EP0777573A1 - Orientierte hdpe-schichtstoffe einfach richtungsorientiert zu öffnen - Google Patents

Orientierte hdpe-schichtstoffe einfach richtungsorientiert zu öffnen

Info

Publication number
EP0777573A1
EP0777573A1 EP95928366A EP95928366A EP0777573A1 EP 0777573 A1 EP0777573 A1 EP 0777573A1 EP 95928366 A EP95928366 A EP 95928366A EP 95928366 A EP95928366 A EP 95928366A EP 0777573 A1 EP0777573 A1 EP 0777573A1
Authority
EP
European Patent Office
Prior art keywords
oriented
hdpe
density polyethylene
high density
film
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
EP95928366A
Other languages
English (en)
French (fr)
Other versions
EP0777573A4 (de
Inventor
François-Philippe BOSCH
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.)
Mobil Plastics Europe Inc USA
Original Assignee
Mobil Plastics Europe Inc USA
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 USA filed Critical Mobil Plastics Europe Inc USA
Publication of EP0777573A1 publication Critical patent/EP0777573A1/de
Publication of EP0777573A4 publication Critical patent/EP0777573A4/de
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
    • 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)
EP95928366A 1994-08-10 1995-08-09 Orientierte hdpe-schichtstoffe einfach richtungsorientiert zu öffnen Ceased EP0777573A4 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9416183 1994-08-10
GB9416183A GB9416183D0 (en) 1994-08-10 1994-08-10 Oriented HDPE laminates for easy direct onal opening and reclosable bags
PCT/US1995/010113 WO1996005051A1 (en) 1994-08-10 1995-08-09 Oriented hdpe laminates for easy directional opening

Publications (2)

Publication Number Publication Date
EP0777573A1 true EP0777573A1 (de) 1997-06-11
EP0777573A4 EP0777573A4 (de) 1998-09-30

Family

ID=10759693

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95928366A Ceased EP0777573A4 (de) 1994-08-10 1995-08-09 Orientierte hdpe-schichtstoffe einfach richtungsorientiert zu öffnen

Country Status (4)

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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6689857B1 (en) * 1996-10-03 2004-02-10 Exxonmobil Oil Corporation High density polyethylene film with high biaxial orientation

Citations (7)

* 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
GB1577128A (en) * 1976-10-27 1980-10-22 Leer Koninklijke Emballage Production of polymeric film laminates
US4355076A (en) * 1976-08-04 1982-10-19 Koninklijke Emballage Industrie Van Leer, B.V. Dry lamination
US4870122A (en) * 1987-09-28 1989-09-26 Mobil Oil Corporation HdPE films with imbalanced biaxial orientation
US5045620A (en) * 1988-09-08 1991-09-03 Tonen Sekiyukagaku K.K. Oriented polyethylene film and production thereof
EP0465681A1 (de) * 1990-01-30 1992-01-15 Nippon Petrochemicals Co., Ltd. Monoorientiertes mehrschichtiges verpackungsmaterial
US5346763A (en) * 1993-04-21 1994-09-13 Mobil Oil Corporation Multilayer film structure

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8315001D0 (en) * 1983-06-01 1983-07-06 Ici Plc Multiple-layer polyolefin films
US5006378A (en) * 1987-11-13 1991-04-09 Toa Neryo Kogyo Kabushiki Kaisha Polyethylene composite film
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
US5348794A (en) * 1990-01-30 1994-09-20 Nippon Petrochemicals Company, Limited Monoaxially oriented multilayered packaging material
GB9112053D0 (en) * 1991-06-05 1991-07-24 Du Pont Canada Coffee web
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

Patent Citations (7)

* 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
US4355076A (en) * 1976-08-04 1982-10-19 Koninklijke Emballage Industrie Van Leer, B.V. 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
US5045620A (en) * 1988-09-08 1991-09-03 Tonen Sekiyukagaku K.K. Oriented polyethylene film and production thereof
EP0465681A1 (de) * 1990-01-30 1992-01-15 Nippon Petrochemicals Co., Ltd. Monoorientiertes mehrschichtiges verpackungsmaterial
US5346763A (en) * 1993-04-21 1994-09-13 Mobil Oil Corporation Multilayer film structure

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch, Week 9139 Derwent Publications Ltd., London, GB; Class A17, AN 91-285326 XP002073461 & JP 03 189 124 A (MITSUBISHI KASEI CORP) *
DATABASE WPI Section Ch, Week 9339 Derwent Publications Ltd., London, GB; Class A32, AN 93-308721 XP002073462 & JP 05 220 836 A (NIPPON PETROCHEMICALS CO LTD) *
See also references of WO9605051A1 *

Also Published As

Publication number Publication date
WO1996005051A1 (en) 1996-02-22
GB9416183D0 (en) 1994-09-28
CA2194767A1 (en) 1996-02-22
EP0777573A4 (de) 1998-09-30

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