CA2194767A1 - Oriented hdpe laminates for easy directional opening - Google Patents
Oriented hdpe laminates for easy directional openingInfo
- Publication number
- CA2194767A1 CA2194767A1 CA002194767A CA2194767A CA2194767A1 CA 2194767 A1 CA2194767 A1 CA 2194767A1 CA 002194767 A CA002194767 A CA 002194767A CA 2194767 A CA2194767 A CA 2194767A CA 2194767 A1 CA2194767 A1 CA 2194767A1
- Authority
- CA
- Canada
- Prior art keywords
- oriented
- density polyethylene
- hdpe
- 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.)
- Abandoned
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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
- Wrappers (AREA)
- Bag Frames (AREA)
Abstract
This invention provides oriented plastics film packaging which has easy directional control of opening and is reclosable. One aspect of the invention is a laminate which comprises: (i) a film of high density polyethylene laminated to (ii) an oriented web wherein (i) is biaxially oriented such that the ratio of the deformation ratio in the transverse direction to the deformation ratio in the machine direction is greater than 1.
Description
w 096/ososl 2 ! ~ 4 7 6 7 pcTrus9slloll3 "ORIENTED HDPE LAMINATES FOR EASY DIRECTIONAL OPENING"
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.
Oriented plastics films currently enjoy a substantial share of the packaging market, especially of perishable goods such as comestibles. However, bags made with such films on vertical form, fill and seal (VFFS) and horizontal form, fill and seal (HFFS) packaging machines have hermetic seals; and these seals often present the consumer with difficulty of access to the product.
Attempts to overcome this difficulty include precut systems at the top transverse direction ( TD ) seal which allow the consumer to initiate a tear in the package; but often with biaxially oriented film, the propagation of the tear is uncontrolled and results in destruction of the bag; jetti~on of product; and consumer dissatisfaction.
Other attempts include tear tape systems which can give a measure of directional control to the propagation of the tear but still result in bag destruction; furthermore, it is often the consumer's experience that the tape itself ruptures.
This invention seeks to provide oriented plastics film packaging which not only provides the consumer with easy directional control of opening but also is reclosable.
Accordingly, therefore, to one aspect of the present invention there is provided a laminate which comprises:
(i) a film of high density polyethylene laminated to (ii) an oriented web wherein (i) is bi A~i A lly oriented such that the ratio of the deformation ratio in the transverse direction (DRTD) 2 1 9 4 7 6 7 PCT~S95/10113 to the deformation ratio in the machine direction (DRMD) is greater than l.
In accordance with a further aspect of this invention, there is also provided the use of 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 l, 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/cm3. The film can be composed exclusively of a single HDPE resin, a mixture of HDPE resins, or of HDPE cont~ining up to lO
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 l.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/cm3 or higher and a melt index of greater than 0.5 to 2.0; l to 25 weight percent, preferably 3 to 8 weight percent, of HDPE having a density of 0.96 g/cm3 or greater and a melt index of O.l to 0.5;
and l to 25 weight percent, preferably 3 to 8 weight WO96/05051 ~ 9 4 1 61 PCT~S95/10113 percent, of HDPE having a density of 0.96 g/cm3 or higher and a melt index of greater than 2 to 8. Preferably, the ~econd 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. For example 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. For example, 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. Examples 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. For example, it has been determined that the films of this invention having a W096/OS051 2 t ~ 4 7 6 7 PCT~S95/10113 thickness of 1.0 to 1.2 mils will have acceptable WVTR of less than 0.28 g-mil/100 in2/24 hr/1 atm (less than 4.34 x 10-4 g-mil/cm2/24 hr/l atm).
In the usual manner 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. Typically, 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.
It is found that when utilizing a laminate in accordance with this invention in the fabrication of bags then, whatever the present system used, the propagation of the tear is always in the TD. This provides not only control of opening but also enables the consumer to utilize the lower tear edge as a pouring lip.
Furthermore, the dead-fold of the oriented HDPE enables, simply by twisting or folding, the bag to be reclosed.
None of these advantages is present unless the HDPE is laminated in accordance with this invention.
The following Examples illustrate the invention.
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:
E : excellent G : good M : medium F : fair B : bad Wos6/ososl 2 1 ~ 4 7 6 7 PCT~S95/10113 TABLE
Directional Reclosability Laminates Tear TwistFolding 12 Pet/30 LLDPE F F B
20 PP/30 HDPE~ E G M
40 g Paper/30 HDPE E E G
40 g Paper/30 LLDPE B G M
where:
PET represents polyethylene terephthalate HDPE represents biaxially oriented HDPE
PP represents biaxially oriented polypropylene LLDPE represents linear low density polyethylene PA represents oriented nylon 40g Paper represents paper having a weight of 40 g per sq. metre DRTD = 8.0 and DRMD = 1.18
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.
Oriented plastics films currently enjoy a substantial share of the packaging market, especially of perishable goods such as comestibles. However, bags made with such films on vertical form, fill and seal (VFFS) and horizontal form, fill and seal (HFFS) packaging machines have hermetic seals; and these seals often present the consumer with difficulty of access to the product.
Attempts to overcome this difficulty include precut systems at the top transverse direction ( TD ) seal which allow the consumer to initiate a tear in the package; but often with biaxially oriented film, the propagation of the tear is uncontrolled and results in destruction of the bag; jetti~on of product; and consumer dissatisfaction.
Other attempts include tear tape systems which can give a measure of directional control to the propagation of the tear but still result in bag destruction; furthermore, it is often the consumer's experience that the tape itself ruptures.
This invention seeks to provide oriented plastics film packaging which not only provides the consumer with easy directional control of opening but also is reclosable.
Accordingly, therefore, to one aspect of the present invention there is provided a laminate which comprises:
(i) a film of high density polyethylene laminated to (ii) an oriented web wherein (i) is bi A~i A lly oriented such that the ratio of the deformation ratio in the transverse direction (DRTD) 2 1 9 4 7 6 7 PCT~S95/10113 to the deformation ratio in the machine direction (DRMD) is greater than l.
In accordance with a further aspect of this invention, there is also provided the use of 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 l, 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/cm3. The film can be composed exclusively of a single HDPE resin, a mixture of HDPE resins, or of HDPE cont~ining up to lO
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 l.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/cm3 or higher and a melt index of greater than 0.5 to 2.0; l to 25 weight percent, preferably 3 to 8 weight percent, of HDPE having a density of 0.96 g/cm3 or greater and a melt index of O.l to 0.5;
and l to 25 weight percent, preferably 3 to 8 weight WO96/05051 ~ 9 4 1 61 PCT~S95/10113 percent, of HDPE having a density of 0.96 g/cm3 or higher and a melt index of greater than 2 to 8. Preferably, the ~econd 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. For example 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. For example, 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. Examples 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. For example, it has been determined that the films of this invention having a W096/OS051 2 t ~ 4 7 6 7 PCT~S95/10113 thickness of 1.0 to 1.2 mils will have acceptable WVTR of less than 0.28 g-mil/100 in2/24 hr/1 atm (less than 4.34 x 10-4 g-mil/cm2/24 hr/l atm).
In the usual manner 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. Typically, 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.
It is found that when utilizing a laminate in accordance with this invention in the fabrication of bags then, whatever the present system used, the propagation of the tear is always in the TD. This provides not only control of opening but also enables the consumer to utilize the lower tear edge as a pouring lip.
Furthermore, the dead-fold of the oriented HDPE enables, simply by twisting or folding, the bag to be reclosed.
None of these advantages is present unless the HDPE is laminated in accordance with this invention.
The following Examples illustrate the invention.
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:
E : excellent G : good M : medium F : fair B : bad Wos6/ososl 2 1 ~ 4 7 6 7 PCT~S95/10113 TABLE
Directional Reclosability Laminates Tear TwistFolding 12 Pet/30 LLDPE F F B
20 PP/30 HDPE~ E G M
40 g Paper/30 HDPE E E G
40 g Paper/30 LLDPE B G M
where:
PET represents polyethylene terephthalate HDPE represents biaxially oriented HDPE
PP represents biaxially oriented polypropylene LLDPE represents linear low density polyethylene PA represents oriented nylon 40g Paper represents paper having a weight of 40 g per sq. metre DRTD = 8.0 and DRMD = 1.18
Claims (15)
1. A laminate which comprises:
(i) a film of high density polyethylene laminated to (ii) an oriented web wherein (i) is biaxially oriented such that the ratio of the deformation ratio in the transverse direction to the deformation ratio in the machine direction is greater than 1.
(i) a film of high density polyethylene laminated to (ii) an oriented web wherein (i) is biaxially oriented such that the ratio of the deformation ratio in the transverse direction to the deformation ratio in the machine direction is greater than 1.
2. A laminate according to claim 1 wherein the deformation ratio in the transverse direction is from 6 to 12 while the deformation ratio in the machine direction is from 1.1 to 2.
3. A laminate according to claim 1 wherein the high density polyethylene has a density of at least 0.94 g/cm3.
4. A laminate according to claim 1 wherein the high density polyethylene has a melt index from greater than 0.5 to 2Ø
5. A laminate according to claim 1 wherein (ii) comprises a biaxially oriented plastic film.
6. A laminate according to claim 5 wherein the oriented plastic film of (ii) comprises an olefin polymer.
7. A laminate according to claim 6 wherein the olefin polymer is polypropylene.
8. A laminate according to claim 1 which is fabricated into a bag.
9. Method for manufacturing a laminate film comprising high density polyethylene film which comprises biaxially orienting said high density polyethylene film such that the ratio of the deformation ratio in the transverse direction to the deformation ratio in the machine direction is greater than 1, and laminating said biaxially oriented high density polyethylene film to an oriented web.
10. The method of claim 9 wherein the deformation ratio in the transverse direction is from 6 to 12 while the deformation ratio in the machine direction is from 1.1 to 2.
11. The method of claim 9 wherein the high density polyethylene has a density of at least 0.94 g/cm3.
12. The method of claim 9 wherein the high density polyethylene has a melt index from greater than 0.5 to 2Ø
13. The method of claim 9 wherein the oriented web comprises a biaxially oriented plastic film.
14. The method of claim 13 wherein the oriented plastic film of the oriented web comprises an olefin polymer.
15. The method of claim 14 wherein the olefin polymer of the oriented web is polypropylene.
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 |
|---|---|
| CA2194767A1 true CA2194767A1 (en) | 1996-02-22 |
Family
ID=10759693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002194767A Abandoned CA2194767A1 (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) |
Families Citing this family (1)
| 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 |
Family Cites Families (13)
| 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 |
| GB8315001D0 (en) * | 1983-06-01 | 1983-07-06 | Ici Plc | Multiple-layer polyolefin films |
| US4870122A (en) * | 1987-09-28 | 1989-09-26 | Mobil Oil Corporation | HdPE films with imbalanced biaxial orientation |
| US5006378A (en) * | 1987-11-13 | 1991-04-09 | Toa Neryo Kogyo Kabushiki Kaisha | Polyethylene composite film |
| 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 |
| EP0465681B1 (en) * | 1990-01-30 | 1997-03-26 | Nippon Petrochemicals Co., Ltd. | Monoaxially oriented multilayered packaging material |
| 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 (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 CA CA002194767A patent/CA2194767A1/en not_active Abandoned
- 1995-08-09 EP EP95928366A patent/EP0777573A4/en not_active Ceased
- 1995-08-09 WO PCT/US1995/010113 patent/WO1996005051A1/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0777573A4 (en) | 1998-09-30 |
| GB9416183D0 (en) | 1994-09-28 |
| EP0777573A1 (en) | 1997-06-11 |
| WO1996005051A1 (en) | 1996-02-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |