EP3188888A1 - Dispositif de retournement pour le retournement d'une matière fondue et procédé de rinçage - Google Patents

Dispositif de retournement pour le retournement d'une matière fondue et procédé de rinçage

Info

Publication number
EP3188888A1
EP3188888A1 EP15757488.0A EP15757488A EP3188888A1 EP 3188888 A1 EP3188888 A1 EP 3188888A1 EP 15757488 A EP15757488 A EP 15757488A EP 3188888 A1 EP3188888 A1 EP 3188888A1
Authority
EP
European Patent Office
Prior art keywords
melt
turning device
section
channels
channel
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Withdrawn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
EP15757488.0A
Other languages
German (de)
English (en)
Inventor
Martin Backmann
Hermann-Josef Jäckering
Markus Bussmann
Bernd LIESBROCK
Karsten Golubski
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.)
Windmoeller and Hoelscher KG
Original Assignee
Windmoeller and Hoelscher KG
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 Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Publication of EP3188888A1 publication Critical patent/EP3188888A1/fr
Withdrawn legal-status Critical Current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
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/432—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/432—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa
    • B01F25/4321—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa the subflows consisting of at least two flat layers which are recombined, e.g. using means having restriction or expansion zones
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/432—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa
    • B01F25/4321—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa the subflows consisting of at least two flat layers which are recombined, e.g. using means having restriction or expansion zones
    • B01F25/43211—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa the subflows consisting of at least two flat layers which are recombined, e.g. using means having restriction or expansion zones using a simple by-pass for separating and recombining the flow, e.g. by using branches of different length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/432—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa
    • B01F25/4322—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa essentially composed of stacks of sheets, e.g. corrugated sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/432—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa
    • B01F25/4323—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa using elements provided with a plurality of channels or using a plurality of tubes which can either be placed between common spaces or collectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/432—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa
    • B01F25/4323—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa using elements provided with a plurality of channels or using a plurality of tubes which can either be placed between common spaces or collectors
    • B01F25/43231—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa using elements provided with a plurality of channels or using a plurality of tubes which can either be placed between common spaces or collectors the channels or tubes crossing each other several times
    • 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
    • B29B7/32—Mixing; Kneading continuous, with mechanical mixing or kneading devices with non-movable mixing or kneading devices
    • B29B7/325—Static mixers
    • 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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • 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
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • 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
    • B29C48/256—Exchangeable extruder parts
    • 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
    • B29C48/269—Extrusion in non-steady condition, e.g. start-up or shut-down
    • B29C48/2692—Material change
    • 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
    • B29C48/27—Cleaning; Purging; Avoiding contamination
    • 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
    • B29C48/275—Recovery or reuse of energy or materials
    • B29C48/277—Recovery or reuse of energy or materials of materials
    • 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
    • B29C48/362—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using static mixing devices
    • 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
    • B29C48/70—Flow dividers, e.g. breaker plates comprising means for dividing, distributing and recombining melt flows
    • 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
    • B29C48/70—Flow dividers, e.g. breaker plates comprising means for dividing, distributing and recombining melt flows
    • B29C48/705—Flow dividers, e.g. breaker plates comprising means for dividing, distributing and recombining melt flows in the die zone, e.g. to create flow homogeneity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
    • F15D1/00—Influencing flow of fluids
    • F15D1/02—Influencing flow of fluids in pipes or conduits
    • 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
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/802—Constructions or methods for cleaning the mixing or kneading device
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/1753—Cleaning or purging, e.g. of the injection unit
    • 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
    • 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
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Definitions

  • the present invention relates to a turning device for turning a melt in a melt channel, a blowing head for performing a blown film extrusion process, and a method for performing a flushing operation in an extrusion device.
  • extrusion devices are used to produce a plastic melt.
  • This plastic melt can be used in many different ways.
  • the melt is provided for a so-called bubble extrusion process in which a blown film is extruded.
  • the liquefied melt is transported via appropriate melt channels to the respective place of use. These channels can be arbitrarily complex and in particular can also be divided into individual channels.
  • a disadvantage of the known solutions of the extrusion devices is that they bring a lot of effort for the change of material with it. Thus, a so-called rinsing process must be carried out if a material change from a first melt material to a second melt material is to take place. If, for example, a product with a blue film color is produced for a certain time in a blown film extrusion device and then a change to a transparent film color is desired, first the blue film color and the corresponding melt material must be rinsed out of the individual melt channels. For this purpose, the extrusion device is already operated with the following material until most of the old material of the melt has been rinsed out.
  • a turning device according to the invention serves to turn a melt in a melt channel.
  • the turning device has a melt inlet and a melt outlet, wherein at least one melt-guiding means is arranged between the melt inlet and the melt outlet.
  • the melt-guiding means serves to shift melt from the middle of the melt inlet to the edge of the melt outlet.
  • the melt-guiding means is adapted for a redistribution of melt from the edge of the melt inlet to the center of the melt outlet.
  • the center of the melt outlet may be the entire melt output region with a gap of about 5mm to the edge.
  • an active routing by means of the melt-guiding means automatically changes the melt in the melt channel.
  • the turning device can be inserted into the melt channel or form part of the melt channel.
  • a fluid-communicating connection to the melt channel is produced via the melt inlet, so that the melt can flow into the turning device via the melt inlet.
  • the melt is redirected via the melt-guiding agent in accordance with the invention.
  • the transferred melt will leave the turning device again and continue to flow through the fluid-communicating connection in the melt channel.
  • the melt-guiding means are designed for redepositing the melt.
  • Two basic shift functionalities are provided.
  • the melt from the middle is used at the melt inlet and led to the edge of the melt outlet.
  • the melt melts from the edge of the melt inlet to the middle of the melt outlet.
  • the material is interchanged from the middle at the melt inlet with the material at the edge of the melt input, so that there is a completely rearranged melt layer situation at the melt outlet.
  • a turning device according to the invention now considerably reduces the rinsing time when used in an extrusion device.
  • a reduction by up to 50% of the total rinsing time can be obtained by a turning device according to the invention.
  • Another advantage is the reduction of the residence time of the melt on the edge even in normal operation. That way you can Reduce the thermal impact on the material, reducing or even avoiding material degradation.
  • the turning device can be used in the melt channel or form the melt channel. Of course, two or more turning devices can be provided with a defined distance in a melt channel. It is preferred, as will be explained in more detail later, when the turning device is located in relation to the length of the melt channel substantially centrally located in this.
  • the melt guide by means of the melt guide means can be configured in different ways.
  • the functions which will be explained later can be provided in a division by a melt-guiding means, as is conceivable through active guide channels within the melt channel.
  • the at least one melt-guiding means has a dividing section with a first partial channel and a second partial channel.
  • a dividing section for dividing the melt onto partial channels and after the dividing section a combination section for merging the melt from the partial channels is arranged in front of the dividing section.
  • a turning device can be further developed such that the combination portion is formed for a central merging of the edge portions of the melt.
  • this is meant that there is an explicit geometric orientation of the individual sub-channels in the combination section. If, for example, the edge sections with old material of the melt are located on the outside of the respective sub-channel after the splitting section, the two sub-channels in the combination section can be brought together in such a way that the two edge sections of the melt in the sub-channels are brought together centrally with old material. This results in a recombination of the partial streams of the melt under a complete or substantially complete redistribution, so that now has shifted by skillful recombining of the partial streams, the edge layer before the melt inlet in the middle at the melt output.
  • the respective diameter of the partial channels is preferably adapted to the diameter before the dividing section and after the combination section. If, for example, a division into two subchannels is carried out, they preferably have in each case half the diameter in comparison to the diameter before the melt input.
  • the sub-channels are curved, in particular forming a toroidal shape.
  • the sub-channels can ensure in this way a particularly compact design of the turning device.
  • a sufficient length of the entire division section can be provided by the curved configuration of the sub-channels and at the same time minimizes the geometric dimensions of the turning device.
  • the sub-channels are reduced in terms of their maximum length, so that unnecessary space can also be avoided.
  • the curvature of the individual sub-channels may differ from each other. However, it is preferred if the individual sub-channels have the same or substantially the same sub-channels or the same Have curvatures.
  • both the length and the curvature between the existing sub-channels are identical, so that the sub-channels are at least partially mutually preferably formed completely symmetrical.
  • a torus shape can be formed by means of the subchannels.
  • this leads to flow-related advantages, so that there are only slight or no flow velocity differences between the inflow in the dividing section and the outflow in the combination section. This leads to improved production quality when using the turning device, since layer breaks can be effectively avoided.
  • the subchannels have the same or essentially the same length. This avoids warping for combining in the combination section particularly effectively and efficiently. In addition, an undesired layer break can be avoided or at least reduced by a reduction in distortion. Finally, by adjusting the length of the two sub-channels, positive influence can also be exerted on the compactness of the design of the entire turning device. It is also advantageous if, in a turning device according to the invention, the flow direction of the melt in the combination section has an acute angle with the flow direction of the melt in the splitting section. This is to be understood as meaning that at least a partial deflection of the flow direction of the melt takes place.
  • this deflection takes place at an acute angle, so that in particular a reversal or a partial recycling of the melt is carried out.
  • circular shapes, or even heart-shaped shapes are executed.
  • the return leads automatically to the possibility of combining, as has already been explained.
  • the sub-channels have a curvature which changes the flow direction of the melt at least in sections compared to the flow direction of the melt in the splitting section by more than approximately 90 °.
  • this deflection with respect to the melt channel can also be carried out upwards or downwards. This makes it possible for the shiftwork functionality to be performed even more compactly.
  • three-dimensional constructions of an intertwined sub-channel geometry can be used to enable the shifter functionality according to the invention.
  • the combination section can also be arranged enclosed between the individual sub-channels, so that cost-effective, simple and, above all, in a particularly compact design of the combination section makes it possible to redeploy the invention. Accordingly, even more compact dimensions for the turning device according to the invention can be achieved in this way.
  • a further advantage may be if, in a turning device according to the invention, the sub-channels have a dividing wall, which results from the division, and an outer wall, which is taken over from the dividing section. In this case, the outer walls of the sub-channels are combined in the combination section and the partition walls go over into the outer walls of the combination section. This is an explicit geometric correlation statement, as the individual walls correlate with each other via the flow of the melt.
  • the wall surface is increased accordingly.
  • parts of the wall surfaces namely the partition walls, re-emerge through the partitioning section.
  • the newly formed partition walls also correlate with newly forming edge sections of the melt at the edge of these partition walls. This is accordingly provided from the middle of the flowing melt, so that the partition walls now have new melting material at the edge.
  • the outer walls, which from the melt channel or the melt input via the Distribution section are taken over, are now provided with the old melting material.
  • the melt outlet is provided with new outer walls, which are now provided with new melt material through the correlation with the partition walls.
  • the outer walls of the individual sub-channels which still correlate with the old melt material, are brought together in the middle and dissolve, so to speak.
  • the corresponding old melt material is brought together by the dissolving outer walls of the dividing channels in the middle in the combination section and the Um Mrsvorgang invention is completed.
  • the individual sub-channels can have any change in direction and curvature without affecting the corresponding orientation of the partition walls and the outer walls and, consequently, the alignment of the old melt material and the new melt material thereof. Rather, the orientation of the outer walls and the partition walls and thus also the orientation of the new melt material and the old melt material follows any curvature and thus the course of the individual sub-channels.
  • the partial channels have a spiral shape with each other at least in sections.
  • This spiral shape can also be formed in particular with three or more subchannels.
  • a spiral rotation is preferably performed by degrees, which correlates with the number of subchannels. For example, if there are two sub-channels, the spiral is preferably provided with a spiral rotation angle of 180 °. If four dividing channels are provided, a rotation angle for the spiral of 90 ° is preferably provided. Accordingly, a preferred rotation angle for the spiral results from a calculation in which one divides 360 ° by the number of subchannels present.
  • a further advantage can be achieved if a displacement device is provided in a turning device according to the invention for a displacement of the turning device between a first position and a second position.
  • the melt inlet and the melt outlet are in fluid communication with the melt channel.
  • the melt input and the Melt outlet separated from the melt channel.
  • the displacement device for example, translationally, rotationally or in a combined manner perform a movement of the turning device.
  • a piece of pipe or a channel piece is provided for the turning device in the second position, which connects the two remaining end portions of the melt channel fluidkommunilastd each other.
  • the displacement device thus makes it possible, as it were, to switch on the switching function by inserting the turning device and to switch it off by pushing out the turning device.
  • the turning device Since the turning device generates a corresponding pressure loss situation due to its turning functionality, it is advantageous to switch off this turning function during normal operation.
  • the increased pressure loss is used exclusively during the rinsing process to ensure the appropriate Um Mrsfunktion.
  • the increased pressure loss of the turning device is switched off by pushing out the turning device in the second position during normal operation and can not disturb accordingly.
  • the melt inlet and the melt outlet have a free flow cross-section which corresponds to or essentially corresponds to the free flow cross-section of the melt channel.
  • a fluid-communicating connection between the melt inlet and the melt channel or between the melt outlet and the melt channel is possible continuously and without edge or diameter variation.
  • Such a turning device can be used completely in the melt channel or even partially form the melt channel.
  • a free flow cross section is to be understood as meaning the cross section perpendicular to the flow at the respective position. In other words, the free flow cross section forms the flow cross-sectional area over which the volume flow of the melt can flow.
  • the free flow cross-section corresponds or essentially corresponds to the melt-guiding means to the free flow cross-section of the melt inlet and / or the free flow cross-section of the melt outlet.
  • the flow cross section of the melt-guiding means is preferably the sum all melt-guiding agent.
  • a pressure drop which is generated by the corresponding action on the flow direction and, consequently, by the active redeployment of the melt.
  • a widening of the melt channel may allow such a geometric correlation in the area of the turning device. It is also conceivable that, when dividing in a dividing section, a corresponding adaptation of the flow cross sections through the corresponding diameters of the partial passages is made available.
  • a blow head for carrying out a blown film extrusion process.
  • a blow head has at least one melt channel for conveying melt to a blowing outlet of the blow head.
  • An inventive blow head is characterized in that at least one turning device according to the present invention is arranged in the at least one melt channel.
  • the melt channel is in fluid communication with the melt inlet and the melt outlet of the turning device.
  • such a blowing head is provided with two or more melt channels for different layers of the blown film.
  • the turning device is preferably arranged in the same or identical embodiment in all melt channels in order to be able to provide the same flushing time reduction in accordance with the invention for all melt channels.
  • a blowing head according to the preceding paragraph can be further developed such that the turning device is arranged with respect to the length of the melt channel in the middle or substantially in the middle of the melt channel. It is an optimized positioning of the turning device, which allows the maximum reduction of the flushing time by about 50%.
  • two or more turning devices are possible, which are preferably used with the same or identical pitch in the respective melt channel.
  • a blowing head according to the invention can be further developed in such a way that adjacent sub-channels of adjacent turning devices are recombined into melt channels. In other words, the individual turning devices interact with each other or merge into each other.
  • a splitting section can be provided, which performs the corresponding division into two subchannels.
  • melt channels can provide an identical division into two subchannels.
  • the right sub-channel can now be merged with the left sub-channel of the right melt channel in a common combination section.
  • the left sub-channel of the middle melt channel can be merged with the right sub-channel of the left melt channel in a combination section.
  • a plurality of melt channels can form such a circle, so that, in principle, a shift in the circumferential direction for the combination sections represents a correlation of the individual turning devices with one another. This makes it possible to design a corresponding turning device for a plurality of melt channels without a high requirement for space. In addition to the reduction in space requirements, such a star distribution can also bring advantages in terms of the actual flow course within the individual melt channels and especially in the combination sections.
  • each turning device covers only a part of the respective edge and thus only from this part of the edge, the melt re-coated in the middle.
  • each turning device perform the switching for another peripheral portion, so that after the passing of all turning devices melt has been redeployed from the full-circumference edge in the middle.
  • four turning devices can cover each other in each case 90 ° circumference of the edge with the Um Mrsfunktion, so that in sum, the entire circumference of 360 ° is rearranged.
  • a further subject of the present invention is a method for carrying out a rinsing process in an extrusion device, in particular in a die according to the present invention, comprising the following steps:
  • a method according to the invention brings about the same inventive functionality as a turning device according to the invention, so that the same advantages are achieved as have been explained in detail with reference to a turning device according to the invention.
  • blowing head according to the invention and / or the corresponding turning device can also be used in other extrusion systems, for example in a film extrusion, in particular in a flat film extrusion.
  • the blow head can basically be designed as an extrusion head.
  • Fig. 1 is a schematic representation during a rinsing process in known
  • Fig. 2 shows the situation of FIG. 1 when using an inventive
  • Turning device, 3 is a schematic representation of the effect of a turning device according to the invention.
  • FIG. 5 shows a further embodiment of a turning device according to the invention
  • FIG. 6 shows an embodiment of a turning device according to the invention
  • FIG. 7 shows a further embodiment of a turning device according to the invention
  • FIG. 8 shows the embodiment of FIG. 8 in a multiple arrangement
  • FIG. 9 shows a further embodiment of a turning device according to the invention.
  • FIG. 10 shows a further embodiment of a turning device according to the invention
  • FIG. 1 the embodiment of FIG. 10 in a further view
  • Fig. 12 shows an embodiment of a Blaskopfs invention
  • Fig. 13 shows a further embodiment of a blow head according to the invention.
  • a melt channel 1 10 is shown with a flow direction from left to right, as it is during the rinsing process.
  • a free flow cross-section 70 is provided, through which melt 200 flows.
  • melt 200 flows.
  • old melt material 220 and new melt material 210 there is to be distinguished between old melt material 220 and new melt material 210.
  • a ramp-shaped or conical formation between the old melt material 220 and the new melt material 210 is formed. This cone travels to the right during the flushing time until finally most of the old melt material 220 has been applied and the active production can continue.
  • a turning device 10 according to the invention is shown.
  • FIGS. 3 and 4 show the possibility of making a switching by a division functionality available.
  • the melt 200 will be divided into two sub-channels 46 a and 46 b of the dividing section 46 via a splitting section 47.
  • completely new old melt material 220 surrounds the new melt material 210, only half of the circumference with old melt material 220 becomes due to the splitting in the sub-channels 46a and 46b be covered.
  • the other half in the sub-channels 46a and 46b is provided at the edge with already new melt material 210. If, by skillful combining, a central merging of the two subchannels 46 for the edge regions is carried out with the old enamel material 220, a complete or at least partial reorganization according to the invention can likewise be carried out by this division function.
  • Fig. 5 shows schematically a possible further embodiment of a turning device 10 with this division functionality.
  • a total of four subchannels 46a and 46b are split and recombined in a combination section 48.
  • the corresponding distribution of old melt material 220 and new melt material 210 in the corresponding channels is shown.
  • the edge portions are with the old material 220 completely centered, so that the environmental edge in the melt channel 1 10 is substantially completely formed by the new melt material 210.
  • six or more sub-channels in the context of the present invention are conceivable.
  • Fig. 6 a possibility is shown schematically how the individual turning devices 10 can communicate with each other.
  • a star-shaped division in which, starting from a central channel, a plurality of star-shaped melt channels 1 10 is divided from below.
  • Each melt channel 1 10 is equipped with a turning device 10, which has a dividing section 46.
  • each star-shaped melt channel 110 is divided into two sub-channels 46a and 46b.
  • a combination of the partial channels 46a and 46b is then carried out in associated combination sections 48.
  • the combination sections 48 connect sub-channels 46a and 46b, which have previously been split by different melt channels 110.
  • a half pitch offset in the circumferential direction with respect to the combination portions 48 can be achieved. This leads to the already particularly explained, particularly efficient combination possibility, wherein in the right part of Fig. 6, the inventive redistribution of old melt material 220 can be performed at the edge in the middle.
  • a solution is shown schematically, which includes curved dividing channels 46a and 46b. These dividing channels are formed here essentially with the same length and substantially the same curvature.
  • the dividing channels 46a and 46b of the dividing portion 46 substantially form a toroidal shape in this embodiment.
  • an acute angle is established here between the flow directions SR upstream of the dividing section 47 and after the combination section 48.
  • Schematically again the divisions or the rearrangements of the old melting material 220 with the corresponding arrow representations are recognizable.
  • 8 shows the combination of a turning device 10 in a star-shaped division, as has already been explained with reference to FIG. 7.
  • FIG. 9 shows a further solution of a turning device 10 according to the invention.
  • a deflection of the flow direction SR of the melt takes place between the splitting section 47 and the combination section 48 of approximately 90 °. This leads to the compact design, so that the substantially complete deflection of the melt 200, the combination section 48 between the sub-channels 46a and 46b can be arranged.
  • FIGS. 10 and 11 show a solution in which the individual sub-channels 46a and 46b, wherein here four sub-channels 46a and 46b are provided, are spirally intertwined with each other. This leads to a corresponding combination, which also provides a redeployment of the old melt material 220 from the edge to the center in the combination section 48.
  • a turning device 10 may be arranged. This may be any of the described embodiments of the turning device 10.
  • the blowing head 100 an annular Blasauslass 1 12.
  • FIG. 13 shows a solution similar to FIG. 12, but here a displacement device 60 for the turning device 10 is shown.
  • the turning device 10 is in the second position, and thus out of fluid-communicating engagement with the melt channel 1 10. This is the operating position.
  • the turning device 10 is introduced into the melt channel 110 via the displacement device 60 and can thus provide the functionality according to the invention for the reduction of the rinsing time.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un dispositif de retournement (10) pour le retournement d'une matière fondue (200) dans un canal (110) pour matière fondue, comprenant une entrée (20) pour la matière fondue et une sortie (30) pour la matière fondue. Au moins un moyen de guidage (40) de la matière fondue est disposé entre l'entrée (20) pour la matière fondue et la sortie (30) pour la matière fondue pour redistribuer la matière fondue (200) du centre (22) de l'entrée (20) pour la matière fondue sur le bord (34) de la sortie (30) pour la matière fondue et pour redistribuer la matière fondue (200) du bord (24) de l'entrée (20) pour la matière fondue au centre (32) de la sortie (30) pour la matière fondue.
EP15757488.0A 2014-09-03 2015-09-02 Dispositif de retournement pour le retournement d'une matière fondue et procédé de rinçage Withdrawn EP3188888A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014112712.9A DE102014112712A1 (de) 2014-09-03 2014-09-03 Wendevorrichtung für das Wenden einer Schmelze
PCT/EP2015/069997 WO2016034605A1 (fr) 2014-09-03 2015-09-02 Dispositif de retournement pour le retournement d'une matière fondue et procédé de rinçage

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EP3188888A1 true EP3188888A1 (fr) 2017-07-12

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US (1) US10576660B2 (fr)
EP (1) EP3188888A1 (fr)
CN (1) CN106660248A (fr)
CA (1) CA2960077A1 (fr)
DE (1) DE102014112712A1 (fr)
WO (1) WO2016034605A1 (fr)

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DE3245084A1 (de) * 1982-12-06 1984-06-07 Windmöller & Hölscher, 4540 Lengerich Verfahren und vorrichtung zur bildung und umschichtung von teilstroemen einer aus einer strangpresse gefoerderten kunststoffschmelze
JP2011235546A (ja) * 2010-05-11 2011-11-24 Sumitomo Chemical Co Ltd フィルム又はシートの製造装置及び製造方法

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WO2004113049A1 (fr) * 2003-06-20 2004-12-29 Battenfeld Gloucester Engineering Co., Inc. Procede de reduction de defauts de surface
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DE2428321A1 (de) * 1974-06-12 1976-01-02 Windmoeller & Hoelscher Mischvorrichtung fuer plastische, insbesondere thermoplastische oder nicht vernetzte elastomere massen
DE3245084A1 (de) * 1982-12-06 1984-06-07 Windmöller & Hölscher, 4540 Lengerich Verfahren und vorrichtung zur bildung und umschichtung von teilstroemen einer aus einer strangpresse gefoerderten kunststoffschmelze
JP2011235546A (ja) * 2010-05-11 2011-11-24 Sumitomo Chemical Co Ltd フィルム又はシートの製造装置及び製造方法

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CA2960077A1 (fr) 2016-03-10
US20170282409A1 (en) 2017-10-05
DE102014112712A1 (de) 2016-03-03
WO2016034605A1 (fr) 2016-03-10
US10576660B2 (en) 2020-03-03
CN106660248A (zh) 2017-05-10

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