EP2162284A1 - Procédé et dispositif de production d'un coextrudat multicouche en matière plastique ou analogue, coextrudat obtenu et son utilisation - Google Patents

Procédé et dispositif de production d'un coextrudat multicouche en matière plastique ou analogue, coextrudat obtenu et son utilisation

Info

Publication number
EP2162284A1
EP2162284A1 EP08708760A EP08708760A EP2162284A1 EP 2162284 A1 EP2162284 A1 EP 2162284A1 EP 08708760 A EP08708760 A EP 08708760A EP 08708760 A EP08708760 A EP 08708760A EP 2162284 A1 EP2162284 A1 EP 2162284A1
Authority
EP
European Patent Office
Prior art keywords
coextrudate
layer
layers
release layer
release
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.)
Ceased
Application number
EP08708760A
Other languages
German (de)
English (en)
Inventor
Walter Günter
Michael Bauer
Kurt Stark
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.)
Loparex Germany GmbH and Co KG
Original Assignee
Huhtamaki Forchheim Zweigniederlassung der Hutamaki Deutschland GmbH and Co 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 Huhtamaki Forchheim Zweigniederlassung der Hutamaki Deutschland GmbH and Co KG filed Critical Huhtamaki Forchheim Zweigniederlassung der Hutamaki Deutschland GmbH and Co KG
Publication of EP2162284A1 publication Critical patent/EP2162284A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/06—Interconnection of layers permitting easy separation

Definitions

  • the invention relates to a method, an apparatus for producing a multilayer coextrudate from plastics or the like, the coextrudate having at least one release layer having release properties against sticky substances, the coextrudate and its use.
  • Multilayered coextrudates which have a release layer in their interior are known from the prior art.
  • the invention has the object to provide a method and an apparatus for performing the method, in which a sharp separation of
  • This object is achieved in that first a part of the layers of the composite are combined in the extrusion head.
  • first at least part of the coextrudate layers is brought together in pairs and then these pairs are connected to one another.
  • Flow rate distributions of the individual extrusion strands in itself and each other within the extrusion die is chosen low.
  • the individual materials of the coextrudate do not have at least approximately the same viscosities during coextrusion.
  • the release layer forms an outer layer of the coextrudate.
  • release layer forms an inner layer of the coextrudate.
  • release layer is located inside the coextrudate, it is protected, for example, during manufacture, and can likewise be stretched for example very easily without damage or can serve to build up more complicated structures.
  • the release layer is assigned a bonding agent layer at least on one side.
  • the release layer is adhesively bonded to the subsequent plastic layer. If no primer layer
  • the release layer and the subsequent plastic layer can be intentionally or unintentionally separated from each other.
  • a further, extremely advantageous embodiment of the invention is also present when the release layer is assigned at least one side of an adhesive layer of an extrudable adhesive.
  • a very advantageous apparatus for carrying out a method for producing a multilayer coextrudate when the extrusion head is designed so that first a part of the melt strands is combined and then successively more strands are added.
  • Such a configuration of the extrusion head ensures that the individual layers are arranged and connected side by side without disturbances.
  • This design effectively eliminates interfacial disturbances in the multilayer film made with such an extrusion head.
  • the geometry of the individual channels in the extrusion head is designed such that no turbulent flows occur in the melt strands.
  • Another very advantageous embodiment of the invention is also the fact that a plate distributor is provided for distributing the plastic materials.
  • laminar flows can be generated and turbulent flows avoided without having to accept a low production rate.
  • a very advantageous coextrudate is present if at least one plastic layer and one release layer are provided.
  • Another very advantageous embodiment is also present when an adhesive layer is provided on the second side of the release layer.
  • the second layer of plastic covers the release layer on both sides and is protected against damage.
  • the release layer can be stretched very easily together with the cover layers, whereby the thickness is reduced.
  • the plastic layers are made of an extrudable plastic material.
  • This layer structure may also comprise a basic structure, which is subsequently combined with further layers.
  • the plastic layers are made of LDPE, LLDPE, PP or the like.
  • a further very advantageous embodiment of the invention lies in the fact that ethylene acrylate copolymers, ethylene vinyl acetates, acid copolymers, polymers with acid anhydride functions, in particular provided with acid anhydrides polyethylene and polypropylene, ionomers, polymers having hydroxyl groups, in particular polyvinyl alcohols or ethylene-containing polyvinyl alcohols (EVOH) as adhesion promoter layer.
  • Copolymers of organic monomers with hydroxyl-containing monomers, in particular hydroxyethyl acrylate or hydroxypropyl, or with functional monomers grafted unfunctional polymers, in particular with OH-functional monomers grafted polymers or the like, and blends of these substances are also provided with other materials.
  • the release layers can be very well connected with other plastic layers.
  • a corresponding bonding agent can be selected.
  • Another very advantageous embodiment of the invention is also the fact that extrudable adhesives are provided.
  • Extrudable adhesives are a prerequisite for a coextrudate that includes a release layer and an adhesive layer.
  • adhesive is meant a sticky substance.
  • adhesives which are based on styrene / isoprene / styrene, styrene / butadiene / styrene (SBS), styrene / ethylene / butadiene / styrene (SEBS), bitumen, (poly) ethylene / vinyl acetate (EVA)
  • T ⁇ DATA ⁇ WORD ⁇ FOFO ⁇ Fo7313 ⁇ Fo7313PCTB odt or also polyvinyl acetate / ethylene, acrylates, based on polyurethane (PU) or on polyester.
  • thermoplastically processable silicone copolymers thermoplastics containing such silicone copolymers, silicone-containing graft copolymers, linear or branched silicone block copolymers, OrganopolysiloxanPolyharnscher or polyurethane block copolymers are provided.
  • silicone copolymers can be extruded very well both on their own or as a blend with plastic materials and still have good release properties.
  • the cover layers each have a thickness between 0.5 and 100 ⁇ m, preferably between 1 and 100 ⁇ m.
  • the release layer has a thickness between 0, 1 and 100 ⁇ m, preferably between 0.2 and 10 ⁇ m, in particular between 0.5 and 5 ⁇ m.
  • the adhesive layer has a thickness between 0.5 and 100 ⁇ m, preferably between 1 and 20 ⁇ m.
  • the adhesion promoter layer has a thickness between 0.1 and 100 ⁇ m, preferably between 0.5 and 10 ⁇ m.
  • a very advantageous use according to the invention is when the coextrudate can be used as an adhesive tape, label or the like.
  • coextrudate is provided as the basis for the formation of a hygiene article, in particular a sanitary napkin or the like.
  • the coextrudate is assigned a liquid-permeable cover layer covering the absorbent layer.
  • the release cover, adhesive layer and base layer this must be provided only with an absorbent upper layer, which can be covered if necessary with another cover layer.
  • an absorbent upper layer which can be covered if necessary with another cover layer.
  • a sanitary napkin is completed. With these few steps, the complete hygiene article is ready. The hitherto necessary elaborate manufacturing steps are considerably simplified.
  • release layer is provided as the outer layer of the coextrudate.
  • release layer is provided as the inner layer of the coextrudate.
  • An internal release layer is protected against damage during production or the film handling following the extrusion.
  • release layer can be exposed by peeling off a part of the cover layers.
  • Another very advantageous embodiment of the invention is also present when the coextrudate is stretched.
  • the figure shows
  • the goal is to avoid turbulent flows without reducing the production rate and thus to prevent disturbances in the interfaces.
  • plate distributors and horizontal spiral distributors further reduces the risk of mixing the individual layers.
  • the strands are coextruded through a coextrusion die to produce a multilayer coextrudate.
  • a multi-layer blown head for example a seven-layer blown die, with a nozzle diameter of, for example, 500 mm can be used.
  • a cooling device in particular a double-lip annulus insert can be provided, which ensures rapid cooling of the extrudate after the extrusion process and thus also prevents unwanted migration between the individual layers of the coextrudate.
  • the produced film tube is laid flat by means of brushes.
  • a pre-distribution of the melt strand By a pre-distribution of the melt strand a very high homogeneity with respect to the temperature in the melt strand is achieved. In addition, the residence times are reduced. Such a pre-distribution can be carried out in binary form.
  • Homogeneous pre-distribution ensures and maintains a narrow residence time spectrum and also a narrow temperature spectrum.
  • a homogeneous pre-distribution means the splitting of a melt stream into two equal melt streams, as indicated in the figure. There, an incoming melt strand is halved and split into two equivalent melt streams. The inevitably occurring in each melt flow velocity profile due to the friction on the walls - is at least partially equalized by the part of the melt stream with the highest speeds -in the stream - then arranged on the walls of the partial streams and slowed down.
  • a sanitary napkin can be created by adding a bibulous material and a cover layer. This sanitary napkin
  • a further seven-layer composite was produced, which is composed of three outer layers, a release layer, a primer layer and two subsequent outer layers.
  • Such composites serve to produce very thin release layers of extrudable release materials.
  • the first three outer layers serve to stabilize the composite and can later be removed from the release layer.
  • the other two outer layers are firmly connected to the release layer by means of a primer layer and therefore can not be separated therefrom.
  • Extrusion I * ⁇ assed extrusion melt pressure layer thickness temp. in 0 C bar ⁇ m temp. in 0 C bar ⁇ m
  • an extruded release layer is above all that it is very resistant together with its carrier layer and can be stretched. Conventional in the printing or coating process applied release layers often break during stretching, as they are not very durable and usually have only a weak bond to the support layer. In addition, it is possible, as already stated, not only to extrude the release layer but also to extrude an overall composite in a single work step, which may also have an adhesive layer assigned to the release layer.
  • the extrusion of the coextrudates according to the invention can be carried out on different extruders.
  • the modified extruder described above has been successfully tested as well as another modified blow extruder which successively combines the individual layers in a ring-shaped manner.
  • coextrudates are manifold. These can be used for general adhesive or adhesive products, in particular adhesive tapes, labels, hygiene articles but also for adhesive bitumen membranes or the like, especially for sealing or the like.
  • coextrudates in particular the configuration in which an adhesive fabric layer is extruded directly together with a release layer, can be used very widely.
  • Adhesive layer here means any sticky or adhesive material that is or has to be covered by a release layer.
  • the coextrudates can, as already indicated, be combined with other layers or composites.
  • thermoplastically processable silicone copolymers of all kinds are suitable and thermoplastics containing such silicone copolymers.
  • examples of such copolymers are i.a. silicone-containing graft copolymers and linear or branched silicone block copolymers.
  • organopolysiloxane polyureas are suitable for the release layer.
  • Polyurethane block copolymers which have excellent release properties and are excellent co-extrudable. Show advantages
  • ⁇ DATA ⁇ WORD ⁇ FOFO ⁇ Fo7313 ⁇ Fo7313PCTB odt R is a monovalent, optionally substituted by fluorine or chlorine
  • X is an alkylene or arylene radical having 1 to 20 carbon atoms, in which non-adjacent methylene units may be replaced by groups -O-
  • A is an oxygen atom or an amino group -NR'-
  • Z is an oxygen atom or an amino group -NR'-
  • R ' is hydrogen or an alkyl or aryl radical having 1 to 10 carbon atoms
  • Y is a bivalent, optionally substituted by fluorine or chlorine
  • Hydrocarbon radical having 1 to 20 carbon atoms W is hydrogen, a substituted or unsubstituted hydrocarbon radical or an R 2 Si-X-NH 2 radical, D is an optionally substituted by fluorine, chlorine, Cl-Cg-alkyl or Cl-Cg-alkyl ester alkylene radical or arylene radical having 1 to 700 carbon atoms, in which non-adjacent methylene units are represented by groups -O-, -COO-,
  • B is a reactive or non-reactive end group which is covalently bound to the polymer
  • n is a number of Ibis 4000
  • m is a number from 1 to 4000
  • a is a number of at least 1
  • b is a number from 0 to 40
  • C is a number from 0 to 30
  • d is a number greater than 0,
  • copolymers of the general formula (I) are suitable for the release layer:
  • X is an optionally substituted by fluorine, chlorine, Cl-Cg-alkyl or Cl-Cg-alkyl ester alkylene radical having 1 to 700 carbon atoms in which non-adjacent methylene units by groups -0-, -COO-, -OCO-, or - OCOO-, be replaced, or arylene radical having 6 to 22 carbon atoms,
  • Y is an alkylene radical having 1 to 30 carbon atoms, in which non-adjacent methylene units may be replaced by groups -O-, or an arylene radical having 6 to 22 carbon atoms,
  • Z is a divalent, optionally substituted by fluorine or chlorine hydrocarbon radical having 1 to 30 carbon atoms,
  • D represents hydrogen, a substituted or unsubstituted hydrocarbon radical or an R2Si-X-NH2 radical
  • E is an oxygen atom or an amino group -NR-
  • R is a monovalent, optionally substituted by fluorine or chlorine, hydrocarbon radical having 1 to 20 carbon atoms,
  • R 2 is hydrogen, an alkyl radical having 1 to 10 carbon atoms or a
  • Aryl radical having 6 to 22 carbon atoms, R 3 is a monovalent, optionally substituted by fluorine or chlorine
  • Hydrocarbon radical having 1 to 20 carbon atoms n is a number from 1 to 4000, r is a number of Ibis 4000, o is 1 or 2, a is a number of at least 0, b is a number greater than 0 and C is a number of at least 0,
  • Z is preferably a saturated alkylene group having up to 24 carbon atoms.
  • Y is preferably a saturated alkylene group having 1 to 3 carbon atoms, more preferably having 3 carbon atoms.
  • R is preferably an alkyl group, more preferably a methyl group.
  • D is preferably an alkyl group or a hydrogen atom, more preferably a hydrogen atom.
  • X is preferably a polyether group, more preferably one
  • E is preferably oxygen.
  • the group OR ' preferably denotes an alkoxy group, more preferably a methoxy or ethoxy group.
  • the indices r and n independently of one another preferably have an integer greater than 0, particularly preferably greater than 30.
  • the index o is preferably the number 2.
  • PSA pressure sensitive adhesives
  • the respective adhesives can be selected.
  • adhesives on other basis It is essential, however, that these are extrudable.
  • Adhesion promoters are, above all, ethylene acrylate copolymers, ethylene vinyl acetate, acid copolymers, polymers having acid anhydride functions, in particular acid-anhydride-provided polyethylene and polypropylene, ionomers, polymers having hydroxyl groups, in particular polyvinyl alcohols or ethylene-containing polyvinyl alcohols (EVOH), copolymers of organic monomers
  • T ⁇ DATA ⁇ WORD ⁇ FOFO ⁇ Fo7313 ⁇ Fo7313PCTB odt hydroxyl-containing monomers, in particular hydroxyethyl acrylate or hydroxypropyl acrylate, or with functional monomers grafted unfunctional polymers, especially grafted with OH-functional monomers polymers or the like, and blends of these substances with other materials conceivable.
  • the adhesion promoters can either be co-extruded or applied to prefabricated webs prior to extrusion.
  • cover layers any plastic material which can be extruded in film form can be provided.
  • LDPE, LLDPE and PP layers are conceivable as cover layers.
  • other, non-extrudable materials can run as a web. Therefore, there is a very wide scope of development.
  • the coextrudate can be stretched. This is not limited to a specific embodiment of the coextrudate.

Landscapes

  • Laminated Bodies (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un procédé de production d'un coextrudat multicouche en matière plastique ou analogue, le coextrudat présentant au moins une couche détachable qui possède des propriétés de détachement vis-à-vis de substances adhésives, procédé caractérisé en ce qu'on assemble en premier lieu une partie des couches du composite dans une tête d'extrusion. L'invention concerne en outre le coextrudat fabriqué selon ce procédé, ainsi que son utilisation.
EP08708760A 2007-02-06 2008-02-06 Procédé et dispositif de production d'un coextrudat multicouche en matière plastique ou analogue, coextrudat obtenu et son utilisation Ceased EP2162284A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007006648A DE102007006648A1 (de) 2007-02-06 2007-02-06 Verfahren und Vorrichtung zum Herstellen eines mehrschichtigen Coextrudates aus Kunststoffen oder dergleichen, Coextrudat und Verwendung
PCT/EP2008/051472 WO2008095967A1 (fr) 2007-02-06 2008-02-06 Procédé et dispositif de production d'un coextrudat multicouche en matière plastique ou analogue, coextrudat obtenu et son utilisation

Publications (1)

Publication Number Publication Date
EP2162284A1 true EP2162284A1 (fr) 2010-03-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP08708760A Ceased EP2162284A1 (fr) 2007-02-06 2008-02-06 Procédé et dispositif de production d'un coextrudat multicouche en matière plastique ou analogue, coextrudat obtenu et son utilisation

Country Status (3)

Country Link
EP (1) EP2162284A1 (fr)
DE (1) DE102007006648A1 (fr)
WO (1) WO2008095967A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2303532B1 (fr) * 2008-06-20 2012-07-18 Shell Internationale Research Maatschappij B.V. Procédé pour la fabrication d'unités de liaison revêtues
EP2370538B1 (fr) 2008-12-19 2019-03-20 3M Innovative Properties Company Procédé de fabrication d'articles adhésifs
EP2507029B1 (fr) 2009-12-04 2014-02-26 Shell Internationale Research Maatschappij B.V. Procédé pour préparer des unités de liant enrobées

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0471879A1 (fr) * 1989-02-28 1992-02-26 Mitsubishi Plastics Industries Limited Filière annulaire pour produits stratifiés
WO2000027628A1 (fr) * 1998-11-06 2000-05-18 4P Folie Forchheim Gmbh Procede de production d'un composite multicouche, et composite produit selon ce procede
DE202004011742U1 (de) * 2004-07-27 2004-10-14 REIFENHäUSER GMBH & CO. MASCHINENFABRIK Koextrusionsadapter
EP1661686A2 (fr) * 2004-11-26 2006-05-31 Huhtamaki Forchheim Zweigniederlassung der Huhtamaki Deutschland GmbH & Co. KG Procédé de fabrication d'une couche mince de silicone, couche mince de silicone et utilisation

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0210261B1 (fr) * 1985-02-05 1991-06-26 Avery International Corporation Doublures et materiaux de parement composites
CA2343518A1 (fr) * 1998-09-04 2000-03-16 Avery Dennison Corporation Constructions adhesives coextrudees
DE102005014474A1 (de) * 2005-03-27 2006-10-05 Huhtamaki Forchheim Zweigniederlassung Der Huhtamaki Deutschland Gmbh & Co. Kg Verfahren zum Herstellen einer gereckten Kunststoff-Folie
EP1719808A3 (fr) * 2005-05-06 2007-05-30 Eastman Chemical Company Laminés autocollants

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0471879A1 (fr) * 1989-02-28 1992-02-26 Mitsubishi Plastics Industries Limited Filière annulaire pour produits stratifiés
WO2000027628A1 (fr) * 1998-11-06 2000-05-18 4P Folie Forchheim Gmbh Procede de production d'un composite multicouche, et composite produit selon ce procede
DE19851104A1 (de) * 1998-11-06 2000-05-18 4 P Folie Forchheim Gmbh Verfahren zum Herstellen eines mehrschichtigen Verbundes und so hergestellter Verbund
DE202004011742U1 (de) * 2004-07-27 2004-10-14 REIFENHäUSER GMBH & CO. MASCHINENFABRIK Koextrusionsadapter
EP1621320A1 (fr) * 2004-07-27 2006-02-01 Reifenhäuser GmbH & Co. Maschinenfabrik Dispositif d'alimentation pour co-extrusion
EP1661686A2 (fr) * 2004-11-26 2006-05-31 Huhtamaki Forchheim Zweigniederlassung der Huhtamaki Deutschland GmbH & Co. KG Procédé de fabrication d'une couche mince de silicone, couche mince de silicone et utilisation
DE102004057382A1 (de) * 2004-11-26 2006-06-01 Huhtamaki Forchheim Zweigniederlassung Der Huhtamaki Deutschland Gmbh & Co. Kg Verfahren zur Herstellung dünner Schichten eines Silikons, dünnes Silikon und Verwendung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2008095967A1 *

Also Published As

Publication number Publication date
WO2008095967A1 (fr) 2008-08-14
DE102007006648A1 (de) 2008-08-07

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