EP4045248A1 - Pièce de mélange pour une unité de plastification d'une machine d'injection à vis - Google Patents

Pièce de mélange pour une unité de plastification d'une machine d'injection à vis

Info

Publication number
EP4045248A1
EP4045248A1 EP20807658.8A EP20807658A EP4045248A1 EP 4045248 A1 EP4045248 A1 EP 4045248A1 EP 20807658 A EP20807658 A EP 20807658A EP 4045248 A1 EP4045248 A1 EP 4045248A1
Authority
EP
European Patent Office
Prior art keywords
mixing part
plasticizing unit
nnze
screw
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.)
Withdrawn
Application number
EP20807658.8A
Other languages
German (de)
English (en)
Inventor
Stephan Nix
Henrik Stallkamp
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.)
Reifenhaeuser GmbH and Co KG Maschinenenfabrik
Original Assignee
Reifenhaeuser GmbH and Co KG Maschinenenfabrik
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 Reifenhaeuser GmbH and Co KG Maschinenenfabrik filed Critical Reifenhaeuser GmbH and Co KG Maschinenenfabrik
Publication of EP4045248A1 publication Critical patent/EP4045248A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/40—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft
    • B29B7/42—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft with screw or helix
    • B29B7/428—Parts or accessories, e.g. casings, feeding or discharging means
    • B29B7/429—Screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
    • B29B7/488—Parts, e.g. casings, sealings; Accessories, e.g. flow controlling or throttling devices
    • B29B7/489—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
    • B29C48/505—Screws
    • B29C48/535—Screws with thread pitch varying along the longitudinal axis
    • 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
    • B29C48/56—Screws having grooves or cavities other than the thread or the channel
    • 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
    • B29C48/595—Screws characterised by details of the thread, i.e. the shape of a single thread of the material-feeding screw the thread having non-uniform width
    • 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
    • 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
    • B29C48/605—Screws characterised by details of the thread, i.e. the shape of a single thread of the material-feeding screw the thread being discontinuous
    • 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
    • B29C48/61—Threads having wavy profiles
    • 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
    • B29C48/615—Threads having varying helix angles
    • 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
    • B29C48/67—Screws having incorporated mixing devices not provided for in groups B29C48/52 - B29C48/66

Definitions

  • the invention relates to a mixing part for a plasticizing screw of a plastics processing machine.
  • the invention also relates to a method for mixing a plastic melt in a plasticizing unit of a plastic processing machine.
  • a plastic processing machine is to be understood as a machine with the aid of which a semi-finished product or finished part can be produced from a supplied plastic material.
  • a plastic material is a polymer-containing material that is usually present as a raw material in solid or liquid form. Solid forms are, for example, granules or, in the case of recycled material, also film fragments, also irregularly shaped or lenticular, so-called flakes. Examples of such plastics processing machines are extruders or injection molding machines. Extruders are machines in which solid to viscous, physically or chemically hardenable masses are pressed out continuously or discontinuously under pressure by means of plasticizing screws from a shaping opening, the nozzle.
  • plastics processing screw extruders are widely used in which plastic raw material, in particular thermoplastic plastic raw material, is conveyed and melted with a plasticizing unit.
  • the plasticizing unit usually has a plasticizing screw rotatable in a cylinder.
  • the plasticizing screw has screw flights, whereby the corresponding plasticizing screw can be characterized by the flight depth and pitch as well as its length and diameter.
  • Injection molding machines are machines that can be used to manufacture plastic molded parts from plastic, for example in the form of granules.
  • the molding compound required is prepared in an injection unit which, like the extruder, has a plasticizing device, that is to say, for example in the case of thermoplastics, it is melted, conveyed and homogenized, and then injected into a tool Negative shape, ie a hollow shape, called a cavity, represents the desired plastic molded part.
  • a plasticizing device that is to say, for example in the case of thermoplastics
  • a tool Negative shape ie a hollow shape, called a cavity
  • various machine components are tempered, ie heated or cooled.
  • the injection unit usually has a plasticizing screw that can be rotated in a cylinder, the plasticizing screw here also being translationally movable and thus able to serve as an injection piston.
  • the injection molding process is a cyclical, discontinuous process, whereby melted material is injected into the cavity during thermoplastic injection molding, where it has to cool down at least to the point where it freezes to such an extent that the molded part can be removed from the mold without damage.
  • the process of injecting is also known as a shot.
  • the melt is prepared for the next shot in the plasticizing unit. Once the required cooling time has expired, the tool is opened and the molded part is removed from the mold. The mold is then closed again and the next cycle begins.
  • Extruders and injection molding machines are collectively referred to as screw machines.
  • a three-zone screw has a feed zone in which the granulate is drawn from a funnel into the plasticizing unit. This is followed by a compression and melting zone. The compression and melting zone is in the middle part of the screw. This is where the worm thread narrows in order to build up increased pressure. The molding compound is compressed and the air trapped in the poured granulate is pressed out. Frictional heat is now generated within the molding compound, which, supported by the heated cylinder, causes the molding compound to melt.
  • the compression and melting zone is followed by the homogenization and discharge zone, also known as the metering zone.
  • the viscous melt should be mixed and a uniform distribution of the temperature and any additives added, such as processing aids or color particles, should be achieved.
  • any additives added such as processing aids or color particles
  • the material homogenization can be used, for example, to ensure a homogeneous coloring of the material, for example by adding a To achieve masterbatches.
  • other additives which serve, for example, to change the properties of the plastic product produced, can also be fed to the plasticizing unit with the granules, these additives also having to be distributed homogeneously in the melt.
  • the thermal and mechanical homogenization also serves to increase the quality of the plastic part produced.
  • mixing parts are known to improve the mixing action of screw machines. These mixing parts can be connected downstream of the plasticizing screw in the melt flow or they can also be integrated into the plasticizing screw.
  • the plasticizing performance of injection-molding plasticizing units has been continuously increased in the past due to increased efficiency. These increases in efficiency relate to both cycle time reductions, so that the plasticizing process must also take place at a higher speed, and increases in throughput, ie more material has to be plasticized with the same diameter of the plasticizing screw.
  • the geometries of the plasticizing screws must be adapted so that a higher plasticizing capacity can be achieved. For example, worm flight depths or pitches are increased.
  • An additional screw flight can also be introduced in order to achieve an even higher plasticizing performance.
  • This screw construction is generally called a barrier screw. In barrier screws, a second screw flight with a barrier web separates the melt from the residual granulate.
  • the so-called barrier web separates the solid from the melt.
  • the melted material can flow from the solids channel into the melt channel via the barrier web.
  • the increased friction due to the separation of the solid and the melt leads to a higher plasticizing performance.
  • the solids are retained and the air that is trapped during the melting process in conventional screws can escape through the solids channel. The escape of unmelted solid particles from the plasticizing zone is prevented and a well-digested melt is guaranteed, which is particularly necessary with high throughputs and high screw speeds.
  • the material, thermal and mechanical homogeneity of the plastic melt represents a limit to the possible increase in plasticizing performance
  • Plasticizing units for injection molding applications are generally shorter than those for extrusion applications.
  • the reason for this is, among other things, that because of the discontinuous injection molding process, the melt has to endure downtimes in the plasticizing unit at the high temperatures required to melt the material.
  • Another reason for the shorter plasticizing screws in injection molding machines is the larger space requirement caused by the translational movement of the screw. So if the plasticizing unit of an injection molding machine is not to be larger than that of an extruder, the screw in the injection molding machine unit must be shorter than that in an extruder unit. In order to keep the thermal load on the material as low as possible so that no thermal damage to the melt occurs, the length of the plasticizing device is limited. Another reason for the shorter plasticizing units of injection molding machines is the saving of machine installation space.
  • the object of the invention is therefore to provide a new mixing part which can be efficiently installed in a short plasticizing unit such as an injection molding unit. This can mean, for example, that a mixing part within the meaning of the present invention is installed in a particularly compact or particularly space-saving manner.
  • this object is achieved by a plasticizing unit of a screw machine, with a screw, which has a spatially limited mixing part according to claim 1, this mixing part having a dispersion part and a distribution part as well as a flight depth and also an expansion area and a shear area.
  • Advantageous further developments of the plasticizing unit result from subclaims 2 to 22.
  • the object of the invention is achieved by a method having the features of independent claim 23.
  • Mixing parts come in a variety of forms. These are generally divided into dispersive and distributive mixed parts. Dispersive mixing parts primarily break up the melt strand, which means that areas that have not been sheared can be melted. Distributive mixing parts primarily distribute the melt strand, which means that it can be mixed and rearranged. There are numerous variants of mixing parts for both types of mixing parts. An example of a dispersive mixing part is the spiral shear part. An example of a distributive mixing part is the diamond mixing part.
  • a technical effect of the distributive and dispersive mixing parts is created by the combination and design of their individual technical features. These include worm thread, thread depth, thread pitch, thread table, shear part, web, guideways and other features from the prior art.
  • the screw flight is generally used to denote the raw material path, for example shaped like a screw in the plasticizing direction, which is usually flanked by two webs, runs along the entire screw, or at least partially leads along it.
  • the alignment of a worm gear can be referred to as the flight guidance.
  • This gear guide can be designed, for example, in a helical clockwise or counterclockwise direction along the plasticizing direction on the plasticizing screw. This alignment can be present along the entire screw or part of it. The orientation is generally dependent on the screw rotation.
  • a gear guide is clockwise if the worm rotation is also clockwise.
  • a left-hand gear guide is provided for a left-hand worm rotation.
  • the flight depth is a structural feature of both the screw of a plasticizing unit and a mixing part for such a screw and accordingly also a mixing part in the sense of the present invention.
  • the flight depth can be viewed as the depth, i.e. the distance h from a virtually elongated web top to the axially symmetrical screw surface s.
  • a passage depth can be in one Snail duct Occurrence as a fundamentally leading subsoil or soil, or between or on shear parts, or other technical features of a snail.
  • a flight depth can have different geometrical or structural embodiments. For example, it can run parallel to the screw axis along the conveying direction. However, a passage depth can also follow different directions along the conveying direction. For example, a flight depth can have a subsection that is lowered, that is to say a subsection that is lowered in the direction of the screw center, along the conveying direction. This lowering subsection can also have different geometric features. This lowering subsection can, for example, be straight or also odd, for example curved, undulating, step-shaped, vertically sloping or also occur in other generally known geometric designs.
  • a pitch more precisely a worm pitch, can have different geometrical or structural embodiments. For example, it can run parallel to the screw axis along the conveying direction. However, a pitch can also follow different directions along the conveying direction. For example, a pitch can have a rising section, that is to say a section rising in the direction of the plasticizing cylinder, along the conveying direction. This rising subsection can also have different geometric features. This rising subsection can, for example, be straight or also odd, for example curved, undulating, stepped, rising vertically or also occur in other generally known geometric designs.
  • a flight pitch differs from a flight depth in that the distance from the screw surface along the flight pitch to the plasticizing cylinder is reduced, at least partially.
  • a worm table is an axially symmetrical sub-area of a worm thread that is locally present on a worm thread.
  • a flight table can be higher or lower than the worm flight.
  • an aisle table is designed to be flat and planar.
  • An aisle table can, for example, be between an aisle pitch and lie between a passage depth.
  • An aisle table can, for example, be part of a particularly small partial cavity between the plasticizing screw and the plasticizing cylinder.
  • a shear part for example on a mixing part, for the plastics processing described here, must in principle have a wide range of features and properties.
  • a shear part is constructed on the plasticizing screw, in a variety of designs.
  • a shear part can have a diamond shape, which is constructed in any orientation on the screw.
  • the shear part is preferably aligned with the shear edge in the direction of the direction of rotation of the plasticizing screw.
  • the main task of the shear part is, but not exclusively, to plasticize and homogenize the solids introduced into the plasticizing unit.
  • the task of the shear part is to locally stretch the chain molecules of a thermoplastic in its own position to such an extent that the thermoplastic is plastically deformed. This creates so-called shear bands.
  • the melt is mixed by creating individual shear bands and distributing these shear bands.
  • a shear part within the meaning of the invention described here, has a shear edge.
  • a shear edge can be present at any position on the shear part.
  • a shear edge orthogonal to the screw axis is preferred in order to shear the introduced molecules as effectively as possible.
  • a shear edge can also occur at any other technically meaningful angle.
  • a shear edge can be designed in any desired length.
  • a web is a structural feature that can separate two worm flights from one another.
  • a web is constructed on a plasticizing screw and has a smaller radial distance to the plasticizing cylinder than the adjacent flight depths or pitches.
  • a bridge can be connected to another bridge via a table. More precisely, two webs can form a flat surface with the help of a table, which, for example, is a can compress brought melt particularly effectively. A particularly favorable expansion area would arise behind this surface.
  • a stretch range is generally a range in which a melt can be stretched particularly well in the process.
  • An expansion supports the plasticization of the melt or a possibly not yet plasticized part of a mixture of melt and initially introduced raw material.
  • a shearing area has a partial area of a plasticizing unit at which a melt is sheared particularly well.
  • This shear area can contain a plasticizing screw, but also an additional mixing part.
  • Guideways can be placed on a plasticizing screw, in any direction. They can preferably be introduced along the plasticizing direction and impress the plasticizing direction on a melt or a raw material melt mixture. In general, they can also be viewed as a groove on a worm gear. There can also be guide lines in the form of a groove on a web.
  • the flow in the sense of the present invention, describes the flow behavior of the melt, the solids or any mixture of both as well as a raw material that is in the transition from one physical state to another physical state, under the influence of the plasticizing unit and its technical components, such as for example the screw and the cylinder, but in particular also a mixing part.
  • a barrier is a constructive feature of a mixing part.
  • a barrier is constructed between at least two webs. In general, it reduces the cavity of the space between the cylinder of the plasticizing unit and the flight of a screw at least locally at any location on the mixing part.
  • This can be implemented with the help of a constructive feature such as an aisle gradient or a subsequent aisle depth, but it can also be implemented differently.
  • a barrier can also be designed as a simple wall, aligned against the direction of plasticization. This wall can, for example, be constructed orthogonally, at least on one side, to the course of the corridor.
  • a barrier can have a front and a back. Here it is It is irrelevant in which process direction these sides point, accordingly, for example, a front side can point both in the direction of plasticization and against the direction of plasticization.
  • both a shear flow and an elongate flow can be generated in the melt with the dispersion part.
  • both an expansion flow and a shear flow can be generated in the melt with the distribution part.
  • the distribution part can be used to generate both an expansion flow and, at the same time, a shear flow in the melt, the distribution part having at least one concave shear part.
  • both an expansion flow and a shear flow can be generated in the melt with the distribution part, the distribution part having at least one concave shear part, wherein in the at least one concave shear part, at least in one area, the depth of a screw flight compared to a other area is modified.
  • a multiple alternating flow of elongation and shear flow can be generated in the melt.
  • the mixing part has different passage depths.
  • the mixing part has at least one wave-shaped variation of the flight depths.
  • the mixing part has at least one pyramidal variation in the passage depth. In a further advantageous embodiment, the mixing part has a defined gap between two adjacent screw flights, through which at least part of the melt can be forced to pass.
  • the mixing part has a plurality of webs with interruptions.
  • the mixing part has a plurality of entrenchments.
  • the mixing part is exchangeable.
  • the mixing part can be mounted on a screw as desired.
  • the mixing part can be designed as a conversion kit that can be retrofitted onto screws of the appropriate size (diameter and length).
  • the mixing part can be placed anywhere along the screw.
  • the mixing part does not have to be placed after the metering zone of a three-zone screw, but can also be placed elsewhere, for example directly in front of the metering zone or in front of another zone or in a zone.
  • the mixing part is installed in a stationary manner along the screw as desired.
  • the mixing part can be combined as desired with an additional mixing part of the same type.
  • the mixing part is mounted axially and rotatably with the screw rotation. In a further advantageous embodiment, the mixing part is mounted axially and rotatably against the screw rotation.
  • the mixing part has a non-return valve.
  • the temperature of the mixing part can be controlled. Temperable means that the mixing part can be heated or also cooled. The heating can take place, for example, electrically or via a fluid. The cooling can also take place, for example, via a fluid.
  • the mixing part has additional guide tracks along its aisle guides.
  • the inventive method for producing a melt in a plasticizing unit, in a screw machine, with the aid of at least one inventive mixing part is characterized by the steps
  • FIG. 1 shows a mixing part 200 according to the invention, consisting of a dispersion part 207 and a distribution part 208 additionally having a pronounced flight depth 202 in the distribution part 208.
  • An additional flight pitch 203 is also shown in FIG. 1, schematically in its steps, in section AA, next to a shear part 205 shown arranged.
  • FIG. 1 shows a mixing part with a clockwise gear guide in the Distribution part 208, which is virtually continued by the following dispersion part 207.
  • Each aisle depth 202 is adjacent along its own reach by a formed ridge 212.
  • the ridge 212 is continuously stamped on the distribution part 208.
  • the dispersion part 207 is characterized by individual shear parts 205 which are guided along the virtually elongated thread guide and have a shear edge in the direction of the screw rotation R.
  • the shear parts 205 can be different in height and the webs 212 can also be different in height.
  • FIG. 2 shows a detail (X) from FIG. 1, more precisely the table of a shear part 205 with a concave shape in the screw rotation direction R.
  • a special characteristic is the concave curve of the shear part 205, which also allows an additional stretch to be introduced on the sheared plastic polymer directly at the shear. This therefore represents an additional individual combination of the important properties of shear and elongation within the mixing part.
  • the original straight edge of the shear part is followed by a dashed line in order to illustrate the characteristics of the concave curve on the inside.
  • the section AA shows a schematic flight depth variation on a shear part 205 in the dispersion part 207 of the mixing part 200 from FIG. 1.
  • the flight depth variation is guided exclusively by straight flight depth changes beginning with a downward guidance of the flight depth 202 which is supplemented by a flat part and is finally led back up to the original passage depth 202 but does not end there, but is continued in a passage incline 203.
  • This pitch 203 is led to the level of the adjacent webs 212 and ends there in a flat table. Finally, the pitch 203 is brought back down to the level of the original pitch 202.
  • This invention can also act as a barrier 214.
  • FIG. 4 shows a further schematic variation of section AA from FIG. One.
  • the thread depth 202 is also based on a shear part 205.
  • the variation of the flight depth 202 is not guided straight, but in a wave-like manner. This allows a particularly resistance-free guidance of a melt flowing along it.
  • the variation is otherwise identical in their routing to FIG. 3.
  • the aisle depth 202 descends to a lower level, in order then to rise to the level of the surrounding webs 212 with the aid of an aisle gradient 203.
  • no table is formed here, but “only” a wave tip which finally lowers and leads back to the original passage depth 202.
  • This variation can also act as a barrier 214.
  • FIG. 5 shows a further variation of a combined mixing part 200.
  • an expansion ring 216 is inserted instead of a previously defined classic distribution part 208.
  • the expansion ring 216 encompasses the mixing part 200 radially and acts through its clearly cavity-reducing circumference. More precisely, the expansion ring 216 reduces the distance between the plasticizing cylinder and the mixing part 200 on the upper side of the expansion ring
  • an expansion ring 216 can influence the efficiency of a mixing part 200 particularly well.
  • a classic plasticizing screw This can be, for example, the metering area of a three-zone screw.
  • part of a barrier screw can also be shown. Therefore, this part is not discussed or illustrated in detail here.
  • FIG. 6 shows a further variation of a mixing part 200.
  • a special feature here is the narrowing of the aisle in the distribution part 208. More precisely, FIG. 6 shows a mixing part 200 consisting of a distribution part 208 and a dispersion part 207. These features are known, for example, from FIG equally trained. In the central corridor, however, there is now an additional corridor narrowing on the two accompanying walkway walls
  • This passage narrowing 217 causes a compression of the melt or other raw material mass brought in in the plasticizing direction F, and then a corresponding expansion.
  • the advantage of an aisle narrowing 217 is that it can occur at any point in a passage and can be designed as desired. This allows the designer to narrow the aisle 217 for any raw material that can be introduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne une unité de plastification d'une machine d'injection à vis, comprenant une vis avec une partie de mélange (200), et cette partie de mélange (200) ayant une partie de dispersion (207) et une partie de distribution (208) et ayant également une profondeur de vol (202). L'invention est caractérisée en ce que la partie de mélange (200) a une région d'allongement et une région de cisaillement.
EP20807658.8A 2019-10-15 2020-10-15 Pièce de mélange pour une unité de plastification d'une machine d'injection à vis Withdrawn EP4045248A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019127839.2A DE102019127839A1 (de) 2019-10-15 2019-10-15 Mischteil für eine Plastifiziereinheit
PCT/DE2020/200089 WO2021073699A1 (fr) 2019-10-15 2020-10-15 Pièce de mélange pour une unité de plastification d'une machine d'injection à vis

Publications (1)

Publication Number Publication Date
EP4045248A1 true EP4045248A1 (fr) 2022-08-24

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ID=73451980

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Application Number Title Priority Date Filing Date
EP20807658.8A Withdrawn EP4045248A1 (fr) 2019-10-15 2020-10-15 Pièce de mélange pour une unité de plastification d'une machine d'injection à vis

Country Status (3)

Country Link
EP (1) EP4045248A1 (fr)
DE (2) DE102019127839A1 (fr)
WO (1) WO2021073699A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115157591B (zh) * 2022-06-21 2023-10-27 华南理工大学 一种交变式拉伸混炼元件与方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3941535A (en) * 1974-10-01 1976-03-02 Street Louis F Extrusion device
US4154536A (en) * 1977-07-25 1979-05-15 Beloit Corporation High efficiency injection molding screw
US4227870A (en) * 1979-03-14 1980-10-14 The B. F. Goodrich Company Apparatus for working rubber compounds
US5215764A (en) * 1991-06-10 1993-06-01 Westland Corporation Extruder mixing screw
US6488399B1 (en) * 2001-05-17 2002-12-03 Timothy W. Womer Apparatus for plasticating thermoplastics
EP3094467A1 (fr) * 2014-01-17 2016-11-23 Reifenhäuser GmbH & Co. KG Maschinenfabrik Section de mélange pour une vis d'extrusion de plastique
US10532490B2 (en) * 2016-04-06 2020-01-14 Davis-Standard, Llc Plasticating apparatus screw having grooves of varying angles and depths
DE102017113836B4 (de) * 2017-06-22 2022-04-21 KraussMaffei Extrusion GmbH Extruderschnecke, Extrusionsvorrichtung mit Extruderschnecke sowie Verfahren zum Plastifizieren eines Kunststoffes
DE102018006234B4 (de) * 2018-08-08 2023-11-30 Jochen Hennes Einschnecke mit Mischfunktion

Also Published As

Publication number Publication date
DE102019127839A1 (de) 2021-04-15
WO2021073699A1 (fr) 2021-04-22
DE112020005056A5 (de) 2022-11-10

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