WO2013113305A1 - Distributeur hélicoïdal, tête de soufflage, installation de film de soufflage, procédé de fabrication d'un film de soufflage et film de soufflage - Google Patents

Distributeur hélicoïdal, tête de soufflage, installation de film de soufflage, procédé de fabrication d'un film de soufflage et film de soufflage Download PDF

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Publication number
WO2013113305A1
WO2013113305A1 PCT/DE2013/000052 DE2013000052W WO2013113305A1 WO 2013113305 A1 WO2013113305 A1 WO 2013113305A1 DE 2013000052 W DE2013000052 W DE 2013000052W WO 2013113305 A1 WO2013113305 A1 WO 2013113305A1
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WO
WIPO (PCT)
Prior art keywords
section
helical
spiral
channel
channels
Prior art date
Application number
PCT/DE2013/000052
Other languages
German (de)
English (en)
Inventor
Edgar Gandelheidt
Original Assignee
Reifenhäuser GmbH & Co. KG Maschinenfabrik
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 Reifenhäuser GmbH & Co. KG Maschinenfabrik filed Critical Reifenhäuser GmbH & Co. KG Maschinenfabrik
Priority to DE112013000756.8T priority Critical patent/DE112013000756A5/de
Publication of WO2013113305A1 publication Critical patent/WO2013113305A1/fr

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Classifications

    • 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
    • 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
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/335—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles
    • B29C48/336—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging one by one down streams in the die
    • B29C48/3363—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging one by one down streams in the die using a layered die, e.g. stacked discs
    • 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
    • B29C48/335—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles
    • B29C48/337—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging at a common location
    • B29C48/338—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging at a common location using a die with concentric parts, e.g. rings, cylinders
    • 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
    • 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
    • B29C48/254—Sealing means
    • 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
    • B29C48/272—Cleaning; Purging; Avoiding contamination of 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
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation

Definitions

  • the invention relates to a helical distributor for a blowing head of a film extrusion line, to a blowing head for such a blown film line, to a blown film line, to a method for producing a blown film and to a blown film produced by this method.
  • the die is the extrusion tool and thus the technological core of a blown film extrusion line, also referred to as a blown film line. Regardless of its specific design, the task of the blow head is to form the melt.
  • the melt reaches the die of one or more melt strands at the tool inlet and is to leave the die with a uniform, thermally and mechanically homogeneous melt distribution over the annular gap-shaped outlet cross-section downstream of the tool exit.
  • blowing heads commonly used today can be roughly divided into two groups: on the one hand the group of spiral distributors in cylindrical or conical form, on the other hand the group of radial spiral distributors, which are also called spiral distributors.
  • DE 103 60 360 A1 shows a blowing head for a nine-layer film.
  • DE 199 24 540 C1 discloses an axial spiral distributor with a cylindrical spiral carrier and a surrounding smooth counter-body.
  • US Pat. No. 6,866,498 B2 shows a cone coil distributor in which outlets from a predistributor initially lead into supply grooves pivoted. Each supply groove has an end region in which it closes. The melt is thereby forced into a downstream starting spiral channel. The spiral channels on the spiral carrier run linearly in the development. The mating body is smooth.
  • melt stream delivered by the extruder is first divided into several individual streams.
  • the individual streams are brought together as seamlessly as possible by means of a spiral distributor.
  • a spiral distributor For this purpose, predominantly star and ring-shaped distribution systems are used.
  • pre-distributors open into the helical channels, which are incorporated in a helical carrier.
  • a helical carrier In the case of an axial, that is to say cylindrical or conical, spiral distributor, a helical carrier is a central and / or a surrounding body.
  • the spiral carrier has the shape of one or two plates.
  • the helical channels rotate around the helical carrier in the form of a multiple thread or are arranged on the plate in the form of a multiple spiral.
  • Blowing heads for multi-layer film hoses have several spiral distributors.
  • US Pat. No. 3,809,515 discloses radial spiral distributors with three different geometries:
  • the spiral channels on the plate-shaped spiral carrier are each opposite a helical channel in the plate-shaped counterbody, thereby resulting in a circular cross-sectional shape over the spiral distributor length, whereby a circular cross-section in an expanded understanding also includes the lens shape which lies opposite the spiral
  • the two helical channels beginning opposite each other should have a different pitch, so that the overlap shifts immediately from the beginning of the helical channels cross section over the channel length is steady, so that in a radial section (see. FIG. 10 of US Pat. No. 3,809,515), the offset between upper and lower partial cross section grows uniformly from ring to ring.
  • double spiral channels are
  • EP 1 426 163 A2 discloses different shapes and arrangements for the helical channel in the mandrel-shaped helical carrier opposite spirals in the counter-body.
  • the invention has for its object to provide an improved coil distributor available.
  • this object is achieved by a helical distributor for a die of a film extrusion line having a central axis extending in the blowing direction and an extrusion direction parallel to the central axis in the case of an axial helix splitter in the case of a radial spiral - Deliverteilers radially and in the case of a conical coil distributor projected onto the axis, all around the distribution channels in beginnings of helical channels open, wherein the helical channels extend at an angle to the extrusion direction, so that a first helical channel starts at a beginning, after an initial section a second, directly adjacent Spiral passage downstream passes at the beginning and continues in its further section downstream of the beginning portion and the further portion, so that in the course of the first helical passage beyond a sealing against overflow sealing edge in the operation of Blaskopfes emerging from the second spiral channel melt can flow over the downstream lying further portion of
  • the prior art has not been able to achieve a clean melt flow starting from the initial section of the spiral channels, especially when changing the melt, for example, the color or even the melt composition can be changed.
  • the spiral channels usually have a cross section in which there is no ideal flow.
  • a flow dead zone is formed, which requires a considerable amount of flushing if another melt is to be processed.
  • a D-cross-sectional shape is present when the counterbody is smooth and a channel is provided in the surface on the side of the helical beam, with a chord and arcuate cross section, with the chord as towards the opposite body directed open end of the spiral channel and with some kind of arched line, which has at its two impact points on the tendon in each case a maximum of 90 ° relative to the tendon.
  • the zone on the spiral distributor, in which the channels of the predistributor are guided to the mouth in the beginnings of the spiral channels of the spiral distributor, is usually referred to as "gusset area" or "gusset zone".
  • the pre-distributor channels are designed as closed channels because of the sealing fit between helical carrier and counterbody.
  • the gusset zone usually runs with a zigzag-shaped contour around the helical girder is usually geometrically defined by two edges of the sealing fit.
  • edge there is initially a predominantly horizontally extending longer edge between the helical channel and the usually smooth outer peripheral surface of the helical support, along the upstream edge of the helical channel.
  • This edge extends as an edge of the helical channel approximately from its beginning to about the beginning of the overlay with the seen in the direction of rotation of the helical channel adjacent helical channel. In the wording of the present application, this edge thus extends over the "initial section" of the helical channel.
  • the horizontally extending edge forms a corner in the cross-section with the usually smooth outer periphery of the cantilever beam - cut perpendicular to the direction of travel of the helix channel. In this corner are significantly lower wall shear stresses than in the round areas of the spiral channel cross section. As a result, a comparatively long residence time of the melt occurs in this area.
  • there is a predominantly vertically extending edge which extends in the axial direction in the region of the beginning of the overlap between the first and the second helical channel, which, viewed in the direction of rotation of the first helical channel, is immediately adjacent to the first helical channel. The beginning of the overlap is in the above-selected wording the "transition section" of the first helical channel, ie the region in which the initial section of the first helical channel merges into the further section of the first helical channel.
  • the vertical edge forms the boundary of the flow channel at the beginning of the overflow web between the two aforementioned coils.
  • the volume flow which flows in the region of the vertical edge over this web between the two coils, is low and is additionally delayed by the vertical edge itself.
  • significantly lower wall shear stresses exist in the area of the vertical edge than in the remaining areas of the overflow web between the spiral channels. Also in this area, therefore, comparatively long residence times of the melt occur.
  • the two abovementioned edges are found in the radial direction or in the circumferential direction of the helical carrier plate.
  • the geometric design of the gusset region according to the prior art, in particular the geometry of the two edges, as a result of the wall adhesion of the melt leads to respectively significantly longer residence times and consequently to an inhomogeneous film structure.
  • the corresponding imperfections are often referred to as "helical strips”.
  • the long residence times mean, inter alia, a comparatively long rinsing time for changes in the formulation, in particular when changing the color.
  • the invention proposed here solves the problem of the starting sections in general in that the helical channels in the initial zone, that is to say in the section in which the helical channels are not overflowed by upstream sections of other helical channels, are given a round cross section.
  • cross-section is to be understood as the surface which is visible in a section perpendicular to the axis of the helical channel.
  • the helical channel with a D-shaped cross-section has a shape in which the straight side of the cross-sectional shape - ie the chord spanning the open surface of the helical channel, which essentially continues the smooth surface of the helical support - is directed towards the counter body, usually too This is essentially parallel, while the round side of the turning channel cross section runs in the body of the coil carrier.
  • round cross section means that a rounding occurs at the upstream sole course of the helical channel.
  • the spiral channel cross section can continue outside the coil carrier, especially in the counterpart body. Namely, in the prototype experiments of the inventor, it has been found that the juxtaposition of the extrusion upstream channel edge of the helical channel and a counterpart counterparts brings significant advantages.
  • at least one channel edge each of the helical carrier-side helix channel and of the helical channel lying in the opposite body face each other.
  • the spiral channel can have a curved line, which forms an obtuse angle with the chord when hitting the chord, ie an angle greater than 90 °, preferably over 120 ° or 135 °, but smaller than 180 °.
  • the curved line can continue over an intermediate part or run in a one-part spiral carrier.
  • the "blowing direction" should be the direction in which a system would blow out the film in the form of a hose when using the spiral distributor, ie normally it will be perpendicular to the plane of the annular gap A vertical upward direction, because now blown against gravity and withdrawn.
  • the central axis which runs in the blowing direction, even eponymous ,
  • the plate will lie horizontally.
  • the melt stream passes either from the outside to the inside or from the inside to the outside, but is in any case deflected to blow out. There, the blowing direction is thus also vertical, ie perpendicular to the plate of the radial spiral distributor.
  • the "direction of extrusion” is a fictitious direction: it is more than questionable whether every single particle in the flowing melt will actually flow exactly in the direction of extrusion, so that the direction of extrusion should be understood as a purely geometrical, theoretical direction.
  • the direction of extrusion refers to the desired main direction within the spiral distributor, which is often referred to as the distributor flow direction, but the actual flow in the annular gap does not exactly follow the theoretical extrusion direction.
  • the extrusion direction is to be understood as a virtual flow direction. It is defined here only to describe the angular tilt of the melt channels, uniform for axial and radial spiral distributors.
  • the "gusset zone” is the area in which outlets for the melt streams are arranged at the spiral distributor, so that the melt reaches the actual helix area through the outlets of the predistributor, ie through the pre-distributor orifices, divided into many small flows no overflow of the melt in the extrusion direction out of the helical channels planned out, but rather the gusset area seals against an overflow.
  • the "start" of the helical channels is understood to mean, in particular, that point from which the helical channel runs at least substantially in its direction in the further section and / or in the initial section Here, in one embodiment, there is a difference between these two directions.
  • the "beginning" of a helix channel can also be understood by that point in the channel progression from which the distribution channel no longer feeds several helical channels but only one helix channel.
  • angle is an angle between 0 ° and 90 °, ie an acute angle.
  • the angle is measured locally relative to a radial jet.
  • downstream refers to a point that is further in the direction of the extrusion direction than an upstream point.
  • the design of the spiral distributor has been changed, which has an advantageous effect on the system up to the quality of the film produced.
  • the presented spiral distributor can be produced very inexpensively.
  • the bottom line is a previously unachieved ratio of low technical complexity of the film extrusion line to high film quality.
  • the invention differs from EP 1 426 163 A2 in that in its first embodiment - by chance when pursuing another target - this document has an axial spiral distributor over the entire height profile of the spiral distributor, ie both in the initial zone and without any change in the overflow zone, D-shaped spiral channels also in the outer counter body arranges. Although it achieves a round cross section for the spiral channels even in the initial zone, it is considerably more complicated and cost-intensive to produce than the invention presented here. She obviously did not recognize the technical effect.
  • spiral channels in the counter-body with a different profile are disclosed as the spiral channels in the coil carrier.
  • the document thus teaches no Wendelkanal- "profile with circular cross-section", but only a singular point with circular cross section at the very beginning of the helical channels.
  • the circular cross section ends earlier than the first helical channel ends, in particular in an expiring manner.
  • the first spiral channel has from the passing of the sealing end edge of a certain length, namely the addition of an initial section plus its other section.
  • the purpose of the possible embodiment feature presented here is that the helical channel gives up its round cross-section before the end of the course of the further segment.
  • the circular cross-section can be converted into a different cross-section, in particular in a soft or in a step-like transition, for example in the conventionally known and most commonly used D-shaped cross section. The earlier the round cross section ends before the end of the first helical channel, the more cost-effective the helix distributor can be produced.
  • An embodiment provides that after entering the helical channel in the overflow zone, ie after passing the sealing end edge to the adjacent helical channel, a helix in the counter body is terminated, so either ends gradually or soft, so that the cross section of the helical channel on the Cross section in the spiral carrier reduced, whereas in the initial section, the cross section had added on the one hand from the channel profile in the coil carrier and on the other hand from the channel profile in the counter body.
  • the conventional D-shape of the helical channel can be maintained unchanged in such a case, while only the counter-body is designed so that it has milled over the course of the initial zone helices, which in the overflow zone leak or suddenly stop.
  • the counter-body is designed so that it has milled over the course of the initial zone helices, which in the overflow zone leak or suddenly stop.
  • the present invention means that a significant part, preferably the majority, of the initial section of the spiral distributor should be shaped in this way, in particular at least three quarters of the course, especially the entire course and / or should already be so designed directly at the beginning of the beginning section.
  • the stated object solves a helix distributor for a die of a sheet extrusion line, with a central axis extending in the blowing direction and with an extrusion direction parallel to the central axis in the case of an axial spiral distributor, in the case a Radial spiral distributor is projected radially and in the case of a cone coil distributor on the axis projectile, all around predispensing channels in beginnings of helical channels, the helical channels extend at an angle to the extrusion direction, so that a first helical channel starts at a beginning, after a start portion a second, directly adjacent Wendelkanal downstream passes at the beginning and continues in a further section downstream of the initial section and the further section, so that in the course of the first helical channel beyond a sealing against overflow sealing edge in Be operation of the blow head emerging from the second helical channel melt can flow over the downstream further portion of the first helical channel in the extrusion direction, so that the We
  • the counter-body spiral channel runs opposite the first spiral channel in the counter-body. This is the case in particular when the counterbody spiral channel is opposite the spiral channel over its entire length. In the case of a projection of the counterbody spiral channel onto the spiral channel, at least a slight overlap results, preferably the same overlap or even a congruence of cover everywhere.
  • the counterbody spiral channel with the first helical channel preferably forms a round cross section, in particular a circular cross section.
  • the circular cross-section has been found in the experiments of the inventor as a very good cross-sectional shape.
  • a circular cross-section should be understood in particular to mean that the cross-section at the upstream entry, ie at the transition edge from the helical channel profile to the helical carrier surface, results in an approximate or even precise circular shape, be it the exact arrangement of the two profiles relative to one another or be it deviating from the ideal circular shape by an offset in the width of the remaining slot between them, which leads to the Ringschlitzdüse.
  • a round cross section is composed of two partial round partial cross sections, whereby the two partial cross sections may in particular consist of two semicircular partial cross sections and be provided on the one hand by the helical carrier side part of the helical channel, on the other hand by the part of the helical channel formed by the counterbody ,
  • the first helical channel may already have a round cross-section at its beginning. It has already been explained that the first helical channel preferably has the round cross-section at the beginning of its starting section, that is to say downstream of that edge which terminates the sealing gusset region.
  • the first helical channel has a round cross section over the entire starting section.
  • the circular cross section can end, in particular leak. There, the complicated to be constructed geometry of the circular cross section for the achievable film quality is no longer required to the extent as in the initial section, so viewed on Blaskopf answersstäben in the initial zone.
  • two helical channels are each formed as described above in the initial zone, ie have an opposite, associated helix and / or have a circular cross-section.
  • the indefinite number word "a” should not be understood as a restrictive provision, in the sense of "exactly one”. Rather, each number statement always means that this number should be understood as a minimum specification, unless it is clear from the respective context that there just “exactly” the specified numerical value should be present.
  • the helical channel assumes a D-shaped cross section in the overflow zone.
  • Such a channel profile shape is easy to manufacture and has proven itself many times in the market.
  • the helical distributor at the beginning, in the starting section and / or in a transition section of a helical channel has a melt overflow advantage so that, in operation, a blowing head of the second helix - Channel exiting melt an overflow bridge in the distribution flow direction to the downstream lying first helical channel supports overflowed.
  • a blowing head of the second helix - Channel exiting melt an overflow bridge in the distribution flow direction to the downstream lying first helical channel supports overflowed can be found in DE 10 2010 023 203 A.
  • overflow advantage should be understood as meaning any means rather locally, ie not uniformly extending over the entire length of the helical channel, which means that the flow velocity of the melt in the critical regions is increased, ie in particular the overflow is increased measures are conceivable which reduce the flow resistance for the overflow path or which increase the flow resistance for the channel flow.
  • a helical channel with respect to a course in its transition section on a bend, a curve or a pivoting which may lead, with a suitable design, that an otherwise poorly flushed vertical edge is better flushed. It can also be achieved with a suitable design that a greater amount of melt exits the helical channel and runs downstream via the overflow web.
  • FIG. 1 shows a cylindrical, partially sectioned schematic view of a cylindrical axial spiral distributor according to the prior art
  • FIG. 2 shows schematically in a radial section one half of a spiral spiral distributor according to the prior art, in which melt is fed radially outwards into helical channels,
  • FIG. 3 shows a development according to the prior art
  • FIG. 4 schematically shows, in a section perpendicular to a helix passage, a first exemplary embodiment for its round cross section, wherein the helical channel is composed of a part running in a helical carrier and a helix in a counterbody over an entire length of an initial zone;
  • FIG. 5 is a schematic section through a section perpendicular to a helix passage, showing a second embodiment of a circular cross section;
  • FIG. 6 schematically, in a section perpendicular to a spiral channel course, a third exemplary embodiment for a round cross section
  • FIG. 7 schematically, in a section perpendicular to a spiral channel course, in analogous representation to FIGS. 5 and 6, three examples of D-shaped cross sections from the prior art
  • the spiral distributor 1 in FIG. 1 is constructed according to the prior art. It consists essentially of a central mandrel designed as a coil carrier 2, which is surrounded by a jacket-shaped counter body 3.
  • the melt stream supplied by an extruder (not shown) is first divided into a plurality of individual streams in a pre-distributor (hidden by an outer surface not shown in section), which open into helical channels. These are incorporated into the spiral carrier 2 and circulate in the form of a multiple thread.
  • a central axis 4 is coaxial with an annular outlet nozzle 5 at a downstream end 6 of the spiral distributor 1.
  • the helical channels 8, 9 extend from beginnings 14 (identified by way of example, hidden from the surface 21) Beginning sections 15 (identified by way of example, shown there completely) to transition sections 16 (identified by way of example) and continuous further in further sections 17 (identified by way of example).
  • gusset region 13 a plurality of regions are present with rather horizontal, lower edges 18 and vertical edges 19, 20 (exemplarily characterized) which form sealing end edges, in which melt adhesion is to be feared.
  • the radial spiral distributor 30 in FIG. 2 which is likewise constructed according to the prior art, consists essentially of a plate 31 as a helical carrier, into which spiral channels 32 (identified by way of example) are introduced, and a likewise horizontally lying counter plate 33 as a counterbody ,
  • the horizontal edges 18 and the vertical edges 19, 20 correspond to the circumference of the distributor 30 following edges (not shown) or radial edges (not shown) downstream and with tangential offset of each helical channel beginning with respect to the risk of Strömungsstot Schemeen the Radial Listelverteilers. not shown).
  • the plastic melt is conducted during operation, starting from pre-distributor channels 34, into starts 35 of the spiral channels 32.
  • a channel depth of the spiral channels 32 decreases, an overflow gap 39 becoming larger in the course of the extrusion direction 36.
  • the spiral distributor 40 in FIG. 3 which is an embodiment of the invention, the course geometry of the helical channels 41, 42, 43, 44, 45 was intervened:
  • outlets 46, 47, 48 on cylindrical Axial Listelverteiler 40 are found outlets 46, 47, 48 on cylindrical Axial Listelverteiler 40. These open into feed sections 49, 50, 51, wherein each two feed sections 50, 51 are curved in pairs to each other, thus in the spiral distributor 40th arranged pre-distribution channels can be performed more compact.
  • the mouth sections 49, 50, 51 are very short and extend only until the helical channels 41, 42, 43, 44, 45 have the same geometry. There is at beginnings 52, 53, 54 each have a first deflection, namely by just less than 90 °. The angle may be, for example, about 85 °.
  • the helical channels 41, 42, 43, 44, 45 extend straight along their initial sections 56, 57, 58 until they are projected downstream, ie further projected onto the manifold flow direction 55, from the initial sections 52, 53, 54 immediately adjacent helical channels 42, 43, 44, 45 are located. There they have double pivoting 59, 60, 61, which, however, do not lead to a parallel continuation of the spiral channels 41, 42, 43, 44, 45, but with a slight pivoting towards a larger slope in further sections 62, 63 , 64, 65. In the further sections 62,
  • the vertical edges 66, 67, 68 are significantly shorter than in the prior art as a result of the initially flat slope into the initial section 56, 57, 58.
  • the relatively short vertical edges 66, 67, 68 define the beginning of overflow webs 69 (identified by way of example). These are initially very short in the overflow direction, which is parallel to the extrusion direction 55. Here, therefore, can set a large volume flow of the melt.
  • the overflow web 69 is larger at the next overlap with the next starting spiral channel and assumes a constant width 70 (indicated by way of example). This is advantageous for a good distribution of the melt.
  • the helical channel rises only after the vertical edges 66, 67, 68 briefly with a greater pitch and then goes over in a constant greater slope with respect to the initial section.
  • the vertical edges 66, 67, 68 briefly with a greater pitch and then goes over in a constant greater slope with respect to the initial section.
  • the spiral channel 100 in FIG. 4 is formed inside the mandrel side by a first channel-like recess 101 on a coil carrier 102 of a blow head and provides with its C-shape (shown crossed) represents almost a typical formation of a spiral channel with D-shaped cross-section.
  • the "start section” extends, and from there on, the helical passages 100 are no longer closed to the downstream side, but allow the melt to enter the downstream transition edges 103a, 103b in the extrusion direction 104 into a ring slot 105.
  • the annular slot 105 is formed toward the radially inner side by a helical support surface 106 and toward a radially outer side from a mating body surface 107. Both are substantially cylindrically shaped. Mating body surface 107 surrounds helical support surface 106. It is ideally positioned so close that there is no offset 1 12, although the offset 1 12 is usually observed in practice, in any case when the coil carrier is heated.
  • the illustrated gusset zone 108 is followed by the initial zone, within the initial zone, which merges downstream into an overflow zone outside the range shown , is as w Eiterer part of the helical channel 100 in a counter body 109 a coil 1 10 introduced, for example milled.
  • the ring slot 105 is defined by its dimension 105' as the sum of the dimension 108 "of the return of the vertical sealing end edge 108 ' to offset 1 12. Since the offset is ideally zero, the ring slot dimension 105 'is about the same as the return measure 108 ".
  • the helix 1 10 runs congruently opposite a helical carrier-side part 11 of the helical channel 100. Together with the wendeluter dust part 1 1 1 of the helical channel 100, the helix 1 10 thus forms a total circular cross-section helical channel 100.
  • Both profiles are each C-shaped, mirror-inverted, and additionally in the example chosen here each exactly semicircular ,
  • the two profile parts thus form an exactly circular cross-section, with an offset 1 12 of ideally zero.
  • the second embodiment 120 for a circular cross-section provides on one side a spiral channel 121 in a coil carrier 122, which may be constructed as a cylindrical mandrel.
  • the helical support 122 is arranged opposite a mating body 123, so that a helical support surface 124 and a mating body surface 125 close to each other upstream of the helical passage 121 in the initial section (shown).
  • the helical carrier surface 124 is set back by a recess 126 and has thus cleared a ring slot 127 for overflowing melt in the direction of the annular nozzle (not shown).
  • the helical channel 121 Downstream of the initial section of the helical channel 121 are in spiral holder 122 more helical channels (not shown) with their other sections. They are also overflowed from emerging from the initial portion of the helical channel 121, via a downstream edge 128 overflowing melt.
  • the helical channel 121 In cross-section, the helical channel 121 is a circular cross-section, because it is made at an upstream channel bottom 129 free of projections and thus continuous.
  • an arcuate line 130 of its cross-section meets at its upstream end at an obtuse angle 131 on a chord 132. In the present example, the obtuse angle 131 is about 150 °.
  • the helical channel 121 may have been produced, for example, with a tilted axis ball cutter 133.
  • the helical channel 140 embodies a circular cross-section: On the one hand, in his sole region 141, which is upstream, a non-intermittent passage is generated, namely from a first partial line 142 to a second partial line 143. On the other hand, and independently, is also here between a chord 144 and a composite arc line 145, 146 at an impact point 147 of the arc line 145, 146 on the chord 144 an obtuse angle 148 before.
  • the D-shape cross sections 160, 161, 162 in FIG. 7 are each known from the prior art.
  • a first D-shape cross section substantially has a C-shape 163 in its arcuate line 164.
  • the arcuate line 164 strikes a chord 167 at an acute angle 166 of about 85 ° at the critical upstream edge of the helical channel.
  • an acute angle 168 is only about 50 °.
  • a more complex pre-distributor channel guide is provided on a surface 201 of a mandrel carrier 202 of an axial coil distributor as an example.
  • a first pre-distributor channel 203 is provided for guiding melt for four helical channels 204, 205, 206, 207. For this he has a feed 208 (not shown in detail).
  • a second distribution channel 210 and a third distribution channel 21 1 are provided, which are each provided only for the transport of melt for two helical channels 204, 205 and 206, 207.
  • melt After a second branching point 212, the melt can ultimately flow into the two left-hand spiral channels 204, 205. Likewise, after a third branching point 213, the melt can flow right into the two helical channels 206, 207.
  • the predistribution system shown has sealed channels, it has already been explained that in practice between the coil carrier 202 and its counter body (not shown) does not come to a perfect seal, but that a small leakage current can occur, which is the expert but still feel like a sealed pre-distributor system.
  • the course of a helical channel 206 leads from a beginning past a sealing end edge 214. From there on, a channel edge 216 upstream of an extrusion direction 215 is no longer sealed by the helical carrier surface 201 of a gusset zone 217 and thus for overflow of upstream channel melt open.
  • the upstream distribution channels are located upstream. These are closed. They lead, inter alia, into the upstream adjacent helical channel 207, so that melt from that beyond the sealing end edge 214 is overflowed via an in depth reduced overflow region 218 to the first-described spiral channel 206.
  • the overflow surface 218 is radially offset radially by the amount by which the sealing end edge 214 jumps radially inwards.
  • the radial difference between the overflow area 218 and the surface 201 in the gusset area 217, which is dense, is thus the radial thickness of the annular gap leading to the annular nozzle (not shown).
  • the first described spiral channel 206 has a downstream overflow region 219, starting with a further sealing end edge 220.
  • An initial section 221 of the turning channel 206 described here begins - exactly in the course of the spiral channel 206 starting from the predistribution system - with passing the downstream sealing end edge 220.
  • the spiral channel 206 gives melt in the extrusion direction 215 by means of overflow but is itself protected on its upstream edge 216 from overflowing from the sealing surface of the gusset portion 217.
  • the "beginning" of the helical channel 206 is where the helical channel 206 for the first time detects the finally assumed gradient direction, exit of a curvature end 221; From there, the spiral channel 206 assumes the slope with which it initially runs its initial section 221.
  • the "beginning" of the helical channel 206 is directly at the third branching point 213 because there is no pre-distributor from there, because from there it is no longer fed into several helical channels, but only in a single spiral channel.
  • the development detail 230 in FIG. 9 is intended to pick and describe an exemplary first helical channel 231 which is sealed in the gusset region 232 to the downstream direction 233 opposite a downstream adjacent channel 234, then has its start portion 236 after passing a downstream sealing end edge 235 after passing through a beginning 237 of a directly adjacent, upstream second helical channel 238 downstream of its initial section 239 in its further section 240 on.
  • the first helical channel 231 has, similar to its beginning 241 of the initial portion 236, a circular cross-section in any configuration (preferably as described above in exemplary possible cross-sectional shapes). From there, the first helical channel 231 has a profile with a length 242 with the same round cross section or, for example, with a changed round cross section, but with a circular cross section over the entire length 242.
  • the first helical channel 231 also continues to extend continuously until it enters the further section downstream of the beginning 237 of the adjacent, second helical channel 238.
  • the first helical channel 231 can either have a round cross section or have no round cross section or in some cases have a round cross section.
  • the first helical channel 23 1 thus has a development: first, it has - during the length 242 - a circular cross-section; then, however, no longer, wherein the first helical channel 231 later in the course in the initial zone, ie beyond the length 242, deviates from a circular cross-section.
  • a profile with a circular cross-section extends in a region of the first helical channel which is already downstream of the second, immediately adjacent helix channel, thus quite close to the end of the initial section of the first Wendelkanals zoom.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne des installations d'extrusion de films utilisant des distributeurs hélicoïdaux permettant de produire une matière fondue aussi homogène que possible lors d'une utilisation. Les distributeurs hélicoïdaux sont présents la plupart du temps sous la forme de distributeurs hélicoïdaux axiaux cylindriques ou coniques ou sous la forme de distributeurs hélicoïdaux radiaux. Les canaux hélicoïdaux s'étendent sur un support hélicoïdal de manière à former de multiples spirales. Selon l'invention, une spirale est disposée d'une manière déterminée sur un corps antagoniste faisant face au support hélicoïdal, et ce pour réaliser une forme de section transversale ronde, la spirale s'étendant en continu dans une partie de départ, mais se terminant dans une partie de débordement. Par ailleurs, l'invention vise à fournir une section transversale ronde déjà sur le support hélicoïdal.
PCT/DE2013/000052 2012-01-30 2013-01-30 Distributeur hélicoïdal, tête de soufflage, installation de film de soufflage, procédé de fabrication d'un film de soufflage et film de soufflage WO2013113305A1 (fr)

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DE112013000756.8T DE112013000756A5 (de) 2012-01-30 2013-01-30 Wendelverteiler, Blaskopf, Blasfolienanlage, Verfahren zum Herstellen einer Blasfolie sowie Blasfolie

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202019105681U1 (de) * 2019-10-15 2021-01-19 Kautex Maschinenbau Gmbh Extrusionstechnik zur Bildung von Kunststoff-Vorformlingen und Schlauchbildungstechnik

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WO1988001226A1 (fr) 1986-08-15 1988-02-25 Polysystem Machinery Manufacturing Inc. Filiere d'extrusion d'un film plastique souffle
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EP1116569A2 (fr) * 2000-01-14 2001-07-18 WindmÀ¶ller & Hölscher Tête d'extrusion
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EP1426163A2 (fr) 2002-12-04 2004-06-09 Reifenhäuser GmbH & Co. Maschinenfabrik Tête d'extrusion d'un film tubulaire
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DE10360360A1 (de) 2003-12-22 2005-07-28 Kiefel Extrusion Gmbh Vorrichtung zur Herstellung von Mehrschichtblasfolien aus 9 (neun) Schichten
EP1579976A1 (fr) * 2004-03-23 2005-09-28 Kiefel Extrusion GmbH Tête de soufflage avec distribution de matière fondue
DE102010023203A1 (de) 2009-06-17 2011-08-18 Robert Bosch GmbH, 70469 Greiferanordnung für Luftfahrzeug-Transfersysteme
DE102010023300A1 (de) * 2010-06-10 2011-12-15 Reifenhäuser GmbH & Co. KG Maschinenfabrik Wendelverteiler, Blaskopf, Blasfolienanlage, Verfahren zum Herstellen einer Blasfolie sowie Blasfolie

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JPS5445369A (en) * 1977-09-16 1979-04-10 Purasuchitsuku Kougaku Kenkiyu Circular die
WO1988001226A1 (fr) 1986-08-15 1988-02-25 Polysystem Machinery Manufacturing Inc. Filiere d'extrusion d'un film plastique souffle
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US5716650A (en) * 1995-04-24 1998-02-10 Black Clawson Sano Inc. Multilayer modular extrusion die
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EP1116569A2 (fr) * 2000-01-14 2001-07-18 WindmÀ¶ller & Hölscher Tête d'extrusion
US20030020205A1 (en) * 2001-07-27 2003-01-30 Davidson Randolph L. Hybrid disk-cone extrusion die module having a spillover surface surrounded by a planar seal surface
US6866498B2 (en) 2002-08-02 2005-03-15 Macro Engineering & Technology Inc. Extrusion die with supply groove transfer
DE20307412U1 (de) * 2002-12-04 2003-08-28 Reifenhaeuser Masch Werkzeug zur Extrusion eines rohrförmigen Schmelzestranges
EP1426163A2 (fr) 2002-12-04 2004-06-09 Reifenhäuser GmbH & Co. Maschinenfabrik Tête d'extrusion d'un film tubulaire
DE10360360A1 (de) 2003-12-22 2005-07-28 Kiefel Extrusion Gmbh Vorrichtung zur Herstellung von Mehrschichtblasfolien aus 9 (neun) Schichten
EP1579976A1 (fr) * 2004-03-23 2005-09-28 Kiefel Extrusion GmbH Tête de soufflage avec distribution de matière fondue
DE102010023203A1 (de) 2009-06-17 2011-08-18 Robert Bosch GmbH, 70469 Greiferanordnung für Luftfahrzeug-Transfersysteme
DE102010023300A1 (de) * 2010-06-10 2011-12-15 Reifenhäuser GmbH & Co. KG Maschinenfabrik Wendelverteiler, Blaskopf, Blasfolienanlage, Verfahren zum Herstellen einer Blasfolie sowie Blasfolie

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202019105681U1 (de) * 2019-10-15 2021-01-19 Kautex Maschinenbau Gmbh Extrusionstechnik zur Bildung von Kunststoff-Vorformlingen und Schlauchbildungstechnik

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