WO2002090113A1 - Film made of thermoplastic resin, which may be used for packaging foods - Google Patents
Film made of thermoplastic resin, which may be used for packaging foods Download PDFInfo
- Publication number
- WO2002090113A1 WO2002090113A1 PCT/IT2002/000297 IT0200297W WO02090113A1 WO 2002090113 A1 WO2002090113 A1 WO 2002090113A1 IT 0200297 W IT0200297 W IT 0200297W WO 02090113 A1 WO02090113 A1 WO 02090113A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pvc
- film according
- film
- eva
- stretchable
- 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
- 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
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/22—Layered products comprising a layer of synthetic resin characterised by the use of special additives using plasticisers
-
- 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
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
-
- 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
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
-
- 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
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
-
- 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
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
-
- 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
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
- B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
-
- 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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- 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
-
- 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
- B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
-
- 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
- B32B2307/732—Dimensional properties
- B32B2307/734—Dimensional stability
- B32B2307/736—Shrinkable
-
- 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
-
- 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
- B32B2325/00—Polymers of vinyl-aromatic compounds, e.g. polystyrene
-
- 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
- B32B2331/00—Polyvinylesters
-
- 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
- B32B2439/70—Food packaging
Definitions
- the aim of the present invention is to keep the PVC film still stretchable and thus suitable for use, but make it inert, that is to say prevent the transfer of foreign substances to the packaged food.
- the subject of the invention is a stretchable film made of synthetic resin, which can be used for packaging foods, characterized in that it comprises an internal thickness made of polyvinyl chloride (PVC) with plasticizers that may be of the phthalate type, and thin external thicknesses made of non-toxic thermoplastic synthetic resins and the like to block the transmission of particles present in the PVC.
- Said thin external thicknesses may consist of substances included in the group comprising polystyrene (PS), ethylene/vinyl acetate (EVA), polyethylene (PE), ionomeric resins (Surlyn), polybutadiene, "K” resins and the like, and also resins such as Barex, EVOH, Nylon, etc. capable of making the film impermeable to gases so as to allow the product to be wrapped under vacuum or in a modified atmosphere to keep the wrapped product fresh for longer.
- PS polystyrene
- EVA ethylene/vinyl acetate
- PE polyethylene
- the stretchable PVC film with another two (minimum) layers outside the PVC, made of other thermoplastic materials, for instance polystyrene (PS), ethylene/vinyl acetate (EVA), ionomeric resins such as "Surlyn", polybutadiene, "K” resin and various others, which block the migration of particles present in the PVC and which are non-toxic.
- PS polystyrene
- EVA ethylene/vinyl acetate
- ionomeric resins such as "Surlyn", polybutadiene, "K” resin and various others, which block the migration of particles present in the PVC and which are non-toxic.
- the co-extrusion must be of at least three layers since, otherwise, the problem of transfer would not be eliminated; it is essential that the stretchable PVC film must be in an internal structure, and thus isolated.
- Co-extrusion with three or more layers may be envisaged, which may be carried out as for normal extrusion, either from the top downward or, conversely, from the bottom upward.
- the mechanical properties of the film are maintained unaltered, these properties being intrinsic to PVC - especially the elastic memory, the stretchability, the rupture strength and the chemical properties, for instance the equilibrated permeability to atmospheric agents.
- the wrapped product - such as meat, cheese and the like - remains free of foreign substances, which cannot be transferred from the PVC packaging film, due to the isolation provided by the two external layers of the sandwich.
- the film with three or more layers may be suitably supplemented with "antifog” substances, so as to make the multiple film totally transparent.
- the PS/PVC/PS structure may also be used in automated or manual machines, with a particular type of sealer which is already the subject of another previous patent (Italian patent application No. FI2000A000161 of July 11 , 2000) from the same inventor.
- a plasticized PVC- based film of this type may also be produced with heat-shrinkability properties, again constructed with a minimum of three layers, with the "two- bubble" system - the invention consists in obtaining a stretchable film by co- extrusion of three or more layers, in which the main layer is made of plasticized PVC.
- FIG. 1 shows, on a very enlarged scale, a film made according to the invention
- Figs. 2 and 3 are sketches of construction schemes for producing a film according to the invention, of stretchable and heat-shrinkable type.
- Fig. 1 indicates the internal thickness of stretchable polyvinyl chloride (PVC) with various additives including plasticizers that may be of the phthalate type, for instance dioctyl phthalate (DOP), and 3 and 5 indicate two thin layers of EVA stretchable polystyrene (PS).
- PVC polyvinyl chloride
- DOP dioctyl phthalate
- PS EVA stretchable polystyrene
- the layers 3 and 5 may also be made of other synthetic resins, which may be identical or different.
- Fig. 2 shows a scheme of a plant with a co-extrusion die 11 , of which 13 indicates two of the three or four or more extruders that feed this die.
- the bubble B1 being produced downward passes between two rollers 15 and may be collected by a rotating unit 17 to make a stretchable film.
- the material in film form is conveyed along a path P1 to an oven 19, and is then collected in an essentially identical manner.
- Fig. 3 shows a scheme of a plant with an extrusion die 111 , of which 113 indicates one of the extruders feeding it.
- the bubble B2 is produced upward to reach a set of rollers 115, after which the material may be collected as a stretchable film at 117, or diverted into the path P2 leading to an oven 119, after which the heat-shrinkable film is collected.
- the same path may be envisaged to collect the stretchable film without running the oven.
- a heat-shrinkable film may also be prepared by the "two-bubble" system.
Landscapes
- Laminated Bodies (AREA)
- Wrappers (AREA)
- Packages (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITFI2001A000085 | 2001-05-10 | ||
IT2001FI000085A ITFI20010085A1 (en) | 2001-05-10 | 2001-05-10 | AN EXTENDABLE FILM IN THERMOPLASTIC RESIN, USABLE FOR FOOD PACKAGES |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002090113A1 true WO2002090113A1 (en) | 2002-11-14 |
Family
ID=11442189
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IT2002/000297 WO2002090113A1 (en) | 2001-05-10 | 2002-05-06 | Film made of thermoplastic resin, which may be used for packaging foods |
Country Status (4)
Country | Link |
---|---|
AR (1) | AR033882A1 (en) |
IT (1) | ITFI20010085A1 (en) |
UY (1) | UY27286A1 (en) |
WO (1) | WO2002090113A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004041536A1 (en) * | 2002-11-05 | 2004-05-21 | Vismore Company S.A. | Stretchable thermoplastic resin film, for use in the packaging of food |
WO2009026194A1 (en) * | 2007-08-21 | 2009-02-26 | E. I. Du Pont De Nemours And Company | Product comprising ionomer and plasticizer |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4855181A (en) * | 1986-12-12 | 1989-08-08 | Kuraray Co., Ltd. | Laminate with a blend layer of polyesteramide and ethylene-vinyl acetate copolymer |
US6214477B1 (en) * | 1998-07-17 | 2001-04-10 | Cryovac, Inc. | Multilayer film with polyolefin and polyvinyl chloride |
-
2001
- 2001-05-10 IT IT2001FI000085A patent/ITFI20010085A1/en unknown
-
2002
- 2002-05-06 WO PCT/IT2002/000297 patent/WO2002090113A1/en not_active Application Discontinuation
- 2002-05-09 AR ARP020101687A patent/AR033882A1/en unknown
- 2002-05-10 UY UY27286A patent/UY27286A1/en unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4855181A (en) * | 1986-12-12 | 1989-08-08 | Kuraray Co., Ltd. | Laminate with a blend layer of polyesteramide and ethylene-vinyl acetate copolymer |
US6214477B1 (en) * | 1998-07-17 | 2001-04-10 | Cryovac, Inc. | Multilayer film with polyolefin and polyvinyl chloride |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004041536A1 (en) * | 2002-11-05 | 2004-05-21 | Vismore Company S.A. | Stretchable thermoplastic resin film, for use in the packaging of food |
WO2009026194A1 (en) * | 2007-08-21 | 2009-02-26 | E. I. Du Pont De Nemours And Company | Product comprising ionomer and plasticizer |
US7858681B2 (en) | 2007-08-21 | 2010-12-28 | E. I. Du Pont De Nemours And Company | Product comprising ionomer and plasticizer |
Also Published As
Publication number | Publication date |
---|---|
ITFI20010085A1 (en) | 2002-11-10 |
AR033882A1 (en) | 2004-01-07 |
UY27286A1 (en) | 2002-09-30 |
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