CN114622293A - Production process for spinning fine denier yarn on iBox 32-head equipment - Google Patents
Production process for spinning fine denier yarn on iBox 32-head equipment Download PDFInfo
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- CN114622293A CN114622293A CN202111485279.3A CN202111485279A CN114622293A CN 114622293 A CN114622293 A CN 114622293A CN 202111485279 A CN202111485279 A CN 202111485279A CN 114622293 A CN114622293 A CN 114622293A
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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
- D01D5/08—Melt spinning methods
- D01D5/096—Humidity control, or oiling, of filaments, threads or the like, leaving the spinnerettes
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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
- D01D11/00—Other features of manufacture
- D01D11/04—Fixed guides
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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
- D01D13/00—Complete machines for producing artificial threads
- D01D13/02—Elements of machines in combination
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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
- D01D5/08—Melt spinning methods
- D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes
- D01D5/092—Cooling filaments, threads or the like, leaving the spinnerettes in shafts or chimneys
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/507—Polyesters
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/30—Synthetic polymers consisting of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/32—Polyesters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
- Artificial Filaments (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
Abstract
The invention relates to the field of spinning, and provides a production process for spinning fine denier yarns on iBox 32-head equipment, aiming at the problem that fine denier yarns of polyester produced by iBox equipment are easy to generate broken yarns, which comprises the following steps: and spinning, cooling, oiling and drafting the polyester melt in sequence to obtain fine denier yarns, wherein the oiling is emulsion oiling. According to the invention, the oiling mode of the iBox equipment is changed from crude oil oiling to emulsion oiling, so that the oiling uniformity is improved, and fiber broken filaments are reduced.
Description
Technical Field
The invention relates to the field of spinning, in particular to a production process for spinning fine denier yarns on iBox 32-head equipment.
Background
The polyester fine denier yarn has the characteristics of softness and smoothness, and the prepared fabric has good moisture absorption and dispersion and higher market value. Currently, fine denier yarns are produced mainly by melt direct spinning, for example, patent No. CN201811223360.2 entitled "a process for producing high-strength polyester fine denier profiled yarns" discloses a process for producing ultra-fine denier yarns, which is formed by melt spinning, cooling, oiling, pre-networking, stretch forming, main networking and winding. The method can effectively produce the ultra-fine denier yarn, but the oiling is easily uneven due to the adoption of a double-oil-nozzle oiling mode. On the latest iBOX equipment of TMT company, the production of fine denier yarn has difficulties: the production is unstable, the full-package rate is low, and broken ends, broken filaments and the like are easily generated in the spinning process due to small fineness. Therefore, the method has great practical significance in researching the production process of the polyester fine denier yarn on the iBox equipment, improving the spinnability and the production quality of the polyester fine denier yarn.
Disclosure of Invention
The invention provides a production process for spinning fine denier yarns on iBox 32-head equipment, aiming at solving the problem that broken yarns are easy to generate in the production of polyester fine denier yarns by iBox equipment.
In order to achieve the purpose, the invention adopts the following technical scheme:
a production process for spinning fine denier yarns on iBox 32-head equipment comprises the following steps: and spinning, cooling, oiling and drafting the polyester melt in sequence to obtain fine denier yarns, wherein oiling is carried out on emulsion. The design concept of the iBOX equipment is that the energy consumption is reduced by oiling crude oil, so that the production cost is reduced, but the oiling amount is small when the crude oil is oiled, and the oiling uniformity is relatively poor. The invention changes the method into emulsion oiling, improves the oiling uniformity and reduces the fiber broken filament. In addition, the position of the oil frame and the angle between the yarn guide hook and the oil nozzle can be adjusted simultaneously, so that the tows are better attached to the oil nozzle, and the tension of the tows is uniform.
Preferably, the spinning temperature is 280-300 ℃, and the speed is 4400-4800 m/min.
Preferably, the length of the polyester filament yarn from the spinning equipment to the beginning of cooling is called as the length of the calm zone, and the calm zone is shortened to 50-55 mm. The length of the calm zone influences the degree of pre-crystallization of the polyester filament yarn, and has important influence on the quality and the production condition of the filament yarn. The original windless area of the iBox equipment is 63mm in length, the windless area is shortened to 50-55mm by adding the component connecting plate, the full-roll rate is improved from 92% to 97% by verification, and the production is more stable.
Preferably, the cooling is performed by circular blowing, and the wind speed is 1.4-2.6 m/s. And a circular blowing process is adopted, so that the tows are uniformly cooled.
Preferably, the bundle height is 200 mm. The bundling height is the height of the oiling oil frame.
Preferably, the emulsion comprises water, crude oil, hydroxyl-terminated hyperbranched polyester and an emulsifier, and the preparation method of the hydroxyl-terminated hyperbranched polyester comprises the following steps: adding toluenesulfonic acid into trimethylolpropane and 2, 2-dimethylolbutyric acid with the molar ratio of 1 (7-8) to (0.1-0.2), reacting for 1-2h at 160 ℃ under the protection of nitrogen, vacuumizing, and continuing to react until the acid value of the reaction liquid is unchanged, thus obtaining the hydroxyl-terminated hyperbranched polyester.
The terylene fiber has symmetrical and linear molecular structure, lacks polar groups, has large intermolecular force, higher crystallinity, smooth and compact surface, is not easy to infiltrate into crude oil, and has poor cohesiveness with the crude oil. In order to further improve the oiling uniformity, hydroxyl hyperbranched polyester is added into the oiling emulsion. During oiling, the emulsion is sprayed to the surface of the polyester filament yarn, and the hydroxyl-terminated hyperbranched polyester is easier to adsorb and wind on the surface of the polyester filament yarn by virtue of a large number of branch structures. By means of a large number of branch structures, on one hand, a layer of network-shaped film is attached to the surface of the polyester filament yarn, so that the originally smooth surface of the polyester filament yarn becomes uneven, and the adsorption quantity of crude oil is increased; on the other hand, a large number of hydroxyl groups in the branch structure are easy to penetrate into the fibers of the polyester filaments because of polarity and small volume, so that a penetration space is provided for the crude oil, and the penetration amount and oiling uniformity of the crude oil can be obviously improved.
Preferably, the hydroxyl-terminated hyperbranched polyester is grafted with catechin, and the specific steps are as follows: (1) dissolving malic acid and catechin in ethanol solution, adding thionyl chloride at a molar ratio of (1-1.2) to (1-2.2) to (1) under ice bath, and reacting at 40-50 deg.C for 2-3h to obtain catechin with carboxyl; (2) reflux-reacting carboxyl catechin and hydroxyl-terminated hyperbranched polyester at a molar ratio of (1.2-1.5) to 1 in THF for 10-12h, wherein the catalyst is concentrated sulfuric acid with a mass of 1-2% of catechin.
The corruption of an oil emulsion is one of the most common problems of an oil agent in the using process, the corruption has great influence on textile production, and can block a pipeline, cause uneven oiling, cause phenomena such as broken filaments and broken ends. The addition of the preservative has good compatibility with the emulsion and is safe and environment-friendly. Catechin is the main functional component in tea, accounts for 12% -24% of dry weight of tea, and multiple phenolic hydroxyl groups in molecular structure endow it with good antioxidant, antibacterial and deodorant effects, is natural antiseptic, and is harmless to human health. But the catechin is directly added into the emulsion and has poor dispersibility, therefore, the invention grafts the catechin on the hydroxyl-terminated hyperbranched polyester in advance, thereby solving the compatibility problem, not separating out the catechin, but also solving the dispersion problem, and evenly grafts the catechin on the hydroxyl-terminated hyperbranched polyester by controlling the reaction conditions. The reaction steps of the invention are that catechin and malic acid are firstly esterified to make catechin have carboxyl end group, and then carboxyl is modified to react with hydroxyl of hydroxyl-terminated hyperbranched polyester. After the reaction, partial hydroxyl on the hydroxyl-terminated hyperbranched polyester is replaced by catechin groups, and the phenolic hydroxyl group of catechin has lower polarity than that of alcoholic hydroxyl group, so that the polarity of the hydroxyl-terminated hyperbranched polyester can be reduced, and the compatibility of the hydroxyl-terminated hyperbranched polyester in the emulsion can be improved. The ratio of hydroxyl to catechin in the hydroxyl-terminated hyperbranched polyester is an important parameter, and if the catechin is too little, the preservative effect is limited; if the amount of catechins is too large, the adsorption rate of crude oil is lowered. According to the invention, the mole ratio of the carboxyl catechin-containing hyperbranched polyester to the hydroxyl-terminated hyperbranched polyester is preferably (1.2-1.5): 1.
Preferably, the draft is: the oiled silk sequentially passes through a GR0 godet roller, an HR1 hot roller, an HR2 hot roller, an HR3 hot roller, an HR4 sizing roller, an HR5 sizing roller, a GR1 godet roller and a GR2 godet roller and then enters a main network device, and the silk bundle passing through the main network device passes through the GR3 godet roller and is finally wound and molded. More preferably, the speed of GR0 is 9-11m/min lower than HR 1.
The iBOX equipment is a five-roller draft, wherein HR1, HR2, HR3 are draft rollers, HR4, HR5 are sizing rollers. A yarn guide roller GR0 is arranged in front of the heat inlet box to change the direction of the yarn strips and feed the yarns, the speed of GR0 is set to be 10m/min lower than that of HR1, the yarn strips keep certain tension and cohesion before drafting, the function of pre-networking the yarn strips before drafting in the traditional FDY process is achieved, and a pre-networking device is omitted. After being drafted and shaped, the filament yarns pass through GR1, GR2, a net device and GR3 and then enter two 16-head winding machines for winding and forming. GR3 is lifted above the winding head through a guide rail, so that the yarns can be distributed symmetrically and enter two parallel winding machines.
Further preferably, the network pressure of the main network device is 0.28-0.35 MPa. Because the fineness of the fine denier yarn is small, a good network effect can be achieved by adopting small network pressure, the network pressure of the fine denier yarn cannot be set too high, and otherwise, the yarn bundle is easily blown off by air flow sprayed by a network nozzle.
Therefore, the beneficial effects of the invention are as follows: (1) the oiling mode of iBox equipment is changed from crude oil oiling to emulsion oiling, so that the oiling uniformity is improved, and fiber broken filaments are reduced; (2) the assembly connecting plate is added to shorten a windless area, the full-winding rate is improved from 92% to 97%, and the spinnability of spinning is improved; (3) the circular blowing process is adopted to uniformly cool the tows and improve the uniformity of the tows.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples.
In the present invention, unless otherwise specified, all the raw materials and equipment used are commercially available or commonly used in the art, and the methods in the examples are conventional in the art unless otherwise specified.
Example 1
A production process of 22dtex/24f polyester fine denier yarn comprises the following steps: polyester melt is formed by a polyester final polycondensation kettle → a discharge pump → a filter → a melt distribution valve → a booster pump → a melt heat exchanger → a melt distribution valve → a spinning box → circular air-cooling forming → oil nozzle oiling → GR0 godet → HR1 hot roller → HR2 hot roller → HR3 hot roller → HR4 sizing roller → HR5 sizing roller → GR1 godet → GR2 godet → main network → GR3 godet → winding head, and more specific parameters and steps are as follows:
the spinning temperature was set to 291 ℃ and the spinning speed was set to 4700 m/min.
The 22dtex/24f titer is small, a spinneret plate with the 0.19 aperture specification is selected, the monofilament of the fine denier yarn is fine, the aperture is small, a filter screen which is finer than the conventional yarn and finer sand are required to be selected, and a spot welding net is added at the same time, so that the melt can be more uniform by the component proportion, and the fluidity and spinnability of the melt are improved.
The length from the point that the polyester filament is discharged from the spinneret plate to the point that the polyester filament is contacted with cooling air and begins to be cooled is called the length of a calm zone, and the length of the calm zone influences the degree of pre-crystallization of the polyester filament and has important influence on the quality and the production condition of the filament. The length of the windless area of the iBox equipment is 63mm, and the windless area is shortened to 53mm by adding the component connecting plate.
In the experiment, a TMT outer ring blowing process is adopted, and the wind speed is set to be 1.5 m/s.
The height of the cluster, namely the height of the oil rack, is selected to be 200 mm.
The design concept of the iBOX equipment is that crude oil is oiled, so that the energy consumption is lower, and the production cost is reduced. But the oiling amount is small when the crude oil is oiled, and the oiling uniformity is relatively poor. The 22dtex/24f production is changed into emulsion oiling, and the emulsion is DELION TMT 217L-45% emulsion, so that the oiling uniformity is improved; meanwhile, the positions of the oil racks and the angles of the yarn guide hooks and the oil nozzles are adjusted, so that the tows are better attached to the oil nozzles, and the tension of the tows is uniform.
The iBOX equipment is a five-roller drafting system, wherein HR1, HR2 and HR3 are drafting rollers, and HR4 and HR5 are shaping rollers. A guide roller GR0 is arranged in front of the heat box to change the direction of the silk thread and feed. The GR0 speed is set to be 10m/min lower than HR1, the filament yarns keep certain tension and cohesion before drafting, the pre-networking effect of the traditional FDY process before drafting is achieved, and a pre-networking device is omitted. Because the monofilament is thinner, a smaller drawing ratio of 1.54 is needed, and the condition that the monofilament is excessively drawn and broken to generate broken filaments is avoided.
Besides the drafting and shaping roller and the GR0 yarn guide roller, the iBOX device also comprises 3 yarn guide rollers of GR1, GR2 and GR 3. After being drafted and shaped, the filament yarns pass through GR1, a net device, GR2 and GR3 and then enter two 16-head winding machines for winding and forming. GR3 is lifted above the winding head through a guide rail, so that the yarns can be distributed symmetrically and enter two parallel winding machines. The fine denier yarn has small fineness, thin single yarn and small running tension, and the yarn runs unstably on each roller. The control of the tension between the rollers is very important for the production of fine denier yarns, and when the tension is too low, the yarns are shaken seriously and are easy to break, and when the tension is too high, the yarns are easy to clamp. The tow tension can be increased appropriately, in this example the tension from GR3 to the winder is adjusted to 5.0 cN.
Because the fineness of the fine denier yarn is small, a good network effect can be achieved by adopting small network pressure, the network pressure of the fine denier yarn cannot be set too high, otherwise, the yarn bundle is easily blown off by airflow sprayed by a network nozzle, the fineness is only 20D in the embodiment, and the network pressure is set to be 0.28 MPa.
Example 2
The difference from example 1 is that the draw ratio is increased by a factor of 1.0 at HR2 and HR3 by setting up a two-step draw. Between HR3 and HR 4.
The success rate of the production is improved, but the whole silk path condition is deteriorated. The increased tension causes pipe blocking, and the reduced tension causes the tows to wind around the rollers at HR3 and GR1 and GR2, so that the production stability of broken ends is poor.
Example 3
The production process of the 40dtex/48f fine polyester filament is the same as that of the embodiment 1 in the whole steps, and is different from the embodiment 1 in the following specific parameters:
the spinning temperature was set to 291 ℃ and the spinning speed was set to 4400 m/min.
A 0.16 pore size spinneret was selected.
The length of the calm zone is shortened to 50 mm.
The wind speed was set at 2.0 m/s.
The network pressure was set at 0.35 MPa.
Example 4
The differences from example 1 are: the emulsion is self-made emulsion and consists of water, crude oil, hydroxyl-terminated hyperbranched polyester and an emulsifier. The preparation method of the hydroxyl-terminated hyperbranched polyester comprises the following steps: adding toluenesulfonic acid into trimethylolpropane and 2, 2-dimethylolbutyric acid with the molar ratio of 1:7:0.1, reacting for 2h at 140 ℃ under the protection of nitrogen, vacuumizing, and continuing to react until the acid value of the reaction solution is not changed, thus obtaining the hydroxyl-terminated hyperbranched polyester.
Example 5
The differences from example 4 are: catechin is also grafted on the hydroxyl-terminated hyperbranched polyester, and the steps are as follows: dissolving malic acid and catechin in an ethanol solution, adding thionyl chloride in an ice bath, wherein the molar ratio of the malic acid to the catechin to the thionyl chloride is 1:1:2, and reacting at 40 ℃ for 3 hours to obtain catechin with carboxyl; the carboxyl catechin-containing and hydroxyl-terminated hyperbranched polyester with the molar ratio of 1.2:1 is subjected to reflux reaction in THF for 10 hours, and the catalyst is concentrated sulfuric acid with the mass of 1% of catechin.
Example 6
The difference from the example 5 is that (1) the preparation method of the hydroxyl-terminated hyperbranched polyester comprises the following steps: adding toluenesulfonic acid into trimethylolpropane and 2, 2-dimethylolbutyric acid with the molar ratio of 1:8:0.2, reacting for 1h at 160 ℃ under the protection of nitrogen, vacuumizing, and continuing to react until the acid value of the reaction solution is not changed, thus obtaining the hydroxyl-terminated hyperbranched polyester.
(2) The hydroxyl-terminated hyperbranched polyester grafted catechin comprises the following steps: dissolving malic acid and catechin in ethanol solution, adding thionyl chloride in ice bath, wherein the molar ratio of malic acid to catechin to thionyl is 1.2:1:2.2, and reacting at 50 ℃ for 3h to obtain catechin with carboxyl; the carboxyl catechin-containing and hydroxyl-terminated hyperbranched polyester with the molar ratio of 1.5:1 is subjected to reflux reaction in THF for 12 hours, and the catalyst is concentrated sulfuric acid with the mass of catechin being 2%.
Example 7
The difference from example 5 is that the molar ratio of the carboxyl catechin and the hydroxyl-terminated hyperbranched polyester is 1.8: 1.
Comparative example 1
The difference from example 1 is that oiling with crude oil is used.
Comparative example 2
The difference from example 1 is that the length of the calm zone is 63 mm.
Comparative example 3
The difference from example 1 is that the tension from GR3 to the winder is 4.1 cN.
As a result, the production state is deteriorated and the success rate of the spinning-in is lowered. The tow sways greatly during the secondary climbing, and the tow is connected with GR3 to cause end breakage.
Test results
First, the fine denier filaments obtained in each of the examples and comparative examples were subjected to performance tests, and the results are shown in the following table.
As can be seen from the table, the physical indexes of the product prepared by the embodiment 1 of the invention can meet the requirements of the processing of the subsequent working procedure, the appearance has no broken filament, and the forming is good. Compared with example 1: compared with the prior art, the method has the advantages that crude oil is used for oiling, the yarn evenness u value is large, oiling is not uniform, and oiling uniformity is obviously improved after the method is changed into emulsion oiling; secondly, in the embodiment 4, hydroxyl hyperbranched polyester is added into the emulsion, so that the oiling uniformity is further improved; embodiment 4 adopts the grafted catechin-containing hydroxyl-terminated hyperbranched polyester emulsion for oiling, although catechin mainly has the function of corrosion prevention and is effective for improving the oiling uniformity, the speculation is that the catechin reduces the polarity of the hydroxyl-terminated hyperbranched polyester and improves the compatibility of the hydroxyl-terminated hyperbranched polyester in the emulsion, thereby improving the dispersion uniformity and also having the function of the oiling uniformity; fourthly, the amount of catechin used is not too large, and the amount of catechin used exceeds the preferable range in example 7, and the evenness of the yarn is rather reduced because the catechin replaces hydroxyl too much, which lowers the adsorption rate of the crude oil.
In addition, other parameters also have an impact on the invention: compared with the embodiment 1, the length of the windless area in the comparative example 2 is 63mm, the full-winding effect is inferior, the windless area is shortened by adding the component connecting plate, the full-winding rate is improved from 92% to 97%, and the spinnability of spinning is improved; ② the tension of comparative example 3 is out of the preferable range, leading to a low full-lap ratio; and thirdly, the embodiment 2 is adjusted into two-step stretching, the success rate of the end-stitching is improved, but the condition of the whole silk path is poor.
Secondly, the effect of the catechin is embodied in that the shelf life of the emulsion is prolonged. In the same workshop, the preservative-free component in example 4 has a shelf life of only 2 months, and no delamination or mold generation occurs in 13 months after catechin grafting in example 5, so that the effect is good.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A production process for spinning fine denier yarns on iBox 32-head equipment is characterized by comprising the following steps: and spinning, cooling, oiling and drafting the polyester melt in sequence to obtain fine denier yarns, wherein the oiling is emulsion oiling.
2. The production process for spinning fine-denier yarns on iBox32 head equipment as claimed in claim 1, wherein the spinning temperature is 280-300 ℃ and the spinning speed is 4400-4800 m/min.
3. The production process for spinning fine denier yarn on iBox32 head equipment as claimed in claim 1, wherein the length of the polyester filament from the spinning equipment to the beginning of cooling is called the length of the calm zone, and the length of the calm zone is shortened to 50-55 mm.
4. The production process of spinning fine denier yarn on iBox32 head equipment according to claim 1 or 3, wherein the cooling is by circular blowing, and the wind speed is 1.4-2.6 m/s.
5. The production process of the fine denier yarn spun on the iBox32 head equipment according to claim 1, wherein the emulsion comprises water, crude oil, hydroxyl-terminated hyperbranched polyester and an emulsifier, and the preparation method of the hydroxyl-terminated hyperbranched polyester comprises the following steps: adding toluenesulfonic acid into trimethylolpropane and 2, 2-dimethylolbutyric acid with the molar ratio of 1 (7-8) to (0.1-0.2), reacting for 1-2h at 160 ℃ under the protection of nitrogen, vacuumizing, and continuing to react until the acid value of the reaction liquid is unchanged, thus obtaining the hydroxyl-terminated hyperbranched polyester.
6. The production process of spinning fine denier yarn on iBox32 head equipment according to claim 5, wherein the hydroxyl-terminated hyperbranched polyester is grafted with catechin, and the specific steps are as follows: (1) dissolving malic acid and catechin in ethanol solution, adding thionyl chloride under ice bath, wherein the molar ratio of malic acid to catechin to thionyl chloride is (1-1.2):1 (2-2.2), and reacting at 40-50 deg.C for 2-3h to obtain catechin with carboxyl; (2) reflux-reacting carboxyl catechin and hydroxyl-terminated hyperbranched polyester at a molar ratio of (1.2-1.5) to 1 in THF for 10-12h, wherein the catalyst is concentrated sulfuric acid with a mass of 1-2% of catechin.
7. The production process for spinning fine denier yarn on iBox32 head equipment as claimed in claim 1, wherein the drafting is: the oiled silk sequentially passes through a GR0 godet roller, an HR1 hot roller, an HR2 hot roller, an HR3 hot roller, an HR4 sizing roller, an HR5 sizing roller, a GR1 godet roller and a GR2 godet roller and then enters a main network device, and the silk bundle passing through the main network device passes through the GR3 godet roller and is finally wound and molded.
8. The production process of fine denier yarn spun on an iBox32 head machine according to claim 7, wherein the GR0 speed is 9-11m/min slower than HR 1.
9. The production process for spinning fine filaments on an iBox32 head device according to claim 7 or 8, wherein the network pressure of the main network device is 0.28-0.35 MPa.
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