GB2185931A - Extrusion die for production of co-extruded thermoplastics laminated foil tubes - Google Patents

Extrusion die for production of co-extruded thermoplastics laminated foil tubes Download PDF

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Publication number
GB2185931A
GB2185931A GB08700774A GB8700774A GB2185931A GB 2185931 A GB2185931 A GB 2185931A GB 08700774 A GB08700774 A GB 08700774A GB 8700774 A GB8700774 A GB 8700774A GB 2185931 A GB2185931 A GB 2185931A
Authority
GB
United Kingdom
Prior art keywords
tool
transport channel
layer
extrusion
core
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.)
Granted
Application number
GB08700774A
Other versions
GB8700774D0 (en
GB2185931B (en
Inventor
Willi Schnell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Reifenhaeuser GmbH and Co KG Maschinenenfabrik
Original Assignee
Reifenhaeuser GmbH and Co KG Maschinenenfabrik
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Reifenhaeuser GmbH and Co KG Maschinenenfabrik filed Critical Reifenhaeuser GmbH and Co KG Maschinenenfabrik
Publication of GB8700774D0 publication Critical patent/GB8700774D0/en
Publication of GB2185931A publication Critical patent/GB2185931A/en
Application granted granted Critical
Publication of GB2185931B publication Critical patent/GB2185931B/en
Expired legal-status Critical Current

Links

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
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/34—Cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding material and the preform to be coated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—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
    • B29C48/14—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration
    • B29C48/147—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration after the die nozzle
    • B29C48/1472—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration after the die nozzle at the die nozzle exit zone
    • 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
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • 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
    • 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
    • B29C48/3366—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 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
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/007—Using fluid under pressure
    • 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

Landscapes

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

Abstract

The die has a first section (1) with a plurality of feeding channels (2) for each of a plurality of plastics streams, and a second die section (3) with an annular mouth (4) through which the laminated plastics stream emerges in tubular form, together with a die core (5) and layer-forming device (6). The feeding channels (2) feed directly to the device (6) which opens directly into a single annular transport channel (7), which is free from core supporting studs, and which is thereby adapted as a layer-combining device, the annular mouth (4) being connected to the device (6) by an extension (8) of the channel (7), which is similarly free from core studs. The mouth (4) can be varied by replacement, or adjustment, of one of the parts (10, 11), and the wall of the transport channel is corrugated in the region (12). <IMAGE>

Description

SPECIFICATION Extrusion tool for production of multilaminated foil tubes This invention relates to an extrusion tool for the production of multilaminated foil tubes from a plurality of synthetic thermoplastics arrayed in layers during the course of co-extrusion,the extrusion press tool having a first tool section with means for feeding in a plurality of plastics streams through a plurality of feeding channels, and a second tool section with an annular mouth through which the multilaminated plastics stream emerges in tubular form, together with a tool core and layer-forming device.
The layer-forming device has constructional features which ensure that the layers are combined without intermixing. This involves the adjustment of the material streams so that the individual layers mereby bond together and no shear stresses are set up between the individual layers as a result of velocity differences orthe like.
It is self-evidentthatthetool sections are disposed symmetrically aboutthetool axis, apart from the feeding channels in the first tool section. It is further self-evidentthatthe core can incorporate a compressed air supply system, and optionally also a compressed air escape system, when the equipment is used to produce inflated foils.
In a known extrusion tool ofthistype,thefeeding channels in the first tool section each lead to a separate transport channel. The layer-forming device is diposed in the second tool section. It consists of a plurality of helical distributors equal in number to the plastics streams, nesting one inside the nextand connected individuallytothepluralityof transport channels, beyond which a conically convergent channel where the actual layer-combining process is effected leads into the annular mouth. The helical distributors are so disposed because the transport channels for the various plastics streams in the second tool section are obstructed by core studs which locate and/or support the core.Disturbances in the plastics streams must be suppressed before the layer-combining process can take place, so that in this respect the helical distributors form part of the layer-forming device and thus become much more complicated and costly to produce. The operating period between stoppages is often too short, since the materials can set hard in the helical distributors.
When this happens, the nest of helical distrubutors must be taken to pieces, cleaned and put together again; this is a costly matter.
The object of the invention is to adapt an extrusion tool of the type initially described, so that a nest of numerous helical distributors is no longer required in the second tool section.
According to the present invention, the feeding channels feed directly to the layer-forming device, the layer-forming device opens directly into a single transport channel in the first tool section, which transport channel surrounds the tool core as an annular gap free from core studs, wherebythe transport channel is adapted as a layer-combining device, and the annular mouth is connected to the layer4orming device by the single transport channel extending free from core studs into the second tool section.
The invention arises from the realisation that it is unnecessary to locate the layer-forming device just behind the annular mouth in the second section of an extrusion tool of the type first described. If the layer-forming device is located in the first tool section, and the arrangements are otherwise as specified, it is surprising buttrue that no intermixing whatever takes place as the multilaminated plastics stream advances from the layer-forming device to the annular mouth. The invention also makes use of the fact that no core studs are required to hold or locate the tool core, provided the feeding channels open into a single transport channel, free from core studs.
It can be advantageous to adjust the gap width in the annular mouth in the extrusion tool of the invention to the specific operating conditions and the nature of the plastics materials used.
Accordingly, the annular mouth preferably forms the mouth of a conical portion of the transport channel in the second tool section, disposed between an inner nozzle component and an outer nozzle component, and the width of the annular mouth can be varied by displacing or replacing at least one ofthe nozzle components.
Adjustments can be made without halting production and broughtunderautomaticcontrol. In orderto ensurethatthe properties remain uniform all round the perimeter of the foil tube, thetransport channel wall upstream of the conical branch, as seen in the direction of material flow, has substantially circumferentially disposed corrugations.
The accruing advantages are to be seen in thatthe extrusion tool of the invention makes it very easy to produce multilaminated foil tubes from a very wide rangeofthermoplasticssynthetic materials without having to use a nest of helical distributors.
Moreover, the extrusion tool can be produced by simple means involving no great expense.
An embodiment of the invention will now be described, by way of example only, with reference to the accompanying drawing, which is an axial section through that half of an extrusion tool of the invention that containsthe feeding channels.
The extrusion tool shown in the drawing is designed for the production of multilaminated foil tubes from a plurality of synthetic thermo plastics arrayed in layers during the course of co-extrusion.
Its basic construction comprises afirsttool section 1 with meansforfeeding in a plurality of plastics streams through a plurality of feeding channels 2, a second tool section 3 with an annular mouth 4 through which the multilaminated plastics stream emerges in tubularform, a tool core 5, and a layer-forming device 6.
The feeding channels 2 open into a portion 7 of a single transport channel in the firsttool section 1, which channel portion surrounds the tool core as an annular gap free from core studs. Thus this transport channel is adapted as a layer-combining device which ensures that the material streams bond together. The dimensions are carefully adjusted so that shear stresses between the individual layers, resulting from velocity differences orthe like are completely excluded. The annular mouth 4is connected to the layer-forming device 6 by the single transport channel which has a portion 8 extending free from core studs and disposed in the second tool section.
Theannularmouth4formsthemouthofaconical portion 9 ofthetransportchannel 7,8 in the second tool section 3, disposed between an inner nozzle component 10 and an outer nozzle component 11.
Consequently, the width of the annular mouth 4 can be varied by displacing or replacing at least one of the nozzle components 10, 11. Upstream of the conical portion 9 of the transport channel 7, 8, as seen in the direction of flow ofthe multilaminated plastics stream,the wall of the transport channel has substantially circumferentially disposed corrugations 1 2.

Claims (4)

1. An extrusion tool for the production of multilaminated foil tubes from a plurality of syntheticthermoplastics arrayed in layers during the course of co-extrusion,the extrusion press tool having a first tool section with meansforfeeding in a plurality of plastics streams through a plurality of feeding channels, and a second tool section with an annular mouth through which the multilaminated plastics stream emerges in tubular form, together with a tool core and layer-forming device, wherein the feeding channels feed directly to the layer-forming device, the layer-forming device opens directly into a single transport channel in the first tool section, which transport channel surrounds the tool core as an annular gap free from core studs, whereby the transport channel is adapted as a layer-combining device, and the annular mouth is connected to the layer-forming device by the single transport channel extending free from core studs into the second tool section.
2. An extrusion tool as in Claim 1, wherein the annular mouth forms the mouth of a conical portion of the transport channel in the second tool section, disposed between an inner nozzle component and an outer nozzle component, and the width ofthe annular mouth can be varied by displacing or replacing at least one of the nozzle components.
3. An extrusion tool as in Claim 2, wherein the wall of the transport channel upstream of the conical portion of the transport channel has substantially circumferentially disposed corrugations.
4. An extrusion tool substantially as hereinbefore described with reference to the accompanying drawing.
GB8700774A 1986-01-18 1987-01-14 Extrusion tool for production of multilaminated foil tubes Expired GB2185931B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19863601345 DE3601345A1 (en) 1986-01-18 1986-01-18 EXTRACTION TOOL FOR THE PRODUCTION OF A MULTILAYER TUBULAR FILM

Publications (3)

Publication Number Publication Date
GB8700774D0 GB8700774D0 (en) 1987-02-18
GB2185931A true GB2185931A (en) 1987-08-05
GB2185931B GB2185931B (en) 1989-11-01

Family

ID=6292096

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8700774A Expired GB2185931B (en) 1986-01-18 1987-01-14 Extrusion tool for production of multilaminated foil tubes

Country Status (10)

Country Link
BE (1) BE1001610A4 (en)
DD (1) DD253216A5 (en)
DE (1) DE3601345A1 (en)
FI (1) FI870132A (en)
FR (1) FR2593112B1 (en)
GB (1) GB2185931B (en)
IT (1) IT1201161B (en)
NL (1) NL8700104A (en)
NO (1) NO870158L (en)
SE (1) SE8700129L (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5035596A (en) * 1987-06-22 1991-07-30 Bekum Maschinenfabriken Gmbh Coextrusion head
US7264836B2 (en) 2003-03-21 2007-09-04 Kraft Foods Holdings, Inc. Production of triple coextruded baked bar goods
US7470119B2 (en) 2004-05-18 2008-12-30 Wm. Wrighley Jr. Company Confection center fill apparatus and method
US9868244B2 (en) 2011-07-20 2018-01-16 Plastika Kritis S.A. Concentric co-extrusion die for extruding a multilayer thermoplastic film

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9216920U1 (en) * 1992-10-13 1994-02-24 Windmoeller & Hoelscher Extrusion tool for the extrusion of melt hoses
DE102004001473B4 (en) * 2003-11-10 2006-05-11 Kuhne Gmbh Film die
DE102008014342A1 (en) * 2008-03-14 2009-10-01 Roga Kg Method for the production of tube like foil by extrusion, comprises decelerating and then accelerating flow speed of a coextrudate within an extrusion nozzle

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB932157A (en) * 1961-01-04 1963-07-24 Franklin Resi I Ment Corp Extruder head for forming hollow plastic products
GB1067908A (en) * 1964-10-02 1967-05-03 Dow Chemical Co Extrusion die
GB1227914A (en) * 1968-04-26 1971-04-15
GB1347772A (en) * 1970-03-31 1974-02-27 Nat Distillers Chemical Corp Co-extrusion die
GB1436907A (en) * 1973-06-27 1976-05-26 Crown Zellerbach Corp Method of and apparatus for forming blown laminar film

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3337914A (en) * 1966-01-03 1967-08-29 Nat Distillers Chem Corp Stacked extrusion die
CA904525A (en) * 1969-03-29 1972-07-11 Leco Industries Limited Co-extrusion device
US3890083A (en) * 1973-05-30 1975-06-17 Leco Industries Ltd Extrusion devices
DE2752932A1 (en) * 1977-11-26 1979-05-31 Reifenhaeuser Kg RING SPLITTING TOOL FOR EXTRUSION OF THERMOPLASTIC PLASTIC
JPS5624133A (en) * 1979-08-07 1981-03-07 Asahi Chem Ind Co Ltd Molding die
FR2503627A1 (en) * 1981-04-09 1982-10-15 Raffinage Cie Francaise HEAD FOR EXTRUSION OF A TUBULAR PARAISON TO AT LEAST ONE LAYER OF MATERIAL
DE3277113D1 (en) * 1981-10-05 1987-10-08 Ball Corp Multilayer tubular body with uncentered barrier layer
FR2557016A2 (en) * 1983-12-23 1985-06-28 Raffinage Cie Francaise HEAD FOR EXTRUSION OF A TUBULAR PARAISON TO AT LEAST ONE LAYER OF POLYMERIC MATERIAL
US4649004A (en) * 1983-12-27 1987-03-10 Toyo Seikan Kaisha, Ltd. Process for production of multi-layer pipes for draw-forming

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB932157A (en) * 1961-01-04 1963-07-24 Franklin Resi I Ment Corp Extruder head for forming hollow plastic products
GB1067908A (en) * 1964-10-02 1967-05-03 Dow Chemical Co Extrusion die
GB1227914A (en) * 1968-04-26 1971-04-15
GB1347772A (en) * 1970-03-31 1974-02-27 Nat Distillers Chemical Corp Co-extrusion die
GB1436907A (en) * 1973-06-27 1976-05-26 Crown Zellerbach Corp Method of and apparatus for forming blown laminar film

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5035596A (en) * 1987-06-22 1991-07-30 Bekum Maschinenfabriken Gmbh Coextrusion head
US7264836B2 (en) 2003-03-21 2007-09-04 Kraft Foods Holdings, Inc. Production of triple coextruded baked bar goods
US7470119B2 (en) 2004-05-18 2008-12-30 Wm. Wrighley Jr. Company Confection center fill apparatus and method
US9868244B2 (en) 2011-07-20 2018-01-16 Plastika Kritis S.A. Concentric co-extrusion die for extruding a multilayer thermoplastic film

Also Published As

Publication number Publication date
SE8700129L (en) 1987-07-19
IT1201161B (en) 1989-01-27
GB8700774D0 (en) 1987-02-18
IT8719103A0 (en) 1987-01-16
DE3601345A1 (en) 1987-07-23
NL8700104A (en) 1987-08-17
DD253216A5 (en) 1988-01-13
FI870132A (en) 1987-07-19
BE1001610A4 (en) 1989-12-19
NO870158D0 (en) 1987-01-15
FR2593112A1 (en) 1987-07-24
FI870132A0 (en) 1987-01-14
FR2593112B1 (en) 1990-06-08
GB2185931B (en) 1989-11-01
SE8700129D0 (en) 1987-01-15
NO870158L (en) 1987-07-20

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PCNP Patent ceased through non-payment of renewal fee