CN105729745B - PLA bi-component composite fiber spinning production equipment - Google Patents
PLA bi-component composite fiber spinning production equipment Download PDFInfo
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- CN105729745B CN105729745B CN201610233406.3A CN201610233406A CN105729745B CN 105729745 B CN105729745 B CN 105729745B CN 201610233406 A CN201610233406 A CN 201610233406A CN 105729745 B CN105729745 B CN 105729745B
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- melt
- guide shell
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- batch mixing
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/285—Feeding the extrusion material to the extruder
- B29C48/288—Feeding the extrusion material to the extruder in solid form, e.g. powder or granules
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/05—Filamentary, e.g. strands
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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
-
- 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
-
- 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
- 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
- D01F1/10—Other agents for modifying properties
-
- 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
- D01F6/88—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds
- D01F6/92—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of polyesters
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D13/00—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft
-
- 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
- D01D5/32—Side-by-side structure; Spinnerette packs therefor
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Abstract
PLA bi-component composite fiber spinning production equipment, including aggregation framework, drying tower, feed bin, spinning screw extruder and spinning manifold, agitator tank, first poly- tank and whole poly- tank are sequentially provided with aggregation framework from top to bottom, stirring pot bottom is connected by the first conveying pipeline with first poly- tank top, and the first conveying pipeline is provided with PLA pre-polymerization mixing device；The first spinning pump, the second spinning pump and double spray orifice parallel type filament spinning components are provided with spinning manifold；Sound integrated pipeline formula mixing device is equipped with first melt pipe and the second melt pipe.Present invention ensure that the melt in prepolymerization pipe flows downward under constant speed state, and make melt temperature in prepolymerization pipe also basically identical, the present invention directly sets some groups of batch mixing units on the first melt pipe, eliminate and mixing system is installed on conveyance conduit, cost is saved, reach the purpose of uniform batch mixing, conveying and batch mixing efficiency greatly improve.
Description
Technical field
The invention belongs to PLA spinning production technical field, more particularly to a kind of PLA bi-component composite fiber spinning
Production equipment.
Background technology
PLA（PLA）Fiber is a kind of degradable biological fiber, and its production method still, is gathered similar to polyester fiber
The production process of acid fiber is easily degraded, especially drying process, according to knowhow, to reach spinning technique requirement
Aridity, PLA dry chip（PLA）Moisture content must be in below 30PPm, according to experiment；The hot air temperature of drying material
100~110 DEG C are generally required, 6~8 hours drying times.
Chemical examination discovery is carried out according to drying front and rear polylactic acid slice；PLA reaches before drying to dried viscosity drop
More than 1/3rd.Although this explanation can avoid the hydrolytic degradation caused by water content is too high by dry polylactic acid slice
Reaction, but drying process has also significantly caused the degraded of polylactic acid slice.Have a strong impact on the strength of fiber.
The production of PLA bi-component composite fiber needs two groups of different molecular weights（Melt viscosity）Melt, i.e.,；It is a kind of
For the melt of higher degrees of polymerization, another kind is the melt of low degree.
If carrying out melt spinning with traditional indirect spinning method, low molecular weight pdlla section can be run into because of chip drying
Caused by the problem degraded.Because drying temperature and the molecular weight of polylactic acid slice are into positive correlation, molecular weight is higher, then may be used
To there is higher drying temperature, molecular weight is relatively low can not then to use higher drying temperature, due to the gasification of moisture at ambient pressure
Temperature is 100 DEG C, if processing is dried using less than 100 DEG C of hot-air, is extremely difficult to drying effect.Therefore it is, relatively low
The section of molecular weight, it is difficult to which processing is dried.
In addition, poly lactic acid polymerized process includes pre-polymerization and gathered eventually.The melt for needing to polymerize is first had to by pre-polymerization, pre-polymerization
Equipment is the tank body of a vertical type cylinder shape, and prepolymerization pipe is vertically provided with the top of tank body.Need prepolymerized molten
Body quantitatively enters in prepolymerization pipe from the upper end of prepolymerization pipe, flows down to by self gravitation and steadily tank body from the top down
It is interior.Due to melt and the friction factor of prepolymerization tube wall, the melt of prepolymerization tube hub flows downward speed than prepolymerization pipe
The downward flowing velocity of melt at tube wall is fast, and the temperature at prepolymerization tube wall and the temperature of prepolymerization tube hub
There is difference.And preferably situation is；1st, melt flows downward under constant speed state；2nd, melt flows downward in prepolymerization pipe
When the tube wall of each aspect and the solution temperature of prepolymerization tube hub be desirably also；3rd, due to poly- for conveying after gathering eventually
The conveyance conduit of lactic acid is longer, close to tube wall high polymer molten viscosity it is especially big, polylactic acid melt in course of conveying because
Molecular weight of high polymer wider distribution caused by melt flow is uneven（It is uneven）Problem, impurity can not effectively filter out, from
And have influence on spinning quality.To reach this purpose, need to assemble array batch mixing preheater in prepolymerization pipe, to meet polymerization technique
Requirement.
The content of the invention
The present invention is in order to solve weak point of the prior art, there is provided it is a kind of can be by prepolymerization inside pipe wall and center
Melt keeps basic constant speed to flow downward and prepolymerization inside pipe wall can be swapped with the melt at center and mixes keeping temperature
Unanimously, the PLA bi-component composite fiber spinning production equipment being well mixed during poly- rear melt conveying eventually.
In order to solve the above technical problems, the present invention adopts the following technical scheme that：The spinning of PLA bi-component composite fiber is given birth to
Produce equipment, including aggregation framework, drying tower, feed bin, spinning screw extruder and spinning manifold, in aggregation framework from top to bottom according to
Secondary to be provided with agitator tank, first poly- tank and whole poly- tank, stirring pot bottom is connected by the first conveying pipeline with first poly- tank top, the first conveying
Pipe is provided with PLA pre-polymerization mixing device, the first autocontrol valve and the first measuring pump, and first poly- pot bottom passes through the second conveying
Pipe is connected with poly- tank top eventually, and the second conveying pipeline is provided with the second autocontrol valve and the second measuring pump；
The first spinning pump, the second spinning pump and double spray orifice parallel type filament spinning components are provided with spinning manifold, the
Charging aperture of the discharging opening of one spinning pump and the second spinning pump respectively with double spray orifice parallel type filament spinning components is connected；
Poly- pot bottom is connected by the first melt pipe with the charging aperture of the first spinning pump eventually；
The outlet of drying tower and the import of feed bin connect, and the outlet of feed bin is entered by tremie pipe and spinning screw extruder
Mouth connection, tremie pipe are provided with meter, and the discharging opening of spinning screw extruder passes through the second melt pipe and the second spinning meter
Measure the charging aperture connection of pump；
On first melt pipe first filter, the 3rd measuring pump and the first sound one are sequentially provided with along melt flows direction
Body duct type mixing device, the second filter and the second sound one are sequentially provided with along melt flows direction on the second melt pipe
The construction phase of duct type mixing device, the first sound integrated pipeline formula mixing device and the second sound integrated pipeline formula mixing device
Together；
PLA pre-polymerization mixing device includes the prepolymerization pipe that is arranged in vertical, in prepolymerization pipe from top to bottom at least
Provided with two batch mixing preheaters, all equal structures of batch mixing preheater are identical；
Each batch mixing preheater includes the first upper conical guide shell, the second upper conical water conservancy diversion with same center line
Cylinder, the first inferior pyramidal guide shell, the second inferior pyramidal guide shell, upper shunting cone cylinder and lower shunting cone cylinder；
First upper conical guide shell and the first inferior pyramidal guide shell are upper coarse and lower fine and upper and lower permeable structures, the first epicone
Shape guide shell bottom diameter is more than the second upper conical guide shell bottom diameter, the second upper conical guide shell and the second inferior pyramidal water conservancy diversion
Cylinder is up-thin-low-thick and upper and lower permeable structures, in the first upper conical guide shell bottom diameter and the second upper conical guide shell upper end
Footpath is equal, and the first inferior pyramidal guide shell bottom diameter is equal with the second inferior pyramidal guide shell upper-end inner diameter, the first upper conical water conservancy diversion
Cylinder upper end outer, the second upper conical guide shell lower end outer, the first inferior pyramidal guide shell upper end edge and the second inferior pyramidal water conservancy diversion
Cylinder lower end edge is fixedly connected with prepolymerization inside pipe wall, the first upper conical guide shell lower end edge and the second upper conical guide shell
Upper end edge is fixedly connected, and the first upper conical guide shell lower end edge is fixedly connected with the second upper conical guide shell upper end edge,
First inferior pyramidal guide shell lower end edge is fixedly connected with the second inferior pyramidal guide shell upper end edge；
Upper shunting cone cylinder is the structure that top sharply blocks, bottom is open, and lower shunting cone cylinder sharply blocks for bottom, top
Open structure, upper shunting cone cylinder bottom diameter are equal to lower shunting cone cylinder upper-end inner diameter, and upper shunting cone cylinder bottom diameter is less than pre-
It polymerize bore, upper shunting cone cylinder lower end edge is fixedly connected with lower shunting cone cylinder upper end edge；Upper shunting cone cylinder and lower shunting
Cone cylinder outer wall is fixedly connected by heating agent conduit with prepolymerization inside pipe wall；
The upper end of upper shunting cone cylinder be higher than the first upper conical guide shell upper end edge, under the lower lower end and second for shunting cone cylinder
Conical flow guiding cylinder upper end edge flushes；
Circulation road under formation tube wall melt between upper spreader tube outer surface and the first inferior pyramidal water conservancy diversion tube outer surface, lower point
Circulation road under blend melt is formed between flow cone tube outer surface and the first inferior pyramidal water conservancy diversion tube outer surface；
Upper spreader tube outer surface is provided with central melt flow dividing structure, lower end and the tube wall melt of central melt flow dividing structure
Lower circulation road lower end crosses.
First sound integrated pipeline formula mixing device includes fixed -piping and batch mixing unit, and batch mixing unit includes coaxial set
Static the batch mixing pipeline and dynamic mixture pipeline put, the right-hand member flange of the left end of dynamic mixture pipeline and static batch mixing pipeline connect
Connect, dynamic screw dividing plate is provided with dynamic mixture pipeline, dynamic screw dividing plate by dynamic mixture pipeline axially inside divide by direction
The first semicircle helical duct and the second semicircle helical duct are divided into, dynamic screw dividing plate is matched somebody with somebody with dynamic mixture inner-walls of duct gap
Close；Static ribbon dividing plate is provided with static batch mixing pipeline, static ribbon dividing plate by static batch mixing pipeline axially inside divide by direction
The 3rd semicircle helical duct and the 4th semicircle helical duct are divided into, static ribbon dividing plate is fixed with static batch mixing inner-walls of duct to be connected
Connect；
Plane where the both ends of dynamic screw dividing plate and static ribbon dividing plate is each perpendicular in dynamic mixture pipeline
Mandrel line, dynamic screw dividing plate right part center are provided with dynamic cone tank, and dynamic screw dividing plate left part center is provided with dynamic and pushed up
Point, static ribbon dividing plate right part center are provided with static cone tank, and static ribbon dividing plate left part center is top provided with static state, moves
The top left end of state is withstood in static cone tank；
Fixed -piping left end is connected with dynamic mixture pipeline right-hand member flange, is provided with support in fixed -piping, support is provided with
Stationary center, stationary center left end are withstood in dynamic cone tank.
The quantity of batch mixing unit is more than or equal to two groups, and flange connects between two adjacent groups batch mixing unit, one group of batch mixing unit
Static top left end withstand in the dynamic cone tank of one group of adjacent batch mixing unit, one group of batch mixing of fixed -piping and low order end
Unit connects.
The length of static batch mixing pipeline is less than the length of dynamic mixture pipeline.
Central melt flow dividing structure includes shunt cylinder and several isocons, and shunt cylinder and isocon are each provided at point
On flow cone cylinder, shunt cylinder open top, shunt cylinder upper end edge is horizontal, and isocon is wide at the top and narrow at the bottom, all isocon edges of isocon
Upper shunting cone cylinder circumferencial direction is evenly arranged, and isocon upper end connects with shunt cylinder lower end, and shunting infratubal port melts positioned at tube wall
Circulation road lower end and the outside of circulation road upper end intersection under blend melt under body.
Upper shunting cone cylinder is internally formed preheating cavity, the first inferior pyramidal guide shell and the second inferior pyramidal with lower shunting cone cylinder
Hot circulating fluid medium has been passed through in preheating cavity under being internally formed of guide shell, upper preheating cavity and lower preheating cavity；Heating agent conduit
Inner to be connected with upper preheating cavity, heating agent external catheter end is stretched out outside prepolymerization pipe.
Using above-mentioned technical proposal, PLA pre-polymerization mixing device is set to carry out batch mixing warm on the first conveying pipeline
For：Melt flows downward in prepolymerization pipe, and the melt A at prepolymerization tube hub enters shunting along upper shunting cone surface
Cylinder, melt A are flowed to circulation road lower end under tube wall melt and crossed with circulation road upper end under blend melt automatically by isocon again
The outside at place, at the same time, the melt B close to prepolymerization tube wall are entered under tube wall melt by the first upper conical guide shell
In circulation road, flow under tube wall melt and be located at melt A top behind circulation road lower end, be i.e. melt A and melt B enter blend melt
After lower circulation road, melt A is located at lower floor, and melt B is located at upper strata, when melt A and melt B are flowed under blend melt under circulation road
When bringing out mouthful, melt B is located among melt A, i.e., melt A is transformed into by center and continues to flow downward along tube wall, and melt B is by tight
Adjacent tube wall, which is transformed into center, to be continued to flow downward, and during transposition, melt A and melt B are also definitely mixed.
During melt mixed transposition, hot circulating fluid medium is passed through in upper preheating cavity and lower preheating cavity, heat is followed
Ring fluid media (medium) can add thermal medium such as according to technological requirement；Biphenyl Ether, conduction oil etc., are preheated to melt, with side
Just prepolymerization process is controlled.The present invention takes no dead angle design in the junction of all parts.From upper in a piece prepolymerization pipe
Multigroup batch mixing preheater can be installed under.
Relatively small molecular weight polylactic acid raw material is eliminated to compared with small molecule using the technique of direct fabrics after polymerization in the present invention
The defects of rear indirect spinning is dried in amount polylactic acid slice.First sound integrated pipeline formula batch mixing is set on the first melt pipe
Device, have the advantages that：In the presence of the 3rd measuring pump, the polylactic acid melt after polymerization is entered by fixed -piping,
When sticky melt under high pressure by dynamic mixture pipeline when, dynamic screw dividing plate starts to revolve under the promotion of melt
Turn, the dynamic screw dividing plate that the viscous melt on the inwall of dynamic mixture pipeline is rotated scrapes, and the viscous melt scraped is with moving
It is diluter that melt mixes among state batch mixing pipeline, and push ahead to the 3rd semicircle spiral in static batch mixing pipeline and lead to
Mixed in road and the 4th semicircle helical duct, entered back into after mixing and above-mentioned mixing process is repeated in dynamic mixture pipeline,
After some groups of batch mixing units, the first spinning pump for entering in spinning manifold；
Larger molecular weight polylactic acid raw material uses polylactic acid slice indirect spinning technique in the present invention, due to drying temperature with
For the molecular weight of polylactic acid slice into positive correlation, molecular weight is higher, then can have higher drying temperature, thus improves dry
Dry efficiency and effect.First polylactic acid slice is dried, in dried polylactic acid slice storage to feed bin, and passes through metering
The metering of device is entered in spinning screw extruder；
Second melt pipe is provided with the second sound integrated pipeline formula mixing device, has the advantages that：In spinning
In the presence of screw extruder, polylactic acid melt is entered by the second melt pipe, when sticky melt passes through dynamic under high pressure
When batch mixing pipeline, dynamic screw dividing plate starts to rotate under the promotion of melt, sticky on the inwall of dynamic mixture pipeline
The dynamic screw dividing plate that melt is rotated scrapes, diluter that melt is mixed among the viscous melt and dynamic mixture pipeline scraped
Together, and push ahead into the 3rd semicircle helical duct and the 4th semicircle helical duct in static batch mixing pipeline and mixed
Close, entered back into after mixing and above-mentioned mixing process is repeated in dynamic mixture pipeline, after some groups of batch mixing units, enter spinning
The second spinning pump in silk casing；
The polylactic acid melt supercharging of lower molecular weight is sent to double spray orifice parallel type filament spinning components by the first spinning pump,
The polylactic acid melt supercharging of higher molecular weight is sent to double spray orifice parallel type filament spinning components by the second spinning pump simultaneously, relatively low
The polylactic acid melt of molecular weight and the polylactic acid melt of higher molecular weight are well mixed in double spray orifice parallel type filament spinning components, most
Sprayed afterwards by the spinneret of double spray orifice parallel type filament spinning components, produce PLA Composite Fiber（The horizontal stroke of single composite fibre
Section half is the polylactic acid melt of lower molecular weight, and second half is the polylactic acid melt of higher molecular weight）.
First sound integrated pipeline formula mixing device and the second sound integrated pipeline formula mixing device are due to the first semicircle spiral shell
Revolve passage and the second semicircle helical duct it is longer and in the axial direction for the hand of spiral set, thus can be in pressurized melt
By when, driving dynamic screw dividing plate rotation；The top form coordinated with cone tank top pressure of rotary material of dynamic screw dividing plate,
It is not only easy to manufacture and assembles, and frictional force is smaller in rotary course, so as to improve the efficiency of dynamic screw dividing plate scraper.
The length of static batch mixing pipeline is less than the length of dynamic mixture pipeline, can so make the major part of the pipeline of whole conveying PLA
Length can all wipe the king-sized PLA of the viscosity adhered on tube wall off, fully improve the uniformity of mixing.
In summary, principle of the invention science, reasonable in design, simple in construction, it is ensured that the melt in prepolymerization pipe is constant
Flowed downward under speed state, and make the tube wall of each aspect and prepolymerization tube hub when melt flows downward in prepolymerization pipe
Solution temperature is also basically identical, so as to meet the requirement of polymerization technique.Some groups of batch mixings are directly set on the first melt pipe
Unit, eliminate and mixing system be installed on conveyance conduit, saved cost, reach the purpose of uniform batch mixing, conveying and
Batch mixing efficiency greatly improves.The present invention will be melted, filtered after poly-lactic acid in high molecular weight chip drying, mix after and be transported to
Double spray orifice parallel type filament spinning components carry out spinning, while will be transported to after low molecular weight polymerizable raw material, filtering, mixing double
In spray orifice parallel type filament spinning component, this pair of spray orifice parallel type filament spinning component is the hair that number of patent application is CN201510042184.2
Bright disclosed technical scheme.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the structural representation of the invention for having in Fig. 1 one group of batch mixing unit；
Fig. 3 is the dimensional structure diagram of dynamic screw dividing plate in Fig. 2；
Fig. 4 is the dimensional structure diagram of static ribbon dividing plate in Fig. 2；
Fig. 5 is the structural representation of PLA pre-polymerization mixing device in Fig. 1；
Fig. 6 is the top view of the central melt flow dividing structure in Fig. 5.
Embodiment
As shown in figs 1 to 6, PLA bi-component composite fiber spinning production equipment of the invention, including aggregation framework
16th, drying tower 18, feed bin 30, spinning screw extruder 32 and spinning manifold 17, it is sequentially provided with from top to bottom in aggregation framework 16
Agitator tank 19, first poly- tank 20 and whole poly- tank 21, the bottom of agitator tank 19 are connected by the first conveying pipeline 22 with the just poly- top of tank 20, the
One conveying pipeline 22 is provided with PLA pre-polymerization mixing device 40, the first autocontrol valve 23 and the first measuring pump 24, first poly- tank 20
Bottom be connected by the second conveying pipeline 25 with the top of poly- tank 21 eventually, and the second conveying pipeline 25 is provided with the second autocontrol valve 26 and the
Two measuring pumps 27.
The first spinning pump 33, the second spinning pump 34 and double spray orifice parallel type spinning groups are provided with spinning manifold 17
The discharging opening of part 35, the first spinning pump 33 and the second spinning pump 34 respectively with double spray orifice parallel type filament spinning components 35
Charging aperture connects；
The poly- bottom of tank 21 is connected by the first melt pipe 28 with the charging aperture of the first spinning pump 33 eventually；
The outlet of drying tower 18 is connected with the import of feed bin 30, and the outlet of feed bin 30 is squeezed by tremie pipe 36 with spinning screw
Go out the import connection of machine 32, tremie pipe 36 is provided with meter 37, and the discharging opening of spinning screw extruder 32 passes through the second melt
Pipeline 38 is connected with the charging aperture of the second spinning pump 34；
On first melt pipe 28 first filter 39, the 3rd measuring pump 29 and first are sequentially provided with along melt flows direction
Sound integrated pipeline formula mixing device 31, the He of the second filter 60 is sequentially provided with along melt flows direction on the second melt pipe 38
Second sound integrated pipeline formula mixing device 61, the first sound integrated pipeline formula mixing device 31 and the second sound integrated pipeline formula
The construction of mixing device 61 is identical.
First sound integrated pipeline formula mixing device 31 includes fixed -piping 1 and batch mixing unit, and batch mixing unit includes coaxial
To static the batch mixing pipeline 2 and dynamic mixture pipeline 3 of setting, the right-hand member of the left end of dynamic mixture pipeline 3 and static batch mixing pipeline 2
Flange connects, and is provided with dynamic screw dividing plate 4 in dynamic mixture pipeline 3, and dynamic screw dividing plate 4 is by the inside edge of dynamic mixture pipeline 3
Axial direction is separated into the first semicircle helical duct 5 and the second semicircle helical duct 6, dynamic screw dividing plate 4 and dynamic mixture pipe
The inwall gap of road 3 coordinates；It is provided with static ribbon dividing plate 7 in static batch mixing pipeline 2, static ribbon dividing plate 7 is by static batch mixing pipeline 2
Axially inside direction is separated into the 3rd semicircle helical duct 8 and the 4th semicircle helical duct 9, static ribbon dividing plate 7 and static state
The inwall of batch mixing pipeline 2 is fixedly connected.
Plane where the both ends of dynamic screw dividing plate 4 and static ribbon dividing plate 7 is each perpendicular to dynamic mixture pipeline 3
Central axis, the right part center of dynamic screw dividing plate 4 are provided with dynamic cone tank 10, and the left part center of dynamic screw dividing plate 4 is provided with
Dynamically top 11, the right part center of static ribbon dividing plate 7 is provided with static cone tank 12, and the left part center of static ribbon dividing plate 7 is set
There is static state top 13, top 11 left end of dynamic is withstood in static cone tank 12.
The left end of fixed -piping 1 is connected with the right-hand member flange of dynamic mixture pipeline 3, and support 14, support 14 are provided with fixed -piping 1
Stationary center 15 is provided with, the left end of stationary center 15 is withstood in dynamic cone tank 10.
The quantity of batch mixing unit is more than or equal to two groups, and flange connects between two adjacent groups batch mixing unit, one group of batch mixing unit
Static top 13 left end withstand in the dynamic cone tank 10 of one group of adjacent batch mixing unit, the one of fixed -piping 1 and low order end
The unit connection of group batch mixing.The length of static batch mixing pipeline 2 is less than the length of dynamic mixture pipeline 3.
PLA pre-polymerization mixing device 40 includes the prepolymerization pipe 41 being arranged in vertical, and the both ends of prepolymerization pipe 41 are fixed
Be connected on the first conveying pipeline 22, or can using the first conveying pipeline 22 as prepolymerization pipe 41, in prepolymerization pipe 41 from upper and
Under it is identical at least provided with two batch mixing preheaters, all equal structures of batch mixing preheater；Prepolymerization pipe 41 can make in the present invention
Replaced with the first conveying pipeline 22；
Each batch mixing preheater includes having the first upper conical guide shell 42, second of same center line is upper conical to lead
Flow cartridge 43, the first inferior pyramidal guide shell 44, the second inferior pyramidal guide shell 45, upper shunting cone cylinder 46 and lower shunting cone cylinder 47；
The first upper conical inferior pyramidal guide shell 44 of guide shell 42 and first is upper coarse and lower fine and upper and lower permeable structures, and first
The upper conical bottom diameter of guide shell 42 is more than the second upper conical bottom diameter of guide shell 43, the second upper conical guide shell 43 and second
Inferior pyramidal guide shell 45 is up-thin-low-thick and upper and lower permeable structures, the first upper conical bottom diameter of guide shell 42 and the second epicone
The upper-end inner diameter of shape guide shell 43 is equal, the bottom diameter of the first inferior pyramidal guide shell 44 and the upper-end inner diameter of the second inferior pyramidal guide shell 45
It is equal, the first upper conical upper end outer of guide shell 42, the second upper conical lower end outer of guide shell 43, the first inferior pyramidal guide shell 44
Upper end edge and the lower end edge of the second inferior pyramidal guide shell 45 are fixedly connected with the inwall of prepolymerization pipe 41, the first upper conical water conservancy diversion
Cylinder 42 lower end edges be fixedly connected with the second upper conical upper end edge of guide shell 43, the first upper conical lower end edge of guide shell 42 and
The second upper conical upper end edge of guide shell 43 is fixedly connected, the lower end edge of the first inferior pyramidal guide shell 44 and the second inferior pyramidal water conservancy diversion
45 upper end edges of cylinder are fixedly connected；
Upper shunting cone cylinder 46 is the structure that top sharply blocks, bottom is open, lower shunting cone cylinder 47 be bottom sharply block,
The structure of open top, upper shunting cone cylinder 46 bottom diameter are equal to the lower shunting upper-end inner diameter of cone cylinder 47, upper shunting cone cylinder 46 lower end
Internal diameter is less than the internal diameter of prepolymerization pipe 41, and the upper shunting lower end edge of cone cylinder 46 is fixedly connected with lower shunting cone cylinder 47 upper end edge；On
Shunting cone cylinder 46 and the lower shunting outer wall of cone cylinder 47 are fixedly connected by heating agent conduit with the inwall of prepolymerization pipe 41；
The upper end of upper shunting cone cylinder 46 be higher than the first upper conical upper end edge of guide shell 42, the lower end of lower shunting cone cylinder 47 and
The upper end edge of second inferior pyramidal guide shell 45 flushes；
Circulation road under tube wall melt is formed between upper the shunting outer surface of cone cylinder 46 and the outer surface of the first inferior pyramidal guide shell 44
48, form circulation road 49 under blend melt between lower the shunting outer surface of cone cylinder 47 and the outer surface of the first inferior pyramidal guide shell 44；
Upper shunting cone cylinder 46 outer surface is provided with central melt flow dividing structure 50, the lower end of central melt flow dividing structure 50 and pipe
The lower end of circulation road 48 crosses under wall melt.
Central melt flow dividing structure 50 includes a shunt cylinder 51 and several isocons 52, shunt cylinder 51 and isocon 52
It is each provided in shunting cone cylinder 46, the open top of shunt cylinder 51, the upper end edge of shunt cylinder 51 is horizontal, and isocon 52 is wide at the top and narrow at the bottom,
All isocons 52 of isocon 52 are evenly arranged along the upper shunting circumferencial direction of cone cylinder 46, the upper end of isocon 52 and the lower end of shunt cylinder 51
Connection, the lower port of isocon 52 are located at the lower end of circulation road 48 and the upper end intersection of circulation road 49 under blend melt under tube wall melt
Outside.
Upper shunting cone cylinder 46 is internally formed preheating cavity 53 with lower shunting cone cylinder 47, the first inferior pyramidal guide shell 44 and the
Thermal cycle stream has been passed through in preheating cavity 54 under being internally formed of two inferior pyramidal guide shells 45, upper preheating cavity 53 and lower preheating cavity 54
Body medium.Heating agent conduit is inner to be connected with upper preheating cavity 53, and heating agent external catheter end is stretched out outside prepolymerization pipe.Heating agent conduit is to upper
Hot circulating fluid medium in preheating cavity 53 carries out circulation water conservancy diversion, and plays and shunt cone cylinder 46 and lower shunting cone cylinder in support positioning
47 effect.Wherein heating agent conduit does not illustrate in figure comes.
The progress batch mixing warm of setting PLA pre-polymerization mixing device 40 is on the first conveying pipeline：Melt is in prepolymerization
Flowed downward in pipe 41, the melt A at the center of prepolymerization pipe 41 enters shunt cylinder 51, melt A along upper shunting cone cylinder 46 surface
Flow to the intersection of the lower end of circulation road 48 and the upper end of circulation road 49 under blend melt under tube wall melt automatically by isocon 52 again
Outside, at the same time, the melt B close to the tube wall of prepolymerization pipe 41 enters tube wall melt by the first upper conical guide shell 42
In lower circulation road 48, flow under tube wall melt and be located at melt A top behind the lower end of circulation road 48, be i.e. melt A and melt B enter mixed
Close under melt after circulation road 49, melt A is located at lower floor, and melt B is located at upper strata, when melt A and melt B are flowed under blend melt
When the lower end of circulation road 49 exports, melt B is located among melt A, i.e. melt A is transformed into from center to be continued to dirty along tube wall
Dynamic, melt B continues to flow downward by being transformed into center close to tube wall, and during transposition, melt A and melt B have also carried out one
Surely mix.The flow direction for being oriented to melt A of hollow arrow in Fig. 5, the flow direction for being oriented to melt B of filled arrows.
During melt mixed transposition, hot circulating fluid medium is passed through in upper preheating cavity 53 and lower preheating cavity 54,
Hot circulating fluid medium can add thermal medium such as according to technological requirement；Biphenyl Ether, conduction oil etc., are preheated to melt,
To facilitate control prepolymerization process.The present invention takes no dead angle design in the junction of all parts.A piece prepolymerization pipe 41
Multigroup batch mixing preheater can be inside installed from top to bottom.
Relatively small molecular weight polylactic acid raw material is eliminated to compared with small molecule using the technique of direct fabrics after polymerization in the present invention
The defects of rear indirect spinning is dried in amount polylactic acid slice.The first sound integrated pipeline formula is set to mix on first melt pipe 28
Expect device 31, have the advantages that：In the presence of the 3rd measuring pump 29, the PLA after polymerization is entered by fixed -piping 1
Enter, when sticky melt under high pressure by dynamic mixture pipeline 3 when, dynamic screw dividing plate 4 is opened under the promotion of melt
Begin to rotate, the dynamic screw dividing plate 4 that the viscous melt on the inwall of dynamic mixture pipeline 3 is rotated scrapes, and what is scraped is sticky molten
It is diluter that melt mixes among body and dynamic mixture pipeline 3, and push ahead to the 3rd half in static batch mixing pipeline 2
Mixed in the circle semicircle helical duct 9 of helical duct 8 and the 4th, enter back into dynamic mixture pipeline 3 and repeat after mixing
Mixing process is stated, after some groups of batch mixing units, the first spinning pump 33 for entering in spinning manifold 17；
Larger molecular weight polylactic acid raw material uses polylactic acid slice indirect spinning technique in the present invention, due to drying temperature with
For the molecular weight of polylactic acid slice into positive correlation, molecular weight is higher, then can have higher drying temperature, thus improves dry
Dry efficiency and effect.First polylactic acid slice is dried, in dried polylactic acid slice storage to feed bin 30, and passes through meter
The metering of measuring device 37 is entered in spinning screw extruder 32；
Second melt pipe 38 is provided with the second sound integrated pipeline formula mixing device 61, has the advantages that：
In the presence of spinning screw extruder 32, the polylactic acid melt of higher molecular weight is entered by the second melt pipe 38, when sticky
Melt under high pressure by dynamic mixture pipeline 3 when, dynamic screw dividing plate 4 starts to rotate under the promotion of melt, dynamic
The dynamic screw dividing plate 4 that viscous melt on the inwall of batch mixing pipeline 3 is rotated scrapes, the viscous melt and dynamic mixture scraped
It is diluter that melt mixes among pipeline 3, and push ahead to the 3rd semicircle helical duct 8 in static batch mixing pipeline 2
Mixed with the 4th semicircle helical duct 9, entered back into after mixing and above-mentioned mixing process is repeated in dynamic mixture pipeline 3,
After some groups of batch mixing units, the second spinning pump 34 for entering in spinning manifold 17；
The polylactic acid melt supercharging of lower molecular weight is sent to double spray orifice parallel type spinning groups by the first spinning pump 33
Part 35, while the polylactic acid melt supercharging of higher molecular weight is sent to double spray orifice parallel type spinning groups by the second spinning pump 34
Part 35, the polylactic acid melt of lower molecular weight and the polylactic acid melt of higher molecular weight are in double spray orifice parallel type filament spinning components 35
It is well mixed, sprayed finally by the spinneret of double spray orifice parallel type filament spinning components 35, produce PLA Composite Fiber（It is single
The cross section half of composite fibre is the polylactic acid melt of lower molecular weight, and second half is the polylactic acid melt of higher molecular weight）.
Because the first semicircle helical duct 5 and the second semicircle spiral logical 6 is longer and is spiral side in the axial direction
To setting, thus can pressurized melt by when, driving dynamic screw dividing plate 4 rotates；The rotary material of dynamic screw dividing plate 4
The top form coordinated with cone tank top pressure, is not only easy to manufacture and assembles, and frictional force is smaller in rotary course, so as to
Improve the efficiency of the scraper of dynamic screw dividing plate 4.The length of static batch mixing pipeline 2 is less than the length of dynamic mixture pipeline 3, so may be used
Make whole first melt pipe 28（It is made up of static batch mixing pipeline 2 and dynamic mixture pipeline 3）Most of length all can be by pipe
The king-sized PLA of viscosity adhered on wall is wiped off, fully improves the uniformity of mixing.
Comprised the following steps that used by the spinning production technology of the present invention：
（1）, by participate in polymerization catalyst, stabilizer equal solvent fusion turn into suspension, suspension is injected into stirring
In tank 19, at the same into agitator tank 19 inject lower molecular weight lactide melt, open agitator tank work, stirring melt 20~
40min, stop stirring after well mixed；Meanwhile the polylactic acid slice of higher molecular weight is sent in drying tower 18
Row drying, dried polylactic acid slice are stored into feed bin 30；
（2）, open the first autocontrol valve 23 of agitator tank 19 bottom, lactide melt is mixed by the first measuring pump 24
Compound drops into through the first conveying pipeline 22 just carries out preliminary polymerization operation in poly- tank 20, preliminary polymerization operation be temperature be 100~
150 DEG C, the time of preliminary polymerization operation is 1~2h, pressure 0.2MPa, after preliminary polymerization operation, lactide, titanium dioxide and
The mixture of solvent is aggregated into as sticky polylactic acid melt；Meanwhile the polylactic acid slice in feed bin 30 passes through tremie pipe 36
First measured, dropped into after metering in spinning screw extruder 32；
（3）, open the second autocontrol valve 26 of the just poly- bottom of tank 20, by the second measuring pump 27 by the poly- breast of low molecule amount
Sour melt drops into the final polymerization operation of the interior progress of poly- tank 21 eventually through the second conveying pipeline 25, and final polymerization operation is that temperature is 150
~280 DEG C, the final time for polymerizeing operation is 1~6h, pressure 0.3MPa；Spinning screw extruder 32 is by PLA dry chip
It is heated to 200-300 DEG C and poly-lactic acid in high molecular weight melt is made；
（4）, open the 3rd autocontrol valve of the poly- bottom of tank 21 eventually, the low molecular weight pdlla melt in poly- tank 21 is through the eventually
One melt pipe 28 is discharged, the 3rd measuring pump 29 on the first melt pipe 28 for low molecular weight pdlla melt provide metering and it is defeated
The power sent, and by the filtering of first filter 39, the first sound integrated pipeline formula mixing device 31 is to low molecular weight pdlla
Melt is mixed, and then low molecular weight pdlla melt is entered in the first spinning pump 33 in spinning manifold 17；Meanwhile
In the presence of spinning screw extruder 32, macromolecule polylactic acid melt is entered by the second melt pipe 38, through the second filter
60 filtering, the second sound integrated pipeline formula mixing device 61 enter manifold after being mixed to macromolecule polylactic acid melt
In the second spinning pump 34 in body 17；
（5）, the supercharging of the polylactic acid melt of lower molecular weight is sent to double spray orifice parallel types and spun by the first spinning pump 33
Silk component 35, while the polylactic acid melt supercharging of higher molecular weight is sent to double spray orifice parallel types and spun by the second spinning pump 34
Silk component 35, the polylactic acid melt of lower molecular weight and the polylactic acid melt of higher molecular weight are in double spray orifice parallel type filament spinning components
It is well mixed in 35, is sprayed finally by the spinneret of double spray orifice parallel type filament spinning components 35, produce PLA Composite Fiber.
The present embodiment is not that the shape to the present invention, material, structure etc. make any formal limitation, every according to this hair
Any simple modification, equivalent change and modification that bright technical spirit is made to above example, belongs to the technology of the present invention side
The protection domain of case.
Claims (6)
1. PLA bi-component composite fiber spinning production equipment, it is characterised in that：Including aggregation framework, drying tower, feed bin, spinning
Silk screw extruder and spinning manifold, agitator tank, first poly- tank and poly- tank eventually, agitator tank are sequentially provided with aggregation framework from top to bottom
Bottom is connected by the first conveying pipeline with first poly- tank top, and the first conveying pipeline is provided with PLA pre-polymerization mixing device, first certainly
Dynamic control valve and the first measuring pump, first poly- pot bottom are connected with poly- tank top eventually by the second conveying pipeline, set on the second conveying pipeline
There are the second autocontrol valve and the second measuring pump；
The first spinning pump, the second spinning pump and double spray orifice parallel type filament spinning components are provided with spinning manifold, first spins
Charging aperture of the discharging opening of thread metering pump and the second spinning pump respectively with double spray orifice parallel type filament spinning components is connected；
Poly- pot bottom is connected by the first melt pipe with the charging aperture of the first spinning pump eventually；
The outlet of drying tower and the import of feed bin are connected, and the outlet of feed bin is connected by the import of tremie pipe and spinning screw extruder
Connect, tremie pipe is provided with meter, and the discharging opening of spinning screw extruder passes through the second melt pipe and the second spinning pump
Charging aperture connection；
On first melt pipe first filter, the 3rd measuring pump and the first sound integral tube are sequentially provided with along melt flows direction
Road formula mixing device, the second filter and the second sound integrated pipeline are sequentially provided with along melt flows direction on the second melt pipe
The construction of formula mixing device, the first sound integrated pipeline formula mixing device and the second sound integrated pipeline formula mixing device is identical；
PLA pre-polymerization mixing device includes the prepolymerization pipe that is arranged in vertical, in prepolymerization pipe from top to bottom at least provided with
Two batch mixing preheaters, all equal structures of batch mixing preheater are identical；
Each batch mixing preheater include the first upper conical guide shell with same center line, the second upper conical guide shell,
First inferior pyramidal guide shell, the second inferior pyramidal guide shell, upper shunting cone cylinder and lower shunting cone cylinder；
First upper conical guide shell and the first inferior pyramidal guide shell are upper coarse and lower fine and upper and lower permeable structures, and first upper conical leads
Flow cartridge bottom diameter is more than the second upper conical guide shell bottom diameter, and the second upper conical guide shell and the second inferior pyramidal guide shell are equal
For up-thin-low-thick and upper and lower permeable structures, the first upper conical guide shell bottom diameter and the second upper conical guide shell upper-end inner diameter phase
Deng the first inferior pyramidal guide shell bottom diameter is equal with the second inferior pyramidal guide shell upper-end inner diameter, on the first upper conical guide shell
Hold under outer, the second upper conical guide shell lower end outer, the first inferior pyramidal guide shell upper end edge and the second inferior pyramidal guide shell
End edge edge is fixedly connected with prepolymerization inside pipe wall, the first upper conical guide shell lower end edge and the second upper conical guide shell upper end
Edge is fixedly connected, and the first upper conical guide shell lower end edge is fixedly connected with the second upper conical guide shell upper end edge, and first
Inferior pyramidal guide shell lower end edge is fixedly connected with the second inferior pyramidal guide shell upper end edge；
Upper shunting cone cylinder is the structure that top sharply blocks, bottom is open, and lower shunting cone cylinder sharply blocks for bottom, open top
Structure, upper shunting cone cylinder bottom diameter is equal to lower shunting cone cylinder upper-end inner diameter, and upper shunting cone cylinder bottom diameter is less than prepolymerization
Bore, upper shunting cone cylinder lower end edge are fixedly connected with lower shunting cone cylinder upper end edge；Upper shunting cone cylinder and lower shunting cone cylinder
Outer wall is fixedly connected by heating agent conduit with prepolymerization inside pipe wall；
The upper end of upper shunting cone cylinder is higher than the first upper conical guide shell upper end edge, the lower end of lower shunting cone cylinder and the second inferior pyramidal
Guide shell upper end edge flushes；
Circulation road under tube wall melt, lower spreader are formed between upper spreader tube outer surface and the first inferior pyramidal water conservancy diversion tube outer surface
Circulation road under blend melt is formed between tube outer surface and the first inferior pyramidal water conservancy diversion tube outer surface；
Upper spreader tube outer surface is provided with central melt flow dividing structure, and lower end and the tube wall melt of central melt flow dividing structure flow down
Passage lower end crosses.
2. PLA bi-component composite fiber spinning production equipment according to claim 1, it is characterised in that：First sound
Integrated pipeline formula mixing device includes fixed -piping and batch mixing unit, and batch mixing unit includes the static batch mixing pipeline of coaxial setting
With dynamic mixture pipeline, the left end of dynamic mixture pipeline is connected with the right-hand member flange of static batch mixing pipeline, in dynamic mixture pipeline
Provided with dynamic screw dividing plate, by dynamic mixture pipeline, axially inside direction is separated into the first semicircle spiral and led to dynamic screw dividing plate
Road and the second semicircle helical duct, dynamic screw dividing plate coordinate with dynamic mixture inner-walls of duct gap；Set in static batch mixing pipeline
There is static ribbon dividing plate, axially inside direction is separated into the 3rd semicircle helical duct to static ribbon dividing plate by static batch mixing pipeline
With the 4th semicircle helical duct, static ribbon dividing plate is fixedly connected with static batch mixing inner-walls of duct；
Plane where the both ends of dynamic screw dividing plate and static ribbon dividing plate is each perpendicular to the central shaft of dynamic mixture pipeline
Line, dynamic screw dividing plate right part center are provided with dynamic cone tank, and dynamic screw dividing plate left part center is top provided with dynamic, quiet
State helical baffle right part center is provided with static cone tank, and static ribbon dividing plate left part center is provided with static top, dynamic top
Sharp left end is withstood in static cone tank；
Fixed -piping left end is connected with dynamic mixture pipeline right-hand member flange, and support is provided with fixed -piping, and support, which is provided with, to be fixed
Top, stationary center left end is withstood in dynamic cone tank.
3. PLA bi-component composite fiber spinning production equipment according to claim 2, it is characterised in that：Batch mixing unit
Quantity be more than or equal to two groups, flange connects between two adjacent groups batch mixing unit, the static top left end top of one group of batch mixing unit
In the dynamic cone tank of one group of adjacent batch mixing unit, one group of batch mixing unit connection of fixed -piping and low order end.
4. the PLA bi-component composite fiber spinning production equipment according to Claims 2 or 3, it is characterised in that：It is static
The length of batch mixing pipeline is less than the length of dynamic mixture pipeline.
5. PLA bi-component composite fiber spinning production equipment according to claim 1, it is characterised in that：Central melt
Flow dividing structure includes a shunt cylinder and several isocons, and shunt cylinder and isocon are each provided in shunting cone cylinder, shunt cylinder
Open top, shunt cylinder upper end edge is horizontal, and isocon is wide at the top and narrow at the bottom, and all isocons of isocon shunt cone cylinder circumference side along upper
To being evenly arranged, isocon upper end connects with shunt cylinder lower end, shunting infratubal port be located under tube wall melt circulation road lower end and
The outside of circulation road upper end intersection under blend melt.
6. PLA bi-component composite fiber spinning production equipment according to claim 5, it is characterised in that：Upper spreader
Cylinder is internally formed upper preheating cavity with lower shunting cone cylinder, and the first inferior pyramidal guide shell is internally formed with the second inferior pyramidal guide shell
Hot circulating fluid medium has been passed through in lower preheating cavity, upper preheating cavity and lower preheating cavity；Heating agent conduit is inner to be connected with upper preheating cavity
Logical, heating agent external catheter end is stretched out outside prepolymerization pipe.
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| CN113279085B (en) * | 2021-03-17 | 2023-02-24 | 中国纺织科学研究院有限公司 | Stock solution coloring fully-stereo composite polylactic acid fiber, preparation method, crystallization behavior testing method, device, storage medium and equipment |
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