+

WO1996005051A1 - Stratifies orientes d'hdpe donnant une ouverture directionnelle facile - Google Patents

Stratifies orientes d'hdpe donnant une ouverture directionnelle facile Download PDF

Info

Publication number
WO1996005051A1
WO1996005051A1 PCT/US1995/010113 US9510113W WO9605051A1 WO 1996005051 A1 WO1996005051 A1 WO 1996005051A1 US 9510113 W US9510113 W US 9510113W WO 9605051 A1 WO9605051 A1 WO 9605051A1
Authority
WO
WIPO (PCT)
Prior art keywords
oriented
hdpe
density polyethylene
high density
film
Prior art date
Application number
PCT/US1995/010113
Other languages
English (en)
Inventor
François-Philippe BOSCH
Original Assignee
Mobil Plastics Europe, Inc.
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 Mobil Plastics Europe, Inc. filed Critical Mobil Plastics Europe, Inc.
Priority to EP95928366A priority Critical patent/EP0777573A4/fr
Publication of WO1996005051A1 publication Critical patent/WO1996005051A1/fr

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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • 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
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/023—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets using multilayered plates or sheets
    • 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
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
    • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
    • 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
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/065—HDPE, i.e. high density polyethylene
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B32B2250/242—All polymers belonging to those covered by group B32B27/32
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B32B2307/518—Oriented bi-axially
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7244—Oxygen barrier
    • 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
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • B32B2323/043—HDPE, i.e. high density polyethylene
    • 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
    • B32B2323/00—Polyalkenes
    • B32B2323/10—Polypropylene
    • 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
    • B32B2439/00—Containers; Receptacles
    • B32B2439/40—Closed containers
    • B32B2439/46—Bags

Definitions

  • This invention relates to oriented high density polyethylene (HDPE) laminates; more particularly, the present invention relates to such laminates used to fabricate bags which possess both easy directional opening and reclosability.
  • HDPE high density polyethylene
  • VFFS vertical form, fill and seal
  • HFFS horizontal form, fill and seal
  • TD transverse direction
  • a laminate which comprises:
  • a film of high density polyethylene which is biaxially oriented such that the ratio of the deformation ratio in the transverse direction (DRTD) to the deformation ratio in the machine direction (DRMD) is greater than 1, laminated to an oriented web, to provide propagation control along the transverse direction of the high density polyethylene.
  • the biaxially oriented high density polyethylene films used in the laminates of this invention are prepared using high density polyethylene (HDPE) having a density of at least 0.94, preferably at least 0.96 g/cm 3 .
  • the film can be composed exclusively of a single HDPE resin, a mixture of HDPE resins, or of HDPE containing up to 10 weight percent microcrystalline wax.
  • the mixture of HDPE resins gives better processing characteristics in the extruder by reducing extruder torque.
  • Films made with either a blend of HDPE resins or with microcrystalline wax reduce splittiness of the film which manifests itself as the tendency of the film to break in the TD during operation on VFFS machinery.
  • the blends of HDPE polymers can comprise two or more polymers all of which preferably have densities of at least 0.96.
  • Blends of HDPE polymers advantageously comprise a major proportion of HDPE having a melt index of 0.6 to 1.2 and one or more polymers having a different melt index. Terblends have been found particularly desirable.
  • Suitable terblends generally comprise 50 to 98 weight percent, preferably 84 to 96 weight percent, of HDPE having a density of 0.96 g/cm 3 or higher and a melt index of greater than 0.5 to 2.0; 1 to 25 weight percent, preferably 3 to 8 weight percent, of HDPE having a density of 0.96 g/cm 3 or greater and a melt index of 0.1 to 0.5; and 1 to 25 weight percent, preferably 3 to 8 weight percent, of HDPE having a density of 0.96 g/cm 3 or higher and a melt index of greater than 2 to 8.
  • the second and third HDPE polymers (which are minor components) are present in about equal amounts. It is highly desirable that the biaxially oriented
  • HDPE films used in the laminates of this invention be provided with a heat seal layer.
  • the heat seal layer can be applied in the known manner to the HDPE, for example by coating or coextrusion before orientation or by coating the HDPE after one or both of the biaxial orientation operations.
  • the heat seal layer can be any of the conventional material used for this purpose in conjunction with polyolefin films particularly polyethylene films.
  • polyethylene films particularly polyethylene films.
  • ethylene-vinyl acetate copolymers or ethylene- methacrylic acid salt ionomers (available from DuPont as "Surlyn") can be used.
  • Films in which the heat seal layer is an ethylene-methacrylic acid salt ionomer have been found to be particularly useful in preparing films which are suitable for VFFS applications.
  • the heat seal layer can comprise the heat seal resin as such or can include small amounts of other materials.
  • the relatively costly Surlyn ionomer can be mixed with small amounts of less costly materials such as low density polyethylene.
  • the HDPE films of this invention can include other polymer layers in addition to or instead of the heat seal layer, for example polymers having desirable barrier properties for gases such as oxygen.
  • polymers having desirable barrier properties for gases such as oxygen include polymers of vinylidene chloride.
  • the degree of orientation of the HDPE films is an important aspect of this invention inasmuch as the proper degree of orientation provides desirable physical properties, good water vapor transmission (WVTR) characteristics and dead-fold.
  • WVTR water vapor transmission
  • the film is heated to its orientation temperature and first subjected to MD orientation between two sets of nip rolls, the second rotating at a greater speed than the first in an amount equal to the desired draw ratio. Then the film is TD oriented by heating and subjected it to transverse stretching in a tenter frame.
  • MD orientation is conducted at 60° to 120°C and TD orientation at 100° to 145°C.
  • the preferred deformation ratios are from 1.1 to 2, suitably from 1.18 to 1.25 in the MD and from 6 to 12 in the TD.
  • the oriented web (ii) may comprise an oriented plastics film or paper, preferably a biaxially oriented plastics film.
  • the film may suitably comprise an olefin polymer, especially polypropylene.
  • the web may be formed and laminated to the biaxially oriented film (ii) in any known manner.
  • the laminate may then be formed with a bag with conventional VFFS or HFFS machinery.
  • Laminates were made, both in accordance with the present invention and by way of comparison, on a pilot coater.
  • Bags were then produced on a VFFS machine to evaluate the directional tear and reclosability.
  • the results are shown in the following Table. The following ranking was used:
  • PET represents polyethylene « terephthalate
  • HDPE represents biaxially oriented HDPE
  • PP represents biaxially oriented polypropylene
  • LLDPE represents linear low density polyethylene
  • PA represents oriented nylon
  • Paper represents paper having a weight of 40 g per sq. metre

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)
  • Bag Frames (AREA)

Abstract

L'invention concerne un emballage à couches plastiques orientées qui procure une bonne maîtrise directionnelle d'ouverture et peut se refermer. Un aspect de l'invention concerne un stratifié comprenant: (i) une couche d'un polyéthylène à haute densité (HPDE) laiminée sur (ii) une bande orientée. Cette couche présente une orientation biaxiale telle que le rapport entre le rapport de déformation transversale et celui de la déformation intervenant dans le sens de la machine dépasse 1.
PCT/US1995/010113 1994-08-10 1995-08-09 Stratifies orientes d'hdpe donnant une ouverture directionnelle facile WO1996005051A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP95928366A EP0777573A4 (fr) 1994-08-10 1995-08-09 Stratifies orientes d'hdpe donnant une ouverture directionnelle facile

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9416183A GB9416183D0 (en) 1994-08-10 1994-08-10 Oriented HDPE laminates for easy direct onal opening and reclosable bags
GB9416183.3 1994-08-10

Publications (1)

Publication Number Publication Date
WO1996005051A1 true WO1996005051A1 (fr) 1996-02-22

Family

ID=10759693

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1995/010113 WO1996005051A1 (fr) 1994-08-10 1995-08-09 Stratifies orientes d'hdpe donnant une ouverture directionnelle facile

Country Status (4)

Country Link
EP (1) EP0777573A4 (fr)
CA (1) CA2194767A1 (fr)
GB (1) GB9416183D0 (fr)
WO (1) WO1996005051A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0929583A4 (fr) * 1996-10-03 1999-12-29 Mobil Oil Corp Film de polyethylene de haute masse volumique a forte orientation moleculaire biaxiale

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4565738A (en) * 1983-06-01 1986-01-21 Imperial Chemical Industries, Plc Multiple-layer polyolefin films
US5006378A (en) * 1987-11-13 1991-04-09 Toa Neryo Kogyo Kabushiki Kaisha Polyethylene composite film
US5250334A (en) * 1991-06-05 1993-10-05 Du Pont Canada Inc. Coffee web
US5348794A (en) * 1990-01-30 1994-09-20 Nippon Petrochemicals Company, Limited Monoaxially oriented multilayered packaging material

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3894904A (en) * 1973-06-11 1975-07-15 Crown Zellerbach Corp Method of manufacturing synthetic paper laminates
GB1535982A (en) * 1976-08-04 1978-12-13 Leer Koninklijke Emballage Dry lamination
GB1577128A (en) * 1976-10-27 1980-10-22 Leer Koninklijke Emballage Production of polymeric film laminates
US4870122A (en) * 1987-09-28 1989-09-26 Mobil Oil Corporation HdPE films with imbalanced biaxial orientation
JPH0272933A (ja) * 1988-09-08 1990-03-13 Tonen Sekiyukagaku Kk ポリエチレン延伸フイルム及びその製造方法
JP2785403B2 (ja) * 1989-12-19 1998-08-13 三菱化学株式会社 フィルムの製造方法
WO1991011317A1 (fr) * 1990-01-30 1991-08-08 Nippon Petrochemicals Co., Ltd. Materiau d'emballage multicouche a orientation monoaxiale
JPH05220836A (ja) * 1992-02-17 1993-08-31 Nippon Petrochem Co Ltd 直線カット性フィルム及びその製造法
US5346763A (en) * 1993-04-21 1994-09-13 Mobil Oil Corporation Multilayer film structure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4565738A (en) * 1983-06-01 1986-01-21 Imperial Chemical Industries, Plc Multiple-layer polyolefin films
US5006378A (en) * 1987-11-13 1991-04-09 Toa Neryo Kogyo Kabushiki Kaisha Polyethylene composite film
US5348794A (en) * 1990-01-30 1994-09-20 Nippon Petrochemicals Company, Limited Monoaxially oriented multilayered packaging material
US5250334A (en) * 1991-06-05 1993-10-05 Du Pont Canada Inc. Coffee web

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0777573A4 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0929583A4 (fr) * 1996-10-03 1999-12-29 Mobil Oil Corp Film de polyethylene de haute masse volumique a forte orientation moleculaire biaxiale

Also Published As

Publication number Publication date
CA2194767A1 (fr) 1996-02-22
EP0777573A4 (fr) 1998-09-30
EP0777573A1 (fr) 1997-06-11
GB9416183D0 (en) 1994-09-28

Similar Documents

Publication Publication Date Title
US4870122A (en) HdPE films with imbalanced biaxial orientation
US5302442A (en) Heat sealable base films
US5223346A (en) Hdpe/polypropylene film laminates
US5108844A (en) Blended films, structures therefrom, and methods of making and using them
CA1317427C (fr) Pellicules multicouches a orientation bioaxiale
US4469752A (en) Cold drawn high-orientation multilayered film and process for manufacture of said film
US4916025A (en) HDPE films with imbalanced biaxial orientation
CA1243257A (fr) Pellicules ou feuilles multicouche
CA1286642C (fr) Sac thermoplastique
US4275120A (en) Heat sealable packaging film comprising propylene polymer substrate and olefin surface layer blend of polybutene-1 and an ethylene or a propylene copolymer
US20200391489A1 (en) Recyclable Packaging Laminate with Improved Heat Resistance for Sealing
JPS6412226B2 (fr)
CA2239549A1 (fr) Films de polyethylene a orientation biaxiale
TWI870462B (zh) 包裝體
CN107696623A (zh) 一种适用于生产线自动快速包装的热收缩膜
EP3758937A1 (fr) Films de polyester à ouverture facile et scellables
US4339493A (en) Heat sealable packaging film comprising propylene polymer substrate and olefin surface layer blend of polybutene-1 and an ethylene or a propylene copolymer
US4339494A (en) Heat sealable packaging film comprising propylene polymer substrate and olefin surface layer blend of polybutene-1 and an ethylene or a propylene copolymer
US4460631A (en) Sealable, biaxially stretched polypropylene film having high scratch resistance, and process for its manufacture
US5985388A (en) Multi-layer transparent sealant film for laminating comprising high density polyethylene layer and packaging flim and pouch using the same
JPS5837907B2 (ja) 易ヒ−トシ−ル性２軸延伸複合フイルム
JP3188175B2 (ja) 包装フィルム及びそれを用いたシュリンク包装体
EP0777573A1 (fr) Stratifies orientes d'hdpe donnant une ouverture directionnelle facile
JPH04232048A (ja) エチレンプロピレンターポリマーフィルム
JP4043599B2 (ja) ガスバリア性多層ヒートシールフィルムとその製造方法

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CA US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
ENP Entry into the national phase

Ref document number: 1996 765552

Country of ref document: US

Date of ref document: 19961220

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 2194767

Country of ref document: CA

WWE Wipo information: entry into national phase

Ref document number: 1995928366

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 1995928366

Country of ref document: EP

WWR Wipo information: refused in national office

Ref document number: 1995928366

Country of ref document: EP

WWW Wipo information: withdrawn in national office

Ref document number: 1995928366

Country of ref document: EP

点击 这是indexloc提供的php浏览器服务，不要输入任何密码和下载