CN107523886A - A kind of low adhesion spinning melt pipeline - Google Patents

Abstract

A kind of low adhesion spinning melt pipeline of the present invention, melt pipe includes melt pipe outer barrel and melt pipe bushing, melt pipe bushing is located at melt pipe outer barrel, concavo-convex anti-adhesion structure is both provided with the inwall with the part of molten polymer joint of melt pipe bushing, it is possible to achieve anti-adhesive attraction of the polymer melt in filament spinning component；Concavo-convex anti-adhesion structure includes sunk part and bossing, bossing is higher by the setting of member internal walls surface, directly contacting between highly viscous polymer melt and member internal walls is reduced using supporting role between points, and gas suspension effect is formed in the presence of HTHP melt, plays and is prevented adhesion from separate type.

Description

A kind of low adhesion spinning melt pipeline

Technical field

The present invention relates to textile technology field, and in particular to a kind of low adhesion spinning melt pipeline.

Background technology

The BP of 1845 is come from the earliest record of melt spinning process.Nineteen thirty-nine melt spinning is as manufacture nylon The production technology of 66 fibers obtains industrial applications.Melt spinning basic process include material melts, from spinneret micropore extrusion, Melt stream cooling and solidifying shaping.Manufactured long filament can be used bobbin coiling and molding or carry out other processing.In melt spinning During, polymer feeding extruder, it is tired to be sent to metering further along after screw rod transmission, plasticizing, melting:Metering is poly- to pass through essence Really metering ensures that the melt of polymer can be flowed into stable and uniform in critical component filament spinning component, the melt in filament spinning component By the filtering of filter medium, eliminating to be provided with porous spinneret by high pressure press-in after impurity and bubble turns into thread；Carefully Stream is while cooling (quenching) quick by horizontal blowing, because the effect of following wireline reel also produces super drawing so that diameter Attenuate；As-spun fibre is wound into certain package. 

Under normal circumstances filament spinning component be mainly be made up of upper strata excessively stream lid, wire netting and filter sand filter layer, distribution plate and Porous spinneret is formed.Spinning melt is after top-level entries flow into filament spinning component, the mistake for type of being lain prone via the back taper minister in ancient times in sand chamber Stream lid diffusely enters in the inner chamber of component, and filtration combination layer is ingeniously entered in the presence of upper stressor layer.Filter layer generally has multilayer Screen pack and METALLIC FILTRATION SAND composition.The a piece of coarse net for not luring steel wire to weave into often is laid in the superiors of filter layer, turns into cover net Or cover net, it is therefore an objective to which the debris for stopping bulk and the layer of sand for preventing bottom move.When being filtered using filter sand, in principle by sand grains Granularity is carefully sequentially arranged by thick.When placing multistorey strainer mesh, and by the descending principle of mesh size.In filtration combination layer The bottom laid one layer of supporting network, it be typically be made up of a piece of or two panels coarse net, it is therefore an objective to support upper level filter layer, Increase longitudinal rigidity, have the function that not to be depressed, it can also prevent from draining to the effect of spinneret orifice under broken filter sand sometimes.By Melt after fine filtering is flowed into the hole of distribution plate.On the one hand the effect of distribution plate is to play support upper level filter layer, another Aspect is before polymer melt is assigned into spinneret plate as homogeneously as possible so that the uniform flow per hole, also tubing flow displacement filament plate The melt pressure of part is shared so that spinning plate surface is unlikely to superpressure and deformed.Polymer melt is squeezed into spinneret Guide hole after, micropore gives the certain shape of melt and is extruded as strand, finishes to dazzle body like this inside filament spinning component The design of the filament spinning component of flowing need to mainly determine its structure snd size.Wherein component external structure snd size mainly need to examine The problems such as considering the intensity and corrosion resistance of itself, the problem of also relating to installing/dismounting and sealing.The inside member of filament spinning component Part just really carries main spinning function, it should how to select filtration combination element, hybrid element, distribution member and spinneret Panel element etc., it is necessary to comprehensive to go fully to be calculated and considered from multi-angles such as hydrodynamics, melt rheology and heat conductions. Certainly the problem of inner sealing of each element and strong rigidity can not be ignored while design.Melt spinning is to carry out at high temperature , if polymer melt is chronically at high humidity state, it may occur that degraded influences the quality of precursor, and institute W is inside design component During passage, melt should be made to be uniformly distributed in each micropore of spinneret as far as possible, channel resistance should be equal, can not exist in component Dead angle, in case melt residence time is long and decomposes.It should process smooth with king's part surface of melt contacts, it is impossible to make thing Material is detained due to wall surface resistance.Fluid motion uniformity mainly includes fluid motion speed, pressure, stop in  filament spinning components The contents such as time, discharging distribution.Preferable filament spinning component should be able to ensure that above-mentioned parameter is all identical simultaneously, and sample presentation just can ensure that Polymer melt is evenly distributed in each spinneret orifice of spinneret with identical matter, and it is uniformly high-quality finally to spin out structural behaviour Measure fiber.However, the factor for influenceing flow field uniformity in filament spinning component is numerous, wherein mainly having material properties, process conditions, setting Standby structural parameters etc..When the above two control identical, device structure is its most important influence factor again. 

The flow behavior of   polymer melts is more complex compared with for small molecule solution.Under external force, melt is not only Irreversible viscous yielding is shown, but also shows reversible elastic deformation.Because the flowing of polymer is not Simple Relative sliding between macromolecular chain, but the overall result of moving cell transition successively.Under external force, macromolecular chain Inevitably stretched along external force direction, remove external force, macromolecular chain will be spontaneously rolled up again.This conformation change Caused elastically-deformable development and Recovery Process are relaxation, and the process depends on polymer molecular weight, external force acts on Time, temperature etc..It is the outward appearance of elastic deformation and its subsequent lax pair fiber, dimensional stability, interior in molding process Stress etc. has substantial connection.

Filament spinning component is mainly filter layer, the distribution being made up of upper strata excessively stream lid, wire netting and filter sand under normal circumstances Plate and porous spinneret are formed.Spinning melt is lain prone type after top-level entries flow into filament spinning component via the back taper minister in ancient times in sand chamber Excessively stream lid diffusely into component inner chamber in, filtration combination layer is ingeniously entered in the presence of upper stressor layer.Filter layer generally has Multiple filtration net and METALLIC FILTRATION SAND composition.The a piece of coarse net for not luring steel wire to weave into often is laid in the superiors of filter layer, is turned into Cover net or cover net, it is therefore an objective to which the debris for stopping bulk and the layer of sand for preventing bottom move.When being filtered using filter sand, press in principle Grit size is carefully sequentially arranged by thick.When placing multistorey strainer mesh, and by the descending principle of mesh size.In filtering group The bottom for closing layer has laid one layer of supporting network, and it is typically to be made up of a piece of or two panels coarse net, it is therefore an objective to supports upper strata mistake Filtering layer, increase longitudinal rigidity, have the function that not to be depressed, it can also prevent from draining to the work of spinneret orifice under broken filter sand sometimes With.Melt after fine filtering is flowed into the hole of distribution plate.On the one hand the effect of distribution plate is to play support upper level filter Layer, is on the other hand before polymer melt is assigned into spinneret plate as homogeneously as possible so that the uniform flow per hole, is also replaced Spinneret has shared the melt pressure of part so that spinning plate surface is unlikely to superpressure and deformed.Polymer melt is squeezed into After the guide hole of spinneret, micropore gives the certain shape of melt and is extruded as strand, finishes to dazzle body like this in spinning group The design of the filament spinning component of part internal flow need to mainly determine its structure snd size.Wherein component external structure snd size are main The problems such as needing to consider the intensity and corrosion resistance of itself, the problem of also relating to installing/dismounting and sealing.Filament spinning component Inner member just really carries main spinning function, it should how to select filtration combination element, hybrid element, distribution member With spinneret panel element etc., it is necessary to it is comprehensive to go fully to calculate from multi-angles such as hydrodynamics, melt rheology and heat conductions And consideration.Certainly the problem of inner sealing of each element and strong rigidity can not be ignored while design.Melt spinning is in height The lower progress of temperature, if polymer melt is chronically at high humidity state, it may occur that degraded influences the quality of precursor, and institute W is being designed During component internal passage, melt should be made to be uniformly distributed in each micropore of spinneret as far as possible, channel resistance should be equal, in component There can not be dead angle, in case melt residence time is long and decomposes.It should process smooth with king's part surface of melt contacts, Material can not be made to be detained due to wall surface resistance.Fluid motion uniformity mainly includes fluid motion speed, pressure in  filament spinning components The contents such as power, residence time, discharging distribution.Preferable filament spinning component should be able to ensure that above-mentioned parameter is all identical simultaneously, sample presentation It just can ensure that polymer melt is evenly distributed in each spinneret orifice of spinneret with identical matter, it is equal finally to spin out structural behaviour Even high quality fibers.However, the factor for influenceing flow field uniformity in filament spinning component is numerous, wherein mainly having material properties, work Skill condition, device structure parameter etc..When the above two control identical, device structure is its most important influence factor again.

The flow behavior of polymer melt is more complex compared with for small molecule solution.Under external force, melt is not Irreversible viscous yielding is only shown, but also shows reversible elastic deformation.Because the flowing of polymer is not It is simple Relative sliding between macromolecular chain, but the overall result of moving cell transition successively.Under external force, macromolecule Chain is inevitably stretched along external force direction, removes external force, and macromolecular chain will be spontaneously rolled up again.This conformation becomes Elastically-deformable development and Recovery Process caused by changing are relaxation, and the process depends on polymer molecular weight, outer masterpiece With time, temperature etc..In molding process, the outward appearance of elastic deformation and its subsequent lax pair fiber, dimensional stability, Internal stress etc. has substantial connection.

High polymer molten viscosity is cut flowing and is mainly characterized in that:It is very high to cut viscosity；Viscosity strong depend-ence trimming speed is cut, absolutely Most of high polymer moltens belong to pseudoplastic fluid；Velocity flow profile of the pseudoplastic behavior high polymer molten in pipe is not parabolically It is linear, and plunger flow is close to, velocity gradient concentrates on near-wall, is moved that may have tube wall to slide in some cases, Molecular-weight gradation effect is there may also be in flowing, low molecular weight fraction is more than pipe axle in near-wall.

It is not constant temperature process in actual production process, and is unstable state, but above-mentioned " spinnability " is theoretical, it is right The forming process of chemical fibre still has preferably reference and directive significance, and the principal element drawn from " spinnability " in theoretical is all It is the factor for controlling spinning to be smoothed out.Such as be viscosity and surface tension to capillary mechanism major influence factors, to cohesive energy The principal element that failure mechanism influences is deformation speed and viscoplasticity size etc..Understanding the spinnability principle of melt contributes to us When adjusting spinning technique, optimal conditions are targetedly selected, so as to avoid occurring wild effect in spinning.Change and spin The rheological property of silk Wang Yi parameters and raw material may cause the variable element scope for stablizing spinning fully to increase, convenient and technique Adjustment. 

Because the high temperature polymer melt of melting needs to shift and flow, therefore, high-temperature fusant and spinning group in filament spinning component Part quality inspection inevitably there are contact, adhesion on the inwall of filament spinning component also just inevitably be present, although At present when preparing filament spinning component can by the smooth enough of its inwall processing, largely reduced due to Inner wall surface problem and caused by attachment of polymers, still, due to the limitation of machining accuracy and process technology, it is difficult to accomplish inwall It is completely smooth, still can so produces the adhesion of polymer；Also have in the prior art in spinning process in polymer and spinning The scheme of lubricant is added between the inwall of component, can so play certain anti-adhesiving effect, but what these were added Lubricant will certainly be entered in polymer, and then the property of polymer and the property of follow-up spinning produce unpredictable shadow Ring, and it is worthless.Due to the adhesion of the polymer in spinning process, all needed after the production schedule of a batch is not completed Filament spinning component thoroughly to be cleaned, the cleaning to filament spinning component can cause time and cost greatly to consume, but also It is difficult to be cleaned that some dead angles, which can be there are, and follow-up production can be adversely affected again.Therefore, exploitation one is needed badly Kind new low adhesion of filament spinning component or anti-blocking techniques, the shortcomings that to overcome in the prior art.

The content of the invention

Above-mentioned technical problem be present for prior art, the present invention, which provides one kind, can significantly reduce polymer melt molten The novel spinning melt pipe adhered on body pipeline.

To achieve the above object, the present invention provides following technical scheme：

A kind of low adhesion spinning melt pipeline, the melt pipe include melt pipe outer barrel and melt pipe bushing, melt pipe Road bushing is located at melt pipe outer barrel；The melt pipe outer barrel and melt pipe bushing are respectively provided with the head end and tail of opening End, the melt pipe bushing is interior to form inner chamber, is left between melt pipe bushing barrel and melt pipe the outer barrel barrel Gap, sealing knot is provided between the tail end of the melt pipe bushing opening and the barrel of head end and melt pipe outer barrel barrel Structure, the head end and tail end of the opening of the melt pipe bushing are sealed and installed with head end filter and tail end filtering dress respectively Put；It is provided with bumps in the inner wall surface that melt pipe bushing is in contact with polymer melt to prevent adhesion mechanism, the bumps are anti- Adhesion structure is equally distributed depression and projection.

Preferably, the depression in the concavo-convex anti-adhesion structure and raised spaced it is uniformly distributed；Raised surface area For 0.5-2 square millimeters, the surface area of depression is 1-3 square millimeters.

Preferably, circumferentially arranged with ring-shaped groove, the tail end on the barrel close to the melt pipe bushing tail end Filter is arranged in ring-shaped groove.

Preferably, the barrel of the melt pipe bushing is protruded in the edge extension of the melt pipe bushing head end.

Preferably, the tail end filter case melt pipe bushing sunken inside of the melt pipe bushing.

Preferably, the barrel of melt pipe outer barrel extends radially outward to form the first protuberance, the sealing structure bag Include the annular groove being circumferentially disposed on the melt pipe outer tube inner wall, the barrel footpath of the melt pipe bushing head end The second protuberance is formed to stretching out, second protuberance is corresponding with the annular groove, and first protuberance connects Acting flange, the head end filter is between the melt pipe outer barrel, melt pipe bushing and flange.

Preferably, the sealing surface of the flange is provided with water wave line.

Preferably, the head end filter and tail end filter are metal filter screen.

Beneficial effects of the present invention：

A kind of low adhesion spinning melt pipeline of the present invention, the melt pipe includes melt pipe outer barrel and melt pipe serves as a contrast Set, melt pipe bushing are located at melt pipe outer barrel.Compared with the melt pipe in traditional fused spinning assembling parts, have Advantages below：Concavo-convex anti-sticking link is both provided with the surface of the part being in contact with molten polymer of melt pipe bushing Structure, it is possible to achieve anti-adhesive attraction of the polymer melt in filament spinning component；The prevent adhesion mechanism of action of mechanism of the bumps is：It is recessed Convex anti-adhesion structure includes sunk part and bossing, and bossing is higher by the setting of parts surface surface, utilizes point and point Between supporting role reduce directly contacting between highly viscous polymer melt and parts surface, and melted in HTHP Gas suspension effect is formed in the presence of body, plays and is prevented adhesion from separate type；Sunk structure plays a part of accommodating levitation gas, Cooperated with bossing；Raised surface area is 0.5-2 square millimeters, and the surface area of depression is 1-3 square millimeters, preferably Ground, raised surface area are 1 square millimeter, and the surface area of depression is 2 square millimeters, and sunk part is connected with lug boss branch point Accurate cellular protection grid is formed, parts surface and polymer melt are separated, increase the effect to prevent adhesion.Lug boss Point and sunk part area it is unsuitable excessive, if area is excessive, good preventing adhesiving effect can not be played, itself and polymerization The situation that thing melt is directly in contact with parts surface is without two；Area both it is also unsuitable too small, if area is too small, its Estimated preventing adhesiving effect can not be played, and difficulty of processing also can be very big.Concavo-convex anti-adhesion structure can prepare spinning group Apply on these parts respectively during the various pieces of part, can use the direct note of sark for the mechanism that prevented adhesion with bumps Take the form on the surface of part to carry out, can also be carried out in the form of precision lathe processing, its specific processing method is Conventional parts machining means of the prior art, are no longer described herein.

Brief description of the drawings

Fig. 1 is the low adhesion spinning melt piping schematic of the present invention.

Reference：

1 --- melt pipe outer barrel；

2 --- melt pipe bushing；

3 --- gap；

4 --- head end filter；

5 --- tail end filter；

6 --- ring-shaped groove；

7 --- the first protuberance；

8 --- annular groove；

9 --- the second protuberance；

10 --- flange.

Embodiment

Below in conjunction with specific embodiment and accompanying drawing, the present invention is described in detail.

A kind of low adhesion spinning melt pipeline, the melt pipe include melt pipe outer barrel 1 and melt pipe bushing 2, Melt pipe bushing 2 is located inside melt pipe outer barrel 1；The melt pipe outer barrel 1 and melt pipe bushing 2 are respectively provided with opening Head end and tail end, inner chamber, the barrel of melt pipe bushing 2 and melt pipe outer barrel 1 are formed in the melt pipe bushing 2 Gap 3 is left between barrel, the tail end and the barrel of head end and the barrel of melt pipe outer barrel 1 that the melt pipe bushing 2 is open Between be provided with sealing structure, the head end and tail end of the opening of the melt pipe bushing 2 are sealed and installed with head end filtering dress respectively Put 4 and tail end filter 5；It is provided with the inner wall surface that melt pipe bushing 2 is in contact with polymer melt concavo-convex anti- Adhesion mechanism, the concavo-convex anti-adhesion structure are equally distributed depression and projection.

Concavo-convex anti-sticking link is both provided with the surface of the part being in contact with molten polymer of melt pipe bushing Structure, it is possible to achieve anti-adhesive attraction of the polymer melt in filament spinning component；The prevent adhesion mechanism of action of mechanism of the bumps is：It is recessed Convex anti-adhesion structure includes sunk part and bossing, and bossing is higher by the setting of parts surface surface, utilizes point and point Between supporting role reduce directly contacting between highly viscous polymer melt and parts surface, and melted in HTHP Gas suspension effect is formed in the presence of body, plays and is prevented adhesion from separate type；Sunk structure plays a part of accommodating levitation gas, Cooperated with bossing；Raised surface area is 0.5-2 square millimeters, and the surface area of depression is 1-3 square millimeters, preferably Ground, raised surface area are 1 square millimeter, and the surface area of depression is 2 square millimeters, and sunk part is connected with lug boss branch point Accurate cellular protection grid is formed, parts surface and polymer melt are separated, increase the effect to prevent adhesion.Lug boss Point and sunk part area it is unsuitable excessive, if area is excessive, good preventing adhesiving effect can not be played, itself and polymerization The situation that thing melt is directly in contact with parts surface is without two；Area both it is also unsuitable too small, if area is too small, its Estimated preventing adhesiving effect can not be played, and difficulty of processing also can be very big.Concavo-convex anti-adhesion structure can prepare spinning group Apply on these parts respectively during the various pieces of part, can use the direct note of sark for the mechanism that prevented adhesion with bumps Take the form on the surface of part to carry out, can also be carried out in the form of precision lathe processing, its specific processing method is Conventional parts machining means of the prior art.Further, since in melt pipe bushing barrel and melt pipe outer barrel cylinder Gap is left between wall, can accommodate and receive the melt pipe bushing deformation brought due to high temperature when flowing through high-temperature fusant Problem so that the process of spinning is more smooth.

Wherein, the depression in the concavo-convex anti-adhesion structure and raised spaced it is uniformly distributed；Raised surface area is 0.5-2 square millimeters, the surface area of depression is 1-3 square millimeters.

For the ease of installing tail end filter, circumferentially set on the barrel close to the tail end of melt pipe bushing 2 There is ring-shaped groove 6, the tail end filter 5 is arranged on 6 in ring-shaped groove.

The barrel of the melt pipe bushing is protruded in the edge extension of the head end of melt pipe bushing 2, melt pipe bushing Tail end filter case melt pipe bushing sunken inside.

For the ease of installing head end filter, the barrel of melt pipe outer barrel extends radially outward to form the first protrusion Portion 7, the sealing structure include the annular groove 8 being circumferentially disposed on the inwall of melt pipe outer barrel 1, the melt The barrel of the head end of pipe liner 2 extends radially outwardly to form the second protuberance 9, second protuberance 9 and the annular groove 8 Corresponding, the adpting flange 10 of the first protuberance 7, the head end filter 4 is located at the melt pipe outer barrel 1, melt Between pipe liner 2 and flange 10, the sealing surface of flange 10 is provided with water wave line.

According to being actually needed, head end filter 4 and tail end filter 5 are metal filter screen.

Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than the present invention is protected The limitation of scope is protected, although being explained with reference to preferred embodiment to the present invention, one of ordinary skill in the art should Work as understanding, technical scheme can be modified or equivalent substitution, without departing from the reality of technical solution of the present invention Matter and scope.

Claims (8)

1. a kind of low adhesion spinning melt pipeline, it is characterised in that the melt pipe includes melt pipe outer barrel and melt pipe Road bushing, melt pipe bushing are located at melt pipe outer barrel；The melt pipe outer barrel and melt pipe bushing are respectively provided with The head end and tail end of opening, form inner chamber in the melt pipe bushing, the melt pipe bushing barrel with outside melt pipe Leave gap between cylinder barrel, the tail end of the melt pipe bushing opening and the barrel of head end and melt pipe outer barrel barrel it Between be provided with sealing structure, the head end and tail end of the opening of the melt pipe bushing be sealed and installed with respectively head end filter and Tail end filter；Bumps are provided with the inner wall surface that melt pipe bushing is in contact with polymer melt to prevent adhesion machine Structure, the concavo-convex anti-adhesion structure are equally distributed depression and projection.

2. low adhesion spinning melt pipeline as claimed in claim 1, it is characterised in that recessed in the concavo-convex anti-adhesion structure Fall into and raised spaced be uniformly distributed；Raised surface area is 0.5-2 square millimeters, and the surface area of depression is 1-3 squares of milli Rice.

3. low adhesion spinning melt pipeline according to claim 2, it is characterised in that close to the melt pipe bushing It is arranged on the barrel of tail end circumferentially arranged with ring-shaped groove, the tail end filter in ring-shaped groove.

4. low adhesion spinning melt pipeline according to claim 3, it is characterised in that the melt pipe bushing head end The barrel of the melt pipe bushing is protruded in edge extension.

5. low adhesion spinning melt pipeline according to claim 4, it is characterised in that the tail end of the melt pipe bushing Filter case melt pipe bushing sunken inside.

6. low adhesion spinning melt pipeline according to claim 5, it is characterised in that the barrel of melt pipe outer barrel is along footpath The first protuberance is formed to stretching out, the sealing structure includes being circumferentially disposed on the melt pipe outer tube inner wall Annular groove, the barrel of the melt pipe bushing head end extend radially outwardly to form the second protuberance, second protuberance Corresponding with the annular groove, the first protuberance adpting flange, the head end filter is located at the melt pipe Between outer barrel, melt pipe bushing and flange.

7. low adhesion spinning melt pipeline according to claim 6, it is characterised in that the sealing surface of the flange is provided with Water wave line.

8. low adhesion spinning melt pipeline according to claim 7, it is characterised in that the head end filter and tail end Filter is metal filter screen.