CN117026617A - Pretreatment method for improving whiteness of elastic core-spun yarn of pure cotton - Google Patents
Pretreatment method for improving whiteness of elastic core-spun yarn of pure cotton Download PDFInfo
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- CN117026617A CN117026617A CN202310977100.9A CN202310977100A CN117026617A CN 117026617 A CN117026617 A CN 117026617A CN 202310977100 A CN202310977100 A CN 202310977100A CN 117026617 A CN117026617 A CN 117026617A
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- 229920000742 Cotton Polymers 0.000 title claims abstract description 52
- 238000002203 pretreatment Methods 0.000 title claims abstract description 20
- 102000004190 Enzymes Human genes 0.000 claims abstract description 45
- 108090000790 Enzymes Proteins 0.000 claims abstract description 45
- 239000007788 liquid Substances 0.000 claims abstract description 38
- 238000005406 washing Methods 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 22
- 239000002131 composite material Substances 0.000 claims abstract description 19
- 238000007670 refining Methods 0.000 claims abstract description 16
- 238000001035 drying Methods 0.000 claims abstract description 14
- 238000007599 discharging Methods 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 239000007800 oxidant agent Substances 0.000 claims abstract description 7
- 150000001875 compounds Chemical class 0.000 claims abstract description 6
- 230000001590 oxidative effect Effects 0.000 claims abstract description 5
- 229920002334 Spandex Polymers 0.000 claims description 11
- 239000004759 spandex Substances 0.000 claims description 11
- 239000002738 chelating agent Substances 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 239000004094 surface-active agent Substances 0.000 claims description 4
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 2
- 150000002191 fatty alcohols Chemical class 0.000 claims description 2
- 150000002484 inorganic compounds Chemical class 0.000 claims description 2
- 229910010272 inorganic material Inorganic materials 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 claims description 2
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- BCMWYYCCTCFRMH-UHFFFAOYSA-M sodium;4-dodecoxy-4-oxobutanoate Chemical compound [Na+].CCCCCCCCCCCCOC(=O)CCC([O-])=O BCMWYYCCTCFRMH-UHFFFAOYSA-M 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 26
- 238000004043 dyeing Methods 0.000 abstract description 7
- 239000004753 textile Substances 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000002087 whitening effect Effects 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 18
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 15
- 239000004814 polyurethane Substances 0.000 description 11
- 229920002635 polyurethane Polymers 0.000 description 11
- 239000008367 deionised water Substances 0.000 description 8
- 229910021641 deionized water Inorganic materials 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 5
- 235000011121 sodium hydroxide Nutrition 0.000 description 5
- 239000004744 fabric Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000012847 fine chemical Substances 0.000 description 3
- 238000009990 desizing Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000004382 Amylase Substances 0.000 description 1
- 102000013142 Amylases Human genes 0.000 description 1
- 108010065511 Amylases Proteins 0.000 description 1
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- 241001611138 Isma Species 0.000 description 1
- XHCYBIGJUPTJRR-UHFFFAOYSA-N OC(=O)CC(C(O)=O)S(O)(=O)=O.CCCCCCCCCCCC[Na] Chemical compound OC(=O)CC(C(O)=O)S(O)(=O)=O.CCCCCCCCCCCC[Na] XHCYBIGJUPTJRR-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 235000019418 amylase Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 239000004627 regenerated cellulose Substances 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
- D06L4/00—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
- D06L4/40—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using enzymes
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
- D06L4/00—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
- D06L4/10—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen
- D06L4/12—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen combined with specific additives
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
Abstract
The invention belongs to the technical field of textile dyeing and finishing, and particularly relates to a pretreatment method for improving whiteness of pure cotton elastic core-spun yarns. The pretreatment method for improving the whiteness of the elastic core-spun yarn of the pure cotton comprises the following steps: placing the elastic core-spun yarn of pure cotton into a dye vat, injecting a compound biological enzyme solution, performing pretreatment, discharging liquid after the pretreatment, washing with water, and drying; wherein, the composition of the composite biological enzyme liquid is as follows: penetrant, refining agent, oxidant, biological enzyme liquid and water. The method has the advantages of simple process, energy conservation and environmental protection, and the pure cotton elastic core-spun yarn treated by the method has high whiteness and small strong damage, and can provide better basic conditions for the subsequent dyeing, whitening and other processing of the yarn.
Description
Technical Field
The invention belongs to the technical field of textile dyeing and finishing, and particularly relates to a pretreatment method for improving whiteness of pure cotton elastic core-spun yarns.
Background
The biological enzyme is organic matter with catalysis produced by living cells, most of the biological enzyme is protein, and the biological enzyme is very little RNA, so that the biological enzyme is a non-toxic, mild-acting and environment-friendly biological catalyst, and can obviously reduce the activation energy of chemical reaction. The research on biological enzymes is carried out at home and abroad, the biological enzymes are rapidly developed in recent years, and the application field is continuously expanded. The biological enzyme has great superiority in dyeing and finishing industry, not only meets the requirements of green and environment-friendly technology, but also has little damage to fabrics, can improve and enhance the clothing performance of textiles, omits the processes of neutralizing and discharging waste water in the traditional technology, saves water, energy and cost, and is applied to various fields of textile dyeing and finishing. However, in actual production, the color of the yarn turns yellow after the yarn is steamed and shaped compared with Ma Mianbao spandex elastic yarn, the whiteness of the yarn treated by the conventional pretreatment process is still lower, and a new pretreatment process is needed to improve the whiteness of the elastic yarn after pretreatment.
Chinese patent CN109706723a discloses a method for pre-treating regenerated cellulose fiber with biological enzyme, which uses enzyme liquid containing alkaline pectase and amylase to treat the sizing agent on the fabric in ultrasonic environment, to achieve the aim of pre-treating and desizing the fabric, but the method is a fabric desizing process, and does not involve the pre-treatment of yarn.
Chinese patent CN108486859B discloses a dyeing method of pure cotton yarn with lasting whiteness, which uses bleaching auxiliary and its matching process to whiten the yarn, and has great effect on improving whiteness of the yarn, but the auxiliary used in the method is caustic soda, whitening agent, refining agent, etc., which is not environment-friendly.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a pretreatment method for improving the whiteness of the elastic core-spun yarn of the pure cotton, which has the advantages of simple process, energy conservation and environmental protection, and the elastic core-spun yarn of the pure cotton treated by the method has high whiteness and small strong damage.
The technical scheme adopted by the invention is as follows:
the pretreatment method for improving the whiteness of the elastic core-spun yarn of the pure cotton comprises the following steps: placing the elastic core-spun yarn of pure cotton into a dye vat, injecting a compound biological enzyme solution, performing pretreatment, discharging liquid after the pretreatment, washing with water, and drying; wherein, the composition of the composite biological enzyme liquid is as follows: penetrant, refining agent, oxidant, biological enzyme liquid and water.
The pure cotton elastic core spun yarn is yarn after yarn steaming, and the yarn is kept dry before pretreatment; the sheath of the pure cotton elastic core spun yarn is 100% than the horse cotton, and the core yarn is spandex.
The pure cotton elastic core-spun yarn is a cone yarn, the cone yarn is a regular cylinder, the weight is 0.95-1.05kg, and the density is 0.35-0.4g/cm 3 。
The pH value of the composite biological enzyme solution is 10.5-12.5.
The penetrating agent is a compound of various fatty alcohols and surfactants, preferably RAYCLEAN SA-PENII, purchased from the company of Bo Lu Rui fine chemical engineering Co., ltd; the refining agent is polyethylene oxide sulfosuccinic acid lauryl sodium complex, preferably RAYCLEAN SA-E, purchased from the company of Bobo Lu Rui fine chemical engineering Co., ltd; the chelating agent is a phosphate derivative, preferably RAYTEXIL SQ-B, purchased from Zibo Lu Rui Fine chemical Co., ltd; the oxidant is a strong oxidation type inorganic compound, preferably hydrogen peroxide; the biological enzyme solution is a multifunctional biological enzyme solution formed by mixing a plurality of inorganic salts and a surfactant, and preferably the biological enzyme solution is RAYCLEAN SA-ALK I, which is purchased from the company of Zibo Lu Rui fine chemical engineering Co.
The dosage of the penetrating agent is 1-3g/L, the dosage of the refining agent is 2-4g/L, the dosage of the oxidant is 3-5g/L, and the dosage of the biological enzyme solution is 8-10g/L.
The bath ratio of the pure cotton elastic core-spun yarn to the composite biological enzyme liquid is 1 (10-15).
The pretreatment temperature is 98-110 ℃ and the pretreatment time is 40-50min.
The water washing temperature is 50-80 ℃, the time is 10-20min, and the bath ratio is 1 (10-15).
The drying temperature is 100-105 ℃ and the drying time is 20-25min.
Compared with the prior art, the invention has the following beneficial effects:
the pretreatment method for improving the whiteness of the elastic core-spun yarn of the pure cotton has the advantages of simple process, obvious effect, green and mild effect and environmental friendliness; the whiteness of the pure cotton elastic core-spun yarn treated by the pretreatment method for improving the whiteness of the pure cotton elastic core-spun yarn is more than 70, and the strong damage is small.
Detailed Description
The invention is further illustrated below with reference to examples, which are not intended to limit the practice of the invention.
The raw materials used in the examples and comparative examples are as follows:
the other raw materials are conventional commercial products without special description.
Example 1
The elastic core-spun yarn of pure cotton is a polyurethane yarn with the ratio of Ma Mianbao, yarn count of 80/2, 40D peak spandex core-spun, the weight of 1.0 kg/piece and the density of 0.37g/cm 3 The method comprises the following specific steps:
the composition and the dosage of the composite biological enzyme liquid are as follows: biological enzyme solution RAYCLEAN SA-ALK I: 8.0g/L penetrant RAYCLEAN SA-PEN II: 1.0g/L, hydrogen peroxide: 3.0g/L refining agent RAYCLEAN SA-E:2.0g/L, the balance of deionized water, and the pH of the composite biological enzyme solution is 10.51;
placing the pure cotton elastic core-spun yarn to be treated into a dye vat, and injecting a composite biological enzyme solution, wherein the bath ratio is 1:10; heating to 98 ℃, preserving heat for 50min, and discharging liquid; injecting water into the dye vat for washing, wherein the washing temperature is 50 ℃, the time is 20min, the bath ratio is 1:10, and after the washing is finished, the yarn is put into drying equipment and dried for 25 minutes at 100 ℃, so that the pretreatment is completed.
The whiteness value of the tested yarn after the pretreatment is 70.95 and the chromatic value is-0.01.
Example 2
The elastic core-spun yarn of pure cotton is a polyurethane yarn with the ratio of Ma Mianbao, yarn count of 80/2, 40D peak spandex core-spun, the weight of 1.0 kg/piece and the density of 0.37g/cm 3 The method comprises the following specific steps:
the composition and the dosage of the composite biological enzyme liquid are as follows: biological enzyme solution RAYCLEAN SA-ALK I: 10.0g/L penetrant RAYCLEAN SA-PEN II: 3.0g/L, hydrogen peroxide: 5.0g/L refining agent RAYCLEAN SA-E:4.0g/L, the balance of deionized water, wherein the pH value of the composite biological enzyme solution is 12.50;
placing the pure cotton elastic core-spun yarn to be treated into a dye vat, and injecting a composite biological enzyme solution, wherein the bath ratio is 1:15; heating to 110 ℃, preserving heat for 40min, and discharging liquid; injecting water into the dye vat for washing, wherein the washing temperature is 50 ℃, the time is 20min, the bath ratio is 1:10, and after the washing is finished, the yarns are put into drying equipment and dried for 20min at 105 ℃ to finish pretreatment.
The whiteness value of the tested yarn after the pretreatment is 73.0 and the chromatic value is 0.26.
Example 3
The pure cotton yarn is a polyurethane yarn with the ratio of Ma Mianbao, the yarn count is 100/2, the core-spun 40D Huafeng polyurethane is 1.05 kg/piece, and the density is 0.40g/cm 3 The method comprises the following specific steps:
the composition and the dosage of the composite biological enzyme liquid are as follows: biological enzyme solution RAYCLEAN SA-ALK I: 10.0g/L penetrant RAYCLEAN SA-PEN II: 3.0g/L, hydrogen peroxide: 5.0g/L refining agent RAYCLEAN SA-E:4.0g/L, the balance of deionized water, wherein the pH of the composite biological enzyme solution is 12.44;
placing the pure cotton elastic core-spun yarn to be treated into a dye vat, and injecting a composite biological enzyme solution, wherein the bath ratio is 1:10; heating to 110 ℃, preserving heat for 40min, and discharging liquid; injecting water into the dye vat for washing, wherein the washing temperature is 80 ℃, the time is 10min, the bath ratio is 1:15, and after the washing is finished, the yarn is put into drying equipment and dried for 25 minutes at 100 ℃, so that the pretreatment is completed.
The whiteness value of the tested yarn after the pretreatment is 70.5 and the chromatic value is 0.17.
Example 4
The pure cotton yarn is a polyurethane yarn with the ratio of Ma Mianbao, the yarn count is 100/2, the core-spun 40D Huafeng polyurethane is 1.05 kg/piece, and the density is 0.40g/cm 3 The method comprises the following specific steps:
the composition and the dosage of the composite biological enzyme liquid are as follows: biological enzyme solution RAYCLEAN SA-ALK I: 8g/L penetrant RAYCLEAN SA-PEN II: 1.0g/L, hydrogen peroxide: 3.0g/L refining agent RAYCLEAN SA-E:2.0g/L, the balance of deionized water, and the pH of the composite biological enzyme solution is 10.55;
placing the pure cotton elastic core-spun yarn to be treated into a dye vat, and injecting a composite biological enzyme solution, wherein the bath ratio is 1:15; heating to 98 ℃, preserving heat for 50min, and discharging liquid; injecting water into the dye vat for washing, wherein the washing temperature is 80 ℃, the time is 10min, the bath ratio is 1:15, and after the washing is finished, the yarns are put into drying equipment and dried for 20 minutes at 105 ℃ to finish pretreatment.
The yarn was tested for whiteness value 71.59 after pretreatment was complete and for a color value of 0.08.
Comparative example 1
The elastic core-spun yarn of pure cotton is a polyurethane yarn with the ratio of Ma Mianbao, yarn count of 80/2, 40D peak spandex core-spun, the weight of 1.0 kg/piece and the density of 0.37g/cm 3 The method comprises the following specific steps:
the pretreatment liquid comprises the following components in percentage by weight: caustic soda: 3.0g/L, hydrogen peroxide: 8.0g/L refining agent RAYCLEAN SA-E:2.0g/L of chelating agent RAYTEXIL SQ-B:0.5g/L, the balance deionized water, and the pH of the pretreatment liquid is 10.53;
placing the pure cotton elastic core-spun yarn to be treated into a dye vat, and injecting pretreatment liquid, wherein the bath ratio is 1:10; heating to 98 ℃, preserving heat for 50min, and discharging liquid; injecting water into the dye vat for washing, wherein the washing temperature is 50 ℃, the time is 20min, the bath ratio is 1:10, and after the washing is finished, the yarn is put into drying equipment and dried for 25 minutes at 100 ℃, so that the pretreatment is completed.
After the pretreatment is finished, the whiteness value of the tested yarn is 59.27, and the chromatic value is-0.03.
Comparative example 2
The elastic core-spun yarn of pure cotton is a polyurethane yarn with the ratio of Ma Mianbao, yarn count of 80/2, 40D peak spandex core-spun, the weight of 1.0 kg/piece and the density of 0.37g/cm 3 The method comprises the following specific steps:
the pretreatment liquid comprises the following components in percentage by weight: caustic soda: 5.0g/L, hydrogen peroxide: 10.0g/L refining agent RAYCLEAN SA-E:3.0g/L chelating agent RAYTEXIL SQ-B:0.5g/L, the balance deionized water, and the pH of the pretreatment liquid is 12.46;
placing the pure cotton elastic core-spun yarn to be treated into a dye vat, and injecting pretreatment liquid, wherein the bath ratio is 1:15; heating to 110 ℃, preserving heat for 40min, and discharging liquid; injecting water into the dye vat for washing, wherein the washing temperature is 50 ℃, the time is 20min, the bath ratio is 1:10, and after the washing is finished, the yarns are put into drying equipment and dried for 20min at 105 ℃ to finish pretreatment.
The whiteness value of the tested yarn after the pretreatment is 56.85 and the chromatic value is-0.42.
Comparative example 3
The elastic core-spun yarn of pure cotton is a polyurethane yarn with the ratio of Ma Mianbao, the yarn count is 100/2, the core-spun 40D Huafeng polyurethane is 1.0 kg/piece, and the density is 0.37g/cm 3 The method comprises the following specific steps:
the pretreatment liquid comprises the following components in percentage by weight: caustic soda: 5.0g/L, hydrogen peroxide: 10.0g/L refining agent RAYCLEAN SA-E:3.0g/L chelating agent RAYTEXIL SQ-B:0.5g/L, the balance deionized water, and the pH of the pretreatment liquid is 12.32;
placing the pure cotton elastic core-spun yarn to be treated into a dye vat, and injecting pretreatment liquid, wherein the bath ratio is 1:10; heating to 110 ℃, preserving heat for 40min, and discharging liquid; injecting water into the dye vat for washing, wherein the washing temperature is 80 ℃, the time is 10min, the bath ratio is 1:15, and after the washing is finished, the yarn is put into drying equipment and dried for 25 minutes at 100 ℃, so that the pretreatment is completed.
The whiteness value of the tested yarn after the pretreatment is 58.24 and the chromatic value is 0.01.
Comparative example 4
The ratio of pure cotton yarns isMa Mianbao polyurethane yarn, yarn count 100/2, core-spun 40D spandex, weight 1.05 kg/piece, density 0.40g/cm 3 The method comprises the following specific steps:
the pretreatment liquid comprises the following components in percentage by weight: caustic soda: 3.0g/L, hydrogen peroxide: 8.0g/L refining agent RAYCLEAN SA-E:3.0g/L chelating agent RAYTEXIL SQ-B:0.5g/L, the balance deionized water, and the pH of the pretreatment liquid is 10.51;
placing the pure cotton elastic core-spun yarn to be treated into a dye vat, and injecting pretreatment liquid, wherein the bath ratio is 1:15; heating to 98 ℃, preserving heat for 50min, and discharging liquid; injecting water into the dye vat for washing, wherein the washing temperature is 80 ℃, the time is 10min, the bath ratio is 1:15, and after the washing is finished, the yarns are put into drying equipment and dried for 20 minutes at 105 ℃ to finish pretreatment.
The whiteness value of the tested yarn after the pretreatment is 59.39 and the chromatic value is-0.28.
The specific test results are shown in the following table:
table 1 comparison of properties of yarns
As can be seen from the data in Table 1, under the condition of similar feed liquid pH, the whiteness of the Ma Mianbao spandex elastic yarn treated by the novel process is about 10-16 higher than that of the spandex elastic yarn treated by the conventional process, the chromatic light deviation is smaller, the whiteness of the spandex elastic core-spun yarn after pretreatment can be effectively improved by the novel process, and better basic conditions can be provided for subsequent dyeing or whitening treatment of the yarn.
Claims (10)
1. A pretreatment method for improving whiteness of pure cotton elastic core-spun yarn is characterized by comprising the following steps: placing the elastic core-spun yarn of pure cotton into a dye vat, injecting a compound biological enzyme solution, performing pretreatment, discharging liquid after the pretreatment, washing with water, and drying; wherein, the composition of the composite biological enzyme liquid is as follows: penetrant, refining agent, oxidant, biological enzyme liquid and water.
2. The pretreatment method for improving whiteness of the elastic pure cotton core-spun yarn according to claim 1, wherein the elastic pure cotton core-spun yarn is a steamed yarn, and the yarn is kept dry before pretreatment; the sheath of the pure cotton elastic core spun yarn is 100% than the horse cotton, and the core yarn is spandex.
3. The pretreatment method for improving whiteness of elastic pure cotton core-spun yarn according to claim 1, wherein the elastic pure cotton core-spun yarn is a cone yarn, the cone yarn is a regular cylinder, and has a weight of 0.95-1.05kg and a density of 0.35-0.4g/cm 3 。
4. The pretreatment method for improving whiteness of the elastic core-spun yarn of pure cotton according to claim 1, wherein the pH value of the composite biological enzyme solution is 10.5-12.5.
5. The pretreatment method for improving the whiteness of the elastic core-spun yarn of the pure cotton according to claim 1, wherein the penetrating agent is a compound of a plurality of fatty alcohols and a surfactant, the refining agent is a compound of polyethylene oxide sodium lauryl succinate, the oxidizing agent is a strong-oxidation inorganic compound, the chelating agent is a phosphate derivative, and the biological enzyme liquid is a multifunctional biological enzyme liquid formed by mixing a plurality of inorganic salts and a surfactant.
6. The pretreatment method for improving the whiteness of the elastic core-spun yarn of the pure cotton according to claim 1, wherein the dosage of the penetrating agent is 1-3g/L, the dosage of the refining agent is 2-4g/L, the dosage of the oxidizing agent is 3-5g/L, and the dosage of the biological enzyme solution is 8-10g/L.
7. The pretreatment method for improving whiteness of the elastic pure cotton core-spun yarn according to claim 1, wherein the bath ratio of the elastic pure cotton core-spun yarn to the composite biological enzyme solution is 1 (10-15).
8. The pretreatment method for improving the whiteness of the elastic core-spun yarn of the pure cotton according to claim 1, wherein the pretreatment temperature is 98-110 ℃ and the pretreatment time is 40-50min.
9. The pretreatment method for improving the whiteness of the elastic core-spun yarn of the pure cotton according to claim 1, wherein the washing temperature is 50-80 ℃, the washing time is 10-20min, and the bath ratio is 1 (10-15).
10. The pretreatment method for improving the whiteness of the elastic core-spun yarn of the pure cotton according to claim 1, wherein the drying temperature is 100-105 ℃ and the time is 20-25min.
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