Preparation method of regenerated nylon floating white air covered yarn

Abstract

The present application relates to the technical field of air covered yarn, and particularly relates to a preparation method of regenerated polyamide (PA) floating white air covered yarn. Specifically, the method comprises the following steps: spinning regenerated PA POY filament by using regenerated environment-friendly chip raw material; regularly performing different stretching treatments on the prepared regenerated PA POY filament on an air covering integrated machine, so that the filament has multiple different crystal bodies on the same filament; and obtaining a regenerated PA floating white air covered yarn by using the filament and spandex prepared on the air covering integrated machine. The PA air covered yarn manufactured by using the regenerated environment-friendly chip as the raw material can not only meet the demand of weaving and cloth making, but also protect the environment and prevent overexploitation of fossil resources on the earth. The elasticizer modification breaks through the problem that a single yarn has different dyeing sections, so that the subsequent weaving and cloth making have the effect of double-color floating white.

Description

Technical Field

[0001] This invention relates to the technical field of air-coated yarns, and particularly to a method for preparing recycled nylon air-coated yarns with whitening. Background Technology

[0002] Driven by increasing consumer demand for environmentally friendly products, recycled nylon fiber has seen further development. As a type of recycled fiber, recycled nylon covered yarn products are relatively limited in variety, mostly concentrated on the production of conventional varieties, far behind the level of domestic polyester factories. Nylon has better hydrophilicity, abrasion resistance, and colorfastness than polyester, making it more suitable for use in close-fitting clothing. To expand product diversity, two-tone products are an important development direction.

[0003] Currently, to achieve the dual-color function, polyester and nylon are usually used as two different raw materials. Specifically, the two-color effect after dyeing is obtained by false twisting the two raw materials with different properties. The biggest drawbacks of this technology are: (1) the spinning of dual-color yarn is poor and the cost of using conventional POY is relatively high and it does not have environmental protection attributes; (2) achieving dual-color requires a combination of two raw materials, which are basically filaments, and the fineness and elasticity of the product are limited; (3) the limited elasticity is not conducive to reducing the cost of subsequent production and product development. Based on these shortcomings, and in order to meet market demand, reduce production costs, increase profit growth points, improve product competitiveness and economic benefits, it is necessary to develop a new method for preparing recycled nylon floating white air-coated yarn that can achieve dual-color function.

[0004] In the process of developing and designing two-color yarns, there are corresponding shortcomings in spinnability and the performance of two colors. In particular, when using recycled nylon materials, the contrast effect of two colors is not obvious and the color difference is not significant, resulting in insufficient performance of two colors. Summary of the Invention

[0005] The purpose of this invention is to solve the problems existing in the current two-color fabrics that are usually made of polyester and nylon, and to provide a method for preparing recycled nylon air-coated yarn.

[0006] Specifically, the present invention adopts the following technical solution:

[0007] A method for preparing recycled nylon air-coated yarn includes the following steps:

[0008] (1) Recycled nylon POY filaments are prepared by spinning recycled environmentally friendly chip raw materials; specifically including:

[0009] Spinning: The diced raw material is fully melted and homogenized using a German Barmag screw extruder. The temperature of each section of the screw extruder is set between 255-280℃, and the screw pressure is 115~125 kg / cm². 2 The screw speed is 40~45 r / min, and the melt spinning temperature is 255~268℃;

[0010] Side-blowing cooling: air temperature 20-28℃, humidity 90-95%, air velocity 0.5-0.55m / s;

[0011] Oiling and bundling: The fibers cooled by side blowing are oiled and bundled through the oil nozzle; the oiling agent used is 8% nylon oiling agent pure water emulsion;

[0012] Winding: The oiled filament bundle passes through the pre-networker, guide disc, and main networker to the winding, with a winding speed of 4100-4200m / min, to obtain a stable quality recycled nylon POY filament.

[0013] (2) The prepared recycled nylon POY filaments are subjected to different stretching treatments in a regular manner on an air-packing machine, so that they have multiple segments of different crystals on the same filament; and the specific parameters of the air-packing machine for spandex are as follows:

[0014] The machine speed is 600 m / min, the draw ratio DR of recycled nylon POY filament is 1.22-1.35, the ratio of false twister speed to nylon POY filament running speed DY is 1.6-1.65, the temperature of the hot box when the nylon POY filament passes through the hot box is 175-180℃, the false twister is 1-5-1, the spandex draw ratio is 3.5, and the network pressure is 4.3.

[0015] Preferably, the recycled environmentally friendly chip raw material is prepared from a modified blend, which includes a recycled polyamide base material and a modified masterbatch; the percentage of the recycled polyamide base material is 91-98%, and the percentage of the modified masterbatch is 2-9%; the recycled polyamide base material is prepared from recycled polyamide, and the modified masterbatch includes the following components by weight: 50 parts of polyamide base material, 5-10 parts of bismuth nitrate, 1-3 parts of yttrium oxide, 5-8 parts of nano titanium dioxide, and 2-5 parts of other additives.

[0016] Because this variety has high requirements for fiber raw materials, the spinnability of recycled nylon needs to be studied during spinning. To facilitate the production of recycled whitened nylon-spandex coated yarn, the raw material for POY production must be reselected as recycled environmentally friendly chips. Therefore, considering the characteristics of recycled environmentally friendly chips, special improvements to the raw materials are necessary. Simultaneously, based on the whitening properties of recycled environmentally friendly chips, their formulation needs to be adjusted accordingly.

[0017] On the other hand, adjustments to the specific processes are also necessary.

[0018] The modified masterbatch used above aims to modify recycled polyamide, improving its spinnability and enhancing the crystallization sensitivity of recycled nylon POY by adding bismuth nitrate and yttrium oxide, thereby further improving the differentiation of whitening. Bismuth nitrate, under light, not only exhibits a photocatalytic effect but also improves the crystallization state of filaments, thus improving the color performance of the fabric. Yttrium oxide improves the dyeing performance of filaments with segmented crystallinity; that is, it improves the adsorption sensitivity of dyes to different degrees of crystallinity, thereby widening the absorption differences of dyes, increasing color differences, and making the whitening effect more pronounced.

[0019] As a preferred option, the empty package integrated machine has different stretching patterns in a regular manner, which is achieved in the following way:

[0020] A grooved roller for adjusting recycled nylon POY filament is set on the empty packaging machine. At the same time, a shift fork device is set to fit and separate the recycled nylon POY filament from the grooved roller. The shift fork device achieves the fit and separation of the recycled nylon POY filament from the grooved part of the grooved roller at a certain reciprocating oscillation frequency.

[0021] Preferably, the grooved roller has one half of its circumferential side surface designated as a reserved area and the other half as a grooved area, with a number of grooved notches spaced apart along the circumferential side surface of the roller in the grooved area.

[0022] When the shifting fork device moves the recycled nylon POY filament into the groove area of ​​the groove roller, part of the recycled nylon POY filament is in contact with the peripheral side of the groove roller, and part of the recycled nylon POY filament is in the groove gap and thus separates from the peripheral side of the groove roller; thus forming an intermittent contact between the recycled nylon POY filament and the roller.

[0023] When the shifting fork device moves the recycled nylon POY filament into the retention area of ​​the grooved roller, the nylon POY filament comes into contact with the peripheral side of the grooved roller.

[0024] Recycled nylon (POY) is oscillating via a fork mechanism, causing the yarn to sometimes enter the grooved area of ​​the grooved rollers, where the yarn is not drawn or has minimal draw, and sometimes undergoes excessive draw on the surface of the ungrooved retention area. The same recycled nylon POY yarn exhibits significant differences in draw between passing through the grooves and not passing through them. This excessive draw results in high crystallinity and molecular weight. After dyeing, the higher crystallinity and molecular weight lead to less dye absorption, creating a whitening effect.

[0025] Preferably, the reciprocating oscillation frequency of the shift fork device for recycled nylon POY filament is 10 times / minute.

[0026] As a preferred option, the screw extruder adopts a multi-stage temperature setting, specifically a five-stage heating method. The extruder is divided into five sections from the inlet to the outlet, with the length ratio of the five sections being 1:2:2:3:1. The temperatures of each section are as follows: Section 1 255-260℃, Section 2 265-270℃, Section 3 275-280℃, Section 4 265-270℃, and Section 5 260-270℃.

[0027] Ideally, the oiling rate should be 2-2.5%.

[0028] This invention utilizes a fork-like device. The principle is that during the texturing and drafting process of nylon POY, the nylon POY oscillates back and forth via the fork device. This causes the nylon POY to sometimes enter the grooved rollers without being drafted, and at other times to achieve super-drafting on the ungrooved surface. The amplitude and frequency of the oscillation are controlled by a PLC. Thus, the same nylon POY exhibits significant variations in drafting when passing through grooves and not through grooves. Super-drafting results in high crystallinity and molecular weight. After dyeing, due to the higher crystallinity and molecular weight, less dye is absorbed, creating a whitening effect.

[0029] The beneficial effects of this invention are:

[0030] Using recycled and environmentally friendly chips as raw materials, the nylon-ammonia air-coated yarn can not only meet the needs of weaving and clothing, but also protect the environment and prevent the over-exploitation of the earth's fossil resources.

[0031] By modifying the texturing machine, the problem of different dyeing sections appearing on a single yarn was solved, enabling the fabric woven in the later stage to have a two-color floating white effect.

[0032] The prepared recycled white-coated yarn can be fed into the circular knitting machine in one go, and the product solves the problem of needing to add spandex separately for the two-color elastic fabric of the circular knitting machine.

[0033] The successful development of recycled white-coated yarn has given consumers and downstream garment manufacturers more choices for environmentally friendly colored products, increasing the market share of recycled environmentally friendly fibers. Detailed Implementation

[0034] The representative embodiments shown will now be further refined. It should be understood that the following description is not intended to limit the embodiments to a single preferred embodiment. Rather, it is intended to cover alternatives, modifications, and equivalents that may be included within the substance and scope of the embodiments defined by the appended claims.

[0035] In the following detailed description, although these embodiments are described in sufficient detail to enable those skilled in the art to implement them, it should be understood that these examples are not limiting, allowing the use of other examples and corresponding modifications that can be made without departing from the spirit and scope of the embodiments.

[0036] Example 1:

[0037] A method for preparing recycled nylon air-coated yarn includes the following steps:

[0038] (1) Recycled nylon POY filaments were prepared by spinning recycled environmentally friendly chip raw materials;

[0039] The recycled environmentally friendly chip raw material is prepared from a modified blend, which includes a recycled polyamide base material and a modified masterbatch; the percentage of recycled polyamide base material is 91%, and the percentage of modified masterbatch is 9%; the recycled polyamide base material is prepared from recycled polyamide, and the modified masterbatch includes the following components by weight: 50 parts polyamide base material, 10 parts bismuth nitrate, 3 parts yttrium oxide, 8 parts nano titanium dioxide, and 5 parts other additives;

[0040] The specific process for preparing recycled nylon POY filament includes:

[0041] Spinning: The diced raw material is fully melted and homogenized using a German Barmag screw extruder. The temperature of each section of the screw extruder is set between 255-280℃, and the screw pressure is 115~125 kg / cm². 2 The screw speed is 40~45 r / min, and the melt spinning temperature is 255~268℃. The screw extruder adopts a multi-stage temperature setting, specifically a five-stage heating method. The inlet to outlet is divided into five sections, with the length ratio of the five sections being 1:2:2:3:1. The temperatures of each section are as follows: Section 1 255-260℃, Section 2 265-270℃, Section 3 275-280℃, Section 4 265-270℃, and Section 5 260-270℃.

[0042] Side-blowing cooling: air temperature 20-25℃, humidity 90-92%, air velocity 0.5-0.55m / s;

[0043] Oiling and bundling: The fibers cooled by side blowing are oiled and bundled through the oil nozzle; the oiling agent used is 8% nylon oiling agent pure water emulsion;

[0044] Winding: The oiled filament bundle passes through the pre-networker, guide disc, and main networker, and is then wound at a speed of 4100-4200 m / min to obtain high-quality recycled nylon POY filament with a specification of 93 dtex / 48f; the oiling rate is 2%.

[0045] (2) Using the prepared recycled nylon POY filament with specifications of 93dtex / 48f and 40D spandex, different stretching treatments were carried out in a regular manner on an air-packing machine so that it had multiple different crystals on the same filament. The specific parameters of the air-packing machine are as follows: the machine speed is 600 m / min, the stretching ratio DR of the recycled nylon POY filament is 1.22-1.35, the ratio of the speed of the false twister to the running speed of the nylon POY filament is 1.6-1.65, the temperature of the hot box when the nylon POY filament passes through the hot box is 175-180℃, the false twister is 1-5-1, the spandex stretch ratio is 3.5, and the network pressure is 4.3.

[0046] The empty package machine has different stretching patterns in a regular manner, which is achieved in the following way:

[0047] A grooved roller for adjusting recycled nylon POY filament is set on the empty package machine. At the same time, a shift fork device is set to fit and separate the recycled nylon POY filament from the grooved roller. The shift fork device achieves the fit and separation of the recycled nylon POY filament from the grooved part of the grooved roller at a reciprocating oscillation frequency of 10 times / minute.

[0048] The grooved roller has a reserved area on one half and a grooved area on the other half of its circumferential side. The grooved area is provided with several grooved notches spaced apart along the circumferential side of the roller.

[0049] When the shifting fork device moves the recycled nylon POY filament into the groove area of ​​the groove roller, part of the recycled nylon POY filament is in contact with the peripheral side of the groove roller, and part of the recycled nylon POY filament is in the groove gap and thus separates from the peripheral side of the groove roller; thus forming an intermittent contact between the recycled nylon POY filament and the roller.

[0050] When the shifting fork device moves the recycled nylon POY filament into the retention area of ​​the grooved roller, the nylon POY filament comes into contact with the peripheral side of the grooved roller.

[0051] Example 2: Based on Example 1, the recycled environmentally friendly chip raw material is prepared from a modified blend, which includes a recycled polyamide base material and a modified masterbatch; the percentage of recycled polyamide base material is 98%, and the percentage of modified masterbatch is 2%; the recycled polyamide base material is prepared from recycled polyamide, and the modified masterbatch includes the following components by weight: 50 parts polyamide base material, 5 parts bismuth nitrate, 1 part yttrium oxide, 5 parts nano titanium dioxide, and 2 parts other additives.

[0052] The above embodiments are based on the technical solution of the present invention. Specifically, using recycled environmentally friendly chips as raw materials, the manufactured nylon-spandex air-covered yarn not only meets the needs of fabric weaving and garment making, but also protects the environment and prevents the over-exploitation of the earth's fossil resources; the improvement of the texturing machine has broken through the problem of different dyeing sections in a single yarn, enabling the fabric woven in the later stage to have a two-color floating white effect; the prepared recycled floating white covered yarn can be fed into the circular knitting machine in one go, and the product solves the problem of needing to add spandex separately for two-color elastic fabrics made by circular knitting machines; the successful development of the prepared recycled floating white covered yarn gives consumers and garment factories more choices for environmentally friendly colored products, and increases the market share of recycled environmentally friendly fibers.

[0053] For ease of explanation, specific naming has been used in the above description to provide a thorough understanding of the described embodiments. However, it will be apparent to those skilled in the art that these specific details are not required to implement the above embodiments. Therefore, the above description of the specific embodiments described herein is presented for illustrative and descriptive purposes. Its purpose is not to exhaustively list or limit the embodiments to the specific, precise forms disclosed. It will be apparent to those skilled in the art that certain modifications, combinations, and variations can be made based on the above teachings.

Claims

1. A method for preparing recycled nylon air-coated yarn, characterized by comprising the following steps: (1) Prepare recycled nylon POY filament by spinning recycled environmentally friendly chip raw materials; the specific steps include: Spinning: The diced raw material is fully melted and homogenized using a German Barmag screw extruder. The temperature of each section of the screw extruder is set between 255-280℃, and the screw pressure is 115~125 kg / cm². 2 The screw speed is 40~45 r / min, and the melt spinning temperature is 255~268℃; Side-blowing cooling: air temperature 20-28℃, humidity 90-95%, air velocity 0.5-0.55m / s; Oiling and bundling: The fibers cooled by side blowing are oiled and bundled through the oil nozzle; the oiling agent used is 8% nylon oiling agent pure water emulsion; Winding: The oiled filament bundle passes through the pre-networker, guide disc, and main networker to the winding, with a winding speed of 4100-4200m / min, to obtain a stable quality recycled nylon POY filament. (2) Using the prepared recycled nylon POY filament and spandex, different stretching treatments are carried out in a regular manner on an air-packing machine so that the same filament has multiple different crystals. The specific parameters of the empty package integrated machine are as follows: At a vehicle speed of 600 meters per minute, the draw ratio (DR) of recycled nylon POY filament is: The ratio of the speed of the false twister to the speed of the recycled nylon POY filament is 1.22-1.35, the DY ratio is 1.6-1.65, the temperature of the hot box when the nylon POY filament passes through the hot box is 175-180℃, the false twister is 1-5-1, the spandex pull ratio is 3.5, and the network pressure is 4.

3. The recycled environmentally friendly chip raw material is prepared from a modified blend; the modified blend includes recycled polyamide base material and modified masterbatch; the percentage of recycled polyamide base material is 91-98%, and the percentage of modified masterbatch is 2-9%; the recycled polyamide base material is prepared from recycled polyamide, and the modified masterbatch includes the following components by weight: 50 parts of polyamide base material, 5-10 parts of bismuth nitrate, 1-3 parts of yttrium oxide, 5-8 parts of nano titanium dioxide, and 2-5 parts of other additives.

2. The method for preparing recycled nylon air-coated yarn according to claim 1, characterized in that: The empty package machine performs different stretching operations in a regular pattern, specifically achieved in the following way: A grooved roller for adjusting recycled nylon POY filament is set on the empty packaging machine. At the same time, a shift fork device is set to fit and separate the recycled nylon POY filament from the grooved roller. The shift fork device achieves the fit and separation of the recycled nylon POY filament from the grooved part of the grooved roller at a certain reciprocating oscillation frequency.

3. The method for preparing recycled nylon air-coated yarn according to claim 2, characterized in that: The grooved roller has a reserved area on one half and a grooved area on the other half of its circumferential side. The grooved area has several grooved notches spaced apart along the circumferential side of the roller. When the shifting fork device moves the recycled nylon POY filament into the groove area of ​​the groove roller, part of the recycled nylon POY filament is in contact with the peripheral side of the groove roller, and part of the recycled nylon POY filament is in the groove notch and thus separates from the peripheral side of the groove roller. This results in an intermittent bonding between recycled nylon POY filament and the roller; When the shifting fork device moves the recycled nylon POY filament into the retention area of ​​the grooved roller, the nylon POY filament comes into contact with the peripheral side of the grooved roller.

4. The method for preparing recycled nylon air-coated yarn according to claim 2, characterized in that: The fork mechanism reciprocates at a frequency of 10 times per minute for recycled nylon POY filament.

5. The method for preparing recycled nylon air-coated yarn according to claim 1, characterized in that: The screw extruder adopts a multi-stage temperature setting, specifically a five-stage heating method. The extruder is divided into five sections from the inlet to the outlet, with the length ratio of the five sections being 1:2:2:3:

1. The temperatures of each section are as follows: Section 1 255-260℃, Section 2 265-270℃, Section 3 275-280℃, Section 4 265-270℃, and Section 5 260-270℃.

6. The method for preparing recycled nylon air-coated yarn according to claim 1, characterized in that: The oiling rate is 2-2.5%.