All-cotton knitted denim washing style fabric and preparation method thereof

Abstract

The invention relates to the technical field of textile fabrics, and particularly discloses an all-cotton knitted denim washing style fabric and a preparation method thereof. The method comprises the following steps that S1, when high-count fine cotton yarn is spun, the weight of yarn wax accounts for 0.5-2% of the weight of the cotton yarn, and the waxed high-count fine cotton yarn is subjected to core-spun into low-count coarse cotton yarn through the core-spun yarn technology; s2, the obtained covering yarn is woven into a twill single face; s3, singeing; s4, performing fabric bleaching pretreatment by using hydrogen peroxide caustic soda; s5, shaping the dry cloth; s6, after the fabric padded with the dye liquor is piled and colored in a constant-temperature room, surface flooding is washed away; s7, drying the soaped fabric in a setting machine; and S8, stone milling and enzyme washing. According to the woven jean fabric, the problems that a traditional woven jean fabric is poor in air permeability, elasticity and fastness are solved, and meanwhile the problems that in an existing knitted jean production technology, a stone mill enzyme washing style cannot be used for production, and a washing water style is low in layering sense compared with traditional jean are solved.

Description

Technical Field

[0001] The invention relates to the technical field of textile fabrics, and specifically discloses a pure cotton knitted denim washed style fabric and a preparation method thereof. Background Art

[0002] Denim fabric has always been a favorite fabric for consumers, but nowadays denim fabric is still mainly woven. Because of some pain points of woven fabric, such as poor elasticity and breathability, and the large amount of pollution in the fabric production process, knitted denim fabric that can solve these pain points has become a research focus.

[0003] However, there are two major problems in the research scope of knitted denim. First, the traditional denim washing process, such as stone mill fermentation washing, is mainly suitable for woven denim. However, due to the differences in its organizational structure and physical properties, it is difficult to make an ideal washed denim style by using the traditional denim stone mill fermentation washing method, resulting in its washing style not being as comprehensive as the traditional one. Second, the whitening effect and layering effect of knitted denim fabrics are obviously insufficient. These two points restrict the development of knitted denim fabrics. 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 knitted denim washed style fabric and a preparation method thereof.

[0005] On the one hand, the present invention protects a method for preparing a pure cotton knitted denim washed style fabric, which adopts the following technical scheme:

[0006] A method for preparing a pure cotton knitted denim washed style fabric comprises the following steps:

[0007] S1. Spinning: When spinning high-count fine cotton yarn, increase the waxing ratio so that the weight of the yarn wax accounts for 0.5-2% of the weight of the cotton yarn, and use the core-spun yarn technology to core-spun the waxed high-count fine cotton yarn into a lower-count coarse cotton yarn;

[0008] S2, weaving, using the obtained core-spun yarn to weave twill single-sided fabric or jacquard single-sided fabric, the surface texture of this structure of fabric is similar to that of traditional denim fabric;

[0009] S3, singeing, using a singeing machine to singe the woven fabric on both sides;

[0010] S4, bleaching, using hydrogen peroxide and caustic soda to pre-bleach the woven fabric;

[0011] S5, shaping, using a shaping machine to dry the cloth;

[0012] S6, dyeing, the dried fabric is dyed, the fabric after padding dyeing liquid is piled up in a constant temperature room for coloring, and then the floating color on the surface is washed off;

[0013] S7, drying, the soap washed fabric is dried in a setting machine;

[0014] S8, stone mill enzyme washing, the fabric is enzyme washed while adding pumice for water washing process, and finally washed and dried.

[0015] Preferably, in S4, an open-width scouring and bleaching machine is used to perform a bleaching pre-treatment process on the woven fabric.

[0016] Preferably, in S4, the process of the open width scouring and bleaching machine is:

[0017] Machine speed 30~60m / min;

[0018] Demining box: 60-90℃, stacking for 5-10min;

[0019] Stacking box: 101℃~105℃, stacking: 8min~16min;

[0020] Auxiliary formula: 15-30g / L caustic soda solution (38Be), 15-40g / L H 2 O 2 (50%), 3-10 g / L fatty alcohol penetrant;

[0021] Rinse box: 60-95℃, stay 5-14min.

[0022] By adopting the above technical scheme, because the open-width bleaching machine equipment has smaller scouring force and less water flow than the traditional overflow dyeing tank, and the waxed yarn is used as the core yarn, the pre-treatment will not remove the yarn wax of the core yarn, but hydrogen peroxide and caustic soda can penetrate into the interior of the yarn through the capillary effect of the yarn surface hairiness under high temperature conditions, thereby achieving the bleaching effect.

[0023] Preferably, in S1, the count of the cotton yarn used as the core yarn is 40S / 1 to 80S / 1, and the count of the cotton yarn used as the core-spun yarn is 16S / 1 to 40S / 1.

[0024] Preferably, in S1, the weight of the yarn wax accounts for 1% of the weight of the cotton yarn.

[0025] Preferably, in S1, the yarn wax is paraffin or chlorinated paraffin.

[0026] Preferably, in S1, the process parameters of stone mill fermentation washing are:

[0027] Enzyme powder: 1-6g / L,

[0028] Enzyme water: 1-6g / L,

[0029] 1-3cm pumice stone: 1-10kg,

[0030] Bath ratio: 3-10,

[0031] Temperature: 50℃,

[0032] Time: 45±5min.

[0033] Preferably, in S6, reactive dyes are used for cold pad-batch dyeing, and the process parameters of cold pad-batch dyeing are:

[0034] Machine speed 20~60m / min,

[0035] Reactive dye solution: 5~100g / L,

[0036] Sodium silicate alkali solution: 10-50g / L,

[0037] Left, middle and right PADDER pressure: 2bar, 3bar, 2bar.

[0038] Preferably, in S6, the fabric after padding with dye liquor is piled in a constant temperature room at 20-30° C. for 12-24 hours, and then washed with a rope washing machine at 60-98° C. using 2-10 g / L of soaping agent to remove floating color on the surface.

[0039] By adopting the above technical scheme, during the dyeing process, the core yarn contains a large amount of yarn wax, which hinders the dye solution from diffusing into the core yarn at room temperature. Finally, the core yarn is still white or very light, while the outer layer of the yarn is dyed a darker color, forming a more distinct color difference. When the denim is stone-milled and fermented, the outer layer of the core yarn is worn off to expose the white yarn inside, forming a distinct washing style.

[0040] Preferably, in S5, the temperature is set at 125° C. to 175° C., and the machine speed is set at 15 to 35 m / min for drying the cloth.

[0041] On the other hand, the present invention protects a pure cotton knitted denim washed style fabric, which is obtained by the above-mentioned preparation method of the pure cotton knitted denim washed style fabric.

[0042] Compared with the prior art, the present invention has at least the following beneficial effects:

[0043] The invention increases the waxing ratio, which is used for weaving core-spun yarn on the one hand, and cooperates with the boiling and bleaching process of hydrogen peroxide sintering and the stone mill fermentation washing process on the other hand, so that the core yarn is bleached while the core yarn is prevented from being dyed, so that the outer layer of the yarn and the core yarn form a denim washing style with distinct color difference between light and dark, and the washed white has a richer sense of hierarchy, which can be comparable to traditional woven denim fabrics. The invention solves the pain points of traditional woven denim fabrics, such as poor air permeability, poor elasticity and poor fastness, and at the same time makes up for the problem that the stone mill fermentation washing style cannot be produced in the existing knitted denim production technology, and the washing style has a lower sense of hierarchy than traditional denim. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a schematic diagram of the all-cotton knitted denim washed style fabric of this embodiment 1. DETAILED DESCRIPTION

[0045] 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.

[0046] Example 1

[0047] A method for preparing a pure cotton knitted denim washed style fabric comprises the following steps:

[0048] S1, spinning, when spinning the 40S / 1 high-count fine cotton yarn, increase the waxing ratio, so that the weight of the yarn wax accounts for 1% of the weight of the cotton yarn, and then use the core-spun yarn technology to core-spun the waxed high-count fine cotton yarn into 18S / 1 low-count coarse cotton yarn;

[0049] S2, weaving, using the obtained core-spun yarn, weaving into a cloth with a specification of 66 inches and 240g / m 2 Twill single-sided fabric;

[0050] S3, singeing, the woven grey cloth is singed on both sides by a singeing machine, and the surface of the fabric is smooth after singeing;

[0051] S4, bleaching, using open-width scouring and bleaching machine to pre-bleach the woven fabric with hydrogen peroxide and caustic soda. The process of open-width scouring and bleaching machine:

[0052] Machine speed: 40m / min;

[0053] Demining box: 80℃, stacking for 5min;

[0054] Stacking box: 101℃, stacking: 14min;

[0055] Auxiliary formula: 18g / L caustic soda solution (38Be), 23g / L H 2 O 2 (50%), 3g / L fatty alcohol penetrant;

[0056] Rinse box: 90℃, stay for 8min;

[0057] S5, shaping, use a shaping machine to dry the cloth, set the temperature to 175℃, and set the machine speed to 35m / min for drying;

[0058] S6, dyeing, the fabric after drying is dyed, cold pad-batch dyeing process:

[0059] Machine speed 40m / min,

[0060] Reactive dye solution: 50g / L,

[0061] Sodium silicate alkali solution: 50g / L,

[0062] Left, middle and right PADDER pressure: 2bar, 3bar, 2bar;

[0063] After the fabrics were dipped in the dye solution, they were piled in a constant temperature room at 26°C for 18 hours, and then washed with a rope washing machine at 80°C using 5g / L of soaping agent to remove the floating color on the surface;

[0064] S7, drying, the soap washed fabric is placed in a setting machine, the temperature is set to 175°C, and the machine speed is set to 35m / min for drying;

[0065] S8, stone mill fermentation washing, put the clothes or fabrics into the following working solution:

[0066] Enzyme powder: 1-6g / L,

[0067] Enzyme water: 1-6g / L,

[0068] 1-3cm pumice stone: 1-10kg,

[0069] Bath ratio: 3-10,

[0070] Then wash at 50℃ for 45min, then wash once with cold water at a bath ratio of 3-10 and dry to obtain a pure cotton knitted denim washed style fabric. The fabric effect is shown in Figure 1 .

[0071] In step S2, the weaving structure diagram of the fabric production is shown in Table 1:

[0072] Table 1

[0073]

[0074] Among them, “∧” means the needle forms a loop, and “-” means no knitting.

[0075] The finished fabrics obtained in the above examples were tested for fastness, and the results are shown in Table 2.

[0076] Table 2

[0077]

[0078]

[0079] The soap staining test mainly simulates the possibility of dyes falling off the fabric and transferring to other light-colored clothes washed with the same textile during the washing process. The smaller the value usually means the worse the color fastness, that is, the fabric is more likely to fade or transfer the color to other fabrics during the washing process.

[0080] The all-cotton knitted denim washed style fabric produced by the process of the present invention utilizes the yarn wax in the core-spun yarn to protect the internal yarn, and combines the hydrogen peroxide caustic soda pre-treatment of the open-width scouring and bleaching machine, so that the internal yarn is bleached after pre-treatment without being dyed by reactive dyes to maintain the original color, so that after stone mill enzyme washing, the outer layer of the core-spun yarn is worn off to expose the white yarn inside, forming a washed style with distinct layers. Since the process of the present invention does not need to achieve the denim washed style through repeated washing and fading like the traditional method, it can be seen from the above table that the denim fabric of the process of the present invention has higher color fastness, uses reactive dyes for dyeing, generates less pollution during the washed style processing, and discharges lower COD of sewage.

[0081] 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 knitted denim washed style fabric, characterized in that: The following steps are involved: S1. Spinning: When spinning high-count fine cotton yarn, increase the waxing ratio so that the weight of the yarn wax accounts for 0.5-2% of the weight of the cotton yarn, and use the core-spun yarn technology to core-spun the waxed high-count fine cotton yarn into a lower-count coarse cotton yarn; S2, weaving, using the obtained core-spun yarn to weave twill single-sided fabric or jacquard single-sided fabric; S3, singeing, using a singeing machine to singe the woven fabric on both sides; S4, bleaching, using hydrogen peroxide and caustic soda to pre-bleach the woven fabric; S5, shaping, using a shaping machine to dry the cloth; S6, dyeing, the dried fabric is dyed, the fabric after padding dyeing liquid is piled up in a constant temperature room for coloring, and then the floating color on the surface is washed off; S7, drying, the soap washed fabric is dried in a setting machine; S8, stone mill enzyme washing, the fabric is enzyme washed while adding pumice for water washing process, and finally washed and dried.

2. The method for preparing the all-cotton knitted denim washed style fabric according to claim 1, characterized in that: In S4, an open-width scouring and bleaching machine is used to perform a bleaching pre-treatment process on the woven fabric.

3. The method for preparing the all-cotton knitted denim washed style fabric according to claim 2, characterized in that: In S4, the process of the open width scouring and bleaching machine is as follows: Machine speed 30~60m / min; Demining box: 60-90℃, stacking for 5-10min; Stacking box: 101℃~105℃, stacking: 8min~16min; Auxiliary agent formula: 15-30g / L caustic soda solution (38Be), 15-40g / L H2O2 (50%), 3-10g / L fatty alcohol penetrant; Rinse box: 60-95℃, stay 5-14min.

4. The method for preparing the all-cotton knitted denim washed style fabric according to claim 1, characterized in that: In the above S1, the cotton yarn count as the core yarn is 40S / 1 to 80S / 1, and the cotton yarn count as the covering yarn is 16S / 1 to 40S / 1.

5. The method for preparing the all-cotton knitted denim washed style fabric according to claim 1, characterized in that: In the S1, the yarn wax is paraffin or chlorinated paraffin.

6. The method for preparing the all-cotton knitted denim washed style fabric according to claim 1, characterized in that: In S1, the process parameters of stone mill fermentation washing are: Enzyme powder: 1-6g / L, Enzyme water: 1-6g / L, 1-3cm pumice stone: 1-10kg, Bath ratio: 3-10, Temperature: 50℃, Time: 45±5min.

7. The method for preparing the all-cotton knitted denim washed style fabric according to claim 1, characterized in that: In S6, reactive dyes are used for cold pad-batch dyeing, and the process parameters of cold pad-batch dyeing are: Machine speed 20~60m / min, Reactive dye solution: 5~100g / L, Sodium silicate alkali solution: 10-50g / L, Left, middle and right PADDER pressure: 2bar, 3bar, 2bar.

8. The method for preparing the all-cotton knitted denim washed style fabric according to claim 1, characterized in that: In S6, the fabric after padding with dye liquor is piled in a constant temperature room at 20-30° C. for 12-24 hours, and then washed with a rope washing machine at 60-98° C. using 2-10 g / L of soaping agent to remove floating color on the surface.

9. The method for preparing the all-cotton knitted denim washed style fabric according to claim 1, characterized in that: In S5, the temperature is set at 125° C. to 175° C. and the machine speed is set at 15 to 35 m / min to dry the cloth.

10. A pure cotton knitted denim washed style fabric, characterized in that: The fabric is obtained by the preparation method of the all-cotton knitted denim washed style fabric described in any one of claims 1 to 9.

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