CN111764030A

CN111764030A - Composite low-twist yarn towel and production method thereof

Info

Publication number: CN111764030A
Application number: CN202010459391.9A
Authority: CN
Inventors: 王红星
Original assignee: Binzhou Yaguang Home Textile Co ltd
Current assignee: Binzhou Yaguang Home Textile Co ltd
Priority date: 2020-05-26
Filing date: 2020-05-26
Publication date: 2020-10-13
Anticipated expiration: 2040-05-26
Also published as: CN111764030B

Abstract

The invention belongs to the field of textile products, and particularly provides a composite low-twist yarn towel and a production method thereof, wherein the composite low-twist yarn towel consists of terry yarns, ground warp yarns and weft yarns, wherein the ground warp yarns and the weft yarns are yarns for normal towels, the terry yarns are composite low-twist yarns, the composite low-twist yarns consist of two yarns with different thicknesses, the spun yarns are synthetic fiber staple yarns or filaments thereof, and the roving yarns are pure cotton yarns or blended yarns of pure cotton and other fibers; the composite low-twist yarn is manufactured into a warp beam through warping and slashing, then is interwoven with the ground warp and the weft through a towel loom or a warp knitting machine to form a looped fabric, and then is manufactured into a composite low-twist yarn towel through dyeing and finishing treatment and sewing procedures; compared with the untwisted yarn towel formed by the traditional PVA twisting and untwisting method, the composite untwisted yarn has the characteristics of similar hand feeling and softness, similar appearance style, lower molting rate and more durability, and can obviously improve the weaving efficiency.

Description

Composite low-twist yarn towel and production method thereof

Technical Field

The invention belongs to the field of textile products, and particularly relates to a composite low-twist yarn towel and a production method thereof.

Background

Towel products are daily textiles with large quantity and wide range. Among them, the untwisted towel is one of the highest grade towel products, and is favored by consumers with unique fluffiness, soft hand feeling and super-strong water absorption performance. However, the existing method for producing the untwisted towel is to use a soluble vinylon and a cotton yarn to twist in opposite directions to form a bifilar yarn. The problem of weaving strength is solved, and after weaving is finished, the soluble fiber is dissolved by using hot water of 85-90 degrees, so that the twist of the cotton yarn is loosened. Forming the untwisted towel. However, in this method, vinylon is dissolved in water, which results in a large amount of vinylon consumption, and the dissolution of vinylon in water causes water pollution and a great pressure on water treatment in factories.

The prior application of the inventor of the present invention, namely the towel product produced by the method for producing untwisted towels under the patent number ZL 200710017170.0, successfully overcomes the defects existing in the prior art, and avoids the problem of water pollution caused by the fact that vinylon is dissolved in water, but after the obtained towel product is used, the obtained towel product is found to have certain differences in terms of product bulk and softness after washing compared with the traditional PVA untwisted yarn towel, and meanwhile, the problem of high molting rate exists, and the problems seriously affect the use of the product, so that how to overcome the defects existing in the prior art becomes one of the problems to be solved by the technical staff in the field.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a composite twisted yarn towel and a production method thereof, wherein the composite low-twist towel consists of terry yarns, ground warps and weft yarns, wherein the ground warps and the weft yarns are yarns for normal towels, the terry yarns are composite low-twist yarns, the composite low-twist yarns consist of two yarns with different thicknesses, the spun yarns are synthetic fiber staple yarns or filaments thereof, and the roving yarns are pure cotton yarns or blended yarns of the pure cotton and other fibers; the composite low-twist yarn is manufactured into a warp beam through warping and slashing, then is interwoven with the ground warp and the weft through a towel loom or a warp knitting machine to form a looped fabric, and then is manufactured into the composite low-twist yarn towel through dyeing and finishing and sewing procedures. Compared with the untwisted yarn towel formed by the traditional PVA twisting and untwisting method, the composite untwisted yarn has the characteristics of similar hand feeling and softness, similar appearance style, lower molting rate and more durability, and can obviously improve the weaving efficiency.

The invention adopts the following technical scheme:

a composite twisted yarn towel is composed of three parts, namely terry yarn, ground warp yarn and weft yarn, wherein the ground warp yarn and the weft yarn are yarns for normal towels, the terry yarn is a composite low-twist yarn, the composite low-twist yarn is composed of two yarns with different thicknesses, the spun yarn is synthetic fiber staple fiber yarn or filament yarn thereof, the grammage of the spun yarn is not higher than 27.8g, the roving is pure cotton yarn or blended yarn of the pure cotton and other fibers, the grammage of the roving is not lower than 18.2g, and the twist coefficient of the roving is not higher than 295;

in addition to the above technical solution, it is further preferable that:

the spun yarn is a regenerated cellulose fiber yarn or filament yarn, the gram weight of kilometers is not higher than 14.5g, the roving yarn is pure cotton yarn, the gram weight of kilometers is not lower than 36.4g, and the twist coefficient of the roving yarn is not higher than 258;

wherein the regenerated cellulose fiber yarn or filament is selected from common viscose yarn, modal, rich viscose, cuprammonium fiber or lyocell and other spun yarn or filament yarn, and polyester, chinlon, acrylic and other synthetic fiber yarn or spun yarn;

the raw materials of the rough yarn and the spun yarn are directly purchased products in the market, and can also be directly prepared according to the prior art, and the inventor does not need to describe any more;

the single yarn twisting direction of two yarns in the composite low-twist yarn is the same, and the ply twisting direction is opposite to the single yarn twisting direction; the twist coefficient of the folded yarn is not higher than 295, and is further optimized to be not higher than 258; most preferably the plied yarn twist multiplier is no greater than 230;

compared with the prior art, particularly the prior application ZL 200710017170.0 named as a method for producing untwisted towels, the invention is characterized in that:

(1) the spun yarn has different components: the spun yarn in the composite yarn is made of synthetic fibers (such as various regenerated cellulose fibers, terylene, chinlon and the like), in particular to regenerated cellulose fibers such as lyocell, modal, high-strength viscose or other types of viscose;

the synthetic fiber is longer than pure cotton fiber (the length of the synthetic fiber is generally 38mm, while the length of common cotton fiber is generally 28-33mm), has good uniformity (the length of the synthetic fiber is consistent, the length of the natural fiber is inconsistent, and the natural fiber has the length from 13mm to 33mm), is favorable for improving the strength of spun yarn and the strength of composite untwisted yarn, and is helpful for high-speed weaving, meanwhile, the hand feeling of the synthetic fiber is better than that of cotton fiber before washing or after washing for many times, and the characteristics of the synthetic fiber are also favorable for reducing the molting rate of a final product; thus, there is a significant advance over the prior art.

(2) The twist factor and twist of the roving are lower than those of the original roving, and the breaking strength is high:

the roving in the composite yarn of the prior application can be obtained by normal spinning technical means, the breaking strength of the roving is limited to meet weaving conditions, and the twist cannot be reduced to the twist of the roving in the composite low-twist yarn disclosed in the patent application. The roving in the composite yarn is spun by a specially improved spinning machine, and compared with the roving in the composite yarn of the original patent, the hairiness of the roving is reduced by more than 20% under the same process condition and the same twist, and the strength can be improved by more than 7.5%;

in order to achieve the purpose, the inventor selects the traditional spinning frame FA507 to add some special devices to reduce yarn hairiness and improve resultant yarn strength, and the specific improvement can be selected from the following modes:

(1) a rough yarn hanging frame of a siro spinning device is modified on an FA507 spinning frame, and a rough cotton sliver collector is additionally arranged at an inlet of a rough yarn strand entering a rear roller, so that the purpose of spinning yarns of a strand yarn structure on the spinning frame is realized, and the single-yarn strand yarn structure is beneficial to the reduction of yarn hairiness and the improvement of yarn strength; the added sliver condenser is shown as the positions (r) in the attached figure 1 and figure 2.

(2) A negative pressure air suction compact spinning device is additionally arranged on an FA507 spinning frame to realize the compact spinning on a common ring spinning frame, the spinning principle of the technology is that the compact spinning negative pressure air suction device is additionally arranged below the output end of a leading-out front roller to cluster roving strands and concentrate floating hairiness of the roving strands to a yarn main body, so that the hairiness is reduced, and the resultant yarn strength is improved, and the device is shown in the position II of the attached drawing 1 and the position 3 of the attached drawing.

(3) A special tangential belt (arranged between an output roller and a thread guide hook of a lappet) is added on an FA507 spinning machine and has the function of false twisting of fiber strands output by a front roller, the twist degree of the fiber strands from a false twister to the output roller and between the false twister to a steel wire ring is greatly improved through a false twisting device, a spinning triangular area is eliminated, hairiness formed by floating fibers on a yarn body main body is greatly reduced, the yarn forming strength is also greatly improved, and broken ends are obviously reduced. The speed of false twister (tangential belt) is controlled by servo motor, the sliver output from front roller forms an included angle through false twister, and is arc contact, the speed of false twister and roller output line is set with specific linear speed ratio, generally between 1.2-1.5, the device is shown in figure 1 position and figure 4.

Through the independent technical transformation or the random combined technical transformation of the (1), (2) and (3), the spinnability of the yarn can be obviously improved, and the efficiency of the machine table is increased. After the FA507 spinning frame uses the technology, under the condition of the same twist coefficient (not higher than 295), the breaking strength of single yarn is improved by more than 7.5 percent, and hairiness above 3mm can be reduced by more than 20 percent; the composite technology (shown in figure 5) with the 3 technological improvements can reduce the single yarn twist coefficient to 200 at the lowest under the condition of meeting the normal weaving yarn strength; the soft hand feeling of the yarn for the towel is realized, and the composite technology of the 3 process improvements can be preferably used as the optimal weaving mode;

after the FA507 spinning frame is improved, all production parameters are unchanged, and only when the false twister is additionally arranged, the speed of the output line of the false twister and the speed of the output line of the roller are required to be adjusted to set a specific linear velocity ratio which is generally between 1.2 and 1.5.

(3) The hand feeling and style of the final product are greatly different: because the synthetic fiber yarn or filament, especially the regenerated cellulose fiber yarn or filament, has softer hand feeling than the pure cotton spun yarn with the same thickness, the towel made of the composite low-twist yarn has bulkier and softer hand feeling than the towel obtained in the prior application, and the thickness of the composite low-twist yarn towel in the patent is 10% higher than that of the towel made in the prior patent of the applicant; the softness of the hand feeling is also obviously better than that of the prior patent, and is more similar to the traditional PVA untwisted yarn.

(4) The dehairing rate of the final product is lower: because the synthetic fiber has long fiber length and uniform uniformity, and the roving fiber hairiness in the composite yarn is less than that in the towel obtained by the prior art, the product molting rate of the composite low-twist yarn product after 5 times is at least 0.5 per thousand lower than that of the towel obtained by the prior art.

The inventor further provides a production method of the composite twisted yarn towel, which comprises the following specific steps:

1. spinning:

(1) spinning fine yarns: spinning synthetic short fibers or regenerated cellulose fibers or a mixed component thereof according to a conventional cotton spinning technology, wherein the kilometer gram weight of the spun fine yarns is not higher than 27.8g, the twist direction of the spun fine yarns is not fixed, the Z-direction twist is further optimized, and the twist coefficient of the spun fine yarns is not limited; the spun fine yarn is further optimized into regenerated cellulose fibers such as viscose, modal, lyocell, cuprammonium fiber, rich viscose and the like, and the kilometer gram weight of the spun fine yarn is further optimized to be not higher than 14.5 g; the spinning process adopts a conventional spinning process;

(2) spinning thick yarns: opening, removing impurities, carding and drawing cotton fibers or mixed fibers of the cotton fibers and other fibers according to a conventional spinning technology to form roving strips;

the method is characterized in that the roving sliver is drafted on a spinning machine to spin the roving, the purpose is to improve the strength of the roving, reduce the hairiness of the yarn and improve the quality of the yarn to meet the requirement of smooth weaving, and the specific improved device is briefly described as follows:

a plurality of special devices are additionally arranged on a traditional spinning frame FA507 to reduce yarn hairiness and improve resultant yarn strength, and the specific improvement can be selected from the following modes:

(1) a siro spinning roving yarn hanging frame is modified on an FA507 spinning frame, a roving sliver collector is additionally arranged at an inlet of a rear roller where roving strands enter, the purpose of spinning yarns of a strand yarn structure on the spinning frame is achieved, and the single-yarn strand yarn structure is beneficial to reduction of yarn hairiness and improvement of yarn strength; the additional thick sliver condenser is shown as the position (r) in the attached figure 1 and the figure 2;

(2) the negative pressure air suction compact spinning device is additionally arranged on an FA507 spinning frame to realize the compact spinning on a common ring spinning frame, the spinning principle of the technology is that the compact spinning negative pressure air suction device is additionally arranged below the output end of a leading-out front roller to cluster roving strands and concentrate floating hairiness of the roving strands to a main yarn, so that the hairiness is reduced, and the resultant yarn strength is improved, and the device is shown in the position II of the attached drawing 1 and the position 3 of the attached drawing;

(3) a special tangential belt (arranged between an output roller and a thread guide hook of a lappet) is added on an FA507 spinning machine and has the function of false twisting of fiber strands output by a front roller, the twist degree of the fiber strands from a false twister to the output roller and between the false twister to a steel wire ring is greatly improved through a false twisting device, a spinning triangular area is eliminated, hairiness formed by floating fibers on a yarn body main body is greatly reduced, the yarn forming strength is also greatly improved, and broken ends are obviously reduced. The speed of the false twister (tangential belt) is controlled by a servo motor independently, the fiber strips output by the front roller form an included angle through the false twister and are in arc contact, the speed of the false twister and the output line speed of the roller set a specific linear speed ratio which is generally between 1.2 and 1.5, and the device is shown as the position (third to the position) of the attached figure 1 and the figure 4;

besides the rough yarn is drafted and spun on the spinning machine by the rough yarn strips, the strength of the rough yarn can be improved and hairiness can be reduced by changing the cotton distribution of the rough yarn; for example, the cotton quality is improved, long stapled cotton (the length of the cotton main body is 30mm or more) is selected to achieve the aim, or synthetic fibers such as various terylene, chinlon, various regenerated cellulose fibers and the like are mixed in the cotton,

no matter which mode is adopted, the requirements that the weight of kilometers of the finally obtained roving yarn count is not less than 18.2g, the twist factor of the roving spun in the working procedure is not higher than 295, the gram weight of kilometers is further optimized to be not less than 36.4g, and the twist factor is not higher than 258 are met; in this way, the subsequent processes can be carried out,

the twisting direction of the rough yarn spun in the step is the same as that of the spun yarn spun in the step (1);

(3) and (3) doubling: and (3) combining the yarns spun in the steps (1) and (2) on a doubling machine.

(4) Twisting: twisting the combined yarn in the step (3), wherein the twisting direction is opposite to the twisting direction of the coarse yarn and the fine yarn spun in the steps (1) and (2). The twist multiplier of the plied yarn is not higher than 295, further optimized to be not higher than 258; most preferably the plied yarn twist multiplier is no greater than 230;

(5) spooling: and (4) spooling the yarn prepared in the step (4) to prepare for dyeing or warping.

2. Yarn dyeing: if the product is the terry fabric which is dyed and then knitted, the yarn required by the terry fabric is dyed, and in order to reduce the strength loss of the yarn, the winding tension during the process of dyeing and loosening the yarn cylinder is reduced.

3. Warping: warping the ground warp and the terry yarn according to the process requirement.

4. Sizing: and (3) respectively sizing the wool warp beam and the ground warp beam, wherein when the ground warp is sized, the conventional technical scheme is adopted. When sizing is carried out on the wool warp beam, sizing is carried out by adopting a 'single-dipping single-pressing' heavy-coating sizing mode so as to reduce broken ends of the wool warp yarns;

5. weaving: the desired loop fabric is woven on a towel loom or a warp knitting machine.

6. Dyeing grey cloth: and carrying out relevant dyeing and finishing treatment on the looped fabric woven in the previous process.

7. Dehydrating, drying or shaping: and (3) dehydrating, drying and shaping the dyed fabric.

8. Sewing to obtain the required finished loop fabric: and (4) curling and sewing the product to obtain the required product.

In addition, other production steps which are not mentioned in the invention are all completed by adopting the prior art; the process parameters employed may be the same as those in the applicant's prior application referred to above;

in addition, due to the fact that PVA is not used in the technical scheme, the PVA consumption per ton of yarn is reduced by 5.5% -13%; in the prior art, the COD index of the wastewater formed by PVA is about 21000, while the COD index of the wastewater formed by the finally obtained towel is within 10000 in the technical scheme, which is caused by no use of PVA; meanwhile, compared with the prior art, the manufacturing rate of the invention can be improved by 5-13%, and the production efficiency is greatly improved; the five-time molting rate (AATCC135 washing method) of the product is 0.1 per mill less than that of the traditional untwisted yarn and 0.05 per mill less than that of the prior patent;

the hand feeling and the bulk of the product obtained by the invention are close to those of the traditional PVA untwisted yarn, mainly because the twist of the rough yarn (formed by twisting and detwisting in plying) in the composite low twist yarn is very close to or even the same as that of the traditional untwisted yarn (the traditional untwisted yarn actually keeps a small twist), and the wrapping and the binding of the synthetic fiber spun yarn to the rough yarn are smaller than those of pure cotton, so that the hand feeling and the bulk are both close to those of the traditional untwisted yarn. Compared with the prior patent, the roving with small twist and the synthetic fiber with good hand feeling are the reasons that the hand feeling and bulkiness of the product obtained by the invention are superior to those of the prior patent.

Compared with the untwisted yarn towel formed by the traditional PVA twisting untwisting method, the composite untwisted yarn prepared by the method has the characteristics of similar hand feeling softness and appearance style, lower molting rate and more durability, and can obviously improve the weaving efficiency.

Drawings

FIG. 1 is a schematic structural diagram of a key improved part of a modified spinning frame FA507 adopted by the invention,

FIG. 2 is a photograph of the physical structure of a spinning frame FA507 after the modified siro spinning device is adopted;

FIG. 3 is a photograph of the physical structure of a spinning frame FA507 after the compact spinning apparatus is modified;

FIG. 4 is a photograph of the physical structure of a spinning frame FA507 after the modified false twisting device is adopted;

FIG. 5 is a photograph showing the physical structure of a spinning frame FA507, which is obtained by sequentially adding a siro spinning device, a compact spinning device and a false twisting device.

Detailed Description

Example 1

Composite low-twist yarn towel and production method thereof

Taking a woven terry fabric as an example: the method comprises the following specific steps:

(1) and the composite low twist yarn is made of fibers: the viscose fiber comprises 100% of fine yarn viscose fiber and 100% of coarse yarn cotton, wherein the viscose fiber is made of viscose fiber which is 1.1dtex 38mm and is produced by Sichuan Yibin silk Li ya group and is named as Gracell.

(2) The thick count yarn count of the composite low twist yarn is as follows: 48.6tex, fine count 7.3 tex;

(3) the twist of the thick count yarn of the composite low twist yarn is as follows: the twist coefficient is not higher than any twist corresponding to 295, the twist of the fine yarn is 130t/10cm, and the twist directions of the coarse yarn and the fine yarn are Z-direction twist;

(4) the thick yarn of the composite low twist yarn is spun on a modified spinning frame, such as a siro spinning device, a compact spinning device, a false twisting device or a composite improvement device thereof, and the specific process is as follows according to the modification mode of the spinning frame:

(A) the technological parameters of spinning thick count yarn on the spinning frame with siro spinning are as follows: the roving basis weight is 8 g/10 m X2, and the spun yarn tex is 48.6 tex; total draft multiple: 36.4 times, design twist 39 twist/10 CM, spindle speed 7950 revolutions per minute, front roller speed 256 revolutions per minute. Compared with the thick count yarn obtained by conventional ring spinning under the same process conditions, the thick count yarn obtained by the method has the advantages that the average strength is improved: 5.3 percent, the number of hairiness with the diameter of 3mm is reduced by 8 percent, and the coefficient of variation of strength is reduced by 0.3 percent.

(B) The technological parameters of spinning thick count yarn on the spinning frame with compact spinning are as follows: the roving ration is 8 g/10 m, and the spun yarn tex is 48.6 tex; total draft multiple: 18.2 times, design twist 39 twist/10 CM, spindle speed 7950 rpm, front roller speed 256 rpm. Compared with the thick count yarn obtained by conventional ring spinning under the same process conditions, the thick count yarn obtained by the method has the advantages that the average strength is improved: 7.8 percent, the number of hairiness roots with the diameter of 3mm is reduced by 20 percent, and the coefficient of variation of strength is reduced by 0.8 percent.

(C) The technological parameters of spinning the thick count yarn on the spinning frame with the siro spinning and compact spinning composite device are as follows: the roving basis weight is 8 g/10 m X2, and the spun yarn tex is 48.6 tex; total draft multiple: 36.4 times, design twist 39 twist/10 CM, spindle speed 7950 revolutions per minute, front roller speed 256 revolutions per minute. Compared with the thick count yarn obtained by conventional ring spinning under the same process conditions, the thick count yarn obtained by the method has the advantages that the average strength is improved: 12.2 percent, the number of hairiness with the diameter of 3mm is reduced by 24.5 percent, and the coefficient of variation of strength is reduced by 1.9 percent.

(D) The technological parameters of the thick count yarn on the spinning frame with the siro, compact spinning and false twisting composite device are as follows: the roving basis weight is 8 g/10 m X2, and the spun yarn tex is 48.6 tex; total draft multiple: 36.4 times, the design twist is 39 twists/10 CM, the spindle speed is 7950 revolutions per minute, the front roller speed is 256 revolutions per minute, and the ratio of the front roller linear speed to the false twist tangential belt linear speed is 1.33. Compared with the thick count yarn obtained by conventional ring spinning under the same process conditions, the thick count yarn obtained by the method has the advantages that the average strength is improved: 28.4 percent, the number of hairiness with the diameter of 3mm is reduced by 32.7 percent, and the coefficient of variation of strength is reduced by 2.7 percent.

The following table shows the comparison of the main indexes of the thick yarn obtained under the same environment, the same cotton blending and the same process conditions:

spinning method	Common ring spinning	Siro spinning	Compact spinning	Compact sirospun	Siro compact false twist composite spinning
						Average strength CN	678	714.1	731.2	760.6	870.4
Number of hairs of 3mm	49	45	39	37	33
						Strong CV%	7.5％	7.2％	6.7％	5.6％	4.8％

Therefore, the spinning machine with the siro, compact spinning and false twisting composite device is the optimal choice, and other transformation modes can be randomly selected or combined according to weaving requirements;

this example uses a combination of the D process, i.e., compact spinning, siro spinning and false twisting.

(5) The thick yarn and the thin yarn of the composite low-twist yarn are doubled and twisted to form the composite low-twist yarn, the ply twist of the composite low-twist yarn is 26t/10cm, and the twist direction of the composite low-twist yarn is the S direction;

(6) the ground warp yarn of the composite low-twist towel fabric is 21s/2, and the weft yarn of the composite low-twist towel fabric is 16 s; warping the 21s/2 ground warp and the 48.6tex/7.3tex composite low-twist wool warp of the composite low-twist towel respectively to form a ground warp beam and a wool warp beam respectively;

(7) and (4) respectively sizing the warp beams formed in the step (6) to respectively form a ground warp beam and a warp beam. When the wool warp is used for weaving the beam for sizing, a single-soaking single-pressing mode is adopted as a sizing mode, so that the number of broken ends of the wool warp is reduced, and the smooth weaving is guaranteed.

(8) And (3) weaving the wool warp and the ground warp in the step (7) and 16s weft yarns on a shuttleless towel loom to weave a low-twist composite semi-blank looped fabric, or weaving a warp-knitted low-twist composite looped fabric on a warp-knitted towel loom by using the wool warp and the ground warp in the step (7) only.

(9) And (3) desizing, bleaching, dyeing, polishing, soaping, softening, dehydrating, scutching, drying and sizing the low-twist composite terry fabric woven in the step (8) to form the low-twist composite terry fabric. The above processes are all conventional technical means.

(10) And (4) cutting and sewing the low-twist composite terry fabric formed in the step (9) to form a soft and fluffy low-twist composite terry fabric product.

The low-twist composite loop fabric formed by the technical scheme has the following advantages:

(1) compared with the traditional water-soluble or alkali-soluble untwisted terry fabric: less pollution, low energy consumption, high yield, low molting rate and similar hand feeling and filling power of the product; the benefits obtained with the towel using untwisted yarn produced using 48.6tex/80sPVA yarn are as follows:

note: the test data is obtained under the same cotton matching, the same pretreatment process condition, the same dyeing and post-treatment conditions, and the data may have a slight difference between different colors and different cotton matching.

(2) In the same ratio as the terry fabric of US7810308B 2: the thickness of the composite low-twist yarn towel is 10% higher than that of the composite low-twist yarn towel; the softness of the hand feeling is also obviously better than that of the prior patent, and is more similar to the traditional PVA untwisted yarn.

Example 2

Composite low-twist yarn towel and production method thereof

(1) and the composite low twist yarn is made of fibers: 100% Modal fiber for fine count yarn, which is Modal under the trade name lenzing (tm) Modal with a specification of 1.3dtex X38mm, produced by austria lanjing, 100% cotton for coarse count yarn.

(2) The thick count yarn count of the composite low twist yarn is as follows: 41.6tex, 7.3tex for fine count,

(3) the twist of the thick count yarn of the composite low twist yarn is as follows: the twist factor is not higher than any twist corresponding to 295, the twist of the fine yarn is 120t/10cm, and the twist directions of the coarse yarn and the fine yarn are Z-direction twists.

(4) The thick yarn of the composite low twist yarn is spun on an improved or modified spinning frame, for example, the thick yarn is spun by adopting a siro, compact, false twist or a composite improvement device thereof, the improvement mode C in the embodiment 1 is selected for improvement, and the finally obtained thick yarn has the yarn strength which is about 12 percent higher than that of the yarn without improvement and the hairiness which is about 3mm or more is reduced by about 25 percent.

(5) The thick yarn and the thin yarn of the composite low-twist yarn are doubled and twisted to form the composite low-twist yarn, the ply twist of the composite low-twist yarn is 20t/10cm, and the twist direction of the composite low-twist yarn is the S direction.

(6) The ground warp of the composite low-twist towel fabric is 48.6tex, and the weft is 36.4 tex; and warping the 48.6tex ground warp and the 41.6tex/7.3tex composite low-twist wool warp of the composite low-twist towel respectively to form a ground warp beam and a wool warp beam respectively.

(8) And (3) weaving the wool warp and the ground warp in the step (7) and the 36.4tex weft yarn on a shuttleless towel loom to weave a low-twist composite half-blank terry fabric, or weaving the warp-knitted low-twist composite terry fabric on a warp-knitted towel loom by using the wool warp and the ground warp in the step (7) only.

(1) compared with the traditional water-soluble or alkali-soluble untwisted terry fabric: less pollution, low energy consumption, high yield, low molting rate, and similar hand feeling and filling power of the product, compared with the untwisted yarn towel produced by adopting 48.6tex/80sPVA yarn, the obtained benefits are as follows:

remarking: the test data is obtained under the same cotton matching, the same pretreatment process condition, the same dyeing and post-treatment conditions, and the data may have a slight difference between different colors and different cotton matching.

(2) In the same ratio as the terry fabric of US7810308B 2: good hand feeling, lower molting rate and more stable production efficiency.

Example 3

Composite low-twist yarn towel and production method thereof

(1) and the composite low twist yarn is made of fibers: fine count 100% Lyocell fibre, wherein Lyocell is LeNZINGTM Lyocell A100 brand produced by Ortlran, and the specification is: 1.56dtex X38mm, coarse count 100% cotton.

(2) The thick count yarn count of the composite low twist yarn is as follows: 97.2tex, the count of fine yarn is 27.8tex,

(4) The coarse yarn of the composite low-twist yarn is spun on an improved or reformed spinning frame, and the 97.2tex coarse yarn is spun on the spinning frame additionally provided with the siro spinning in the embodiment. The specific process parameters are as follows: the roving basis weight is 8 g/10 m X2, and the spun yarn tex is 97.2 tex; total draft multiple: 18.20 times, the design twist 29.6 twists/10 CM, spindle speed 6190 revolutions/min, front roller speed 266 revolutions/min. Compared with the thick count yarn obtained by conventional ring spinning under the same process conditions, the average strength of the thick count yarn obtained by the method is improved by 4.7 percent, the number of hairiness with the diameter of 3mm is reduced by 3.2 percent, the strength variation coefficient is reduced by 0.41 percent, and the weaving requirement can be met.

(5) The thick yarn and the thin yarn of the composite low-twist yarn are doubled and twisted to form the composite low-twist yarn, the ply twist of the composite low-twist yarn is 26t/10cm, and the twist direction of the composite low-twist yarn is the S direction.

(6) The ground warp yarn of the composite low-twist towel fabric is 24.3tex/2 plied yarn, and the weft yarn is 36.4 tex; and warping the 24.3tex/2 plied ground warp and the 97.2tex/27.8tex composite low-twist wool warp of the composite low-twist towel respectively to form a warp beam and a warp beam respectively.

(1) compared with the traditional water-soluble or alkali-soluble untwisted terry fabric: less pollution, low energy consumption, high yield, low molting rate, similar hand feeling and filling power of the product,

the benefits obtained with the towel using the 97.2tex/80sPVA yarn over the untwisted yarn produced were as follows:

Example 4

Composite low-twist yarn towel and production method thereof

(1) and the composite low twist yarn is made of fibers: 75D/72F viscose filament yarn of fine count yarn, artificial filament yarn produced by Jilin chemical fiber selected for the filament yarn of fine count yarn, and 100% cotton of coarse count yarn

(2) The thick count yarn count of the composite low twist yarn is as follows: 48.6tex, fine yarn 75D/72F FDY viscose (equivalent to 8.33tex),

(3) the twist of the thick count yarn of the composite low twist yarn is as follows: the twist factor is not higher than 295 arbitrary twist, the twist direction of the thick yarn is Z-direction twist.

(4) The rough yarn of the composite low twist yarn is spun on a modified or improved spinning machine, such as a siro spinning machine, a compact spinning machine, a false twisting machine or a composite modification device thereof, in the embodiment, the improvement mode D in the embodiment 1 is selected for improvement, and the finally obtained rough yarn has the strength which is about 10 percent higher than that of the unmodified yarn and the hairiness which is about 30 percent lower than that of the yarn with 3mm or more.

(6) The ground warp of the composite low-twist towel fabric is 27.tex/2, and the weft is 36.4 tex; and warping the 27.8tex/2 ground warp and the 48.6tex/75D composite low-twist wool warp of the composite low-twist towel respectively to form a ground warp beam and a ground warp beam respectively.

(8) And (3) weaving the wool warp and the ground warp in the step (7) and the weft in 36.4s on a shuttleless towel loom to weave a low-twist composite half-blank terry fabric, or weaving the warp-knitted low-twist composite terry fabric on a warp-knitted towel loom by using the wool warp and the ground warp in the step (7) only.

Example 5

Composite low-twist yarn towel and production method thereof

(1) and the composite low twist yarn is made of fibers: 100% of fine count yarn polyester staple fiber, wherein the polyester staple fiber adopts regenerated polyester staple fiber produced by Hangzhou Penma company, and the fiber specification is as follows: 1.1dtex 38mm, coarse count 100% cotton

(2) The thick count yarn count of the composite low twist yarn is as follows: 18.2tex, fine count 7.3tex,

(3) the twist of the thick count yarn of the composite low twist yarn is as follows: the twist factor is not higher than any twist corresponding to 295, the twist of the fine yarn is 130t/10cm, and the twist directions of the coarse yarn and the fine yarn are Z-direction twists.

(4) The roving of the composite low-twist yarn is spun on an improved or modified spinning frame, the improved spinning frame selected in the embodiment is a spinning frame additionally provided with a siro, compact spinning and false twisting composite device, and the 18.2tex roving has the following process parameters: the fixed weight of the roving is 3.5 g/10 m X2, and the specific number of the spun yarn is 18.2 tex; total draft multiple: 42.7 times, the designed twist is 60 twists/10 CM, the spindle speed 10320 revolutions/minute, the front roller speed 219 revolutions/minute, and the ratio of the front roller linear speed to the false twist tangential belt linear speed is 1.33. The main indexes of the thick count yarn obtained by the method are as follows: average strength: 276.2CN, the number of hairiness root of 3mm is 37/10 m, the coefficient of variation of strength is 6.6%, and the weaving requirement can be satisfied. The conventional ring spinning can not produce the yarn with the twist degree under the condition of not additionally arranging a siro, compact spinning and false twisting composite device.

(5) The thick yarn and the thin yarn of the composite low-twist yarn are doubled and twisted to form the composite low-twist yarn, the ply twist of the composite low-twist yarn is 15t/10cm, and the twist direction of the composite low-twist yarn is the S direction.

(6) The ground warp of the composite low-twist towel fabric is 14.5tex/2, and the weft is 27.8tex

(6) And warping 14.5tex/2 ground warp and 18.2tex/7.3tex composite low-twist wool warp of the composite low-twist towel respectively to form a ground warp beam and a warp beam respectively.

(8) And (3) weaving the wool warp and the ground warp in the step (7) and the 27.8tex weft yarn on a shuttleless towel loom to weave a low-twist composite half-blank terry fabric, or weaving the warp-knitted low-twist composite terry fabric on a warp-knitted towel loom by using the wool warp and the ground warp in the step (7) only.

(9) And (3) desizing and bleaching the low-twist composite terry fabric woven in the step (8) according to the process of the polyester-cotton blended fabric, and dividing the low-twist composite terry fabric into two steps of dyeing (dyeing polyester and then dyeing cotton), polishing, soaping, softening, dehydrating, scutching, drying and sizing to form the low-twist composite terry fabric. The above processes are all conventional technical means.

(1) compared with the traditional water-soluble or alkali-soluble untwisted terry fabric: less pollution, low energy consumption, high yield, low molting rate, and similar hand feeling and filling power of the product, compared with the untwisted yarn towel produced by adopting 18.2tex/80sPVA yarn, the obtained benefits are as follows:

(2) In the same ratio as the terry fabric of US7810308B 2: good hand feeling, low molting rate, better hand feeling after washing and more stable production efficiency.

Example 6

Composite low-twist yarn towel and production method thereof

(4) The strength and hairiness indexes of the thick count yarn of the composite low-twist yarn meet the quality requirement of the next procedure by improving the grade of cotton blending, and the cotton blending of the thick count yarn of the composite low-twist yarn is as follows: the cotton blending for spinning the coarse count yarn is 50% long staple cotton (the fineness of the long staple cotton is about 1.6dtex, the length of the main body is about 35 mm), 50% fine staple cotton (the fineness of the long staple cotton is about 1.5dtex, the length of the main body is about 28 mm), and 12s 35 twist/10 cm yarn is obtained on a common spinning machine according to conventional technical means after the working procedures of blowing, carding, combing, drawing, roving and the like according to the conventional technology.

Claims

1. The composite low-twist yarn towel is composed of terry yarns, ground warp yarns and weft yarns, wherein the ground warp yarns and the weft yarns are yarns for normal towels, and is characterized in that: the terry yarn is a composite low twist yarn, the composite low twist yarn is composed of two yarns with different thicknesses, wherein the spun yarn is synthetic fiber staple yarn or filament yarn thereof, the grammage is not higher than 27.8g, the roving is pure cotton yarn or blended yarn of the pure cotton and other fibers, the grammage is not lower than 18.2g, and the twist coefficient of the roving is not higher than 295.

2. The composite low twist yarn towel of claim 1, wherein:

the spun yarn is a regenerated cellulose fiber yarn or filament yarn, the gram weight of kilometers is not higher than 14.5g, the roving yarn is pure cotton yarn, the gram weight of kilometers is not lower than 36.4g, and the twist coefficient of the roving yarn is not higher than 258.

3. The composite low twist yarn towel of claim 2, wherein: the regenerated cellulose fiber yarn or filament is selected from common viscose yarn, modal, rich viscose, cuprammonium fiber or lyocell or other short fiber yarn or filament yarn, and synthetic fiber yarn or short fiber yarn of terylene, chinlon, acrylic fiber and the like.

4. The composite low twist yarn towel of claim 1, wherein:

the single yarn twisting direction of two yarns in the composite low-twist yarn is the same, and the ply twisting direction is opposite to the single yarn twisting direction; and the twist multiplier of the plied yarn is not higher than 295.

5. The composite low twist yarn towel of claim 1, wherein: the roving has a twist multiplier no greater than 230.

6. The production method of the composite low-twist yarn towel is characterized by comprising the following steps of: the method comprises the following specific steps:

(1) spinning:

(1-1) spinning fine yarns: spinning synthetic short fibers or regenerated cellulose fibers or a mixed component thereof according to a conventional cotton spinning technology, wherein the kilometer gram weight of the spun fine yarns is not higher than 27.8g, the twist direction of the spun fine yarns is not fixed, the preferred twist direction is Z-direction twist, and the twist coefficient of the spun fine yarns is not limited;

(1-2) spinning thick yarns: opening, removing impurities, carding and drawing cotton fibers or mixed fibers of the cotton fibers and other fibers according to a conventional spinning technology to form roving strips;

the weight of kilometer of the roving yarn spun in the working procedure is not less than 18.2g, and the twist factor of the spun roving yarn is not higher than 295; the twisting direction of the rough yarn spun in the process is the same as that of the spun yarn spun in the step (1);

(1-3) doubling: merging the yarns spun in the steps (1) and (2) on a doubling machine;

(1-4) twisting: twisting the combined yarn in the step (3) in the same twisting direction as the step (1); (2) the twisting directions of the spun thick yarns and the spun thin yarns are opposite; the twist multiplier of the plied yarn is not higher than 295;

(1-5) spooling: spooling the yarn prepared in the step (4) to prepare for dyeing or warping;

(2) and yarn dyeing: if the product is a terry fabric which is dyed and then knitted, the yarn required by the terry fabric is dyed, and in order to reduce the strength loss of the yarn, the winding tension during the process of dyeing and loosening the yarn cylinder is reduced;

(3) and warping: warping the ground warp and the terry yarn according to the process requirement;

(4) sizing: respectively sizing the wool warp beam and the ground warp beam, wherein when sizing the ground warp, the sizing is carried out according to the conventional technical scheme; when sizing is carried out on the wool warp beam, sizing is carried out by adopting a 'single-dipping single-pressing' heavy-coating sizing mode so as to reduce broken ends of the wool warp yarns;

(5) weaving: weaving the required terry fabric on a towel loom or a warp knitting machine;

(6) dyeing grey cloth: carrying out relevant dyeing and finishing treatment on the looped fabric woven in the previous procedure;

(7) dehydrating, drying or shaping: dehydrating, drying and shaping the dyed fabric;

(8) and (3) sewing to obtain the required finished loop fabric: and (4) curling and sewing the product to obtain the required product.

7. The method for producing a composite low twist yarn towel according to claim 6, characterized in that:

(1-2) the manner of obtaining the thick count yarn in the spinning thick count yarn is as follows:

the method is characterized in that the roving sliver is drafted and spun on an improved spinning machine to obtain the roving, the strength of the roving is improved, the hairiness of the yarn is reduced, the quality of the yarn is improved to meet the requirement of smooth weaving, and the specific improved device is briefly as follows:

a special device is added on a traditional spinning frame FA507 to reduce yarn hairiness and improve resultant yarn strength, and the specific improvement can be any one or the combination of the following modes:

(1) a siro spinning roving yarn hanging frame is modified on an FA507 spinning frame, a roving sliver collector is additionally arranged at an inlet of a rear roller where roving strands enter, the purpose of spinning yarns of a strand yarn structure on the spinning frame is achieved, and the single-yarn strand yarn structure is beneficial to reduction of yarn hairiness and improvement of yarn strength;

(2) the negative pressure air suction compact spinning device is additionally arranged on an FA507 spinning frame to realize the compact spinning on a common ring spinning frame, and the spinning principle of the technology is that the compact spinning negative pressure air suction device is additionally arranged below the output end of a leading-out front roller to cluster roving strands and concentrate floating hairiness of the roving strands to a yarn main body, so that the hairiness is reduced, and the resultant yarn strength is improved;

(3) a special tangential belt is added on an FA507 spinning frame and is arranged between an output roller and a thread guide hook of a lappet, the function of the special tangential belt is to generate false twisting action on strands output by a front roller, the twist degree of the strands from a false twister to the output roller and between the false twister to a steel wire ring is greatly improved through a false twisting device, and a spinning triangular area is eliminated; the speed of the false twister is controlled by a servo motor independently, the fiber strands output by the front roller form an included angle through the false twister and are in arc contact, and the speed of the false twister and the speed of the output line of the roller set a specific linear speed ratio of 1.2-1.5.

8. The method for producing a composite low twist yarn towel according to claim 6, characterized in that:

the strength of the thick count yarn is improved and hairiness is reduced by changing the cotton distribution of the thick count yarn; in particular, this can be achieved by selecting long staple cotton or by incorporating synthetic fibers into the cotton.

9. The method for producing a composite low twist yarn towel according to claim 8, characterized in that:

the synthetic fiber is terylene, chinlon, acrylic fiber or other regenerated cellulose fiber.