CN106917174A - A kind of Seluofle spins pure cotton stretch yarn and its preparation and application - Google Patents

Abstract

The invention relates to a sirofil spun pure cotton elastic yarn and its preparation and application. The pure cotton elastic yarn is covered with rovings forming a covering layer and spun yarns forming a core layer by a sirofil spinning process. structure. The spun yarn and the roving are twisted and spun in the same direction on the Sirofill spinning machine, and then finished to obtain the Sirofill pure cotton elastic yarn. In the present invention, the cotton fiber which originally does not have elasticity is made to have natural elasticity after certain processing procedures and treatments, and replaces the spandex elastic core-spun yarn used in traditional elastic denim fabrics, thereby avoiding the use of elastic yarns to cause exposed cores, difficulty in weaving, and wide Wide and difficult to control and other technical problems, and help to enhance the stiffness of elastic denim fabrics without reducing the fabric feel, and provide a new yarn raw material for conventional medium and low elastic denim fabrics.

Description

A kind of sirofil spun pure cotton elastic yarn and its preparation and application

technical field

The invention belongs to the field of elastic yarn and its preparation and application, in particular to a sirofield pure cotton elastic yarn and its preparation and application.

Background technique

Elastic denim fabrics are comfortable to wear, compact and stylish, and stretchable freely. They occupy a large proportion in denim fabrics, and their elastic range is generally 10-20%. However, with the continuous improvement of people's material living standards, people have higher and higher requirements for elastic denim fabrics, not only requiring comfortable wearing, but also requiring them to be beautiful and environmentally friendly.

At present, elastic yarns used in elastic denim are generally spun from natural fibers and elastic fibers in a core-spun or covered manner, such as core-spun floral twist elastic yarns, elastic double-filament core-spun yarns, and the like. Chinese patent (publication number CN106048810A) "a core-spun flower twist elastic yarn and its preparation method" uses short fibers as the covering yarn, and takes PBT or nylon DTY filament as the core to form the core-spun flower twist. However, as far as the elastic source of elastic yarn is concerned, its elastic force mainly comes from PBT elastic yarn. Due to the chemical fiber material used in PBT elastic yarn, its hygroscopicity is poor, which affects the comfort of wearing. Chinese patent (publication number CN104060356A) "A polyester-spandex double core-spun yarn and its fabric" uses composite polyester filament and spandex as the core, and natural fiber or chemical fiber as the covering fiber, in order to achieve the elasticity of spandex and the excellent quality of polyester. The combination of recovery, but because the core yarn part uses spandex yarn, it does not change the disadvantages of the elastic yarn in the spinning, weaving and even wearing process - exposed core, difficult to control the weaving width, difficult to degrade, pollute the environment, etc. . Chinese Utility Model Patent (CN201620512458.X) "A Siro Compact Spinning Composite Double Core Yarn" uses two filaments of polyester/nylon and spandex as the core and cotton fiber as the cladding layer to produce a composite double core spun yarn. Chinese invention patent (CN201610446618.X.) "Siro core-spun yarn and its production process" is made by twisting two rovings through the Siro spinning process. The rovings are untwisted glass filaments/metal wires and other rigid fibers. A hard core and untwisted natural/chemical fibers form the sheath to avoid breakage and exposure of the core yarn. Chinese invention patent (CN201610640516.1) "A Super Elastic Warm Core Spun Yarn" uses the mixed twisted yarn of spandex filament and nylon yarn as the core layer, and the mixed twisted fiber layer of cashmere and tencel fiber as the winding layer. However, when elastic core-spun yarns such as spandex are used to impart elasticity to the fabric, the elastic residual rate and shrinkage rate of the fabric with better elasticity will also increase, and the weather resistance and temperature resistance of spandex fiber are poor, and the fabric can be worn for a long time or even for a long time. Storage will lose elasticity, resulting in loose deformation and other phenomena. To sum up, although the presence of elastic yarn endows the yarn with better elasticity, it also has negative effects on weaving and wearing - exposed core, large weft shrinkage, difficult control of width, poor moisture absorption, poor comfort, etc. .

Natural fibers, such as cotton fibers, have the characteristics of moisture absorption, breathability, softness, and anti-sensitivity, and have unique advantages compared to elastic silk. As far as the core-spun yarn of non-elastic yarn/fiber is concerned, the Chinese invention patent (CN201610859864.8) "A Yak Cashmere Wrapped Core-spun Yarn and Its Production Method" uses filament or staple spun yarn as the core layer and weak twist Yak velvet strips are the covering layer; Chinese invention patent (CN201610641004.7) "a composite core-spun yarn" uses silver-plated nylon filament/bamboo fiber wrapping yarn as the core layer, and the covering layer is tencel and cashmere fiber . These structures achieve a corespun yarn structure that fulfills certain functions, but does not impart elasticity to the yarn. In addition, the document "Production and Development of Pure Cotton Strong Twisted Warp and Weft Elastic Fabric" (Qi Yinfang, Li Qingquan, Zhang Haixia, Tianjin Textile Science and Technology, 2009, 4: 22-24) proposes to use ordinary pure cotton strong twisted yarn to endow it with mercerizing finishing. Fabric elasticity, such fabrics have greatly reduced hand feeling and wearing comfort due to too high single yarn twist.

Obviously, the core-spun yarn used in the existing elastic denim fabrics often uses elastic yarn such as spandex as the core yarn, and pure cotton or cotton blended yarn as the covering yarn. It is difficult for the fabric to have both good elasticity and good elasticity. Dimensional stability, etc.; the existing elastic fabrics based on pure cotton natural fibers only rely on strong twisting of spun yarns, which imparts a certain degree of elasticity while reducing the style of the fabric. Now there is a lack of a yarn structure that can replace synthetic elastic yarns such as spandex and make denim fabrics have certain elasticity, thereby overcoming the various disadvantages of using elastic yarns, while maintaining the style, quality and feel performance of denim fabrics.

Contents of the invention

The technical problem to be solved by the present invention is to provide a kind of sirofil spun pure cotton elastic yarn and its preparation and application, which makes the cotton fiber which does not have elasticity naturally elastic through certain processing procedures and treatments, replacing Traditional elastic denim fabrics use spandex elastic core-spun yarn, so as to avoid technical problems such as exposed core, difficult to weave, and difficult to control the width caused by the use of elastic yarn, and help to enhance the crispness of elastic denim fabrics without reducing the fabric feel. Low and medium stretch denim fabrics provide a new yarn raw material.

A kind of sirofill spun pure cotton elastic yarn of the present invention, described pure cotton elastic yarn comprises cladding layer and core layer, and cladding layer is made of a pure cotton roving and core layer is made of a pure cotton spun yarn with siro Phil spinning process spinning forms.

The pure cotton elastic yarn includes a covering layer formed by a pure cotton roving, a core layer formed by a pure cotton spun yarn, and a cotton covered structure core-spun yarn is formed by the Sirofill spinning process.

The roving is weakly twisted cotton sliver or fiber net, and the spun yarn is conventionally twisted cotton spun yarn (120-300 twists/m).

The covering structure core-spun yarn is characterized in that the core yarn has strong twist and the cladding layer fiber web has moderate twist.

The fiber net is: the roving is a cotton roving sliver, which is wrapped in the outer layer of the spun yarn with a fiber net through the Sirofield spinning process, so that the produced cotton yarn and fabric have good hand feeling properties.

The spun yarn is a conventionally twisted cotton spun yarn, and the twist depends to a certain extent on the yarn elasticity required by the end use. After being further twisted by the Sirofill spinning process, it is in the core layer of the covered structural yarn, showing a strong twist effect.

The twist of the core-spun yarn with the all-cotton covering structure is 500-800 twists/m, and the twist of the core layer raw cotton spun yarn at this time increases to 600-1000 twists/m.

A kind of preparation method of Sirofill spinning pure cotton elastic yarn of the present invention, comprises:

Spun yarn with a fineness of 40 British counts and an initial twist of 120-300 twists/m and a roving with a fineness of 14 British counts and an initial twist of 100 twists/meter are twisted and spun in the same direction on the Sirofill spinning frame to form a coating twist Moderate and strong core twisted covered structural yarn, and then loosened and mercerized to obtain Sirofill spun pure cotton elastic yarn.

The spun yarn is formed by adding conventional twist spinning (120-300 twists/meter) to the roving sliver on the ring spinning frame, and is used as the feed yarn of the Sirofield spinning process to form the core of the pure cotton elastic yarn Floor.

The spun yarn is ring-spun cotton yarn with count 40; the roving is ordinary cotton staple fiber with count 14.

The staple fibers consist of cotton fibers.

The finishing is mercerizing.

The mercerizing treatment is: pine-type mercerizing treatment, specifically: the concentration of the lye solution to be treated is 250-280g/L, tension-free treatment is adopted, and the treatment time is 50-90s, and then dried by alkali-removing treatment.

The loose-type mercerizing finishing process solves the twist shrinkage and untwisting of the prepared core-spun strong-twisted yarn, and makes the Sirofil spun cotton core-spun yarn form permanent shrinkage curls.

The core-spun strong-twisted yarn is directly treated by loose mercerizing, and finally the cotton elastic yarn for elastic denim is obtained.

When the roving of the present invention wraps the core layer spun yarn, the core layer spun yarn is twisted in the same direction, and the core layer spun yarn forms a strong twist structure.

The application of a kind of sirofill spinning pure cotton elastic yarn of the present invention, pure cotton elastic yarn is used for the weaving raw material of elastic denim.

The spinning process of the present invention is Sirofill spinning, the two fed strands are roving and spun yarn respectively, and the twist direction of the fed roving and spun yarn is consistent, and the twisting direction of Sirofill spinning is the same as that of the spun yarn and roving. Twist in the same direction, so that the spun yarn is further twisted to form a strong twist effect, which will endow the Sirofill spun cotton core-spun yarn and fabric of the present invention with certain elasticity after subsequent finishing.

The Sirofield spinning process of pure cotton elastic yarn feeds spun yarns from pure cotton rovings spun on a ring spinning frame.

In the preparation method of Sirofill spinning pure cotton elastic yarn, the two filaments fed on the Sirofill spinning machine are spun yarn and roving respectively, and the two are fed in the same direction and twisted in the same direction spinning.

Beneficial effect

The present invention proposes a structure and preparation method of Sirofill spun cotton elastic yarn, which can not only overcome the dyeing and finishing and whitening defects of denim elasticized by spandex and other elastic yarn core-spun yarns, but also solve the problem based on spandex elastic yarn. The disadvantages such as difficult weaving, difficult width control, and curling when the core yarn is used to produce elastic denim have also changed the current technical problems of using pure cotton strong-twisted spun yarns to obtain elasticity through mercerizing and reducing fabric feel and comfort; The stretch denim fabric made of cotton stretch yarn has clear lines, comfortable to wear, crisp, greatly improved dyeability, less color difference, and the fabric elasticity will not be weakened by washing. It is a lifelong elastic and will not be polluted after being discarded. Environment, is a very good ecological environmental protection elastic yarn.

Description of drawings

Fig. 1 is a schematic diagram of the core-spun strongly twisted elastic yarn and its structure of the present invention, wherein (a) is before twisting, and (b) is after twisting.

detailed description

Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

Example 1

(1) Yarn specification

Core-spun strong twist elastic yarn: 500 twists/m, 20 lbs;

Raw materials: coated fiber mesh, cotton roving, fineness 14 lbs, twist 100 twists/m;

Core layer, ring spun cotton yarn, fineness 40 lbs, twist 120 twists/m;

(2) Production process

Please refer to FIG. 1 , the embodiment of the present invention includes: a core-spun strong-twisted elastic yarn, the covering layer is formed by the roving, and the core layer is formed by the spun yarn to form a covered structure core-spun yarn.

Both the roving and the spun yarn are pure cotton fibers, and the spun yarn is spun from the roving through a ring spinning process.

Specific steps are as follows:

(1) Preparation of spun yarn: Twisting and spinning the roving on the ring spinning frame to make spun yarn with a certain twist. The twist of the spun yarn spun in this example is 120 twists/meter;

(2) Preparation of core-spun strong twisted yarn: on the Sirofill spinning machine, the spun yarn and the roving made in step (1) are used as two strands of feeding, twisted and spun in the same direction (Z-Z), Among them, the roving is wrapped by drawing and spinning to form a core-spun yarn covering layer, and the spun yarn is further twisted to form a core-spun yarn core layer. In this example, the twist twist is 500 twists/meter;

(3) Preparation of elastic yarn: the core-spun yarn after twisting in step (2) is subjected to alkali mercerizing treatment to finally obtain core-spun elastic yarn with strong twist. In this case, the lye concentration of mercerizing treatment is 280g/L, and it adopts tension-free treatment, and the treatment time is 90s, and then it is dried by alkali-removing treatment.

After (2) twisting, the core-spun strong-twisted yarn has obvious twist shrinkage and feels hard, but the elastic recovery rate increases from 15.90% to 21.57%. After (3) mercerizing treatment, the twist shrinkage disappears and the internal stress is fully released. The yarn forms a permanent retraction curl, the hand feeling becomes soft, the elasticity is enhanced, the elastic elongation reaches 16.5% (meeting the general denim elastic requirement), and the elastic recovery rate increases from 21.57% to 26.16%.

Claims (10)

1. a kind of sirofill spinning pure cotton elastic yarn, it is characterized in that: described pure cotton elastic yarn comprises cladding layer and core layer, and cladding layer is made of a pure cotton roving and core layer is made of a pure cotton spun yarn It is spun by the sirofill spinning process. 2. a kind of Sirofill spinning pure cotton elastic yarn according to claim 1, is characterized in that: described covering layer raw material is weakly twisted cotton sliver or fiber net, and twist is 100 twists/meter; Core yarn The raw material is conventional twisted cotton spun yarn with a twist of 120-300 twists/m. 3. A kind of Sirofill spun pure cotton elastic yarn according to claim 1, characterized in that: the twist of said elastic yarn is 500-800 twists/meter. 4. a preparation method of Sirofill spinning pure cotton elastic yarn as claimed in claim 1, comprising: The spun yarn and the roving are fed as two strands on the Sirofill spinning frame, twisted and spun in the same direction, and then sorted to obtain Sirofill pure cotton elastic yarn. 5. the preparation method of a kind of Sirofill spinning pure cotton elastic yarn according to claim 4, is characterized in that: described spun yarn is made spun yarn by twisting roving spinning on spinning frame. 6. The preparation method of a kind of Sirofield pure cotton elastic yarn according to claim 4, characterized in that: the spun yarn is formed by ring spinning process; the roving is short fiber. 7. A method for preparing Sirofield pure cotton elastic yarn according to claim 6, characterized in that: the short fibers are composed of cotton fibers. 8. A method for preparing Sirofield pure cotton elastic yarn according to claim 4, characterized in that: the finishing is mercerizing. 9. The preparation method of a kind of Sirofill spinning pure cotton elastic yarn according to claim 4, characterized in that: the mercerizing treatment is: loose type mercerizing treatment, specifically: the lye concentration of the treatment is 250- 280g/L, using tension-free treatment, the treatment time is 50-90s, and then dried by alkali-removing treatment. 10. An application of Sirofill spinning pure cotton elastic yarn as claimed in claim 1, characterized in that: pure cotton elastic yarn is used for elastic denim.