CN102677239B - Environment-friendly heather grey effect composite deformation filament yarn production process - Google Patents
Environment-friendly heather grey effect composite deformation filament yarn production process Download PDFInfo
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Abstract
The invention discloses an environment-friendly heather grey effect composite deformation filament yarn production process. The production process comprises the following steps of: (1) manufacturing POY (polyester pre-oriented yarn) silk A, (2) manufacturing POY silk B, and (3) controlling, snapping back and compounding. The technical scheme is adopted, the color spinning technology and the post-processing transformation technology are adopted for developing filament yarn type copy heather grey effect composite deformation silk, the production flow is simple, and the debugging control of equipment process is more convenient and accurate.
Description
Technical field
The present invention relates to chemical fiber field, particularly relate to the grey effect composite deformation long filament production technology of a kind of environment-friendly type fiber crops.
Background technology
The grey yarn of fiber crops is a kind of yarn spinned by true qualities and two or more short fiber blending coloured, i.e. staple blended yarn.The usage ratio in the yarn of general colored fibre is less (determines according to kind, generally only account for 5% ~ 40% of total amount), true qualities are in the great majority, colored fibre relatively all be dispersed in true qualities, focusing makes colored fibre obvious completely in the yarn be spun into, thus largely improving pure color Yarn color change shortcoming abundant not, These characteristics can be referred to as the fiber crops ash effect in numb grey yarn.
The production procedure of the grey yarn of fiber crops spinning line that is basic and other yarns is similar, and just in spinning, two kinds of raw materials are all undertaken by respective spinning line.When two kinds of raw materials are all processed into uniform thick bar fiber, two kinds of thick bar fibers are closed drawing-off and become slice, through drafting drawing-off repeatedly, the fiber of two kinds of compositions can be made to spread out more equably.Coloured cut staple wherein, its traditional production method is that polyester raw material is first through spinning poststaining.And dyeing is comparatively complicated, seriously polluted, cost, product aberration is large, COLOR FASTNESS is poor, fugitive color.
The consumption of the grey yarn of current fiber crops is constantly increasing, and particularly in knit fabric, is widely used in T Shirts, overcoat, cotton wool clothing.Its fabric style is brief, pure and fresh generous, and need not go dyeing after making textiles again, avoids the discharge of dyeing waste water.With the thread fabric of the grey yarn of fiber crops there is multicolour, feel is soft, surface is plentiful, added value advantages of higher, being applicable to knitting, sweater, the multiple fields such as woven, is the first-selected yarn of medium-to-high grade fabric.The knitted fabric that the numb grey yarn of current use is made is all the fashion at home and abroad, the garment beauty such as ZARA, H & M, Mei Tesibangwei use numb grey yarn all in a large number, downstream consumption colony grows gradually, and therefore rise year by year to the demand of the grey yarn of fiber crops, industry development has a extensive future.
But, the production and consumption of the grey yarn of fiber crops also exists difficult point and some restrictions.The first, staple fibre yarn spinning line is long, equipment is more, needs the process point of regulation and control more, can produce and cause more weak ring, and then improve production cost to finished product.Such as in shredding, combing stage, two kinds of raw materials will ensure to clean, and prevent being mixed into of other fiber residue and flyings, the whole process entails of production strictly controls workshop hygiene environment, could more effectively avoid numb grey yarn to produce yarn defect like particle node like this; The second, the grey yarn of existing fiber crops is produced very high to the requirement of drawing process, when drawing process is not in good time, there will be tufted yarn, joint joint yarn; 3rd, the grey yarn of existing fiber crops is produced fiber calculation requirement of distributing cotton also very high, distributes cotton to calculate and improperly will cause large quantities of product degradations, or even face the claim of client as fruit fiber; 4th, thinner fiber crops ash yarn shows the shortcoming of insufficient strength when applying, fabric easily occurs broken hole; 5th, the chemical short fiber in numb grey yarn easily spins off from yarn, forms little ball top and hangs over fabric face, affect the aesthetic property of fabric.
In view of this, the present inventor combines the many years of experience being engaged in fiber spinning research work, and study for a long period of time to the defect of above-mentioned technical field, this case produces thus.
Summary of the invention
The object of this invention is to provide the grey effect composite deformation long filament production technology of a kind of environment-friendly type fiber crops, the technology spun by look and aft-loaded airfoil deformation technology are developed long filament type and are imitated numb grey effect composite textured yam, and production procedure is simple, apparatus and process debugging control is comparatively accurately convenient.
For achieving the above object, technical scheme of the present invention is as follows:
The grey effect composite deformation long filament production technology of a kind of environment-friendly type fiber crops, comprises the following steps:
(1) POY silk A makes: spin on POY production line in routine section, full-dull or half delustring or large bright PET chips A is adopted to enter screw extruder through pre-crystallized, drying, section is extruded from head in screw extruder after melting, extruding, mixing, homogenizing, casing is entered again through filter, melt pipe, and sprayed from spinnerets by filament spinning component by after spinning pump accurate-metering, after cross air blowing device cooling curing, the winding shaping through oiling, after pre-the nozzle of interlace, obtained POY silk A;
(2) coloured POY silk B makes: spin on POY production line in routine section, adopt full-dull or half delustring or large bright PET chips B through pre-crystallized, after drying, mix by a certain percentage with the Masterbatch of drying and jointly enter screw extruder, through melting in screw extruder, extruding, mixing, extrude from head after homogenizing, again through filter, melt pipe enters casing, and sprayed from spinnerets by filament spinning component by after spinning pump accurate-metering, after cross air blowing device cooling curing, through oiling, winding shaping after pre-the nozzle of interlace, obtained coloured POY silk B,
(3) control, add bullet, compound obtains: POY silk A and POY silk B, on two feeding elasticizer, after Programmable controller controls to carry out adding bullet and high-accuracy network compound after feeding roller speed, obtains the composite deformation long filament of the grey effect of environment-friendly type fiber crops.
In step (1), drying condition: dry air dew point less than-80 DEG C, pre-crystallization temperature 150 ~ 170 DEG C, baking temperature 140-170 DEG C, drying time, 6-8 hour, made polyester slice moisture content≤0.003%; The each district temperature 280-293 DEG C of screw rod, spin manifold temperature 288-295 DEG C, the temperature of lateral blowing at 20-25 DEG C, wind speed 0.4-0.7m/s; Oil content: 0.35-0.45%, pre-network pressure 0.1-0.2MPa, spinning speed 2800-3300m/min.
In step (2), drying condition: dry air dew point less than-80 DEG C, pre-crystallization temperature 150 ~ 170 DEG C, baking temperature 135-170 DEG C, drying time, 6-8 hour, made polyester slice moisture content≤0.003%; The each district temperature 270-293 DEG C of screw rod, spin manifold temperature 270-285 DEG C, the temperature of lateral blowing at 20-25 DEG C, wind speed 0.35-0.55m/s; Oil content: 0.45-0.55%, pre-network pressure 0.1-0.2MPa, spinning speed 2700-3200m/min;
In step (1) and step (2), the hole count of measuring pump rotating speed, spinnerets and spinning speed will mate mutually, the POY silk A that obtains and POY silk B is made to have identical tensile property, namely there is identical percentage elongation, and its fine density ratio controls at A:B=1 ~ 3:1, the fine density of A in the fine density of 40 ~ 356dtex/12 ~ 192f, B at 28 ~ 178dtex/12 ~ 144f.
Further, the Masterbatch of drying described in step (2), has the solid content of more than 30% and is greater than the COLOR FASTNESS of 5 grades, drying condition is: dry air dew point less than-70 DEG C, baking temperature: 125-145 DEG C, drying time: 6-8 hour, makes dry color master batch moisture control below 0.005%.
Further, in step (3), POY silk A is by zero roller feeding, POY silk B is by a roller feeding, both merge and jointly carry out heating, cools, false twisting, enter the second hot case sizing, network again after stretching before the first hot case, and last coiling and molding obtains the composite deformation long filament of the numb grey effect of environment-friendly type;
Further, in step (3), texturing craft condition is: silk speed V=180-350m/min, first heater temperature H1=170-200 DEG C, second heater temperature H2=100-170 DEG C, draw ratio DR=1.5-1.8 times, false twisting speed ratio VR=1.5-1.75, second overfeeding OF2=3-7.5%, the 3rd overfeeding OF3=4-8%.
Further, Programmable controller described in step (3) controls feeding roller speed, refer to that Controlled by Programmable Controller one roller speed remains unchanged, control zero roller speed variable, and overfeeding wire feed during underfeed when carrying out relative to a roller speed, color silk and crude silk are alternately distributed in the periphery of finished net reeling, realize uniform numb grey effect.
Further, in step (3), zero roller is determined according to product style relative to the frequency of the underfeed rate of a roller speed or over feed rate(OFR), change.
Adopt the technical program, the present invention obtains following Advantageous Effects:
First, compared with staple fibre yarn spinning line, long filament production procedure is simple, apparatus and process debugging control is comparatively accurately convenient, in the calculating of particularly pulp furnish effect, long filament can more easily accurately calculate, and error is less, can ensure within 0.3% (error of more than 0.3% can produce the aberration comparing and can obviously distinguish), the fineness high uniformity of long filament own, plurality of raw materials is also closed still can not produce size deviation product quality being had to considerable influence.
Second, because colour-spun yarns part fiber directly adopts spinning solution painted, therefore fiber is directly knitting or woven, do not need printing and dyeing, greatly reducing dyeing water and dyeing and printing sewage environmental pollution, there is outstanding environmental-protection function, when the requirement of environmental improvement is more and more higher, show relative advantage." first spin after stain " product traditional to total environment damage ratio reduces more than 50%, and meeting the requirements of the times of " low-carbon (LC) manufacture ", is " water-saving and emission-reducing " product in textile industry.
3rd, product color is harmonious, firmly, fabric look intersects in vain, both regular, irregular again, color and luster is bright and do not stick with paste, fiber crops and not plate, active nature and style has diversity, meets the consumption demand that pursuit fabric is superior, style is personalized that people are growing.
4th, traditional weaving operation is put upside down, the link of dye in advance, after process reform, the fiber being mixed fibre by plurality of raw materials such as chemical fibres can be made, its advantage: one is the cylinder difference problem completely solving piece dyeing finishing, determine as long as look spins color, can accomplish that batch is unlimited; Two is that look spins the colouring problem solving various different physical characteristic fabrics, and various fibers mixture weaving, can produce the effect of performance complement, look spins and gives fabric unlimited development space.
5th, adopt the grey silk of long filament type of the present invention fiber crops not only to have outward appearance like the grey yarn of short fiber fiber crops, and its some performance is as dry in feel, bar, weaving running rate, clean environment degree etc. even will surmount the grey yarn of short fiber fiber crops, price is cheaper again simultaneously.At present, more than cotton yarn price is per ton at 30,000 yuan, terylene short fiber yarn is also about 20,000 5, and the grey silk price of long filament type fiber crops is less than 20,000 yuan, and Project Product, once succeed in developing, namely price defines significant competitive advantage.
Therefore the exploitation of this Project Product all has obvious advantage economic benefit or in properties of product.
Detailed description of the invention
Below to the grey effect composite deformation long filament production technology of a kind of environment-friendly type fiber crops of the present invention, be described in further details.
Embodiment 1
(1) POY silk A makes: spin on POY production line in routine section, half delustring polyester slice A is adopted to enter screw extruder through pre-crystallized, drying, section is extruded from head in screw extruder after melting, extruding, mixing, homogenizing, casing is entered again through filter, melt pipe, and sprayed from spinnerets by filament spinning component by after spinning pump accurate-metering, after cross air blowing device cooling curing, the winding shaping through oiling, after pre-the nozzle of interlace, obtained POY silk A.
In step (1), half described delustring polyester slice refers to polyester slice ripe on market; Drying condition: dry air dew point less than-80 DEG C, pre-crystallization temperature 170 DEG C, baking temperature 165 DEG C, drying time 6, h, made polyester slice moisture content≤0.003%; Product specification: 178dtex/96f, screw rod each district temperature 280/285/288/290/293 DEG C, spin manifold temperature 292 DEG C, the temperature of lateral blowing at 25 DEG C, wind speed 0.55m/s; Oil content: 0.35-0.40%, pre-network pressure 0.15MPa, spinning speed 3000m/min.
(2) coloured POY silk B makes: spin on POY production line in routine section, adopt large bright PET chips B after pre-crystallized, drying, mix by a certain percentage with the black agglomerate of drying and jointly enter screw extruder, extrude from head after melting, extruding, mixing, homogenizing in screw extruder, casing is entered again through filter, melt pipe, and sprayed from spinnerets by filament spinning component by after spinning pump accurate-metering, after cross air blowing device cooling curing, the winding shaping through oiling, after pre-the nozzle of interlace, obtained coloured POY silk B; Aforementioned proportion needs according to client and determines, and in the present embodiment, bright PET chips B mixes by the percentage by weight of 98.5:1.5 with the black agglomerate of drying.
In the present embodiment, the black agglomerate described in step (2), has the solid content of more than 30% and is greater than the COLOR FASTNESS of 5 grades, drying condition is: dry air dew point less than-70 DEG C, baking temperature: 135 DEG C, drying time: 6 hours, makes dry color master batch moisture control below 0.005%;
Large bright PET chips described in step (2) refers to polyester slice ripe on market; Drying condition: dry air dew point less than-80 DEG C, pre-crystallization temperature 165 DEG C, baking temperature 170 DEG C, drying time 6, h, made polyester slice moisture content≤0.003%; Screw rod each district temperature 270/275/280/285/290 DEG C, spin manifold temperature 275 DEG C, the temperature of lateral blowing at 23 DEG C, wind speed 0.55m/s; Oil content: 0.50%, pre-network pressure 0.1MPa, spinning speed 3050m/min.
In step (1) and step (2), the hole count of measuring pump rotating speed, spinnerets and spinning speed will mate mutually, make the POY silk A that obtains and POY silk B must have identical tensile property, namely there is identical percentage elongation, and its fiber number ratio controls at A:B=1-3:1, the fine density of A in the fine density of 40 ~ 356dtex/12 ~ 192f, B at 28 ~ 178dtex/12 ~ 144f.In the present embodiment, its fiber number ratio to control in the fine density of A:B=1.7:1, A in the fine density of 178dtex/96f, B at 105dtex/48f.
(3) control, add bullet, compound obtains: POY silk A and POY silk B, on two feeding elasticizer, after Programmable controller controls to carry out adding bullet and high-accuracy network compound after feeding roller speed, obtains the composite deformation long filament of the grey effect of environment-friendly type fiber crops.
In step (3), adopt Japanese 33H type two feeding terylene texturing machine, POY silk A is by zero roller feeding, POY silk B is by a roller feeding, both merge and jointly carry out heating, cools, false twisting, enter the second hot case sizing, network again after stretching before the first hot case, and last coiling and molding obtains the composite deformation long filament of the numb grey effect of environment-friendly type; Texturing craft condition is: silk speed V=300m/min, the first heater temperature H1=180 DEG C, the second heater temperature H2=165 DEG C, draw ratio DR=1.6 times, false twisting speed ratio VR=1.68, the second overfeeding OF2=6.88%, the 3rd overfeeding OF3=5.53%.
In the present embodiment, in step (3), it is that 187.5 m/min remain unchanged that described Programmable controller controls a roller speed, and zero roller speed is controlled by Programmable controller, and overfeeding wire feed during underfeed when carrying out relative to a roller speed 187.5m/min; The frequency of underfeed rate or over feed rate(OFR), change will be determined according to product style, and in the present embodiment, underfeed and over feed rate(OFR) are 0.5%, and period of change is 10 seconds, and color silk and crude silk are alternately distributed in the periphery of finished net reeling, realize uniform numb grey effect.
Embodiment 2
(1) POY silk A makes: spin on POY production line in routine section, omni-direction permutation section A is adopted to enter screw extruder through pre-crystallized, drying, section is extruded from head in screw extruder after melting, extruding, mixing, homogenizing, casing is entered again through filter, melt pipe, and sprayed from spinnerets by filament spinning component by after spinning pump accurate-metering, after cross air blowing device cooling curing, the winding shaping through oiling, after pre-the nozzle of interlace, obtained POY silk A.
In step (1), described omni-direction permutation section refers to polyester slice ripe on market, TiO2 content >=2.5%; Drying condition: dry air dew point less than-80 DEG C, pre-crystallization temperature 150 DEG C, baking temperature 145 DEG C, drying time 8, h, made polyester slice moisture content≤0.003%; Product specification: 115dtex/72f, screw rod each district temperature 280/285/285/290/290 DEG C, spin manifold temperature 288 DEG C, the temperature of lateral blowing at 25 DEG C, wind speed 0.45m/s; Oil content: 0.45%, pre-network pressure 0.2MPa, spinning speed 2800m/min.
(2) coloured POY silk B makes: spin on POY production line in routine section, adopt omni-direction permutation section B after pre-crystallized, drying, mix by a certain percentage with the light grey master batch of drying and jointly enter screw extruder, extrude from head after melting, extruding, mixing, homogenizing in screw extruder, casing is entered again through filter, melt pipe, and sprayed from spinnerets by filament spinning component by after spinning pump accurate-metering, after cross air blowing device cooling curing, the winding shaping through oiling, after pre-the nozzle of interlace, obtained coloured POY silk B; Aforementioned proportion needs according to client and determines, and in the present embodiment, polyester slice B mixes by the percentage by weight of 98:2 with the colored Masterbatch of drying.
In the present embodiment, the Masterbatch described in step (2), has the solid content of more than 30% and is greater than the COLOR FASTNESS of 5 grades, drying condition is: dry air dew point less than-70 DEG C, baking temperature: 135 DEG C, drying time: 6 hours, makes dry color master batch moisture control below 0.005%;
Omni-direction permutation section described in step (2) refers to polyester slice ripe on market, TiO2 content >=2.5%; Drying condition: dry air dew point less than-80 DEG C, pre-crystallization temperature 150 DEG C, baking temperature 145 DEG C, drying time 8, h, made polyester slice moisture content≤0.003%; Product specification: 83dtex/36f, screw rod each district temperature 270/275/275/280/280 DEG C, spin manifold temperature 275 DEG C, the temperature of lateral blowing at 25 DEG C, wind speed 0.50m/s; Oil content: 0.50%, pre-network pressure 0.2MPa, spinning speed 2850m/min.
In step (1) and step (2), the hole count of measuring pump rotating speed, spinnerets and spinning speed will mate mutually, make the POY silk A that obtains and POY silk B must have identical tensile property, namely there is identical percentage elongation, and its fiber number ratio controls at A:B=1-3:1, the fine density of A in the fine density of 40 ~ 356dtex/12 ~ 192f, B at 28 ~ 178dtex/12 ~ 144f.In the present embodiment, its fiber number ratio controls in the fine density of A:B=1.39:1, A fine density 115dtex/72f, B at 83dtex/36f.
(3) control, add bullet, compound obtains: POY silk A and POY silk B, on two feeding elasticizer, after Programmable controller controls to carry out adding bullet and high-accuracy network compound after feeding roller speed, obtains the composite deformation long filament of the grey effect of environment-friendly type fiber crops.
In step (3), adopt Japanese 33H type two feeding terylene texturing machine, POY silk A is by zero roller feeding, POY silk B is by a roller feeding, both merge and jointly carry out heating, cools, false twisting, enter the second hot case sizing, network again after stretching before the first hot case, and last coiling and molding obtains the composite deformation long filament of the numb grey effect of environment-friendly type; Texturing craft condition is: silk speed V=250m/min, the first heater temperature H1=170 DEG C, the second heater temperature H2=160 DEG C, draw ratio DR=1.68 times, false twisting speed ratio VR=1.73, the second overfeeding OF2=5.33%, the 3rd overfeeding OF3=4.35%.
In the present embodiment, in step (3), it is that 148.8m/min remains unchanged that described Programmable controller controls a roller speed, and zero roller speed is controlled by Programmable controller, and overfeeding wire feed during underfeed when carrying out relative to a roller speed 148.8m/min; The frequency of underfeed rate or over feed rate(OFR), change will be determined according to product style, and in the present embodiment, underfeed and over feed rate(OFR) are 0.8%, and period of change is 15 seconds, and color silk and crude silk are alternately distributed in the periphery of finished net reeling, realize uniform numb grey effect.
The all raw materials used in the present invention etc., except specified otherwise, are all conventional uses, can buy from market; The equipment used, except specified otherwise, is all conventional equipments, can buys from market; The process used, as illustrated, all referring to common process method, therefore repeating no more.In the present invention, refer in particular to as non-, all amounts, percentage are unit of weight.
The foregoing is only one embodiment of the present of invention, not to the restriction of this case design, all equivalent variations done according to the design key of this case, all fall into the protection domain of this case.
Claims (3)
1. the grey effect composite deformation long filament production technology of environment-friendly type fiber crops, is characterized in that: comprise the following steps:
(1) POY silk A makes: spin on POY production line in routine section, full-dull or half delustring or large bright PET chips A is adopted to enter screw extruder through pre-crystallized, drying, section is extruded from head in screw extruder after melting, extruding, mixing, homogenizing, casing is entered again through filter, melt pipe, and sprayed from spinnerets by filament spinning component by after spinning dosing pump accurate-metering, after cross air blowing device cooling curing, the winding shaping through oiling, after pre-the nozzle of interlace, obtained POY silk A;
(2) coloured POY silk B makes: spin on POY production line in routine section, adopt full-dull or half delustring or large bright PET chips B through pre-crystallized, after drying, mix by a certain percentage with the Masterbatch of drying and jointly enter screw extruder, through melting in screw extruder, extruding, mixing, extrude from head after homogenizing, again through filter, melt pipe enters casing, and sprayed from spinnerets by filament spinning component by after spinning dosing pump accurate-metering, after cross air blowing device cooling curing, through oiling, winding shaping after pre-the nozzle of interlace, obtained coloured POY silk B,
(3) control, add bullet, compound obtains: POY silk A and POY silk B, on two feeding elasticizer, after carrying out adding bullet and high-accuracy network compound, obtains the composite deformation long filament of the grey effect of environment-friendly type fiber crops after Controlled by Programmable Controller feeding roller speed;
In step (1), drying condition: dry air dew point less than-80 DEG C, pre-crystallization temperature 150 ~ 170 DEG C, baking temperature 140 ~ 170 DEG C, drying time, 6-8 hour, made polyester slice moisture content≤0.003%; The each district temperature 280-293 DEG C of screw rod, spin manifold temperature 288-295 DEG C, the temperature of lateral blowing at 20-25 DEG C, wind speed 0.4-0.7m/s; Oil content: 0.35-0.45%, pre-network pressure 0.1-0.2MPa, spinning speed 2800-3300m/min;
In step (2), drying condition: dry air dew point less than-80 DEG C, pre-crystallization temperature 150 ~ 170 DEG C, baking temperature 135-170 DEG C, drying time, 6-8 hour, made polyester slice moisture content≤0.003%; The each district temperature 270-293 DEG C of screw rod, spin manifold temperature 270-285 DEG C, the temperature of lateral blowing at 20-25 DEG C, wind speed 0.35-0.55m/s; Oil content: 0.45-0.55%, pre-network pressure 0.1-0.2MPa, spinning speed 2700-3200m/min;
In step (1) and step (2), the hole count of measuring pump rotating speed, spinnerets and spinning speed will mate mutually, the POY silk A that obtains and POY silk B is made to have identical tensile property, namely there is identical percentage elongation, and its fine density ratio controls at A:B=1 ~ 3:1, the fine density of A in the fine density of 40 ~ 356dtex/12 ~ 192f, B at 28 ~ 178dtex/12 ~ 144f;
The Masterbatch of drying described in step (2), have the solid content of more than 30% and be greater than the COLOR FASTNESS of 5 grades, drying condition is: dry air dew point less than-70 DEG C, baking temperature: 125-145 DEG C, drying time: 6-8 hour, make dry color master batch moisture control below 0.005%;
Controlled by Programmable Controller feeding roller speed described in step (3), refer to that Controlled by Programmable Controller one roller speed remains unchanged, control zero roller speed variable, and overfeeding wire feed during underfeed when carrying out relative to a roller speed, color silk and crude silk are alternately distributed in the periphery of finished net reeling, realize uniform numb grey effect;
In step (3), zero roller will be determined according to product style relative to the frequency of the underfeed rate of a roller speed or over feed rate(OFR), change.
2. the grey effect composite deformation long filament production technology of a kind of environment-friendly type fiber crops as claimed in claim 1, it is characterized in that: in step (3), POY silk A is by zero roller feeding, POY silk B is by a roller feeding, both merge and jointly carry out heating, cools, false twisting, enter the second hot case sizing, network again after stretching before the first hot case, and last coiling and molding obtains the composite deformation long filament of the numb grey effect of environment-friendly type.
3. the grey effect composite deformation long filament production technology of a kind of environment-friendly type fiber crops as claimed in claim 1, it is characterized in that: in step (3), texturing craft condition is: silk speed V=180-350m/min, first heater temperature H1=170-200 DEG C, second heater temperature H2=100-170 DEG C, draw ratio DR=1.5-1.8 times, false twisting speed ratio VR=1.5-1.75, second overfeeding OF2=3-7.5%, the 3rd overfeeding OF3=4-8%.
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