Sweat mark-free 3D flat needle knitted fabric and preparation method thereof

Abstract

The present application relates to the technical field of fabric, and specifically discloses a sweat traceless 3D flat knitting fabric and a preparation method thereof. The fabric is a 3D flat knitting fabric with a cladding structure yarn as an outer layer yarn, a hydrophilic cotton yarn as an intermediate yarn and a waterproof yarn as an inner layer yarn. The cladding structure yarn comprises a core yarn and a cladding yarn, the cladding yarn is spirally wound outside the core yarn and forms an incomplete covering, the core yarn is a waterproof cotton yarn, the cladding yarn is a hydrophilic cotton yarn, the number of the hydrophilic cotton yarn is higher than that of the waterproof cotton yarn, and the intermediate yarn is thinner than the outer layer yarn. In this scheme, the hydrophilic / waterproof cladding cotton yarn is used to replace ordinary hydrophobic polyester or general waterproof cotton yarn as the surface layer, so as to accelerate the evaporation rate of water in the surface layer. The intermediate layer uses hydrophilic cotton to quickly absorb water in the inner layer. The inner layer uses a special-shaped cross-section polyester to increase the water guiding capacity, so that the fiber does not swell due to water absorption, the heat and poor air permeability are avoided, and the wearing comfort of wet clothes is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fabric, and specifically discloses a sweat-stain-free 3D flat knitting fabric and a preparation method thereof. BACKGROUND

[0002] In summer, clothes are easily soaked with sweat, which brings discomfort and affects the dress sense. Therefore, some sweat-stain-free fabrics are introduced on the market to achieve the effect of not showing sweat stains after absorbing sweat.

[0003] At present, sweat-stain-free is mostly applied to shirt woven fabrics. Hydrophilic agents are immersed and applied, and waterproof agents are applied to the other side by means of printing process, so as to realize single-side hydrophilic and single-side hydrophobic, and realize inner-layer hydrophilic and moisture absorption, outer-layer hydrophobic and sweat seepage prevention and stain adhesion. The printing method easily leads to hard fabric hand feeling and poor air permeability.

[0004] When sweat-stain-free is applied to knitted fabrics, it is mainly a double-sided fabric made of water-repellent outer layer and hydrophilic inner layer connected by spandex. However, daily wear fabrics are mainly loose and comfortable. After the inner layer of the sweat-stain-free fabric absorbs water, the fibers are easily swollen. Even if part of the water is removed through capillary effect, the stuffy and air-permeable feeling is still retained, and the water can only slowly evaporate through the small pores between the yarns, which aggravates the discomfort. If the outer layer wants to quickly remove the water, high denier polyester will be selected, which is easy to cause hooking problems in production and life, affecting the appearance.

[0005] Therefore, the present application provides a sweat-stain-free fabric applied to knitted fabrics, which achieves the effect of sweat-stain-free and solves the problems of stuffy and air-permeable, and easy to hook. SUMMARY

[0006] The present application provides a sweat-stain-free 3D flat knitting fabric and a preparation method thereof to solve the problem of sweat stains caused by absorbing sweat of existing fabrics, and the problems of stuffy and air-permeable, and easy to hook of existing knitted fabrics.

[0007] The sweat traceless fabric of the present application is a hydrophobic / hydrophilic / hydrophobic 3D plain fabric; the inner layer of profiled polyester contacts moisture and immediately absorbs it into the fabric, quickly diffuses through the wicking effect, the profiled cross-section polyester is not easy to hook and ball, the fabric effect is beautiful, the high density can prevent water vapor from penetrating back to the inner layer, avoiding the accumulation of water in the inner layer of the fabric and the skin contact causing discomfort; the middle layer is hydrophilic cotton yarn, high hydrophilicity can easily absorb water in the inner layer and carry away the moisture in the inner layer; the surface layer is selected from the hydrophilic and hydrophobic treated coated structure cotton yarn, the tight spun cotton yarn has less hair, and is not easy to fall off, the thin hydrophilic cotton yarn forms a coated structure cotton yarn with the inner thick hydrophobic cotton yarn, the high count cotton yarn is relatively loose, and the normal social distance cannot observe the wetness, and the hydrophobic property of the surface layer is not affected after weaving, and the hydrophilic ability can quickly evaporate the water transmitted by the inner and middle yarns.

[0008] The specific technical scheme adopted is as follows:

[0009] In one aspect, the present application discloses a preparation method of sweat traceless 3D plain knitted fabric, comprising the following steps:

[0010] S1, yarn standby

[0011] Preparation of outer layer yarn: take cotton grey yarn, after boiling and bleaching, add active dye for dyeing treatment, then add hydrophilic agent for hydrophilic treatment or waterproof agent for waterproof treatment, dry yarn winding to get hydrophilic cotton yarn and waterproof cotton yarn respectively; the hydrophilic cotton yarn is coated outside the waterproof cotton yarn to obtain a coated structure yarn, which is used as an outer layer yarn standby; the hydrophilic cotton yarn count is higher than that of the waterproof cotton yarn;

[0012] Preparation of middle layer yarn: take cotton grey yarn, after boiling and bleaching, add active dye for dyeing treatment, then add hydrophilic agent for hydrophilic treatment, dry yarn winding to get hydrophilic cotton yarn as middle layer yarn standby, the middle layer yarn fineness is thinner than that of the outer layer yarn;

[0013] Preparation of inner layer yarn: take waterproof synthetic fiber grey yarn, after degreasing, add disperse dye for dyeing treatment, dry yarn winding to get waterproof yarn as inner layer yarn standby;

[0014] S2, fabric weaving

[0015] Adjust the position of the yarn guide, control the output sequence of the outer layer yarn, the middle layer yarn and the inner layer yarn for weaving, wash the water in the cylinder, shape, and obtain the sweat traceless 3D plain knitted fabric with coated structure yarn outside, hydrophilic cotton yarn in the middle and waterproof yarn inside.

[0016] Preferably, the fabric has a grammage of 300±5g / m 2 .

[0017] Preferably, the inner layer yarn uses cross-section polyester filament as grey yarn.

[0018] Preferably, the number of twists of the outer layer yarn of the hydrophilic cotton yarn wrapped by the waterproof cotton yarn is 200-500 twists per meter, the number of the outer layer yarn of the hydrophilic cotton yarn is 80S, and the number of the outer layer yarn of the waterproof cotton yarn is 20S-50S.

[0019] Preferably, the number of the intermediate yarn is 40S-80S.

[0020] Preferably, the hydrophilic cotton yarn of the outer layer yarn is spun as a base yarn by fine cotton compact spinning, the waterproof cotton yarn of the outer layer yarn is spun as a base yarn by fine cotton siro compact spinning, and the intermediate yarn is spun as a base yarn by fine cotton compact spinning.

[0021] Preferably, the hydrophilic auxiliary component in S1 includes 0.1-3% of a hydrophilic agent and 0.1-1.5% of a penetrating agent.

[0022] Preferably, the waterproof auxiliary component in S1 includes 1-20% of a waterproof agent, 0.1-3% of a crosslinking agent, and 0.01-0.1% of acetic acid.

[0023] Preferably, the hydrophilic treatment and the waterproof treatment in S1 are performed by adding corresponding auxiliaries to a yarn dyeing machine and treating for 10-60 minutes at 40-60°C.

[0024] In another aspect, the present application discloses a sweat traceless 3D flat needle knitted fabric,

[0025] The fabric is a 3D flat needle knitted fabric with a wrapped structure yarn as an outer layer yarn, a hydrophilic cotton yarn as an intermediate yarn, and a waterproof yarn as an inner layer yarn; the wrapped structure yarn includes a core yarn and a wrapped yarn, the wrapped yarn is spirally wrapped outside the core yarn and forms an incomplete coverage, the core yarn is a waterproof cotton yarn, the wrapped yarn is a hydrophilic cotton yarn, the number of the hydrophilic cotton yarn is higher than that of the waterproof cotton yarn, and the intermediate yarn is thinner than the outer layer yarn.

[0026] Compared with the prior art, the present application has at least the following beneficial effects:

[0027] 1. The present application effectively avoids the poor air permeability and the hot and stuffy shortcomings caused by printing a single hydrophilic single waterproof layer;

[0028] 2. The high-density 3D flat needle sweat traceless knitted fabric is soft, and is applicable to sports clothes and daily wear, effectively relieving the embarrassment caused by sweat traces on clothes in daily life;

[0029] 3. The waterproof yarn in the inner layer can effectively prevent water vapor from back permeating, the hydrophilic / waterproof wrapped structure cotton yarn in the outer layer not only improves the evaporation rate of water from the fabric, but also has better touch, higher comfort, and better appearance, and is not easy to be hooked and pilled. BRIEF DESCRIPTION OF DRAWINGS

[0030] Fig. 1 This is a diagram of the inner layer of the sweat-free 3D plain knitted fabric of Example 1 in the sweat-free test;

[0031] Fig. 2 This is a diagram of the outer layer of the sweat-free 3D plain knitted fabric of Example 1 in the sweat-free test. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Example 1

[0034] A sweat-free 3D plain knitted fabric, comprising the following steps:

[0035] S1, yarn spare

[0036] Preparation of outer yarn: 80S fine cotton compact spinning yarn is taken, and after scouring and bleaching, reactive dye is added for dyeing, and then 2% hydrophilic agent and 0.5% penetrant are added and treated at 40°C for 30 minutes, and the yarn is dried and wound at 100°C to obtain hydrophilic cotton yarn for standby use; 20S fine cotton siro compact spinning yarn is taken, and after scouring and bleaching, reactive dye is added for dyeing, and then 10% waterproofing agent, 2% cross-linking agent and 0.1% acetic acid are added and treated at 40°C for 30 minutes, and the yarn is dried and wound at 130°C to obtain waterproof cotton yarn for standby use; the hydrophilic cotton yarn is coated on the waterproof cotton yarn at 500 twists / m to obtain a coated structure yarn as the outer yarn for standby use;

[0037] Preparation of intermediate yarn: 40S fine cotton compact yarn was taken, scoured and bleached, and then dyed with reactive dyes. 2% hydrophilic agent and 0.5% penetrant were added and treated at 40°C for 30 minutes. The dry yarn was wound on a bobbin at 100°C to obtain hydrophilic cotton yarn for use.

[0038] Preparation of inner layer yarn: 50D / 48F cross-section polyester yarn is taken, degreased, and then dyed with disperse dyes. The dry yarn is wound into a bobbin to obtain waterproof yarn as the inner layer yarn for later use;

[0039] S2. Fabric weaving

[0040] Adjust the position of the yarn guide to control the output sequence of the outer yarn, middle yarn and inner yarn. The 3D plain knitted fabric is woven by a large circular machine, washed in a vat and shaped to produce a sweat-proof 3D plain knitted fabric with a covered structure yarn on the outside, a hydrophilic cotton yarn in the middle and a waterproof yarn inside. The fabric weight is 300±5g / m 2 .

[0041] Weave structure: ︿ ︿ ︿ ︿ ︿ ︿

[0042] Example 2

[0043] A sweat-free 3D plain knitted fabric, comprising the following steps:

[0044] S1, yarn spare

[0045] Preparation of outer yarn: 80S fine cotton compact spinning yarn is taken, and after scouring and bleaching, reactive dye is added for dyeing, and then 2% hydrophilic agent and 0.5% penetrant are added and treated at 40°C for 30 minutes, and the yarn is dried and wound at 100°C to obtain hydrophilic cotton yarn for standby use; 20S fine cotton siro compact spinning yarn is taken, and after scouring and bleaching, reactive dye is added for dyeing, and then 10% waterproofing agent, 2% cross-linking agent and 0.1% acetic acid are added and treated at 40°C for 30 minutes, and the yarn is dried and wound at 130°C to obtain waterproof cotton yarn for standby use; the hydrophilic cotton yarn is coated on the waterproof cotton yarn at 500 twists / m to obtain a coated structure yarn as the outer yarn for standby use;

[0046] Preparation of intermediate yarn: 40S fine cotton compact yarn was taken, scoured and bleached, and then dyed with reactive dyes. 2% hydrophilic agent and 0.5% penetrant were added and treated at 40°C for 30 minutes. The dry yarn was wound on a bobbin at 100°C to obtain hydrophilic cotton yarn for use.

[0047] Preparation of inner layer yarn: 50D / 48F cross-section polyester yarn is taken, degreased, and then dyed with disperse dyes. The dry yarn is wound into a bobbin to obtain waterproof yarn as the inner layer yarn for later use;

[0048] S2. Fabric weaving

[0049] Adjust the position of the yarn guide to control the output sequence of the outer yarn, the middle yarn, and the inner yarn. The weaving structure is consistent with that of Example 1. The 3D plain knitted fabric is woven by a large circular machine, washed in a tank, and shaped to obtain a sweat-proof 3D plain knitted fabric with a covered structure yarn on the outside, a hydrophilic cotton yarn in the middle, and a waterproof yarn inside. The fabric weight is 220±5g / m 2 .

[0050] The density and gram weight of Example 2 are slightly lower than those of Example 1. Since the overall tightness of the fabric surface is not as good as that of Example 1, more moisture-absorbing coils are easily revealed on the surface due to movement during actual wearing, resulting in sporadic water stains on the outer surface. In addition, the drying rate is also slightly lower than that of Example 1, indicating that the density and gram weight of the 3D sweat-free plain knitted fabric of this scheme play a key role in the sweat-free effect and drying rate performance.

[0051] Example 3

[0052] A sweat-free 3D plain knitted fabric, comprising the following steps:

[0053] S1, yarn spare

[0054] Preparation of outer layer yarn: take 200S fine cotton compact spinning blank, after boiling and bleaching, add active dye for dyeing treatment, then add 2% hydrophilic agent, penetrant 0.5% at 40℃ for 30min, dry yarn winding at 100℃ to obtain hydrophilic cotton yarn for standby; take 20S fine cotton siro compact spinning blank, after boiling and bleaching, add active dye for dyeing treatment, then add 10% waterproof agent, crosslinking agent 2%, acetic acid 0.1% at 40℃ for 30min, dry yarn winding at 130℃ to obtain waterproof cotton yarn for standby; the hydrophilic cotton yarn is wrapped on the waterproof cotton yarn outside to obtain a wrapped structure yarn as the outer layer yarn for standby;

[0055] Preparation of middle layer yarn: take 40S fine cotton compact spinning blank, after boiling and bleaching, add active dye for dyeing treatment, then add 2% hydrophilic agent, penetrant 0.5% at 40℃ for 30min, dry yarn winding at 100℃ to obtain hydrophilic cotton yarn for standby;

[0056] Preparation of inner layer yarn: take 50D / 48F cross-section polyester filament, after oil removal, add disperse dye for dyeing treatment, dry yarn winding to obtain waterproof yarn as the inner layer yarn for standby;

[0057] S2, fabric weaving

[0058] Adjust the guide yarn position to control the output order of the outer layer yarn, the middle layer yarn and the inner layer yarn for weaving, the weaving method structure is consistent with example 1, 3D jersey fabric is woven by circular knitting machine, and the fabric is washed, shaped and prepared to obtain a sweat mark free 3D jersey fabric, in which the wrapped structure yarn is outside, the hydrophilic cotton yarn is in the middle, and the waterproof yarn is inside, and the fabric weight is 300±5g / m 2 .

[0059] Although the weaving method structure of example 3 is the same as that of example 1, and the density and gram number are also similar, the hydrophilic cotton yarn in the outer layer wrapped structure yarn is finer, although the sweat mark free test effect is slightly better, but after absorbing moisture, the water can evaporate through the pores and the hydrophilic cotton yarn in the wrapped structure yarn, the total area for water evaporation is reduced, resulting in a slightly lower drying rate than example 1, which shows that the clever design of the count of the 3D sweat mark free jersey fabric also plays a key role in the sweat mark free effect and the drying rate.

[0060] Comparative example 1

[0061] A 20S waterproof cotton yarn + 40S hydrophilic cotton yarn + 50D / 48F cross-section polyester filament 3D jersey fabric

[0062] (S1) take 20S fine cotton siro compact spinning blank, after boiling and bleaching, add active dye for dyeing treatment, then add 10% waterproof agent, crosslinking agent 2% at 40℃ for 30min, dry yarn winding for standby;

[0063] (S2) Take 40S fine cotton compact spinning grey yarn, after boiling and bleaching, add active dye for dyeing treatment, then add 2% hydrophilic agent, 0.5% penetrant, treat at 40°C for 30 min, dry yarn at 100°C for winding;

[0064] (S3) Take 50D / 48F cross-section polyester yarn, after oil removal, add disperse dye for dyeing treatment, dry yarn for winding;

[0065] (S4) Adjust the position of the guide in the order of waterproof cotton yarn outside, hydrophilic cotton yarn in the middle, and cross-section polyester yarn inside, weave 3D flat knitting fabric with the same structure as Example 1, wash with water, set, and obtain 20S waterproof yarn outside, 40S hydrophilic cotton yarn in the middle, and 50D / 48F cross-section polyester yarn inside 3D flat knitting fabric, with fabric weight of 300±5g / m 2 .

[0066] The fabric made by Comparative Example 1 is also a 3D high-density fabric with inside, middle and outside layers, but the outer layer uses waterproof cotton yarn, and the water in the fabric can only evaporate through the small pores of the fabric, so the overall drying rate is not as good as that of Example 1-2.

[0067] Comparative Example 2

[0068] A 20S waterproof cotton yarn + 50D / 48F cross-section polyester yarn + 40S hydrophilic cotton yarn double-sided fabric

[0069] (S1) Take 20S fine cotton siro compact spinning grey yarn, after boiling and bleaching, add active dye for dyeing treatment, then add 10% waterproof agent, 2% crosslinking agent, treat at 40°C for 30 min, dry yarn at 130°C for winding;

[0070] (S2) Take 50D / 48F cross-section polyester yarn, after oil removal, add disperse dye for dyeing treatment, dry yarn for winding;

[0071] (S3) Take 40S fine cotton compact spinning grey yarn, after boiling and bleaching, add active dye for dyeing treatment, then add 2% hydrophilic agent, 0.5% penetrant, treat at 40°C for 30 min, dry yarn at 100°C for winding;

[0072] (S4) Take waterproof cotton yarn as outer fabric, hydrophilic cotton yarn as inner fabric, and cross-section polyester yarn as connecting yarn to connect the outer fabric and the inner fabric, adjust the front and back needle bed position to weave double-sided fabric, wash with water, set, and obtain 20S waterproof yarn outside, 50D / 72F cross-section polyester yarn in the middle, and 40S hydrophilic cotton yarn inside double-sided fabric, with fabric weight of 300±5g / m 2 .

[0073] Weaving structure:

[0074]

[0075] The fabric prepared by Comparative Example 2 is a traditional double-sided fabric. Although the inner layer fabric is hydrophilic cotton yarn, which makes the fabric have better sweat absorption effect, the outer layer fabric is waterproof cotton yarn, which causes the hydrophilic cotton yarn to swell after absorbing sweat, and the water can only evaporate on the outer surface through the small pores of the fabric, which is difficult to volatilize and dry outward, resulting in stuffy and poor air permeability of the fabric.

[0076] Comparative Example 3

[0077] A 20S waterproof cotton yarn + 40S hydrophilic cotton yarn + 50D / 48F cross-section polyester filament 3D flat needle fabric

[0078] (S1) Weave a 3D flat needle fabric with 20S cotton yarn as the outer layer yarn, 40S cotton yarn as the middle layer yarn, and 50D / 48F cross-section polyester filament as the inner layer yarn. The fabric prepared has a fabric weight of 300±5 g / m 2 , and the fabric is treated by oil removal, dyeing with reactive dyes for cotton and disperse dyes for polyester by adding active dyes.

[0079] (S2) Dip and pad the fabric with hydrophilic soft oil, and dry the fabric at 100°C.

[0080] (S3) Prepare a waterproof finishing agent with thickening agent 10 g / L, crosslinking agent 2 g / L, and waterproof agent 5 g / L, and coat it on one side of the outer layer cotton yarn by printing, and then set it at 175°C to obtain a fabric with hydrophilic inner layer and waterproof outer layer.

[0081] The fabric prepared by Comparative Example 3 has the same weaving structure as Example 1, but uses traditional printing to achieve the effect of one side being hydrophilic and the other side being hydrophobic. The overall drying rate of the fabric is not as good as that of Example 1, and the fabric has a hard and non-breathable hand feel.

[0082] Performance test results

[0083] 1. Sweat mark test:

[0084] The fabrics prepared by Examples 1-3 and Comparative Examples 1-3 were tested according to GB / T 21655.2-2019 "Textiles - Assessment of the moisture management performance - Part 2: Dynamic moisture transmission method". The results are shown in Table 1.

[0085] Table 1

[0086]

[0087] As shown in Table 1, the wetted inner layer of Examples 1-3 has a diffusion area of more than 22 mm within 3 seconds, and the fabric surface is not wet within 120 seconds. The inner and outer layers of the fabric of Example 1 are shown in Figs. 1-2, fully illustrates that examples 1-3 have excellent sweat mark-free performance, and the fabric of examples 1-3 has good performance stability before and after washing.

[0088] 2. Drying rate:

[0089] The fabrics prepared from example 1 and comparative examples 1-3 were tested according to GB / T 21655.1-2023 "Textiles - Assessment of the moisture management performance - Part 1: single unit combination test method", and the results are shown in Table 2 below:

[0090] Table 3

[0091]

[0092] The results in Table 2 prove that examples 1-3 have better drying speed than comparative examples 1-3, i.e. it can be illustrated that the moisture of the sweat mark-free 3D flat needle knitted fabric of the present scheme will not cause stuffiness due to long-term storage, but will evaporate faster.

[0093] From the above sweat mark-free test and drying rate, it can be seen that the present scheme ingeniously designs the 3D flat needle knitted fabric of the outer, middle and inner layers, uses the principle of visual difference, so that the sweat absorbed will not be shown, has good sweat mark-free effect, in addition, uses the water-repellent wrapped cotton yarn instead of ordinary hydrophobic polyester or general water-repellent cotton yarn as the surface layer, accelerates the evaporation rate of the surface layer moisture; the middle layer uses hydrophilic cotton to quickly absorb the moisture in the inner layer; the inner layer uses a special cross-section polyester to increase the water guiding capacity, and does not cause stuffiness and poor air permeability due to fiber swelling caused by water absorption, improves the wearing comfort of wet clothes.

[0094] The technical solutions provided by the present application are described in detail above, and specific examples are applied to explain the principles and implementation modes of the present application. The above examples are only used to help understand the method and core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above description should not be understood as a limitation of the present application.

Claims

1. A method for preparing a sweat mark free 3D flat knit fabric, characterized by, The following steps are involved: S1, yarn spare Preparation of outer yarn: taking cotton yarn, scalding and bleaching it, adding reactive dyes for dyeing, then adding hydrophilic additives for hydrophilic treatment or adding waterproof additives for waterproof treatment, and winding the dry yarns into bobbins to obtain hydrophilic cotton yarn and waterproof cotton yarn; covering the hydrophilic cotton yarn with the waterproof cotton yarn to obtain a covered structure yarn, which is used as the outer yarn for standby use; the count of the hydrophilic cotton yarn is higher than the count of the waterproof cotton yarn; Preparation of intermediate yarn: taking cotton yarn, scalding and bleaching it, adding reactive dyes for dyeing, then adding hydrophilic additives for hydrophilic treatment, winding the dry yarn into a bobbin to obtain hydrophilic cotton yarn as intermediate yarn for standby use, wherein the thickness of the intermediate yarn is finer than that of the outer yarn; Preparation of inner layer yarn: taking waterproof synthetic fiber yarn, removing oil, adding disperse dye for dyeing, winding dry yarn into bobbins to obtain waterproof yarn as inner layer yarn for standby use; the inner layer yarn is made of cross-section polyester yarn as the yarn; S2. Fabric weaving The position of the yarn guide is adjusted to control the output sequence of the outer yarn, the middle yarn and the inner yarn for weaving, the yarns are dropped into a vat for washing and the yarns are shaped, so as to obtain a sweat-proof 3D plain needle knitted fabric with the covering structure yarn on the outside, the hydrophilic cotton yarn in the middle and the waterproof yarn on the inside.

2. A process for making a sweat mark free 3D flat knit fabric as claimed in claim 1, wherein, The fabric has a gram weight of (220-300) ±5 g / m 2 .

3. A process for making sweat mark free 3D flat knit fabric as claimed in claim 1 wherein, The twist number of the hydrophilic cotton yarn of the outer layer yarn wrapped around the waterproof cotton yarn is 200-500 twists / m, the count of the hydrophilic cotton yarn of the outer layer yarn is 80S-200S, and the count of the waterproof cotton yarn of the outer layer yarn is 20S-50S.

4. The process for making sweat mark free 3D flat knit fabric as claimed in claim 1 wherein, The count of the intermediate yarn is 40S~80S.

5. The process for making sweat mark free 3D flat knit fabric according to any one of claims 1 to 4, wherein, The hydrophilic cotton yarn of the outer layer yarn is made of refined cotton compact spinning as the grey yarn, the waterproof cotton yarn of the outer layer yarn is made of refined cotton siro compact spinning as the grey yarn; the intermediate yarn is made of refined cotton compact spinning as the grey yarn.

6. The process for making a sweat mark free 3D flat knit fabric according to any one of claims 1 to 4, characterized in that, The dosage of the hydrophilic additive in S1 includes: 0.1-3% of hydrophilic agent and 0.1-1.5% of penetrant.

7. The process for making a sweat mark free 3D flat knit fabric according to any one of claims 1 to 4, characterized in that, The waterproofing auxiliary agent in S1 includes: 1-20% waterproofing agent, 0.1-3% cross-linking agent, and 0.01-0.1% acetic acid.

8. The process for making a sweat mark free 3D flat knit fabric according to any one of claims 1 to 4, characterized in that, The hydrophilic treatment and waterproof treatment in S1 are performed by adding corresponding auxiliaries to the yarn dyeing machine and treating the yarn at 40-60° C. for 10-60 minutes.

9. A sweat mark free 3D flat knit fabric characterized in that, It is prepared by the preparation method of the sweat-free 3D plain knitted fabric described in any one of claims 1 to 8, and the fabric is a 3D plain knitted fabric with a coated structural yarn as the outer layer yarn, a hydrophilic cotton yarn as the middle yarn, and a waterproof yarn as the inner layer yarn; the coated structural yarn includes a core yarn and a coating yarn, and the coating yarn is spirally wound around the core yarn to form an incomplete coverage, the core yarn is waterproof cotton yarn, and the coating yarn is hydrophilic cotton yarn, and the count of the hydrophilic cotton yarn is higher than the count of the waterproof cotton yarn; the thickness of the middle yarn is finer than the thickness of the outer layer yarn.

Images