EP0729900A2 - Procédé d'emballage - Google Patents

Procédé d'emballage Download PDF

Info

Publication number
EP0729900A2
EP0729900A2 EP96102512A EP96102512A EP0729900A2 EP 0729900 A2 EP0729900 A2 EP 0729900A2 EP 96102512 A EP96102512 A EP 96102512A EP 96102512 A EP96102512 A EP 96102512A EP 0729900 A2 EP0729900 A2 EP 0729900A2
Authority
EP
European Patent Office
Prior art keywords
tray
lid
heat
temperature
axially oriented
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.)
Granted
Application number
EP96102512A
Other languages
German (de)
English (en)
Other versions
EP0729900B1 (fr
EP0729900A3 (fr
Inventor
Jean Denis Sornay
Philippe Gomes Da Silva
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.)
Cryovac LLC
Original Assignee
Grace SA
WR Grace and Co Conn
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 Grace SA, WR Grace and Co Conn filed Critical Grace SA
Priority to EP19960102512 priority Critical patent/EP0729900B1/fr
Publication of EP0729900A2 publication Critical patent/EP0729900A2/fr
Publication of EP0729900A3 publication Critical patent/EP0729900A3/fr
Application granted granted Critical
Publication of EP0729900B1 publication Critical patent/EP0729900B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/10—Container closures formed after filling
    • B65D77/20—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
    • B65D77/2024—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers the cover being welded or adhered to the container

Definitions

  • the present invention refers to an improved method for packaging goods, particularly food products, with plastics materials and to the package thus obtained.
  • plastics material bases such as thermoformed or injection moulded trays
  • packaging goods particularly in packaging food products.
  • the package is closed by applying a plastic lid on top of the tray which is then heat sealed to the tray rims.
  • a web of plastics material is provided over the top of the tray containing the product in a lid sealing station which comprises a lower chamber and an upper chamber.
  • the upper chamber includes a heated platen which may comprise one or more frames which, when the upper chamber and the lower chamber are closed together, press the lid(s) onto the rims or peripheral lips of the tray(s), in their turn supported by a similarly framed anvil, thus sealing them together.
  • the temperature at which the sealing frames are heated in order to seal the package depends on the machines and the materials used for the heat-sealing layers of both the tray and the lid. In general however temperatures between about 110 and about 160°C are suitable for any type of heat-sealing layer. Typically however temperatures of between about 120 and between about 140°C are employed.
  • Suitable cutting means finally allow the separation of the trays and the removal of excess plastics material from the lidstock web.
  • the platen which descends to heat-seal the lidstock to the flat top lips of the trays is wholly heated.
  • the plate is preferably covered with a non-sticky material such as a polytetrafluoroethylene (Teflon®) tape, to avoid problem of sticking of the film to the heated platen.
  • Teflon® polytetrafluoroethylene
  • a suitable gas or gas mixture which is used to enhance the shelf-life of the packaged goods (Modified Atmosphere Packaging).
  • This may be an inert gas, typically nitrogen, or another gas which will enhance the keeping qualities of the goods, such as carbon dioxide, mixtures of two or more gases such as mixtures of carbon dioxide and nitrogen, of carbon dioxide and oxygen, or of oxygen, carbon dioxide and nitrogen in suitable proportions.
  • This modified atmosphere can be obtained by flushing the desired gas between the lid and the tray in the lid sealing station prior and until the package is sealed.
  • the modified atmosphere is obtained by closing the upper and lower chambers together, evacuating air through suitable air passageways which are indicated in Fig. 3 and 4 as (13), admitting the desired modified atmosphere into the closed upper and lower chambers so as to provide the desired modified atmosphere between the lid and the tray and then lowering the platen to seal the lid to the tray rims.
  • lid material which is relatively thick, is typically obtained by extrusion or coextrusion of the selected polymer(s) or polymer blend(s) by conventional methods which do not involve any orientation of the obtained thermoplastics sheet (so-called "cast” extrusion or coextrusion).
  • the lid material is produced by methods which do involve mono-axial or bi-axial orientation of the obtained sheet but - in addition thereto - also a heat-setting step of the oriented product.
  • the obtained film is then typically glue laminated to or coated with other materials to provide for e.g. the desired heat-sealability, or other desired properties.
  • heat-stability has been considered as an essential feature for the materials to be used as lidstock in this type of applications.
  • Suitable bi-axially oriented heat-shrinkable films are those films which comprise at least a heat-sealable skin layer and are characterized by a maximum shrink force, at the temperature which is attained in the area of the lid-sealing station, not higher than 0.05 kg/cm in at least the transversal direction.
  • the temperature attained in the area of the lid sealing station causes a shrink of the sealed lid which keeps it tight on top of the tray.
  • thinner material provides improved optics and to reduced plastics waste.
  • a first object of the present invention is therefore in a packaging method which comprises :
  • the conventional lidding machines which are currently run with heat stable lidstocks can be used for this application, such as for instance the Ross Reiser, Caveco Automa, Caveco STL, Mecaplastic 2001, and Multivac T500 machines.
  • the lid web is cut after sealing and more preferably cutting occurs immediately after sealing while still in the lid sealing chamber.
  • some of the available tray lidding machines may require a mechanical modification.
  • a second object of the present invention is a package comprising a product placed in a tray and a lid heat-sealed to the tray rims, optionally with a modified atmosphere between said lid and said tray, wherein the lid is made of a bi-axially oriented heat-shrinkable film which is characterized in that it has a maximum shrink force, at the temperature which is attained in the area of the lid-sealing station, not higher than 0.05 kg/cm in at least the transversal direction.
  • bi-axially oriented is used to define a polymeric material which has been heated and stretched in the longitudinal as well as in the transverse direction to align the macromolecule configuration.
  • heat-shrinkable film is intended to refer to a film that, when exposed at the temperature of 110°C for 5s, shrinks by at least 5 % in both transverse and longitudinal directions.
  • the bi-axially oriented heat-shrinkable films to be used as tray liddings are not required to have a very high free shrink at the temperature which is attained in the area of the lid sealing station.
  • a free shrink of 5 to 10% in both directions would be more than sufficient to provide for the desired tight aspect of the lidding.
  • films with higher % free shrink are generally employed.
  • bi-axially oriented heat-shrinkable films are used in the improved process according to the present invention that have a free shrink, at the temperature which is attained in the area of the lid sealing station, of at least 10 %, preferably at least 15 %, and more preferably at least 20 %. More generally films with a % free shrink up to 60-70 at the temperature which is attained in the area of the lid sealing station can suitably be employed.
  • Bi-axially oriented heat-shrinkable films as described above can be obtained for instance by the trapped bubble process developed by Cryovac® in the early sixties.
  • the polymer(s) or polymer blend(s) of the film layer or layers are extruded or co-extruded through a round die to give a primary tube. This is rapidly quenched, for instance by means of a water bath, then heated to a suitably selected temperature by hot water or air, and oriented in the transverse direction by internal air pressure, and in the longitudinal direction by a differential speed of the pinch-rolls which hold the trapped bubble.
  • a tube is thus obtained of a film which has a reduced thickness with respect to the primary tube, whereas the ratio between the diameter of this tube and that of the primary tube is called transverse racking (or orientation) ratio and the ratio between the speed of the pinch rolls which stretch the bubble with respect to that of the pinch rolls which keep the primary tube gives the longitudinal racking ratio.
  • bi-axially oriented heat-shrinkable multilayer films may also be obtained by extrusion coating wherein a primary tube of one or more layers is coated with the other layers which are either sequentially extruded or coextruded thereon in a single step and then oriented as indicated above.
  • the films may also be subjected to cross-linking treatments, generally by submitting them to energetic radiation treatments, typically by high energy electron treatment.
  • irradiation is most preferably, but not necessarily, performed prior to orientation.
  • suitable radiation dosages of high energy which are referred to herein in terms of the radiation units "Grays", with one thousand Grays being designated as “KGrays”, may be in the range of up to 120 KGrays, more preferably from about 10 to about 90 KGrays.
  • the irradiation step may be carried out on the first tube obtained in the two-step extrusion process, before the extrusion coating thereof.
  • An alternative method for the manufacture of bi-axially oriented heat-shrinkable films as defined herein is by extrusion or co-extrusion through a flat die over a chill roll (optionally followed by an extrusion- or co-extrusion-coating step) and stretching of the thus obtained thick sheet in the transverse and longitudinal directions by the so-called tenterframe technique. Stretching in the longitudinal direction is usually achieved by passing the sheet, heated at the suitably selected orientation temperature, through pairs of rolls which rotate at different speeds, while stretching in the transverse direction is performed in a tenterframe oven heated to the suitably selected orientation temperature which comprises suitable stretching means. Said stretching steps can be carried out sequentially or simultaneously.
  • the tenterframe technique is actually used industrially for the manufacture of heat-set structures by carrying out, after the orientation step, a heat treatment - called heat-setting - wherein the films, while restrained against shrinkage, are heated at a temperature above the glass transition temperature of the polymers and below their melting points to stabilize the molecules in the oriented state and eliminate completely the shrinkage.
  • the stretching ratios in this case can be selected into a wider range as they may be up to 11 : 1, or even 12 : 1.
  • the percent free shrink i.e. the irreversible and rapid reduction, as a percent, of the original dimensions of a sample subjected to a given temperature under conditions where nil restraint to inhibit shrinkage is present, has been measured according to ASTM method D 2732, by immersing for 5s specimens of the structures (100 mm x 100 mm) in a water or oil bath set at the temperature at which the shrink properties of the structure were to be evaluated, by means of a free shrink holder. The specimens were then removed from the bath, quickly immersed into a water bath at room temperature to cool them down and the linear dimensions of the specimens in both the longitudinal and transverse directions were recorded.
  • L o is the initial length of side and L f is the length of side after shrinking.
  • suitable films are those heat-shrinkable films that, when tested according to the ASTM method D-2732 at the temperature which is attained by the air or the modified atmosphere in the lid sealing station, show a free shrink of at least 5 % in both directions.
  • Preferred heat-shrinkable films are however those showing a free shrink of at least 10 %, preferably at least 15 %, and more preferably at least 20 % in both directions.
  • suitable heat-shrinkable films need to be characterized by a low shrink force.
  • shrink tension The shrink force which is the force released by the material during the shrinking process, when referred to the structure cross-section is termed shrink tension.
  • thermocouples The signal supplied by the thermocouples was amplified and sent to an output connected to the "X" axis of an X/Y recorder.
  • the signal supplied by the load cell was amplified and sent to an output connected to the "Y" axis of the X/Y recorder.
  • the impeller started blowing hot air and the force released by the sample was recorded in grams.
  • the temperature was increased up to a preselected maximum at a rate of 2°C/s. As the temperature increased the pen drew on the X/Y recorder the measured profile of the shrink force versus the temperature.
  • the instrument produced a curve of shrink force (g) versus temperature (°C); dividing the values thus recorded and multiplied by 10 -3 , by the specimen width (cm) the shrink force (in kg/cm) was obtained. By further dividing the shrink force by the specimen thickness (in cm), the shrink tension in kg/cm 2 was obtained at each given temperature.
  • the heat-shrinkable films to be used in the packaging method of the present invention should have, at the temperature which is attained by the air or the modified atmosphere in the lid sealing station, a shrink force not higher than 0.05 kg/cm at least in the transversal direction.
  • polymer(s) and polymer blend(s) which can be employed in order to get heat-shrinkable films to be used in the packaging method according to the present invention may vary widely as known in this field in order to provide the film with the desired mechanical, optical, and gas-permeability properties.
  • the desired shrink force characteristics of the heat-shrinkable films to be used as tray liddings in the process of the present invention might be obtained by suitably setting the key parameters in the manufacturing process (using low racking ratios, and/or high orientation temperatures), suitably selecting the polymers to be used and/or their sequence in the case of multilayer structures, reducing the shrink force of the available films by submitting them to a heat treatment under specific conditions, or by a combination of all these measures. Since, as indicated above, the shrink force also depends on the thickness of the structure, it may be possible to obtain a suitable structure having the shrink force characteristics below the above limits by reducing the thickness of otherwise unsuitable thicker structures.
  • the minimum thickness which can be used in the packaging method according to the present invention will depend on other characteristics required by the package in the specific application, such as mechanical resistance, gas-permeability, if a gas barrier package is desired, the need for tie layers to improve the bond, etc. and will depend on the particular mono- or multi-layer structure employed.
  • films as thin as 10 ⁇ can be employed, whereas balancing the several properties, heat-shrinkable films of an average thickness of from about 14 to about 40 ⁇ , e.g. 15 ⁇ , 19 ⁇ , 25 ⁇ , 30 ⁇ , or 35 ⁇ , are preferred.
  • Structures which may be employed in the packaging method and package according to the present invention are for instance those described in US-A-4,551,380, US-A-4,532,189, EP-A-388,177, EP-A-457,598, GB-A-2,221,649, WO-91/17886 and EP-A-206,826 or, when a gas barrier layer is desired, in EP-A-217,596, EP-A-251,769, EP-A-87,080, EP-A-141,555, and PCT patent application no. PCT/US95/16202 filed on December 15, 1995.
  • thermoformed tray When a thermoformed tray is employed this will typically be made of a mono- or multilayer thermoplastic material which may be gas permeable or a gas barrier material and comprises a heat-sealable inner skin layer (6) or heat-sealable strips on at least the tray rims (7).
  • gas permeable materials which can be used for the manufacture of thermoformed trays are e.g. multilayer laminates comprising a PVC layer and a polyethylene inner skin layer to provide the required heat-sealability, or in more general terms laminates comprising a PVC layer and an inner and optionally outer coating layer of any heat-sealable material which can heat-seal with the selected lid material.
  • thermoformed gas permeable trays can be obtained by thermoforming polystyrene sheet, either foamed or unfoamed, having a surface layer of a heat-sealable thermoplastic and an intermediate bonding layer.
  • a gas barrier thermoformed tray When a gas barrier thermoformed tray is desired this will typically be made of a multilayer structure comprising a gas barrier layer, such as for instance a layer comprising PVDC, EVOH, a poly- or copolyamide, etc. as known in this field, and at least the inner skin layer of a heat-sealable material. Other layers may clearly be present in order to provide the structure with the thickness and the mechanical properties required.
  • a gas barrier layer such as for instance a layer comprising PVDC, EVOH, a poly- or copolyamide, etc. as known in this field
  • Other layers may clearly be present in order to provide the structure with the thickness and the mechanical properties required.
  • barrier thermoformable structures are described for instance in US-A-4,735,855.
  • said gas barrier trays will be made by thermoforming a sheet of a surface layer of a heat-selable thermoplastic, an internal layer of a gas-barrier or low oxygen transmission material, as seen above, a bonding layer and a layer of thermoformable plastic, typically polystyrene, either unfoamed or foamed (indicated as EPS).
  • thermoformable plastic typically polystyrene, either unfoamed or foamed (indicated as EPS).
  • thermoformed trays can be made in-line or off-line.
  • pre-formed trays injection moulded trays can suitably be employed.
  • the preferred material in that case is still polystyrene, foamed or unfoamed, coated with a liner of a heat-sealable flexible film at least on the tray rims.
  • the coating of the injection moulded polystyrene tray will comprise a gas-barrier intermediate layer and will cover the whole tray surface.
  • Suitable dimensions of the trays will depend on the dimensions of the products to be packaged. Also the shape of the trays may vary in order to provide the packaged items with a better or more characterising appearance.
  • the dimensions of the tray rims is also not critical provided a sealing area of at least 2 mm, and preferably 3 mm is allowed to get a reliable seal.
  • a bi-axially oriented heat-shrinkable film characterized by a maximum shrink force, at the temperature which is attained in the area of the lid-sealing station, not higher than 0.04 kg/cm in at least the transversal direction will preferably be employed in the process according to the present invention.
  • a bi-axially oriented heat-shrinkable film characterized by a maximum shrink force, at the temperature which is attained in the area of the lid-sealing station, not higher than 0.03 kg/cm in at least the transversal direction might be even more preferably employed in the process according to the present invention.
  • thermoformed barrier trays about 225 mm in length, 170 mm in width, and 30 mm in depth (VITEMBAL) comprising an EPS substrate with an ethylene-vinyl alcohol copolymer as the barrier layer and a polyethylene heat-sealing layer (overall thickness of about 4 mm), are used on a MECAPLASTlC machine (MECA 2001).
  • MECAPLASTlC machine MECA 2001.
  • the trays are put on the infeed conveyor and filled with the products to be packaged.
  • the machine is a 2-lane one, able to seal 4 trays per cycle and running at a speed of 8 cycles per minute.
  • the trays are then carried into the lid sealing station.
  • the heat-shrinkable film A (whose structure and characteristics are reported below) proceeds from an upward tensioned unwind unit along a fed path within this lid sealing station over the four packages that are positioned width-wise.
  • the sealing mould is closed and vacuum is pulled up to the value set on the machine panel, then the suitable gas mixture is injected and the heated platen with the protruding knives descends to cut the heat-shrinkable lidstock about 3 mm far from the tray contours and hermetically heat seal the lidstock to the flat top lips of the trays.
  • the sealing temperature is set on the machine panel to a value of around 120°C.
  • the separated trays then exit the lid sealing station along the two lanes while the next carrier of four trays is then accomodated into the lid sealing station. Downstream packaging steps are carried out as known in the art.
  • Film A used in this packaging method is a five-ply cross-linked film of structure A/B/C/B/A wherein A is a blend of 25 % ethylene-vinyl acetate copolymer, 25% linear medium density polyethylene, and 50% linear low density polyethylene containing slip, antiblock, and antifog agents, C is a blend of ethylene-vinyl alcohol copolymer and a polyamide, and B is a tie layer comprising a modified linear low density polyethylene.
  • the film is prepared by following substantially the same procedure described in Example 1 of EP-B-217,596.
  • the film thus obtained is then submitted to a heat treatment by passing the tubular flattened film through a processing unit consisting of 6 stainless steel rollers heated to a temperature of from about 70°C to about 90°C and two rollers cooled to about room temperature, at a constant speed, for a total heating time of about 1.60 s.
  • the thus obtained film which has an overall thickness of 25 ⁇ , has a maximum transversal shrink force of 0.043 kg/cm.
  • the % free shrink at the sealing temperature is about 50 % in both directions.
  • the obtained barrier package has a tray lidding only 25 ⁇ thick (while the conventional laminate lidding are much thicker), the lid is perfectly tight on top of the tray with a very good control of possible ballooning effects, it is bright with very good optics (better than those obtainable with the conventional laminates also because of the reduced thickness), there is no distortion of the tray, and there are no floppy borders around the sealing area.
  • Analogous results can be obtained by using a Caveco Automa machine with Coopbox trays or a Caveco STL machine with injection moulded barrier polystyrene foam trays.
  • Injection moulded barrier trays about 190 mm in length, 130 mm in width, and 35 mm in depth comprising an EPS substrate with a liner of ethylene-vinyl alcohol copolymer as the barrier layer and a polyethylene heat-sealing layer (overall thickness about 7 mm), are used on a MECAPLASTIC machine (MECA 2001) suitably modified so as to provide for the cutting of the lidding film immediately after sealing.
  • MECAPLASTIC machine MECA 2001
  • the trays are put on the infeed conveyor and filled with the products to be packaged.
  • the machine is a 3-lane one, able to seal 3 trays per cycle and running at a speed of 10 cycles per minute.
  • the trays are then carried into the lid sealing station.
  • Film A is used and the process is run as in Example 1 with the only difference that first the heated platen descends to heat seal the lidstock to the flat top lips of the trays and immediately after a series of knives provides for the cutting of the heat-shrinkable lidstock about 3 mm far from the tray contours.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Packages (AREA)
  • Closing Of Containers (AREA)
EP19960102512 1995-03-01 1996-03-01 Procédé d'emballage Expired - Lifetime EP0729900B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19960102512 EP0729900B1 (fr) 1995-03-01 1996-03-01 Procédé d'emballage

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP95102885 1995-03-01
EP95102885 1995-03-01
EP19960102512 EP0729900B1 (fr) 1995-03-01 1996-03-01 Procédé d'emballage

Publications (3)

Publication Number Publication Date
EP0729900A2 true EP0729900A2 (fr) 1996-09-04
EP0729900A3 EP0729900A3 (fr) 1998-01-28
EP0729900B1 EP0729900B1 (fr) 2003-07-23

Family

ID=26138482

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960102512 Expired - Lifetime EP0729900B1 (fr) 1995-03-01 1996-03-01 Procédé d'emballage

Country Status (1)

Country Link
EP (1) EP0729900B1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000015431A1 (fr) * 1998-09-15 2000-03-23 Steen Pedersen Barquette d'emballage et ses procedes de fabrication et d'utilisation
US7803416B2 (en) 2005-02-18 2010-09-28 Cryovac, Inc. Packaging process for fresh meat products, fresh meat package obtainable thereby and twin lidding film suitable therefor
EP2805821A1 (fr) 2013-05-21 2014-11-26 Cryovac, Inc. Film thermorétrécissable à barrière contre les gaz
WO2017207662A1 (fr) 2016-06-01 2017-12-07 Cryovac, Inc. Film thermorétractable formant barrière contre les gaz
EP4056362A1 (fr) 2021-03-09 2022-09-14 Flexopack S.A. Film multicouche orienté monoaxialement

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1006466A (en) * 1963-05-13 1965-10-06 Monsanto Chemicals Improvements in or relating to packages comprising containers having coverings attached thereto
FR2058240A1 (fr) * 1969-08-13 1971-05-28 Sidaplax Nv
US3639318A (en) * 1968-05-29 1972-02-01 Union Carbide Corp Plasticized polyvinyl chloride film
EP0206826A2 (fr) * 1985-06-25 1986-12-30 Kureha Kagaku Kogyo Kabushiki Kaisha Pellicule laminée thermorétractable et son utilisation
GB2221649A (en) * 1988-08-11 1990-02-14 Okura Industrial Co Ltd Heat shrinkable composite film and packaging method using same
US4927677A (en) * 1987-04-28 1990-05-22 Nikka Co., Ltd. Composite materials and top materials for retort container

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54100896A (en) * 1978-01-21 1979-08-08 Miki Kagaku Kk Edge side heat seal packing vessel and laminated sheet

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1006466A (en) * 1963-05-13 1965-10-06 Monsanto Chemicals Improvements in or relating to packages comprising containers having coverings attached thereto
US3639318A (en) * 1968-05-29 1972-02-01 Union Carbide Corp Plasticized polyvinyl chloride film
FR2058240A1 (fr) * 1969-08-13 1971-05-28 Sidaplax Nv
EP0206826A2 (fr) * 1985-06-25 1986-12-30 Kureha Kagaku Kogyo Kabushiki Kaisha Pellicule laminée thermorétractable et son utilisation
US4927677A (en) * 1987-04-28 1990-05-22 Nikka Co., Ltd. Composite materials and top materials for retort container
GB2221649A (en) * 1988-08-11 1990-02-14 Okura Industrial Co Ltd Heat shrinkable composite film and packaging method using same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch, Week 7938 Derwent Publications Ltd., London, GB; Class A92, AN 79-68732B XP002048765 & JP 54 100 896 A ( MIKI KAGAKU KK) , 8 August 1979 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000015431A1 (fr) * 1998-09-15 2000-03-23 Steen Pedersen Barquette d'emballage et ses procedes de fabrication et d'utilisation
US6651874B1 (en) * 1998-09-15 2003-11-25 Steen Pedersen Packing tray and method for its production and use
US7803416B2 (en) 2005-02-18 2010-09-28 Cryovac, Inc. Packaging process for fresh meat products, fresh meat package obtainable thereby and twin lidding film suitable therefor
EP2377760A1 (fr) 2005-02-18 2011-10-19 Cryovac, Inc. Nouveau conditionnement de viande fraîche et film de recouvrement double adapté pour celui-ci
EP2805821A1 (fr) 2013-05-21 2014-11-26 Cryovac, Inc. Film thermorétrécissable à barrière contre les gaz
EP3069877A1 (fr) 2013-05-21 2016-09-21 Cryovac, Inc. Film thermoretrecissable a barriere contre les gaz
WO2017207662A1 (fr) 2016-06-01 2017-12-07 Cryovac, Inc. Film thermorétractable formant barrière contre les gaz
EP4056362A1 (fr) 2021-03-09 2022-09-14 Flexopack S.A. Film multicouche orienté monoaxialement

Also Published As

Publication number Publication date
EP0729900B1 (fr) 2003-07-23
EP0729900A3 (fr) 1998-01-28

Similar Documents

Publication Publication Date Title
CA2170692C (fr) Methode d'emballage utilisant un thermoplastique, l'emballage correspondant
CA2259904C (fr) Emballage scelle hermetiquement, et procede et machine de fabrication
EP1147048B1 (fr) Processus d'emballage en atmosphere modifiee de produits a forte epaisseur a l'aide d'une pellicule thermoretractable formee vers le haut
EP0003635B1 (fr) Film d'emballage auto-adhérent et procédé pour sa production
US4847148A (en) Thermoformable barrier sheet
US4935089A (en) Method of making a thermoformable barrier sheet
US5629060A (en) Packaging with peelable lid
US5419795A (en) High slip packaging film with trapped print
EP0595270B1 (fr) Feuille multicouche thermosoudable rétrécissable
JPH0326542A (ja) 架橋度の異なる多層フィルム
GB2099755A (en) Thermoplastic film having improved handling and sealing characteristics and receptacle formed therefrom
US4352702A (en) Method of making a thermoplastic receptacle having improved high temperature seal
US4183882A (en) Self-welding packaging film
EP0729900B1 (fr) Procédé d'emballage
EP4192682A1 (fr) Film de polyoléfine coextrudé multicouche et sa fabrication sur des lignes triple bulle
EP0214314B1 (fr) Matériau d'emballage laminé thermorétractable
USH1816H (en) Oriented, tubular film and heat-shrinkable, peelable bag for vacuum skin packaging
JPH0576423B2 (fr)
NZ243109A (en) Self-welding packaging film having layers of a self-welding ionomer, ethylene vinyl acetate copolymer, a copolymer of vinylidene chloride and vinyl chloride or methyl acrylate, and a blend of hdpe and ethylene vinyl acetate copolymer

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU NL PT SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: W.R. GRACE & CO.-CONN.

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU NL PT SE

17P Request for examination filed

Effective date: 19980519

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: CRYOVAC, INC.

17Q First examination report despatched

Effective date: 20000218

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU NL PT SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20030723

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20030723

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REF Corresponds to:

Ref document number: 69629142

Country of ref document: DE

Date of ref document: 20030828

Kind code of ref document: P

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20031023

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20031023

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20031023

REG Reference to a national code

Ref country code: CH

Ref legal event code: NV

Representative=s name: PFEIFFER VACUUM (SCHWEIZ) AG

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20031223

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040301

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2202388

Country of ref document: ES

Kind code of ref document: T3

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20040426

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IE

Payment date: 20100325

Year of fee payment: 15

Ref country code: ES

Payment date: 20100326

Year of fee payment: 15

Ref country code: CH

Payment date: 20100325

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20100406

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20100326

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20100324

Year of fee payment: 15

Ref country code: IT

Payment date: 20100330

Year of fee payment: 15

Ref country code: DE

Payment date: 20100329

Year of fee payment: 15

Ref country code: BE

Payment date: 20100324

Year of fee payment: 15

BERE Be: lapsed

Owner name: *CRYOVAC INC.

Effective date: 20110331

REG Reference to a national code

Ref country code: NL

Ref legal event code: V1

Effective date: 20111001

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20110301

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20111130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110331

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20111001

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110331

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110301

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20111001

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110331

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110331

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 69629142

Country of ref document: DE

Effective date: 20111001

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110301

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110301

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20120423

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110302