CN-122013394-A - Preparation method of composite structure electromagnetic shielding yarn containing regenerated cotton fibers and yarn

CN122013394ACN 122013394 ACN122013394 ACN 122013394ACN-122013394-A

Abstract

A method for preparing electromagnetic shielding yarn with a composite structure containing regenerated cotton fibers comprises the following steps of S1, spinning stainless steel filaments and fine cotton roves by a ring spinning process to enable the fine cotton fibers to be coated on the peripheries of the stainless steel filaments to obtain primary wrapping yarns, S2, spinning the primary wrapping yarns and regenerated cotton slivers by a friction spinning process to enable the regenerated cotton fibers to be coated on the peripheries of the primary wrapping yarns to obtain wrapping yarns, and S3, spinning the wrapping yarns and the fine cotton roves by the ring spinning process to enable the fine cotton fibers to be coated on the peripheries of the wrapping yarns to obtain the yarn. The design constructs the multi-layer composite structure yarn through the three-step combination process, so that the regenerated cotton fibers which are difficult to apply due to short fibers and poor cohesion can form tight cladding on smooth stainless steel filaments, the problem of core leakage is solved, and meanwhile, the friction spinning process improves the mass ratio of the regenerated cotton fibers in the yarn to more than 30%, so that the utilization efficiency of regenerated cotton resources is greatly improved.

Inventors

CHEN YIREN
LI FEI
LUO MING
GAO XIANGYU
LI XIAOYAN
LI YIMING
CAO XINWANG

Assignees

武汉纺织大学

Dates

Publication Date: 20260512
Application Date: 20260319

Claims (10)

1. The preparation method of the composite structure electromagnetic shielding yarn containing the regenerated cotton fibers is characterized by comprising the following steps of: S1, spinning stainless steel filaments and fine cotton roving by adopting a ring spinning process, so that fine cotton fibers formed by drawing the fine cotton roving are coated on the peripheries of the stainless steel filaments to prepare primary wrapping yarns; S2, spinning the primary wrap yarn and the regenerated cotton sliver by adopting a friction spinning process, so that regenerated cotton fibers formed by carding the regenerated cotton sliver are coated on the periphery of the primary wrap yarn, and a coated yarn is prepared; s3, spinning the covered yarn and the fine cotton roving by adopting a ring spinning process, so that fine cotton fibers formed by drafting the fine cotton roving are covered on the periphery of the covered yarn, and the electromagnetic shielding yarn with the composite structure containing the regenerated cotton fibers is prepared.
2. The method for preparing the electromagnetic shielding yarn with the composite structure containing the regenerated cotton fibers, which is disclosed in claim 1, is characterized in that in the step S1, the linear density of the fine cotton roving is 600-650 tex, the linear density of the stainless steel filament is 3-5 tex, the ring spinning process is Sirofil spinning, the process parameters are that the spindle speed is 5800r/min-6200r/min, the twist coefficient is 340-380, and the back zone draft multiple is 1.4-1.6.
3. The method for producing an electromagnetic shielding yarn of a composite structure containing regenerated cotton fibers according to claim 2, wherein in the step S1, the yarn density of the primary spun yarn is 14tex to 16tex, wherein the mass ratio of the stainless steel filaments is 25% to 30%, and the mass ratio of the fine cotton fibers is 70% to 75%.
4. The method for preparing the composite structure electromagnetic shielding yarn containing the regenerated cotton fibers according to claim 1, 2 or 3, wherein in the step S2, the preparation method of the regenerated cotton sliver comprises the following steps of firstly putting a regenerated cotton raw material into an opener, removing impurities to obtain a regenerated cotton fiber layer, then feeding the regenerated cotton fiber layer into a carding machine, carding to form a regenerated cotton fiber web, and finally drawing the regenerated cotton fiber web by a drawing frame to obtain the regenerated cotton sliver.
5. The method for preparing the electromagnetic shielding yarn with the regenerated cotton fiber composite structure according to claim 4, wherein in the opening and impurity removing step, the cylinder speed of an opener is 400 r/min-430 r/min, the doffer speed is 200r/min-215r/min, the feeding line speed is 0.70 m/min-0.75 m/min, in the carding step, the cylinder speed of a carding machine is 380 r/min-420 r/min, the doffer speed is 180 r/min-200 r/min, the feeding line speed is 0.09m/min-0.11m/min, in the drawing step, 3-5 raw sliver is combined, the draft multiple is 3.5-4.5 times, two-4 sliver is combined, and the draft multiple is 2.5-3.5 times, and the prepared regenerated cotton sliver density is 300tex-400tex.
6. The method for preparing the electromagnetic shielding yarn with the composite structure containing the regenerated cotton fibers according to claim 1,2 or 3, wherein in the step S2, the process parameters of friction spinning are that the rotating speed of a friction roller is 2700r/min-5100r/min and the rotating speed of a carding roller is 2500r/min-4000r/min.
7. The method for producing an electromagnetic shielding yarn of composite structure containing regenerated cotton fiber according to claim 1, 2 or 3, wherein in the step S2, the linear density of the produced covered yarn is 28tex-32tex, wherein the mass ratio of the stainless steel filaments is 12% -14%, the mass ratio of the fine cotton fiber is 35% -37%, and the mass ratio of the regenerated cotton fiber is 49% -51%.
8. The method for preparing the electromagnetic shielding yarn with the composite structure containing the regenerated cotton fibers according to claim 1,2 or 3, wherein in the step S3, the technological parameters of ring spinning are that the spindle speed is 6800 r/min-7200r/min, the twist coefficient is 350-370, and the back zone draft multiple is 1.1-1.3.
9. The method of claim 4, wherein in the step S3, the linear density of the composite electromagnetic shielding yarn is 44tex-46tex, the mass ratio of the stainless steel filaments is 8.5-9.5%, the mass ratio of the fine cotton fibers is 57.5-58.5%, and the mass ratio of the regenerated cotton fibers is 32-34%.
10. The yarn is characterized in that the yarn is prepared by the preparation method of the composite structure electromagnetic shielding yarn containing the regenerated cotton fibers, which is disclosed in the claims 1, 2 or 3, and the yarn is provided with a three-layer cladding composite structure which sequentially comprises a stainless steel filament core wire, a fine cotton inner layer cladding layer, a regenerated cotton middle layer cladding layer and a fine cotton outer cladding layer from inside to outside.

Description

Preparation method of composite structure electromagnetic shielding yarn containing regenerated cotton fibers and yarn Technical Field The invention relates to a preparation method of a composite structure yarn and the yarn, belongs to the technical field of functional textile materials, and particularly relates to a preparation method of a composite structure electromagnetic shielding yarn containing regenerated cotton fibers and the yarn. Background With the rapid development of electronic devices and wireless communication technologies, the potential effects of electromagnetic radiation on the environment and human health are increasingly focused, and the need for electromagnetic protection is also becoming urgent. To reduce electromagnetic interference and achieve electromagnetic shielding, conductive fibers and metallic materials are increasingly being used in the textile field for the manufacture of electromagnetic shielding fabrics. The method is characterized in that metal filaments such as stainless steel wires and copper wires are used as core wires, and non-conductive textile fibers such as cotton and polyester are coated to form the core-spun yarn with a soft coating structure, so that the method is one of the important modes for preparing the electromagnetic shielding yarn at present. Meanwhile, with the deep concept of sustainable development, the recycling of waste textiles becomes an important development direction of the textile industry. And the regenerated cotton fiber is used as a main product of recycling waste textiles, and has remarkable environmental benefit and cost advantage. Under the background, the industry tries to blend regenerated cotton fibers and original cotton fibers and then coat stainless steel filaments to prepare yarns with the environment-friendly property and the electromagnetic shielding function. However, in practice, it has been found that the regenerated cotton fiber has inherent defects such as a shortened fiber length, reduced or even no natural surface buckling during the recovery process, resulting in a significantly lower cohesion than the virgin cotton fiber. When the regenerated cotton/fine cotton wool blended yarn is coated on a stainless steel filament with a smooth surface by adopting a traditional core spun yarn process, the structure of the prepared blended yarn is loose even if the content of the regenerated cotton is low due to the poor cohesion of the regenerated cotton fiber, the stainless steel filament is difficult to form tight and uniform coating, and the phenomenon of core leakage of the exposed core yarn is easy to occur, so that the electromagnetic shielding effect is fluctuated and the protective performance is unstable. Therefore, how to overcome the inherent defect of the regenerated cotton fiber, the regenerated cotton/fine cotton blend yarn can form tight and uniform coating on the stainless steel filament, and the phenomenon of core leakage is avoided, and the technical problem to be solved in the field is urgent. The disclosure of this background section is only intended to increase the understanding of the general background of the application and should not be taken as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art. Disclosure of Invention The invention aims to overcome the defect that the regenerated cotton/fine cotton wool blended yarn is difficult to form a tight and uniform package on a stainless steel filament in the prior art, and provides a preparation method of an electromagnetic shielding yarn with a composite structure and regenerated cotton fibers, wherein the composite structure and the electromagnetic shielding yarn enable the regenerated cotton/fine cotton wool blended yarn to form a tight and uniform package on the stainless steel filament. In order to achieve the above object, the technical solution of the present invention is: a method for preparing an electromagnetic shielding yarn with a composite structure containing regenerated cotton fibers, which comprises the following steps: S1, spinning stainless steel filaments and fine cotton roving by adopting a ring spinning process, so that fine cotton fibers formed by drawing the fine cotton roving are coated on the peripheries of the stainless steel filaments to prepare primary wrapping yarns; S2, spinning the primary wrap yarn and the regenerated cotton sliver by adopting a friction spinning process, so that regenerated cotton fibers formed by carding the regenerated cotton sliver are coated on the periphery of the primary wrap yarn, and a coated yarn is prepared; s3, spinning the covered yarn and the fine cotton roving by adopting a ring spinning process, so that fine cotton fibers formed by drafting the fine cotton roving are covered on the periphery of the covered yarn, and the electromagnetic shielding yarn with the composite structure containing the regenerated co