CN100455425C - Die for producing viscoelastic strands - Google Patents

Die for producing viscoelastic strands Download PDF

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Publication number
CN100455425C
CN100455425C CNB200480012141XA CN200480012141A CN100455425C CN 100455425 C CN100455425 C CN 100455425C CN B200480012141X A CNB200480012141X A CN B200480012141XA CN 200480012141 A CN200480012141 A CN 200480012141A CN 100455425 C CN100455425 C CN 100455425C
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CN
China
Prior art keywords
spray nozzle
nozzle device
nozzle passage
visco
throughput direction
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Expired - Fee Related
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CNB200480012141XA
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Chinese (zh)
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CN1784298A (en
Inventor
B·奥利弗
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Gebr RUEHLER AG
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Gebr RUEHLER AG
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Publication of CN1784298A publication Critical patent/CN1784298A/en
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    • A—HUMAN NECESSITIES
    • A21—BAKING; EDIBLE DOUGHS
    • A21C—MACHINES OR EQUIPMENT FOR MAKING OR PROCESSING DOUGHS; HANDLING BAKED ARTICLES MADE FROM DOUGH
    • A21C11/00—Other machines for forming the dough into its final shape before cooking or baking
    • A21C11/16—Extruding machines
    • 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
    • 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
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • 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
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/345—Extrusion nozzles comprising two or more adjacently arranged ports, for simultaneously extruding multiple strands, e.g. for pelletising
    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/695—Flow dividers, e.g. breaker plates

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Food Science & Technology (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing And Processing Devices For Dough (AREA)
  • Nozzles (AREA)

Abstract

The invention relates to a die device (1) for shaping viscoelastic strands, in particular made of polymers, pastes, etc. The inventive device comprises several similar and parallel nozzle channels (2), each of them extending along an axial direction of the paste transfer (F) to said die device (1). According to said invention, an output area gradually widens along the axial transfer direction (F) on the length LA of the internal area of the nozzle channel toward an output orifice.

Description

The spray nozzle device (outlet expansion) that is used for the viscoelastic material
Technical field
The present invention relates to a kind of spray nozzle device and method that is used for the viscoelastic material.
Background technology
Become known for the spray nozzle device of viscoelastic material, especially for extruded polymer, pastel etc.Usually spray nozzle device is furnished with a plurality of same nozzle passages that are set parallel to each other, they pass nozzle and extend to each one outlet perforate from each inlet drilling, wherein each nozzle passage has an entrance area along the axial throughput direction of material respectively in the upstream of nozzle passage, has an exit region in the downstream of nozzle passage.The setting adjacent one another are of each inlet drilling.
The viscoelastic material for example when polymer, pastel material be deformed moulding.But forming process needs flow of matter.Material also may form the crack at ad-hoc location.Because the material stress of machinery can appear in the elastic characteristic of visco-elastic material in this visco-elastic material when moulding and when forming the crack, it can exist in the material of moulding.This will cause the obvious spontaneous distortion that adds in the material of moulding after forming process.In this regard, people are commonly referred to " shape memory ", allow the people produce such impression because result from the mechanical stress of the material of former, and promptly it " is remembered " shape in the past and wants to get back to this shape.Carrying out pastel by means of injector arrangement or when polymer-extruded, above-mentioned situation can cause the bar of extruding in each nozzle passage to take place to curl.Stress can be introduced in the material, on the one hand be with separating substances be assigned to different nozzle passages in the time, be on the other hand when material extends (Dehnung) in nozzle passage.Thereby bar is asymmetric to have a worst influence because it is with respect to extruding of being produced owing to the separation of material and distribution are created in the stress in the material.Yet because material stress and the caused trend of extruding the direction of bar change in nozzle passage that makes can produce asymmetric wall friction, it has further strengthened material stress under a stable condition.Possible is that such visco-elastic material is extruded bar and tended to take place above-mentioned curling at it when spray nozzle device comes out.
In addition, when the viscoelastic material, must on spray nozzle device, use more relatively energy or high pressure differential, so that separate substance, be transported in the forming nozzle passage and at last it exerted pressure and make it pass through the forming nozzle passage, material is extended during this period.In other words, the common spray nozzle device that is used for the visco-elastic material moulding has bigger nozzle resistance for this class material.Problem is arranged for pasty mass especially, because different, reduce the resistance of spray nozzle device and reduce to introduce stress in the material even have only limited possibility to rise here by the temperature in the local at least large-area spray nozzle device that also only is confined to material surface with traditional polymer such as polyester or rubber.
Summary of the invention
The objective of the invention is to, reduce this class material stress in visco-elastic material when visco-elastic material is molded into the material bar, and reduce needed energy consumption and pressure differential when extruding, promptly reduce nozzle resistance.
Above-mentioned purpose reaches like this in the described spray nozzle device of beginning according to the present invention, that is, exit region from the nozzle passage interior zone to outlet perforate direction in a length L AGo up along axial throughput direction F expansion.
When visco-elastic material when for example polymer or pastel etc. arrive the nozzle passage of spray nozzle device of the present invention, the product stream that is divided into a plurality of shuntings is extruded by a plurality of nozzle passages.When material enters nozzle passage and in each entrance area in material inside stress appears during moulding.The material stress that does not also have to discharge that forms during extending during the cutting on the cutting edge and/or in entrance area has almost completely discharged in the exit region of expansion.Therefore many little product bars leave nozzle passage almost unstressedly under this nozzle geometry.The exit region of expansion not only makes product discharge in the axial direction but also diametrically.Can avoid the groove line (sharkskin) on the surface of the viscoplasticity product bar that from nozzle passage, comes out thus.
Advantageously, exit region from the nozzle passage interior zone to outlet perforate direction in a length L AGo up along the axial bell expansion of throughput direction F, wherein the extended corner of the outlet extension of preferably measuring between the inwall in axial throughput direction and channel outlet zone increases constantly along axial throughput direction F.Particularly the recruitment of extended corner increases constantly along axial throughput direction F, wherein for example extended corner from be increased to 90 ° in the nozzle body downstream 0 ° of nozzle interior.In this case, described extension can be circular arc, its radius of curvature R in longitudinal sectional view ARadius R greater than the nozzle passage interior zone KThe exit region of this crooked expansion by a vertical tangent line from the interior zone of nozzle passage carry out the transition to continuously of exit region downstream that tilt to extend with respect to vertical direction, at the lower horizontal tangent line of extreme case, substituted the edge of traditional outlet perforate.
In a special embodiment, the nozzle passage inwall at exit region along axial throughput direction in a length L ROn have a surface roughness higher than the other parts of nozzle passage inwall.Can influence product surface targetedly by roughness and/or the material of selecting rough region thus.
The axial length L of rough region RPreferably less than the axial length L that exports the extension A, less than the axial length L of inlet extension EAnd less than the axial length L of cutting edge S
Yet also preferably, on the very big axial regional area of nozzle passage, a plurality of continuous successively rough region are set, its V that satisfies condition respectively F＞L R/ T RELAXCan influence in this way that wall adheres to and wall slip (adhering to/the slippage effect) between interaction.Pass through length L RCoarse axial walls section periodicity or spatial frequency and can in the unit interval, on purpose produce more wall by flowing velocity and tear, promptly produce high-frequency adhering to/slippage effect by coarse relatively the forcing that replaces mutually with relative level and smooth wall section " artificially ".This has following advantage,, can not produce too high material stress that is, and therefore produces very little crack or do not produce the crack on product.
In a particularly preferred form of implementation, between the inlet drilling of two vicinities, be provided with one respectively at the upstream extremity of nozzle passage and be parallel to the separates walls that axial throughput direction F extends, it has a cutting edge at its upstream end.
When viscoelastic material when for example polymer or pastel etc. arrive on the spray nozzle device of the present invention, the product stream of introducing along throughput direction F in housing is divided into a plurality of shuntings, and one of each in the middle of them flows out by each nozzle passage respectively.The product stream that is incorporated on the spray nozzle device is cut into a plurality of shuntings by sharp-pointed cutting edge when it enters a plurality of nozzle passage.Because each cutting edge has only very little, opposite with throughput direction F working face on product, so act on partly on the viscoplasticity product of arrival in very large power on the cutting edge.Therefore produce the shearing force of the cutting products of a concentration of local along cutting edge.But be incorporated into visco-elastic material on the cutting edge before the cutting edge place tears, it is out of shape until fracture strength that reaches it and extension at break, has wherein stored potential energy in visco-elastic material, and potential energy is continued to be delivered in a plurality of shuntings.On the whole, by means of cutting edge visco-elastic material is separated be assigned to different nozzle passages in the time stress that is incorporated in the material be significantly less than the stress that does not have in the conventional spout of the sharp-pointed cutting edge device, when thereby the visco-elastic material that will introduce spray nozzle device of the present invention is divided into more a plurality of itemize, have content still less to enter in the shape memory of visco-elastic material, the deformation tendency of product bar when leaving nozzle passage (curl etc.) reduced and nozzle resistance significantly reduces thus.This favourable particular significant effect in the noodles spray nozzle device particularly.
Preferably the zone that is provided with in the upstream of the entrance area of each phase neighbor entry is parallel to the separates walls that axial throughput direction extends fully and surrounds, and its upstream extremity constitutes cutting edge respectively.The material that enters thus in each nozzle passage is almost cut everywhere, and it also must be separated in this position, thereby have only especially little stress to be introduced in the material.
Cutting edge can become to be different from 90 ° angle with the axial throughput direction F of material.It for example can become roughly, and 30 ° to 60 ° angle lapping tiltedly extends with the material throughput direction.Yet acute angle preferably.Sharp more with the throughput direction angulation, the zone length L that measures along throughput direction so SJust big more, the cutting of material is perpendicular to throughput direction in the radial direction, for example from the radial outside to the radially inner side in this zone.The flow region of the radial outside of material at first is cut, and the flow region of radially inner side was cut afterwards.And the stress in cutting process introducing material has just been eliminated in the zone of radial outside if having time.Therefore introduce the situation (simple " punch die " principle) that the stress in the material that is distributed in the nozzle passage extends perpendicular to flow direction less than cutting edge on the whole by this cutting process.
Also advantageously, the entrance area of nozzle passage internally the zone towards inlet drilling direction and axial throughput direction F on the contrary along a length L EExpansion, the wherein scope of extended corner between 5 ° to 45 ° of the inlet extension of between axial throughput direction and feeder connection zone inwall, measuring, the preferably scope between 8 ° to 25 °.The zone is when inlet drilling is steady state value internally when extended corner, and promptly when having the inlet extension of taper, manufacturing process is simple especially.Even when material so that relatively very high speed is passed spray nozzle device, also can obtain the extension of " slow gentle ", i.e. enough slow extension for visco-elastic material, thereby the relaxation time of visco-elastic material is less than the extension time of material in the extension that enters the mouth.
What meet purpose is that spray nozzle device constitutes like this, the cross section that nozzle passage has a circle along its whole length.Therefore have identical wall boundary condition everywhere, this causes the unified extension of symmetry as far as possible.
A kind of cramped construction of spray nozzle device is characterised in that the axial length in feeder connection zone accounts for 50% to 80% of nozzle passage total length.
The inwall of nozzle passage is made by polytetrafluoroethylene (PTFE) or similar material in regional area at least, and reduces visco-elastic material adhering to and sliding friction on inwall.
Be used for the extrusion method of described visco-elastic material, especially for extruded polymer, pastel or the like, use the said nozzle device, visco-elastic material is extruded under the differential pressure Δ p effect between spray nozzle device upstream extremity and the downstream passes through spray nozzle device.According to the present invention, selection pressure drop Δ p like this makes the flowing velocity V of visco-elastic material along throughput direction F FV satisfies condition in each axial regional area of spray nozzle device F＜L/T RELAX, in described axial regional area, carry out the needed a part of material forming process of extrusion at least, wherein T RELAXBe the relaxation time of visco-elastic material, L (=L S, L E, L A) be the axial length of each axial regional area of spray nozzle device.
Guaranteed that thus each forming step of the needed visco-elastic material of extrusion is for example along a length L SCutting on cutting edge, along the inlet extension a length L EExtension and along the outlet extension length L AFinal release, thereby material when they leave the end of spray nozzle device of the present invention almost without any stress.
The coarse axial regional area of mentioning for optimum utilization is above-mentioned, visco-elastic material is along the flowing velocity V of throughput direction F in the method for the invention FLength L with the coarse axial regional area of spray nozzle device RCoordinate the feasible V that satisfies condition like this F＞L R/ T RELAX, T wherein RELAXBe the relaxation time of visco-elastic material, L RIt is the axial length of coarse regional area.As mentioned above, can influence product surface targetedly by roughness and/or the material of selecting rough region thus.
Description of drawings
Other advantage of the present invention, feature and use possibility are drawn by following explanation, but are not limited to the preferred embodiment in the accompanying drawing.Wherein:
The cutaway view of the product throughput direction F vertically of Fig. 1 spray nozzle device of the present invention;
The vertical view along product throughput direction F of the spray nozzle device of the present invention of Fig. 2 Fig. 1;
The cutaway view along product throughput direction F of Fig. 3 nozzle passage of the present invention;
The cutaway view of the product throughput direction F vertically of Fig. 4 another one nozzle passage of the present invention;
The cutaway view of the product throughput direction F vertically of the nozzle passage of Fig. 5 prior art;
The cutaway view of the product throughput direction F vertically of the another one nozzle passage of Fig. 6 prior art.
The specific embodiment
Fig. 1 is a cutaway view especially for the product throughput direction F vertically of the spray nozzle device 1 of the pastel in the noodle production of the present invention.Spray nozzle device 1 (see figure 2) that has four nozzle passages 2 altogether is arranged in the columniform housing 7.The upstream extremity of each nozzle passage 2 has an inlet drilling 3, and the downstream of each nozzle passage 2 has an outlet perforate 4.The tapered expansion of entrance area 2a in abutting connection with inlet drilling 3 of each nozzle passage 2, and that exit region 2c constitutes is cylindrical.Spread angle alpha is approximately 10-20 ° of (see figure 3).Upstream extremity at spray nozzle device 1 has four separates walls 5 (see figure 2)s, and it is parallel to that axial throughput direction F extends and the zone of inlet drilling 3 upstreams is divided into four regional areas, and it lays respectively at the upstream of an inlet drilling 3.The edge of throughput direction F directed in opposite separates walls 5 and axial constitutes the cutting edge 5a that tilts to extend respectively, and its inwall from housing 7 not only radially inwardly but also at throughput direction F extends.
Fig. 2 is the vertical view along product throughput direction F (see figure 1) of the spray nozzle device of the present invention of Fig. 1.Can see four nozzle passage 2 and each separates walls 5 that extend radially inwardly from the cylindrical housings 7s that have the entrance area 2a of conical expansion respectively, its zone with spray nozzle device 1 top is divided into four regional areas.Four sharp-pointed cutting edge 5a and throughput direction F direction are extended on the contrary obliquely.
If visco-elastic material for example polymer or pastel etc. arrives spray nozzle device 1 of the present invention, as schematically illustrating with flow profile V (r) among Fig. 1, the product stream of introducing in the housing 7 along throughput direction F is divided into four shuntings so, and each in them is by an outflow in four nozzle passages 2.The product stream of introducing spray nozzle device 1 was cut into four shuntings by sharp-pointed cutting edge 5a before entering four nozzle passages 2.Because each cutting edge 5a has only very little, opposite with throughput direction F working face on product, so very large power of cutting edge 5a local action is to the viscoplasticity product that appears on the cutting edge 5a.Can produce the shearing force of the cutting products of a concentration of local along cutting edge 5a.But visco-elastic material is before cutting edge 5a place tears, its distortion is until the fracture strength that reaches it, wherein in visco-elastic material, stored potential energy, potential energy is continued to be delivered in four shuntings, and before material enters each nozzle passage 2, promptly visco-elastic material continued distortion and moulding generation in four product shuntings before, potential energy part in these four shuntings discharged.When material enters nozzle passage 2 and in each entrance area 2a in material inside stress appears also during moulding.But this stress ratio little on cutting edge 5a and do not cause product to be torn.
Do not have cutting edge and do not have for the about 10-20 of extended corner of the present invention ° the spray nozzle device of conical expansion portion with respect to traditional, the design of the cutting edge 5a of separates walls 5 of the present invention and the entrance area 2a of nozzle passage 2 has reduced by the stress intensity in spray nozzle device 1 material that carry and moulding in spray nozzle device of the present invention, and has reduced the flow resistance of spray nozzle device 1.
In spray nozzle device 1 of the present invention, the forming process that links together with the foundation of material stress, become four little product bars from a big product bar realizes by two steps basically.In first step, big product bar is cut into four little itemizes at cutting edge 5a place.In second step, four itemizes extend in the entrance area 2a of taper.And then afterwards and before, a local at least release (stress reduces and potential energy reduces) when slipping over separates walls 5, material takes place in material in second step (in entrance area 2a, extending) at first step (cutting) at cutting edge 5a place.When product extends in the 2a of conical entrance zone, produced material stress simultaneously, in the 2c of the cylindrical outlet zone of adjacency a local at least release takes place then again.Therefore the visco-elastic material that is divided into four little product bars has not left the outlet perforate 4 of nozzle passage 2 with almost having stress, thereby the product bar of four discharges is almost without any the distortion of being worth mentioning (for example curling).Because tear owing to the reason of cutting edge under very little product shear stress product has taken place, so the flow resistance of spray nozzle device of the present invention 1 has obviously reduced.
The operation that spray nozzle device 1 of the present invention can realize having less pressure differential with respect to traditional spray nozzle device, promptly less differential pressure in the product of spray nozzle device 1, and in the product itemize of discharging almost completely " elimination " shape memory.
Fig. 3 is the cutaway view along product throughput direction F of the nozzle passage of the present invention 2 of a pastel that is used for noodle production equally.This nozzle passage 2 can be used for replacing the nozzle passage 2 shown in Fig. 1.The cylindrical outlet of the nozzle passage 2 of alternate figures 1 zone 2c at first connects a relatively short columniform interior zone 2b and the exit region 2c that then is connected a bell expansion at the downstream area of entrance area 2a.Exit region 2c is by an edge (see figure 1) that replaces exporting perforate 4 from the vertical tangent line of the interior zone 2a of nozzle passage 2 to the continuous transition of the bending of a horizontal tangent of the downstream of exit region 2c.The radius of curvature R of outlet extension ADirection towards outlet 4 reduces continuously, promptly has a bell extension that reduces gradually towards opening 4 direction bendings.
When as shown in Figure 1, visco-elastic material is when for example polymer or pastel etc. arrive on the nozzle passage 2 of spray nozzle device 1 of the present invention, and the product stream that is divided into four shuntings is extruded by four nozzle passages 2 (seeing Fig. 1,2).Stress appears in material during moulding when material enters nozzle passage 2 and in entrance area 2a.In the exit region 2c of expansion, almost completely discharging this moment during the first step (in the cutting on the cutting edge 5a) and/or at the material stress that does not also have to discharge that forms during second step (extension in entrance area 2a).Therefore, under this nozzle geometry, four little product bars leave nozzle passage 2 almost unstressedly.The special advantage of the exit region 2c of expansion is that it makes product not only discharge in the axial direction but also diametrically.Can avoid the groove line (" sharkskin ") on the surface of the viscoplasticity product bar of outflow from nozzle passage 2 thus, (see figure 1) almost always occurs in the outlet perforate 4 of its sharp edges on the sort of columniform exit region 2c.
At the axial length of the release areas shown in Fig. 1 and Fig. 3 basically by the axial length L of cutting edge 5a SAnd the axial length L of exit region 2c AConstitute, described axial length and visco-elastic material are along the maximum fluidity speed V of product throughput direction F FPreferred like this and the relaxation time T of product material RELAXCoordinate, that is, make material when passing each release areas, have time enough and eliminate the stress that forms therein before this, i.e. V F* T RELAX＜L SOr V F* T RELAX＜L A
When the nozzle passage 2 that will have conical entrance zone 2a among Fig. 3 and bell exit region 2c is applied in the spray nozzle device 1 that is equipped with cutting edge 5a, not only can realize product along the less differential pressure of spray nozzle device 1 and the volume-shape memory of " elimination " the product itemize of discharging almost completely, and can " eliminate " surface-shape memory of this product bar.
The another one advantage of the bell exit region 2c of nozzle passage is, it can realize gently carrying out the transition to " the flowing " outside, that have constant VELOCITY DISTRIBUTION that is positioned at nozzle passage 2, i.e. Yun Dong bar from flowing of the VELOCITY DISTRIBUTION inside that is positioned at nozzle passage 2, that have parabolic shape.This can prevent to form the crack on the surface of the bar of discharging from nozzle passage 2.
Fig. 4 be of the present invention one equally especially for the cutaway view of the product throughput direction F vertically of the nozzle passage 2 of the pastel in the noodle production.Entrance area 2a in abutting connection with the nozzle passage 2 of inlet drilling 3 is bell expansion, and exit region 2c is cylindrical formation.The radius of curvature R of inlet extension E3 places are minimum at inlet drilling, and increase along with the increase of hobbing depth along nozzle passage 2, so that tangentially carry out the transition to columniform exit region 2c.
Similar with bell exit region, the entrance area 2a of bell expansion helps treatment product mildly.By in the entrance area 2a of bell expansion, can avoiding causing usually the velocity jump in product crack to the soft acceleration of product, thus also realized nozzle passage 2 upstreams, flowing of having constant VELOCITY DISTRIBUTION gently carry out the transition to flowing of VELOCITY DISTRIBUTION inside, that have parabolic shape that is positioned at nozzle passage 2.
Fig. 5 is the cutaway view of product throughput direction F vertically of the nozzle passage 2 of prior art.This nozzle passage has constant radius R from its inlet 3 until its outlet 4 constitutes KCylindrical.
Fig. 6 is the cutaway view of product throughput direction F vertically of another nozzle passage 2 of prior art.Entrance area 2a has one than the much bigger spread angle alpha of the present invention and the length L of a much shorter E
List of numerals
Nozzle device 1
Nozzle passage 2
The entrance area 2a of nozzle passage
Zone, the inside 2b of nozzle passage
The exit region 2c of nozzle passage
The inlet drilling 3 of nozzle passage
The outlet perforate 4 of nozzle passage
Separates walls 5
Cutting edge 5a
Housing 7
Throughput direction F
The axial length L of cutting edge S
The axial length L of inlet extension E
The axial length L of outlet extension A
The radius of curvature R of nozzle passage cross section K
The radius of curvature R of inlet extension E
The radius of curvature R of outlet extension A
The flowing velocity V of visco-elastic material F
Spread angle alpha

Claims (19)

1. the spray nozzle device that is used for the viscoelastic material, has a housing (7), this housing be used to receive visco-elastic material and vertically throughput direction (F) pass nozzle (1) and carry visco-elastic material, zone in the top that is arranged in nozzle passage (2) receives described visco-elastic material, described nozzle passage (2) extends through nozzle (1) from an inlet drilling (3) to an outlet perforate (3), this nozzle passage (2) has an entrance area (2a) at nozzle passage (2) upstream extremity, one at nozzle passage (2) inner interior zone (2b) and the exit region (2c) in nozzle passage (2) downstream, all nozzle passages (2) are parallel to each other and pass nozzle (1) and have adjacent each inlet drilling (3) along the axial throughput direction (F) of described visco-elastic material, it is characterized in that:
In the zone that is positioned at nozzle passage (2) top, at least one separates walls (5) that extends radially inwardly from housing (7) is positioned between adjacent each inlet drilling (3), and this separates walls (5) has a cutting edge (5a) at its upstream end,
The exit region (2c) of nozzle passage (2) zone (2b) internally arrives outlet perforate (4) in a length L AGo up along axial throughput direction (F) expansion, and/or
Entrance area (2a) taper of nozzle passage (2) ground internally zone (2b) to inlet drilling (3) and axial throughput direction (F) on the contrary along a length L EExpansion.
2. spray nozzle device as claimed in claim 1 is characterized in that, exit region (2c) has the extended corner that increases along axial throughput direction (F).
3. spray nozzle device as claimed in claim 1 or 2 is characterized in that, the recruitment of extended corner continues to increase along axial throughput direction (F).
4. spray nozzle device as claimed in claim 3 is characterized in that, extended corner is from being increased to 90 ° in nozzle passage (2) downstream 0 ° of nozzle interior.
5. spray nozzle device as claimed in claim 4 is characterized in that described extension is circular arc in longitudinal sectional view.
6. spray nozzle device as claimed in claim 5 is characterized in that, the radius of curvature R of the circular arc of described extension ARadius R greater than nozzle passage (2) interior zone (2b) K
7. spray nozzle device as claimed in claim 1 is characterized in that, the inwall of nozzle passage (2) in exit region (2c) along axial throughput direction (F) in a length L ROn have a higher surface roughness of other parts than nozzle passage (2) inwall.
8. spray nozzle device as claimed in claim 7 is characterized in that, the axial length L of rough region RAxial length L less than exit region (2c) A, and less than the axial length L of entrance area (2a) E
9. spray nozzle device as claimed in claim 1, it is characterized in that, that be provided with and zone that link to each other with this entrance area is parallel to each separates walls (5) encirclement that axial throughput direction (F) extends fully in the upstream of the entrance area (2a) of each adjacent inlet drilling (3), and the upstream extremity of each separates walls (5) constitutes a cutting edge (5a) respectively.
10. spray nozzle device as claimed in claim 1 is characterized in that, cutting edge (5a) becomes an angle that is different from 90 ° with axial throughput direction (F).
11. spray nozzle device as claimed in claim 1 is characterized in that, entrance area (2a) has 5 ° to 45 ° extended corner.
12. spray nozzle device as claimed in claim 1 is characterized in that, the cross section that nozzle passage (2) has a circle along its whole length.
13. spray nozzle device as claimed in claim 1 is characterized in that, the axial length L of feeder connection zone (2) EAccount for 50% to 80% of nozzle passage total length.
14. spray nozzle device as claimed in claim 1 is characterized in that, the inwall of nozzle passage is made by polytetrafluoroethylene (PTFE) in regional area at least.
15. spray nozzle device as claimed in claim 1 is characterized in that, described visco-elastic material is extruded polymer or pastel.
16. spray nozzle device as claimed in claim 11 is characterized in that, entrance area (2a) has 8 ° to 25 ° extended corner.
17. be used for the method for viscoelastic material, use as the described spray nozzle device of one of claim 1 to 16 (1), wherein visco-elastic material is extruded by this spray nozzle device (1) by means of the effect of the differential pressure Δ p between spray nozzle device (1) upstream extremity and the downstream, it is characterized in that, selection pressure drop Δ p like this makes the flowing velocity V of visco-elastic material along throughput direction F FV satisfies condition in the interior zone of a nozzle passage (2) F＜L A/ T RELAX, T wherein RELAXBe the relaxation time of visco-elastic material, L AIt is the axial length of outlet extension.
18. method as claimed in claim 17 is characterized in that, visco-elastic material is along the flowing velocity V of throughput direction F FV satisfies condition in the interior zone of a nozzle passage (2) F＞L R/ T RELAX, T wherein RELAXBe the relaxation time of visco-elastic material, L RIt is the axial length of rough region.
19. spray nozzle device as claimed in claim 17 is characterized in that, described visco-elastic material is extruded polymer or pastel.
CNB200480012141XA 2003-05-05 2004-03-03 Die for producing viscoelastic strands Expired - Fee Related CN100455425C (en)

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DE10320073.8 2003-05-05
DE10320073A DE10320073A1 (en) 2003-05-05 2003-05-05 Strand forming nozzle for viscoelastic materials (outlet widening)

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DE102020204024B3 (en) * 2020-03-27 2021-01-07 Albert Handtmann Maschinenfabrik Gmbh & Co. Kg ASSEMBLY ASSEMBLY AND SYSTEM FOR THE PRODUCTION OF PASTY MOLDED PARTS
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WO2004098859A1 (en) 2004-11-18
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EP1620245A1 (en) 2006-02-01

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