CN104195658A - UHMWPP and UHMWPE sheath-core composite fiber, special device and spinning method thereof - Google Patents
UHMWPP and UHMWPE sheath-core composite fiber, special device and spinning method thereof Download PDFInfo
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Abstract
The invention relates to a sheath-core composite fiber, in particular to a UHMWPP and UHMWPE sheath-core composite fiber, a special device and a spinning method of the UHMWPP and UHMWPE sheath-core composite fiber. A UHMWPE layer is sleeved with UHMWPP layer, an upper cover is arranged on the upper portion of a shell and fixedly connected with the shell, a component inner cavity is formed in the shell, a UHMWPE spinning solution material inlet is formed in the left end of the upper cover and communicated with the component inner cavity, and a UHMWPP spinning solution material inlet is formed in the right end of the upper cover and communicated with the component inner cavity, a spinneret plate component is arranged at the bottom of the component inner cavity, and a distribution plate component is arranged on the spinneret plate component. The spinning method comprises the following steps of preparation of sheath-core gel-spinning fibers, gel-spinning fiber balancing, batched type bundling, pre-drafting, extraction, drying, multilevel heating draft and finished product winding and detection. The UHMWPP and UHMWPE sheath-core composite fiber, the special device and the spinning method of the UHMWPP and UHMWPE sheath-core composite fiber have the advantages that high temperature resistance is achieved, creep resistance is excellent, and section adhesive property is good.
Description
Technical field
The present invention relates to a kind of core-skin composite fiber, relate in particular to a kind of UHMWPP and UHMWPE core-skin composite fiber, special equipment and spinning process thereof.
Background technology
Superhigh molecular weight polyethylene fibers temperature tolerance is low, and while use under higher temperature, the mechanical performance indexs such as intensity, modulus significantly reduce, the fibre lost of life.Due to superhigh molecular weight polyethylene fibers interior molecules, mechanism presents extended-chain configuration, and the creep of this fiber under certain temperature and external force obviously increased.When the interior molecules structure of high-sequential and non-polar nature cause this fiber to use as composite raw fiber, not good with the interface adhesion of resin matrix.For example, the shock resistance of the anti-spring-go material of superhigh molecular weight polyethylene fibers is inadequate, and therefore, the above-mentioned defect of superhigh molecular weight polyethylene fibers, causes the product such as bullet resistant material, hawser to have certain defect.
Composite fibre refers to by two or more polymer, or has the chemical fibre that same polymer of different nature adopts the method for composite spinning to make, and contains two or more immiscible component on the cross section of fiber.Divide according to structure, common composite fibre has parallel type, core-skin type, fabric of island-in-sea type, sliver type etc.
Superhigh molecular weight polyethylene fibers generally refers to the polyethylene filament of relative molecular mass more than 1,000,000.This fiber degree of orientation is high, degree of crystallinity is high, modulus is high, density is low, there is the performances such as good UV resistant radiation, wear-resistant, resistance to chemical attack, impact resistance, be the ideal material of making rope, matter bulletproof jacket, lightweight bulletproof helmet, ballistic composite, also have broad application prospects in fields such as medicine equipment, sports movement apparatus, space flight and aviation structural materials.
Although ultra-high molecular weight polyethylene has the performance of above-mentioned excellence, the defect of its molecular structure and non-polar nature, cause this fiber that large intermolecular slippage easily occurs under effect of stress, produces creep; Temperature tolerance is poor, under 120 DEG C of environment, uses after 4 hours, and its strength and modulus is only 50% of initial strength and modulus; In addition, nonpolarity group on strand, smooth surface, causes interfacial bond property poor.Above-mentioned defect, has limited the application in the shellproof field of superhigh molecular weight polyethylene fibers, maritime affairs hawser field etc.
At present, the conventional technical scheme of improving ultra-high molecular weight polyethylene performance is: in the spinning solution of ultra-high molecular weight polyethylene, add nanoparticle.For example: preparation method and the application thereof of the article ultra-high molecular weight polyethylene/graphite alkene composite fibre that Chinese Patent Application No. is 201210078324.8, related is in ultra-high molecular weight polyethylene spinning solution, to add a small amount of nano level Graphene, is used for improving the TENSILE STRENGTH of superhigh molecular weight polyethylene fibers and the interface adhesion of resin matrix.
In prior art, add nanoparticle and can improve fibrous mechanical property, but nanoparticle additive has reduced the mobility of spinning solution in ultra-high molecular weight polyethylene spinning solution, spinning difficulty increases; Easily there is agglomeration in nanoparticle, stops up spinneret orifice; Secondly, nanoparticle increases the weakness in fibril aggregation state structure at fibrous inside, very easily forms breakaway poing under external force at particulate place.Above-mentionedly limit the application of nanoparticle in superhigh molecular weight polyethylene fibers spinning.
Summary of the invention
The present invention solves the deficiencies in the prior art, it is cortex that a kind of ultrahigh molecular weight polypropylene is provided, form an inner chamber, ultra-high molecular weight polyethylene is wrapped in to inside, obtain a kind of taking ultrahigh molecular weight polypropylene as skin, superhigh molecular weight polyethylene fibers is the core-skin composite fiber of core, because ultrahigh molecular weight polypropylene and ultra-high molecular weight polyethylene have identical construction unit, intermolecular compatible higher, utilize the mechanical property of ultrahigh molecular weight polypropylene to avoid the creep of superhigh molecular weight polyethylene fibers, resin matrix bad adhesion, UHMWPP and the UHMWPE core-skin composite fiber of the defects such as temperature tolerance is poor, special equipment and spinning process thereof.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals:
The core-skin composite fiber of a kind of UHMWPP and UHMWPE, comprise ultrahigh molecular weight polypropylene layer and ultra-high molecular weight polyethylene layer, described ultra-high molecular weight polyethylene layer overcoat has ultrahigh molecular weight polypropylene layer, ultrahigh molecular weight polypropylene layer is cortex, ultra-high molecular weight polyethylene layer is sandwich layer, the molecular weight of ultra-high molecular weight polyethylene layer is 5 × 106～6 × 106g/mol, and the molecular weight of ultrahigh molecular weight polypropylene layer is 5 × 105～6 × 105g/mol.
The special equipment of core-skin composite fiber, comprise housing, the top of described housing is provided with the upper cover body fixing with housing, in described housing, be provided with assembly inner chamber, in the left end of described upper cover body, be provided with the ultra-high molecular weight polyethylene spinning solution material inlet with assembly intracavity inter-connection, in the right-hand member of described upper cover body, be provided with the ultrahigh molecular weight polypropylene spinning solution material inlet with assembly intracavity inter-connection, the bottom of described assembly inner chamber is provided with spinneret component, the top of described spinneret component is provided with distribution plate assembly, described distribution plate assembly comprises distribution plate, middle distribution plate and lower distribution plate, described upper distribution plate, middle distribution plate and lower distribution plate distribute from top to bottom successively, between described upper distribution plate and middle distribution plate, be provided with screen pack, in described upper distribution plate, be provided with ultrahigh molecular weight polypropylene spinning solution flow-guiding mouth and ultra-high molecular weight polyethylene spinning solution flow-guiding mouth, described ultrahigh molecular weight polypropylene spinning solution flow-guiding mouth is connected with ultrahigh molecular weight polypropylene spinning solution material inlet, described ultra-high molecular weight polyethylene spinning solution flow-guiding mouth is connected with ultra-high molecular weight polyethylene spinning solution material inlet, in described lower distribution plate, be provided with ultrahigh molecular weight polypropylene spinning solution liquid outlet and ultra-high molecular weight polyethylene spinning solution liquid outlet, described ultrahigh molecular weight polypropylene spinning solution flow-guiding mouth is connected with ultrahigh molecular weight polypropylene spinning solution liquid outlet by middle distribution plate, described ultra-high molecular weight polyethylene spinning solution flow-guiding mouth is connected with ultra-high molecular weight polyethylene spinning solution liquid outlet by middle distribution plate, described spinneret component comprises the upper distribution plate of spray silk, distribution plate and spray silk lower distribution plate in spray silk, distribution plate on described spray silk, in spray silk, distribution plate and spray silk lower distribution plate distribute from top to bottom successively, on described spray silk, in distribution plate, be provided with the spinnerets ultrahigh molecular weight polypropylene spinning solution flow-guiding mouth being connected with ultrahigh molecular weight polypropylene spinning solution liquid outlet, on described spray silk, in distribution plate, be provided with the spinnerets ultra-high molecular weight polyethylene spinning solution flow-guiding mouth being connected with ultra-high molecular weight polyethylene spinning solution liquid outlet, in described spray silk lower distribution plate, be provided with spinnerets guiding gutter, spinnerets ring dress baffle liner, spinnerets ultra-high molecular weight polyethylene guide hole, spinneret orifice and spinnerets baffle liner, described spinnerets guiding gutter is connected with spinnerets ultrahigh molecular weight polypropylene spinning solution flow-guiding mouth, described spinnerets guiding gutter is connected with spinnerets ring dress baffle liner, described spinnerets ring dress baffle liner is connected with spinneret orifice, described spinnerets baffle liner is connected with spinnerets ultra-high molecular weight polyethylene spinning solution flow-guiding mouth, described spinnerets baffle liner is connected with spinnerets ultra-high molecular weight polyethylene guide hole, the bottom of described spinnerets ultra-high molecular weight polyethylene guide hole extends in spinneret orifice, described spinnerets guiding gutter is connected with spinnerets ultrahigh molecular weight polypropylene spinning solution flow-guiding mouth by distribution plate in spray silk, described spinnerets baffle liner is connected with spinnerets ultra-high molecular weight polyethylene spinning solution flow-guiding mouth by distribution plate in spray silk, on described spray silk, in distribution plate and spray silk, between distribution plate, be provided with spray silk screen pack, described spinneret orifice is positioned at the bottom of spray silk lower distribution plate.
As preferably, described distribution plate assembly has 7 layers, and 7 layers of distribution plate assembly are distributed in assembly inner chamber from top to bottom successively, and last one deck of 7 layers of distribution plate assembly is located at the top of spinneret component.
As preferably, between described upper distribution plate and screen pack, be respectively equipped with aluminium backing between middle distribution plate and screen pack, on described spray silk between distribution plate and spray silk screen pack, in spray silk, between distribution plate and a spray screen pack, be respectively equipped with spinnerets aluminium backing, described upper cover body and housing fix by bolt.
As preferably, described ultrahigh molecular weight polypropylene spinning solution flow-guiding mouth, ultra-high molecular weight polyethylene spinning solution flow-guiding mouth, ultrahigh molecular weight polypropylene spinning solution liquid outlet, ultra-high molecular weight polyethylene spinning solution liquid outlet, spinnerets ultrahigh molecular weight polypropylene spinning solution flow-guiding mouth and spinnerets ultra-high molecular weight polyethylene spinning solution flow-guiding mouth are respectively skewed distribution.
The spinning process of core-skin composite fiber, carries out according to the following steps:
(1), the preparation of core-skin type frozen glue strand:
A)
,taking ultrahigh molecular weight polypropylene as the first component raw material, be dissolved in by the mass ratio of 10:1 in the white oil of 50～60 DEG C, form mixture, mixture is carried out to fully emulsified dispersion with high-speed emulsifying machine, then be 0.5% antioxidant to adding mass fraction in said mixture, mass fraction is 0.001% fluorescent whitening agent KSN, again fully emulsified in high-speed emulsifying machine, then being warming up to 110～160 DEG C carries out swelling, again through the extruding of first group of screw extruder, extruder Ge district temperature is at 90～285 DEG C, first group of screw extruder is made up of 16 temperature provinces, the temperature range of 16 temperature provinces is respectively: 108～109 DEG C, 175～176 DEG C, 214～215 DEG C, 237～238 DEG C, 244～245 DEG C, 248～249 DEG C, 250～251 DEG C, 250～251 DEG C, 255～256 DEG C, 258～260 DEG C, 269～270 DEG C, 274～275 DEG C, 275～278 DEG C, 277～282 DEG C, 283～285 DEG C, 283～285 DEG C, after 16 temperature provinces, make it to become molten condition, then the measuring pump of flowing through, after metering, be evenly distributed in the skin composition of core-skin type composite component,
B), taking ultra-high molecular weight polyethylene as second group of raw material, be dissolved in by the mass ratio of 10:1 in the white oil of 50～60 DEG C, form mixture, mixture is carried out to fully emulsified dispersion with high-speed emulsifying machine, then be 0.5% antioxidant to adding mass fraction in said mixture, mass fraction is 0.001% fluorescent whitening agent KSN, again fully emulsified in high-speed emulsifying machine, being warming up to 100～130 DEG C carries out swelling, again through second group of screw extruder, extruder Ge district temperature is at 90～285 DEG C, second group of screw extruder is made up of 16 temperature provinces, the temperature range of 16 temperature provinces is respectively: 108～109 DEG C, 175～176 DEG C, 214～215 DEG C, 237～238 DEG C, 244～245 DEG C, 248～249 DEG C, 250～251 DEG C, 250～251 DEG C, 255～256 DEG C, 258～260 DEG C, 269～270 DEG C, 274～275 DEG C, 274～275 DEG C, 274～275 DEG C, 273～274 DEG C, 272～273 DEG C, after 16 temperature provinces, make it to become molten condition, then the measuring pump of flowing through, after metering, be evenly distributed in the core composition of skin-core structure assembly,
The mass ratio of above-mentioned ultrahigh molecular weight polypropylene and ultra-high molecular weight polyethylene is 2:8～4:6; The kinematic viscosity of above-mentioned white oil is 40 DEG C and assigns 65～75mPaS;
C)
,mixture by the mixture in a) and b), respectively by the viscous state filament of spinneret component and the ejection of distribution plate assembly, forms frozen glue strand after water-setting is cooling respectively;
(2), the balance of frozen glue strand:
Leave the gel fiber of formation in temperature 22～30 DEG C, humidity is, in 65 ± 5% balance, to place 2～3 days, eliminates internal stress, and gel fiber is as-spun fibre;
(3), boundling, preliminary draft in batches:
After balance is placed, follow boundling in batches, preliminary draft, as-spun fibre distributes arrangement on creel, and on orderly importing four roller preliminary draft machines, the tension force that four roller preliminary draft machines runnings produce makes as-spun fibre obtain the preliminary draft power of 3 ~ 5 times;
(4), extraction, dry:
By frozen glue strand good balance, after preliminary draft, in ultrasonic bath, carry out high frequency extraction with agent for carbon hydrogen detergent, the white oil of fiber the inside is cemented out, then dry in the drying box of negative pressure;
Wherein in ultrasonic bath, extract temperature is controlled at 30～40 DEG C, and extraction time is controlled at 20 ~ 30min, and the temperature of drying box is controlled at 40～50 DEG C, is controlled at 15 ~ 20min drying time;
(5), Multi-stage heating drawing-off:
By dried fiber, in the hot case of 130～150 DEG C, carry out the hot drawing-off of 3～4 grades: fiber enters respectively 3 or 4 hot case combinations under the draw ratio of regulation, the drawing temperature of each hot case is set to 130～150 DEG C, total drawing-off ratio of specific heat of hot case combination is 37 ~ 44, carry out 10～15 times of hot drawing-offs, make core-sheath compound fibre;
(6), finished product is reeled and inspection:
Through aforesaid operations step, form the ultrahigh molecular weight polypropylene of certain specification and the core-skin composite fiber of ultra-high molecular weight polyethylene, on up-coiler, carry out finished silk rolling, be processed into the silk volume of constant weight or length, again through the dry uniformity physical property of fracture strength, fiber number, whiteness, oil content, rupture modulus, bar detect qualified after, can be used as finished fiber and sell.
UHMWPP refers to ultrahigh molecular weight polypropylene, and UHMWPE refers to ultra-high molecular weight polyethylene.
Antioxidant used is B225 type antioxidant (compound of antioxidant 1010 and irgasfos 168), and talan bisbenzimidazole type compound used is fluorescent whitening agent KSN.
Compared with one-component superhigh molecular weight polyethylene fibers, have higher temperature tolerance with ultrahigh molecular weight polypropylene/ultrahigh molecular weight polythene (UHMWPP/UHMWPE) core-skin composite fiber, heatproof temperature can be increased to 138 DEG C by 120 DEG C; Creep-resistant property is very significantly improved, and under room temperature, under 30% ultimate strength load, the creep rate of 1000h drops to 0.249% by 0.378%; Interfacial bond property improves, and the single fiber pull-out test intensity in epoxy resin-base is increased to 6.33cN/dtex by 5.86cN/dtex.The composite fibre the present invention relates to has made up that one-component ultra-high molecular weight polyethylene temperature tolerance is poor, the defect of easy creep, can be widely used in the fields such as mooring cable.
UHMWPP/UHMWPE core-skin composite fiber, its cortex and sandwich layer adopt screw extruder independently to extrude, and then form skin-core structure through custom-designed spinneret component.Higher with fusing point, the good ultrahigh molecular weight polypropylene of creep-resistant property is cortex; The ultra-high molecular weight polyethylene light taking quality, intensity is high, modulus is high, resistance to impact is good is sandwich layer, make the composite fibre of skin-core structure, gained composite fibre had both had the advantages such as ultra-high molecular weight polyethylene quality is light, intensity is high, modulus is high, shock-resistant, had again feature high temperature resistant, that creep-resistant property is good, cross section adhesive property is good.Ultra-high molecular weight polyethylene fusing point is 150 DEG C of left and right, and ultrahigh molecular weight polypropylene fusing point is 180 DEG C of left and right, and the fusing point of UHMWPP/UHMWPE composite fibre is 165 DEG C.
As the ultrahigh molecular weight polypropylene of cortical material, similar with ultra-high molecular weight polyethylene sandwich layer fibrous material chemical constitution, compatibility is good, can there is not the phenomenon that core-skin is peeled off in composite fibre, and utilize ultrahigh molecular weight polypropylene as cortex, utilize its good interfacial bond property, improved the poor phenomenon of one-component superhigh molecular weight polyethylene fibers and resin matrix caking property.
Ultra-high molecular weight polyethylene has the advantages such as quality is light, intensity is high, modulus is high, shock-resistant, be a kind of widely used high-new energy fiber, but its temperature tolerance is poor, creep in use easily occurs.And ultrahigh molecular weight polypropylene temperature tolerance is high, creep-resistant property is good, and there is good interfacial bond property, can bear the high drafting in spinning process, all belong to flexible chain macromolecule with ultra-high molecular weight polyethylene, polarity is close, solubility parameters is close, while adopting skin-core structure spinning pack and ultra-high molecular weight polyethylene to produce composite fibre, contact-making surface viscosity is between the two better, the core-sheath compound fibre Stability Analysis of Structures obtaining, there is cortical material high temperature resistant, the feature that creep-resistant property is good, the quality again with superhigh molecular weight polyethylene fibers is light, intensity is high, modulus is high, impact-resistant advantage, the Integrated using function admirable of composite fibre.
Ultrahigh molecular weight polypropylene and ultra-high molecular weight polyethylene all belong to flexible chain macromolecule, simple in structure, polarity is similar, solubility parameters is close, therefore taking ultrahigh molecular weight polypropylene as skin, the composite fibre of the skin-core structure taking ultra-high molecular weight polyethylene as core, there iing good cohesiveness at contact-making surface, thereby can ensure the stability of this complex structure of filament and performance.
Ultra-high molecular weight polyethylene needs through high drafting in spinning process, so selected cortical material also needs to bear high drafting, and ultrahigh molecular weight polypropylene can bear high drafting.
Therefore, UHMWPP of the present invention and UHMWPE core-skin composite fiber, special equipment and spinning process thereof, have high temperature resistantly, and creep-resistant property is good, and cross section adhesive property is good.
Brief description of the drawings
Fig. 1 is the sectional structure schematic diagram of core-skin composite fiber in the present invention;
Fig. 2 is the blast structural representation of special equipment in the present invention;
Fig. 3 is the sectional structure schematic diagram of distribution plate assembly in the present invention;
Fig. 4 be in the present invention spinneret component sectional structure schematic diagram;
Fig. 5 is the upper cover body sectional structure schematic diagram of special equipment in the present invention.
Detailed description of the invention
Below by embodiment, structure accompanying drawing, is described in further detail technical scheme of the present invention.
Embodiment 1: as shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4 and Fig. 5, the core-skin composite fiber of a kind of ultrahigh molecular weight polypropylene and ultra-high molecular weight polyethylene, comprise ultrahigh molecular weight polypropylene layer 1 and ultra-high molecular weight polyethylene layer 2, described ultra-high molecular weight polyethylene layer 2 overcoat have ultrahigh molecular weight polypropylene layer 1, ultrahigh molecular weight polypropylene layer 1 is cortex, ultra-high molecular weight polyethylene layer 2 is sandwich layer, the molecular weight of ultra-high molecular weight polyethylene layer 2 is 5 × 106～6 × 106g/mol, and the molecular weight of ultrahigh molecular weight polypropylene layer 1 is 5 × 105～6 × 105g/mol.
The special equipment of core-skin composite fiber, comprise housing 1, the top of described housing 3 is provided with the upper cover body 4 fixing with housing 3, in described housing 3, be provided with assembly inner chamber 5, in the left end of described upper cover body 4, be provided with the ultra-high molecular weight polyethylene spinning solution material inlet 6 being connected with assembly inner chamber 5, in the right-hand member of described upper cover body 4, be provided with the ultrahigh molecular weight polypropylene spinning solution material inlet 7 being connected with assembly inner chamber 5, the bottom of described assembly inner chamber 5 is provided with spinneret component 8, the top of described spinneret component 8 is provided with distribution plate assembly 9, described distribution plate assembly 9 comprises distribution plate 10, middle distribution plate 11 and lower distribution plate 12, described upper distribution plate 10, middle distribution plate 11 and lower distribution plate 12 distribute from top to bottom successively, between described upper distribution plate 10 and middle distribution plate 11, be provided with screen pack 13, in described upper distribution plate 10, be provided with ultrahigh molecular weight polypropylene spinning solution flow-guiding mouth 14 and ultra-high molecular weight polyethylene spinning solution flow-guiding mouth 15, described ultrahigh molecular weight polypropylene spinning solution flow-guiding mouth 14 is connected with ultrahigh molecular weight polypropylene spinning solution material inlet 7, described ultra-high molecular weight polyethylene spinning solution flow-guiding mouth 15 is connected with ultra-high molecular weight polyethylene spinning solution material inlet 6, in described lower distribution plate 12, be provided with ultrahigh molecular weight polypropylene spinning solution liquid outlet 16 and ultra-high molecular weight polyethylene spinning solution liquid outlet 17, described ultrahigh molecular weight polypropylene spinning solution flow-guiding mouth 14 is connected with ultrahigh molecular weight polypropylene spinning solution liquid outlet 16 by middle distribution plate 11, described ultra-high molecular weight polyethylene spinning solution flow-guiding mouth 15 is connected with ultra-high molecular weight polyethylene spinning solution liquid outlet 17 by middle distribution plate 11, described spinneret component 8 comprises the upper distribution plate 18 of spray silk, distribution plate 19 and spray silk lower distribution plate 20 in spray silk, distribution plate 18 on described spray silk, in spray silk, distribution plate 19 and spray silk lower distribution plate 20 distribute from top to bottom successively, on described spray silk, in distribution plate 18, be provided with the spinnerets ultrahigh molecular weight polypropylene spinning solution flow-guiding mouth 21 being connected with ultrahigh molecular weight polypropylene spinning solution liquid outlet 16, on described spray silk, in distribution plate 18, be provided with the spinnerets ultra-high molecular weight polyethylene spinning solution flow-guiding mouth 22 being connected with ultra-high molecular weight polyethylene spinning solution liquid outlet 17, in described spray silk lower distribution plate 20, be provided with spinnerets guiding gutter 23, spinnerets ring dress baffle liner 24, spinnerets ultra-high molecular weight polyethylene guide hole 25, spinneret orifice 26 and spinnerets baffle liner 27, described spinnerets guiding gutter 23 is connected with spinnerets ultrahigh molecular weight polypropylene spinning solution flow-guiding mouth 21, described spinnerets guiding gutter 23 is connected with spinnerets ring dress baffle liner 24, described spinnerets ring dress baffle liner 24 is connected with spinneret orifice 26, described spinnerets baffle liner 24 is connected with spinnerets ultra-high molecular weight polyethylene spinning solution flow-guiding mouth 22, described spinnerets baffle liner 27 is connected with spinnerets ultra-high molecular weight polyethylene guide hole 25, the bottom of described spinnerets ultra-high molecular weight polyethylene guide hole 25 extends in spinneret orifice 26, described spinnerets guiding gutter 23 is connected with spinnerets ultrahigh molecular weight polypropylene spinning solution flow-guiding mouth 21 by distribution plate 19 in spray silk, described spinnerets baffle liner 27 is connected with spinnerets ultra-high molecular weight polyethylene spinning solution flow-guiding mouth 22 by distribution plate 19 in spray silk, on described spray silk, in distribution plate 18 and spray silk, between distribution plate 19, be provided with spray silk screen pack 28, described spinneret orifice 26 is positioned at the bottom of spray silk lower distribution plate 20.
Described distribution plate assembly 9 has 7 layers, and 7 layers of distribution plate assembly 9 are distributed in assembly inner chamber 5 from top to bottom successively, and last one deck of 7 layers of distribution plate assembly 9 is located at the top of spinneret component 8.
Between described upper distribution plate 10 and screen pack 13, be respectively equipped with aluminium backing 29 between middle distribution plate 11 and screen pack 13, on described spray silk between distribution plate 18 and spray silk screen pack 28, in spray silk, between distribution plate 19 and spray silk screen pack 28, be respectively equipped with spinnerets aluminium backing 30, described upper cover body 4 and housing 3 fix by bolt.
Described ultrahigh molecular weight polypropylene spinning solution flow-guiding mouth 14, ultra-high molecular weight polyethylene spinning solution flow-guiding mouth 15, ultrahigh molecular weight polypropylene spinning solution liquid outlet 16, ultra-high molecular weight polyethylene spinning solution liquid outlet 17, spinnerets ultrahigh molecular weight polypropylene spinning solution flow-guiding mouth 21 and spinnerets ultra-high molecular weight polyethylene spinning solution flow-guiding mouth 22 are respectively skewed distribution.
The spinning process of core-skin composite fiber, carries out according to the following steps:
(1), the preparation of core-skin type frozen glue strand:
?a)
,taking ultrahigh molecular weight polypropylene as the first component raw material, be dissolved in by the mass ratio of 10:1 in the white oil of 50 DEG C, form mixture, mixture is carried out to fully emulsified dispersion with high-speed emulsifying machine, then be 0.5% antioxidant to adding mass fraction in said mixture, mass fraction is 0.001% fluorescent whitening agent KSN, again fully emulsified in high-speed emulsifying machine, then being warming up to 110 DEG C carries out swelling, again through the extruding of first group of screw extruder, extruder Ge district temperature is at 90～285 DEG C, first group of screw extruder is made up of 16 temperature provinces, the temperature range of 16 temperature provinces is respectively: 108 DEG C, 175 DEG C, 214 DEG C, 237 DEG C, 244 DEG C, 248 DEG C, 250 DEG C, 250 DEG C, 255 DEG C, 258 DEG C, 269 DEG C, 274 DEG C, 275 DEG C, 277 DEG C, 283 DEG C, 283 DEG C, after 16 temperature provinces, make it to become molten condition, then the measuring pump of flowing through, after metering, be evenly distributed in the skin composition of core-skin type composite component,
B), taking ultra-high molecular weight polyethylene as second group of raw material, be dissolved in by the mass ratio of 10:1 in the white oil of 50 DEG C, form mixture, mixture is carried out to fully emulsified dispersion with high-speed emulsifying machine, then be 0.5% antioxidant to adding mass fraction in said mixture, mass fraction is 0.001% fluorescent whitening agent KSN, again fully emulsified in high-speed emulsifying machine, being warming up to 100 DEG C carries out swelling, again through second group of screw extruder, extruder Ge district temperature is at 90～285 DEG C, second group of screw extruder is made up of 16 temperature provinces, the temperature range of 16 temperature provinces is respectively: 108 DEG C, 175 DEG C, 214 DEG C, 237 DEG C, 244 DEG C, 248 DEG C, 250 DEG C, 250 DEG C, 255 DEG C, 258 DEG C, 269 DEG C, 274 DEG C, 274 DEG C, 274 DEG C, 273 DEG C, 272 DEG C, after 16 temperature provinces, make it to become molten condition, then the measuring pump of flowing through, after metering, be evenly distributed in the core composition of skin-core structure assembly,
The mass ratio of above-mentioned ultrahigh molecular weight polypropylene and ultra-high molecular weight polyethylene is 2:8; The kinematic viscosity of above-mentioned white oil is 40 DEG C and assigns 65mPaS;
C)
,mixture by the mixture in a) and b), respectively by the viscous state filament of spinneret component and the ejection of distribution plate assembly, forms frozen glue strand after water-setting is cooling respectively;
(2), the balance of frozen glue strand:
Leave the gel fiber of formation in temperature 22 DEG C, humidity is, in 60% balance, to place 2 days, eliminates internal stress, and gel fiber is as-spun fibre;
(3), boundling, preliminary draft in batches:
After balance is placed, follow boundling in batches, preliminary draft, as-spun fibre distributes arrangement on creel, and on orderly importing four roller preliminary draft machines, the tension force that four roller preliminary draft machines runnings produce makes as-spun fibre obtain the preliminary draft power of 3 times;
(4), extraction, dry:
By frozen glue strand good balance, after preliminary draft, in ultrasonic bath, carry out high frequency extraction with agent for carbon hydrogen detergent, the white oil of fiber the inside is cemented out, then dry in the drying box of negative pressure;
Wherein in ultrasonic bath, extract temperature is controlled at 30 DEG C, and extraction time is controlled at 20min, and the temperature of drying box is controlled at 40 DEG C, is controlled at 15min drying time;
(5), Multi-stage heating drawing-off:
By dried fiber, in the hot case of 130 DEG C, carry out the hot drawing-off of 3 grades: fiber enters respectively 3 hot case combinations under the draw ratio of regulation, the drawing temperature of each hot case is set to 130 DEG C, total drawing-off ratio of specific heat of hot case combination is 37, carry out 10 times of hot drawing-offs, make core-sheath compound fibre;
(6), finished product is reeled and inspection:
Through aforesaid operations step, form the ultrahigh molecular weight polypropylene of certain specification and the core-skin composite fiber of ultra-high molecular weight polyethylene, on up-coiler, carry out finished silk rolling, be processed into the silk volume of constant weight or length, again through the dry uniformity physical property of fracture strength, fiber number, whiteness, oil content, rupture modulus, bar detect qualified after, can be used as finished fiber and sell.
Embodiment 2: the spinning process of core-skin composite fiber, carries out according to the following steps:
(1), the preparation of core-skin type frozen glue strand:
?a)
,taking ultrahigh molecular weight polypropylene as the first component raw material, be dissolved in by the mass ratio of 10:1 in the white oil of 55 DEG C, form mixture, mixture is carried out to fully emulsified dispersion with high-speed emulsifying machine, then be 0.5% antioxidant to adding mass fraction in said mixture, mass fraction is 0.001% fluorescent whitening agent KSN, again fully emulsified in high-speed emulsifying machine, then being warming up to 140 DEG C carries out swelling, again through the extruding of first group of screw extruder, extruder Ge district temperature is at 90～285 DEG C, first group of screw extruder is made up of 16 temperature provinces, the temperature range of 16 temperature provinces is respectively: 108.5 DEG C, 175.5 DEG C, 214.5 DEG C, 237.5 DEG C, 244.5 DEG C, 248.5 DEG C, 250.5 DEG C, 250.5 DEG C, 255.5 DEG C, 259 DEG C, 269.5 DEG C, 274.5 DEG C, 276 DEG C, 280 DEG C, 284 DEG C, 284 DEG C, after 16 temperature provinces, make it to become molten condition, then the measuring pump of flowing through, after metering, be evenly distributed in the skin composition of core-skin type composite component,
B), taking ultra-high molecular weight polyethylene as second group of raw material, be dissolved in by the mass ratio of 10:1 in the white oil of 55 DEG C, form mixture, mixture is carried out to fully emulsified dispersion with high-speed emulsifying machine, then be 0.5% antioxidant to adding mass fraction in said mixture, mass fraction is 0.001% fluorescent whitening agent KSN, again fully emulsified in high-speed emulsifying machine, being warming up to 120 DEG C carries out swelling, again through second group of screw extruder, extruder Ge district temperature is at 90～285 DEG C, second group of screw extruder is made up of 16 temperature provinces, the temperature range of 16 temperature provinces is respectively: 108.5 DEG C, 175.5 DEG C, 214.5 DEG C, 237.5 DEG C, 244.5 DEG C, 248.5 DEG C, 250.5 DEG C, 250.5 DEG C, 255.5 DEG C, 259 DEG C, 269.5 DEG C, 274.5 DEG C, 274.5 DEG C, 274.5 DEG C, 273.5 DEG C, 272.5 DEG C, after 16 temperature provinces, make it to become molten condition, then the measuring pump of flowing through, after metering, be evenly distributed in the core composition of skin-core structure assembly,
The mass ratio of above-mentioned ultrahigh molecular weight polypropylene and ultra-high molecular weight polyethylene is 4:6; The kinematic viscosity of above-mentioned white oil is 40 DEG C and assigns 70mPaS;
C)
,mixture by the mixture in a) and b), respectively by the viscous state filament of spinneret component and the ejection of distribution plate assembly, forms frozen glue strand after water-setting is cooling respectively;
(2), the balance of frozen glue strand:
Leave the gel fiber of formation in temperature 28 DEG C, humidity is, in 65% balance, to place 3 days, eliminates internal stress, and gel fiber is as-spun fibre;
(3), boundling, preliminary draft in batches:
After balance is placed, follow boundling in batches, preliminary draft, as-spun fibre distributes arrangement on creel, and on orderly importing four roller preliminary draft machines, the tension force that four roller preliminary draft machines runnings produce makes as-spun fibre obtain the preliminary draft power of 4 times;
(4), extraction, dry:
By frozen glue strand good balance, after preliminary draft, in ultrasonic bath, carry out high frequency extraction with agent for carbon hydrogen detergent, the white oil of fiber the inside is cemented out, then dry in the drying box of negative pressure;
Wherein in ultrasonic bath, extract temperature is controlled at 35 DEG C, and extraction time is controlled at 25min, and the temperature of drying box is controlled at 45 DEG C, is controlled at 18min drying time;
(5), Multi-stage heating drawing-off:
By dried fiber, in the hot case of 140 DEG C, carry out the hot drawing-off of 4 grades: fiber enters respectively 4 hot case combinations under the draw ratio of regulation, the drawing temperature of each hot case is set to 140 DEG C, total drawing-off ratio of specific heat of hot case combination is 40, carry out 13 times of hot drawing-offs, make core-sheath compound fibre;
(6), finished product is reeled and inspection:
Through aforesaid operations step, form the ultrahigh molecular weight polypropylene of certain specification and the core-skin composite fiber of ultra-high molecular weight polyethylene, on up-coiler, carry out finished silk rolling, be processed into the silk volume of constant weight or length, again through the dry uniformity physical property of fracture strength, fiber number, whiteness, oil content, rupture modulus, bar detect qualified after, can be used as finished fiber and sell.
Embodiment 3: the spinning process of core-skin composite fiber, carries out according to the following steps:
(1), the preparation of core-skin type frozen glue strand:
?a)
,taking ultrahigh molecular weight polypropylene as the first component raw material, be dissolved in by the mass ratio of 10:1 in the white oil of 60 DEG C, form mixture, mixture is carried out to fully emulsified dispersion with high-speed emulsifying machine, then be 0.5% antioxidant to adding mass fraction in said mixture, mass fraction is 0.001% fluorescent whitening agent KSN, again fully emulsified in high-speed emulsifying machine, then being warming up to 160 DEG C carries out swelling, again through the extruding of first group of screw extruder, extruder Ge district temperature is at 90～285 DEG C, first group of screw extruder is made up of 16 temperature provinces, the temperature range of 16 temperature provinces is respectively: 109 DEG C, 176 DEG C, 215 DEG C, 238 DEG C, 245 DEG C, 249 DEG C, 251 DEG C, 251 DEG C, 256 DEG C, 260 DEG C, 270 DEG C, 275 DEG C, 278 DEG C, 282 DEG C, 285 DEG C, 285 DEG C, after 16 temperature provinces, make it to become molten condition, then the measuring pump of flowing through, after metering, be evenly distributed in the skin composition of core-skin type composite component,
B), taking ultra-high molecular weight polyethylene as second group of raw material, be dissolved in by the mass ratio of 10:1 in the white oil of 60 DEG C, form mixture, mixture is carried out to fully emulsified dispersion with high-speed emulsifying machine, then be 0.5% antioxidant to adding mass fraction in said mixture, mass fraction is 0.001% fluorescent whitening agent KSN, again fully emulsified in high-speed emulsifying machine, being warming up to 130 DEG C carries out swelling, again through second group of screw extruder, extruder Ge district temperature is at 90～285 DEG C, second group of screw extruder is made up of 16 temperature provinces, the temperature range of 16 temperature provinces is respectively: 109 DEG C, 176 DEG C, 215 DEG C, 238 DEG C, 245 DEG C, 249 DEG C, 251 DEG C, 251 DEG C, 256 DEG C, 260 DEG C, 270 DEG C, 275 DEG C, 275 DEG C, 275 DEG C, 274 DEG C, 273 DEG C, after 16 temperature provinces, make it to become molten condition, then the measuring pump of flowing through, after metering, be evenly distributed in the core composition of skin-core structure assembly,
The mass ratio of above-mentioned ultrahigh molecular weight polypropylene and ultra-high molecular weight polyethylene is 4:6; The kinematic viscosity of above-mentioned white oil is 40 DEG C and assigns 75mPaS;
C)
,mixture by the mixture in a) and b), respectively by the viscous state filament of spinneret component and the ejection of distribution plate assembly, forms frozen glue strand after water-setting is cooling respectively;
(2), the balance of frozen glue strand:
Leave the gel fiber of formation in temperature 22～30 DEG C, humidity is, in 65 ± 5% balance, to place 3 days, eliminates internal stress, and gel fiber is as-spun fibre;
(3), boundling, preliminary draft in batches:
After balance is placed, follow boundling in batches, preliminary draft, as-spun fibre distributes arrangement on creel, and on orderly importing four roller preliminary draft machines, the tension force that four roller preliminary draft machines runnings produce makes as-spun fibre obtain the preliminary draft power of 5 times;
(4), extraction, dry:
By frozen glue strand good balance, after preliminary draft, in ultrasonic bath, carry out high frequency extraction with agent for carbon hydrogen detergent, the white oil of fiber the inside is cemented out, then dry in the drying box of negative pressure;
Wherein in ultrasonic bath, extract temperature is controlled at 40 DEG C, and extraction time is controlled at 30min, and the temperature of drying box is controlled at 50 DEG C, is controlled at 20min drying time;
(5), Multi-stage heating drawing-off:
By dried fiber, in the hot case of 150 DEG C, carry out the hot drawing-off of 4 grades: fiber enters respectively 4 hot case combinations under the draw ratio of regulation, the drawing temperature of each hot case is set to 150 DEG C, total drawing-off ratio of specific heat of hot case combination is 44, carry out 15 times of hot drawing-offs, make core-sheath compound fibre;
(6), finished product is reeled and inspection:
Through aforesaid operations step, form the ultrahigh molecular weight polypropylene of certain specification and the core-skin composite fiber of ultra-high molecular weight polyethylene, on up-coiler, carry out finished silk rolling, be processed into the silk volume of constant weight or length, again through the dry uniformity physical property of fracture strength, fiber number, whiteness, oil content, rupture modulus, bar detect qualified after, can be used as finished fiber and sell.
Claims (6)
1. the core-skin composite fiber of a UHMWPP and UHMWPE, it is characterized in that: comprise ultrahigh molecular weight polypropylene layer (1) and ultra-high molecular weight polyethylene layer (2), described ultra-high molecular weight polyethylene layer (2) overcoat has ultrahigh molecular weight polypropylene layer (1), ultrahigh molecular weight polypropylene layer (1) is cortex, ultra-high molecular weight polyethylene layer (2) is sandwich layer, the molecular weight of ultra-high molecular weight polyethylene layer (2) is 5 × 106～6 × 106g/mol, and the molecular weight of ultrahigh molecular weight polypropylene layer (1) is 5 × 105～6 × 105g/mol.
2. the special equipment of core-skin composite fiber according to claim 1, it is characterized in that: comprise housing (3), the top of described housing (3) is provided with the upper cover body (4) fixing with housing (3), in described housing (3), be provided with assembly inner chamber (5), in the left end of described upper cover body (4), be provided with the ultra-high molecular weight polyethylene spinning solution material inlet (6) being connected with assembly inner chamber (5), in the right-hand member of described upper cover body (4), be provided with the ultrahigh molecular weight polypropylene spinning solution material inlet (7) being connected with assembly inner chamber (5), the bottom of described assembly inner chamber (5) is provided with spinneret component (8), the top of described spinneret component (8) is provided with distribution plate assembly (9), described distribution plate assembly (9) comprises distribution plate (10), middle distribution plate (11) and lower distribution plate (12), described upper distribution plate (10), middle distribution plate (11) and lower distribution plate (12) distribute from top to bottom successively, between described upper distribution plate (10) and middle distribution plate (11), be provided with screen pack (13), in described upper distribution plate (10), be provided with ultrahigh molecular weight polypropylene spinning solution flow-guiding mouth (14) and ultra-high molecular weight polyethylene spinning solution flow-guiding mouth (15), described ultrahigh molecular weight polypropylene spinning solution flow-guiding mouth (14) is connected with ultrahigh molecular weight polypropylene spinning solution material inlet (7), described ultra-high molecular weight polyethylene spinning solution flow-guiding mouth (15) is connected with ultra-high molecular weight polyethylene spinning solution material inlet (6), in described lower distribution plate (12), be provided with ultrahigh molecular weight polypropylene spinning solution liquid outlet (16) and ultra-high molecular weight polyethylene spinning solution liquid outlet (17), described ultrahigh molecular weight polypropylene spinning solution flow-guiding mouth (14) is connected with ultrahigh molecular weight polypropylene spinning solution liquid outlet (16) by middle distribution plate (11), described ultra-high molecular weight polyethylene spinning solution flow-guiding mouth (15) is connected with ultra-high molecular weight polyethylene spinning solution liquid outlet (17) by middle distribution plate (11), described spinneret component (8) comprises the upper distribution plate (18) of spray silk, distribution plate (19) and spray silk lower distribution plate (20) in spray silk, distribution plate (18) on described spray silk, in spray silk, distribution plate (19) and spray silk lower distribution plate (20) distribute from top to bottom successively, on described spray silk, in distribution plate (18), be provided with the spinnerets ultrahigh molecular weight polypropylene spinning solution flow-guiding mouth (21) being connected with ultrahigh molecular weight polypropylene spinning solution liquid outlet (16), on described spray silk, in distribution plate (18), be provided with the spinnerets ultra-high molecular weight polyethylene spinning solution flow-guiding mouth (22) being connected with ultra-high molecular weight polyethylene spinning solution liquid outlet (17), in described spray silk lower distribution plate (20), be provided with spinnerets guiding gutter (23), spinnerets ring dress baffle liner (24), spinnerets ultra-high molecular weight polyethylene guide hole (25), spinneret orifice (26) and spinnerets baffle liner (27), described spinnerets guiding gutter (23) is connected with spinnerets ultrahigh molecular weight polypropylene spinning solution flow-guiding mouth (21), described spinnerets guiding gutter (23) is connected with spinnerets ring dress baffle liner (24), described spinnerets ring dress baffle liner (24) is connected with spinneret orifice (26), described spinnerets baffle liner (24) is connected with spinnerets ultra-high molecular weight polyethylene spinning solution flow-guiding mouth (22), described spinnerets baffle liner (27) is connected with spinnerets ultra-high molecular weight polyethylene guide hole (25), the bottom of described spinnerets ultra-high molecular weight polyethylene guide hole (25) extends in spinneret orifice (26), described spinnerets guiding gutter (23) is connected with spinnerets ultrahigh molecular weight polypropylene spinning solution flow-guiding mouth (21) by distribution plate (19) in spray silk, described spinnerets baffle liner (27) is connected with spinnerets ultra-high molecular weight polyethylene spinning solution flow-guiding mouth (22) by distribution plate (19) in spray silk, on described spray silk, in distribution plate (18) and spray silk, between distribution plate (19), be provided with spray silk screen pack (28), described spinneret orifice (26) is positioned at the bottom of spray silk lower distribution plate (20).
3. the special equipment of core-skin composite fiber according to claim 2, it is characterized in that: described distribution plate assembly (9) has 7 layers, 7 layers of distribution plate assembly (9) are distributed in assembly inner chamber (5) from top to bottom successively, and last one deck of 7 layers of distribution plate assembly (9) is located at the top of spinneret component (8).
4. according to the special equipment of the core-skin composite fiber described in claim 2 or 3, it is characterized in that: between described upper distribution plate (10) and screen pack (13), be respectively equipped with aluminium backing (29) between middle distribution plate (11) and screen pack (13), on described spray silk between distribution plate (18) and spray silk screen pack (28), in spray silk, between distribution plate (19) and spray silk screen pack (28), be respectively equipped with spinnerets aluminium backing (30), described upper cover body (4) and housing (3) fix by bolt.
5. according to the special equipment of the core-skin composite fiber described in claim 2 or 3, it is characterized in that: described ultrahigh molecular weight polypropylene spinning solution flow-guiding mouth (14), ultra-high molecular weight polyethylene spinning solution flow-guiding mouth (15), ultrahigh molecular weight polypropylene spinning solution liquid outlet (16), ultra-high molecular weight polyethylene spinning solution liquid outlet (17), spinnerets ultrahigh molecular weight polypropylene spinning solution flow-guiding mouth (21) and spinnerets ultra-high molecular weight polyethylene spinning solution flow-guiding mouth (22) are respectively skewed distribution.
6. according to the spinning process of the core-skin composite fiber described in claim 1 or 2 or 3, it is characterized in that carrying out according to the following steps:
(1), the preparation of core-skin type frozen glue strand:
?a)
,taking ultrahigh molecular weight polypropylene as the first component raw material, be dissolved in by the mass ratio of 10:1 in the white oil of 50～60 DEG C, form mixture, mixture is carried out to fully emulsified dispersion with high-speed emulsifying machine, then be 0.5% antioxidant to adding mass fraction in said mixture, mass fraction is 0.001% fluorescent whitening agent KSN, again fully emulsified in high-speed emulsifying machine, then being warming up to 110～160 DEG C carries out swelling, again through the extruding of first group of screw extruder, extruder Ge district temperature is at 90～285 DEG C, first group of screw extruder is made up of 16 temperature provinces, the temperature range of 16 temperature provinces is respectively: 108～109 DEG C, 175～176 DEG C, 214～215 DEG C, 237～238 DEG C, 244～245 DEG C, 248～249 DEG C, 250～251 DEG C, 250～251 DEG C, 255～256 DEG C, 258～260 DEG C, 269～270 DEG C, 274～275 DEG C, 275～278 DEG C, 277～282 DEG C, 283～285 DEG C, 283～285 DEG C, after 16 temperature provinces, make it to become molten condition, then the measuring pump of flowing through, after metering, be evenly distributed in the skin composition of core-skin type composite component,
B), taking ultra-high molecular weight polyethylene as second group of raw material, be dissolved in by the mass ratio of 10:1 in the white oil of 50～60 DEG C, form mixture, mixture is carried out to fully emulsified dispersion with high-speed emulsifying machine, then be 0.5% antioxidant to adding mass fraction in said mixture, mass fraction is 0.001% fluorescent whitening agent KSN, again fully emulsified in high-speed emulsifying machine, being warming up to 100～130 DEG C carries out swelling, again through second group of screw extruder, extruder Ge district temperature is at 90～285 DEG C, second group of screw extruder is made up of 16 temperature provinces, the temperature range of 16 temperature provinces is respectively: 108～109 DEG C, 175～176 DEG C, 214～215 DEG C, 237～238 DEG C, 244～245 DEG C, 248～249 DEG C, 250～251 DEG C, 250～251 DEG C, 255～256 DEG C, 258～260 DEG C, 269～270 DEG C, 274～275 DEG C, 274～275 DEG C, 274～275 DEG C, 273～274 DEG C, 272～273 DEG C, after 16 temperature provinces, make it to become molten condition, then the measuring pump of flowing through, after metering, be evenly distributed in the core composition of skin-core structure assembly,
The mass ratio of above-mentioned ultrahigh molecular weight polypropylene and ultra-high molecular weight polyethylene is 2:8～4:6; The kinematic viscosity of above-mentioned white oil is 40 DEG C and assigns 65～75mPaS;
C)
,mixture by the mixture in a) and b), respectively by the viscous state filament of spinneret component and the ejection of distribution plate assembly, forms frozen glue strand after water-setting is cooling respectively;
(2), the balance of frozen glue strand:
Leave the gel fiber of formation in temperature 22～30 DEG C, humidity is, in 65 ± 5% balance, to place 2～3 days, eliminates internal stress, and gel fiber is as-spun fibre;
(3), boundling, preliminary draft in batches:
After balance is placed, follow boundling in batches, preliminary draft, as-spun fibre distributes arrangement on creel, and on orderly importing four roller preliminary draft machines, the tension force that four roller preliminary draft machines runnings produce makes as-spun fibre obtain the preliminary draft power of 3 ~ 5 times;
(4), extraction, dry:
By frozen glue strand good balance, after preliminary draft, in ultrasonic bath, carry out high frequency extraction with agent for carbon hydrogen detergent, the white oil of fiber the inside is cemented out, then dry in the drying box of negative pressure;
Wherein in ultrasonic bath, extract temperature is controlled at 30～40 DEG C, and extraction time is controlled at 20 ~ 30min, and the temperature of drying box is controlled at 40～50 DEG C, is controlled at 15 ~ 20min drying time;
(5), Multi-stage heating drawing-off:
By dried fiber, in the hot case of 130～150 DEG C, carry out the hot drawing-off of 3～4 grades: fiber enters respectively 3 or 4 hot case combinations under the draw ratio of regulation, the drawing temperature of each hot case is set to 130～150 DEG C, total drawing-off ratio of specific heat of hot case combination is 37 ~ 44, carry out 10～15 times of hot drawing-offs, make core-sheath compound fibre;
(6), finished product is reeled and inspection:
Through aforesaid operations step, form the ultrahigh molecular weight polypropylene of certain specification and the core-skin composite fiber of ultra-high molecular weight polyethylene, on up-coiler, carry out finished silk rolling, be processed into the silk volume of constant weight or length, again through the dry uniformity physical property of fracture strength, fiber number, whiteness, oil content, rupture modulus, bar detect qualified after, can be used as finished fiber and sell.
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