EP4081386A1 - Extrudeuse monovis - Google Patents

Extrudeuse monovis

Info

Publication number
EP4081386A1
EP4081386A1 EP20801189.0A EP20801189A EP4081386A1 EP 4081386 A1 EP4081386 A1 EP 4081386A1 EP 20801189 A EP20801189 A EP 20801189A EP 4081386 A1 EP4081386 A1 EP 4081386A1
Authority
EP
European Patent Office
Prior art keywords
screw
cylinder
overflow
web
melt
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP20801189.0A
Other languages
German (de)
English (en)
Inventor
Markus Bornemann
Jürgen Hügelmeyer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Battenfeld Cincinnati Germany GmbH
Original Assignee
Battenfeld Cincinnati Germany GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Battenfeld Cincinnati Germany GmbH filed Critical Battenfeld Cincinnati Germany GmbH
Publication of EP4081386A1 publication Critical patent/EP4081386A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/114—Helically shaped stirrers, i.e. stirrers comprising a helically shaped band or helically shaped band sections
    • B01F27/1143—Helically shaped stirrers, i.e. stirrers comprising a helically shaped band or helically shaped band sections screw-shaped, e.g. worms
    • 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
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/397—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using a single screw
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/40—Mixing liquids with liquids; Emulsifying
    • B01F23/43—Mixing liquids with liquids; Emulsifying using driven stirrers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/40—Mixing liquids with liquids; Emulsifying
    • B01F23/47—Mixing liquids with liquids; Emulsifying involving high-viscosity liquids, e.g. asphalt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/40—Mixing liquids with liquids; Emulsifying
    • B01F23/48—Mixing liquids with liquids; Emulsifying characterised by the nature of the liquids
    • B01F23/482—Mixing liquids with liquids; Emulsifying characterised by the nature of the liquids using molten solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/19—Stirrers with two or more mixing elements mounted in sequence on the same axis
    • B01F27/191—Stirrers with two or more mixing elements mounted in sequence on the same axis with similar elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/72—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with helices or sections of helices
    • B01F27/724—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with helices or sections of helices with a single helix closely surrounded by a casing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/90—Heating or cooling systems
    • B01F35/92—Heating or cooling systems for heating the outside of the receptacle, e.g. heated jackets or burners
    • 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
    • B29C48/505—Screws
    • B29C48/52—Screws with an outer diameter varying along the longitudinal axis, e.g. for obtaining different thread clearance
    • 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
    • B29C48/505—Screws
    • B29C48/64—Screws with two or more threads
    • B29C48/66—Barrier threads, i.e. comprising primary and secondary threads whereby the secondary thread provides clearance to the barrel for material movement
    • 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
    • B29C48/68—Barrels or cylinders
    • B29C48/681—Barrels or cylinders for single screws
    • 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
    • B29C48/68—Barrels or cylinders
    • B29C48/685—Barrels or cylinders characterised by their inner surfaces, e.g. having grooves, projections or threads
    • B29C48/686—Barrels or cylinders characterised by their inner surfaces, e.g. having grooves, projections or threads having grooves or cavities
    • 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
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
    • B29C48/802—Heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/90—Heating or cooling systems
    • B01F2035/99—Heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/2805—Mixing plastics, polymer material ingredients, monomers or oligomers
    • 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
    • B29C48/505—Screws
    • B29C48/59—Screws characterised by details of the thread, i.e. the shape of a single thread of the material-feeding screw
    • B29C48/60—Thread tops

Definitions

  • Single-screw extruder for conveying and plasticizing a meltable material, in particular thermoplastic, in which a screw is rotatably held in a heated cylinder, the screw having a core and a helical main web which is at a distance from the inner wall of the cylinder and with which The cylinder and the core of the screw form a screw channel, the screw including a solids conveying zone, a transition zone, a melting zone and a melt conveying zone, depending on the changing physical state of the meltable material, the distance between the main web and the inner wall of the cylinder being in the area of the The transition and melting zone is selected in such a way that the melt is prevented from exceeding the main web.
  • the invention also includes a corresponding method.
  • barrier screw which is used in both plain and grooved barrel extruders. This concept goes back, among other things, to the patent DE 1207074 B.
  • a screw press for processing thermoplastics by conveying, plasticizing and mastifying with subsequent extrusion through an ejection opening is disclosed.
  • the screw press is equipped with a partly single-flight and partly double-flight screw, between whose screw flight circumference and the inner wall of the screw cylinder there is a flow gap and in which the material in its viscous end phase passes over the screw tip to the discharge opening
  • the second screw flight begins at the point where the material in the flow gap reaches its viscous end phase and the flow cross-section of the one groove between the adjacent screw flights of the two screw flights increases from zero to a maximum value at the front end of the screw from this point in the conveying direction, while the flow cross-section of the other groove, the only one in the area of the feed opening, decreases from the point in question in the conveying direction from the maximum value to zero at the front end of the screw.
  • the filter effect of the barrier screw caused by the gap prevents correspondingly large solid particles or agglomerates from reaching the end of the screw via the gap.
  • the energy input into the solids for melting takes place mainly through the heat-conducting contact of the solids bed with the heated cylinder.
  • the barrier web has a very efficient blocking effect against unmelted solids, it can happen that solids get over the barrier web under certain circumstances. This happens, for example, when grooved barrel extruders with high conveying and pressure build-up capacity in the feed zone, the melting capacity of the barrier is exceeded. In this case, even with a barrier gap that is smaller than the particle size of the solid starting material to be melted, a certain proportion of solids, deformed or already softened by the influence of pressure and temperature, can pass through the barrier. Unfortunately, this effect usually occurs at the end of the barrier, so that the solid may no longer be completely melted up to the end of the screw. In addition, it is usually a matter of material from the core of the compacted solid bed, which as a result the comparatively poor heat conduction properties of the material to be melted in the course of the barrier cannot be warmed sufficiently.
  • US 4128341 describes an approach to increasing the processing bandwidth for barrier screws by means of a more universal plasticizing concept.
  • an extruder screw with intake, melting and melt conveyor area with at least three spiralför shaped channels that partially overlap in a double-thread area and are separated from each other by overflow bars with different gap widths to the cylinder.
  • the first channel, the solids channel extends into the melting area of the screw.
  • the second channel, in which the solid and melt are parallel to one another, extends from the beginning to the end of the melting area and the melt channel, which is open to the end, extends from the beginning of the melt conveying area to the end of the screw.
  • the first overflow web has a gap width to the cylinder, which also allows solids to flow over, whereas only melt can flow over the second overflow web with a smaller gap width.
  • a typical example of melting concepts based on mixing solid and melt are the so-called polygonal screw concepts.
  • the motivation in DE 10253225 B4, for example, is to increase the throughput of such screws.
  • We disclose here a single-screw extruder with a plurality of overflow webs which overlap in the axial direction and which are correspondingly offset from the main web.
  • the solid material crosses over a number of times over comparatively long barrier webs while still having a short overall length with correspondingly good mixing properties.
  • the object of the invention is to further develop a single-screw extruder with an extruder screw in such a way that even more effective melting is possible compared to the prior art, as well as to offer a related method, with more effective melting, for example, higher plasticizing and thus output with otherwise the same structural and procedural boundary conditions.
  • the solution to the problem with regard to the device is characterized in connection with the preamble of claim 1 in that the area from the transition zone to the melting zone has at least two consecutive, non-overlapping barrier sections Overflow web is present, which from the by the screw rotation hung defined active flank of the main web begins and ends at the passive flank of the main web, whereby at least three separate channels are formed, which are connected to each other only by the gap that forms, due to a distance between the overflow web and the inner wall of the cylinder, that the Distances of the overflow webs to the inner wall of the cylinder in each barrier section are greater than the distance of the main web to the inner wall in order to allow a material transfer of solids and / or melt and that the inner wall of the cylinder at least in the area of the first barrier section at least is partially provided either with at least one cylinder groove running parallel to the longitudinal axis of the screw or a helically running cylinder groove.
  • the entire plasticizing process takes place in several stages, the material no longer being completely plasticized within a single, "long" barrier zone, but gradually in several successive barrier zones, until the melting is ultimately only completed within the last barrier zone up to the desired degree of melting. Accordingly, the choice of the spacing between the overflow webs and the inner wall of the cylinder allows solids to flow over. This applies in particular to the first barrier zone, in which a high proportion of solids should pass through the barrier by choosing a comparatively large barrier gap. In this way, the bed of solids is broken up early and, due to the stress when crossing the barrier web, it reaches the next screw channel “preheated”.
  • the overlap of the barrier webs ensures that the first end of the channel, in which there is still a compacted bed of solids, is sufficiently spaced from the screw tip and that there is sufficient dwell time for further mixing and further dispersed melting the solid particle is present before the solid-melt mixture crosses the next barrier web.
  • the cylinder nuts provided according to the invention still have an advantageous pumping effect, even if the pressure reduction in the subsequent sections does not occur as pronounced as in the first section.
  • the distance between the last overflow web and the inner wall of the cylinder is selected such that only melt can be conveyed via the last overflow web. This ensures the complete melting of the material within the last barrier section.
  • the barrier section or sections following the first barrier section advantageously follow one another directly, which inevitably leads to a maximization of the melting effects with the same catches of Transition and melting zone leads.
  • the available screw length can thus be used optimally for melting the material.
  • the distances between the overflow webs and the inner wall of the cylinder of the overflow webs following the first overflow web be continuously smaller in order to further reduce the size of the remaining solid agglomerates or particles and continue to ensure the effectiveness of the melting effects. It also makes sense that the following barrier section or sections become continuously shorter up to the last one, in order to do justice to the proportion of solids, which decreases in the course of the transition and melting zone.
  • the cylinder-side web surface of one or more overflow webs is beveled completely or partially over the web width.
  • the overflow web can also have sections beveled ask in the axial direction of the respective Barriereab.
  • a narrowing, conical gap between the overflow web and the inner wall of the cylinder is formed in the overflow direction of the material, which facilitates the entry of the solid-melt mixture into the gap.
  • this also increases the effect of stretching effects, which also contribute to a reduction in the size of softened solids and thus to gentle melting.
  • the distance to the inner wall of the cylinder can also be changed continuously or within several steps within one or more barrier sections in the axial direction of the screw, which also includes the formation of narrow slots, or within one or more barrier sections the web width of the overflow web can be continuous or can be varied within several levels.
  • the melting process can be controlled even more flexibly over the length of the screw if the screw has several parallel main webs or the number of main webs varies from one barrier section to the next, since the intensity of the melting processes increases with the number of main webs and thus also the overflow webs goes here. For example, with 2 main webs, there would also be 2 overflow webs within a barrier section, in which case an overflow web would then begin on the active flank of one main web and end on the passive flank of the other main web. With regard to the number of main webs, it is generally not recommended to choose this too high, since a high number of main webs, such as, for example, with a shear part, which is usually used at the end of the screw, too much shear would be introduced into the melting material .
  • the single-screw extruder according to the invention is particularly advantageous if the inner wall in the area of the intake or solids conveying zone is additionally provided with at least one helical or parallel groove to the longitudinal axis. In this way, the pressure required to overcome several overflow webs can be built up and thus stable conveyance in combination with a correspondingly high throughput can be ensured. Of course, it is natural to continue the grooves in the area of the intake or solids conveying zone continuously into the barrier sections.
  • the first barrier section should begin as early as possible, if possible in the transition zone.
  • This zone is the zone in which the material is at least in the edge zones of the screw channel is already heated above the solids conveying zone temperature, but has not yet exceeded the melt-out temperature. Compared with the melting zone, this zone is therefore very short. Since, depending on the type, the preheated material has already at least partially softened, it can be conveyed via the first overflow web without any problems at the beginning of the first barrier section and is already subjected to initial stress here.
  • Fig. 1 shows a typical extrusion line
  • FIG. 2 shows a schematically illustrated extruder or a process unit consisting of a screw with a cylinder
  • FIG. 3 shows a detail from FIG. 2
  • FIG. 4 shows a sectional view of the detail of the processing unit shown in FIG. 3 in the extrusion direction
  • FIG. 1 shows a typical extrusion line as it is used today for profile extrusion, regardless of whether it is for the production of window profiles or pipes. It shows an extruder A in which plastic is melted and continuously conveyed into the extrusion tool B for shaping. This is followed by a calibration and cooling station C, depending on the profile, additional cooling stations can be used. After the cooling stations, an extraction device D follows. In order to cut the endless profiles P to the desired length, a cutting device T is then arranged.
  • Figure 2 shows schematically an extruder A or a process unit, with the cylinder 1, the screw 2, which extends in its procedurally relevant length from the material inlet of the filling opening E to the screw tip 3, and the main web 4, which is a distance Si to having inner wall 10 of cylinder 1.
  • the screw 2 is divided into four zones: the solids conveying zone I, the transition zone II, the melting zone III and the melt conveying zone IV.
  • two barrier sections X and Y that are separate from one another are indicated by way of example and each have an overflow web 5 and 6, respectively.
  • the first barrier section X begins here already in the transition zone II, but can also start in the melting zone.
  • the second barrier zone Y is located at the end (viewed in the conveying direction F), the melting zone III.
  • the areas of the barrier sections are shown schematically by dimension and auxiliary lines. The illustration illustrates the principle of the invention of the structure of the screw and therefore shows only a few turns of the main web and the transition webs, of course, extends z. B.
  • the melt channel formed by the main web 4 is divided into two channels in each case by the overflow webs 5, 6 that are separated from one another.
  • the overflow web 5 creates the channels 7 and 8 and in the second barrier section Y the overflow web 6 creates a further channel 9 running parallel to 8 Area of the first barrier section is grooved.
  • the barrier section X is highlighted separately in FIG.
  • the overflow webs 5 in the first barrier section X begins at the active one Flank 11 of the main web 4 and runs with a different pitch angle or a different pitch than the main web 4 to the passive flank 12 of the main web. With a constant slope of the overflow web, this is inevitably greater than that of the main web. In principle, however, the angle of inclination of the overflow web can also vary in the course of the barrier zone, for example in a section it can be the same as that of the main web.
  • the overflow web creates two separate channels 8 and 9.
  • the distance S2 of the overflow web 5 to the inner wall 10 of the cylinder 1 differs from the distance Si of the main web 4.
  • the stand S2 of the overflow web 5 is designed so that a material over occurs from Melt and / or solid is made possible.
  • additional barrier sections which are separate from one another are connected, where this can be limited to a second barrier section.
  • the design of the overflow webs of the two barrier sections does not have to be identical; for example, the slope angle, the flank geometry or the height can differ.
  • FIG. 4 shows a sectional view of the first barrier section X.
  • the cylinder 1 and the screw 2 can be seen in the section.
  • the worm 2 rotates at peripheral speed with Vo .
  • Main web 4 has a smaller distance Si to the inner wall 10 of the cylinder 1 than the overflow web 5. Its distance from the inner wall fertilizer 10 is marked with S2.
  • the cylinder grooves 15 running parallel to the screw 1 can also be clearly seen.
  • four pieces are shown by way of example. As already described above, however, there can also be fewer or more or also helically extending cylinder grooves.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne une extrudeuse monovis pour le transport et la plastification d'un matériau fusible, en particulier d'un thermoplastique, dans laquelle extrudeuse monovis, une vis (2) est maintenue rotative dans un cylindre chauffé (1), la vis (2) présentant un noyau et une arête principale hélicoïdale (4) qui présente une distance (S1) par rapport à la paroi interne (9) du cylindre (1) et, conjointement avec le cylindre (1) et le noyau de la vis (2), formant un canal de vis, la vis (2) comprenant, en fonction de l'état d'agrégat changeant du matériau fusible, une zone de transport de solides (I), une zone de transition (II), une zone de fusion (III) et une zone de transport de matière fondue (IV) et la distance (S1) de l'arête principale (4) par rapport à la paroi interne (10) du cylindre (1) dans la région des zones de transition et de fusion (II, III) étant choisie de telle sorte que la matière fondue ne peut pas passer au-dessus de l'arête principale (4). Selon l'invention, la région des zones de transition et de fusion (II, III) comporte au moins deux parties barrières successives non chevauchantes (X, Y) ; il y a une arête de trop-plein (5, 6) dans la trajectoire de chacune des parties barrières (X, Y), laquelle arête de trop-plein commence au niveau du flanc actif (11) de l'arête principale (4), lequel flanc actif est défini par la rotation de la vis et se termine au niveau du flanc passif (12) de l'arête principale (4), suite à quoi au moins trois canaux séparés (7, 8, 9) sont formés, qui sont interconnectés simplement par l'espace formé en raison de la distance (S2) de l'arête de trop-plein (5, 6) par rapport à la paroi interne (10) du cylindre (1) ; les distances (S2) des arêtes de trop-plein (5, 6) par rapport à la paroi interne (10) du cylindre (1) dans chaque partie barrière (X, Y) sont supérieures à la distance (S1) de l'arête principale (4) afin de permettre un transfert de matière de solides et/ou de matière fondue ; et au moins des parties de la paroi interne (10) du cylindre (1) sont pourvues au moins dans la région de la première partie barrière (X), d'au moins une rainure de cylindre (15) s'étendant parallèlement à l'axe longitudinal de la vis (2) ou d'une rainure de cylindre (15) s'étendant de manière hélicoïdale.
EP20801189.0A 2019-11-05 2020-11-01 Extrudeuse monovis Pending EP4081386A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019129717.6A DE102019129717A1 (de) 2019-11-05 2019-11-05 Einschneckenextruder
PCT/EP2020/080614 WO2021089444A1 (fr) 2019-11-05 2020-11-01 Extrudeuse monovis

Publications (1)

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CN114368119A (zh) * 2021-12-07 2022-04-19 五邑大学 一种单螺杆挤出注射装置
CN116811194B (zh) * 2023-08-30 2023-12-01 山东圣和薄膜新材料有限公司 一种单螺杆挤出机
CN117048016B (zh) * 2023-10-11 2023-12-26 江苏奥瑞斯智能装备有限公司 一种塑料生产用挤出成型机

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CH363149A (fr) * 1959-12-31 1962-07-15 Maillefer Sa Boudineuse à vis
US4128341A (en) * 1977-04-29 1978-12-05 Ingersoll-Rand Co. Extruder screw
DE19928870C2 (de) * 1999-06-24 2003-10-02 Extrudex Kunststoffmaschinen G Einschnecken-Extruder
DE10130759A1 (de) * 2001-03-14 2002-09-19 Extrudex Kunststoffmaschinen G Plastifiziersystem, Mischsystem für Flüssigkeiten und Verfahren zur Verarbeitung von Kunststoffmaterial mit einem Einschnecken-Plastifiziersystem
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DE102006011068A1 (de) * 2006-03-08 2007-09-13 Krauss-Maffei Kunststofftechnik Gmbh Extruderschnecke

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WO2021089444A1 (fr) 2021-05-14
DE102019129717A1 (de) 2021-05-06

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