All-cotton moisture-absorption quick-dry fabric and preparation method thereof

Abstract

The invention relates to the technical field of fabrics, and particularly discloses an all-cotton moisture-absorbing and quick-drying fabric and a preparation method thereof. The preparation method comprises the following steps: S1, boiling and bleaching a cotton blank yarn, adding a reactive dye for dyeing treatment, then adding a hydrophilic auxiliary agent for hydrophilic treatment, and winding a dry yarn to obtain a hydrophilic cotton yarn for later use; boiling and bleaching the cotton blank yarn, adding a reactive dye for dyeing treatment, then adding a waterproof auxiliary agent for waterproof treatment, and winding dry yarn to obtain waterproof cotton yarn for later use; s2, the waterproof cotton yarn is coated with hydrophilic cotton yarn, and yarn of a coating structure is obtained; s3, weaving plain knitted fabric from the yarn with the wrapping structure through a circular knitting machine; the number of the hydrophilic cotton yarns is different from that of the waterproof cotton yarns, and the ratio of the hydrophilic cotton yarns to the waterproof cotton yarns is 0.25-1. According to the invention, the special wrapping structure yarn in which the hydrophilic cotton yarn with lower count wraps the waterproof cotton yarn with higher count is adopted for plain weaving, so that not only are the advantages of softness and breathability of a single-layer cotton knitted fabric reserved, but also the moisture absorption performance is good.

Description

Technical Field

[0001] The invention relates to the technical field of fabrics, and specifically discloses a pure cotton moisture-absorbing quick-drying fabric and a preparation method thereof. Background Art

[0002] The existing preparation methods of moisture-absorbing and quick-drying knitted fabrics mainly focus on physical modification and chemical modification to improve the wicking effect from the perspective of raw materials. Physical modification is to change the shape of the spinneret hole to achieve profiling and increase the fiber surface area, which is not suitable for natural fibers and has poor wearing comfort; while chemical modification is to introduce hydrophilic groups, and the modification cost is relatively high. The structure is mainly single-layer and double-layer tissues. The single-layer structure still needs to be applied to the interweaving of heterogeneous cross-section fibers and hydrophilic cotton, using the principle of wicking effect of wick points, and the comfort is average; the double-layer tissue generally uses differential capillary effect and gradient wetting effect to develop moisture-absorbing and quick-drying fabrics, which are relatively thick and have poor air permeability. Paste point printing is used to make one-sided waterproof to achieve one-way moisture conduction, but the fabric feels worse and becomes harder.

[0003] Cotton absorbs moisture well, but its physical form changes during the process. The flat cavity expands due to moisture absorption, causing water vapor to gather between the skin and the inner layer of the fabric, causing discomfort on the body surface; waterproofing cotton yarn will reduce its ability to absorb water. It is a big challenge to retain the advantages of single-layer cotton fabrics that are breathable and skin-friendly, while not giving up their soft properties due to printing. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a pure cotton moisture-absorbing quick-drying fabric and a preparation method thereof.

[0005] The moisture-absorbing and quick-drying fabric of the present invention uses pure cotton yarn, and uses hydrophilic and hydrophobic treatments and different yarn counts to increase the difference in moisture absorption of cotton fibers in the fabric; the core layer cotton yarn is waterproofed to avoid the high moisture regain of cotton itself, and achieves a functional effect completely opposite to that of the outer layer hydrophilic cotton yarn; by designing the count of the outer layer hydrophilic cotton yarn and forming different ratios with the count of the waterproof cotton yarn, the optimal moisture absorption and quick-drying function is achieved. When the proportion of the hydrophilic cotton yarn is too high, the fabric as a whole cannot achieve rapid evaporation of moisture, that is, it affects the drying rate, and if the proportion of the waterproof cotton yarn is too high, it will lead to poor water absorption; the low-count hydrophilic cotton yarn is coated on the outside to facilitate moisture absorption, and then the wicking capillary effect is formed through the waterproof cotton yarn coated in the middle, and moisture is quickly brought to the outer layer cotton yarn, realizing the wetting-moisture absorption-diffusion-evaporation process, preventing moisture from accumulating in the inner layer of the fabric and causing discomfort on the body surface. In addition, the covering yarn is an outer layer wrapped around the core yarn to form an incomplete coverage, and the hydrophilic cotton yarn is more suitable for covering the outside than the hydrophilic yarn as the core yarn, because it is protruding outside and has more contact points, which makes it easier to absorb moisture; the moisture is also easier to evaporate when it is transferred to the surface of the fabric. In this way, the all-cotton moisture-absorbing and quick-drying fabric of this scheme effectively avoids the heavy feeling brought by the moisture-absorbing and quick-drying woven double-sided fabric that needs to be realized through the weaving structure, and can be suitable for wearing in hot summer.

[0006] The specific technical solutions adopted are as follows:

[0007] In one aspect, the present invention discloses a method for preparing a pure cotton moisture-absorbing quick-drying fabric, comprising the following steps:

[0008] S1. Yarn pretreatment

[0009] Take cotton yarn, cook and bleach it, add active dyes to dye it, then add hydrophilic additives to treat it hydrophilically, wind the dry yarn into a bobbin to obtain hydrophilic cotton yarn for later use;

[0010] Take cotton yarn, cook and bleach it, add active dyes to dye it, then add waterproofing agents to waterproof it, wind the dry yarn into a bobbin to obtain waterproof cotton yarn, and set it aside;

[0011] S2. Preparation of coated structural yarn

[0012] The hydrophilic cotton yarn is coated on the waterproof cotton yarn to obtain a coated structure yarn, wherein the count of the hydrophilic cotton yarn is different from the count of the waterproof cotton yarn, and the ratio of the hydrophilic cotton yarn to the waterproof cotton yarn is 0.25 to 1;

[0013] S3, woven fabrics

[0014] The covered structure yarn is woven into plain knitted fabric by a large circular machine, washed in a vat to remove oil stains, shaped and added with hydrophilic soft oil to obtain a pure cotton moisture-absorbing quick-drying fabric.

[0015] Preferably, the ratio of the hydrophilic cotton yarn to the waterproof cotton yarn in the fabric in S3 is (60-80): (20-40).

[0016] Preferably, the number of twists of the hydrophilic cotton yarn wrapped around the waterproof cotton yarn in the coated structural yarn is 200 to 600 twists / m.

[0017] Preferably, the number of twists of the hydrophilic cotton yarn wrapped around the waterproof cotton yarn is X, the ratio of the hydrophilic cotton yarn count to the waterproof cotton yarn count is Y, and X / Y=18.75-25.

[0018] Preferably, the count of the hydrophilic cotton yarn is 20S to 80S, and the count of the waterproof cotton yarn is 80S.

[0019] Preferably, the hydrophilic additive dosage components in S1 include: 0.1-3% of hydrophilic agent and 0.1-1.5% of penetrant.

[0020] Preferably, the waterproofing auxiliary agent dosage components in S1 include: 1-20% waterproofing agent, 0.1-3% cross-linking agent, and 0.01-0.1% acetic acid.

[0021] Preferably, the hydrophilic treatment and waterproof treatment in S1 is to add corresponding auxiliaries to the yarn dyeing machine and treat at 40-60°C for 10-60 minutes.

[0022] Preferably, the hydrophilic cotton yarn in S1 is made of fine cotton compact siro-spun yarn as the grey yarn, and the waterproof cotton yarn is made of fine cotton compact spun yarn as the grey yarn.

[0023] On the other hand, the present invention discloses a pure cotton moisture-absorbing quick-drying fabric, which is a plain knitted fabric woven with a coated structure yarn, the coated yarn structure includes a core yarn and a coated yarn, the coated yarn is spirally wound around the core yarn to form an incomplete coverage, the core yarn is waterproof cotton yarn, and the coated yarn is hydrophilic cotton yarn, the count of the hydrophilic cotton yarn is different from the count of the waterproof cotton yarn, and the ratio between the two is 0.25 to 1.

[0024] Compared with the prior art, the present invention has at least the following beneficial effects:

[0025] The present invention adopts pure cotton yarn to weave fabrics and avoids the use of polyester. Compared with the preparation of ordinary moisture-absorbing and quick-drying fabrics on the market, it is more environmentally friendly. Dyeing and processing both adopt lower temperatures, and only use fewer high-temperature processes to reduce energy consumption. Moreover, the pure cotton fabric is more skin-friendly. By using a special coating structure yarn with a lower count of hydrophilic cotton yarn covering a higher count of waterproof cotton yarn for plain weaving, it retains the softness and breathability of a single-layer cotton knitted fabric while having good moisture absorption performance, and is particularly suitable for wearing in hot summer environments. DETAILED DESCRIPTION

[0026] 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 in conjunction with specific implementation methods.

[0027] The hydrophilic agent involved in the following examples and comparative examples is quaternary ammonium salt modified polysiloxane, the penetrant is a nonionic surfactant, the waterproofing agent is an acrylic copolymer type fluorine-free waterproofing agent, and the crosslinking agent is a mixture of blocked polyurethane and fatty alcohol polyoxyethylene ether, all of which are commercially available products.

[0028] Example 1

[0029] A pure cotton moisture-absorbing quick-drying fabric, the preparation method of which is as follows:

[0030] S1. Yarn pretreatment

[0031] Take 20S fine cotton compact siro-spun yarn, simmer and bleach, add 2 owf% of active dye for dyeing, then add 2% of hydrophilic agent and 0.5% of penetrant for hydrophilic treatment at 40°C for 30 minutes, dry the yarn at 100°C and wind it into a bobbin to obtain hydrophilic cotton yarn for standby use;

[0032] Take 80S fine cotton compact spinning yarn, after boiling and bleaching, add 2owf% of active dye for dyeing, then add 10% of waterproofing agent, 2% of cross-linking agent and 0.05% of acetic acid, carry out waterproofing treatment at 40℃ for 30min, dry yarn winding at 130℃ to obtain waterproof cotton yarn, and set aside;

[0033] S2. Preparation of coated structural yarn

[0034] The hydrophilic cotton yarn is wrapped around the waterproof cotton yarn at a twist of 400 times / m to obtain a wrapped structure yarn;

[0035] S3, woven fabrics

[0036] The coated structural yarn is woven into plain knitted fabric using a large circular machine, and the fabric is washed in a vat to remove oil stains. After shaping, 5g / L of hydrophilic soft oil is added to obtain a pure cotton moisture-absorbing and quick-drying fabric, in which the hydrophilic cotton yarn accounts for about 80% and the waterproof cotton yarn accounts for about 20%.

[0037] Example 2

[0038] A pure cotton moisture-absorbing quick-drying fabric, the preparation method of which is as follows:

[0039] S1. Yarn pretreatment

[0040] Take 30S fine cotton compact siro-spun yarn, simmer and bleach, add 2 owf% of active dye for dyeing, then add 2% of hydrophilic agent and 0.5% of penetrant for hydrophilic treatment at 40°C for 30 minutes, dry the yarn at 100°C and wind it into a bobbin to obtain hydrophilic cotton yarn for standby use;

[0041] Take 80S fine cotton compact spinning yarn, after boiling and bleaching, add 2owf% of active dye for dyeing, then add 10% of waterproofing agent, 2% of cross-linking agent and 0.05% of acetic acid, carry out waterproofing treatment at 40℃ for 30min, dry yarn winding at 130℃ to obtain waterproof cotton yarn, and set aside;

[0042] S2. Preparation of coated structural yarn

[0043] The hydrophilic cotton yarn is wrapped around the waterproof cotton yarn at a twist of 500 turns / m to obtain a wrapped structure yarn;

[0044] S3, woven fabrics

[0045] The coated structural yarn is woven into plain knitted fabric using a large circular machine, and the fabric is washed in a vat to remove oil stains. After shaping, 5g / L of hydrophilic soft oil is added to obtain a pure cotton moisture-absorbing and quick-drying fabric. The hydrophilic cotton yarn accounts for about 73% and the waterproof cotton yarn accounts for about 27%.

[0046] Example 3

[0047] A pure cotton moisture-absorbing quick-drying fabric, the preparation method of which is as follows:

[0048] S1. Yarn pretreatment

[0049] Take 40S fine cotton compact siro-spun yarn, simmer and bleach, add 2 owf% of active dye for dyeing, then add 2% of hydrophilic agent and 0.5% of penetrant for hydrophilic treatment at 40°C for 30 minutes, dry the yarn at 100°C and wind it into a bobbin to obtain hydrophilic cotton yarn for standby use;

[0050] Take 80S fine cotton compact spinning yarn, after boiling and bleaching, add 2owf% of active dye for dyeing, then add 10% of waterproofing agent, 2% of cross-linking agent and 0.05% of acetic acid, carry out waterproofing treatment at 40℃ for 30min, dry yarn winding at 130℃ to obtain waterproof cotton yarn, and set aside;

[0051] S2. Preparation of coated structural yarn

[0052] The hydrophilic cotton yarn is wrapped around the waterproof cotton yarn at a twist of 600 turns / m to obtain a wrapped structure yarn;

[0053] S3, woven fabrics

[0054] The coated structural yarn is woven into plain knitted fabric using a large circular machine, and the fabric is washed in a vat to remove oil stains. After shaping, 5g / L of hydrophilic soft oil is added to obtain a pure cotton moisture-absorbing and quick-drying fabric. The hydrophilic cotton yarn accounts for about 67% and the waterproof cotton yarn accounts for about 33%.

[0055] Comparative Example 1

[0056] A 16S / 80S fine cotton-packaged waterproof fine cotton plain weave fabric, the preparation method of which is as follows:

[0057] S1. Yarn pretreatment

[0058] Take 16S fine cotton compact siro-spun grey yarn, simmer and bleach, add 2 owf% of active dye for dyeing, then add 2% of hydrophilic agent and 0.5% of penetrant for hydrophilic treatment at 40°C for 30 minutes, dry the yarn at 100°C and wind it into a bobbin to obtain hydrophilic cotton yarn for standby use;

[0059] Take 80S fine cotton compact spinning yarn, after boiling and bleaching, add 2owf% of active dye for dyeing, then add 10% of waterproofing agent, 2% of cross-linking agent and 0.05% of acetic acid, carry out waterproofing treatment at 40℃ for 30min, dry yarn winding at 130℃ to obtain waterproof cotton yarn, and set aside;

[0060] S2. Preparation of coated structural yarn

[0061] The hydrophilic cotton yarn is wrapped around the waterproof cotton yarn at a twist of 400 times / m to obtain a wrapped structure yarn;

[0062] S3, woven fabrics

[0063] The coated structural yarn is woven into plain knitted fabric by a large circular machine, and the oil stains are washed off in a vat, and 5g / L of hydrophilic softening oil is added to fix the fabric to obtain a 16S / 80S fine cotton package waterproof fine cotton plain fabric, in which the hydrophilic cotton yarn accounts for about 85% and the waterproof cotton yarn accounts for about 15%.

[0064] Comparative Example 2

[0065] A 40S hydrophilic fine cotton-bundled 50D / 48F polyester plain weave fabric, the preparation method of which is as follows:

[0066] S1. Yarn pretreatment

[0067] Take 40S fine cotton compact siro-spun yarn, simmer and bleach, add 2 owf% of active dye for dyeing, then add 2% of hydrophilic agent and 0.5% of penetrant for hydrophilic treatment at 40°C for 30 minutes, dry the yarn at 100°C and wind it into a bobbin to obtain hydrophilic cotton yarn for standby use;

[0068] Take 50D / 48F polyester yarn, remove oil, add disperse dyes for dyeing, wind dry yarn into a bobbin to obtain waterproof polyester yarn for later use;

[0069] S2. Preparation of coated structural yarn

[0070] The hydrophilic cotton yarn is wrapped around the waterproof polyester yarn with a twist of 600 times / m to obtain a wrapped structure yarn;

[0071] S3, woven fabrics

[0072] The coated structural yarn is woven into plain knitted fabric by a large circular machine, washed in a vat to remove oil stains, and 5g / L of hydrophilic softening oil is added to fix the fabric to obtain 40S hydrophilic fine cotton-covered 50D / 48F polyester plain fabric, in which the hydrophilic cotton yarn accounts for about 75% and the polyester accounts for about 15%.

[0073] Comparative Example 3

[0074] A fabric of 80S / 20S waterproof cotton yarn wrapped with hydrophilic cotton yarn, and its preparation method is as follows:

[0075] S1. Yarn pretreatment

[0076] Take 80S fine cotton compact spinning yarn, after boiling and bleaching, add 2owf% of active dye for dyeing, then add 10% of waterproofing agent, 2% of cross-linking agent and 0.05% of acetic acid, carry out waterproofing treatment at 40℃ for 30min, dry yarn winding at 130℃ to obtain waterproof cotton yarn, and set aside;

[0077] Take 20S fine cotton compact siro-spun yarn, simmer and bleach, add 2 owf% of active dye for dyeing, then add 2% of hydrophilic agent and 0.5% of penetrant for hydrophilic treatment at 40°C for 30 minutes, dry the yarn at 100°C and wind it into a bobbin to obtain hydrophilic cotton yarn for standby use;

[0078] S2. Preparation of coated structural yarn

[0079] The waterproof cotton yarn is wrapped around the hydrophilic cotton yarn at a twist of 1500 times / m to obtain a wrapped structure yarn;

[0080] S3, woven fabrics

[0081] The coated structural yarn is woven into plain knitted fabric by a large circular machine, and the oil stains are washed off by washing in a vat. After shaping, 5g / L of hydrophilic soft oil is added to obtain 80S / 20S waterproof cotton yarn wrapped in hydrophilic cotton yarn fabric. The proportion of hydrophilic cotton yarn to waterproof cotton yarn is about 75% and the proportion of waterproof cotton yarn is about 25%.

[0082] Performance test results

[0083] Moisture absorption and quick drying test

[0084] The fabrics prepared in Examples 1-3 and Comparative Example 1 were tested according to GB / T 21655.1-2023 "Evaluation of Moisture Absorption and Quick-Drying Properties of Textiles Part 1: Single Item Combination Test Method", and the results are shown in Table 1:

[0085] Table 1. Moisture absorption and quick drying performance test results

[0086]

[0087] According to the classification of performance indicators, it can be found that the embodiments all meet the functional indicators of moisture absorption and quick drying specified in national standards. The fabrics woven in Examples 1-3 all have good moisture absorption and quick drying effects, and retain the advantages of single-layer cotton knitted fabrics being soft and breathable. Dyeing and processing all use lower temperatures, only use fewer high-temperature processes, reduce energy consumption, use all-cotton yarn, avoid the use of polyester, and are more environmentally friendly and skin-friendly than ordinary moisture absorption and quick-drying fabrics. In summer, a lot of sweating can quickly diffuse sweat from the body surface to the outer surface of the fabric, reducing discomfort. Among them, Example 1 is better than Examples 2-3 in comprehensive performance. This is due to the yarn structure presented by the special matching of the count ratio between the hydrophilic cotton yarn and the waterproof cotton yarn and the number of twists of the coating, so that the coverage of the hydrophilic coated yarn wrapped on the core yarn and the protruding contact points of the hydrophilic cotton yarn are better matched to achieve the best state of water absorption and conduction evaporation effect.

[0088] The difference between Comparative Example 1 and Example 1 is that the count of its core yarn is too low. Although it absorbs water well, it will lead to an increase in the proportion of waterproof cotton yarn, affecting the moisture conduction capacity and causing the quick-drying effect to deteriorate. This shows that the reason why the all-cotton moisture-absorbing and quick-drying fabric of this scheme has the advantages of good softness, quick-drying and breathability is that the key lies not only in the structure of hydrophilic cotton yarn covering waterproof cotton yarn, but also in the special design requirements for the ratio of the counts of hydrophilic cotton yarn and waterproof cotton yarn.

[0089] The difference between Comparative Example 2 and Example 1 is that polyester yarn is used instead of waterproof cotton yarn. Although its performance just meets the minimum standard of national standard for moisture absorption and quick drying, its water absorption capacity and moisture conduction capacity are obviously poorer than the pure cotton fabric of the embodiment. When the body sweats a lot in summer, the sweat discharge is slow and the wearing feeling is poor. This shows that the pure cotton fabric of this scheme is better than the existing polyester-blended fabric.

[0090] Although the proportion of hydrophilic cotton yarn in the fabric woven in Comparative Example 3 is similar to that in Example 2, its coated yarn structure is opposite to that in Example 2. The performance in actual tests is worse than that in Example 2. This may be due to the poor water absorption of the waterproof cotton yarn coated on the outside, which leads to a lower sweat absorption rate, and the count and twist value result in a large degree of coverage of the waterproof cotton yarn on the outside and a small degree of spiral protrusion, resulting in poor moisture diffusion and evaporation effects. This shows that the special yarn structure composed of the count of the hydrophilic cotton yarn and the waterproof cotton yarn of this scheme, as well as the twist value of the coating, is critical to the moisture absorption and quick-drying performance of the woven fabric.

[0091] The technical solution provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for preparing a pure cotton moisture-absorbing quick-drying fabric, characterized in that: The following steps are involved: S1. Yarn pretreatment Take cotton yarn, cook and bleach it, add active dyes to dye it, then add hydrophilic additives to treat it hydrophilically, wind the dry yarn into a bobbin to obtain hydrophilic cotton yarn for later use; Take cotton yarn, cook and bleach it, add active dyes to dye it, then add waterproofing agents to waterproof it, wind the dry yarn into a bobbin to obtain waterproof cotton yarn, and set it aside; S2. Preparation of coated structural yarn The hydrophilic cotton yarn is coated on the waterproof cotton yarn to obtain a coated structure yarn, wherein the count of the hydrophilic cotton yarn is different from the count of the waterproof cotton yarn, and the ratio of the hydrophilic cotton yarn to the waterproof cotton yarn is 0.25 to 1; S3, woven fabrics The coated structural yarn is woven into a plain knitted fabric, which is washed in a vat to remove oil stains, and is shaped and added with hydrophilic soft oil to obtain a pure cotton moisture-absorbing and quick-drying fabric.

2. The method for preparing the pure cotton moisture-absorbing quick-drying fabric according to claim 1, characterized in that: The proportion of the hydrophilic cotton yarn and the waterproof cotton yarn in the fabric in S3 is (60-80): (20-40).

3. The method for preparing the pure cotton moisture-absorbing quick-drying fabric according to claim 2, characterized in that: The number of twists of the hydrophilic cotton yarn wrapped around the waterproof cotton yarn in the coated structural yarn is 200 to 600 twists / meter.

4. The method for preparing the pure cotton moisture-absorbing quick-drying fabric according to claim 3, characterized in that: The number of twists of the hydrophilic cotton yarn wrapped around the waterproof cotton yarn is X, the ratio of the hydrophilic cotton yarn count to the waterproof cotton yarn count is Y, and X / Y=25.

5. The method for preparing the pure cotton moisture-absorbing and quick-drying fabric according to any one of claims 1 to 4, characterized in that: The count of the hydrophilic cotton yarn is 20S-80S, and the count of the waterproof cotton yarn is 80S.

6. The method for preparing the pure cotton moisture-absorbing and quick-drying fabric according to any one of claims 1 to 4, characterized in that: The hydrophilic additive dosage components in S1 include: 0.1-3% of hydrophilic agent and 0.1-1.5% of penetrant.

7. The method for preparing the pure cotton moisture-absorbing and quick-drying fabric according to any one of claims 1 to 4, characterized in that: The waterproofing auxiliary agent dosage components in S1 include: 1-20% waterproofing agent, 0.1-3% cross-linking agent, and 0.01-0.1% acetic acid.

8. The method for preparing the pure cotton moisture-absorbing quick-drying 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 at 40-60° C. for 10-60 minutes.

9. The method for preparing the pure cotton moisture-absorbing quick-drying fabric according to any one of claims 1 to 4, characterized in that: The hydrophilic cotton yarn in S1 is made of fine cotton compact siro-spun yarn as the raw yarn, and the waterproof cotton yarn is made of fine cotton compact spun yarn as the raw yarn.

10. A pure cotton moisture-absorbing quick-drying fabric, characterized in that: The fabric is a plain knitted fabric woven with a covering structure yarn, the covering yarn structure includes a core yarn and a covering yarn, the covering yarn is spirally wound around the core yarn to form an incomplete coverage, the core yarn is a waterproof cotton yarn, the covering yarn is a hydrophilic cotton yarn, the count of the hydrophilic cotton yarn is different from the count of the waterproof cotton yarn, and the ratio between the two is 0.25 to 1.

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