WO1989000892A1 - Process for preserving products giving rise to gaseous exchange with their environment and package used for this purpose - Google Patents
Process for preserving products giving rise to gaseous exchange with their environment and package used for this purpose Download PDFInfo
- Publication number
- WO1989000892A1 WO1989000892A1 PCT/FR1988/000368 FR8800368W WO8900892A1 WO 1989000892 A1 WO1989000892 A1 WO 1989000892A1 FR 8800368 W FR8800368 W FR 8800368W WO 8900892 A1 WO8900892 A1 WO 8900892A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- membrane
- packaging
- window
- giving rise
- gas
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/24—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants
Definitions
- the subject of the present invention is a method for preserving food products giving rise to gas exchanges with the ambient medium during their storage and a packaging making it possible to achieve this conservation.
- packaging for fruit and vegetables consisting of a material that is practically impermeable to gases, comprising one or more windows made using a semi-permeable gas membrane made of silicone rubber allowing , by playing on the surface of said window, of modulating the gas exchanges according to the nature and the quantity of the packaged food products.
- a semi-permeable gas membrane made of silicone rubber allowing , by playing on the surface of said window, of modulating the gas exchanges according to the nature and the quantity of the packaged food products.
- such packaging has a drawback linked to the very nature of the membrane.
- the latter in fact consists of a non-porous silicone elastomer film through which gas exchanges occur according to a diffusion-solution mechanism.
- this type of membrane has good selectivity but low gas flow rates. These flow rates can only be increased by reducing the thickness of the membrane.
- a first objective of the invention resides in a method of packaging products giving rise to gas exchanges with the ambient medium making it possible to ensure good conservation of said products by ensuring gas exchanges either in a controlled manner or without modifying them.
- a second objective which the present invention proposes to achieve resides in a packaging method making it possible to meet the requirements of presentation of food products, of handling and of storage by the use of sealed packages which are themselves known and used in the field of distribution.
- a first object of the invention resides in a method of preserving food products giving rise to gas exchanges with the ambient environment, characterized in that said products are introduced into a container made of a material practically impermeable to gases comprising at least a window constituted by a microporous membrane.
- a second object of the invention resides in a packaging for the preservation of food products giving rise to gas exchanges comprising walls which are practically gas tight and at least one window ensuring gas exchanges with the ambient medium, characterized in that said window is made with a microporous membrane.
- microporous membrane is meant, within the meaning of the present invention, films of polymeric materials of varied nature having pores of diameter less than or equal to 20 ⁇ m and more particularly of diameter between 0.005 and 20 ⁇ m.
- These membranes can have a symmetrical or asymmetrical structure (isotropic or anisotropic membrane).
- Isotropic membranes have a homogeneous pore size in their thickness, unlike anisotropic membranes which are characterized by the presence of a thin non-porous layer (dense layer) or with very fine porosity (pores less than 0.1 ⁇ m) and a layer with higher porosity.
- the choice between isotropic membrane and anisotropic membrane depends on the nature of the product to be preserved.
- anisotropic membranes which exhibit greater selectivity in gas exchange.
- symmetrical membranes can be used simply ensuring the entry of oxygen and the departure of the carbon dioxide and the water vapor produced.
- the thickness the membrane and the size of the pores are chosen according to various factors such as in particular the nature and the quantity of the product present in the packaging; it is well known that the volume of gas exchanges varies from one product to another.
- the membrane surface of given structure, thickness and porosity present on the packaging essentially depends on the volume of gas exchanges to be ensured and, consequently, on the nature and the quantity of the product present in the packaging.
- This surface can be distributed in one or more windows (s) placed on one or more walls of the container.
- the thickness of the membrane can vary within wide limits and depends to a large extent on the nature of the material constituting the membrane and on the structure of the latter. In general, this thickness is between 10 and 1000 ⁇ m and preferably between 20 and 500 ⁇ m
- the membranes can be used alone or in combination with a material intended to reinforce their mechanical properties and / or to facilitate handling.
- This frame can be constituted by macroporous materials: paper, fabric, net, knitting or non-woven assemblies, in natural or synthetic fibers.
- the frame can also act as a junction material between the membrane and the material constituting the wall of the package to which it must be tightly fixed.
- the nature of the material constituting it is chosen as a function of the nature of the wall of the packaging.
- the membrane reinforcement consists of a fabric or nonwoven based on fibers.
- polyester for example a heat sealable polyester such as terephthalic acid / isophthalic acid / ethylene glycol copolyesters.
- the thickness of the frame is not critical; it is chosen to give the membrane sufficient mechanical strength and / or to facilitate handling.
- microporous polyvinyl chloride membranes see French patent 2,105,305; acrylic polymers (see French patent No. 7,035,526 published under No. 2,109,104); in sulfonated polyarylether sulfones (cf. French patents No. 59/13 810 published under No. 2,040,950; No. 70,04620 published under No. 2,079,699; No. 74/42,874 published under No. 2,295,979) ; in phenolic polyethers (cf. French patents No. 70/38 734 published under No.
- the container constituting the packaging can take various forms: cube, rectangular parallelepiped, pyramid, trunk of pyramid, prism, straight or oblique, volume of trapezoidal shape, cylinder etc. It is made of any material practically impermeable to gases. For this purpose, use can be made of metals (aluminum for example), alloys, polymers such as polyvinyl chloride, polystyrene, styrene copolymers, polyamides (nylon-6,6 for example), polyesters: polyethylene terephthalate, copolyesters derived from terephthalic acid and other aromatic diacids (eg isophthalic acids) or aliphatic (adipic acid) and glycol (ethylene glycol, cyclohexadimethanol, neopentylglycol).
- metals aluminum for example
- alloys polymers such as polyvinyl chloride, polystyrene, styrene copolymers, polyamides (nylon-6,6
- the gas-impermeable packaging can be produced by means of a composite film consisting of a film of polyethylene terephthalate coated with an aluminum layer on one of its faces by metallization under empty.
- the microporous membrane window is fixed tightly to the packaging by the usual methods such as bonding, heat sealing, ultrasonic welding.
- the choice of this method depends essentially on the nature of the materials constituting the wall of the package and the window.
- This fixing is preferably carried out with an overlap between the wall and the membrane constituting the window sufficient to seal the assembly.
- the shape of the window is obviously not critical. For obvious practical reasons, use is preferably made of square, rectangular or circular windows which can be easily fitted out by stamping.
- the packages according to the present invention can have variable dimensions. By way of nonlimiting example, they can have a useful volume of between 0.25 and 1000 liters, although the latter value can be exceeded without departing from the scope of the invention.
- the window microporous membrane window packages of the invention are particularly suitable for packaging small quantities of food products intended for retail sale. These are then packages having a useful volume of between 0.25 and 10 liters.
- the packaging according to the invention is suitable for preservation during storage and transport of all food products giving rise to gas exchanges with the ambient environment from harvest to distribution. They are particularly suitable for packaging vegetables such as mushrooms, cauliflowers, broccoli; green vegetables such as salads, spinach, parsley, beans, gourmet peas, asparagus; fruits such as tomatoes, eggplant, zucchini, bananas, cherries, strawberries, grapes, apples, pears. They are also well suited to the conservation of cheeses, of which they allow further ripening, possibly in a controlled manner by a judicious choice of the microporous window;
- the packaging according to the invention containing the food products can naturally be stored in a refrigerated enclosure whose temperature is chosen according to the nature of the packaged product, expected duration of storage, degree of ripening with regard to fruit. In general the temperature is between 8 and 16 ° C.
- a tray of internal dimensions 18 x 16 x 3.5 cm was produced, provided with a flat rim 1 cm wide by stamping a laminate consisting of a 0.2 mm thick cardboard sheet coated with '' a polyester film 35 ⁇ m thick metallized, on the face opposite to that in contact with the cardboard, by a layer of aluminum.
- the metallized polyester film constitutes the interior of the tray and ensures its impermeability to gases.
- a 2.5 cm diameter window was cut by stamping, then a 3 cm diameter disc was placed on the orifice thus created.
- asymmetric microporous membrane based on a mixture of polysulfone and sulphured polysulfone described in French patent n ° 74/42 874 published under n ° 2 295 979.
- This 160 ⁇ m thick membrane is made mechanically resistant by connection to a polyester weft which is a single-strand square mesh fabric with a thickness equal to 110 ⁇ m.
- This membrane has a pore size skin between 50 and 100 ° A and a pore size base layer between 0.1 and 1 ⁇ m.
- the membrane disc is placed on the circular window so that the polyester weft is in contact with the metallized coating on the internal face of the tray. One then proceeds to the welding of the membrane window by ultrasound.
- the membrane window allows the following gas exchanges:
- oxygen input 0.125.1 per day
- carbon dioxide outlet; 250 g of a soft cheese are introduced into the tray and then a cover consisting of a metallized heat-sealable polyester film is sealed on the upper face of the tray.
- the container After one month of storage of the container at 12 ° C., the container is opened. It can be seen that the cheese is in a perfect state of preservation and that it has not given rise to any development of molds or fungi.
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Packging For Living Organisms, Food Or Medicinal Products That Are Sensitive To Environmental Conditiond (AREA)
- Packages (AREA)
- Storage Of Fruits Or Vegetables (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR87/10852 | 1987-07-28 | ||
FR8710852A FR2618751B1 (en) | 1987-07-28 | 1987-07-28 | PROCESS FOR THE PRESERVATION OF PRODUCTS GIVEN TO GAS EXCHANGES WITH THE ENVIRONMENT AND PACKAGING USED FOR THIS PURPOSE |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1989000892A1 true WO1989000892A1 (en) | 1989-02-09 |
Family
ID=9353744
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1988/000368 WO1989000892A1 (en) | 1987-07-28 | 1988-07-13 | Process for preserving products giving rise to gaseous exchange with their environment and package used for this purpose |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0377593A1 (en) |
BR (1) | BR8804437A (en) |
ES (1) | ES2009629A6 (en) |
FR (1) | FR2618751B1 (en) |
GR (1) | GR1000084B (en) |
WO (1) | WO1989000892A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0335682A1 (en) * | 1988-03-31 | 1989-10-04 | Hercules Incorporated | Water-permeable controlled atmosphere packaging device from cellophane and microporous film |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5397408A (en) * | 1994-05-23 | 1995-03-14 | Motorola, Inc. | Ultrasonic welding of metallized plastic |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1567996A (en) * | 1967-12-29 | 1969-05-23 | ||
FR2079699A6 (en) * | 1969-04-30 | 1971-11-12 | Rhone Poulenc Sa |
-
1987
- 1987-07-28 FR FR8710852A patent/FR2618751B1/en not_active Expired - Fee Related
-
1988
- 1988-07-08 GR GR880100454A patent/GR1000084B/en unknown
- 1988-07-13 EP EP19880907001 patent/EP0377593A1/en not_active Ceased
- 1988-07-13 WO PCT/FR1988/000368 patent/WO1989000892A1/en not_active Application Discontinuation
- 1988-07-27 ES ES8802360A patent/ES2009629A6/en not_active Expired
- 1988-08-26 BR BR888804437A patent/BR8804437A/en not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1567996A (en) * | 1967-12-29 | 1969-05-23 | ||
FR2079699A6 (en) * | 1969-04-30 | 1971-11-12 | Rhone Poulenc Sa |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0335682A1 (en) * | 1988-03-31 | 1989-10-04 | Hercules Incorporated | Water-permeable controlled atmosphere packaging device from cellophane and microporous film |
Also Published As
Publication number | Publication date |
---|---|
FR2618751B1 (en) | 1990-01-26 |
ES2009629A6 (en) | 1989-10-01 |
BR8804437A (en) | 1989-03-28 |
EP0377593A1 (en) | 1990-07-18 |
GR880100454A (en) | 1989-04-12 |
FR2618751A1 (en) | 1989-02-03 |
GR1000084B (en) | 1990-12-31 |
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