1. A become elasticity electrically conductive yarn which characterized in that: the method comprises the following steps:

s1, spinning the conductive core-spun yarn by using a ring spinning machine, feeding a predetermined amount of fiber roving into a drafting zone for drafting by using the ring spinning machine, and pressing fiber strands obtained after drafting by a front roller; after passing through a first unwinding mechanism and a first godet wheel, the conductive fiber filaments are fed from a front roller mouth and twisted and wrapped with fiber strands to form conductive core-spun yarns; the core yarn of the conductive core-spun yarn is a conductive fiber filament, and the outer cladding layer of the conductive core-spun yarn is fiber roving;

s2, preparing elastic conductive yarn by ring spinning, wherein the conductive covering yarn and the elastic fiber filament respectively pass through a second unwinding mechanism, a second godet wheel, a third unwinding mechanism and a third godet wheel correspondingly, and are simultaneously fed from a second front roller opening, twisted and wrapped to form the elastic conductive yarn. The core yarn of the elastic conductive yarn is elastic fiber filament, and the outer cladding layer of the elastic conductive yarn is conductive covering yarn.

The speed of a godet roller in a second unwinding mechanism through which the conductive core-spun yarn passes is kept unchanged, so that the drafting multiple of the conductive core-spun yarn is unchanged; the speed of a godet roller in a third unwinding mechanism through which the elastic fiber filament passes is periodically changed, so that the drafting multiple of the elastic fiber filament is periodically changed.

2. A variable-elasticity conductive yarn as claimed in claim 1, wherein: the fiber roving is short fiber with poor conductivity and excellent mechanical property, such as terylene and nylon; the conductive fiber filament is a metal filament with excellent conductivity or a plated conductive fiber filament.

3. A variable-elasticity conductive yarn as claimed in claim 1, wherein: the elastic fiber filament drafting multiple changes periodically, and the periodic change rule is as follows:

wherein r is the drafting multiple of the elastic fiber filament, and the period of the yarn length change is L₁+L₂+L₃，L₁、L₂、L₃Respectively, the lengths of different sections in a period, and L is the length position of the yarn in the period.

4. A variable-elasticity conductive yarn as claimed in claim 3, wherein: said L₁Has a length of 1-3 cm, L₂Has a length of 3-5 cm, L₃The length of (a) is 1-3 cm.

5. A variable-elasticity conductive yarn as claimed in claim 1, wherein: the variable-elasticity conductive yarn is formed by wrapping an elastic fiber filament by a conductive covering yarn, the conductive covering yarn is formed by wrapping a conductive fiber filament by a short fiber, the short fiber plays roles of insulation and flexibility increase, and the count range of the conductive covering yarn is 10-60 English.

Technical Field

With the progress of science and technology, intelligent wearable equipment more and more walks into people's daily life. The wearable technology collects, processes and feeds back the human body related information by fusing the technologies of textile, materials, sensors, artificial intelligence, internet and the like, the intelligent wearable product applied to the field of textile and clothing is prepared, specific functions of monitoring human health, information transmission, communication, man-machine interaction and the like are realized, and the functionality, comfort and fashion of the clothing are improved. Wearable technology has become a research hotspot in the fields of commerce, medicine, military, aerospace and the like. Especially has wide application prospect in the directions of wearable sensing gloves, wearable sports goods, special wearable equipment, fashionable wearable equipment and the like. The conductive material is an indispensable material between connecting components in the wearable device, and when the conductive material is used for the wearable device, flexibility and stretchability are two important indexes, so that the method for preparing the flexible conductive material by compounding the conductive material and the textile fiber which is used as the flexible material is the most applied method and has the best effect at present.

At present, two preparation methods are adopted for fiber-based flexible conductive yarns: one is a composite structure yarn with an outer layer made of textile fibers and an inner layer made of conductive materials; the other is to coat the conductive medium on the outer layer of the yarn. The latter requires a scientific design of the fabric structure to meet the electrical insulation requirements of human body contact garments, is limited in application, and has unstable resistance value during tensile deformation, and is difficult to achieve the properties of conductivity, flexibility and resistance invariance during deformation.

According to the invention, the conductive covering yarn is covered on the surface of the elastic fiber filament by using a covering yarn technology, and when the conductive covering yarn is covered on the surface of the elastic fiber filament, the drafting multiple of the elastic fiber filament is gradually increased in a cycle period according to the change rule of the drafting multiple of the elastic fiber filament, so that the stretching and recovery performances of yarns in different yarn sections are different. Within a certain range, the higher the draft multiple of the elastic fiber filament, the higher the stretchability of the yarn. According to the variable-elasticity conductive yarn, the conductive covering yarns are spirally covered on the surface of the elastic fiber filament, and when the conductive yarn is stretched, the conductive covering yarns spirally wound on the surface of the elastic fiber filament are insulated from each other and can extend along the extension direction of the elastic fiber filament, so that the variable-elasticity conductive yarn has the performances of conductivity, flexibility and stable resistance during deformation. The elastic force sensor can be widely applied to the field of wearable equipment, and is particularly suitable for parts such as elbows, knees and the like with inconsistent requirements on elastic performance.

Disclosure of Invention

The invention aims to provide a conductive yarn with variable elasticity, flexibility and resistance stability and a preparation method thereof.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

s1, spinning the conductive core-spun yarn by using a ring spinning machine, feeding a predetermined amount of fiber roving into a drafting zone for drafting by using the ring spinning machine, and pressing fiber strands obtained after drafting by a front roller;

after passing through a first unwinding mechanism and a first godet wheel, the conductive fiber filaments are fed from a front roller mouth and twisted and wrapped with fiber strands to form conductive core-spun yarns; the core yarn of the conductive core-spun yarn is a conductive fiber filament, and the outer cladding layer of the conductive core-spun yarn is fiber roving;

s2, preparing elastic conductive yarn by ring spinning, wherein the conductive covering yarn and the elastic fiber filament respectively pass through a second unwinding mechanism, a second godet wheel, a third unwinding mechanism and a third godet wheel correspondingly, and are simultaneously fed from a second front roller opening, twisted and wrapped to form the elastic conductive yarn. The core yarn of the elastic conductive yarn is elastic fiber filament, and the outer cladding layer of the elastic conductive yarn is conductive covering yarn.

The speed of a godet roller in a second unwinding mechanism through which the conductive core-spun yarn passes is kept unchanged, so that the drafting multiple of the conductive core-spun yarn is unchanged; the speed of a godet roller in a third unwinding mechanism through which the elastic fiber filament passes is periodically changed, so that the drafting multiple of the elastic fiber filament is periodically changed.

As a preferred technical scheme:

according to the elastic-variable conductive yarn and the preparation method thereof, the fiber roving is short fiber with poor conductivity and excellent mechanical property, such as terylene and nylon; the conductive fiber filament is a metal filament with excellent conductivity or a plated conductive fiber filament.

According to the elastic-variable conductive yarn and the preparation method thereof, the periodic variation of the draft multiple of the elastic fiber filament has the following periodic variation law:

wherein r is the drafting multiple of the elastic fiber filament, and the period of the yarn length change is L₁+L₂+L₃，L₁、L₂、L₃Respectively, the lengths of different sections in a period, and L is the length position of the yarn in the period.

The variable-elasticity conductive yarn and the preparation method thereof, wherein L is₁Has a length of 1-3 cm, L₂Has a length of 3-5 cm, L₃The length of (a) is 1-3 cm.

According to the variable-elasticity conductive yarn and the preparation method thereof, the variable-elasticity conductive yarn is formed by wrapping elastic fiber filaments with conductive covering yarns, the conductive covering yarns are formed by wrapping conductive fiber filaments with short fibers, the short fibers play roles in insulation and flexibility increasing, and the yarn count range of the conductive covering yarns is 10-60 English.

The invention provides a variable-elasticity conductive yarn, which has different stretchability and resilience of different yarn sections along with different draft multiples of elastic fiber filaments, has flexibility and resistance stability, and is suitable for parts with inconsistent elasticity requirements, such as elbows, knees and the like in wearable equipment.

The invention provides a preparation method of the conductive yarn, which comprises the steps of preparing the conductive core-spun yarn and preparing the variable-elasticity conductive yarn. The speed of the guide roller in the elastic fiber filament unwinding mechanism is periodically changed, so that the drafting multiple of the elastic fiber filament is periodically changed, and the stretchability and the resilience of the conductive yarn in different yarn sections are different.

The invention has the beneficial effects that: according to the invention, the outer covering yarn of the elastic conductive yarn is changed into the conductive covering yarn, the conductive covering yarn takes the conductive filament with the fiber flexibility characteristic as the core yarn, and takes the textile staple fiber as the outer covering yarn, so that the surface of the conductive filament is insulated, and the flexibility is still kept; the core yarn of the elastic conductive yarn is changed into the elastic fiber filament, the draft multiple of the elastic fiber filament is periodically changed in different yarn sections, the elastic utilization degree of the elastic fiber filament by the different yarn sections is different, so that the stretchability and the resilience of the different yarn sections of the prepared conductive yarn are different, the conductive yarn has great advantages in the aspects of being used as an intelligent lead, a flexible electrode and the like of wearable equipment, and is particularly suitable for parts with inconsistent elasticity requirements, such as elbows, knees and the like.

Drawings

Fig. 1 is a process schematic diagram of step S1 in the method for preparing the variable elasticity conductive core-spun yarn of the invention.

Fig. 2 is a process schematic diagram of step S2 in the method for preparing the variable elasticity conductive core-spun yarn of the invention.

1-roving; 2-a yarn guide hook; 3-a bell mouth; 4-back roller drafting pair; 5-middle roller drafting pair; 61-anterior epithelial roll; 62-front bottom roller; 7-conductive fiber filaments; 8-a yarn guide hook; 9-ring bobbin; 10-conductive core spun yarn; 11-a yarn guide hook; 12-a first godet wheel; 13-elastic fiber filaments; 21-a yarn guide hook; 22-a second godet wheel; 31-a third unwinding mechanism; 32-a third godet wheel; 100-variable elasticity conductive core-spun yarn.

Detailed Description

In order to more clearly illustrate the present invention, the following will further describe the variable elastic conductive yarn and the preparation method thereof in combination with the examples.

A variable-elasticity conductive yarn and a preparation method thereof comprise the following steps:

s1, spinning the conductive core-spun yarn by using ring spinning, feeding a predetermined amount of fiber roving through a horn mouth by using a device shown in figure 1, then drafting the fiber roving in a drafting zone, and pressing fiber strands obtained after drafting by a front roller; after passing through a first unwinding mechanism and a first godet wheel, the conductive fiber filaments are fed from a front roller mouth and twisted and wrapped with fiber strands to form conductive core-spun yarns; the core yarn of the conductive core-spun yarn is a conductive fiber filament, and the outer cladding layer is a fiber roving;

s2, preparing elastic conductive yarn by ring spinning, passing the conductive covering yarn and the elastic fiber filament through a second unwinding mechanism and a second godet wheel, a third unwinding mechanism and a third godet wheel respectively by using the device shown in figure 2, feeding from a second front roller opening, twisting and wrapping to form the elastic conductive yarn. The core yarn of the elastic conductive yarn is elastic fiber filament, and the outer covering layer is conductive covering yarn. The speed of a godet roller in a second unwinding mechanism through which the conductive core-spun yarn passes is kept unchanged, so that the drafting multiple of the conductive core-spun yarn is unchanged; the speed of a godet roller in a third unwinding mechanism through which the elastic fiber filament passes is periodically changed, so that the drafting multiple of the elastic fiber filament is periodically changed, and the periodic change rule is as follows:

wherein r is the drafting multiple of the elastic fiber filament, and the period of the yarn length change is L₁+L₂+L₃，L₁、L₂、L₃Respectively the length of different sections in a period, L is the length of the yarn in a periodAt the length position.

Example 1

The conductive core-spun yarn is formed by spinning 1.2D 38mm polyester staple fiber as an outer cladding layer and 25D silver-plated nylon yarn as a core layer by a ring spinning method, the yarn number of the conductive core-spun yarn is 32S, and the twist is 800 twists/m; the elastic fiber filament is 40D spandex L₁Has a length of 2cm, L₂Has a length of 4cm, L₃Is 2cm in length.

The obtained variable-elasticity conductive yarn L₁The minimum elastic elongation at break of the segment is 20%, the elastic recovery under a load of 50g is 55%, L₂The minimum elastic elongation at break of the segment is 30%, the elastic recovery under a load of 50g is 45%, L₃The minimum elastic elongation at break of the segment is 25% and the elastic recovery under a load of 50g is 50%. When the integral stretching deformation rate is 30%, the resistance change rate of the variable-elasticity conductive yarn is within 6%.

Example 2

The conductive covering yarn is made of 1.2D 38mm nylon staple fiber in the outer covering layer and 50D silver-plated nylon yarn in the core layer by a ring spinning method, the yarn number of the conductive covering yarn is 21S, and the twist is 800 twists/m; the elastic fiber filament is 70D spandex L₁Has a length of 3cm, L₂Has a length of 5cm, L₃Is 3cm in length.

The obtained variable-elasticity conductive yarn L₁The minimum elastic elongation at break of the segment is 25%, the elastic recovery under a load of 50g is 65%, L₂The minimum elastic elongation at break of the segment was 35%, the elastic recovery under a load of 50g was 55%, the minimum elastic elongation at break of the segment L3 was 30%, and the elastic recovery under a load of 50g was 60%. When the integral stretching deformation rate is 30%, the resistance change rate of the variable-elasticity conductive yarn is within 6%.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be appreciated by those skilled in the art that the present invention is not limited by the embodiments described above, which, as well as the descriptions in the specification, merely illustrate the principles of the invention. Any variations and alterations that would occur to one skilled in the art without departing from the spirit and scope of the invention as disclosed herein are intended to be covered by the present invention. The protection scope of the present invention shall be subject to the protection scope defined by the claims.