mid-latitude and one mid-latitude; The outer layer adopts twill weave or plain weave, and the inner layer and the middle layer adopt twill weave; The method of joining the woven structure is to join the outer layer, the middle layer and the inner layer together using a single additional warp yarn. 10. The method according to claim 7, wherein the outer layer and the middle layer are processed and formed by a spunlace non-woven method, and the inner layer is processed and formed by a spunbond non-woven method; Spunlace, acupuncture, hot pressing or ultrasonic composite method, woven into a non-woven three-layer structure, moisture absorption and heat generation fabric. 11. The method according to claim 7, characterized in that, the multi-layer stitching technique refers to quilting and stitching three-layer structures with different structures by a computerized quilting machine, and selecting the quilted stitched on a computer. Pattern, set the machine, and form a three-layer structure of different moisture absorption and heat generation fabrics. 12. The method according to claim 11, characterized in that, in the three-layered fabrics with different hygroscopic and heat-absorbing fabrics, the knitting structure is weft plain stitch or rib weave, and the woven structure is plain weave, twill weave The weave or square weave, the forming process of the non-woven structure is spunlace forming, spunbonding forming or ultrasonic forming.

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