CN107012528A - A kind of hollow polylactic acid short-fiber of cotton fine-denier and its production method - Google Patents
A kind of hollow polylactic acid short-fiber of cotton fine-denier and its production method Download PDFInfo
- Publication number
- CN107012528A CN107012528A CN201710226309.6A CN201710226309A CN107012528A CN 107012528 A CN107012528 A CN 107012528A CN 201710226309 A CN201710226309 A CN 201710226309A CN 107012528 A CN107012528 A CN 107012528A
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- Prior art keywords
- hollow
- fiber
- denier
- polylactic acid
- pla
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Classifications
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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
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
- D01F6/62—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyesters
- D01F6/625—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyesters derived from hydroxy-carboxylic acids, e.g. lactones
-
- 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
-
- 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
-
- 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
- D01D5/12—Stretch-spinning methods
-
- 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
- D01D5/24—Formation of filaments, threads, or the like with a hollow structure; Spinnerette packs therefor
Abstract
The present invention relates to a kind of hollow polylactic acid short-fiber of cotton fine-denier and its production method, the cross sectional shape of the chopped fiber is annular, and the line density of fiber is 2.40~2.42dtex, and degree of hollowness is 17~19%.Its production method, comprises the following steps：（1）It is continuous drying by polylactic acid slice using PLA as raw material；（2）Enter the spinning manifold with measuring pump after screw extruder is melted, filtered, cool down, oil, winding, the hollow spun filament of PLA is made；（3）The hollow spun filament drawn of PLA, qualitative, curling, drying, cut off operation, obtain the hollow polylactic acid short-fiber of cotton fine-denier.The hollow polylactic acid short-fiber of cotton fine-denier of the present invention can improve warmth retention property, bulkiness, gas permeability and the feel of hollow acid fiber by polylactic.
Description
Technical field
The present invention relates to fibrous woven technical field, especially a kind of hollow polylactic acid short-fiber of cotton fine-denier and its production
Method.
Background technology
At present, the characteristics of fine-denier doughnut has had fine-denier concurrently and be hollow, is the optimal original for making cold-proof underwear of new generation
Material.The hollow PLA of fine-denier cotton and viscose glue, cotton, tencel, bamboo fiber blended, the style with uniqueness in terms of its feel, have
Wide market prospects.Japan, the U.S. take its place in the front ranks of the world in fibre in differentiation, are achieved very in hollow research and development
Many achievements.There are the hollow PLA of cotton for weaving in Nai Qier companies of the U.S., by cotton PLA production technology and PLA
Hollow fiber technology combines, and devises special spinning jet, develops the hollow acid fiber by polylactic of fine-denier cotton and carries out technique skill
Art research.
Its superior performance of the hollow acid fiber by polylactic of fine-denier cotton, can for manufacture quality easily, the middle thickness of good hand feeling
Fancy suiting, manufacture has the multifilament stockings of higher abrasion resistance, warmth retention property, flexibility.May also be used for manufacture have transparency it is low, protect
Warm up the soft various knitted fabrics of good property, comfortable feel, gloss.In addition, participating in blending weaving wool-like fabric with profiled filament
Result in preferable wool-like effect.But the warmth retention property of the existing hollow acid fiber by polylactic of fine-denier cotton, bulkiness, gas permeability and
Feel is not good enough.
The content of the invention
To solve problems of the prior art, the present invention propose a kind of hollow polylactic acid short-fiber of cotton fine-denier and its
Production method, it is possible to increase warmth retention property, bulkiness, gas permeability and the feel of hollow acid fiber by polylactic.
To achieve the above object, the present invention proposes a kind of hollow polylactic acid short-fiber of cotton fine-denier, and its cross sectional shape is circle
Annular, the line density of fiber is 2.40~2.42dtex, and degree of hollowness is 17~19%.
A kind of method for producing the hollow polylactic acid short-fiber of cotton fine-denier, method comprises the following steps：（1）Using PLA as original
Material, it is continuous drying by polylactic acid slice；（2）Enter the manifold with measuring pump after screw extruder is melted, filtered
Body, cool down, oil, winding, the hollow spun filament of PLA is made；（3）The hollow spun filament drawn of PLA, qualitative, curling, baking
Dry, cut off operation, obtains the hollow polylactic acid short-fiber of cotton fine-denier；The special-shaped spinneret orifice of spinneret is in circle in the spinning manifold
Ring-type, annulus is made up of three equal-sized circular arcs, and spinning temperature is 225~230 DEG C；The cooling dries cold using ring
But, ring cold air blast velocity is 0.9~1.4m/s；Temperature is 80~90 DEG C during the stretching.
The special-shaped hole depth L of the spinneret orifice and special-shaped bore dia DnRatio be L/Dn>2, wherein L are 0.6~0.8mm,
Special-shaped bore dia DnFor 0.274~0.284mm.
The special-shaped hole depth L of the spinneret orifice is 1 μm, and the outside diameter R of spinneret orifice is 1.3 μm, two sections of phases of spinneret orifice
The slit width W of adjacent circular arc is 0.13 μm.
Beneficial effect：
Circular shaped spinneret orifice of the invention by setting, and annulus is using three equal-sized circular arcs compositions, and pass through
Optimizing and revising for production technology, is capable of the hollow polylactic acid short-fiber of cotton fine-denier of steady production 2.40~2.42dtex specifications.
Degree of hollowness obtains larger raising, and hollow circular ring outer wall closes higher, imperforation fiber.So as to improve the soft of fabric
Soft feel, is more suitable for cold-proof underwear, socks, gloves, insulated cold wear lining etc..
Brief description of the drawings
Fig. 1 is the structural representation of the spinneret orifice of the spinneret of the use of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The present invention proposes a kind of hollow polylactic acid short-fiber of cotton fine-denier, and its cross sectional shape is annular, and the line of fiber is close
Spend for 2.40~2.42dtex, degree of hollowness is 17~19%.
A kind of method for producing the hollow polylactic acid short-fiber of cotton fine-denier, method comprises the following steps：
Raw material PLA：Inherent viscosity 1.27dtex/g, 175 DEG C of fusing point；Equipment is：Beijing Zhong Lizhi machines Engineering Co., Ltd.
Polylactic acid slice is melted by screw extruder, and into the spinning manifold with measuring pump, melt is passed through into metering
Hollow profiled spinneret component is pumped into, the as-spun fibre of hollow profiled is sprayed；By oiling and leading after as-spun fibre cooling
Roller falls into fiber barrel through sunflower wheel extruding；36 barrels or 72 barrels are filled after the hollow spun filament of PLA draws a boundling through silk guide frame,
With Shaoyang slhv802-09-1968 types PLA processing combination machine carries out three road drawing-offs, oil, fold silk, curling, drying, cut-out,
Pack, weigh, identify；Finally give a kind of hollow polylactic acid short-fiber of cotton fine-denier.
The special-shaped spinneret orifice 1 of spinneret is in annular shape in spinning manifold, and annulus is made up of three equal-sized circular arcs 11.
Experiment takes D to be 2.2dtex, and V is that 1000-1300m/min obtains Q and is（6.61-7.93）×10-3cm3/s.
The Dn of profiled holes：It is demonstrated experimentally that polylactic acid melt is in shear rate（R) it is（3.2-3.8）Have during × 103s-1 good
Good spinnability.By formula（2）Understand, when Q is definite value, r is relevant with hole shape and size.
r=4Q/πR2 (2)
Dn=2R (3)
In formula：The diameter of a circle of R- circular cross-sections.It is 3.5 × 103s-1 to take v, and R is 0.137-0.142mm, and Dn is 0.274-
0.284mm。
Profiled holes size：Special-shaped size can be primarily determined that by Dn.
Rule of thumb in formula Dn=4g/s (4)：The cross-sectional area of g- emptying apertures, the girth in s- holes.
The special-shaped hole area of the 2.2dtex hollow spinneret plates of actual design is 0.245mm2, the Zhou Changwei 3.495mm, Dn in hole
For 0.28mm.
Rule of thumb, general special-shaped hole depth（L）Take 0.7mm compared with Dn for 0.6-0.8mm experiments L, L/Dn is more than
2.Experience have shown that, not only line density is uneven when L/Dn is more than 2 significantly declines, and the uniformity of fiber degree of profile is also improved.
In terms of technological angle, there is close relationship between fiber degree of profile and spinnability.Such as melt property, cooling condition, spinning temperature
Degree etc..Therefore it must select that the requirement of spinnability can be met, the optimal spinning condition of certain degree of profile can be reached again.
The special-shaped hole depth L of spinneret orifice and special-shaped bore dia Dn ratio are L/Dn>2, wherein L are 0.6~0.8mm, different
Type hole diameter Dn is 0.274~0.284mm.
Spinning temperature：Selected spinning speed is 1200m/min, carries out the contrast test of different spinning temperatures, its is hollow
Fibrous physics index
Table 1：Influence of the spinning temperature to doughnut physical index
| Spinning temperature | Line density dtex | Extension at break % | Fracture strength | Degree of hollowness |
| 225℃ | 2.42 | 366.17 | 1.24 | 4.86 |
| 230℃ | 2.40 | 371.28 | 1.27 | 4.0 |
As seen from Table 1, with the rise of spinning temperature, the fracture strength elongation change of doughnut is little, the fracture of fiber
Intensity has declined, degree of hollowness reduction.This is due to that spinning temperature is high, and melt viscosity is small, and melt goes out expanded phenomenon after spinneret orifice
Substantially reduce, surface tension also declines therewith, be that melt stream produces surface atrophy, so that chamber portion diminishes, spin fibre
The hollow reduction of dimension.The low then melt viscosity of spinning temperature is big.Melt-forming resistance and surface tension are big, are conducive to hollow shape
Into.But melt temperature is too low, then viscosity increases, and the closure that melt goes out in spinneret orifice round mouth is difficult, it is difficult to generate it is hollow, when serious
Make melt in the aerial shearing stress increase of spinneret, the adhesion between melt and pore tube wall weakens, and melt produces cunning on wall
Move, cause unstable flowing, cause melt fracture, underfed occurs in spinning, produce hardhead silk, filament, therefore spinning temperature
Degree selection is at 225 DEG C -230 DEG C.
Ring cold air blast velocity：As shown in Table 2, as ring blows the raising of speed, the hollow increasing of fiber.This is due to air
Thermal conductivity factor it is low, as ring is dried the increase of speed, wind-warm syndrome reduction, cooling condition aggravation, the solidification rate of melt stream is accelerated,
So that having little time atrophy and rapid curing spinning the chamber portion that is formed in journey, be conducive to the generation of doughnut internal cavity, institute
It is high with hollowness of fibre.But cold air blast velocity is excessive, wind-warm syndrome is too low, and melt, which goes out, closes difficulty after spinning nozzle, hollow to be difficult to be formed, together
When strand can be caused to rock turbulence, export not smooth, production is difficult to stabilization.Therefore suitable cold air blast velocity is 0.9- in testing
1.4m/s。
Influence of the ring cold air blast velocity of table 2 to hollowness of fibre
| Cold air blast velocity m/s | Degree of hollowness % | Cold air blast velocity m/s | Degree of hollowness % |
| 0.8 | 4.86 | 1.2 | 4.67-5.7 |
| 1.0 | 4.8-5.7 | 1.4 | 5-6.5 |
[draft temperature：As shown in Table 3, with the rise of draft temperature, the elongation of fiber, intensity all decline, and draft temperature is to fiber
Degree of hollowness does not influence substantially, and experiment selection temperature is 80 DEG C -90 DEG C and is advisable.
Influence of the draft temperature of table 3 to fiber mechanicses and degree of hollowness
| Temperature DEG C | Line density dtex | Elongation at break % | Fracture strength cn/dtex |
| 80 | 2.42 | 25 | 4.2 |
| 90 | 2.40 | 23 | 3.9 |
Note：235 DEG C of ring blowing 1.2m/s of spinning temperature
L, R, W value to spinneret orifice on spinneret is corrected.Wherein L is the depth of spinneret orifice, and R is the spinneret orifice center of circle outside
The radius of circular arc, W is the slit width of two sections of adjacent circular arcs of spinneret orifice, and spinneret orifice L is big under normal spinning, single hole extrusion capacity
Greatly, the sectional area of fiber is big, and degree of hollowness is small；L is small, and single hole melt extrusion amount is small, and the degree of hollowness of fiber is big.But L is too small, spinning
Fibre wall it is too thin, hollow regular low, hollow deformation, the too small spinneret processing of L and cleaning difficulty increase, W numerical value is smaller,
The easier closure of fiber, but when having influence on out spinneret orifice extraneous air entrance, hollow deformation regularity is low, and center section
Can be by component mesohigh（Generally higher than 10MPA）Influence and deform, R numerical value will be adjusted accordingly with W numerical value, because
This determines the suitable dimension of spinneret.L is 1 μm, and R is 1.3 μm, and W is 0.13 μm, and R is the half of the spinneret orifice center of circle to external arc
Footpath, the distance between the Inner arc of spinneret orifice and external arc d are 0.3 μm.The fresh processed spinneret of counterweight carries out Spinning, knot
Fruit degree of hollowness brings up to 17% by original 5.77%, and hollow circular ring outer wall closes higher, imperforation fiber.Specific quality index
It is shown in Table 4
The hollow polylactic acid short-fiber physical property of the cotton fine-denier of table 4
| Project | Hollow 2.42dtex |
| Fracture strength (cn.dtex) | 4.5 |
| Elongation at break | 27 |
| Modulus | 18 |
| Overlength fiber rate | 0.2 |
| Over-length fibre content 100/mg | 0.7 |
| Fault 100/mg | 0.2 |
| Crispation number 25/ | 10 |
| Dry-hot shrinkage % | 8 |
| Degree of hollowness | 19 |
2.42 × the 38mm produced by above step PLA hollow core staple fibers, aft-loaded airfoil performance is good.It is coiled preferable, cotton
Net is clear, and the advantages of yarn breakage intensity is high, product quality has reached conventional cotton acid fiber by polylactic quality characteristic.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modifications, equivalent substitutions and improvements made within refreshing and principle etc., should be included in the scope of the protection.
Claims (4)
1. a kind of hollow polylactic acid short-fiber of cotton fine-denier, it is characterised in that：The cross sectional shape of the chopped fiber is annular, fine
The line density of dimension is 2.40~2.42dtex, and degree of hollowness is 17~19%.
2. the method for the production hollow polylactic acid short-fiber of cotton fine-denier as claimed in claim 1, it is characterised in that including following
Step：
（1）It is continuous drying by polylactic acid slice using PLA as raw material；
（2）Enter the spinning manifold with measuring pump after screw extruder is melted, filtered, cool down, oil, winding, be made
The hollow spun filament of PLA；
（3）The hollow spun filament drawn of PLA, qualitative, curling, drying, cut off operation, obtain the hollow PLA of cotton fine-denier
Chopped fiber；The special-shaped spinneret orifice of spinneret is in annular shape in the spinning manifold, and annulus is made up of three equal-sized circular arcs,
Spinning temperature is 225~230 DEG C；The cooling uses ring wind quenching, and ring cold air blast velocity is 0.9~1.4m/s；The stretching
Shi Wendu is 80~90 DEG C.
3. method as claimed in claim 2, it is characterised in that：The special-shaped hole depth L of the spinneret orifice and special-shaped bore dia Dn's
Ratio is L/Dn>2, wherein L are 0.6~0.8mm, special-shaped bore dia DnFor 0.274~0.284mm.
4. method as claimed in claim 3, it is characterised in that：The special-shaped hole depth L of the spinneret orifice is 1 μm, spinneret orifice
Outside diameter R is 1.3 μm, and the slit width W of two sections of adjacent circular arcs of spinneret orifice is 0.13 μm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710226309.6A CN107012528A (en) | 2017-04-08 | 2017-04-08 | A kind of hollow polylactic acid short-fiber of cotton fine-denier and its production method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710226309.6A CN107012528A (en) | 2017-04-08 | 2017-04-08 | A kind of hollow polylactic acid short-fiber of cotton fine-denier and its production method |
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| CN107012528A true CN107012528A (en) | 2017-08-04 |
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|---|---|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109023564A (en) * | 2018-09-14 | 2018-12-18 | 安徽丰原生物材料股份有限公司 | A kind of preparation method of polylactic acid coloured cut staple |
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|---|---|---|---|---|
| CN2642795Y (en) * | 2003-08-29 | 2004-09-22 | 上海第十化学纤维厂 | Fine-denier round hollow polyester staple fiber |
| CN101608346A (en) * | 2009-07-24 | 2009-12-23 | 中国科学院宁波材料技术与工程研究所 | A kind of profiled polylactic acid fiber and preparation method thereof |
| CN102995148A (en) * | 2011-09-13 | 2013-03-27 | 中国石油化工股份有限公司 | Production method of normal-temperature normal-pressure cationic dyeable fine-denier hollow polyester staple fiber |
| CN105002579A (en) * | 2015-05-18 | 2015-10-28 | 浙江恒逸高新材料有限公司 | High-hollowness-degree fine-denier polyester filament yarn and preparation method thereof |
| CN205035509U (en) * | 2015-09-30 | 2016-02-17 | 江苏江南高纤股份有限公司 | Spinneret that uses in thin dawn cavity polyester staple fiber production |
-
2017
- 2017-04-08 CN CN201710226309.6A patent/CN107012528A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2642795Y (en) * | 2003-08-29 | 2004-09-22 | 上海第十化学纤维厂 | Fine-denier round hollow polyester staple fiber |
| CN101608346A (en) * | 2009-07-24 | 2009-12-23 | 中国科学院宁波材料技术与工程研究所 | A kind of profiled polylactic acid fiber and preparation method thereof |
| CN102995148A (en) * | 2011-09-13 | 2013-03-27 | 中国石油化工股份有限公司 | Production method of normal-temperature normal-pressure cationic dyeable fine-denier hollow polyester staple fiber |
| CN105002579A (en) * | 2015-05-18 | 2015-10-28 | 浙江恒逸高新材料有限公司 | High-hollowness-degree fine-denier polyester filament yarn and preparation method thereof |
| CN205035509U (en) * | 2015-09-30 | 2016-02-17 | 江苏江南高纤股份有限公司 | Spinneret that uses in thin dawn cavity polyester staple fiber production |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109023564A (en) * | 2018-09-14 | 2018-12-18 | 安徽丰原生物材料股份有限公司 | A kind of preparation method of polylactic acid coloured cut staple |
| CN109023564B (en) * | 2018-09-14 | 2023-05-23 | 安徽丰原生物纤维股份有限公司 | Preparation method of polylactic acid colored short fibers |
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Application publication date: 20170804 |