Composite coated yarn and production method thereof

Abstract

The invention belongs to the technical field of medical supplies, and particularly discloses a composite coated yarn and a production method thereof.The composite coated yarn comprises a spandex yarn core and a coating layer, the coating layer comprises first chemical fiber yarn and second chemical fiber yarn, the first chemical fiber yarn and the second chemical fiber yarn are twisted and stranded and then spirally wound outside the spandex yarn core, and the first chemical fiber yarn and the second chemical fiber yarn are wound outside the spandex yarn core. The overall strength and wear resistance of the yarn are enhanced; after stranding, wrapping and heat setting, two times of circulation treatment of one-time heat setting are achieved, saturated steam permeates into the wrap yarn, internal and external permeation of the wrap yarn is balanced, accordingly, internal and external tension and elasticity are uniform and consistent, efficiency is high, higher flexibility and customization level of products are achieved on the aspects of size and pressure grade, and the production cost is reduced. And personalized requirements of more patients can be met.

Description

Technical Field

[0001] The invention belongs to the technical field of medical supplies, and in particular relates to a composite coated yarn and a production method thereof. Background Art

[0002] The existing covering method of the covered yarn includes a yarn core, an outer covering yarn spirally wound on the yarn core; the outer covering yarn includes a first layer of outer covering yarn and a second layer of outer covering yarn; the first layer of outer covering yarn includes a first outer covering yarn and a second outer covering yarn, and the second layer of covering yarn includes a third outer covering yarn and a fourth outer covering yarn; the first outer covering yarn and the second outer covering yarn are spirally wound on the yarn core in opposite directions side by side, and the third outer covering yarn and the fourth outer covering yarn are spirally wound on the first layer of outer covering yarn in opposite directions side by side, and the yarn core is made of spandex, and the draft multiple of the spandex in the yarn core is 4. Four outer covering yarns are added to the outside of the yarn core, and the draft multiple of the spandex yarn is 4; at the same time, four outer covering yarns are reasonably arranged on its outer layer to ensure the maximum tensile force of the covering yarn while ensuring the strength of the covering yarn, but the pressure of making medical varicose vein socks is too large and can only provide fixed pressure, and the product weight is heavy. Summary of the invention

[0003] In view of the problems in the prior art, a composite coated yarn and a production method thereof are proposed. The present invention provides the following technical solutions:

[0004] A composite coated yarn comprises a spandex core and a coating layer, wherein the coating layer comprises a first chemical fiber and a second chemical fiber, and the first chemical fiber and the second chemical fiber are twisted and ply-ply-wound helically outside the spandex core.

[0005] Preferably, the coating layer consists of a first chemical fiber filament and a second chemical fiber filament.

[0006] Preferably, the first chemical fiber yarn is artificial chemical fiber filament, and the second chemical fiber yarn is natural fiber.

[0007] Preferably, the spandex core wires include more than two spandex core wires, and each spandex core wire is arranged in parallel.

[0008] A method for producing a composite coated yarn comprises the following steps:

[0009] S1. Joint stock;

[0010] The first chemical fiber yarn and the second chemical fiber yarn are combined and weakly twisted on a drafting and twisting machine;

[0011] S2, coating;

[0012] The first chemical fiber yarn and the second chemical fiber yarn after twisting are coated on the spandex yarn core clockwise or counterclockwise to form a coating layer;

[0013] S3, heat setting;

[0014] The product obtained in step S2 is placed in a vacuum preshrinking tank, and the air pressure in the tank is reduced to 110-115 mmHg. Then, the tank is heated to 50-60°C, and kept at this temperature for 10-20 minutes to allow the steam to penetrate into the coated yarn. Then, the pressure in the tank is increased to 140-145 mmHg, and the temperature is increased to 65-75°C. It is kept at this temperature for 30-40 minutes for preshrinking and heat setting.

[0015] Preferably, in step S2, the spandex core yarn is curled on two paper tubes respectively, coaxially placed on a conveying roller, and pulled to form a spandex yarn core.

[0016] Preferably, the axial length of the paper tube is 50-57 mm, two special spandex core yarns are introduced into the spindle and output at a linear speed of 1000-1100 rpm, and the spandex output drafting roller wraps the first and second synthetic fiber yarns after twisting onto the spandex yarn core clockwise at a multiple of 3.6-3.8.

[0017] Preferably, the first chemical fiber yarn and the second chemical fiber yarn are artificial fiber and natural fiber respectively, and the twist degree is 400-450 twists / meter.

[0018] Preferably, the count of a single spandex core yarn is 1 / 2 of the count of a preset spandex core yarn, which is a multiple of 3.7.

[0019] Preferably, in step S3, after the air pressure in the tank drops to 110 mmHg, heating is started in the tank, and after the steam penetrates into the interior of the coated yarn, the pressure in the tank is raised to 140 mmHg.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. By using a combination of artificial chemical fiber filaments and natural fibers, as well as multiple parallel spandex core fibers, the strength, abrasion resistance, resilience and uniformity of the yarn are significantly improved, while giving the yarn better moisture absorption, breathability and natural touch;

[0022] 2. By optimizing the heat setting process, two cycles of heat setting are achieved, so that saturated steam can fully penetrate into the inside of the covered yarn to achieve internal and external permeation balance, thereby greatly shortening the balance time and improving production efficiency;

[0023] 3. In the production process of medical varicose vein socks, this solution can not only reduce the weight of the product while ensuring the strength by optimizing the yarn structure and material combination, but also flexibly change the product size by adjusting the stepper motor value in the programming system to achieve different pressure requirements. The new coated yarn of the present invention can meet the needs of patients with more size requirements, thereby improving the customization and personalization level of the product. DETAILED DESCRIPTION

[0025] A composite coated yarn comprises a spandex core and a coating layer, wherein the coating layer comprises a first chemical fiber filament and a second chemical fiber filament, and the first chemical fiber filament and the second chemical fiber filament are twisted and plied and spirally wound around the spandex core, thereby enhancing the overall strength and wear resistance of the yarn, and also improving the comfort and feel of the yarn through a specific fiber combination.

[0026] Furthermore, the coating layer is composed of a first chemical fiber yarn and a second chemical fiber yarn; the first chemical fiber yarn is made of artificial chemical fiber filament, and the second chemical fiber yarn is made of natural fiber, which enhances the elasticity of the spandex composite coated yarn, optimizes the elastic properties of the yarn, and also gives the yarn better moisture absorption, breathability and natural touch.

[0027] Furthermore, the spandex core includes more than two spandex cores, and each spandex core is arranged in parallel, which improves elasticity while ensuring uniformity.

[0028] A method for producing a composite coated yarn comprises the following steps:

[0029] S1. Joint stock;

[0030] The first chemical fiber yarn and the second chemical fiber yarn are combined and weakly twisted on a drafting and twisting machine; the first chemical fiber yarn and the second chemical fiber yarn are respectively made of artificial fiber and natural fiber, and the twist degree is 400-450 twists / meter.

[0031] S2, coating;

[0032] The spandex core yarn is curled on two paper tubes respectively. The axial length specification of the paper tube is 57mm. It is placed on the conveying roller and arranged coaxially in parallel. Two spandex core yarns with different counts are introduced into the spindle and output at a linear speed of 1100rpm. The count of a single spandex core yarn is 1 / 2 of the preset count of the spandex core yarn. The spandex output drafting roller wraps the first chemical fiber yarn and the second chemical fiber yarn after twisting onto the spandex core yarn clockwise at a multiple of 3.7 times to form a coating layer; the tightness and uniformity of the coating layer are ensured, and the overall performance of the yarn is improved.

[0033] The paper tube and the spandex core yarn on the paper tube are arranged coaxially and in parallel, so that two spandex core yarns can be paralleled on the existing equipment and coated at the same time, which has high efficiency and low cost. Although the count of a single spandex core yarn is 1 / 2 of the count of the preset spandex core yarn, it can achieve an effect greater than the count of the preset spandex core yarn, thereby improving its elastic strength.

[0034] S3, heat setting;

[0035] The product obtained in step S2 is placed in a vacuum preshrinking tank, the air pressure in the tank is reduced to 110 mmHg, and then the tank is heated to 50-60°C, and kept at this temperature for 10-20 minutes to allow the steam to penetrate into the coated yarn, and then the pressure in the tank is increased to 140 mmHg, the temperature is increased to 65-75°C, and kept at this temperature for 30-40 minutes for preshrinking and heat setting.

[0036] The double cycle treatment of one heat setting is realized, and the saturated steam penetrates into the inside of the coated yarn, so that the inside and outside of the coated yarn are balanced, so that the tension and elasticity inside and outside are uniform, which greatly shortens the balance time and can be completed in just a few hours. After the pre-shrinkage and heat setting are completed, the yarn can be taken out by opening the can.

[0037] In the process of making medical varicose vein socks, the product size can be changed by adjusting the step motorValue (stepper motor value) value in the programming system within the range of 110-140, thereby achieving the effect of changing the pressure. When the tepmotor Value value is adjusted to 110, the product size is 7 cm, and the pressure value is the upper limit of the pressure in the YY / T 0853-2024 pressure level standard, such as 21 mmHg, 32 mmHg, and 46 mmHg; when the tep motor Value value is adjusted to 150, the product size is 9 cm, and the pressure value is the lower limit of the pressure in the YY / T 0853-2024 pressure level standard, such as 15 mmHg, 23 mmHg, and 34 mmHg. By adopting the new coated yarn of the present invention, the required pressure change of any size can be achieved within the size range of 7-9 cm. For different pressure levels, the new coated yarn of the present invention can meet the needs of products of all pressure levels, which is better than YY / T Each pressure level in 0853-2024 requires the selection of a specific specification of covered yarn. In the production process of varicose vein socks, there is only a method of setting a fixed size value to achieve the pressure requirement. It has greater operability and a wider range of applications, and can meet the needs of patients with more size requirements.

[0038] After testing, compared with the products in the prior art:

[0039]

[0040] Note:

[0041] Breaking strength (cN / dtex): measures the ability of a yarn to withstand external forces without breaking.

[0042] Abrasion resistance (number of cycles): simulates the durability of yarn under friction conditions.

[0043] Resilience (%): The ability of yarn to return to its original shape after being subjected to force.

[0044] Dimensional stability (% change): The degree to which a yarn changes dimensions during processing or use.

[0045] Heat setting time (hours): The time required to complete the heat setting process affects production efficiency.

[0046] Adjustable range of pressure levels and applicable size range: The flexibility of the product to meet the pressure and size requirements for specific applications such as medical varicose vein socks.

[0047] It can be seen that the products of this solution have greatly improved key physical properties such as breaking strength, wear resistance and resilience, ensuring higher durability and stability of the products. In addition, by optimizing materials and processes, the air permeability and hygroscopicity of the products have also been significantly improved. In addition, this solution also significantly shortens the heat setting time, improves production efficiency and reduces production costs. The products of this solution have achieved higher flexibility and customization in size and pressure level, which can meet the personalized needs of more patients and improve the market competitiveness and scope of application of the products. In summary, the products of this solution have shown obvious advantages in performance, comfort, production efficiency and market adaptability.

Claims

1. A composite coated yarn, characterized in that: The invention comprises a spandex yarn core and a covering layer, wherein the covering layer comprises a first chemical fiber yarn and a second chemical fiber yarn, and the first chemical fiber yarn and the second chemical fiber yarn are twisted and ply-ply-wound helically outside the spandex yarn core.

2. The composite covered yarn according to claim 1, characterized in that The coating layer consists of first chemical fiber filaments and second chemical fiber filaments.

3. The composite covered yarn according to claim 1 or 2, characterized in that: The first chemical fiber yarn is artificial chemical fiber filament, and the second chemical fiber yarn is natural fiber.

4. The composite covered yarn according to claim 1, characterized in that: The spandex core comprises more than two spandex core yarns, and each spandex core yarn is arranged in parallel.

5. A method for producing a composite coated yarn, characterized in that: The following steps are involved: S1. Joint stock; The first chemical fiber yarn and the second chemical fiber yarn are combined and weakly twisted on a drafting and twisting machine; S2, coating; The first chemical fiber yarn and the second chemical fiber yarn after twisting are coated on the spandex yarn core clockwise or counterclockwise to form a coating layer; S3, heat setting; The product obtained in step S2 is placed in a vacuum preshrinking tank, and the air pressure in the tank is reduced to 110-115 mmHg. Then, the tank is heated to 50-60°C, and kept at this temperature for 10-20 minutes to allow the steam to penetrate into the coated yarn. Then, the pressure in the tank is increased to 140-145 mmHg, and the temperature is increased to 65-75°C. It is kept at this temperature for 30-40 minutes for preshrinking and heat setting.

6. The method for producing a composite coated yarn according to claim 5, characterized in that: In step S2, the spandex core yarns are respectively curled on two paper tubes, coaxially placed on a conveying roller, and pulled to form a spandex yarn core.

7. The method for producing a composite coated yarn according to claim 6, characterized in that: The axial length specification of the paper tube is 50-57mm. Two special spandex cores are introduced into the spindle and output at a linear speed of 1000-1100rpm at the same time. The spandex output drafting roller wraps the first and second chemical fiber filaments after twisting onto the spandex core clockwise at a multiple of 3.6-3.8 times.

8. The method for producing a composite coated yarn according to claim 5 or 7, characterized in that: The first chemical fiber yarn and the second chemical fiber yarn are made of artificial fiber and natural fiber respectively, and the twist degree is 400-450 twists / m.

9. The method for producing a composite coated yarn according to claim 7, characterized in that: The count of a single spandex core yarn is 1 / 2 of the preset spandex core yarn count, and the multiple is 3.

7.

10. The method for producing a composite coated yarn according to claim 5, characterized in that: In step S3, after the air pressure in the tank drops to 110 mmHg, the tank starts to be heated, and after the steam penetrates into the inside of the coated yarn, the pressure in the tank is raised to 140 mmHg.

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