CN111979624A - Non-destructive covered yarn of high rigidity brittle fiber material, spinning method and fabric - Google Patents

Abstract

The invention discloses a non-destructive covering yarn with high rigidity and brittle fiber material, a weaving method and fabric thereof. The present invention forms a composite yarn core by performing forward composite twisting on the high-rigidity brittle fiber clamped by the flexible fiber under the twist condition lower than the maximum breaking torque of the high-rigidity brittle fiber filament; The composite yarn core is reversely twisted, and the flexible flame-retardant fiber is covered on the surface of the composite yarn core that is reversely twisted to form a core-shell structure composite yarn; the core-shell structure composite yarn is forwardly twisted by a double twister. It is twisted and twisted into strands, and woven together with a single core-shell composite yarn to form a fabric with excellent wearability. Through the above method, the present invention completely covers the high-rigidity brittle fiber filament under the condition that the high-rigidity brittle fiber filament is not damaged, so as to maximize the high-strength performance of the high-rigidity brittle fiber filament, and avoid the high-rigidity brittle fiber filament. Fractures and exposed fiber ends improve the wearability of its fabrics.

Description

Non-destructive covered yarn of high rigidity brittle fiber material, spinning method and fabric

technical field

The invention relates to the field of textile technology, in particular to a non-destructive covered yarn of a high-rigidity brittle fiber material, a spinning method and a fabric thereof.

Background technique

Basalt fiber, glass fiber, carbon fiber and other high-rigidity and brittle fiber materials not only have higher strength and modulus than ordinary fibers, but also have excellent high temperature resistance, flame retardancy and chemical stability, occupying an important position in the national economy and national defense industry. important position and broad application prospects. Therefore, yarns and fabrics spun based on high-rigidity and brittle fiber materials have also received extensive attention from researchers.

However, due to the insufficient flexibility and high brittleness of the high-rigidity brittle fiber material, it is prone to fracture and debris during the weaving process, which is not conducive to subsequent production and processing; at the same time, during the entire production and transportation process, the high-rigidity Fragile fibers are also susceptible to damage, resulting in severe surface fluff. In addition, when plying yarns made of high-rigidity and brittle fibers, due to factors such as uneven plying tension, it is easy to lead to poor bundling performance of fiber bundles and serious ply splitting. Therefore, how to spin high-rigidity brittle fiber materials into yarns and improve their wearability is the current research focus.

The patent with publication number CN102296389B provides a composite spinning device and spinning method in which chemical fiber filaments cover rigid fiber filaments. Larger, the problem of fiber bending and brittleness easily occurs during rewinding and weaving processing. It not only maintains the high strength and high model properties of carbon fiber, but also protects the carbon fiber filament from damage during processing and use. However, when the rigid fibers are wrapped and spun by the conventional ring spinning technology, in order to completely coat the rigid fiber filaments, a sufficient amount of twist needs to be applied, so that although the rigid fibers can be completely wrapped, the yarn The rigid fiber filaments covered in the body have been broken, which not only cannot effectively exert its high-strength performance, but also the broken fiber ends of the rigid fibers are easily exposed to the yarn body, forming burrs, which cause the wearer to experience discomfort such as itching and skin allergies when taking it. symptom. To eliminate these uncomfortable symptoms, the factory also needs to use multiple fabrics to cover, but this increases the load of wearing, and the weaving is complicated and troublesome. In addition, excessive twist during twisting will also lead to excessive reverse twist residual torque, resulting in the phenomenon of twist shrinkage, making rigid fibers easy to entangle and affecting the subsequent processing and weaving process.

In view of this, it is still necessary to conduct research on nondestructively covered yarns of high-rigidity and brittle fiber materials and their spinning methods and fabrics, so as to maximize the use of their high-strength properties while improving the wearability of yarns and their fabrics. performance to meet the needs of practical applications.

SUMMARY OF THE INVENTION

The purpose of the present invention is to aim at the above-mentioned problems and application requirements, to provide non-destructive covered yarns of high-rigidity brittle fiber materials and spinning methods and fabrics thereof. Perform forward composite twisting under the condition of high twist, and then use friction spinning technology for reverse twisting, so that the high-rigidity and brittle fiber filaments are non-destructively covered to form a composite yarn with a core-shell structure; the core-shell structure composite yarn passes through The double twisting machine is twisted into a non-destructive strand of brittle fiber filament in the core layer, and is woven together with a single core-shell structure composite yarn to form a high-strength fabric with excellent wearing performance (comfortable hand feel, no itchiness).

In order to achieve the above purpose, the present invention provides a spinning method for a non-destructively covered yarn of a high-rigidity brittle fiber material, comprising the following steps:

S1. At least one high-rigidity brittle fiber filament unwound from the high-rigidity brittle fiber filament package is output from the front jaw of the ring spinning frame, and will be unwound from the flexible fiber filament package. The two groups of flexible fiber filaments and the high-rigidity brittle fiber filaments are fed into the front jaw in parallel and spaced apart, so that the two groups of flexible fiber filaments are located on both sides of the high-rigidity and brittle fiber filaments, each The group of flexible fiber filaments includes at least one flexible fiber filament; after the high-rigidity brittle fiber filament output from the front jaw is clamped by the two sets of flexible fiber filaments, the Perform forward twisting under the twist condition of the maximum breaking torque of the rigid brittle fiber filament to form a composite yarn core, and wind the composite yarn core to a bobbin for use;

S2, the composite yarn core package obtained in step S1 and wound on the bobbin is installed on the bobbin support frame of the friction spinning machine, so that the composite yarn unwound from the composite yarn core package is along the bobbin. It is fed axially between two dust cages rotating in the same direction on the friction spinning machine; the flexible flame-retardant fiber strips are fed into the roller drafting mechanism of the friction spinning machine to be drawn into flexible flame-retardant fiber strips; the The flexible flame-retardant fiber whiskers are carded into a flexible flame-retardant fiber stream through the action of the opening roller of the friction spinning machine; the flexible flame-retardant fiber stream enters the wedge-shaped area between the dust cages and condenses in the wedge-shaped area. On the surface of the dust cage, agglomerated whiskers are formed, and two dust cages rotating in the same direction apply upward and downward frictional forces to the agglomerated whiskers respectively, forming a rotating force opposite to the twisting direction of the composite yarn core. The condensed whiskers are reversely twisted and wrapped around the surface layer of the reversely untwisted composite yarn core to form the reversely untwisted composite yarn core as the core, and the flexible flame-retardant fiber is reversely twisted and wrapped. The core-shell structure composite yarn is a shell, and the core-shell structure composite yarn is wound on a friction spinning bobbin for use.

Further, the spinning method of the high-rigidity brittle fiber material nondestructively covered yarn also includes twisting the core-shell structure composite yarn obtained in step S2 into strands, and the specific steps are as follows:

S3. The core-shell structure composite yarn unwound from at least two friction spinning bobbins is wound on the doubling bobbin to form a doubling bobbin package, and then the doubling bobbin winding device The double twisting process is carried out on the double twisting machine; the twisting disc of the double twisting machine is rotated forward, and the double core-shell structure composite yarn is subjected to forward twisting, so that the single core-shell structure composite yarn is internally twisted. The reverse-twisted composite yarn core is untwisted to a non-twisted state, and the doubling is twisted to form a core-shell structure composite yarn strand.

Further, the twist direction of the forward twist is Z, and the twist direction of the reverse twist is S; or the twist direction of the forward twist is S, and the twist direction of the reverse twist is Z.

Further, the twist of the reverse twist in step S2 is twice the twist of the forward twist in step S1.

Further, in step S1, the high-rigidity brittle fiber filaments are basalt fiber filaments or glass fiber filaments or quartz fiber filaments or carbon fiber filaments; the flexible fiber filaments are water-soluble vinylon filaments or polyester filaments Filament or polypropylene filament or nylon filament or viscose filament.

Further, in step S2, the flexible flame-retardant fiber is one of polyimide fiber, polyphenylene sulfide fiber, or aramid fiber or polytetrafluoroethylene fiber.

Further, the twist of the forward twist in step S3 is 0.5 times the twist of the reverse twist in step S2.

In order to achieve the above object, the present invention also provides a non-destructive covered yarn of high rigidity brittle fiber material, the non-destructive covered yarn of high rigidity and brittle fiber material includes a single yarn and a strand, and the single yarn is prepared according to the above technical solution. The single core-shell structure composite yarn, the strand is the core-shell structure composite yarn strand prepared according to the above technical scheme.

The present invention also provides a fabric, which is woven from the non-destructive covering yarn of the high-rigidity brittle fiber material.

Further, the warp yarn of the fabric is the core-shell structure composite yarn strand, and the weft yarn of the fabric is a single core-shell structure composite yarn.

Compared with the prior art, the beneficial effects of the present invention are:

1. The present invention adopts the ring spinning technology to implement forward composite twisting under the condition of twist lower than the maximum breaking torque of the high-rigidity brittle fiber filament, and then uses the friction spinning technology to perform reverse twisting, which can make the high-rigidity brittle fiber filament twist. The fiber filaments are non-destructively coated to form a composite yarn with a core-shell structure. In addition, the core-shell structure composite yarn is twisted into a non-destructive strand of brittle fiber filaments in the core layer through a double twister, and is woven together with a single core-shell structure composite yarn to form an excellent wearing performance (comfortable hand, no itchiness). ) of high-strength fabrics.

2. The present invention can prevent the high-rigidity brittle filament from breaking by controlling the twist of the ring spinning process so that the twisting torque is lower than the maximum breaking torque of the high-rigidity filament, and realizes the high-rigidity brittle filament. At the same time, the present invention continues friction spinning on the composite yarn core formed by the high-rigidity fiber filament and the flexible fiber filament obtained by ring spinning, which can utilize the dust from two co-rotating spinning machines in the friction spinning machine. The cage forms a rotating force opposite to the twisting direction of the composite yarn core, so that the composite yarn core is covered with flexible flame-retardant fibers without continuing to increase the twist of the composite yarn core, so as to ensure that the high-rigidity brittle fiber filaments are completely covered . Through the synergistic effect of the above-mentioned ring spinning and friction spinning, the present invention completely covers the high-rigidity and brittle fiber filament under the condition that the high-rigidity and brittle fiber filament is not damaged, and avoids the coating by increasing the twist in the prior art. High-rigidity and brittle fiber breakage, burr and twisting phenomenon caused by high-rigidity and brittle fiber filaments, so as to maximize the high-strength performance of high-rigidity and brittle fiber filaments, and reduce the impact of brittleness on its product performance during the production process and improve its fabric. consumption performance.

3. The present invention also uses a double twister to twist the prepared core-shell composite yarn into strands, and controls the double twister to perform forward twisting on the double-twisted core-shell composite yarn to make a single core-shell structure. The reverse-twisted composite yarn core inside the composite yarn is untwisted to an untwisted state, and at the same time, the doubling is twisted to form a core-shell structure composite yarn strand. This process can not only effectively twist a single core-shell composite yarn into strands to improve its mechanical properties; it can also avoid the breakage of high-rigidity and brittle fibers caused by the increase in twist caused by the traditional twisting in the same direction, making the core-shell composite yarn The high-rigidity and brittle fibers in the medium remain undamaged during the twisting process, and further improve the wearing performance of their fabrics.

4. The high-rigidity brittle fiber material provided by the present invention has a simple non-destructive covering spinning method, is easy to industrialize large-scale production, and the obtained high-rigidity brittle fiber non-destructive covering yarn and the high-rigidity brittle fiber material in the fabric are coated The covering is complete, and it is not easy to break and produce burrs during the overall spinning, weaving and wearing. It does not need multiple fabric coverings, which reduces the discomfort and weight of wearing. It has better wearing performance and can meet the needs of practical applications. Has high application value.

Description of drawings

Fig. 1 is the structural representation of the ring spinning device used in the non-destructive covering spinning method of high-rigidity brittle fiber material provided by the present invention;

Fig. 2 is the structure schematic diagram of the friction spinning device used in the non-destructive covering spinning method of high-rigidity brittle fiber material provided by the present invention;

Fig. 3 is the preparation flow schematic diagram of the fabric prepared in the embodiment of the present invention 2;

Fig. 4 is the physical picture of the non-destructive covered yarn of high rigidity brittle fiber material prepared in Example 2 of the present invention;

Fig. 5 is the physical map of the fabric prepared in the embodiment of the present invention 2;

The symbols of the components in the drawings are as follows: 1. The first fixed wire guide device; 2. The second fixed wire guide device; 3. The front roller; 4. The front top roller; 5. The ring spinning yarn guide hook; 6 , traveler; 7, steel ring; 8, bobbin; 9, bobbin support frame; 10, yarn guide hole; 11, warp tension sheet; 12, dust cage; 13, roller drafting mechanism; 14, opening roller ; 15, the first take-off roller; 16, the second take-off roller; 17, the friction spinning yarn guide hook; 18, the yarn guide traverse device; 19, the groove drum.

Detailed ways

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the protection scope of the present invention can be more clearly defined. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

The present invention provides a spinning method for non-destructively covered yarn of high-rigidity and brittle fiber material, comprising the following steps:

S1. At least one high-rigidity brittle fiber filament unwound from the high-rigidity brittle fiber filament package is output from the front jaw of the ring spinning frame, and will be unwound from the flexible fiber filament package. The two groups of flexible fiber filaments and the high-rigidity brittle fiber filaments are fed into the front jaw in parallel and spaced apart, so that the two groups of flexible fiber filaments are located on both sides of the high-rigidity and brittle fiber filaments, each The group of flexible fiber filaments includes at least one flexible fiber filament; after the high-rigidity brittle fiber filament output from the front jaw is clamped by the two sets of flexible fiber filaments, the Perform forward twisting under the twist condition of the maximum breaking torque of the rigid brittle fiber filament to form a composite yarn core, and wind the composite yarn core to the bobbin 8 for standby;

S2, install the composite yarn core package wound on the bobbin 8 obtained in step S1 on the bobbin support frame 9 of the friction spinning machine, so that the composite yarn core package unwound from the composite yarn core package The yarn is fed in the axial direction between the two dust cages 12 on the friction spinning machine that rotate in the same direction; the flexible flame-retardant fiber strips are fed into the roller drafting mechanism 13 of the friction spinning machine to be drawn into flexible flame-retardant fibers. The flexible flame-retardant fiber must be carded into a flexible flame-retardant fiber stream through the action of the carding roller 14 of the friction spinning machine; the flexible flame-retardant fiber stream enters the wedge-shaped area between the dust cages 12, and Condensed on the surface of the dust cage 12 in the wedge-shaped area to form agglomerated whiskers, and the two dust cages 12 rotating in the same direction exert upward and downward frictional forces on the agglomerated whiskers respectively, forming a composite yarn core with the The twisting force in the opposite direction of twisting reversely twists the condensed whiskers and wraps them on the surface layer of the reversely untwisted composite yarn core to form the reversely untwisted composite yarn core as the core and flexible The flame-retardant fibers are reversely twisted and wrapped to form a shell-core-shell composite yarn, and the core-shell composite yarn is wound onto a friction spinning bobbin for use.

The spinning method of the high-rigidity brittle fiber material non-destructively covered yarn also includes twisting the core-shell structure composite yarn obtained in step S2 into strands, and the specific steps are as follows:

S3. The core-shell structure composite yarn unwound from at least two friction spinning bobbins is wound on the doubling bobbin to form a doubling bobbin package, and then the doubling bobbin winding device The double twisting process is carried out on the double twisting machine; the twisting disc of the double twisting machine is rotated forward, and the double core-shell structure composite yarn is subjected to forward twisting, so that the single core-shell structure composite yarn is internally twisted. The reverse-twisted composite yarn core is untwisted to a non-twisted state, and the doubling is twisted to form a core-shell structure composite yarn strand.

The twist direction of the forward twist is Z, and the twist direction of the reverse twist is S; or the twist direction of the forward twist is S, and the twist direction of the reverse twist is Z.

The twist in the reverse twist in step S2 is twice the twist in the forward twist in step S1.

In step S1, the high-rigidity and brittle fiber filaments are basalt fiber filaments or glass fiber filaments or quartz fiber filaments or carbon fiber filaments; the flexible fiber filaments are water-soluble vinylon filaments or polyester filaments or Polypropylene filament or nylon filament or viscose filament.

In step S2, the flexible flame-retardant fiber is one of polyimide fiber, polyphenylene sulfide fiber, or aramid fiber or polytetrafluoroethylene fiber.

The twist in the forward twist in step S3 is 0.5 times the twist in the reverse twist in step S2.

The present invention also provides a high-rigidity and brittle fiber material nondestructively covered yarn, the high-rigidity and brittle fiber material nondestructively covered yarn includes a single yarn and a strand, and the single yarn is the single yarn prepared according to the above technical solution. A core-shell structure composite yarn, the strands are the core-shell structure composite yarn strands prepared according to the above technical solutions.

The present invention also provides a fabric, which is woven from the non-destructive covering yarn of the high-rigidity brittle fiber material.

The warp yarn of the fabric is the core-shell structure composite yarn strand, and the weft yarn of the fabric is a single core-shell structure composite yarn.

The non-destructive covered yarn of high-rigidity and brittle fiber material provided by the present invention and its spinning method and fabric are further described in detail below through specific examples.

Example 1

This embodiment provides a spinning method for non-destructively covered yarns of high-rigidity and brittle fiber materials, including the following steps:

S1, flexible fiber composite twisting

Referring to Figure 1, on each drafting mechanism of the ring spinning frame, a basalt fiber filament unwound from the basalt fiber filament package located on the positive unwinding device passes through the first fixed guide wire. Device 1, the front jaw composed of front roller 3 and front top roller 4 is output; at the same time, two water-soluble vinylon filaments unwinded from the water-soluble vinylon filament package located on the positive unwinding device are passed through the first Two fixed wire guide devices 2, which are fed into the front jaws in parallel with the basalt fiber filaments. The two water-soluble vinylon filaments are located on both sides of the basalt fiber filaments. The silk is merged with a basalt fiber filament, and the basalt fiber filament is sandwiched by two water-soluble vinylon filaments, and is twisted in a forward direction under the condition that the maximum breaking torque of the basalt fiber filament is lower than the maximum breaking torque of the basalt fiber filament to synthesize basalt fiber. Filament and water-soluble vinylon filament composite yarn core, the composite yarn core enters the ring spinning yarn guide hook 5 adjacent to the oblique lower part of the front jaw in a left oblique manner, and enters the ring spinning yarn guide hook 5 after the ring spinning yarn guide hook 5. The composite yarn core passes through the corresponding traveler 6 and the steel ring 7 in sequence, and is finally wound onto the bobbin 8 .

In the above-mentioned ring spinning process, the model of the ring spinning machine used is HFX-A6, and the parameters are set as follows: the speed of the ring spindle is 5000r/min, the wire speed of the front ring is 16.00m/min, the twist is 312T/m, Front zone draft 30.76, total draft 43.24, twist Z. In this embodiment, the twist is set to 312T/m, which can ensure that the torque of the high-rigidity brittle fiber filament twisted at this twist is lower than its maximum breaking torque, thereby preventing the high-rigidity brittle fiber filament from breaking Non-destructive coating of high stiffness brittle fiber filaments. In other embodiments, the twist can be adjusted so that the torque of the high-rigidity brittle fiber filament under the twist is lower than its maximum breaking torque, preferably 180-370 T/m.

S2, friction spinning reverse twisting core-spun yarn

Referring to Figure 2, the basalt fiber filament and the water-soluble vinylon filament composite yarn core coil wound on the bobbin 8 is installed on the bobbin support frame 9 of the friction spinning machine, and is unwound from the bobbin package. The basalt fiber filament and the water-soluble vinylon filament composite yarn pass through the yarn guide hole 10, pass through the tension sheet 11, and feed into the two dust cages 12 rotating in the same direction on the friction spinning machine in the axial direction; The raw imide fiber sliver is fed into the roller drafting mechanism 13, and after being combed and decomposed into single fibers by the opening roller 14, due to the suction inside the dust cage 12, the polyimide fiber falls into the wedge-shaped groove between the two dust cages 12. Inside, the two dust cages 12 rotate in the same direction, one produces an upward frictional force on the condensed whiskers, and the other produces a downward frictional force on the agglomerated whiskers, so as to form the basalt fiber filament and the water-soluble vinylon long. The twisting force of the silk composite yarn core is opposite to the twisting direction, and the polyimide fiber is wrapped on the surface of the composite yarn core that is untwisted to obtain the reverse twisting, and the composite yarn core that is reversely twisted is made as the core. 2. The core-shell structure composite yarn with polyimide fiber as the shell, the core-shell structure composite yarn is pulled out of the dust cage jaw line by the first take-off roller 15 and the second take-off roller 16, and then is friction-spun in turn. The yarn guide hook 17, the yarn guide traverse device 18, and the groove drum 19 are finally wound on the friction spinning bobbin.

In the above friction spinning process, the type of friction spinning machine used is HFX-02, and the parameters are set as follows: opening roller 3500r/min, friction roller 2000r/min, output speed 6.00m/min, coiling speed 6.4m/min; twist 624T/m, twist direction S; feeding speed of polyimide fiber is 0.6m/min.

Through the above spinning method, a single core-shell composite yarn is obtained in this example, the basalt fiber in the core layer and the water-soluble Velen filament composite yarn core are completely covered, and the yarn is uniform and the surface of the yarn body is completely covered. It is smooth, there is no burr caused by basalt fiber breakage, and the wearability is better, which can meet the needs of practical applications.

Example 2

This embodiment provides a spinning method for non-destructively covered yarns of high-rigidity and brittle fiber materials, including the following steps:

S1, flexible fiber composite twisting

S2, friction spinning reverse twisting core-spun yarn

S3, twisted into strands

In the above steps, steps S1 and S2 are consistent with Embodiment 1, which will not be repeated here. The specific process of step S3 is as follows:

On each winding mechanism of the doubling machine, the core-shell structure composite yarn unwound from the two friction spinning bobbins is wound through the doubling machine yarn guide, tensioner and doubling machine in turn. , wound on the parallel bobbin to form a parallel bobbin package. Place the doubling bobbin package in the yarn storage tank of the double twisting machine, and each doubling thread unwound from the doubling bobbin package passes through the double twisting machine flyer and enters the double twisting machine hollow spindle. In the hollow shaft of the double twister, the tensioner in the hollow shaft and the yarn feed tube in the positioning sleeve of the double twister are drawn out from the outlet of the yarn output tube of the twisting disc of the double twister, and then pass through the yarn guide ring and enter the yarn guide. At the jaw of the yarn roller, under the combined action of the jaw of the delivery roller and the tensioner, the fiber strip from the tensioner to the jaw of the delivery roller is subjected to a pulling force, and the pulling force pulls the inner fiber along the fiber strip. The length direction of the strip is stretched to increase the fiber orientation. Under the combined action of the inner magnet and the fixed magnet installed on the double twisting machine table, the yarn storage tank and the stationary disc are stationary, and the spindle belt drives the twisting disc of the double twisting machine. Forward rotation, double the number of rotations of the twisting disc to perform forward twisting on the doubling line between the flyer and the take-off roller jaw, so that the reverse twist inside the single core-shell composite yarn is compounded The yarn core is untwisted to the untwisted state, and at the same time, the doubling threads are twisted to form a core-shell structure composite yarn; The moving device, the double twisting machine groove drum, and finally wound onto the double twisting machine bobbin.

In the above process, the parameters of the double twisting machine used are set as follows: the speed of the ring spindle is 4097r/min, the wire speed is 18.00m/min, the twist is 312T/m, and the twist direction is Z.

The core-shell structure composite yarn and its strands prepared by the above method can also be used for the weaving of fabrics, and the specific weaving process is as follows:

Referring to Fig. 3, the core-shell structure composite yarn prepared in step S3 of the present embodiment is used as the warp yarn, and the single core-shell structure composite yarn prepared in the step S2 of the present embodiment is used as the weft yarn. SGA598-SD type semi-automatic small prototype is used for For weaving, the weaving structure was set as plain weave, reed size 60, width 15, and a woven fabric woven from the core-shell structure composite yarn prepared in this example and its strands was obtained.

The physical diagrams of the core-shell structure composite yarn strands and their fabrics prepared by the above process are shown in Figures 4 and 5, respectively. It can be seen from Figure 4 that the core-shell structure composite yarn prepared in this example is uniform in yarn formation, the basalt fibers inside the yarn are completely covered, no burrs caused by breakage can be seen, and the surface of the yarn body is smooth. It can be seen from Figure 5 that the core-shell structure composite yarn and its strands prepared in this embodiment have no obvious burrs on the surface, do not need to add multiple fabric coverings, can keep light, thin and soft, and improve the comfort of the wearing process.

In addition, the mechanical properties of the core-shell structure composite yarn prepared in this example were further tested, and the breaking strength was measured to be 30N, and the breaking elongation was 1.8%.

It can be seen from this that the spinning method provided in this embodiment can maximize the use of the high-strength performance of basalt fibers by non-destructively coating the basalt fibers with high rigidity and brittleness, so that the prepared core-shell structure composite yarn strands The wire has a high breaking strength to meet the needs of practical applications.

Examples 3 to 4

Embodiments 3 to 4 respectively provide a spinning method for non-destructively covered yarns of high-rigidity and brittle fiber materials. The relevant spinning parameters have been adjusted, and the remaining steps are the same as those in Example 2, which will not be repeated here. The types and spinning parameters of the high-rigidity brittle fiber materials corresponding to each embodiment are shown in Table 1.

Table 1 Types and corresponding parameters of high-rigidity brittle fiber materials corresponding to Examples 3-4

According to the parameters listed in Table 1, Examples 3 to 4 respectively prepared a kind of non-destructive covered yarn of high rigidity and brittle fiber material, which is the composite yarn of core-shell structure. The mechanical properties of the non-destructive covered yarns of the high-rigidity brittle fiber materials prepared in Examples 3-4 were further tested, and the results are shown in Table 2. It can be seen from Table 2 that the non-destructive covered yarns of high rigidity and brittle fiber materials prepared in Examples 3 to 4 all have higher breaking strength and suitable breaking elongation. And the surface of the yarn is smooth, the internal high-rigidity and brittle fibers are completely covered, and there is no burr caused by internal fiber breakage. It shows that the spinning method provided by the present invention can non-destructively coat the fibers with high rigidity and brittleness such as basalt fiber, glass fiber and carbon fiber, so as to maximize the use of the high-strength properties of such fibers, and make the prepared core-shell structure The composite yarn strands have high breaking strength; and the process parameters of the spinning process can be adjusted according to actual needs, which can meet the requirements of actual production and application.

Table 2 Mechanical properties of non-destructive covered yarns of high-rigidity and brittle fiber materials prepared in Examples 3-4

Example Breaking strength Elongation at break Example 3 31N 2.7% Example 4 35N 1.5%

Comparative Example 1

Comparative example 1 provides a spinning method of covering yarn with high rigidity and brittle fiber material. Compared with example 2, the difference is that comparative example 1 only adopts ring spinning technology to prepare a single long basalt fiber. The composite fiber of silk and water-soluble Velen filament is twisted by a double twister, and friction spinning is not performed during the overall spinning process.

Through the above method, a high-rigidity brittle fiber material-coated yarn was prepared in Comparative Example 1; the mechanical properties of the yarn were tested, and the breaking strength was measured to be 7.6N and the breaking elongation was 3.8%.

Compared with the mechanical property data of Example 2, it can be seen that the high-rigidity brittle fiber material-coated yarn prepared according to the method provided by the present invention has significantly higher breaking strength. Mainly because the present invention firstly adopts the ring spinning technology to implement forward composite twisting under the condition of lower than the maximum breaking torque of the high-rigidity brittle fiber filament, and then adopts the friction spinning technology to perform reverse twisting, which can ensure high stability. The rigid and brittle fiber filaments are completely covered under the condition that they are not damaged, which solves the problem that the high-rigidity and brittle fibers are easily broken, burrs and twists caused by excessive twisting when only the ring spinning technology is used for covering in the prior art. In order to maximize the use of the high-strength properties of high-rigidity and brittle fibers, reduce the impact of their brittleness on the production process, improve the mechanical strength of the yarn, and ensure the wearability of its fabrics.

To sum up, the present invention forms a composite yarn core by performing forward composite twisting on the high-rigidity brittle fiber clamped by the flexible fiber under the condition that the maximum breaking torque of the high-rigidity brittle fiber filament is lower than the maximum breaking torque; The technology reversely twists the composite yarn core, and wraps the flexible flame-retardant fiber on the surface of the composite yarn core that is reversely twisted to form a core-shell structure composite yarn; The twisting machine twists and twists into strands in the forward direction, and is woven together with a single core-shell structure composite yarn to form a fabric with better wearability. Through the above method, the present invention can completely cover the high-rigidity and brittle fiber filament under the condition that it is not damaged, so as to maximize the use of the high-strength performance of the high-rigidity and brittle fiber, and reduce its brittleness to the production process and its product performance. influence to ensure the wearing performance of its fabrics.

It should be noted that those skilled in the art should understand that the high-rigidity brittle fiber filaments can be basalt fiber filaments or glass fiber filaments or quartz fiber filaments or carbon fiber filaments, and the flexible fiber filaments can be water-soluble Polyvinyl filament or polyester filament or polypropylene filament or nylon filament or viscose filament, the flexible flame retardant fiber is polyimide fiber or polyphenylene sulfide fiber or aramid fiber or polytetrafluoroethylene Fibers belong to the protection scope of the present invention.

The above descriptions are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: Modifications are made to the recorded technical solutions, or some or all of its technical features are equivalently replaced; any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly used in other related technical fields , are similarly included in the scope of patent protection of the present invention.

Claims (10)

1. a spinning method of high-rigidity brittle fiber material non-destructive covering yarn, is characterized in that, comprises the steps: S1. At least one high-rigidity brittle fiber filament unwound from the high-rigidity brittle fiber filament package is output from the front jaw of the ring spinning frame, and will be unwound from the flexible fiber filament package. The two groups of flexible fiber filaments and the high-rigidity brittle fiber filaments are fed into the front jaw in parallel and spaced apart, so that the two groups of flexible fiber filaments are located on both sides of the high-rigidity and brittle fiber filaments, each The group of flexible fiber filaments includes at least one flexible fiber filament; after the high-rigidity brittle fiber filament output from the front jaw is clamped by the two sets of flexible fiber filaments, the Perform forward twisting under the twist condition of the maximum breaking torque of the rigid brittle fiber filament to form a composite yarn core, and wind the composite yarn core to a bobbin for use; S2, the composite yarn core package obtained in step S1 and wound on the bobbin is installed on the bobbin support frame of the friction spinning machine, so that the composite yarn unwound from the composite yarn core package is along the bobbin. It is fed axially between two dust cages rotating in the same direction on the friction spinning machine; the flexible flame-retardant fiber strips are fed into the roller drafting mechanism of the friction spinning machine to be drawn into flexible flame-retardant fiber strips; the The flexible flame-retardant fiber whiskers are carded into a flexible flame-retardant fiber stream through the action of the opening roller of the friction spinning machine; the flexible flame-retardant fiber stream enters the wedge-shaped area between the dust cages and condenses in the wedge-shaped area. On the surface of the dust cage, agglomerated whiskers are formed, and two dust cages rotating in the same direction apply upward and downward frictional forces to the agglomerated whiskers respectively, forming a rotating force opposite to the twisting direction of the composite yarn core. The condensed whiskers are reversely twisted and wrapped around the surface layer of the reversely untwisted composite yarn core to form the reversely untwisted composite yarn core as the core, and the flexible flame-retardant fiber is reversely twisted and wrapped. The core-shell structure composite yarn is a shell, and the core-shell structure composite yarn is wound on a friction spinning bobbin for use. 2 . The spinning method for non-destructively covered yarns of high-rigidity and brittle fiber materials according to claim 1, wherein the spinning method for non-destructively covered yarns of high-rigidity and brittle fiber materials further comprises obtaining step S2. The described core-shell structure composite yarn is twisted into strands, and the specific steps are as follows: S3. The core-shell structure composite yarn unwound from at least two friction spinning bobbins is wound on the doubling bobbin to form a doubling bobbin package, and then the doubling bobbin winding device The double twisting process is carried out on the double twisting machine; the twisting disc of the double twisting machine is rotated forward, and the double core-shell structure composite yarn is subjected to forward twisting, so that the single core-shell structure composite yarn is internally twisted. The reverse-twisted composite yarn core is untwisted to a non-twisted state, and the doubling is twisted to form a core-shell structure composite yarn strand. 3. The spinning method for non-destructively covered yarn of high rigidity and brittle fiber material according to claim 1, wherein the twist direction of the forward twist is Z, and the twist direction of the reverse twist is S; or the twist direction of the forward twist is S, and the twist direction of the reverse twist is Z. 4. The method for spinning non-destructively covered yarns of high-rigidity and brittle fiber materials according to claim 1, wherein the twist of the reverse twist in step S2 is the twist of the forward twist in step S1 2 times. 5. The spinning method of high-rigidity brittle fiber material nondestructively covered yarn according to claim 1, wherein in step S1, the high-rigidity and brittle fiber filament is basalt fiber filament or glass fiber filament Silk or quartz fiber filaments or carbon fiber filaments; the flexible fiber filaments are water-soluble vinylon filaments or polyester filaments or polypropylene filaments or nylon filaments or viscose filaments. 6 . The method for spinning non-destructively covered yarns of high-rigidity and brittle fiber materials according to claim 1 , wherein in step S2, the flexible flame-retardant fibers are polyimide fibers or polyphenylene sulfide. 7 . fiber or or aramid fiber or teflon fiber. 7 . The method for spinning non-destructively covered yarns of high-rigidity and brittle fiber materials according to claim 2 , wherein the twist in the forward twist in step S3 is the reverse twist in step S2 . 8 . 0.5 times. 8. A high-rigidity brittle fiber material nondestructively covered yarn, characterized in that: the high-rigidity brittle fiber material nondestructively covered yarn comprises a single yarn and a strand, and the single yarn is according to claim 1. A single core-shell structure composite yarn prepared by a spinning method, and the strand is the core-shell structure composite yarn strand prepared by the spinning method according to any one of claims 2 to 7 . 9 . A fabric, characterized in that: the fabric is woven from the non-destructively covered yarn of the high-rigidity brittle fiber material according to claim 8 . 10 . The fabric according to claim 9 , wherein the warp yarn of the fabric is the core-shell composite yarn strand, and the weft yarn of the fabric is a single core-shell composite yarn. 11 .

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