CN114908451B

CN114908451B - Spinning method of staple yarn core ring spindle core spun yarn based on drawing process

Info

Publication number: CN114908451B
Application number: CN202210168893.5A
Authority: CN
Inventors: 陈志华; 张曙光; 杨继烈; 赵丽红; 李辉
Original assignee: Jiangsu Dingxin Printing & Dyeing Co ltd; Nantong Textile Vocational Technology College
Current assignee: Jiangsu Dingxin Printing & Dyeing Co ltd; Nantong Textile Vocational Technology College
Priority date: 2022-02-23
Filing date: 2022-02-23
Publication date: 2024-03-22
Anticipated expiration: 2042-02-23
Also published as: CN114908451A

Abstract

The invention discloses a spinning method of a staple yarn core ring-spun core yarn based on a drawing process, which comprises the following steps: (1) carding process: spinning the short fiber A serving as a yarn core and the short fiber B serving as a yarn sheath into a raw strip A and a raw strip B through a carding process respectively; (2) and (3) a first drawing process: spinning the raw strips A and B into semi-finished strips A and B through a first drawing process; (3) two drawing processes: spinning the A semi-finished strip and the B semi-finished strip into a core-spun finished strip through a two-pass drawing process; the rear part of a rear drafting roller of the two-channel drawing frame is additionally provided with a three-shaped feeding horn mouth; (4) the core-spun cooked strip is sequentially subjected to a roving process, a spinning process and a winding process to prepare the staple fiber yarn core ring spindle core-spun yarn. The spinning method has the advantages of shorter process flow, simpler structural transformation, and natural flattening of the upper, middle and lower three layers of fed fiber strips, thus reducing the drafting force to ensure normal drafting and further obtaining better core-spun effect.

Description

Spinning method of staple yarn core ring spindle core spun yarn based on drawing process

Technical Field

The invention belongs to the technical field of ring spun core yarn spinning, and particularly relates to a spinning method of a staple yarn core ring spun core yarn based on a drawing process.

Background

The core spun yarn is a blended yarn with a sheath-core structure, which consists of a yarn core and a yarn sheath, wherein the yarn sheath adopts short fibers, and the yarn core has two forms: short fibers are also used, and filaments are used.

Ring spun core yarn spinning technology using filaments as yarn cores is well established, and the basic process is as follows: feeding the short fiber roving serving as yarn sheath from a back roller of a spinning frame, aligning filaments serving as yarn cores with the center of the output short fiber strand, feeding the filament into a jaw of a front roller from the point, outputting the filament together with the short fiber strand, and twisting the filament into core-spun yarn.

Ring spun yarn spinning techniques using staple fibers as the yarn core are of the following types:

1. core spun yarn spinning technology based on spinning process.

The A short fiber serving as a yarn core is spun into an A short fiber spun yarn in advance, the B short fiber roving serving as a yarn sheath is fed from a back roller of a spinning machine, the A short fiber spun yarn is aligned with the center of the B short fiber strand output, and is fed into a jaw of a front roller from the point, and is output together with the B short fiber strand, and then twisted into the core spun yarn.

The method has the following defects: (1) The yarn core short fiber is spun into spun yarn in advance, so that the process flow and the production cost are increased; (2) It is difficult to spin fine core spun yarns because the linear density of spun yarn spun from staple fibers is difficult to meet the requirements of fine core spun yarns.

2. A core spun yarn spinning technique based on a roving process, comprising:

(1) The document 1 discloses an application of a novel spinning technology on a roving frame, which is characterized in that a cooked A short fiber strip serving as a yarn core and a cooked B short fiber strip serving as a yarn sheath are fed into the roving frame at a certain distance, two kinds of strands are output from a front roller of the roving frame, and are converged into a core-spun roving through a special sliver guide channel, which is equivalent to siro spinning on the roving frame.

The method has the following defects: the structure improvement is complicated, and the feeding horn mouth and the collector are changed into double pairs of double horn mouths which are arranged in parallel on the basis of the original drafting device of the roving frame; it is also necessary to install a special guide bar channel device between the front roller of the roving frame and the top hole of the flyer, and the guide bar channel device comprises two specifications of long and short so as to adapt to the requirements of front and rear flyers.

(2) Document 2 discloses a polyester-cotton knitting yarn of a roving core-spun yarn, which is obtained by spinning polyester staple fibers serving as a yarn core into polyester roving a, feeding the polyester roving a and cotton sliver B serving as a yarn cover into a rear roller of a roving frame in an up-down overlapping manner, spinning the polyester staple fibers into core-spun roving, and spinning the core-spun yarn into core-spun yarn by a spinning frame.

The method has the following defects: the yarn core staple fibers need to be spun into the roving in advance, which increases the process flow and the production cost.

(3) Document 3 discloses a spun sheath-core structural yarn based on a roving process, which is characterized in that cotton staple fibers serving as a yarn core are spun into cotton roving, then the cotton roving and cotton sliver serving as a yarn sheath are fed into a roving frame in an up-down overlapping mode, the roving is twisted and spun into core-spun roving, and the core-spun yarn is spun into core-spun yarn by the spinning frame.

The method has the following defects: the yarn core staple fibers also need to be spun into the roving in advance, which increases the process flow and the production cost.

3. Core spun yarn spinning techniques based on drawing processes.

Document 4 discloses a drawing frame and a method for processing core spun yarn, wherein three upper round holes are respectively fed into three upper layer strips, three lower round holes are respectively fed into three lower layer strips, and a middle hole is fed into the core spun yarn.

The method has the following defects: the strip-to-strip gap is easy to generate larger gaps, so that the thickness is uneven, the drawing is not facilitated, the cladding core is not facilitated, and finally the core cladding effect is poor.

Document 1: shen Hui, "application of novel spinning technology to roving frame", stage 3 of textile equipment 2017, pages 59-62.

Document 2: zhang Gongmei, "research and development of roving core-spun yarn and cotton-polyester knitting yarn", 2017, 8 th edition, pages 24-26 of the knitting industry.

Document 3: gu Yinhua, "study of factors affecting the sheath-core structure of a spun yarn by the roving process", and "cotton spinning technology", 48 th, 11 th, 14 th to 18 th pages of the roll 11 in 2020.

Document 4: chinese patent document CN108442006a, publication date 2018, month 8, 24.

Disclosure of Invention

The invention aims to solve the problems and provide the spinning method of the spun yarn core-spun yarn based on the drawing process, which has the advantages of shorter process flow, simpler structural transformation and better core-spun effect.

The technical scheme for realizing the aim of the invention is as follows: a spinning method of a spun yarn core ring spun yarn based on a drawing process, comprising:

(1) carding process: spinning the short fiber A serving as a yarn core and the short fiber B serving as a yarn sheath into a raw strip A and a raw strip B through a carding process respectively;

(2) and (3) a first drawing process: spinning the raw strips A and B into semi-finished strips A and B through a first drawing process;

(3) two drawing processes: spinning the A semi-finished strip and the B semi-finished strip into a core-spun finished strip through a two-pass drawing process;

(4) and (3) sequentially performing a roving process, a spinning process and a winding process on the core-spun cooked strip obtained in the step (3) to obtain the staple fiber yarn core ring spindle core-spun yarn.

In the step (1), the short fibers a are natural fibers or synthetic fibers, preferably synthetic fibers, and more preferably polyester short fibers.

In the step (1), the B short fibers are natural fibers or chemical fibers, preferably natural fibers, and more preferably cotton short fibers.

In the step (1), the dry basis weight of the A raw strips is less than the dry basis weight of the B raw strips, and preferably, the dry basis weight of the A raw strips is 10g/5 m-15 g/5m; the dry basis weight of the B raw strips is 15g/5 m-20 g/5m.

In the step (1), the carding process is a conventional process in the art, and will not be described herein.

In the step (3), the blending ratio of the A semi-finished product strip to the B semi-finished product strip is 5:95-30:70.

In the step (3), the number of the fed roots and the feeding dry weight of the A semi-cooked strips and the B semi-cooked strips satisfy the following formula: (number of fed half-cooked strips x dry basis of fed half-cooked strips) to (number of fed half-cooked strips x dry basis of fed half-cooked strips B) =blending ratio of the half-cooked strips a and the half-cooked strips B.

In the step (3), the feeding dry weight of the A semi-cooked strips is 8g/5 m-12 g/5m.

In the step (3), the feeding dry weight of the B semi-cooked strips is 15g/5 m-20 g/5m.

In the step (3), structural transformation of the two drawing procedures and drawing process parameters are key factors for obtaining a good core-spun effect.

The structural transformation is that a three-shaped feeding horn mouth shown in figure 1 is additionally arranged at the rear part of a rear drafting roller of a two-channel drawing frame.

The horn mouth in the shape of the Chinese character 'san' is provided with a middle groove for feeding the A semi-cooked strips and an upper groove and a lower groove for feeding the B semi-cooked strips; the widths of the upper groove and the lower groove are the same and are larger than the width of the middle groove; the heights of the middle groove, the upper groove and the lower groove are the same; the distance between the middle groove and the upper groove is equal to the distance between the middle groove and the lower groove.

Because the three-layer overlapped feeding mode is adopted, the drafting force can be increased, and reasonable drafting technological parameters are required to be selected to adapt to the requirements of the three-layer overlapped feeding, and the method specifically comprises the following steps: (1) The gauge of the rear area roller is required to be properly enlarged, in particular to be enlarged by 5-15 mm on the basis of the gauge of the conventional rear area roller. (2) The back zone draft multiple is required to be properly increased, the back zone draft multiple of the conventional two-channel drawing is 1.1-1.2 times, and the back zone draft multiple adopting a three-layer superposition feeding mode is required to be increased to 1.3-1.5 times.

In the step (3), the dry weight of the core-spun cooked strip is 18g/5 m-25 g/5m.

In the step (4), the roving process, the spinning process and the winding process are all conventional processes in the art, and are not described herein.

The invention has the positive effects that:

(1) The spinning method has the advantages of short process flow, simple structural transformation and good core wrapping effect.

(2) The three-shaped horn mouth can naturally flatten the whisker fed by the upper layer, the middle layer and the lower layer, so that the drafting force can be reduced to ensure normal drafting, and a better core wrapping effect is obtained.

Drawings

FIG. 1 is a schematic diagram of the structure of a "tri-shaped" feed horn of the present invention.

FIG. 2 is a photograph of a cross-section of a spun yarn core ring covering yarn prepared in example 1.

FIG. 3 is a photograph of a cross-section of a spun yarn core ring covering yarn made in example 2.

FIG. 4 is a photograph of a cross-section of a spun yarn core ring covering yarn prepared in comparative example 1.

Fig. 5 is a photograph of a cross-section of a spun yarn core ring covering yarn prepared in comparative example 2.

Detailed Description

Example 1

The spinning method of the staple fiber yarn core ring spun yarn based on the drawing process of the embodiment comprises the following steps:

(1) and (3) carding cotton.

And (3) preparing the polyester staple fiber serving as the yarn core (namely the A staple fiber) into a polyester raw strip according to a conventional cotton opening and picking process. Cotton short fibers (namely the short fibers B) used as yarn skins are manufactured into cotton raw strips according to a conventional cotton opening and picking and carding process.

In this example, the dry basis weight of the polyester raw sliver was 12g/5m, and the dry basis weight of the cotton raw sliver was 15g/5m.

In order to observe the core-spun effect under a microscope, polyester staple fibers and cotton staple fibers need to be dyed into different colors in advance.

(2) And (5) a first drawing process.

The polyester raw strips are made into polyester semi-finished strips through a first drawing process, and the cotton raw strips are made into cotton semi-finished strips through a first drawing process.

The main technological parameters of the first drawing process are shown in table 1.

TABLE 1

	Polyester head drawing	Drawing for cotton head
			Number of feeds	8	8
Feeding dry basis	12g/5m	15g/5m
			Total draft multiple	9.6	8.0
Quantitative of the discharged stem	10g/5m	15g/5m

(3) And (3) a second drawing process.

The rear part of the rear drafting roller of the two-channel drawing frame is additionally provided with a three-shaped feeding horn mouth 1 shown in figure 1.

The horn mouth 1 is provided with a middle groove 11 for feeding polyester semi-finished product strips, and an upper groove 12 and a lower groove 13 for feeding cotton semi-finished product strips.

The widths of the upper groove 12 and the lower groove 13 are the same and are both larger than the width of the middle groove 11; the middle groove 11, the upper groove 12 and the lower groove 13 have the same height; the middle groove 11 is equidistant from the upper groove 12 and the lower groove 13.

1 polyester semi-finished strip is fed from a middle groove 11, 3 cotton semi-finished strips are fed from an upper groove 12, 3 cotton semi-finished strips are fed from a lower groove 13, and the core-spun finished strips are spun through a two-step drawing process.

The main technological parameters of the two-step drawing process are shown in Table 2.

TABLE 2

Feeding root number of polyester semi-finished product strips	1
		Feeding dry ration for polyester semi-cooked stripe	10g/5m
The number of the cotton semi-cooked strips fed	3+3
		Feeding dry ration for cotton semi-cooked strips	15g/5m
Rear area roller gauge	30mm [ 10mm larger ]
		Back zone draft multiple	1.35
Quantification of core-spun cooked stem	20g/5m
		Total draft multiple	5

In table 2, the total draft ratio calculation formula is as follows: total draft = (cotton half-cooked sliver feed root number x cotton half-cooked sliver feed dry basis weight + polyester half-cooked sliver feed root number x polyester half-cooked sliver feed dry basis weight)/core-spun cooked sliver dry basis weight.

(4) Finally, the spun yarn core ring spindle core spun yarn is prepared through the roving procedure, the spinning procedure and the spooling procedure.

Wherein the total draft multiple of the roving procedure is 8.333, the roving twist factor is 85, and the dry weight of the roving is 4.8g/10m.

The total draft of the spinning process is 21.538, and the twist factor of the spun yarn is 380.

The cross-sectional photo of the spun yarn core ring spindle core spun yarn prepared in the embodiment under a microscope is shown in fig. 2; in the figure, the outermost layer is wool for slice filling, the innermost layer is polyester staple fiber yarn core, and the middle layer is cotton staple fiber yarn skin.

As can be seen from fig. 2: the spun yarn core ring spindle core spun yarn of the embodiment has good core spun effect.

Example 2

The spinning method of the staple yarn core ring spun core yarn based on the drawing process of example 2 is basically the same as example 1, except for the drawing process parameters.

A photograph of a cross section of the spun yarn core ring spun yarn prepared in example 2 under a microscope is shown in FIG. 3.

As can be seen from fig. 3: example 2 the spun yarn core ring spun yarn has a core-spun effect which is not as good as that of example 1.

Comparative examples 1 to 2

The spinning method of the staple fiber yarn core ring spun yarn based on the drawing process of each comparative example is different from that of example 1 in that: the two-step drawing process in step (3) adopts the feeding device of document 4, the drawing process parameters are shown in Table 3, and the cross-sectional photographs are shown in FIGS. 4 and 5, respectively.

TABLE 3 Table 3

	Rear area roller gauge	Back zone draft multiple
			Example 1	30mm [ 10mm larger ]	1.35
Example 2	20mm [ conventional ]	1.15 [ conventional ]
			Comparative example 1	30mm [ 10mm larger ]	1.35
Comparative example 2	20mm [ conventional ]	1.15 [ conventional ]

As can be seen from fig. 4 and 5: the core-spun effect of the spun yarn core ring core-spun yarn of comparative example 1 and comparative example 2 was not ideal. Wherein: the yarn core of comparative example 1 could not be completely covered, but the yarn core fiber was dispersed and the performance of the core spun yarn could not be fully exhibited although it could be covered in comparative example 2.

Claims

1. A spinning method of a spun yarn core ring spun yarn based on a drawing process, comprising:

the second drawing process comprises the step of adding a three-shaped feeding horn mouth (1) at the rear part of a rear drafting roller of a second drawing frame; the feeding horn mouth (1) is provided with a middle groove (11) for feeding the A semi-cooked strips, and an upper groove (12) and a lower groove (13) for feeding the B semi-cooked strips; the widths of the upper groove (12) and the lower groove (13) are the same and are larger than the width of the middle groove (11); the heights of the middle groove (11), the upper groove (12) and the lower groove (13) are the same; the distance between the middle groove (11) and the upper groove (12) and the distance between the middle groove and the lower groove (13) are equal;

2. The spinning method of the spun yarn core ring spun yarn based on the drawing process as claimed in claim 1, wherein: in the step (3), the gauge of the rear-area roller in the two drawing steps is 25-35 mm; the draft of the back zone is 1.3-1.5 times.

3. Spinning method of spun yarn based on drawing process according to claim 1 or 2, characterized in that: in the step (1), the short fibers A are synthetic fibers; the short fibers B are natural fibers; the dry basis weight of the A raw strips is less than that of the B raw strips.

4. A method of spinning a spun yarn of a staple yarn core ring spun yarn based on a drawing process as claimed in claim 3, characterized in that: the dry weight of the raw strips A is 10g/5 m-15 g/5m; the dry basis weight of the B raw strips is 15g/5 m-20 g/5m.

5. Spinning method of spun yarn based on drawing process according to claim 1 or 2, characterized in that: in the step (3), the blending ratio of the A semi-finished product strip to the B semi-finished product strip is 5:95-30:70.

6. The spinning method of the spun yarn core ring spun yarn based on the drawing process as claimed in claim 5, wherein: the feeding root number and the feeding dry ration of the A half-cooked strips and the B half-cooked strips meet the following formula: (number of fed half-cooked strips x dry basis of fed half-cooked strips) to (number of fed half-cooked strips x dry basis of fed half-cooked strips B) =blending ratio of the half-cooked strips a and the half-cooked strips B.

7. The spinning method of the spun yarn core ring spun yarn based on the drawing process as claimed in claim 6, wherein: the feeding dry ration of the A semi-cooked strips is 8g/5 m-12 g/5m; the feeding dry ration of the B semi-cooked strips is 15g/5 m-20 g/5m.

8. Spinning method of spun yarn based on drawing process according to claim 1 or 2, characterized in that: in the step (3), the dry weight of the core-spun cooked strip is 18g/5 m-25 g/5m.