WO1996005051A1 - Oriented hdpe laminates for easy directional opening - Google Patents
Oriented hdpe laminates for easy directional opening Download PDFInfo
- 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
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
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP95928366A EP0777573A4 (en) | 1994-08-10 | 1995-08-09 | Oriented hdpe laminates for easy directional opening |
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 (en) | 1996-02-22 |
Family
ID=10759693
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1995/010113 WO1996005051A1 (en) | 1994-08-10 | 1995-08-09 | Oriented hdpe laminates for easy directional opening |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0777573A4 (en) |
CA (1) | CA2194767A1 (en) |
GB (1) | GB9416183D0 (en) |
WO (1) | WO1996005051A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0929583A1 (en) * | 1996-10-03 | 1999-07-21 | Mobil Oil Corporation | High density polyethylene film with high biaxial orientation |
Citations (4)
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)
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 (en) * | 1988-09-08 | 1990-03-13 | Tonen Sekiyukagaku Kk | Polyethylene oriented film and manufacture thereof |
JP2785403B2 (en) * | 1989-12-19 | 1998-08-13 | 三菱化学株式会社 | Film production method |
DE69125319T2 (en) * | 1990-01-30 | 1997-10-30 | Nippon Petrochemicals Co Ltd | MONOAXIAL ORIENTED MULTILAYER PACKAGING MATERIAL |
JPH05220836A (en) * | 1992-02-17 | 1993-08-31 | Nippon Petrochem Co Ltd | Straight line cutting film and preparation thereof |
US5346763A (en) * | 1993-04-21 | 1994-09-13 | Mobil Oil Corporation | Multilayer film structure |
-
1994
- 1994-08-10 GB GB9416183A patent/GB9416183D0/en active Pending
-
1995
- 1995-08-09 WO PCT/US1995/010113 patent/WO1996005051A1/en not_active Application Discontinuation
- 1995-08-09 EP EP95928366A patent/EP0777573A4/en not_active Ceased
- 1995-08-09 CA CA002194767A patent/CA2194767A1/en not_active Abandoned
Patent Citations (4)
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)
Title |
---|
See also references of EP0777573A4 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0929583A1 (en) * | 1996-10-03 | 1999-07-21 | Mobil Oil Corporation | High density polyethylene film with high biaxial orientation |
EP0929583A4 (en) * | 1996-10-03 | 1999-12-29 | Mobil Oil Corp | High density polyethylene film with high biaxial orientation |
Also Published As
Publication number | Publication date |
---|---|
EP0777573A4 (en) | 1998-09-30 |
EP0777573A1 (en) | 1997-06-11 |
GB9416183D0 (en) | 1994-09-28 |
CA2194767A1 (en) | 1996-02-22 |
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