Cool knitted fabric

Abstract

The invention relates to the technical field of knitted fabrics, in particular to a cool knitted fabric which comprises a surface layer, a middle layer and an inner layer which are sequentially connected. Wherein the surface layer is formed by weaving first cool silk; the middle layer is formed by weaving temperature control yarns and spandex; and the inner layer is formed by weaving second cool silk. According to the cool knitted fabric provided by the invention, a fabric structure of the cool surface layer, the temperature control middle layer and the cool inner layer is formed through the first cool yarns, the temperature control yarns, the spandex and the second cool yarns, and the temperature control middle layer can absorb heat, store the heat, distribute the heat and release the heat when the external temperature is changed, so that the cool knitted fabric is more cool. Buffering of heat conversion is achieved, the change of the skin temperature of a person making contact with the fabric is reduced, and therefore through the combined action of the structure of the cool feeling surface layer, the temperature control middle layer and the cool feeling inner layer, on the basis that the cool feeling is achieved, the keeping time of the cool feeling is further prolonged, and the durability of the cool feeling effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of knitted fabrics, in particular to a cool knitted fabric. Background Art

[0002] As people's living standards improve, they have higher and higher requirements for wearing comfort. Correspondingly, in order to pursue wearing comfort, people have higher and higher requirements for the functionality of fabrics.

[0003] In recent years, in order to pursue a cool and comfortable feeling in the hot summer, there has been an increasing interest in fabrics with cooling functions. Existing knitted fabrics with cooling functions are mostly obtained by post-treating the fabrics with corresponding cooling finishing agents. Such fabrics with cooling functions have poor washing resistance. After a certain number of washings, the cooling effect of the fabrics is seriously reduced, resulting in poor durability of the cooling effect of the fabrics, which limits the application of cooling fabrics. Summary of the invention

[0004] The invention aims to solve the problem that the cooling effect of the cooling fabric in the prior art is poor in durability.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A cool knitted fabric comprises a surface layer, a middle layer and an inner layer connected in sequence; wherein:

[0007] The surface layer is woven from the first cool yarn;

[0008] The middle layer is woven from temperature-control yarn and spandex;

[0009] The inner layer is woven from the second cool yarn.

[0010] Furthermore, the first cooling yarn comprises a core yarn and an outer sheath yarn covering the outer side of the core yarn;

[0011] The core yarn is polyester;

[0012] The outer sheath comprises a core layer and a skin layer covering the outer side of the core layer;

[0013] The skin layer is polyethylene;

[0014] The core layer is nylon.

[0015] Furthermore, the core wire has a cross-section.

[0016] Furthermore, the fineness of the core wire is 75D-150D.

[0017] Furthermore, the surface of the skin layer has a pore structure.

[0018] Furthermore, the outer covering yarn is prepared by performing sheath-core composite spinning of polyethylene slices and nylon slices.

[0019] Furthermore, the mass ratio of the polyethylene slice to the nylon slice is 40:60.

[0020] Furthermore, the temperature-control yarn is prepared by using polyester as a raw material and attaching PCM microgel to the surface of the polyester by chemical bond cross-linking.

[0021] Furthermore, the steps of making the temperature-controlled yarn include:

[0022] I. performing low-temperature plasma treatment on the polyester to obtain a pretreated substrate;

[0023] II. mixing PCM microcapsules and a cross-linking agent to prepare a mixed solution containing PCM microcapsules;

[0024] III. placing the mixed solution in an ultrasonic oscillator, passing the pretreated substrate through the ultrasonic oscillator at a speed of 20 m / min to obtain the temperature-controlled yarn.

[0025] Furthermore, the second cooling yarn is prepared from mint microcapsules and nylon by a microfluidic spinning method.

[0026] The beneficial effects of the present invention are:

[0027] The cool knitted fabric provided by the present application is composed of a first cool yarn, a temperature-controlling yarn, spandex and a second cool yarn to form a fabric structure of a cool surface layer - a temperature-controlling middle layer - a cool inner layer. The temperature-controlling middle layer can buffer heat conversion by absorbing, storing, redistributing and releasing heat when the external temperature changes, thereby reducing changes in the skin temperature of a person who contacts the fabric. Through the combined effect of the structure of the cool surface layer - the temperature-controlling middle layer - the cool inner layer, the cool feeling can be further prolonged on the basis of achieving the cool feeling, thereby improving the durability of the cool effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0029] Figure 1 It is the knitting pattern of the cool feeling knitted fabric in the present invention. DETAILED DESCRIPTION

[0030] The present invention is now further described in detail. The embodiments described below are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0031] In order to solve the problem that the cooling effect of cooling fabrics in the prior art is poorly durable, the present application provides a cooling knitted fabric, which has a three-layer knitted structure, including a surface layer, a middle layer and an inner layer connected in sequence; wherein the surface layer is woven from a first cooling yarn; the middle layer is woven from a temperature-control yarn and spandex; and the inner layer is woven from a second cooling yarn.

[0032] The cool knitted fabric provided by the present application is composed of a first cool yarn, a temperature-controlling yarn, spandex and a second cool yarn to form a fabric structure of a cool surface layer - a temperature-controlling middle layer - a cool inner layer. The temperature-controlling middle layer can buffer heat conversion by absorbing, storing, redistributing and releasing heat when the external temperature changes, thereby reducing changes in the skin temperature of a person who contacts the fabric. Through the combined effect of the structure of the cool surface layer - the temperature-controlling middle layer - the cool inner layer, the cool feeling can be further prolonged on the basis of achieving the cool feeling, thereby improving the durability of the cool effect.

[0033] Furthermore, the cool knitted fabric provided by the present application achieves the cool feeling of the fabric by selecting different yarns. Therefore, the cool knitted fabric has good washing resistance, which helps to further ensure the durability of its cool effect.

[0034] Specifically, the present application preferably comprises a first cooling yarn including a core yarn and an outer covering yarn coated on the outside of the core yarn; wherein the core yarn is moisture-absorbing and quick-drying polyester; to further improve the cooling performance, the present application preferably comprises a core yarn with a cross section, and the fineness of the core yarn is preferably 75D-150D. The outer covering yarn comprises a core layer, and a skin layer coated on the outside of the core layer; the skin layer is high molecular weight polyethylene; the core layer is nylon; and further preferably, the outer covering yarn is coated on the outer surface of the core yarn clockwise.

[0035] Among them, polyester has excellent moisture absorption and quick-drying properties. The introduction of polyester into the surface layer helps to quickly evaporate liquids such as sweat discharged from the human body and keep the fabric dry. In order to take into account the wear resistance and cooling effect of the fabric, the present application prefers that the outer sheath has a skin-core structure, with nylon as the core layer and high molecular polyethylene as the skin layer, and further prefers that the surface of the skin layer has a porous structure. Polyethylene has a large thermal conductivity and good contact cooling properties. At the same time, it also has excellent UV resistance. In order to further introduce polyethylene filaments into the raw materials of the surface layer, the cooling effect can be improved while giving the fabric sun protection properties.

[0036] The preferred outer covering yarn of the present application is prepared by sheath-core composite spinning of polyethylene slices and nylon slices. Specifically, the mass ratio of the polyethylene slices to the nylon slices is preferably 40:60.

[0037] The preferred outer covering yarn of the present application is to carry out skin-core composite spinning of high molecular weight polyethylene slices and nylon slices in a mass ratio of 40:60, and the high molecular weight polyethylene slices and nylon slices after pre-drying and crystallization (the moisture content of the slices after pre-drying and crystallization is not higher than 100PPM) are melted through different twin-screw extruders (due to the large difference in melting points between ultra-high molecular weight polyethylene and nylon, the same screw cannot be used), respectively enter different spinning boxes, and then use a metering pump to distribute the spinning solution according to a preset ratio, and the distributed spinning solution enters the composite spinning component, and is compounded. After the spinning assembly, the spinning solution is gradually cooled and stretched to form a core-skin structure fiber of specified fineness. The filaments are cooled, oiled, stretched, and wound to form the final core-skin composite fiber. The spinning box temperature corresponding to nylon is 245°C, the box temperature corresponding to high molecular polyethylene is 125°C, the GR1 (first stretching roller) hot roller temperature is 80°C, the GR2 (second stretching roller) hot roller temperature is 100°C, the GR1 hot roller speed is 1400m / min, the GR2 hot roller speed is 3350m / min, and the winding machine speed is 3300m / min.

[0038] The twin-screw extruder includes a melting zone and a devolatilization zone. The two zones of the twin screw include two functional sections in turn, and are designed in turn as a melting zone for melting the slices through a shear combination inside the screw, and a vacuum devolatilization zone for devolatilizing and removing impurities from the molten material. The screw temperature of the twin-screw melting zone corresponding to the nylon slices is set between 220-250°C; the screw temperature of the twin-screw vacuum devolatilization zone corresponding to the nylon slices is set between 220-250°C, the vacuum pressure involved is set to below 0.98MPa, and the screw speed is 45-50r / min; the screw temperature of the twin-screw melting zone corresponding to the polymer polyethylene slices is set between 120-135°C; the screw temperature of the twin-screw vacuum devolatilization zone corresponding to the polymer polyethylene slices is set between 120-135°C, the vacuum pressure involved is set to below 0.38MPa, and the screw speed is 25-30r / min;

[0039] The temperature-controlled yarn in the present application is prepared by using polyester as raw material and attaching PCM microgel to the polyester surface by chemical bond cross-linking.

[0040] Specifically, the preferred temperature-controlled yarn of the present application is prepared according to the following method:

[0041] I. Treat the substrate with low-temperature plasma: the discharge power of low-temperature plasma treatment is 50-200W; the treatment time is 3-15min; the polyester substrate treated with low-temperature plasma has more free charges, which promotes the cross-linking effect between the cross-linking agent and the substrate.

[0042] II. Preparing a mixed solution: Mixing PCM microcapsules and a cross-linking agent to prepare a mixed solution containing PCM microcapsules, wherein the content of PCM microcapsules in the mixed solution is 3000 PPM; and the cross-linking agent is isoprene.

[0043] III. Ultrasonic oscillation: The prepared mixed solution is placed in an ultrasonic oscillator, and then the substrate is passed through the ultrasonic oscillator at a speed of 20 m / min to promote the cross-linking rate of the PCM microcapsules through ultrasonic oscillation.

[0044] The middle layer in the present application is obtained by knitting the temperature-controlled yarn and spandex together through the same yarn mouth of the circular knitting machine in a double-yarn feeding manner.

[0045] The second cooling yarn in the present application is prepared from mint microcapsules and nylon by a microfluidic spinning method. Specifically, the second cooling yarn is preferably prepared according to the following method:

[0046] The microfluidic chip is made using the microelectromechanical system process. There are 2-5 spinning solution microchannels and 1 mint microcapsule microchannel inside the chip. Add 0.5-1.5% by mass of boron nitride nanosheets to the nylon spinning solution, and add an appropriate amount of organic solvent and dispersant to the mint microcapsule. Inject the prepared microcapsule solvent and spinning solution into the corresponding channels respectively, and control the flow rate of the spinning solution microchannel to 12-18mm 3 / s, the flow rate of the microcapsule channel is 3-10mmm 3 / s, the two are evenly mixed in the specific intersection area of ​​the chip to form a composite spinning solution flow, and a 1.5V voltage is applied at the outlet of the spinning solution flow to stretch and solidify the composite spinning solution flow into a fiber form. During the fiber forming process, the microcapsules are evenly embedded in the polymer fiber.

[0047] The cool knitted fabric in this application is a three-layer knitted structure, including several minimum circulation units, see Figure 1 As shown, the minimum circulation unit includes an eight-way loop forming system; wherein, the third and seventh loop forming systems are woven to form the surface layer, the second, fourth, sixth and eighth loop forming systems are woven to form the inner layer, and the first and fifth loop forming systems are woven to form the middle layer. The coil density of the surface layer and the inner layer of the fabric is 18-22 / cm, and the line length is 20-23cm.

[0048] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below.

[0049] Example 1

[0050] The present embodiment provides a cool knitted fabric, which comprises a surface layer, a middle layer and an inner layer connected in sequence; wherein the surface layer is woven from a first cool yarn; the first cool yarn is a core-spun yarn structure, comprising an outer sheath yarn and a core yarn; the core yarn is a moisture-absorbing quick-drying polyester with a cross-section of 50D fineness; the outer sheath yarn is a skin-core structure, the skin layer of the outer sheath yarn is a high molecular polyethylene, the surface has a microporous structure, the core layer of the outer sheath yarn is nylon, the outer sheath yarn is clockwise coated on the outer surface of the core yarn, the fineness of the outer sheath yarn is 75D, The mass ratio of the cortex and core layer of the outer covering yarn is 45:55; the middle layer is woven from temperature-controlled yarn and spandex; the mass ratio of the temperature-controlled yarn and spandex is 90:10; the temperature-controlled yarn is made of polyester filament as raw material, and the PCM microgel is attached to the surface of the polyester filament by chemical bond cross-linking. The temperature-controlled yarn and spandex are passed through the same yarn mouth of the circular machine in a double-yarn feed manner to weave together to obtain the middle layer; the inner layer is woven from the second cool filament; the second cool filament is prepared from mint microcapsules and nylon by microfluidic spinning.

[0051] The test method is as follows:

[0052] The continuous cooling performance of the fabric was tested according to the SGS In-House Method. The sample was placed for 1 hour and the temperature at the dripping point was recorded every 5 minutes. The test temperature was 34.8±0.3℃ and the relative humidity was 27±3%. The test results of the original sample are shown in Table 1:

[0053] Table 1

[0054] Time (min) 0 5 10 15 20 25 30 35 40 45 50 55 60 Temperature(℃) 34.8 25.5 24.3 24.2 24.4 24.4 24.5 24.7 24.9 25.0 25.1 25.4 25.8

[0055] The maximum temperature drop within 60 minutes was 10.6 degrees Celsius. After the fabric was balanced for 5 minutes, the overall temperature of the fabric tended to be stable. From the test results, the temperature control ability of the fabric was strong, maintaining the temperature change of the fabric within 2 degrees Celsius.

[0056] After washing 5 times according to GB / T8629-2017, the continuous cooling performance of the fabric was tested according to the SGS In-House Method. The sample was left for 1 hour and the temperature at the dripping point was recorded every 5 minutes. The test temperature was 34.8±0.3℃ and the relative humidity was 27±3%. The test results of the washed samples are shown in Table 2:

[0057] Table 2

[0058] Time (min) 0 5 10 15 20 25 30 35 40 45 50 55 60 Temperature(℃) 34.9 24.5 23.4 23.4 23.4 23.7 24.2 24.4 24.7 24.9 25.2 25.4 25.9

[0059] The maximum temperature drop of the washed sample within 60 minutes was 11.5 degrees Celsius. After the fabric was balanced for 5 minutes, the overall temperature of the fabric tended to be stable. From the test results, the temperature control ability of the fabric is strong, maintaining the temperature change of the fabric within 3 degrees Celsius.

[0060] The instantaneous cooling performance of fabrics was tested according to GB / T 35263-2017 "Testing and evaluation of instantaneous cooling performance of textiles", and the contact cooling value was 0.33J / (cm 2 .s).

[0061] It can be seen from the above data that the cool knitted fabric provided by the present application has good contact cooling and continuous cooling performance. The contact cooling value reaches 0.33J / (cm 2 .s), far higher than the national standard cool value requirement (0.15J / (cm 2 .s)), the continuous change in the coolness value proves that the fabric has good cooling and continuous temperature control capabilities.

[0062] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A cool knitted fabric, characterized in that: It includes the surface layer, the middle layer and the inner layer connected in sequence; among them, The surface layer is woven from the first cool yarn; The middle layer is woven from temperature-control yarn and spandex; The inner layer is woven from the second cool yarn.

2. The cool knitted fabric according to claim 1, characterized in that: The first cooling yarn comprises a core yarn and an outer covering yarn covering the outer side of the core yarn; The core yarn is polyester; The outer sheathed wire is a skin-core structure, including a core layer and a skin layer covering the outer side of the core layer; The skin layer is polyethylene; The core layer is nylon.

3. The cool knitted fabric according to claim 2, characterized in that: The core wire has a cross cross section.

4. The cool knitted fabric according to claim 2, characterized in that: The fineness of the core wire is 75D-150D.

5. The cool knitted fabric according to claim 2, characterized in that: The surface of the skin layer has a microporous structure.

6. The cool knitted fabric according to claim 2, characterized in that: The outer covering yarn is prepared by performing sheath-core composite spinning of polyethylene slices and nylon slices.

7. The cool knitted fabric according to claim 6, characterized in that: The mass ratio of the polyethylene slice to the nylon slice is 40:

60.

8. The cool knitted fabric according to claim 1, characterized in that: The temperature-control yarn is prepared by using polyester as a raw material and attaching PCM microgel to the surface of the polyester by chemical bond cross-linking.

9. The cool knitted fabric according to claim 8, characterized in that: The production steps of the temperature-controlled yarn include: I. performing low-temperature plasma treatment on the polyester to obtain a pretreated substrate; II. mixing PCM microcapsules and a cross-linking agent to prepare a mixed solution containing PCM microcapsules; III. placing the mixed solution in an ultrasonic oscillator, passing the pretreated substrate through the ultrasonic oscillator at a speed of 20 m / min to obtain the temperature-controlled yarn.

10. The cool knitted fabric according to claim 1, characterized in that: The second cool yarn is prepared from mint microcapsules and nylon by a microfluidic spinning method.

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