EP0906181A1 - Film obtenu par coextrusion-soufflage et produits realises a l'aide de ce film - Google Patents

Film obtenu par coextrusion-soufflage et produits realises a l'aide de ce film

Info

Publication number
EP0906181A1
EP0906181A1 EP97926501A EP97926501A EP0906181A1 EP 0906181 A1 EP0906181 A1 EP 0906181A1 EP 97926501 A EP97926501 A EP 97926501A EP 97926501 A EP97926501 A EP 97926501A EP 0906181 A1 EP0906181 A1 EP 0906181A1
Authority
EP
European Patent Office
Prior art keywords
blown film
layer
film
low density
density polyethylene
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP97926501A
Other languages
German (de)
English (en)
Other versions
EP0906181A4 (fr
Inventor
William E. Heikkila
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.)
Union Camp Corp
Original Assignee
Union Camp Corp
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 Union Camp Corp filed Critical Union Camp Corp
Publication of EP0906181A4 publication Critical patent/EP0906181A4/en
Publication of EP0906181A1 publication Critical patent/EP0906181A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C48/16—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
    • B29C48/335—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/08—Copolymers of ethylene
    • B29K2023/083—EVA, i.e. ethylene vinyl acetate copolymer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene

Definitions

  • the present invention is directed to coextruded blown films of polyolefin having multiple layers which are particularly suited for forming packages for the storage of difficult to store materials
  • Plastics such as low, linear low, and high density polyethylene (LDPE LLDPE, and HDPE) are extruded through a circular die to form a film Air is introduced through the center of the die to maintain the film in the form of a bubble which increases
  • the number of extruders is dependent upon the number of different materials comprising the coextruded film For each different material a different extruder is used. Thus a five-layer coextrusion may require up to five extruders although less may be used if two or more of the layers are made of the same material
  • a melt enters a ring-shaped die either through the bottom or side thereof.
  • the melt is forced through spiral grooves around the surface of a mandrel inside the die and extruded through the die opening as a thick-walled tube.
  • the tube is expanded into a bubble of desired diameter and correspondingly decreased thickness as previously described.
  • Coextrusion dies are used to form coextruded blown films They have multiple mandrels that feed the different melt streams to the circular die lip Feedblocks are employed to stack melt layers from two or more extruders The multilayered melt stream is then fed to the film die
  • Coextruded blown films are commercially available for example, a coextruded blown film of ethylene vinyl acetate (EVA)/LLDPE/t ⁇ e resin/nylon/tie resin/LLDPE/EVA is produced by James River Corporation under the tradename Zeelon 590 A three layer coextruded blown film comprising metallocene (m) LLDPE(EVA)/t ⁇ e resin/nylon/tie resin/mLLDPE(EVA) is produced by United Films under the tradename Unilon 5238 A multilayer coextruded blown film comprised of HDPE/tie-resin/nylon/tie resin/LLDPE/mLLDPE is produced by United Film under the tradename Unilon 5890
  • the present invention is directed to a coextruded blown film having multiple layers in which at least one of the layers is a metallocene linear low density polyethylene and at least one other layer is an impact grade polypropylene
  • Pouches, bags and other containers made from this combination of materials provide excellent toughness and impact strength and furthermore provide an excellent barrier to grease and oil and light hydrocarbons such as turpentine and the like.
  • coextruded blown film of the present invention can be used as a packaging substrate alone, as a liner in multi-wall bags, or a strength/sealant ply in laminated structures such as with polyethylene terephthalate or biaxially oriented polypropylene BRIEF DESCRIPTION OF THE DRAWING
  • Figure 1 is a schematic view of a typical blown film extrusion apparatus
  • Figure 2 is a schematic view of a coextrusion die with multiple mandrels for use
  • FIG. 1 there is shown a known blown film extrusion device 2 comprised of a bubble forming section 4, a control section 6 and a thin film forming section 8.
  • the bubble forming section 4 includes an inlet 10 for receiving a suitable molten, plastic resin.
  • a pathway 14 is provided for the flow of the melted resin from the inlet to a narrow annular outlet 16 which forms the molten resin into a continuous bubble 18 when air is blown into the resin within the circumference of the annular outlet
  • the control section 6 controls the size of the bubble
  • the control section 6 is provided with sensors 20 which detect the diameter of the bubble 18 and transmit a
  • the film forming section 8 includes a frame 24 which draws the sides of the bubble 18 inwardly so that the sides collapse on one another to form a two layer film 26
  • the film is passed through nip rolls 28 which draws the two layers of film upward and sends the compressed film to a storage facility (not shown)
  • the extrusion device 2 is a typically provided with an external cooling section 29 in which air which is cooler than the air within the bubble is obtained from a source (not shown) and is transported via a conduit 30 around the circumference of the bubble 18 as it leaves the outlet 16
  • an internal cooling assembly 32 which includes a conduit 34 for receiving ambient or cooled air from a source (not shown) and transporting the same to a outlet 36 having an opening 37 within the bubble 18 Air
  • a coextrusion die is used to form a multilayer film shown as layers A, B and C in Figure 2
  • a coextrusion die shown generally by the numeral 40
  • Three mandreis 42, 44 and 46 are used to feed different melt streams to the die 40 It will be understood that while three
  • mandrels are shown more than three mandrels can be employed The die mandrels
  • a die opening 48 is provided which is a ring shaped gap between a die ring 50 and the mandrels (42, 44 and 46) The die opening 48 controls the
  • the materials comprising the coextruded blown film in accordance with the present invention include at least one layer of metallocene linear low density
  • Metallocene linear low density polyethylene is a material produced using the catalyst metallocene It has a narrow molecular weight distribution and
  • Impact grade polypropylene is polypropylene that typically has from about 8 to 15% by weight of ethylene.
  • An example of such material is PP7031 manufactured by Exxon Corporation and KSO89P manufactured by Montell Corporation
  • the modified polypropylene has a density from about 0.890 to 0 905 g/cm 3 , a melt flow rate of from about 0.5 to 2.0 g/10 min. and a tensile strength at yield of from about 3400 to 4100 psi.
  • mLLDPE in combination with impact grade polypropylene provides a coextruded blown film which has excellent characteristics for packaging of abrasive, corrosive and/or high grease, oil or fat content materials such as pet foods, herbicides, pesticides, oil modified seeds, animal bedding, lawn & garden products, rice, and commeal.
  • the impact grade polypropylene can vary over a wide range.
  • the mLLDPE is present in an amount of from about 25 to 75% by weight and the impact grade polypropylene in an amount of from about 25 to 67% by weight, based on the total weight of the coextruded blown film.
  • a preferred construction of the present invention comprises a layer of the impact grade polypropylene sandwiched between at least one and preferably two layers of the
  • the layers of the mLLDPE comprise 20 and 40% by weight, respectively of the total weight of the coextruded blown film while the impact grade polypropylene is present in an amount of from about 30 to 50% by weight
  • the thickness of the film can vary of a wide range, the film must be thick enough so that a leak proof seal can be formed It is preferred for most applications that the coextruded blown film have a thickness of from about 0 0015 to 0 006 inches, preferably from about 0 0030 to 0 0045 inches
  • coextruded blown films of the present invention can be formed into pouches bags, containers and the like using customary packaging machinery such as heat sealing devices using mandrels and the like
  • Film has been produced on 3-layer coextrusion system equipped with two extruders and an ABA coextrusion blown film die of the type shown in Figure 2
  • a film structure was produced which had a total thickness of 0 0046 inches and included the following 20% by weight Exxon 350 D60 mLLDPE, 50% by weight Exxon PP7031 polypropylene and 30% by weight 350 D60 mLLDPE
  • a 3.5" Sano extruder with a 30:1 UD (Length-to-Diameter ratio) barrier type screw was used to feed a mLLDPE to the outer "A" layers
  • An extruder temperature profile of 350-400-390-380-380F and a melt temperature at the die of 390F was used in processing the resin.
  • the temperature profile and melt temperature were 410-360-400-405-41 OF and 417F, respectively
  • Example 2 D 60 m LLDPE, 50% by weight of Montel KSO89P polypropylene and 25% by weight of Exxon 350 D 60 mLLDPE.
  • the film was processed in a manner similar to Example 1.
  • Example 2 The procedure of or similar to Example 1 was repeated except that the materials and amounts thereof used to form the film was as follows. 25% by weight of a blend of linear low density polyethylene (LLDPE) and low density polyethylene (LDPE) as the outside layer, 50% by weight of polypropylene as the middle layer and 25% by weight of mLLDPE as the inside layer.
  • LLDPE linear low density polyethylene
  • LDPE low density polyethylene
  • mLLDPE mLLDPE
  • Example 2 LLDPE and LDPE as the outside layer, 35% by weight of polypropylene as the middle layer, and 35% by weight of mLLDPE as the inside layer.
  • the film was processed in a manner similar to Example 1.

Landscapes

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

Abstract

L'invention a pour objet un film (2) obtenu par coextrusion-soufflage. Ce film est réalisé à partir d'au moins une couche d'un polypropylène basse densité linéaire d'alliage organométallique et d'au moins une couche d'un polypropylène de type résistant aux chocs. L'invention a aussi pour objet des dispositifs d'emballage réalisés à partir d'un film obtenu par coextrusion-soufflage.
EP97926501A 1996-05-20 1997-05-14 Film obtenu par coextrusion-soufflage et produits realises a l'aide de ce film Withdrawn EP0906181A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US1768196P 1996-05-20 1996-05-20
US17681P 1996-05-20
PCT/US1997/008177 WO1997044178A1 (fr) 1996-05-20 1997-05-14 Film obtenu par coextrusion-soufflage et produits realises a l'aide de ce film

Publications (2)

Publication Number Publication Date
EP0906181A4 EP0906181A4 (fr) 1999-04-07
EP0906181A1 true EP0906181A1 (fr) 1999-04-07

Family

ID=21783985

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97926501A Withdrawn EP0906181A1 (fr) 1996-05-20 1997-05-14 Film obtenu par coextrusion-soufflage et produits realises a l'aide de ce film

Country Status (3)

Country Link
EP (1) EP0906181A1 (fr)
CA (1) CA2253218A1 (fr)
WO (1) WO1997044178A1 (fr)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998006676A1 (fr) 1996-08-13 1998-02-19 Nippon Sheet Glass Co., Ltd. Procede d'usinage au laser pour substrat de verre, dispositif optique du type a diffraction fabrique par ce procede d'usinage, et procede de fabrication de ce dispositif optique
PL335377A1 (en) * 1997-02-25 2000-04-25 Exxon Chemical Patents Inc Welds between polyethylene and its substrate
CA2278364A1 (fr) * 1997-02-25 1998-08-27 Achiel Josephus Maria Van Loon Film oriente coextrude
JP2001521558A (ja) 1997-02-25 2001-11-06 エクソン・ケミカル・パテンツ・インク ヒートシール可能なフィルム
US6094889A (en) * 1997-02-25 2000-08-01 Exxon Chemical Patents, Inc. Method of form and seal packaging
US6423420B1 (en) 1997-08-11 2002-07-23 Exxonmobil Chemical Patents Inc. Oriented coextruded films
US6237308B1 (en) 1999-05-14 2001-05-29 Glopak Inc. High-speed pouch forming, sealing and filling machine, method of operation, and multi-layer film therefore
US20020009579A1 (en) 1999-05-17 2002-01-24 Yves Quintin Multi-layer film structure for use with a high-speed pouch forming, filling and sealing machine
FR2837471B1 (fr) * 2002-03-25 2004-07-09 Flexico France Sarl Film notamment pour sachet d'emballage
EP1495861A1 (fr) * 2003-07-10 2005-01-12 Total Petrochemicals Research Feluy Containers ayant une haute transparence et une résistance au choc élevée
US7217767B2 (en) 2004-07-06 2007-05-15 Fina Technology, Inc. Blends of polypropylene impact copolymer with other polymers
US20060147663A1 (en) * 2004-12-30 2006-07-06 Fina Technology, Inc. Co-extruded film structures of polypropylene impact copolymer with other polymers
US20070082155A1 (en) * 2005-10-12 2007-04-12 Rehkugler Richard A Polymer films and methods of producing and using such films
US7915342B2 (en) 2005-11-28 2011-03-29 Fina Techology, Inc. Breathable films
EP2006070A1 (fr) 2007-06-22 2008-12-24 Total Petrochemicals Research Feluy Procédé de production d'un film soufflé multicouches en polyéthylène-polypropylène
EP2075125A1 (fr) * 2007-12-19 2009-07-01 Total Petrochemicals Research Feluy Films de polyéthylène traités par décharge corona
US9084444B2 (en) 2010-05-25 2015-07-21 Inteplast Group, Ltd. Disposable gloves and glove material compositions
EP2554374B1 (fr) 2011-08-01 2016-03-16 The Procter & Gamble Company Film multicouche, paquets comportant le film multicouche et procédés de fabrication
US9131737B2 (en) 2011-09-15 2015-09-15 Inteplast Group, Ltd. Disposable gloves and glove material compositions including a coloring agent
US9084445B2 (en) 2011-09-15 2015-07-21 Inteplast Group, Ltd. Disposable gloves and glove material compositions

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995026269A1 (fr) * 1994-03-28 1995-10-05 W.R. Grace & Co.-Conn. Film multicouche permeable a l'oxygene, procede de production de ce film, procede d'emballage et produit emballe a l'aide de ce film

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4222740A1 (de) * 1992-07-10 1994-01-13 Hoechst Ag Niedrig siegelnde, biaxial orientierte Polyolefin-Mehrschichtfolie mit hohem Schrumpf

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995026269A1 (fr) * 1994-03-28 1995-10-05 W.R. Grace & Co.-Conn. Film multicouche permeable a l'oxygene, procede de production de ce film, procede d'emballage et produit emballe a l'aide de ce film

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO9744178A1 *

Also Published As

Publication number Publication date
WO1997044178A1 (fr) 1997-11-27
CA2253218A1 (fr) 1997-11-27
EP0906181A4 (fr) 1999-04-07

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