阅读说明：本技术 Sorona双组份复合长丝筒子纱的染色前处理工艺 (Dyeing pretreatment process of Sorona two-component composite filament cheese ) 是由 陈鑫涛 唐文君 姚金龙 孙月玲 向中林 杨正华 蒋龙宇 于 2019-08-27 设计创作，主要内容包括：Sorona双组份复合长丝筒子纱的染色前处理工艺,属于筒子纱的染色技术领域。先将Sorona双组份复合长丝加捻后络筒在大直径筒壳上,然后将小直径筒壳放置在大直径筒壳上方,通过向小直径筒壳施加下向的作用力,推出大直径筒壳,使Sorona双组份复合长丝缠绕在小直径筒壳上,取得染前筒子纱。本发明使松散的纤维在径向上受到拉伸的作用力,纤维之间相互抱合,减少纤维松散程度,提升纤维抱合力,从而减少纱线与纱线之间纤维的粘搭现象的发生。采用转移法络筒的方法可提高小直径筒壳上筒子纱的密度,保证PET和PTT两种纤维不会发生粘搭引起破丝,便于生产,提高布面质量。(A dyeing pretreatment process of Sorona two-component composite filament cheese belongs to the technical field of cheese dyeing. Twisting the Sorona bicomponent composite filament, winding the twisted Sorona bicomponent composite filament on a large-diameter cylindrical shell, then placing a small-diameter cylindrical shell above the large-diameter cylindrical shell, applying downward acting force to the small-diameter cylindrical shell, pushing out the large-diameter cylindrical shell, winding the Sorona bicomponent composite filament on the small-diameter cylindrical shell, and obtaining the pre-dyeing cylindrical yarn. The invention leads the loose fibers to be subjected to the tensile acting force in the radial direction, the fibers are mutually clasped, the loose degree of the fibers is reduced, and the clasping force of the fibers is improved, thereby reducing the bonding phenomenon of the fibers between yarns. The adoption of the transfer spooling method can improve the density of cheese on a small-diameter bobbin shell, ensure that two fibers of PET and PTT are not bonded to cause yarn breakage, facilitate production and improve the quality of cloth cover.)

The dyeing pretreatment process of the Sorona two-component composite filament cheese is characterized by comprising the following steps of: twisting the Sorona bicomponent composite filament, winding the twisted Sorona bicomponent composite filament on a large-diameter cylindrical shell, then placing a small-diameter cylindrical shell above the large-diameter cylindrical shell, applying downward acting force to the small-diameter cylindrical shell, pushing out the large-diameter cylindrical shell, winding the Sorona bicomponent composite filament on the small-diameter cylindrical shell, and obtaining the pre-dyeing cylindrical yarn.

2. The dyeing pretreatment process of the Sorona bicomponent composite filament cheese according to claim 1, characterized in that: the twist of the twisted Sorona bicomponent composite filament is 100-500 twists/m.

3. The dyeing pretreatment process of the Sorona bicomponent composite filament cheese according to claim 2, characterized in that: the density of the cheese before dyeing is 0.27 +/-0.01 g/cm³。

Technical Field

The invention belongs to the technical field of cheese dyeing.

Background

PET, i.e. polyester, is a synthetic fiber, which is a fiber prepared by spinning and post-processing a fiber-forming high polymer, polyethylene terephthalate, which is prepared by esterification or ester exchange and polycondensation reactions of raw materials of poly (terephthalic acid) (PTA) or dimethyl terephthalate (DMT) and ethylene glycol (MEG), and has been widely used in textile production, such as pure polyester fabrics, blended polyester fabrics, core-spun fabrics, etc., because the fiber has permanent flame retardancy.

The english abbreviation of PTT fiber, poly (1.3-propylene-terephthalate) fiber, is a novel polyester fiber made by shell chemical (shell chemical) and du pont, usa polymerizing and spinning PTA and PDO from petroleum process route and bio-corn process route, respectively, with the trade name Corterra, du pont, usa, and chinese: solina.

PDO in the PTT fiber is a key raw material, accounts for 37 percent of the total raw material, and comes from natural renewable resources. The DuPont company in America successfully utilizes a corn sugar fermentation method to efficiently prepare the PDO required by Sorona, so that a new concept of environment-friendly bio-based is revolutionarily injected into the chemical fiber field, and the dependence on petroleum resources is reduced.

In order to fully develop the textile application of PTT fiber, a bicomponent side-by-side composite filament made of two different fibers of 50/50 PET and PTT (Sorona) is available, and is called Sorona bicomponent composite filament in the industry. Because the PET and PTT fibers have different thermal shrinkage rates, a smooth and spiral crimp can be generated, and the crimp generated after the fibers are heated in the dyeing and finishing processes can ensure that fabrics and clothes made of the comfortable stretch yarns have excellent and permanent stretchability and rebound resilience.

the existing two-component parallel composite filament cheese dyeing steps are as follows: spooling, pre-processing yarn boiling, dehydrating, rewinding and dyeing, the process steps are complicated, and the density of the bobbin after rewinding is tight and can only be controlled to be 0.36 +/-0.01 g/cm³and the difference of the thermal shrinkage rates of two PET fibers and PTT fibers is large, and the yarns are severely shrunk by high-temperature and high-pressure treatment in the dyeing process, so that the loose shells are easy to burst and deform. If the density of the loose tube is controlled to be 0.3g/cm³when the yarn is shrunk, the yarns have enough space, but fibers among the yarns are easy to generate the phenomenon of sticking in the shrinking process, so that yarn breakage affects the subsequent production, and yarn breakage and yarn exposure of a cloth cover can be caused.

disclosure of Invention

Aiming at the phenomenon that Sorona bicomponent composite filament shrinks violently in the dyeing process, the invention provides a dyeing pretreatment process of Sorona bicomponent composite filament cheese, which can ensure normal production and improve the cloth cover quality.

the technical scheme of the invention is as follows: twisting the Sorona bicomponent composite filament, winding the twisted Sorona bicomponent composite filament on a large-diameter cylindrical shell, then placing a small-diameter cylindrical shell above the large-diameter cylindrical shell, applying downward acting force to the small-diameter cylindrical shell, pushing out the large-diameter cylindrical shell, winding the Sorona bicomponent composite filament on the small-diameter cylindrical shell, and obtaining the pre-dyeing cylindrical yarn.

The warp yarns in the warping process or the weft yarns in the weaving process need to be unwound, and the Sorona bicomponent composite filament yarns can be broken due to the fact that fibers are bonded and lapped among the yarns in the unwinding process. Therefore, loose fibers are subjected to tensile acting force in the radial direction by the method of increasing the yarn twist, the fibers are mutually occluded, the fiber loosening degree is reduced, and the fiber cohesive force is improved, so that the bonding phenomenon of the fibers between the yarns is reduced.

in addition, the invention firstly uses the large-diameter bobbin shell for spooling, and then transfers the yarns on the large-diameter bobbin shell to the small-diameter bobbin shell in a mechanical mode, the method for spooling by adopting the transfer method can improve the density of the bobbins on the small-diameter bobbin shell, reserve a contraction space for the subsequent dyeing process, ensure that the shrinkage of the bobbins does not cause the deformation of the bobbin shell, ensure that two fibers of PET and PTT are not bonded to cause yarn breakage, so that the production can be normally carried out, and the quality of the cloth cover is improved.

Furthermore, the twist of the twisted Sorona bicomponent composite filament is 100-500 twists/m. When the verification of the repeated test proves that: if the twist is less than 100 twists/m, the yarns still have the phenomenon of sticking in the unwinding process; if the twist is more than 500 twists/m, the effect and the hand feeling presented by the cloth cover are not ideal, so the twisted Sorona bicomponent composite filament has the process requirement of 100-500 twists/m, not only meets the production requirement, but also meets the requirement of customers on the quality of the cloth cover.

The density of the cheese before dyeing is 0.27 +/-0.01 g/cm³. If the loose tube density is too high, the Sorona bicomponent composite filament can be severely contracted under the action of high temperature, the tube shell is deformed, the yarns are bonded, the rewinding is not facilitated, and the phenomena of uneven dyeing and the like can also occur. If the loose bobbin density is too low, the cheese can slide off the bobbin shell, dyeing is not facilitated, and the risk of uneven dyeing also exists, and through multiple tests, the cheese density of 0.27 +/-0.01 g/cm3 reserves enough shrinkage space of the Sorona bicomponent composite filament, ensures the appearance quality of the cheese, and is beneficial to subsequent production.

Detailed Description

Firstly, presetting:

1. The blended yarn was wound on an aluminum bobbin at HKV101C winder.

In order to adapt to the production of a twisting machine, a bicomponent composite filament tube formed by blending 50/50 PET and PTT (Sorona) is placed on a primary yarn spindle seat, and a yarn tail sequentially passes through a yarn guide hook, a yarn guide porcelain eye, a yarn cleaning gauge, a tensioner, a yarn guide porcelain eye and a yarn guide rod and then is wound on an aluminum bobbin.

And starting the machine to wind the composite filament on the aluminum bobbin.

2. Twisting the composite filament on the aluminum bobbin.

And stranding the composite filaments on the aluminum bobbin by a two-for-one twister to increase the twist, so as to obtain the composite filaments with the twist of 100-500 twists/m.

Secondly, preparing the cheese before dyeing:

1. And winding the twisted composite filament onto a large-diameter bobbin shell.

The height of the adopted large-diameter cylinder shell is 18cm, and the diameter of the adopted large-diameter cylinder shell is 12 cm.

the large diameter can was placed on a De one winder with a single can weight of 0.5 kg/can (without can weight), a set length of 54000 meters, a vehicle speed of 500m/min, and a tension of 0.

2. The composite filaments were mechanically transferred to a small diameter bobbin shell.

And (2) placing a small-diameter bobbin case (namely a conventional bobbin case) with the diameter of 6.5cm and the height of 18cm above the large-diameter bobbin case, applying downward pressure to the upper part of the small-diameter bobbin case by utilizing a mechanical extrusion device, pushing the small-diameter bobbin case downwards out of the large-diameter bobbin case, and automatically winding the composite filaments on the small-diameter bobbin case to obtain the pre-dyeing bobbin yarn.

The density of the obtained cheese before dyeing is 0.27 +/-0.01 g/cm through testing³。

Thirdly, dyeing:

1. The dye formula comprises:

(1) Formula 1:

the degreasing agent is prepared by mixing degreasing agent and water, wherein the content of the degreasing agent is 1 g/L.

(2) And (2) formula:

The dye is prepared by mixing disperse dye, glacial acetic acid, sodium acetate, 1011 leveling agent and water, and the weight ratio of each component is as follows: 3% of disperse dye, 0.8g/L of glacial acetic acid, 1.2g/L of sodium acetate and 1g/L of 1011 leveling agent.

2. The process comprises the following steps:

(1) Placing the formula 1 in a No. 1 dye vat, heating the formula 1 in the No. 1 dye vat to 90 ℃, placing the cheese in the dye vat for treatment for 15min, wherein the bath ratio of the cheese to the dye before dyeing is 1: 10.

(2) Placing the formula 2 in a No. 2 dye vat, wherein the formula 2 in the No. 2 dye vat is at normal temperature, placing the cheese taken out from the No. 1 dye vat into the No. 2 dye vat for treatment for 5min, then heating the formula 2 in the No. 2 dye vat to 90 ℃ at the heating speed of 3 ℃/min for treatment for 5min, then heating to 110 ℃ at the heating speed of 0.6 ℃/min for treatment for 10 min, and finally heating to 130 ℃ at the heating speed of 1 ℃/min for treatment for 30min to obtain the dyed cheese.

fourthly, rewinding:

1. And dehydrating the dyed cheese through a dehydrator.

2. And (5) placing the dehydrated cone on an SSM-TW2 rewinding machine for rewinding at the speed of 800 m/min.

After rewinding, 75D and 50/50 PET and PTT (Sorona) bicomponent composite filament yarn is obtained and can be used as subsequent yarn for loom production.

Fifthly, weaving:

Example 1: specification requirements of the finished interwoven fabric are as follows: 50S all cotton yarn is taken as warp direction, the bicomponent composite filament yarn is taken as weft direction, and the weaving density is 150 multiplied by 80 threads/inch.

The following table shows the results obtained with the above process of the invention compared with the results obtained with the conventional process:

Type of process	Conventional process	The process of the invention
			density of windings	0.36±0.01g/cm3	0.27±0.01g/cm3
Rewinding breakage rate	35 times per 54000 m	1-2 times per 54000 m
			Quality of grey cloth cover	Broken yarn and exposed yarn of cloth surface	The cloth surface is bright, clean and smooth
Finished product 30min elongation [ ASTM D3107-09a (2015)]	8.1%	21.2%
			Finished product 30min recovery [ ASTM D3107-09a (2015)]	82.1%	81.7%
Finished product 30min residual elongation [ ASTM D3107-09a (2015)]	1.1%	3.4%

Example 2: specification requirements of the finished interwoven fabric are as follows: the bicomponent composite filament yarn is adopted as warp and weft respectively, and the weaving density is 200 multiplied by 100 per inch.

The following table shows the results obtained with the above process of the invention compared with the results obtained with the conventional process:

Remarking: the above "ASTM D3107-09a (2015)" is the test method standard for tensile properties of fabrics for stretch yarn machines set by the American society for testing materials ASTM.

As can be seen from the two tables, the Sorona bicomponent composite filament adopts a pretreatment method for increasing the yarn twist to solve the problem of fiber bonding between yarns, and a large-diameter bobbin shell bobbin can reserve enough space for yarn shrinkage during dyeing, so that the problem of bobbin shell deformation after dyeing is solved, the rewinding efficiency of cheese can be solved, the cloth cover quality is improved, and meanwhile, the elastic loss can be reduced. In addition, the elongation of the finished product is obviously higher than that of the traditional product, which shows that the process can more remarkably show the high elasticity characteristic of the Solona fiber.