CN110699801A

CN110699801A - Pure cotton super-soft yarn and super-soft bedding fabric and production process thereof

Info

Publication number: CN110699801A
Application number: CN201911182525.0A
Authority: CN
Inventors: 张永林; 季卫星; 唐建新; 张余俊
Original assignee: Jiangsu Tangsheng Textile Technology Co Ltd
Current assignee: Jiangsu Tangsheng Textile Technology Co Ltd
Priority date: 2019-11-27
Filing date: 2019-11-27
Publication date: 2020-01-17

Abstract

The invention relates to the field of textiles and discloses a pure cotton super-soft yarn and super-soft bedding fabric and a production process thereof. The pure cotton super-soft yarn comprises a super-soft yarn body; the ultra-soft yarn body is made of pure cotton yarn; the ultra-soft yarn body comprises core yarn and wrapping yarn; the wrapping yarn is a twisted fiber strand spirally wrapped outside the core yarn; the twist factor of the super-soft yarn body is 260-300. The ultra-low twist yarn with the special structure of combining the core yarn and the wrapping yarn is soft in hand feeling, high in production efficiency, greatly reduced in product cost, stronger in competitive power and wide in market prospect; the super-soft bedding fabric produced by the super-soft yarn has super-soft hand feeling without softening treatment, avoids the harm of a softening agent to human skin, is beneficial to reducing environmental pollution and production cost, is washing-resistant and has lasting and stable performance.

Description

Pure cotton super-soft yarn and super-soft bedding fabric and production process thereof

Technical Field

The invention relates to the field of textiles, in particular to pure cotton super-soft yarn and super-soft bedding fabric and a production process thereof.

Background

With the continuous progress of society, textile technology and textile equipment are continuously developed, yarns and textiles with various characteristics are continuously appeared, and with the improvement of living standard, people have more and more demands on comfortable, healthy, green and other functional textile fabrics. The super-soft products in the market at present mainly utilize after-finishing, especially softening agent to improve the fabric softness, improve the hand feeling, but these finishing technologies endow the fabric softness generally not wash-resistant, and the softening agent has certain harm to human skin, has increased production cost, and the production process of its super-soft product is big to the pollution of environment simultaneously.

Disclosure of Invention

In order to solve the technical problems, the invention provides pure cotton super-soft yarn and super-soft bedding fabric and a production process thereof, and the pure cotton super-soft yarn and super-soft bedding fabric are spun into super-soft yarn with ultra-low twist by adopting a special yarn structure and a spinning process, and then the super-soft bedding fabric is woven, so that the problems that the existing super-soft product mainly utilizes after finishing, particularly a softener to improve the softness of the fabric and improve the hand feeling, and the finishing technology causes the fabric to have the defects of washing resistance, certain harm to human skin, high production cost and great environmental harm are solved.

In order to achieve the purpose, the technical scheme of the invention is as follows: a pure cotton super-soft yarn comprises a super-soft yarn body; the ultra-soft yarn body is made of pure cotton yarn; the ultra-soft yarn body comprises core yarn and wrapping yarn; the wrapping yarn is a twisted fiber strand spirally wrapped outside the core yarn; the twist factor of the super-soft yarn body is 260-300.

As a preferable aspect of the present invention, the core yarn is a 7.3tex single yarn.

As a preferable scheme of the invention, the ultra-soft yarn body is made of Australian cotton fiber; the length of the Australian cotton fiber is 26-35 mm.

In a preferred embodiment of the present invention, the ultra-soft yarn body is 14.5 tex.

A production process of pure cotton super-soft yarn comprises the following steps:

step 1, blowing-carding process; taking Australian cotton as a raw material, and performing blowing-carding operation;

step 2, combing process;

step 3, drawing; mixing by adopting a two-step mixing process, wherein the first step of mixing adopts 6 cotton slivers for mixing, and the second step of mixing adopts 8 cotton slivers for mixing;

step 4, roving;

step 5, spinning; a siro compact spinning frame is adopted, a single yarn feeding device is additionally arranged on the siro compact spinning frame, and the ultra-low twist yarn is formed by compositely twisting a fiber strand drafted by a drafting device of the spinning frame and a single yarn which is not drafted but has tension in a twisting triangular zone.

As an improvement of the production process, in the step 1, an opener, a scutcher and a carding machine are adopted to sequentially operate, and the beating speed of the opener is controlled at 580 revolutions per minute; the speed of a carding needle roller of the scutcher is controlled to be 720 r/min, and the space between an adjusting plate and the roller is 9.6 mm; the cylinder speed of the carding machine is controlled at 420 r/min, the speed of the licker-in is 860 r/min, the output speed of the raw sliver is 110m/min, and the cover plate speed is 195 mm/min;

in step 2, a drawing frame, a lap winder and a combing machine are adopted to sequentially operate, the drawing number of the drawing frame is 6, the total drafting is 5.2 times, the back zone drafting is 1.76 times, and the roller gauge is 6 x 5 x 10 mm; the small coil quantity of the coiler is 65 g/m, the combined number is 24, and the total draft is 1.78 times; the comber has combed sliver ration of 20 g/5 m, speed of 260 pinches/min, top comb insertion depth of +0.5mm, cotton feeding length of 4.28mm and cotton dropping rate controlled at 22-24%;

in step 3, the speed of the front roller is 350m/min during drawing, the roller gauge is 6 x 5 x 10(mm), and the quantity of cooked strips is 19.5 g/5 m;

in step 4, the roving basis weight was 4.6 g/10 m, the back draft was 1.15 times, the roving twist factor was 115, the spindle speed was 950 rpm, and the roller gauge was 9 × 23 × 32 mm.

As an improvement of the production process, in the step 5, an air suction device is arranged before twisting of the fiber strands, loose fibers are gathered and cohered through the control of negative pressure, the fibers are fully straightened in a negative pressure region, and the gathering negative pressure is controlled to be-1000 Pa to-3000 Pa; during the spinning process, the temperature of a workshop is controlled to be 28-30 ℃, and the relative humidity is controlled to be 60-65%; the total draft is 68 times, the draft in the back zone is 1.136 times, the roller gauge is 18mm x 32mm, the spindle speed is 12500 rpm, the rotating speed of the front roller is 220 rpm, and the twist factor is controlled at 260-300.

As an improvement of the production process, the production process further comprises a step 6 of spooling; an automatic winder is adopted, the winding speed is 800m/min, neps are 3.2, the short and thick parts are DS1.65 LS1.3cm, the long and thick parts are DS1.2 LL40cm, the detail D is-15% 30cm, and the winding tension is controlled to be 14-18.

An ultra-soft bedding fabric comprises a fabric body; the fabric body takes the super-soft yarn body as warp and weft, the warp density of the fabric body is 614/10 cm, the weft density of the fabric body is 354/10 cm, and the fabric body adopts a weave structure of 5/3 tribute satin.

A production process of an ultra-soft bedding fabric comprises the following steps:

step a, warping; warping by a warping machine in batches;

step b, sizing; adopting JD-L low sizing rate sizing agent to carry out sizing treatment;

step c, drawing-in process; reed number is 93.5#/2in, reeding width is 274.4cm, and ground organization is 3 reeding/reed; the side weave is 4 in/reed, the ground weave drafting is 23456, the side weave drafting is 1212, and 6 pages of drafting are adopted for weaving;

step d, weaving process; weaving by adopting a wide air jet loom;

step e, post-finishing; the post-finishing process comprises an enzyme desizing process, wherein the hydrophobic impurities on the surface of the cotton fibers are partially removed by pretreatment of alkaline pectinase, and then the cotton fibers are treated by acid cellulase, so that the hydrolysis of the cellulose is enhanced, and the hydrophobic impurities are further removed; the after-finishing process does not include flexible finishing by adopting a softening agent.

Through the technical scheme, the technical scheme of the invention has the beneficial effects that: the ultra-low twist yarn with the special structure, which combines the core yarn and the wrapping yarn (the twist is 25-30% lower than that of the conventional yarn), has soft hand feeling, high production efficiency, greatly reduced product cost, stronger competitive power and wide market prospect; the super-soft bedding fabric produced by the super-soft yarn has super-soft hand feeling without softening treatment, avoids the harm of a softening agent to human skin, is beneficial to reducing environmental pollution and production cost, is washing-resistant and has lasting and stable performance.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic view of the external structure of the super soft yarn body of the present invention.

Fig. 2 is a schematic cross-sectional structure view of the super soft yarn body of the present invention.

The corresponding part names indicated by the numbers and letters in the drawings:

1. wrapping yarn 2. core yarn.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

With reference to fig. 1 and 2, the invention discloses a pure cotton ultra-soft yarn, which comprises an ultra-soft yarn body. The super gentle yarn body is pure cotton yarn. The super gentle yarn body includes core yarn 2 and fasciated yarn 1. The wrapping yarn 1 is a twisted fiber strand spirally wrapped on the core yarn 2. The twist factor of the super-soft yarn body is 260-300. Preferably, the super soft yarn body is 14.5tex, and the core yarn 2 is 7.3tex single yarn.

In order to ensure the performance of the pure cotton super-soft yarn, the super-soft yarn body is preferably made of Australian cotton fibers; the length of the Australian cotton fiber is 26-35 mm.

Example 1

The production process of the pure cotton super-soft yarn comprises the following steps:

step 1, blowing-carding process; pure cotton is adopted as a raw material, and a blowing-carding process is carried out by adopting a conventional method.

Step 2, combing process; the combing process is carried out using conventional methods.

Step 3, drawing; mixing by adopting a two-step mixing process, wherein the first step of mixing adopts 6 cotton slivers for mixing, and the second step of mixing adopts 8 cotton slivers for mixing.

Step 4, roving; the roving process is carried out by a conventional method.

Step 5, spinning; a siro compact spinning frame is adopted, a single yarn feeding device is additionally arranged on the siro compact spinning frame, and the ultra-low twist yarn is formed by compositely twisting a fiber strand drafted by a drafting device of the spinning frame and a single yarn which is not drafted but has tension in a twisting triangular zone. The production of the pure cotton ultra-soft yarn of example 1 was completed.

Example 2

Embodiment 2 is the optimized process of embodiment 1, and the process for producing the pure cotton ultra-soft yarn takes the Australian cotton as a raw material and comprises the following steps:

step 1, blowing-carding process

Aiming at the characteristics of long length, fine fineness, higher impurity content and larger quality difference between packages, the technological measures of 'multi-package grabbing, less frequent grabbing, more loosening and less beating', uniform mixing and proper reduction of beating speed are adopted in the carding procedure. The cotton opener, the scutcher and the carding machine are adopted to operate in sequence, and the beating speed of the cotton opener is controlled at 580 revolutions per minute; the speed of a carding needle roller of the scutcher is controlled to be 720 r/min, and the space between an adjusting plate and the roller is 9.6 mm; the cylinder speed of the carding machine is controlled at 420 rpm, the speed of the licker-in is 860 rpm, the output speed of the sliver is 110m/min, and the cover plate speed is 195 mm/min.

Step 2, combing process

The combing process adopts a drawing frame, a lap winder and a combing machine. The main task of pre-coalescence is to straighten the fibers, with mixing. The operation is carried out in sequence by adopting a drawing frame, a lap winder and a combing machine, the drawing number of the drawing frame is 6, the total drafting is 5.2 times, the back zone drafting is 1.76 times, and the roller gauge is 6 x 5 x 10 mm; the small coil quantity of the coiler is 65 g/m, the combined number is 24, and the total draft is 1.78 times; the comber has combed sliver ration of 20 g/5 m, speed of 260 pinches/min, top comb insertion depth of +0.5mm, cotton feeding length of 4.28mm, and cotton doffing rate controlled at 22-24%.

Step 3, drawing process

The drawing process requires that the fibers are further straightened and parallel, fully and uniformly mixed without mechanical waves, and under the condition of no self-leveling, a two-pass mixing process is adopted for mixing, the first pass of mixing adopts 6 cotton slivers for mixing, and the second pass of mixing adopts 8 cotton slivers for mixing. The operation was carried out using a drawing frame with a front roller speed of 350m/min, a roller gauge of 6 x 5 x 10(mm) and a cooked sliver ration of 19.5 g/5 m.

Step 4, roving process

On the premise of meeting the spun yarn drafting, the twist factor of the roving is properly increased, the elongation of the roving is well controlled, the tension of the roving in front and back rows is controlled within 1.5 percent, the situation that the tension is too large to cause details is avoided, the fixed weight of the roving is 4.6 g/10 m, the drafting in a back zone is 1.15 times, the twist factor of the roving is 115, the spindle speed is 950 revolutions per minute, and the roller spacing is 9 x 23 x 32 (mm).

Step 5, spinning process

The spinning process adopts the process principle of 'super drafting, small drafting in the back area, heavy pressurization and small floating area'. Arranging an air suction device before twisting the strands, and controlling negative pressure to gather and cohere loose fibers, fully straightening the fibers in a negative pressure receiving area, and controlling the negative pressure of the gathering to be-1000 Pa to-3000 Pa; during the spinning process, the temperature of a workshop is controlled to be 28-30 ℃, and the relative humidity is controlled to be 60-65%; the total draft is 68 times, the draft in the back zone is 1.136 times, the roller gauge is 18mm x 32mm, the spindle speed is 12500 rpm, the rotating speed of the front roller is 220 rpm, and the twist factor is controlled at 260-300.

Step 6, a spooling process; an automatic winder is adopted, the winding speed is 800m/min, neps are 3.2, the short and thick parts are DS1.65 LS1.3cm, the long and thick parts are DS1.2 LL40cm, the detail D is-15% 30cm, and the winding tension is controlled to be 14-18. The production of the pure cotton ultra-soft yarn of example 2 was completed.

Examples 3, 4 and 5 are further optimizations of example 2, while examples 3, 4 and 5 are a set of examples that are compared to each other in order to obtain the optimum twist multiplier for the ultra-soft yarn body.

Examples 3, 4 and 5 used the same spinning material and textile equipment.

The spinning raw material is high-quality Australian cotton, and the main quality indexes are as follows: the average length was 30.8mm, the average micronaire value was 4.42, the regularity was 80.92% and the average impurity content was 1.15%.

In the spinning process, the following devices are used in sequence:

according to the spinning process flow sequence:

FA006C → 230 type reciprocating plucker → FA113B type single axial flow opener → FA2008C type six-chamber mixer → JWF1124 type clearer → FA151 type dust remover → FA177B type cotton box → FA221D type carding machine → FA311F type drawing frame (predo) → JWF1381 type sliver lap machine → JWF1272 type combing machine → FA311 type drawing frame (predo) → FA320A type drawing frame (confdo) → FA457A type roving frame → FA506 type spinning machine (saxon reform) → saxorio ORION automatic winder

Example 3

Spinning a 14.5tex pure cotton ultra-soft yarn, comprising the steps of:

step 1, blowing-carding process

Aiming at the characteristics of long length, fine fineness, higher impurity content and larger quality difference between packages, the technological measures of 'multi-package grabbing, less frequent grabbing, more loosening and less beating', uniform mixing and proper reduction of beating speed are adopted in the carding procedure. The main technological parameters are as follows: the beater speed of FA113B is 580 r/min, the distance between the dust rod and the opening roller is 13mm, the distance between the dust rod and the dust rod is 10.5mm, the speed of the JWF1124 card wire roller is 720 r/min, and the distance between the adjusting plate and the roller is 9.6 mm. The cotton carding process adopts the process principles of tight spacing, strong carding, less damage and fast transfer. The main technological parameters are as follows: the cylinder speed is 420 r/min, the roller speed is 860 r/min, the sliver output speed is 110m/min, the cover plate speed is 195mm/min, and the spacing between the cylinder and the cover plate is 0.18mm, 0.15mm and 0.18 mm.

The operation management of the blowing-carding unit is enhanced, the cotton passage and the noil passage are checked at regular time each shift, the cotton passage is ensured not to be hung, and the noil passage is ensured not to be blocked. And (3) increasing the detection frequency in a laboratory, and feeding back and tracking the sliver, nep impurities and weight deviation standard exceeding machine tables in time until the sliver, nep impurities and weight deviation standard exceeding machine tables reach the standard.

Step 2, combing process

The combing process consisted of a preflex FA311F draw frame, JWF1381 lap winder and JWF1272 combing machine. The main task of pre-coalescence is to straighten the fibers, with mixing. The main technological parameters are as follows: 6 were combined, the total draft was 5.2 times, the back zone draft was 1.76 times, and the roller gauge was 6 x 5 x 10 (mm). The main task of the coiler is to uniformly mix and straighten the fiber and make qualified small coils. The method requires that the small coil has clear layers, no broken edges and no sticky coils, and has the main process parameters: the lap basis weight was 65 g/m, the total number of 24, and the total draft was 1.78 times. The main tasks of the combing process are to remove nep impurities and remove short fibers. In order to ensure the single yarn strength of the J14.5tex ultra-soft yarn, short fiber needs to be reduced as much as possible, the fiber uniformity needs to be improved, the noil rate needs to be improved by 2-3%, and the main parameters of a combing process are as follows: the combed sliver ration is 20 g/5 m, the speed is 260 pinches/min, the top comb insertion depth is +0.5mm, the cotton feeding length is 4.28mm, and the cotton dropping rate is controlled between 22 percent and 24 percent.

Step 3, drawing process

The drawing process requires that the fibers are further straightened and parallel, are fully and uniformly mixed without mechanical waves, and adopts a two-pass mixing process, namely mixing and mixing one and mixing two, under the condition of no self-leveling. The main technological parameters are that one is mixed with 6 and the other is mixed with 8. The front roller speed was 350m/min, the roller gauge 6 x 5 x 10(mm), and the cooked strand basis weight was 19.5 g/5 m. The production of each class requires that the bell mouth and the round bar disc are smooth and clean, and no cotton hanging, no accumulated flower and no cotton wax are generated.

Step 4, roving process

On the premise of meeting the spun yarn drafting, the twist coefficient of the roving is properly increased, the elongation of the roving is well controlled, the tension of the roving in front and back rows is controlled within 1.5 percent, and the situation that the excessive tension causes details and the main process parameters of the roving process are prevented: the roving basis weight was 4.6 g/10 m, the back draft was 1.15 times, the roving twist factor was 115, the spindle speed was 950 rpm, and the roller gauge was 9 × 23 × 32 mm.

Step 5, spinning process

Siro spinning is a spinning method for spinning yarns similar to a plied yarn structure on a traditional ring spinning frame. The siro spinning technology is applied to wool spinning at first and then applied to cotton spinning gradually. The siro spinning is to feed two pieces of thick yarn from a horn mouth, keep the separation state of two strands of fiber in the front and back drafting zones, output a certain length from a front jaw, combine the two strands of fiber, and twist the combined fiber by the same spindle to form the siro yarn with the double-strand structure characteristic. The two strands of fiber have small twist, the fiber is easy to redistribute, and the twist is extruded mutually, so that the yarn is soft and becomes the yarn for high-grade fabrics at present.

The siro spinning still has a twisting triangular space, and in order to further reduce the twisting triangular space, reduce hairiness of finished yarn and improve quality of finished yarn, companies technically modify the siro spinning into compact siro spinning equipment on the basis of siro spinning. The air suction device is added before twisting the fiber strands, loose fibers are gathered and cohered through the control of negative pressure, the fibers are fully straightened in a controlled area, the twisting triangular area on the traditional spinning machine is reduced, and the fibers are twisted in a parallel and compact state. Because all the fibers in the fiber strand are stressed uniformly and tightly cohered, the resultant yarn structure and quality are improved comprehensively, and the hairiness, the strength, the evenness, the wear resistance and the yarn appearance are improved obviously.

Compact siro spinning is a composite spinning method combining compact spinning and siro spinning, the yarn spun by the technology combines the excellent characteristics and quality of two spinning methods, compared with the traditional ring spinning single yarn and siro yarn, the compact siro yarn has less hairiness and higher strength, has the effect of siro spinning plying, is an ideal raw material for spinning high-grade fabrics, and has good development prospect.

In order to spin J14.5tex super-soft yarn, technical improvement is carried out on the basis of siro compact spinning. A single yarn feeding device is additionally arranged on a siro compact spinning frame, the yarn is a composite yarn formed by compositely twisting a strand drafted by a drafting device of the spinning frame and a J7.3tex single yarn which is not drafted but has certain tension in a twisting triangular area, the fiber between two strands basically does not transfer, the J7.3tex single yarn which has tension but is not drafted is wrapped and wound in the middle of the fiber strand with twist, the super-soft yarn with the special structure of the core yarn 2+ the wrapped yarn 1 is formed, and the yarn body is soft and expanded. Through the transformation, the twist of the ultra-soft yarn body can be reduced by 25 to 30 percent compared with the normal twist. Through the design adjustment of relevant main process components, a novel spinning technology comprising a compact spinning twisting triangular area and two siro-field twisting areas is formed. The composite spinning technology of compact sirofil spinning realizes the unique yarn body structure of the core yarn 2+ the wrapping yarn 1, and the yarn body has soft and fluffy hand feeling. The Sirofil composite yarn has less single yarn hairiness and greatly increased yarn strength and elongation due to the wrapping effect. Under same single strong, super gentle yarn body twist factor can descend 30%, and the speed is fast than traditional spinning speed, has improved the efficiency of machine. The Sirofil textile has unique style and good wearability. The method has the advantages of high technical content, greatly reduced product cost, stronger competitive power and wide market prospect.

Specifically, the spinning process adopts the process principle of 'super drafting, back zone small drafting, heavy pressurization and small floating zone'. The main technological parameters are as follows: the total draft is 68 times, the draft in the back zone is 1.136 times, the roller gauge is 18mm x 32mm, the spindle speed is 12500 rpm, the rotating speed of the front roller is 220 rpm, and the twist factor is controlled at 260. The negative pressure is-3000 Pa, the temperature of the workshop is controlled at 28-30 ℃, and the relative humidity is controlled at 60-65%.

Step 6, spooling process

The key of the spooling process is to remove yarn defects and improve the yield and quality. Due to the fact that the J14.5tex ultra-soft yarn twist is low, hairiness is increased when the yarn is wound, winding speed and winding tension are properly reduced, and yarn strength and elasticity are kept. The main process parameters of spooling are as follows: the winding speed was 800m/min, neps 3.2, short length DS1.65 LS1.3cm, long length DS1.2 LL40cm, detail D-15% 30cm, and winding tension controlled between 14-18.

Example 4

A14.5 tex pure cotton super soft yarn is spun, in example 4 and example 3 except for step 5, in the spinning process, the twist factor is controlled at 270, and the rest is the same.

In the case of the example 5, the following examples were conducted,

a14.5 tex pure cotton super soft yarn is spun, and in example 5 and example 3, except for step 5, in the spinning process, the twist factor is controlled to be 300, and the rest is the same.

Comparative example 1

Comparative example 1 and example 3 except for step 5, the twist multiplier was controlled to 250 in the spinning step, and the spinning was carried out, and the same was carried out.

Comparative example 2

Comparative example 2 was a normal woven yarn, and the twist multiplier was controlled at 360.

Example 3, example 4, example 5, comparative example 1 and comparative example 2 were tested in comparison, with the relevant test data as given in the following table: (in the above data, the average of the evenness data is 10 tubes of spun yarn, the average of the tenacity is 10 tubes, and the average of 5 times of measurement is carried out for each tube)

According to the test data, when the twist coefficient is 250, namely the twist coefficient is reduced by 30.5 percent compared with the normal twist coefficient, the single yarn detail, the slub and the single yarn strength of the pure cotton super-soft yarn are obviously reduced. Considering the subsequent weaving weavability and the requirement that the product needs to greatly reduce the twist to increase the softness of the yarn, the twist factor selection 270 is more ideal by comprehensive consideration. Therefore, example 4 is the best example among examples 3, 4 and 5.

Examples 4, 6 and 7 are also a set of examples that are compared with each other. Examples 6 and 7 are the same as example 4 except that in step 5, the pressure for selecting the negative pressure is different in the spinning step.

In the case of the example 6, it is shown,

spinning 14.5tex pure cotton super soft yarn, and controlling the negative pressure in the spinning step 5 to be-1000 Pa.

Example 7

Spinning 14.5tex pure cotton super soft yarn, and controlling the negative pressure in the spinning step 5 to be-2000 Pa.

The specific test data are as follows:

from the test data, it can be seen that the single yarn strength and single strength CV value of the pure cotton super soft yarn are obviously deteriorated under-1000 Pa, the quality index of-2000 Pa is comparable to the value of-3000 Pa, but the hand feeling of the contrast yarn is obviously softer under-2000 Pa, so that the J14.5tex super soft yarn takes a twist coefficient of 270 and a gathering negative pressure of-2000 Pa as an optimal scheme during normal production.

Example 8

The production process of the super-soft bedding fabric takes the pure cotton super-soft yarns in the embodiment 7 as the warp yarns and the weft yarns, and comprises the following steps:

step a, warping process

Batch warping is carried out by adopting a Benning grid warping machine, the total warp number is 15200(760 multiplied by 20), the warping tension is 350Dan, and the distance between tension rods is as follows: 20cm, tension bar time: 2 seconds and a gripper time of 3 seconds. Warping speed: 600 r/min. The warp is low-twist super-soft yarn, the strength and cohesive force of the yarn are small, and the warping tension and warping speed are small, so that the hairiness of the warp and the elongation and elastic loss of the warp are reduced.

Step b, sizing process

The fabric is bedding fabric, the desizing residual rate is required to be low, the subsequent desizing is performed at low temperature by adopting biological enzyme, if sizing is performed by using a PVA-containing sizing agent formula, the desizing is easy to be incomplete, and the color difference of edges and middle is easy to occur during dyeing, particularly when the fabric is wide. The warp is low twist super soft yarn, and the slashing is mainly used for strengthening, stretching keeping and wear resisting. Therefore, the novel high-performance environment-friendly slurry JD-L2 is adopted, and the sizing rate is low. The slurry has good desizing property, and desizing wastewater is easy to biodegrade. The sizing process adopts a sizing process route of low concentration, medium viscosity, high pressure and small elongation. The low sizing is beneficial to improving the flexibility of slashing, the dry lease of slashing is light, the integrity of a slashing film is high, and the regenerated hairiness is less. The soft and smooth sizing can effectively reduce weaving defects such as starting crosspiece, corrugation, weft yarn breaking and the like during weaving, and realizes high-quality and high-efficiency weaving. And easy desizing cleaning. The slurry formula comprises: JD-L Low sizing: 75Kg, solid content of the supply barrel: 7.8 percent. The temperature of the pulp tank is (92 +/-3) DEG C, and the viscosity of the pulp tank is 7.5 s; the sizing speed is (80 +/-5) m/min; the main grouting pressure is 33kN, the sizing speed: 80 m/min; the unwinding tension is 750N, the dry yarn tension is 3400kN, the winding tension is 4800kN, and the yarn supporting tension is 3900N; the sizing rate is (8 +/-1)%, the slashing moisture regain is (8 +/-0.5)%, and the slashing elongation is less than or equal to 1.0%.

Step c, drawing-in process

The reed number for drawing-in is 93.5#/2in, the drawing-in width is 274.4cm, and the ground structure is as follows: 3, reed entering/reeding; and (3) edge organization: 4 in/reed, ground weave drafting: 23456, selvage organization drafting: 1212, 6 pages of heddle weaving are shared.

Step d, weaving step

The Jintian colt ZAX-9100 type broad-width air jet loom is selected, the air jet loom is a shuttleless loom which adopts jet air to pull weft yarns to pass through a shed, air is used as a weft insertion medium, the jet compressed air generates friction traction force on the weft yarns to pull the weft yarns, the weft yarns are taken through the shed, and the weft insertion purpose is achieved through jet flow generated by air jet. However, if the air velocity is too high, the traction force on the weft yarn is too large, so that the weft yarn is too high in weft insertion tension, and the weft yarn is blown off when meeting a weak loop (low strength, poor evenness and weak cohesive force) of the weft yarn.

In order to improve the weft insertion speed and improve the cloth cover quality of an air jet loom, a single-color fabric is generally woven by double main nozzles, yarn-dyed varieties are woven by 4-8 main nozzles, and when one nozzle sprays weft yarns, certain pressure (normal spraying pressure) needs to be kept in other main nozzles to ensure that the weft yarns are kept in a straight state and the weft yarns are not separated from the nozzle. Under the action of normal jet pressure, the longer the static time is, and the weaker the cohesive force of the weft yarns is, the weft yarns are easy to blow apart or blow away, weft missing and inconsistent upper and lower hand styles are easy to occur during weaving, and huge loss is brought to a factory.

The weft yarn is J14.5tex super-soft yarn and is characterized by low twist which is 22 percent lower than that of normal ring spinning with the same number, low single yarn strength and low resultant yarn cohesive force, and a low-tension weft insertion weaving technology is adopted in a loom. Through technical transformation, the jet flow form and the jet range are regulated and controlled, air pressure control is enhanced, and low-tension weft insertion is realized. The main nozzle and the auxiliary main nozzle adopt energy-saving main nozzles, the lengthened guide bobbins of the energy-saving main nozzles are beneficial to increasing the action length of airflow and weft yarns, measures such as properly reducing the distance between the auxiliary nozzles and the like are taken, the main nozzle pressure can be reduced by 25 percent, and the damage of high pressure of the air jet to the weft yarns is greatly reduced. By adopting the quincunx main nozzle core, the normal production frequent spray pressure is reduced to zero, and the difficult problem that the low-twist super-soft yarn is easy to blow off and blow away by the normal spray pressure is solved.

The weaving machine adopts a weaving process of slightly higher back beams, late opening and large tension, adopts the dropper with the mass of 2 grams, and reduces the damage to the yarns during the contact of the dropper and the warps as much as possible. The specific process parameters are as follows: the vehicle speed is 500r/min, and the machine tension is (3900 +/-300) N; the height of the back beam is 80mm-6 grids, the height of the warp stopping frame is 40mm-6 grids, and the height of the heald frame is as follows: 75/2, open arm L position: 9/8/8/7/6/5, opening time 300 °; the weft insertion time is 70-230 degrees; the air pressure of the main nozzle is 0.30MPa, and the air pressure of the auxiliary nozzle is 0.35 MPa; the opening and closing time of the main nozzle is 76-180 degrees; the auxiliary nozzles are divided into 6 groups and 4 auxiliary nozzles in each group, the opening and closing time of the 1 st group is 76-166 degrees, the opening and closing time of the 2 nd group is 110-190 degrees, the opening and closing time of the 3 rd group is 130-220 degrees, the opening and closing time of the 4 th group is 150-240 degrees, the opening and closing time of the 5 th group is 170-260 degrees and the opening and closing time of the 6 th group is 190-280 degrees.

Step e, post-finishing Process

The after-finishing process does not include the step of performing flexible finishing by using a softening agent, and specifically, the following steps can be preferably performed.

The after-finishing process flow comprises the following steps:

blank inspection → sewing head → enzyme desizing → rinsing → drying → singeing → rinsing → pre-shaping → mercerizing → dyeing → drying → shaping → inspection → packaging and delivery

The specific enzyme desizing adopts a biological enzyme treatment process:

during after finishing, a process of desizing and singeing is adopted, so that the hand feeling of the fabric is effectively improved; adopts cellulose biological enzyme treatment process. Firstly, alkaline pectinase pretreatment is carried out to partially remove hydrophobic impurities on the surface of cotton fibers, and then acid cellulase is used for final treatment to enhance the hydrolysis of cellulose so as to better remove the hydrophobic impurities.

Example 8 was tested for ultra-flexibility

The super-flexibility is tested by using a Fengbao instrument, and according to a Q/320691KDA56 detection method, the super-flexible pure cotton product developed in the embodiment 8 reaches the highest 7-level standard of the home textile requirement; the standard of qualified softness is more than or equal to 86, after 20 times of washing, the detection result of the super-soft product in the factory is 87.65, and the product is qualified.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The pure cotton super-soft yarn is characterized by comprising a super-soft yarn body; the ultra-soft yarn body is made of pure cotton yarn; the ultra-soft yarn body comprises core yarn and wrapping yarn; the wrapping yarn is a twisted fiber strand spirally wrapped outside the core yarn; the twist factor of the super-soft yarn body is 260-300.

2. The pure cotton ultra-soft yarn according to claim 1, wherein the core yarn is a 7.3tex single yarn.

3. The pure cotton ultra-soft yarn of claim 2, wherein the ultra-soft yarn body is made of an Australian cotton fiber; the length of the Australian cotton fiber is 26-35 mm.

4. The pure cotton ultra-soft yarn of claim 3, wherein the ultra-soft yarn body is 14.5 tex.

5. A production process of pure cotton super-soft yarn is characterized by comprising the following steps:

step 2, combing process;

step 4, roving;

6. The process for producing a pure cotton ultra-soft yarn according to claim 5,

in the step 1, an opener, a scutcher and a carding machine are adopted to operate in sequence, and the beating speed of the opener is controlled at 580 revolutions per minute; the speed of a carding needle roller of the scutcher is controlled to be 720 r/min, and the space between an adjusting plate and the roller is 9.6 mm; the cylinder speed of the carding machine is controlled at 420 r/min, the speed of the licker-in is 860 r/min, the output speed of the raw sliver is 110m/min, and the cover plate speed is 195 mm/min;

7. The process for producing a pure cotton ultra-soft yarn according to claim 5,

step 5, arranging an air suction device before twisting the strands, and controlling negative pressure to gather and cohere loose fibers, wherein the fibers are fully straightened in a negative pressure region, and the negative pressure of the gathering is controlled to be-1000 Pa to-3000 Pa; during the spinning process, the temperature of a workshop is controlled to be 28-30 ℃, and the relative humidity is controlled to be 60-65%; the total draft is 68 times, the draft in the back zone is 1.136 times, the roller gauge is 18mm x 32mm, the spindle speed is 12500 rpm, the rotating speed of the front roller is 220 rpm, and the twist factor is controlled at 260-300.

8. The process for producing a pure cotton ultra-soft yarn according to claim 5, further comprising step 6, a spooling process; an automatic winder is adopted, the winding speed is 800m/min, neps are 3.2, the short and thick parts are DS1.65 LS1.3cm, the long and thick parts are DS1.2 LL40cm, the detail D is-15% 30cm, and the winding tension is controlled to be 14-18.

9. An ultra-soft bedding fabric is characterized by comprising a fabric body; the fabric body takes the super-soft yarn body as warp and weft, the warp density of the fabric body is 614/10 cm, the weft density of the fabric body is 354/10 cm, and the fabric body adopts a weave structure of 5/3 tribute satin.

10. The production process of the super-soft bedding fabric is characterized by comprising the following steps:

step a, warping; warping by a warping machine in batches;

step d, weaving process; weaving by adopting a wide air jet loom;