CN108350628A

CN108350628A - A kind of two-sided knitting fabric

Info

Publication number: CN108350628A
Application number: CN201780004144.6A
Authority: CN
Inventors: 翁佛全; 张晴
Original assignee: Toray Fibers and Textiles Research Laboratories China Co Ltd
Current assignee: Toray Fibers and Textiles Research Laboratories China Co Ltd
Priority date: 2016-03-24
Filing date: 2017-03-23
Publication date: 2018-07-31
Also published as: JP2019509407A; US20190112735A1; TW201738422A; EP3434818A1; EP3434818A4; WO2017162183A1; CN107227551A

Abstract

A kind of two-sided knitting fabric, including surface layer (1) and inner layer (2), wherein surface layer (1) is connected with inner layer (2) by lopping mode, inner layer (2) has concaveconvex structure, and at least one direction is made of 3~10 coils in the vertical, horizontal of each protrusion unit (3).The dry and comfortable of skin contact layer of the two-sided knitting fabric is had excellent performance, and wearing comfort is preferable, particularly suitable for making T-shirt, POLO shirts etc..

Description

Double-faced knitted fabric

Technical Field

The invention relates to a double-sided knitted fabric, in particular to a double-sided knitted fabric capable of keeping the skin of a human body dry and cool.

Background

With the increasing progress of science and technology, new design concepts are continuously applied to the development of garment materials. In the face of hot summer months, sweat management is an important issue in the garment field. In summer, the body is generally lowered to a comfortable temperature by excreting sweat, but when a large amount of sweat is produced, the clothes are easily soaked by the sweat and adhered to the skin, which prevents the further perspiration and cooling of the human body and produces discomfort such as sultry and oppression.

At present, a plurality of technologies for absorbing water and releasing sweat are available in the market, and the fabric has a certain effect on treating a small amount of sweat, but the fabric still can be adhered to the skin when a human body sweats a large amount, so that people feel uncomfortable. For example, patent document CN204281985U discloses a three-dimensional water-guiding single-sided double-layer knitted fabric, the surface layer of which is a moisture-absorbing quick-drying layer formed by hydrophilic modified polyester low stretch yarn fibers, the inner layer of which is a water-repellent layer formed by nylon coated yarns, the moisture-absorbing quick-drying layer protrudes toward the water-repellent layer to form a U-shaped structure, the fabric absorbs sweat through the U-shaped structure, and the water-repellent layer prevents the fabric from adhering to the skin during sweating, so that the three-dimensional water-guiding single-sided double-layer knitted fabric has a certain dry and comfortable effect. However, when a large amount of sweat is generated by a human body, the single-sided tissue is adopted, the thickness of the water repellent layer is not enough to prevent the surface layer of the fabric from being adhered to the skin of the human body, and moreover, the protruding U-shaped structure of the fabric is in contact with the skin, so that the fabric which is full of sweat is more easily adhered to the skin; in addition, the inner layer is a water repellent layer, so that the sweat absorbing capacity is insufficient, and sweat is difficult to discharge in time.

For another example, in a woven fabric disclosed in japanese patent application laid-open No. 2011-226026A, a horizontal or longitudinal groove is formed in an inner layer, and water repellent yarn is used at a convex part between the groove and the groove, sweat on the skin can flow into the groove through the convex part and flow out through the groove by virtue of the gravity of the sweat, so that a dry and comfortable effect is brought to the skin surface to a certain extent, but the sweat absorption performance is low because the water repellent yarn is used at the convex part, and the sweat cannot be led out to the surface in time when a large amount of sweat is generated; further, the continuous convex portions give a strong feeling to the skin and are insufficient in wearing comfort.

For another example, patent document CN204281985U discloses a double-faced knitted fabric having an evaporation layer and a moisture-wicking layer, in which a concave-convex structure is provided on the moisture-wicking layer, so that a certain air circulation space is formed between the skin and the fabric, thereby providing a cool feeling to the human body; meanwhile, the one-way moisture conductivity of the fabric is increased and the quick drying effect is improved through the linear density difference between the evaporation layer and the moisture conductivity layer. However, the concave-convex structure is formed by connecting in a tucking mode, and the concave part has no moisture-conducting coil, so that the perspiration performance of the fabric is greatly reduced; moreover, when a large amount of sweat is generated by a human body, the problem that the fabric adheres to the skin cannot be effectively solved if the human body simply relies on the convex parts contacting with the skin to conduct sweat guiding and removing.

Therefore, it is very important to develop a fabric that can maintain a dry and smooth feeling on the skin even when a large amount of sweat is produced.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide a double-knit fabric which can be easily processed and can maintain a dry and smooth skin surface without sticking to the skin in the case of a large amount of perspiration.

The technical solution of the invention is as follows:

the double-faced knitted fabric comprises a surface layer and an inner layer, wherein the surface layer and the inner layer are connected in a looping mode, the inner layer is of a concave-convex structure, and at least one of the longitudinal direction and the transverse direction of each convex unit is composed of 3-10 coils.

The invention is obtained by adopting a double-sided full-loop organization structure and forming a specific concave-convex structure on the inner layer. Sweat is timely discharged by utilizing the specific concave-convex structure, the problem that the fabric is stuck to the skin is effectively solved, the dry performance of the skin contact surface can be kept even if a large amount of sweat is generated, the wearing comfort level is good, and the fabric is particularly suitable for manufacturing T-shirts, POLO shirts and the like.

Drawings

Fig. 1 is a schematic structural view of the double-sided knitted fabric of the present invention, wherein 1 is a surface layer, 2 is a back layer, 3 is a convex portion of the back layer, 4 is a concave portion of the back layer, and h is a height of the convex portion of the back layer.

Fig. 2 is a schematic diagram of the concavo-convex structure unit, where 5 is the number of horizontal coils of the convex portion unit, 6 is the number of vertical coils of the convex portion unit, 7 is the number of horizontal coils of the concave portion unit, and 8 is the number of vertical coils of the concave portion unit.

Detailed Description

Considering that the single-side tissue is too thin to effectively prevent the fabric soaked by sweat from being stuck on the skin, the invention selects the double-side tissue which is knitted by the double-side circular knitting machine and has a surface layer and an inner layer. In the double-sided circular knitting fabric, the surface layer and the inner layer are connected in three modes, the first mode is a tucking mode, namely, tucking is carried out on the two sides of the dial and the needle cylinder, connected yarns are clamped between the two layers, when a human body sweats, because the surface of the inner layer is relatively flat, sweat is easy to diffuse in the inner layer, and the skin surface is difficult to obtain the effect of dryness and comfort. The second is a looping mode, that is, the dial and the needle cylinder are looped, the connected yarns have loops on both sides, and a surface with a concave-convex structure can be obtained through the difference of the tissue design or the length of the knitting thread, so that point contact is formed between the fabric and the skin, the air circulation space between the fabric and the skin is increased, and the human body has a fresh feeling; in addition, sweat can be quickly led out of the surface through the concave parts formed on the inner layer by the connecting wires, so that the effect of dry and comfortable skin is achieved; the third is the combination of tucking and looping, namely, the dial looping needle cylinder tucking or the dial tucking needle cylinder looping, the connecting yarn forms mesh on the looping surface, although the mesh structure can increase the air circulation space between the fabric and the skin to a certain extent, the pore part of the mesh has no looping loop which can be used for transmitting sweat, and only can depend on the non-mesh part which is contacted with the skin of the human body, thus the dry and comfortable effect is greatly weakened. Therefore, the invention adopts a loop-forming mode to connect the front layer and the back layer.

In the present invention, the arrangement of the concave-convex structure is not particularly limited, and may be continuous or discontinuous. However, in view of the convenience of weaving, it is preferable that the concavo-convex structure is continuously arranged.

In addition, in the concave-convex structure, the size of the convex unit also influences the dry effect of the fabric. When the number of the longitudinal and transverse coils forming the convex part unit is less than 3, the fabric directly contacting with the skin in unit area is too small, an effective air circulation channel is difficult to form in the clothes, and the dry effect is poor; when the number of the vertical and horizontal coils constituting the projection unit is more than 10, large projections are formed in the inner layer, the feeling of skin contact is poor, and sweat is likely to spread and stay in the projections, making it difficult to improve the dry and comfortable effect. Therefore, in the concave-convex structure of the present invention, at least one of the longitudinal and transverse directions of each convex unit is composed of 3 to 10 coils, and more preferably, the longitudinal and transverse directions are composed of 3 to 10 coils.

The present invention is not particularly limited to the size of the recess unit in the concave-convex structure. Considering that when the number of the longitudinal and transverse coils forming the concave unit is less than 3, the sweat conduction capability is reduced, and the phenomenon that sweat is stagnated in the inner layer of the fabric is possible to occur; when the number of the longitudinal and transverse coils constituting the recess unit is more than 10, the sweat-conducting performance is improved, but the contact probability between the recess and the fabric is increased, and the problem that the fabric adheres to the skin after sweat absorption may occur. Therefore, in the present invention, it is preferable that at least one of the longitudinal and transverse directions of each concave unit is composed of 3 to 10 coils, and it is more preferable that each concave unit is composed of 3 to 10 coils in the longitudinal and transverse directions.

Considering that the height of the convex part units in the concave-convex structure of the lining has certain influence on the dry and comfortable effect of the lining, the height of the convex part units is preferably 0.05-0.40 mm, and more preferably 0.10-0.30 mm. When the height of the convex unit is less than 0.05mm, the contact area of the fabric and the skin tends to increase, and the fabric is possibly soaked by sweat and stuck on the skin after sweating; generally, the larger the height of the projection unit is, the more the fabric can block the contact with the skin, and the better the dry and comfortable effect is, however, when the height of the projection unit is more than 0.40mm, the skin may have a feeling of itching when worn, and the wearing comfort is reduced.

In the present invention, it is very critical that the fibers forming the convex portions of the reverse side of the fabric are formed. On one hand, if non-polyester fibers such as cellulose fibers and nylon fibers are adopted, the moisture absorption of the fibers is superior, so that the back surface of the fabric can easily absorb a large amount of moisture, and partial moisture is difficult to diffuse to the surface in time, so that the water retention capacity of the back surface is increased, the wearing comfort is reduced, and stuffiness is caused; on the other hand, if the non-elastic polyester fiber is used, the yarn shrinkage degree during the post-knitting processing is too small, and the desired height of the projection may not be obtained, and the quick-drying effect may not be obvious. Therefore, polyester elastic fibers are preferably used as the convex fibers on the back side of the fabric of the present invention.

The polyester elastic fiber used in the present invention is preferably an elastic fiber having a recovery rate of stretch (CR value) of 30 to 70%. Polyester elastic fibers having a CR value within this range have good crimpability, and the height of the surface fabric back surface projections formed therefrom is appropriate, so that the surface fabric is less likely to stick to the skin even if a large amount of sweat is produced, and the surface fabric can always maintain a dry feeling when it is in contact with the skin. The CR value is more preferably 40 to 60%.

The type of the polyester-based elastic fiber used in the present invention is not particularly limited, and may be a monocomponent elastic fiber, a bicomponent side-by-side elastic fiber, or a high elastic false twist yarn, and is preferably polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polybutylene terephthalate/polyethylene terephthalate (PBT/PET), polytrimethylene terephthalate/polyethylene terephthalate (PTT/PET), or high viscosity PET/low viscosity PET. However, the bicomponent side-by-side elastic fiber is preferably used in view of its better bundling property than the monocomponent elastic fiber, which is more advantageous in improving the snag resistance of the fabric. The form of the elastic fiber is not particularly limited, and may be fully drawn yarn FDY or false twist yarn DTY.

The fineness of the polyester elastic fiber used in the present invention is preferably 50 to 200 deniers (D), more preferably 60 to 80 deniers (D), so as to ensure the grammage and soft hand feeling of the fabric.

In the present invention, the fiber materials used for the yarns of the surface layer, the yarns of the recesses of the back layer, and the connecting yarns may be the same or different, and are not particularly limited. The fiber material may be cellulose fiber such as cotton and viscose, synthetic fiber such as inelastic common polyester fiber and nylon fiber, or protein fiber such as wool and silk.

In order to endow the fabric with excellent elasticity, the invention can also select bare spandex yarns for mixed knitting. The fineness of bare spandex is preferably 20-70D. The larger the fineness of spandex, the larger the contractibility of the fabric, and the thicker and firmer the fabric. In order to ensure the light weight of the fabric, the fineness of the bare spandex is preferably 20-40D.

In the knitted fabric of the present invention, the water retention of the inner layer is preferably 10% or less, and more preferably 5% or less. The ratio of the water retentions from the front side to the back side is preferably 3.0 or more, more preferably 3.0 to 40.0. The larger the ratio (ratio) of the water retention rate of the exterior to the water retention rate of the interior is, the smaller the water retention rate of the interior is, and the better the dryness of the fabric is. Even under the condition of a large amount of sweat, the sweat can be quickly absorbed and transferred and can be timely diffused to the surface, the surface in contact with the skin can always keep dry and comfortable feeling, and the continuous wearing comfort is not influenced.

The present invention will be further described with reference to examples and comparative examples. The characteristics in the examples were measured and determined in the following manner.

(1) Convex height of concave-convex structure of inner layer of fabric

Firstly, cutting a 1.0 cm-0.5 cm sample according to the weaving lines of the fabric, and sticking the sample in a convex sample table (the longitudinal direction of the fabric is vertical to the surface of the convex sample table);

next, the cross section of the prepared sample was observed using a KEYENCE (Keyence) VHX-2000C microscope. The method specifically comprises the following steps: adjusting the multiplying power of a microscope to 150 times, carrying out depth synthesis and 3D display on an observed position, selecting a straight line a to be tangent to the surfaces of two adjacent concave parts, then selecting another straight line b to be parallel to the straight line a and to be tangent to two adjacent convex parts, and measuring the distance h between the two straight lines ab, namely the height of the convex parts;

according to the method, 10 positions of the sample cloth are measured respectively, the maximum two numerical values and the minimum two numerical values are removed, the middle 6 numerical values are obtained, the average value of the numerical values is calculated, and the obtained average value is the height of the convex parts in the concave-convex structure of the inner layer of the fabric.

(2) Water retention in inner layer and water retention ratio between surface and inner layers

① cutting 10cm by 10cm pieces of sample cloth from the fabric, taking 6 pieces of filter paper with the same size, taking 1 piece of organic glass with the same size, and weighing the organic glass (W) at 20 deg.C and 65% humidity₀) And weight of sample cloth (W)₁) (three decimal places are reserved);

② measuring 2 ml distilled water with syringe, placing on organic glass, placing the sample cloth on water rapidly, standing for 1 min, and weighing the weight (W) of the sample cloth after water absorption₂) (three decimal places are reserved);

③ weigh the plexiglass and remaining distilled water after the test (W)₃) (three decimal places are reserved);

④ weigh two pieces of filter paper before absorbing water (w1, w3) (three decimal places are reserved);

⑤ placing the sample cloth between the two filter papers, placing a 500 g weight on the sample cloth, standing for 1 min, and directly measuring the weights (w2, w4) of the surface filter paper and the inner filter paper (three decimal places are reserved);

⑥ the exterior-interior water retention ratio (one bit after the decimal point is retained) is calculated by the following formula,

water retention (%) of the surface layer (W2-W1)/(W)₂-W₁)×100

Water retention (%) of the inner layer (W4-W3)/(W)₂-W₁)×100

The ratio of the water retention in the interior and exterior is surface water retention (%)/interior water retention (%)

W_O: weight (g) of organic glass before water absorption

W₁: weight (g) of sample cloth before Water absorption

W₂: weight (g) of sample cloth after absorbing water

W₃: weight (g) of organic glass and residual distilled water after water absorption

w 1: weight (g) of surface filter paper before Water absorption

w 2: weight (g) of surface Filter paper after Water absorption

w 3: weight (g) of the filter paper inside before water absorption

w 4: weight (g) of the filter paper inside after water absorption.

(3) Rate of recovery from expansion and contraction CR value

a. Firstly, humidifying the yarn to be tested for 12 hours under the standard atmospheric pressure;

b. using a yarn length measuring instrument, taking 10 meters of yarn to be tested (10 circles of yarn 1 meter per circle), knotting the yarn head and the yarn tail, tying the yarn head and the yarn tail on skeins by using color marking lines for marking, and hanging the skeins on a test rack;

c. placing the skein in a standard atmospheric condition, and balancing for more than 12 hours before carrying out heat treatment;

d. adding a certain amount of soft water into the constant-temperature water tank to ensure that the sample can be completely immersed and cannot touch the wall of the water tank, and setting the temperature of the water tank to be 90 ℃. Folding the sample in half and then folding the sample in half, packaging the sample in a mesh bag in a relaxed state, carefully putting the mesh bag containing the sample into hot water, uniformly stirring the mixture by using a glass rod for 20 minutes, after the heat treatment, carefully taking out the mesh bag by using a clamp, putting the mesh bag into a tray, hanging the sample in a relaxed and tension-free manner after the mesh bag is cooled, and balancing the sample after the heat treatment in a standard atmosphere;

e. calculating the initial load and the constant load: initial load (g): 0.002 g/DxDx2 × turns, constant load (g): 0.1 g/DxDx2 × turns, D: yarn denier;

f. soft water was placed in a large number of test cartridges one day in advance and the temperature was adjusted at standard atmospheric pressure for 20 ℃ 12 hours;

g. hanging a sample on a yarn hanging hook, hanging an initial load and a constant load on a color mark line at the other end in sequence, paying attention to tension adjustment, putting the sample into soft water in a large testing cylinder, simultaneously timing by using a stopwatch, standing for 2 minutes, reading the length L of the sample by using a scale, and accurately measuring to 1 millimeter (mm); taking down the fixed load by a hook, keeping the state of hanging the initial load, standing for 2 minutes, and reading the length L1 of the sample by a ruler after 2 minutes to the accuracy of 1 mm; formula for calculating stretch recovery (i.e., yarn CR value):

in the formula: CR: recovery from stretch,%;

l: the length of the sample under the initial load and the constant load is mm;

l1: the constant load is removed, and the length of the sample under the initial load is mm.

(4) Elasticity

According to JIS L1096: the 2010D method was used to measure the elastic elongation. Wherein the content of the first and second substances,

the elastic elongation is judged to be excellent when being more than or equal to 60 percent and is represented by ◎;

the elastic elongation of 45 percent to 60 percent is judged to be good and is represented by ○;

the elastic elongation of < 45% was judged as normal and represented by △.

(5) Resistance to snagging

According to JIS L1058: 2011 method for testing thread-hooking resistance. Wherein the content of the first and second substances,

the snagging resistance is judged to be excellent when the snagging resistance is more than or equal to grade 4 and is represented by ◎;

the resistance to snagging of grade 3 or more and grade 4 or less is judged to be good and is represented by ○;

the resistance to snagging was judged as normal by a rating of < 3 and is indicated by △.

Example 1

On a 28-needle double-sided circular knitting machine, weaving a gray fabric by using 12 paths as a weaving cycle on an odd path of 75D-72 f-common PET DTY (manufactured by Toray synthetic fiber (Nantong) Co., Ltd.), and an even path of 60D-24f-PBT DTY (CR value of 49% and manufactured by Toray synthetic fiber (Nantong) Co., Ltd.), and performing pretreatment processing (scouring agent 1g/L and temperature of 95 ℃), dyeing (disperse dye, 130 ℃ C. 30min) and finishing processing (hydrophilic resin 10g/L and neutralizing acid 1g/L) on the gray fabric to obtain the knitted fabric. Specific properties are shown in table 1.

During knitting, all needles on the 1 st, 3 rd and 5 th paths on the dial are looped to form a surface layer, and meanwhile, 4 th to 6 th needles on the needle cylinder are looped to form a concave part of an inner layer; all needles on the 7 th, 9 th and 11 th paths on the dial are looped to form a surface layer, and meanwhile, the 1 st to 3 rd needles on the needle cylinder are looped to form a concave part of the next cycle; the 1 st to 3 rd needles on the needle cylinder are looped and the 4 th to 6 th needles on the 2 nd, 4 th and 6 th paths float to form a convex part of the inner layer; in the 8 th, 10 th and 12 th paths, the needles 1 to 3 on the needle cylinder are floating threads, and the needles 4 to 6 are looped to form the convex part of the next cycle.

Example 2

Weaving by taking 20 paths as one weaving cycle to obtain grey cloth, wherein when weaving is carried out, all needles on the needle dial in the 1 st, 3 rd, 5 th, 7 th and 9 th paths are completely looped to form a surface layer, and meanwhile, 4 th to 6 th needles on the needle cylinder are looped to form a concave part of an inner layer; the needles on the needle disc of the 11 th, 13 th, 15 th, 17 th and 19 th paths are completely looped to form a surface layer, and the needles on the needle cylinder of the 1 st to 3 rd paths are looped to form a concave part of the next cycle; the 1 st to 10 th needles on the needle cylinder of the 2 nd, 4 th, 6 th, 8 th and 10 th paths are looped, and the 11 th to 15 th needles float to form a convex part of the inner layer; the same procedure as in example 1 was repeated except that in the 12 th, 14 th, 16 th, 18 th and 20 th courses, the 1 st to 5 th needles on the cylinder were set as floats and the 6 th to 15 th needles were set as loops to form the convex portions of the next cycle, thereby obtaining a knitted fabric of the present invention. Specific properties are shown in table 1.

Example 3

Weaving by taking 12 paths as a weaving cycle to prepare grey cloth, wherein in the weaving process, all needles on the 1 st, 3 rd and 5 th paths are completely looped on a dial to form a surface layer, and meanwhile, the 6 th to 8 th needles on a needle cylinder are looped to form a concave part of an inner layer; all needles on the 7 th, 9 th and 11 th paths are looped to form a surface layer, and the 1 st to 3 rd needles on the needle cylinder are looped to form a concave part of the next cycle; the 1 st to 5 th needles on the needle cylinder in the 2 nd, 4 th and 6 th ways form loops, and the 6 th to 8 th needles float to form a convex part of the inner layer; in the 8 th, 10 th and 12 th paths, the needles 1 to 3 on the needle cylinder are floating threads, and the needles 4 to 8 are looped to form the convex part of the next cycle. The remainder of the process was the same as in example 1 to obtain a knitted fabric of the present invention. Specific properties are shown in table 1.

Example 4

60S cotton staple fiber yarns (manufactured by Jiangsu tin-free first cotton textile factory) are selected for the odd paths, 75D-48f-PBT/PET DTY (CR value is 41% and manufactured by Dongli synthetic fiber (Nantong) Co., Ltd.) is selected for the even paths, 20 paths are used as a weaving cycle to weave to prepare grey cloth, when weaving is carried out, all needles on a needle dial are completely looped to form a surface layer in the 1 st, 3 rd, 5 th, 7 th and 9 th paths, and meanwhile, the 6 th to 9 th needles on a needle cylinder are looped to form a concave part of an inner layer; the needles on the needle disc of the 11 th, 13 th, 15 th, 17 th and 19 th paths are completely looped to form a surface layer, and the needles on the needle cylinder of the 1 st to 4 th paths are looped to form a concave part of the next cycle; the 1 st to 5 th needles on the needle cylinder of the 2 nd, 4 th, 6 th, 8 th and 10 th paths are looped, and the 6 th to 9 th needles float to form the convex part of the inner layer; the same procedure as in example 1 was repeated except that in the 12 th, 14 th, 16 th, 18 th and 20 th courses, the 1 st to 4 th needles on the cylinder were set as floats and the 5 th to 9 th needles were set as loops to form the convex portions of the next cycle, thereby obtaining a knitted fabric of the present invention. Specific properties are shown in table 1.

Example 5

Weaving 40D-24 f-nylon FDY (manufactured by Toray synthetic fiber (Nantong) Co., Ltd.) for the odd paths and 50D-24f-PTT DTY (CR value of 31% and manufactured by Toray synthetic fiber (Nantong) Co., Ltd.) for the even paths in 20 paths of one weaving cycle to prepare grey cloth, wherein during weaving, all needles on the dial are completely looped to form a surface layer in the 1 st, 3 rd, 5 th, 7 th and 9 th paths, and 6 th to 8 th needles on the needle cylinder are looped to form a concave part of the inner layer; the needles on the needle disc of the 11 th, 13 th, 15 th, 17 th and 19 th paths are completely looped to form a surface layer, and the needles on the needle cylinder of the 1 st to 3 rd paths are looped to form a concave part of the next cycle; the 1 st to 5 th needles on the needle cylinder of the 2 nd, 4 th, 6 th, 8 th and 10 th paths are looped, and the 6 th to 8 th needles float to form the convex part of the inner layer; the same procedure as in example 1 was repeated except that in the 12 th, 14 th, 16 th, 18 th and 20 th courses, the 1 st to 3 rd needles on the cylinder were set as floats and the 4 th to 8 th needles were set as loops to form the convex portions of the next cycle, thereby obtaining a knitted fabric of the present invention. Specific properties are shown in table 1.

Example 6

60S polyester/viscose blended staple fiber yarns (manufactured by Jiangsu tin-free first cotton mill) are selected for the odd paths, 50D-24f-PTT/PET FDY (CR value is 40%, manufactured by Dongli synthetic fiber (Nantong) Co., Ltd.) is selected for the even paths, and the gray fabric is manufactured by knitting in 16 paths of one knitting cycle, wherein during knitting, all needles on the needle dial are fully looped to form a surface layer in the 1 st, 3 rd, 5 th and 7 th paths, and meanwhile, the 7 th to 10 th needles on the needle cylinder are looped to form a concave part of the inner layer; in the 9 th, 11 th, 13 th and 15 th paths, all needles on the dial are looped to form a surface layer, and the 1 st to 4 th needles on the needle cylinder are looped to form a concave part of the next cycle; the 1 st to 6 th needles on the needle cylinder are looped and the 7 th to 10 th needles on the 2 nd, 4 th, 6 th and 8 th paths form the convex part of the inner layer; the loops of the needles 1 to 4 in the needle cylinder in the 10 th, 12 th, 14 th and 16 th directions were set as floats, and the loops of the needles 5 to 10 were set as loops to form the convex portions of the next cycle, and the same procedure as in example 1 was repeated to obtain a knitted fabric of the present invention. Specific properties are shown in table 1.

Example 7

The fabric of the present invention was obtained in the same manner as in example 3 except that 60D-24f-PBT DTY (CR value of 35%, manufactured by Toray synthetic fiber (Nantong) Co., Ltd.) was used in the even-numbered lanes. Specific properties are shown in table 1.

Example 8

The knitting fabric of the present invention was obtained in the same manner as in example 3 except that 60D-36 f-general PET DTY (CR value of 20%, manufactured by Tortoise synthetic fibers (Nantong) Co., Ltd.) was used in even-numbered passes. Specific properties are shown in table 1.

Example 9

The knitting fabric of the present invention was obtained in the same manner as in example 3 except that 75D-72 f-ordinary PET DTY (manufactured by Toray synthetic fibers (Nantong) Co., Ltd.) and 30D spandex (manufactured by Envyda, USA) were used for the odd-numbered side and 75D-36 f-high-elastic PET DTY (CR value of 30% manufactured by Toray synthetic fibers (Nantong) Co., Ltd.) was used for the even-numbered side. Specific properties are shown in table 1.

Example 10

The same procedure as in example 4 was repeated except that 75D-72 f-ordinary PET DTY (manufactured by Toray synthetic fiber (Nantong) Co., Ltd.) was used for the odd-numbered pass and 75D-48f-PBT/PET DTY (CR 41% manufactured by Toray synthetic fiber (Nantong) Co., Ltd.) was used for the even-numbered pass to obtain a knitted fabric of the present invention. Specific properties are shown in table 1.

Example 11

The same procedure as in example 5 was repeated except that 75D-72 f-ordinary PET DTY (manufactured by Toray synthetic fiber (Nantong) Co., Ltd.) was used for the odd-numbered pass and 50D-24f-PTT DTY (CR value of 31% manufactured by Toray synthetic fiber (Nantong) Co., Ltd.) was used for the even-numbered pass to obtain a knitted fabric of the present invention. Specific properties are shown in table 1.

Example 12

The same procedure as in example 6 was repeated except that 75D-72 f-ordinary PET DTY (manufactured by Toray synthetic fiber (Nantong) Co., Ltd.) was used in the odd-numbered stage and 50D-24f-PTT/PET FDY (CR 40% manufactured by Toray synthetic fiber (Nantong) Co., Ltd.) was used in the even-numbered stage to obtain a knitted fabric of the present invention. Specific properties are shown in table 1.

Example 13

Knitting 8 paths as one knitting cycle to obtain a grey fabric, wherein in the knitting process, all needles on the 1 st and 3 th paths on the dial are completely looped to form a surface layer, and the 4 th and 5 th needles on the needle cylinder are looped to form a concave part of an inner layer; in the 5 th and 7 th paths, all needles on the dial are completely looped to form a surface layer, and the 1 st and 2 nd needles on the needle cylinder are looped to form a concave part of the next cycle; the 1 st to 3 rd needles on the needle cylinder in the 2 nd and 4 th ways form loops, and the 4 th and 5 th needles float to form a convex part of the inner layer; the loops of the needles 1 and 2 in the needle cylinder in the 6 th and 8 th paths are formed as floats and the loops of the needles 3 to 5 are formed as the convex portions of the next cycle, and the knitting fabric of the present invention is obtained in the same manner as in example 1. Specific properties are shown in table 1.

Example 14

Weaving by taking 12 paths as a weaving cycle to obtain grey cloth, wherein when weaving is carried out, all needles on the needle dial in the 1 st, 3 rd and 5 th paths are completely looped to form a surface layer, and meanwhile, the 3 rd to 5 th needles on the needle cylinder are looped to form a concave part of an inner layer; all needles on the 7 th, 9 th and 11 th paths are looped to form a surface layer, and the 1 st to 3 rd needles on the needle cylinder are looped to form a concave part of the next cycle; the 1 st and 2 nd needles on the needle cylinder in the 2 nd, 4 th and 6 th ways form loops, and the 3 rd to 5 th needles float to form a convex part of the inner layer; the same procedure as in example 1 was repeated except that in the 8 th, 10 th and 12 th courses, the 1 st to 3 rd needles on the cylinder were set as floats and the 4 th and 5 th needles were set as loops to form the convex portions of the next cycle, thereby obtaining a knitted fabric of the present invention. Specific properties are shown in table 1.

Example 15

Intermediate setting (temperature 190 ℃ C., vehicle speed 20m/min) was added between the pretreatment processing and dyeing, and the knitted fabric of the present invention was obtained in the same manner as in example 3. Specific properties are shown in table 1.

Example 16

The knitting fabric of the present invention was obtained in the same manner as in example 3 except that 30D-24f-PBT DTY (CR value of 49%, manufactured by Toray synthetic fiber (Nantong) Co., Ltd.) was used for the even-numbered circuit. Specific properties are shown in table 1.

Example 17

250D-96f-PBT DTY (CR value of 49%, manufactured by Toray synthetic fiber (Nantong) Co., Ltd.) was used in even-numbered lanes, and the same procedure as in example 3 was repeated to obtain a knitted fabric of the present invention. Specific properties are shown in table 1.

Example 18

The knitting fabric of the present invention was obtained in the same manner as in example 10 except that 75D-48f-PBT DTY (CR value 41%, manufactured by Toray synthetic fiber (Nantong) Co., Ltd.) was used in even-numbered courses. Specific properties are shown in table 1.

Comparative example 1

The 6 courses were knitted in one knitting cycle to obtain a gray fabric, wherein, in the knitting, the 1 st and 4 courses used 75D-72 f-general PET DTY (manufactured by tokyo synthetic fiber (southeast) ltd.) to form the surface layer in a full-stitch manner, the 3 rd and 6 courses used 60D-24f-PBT DTY (CR value of 49%, manufactured by tokyo synthetic fiber (southeast) ltd.) to form the inner layer in a full-stitch manner, and the 2 nd and 5 courses used 75D-72 f-general PET DTY (manufactured by tokyo synthetic fiber (southeast) ltd.) to connect the front and rear layers in a tuck manner on the dial and the cylinder, and the remainder of the example 1 was the same as the example 1 to obtain a knitted fabric, and the specific properties are shown in table 1.

Comparative example 2

During knitting, all needles on the needle dial of the No. 1, No. 3, No. 5, No. 7 and No. 9 are looped to form a surface layer; the 3 rd needle tuck on the needle cylinder of the 2 nd, 4 th and 6 th ways is used for connecting the front layer and the back layer and forming meshes of the back layer; the loops of the 6 th needle on the dial in the 8 th, 10 th and 12 th loops were tucked to connect the front and rear layers and form the meshes of the next cycle, and the same as in example 1 was repeated to obtain a knitted fabric. Specific properties are shown in table 1.

Comparative example 3

During knitting, 8 paths are used as one knitting cycle for knitting, all the needles on the needle dial of the 1 st, 3 rd, 5 th and 7 th paths are completely knitted to form a surface layer, the 3 rd and 4 th needles on the needle cylinder in the 1 st and 3 th paths are knitted to form a concave part of a lining layer, the 1 st and 2 nd needles on the needle cylinder in the 5 th and 7 th paths are knitted to form a concave part of the next cycle, the 1 st and 2 nd needles on the needle cylinder in the 2 nd and 4 th paths are knitted to form a convex part of the lining layer, and the 3 rd and 4 th needles are floating threads; in the 6 th and 8 th courses, the needles 1 and 2 were set as floats and the needles 3 and 4 were set as loops on the needle cylinder to form the convex portions of the next cycle, and the same procedure as in example 1 was repeated to obtain a knitted fabric. Specific properties are shown in table 1.

Comparative example 4

During weaving, 48 paths are used as a weaving cycle for weaving, all odd paths are completely looped on a dial to form a surface layer, and odd paths in the 1 st to 24 th paths are looped on 13 th to 21 st needles on a needle cylinder to form a concave part of an inner layer; forming a concave part of the next cycle by looping 1 st to 9 th needles on the needle cylinder in odd paths of the 25 th to 48 th paths; in the 1 st to 24 th paths, the 1 st to 12 th needles on the even number path on the needle cylinder are looped, and the 13 th to 21 th needles are floating threads to form a convex part of the inner layer; in the 25 th to 48 th needle cylinder, the even-numbered needles 1 to 9 were set as floats and the needles 10 to 21 were set as loops to form the convex portions of the next cycle, and the same procedure as in example 1 was repeated to obtain a knitted fabric. Specific properties are shown in table 1.

TABLE 1

In the above table, the first and second sheets,

(1) as can be seen from example 3 and example 1, in the knitted fabric having 5 loops in the lateral direction of the projection unit, the height of the projection is larger than that of the knitted fabric having 3 loops in the lateral direction of the projection unit, the water retention rate of the inner layer is lower than that of the outer layer, and the water retention rate of the surface and the inner layer is higher than that of the rear layer under the same conditions.

(2) As can be seen from examples 3 and 7, in the knitted fabric of PBT fiber having 49% of the CR value as the convex portion, the height of the convex portion is larger than that of the knitted fabric of PBT fiber having 35% of the CR value, the water retention rate of the inner layer is lower than that of the outer layer, and the water retention rate of the surface and the inner layer is higher than that of the latter, so that the water absorption and quick drying properties of the knitted fabric are better than those of the latter.

(3) As can be seen from examples 10 and 4, examples 11 and 5, and examples 12 and 6, the knitted fabric using the hydrophobic yarn for the concave portions and the knitted fabric using the hydrophilic yarn for the concave portions have the same height of the convex portions, but the former has a lower water retention rate in the inner layer and a higher water retention rate in the front and back, and therefore the former has a better water absorption quick-drying property than the latter, under the same conditions.

(4) As can be seen from examples 3 and 8, in the same conditions, the knitted fabric in which the convex fibers are PBT has a larger height of the convex than the knitted fabric in which the convex fibers are ordinary PET, and the water retention rate of the inner layer of the knitted fabric is lower than that of the outer layer and the water retention rate of the surface and the inner layer is higher than that of the knitted fabric in which the convex fibers are ordinary PET, so that the water absorption quick-drying property of the knitted fabric is superior to that of the latter.

(5) In example 1, example 13, and example 1 and example 14, it can be seen that, under the same conditions, the knitted fabric having 3 loops in both the lateral and longitudinal directions of the projection units has the same projection height as the knitted fabric having 3 loops in only one direction of the projection units, but the water retention in the inner layer of the knitted fabric is lower than that in the latter, and the water retention in the outer and inner layers is higher than that in the latter, so that the water absorption speed-drying property of the knitted fabric is better than that of the latter.

(6) As can be seen from examples 3 and 15, in the same condition, the water retention rate of the inner layer is lower than that of the latter knitted fabric, and the water retention rate of the outer and inner surfaces is higher than that of the latter knitted fabric, in the knitted fabric having the projection height of 0.40mm, compared with the knitted fabric having the projection height of 0.30mm, so that the water absorption quick-drying property of the former knitted fabric is better than that of the latter knitted fabric.

(7) As can be seen from examples 3 and 16, in the same conditions, the height of the convex portion of the knitted fabric of PBT fiber with the convex portion of fineness 60D is larger than that of the knitted fabric of PBT fiber with the convex portion of fineness 30D, and the water retention rate of the inner layer of the knitted fabric is lower than that of the outer layer and the water retention rate of the surface and the inside is higher than that of the latter, so the water absorption speed drying property of the knitted fabric of PBT fiber with the convex portion is better than that of the latter; and the anti-snagging property of the former is also superior to that of the latter.

(8) In example 3 and example 17, it can be seen that, in the same condition, compared with the PBT fiber knitted fabric having a fineness of 60D at the convex portion, the former knitted fabric has a larger height of the convex portion than the latter knitted fabric, and at the same time, the former knitted fabric has a lower water retention rate in the inner layer than the latter and a higher water retention rate in the surface and the inside, so the former knitted fabric has a better water absorption and quick drying property than the latter knitted fabric; and the elastic property of the former is better than that of the latter.

(9) As can be seen from examples 10 and 18, in the same conditions, compared with the fabric using PBT/PET as the convex fibers, the fabric using PBT/PET as the convex fibers has slightly smaller convex height than the fabric using PBT, higher water retention rate in the inner layer and lower water retention rate in the outer and inner layers, so that the water absorption quick-drying property of the fabric is slightly weaker than that of the fabric using PBT; but the anti-snagging performance of the former is better than that of the latter.

(10) As can be seen from comparative example 1 and example 1, the knitted fabric formed by the tuck-stitch bonding method has no uneven structure, the water retention rate of the inner layer of the knitted fabric is higher than that of the knitted fabric formed by the tuck-stitch bonding method, and the water retention rate of the outer layer of the knitted fabric is much lower than that of the inner layer of the knitted fabric, under the same conditions, so the water absorption quick-drying property of the knitted fabric is far lower than that of the knitted fabric formed by the tuck-stitch bonding method.

(11) As can be seen from comparative example 2 and example 1, in the same condition, the knitted fabric formed by the connection method of the surface layer loop formation and the back layer tuck formation did not form the uneven structure, and the water retention rate of the back layer of the knitted fabric was higher than that of the knitted fabric formed by the connection method of the full loop formation, and the water retention rate ratio of the front layer and the back layer was much lower than that of the knitted fabric formed by the connection method of the full loop formation, so the water absorption quick-drying property of the knitted fabric was far lower than that of the knitted. (12) As can be seen from comparative example 3 and example 1, in the knitted fabric having 2 loops in the lateral direction of the projection units under the same conditions, the projections of both the knitted fabric have the same height, but the water retention rate of the inner layer of the knitted fabric is higher than that of the outer layer of the knitted fabric, and the water retention rate of the outer layer of the knitted fabric is much lower than that of the outer layer of the knitted fabric, so the water absorption rate of the knitted fabric is far lower than that of the outer layer of the knitted fabric.

(13) As can be seen from comparative example 4 and example 1, in the knitted fabric having 12 loops in the lateral direction of the projection units under the same conditions, the height of the projections is larger than that of the knitted fabric having 3 loops in the lateral direction of the projection units, but the water retention rate of the inner layer is higher than that of the inner layer and the water retention rate of the outer layer is much lower than that of the outer layer, so that the water absorption rate of the former is far lower than that of the latter.

Claims

A double-faced knitted fabric is characterized in that: the double-faced knitted fabric comprises a surface layer and an inner layer, wherein the surface layer is connected with the inner layer in a looping mode, the inner layer is provided with a concave-convex structure, and in the concave-convex structure, at least one direction in the longitudinal direction and the transverse direction of each convex unit is composed of 3-10 coils.
A double knit fabric according to claim 1 wherein: in the concave-convex structure, the height of the convex unit is 0.05-0.40 mm.
A double knit fabric according to claim 1 or 2, wherein: in the concave-convex structure, the fibers forming the convex unit are polyester elastic fibers.
A double knit fabric according to claim 3 wherein: the polyester elastic fiber is a parallel composite fiber.
A double knit fabric according to claim 3 wherein: the fineness of the polyester elastic fiber is 50 to 200 deniers.
A double knit fabric according to claim 1 or 2, wherein: the double-sided knitted fabric also contains bare spandex yarns.
A double knit fabric according to claim 1 or 2, wherein: the surface-interior water retention ratio of the double-faced knitted fabric is more than 3.0.