JP7362149B2 - Multicore core yarn structure and its production process that improves the stability of core yarn coating - Google Patents

Description

The present invention relates to the field of multifilamentary core yarn technology, and more particularly to a multifilamentary core yarn structure that improves the stability of the core yarn coating and a process for making the same.

Core yarn is a very important composite yarn, having two constituents: a core yarn and a covering short fiber. Through the core yarn coating process, both are manufactured into a yarn with a remarkable core yarn structure, thereby exhibiting the respective characteristics of the core yarn and the coated fiber, and the finished yarn product combines the yarn performance that combines both. let

In the prior art, a hard filament such as a single or multiple glass filament, metallic yarn, basalt filament, etc. is generally used as the core yarn. For example, a conventional utility model with assessment publication number CN206127534U discloses a multi-core yarn and its double twist, the core yarn and gloves and fabrics woven therefrom. This application adopts the following technical measures. The multifilamentary core yarn includes a core layer and a covering layer, the core layer includes two or more core yarns, and the core yarn is a hard core yarn with an elongation at break of less than 50% as measured by the ISO 2062 method, As the core thread, one or more of glass filament, metallic yarn, and basalt filament is used. This technical solution changes the conventional core yarn covering structure with one core yarn to a core yarn covering structure with multiple ultra-fine core yarns, but the core yarn is made of glass filament, metallic yarn or basalt filament. Use one or more of them.

These core yarns can be generally divided into two types: metallic yarns and mineral fibers, but metallic yarns and mineral fibers each have defects. Metallic yarns, such as wires, will generally not have the resilience to recover after being stretched. Mineral fibers include, for example, basalt filaments, which are relatively brittle and tend to break after being stretched. Although these core yarns have elongation performance, their recovery properties after elongation are still not high. When protective equipment such as gloves and oversleeves are repeatedly put on and taken off, the core thread is repeatedly bent and pulled, and the core thread is basically unable to return to its original state under actual usage conditions. Further, due to the above-mentioned cause, a problem may occur in which the core yarn is exposed.

In view of the deficiencies existing in the prior art, a first objective of the present invention is to provide a multi-core yarn structure that improves the stability of the core yarn coating.

The first object of the present invention is achieved by the following technical solution. A multifilamentary core yarn structure that improves the stability of the core yarn coating, including a core yarn and a covering yarn, the core yarn having at least two core yarns, the covering yarn covering the outside of the core yarn, and at least one core yarn. The core yarn is made of a hard filament, and at least one of the core yarns is a buffer core yarn with a breaking elongation rate of less than 50% and an elastic recovery rate of less than 30%, and the hard filament yarn and the buffer core yarn are used. are wrapped around each other or arranged parallel to each other.

By adopting the above technical solution, one of the core yarns is a buffer core yarn that has an elongation ability and a recovery ability, and is wound with a hard filament, and the buffer core yarn covers the hard filament. Instead, it can provide deformability, providing spreadability for gloves knitted with this type of multicore yarn. If the hard filament is a metallic yarn, it has no recovery ability after stretching, and the remaining part after stretching can be wrapped around the buffer core yarn. The use of a buffer core yarn results in very little protrusion on a single helical ring, making the problem of metallic yarn protrusion and exposure in the background art less likely to occur. If the hard filament is a mineral fiber, if there is a situation where it breaks, the buffer core yarn wraps around and protects the mineral fiber, so the core yarn is still relatively stable and prevents the situation where the broken hard filament is exposed for a long time. Avoid occurrence. The buffer core yarn is configured as a buffer protection material when the hard filament protrudes or breaks, and together with the hard filament constitutes the core yarn that has a buffering function and has a stable structure. In addition, when the core yarns are arranged in parallel, when the yarn is pulled in the longitudinal direction, the buffer core yarn as a buffer yarn receives most of the pulling force, and the other hard filament receives less pulling force, so the core yarn will not break or be stretched too long.

A buffer core yarn with a breaking elongation rate of more than 50% has an excessively large deformable range, and the yarn per count is generally relatively thick. A buffer core yarn with an elastic recovery rate of less than 10% has low recovery performance and cannot meet the use requirements for glove malleability. A buffer core yarn with an elastic recovery rate greater than 30% has too strong a recovery performance, and tends to cause the problem that the hard filaments are pressed and protrude.

In a preferred embodiment, the invention is further configured as follows. The elastic recovery rate is expressed by the formula
In the formula, ΔL=Li−Lii, RLII represents the recovery state after the buffer core yarn is stretched as a percentage, and Li is the entire length of the buffer core yarn after stretching. and Lii is the total length of the stretched buffer core thread when it returns to the fixed state after being released.

By adopting the above technical solution, the calculation of the elastic recovery rate of the buffer core yarn is limited, and not all fibers can be applied as the buffer protection material of the hard filament.

In a preferred embodiment, the invention is further configured as follows. The covered yarn is a short fiber, and the plurality of short fibers are assembled on the surface layer of at least two core yarns to form a multifilamentary core yarn, and the short fibers are polyethylene short fibers, aramid short fibers, polyester, One or more of nylon, viscose, tencel, modal, polypropylene, carton, and acrylic fibers.

By adopting the above technical solution, a plurality of short fibers are used, the short fibers are thin, have a large number of counts, are light and thin, and the produced multifilament core yarn and fabric thereof are soft and have a good feel. However, the short fibers may be made of the same type of material or may be made of different types of materials in combination, and when different materials are used, the overall performance of the fabric can be improved.

All of the above-mentioned materials provide the core yarn with cut prevention ability and cushioning protection ability, and further improve its reinforcing performance. Polyethylene short fibers can improve the strength, cut resistance and abrasion resistance of textiles. Aramid short fibers can improve strength, cut resistance and flame retardancy. Polyester and nylon can improve strength and comfort. Fabrics produced using viscose fibers have the advantages of being smooth and refreshing, breathable, anti-static, anti-ultraviolet rays, bright and beautiful in color, and have higher color fastness. Fabrics made with Tencel are smooth to the touch. Fabrics made using modal have excellent sweat absorption, quick drying properties, and breathability. The fabric made with polypropylene short fibers not only prevents cutting, but also has the advantage of having a remarkable moisture absorption effect and being soft to the touch.

In a preferred embodiment, the invention is further configured as follows. The length of the short fibers is 20 mm to 75 mm, and the thickness of the short fibers is 0.8D to 3.5D.

By employing the above technical solution, the short fibers have high flexibility, and the bonds between the short fibers and the covering effect are high.

In a preferred embodiment, the invention is further configured as follows. The buffer core yarn is at least one of polyester, polyethylene, aramid, nylon, polypropylene, and mineral fiber.

By adopting the above technical solution, the polyester filament, polyethylene filament and aramid 1414 filament all have good strength, abrasion resistance and elasticity.

The second objective of the present invention is to provide a process for producing a multi-core yarn structure that improves the stability of the core yarn coating, and the technical solution thereof is as follows:
In Step 1 of selecting materials, the hard filament is selected from one of metallic yarn and mineral fiber, and the buffer core yarn is selected from a material having an elongation at break of less than 50% and an elastic recovery rate of less than 30%. Selecting small fibers, the elastic recovery rate value can be calculated by RLII=ΔL/Li×100, where ΔL=Li−Lii;
step 2 of double twisting, the hard filament and the buffer core yarn are wound around each other in the Z direction or the S direction using a double twister or a wrapping machine to obtain the core yarn;
Step 3 of coating comprises the step of manufacturing the covered yarn and the core yarn into a multi-filamentary core yarn by a core yarn coating process.

By adopting the above technical solution, a method for producing multicore yarn is provided, and compared with the conventional process, this solution attaches importance to material selection, and the selection of raw materials is more special. The other core yarn selected in this solution not only satisfies the requirement for elongation at break, but also satisfies the requirement for elastic recovery rate in order to play the role of cushioning and protection for the hard filament core yarn. I can do it.

In a preferred embodiment, the invention is further configured as follows. In step 1, the method for obtaining the calculated value of the elastic recovery rate is to cut the selected buffer core yarn into multiple segments of equal length, use some of the segments as samples, and measure the rated length in the range of 100-500 mm. Arbitrarily specify one length as the length, take this length as the original length L0, pull the sample using a tensioning machine, make the pulling distance of each sample the same, and make the total length of the sample after being pulled Li. , release the tension on the sample, measure the entire length when the sample is in a stable state without deformation, set this length as Lii, and finally calculate the three numbers L0, Li, Lii. The method is to calculate the elastic recovery rate and select the cushioning core thread.

By adopting the above technical solution, it is possible to obtain an accurate value of the elastic recovery rate, thereby obtaining a preferable cushioning core yarn.

The third objective of the present invention is to provide a process for producing a multi-core yarn structure that improves the stability of the core yarn coating, and the technical solution thereof is as follows:
In step 1 of selecting materials, one of metallic yarn and mineral fiber is selected for the hard filament, and the buffering core yarn has an elongation at break of less than 50% and an elastic recovery rate of less than 30%. Selecting the fiber, the value of the elastic recovery rate can be obtained by calculating by RLII=ΔL/Li×100, where ΔL=Li−Lii;
Step 2 of double twisting, a step of arranging the hard filament and the buffer core yarn in parallel using a yarn doubling machine to obtain the core yarn;
Step 3 of coating comprises the step of manufacturing the covered yarn and the core yarn into a multi-filamentary core yarn by a core yarn coating process.

By adopting the above technical solution, we provide another method for producing multi-filamentary core yarns, the main difference from the previous method being the arrangement method of the two core yarns. When the threads are lined in parallel, when the thread is pulled in the longitudinal direction, the buffer thread as a buffer thread receives most of the pulling force, and the other hard filament receives less pulling force, so the thread may break. , it is not stretched too long.

In a preferred embodiment, the invention is further configured as follows. In step 1, the method for obtaining the calculated value of the elastic recovery rate is to cut the selected buffer core yarn into multiple segments of equal length, use some of the segments as samples, and measure the rated length in the range of 100-500 mm. Arbitrarily specify one length as the length, take this length as the original length L0, pull the sample using a tensioning machine, make the pulling distance of each sample the same, and make the total length of the sample after being pulled Li. , release the tension on the sample, measure the entire length when the sample is in a stable state without deformation, set this length as Lii, and finally calculate the three numbers L0, Li, Lii. The method is to calculate the elastic recovery rate and select the cushioning core thread.

By adopting the above technical solution, it is possible to obtain an accurate value of the elastic recovery rate, thereby obtaining a preferable cushioning core yarn.

In summary, the present invention includes at least one of the following beneficial technical effects.
1. By selecting a buffer core yarn that meets certain requirements and providing buffer protection to the hard filament, we solve the problem that the hard filament does not have recovery performance or is easily broken when stretched. It also controls the occurrence of the problem of the core yarn being exposed.
2. Provide a basis for the selection of the buffer core yarn by a rational formula, thereby selecting the appropriate buffer core yarn more accurately.

FIG. 2 is a structural schematic diagram of Example 1. FIG. 2 is a block diagram of the flow of Example 1. FIG. FIG. 2 is a structural schematic diagram of Example 2.

Hereinafter, the present invention will be explained in more detail in conjunction with the drawings.

(Example 1)
As shown in Figure 1, the multicore core yarn structure that improves the stability of the core yarn coating includes a core yarn and a covering yarn 1, and there are at least two core yarns, and the covering yarn 1 covers the outside of the core yarn. do.

The covered yarn 1 is preferably short fibers, and a plurality of short fibers are assembled on the surface layer of the core yarn to form a multifilamentary core yarn. The short fibers include one or more of polyethylene short fibers, aramid short fibers, polyester, nylon, viscose, Tencel, modal, polypropylene, carton, and acrylic fibers. The length of the short fibers is controlled to be 20 mm to 75 mm, and the thickness of the short fibers is controlled to be 0.8D to 3.5D.

At least one of the plurality of core yarns uses a hard filament 2, and at least one of the other core yarns uses a buffer core yarn 3 with a break elongation of less than 50% and an elastic recovery rate of 10% to 30%. The hard filament 2 and the buffer core yarn 3 are wound around each other.

However, the hard filament 2 may be one of metallic yarn and mineral fiber, and mineral fiber includes glass fiber, basalt fiber, and the like. The hard filament 2 is preferably a hard filament that has been subjected to tension, vibration, and winding treatments, and the amount of deformation of the fabric produced after the hard filament 2 is pretreated is significantly reduced.

However, the elastic recovery rate is obtained by the formula RLII=ΔL/Li×100,
In the formula, ΔL=Li−Lii,
RLII represents the recovery status after the buffer core yarn 3 has been stretched as a percentage,
Li is the entire length of the buffer core yarn 3 after stretching, the unit is mm,
Lii is the entire length when the stretched buffer core thread 3 returns to the fixed state after being released, and the unit is mm.

According to the above formula, it is possible to obtain an accurate value of the elastic recovery rate, thereby obtaining a preferable and appropriate cushioning core yarn 3.

As shown in FIG. 2, the process for making a multifilamentary core yarn structure that improves the stability of the core yarn coating includes the following steps 1 to 3.

In the step 1 of selecting materials, one of metallic yarn and mineral fiber is selected for the hard filament 2, and for the buffer core thread 3, a material having a breaking elongation rate of less than 50% and an elastic recovery rate of 10% to 30% is selected. % fibers and the elastic recovery rate value can be calculated by RLII=ΔL/Li×100, where ΔL=Li−Lii.

The method for obtaining the calculated value of the elastic recovery rate is as follows. The selected buffer core yarn (3) is cut into a plurality of segments of equal length, several segments are used as samples, and the test is repeated 3-5 times. When selecting different raw materials, it is better that the cutting lengths of the different raw materials match. Arbitrarily designate one as the rated length in the range of 100-500 mm, use this length as the original length L0, pull the sample using a tensioning machine, make the pulling distance of each sample the same, and Set the total length of the subsequent sample to Li, release the tension on the sample, measure the overall length when the sample is in a stable state without deformation, set this length to Lii, and finally Calculate the elastic recovery rate using these numbers and select the cushioning core yarn.

In step 2 of pre-treating the core yarn material, the pre-treatment method is to subject the hard filament 2 to tension, vibration and winding treatments. The tensioning process is a drawing and pulling process in which the hard filament 2 is passed through a tension roller at least once using a feed roller. Vibration treatment refers to, in the process of pulling and transporting the hard filament 2, fixing both ends of the hard filament 2 of one segment therein and shaking the hard filament 2 up and down manually or with a device having a swinging arm. This is a process of vibrating. When rocking, the hard filament corresponds to swinging up and down, and some deformation will occur in the hard filament, which will cause the amount of deformation to occur earlier, and the amount of deformation of the glove products manufactured after that will decrease. Decrease. The winding process is a process in which the hard filament 2 is wound at least once before being double twisted with the buffer core yarn 3 so as to improve the deformation adaptability of the hard filament 2. The rigid filament has already experienced some deformation, which can reduce the problem of excessive deformation due to stretching too long during subsequent use, thereby exposing the core yarn. Solve.

In step 3 of double twisting, the hard filament 2 and the buffer core yarn 3 are wound around each other in the Z direction or the S direction using a double twister to obtain a core yarn.

In the covering step 4, the covering yarn and the core yarn are manufactured into a multi-core yarn by a core yarn coating process. However, ring spinning, vortex spinning or friction spinning can be used to obtain coated yarns of short fibers.

(Example 2)
Unlike Example 1, as shown in FIG. 3, the hard filaments 2 and the buffer core yarn 3 are arranged in parallel. A core yarn can be obtained by arranging the hard filament 2 and the buffer core yarn 3 in parallel using a thread doubling machine. When the core threads arranged in parallel are pulled in the longitudinal direction, the buffer core thread as a buffer thread receives most of the pulling force, and the other hard filament receives less pulling force, so the entire core thread may break. However, it is not stretched too long and the structure is stable.

All examples of this specific embodiment are preferred examples of the present invention, and do not limit the protection scope of the present invention, and therefore equivalent equivalents made according to the structure, shape, and principle of the present invention. Any changes should fall within the protection scope of the present invention.

1...Coated yarn, 2...Hard filament, 3...Buffer core yarn.

Claims (7)

The core yarn includes a core yarn and a covering yarn (1), the core yarn has at least two core yarns, and the covering yarn (1) has a multifilamentary core yarn structure that improves the stability of the core yarn coating that covers the outside of the core yarn. At least one of the core yarns is a hard filament (2), and at least one of the core yarns is a buffer core yarn (with a break elongation rate of less than 50% and an elastic recovery rate of 10% to 30%). 3), the buffer core thread (3) is polyester or nylon, and the hard filament thread (2) and buffer core thread (3) are wound around each other or arranged in parallel;
The covered yarn (1) is a short fiber, and a plurality of the short fibers are assembled on the surface layer of the core yarn to form a multifilamentary core yarn, and the short fibers are polyethylene short fibers, aramid short fibers, polyester, One or more types of nylon, viscose, Tencel, modal, polypropylene, cotton, and acrylic fibers,
A multicore core yarn structure that improves the stability of the core yarn coating. The elastic recovery rate is expressed by the formula
In the formula, ΔL=Li−Lii, RLII represents the recovery state of the buffer core yarn (3) after stretching as a percentage, and Li represents the recovery state of the buffer core yarn after stretching. is the total length, and Lii is the total length after the stretched buffer core thread (3) returns to the fixed state after being released;
The multifilamentary core yarn structure for improving the stability of the core yarn coating according to claim 1. The length of the short fibers is 20 mm to 75 mm, and the thickness of the short fibers is 0.8D to 3.5D.
The multifilamentary core yarn structure for improving the stability of the core yarn coating according to claim 1 . A process for producing a multifilamentary core yarn structure that improves the stability of the core yarn coating according to claims 1 to 3, comprising:
In the step 1 of selecting materials, one of metallic yarn and mineral fiber is selected for the hard filament (2), and a material with a break elongation rate of less than 50% and elastic recovery is selected for the buffer core yarn (3). Select polyester or nylon with a modulus of 10% to 30%, and the elastic recovery rate value can be calculated by RLII=ΔL/Li×100, where ΔL=Li−Lii and ,
step 2 of double twisting, the hard filament (2) and the buffer core yarn (3) are wound around each other in the Z direction or the S direction using a double twister or a wrapping machine to obtain a core yarn; ,
coating step 3, comprising the step of manufacturing the covered yarn and the core yarn into a multi-core yarn by a core yarn coating process;
The above RLII represents the recovery state of the buffer core yarn (3) after being stretched as a percentage, Li is the entire length of the buffer core yarn after being stretched, and Li is the length of the stretched buffer core yarn. is the overall length after the thread (3) returns to the fixed state after being released;
A process for producing a multicore core yarn structure that improves the stability of the core yarn coating. In step 1, the method for obtaining the calculated value of the elastic recovery rate is to cut the selected buffer core thread (3) into a plurality of segments of equal length, use some of the segments as samples, and cut the selected buffer core thread (3) into segments in the range of 100 to 500 mm. , arbitrarily specify one as the rated length, take this length as the original length L0, pull the sample using a tensioning machine, make the pulling distance of each sample the same, and calculate the total length of the sample after being pulled. Set Li, release the tension on the sample, measure the entire length when the sample is in a stable state without deformation, set this length to Lii, and finally set L0, Li, Lii. Calculate the elastic recovery rate using three numerical values and select the cushioning core thread (3).
The process for producing a multifilamentary core yarn according to claim 4 . In step 1 of selecting materials, the hard filament can be selected from either metallic yarn or mineral fiber, and the cushioning core yarn can have an elongation at break of less than 50% and an elastic recovery rate of 10% or more. Selecting 30% polyester or nylon, the elastic recovery rate value can be calculated by RLII=ΔL/Li×100, where ΔL=Li−Lii;
step 2 of double twisting, a step of arranging the hard filament (2) and the buffer core yarn (3) in parallel using a yarn doubling machine to obtain a core yarn;
coating step 3, comprising the step of manufacturing the covered yarn and the core yarn into a multicore core yarn by a core yarn coating process;
The above RLII represents the recovery state of the buffer core yarn (3) after being stretched as a percentage, Li is the entire length of the buffer core yarn after being stretched, and Li is the length of the stretched buffer core yarn. is the overall length after the thread (3) returns to the fixed state after being released;
A process for producing a multicore core yarn structure that improves the stability of the core yarn coating. In step 1, the method for obtaining the calculated value of the elastic recovery rate is to cut the selected buffer core thread (3) into a plurality of segments of equal length, use some of the segments as samples, and cut the selected buffer core thread (3) into segments in the range of 100 to 500 mm. , arbitrarily specify one as the rated length, take this length as the original length L0, pull the sample using a tensioning machine, make the pulling distance of each sample the same, and calculate the total length of the sample after being pulled. Set Li, release the tension on the sample, measure the entire length when the sample is in a stable state without deformation, set this length to Lii, and finally set L0, Li, Lii. Calculate the elastic recovery rate using three numerical values and select the cushioning core thread (3).
The process for producing a multifilamentary core yarn according to claim 6 .