CN114000207B - Intelligent production method, equipment, control device and readable carrier medium for colored regenerated low-melting-point fibers - Google Patents
Intelligent production method, equipment, control device and readable carrier medium for colored regenerated low-melting-point fibers Download PDFInfo
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
- D01D5/30—Conjugate filaments; Spinnerette packs therefor
- D01D5/34—Core-skin structure; Spinnerette packs therefor
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D1/00—Treatment of filament-forming or like material
- D01D1/04—Melting filament-forming substances
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D1/00—Treatment of filament-forming or like material
- D01D1/06—Feeding liquid to the spinning head
- D01D1/065—Addition and mixing of substances to the spinning solution or to the melt; Homogenising
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- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/06—Dyes
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent
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Abstract
The invention relates to the technical field of regenerated polyester fiber production, in particular to an intelligent production method, equipment, a control device and a readable carrier medium for colored regenerated low-melting-point fibers by utilizing the color of waste polyester textiles in situ. The method establishes a color matching database of the colored polyester foam material, carries out multi-element in-situ color matching on the polyester foam material, carries out real-time online monitoring on the color of a melt, carries out color master batch addition through a dynamic mixer to realize online color matching and color compensation, and realizes that the chromatic aberration of the finished product fiber is controlled to be 3-4 grade or above. The colored regenerated low-melting-point fiber prepared by the method has stable quality, can meet the diversified requirements of products, has low production cost, no pollution and strong market competitiveness, can be widely applied to the fields of automotive interiors, mattresses, indoor materials and the like, has an important promotion effect on the development of the textile industry to the green environmental protection direction, and has obvious economic and social benefits.
Description
Technical Field
The invention relates to the technical field of regenerated polyester fiber production, in particular to an intelligent production method, equipment, a control device and a readable carrier medium for colored regenerated low-melting-point fibers by utilizing the color of waste polyester textiles in situ.
Background
The low-melting-point sheath-core composite polyester staple fiber is prepared by distributing two different polymers, namely low-melting-point polyester and conventional polyester, in the same fiber in a sheath-core structure. The skin layer is low-melting polyester, which retains partial characteristics of the conventional polyester and has good compatibility with the conventional polyester. The low-melting-point sheath-core composite fiber is mainly used for thermal bonding fiber, mainly plays a role in the production of non-woven fabrics in that low-melting-point fiber sheath polymer is melted at a certain temperature, so that the bonding effect is achieved in a fiber net, the non-woven fabrics processed by the low-melting-point sheath-core composite fiber in respective forms are good in thickness uniformity, small in thermal shrinkage and free of hard spots, and the low-melting-point sheath-core composite fiber is widely used in the fields of sanitary materials such as medical masks and bandages, indoor decoration materials and the like at present.
The Chinese invention patent (publication number: CN110616474A, published as 20191227) applied by the applicant discloses a method for preparing sheath-core composite low-melting-point regenerated polyester fibers from waste polyester textiles. The method is characterized in that on the basis of effective separation and alcoholysis esterification, after multi-stage filtration, esterification is subjected to low-melting point modification, and then low-melting point polyester used for a low-melting-point skin layer and polyester used for a core layer are respectively obtained through polycondensation, so that continuous operation can be realized, and high-quality skin-core composite low-melting-point regenerated polyester fiber is obtained.
At present, the polyester fiber is mainly dyed in two modes of dope dyeing before spinning and dyeing after spinning. The dope dyeing is that after polyester is melt spun, white fiber is spun, and then the white fiber or white fabric is dyed with dye. And (3) dyeing the dope before spinning, namely adding pigment or dye when preparing the polyester fiber, thereby directly obtaining the polyester colored filament. Compared with dyeing after spinning, the dyeing method of the stock solution before spinning has higher color fastness, and importantly, a large amount of printing and dyeing wastewater is not generated, so that the pollution to the environment is avoided, a large amount of water resources are saved, the current time trend of low-carbon economy, energy conservation and emission reduction is met, and a more green and environment-friendly dyeing method is provided for the chemical fiber industry.
Based on the theme of green manufacture, the regeneration cycle and the colorful dyeing-free are the main development directions of the low-melting point polyester staple fiber. The recycling of the waste polyester not only solves the environmental pollution caused by the use of the polyester, but also realizes the reasonable utilization of resources, and reduces the dependence on a petroleum resource consumption box while protecting the environment. The colored regenerated low-melting-point polyester fiber has the characteristics of low processing cost, less environmental pollution, water saving, low carbon emission and the like, and has an important promotion effect on the development of the textile industry towards the green environmental protection direction.
To this end, the Chinese patent application (publication No. CN110698658A, published: 20200117) of the applicant discloses a method for preparing colored polyester by waste polyester chain decomposition, which comprises the following steps: 1) The recycled waste polyester is pretreated and matched for color matching; 2) Performing a chain decomposition reaction under the action of a chain decomposition catalyst, wherein the temperature of mother liquor is 190-210 ℃, and the reaction time is 30 minutes-5 hours; precipitating and removing impurities from the chain hydrolysate, and performing multi-stage filtration treatment; the filtering precision is sequentially improved, the primary filtering precision is 50-100 meshes, and the final filtering precision is 500-800 meshes; 3) And (4) feeding the chain decomposition product after impurity removal to a polycondensation kettle for pre-polycondensation through color compensation, and finally forming a finished product through final polycondensation. The method can prepare continuous, stable and high-quality colored recycled polyester and realize high-valued recycling of waste polyester. The method can prepare continuous, stable and high-quality colored recycled polyester and realize high-valued recycling of waste polyester. However, the patent does not establish a color matching database of the colored polyester foam, and an intelligent production system is realized.
In addition, the Chinese invention patent (publication number: CN109693905A, published as 20190430) applied by the applicant discloses an intelligent distribution and mixing system and method for polyester reclaimed materials, wherein the system comprises storage bins, a distribution pipeline, a batching bin and an upper computer, each storage bin stores a single variety of reclaimed materials, the distribution pipeline comprises a conveying pipeline, the conveying pipeline is connected with a discharge port of each storage bin and a feeding port of the batching bin, the batching bin is used for containing the mixed reclaimed materials, the upper computer comprises a material discharge calculation module and a distribution control module, the material discharge calculation module is used for obtaining the variety of the needed reclaimed materials and calculating the using amount of each variety of the reclaimed materials according to a production formula and a production plan, then the theoretical material discharge speed of the corresponding storage bin is calculated according to the stacking density of the reclaimed materials of the corresponding storage bin, and the distribution control module is used for adjusting the material discharge speed of the corresponding storage bin and the conveying speed of the conveying pipeline according to the calculated theoretical material discharge speed so that the needed reclaimed materials are simultaneously fed into the batching bins for mixing. The system and the method realize automatic control on classification, storage and conveying of the reclaimed materials. This patent also relates to intelligent delivery of materials only and is directed to intelligent color matching and intelligent color matching.
In addition, chinese patent application (publication No. CN108385198A, published Japanese 20180810) applied by Jiangsu Hengze composite science and technology Limited company discloses a preparation method of colored recycled polyester staple fibers, and the patent adopts an RGB (Red, green, blue and blue) ternary color matching method, so that online automatic color matching compensation is realized during production of colored polyester, and the stability and the accuracy of polyester color matching are improved.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide an intelligent production method of colored regenerated low-melting-point fibers by utilizing the colors of waste polyester textiles in situ, which comprises the steps of establishing a colored polyester foam material color matching database, carrying out multi-element in-situ color matching on polyester foam materials, carrying out real-time online monitoring on the colors of melts, carrying out color master batch addition through a dynamic mixer to realize online color matching and color compensation, and realizing that the chromatic aberration between finished fibers is controlled to be 3-4 grade or above.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for producing colored regenerated low-melting-point fibers by utilizing colors of waste polyester textiles in situ is disclosed, the low-melting-point composite fibers are prepared by taking regenerated colored polyester as a core layer and modified polyester as a skin layer, the method takes the waste polyester textiles as raw materials and adopts a physical and chemical method to prepare the composite fiber core layer, and the method comprises the following steps:
1) Firstly, preparing waste polyester textiles into polyester bubble materials, establishing a color matching database of colored polyester bubble materials, giving the proportion of the colored polyester bubble materials through computer color matching according to the color of target fibers, and selecting an intelligent polyester reclaimed material distribution and mixing system for proportioning and putting;
the method for establishing the color matching database of the colored polyester foam comprises the following steps: respectively melting and molding the colored polyester foam materials into sheets with certain thickness according to different colors, measuring the color by using a color measuring instrument, testing the reflectivity R value of the polyester sheet in the visible light range of 400-700 nm, establishing a curve graph of the R value and the wavelength lambda, and establishing a curve graph of the R value and the wavelength lambda of all used bubble materials;
2) And installing a color measuring instrument in front of the spinning manifold, adding color master batches in a dynamic mixer according to a real-time color measuring result, controlling the color difference between finished fibers to be 3-4 grade or above, and realizing on-line color compensation and color mixing so as to achieve the target fiber color.
The melting point of the core layer regenerated colored polyester is 245-260 ℃; the skin layer is made of low-melting-point polyester, the melting range is 90-180 ℃; the two polyester melts are metered by respective metering pumps and then enter a spinning composite component, and the melts sprayed from a spinneret plate of the composite component are cooled, oiled, bunched, drafted, curled, shaped, cut off and packaged to obtain the sheath-core colored regenerated low-melting-point fiber.
Preferably, the color matching model in the step 1) is a Friele model, and the variable parameters of a Friele model formula are set to be 0.146217-0.157890; the computer color matching algorithm adopts a full spectrum matching algorithm of 400-700 nm; the computer color matching and color difference evaluation adopts the comprehensive evaluation of chroma difference, lightness difference and color difference.
Preferably, the computer color matching and color difference evaluation adopts a CIEDE2000 color difference formula.
Preferably, the color measuring instrument in the step 2) is an online light splitting test instrument, the light source is a pulse xenon lamp, the wavelength range is 340-740 nm, the color measuring instrument is arranged in front of the spinning manifold to monitor the color of the melt in real time, and the color measuring result and the color of the target fiber are subjected to color difference analysis.
Preferably, the dynamic mixer in the step 2) is provided with a main pipe booster gear pump and a color master batch adding gear pump, wherein the color master batch adding gear pump is provided with a frequency converter and can perform stepless speed change according to the supply requirement, and the dynamic mixer sufficiently mixes the polyester melt and the color master batch melt in a short time to realize online color mixing and color complementing.
Preferably, the color master batches all use PET as a carrier, and disperse dye is a colorant.
Preferably, the skin layer takes isophthalic acid and diethylene glycol as modified monomers, and the virgin PET polyester is subjected to low-melting-point copolymerization modification by an esterified product copolycondensation method; wherein, the IPA is PTA = 1.8-1.9, EG is DEG = 4-5:1, the catalyst is antimony trioxide and cobalt acetate, the stabilizer is trimethyl phosphate, the feeding of the catalyst and the stabilizer is 200-600 ppm of the total amount of acid, and the acid is the sum of terephthalic acid and isophthalic acid; the melting range of the polyester on the surface layer is 90-180 ℃.
The intelligent distribution mixing system for the polyester reclaimed materials can adopt the intelligent distribution mixing system and the intelligent distribution method for the polyester reclaimed materials (the patent number is 201811501499.9) invented by Ningbo Dafa chemical fiber company Limited to realize automatic batching and uniform mixing of the colored foam materials.
The invention further discloses equipment for producing colored regenerated low-melting-point fibers by utilizing the colors of waste polyester textiles in situ, which comprises skin layer melt virgin PET polyester modification synthesis equipment, core layer regenerated colored polyester physical and chemical method production equipment and a double-temperature-control composite spinning box body, wherein the core layer regenerated colored polyester physical and chemical method production equipment comprises a computer color matching system, a polyester regenerated material intelligent distribution and mixing system and a dynamic mixer, the computer color matching system is connected to the polyester regenerated material intelligent distribution and mixing system to control the distribution and the feeding of polyester regenerated materials, the dynamic mixer is connected with a color master melt distribution screw rod, and the dynamic mixer is connected to the double-temperature-control composite spinning box body; the double-temperature-control composite spinning manifold is provided with a color measuring instrument, the color measuring instrument collects data and is connected to a computer color matching system, and the computer color matching system is connected with and controls the batching and feeding of a color master melt batching screw rod;
the computer color matching system establishes a colored polyester foam material color matching database, gives the ratio of the colored polyester foam materials through computer color matching according to the target fiber color, and selects a polyester reclaimed material intelligent distribution mixing system; the color matching database of the colored polyester foam materials is characterized in that the colored polyester foam materials are respectively melted and molded into sheets with certain thickness according to different colors, a color measuring instrument is used for measuring the color, the reflectivity R value of a polyester sheet is tested within the visible light range of 400-700 nm, a curve graph of the R value and the wavelength lambda is established, and all the used bubble materials are established with a curve graph of the R value and the wavelength lambda; according to the real-time color measurement result of the color measuring instrument, color master batches are added into the dynamic mixer, the chromatic aberration of the finished fiber is controlled to be 3-4 grade or above, and online color complementing and color mixing are realized so as to achieve the target fiber color.
Further, the present invention also discloses an intelligent control device, which comprises a processor, a memory and a computer program stored on the memory and capable of running on the processor, wherein when the computer program is executed by the processor, the following method is implemented:
1) According to the color of the target fiber, the proportion of the colored polyester foam is given through color matching, and a polyester reclaimed material intelligent distribution and mixing system is selected for dosing; the data of the color matching colored polyester foam material color matching database is subjected to color matching according to a Friele model;
the method for establishing the color matching database of the colored polyester foam material comprises the following steps: respectively melting and molding the colored polyester foam materials into sheets with certain thickness according to different colors, measuring the colors by using a color measuring instrument, testing the reflectivity R value of the polyester sheet in the visible light range of 400-700 nm, establishing a curve graph of the R value and the wavelength lambda, and establishing a curve graph of the R value and the wavelength lambda for all used bubble materials;
2) According to the real-time color measurement result of a color measuring instrument arranged in front of a spinning manifold, color master batches are added into a dynamic mixer, the color difference between finished fibers is controlled to be 3-4 grade or above, and online color complementing and color mixing are realized to achieve the target fiber color.
Further, the present invention also discloses a non-transitory computer readable carrier medium storing program instructions, the computer readable storage medium storing thereon a computer program which, when executed by the processor, implements the method of:
1) According to the color of the target fiber, the proportion of the colored polyester foam is given through color matching, and a polyester reclaimed material intelligent distribution and mixing system is selected for dosing; the data of the color matching colored polyester foam material color matching database is subjected to color matching according to a Friele model;
the method for establishing the color matching database of the colored polyester foam material comprises the following steps: respectively melting and molding the colored polyester foam materials into sheets with certain thickness according to different colors, measuring the color by using a color measuring instrument, testing the reflectivity R value of the polyester sheet in a visible light range of 400-700 nm, establishing a curve graph of the R value and the wavelength lambda, and establishing a curve graph of the R value and the wavelength lambda for all used bubble materials;
2) According to the real-time color measurement result of a color measuring instrument arranged in front of a spinning manifold, color master batches are added into a dynamic mixer, the color difference between finished fibers is controlled to be 3-4 grade or above, and online color complementing and color mixing are realized to achieve the target fiber color.
By adopting the technical scheme, the method establishes the color matching database of the colored polyester foam material, performs multi-element in-situ color matching on the polyester foam material, performs real-time online monitoring on the color of the melt, performs color master batch addition through a dynamic mixer to realize online color matching and color compensation, and realizes that the chromatic aberration between finished fibers is controlled to be 3-4 grade or above. The colored regenerated low-melting-point fiber prepared by the method has stable quality, can meet the diversified requirements of products, has low production cost, no pollution and strong market competitiveness, can be widely applied to the fields of automotive interiors, mattresses, indoor materials and the like, has an important promotion effect on the development of the textile industry to the green environmental protection direction, and has obvious economic and social benefits.
Drawings
FIG. 1 is a computer color matching calculation model of a polyester foam based on a Friele model.
FIG. 2 is a spinning process for developing colored regenerated low-melting-point fibers by utilizing the color of waste polyester textiles in situ.
Detailed Description
Example 1
A4D (4.44 dtex) 51mm brown regenerated low-melting fiber is prepared by the following method:
preparation of brown coloured polyester: classifying polyester foam materials according to colors and components, performing multi-element in-situ color matching on the polyester foam materials by using a full spectrum algorithm through a Friele model on the basis of a foam material color base database according to the color of a brown fiber textile to obtain a foam material color matching formula, performing mixed material mixing and feeding on the foam materials by using a polyester reclaimed material intelligent distribution mixing system and method according to the formula requirements, drying the mixed foam materials to ensure that the moisture content is less than 70ppm, and melting the dried foam materials by using a physical and chemical method, wherein an online light splitting test instrument is arranged in front of a spinning box body, and according to the color difference between a melt and a target fiber, the rotating speed of an adding pump of a dynamic mixer is controlled through frequency conversion to perform corresponding stepless adjustment, dynamically adding the amount of color master batches to realize online color matching and color compensation, the selected color master batches are red master batches, and the specific formula of color matching and color compensation is shown in Table 1:
TABLE 1 Brown low-melting point polyester staple fiber foaming material formula and color master batch material
| Item | Red soaking material | Brown foam | Black foam material | Red masterbatch |
| Formulation of | 25％ | 60％ | 15％ | 1.5 kg/ton |
Wherein the red foam materials have L, a and b values of 34.02, 21.21 and 7.29 respectively
The brown foam materials have L, a and b values of 28.55, 2.36 and 1.21 respectively
The black foam materials have L, a and b values of 23.88, 0.13 and-0.54 respectively
The L, a and b values of the red master batch are 28.02, 32.21 and 6.29 respectively.
Preparation of low-melting polyester, the feeding molar ratio of isophthalic acid to terephthalic acid is 1.8, EG. The esterification reaction is carried out under the pressurization of nitrogen, the pressure is 0.15MPa, and the reaction time is 2.2h; the polycondensation reaction temperature is 275 ℃, the vacuum degree is 90Pa, the reaction time is 3.5h, and the melt degree of the obtained low-melting-point polyester is 103 ℃.
3. The two polyester melts are metered by respective metering pumps and then enter a spinning composite component, and the melts sprayed from a spinneret plate of the composite component are cooled, oiled, bunched, drawn, curled, shaped, cut off and packaged to obtain the sheath-core brown regenerated low-melting-point fiber.
The obtained brown regenerated low-melting-point fiber has the following physical indexes, all technical indexes all meet the technical requirements of conventional products, and the color difference between fibers is 4-5 grades.
Linear density: 4.94dtex
Breaking strength: 3.16cN/dtex
Elongation at break: 48.3 percent
Dry Heat shrinkage (85 ℃ C.): 5.2 percent.
Example 2
A4D (4.44 dtex) 51mm green regenerated low-melting fiber is prepared by the following method:
preparation of green colored polyester: classifying polyester foam materials according to colors and components, classifying the polyester foam materials according to colors of brown fiber textiles, taking a foam material color basic database as a basis, performing multi-element in-situ color matching on the polyester foam materials by using a Friele model through a full spectrum algorithm to obtain a foam material color matching formula, performing mixed proportioning and feeding on the foam materials by using a polyester reclaimed material intelligent distribution mixing system and method according to formula requirements, drying the mixed foam materials to ensure that the moisture content is less than 70ppm, and melting the dried foam materials by using a physical and chemical method, wherein an online light splitting test instrument is arranged in front of a spinning box body, and according to the color difference between a melt and target fibers, a dynamic mixer is controlled by frequency conversion to add the rotating speed of a pump, so that corresponding stepless adjustment is performed, the amount of color master batches is dynamically added to realize online color matching and color compensation, the selected color master batches are red master batches, and the specific formula of color matching and color compensation is shown in Table 1:
TABLE 2 Green low-melting polyester staple fiber foaming material formula and color master batch material
| Item | Grass green soaking material | Fruit green soaking material | Blue foam | Green masterbatch |
| Formulation of | 45％ | 35％ | 20％ | 1 kg/ton |
Wherein the green foam materials have L, a and b values of 38.02, -4.54 and 5.39 respectively
The values of L, a and b of the green fruit soaking materials are 42.55, -2.54 and 2.21 respectively
The L, a and b values of the blue foam materials are respectively 33.88, 0.13 and-5.54
The L, a and b values of the green master batch are 29.12, -8.54 and 5.29 respectively.
Preparation of low-melting polyester, the feeding molar ratio of isophthalic acid to terephthalic acid is 1.85, EG. The esterification reaction is carried out under the pressurization of nitrogen, the pressure is 0.15MPa, and the reaction time is 2.5h; the polycondensation reaction temperature is 275 ℃, the vacuum degree is 100Pa, the reaction time is 3.2h, and the melt degree of the obtained low-melting-point polyester is 108 ℃.
3. The two polyester melts are metered by respective metering pumps and then enter a spinning composite assembly, and the melts sprayed from a spinneret plate of the composite assembly are cooled, oiled, bunched, drafted, curled, shaped, cut off and packaged to obtain the sheath-core type green regenerated low-melting-point fiber.
The obtained green regenerated low-melting-point fiber has the following physical indexes, all technical indexes all meet the technical requirements of conventional products, and the color difference between fibers is 3-4 grades.
Linear density: 5.23dtex
Breaking strength: 3.2cN/dtex
Elongation at break: 44.9 percent
Dry Heat shrinkage (85 ℃ C.): 5.4 percent.
Example 3
A4D (4.44 dtex) 51mm black regenerated low-melting-point fiber is prepared by the following method:
preparation of black colored polyester: classifying polyester foam materials according to colors and components, classifying the polyester foam materials according to colors of brown fiber textiles, taking a foam material color basic database as a basis, performing multi-element in-situ color matching on the polyester foam materials by using a Friele model through a full spectrum algorithm to obtain a foam material color matching formula, performing mixed proportioning and feeding on the foam materials by using a polyester reclaimed material intelligent distribution mixing system and method according to formula requirements, drying the mixed foam materials to ensure that the moisture content is less than 70ppm, and melting the dried foam materials by using a physical and chemical method, wherein an online light splitting test instrument is arranged in front of a spinning box body, and according to the color difference between a melt and target fibers, a dynamic mixer is controlled by frequency conversion to add the rotating speed of a pump, so that corresponding stepless adjustment is performed, the amount of color master batches is dynamically added to realize online color matching and color compensation, the selected color master batches are red master batches, and the specific formula of color matching and color compensation is shown in Table 1:
TABLE 3 Black low-melting polyester staple fiber foaming material formula and color masterbatch material
| Item | Black foam material | Baolan foam material | Black masterbatch |
| Formulation of | 50％ | 5％ | 5 kg/ton |
Wherein the L, a and b values of the black foam are respectively 24.61, 0.31 and-0.06
The value of the Baolan foam materials L, a and b are 36.78, 2.13 and-6.54 respectively
The L, a and b values of the black master batch are respectively 15.12, 0.13 and-0.81.
2. Preparation of low-melting polyester, the feeding molar ratio of isophthalic acid to terephthalic acid is 1.9, EG. The esterification reaction is carried out under the pressurization of nitrogen, the pressure is 0.15MPa, and the reaction time is 2.5h; the polycondensation reaction temperature is 275 ℃, the vacuum degree is 100Pa, the reaction time is 3.2h, and the melt degree of the obtained low-melting-point polyester is 110 ℃.
3. The two polyester melts are metered by respective metering pumps and then enter a spinning composite assembly, and the melts sprayed out of a spinneret plate of the composite assembly are cooled, oiled, bunched, drafted, curled, shaped, cut off and packaged to obtain the sheath-core black regenerated low-melting-point fiber.
The obtained black regenerated low-melting-point fiber has the following physical indexes, all technical indexes all meet the technical requirements of conventional products, and the color difference between fibers is in 4 grades.
Linear density: 4.95dtex
Breaking strength: 3.23cN/dtex
Elongation at break: 42 percent of
Dry Heat shrinkage (85 ℃ C.): 6.3 percent.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention, including any reference to the above-mentioned embodiments. Various modifications to these embodiments will be readily apparent to those skilled in the art. The general principles defined herein may be implemented in 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 (6)
1. A method for producing colored regenerated low-melting-point fibers by utilizing colors of waste polyester textiles in situ is characterized in that the method takes the waste polyester textiles as raw materials to prepare a composite fiber core layer by adopting a physical and chemical method and comprises the following steps:
1) Firstly, preparing waste polyester textiles into polyester bubble materials, establishing a color matching database of colored polyester bubble materials, giving the proportion of the colored polyester bubble materials through computer color matching according to the color of target fibers, and selecting an intelligent polyester reclaimed material distribution and mixing system for proportioning and putting;
the method for establishing the color matching database of the colored polyester foam comprises the following steps: respectively melting and molding the colored polyester foam materials into sheets with certain thickness according to different colors, measuring the color by using a color measuring instrument, testing the reflectivity R value of the polyester sheet in a visible light range of 400-700 nm, establishing a curve graph of the R value and the wavelength lambda, and establishing a curve graph of the R value and the wavelength lambda for all used bubble materials;
the color matching model is a Friele model, and the variable parameters of a Friele model formula are set to be 0.146217-0.157890; the computer color matching algorithm adopts a full spectrum 400-700 nm matching algorithm; the computer color matching and color difference evaluation adopts a CIEDE2000 color difference formula;
2) Installing a color measuring instrument in front of the spinning manifold, adding color master batches in a dynamic mixer according to a real-time color measuring result, controlling the color difference between finished fibers to be 3-4 grade or above, and realizing online color compensation and color mixing to achieve the target fiber color;
the color measuring instrument is an online light splitting test instrument, the light source is a pulse xenon lamp, the wavelength range is 340-740 nm, the color measuring instrument is arranged in front of the spinning manifold to monitor the color of the melt in real time, and the color difference analysis is carried out on the color measuring result and the color of the target fiber;
the dynamic mixer is provided with a main pipeline booster gear pump and a color master batch adding gear pump, wherein the color master batch adding gear pump is provided with a frequency converter and can perform stepless speed change according to the supply requirement, and the dynamic mixer can sufficiently mix the polyester melt and the color master batch melt in a short time to realize online color mixing and color compensation.
2. The method of claim 1, wherein: the color master batches all use PET as a carrier, and disperse dye is used as a coloring agent.
3. The method of claim 1, wherein: the cortex takes isophthalic acid and diglycol as modification monomers, and the esterification copolycondensation method is adopted to carry out low-melting-point copolymerization modification on the primary PET polyester; PTA = 1.8 to 1.9, EG; the melting range of the polyester on the surface layer is 90-180 ℃.
4. The equipment for producing the colored regenerated low-melting-point fiber by utilizing the color of the waste polyester textile in situ comprises a skin layer melt native PET polyester modification synthesis device, a core layer regenerated colored polyester physical and chemical method production device and a double temperature control composite spinning box body, and is characterized in that the core layer regenerated colored polyester physical and chemical method production device comprises a computer color matching system, a polyester regenerated material intelligent distribution and mixing system and a dynamic mixer, wherein the computer color matching system is connected to the polyester regenerated material intelligent distribution and mixing system to control the distribution and the feeding of the polyester regenerated material, the dynamic mixer is connected with a color master melt distribution screw rod, and the dynamic mixer is connected to the double temperature control composite spinning box body; the double-temperature-control composite spinning manifold is provided with a color measuring instrument, the color measuring instrument collects data and is connected to a computer color matching system, and the computer color matching system is connected with and controls the batching and feeding of a color master melt batching screw rod;
the method adopted by the equipment comprises the following steps:
1) Firstly, preparing waste polyester textiles into polyester bubble materials, establishing a color matching database of colored polyester bubble materials, giving the proportion of the colored polyester bubble materials through computer color matching according to the color of target fibers, and selecting an intelligent polyester reclaimed material distribution and mixing system for proportioning and putting;
the method for establishing the color matching database of the colored polyester foam comprises the following steps: respectively melting and molding the colored polyester foam materials into sheets with certain thickness according to different colors, measuring the color by using a color measuring instrument, testing the reflectivity R value of the polyester sheet in a visible light range of 400-700 nm, establishing a curve graph of the R value and the wavelength lambda, and establishing a curve graph of the R value and the wavelength lambda for all used bubble materials;
the color matching model is a Friele model, and the variable parameters of a Friele model formula are set to be 0.146217-0.157890; the computer color matching algorithm adopts a full spectrum matching algorithm of 400-700 nm; the computer color matching and color difference evaluation adopts a CIEDE2000 color difference formula;
2) Installing a color measuring instrument in front of the spinning manifold, adding color master batches in a dynamic mixer according to a real-time color measuring result, controlling the color difference between finished fibers to be 3-4 grade or above, and realizing online color compensation and color mixing to achieve the target fiber color;
the color measuring instrument is an online light splitting test instrument, the light source is a pulse xenon lamp, the wavelength range is 340-740 nm, the color measuring instrument is arranged in front of the spinning manifold to monitor the color of the melt in real time, and the color difference analysis is carried out on the color measuring result and the color of the target fiber;
the dynamic mixer is provided with a main pipeline booster gear pump and a color master batch adding gear pump, wherein the color master batch adding gear pump is provided with a frequency converter and can perform stepless speed change according to the supply requirement, and the dynamic mixer can sufficiently mix the polyester melt and the color master batch melt in a short time to realize online color mixing and color compensation.
5. An intelligent control device comprising a processor, a memory, and a computer program stored on the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the method of claim 1.
6. A non-transitory computer-readable carrier medium storing program instructions, wherein the computer-readable storage medium stores thereon a computer program that, when executed by a processor, implements the method of claim 1.
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