US20160122108A1 - Sealed fibrous container - Google Patents

Sealed fibrous container Download PDF

Info

Publication number
US20160122108A1
US20160122108A1 US14/877,232 US201514877232A US2016122108A1 US 20160122108 A1 US20160122108 A1 US 20160122108A1 US 201514877232 A US201514877232 A US 201514877232A US 2016122108 A1 US2016122108 A1 US 2016122108A1
Authority
US
United States
Prior art keywords
container
polymeric film
opening
film
certain embodiments
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
Application number
US14/877,232
Inventor
Ronan LYNCH
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.)
EVESHAM SPECIALIST PACKAGING Ltd
Original Assignee
EVESHAM SPECIALIST PACKAGING Ltd
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=51947042&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US20160122108(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by EVESHAM SPECIALIST PACKAGING Ltd filed Critical EVESHAM SPECIALIST PACKAGING Ltd
Assigned to EVESHAM SPECIALIST PACKAGING LIMITED reassignment EVESHAM SPECIALIST PACKAGING LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LYNCH, RONAN
Publication of US20160122108A1 publication Critical patent/US20160122108A1/en
Priority to US15/862,161 priority Critical patent/US20180222658A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D1/00Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/34Trays or like shallow containers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D77/00Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/10Container closures formed after filling
    • B65D77/20Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65BMACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10Applying or generating heat or pressure or combinations thereof
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D65/00Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38Packaging materials of special type or form
    • B65D65/46Applications of disintegrable, dissolvable or edible materials
    • B65D65/466Bio- or photodegradable packaging materials
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D77/00Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/10Container closures formed after filling
    • B65D77/20Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
    • B65D77/2024Container 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D77/00Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/22Details
    • B65D77/30Opening or contents-removing devices added or incorporated during filling or closing of containers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D85/00Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/30Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure
    • B65D85/34Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure for fruit, e.g. apples, oranges or tomatoes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D2565/00Wrappers or flexible covers; Packaging materials of special type or form
    • B65D2565/38Packaging materials of special type or form
    • B65D2565/381Details of packaging materials of special type or form
    • B65D2565/382Details of packaging materials of special type or form made of special paper
    • B65D2565/383Details of packaging materials of special type or form made of special paper made of recycled paper
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D2577/00Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks, bags
    • B65D2577/10Container closures formed after filling
    • B65D2577/20Container closures formed after filling by applying separate lids or covers
    • B65D2577/2041Pull tabs
    • B65D2577/205Pull tabs integral with the closure
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/80Packaging reuse or recycling, e.g. of multilayer packaging

Definitions

  • the present invention is directed to a container having an opening sealed with a polymeric film, the container being formed from a pulpable, fibrous material, and less than about 50% of the surface area of the polymeric film being is contact with the container, to a method of making such a container, and to a method of packaging an article of commerce (e.g., fruit) in said container.
  • an article of commerce e.g., fruit
  • Plastic and polystyrene are the dominant forms of packaging worldwide. They are attractive products owing to flexibility and/or low cost and ease of transport. In the fresh produce market, an important aspect is delivering to the consumer products that are fresh and safe. Plastics and polystyrene are commonly used for packaging fresh produce, such as fruit and vegetables. However, plastics are less attractive from an environmental perspective because they can be expensive to recycle, and consumers may in any case not bother to recycle and plastics tend to have poor or negligible biodegradability, whereas polystyrene cannot be recycled at all. Thus, there is growing demand for biodegradable and recyclable packaging.
  • Plastic packaging is easily sealable using polymeric films, largely owing to the compatibility of the polymeric materials used in the packaging and the film.
  • sealing non-plastic forms of packaging is an ongoing challenge.
  • FIG. 1A is a depiction of an exemplary sealed container in plan view.
  • FIG. 1B is a sectional view of the container of FIG. 1A through A-A.
  • a container having an opening sealed with a polymeric film, wherein the container is formed from a pulpable, fibrous material, and wherein less than about 50% of the surface area of the polymeric film is contact with the container.
  • a method of making a sealed container comprising placing a polymeric film over an opening of a container which is formed from a pulpable, fibrous material, and sealing the opening with the polymeric film by the application of heat and/or pressure to the polymer film and/or container, whereby less than about 50% of the surface area of the polymeric film is contact with the container.
  • a method of packaging an article of commerce in a container comprising placing an article of commerce in a container having an opening and which is formed from a pulpable, fibrous material, placing a polymeric film over the opening, and sealing the opening with the polymeric film by the application of heat and/or pressure to the polymer film and/or container.
  • FIGS. 1A and 1B References to the figures are made to illustrate the invention and are not intended to limit the embodiments described below to embodiments having precisely the features depicted in the figures.
  • the container has an opening which is sealed with the polymeric film, i.e., the polymer film bridges across the opening.
  • the container typically comprises a base and side walls about the base.
  • the side walls extend generally upwards from the base forming an interior housing within the container.
  • the periphery of the container may be rectangular, oblong, square, circular, ovular, or a squircle. Corners (e.g., between the base and sidewalls, or between adjacent sidewall sections), if present, may be angular or curved.
  • the side wall generally extends vertically from the base. In certain embodiments, an angle between the side wall and the base is at least 90°, for example, from about 90° to about 120°, or from about 90° to about 110°, or from about 90° to about 100°.
  • the polymer film has a thickness of from about 5 ⁇ m to about 3 mm, for example, from about 5 ⁇ m to about 2 mm, or from about 5 ⁇ m to about 1 mm, or from about 10 ⁇ m to about 500 ⁇ m, or from about 10 ⁇ m to about 250 ⁇ m, or form about 10 ⁇ m to about 150 ⁇ m, or from about 10 ⁇ m to about 100 ⁇ m, or from about 20 ⁇ m to about 100 ⁇ m, or from about 30 ⁇ m to about 100 ⁇ m, or from about 30 ⁇ m to about 80 ⁇ m.
  • the polymer film has a thickness of at least about 20 ⁇ m, or at least about 30 ⁇ m, or at least about 50 ⁇ m, or at least about 100 ⁇ m, or at least about 150 ⁇ m, or at least about 200 ⁇ m, or at least about 250 ⁇ m.
  • less than about 50% of the surface area of the polymeric film is in contact with the container.
  • less than about 25% of the surface area of the polymeric film is in contact with the container, for example, less than about 20%, or less than about 15%, or less than about 10%, or less than about 5%, or less than about 2.5% or, less than about 1% of the surface area of the polymeric film is in contact with the container.
  • at least about 0.1% of the surface are of the polymeric film is contact with the container, for example, at least about 0.5% of the surface area of the polymeric film is in contact with the container.
  • the container has a rim about the opening, and the seal is formed between the polymeric film and the rim.
  • the rim comprises a flange (4) extending outwards from, and about, the perimeter of the opening (6) of the container (2), and the seal (3) is formed between the polymeric film (8) and the flange (4).
  • the flange (4) extends outwards, for example, in a plane generally parallel to the base (12) of the container (2).
  • the flange (4) may extend outwards up to about 20 mm from the rim, for example, from about 1 mm to about 15 mm, or from about 2 mm to about 12 mm, or from about 2 mm to about 10 mm, or from about 2 mm to about 8 mm, or from about 2 mm to about 6 mm from the rim. In certain embodiments, flange (4) extends outwards up to about 1 mm, or about 2 mm, or about 3 mm, or about 4 mm, or about 5 mm, or about 6 mm, or about 7 mm, or about 8 mm, or about 9 mm, or about 10 mm from the rim. As shown in FIG. 1A , for example, the flange (4) may be formed about the entirety of the rim of the container (2) at the top of the side wall (14).
  • the seal formed between the polymeric film and the flange is the only point of contact between the polymeric film and the container.
  • the container does not comprise a flange and the seal is formed between an uppermost part of the exterior of the side wall and the polymeric film (e.g., an portion of the polymer film is “folded” over the outer periphery of the rim of the container).
  • the side wall may be of sufficient thickness (e.g., at least about 2 mm, or at least about 3 mm, or at least about 4 mm, or up to about 5 mm) such that a seal may be formed between the extent of the thickness of the side wall and the polymeric film.
  • the side wall may not be of uniform thickness, e.g., it may be thinner at the base than at its uppermost part.
  • the polymeric film extends beyond the flange, for example, by an amount sufficient for a user to grip and tear or peel back the polymeric film in order to access the contents of the container.
  • the polymer film comprises a tab portion (10), shown as in FIG. 1A .
  • the tab portion may sized and configured to enable a user to grip the tab and remove, for example, tear or peel back, the polymeric film from the container.
  • the tab portion when present, may be integral to the polymeric film.
  • the polymer film is formed of or comprises recycled polymer. In certain embodiments, the polymeric film is recyclable. In certain embodiments, the polymeric film is biodegradable. For the avoidance of doubt, the polymer film with which the container is sealed is not an outer wrapper. For the avoidance of doubt, the polymeric film following application is not coated to an interior surface (e.g., interior surface of the base and sidewall) of the container.
  • the polymeric film comprises polymer which softens or melts upon the application of heat and/or pressure, for example, heat and pressure, i.e., as the polymeric film is applied to the container.
  • heat and pressure for example, heat and pressure
  • the polymer softens or melts into and around fibres of the container, forming a bond between the polymeric film and the container.
  • At least a portion of the polymer film is formed of polymer which melts upon the application of heat and/or pressure, e.g., heat and pressure, as the polymeric film is applied to the container, e.g., to the rim or flange of the container.
  • Any thermoplastic polymeric material may be used provided it is capable of softening, preferably melting, upon application of heat and/or pressure as the polymer film is applied to the container.
  • the polymeric material has a melting point of from about 50° C. to about 250° C., for example, from about 50° C.
  • said at least a portion of the polymer film is a polyalkylene polymer, for example, a C 2 -C 5 polyalkylene polymer, such as polyethylene, or polypropylene, or polybutylene.
  • said at least a portion of the polymer film is polyethylene.
  • the polymer film comprises or is formed of polyethylene.
  • the polymer film comprises or is formed of HDPE (high density polyethylene having a density of from about 0.93-0.97 g/cm 3 , and a melting point of between about 100° C. and 140° C.), LDPE (low density polyethylene having a density of from about 0.91-0.93 g/cm 3 and a melting point between about 80° C. and 120° C.), or LLDPE (linear low density polyethylene having a density of from about 0.91-0.93 g/cm 3 and a melting point between about 120° C. to about 160° C.).
  • HDPE high density polyethylene having a density of from about 0.93-0.97 g/cm 3 , and a melting point of between about 100° C. and 140° C.
  • LDPE low density polyethylene having a density of from about 0.91-0.93 g/cm 3 and a melting point between about 80° C. and 120° C.
  • LLDPE linear low density polyethylene having a density of from about 0.91-0.93
  • the polymer film is a layered composite, for example, a polymer film comprising at least two layers of polymeric material.
  • the layered composite may comprise two layers, or three layers, or four layer, or five or more layers.
  • the layers may be formed of the same polymeric material or different polymeric materials.
  • the polymer film comprises a layer of polyalkylene polymer, for example, polyethylene (e.g., HPDE, or LDPE, or LLDPE).
  • the polymer film comprises a layer of polyethylene and a layer of another polymeric material, for example, polyester.
  • the layer of polyethylene faces the container during and following application (so that at least a portion of this layer may soften or melt upon application of heat and/or pressure), and the other layer faces outwards.
  • the polymer films is preferably transparent, although it may be opaque or translucent.
  • the polymer film is breathable (i.e., may allow the passage of oxygen and/or moisture vapour through the film).
  • the polymer film is perforated, i.e., comprises perforations. Perforations may used to modify, for example, enhance, the breathability of the film and, thus, the local environment within the container. Labelling may be fixed to the polymeric film, by physical means or by printing directly on to the film.
  • the sealed container may be free of adhesive, i.e., the seal between the polymeric film and the container is achieved without the need for adhesive.
  • the container e.g., a tray for fruit and the like, is formed from a pulpable, fibrous material.
  • the fibrous material may be derived from derived from wood, grasses (e.g., sugarcane, bamboo) or rags (e.g., textile waste, cotton, hemp or flax), preferably from wood.
  • the fibrous material is a cellulosic material.
  • the fibrous material is derived from recycled paper, for example, recycled paper board.
  • the recycled paper board is pre-consumer waste.
  • the recycled paper board is corrugator trim (which is a pre-consumer waste product).
  • the container may be formed from a pulp comprising the fibrous material, for example, a pulp comprising recycled paper board, such as a pulp comprising corrugator trim.
  • a pulp comprising recycled paper board such as a pulp comprising corrugator trim.
  • An advantage in using pre-consumer waste such as corrugator trim is that the waste does not require pre-processing to remove contaminants (e.g., ink, greases) normally associated with a post-consumer waste.
  • the pulp may comprise post-consumer waste which will have been treated as necessary to remove any contaminants that would otherwise adversely affect the quality (e.g., food safety) of the fresh produce that is to be packaged in the tray.
  • the container comprises at least about 80 wt. % fibrous material, based on the total weight of the container, for example, at least about 85 wt. % fibrous material, or at least about 90% fibrous material, or at least about 91% fibrous material, or at least about 92 wt. % fibrous material, or at least about 93 wt. % fibrous material, or at least about 94 wt. % fibrous material, or at least about 95 wt. % fibrous material, or at least about 96 wt. % fibrous material, or at least about 97 wt. fibrous material, or at least about 98 wt. % fibrous material.
  • the container may comprise from about 90-99.5 wt.
  • % fibrous material for example, from about 90-99 wt. % fibrous material, or from about 90-98 wt. %, or 90-97 wt. %, or 90-96 wt. %, or 90-95 wt. %, or 90-94 wt. %, or 90-93 wt. % fibrous material.
  • the container comprises an additive for varying the moisture and/or water resistance of the container.
  • the additive for varying the moisture and/or water resistance of the container is present in an amount (i) sufficient to prevent the container from absorbing moisture and/or water to the extent that the integrity of the container is compromised in use, and (ii) such that the container is able to absorb an amount of moisture and/or water to the extent that the flexibility of the container is increased.
  • the additive is not formed as a coating on fibrous material, but instead is dispersed within and throughout the fibrous material. This may achieved during the manufacturing process in which the additive is mixed with pulp prior to moulding.
  • the amount of additive for varying the moisture and/or water resistance of the container may range from about 0.1 wt.
  • % to about 20 wt. % based on the total weight of the tray, for example, from about 0.1 to about 15 wt. %, or from about 0.1 to about 10 wt. %, or from about 0.5 to about 8.0 wt. %, or from about 0.5 to about 6.0 wt. %, for from about 0.5 to about 5.0 wt. %, or from about 1.0 to about 4.5 wt. %, or from about 1.0 to about 4.0 wt. %, or from about 1.0 wt. % to about 3.5 wt. %, or from about 1.0 to about 3.0 wt. %, or from about 1.0 to about 2.5 wt.
  • % or from about 1.0 to about 2.0 wt. %, or from about 1.5 wt. % to about 4.5 wt. %, or from about 2.0 wt. % to about 4.0 wt. %, or from about 2.0 to about 3.5 wt. %, or from about 2.5 wt. % to about 3.5 wt. %, or from about 2.0 to about 3.0 wt. %.
  • Requirements (i) and (ii) mean that the container includes an amount of the additive such that the container is able to absorb a certain amount of moisture and/or vapour to increase the flexibility of the container (or conversely decrease the rigidity of the container), but prevented from absorbing too much moisture and/or water such that the container fails in use (e.g., it becomes too bendy or even disintegrates).
  • the level of additive should be selected such that the container does not fail following packaging, transportation, storage and display over a 5.5 day period, or a 6 day period, or a 6.5 day period, or 7 day period.
  • the longer the period between packaging and sale the greater the amount of additive that will be required to prevent the container from absorbing too moisture and/or water.
  • a skilled person will be able to determine the appropriate amount of additive by packaging a container, for example, with fresh produce, and then storing the packaged container at ambient conditions over a 5 day period (or a 5.5 day period, etc) and assessing the integrity of the container and the end of the period. Further details of this determination are found in GB-A-2507385, the entire contents of which are hereby incorporated by reference.
  • the additive for varying the moisture and/or water resistance of the container is wax, for example, natural wax or synthetic wax.
  • the wax is a natural wax selected from group consisting of paraffin wax, beeswax, rice bran wax, carnuba wax, candelilla wax, ouricury wax, sugarcane wax, retamo wax, lanolin and jojoba oil, and mixtures thereof.
  • the wax is a paraffin wax.
  • a paraffin wax is understood to refer to mixtures of mainly straight-chain, saturated hydrocarbons produced from petroleum, lignite or shale tar oil.
  • An exemplary paraffin wax is BIM SE 9244, available from BIM® Kemi Sweden AB.
  • the additive for varying the moisture and/or water resistance of the tray should comply with any regulatory requirements dealing with food packaging. These may vary depending on the territory in which the container is to be used and sold.
  • the additive for varying the moisture and/or water resistance of the tray preferably complies with FDA: 21 CFR 176.170 (2012); FDA: 21 CFR 176.180 (2012); and BfR XXXVI (2012) “Paper and board for food contact”.
  • the container comprises at least about 80 wt. % fibrous material and from about 0.1 to about 10 wt. % of the additive for varying the moisture and/or water resistance of the container, based on the total weight of the container, for example, at least about 90 wt. % fibrous material and from about 0.5 to about 5 wt. % of the additive for varying the moisture and/or water resistance of the container, or at least about 95 wt. % fibrous material and from 0.5 to about 5 wt. % of the additive for varying the moisture and/or water resistance of the container.
  • the container is coloured.
  • coloured is meant that the colour of the container is different to that of the natural colour of the fibrous material from which the container is formed.
  • the container comprises a colourant, for example, a dye or pigment, preferably a dye.
  • the colourant e.g., dye
  • the colourant may be added during preparation of the pulp from which the tray is to be moulded, as discussed below.
  • the colourant may be selected so to impart and desired colour to the container.
  • the colourant is a black colourant, blue colourant or a mixture of black and blue colourant, for example, a black dye, a blue dye or a mixture of black and blue dye.
  • An exemplary black dye is Cartasol Black M-G liquid, available from Clariant® Products, Switzerland.
  • An exemplary blue dye is Cartasol Blue K5R liquid, available from Clariant® Products, Switzerland.
  • the colourant should comply with any regulatory requirements pertaining to the use of colourants in food packaging. These may vary depending on the territory in which the container is to be used and sold. For example, the colourant preferably complies with Regulation (EC) No 1935/2004 of the European Parliament and of the Council of 27 Oct. 2004 on materials and articles intended to come into contact with food.
  • the container may comprise up to about 5% by weight colourant, based on the total weight of the container, for example, from about 0.1 to about 4.5 wt. % colourant, or from about 0.5 to about 4.0 wt. % colourant, or up to about 3.5 wt. % colourant, or up to about 3.0 wt. % colourant, or up to about 2.5 wt. % colourant, or up to about 2.0 wt. colourant, or up to about 2.0 wt. % colourant, or up to about 1.5 wt. % colourant, or up to about 1.0 wt. % colourant.
  • the container further comprises a biocide.
  • a biocide This may be added to protect fresh produce contained within the container, for example, to prevent or inhibit microbial spoilage, e.g., rotting, of fresh produce, and also to protect the manufacturing equipment for making the container.
  • the biocide may be a synthetic or natural biocide, preferably a synthetic biocide.
  • An exemplary natural biocide is chitosan.
  • the biocide may be an antimicrobial agent, for example, a germicide, antibacterial agent, antifungal agent, antiprotozoal agent, or a antiparasite agent.
  • Antimicrobial agents also include weak acids, organic acids (.e.g., lactic acid, citric acid, acetic acid, and their salts), bacteriocins, enzymes, and fungicides, among others.
  • the biocide is based on a quaternary ammonium compound.
  • these compounds comprise one or more polar quaternary amine head groups and a hydrophilic tail (e.g., a long alkyl chain).
  • a hydrophilic tail e.g., a long alkyl chain.
  • the length of the alkyl chain is generally between about 8 and 20 carbon atoms, for example, between about 8 and 16 carbon atoms.
  • An exemplary biocide of this type is Solcide SL 106 (Revision Nr: 0 of Aug. 15, 2011), available from Solstar®. It is based on a twin chain quaternary ammonium compound. This biocide may also comprise glutral.
  • the biocide may be based on a glutaraldehyde compound and/or a isothiozolone compound, for example, 5-chloro-2-methyl-2H-isothiazol-3-one and/or 2-methyl-2H-isothiazol-3-one.
  • An exemplary biocide is Solcide P 103 (Revision Nr: 0 of May 12, 2010), available from Solstar®.
  • Another exemplary biocide is Solcide P 112 (Revision Nr: 0 of Mar. 22, 2011), available from Solstar®.
  • the biocide may be based on an amide compound, for example, a propionamide, such as, for example, 2,2-di-bromo-3-nitrilo-propionamide.
  • a propionamide such as, for example, 2,2-di-bromo-3-nitrilo-propionamide.
  • An exemplary biocide is Solcide P 107 (Revision Nr: 0 of Apr. 10, 2010), available from Solstar®.
  • the biocide should comply with any regulatory requirements pertaining to the use of biocides in food packaging. These may vary depending on the territory in which the tray is to be used and sold.
  • the container comprises up to about 3 wt. % biocide, for example, up to about 2 wt. % biocide, or up to about 1 wt. % biocide, or up to about 0.9 wt. % biocide, or up to about 0.8 wt. % biocide, or up to about 0.7 wt. % biocide, or up to about 0.6 wt. % biocide, or up to about 0.5 wt. % biocide, or up to about 0.4 wt. biocide, or up to about 0.3 wt. % biocide, or up to about 0.2 wt. % biocide.
  • the container will comprise at least about 0.05 wt. % biocide, for example, at least about 0.1 wt. % biocide.
  • the biocide may be added during preparation of the pulp from which the container is to be moulded, as discussed below.
  • the container consists of fibrous substrate, the additive for varying the moisture and/or water resistance of the container, e.g., wax, and the polymeric film.
  • the fibrous material may constitute at least about 90 wt. %, or at least about 95 wt. % of the container, with the balance additive for varying the moisture and/or water resistance of the container, e.g., wax, and the polymeric film. Relative to the body of the container, the polymeric film will be understood to have negligible weight.
  • the container comprises:
  • the container is a tray for fresh produce and the like, as described in GB-A-2507385, the entire contents of which are hereby incorporated by reference.
  • the tray is suitable for packaging individual pieces of fresh produce, particularly fresh produce for the premium quality market.
  • Fresh produce includes fruit, vegetables and fungi, e.g., mushrooms.
  • the tray is suitable for packaging a wide range of fruits, such as, for example, apples and pears, grapes, citrus fruit, berries, melons, stone fruits, tomatoes, and exotic fruits.
  • Stone fruits include, apricots, avocados, cherries, dates, greengages, nectarines, peaches and plums, particular the soft skinned stoned fruits which are particularly sensitive to bruising and blemishing during packaging, transport and storage.
  • Citrus fruits include clementines, grapefruit, kumquats, lemons, limequat, minneolas, oranges, pomelo and satsumas.
  • Berries include strawberries, blueberries, blackberries, cranberries, gooseberries, raspberries, redcurrants, blackcurrants and white currants.
  • Melons include varieties such as cantelope, charantais, galia, honeydew, rock and water.
  • Exotic fruits include custard apple, figs, grenadillo, guava, kiwano (horned melon), kiwi, longuns, lychees, mangoes, mangosteen, passion fruit, paw paw, persimmon, physalis, pineapples (baby), pitahaya red, pitahaya yellow, pomegranates, prickly pear, quinces, rambutans, rhubarb, sharon fruit, star fruit, tamerillo and zespri golden.
  • Mushrooms include varieties such as button, cepes, chanterelles, chestnut brown, cup, enoki, flat, girolle, gold trumpet, mixed wild, morilles, mousseron, oyster, pas dedian, paston, pink oyster, Portobello, shitaki, trumpe de la mor and yellow oyster.
  • the tray is suitable for packaging a wide range of vegetables, such as root vegetables, potatoes, onions and shallots, capsicums, broccolis, chillies, beans, mange tout and peas, exotic vegetables and a selection of other general vegetables.
  • vegetables such as root vegetables, potatoes, onions and shallots, capsicums, broccolis, chillies, beans, mange tout and peas, exotic vegetables and a selection of other general vegetables.
  • Root vegetables include beetroot, carrots, celeriac, parsnips, swedes and turnips.
  • Onions and shallots include varieties such as button, cipolino, English, grelot, red, Spanish, strings, white skinned and banana.
  • Broccolis include sprouting broccoli, button sprouts, red, white and savoy cabbage, cauliflower, curly kale, purple broccoli and brussels sprouts.
  • the container has a structure as described in GB-A-2507385, for example, the embodiments described at page 11, line 16 to page 15, line 2 of GB-A-2507385.
  • the container is moulded, for example, a one-piece moulded container which may be biodegradable and/or recyclable.
  • the height of the container (i.e., the distance between, and perpendicular to both the base and the plane of the polymeric film) is at least about 20 mm, for example from about 20 to about 200 mm, or from about 25 to about 150 mm, or from about 30 to about 120 mm, or from about 30 to about 100 mm, or from about 30 to about 80 mm, or from about 20 to about 60 mm, or from about 20 to about 50 mm, or from about 25 to about 50 mm, or from about 30 to about 50 mm, or from about 35 to about 50 mm, or from about 25 to about 40 mm, or from about 25 to about 35 mm, or from about 30 to about 40 mm, or from about 35 to about 45 mm.
  • the length and width of the container may vary, independently, between about 50 mm and 500 mm.
  • a method for making the sealed container of the invention.
  • the method comprises placing a polymeric film over an opening of a container which is formed from a pulpable, fibrous material, and sealing the opening with the polymeric film by the application of heat and/or pressure to the polymer film and/or container, whereby less than about 50% of the surface area of the polymeric film is in contact with the container following application of the polymeric film. Typically, less than 5% of the surface area of the polymeric film is in contact with the container following application of the polymeric film.
  • At least a portion of the polymer film melts upon the application of heat and/or pressure, thereby bonding the polymer film to the fibres of the container.
  • a seal is formed between the flange and the polymer film by pressing them together between parallel, optionally heated plates, which are brought together about (e.g., from above and/or below) the flange and polymeric film.
  • the flange rests upon a bottom plate (which may or not be heated, preferably not heated) and an upper plate is brought against the upper side of the flange.
  • the upper plate is heated.
  • the upper or lower plate may additional comprise means for cutting the polymer film if it is provided as a continuous film.
  • heating is at a temperature of from about 50° C. to about 250° C., for example, of from about 50° C. and 200° C., or from about 50° C. to about 175° C., or from about 75° C. to about 175° C., or from about 100° C. to about 150° C.
  • the heating is advantageously at a temperature at which at least a portion of the polymeric film (e.g., polyethylene) melts, forming a bond between the polymeric film and fibres of the container.
  • the pressure applied (e.g., by an upper plate brought down against the upper side of the flange which is supported by a lower plate) is up to about 10 bar, for example, from about 2 bar to about 10 bar, or from about 3 bar to about 8 bar, or from about 4 bar to about 8 bar, or from about 5 bar to about 7 bar.
  • heat and pressure are applied from about 0.1 to about 5 seconds, for example, from about 0.2 to about 3.0 seconds, or from about 0.2 to about 2.0 seconds, or from about 0.2 to about 1.5 seconds, or from about 0.3 to about 1.2 seconds, or from about 0.4 to about 1.1 seconds.
  • the duration of application may be referred to as the residence or dwell time of the container in a container-sealing apparatus.
  • Suitable apparatus for sealing the container with the polymer film include those conventionally used for sealing plastic containers and include, without limitation, apparatus manufactured by Proseal® and Mondini®.
  • the method may be a continuous process in which a plurality of containers are sealed sequentially, or it may be a batch process.
  • the apparatus may be configured to enable automated manufacture of a plurality of sealed containers. Alternatively, the apparatus may be portable enabling individual containers to be sealed manually.
  • a method of packing an article of commerce in a sealed container comprising placing an article of commerce in a container having an opening and which is formed from a pulpable, fibrous material, as described above, placing a polymeric film over the opening, and sealing the opening with the polymeric film by the application of heat and/or pressure to the polymer film and/or container.
  • the sealing may be, and preferably is, conducted in accordance with the second aspect of the present invention.
  • the is fresh produce, e.g., any of the fresh produced described above.
  • any of the methods described herein a carried out in the absence of adhesive, i.e., an adhesive is not applied to the container or the polymeric film during manufacture and/or packaging.
  • the container is a one-piece moulded container and is prepared by a process comprising:
  • the fibrous substrate may be pulped in any suitable pulper. Such apparatus is well known to the those skilled in the art.
  • the pulp is obtained by pulping recycled paper or paper board, e.g., corrugators trim, to obtain a recycled paper pulp and optionally mixing in appropriate amounts of the additive for varying the moisture and/or water resistance of the container, colourant and biocide.
  • recycled paper or paper board e.g., corrugators trim
  • the fibrous material e.g., recycled paper or paper board
  • the solid content of the pulp is up to about 10 wt. %, based on the total weight of the solid.
  • An appropriate an amount of water relative to the amount of fibrous may be added in order to achieve the desired solids content.
  • the solids content in the pulper is less than about 8 wt. %, or less than about 6 wt. %, or less than about 5 wt. % or less than about 4 wt. %, or less than about 3 wt. %, or less than about 2 wt. %.
  • the solids content in the pulper is about 1-6 wt. %, for example, from about 2-5 wt. %, or from about 3-5 wt. %, or from about 3-4 wt. %, or from about 3.5-4.5 wt. %.
  • the additive for varying the moisture and/or water resistance of the container e.g., wax, and optional colourant and biocide are added during pulping in suitable amounts depending on the desired composition of the container.
  • the biocide when present, may be added in the water feed to the pulper, for example, added in the white water tank fluidly connected to the pulper.
  • the resultant pulp is forwarded to the moulding apparatus.
  • the solids content of the pulp may be reduced (i.e., by making down with additional water) as it passed to the moulding apparatus.
  • the solids content of the pulp is less than about 2 wt. % for moulding, for example, between about 1 and 2 wt. %, or from about 1.4 to about 1.8 wt. %, or from about 1.5 to about 1.7 wt. %.
  • the pulp is typically stored in a pulp tank.
  • the container is vacuum moulded from the pulp.
  • a wire mesh mould tailored to the shape of the container is submerged in a vat (or any other suitable means for storing the pulp) comprising the pulp.
  • the wire mesh mould would be regarded as a “male” tool with a cavity or cavities protruding upwards from a substantially flat base.
  • a vacuum is then applied from within the mould tool. The vacuum pulls the paper on to the mesh surface of the tool and perforations in the body of the tool allow the water to pass through, leaving the pulp behind formed into the desired shape of container.
  • the pulp is applied to the wire mesh mould by spraying, before the vacuum being applied as described above.
  • the moulded container is then transferred to a drying stage.
  • the container is removed from the mould by suction and then set down on a conveyor belt (with the back surface of the tray (which in use would be the base of the tray) facing upwards.
  • the setting down during transfer includes the use of air, known as transfer air, to blow the tray from the transfer on the conveyor belt.
  • transfer air air
  • the air flow is reduced or controlled to cause the tray to settle gently on the conveyor belt so to control the extent of the flange.
  • the greater the force with which the tray meets the conveyor belt the greater the flange portion that forms because the outer rim of the container tends to be pushed out upon contact with the surface of the conveyor belt.
  • drying may be performed by any suitable drying means, for example, a drying oven.
  • drying is performed using super-heated steam, e.g., using a Merrill Airdyne dryer. This advantageously reduces the drying time, for example, to 15 mins or less per container, for example, 12 mins or less, or about 10 mins.
  • the container whilst attached to the mould is subjected to a wet press, typically applied to the back surface of the container using a “female” mould complimentary in form to the “male” moulding tool.
  • a wet press typically applied to the back surface of the container using a “female” mould complimentary in form to the “male” moulding tool.
  • the container is manufactured at a first location, and then transported to a second location for packaging, e.g., with fresh produce, followed by application of the polymeric film.

Abstract

A container having an opening sealed with a polymeric film, the container being formed from a pulpable, fibrous material, and less than about 50% of the surface area of the polymeric film being is contact with the container, a method of making such a container, and a method of packaging an article of commerce (e.g., fruit) in said container.

Description

    TECHNICAL FIELD
  • The present invention is directed to a container having an opening sealed with a polymeric film, the container being formed from a pulpable, fibrous material, and less than about 50% of the surface area of the polymeric film being is contact with the container, to a method of making such a container, and to a method of packaging an article of commerce (e.g., fruit) in said container.
  • BACKGROUND OF THE INVENTION
  • Plastic and polystyrene are the dominant forms of packaging worldwide. They are attractive products owing to flexibility and/or low cost and ease of transport. In the fresh produce market, an important aspect is delivering to the consumer products that are fresh and safe. Plastics and polystyrene are commonly used for packaging fresh produce, such as fruit and vegetables. However, plastics are less attractive from an environmental perspective because they can be expensive to recycle, and consumers may in any case not bother to recycle and plastics tend to have poor or negligible biodegradability, whereas polystyrene cannot be recycled at all. Thus, there is growing demand for biodegradable and recyclable packaging.
  • Plastic packaging is easily sealable using polymeric films, largely owing to the compatibility of the polymeric materials used in the packaging and the film. However, sealing non-plastic forms of packaging is an ongoing challenge.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1A is a depiction of an exemplary sealed container in plan view.
  • FIG. 1B is a sectional view of the container of FIG. 1A through A-A.
  • SUMMARY OF THE INVENTION
  • According to a first aspect, there is provided a container having an opening sealed with a polymeric film, wherein the container is formed from a pulpable, fibrous material, and wherein less than about 50% of the surface area of the polymeric film is contact with the container.
  • According to a second aspect, there is provided a method of making a sealed container, said method comprising placing a polymeric film over an opening of a container which is formed from a pulpable, fibrous material, and sealing the opening with the polymeric film by the application of heat and/or pressure to the polymer film and/or container, whereby less than about 50% of the surface area of the polymeric film is contact with the container.
  • According to a third aspect, there is provided a method of packaging an article of commerce in a container, said method comprising placing an article of commerce in a container having an opening and which is formed from a pulpable, fibrous material, placing a polymeric film over the opening, and sealing the opening with the polymeric film by the application of heat and/or pressure to the polymer film and/or container.
  • DETAILED DESCRIPTION OF THE INVENTION
  • In the following discussion, reference is made to the illustrated embodiments depicted in FIGS. 1A and 1B. References to the figures are made to illustrate the invention and are not intended to limit the embodiments described below to embodiments having precisely the features depicted in the figures.
  • The container has an opening which is sealed with the polymeric film, i.e., the polymer film bridges across the opening. The container typically comprises a base and side walls about the base. The side walls extend generally upwards from the base forming an interior housing within the container. In plan view, the periphery of the container may be rectangular, oblong, square, circular, ovular, or a squircle. Corners (e.g., between the base and sidewalls, or between adjacent sidewall sections), if present, may be angular or curved. The side wall generally extends vertically from the base. In certain embodiments, an angle between the side wall and the base is at least 90°, for example, from about 90° to about 120°, or from about 90° to about 110°, or from about 90° to about 100°.
  • In certain embodiments, the polymer film has a thickness of from about 5 μm to about 3 mm, for example, from about 5 μm to about 2 mm, or from about 5 μm to about 1 mm, or from about 10 μm to about 500 μm, or from about 10 μm to about 250 μm, or form about 10 μm to about 150 μm, or from about 10 μm to about 100 μm, or from about 20 μm to about 100 μm, or from about 30 μm to about 100 μm, or from about 30 μm to about 80 μm. In certain embodiments, the polymer film has a thickness of at least about 20 μm, or at least about 30 μm, or at least about 50 μm, or at least about 100 μm, or at least about 150 μm, or at least about 200 μm, or at least about 250 μm.
  • Following application, less than about 50% of the surface area of the polymeric film is in contact with the container. In certain embodiments, less than about 25% of the surface area of the polymeric film is in contact with the container, for example, less than about 20%, or less than about 15%, or less than about 10%, or less than about 5%, or less than about 2.5% or, less than about 1% of the surface area of the polymeric film is in contact with the container. In certain embodiments, at least about 0.1% of the surface are of the polymeric film is contact with the container, for example, at least about 0.5% of the surface area of the polymeric film is in contact with the container.
  • In certain embodiments, the container has a rim about the opening, and the seal is formed between the polymeric film and the rim. In certain embodiments, and with reference to FIGS. 1A and 1B, the rim comprises a flange (4) extending outwards from, and about, the perimeter of the opening (6) of the container (2), and the seal (3) is formed between the polymeric film (8) and the flange (4). The flange (4) extends outwards, for example, in a plane generally parallel to the base (12) of the container (2). The flange (4) may extend outwards up to about 20 mm from the rim, for example, from about 1 mm to about 15 mm, or from about 2 mm to about 12 mm, or from about 2 mm to about 10 mm, or from about 2 mm to about 8 mm, or from about 2 mm to about 6 mm from the rim. In certain embodiments, flange (4) extends outwards up to about 1 mm, or about 2 mm, or about 3 mm, or about 4 mm, or about 5 mm, or about 6 mm, or about 7 mm, or about 8 mm, or about 9 mm, or about 10 mm from the rim. As shown in FIG. 1A, for example, the flange (4) may be formed about the entirety of the rim of the container (2) at the top of the side wall (14).
  • In certain embodiments, the seal formed between the polymeric film and the flange is the only point of contact between the polymeric film and the container.
  • In certain embodiments, the container does not comprise a flange and the seal is formed between an uppermost part of the exterior of the side wall and the polymeric film (e.g., an portion of the polymer film is “folded” over the outer periphery of the rim of the container). In certain embodiments, the side wall may be of sufficient thickness (e.g., at least about 2 mm, or at least about 3 mm, or at least about 4 mm, or up to about 5 mm) such that a seal may be formed between the extent of the thickness of the side wall and the polymeric film. In such embodiments, the side wall may not be of uniform thickness, e.g., it may be thinner at the base than at its uppermost part.
  • In certain embodiments, the polymeric film extends beyond the flange, for example, by an amount sufficient for a user to grip and tear or peel back the polymeric film in order to access the contents of the container. In certain embodiments, the polymer film comprises a tab portion (10), shown as in FIG. 1A. The tab portion may sized and configured to enable a user to grip the tab and remove, for example, tear or peel back, the polymeric film from the container. The tab portion, when present, may be integral to the polymeric film.
  • In certain embodiments, the polymer film is formed of or comprises recycled polymer. In certain embodiments, the polymeric film is recyclable. In certain embodiments, the polymeric film is biodegradable. For the avoidance of doubt, the polymer film with which the container is sealed is not an outer wrapper. For the avoidance of doubt, the polymeric film following application is not coated to an interior surface (e.g., interior surface of the base and sidewall) of the container.
  • In certain embodiments, the polymeric film comprises polymer which softens or melts upon the application of heat and/or pressure, for example, heat and pressure, i.e., as the polymeric film is applied to the container. Without wishing to be bound by theory, it is believed that the polymer softens or melts into and around fibres of the container, forming a bond between the polymeric film and the container. In certain embodiments, at least a portion of the polymer film, e.g., at least a portion which is in contact with the container upon application of the polymeric film to the container, is formed of polymer which melts upon the application of heat and/or pressure, e.g., heat and pressure, as the polymeric film is applied to the container, e.g., to the rim or flange of the container. Any thermoplastic polymeric material may be used provided it is capable of softening, preferably melting, upon application of heat and/or pressure as the polymer film is applied to the container. In certain embodiments the polymeric material has a melting point of from about 50° C. to about 250° C., for example, from about 50° C. to about 200° C., or from about 50° C. to about 150° C., or from about 75° C. to about 175° C., or from about 100° C. to about 175° C., or from about 100° C. to about 150° C. In certain embodiments, said at least a portion of the polymer film is a polyalkylene polymer, for example, a C2-C5 polyalkylene polymer, such as polyethylene, or polypropylene, or polybutylene. In certain embodiments, said at least a portion of the polymer film is polyethylene. In certain embodiments, the polymer film comprises or is formed of polyethylene. In certain embodiments, the polymer film comprises or is formed of HDPE (high density polyethylene having a density of from about 0.93-0.97 g/cm3, and a melting point of between about 100° C. and 140° C.), LDPE (low density polyethylene having a density of from about 0.91-0.93 g/cm3 and a melting point between about 80° C. and 120° C.), or LLDPE (linear low density polyethylene having a density of from about 0.91-0.93 g/cm3 and a melting point between about 120° C. to about 160° C.).
  • In certain embodiments, the polymer film is a layered composite, for example, a polymer film comprising at least two layers of polymeric material. The layered composite may comprise two layers, or three layers, or four layer, or five or more layers. The layers may be formed of the same polymeric material or different polymeric materials. In certain embodiments, the polymer film comprises a layer of polyalkylene polymer, for example, polyethylene (e.g., HPDE, or LDPE, or LLDPE). In certain embodiments the polymer film comprises a layer of polyethylene and a layer of another polymeric material, for example, polyester. In such embodiments, the layer of polyethylene faces the container during and following application (so that at least a portion of this layer may soften or melt upon application of heat and/or pressure), and the other layer faces outwards.
  • The polymer films is preferably transparent, although it may be opaque or translucent.
  • In certain embodiments, the polymer film is breathable (i.e., may allow the passage of oxygen and/or moisture vapour through the film). In certain embodiments, the polymer film is perforated, i.e., comprises perforations. Perforations may used to modify, for example, enhance, the breathability of the film and, thus, the local environment within the container. Labelling may be fixed to the polymeric film, by physical means or by printing directly on to the film.
  • Advantageously, the sealed container may be free of adhesive, i.e., the seal between the polymeric film and the container is achieved without the need for adhesive.
  • The container, e.g., a tray for fruit and the like, is formed from a pulpable, fibrous material. The fibrous material may be derived from derived from wood, grasses (e.g., sugarcane, bamboo) or rags (e.g., textile waste, cotton, hemp or flax), preferably from wood. In certain embodiments, the fibrous material is a cellulosic material. In certain embodiments, the fibrous material is derived from recycled paper, for example, recycled paper board. In certain embodiments, the recycled paper board is pre-consumer waste. In certain embodiments, the recycled paper board is corrugator trim (which is a pre-consumer waste product). As discussed below, the container may be formed from a pulp comprising the fibrous material, for example, a pulp comprising recycled paper board, such as a pulp comprising corrugator trim. An advantage in using pre-consumer waste such as corrugator trim is that the waste does not require pre-processing to remove contaminants (e.g., ink, greases) normally associated with a post-consumer waste. However, in certain embodiments, the pulp may comprise post-consumer waste which will have been treated as necessary to remove any contaminants that would otherwise adversely affect the quality (e.g., food safety) of the fresh produce that is to be packaged in the tray.
  • Typically, the container comprises at least about 80 wt. % fibrous material, based on the total weight of the container, for example, at least about 85 wt. % fibrous material, or at least about 90% fibrous material, or at least about 91% fibrous material, or at least about 92 wt. % fibrous material, or at least about 93 wt. % fibrous material, or at least about 94 wt. % fibrous material, or at least about 95 wt. % fibrous material, or at least about 96 wt. % fibrous material, or at least about 97 wt. fibrous material, or at least about 98 wt. % fibrous material. The container may comprise from about 90-99.5 wt. % fibrous material, for example, from about 90-99 wt. % fibrous material, or from about 90-98 wt. %, or 90-97 wt. %, or 90-96 wt. %, or 90-95 wt. %, or 90-94 wt. %, or 90-93 wt. % fibrous material.
  • In certain embodiments, the container comprises an additive for varying the moisture and/or water resistance of the container. The additive for varying the moisture and/or water resistance of the container is present in an amount (i) sufficient to prevent the container from absorbing moisture and/or water to the extent that the integrity of the container is compromised in use, and (ii) such that the container is able to absorb an amount of moisture and/or water to the extent that the flexibility of the container is increased. The additive is not formed as a coating on fibrous material, but instead is dispersed within and throughout the fibrous material. This may achieved during the manufacturing process in which the additive is mixed with pulp prior to moulding. Generally, the amount of additive for varying the moisture and/or water resistance of the container may range from about 0.1 wt. % to about 20 wt. %, based on the total weight of the tray, for example, from about 0.1 to about 15 wt. %, or from about 0.1 to about 10 wt. %, or from about 0.5 to about 8.0 wt. %, or from about 0.5 to about 6.0 wt. %, for from about 0.5 to about 5.0 wt. %, or from about 1.0 to about 4.5 wt. %, or from about 1.0 to about 4.0 wt. %, or from about 1.0 wt. % to about 3.5 wt. %, or from about 1.0 to about 3.0 wt. %, or from about 1.0 to about 2.5 wt. %, or from about 1.0 to about 2.0 wt. %, or from about 1.5 wt. % to about 4.5 wt. %, or from about 2.0 wt. % to about 4.0 wt. %, or from about 2.0 to about 3.5 wt. %, or from about 2.5 wt. % to about 3.5 wt. %, or from about 2.0 to about 3.0 wt. %.
  • Requirements (i) and (ii) mean that the container includes an amount of the additive such that the container is able to absorb a certain amount of moisture and/or vapour to increase the flexibility of the container (or conversely decrease the rigidity of the container), but prevented from absorbing too much moisture and/or water such that the container fails in use (e.g., it becomes too bendy or even disintegrates).
  • In certain embodiments, the level of additive should be selected such that the container does not fail following packaging, transportation, storage and display over a 5.5 day period, or a 6 day period, or a 6.5 day period, or 7 day period. Generally, the longer the period between packaging and sale, the greater the amount of additive that will be required to prevent the container from absorbing too moisture and/or water. A skilled person will be able to determine the appropriate amount of additive by packaging a container, for example, with fresh produce, and then storing the packaged container at ambient conditions over a 5 day period (or a 5.5 day period, etc) and assessing the integrity of the container and the end of the period. Further details of this determination are found in GB-A-2507385, the entire contents of which are hereby incorporated by reference.
  • In certain embodiments, the additive for varying the moisture and/or water resistance of the container is wax, for example, natural wax or synthetic wax. In certain embodiments, the wax is a natural wax selected from group consisting of paraffin wax, beeswax, rice bran wax, carnuba wax, candelilla wax, ouricury wax, sugarcane wax, retamo wax, lanolin and jojoba oil, and mixtures thereof. Advantageously, the wax is a paraffin wax. A paraffin wax is understood to refer to mixtures of mainly straight-chain, saturated hydrocarbons produced from petroleum, lignite or shale tar oil. An exemplary paraffin wax is BIM SE 9244, available from BIM® Kemi Sweden AB.
  • Like all of the components of the container of the invention, the additive for varying the moisture and/or water resistance of the tray should comply with any regulatory requirements dealing with food packaging. These may vary depending on the territory in which the container is to be used and sold. For example, the additive for varying the moisture and/or water resistance of the tray preferably complies with FDA: 21 CFR 176.170 (2012); FDA: 21 CFR 176.180 (2012); and BfR XXXVI (2012) “Paper and board for food contact”.
  • In certain embodiments, the container comprises at least about 80 wt. % fibrous material and from about 0.1 to about 10 wt. % of the additive for varying the moisture and/or water resistance of the container, based on the total weight of the container, for example, at least about 90 wt. % fibrous material and from about 0.5 to about 5 wt. % of the additive for varying the moisture and/or water resistance of the container, or at least about 95 wt. % fibrous material and from 0.5 to about 5 wt. % of the additive for varying the moisture and/or water resistance of the container.
  • In certain embodiments, the container is coloured. By coloured is meant that the colour of the container is different to that of the natural colour of the fibrous material from which the container is formed. Thus, in certain embodiments, the container comprises a colourant, for example, a dye or pigment, preferably a dye. The colourant, e.g., dye, may be added during preparation of the pulp from which the tray is to be moulded, as discussed below. The colourant may be selected so to impart and desired colour to the container. In certain embodiments, the colourant is a black colourant, blue colourant or a mixture of black and blue colourant, for example, a black dye, a blue dye or a mixture of black and blue dye. An exemplary black dye is Cartasol Black M-G liquid, available from Clariant® Products, Switzerland. An exemplary blue dye is Cartasol Blue K5R liquid, available from Clariant® Products, Switzerland.
  • The colourant should comply with any regulatory requirements pertaining to the use of colourants in food packaging. These may vary depending on the territory in which the container is to be used and sold. For example, the colourant preferably complies with Regulation (EC) No 1935/2004 of the European Parliament and of the Council of 27 Oct. 2004 on materials and articles intended to come into contact with food. The container may comprise up to about 5% by weight colourant, based on the total weight of the container, for example, from about 0.1 to about 4.5 wt. % colourant, or from about 0.5 to about 4.0 wt. % colourant, or up to about 3.5 wt. % colourant, or up to about 3.0 wt. % colourant, or up to about 2.5 wt. % colourant, or up to about 2.0 wt. colourant, or up to about 2.0 wt. % colourant, or up to about 1.5 wt. % colourant, or up to about 1.0 wt. % colourant.
  • In certain embodiments, the container further comprises a biocide. This may be added to protect fresh produce contained within the container, for example, to prevent or inhibit microbial spoilage, e.g., rotting, of fresh produce, and also to protect the manufacturing equipment for making the container. The biocide may be a synthetic or natural biocide, preferably a synthetic biocide. An exemplary natural biocide is chitosan. The biocide may be an antimicrobial agent, for example, a germicide, antibacterial agent, antifungal agent, antiprotozoal agent, or a antiparasite agent. Antimicrobial agents also include weak acids, organic acids (.e.g., lactic acid, citric acid, acetic acid, and their salts), bacteriocins, enzymes, and fungicides, among others.
  • In certain embodiments, the biocide is based on a quaternary ammonium compound. Typically, these compounds comprise one or more polar quaternary amine head groups and a hydrophilic tail (e.g., a long alkyl chain). Although there can be many variations in the minutiae of their structures, the length of the alkyl chain is generally between about 8 and 20 carbon atoms, for example, between about 8 and 16 carbon atoms. An exemplary biocide of this type is Solcide SL 106 (Revision Nr: 0 of Aug. 15, 2011), available from Solstar®. It is based on a twin chain quaternary ammonium compound. This biocide may also comprise glutral.
  • In certain embodiments, the biocide may be based on a glutaraldehyde compound and/or a isothiozolone compound, for example, 5-chloro-2-methyl-2H-isothiazol-3-one and/or 2-methyl-2H-isothiazol-3-one. An exemplary biocide is Solcide P 103 (Revision Nr: 0 of May 12, 2010), available from Solstar®. Another exemplary biocide is Solcide P 112 (Revision Nr: 0 of Mar. 22, 2011), available from Solstar®.
  • In certain embodiments, the biocide may be based on an amide compound, for example, a propionamide, such as, for example, 2,2-di-bromo-3-nitrilo-propionamide. An exemplary biocide is Solcide P 107 (Revision Nr: 0 of Apr. 10, 2010), available from Solstar®.
  • The biocide should comply with any regulatory requirements pertaining to the use of biocides in food packaging. These may vary depending on the territory in which the tray is to be used and sold.
  • In certain embodiments, the container comprises up to about 3 wt. % biocide, for example, up to about 2 wt. % biocide, or up to about 1 wt. % biocide, or up to about 0.9 wt. % biocide, or up to about 0.8 wt. % biocide, or up to about 0.7 wt. % biocide, or up to about 0.6 wt. % biocide, or up to about 0.5 wt. % biocide, or up to about 0.4 wt. biocide, or up to about 0.3 wt. % biocide, or up to about 0.2 wt. % biocide. Typically, when present, the container will comprise at least about 0.05 wt. % biocide, for example, at least about 0.1 wt. % biocide.
  • The biocide may be added during preparation of the pulp from which the container is to be moulded, as discussed below.
  • In certain embodiments, the container consists of fibrous substrate, the additive for varying the moisture and/or water resistance of the container, e.g., wax, and the polymeric film. In such embodiments, the fibrous material may constitute at least about 90 wt. %, or at least about 95 wt. % of the container, with the balance additive for varying the moisture and/or water resistance of the container, e.g., wax, and the polymeric film. Relative to the body of the container, the polymeric film will be understood to have negligible weight.
  • In certain embodiments, the container comprises:
      • (i) from about 90-98 wt. % fibrous material;
      • (ii) from 0.1 to about 5 wt. % additive, e.g., wax;
      • (iii) up to about 4.0 wt. % colourant, or from about 0 to 4 wt. % colorant; and
      • (iv) up to about 2.0 wt. % biocide, or from about 0 to 2.0 wt. biocide, for example, up to about 1.0 wt. % biocide.
  • In certain embodiments, the container is a tray for fresh produce and the like, as described in GB-A-2507385, the entire contents of which are hereby incorporated by reference.
  • In certain embodiments, the tray is suitable for packaging individual pieces of fresh produce, particularly fresh produce for the premium quality market. Fresh produce includes fruit, vegetables and fungi, e.g., mushrooms.
  • In certain embodiments, the tray is suitable for packaging a wide range of fruits, such as, for example, apples and pears, grapes, citrus fruit, berries, melons, stone fruits, tomatoes, and exotic fruits.
  • Stone fruits include, apricots, avocados, cherries, dates, greengages, nectarines, peaches and plums, particular the soft skinned stoned fruits which are particularly sensitive to bruising and blemishing during packaging, transport and storage.
  • Citrus fruits include clementines, grapefruit, kumquats, lemons, limequat, minneolas, oranges, pomelo and satsumas.
  • Berries include strawberries, blueberries, blackberries, cranberries, gooseberries, raspberries, redcurrants, blackcurrants and white currants.
  • Melons include varieties such as cantelope, charantais, galia, honeydew, rock and water.
  • Exotic fruits include custard apple, figs, grenadillo, guava, kiwano (horned melon), kiwi, longuns, lychees, mangoes, mangosteen, passion fruit, paw paw, persimmon, physalis, pineapples (baby), pitahaya red, pitahaya yellow, pomegranates, prickly pear, quinces, rambutans, rhubarb, sharon fruit, star fruit, tamerillo and zespri golden.
  • Mushrooms include varieties such as button, cepes, chanterelles, chestnut brown, cup, enoki, flat, girolle, gold trumpet, mixed wild, morilles, mousseron, oyster, pied de bleu, pied de mouton, pink oyster, Portobello, shitaki, trumpe de la mor and yellow oyster.
  • In certain embodiments, the tray is suitable for packaging a wide range of vegetables, such as root vegetables, potatoes, onions and shallots, capsicums, broccolis, chillies, beans, mange tout and peas, exotic vegetables and a selection of other general vegetables.
  • Root vegetables include beetroot, carrots, celeriac, parsnips, swedes and turnips. Onions and shallots include varieties such as button, cipolino, English, grelot, red, Spanish, strings, white skinned and banana.
  • Broccolis include sprouting broccoli, button sprouts, red, white and savoy cabbage, cauliflower, curly kale, purple broccoli and brussels sprouts.
  • Other general vegetables include aubergines, chicory, fennel, leeks, marrows, round courgettes and butternut squash.#
  • In certain embodiments, the container has a structure as described in GB-A-2507385, for example, the embodiments described at page 11, line 16 to page 15, line 2 of GB-A-2507385.
  • Advantageously, the container is moulded, for example, a one-piece moulded container which may be biodegradable and/or recyclable.
  • In certain embodiments, the height of the container (i.e., the distance between, and perpendicular to both the base and the plane of the polymeric film) is at least about 20 mm, for example from about 20 to about 200 mm, or from about 25 to about 150 mm, or from about 30 to about 120 mm, or from about 30 to about 100 mm, or from about 30 to about 80 mm, or from about 20 to about 60 mm, or from about 20 to about 50 mm, or from about 25 to about 50 mm, or from about 30 to about 50 mm, or from about 35 to about 50 mm, or from about 25 to about 40 mm, or from about 25 to about 35 mm, or from about 30 to about 40 mm, or from about 35 to about 45 mm. The length and width of the container may vary, independently, between about 50 mm and 500 mm.
  • In accordance with a second aspect of the invention, a method is provided for making the sealed container of the invention. The method comprises placing a polymeric film over an opening of a container which is formed from a pulpable, fibrous material, and sealing the opening with the polymeric film by the application of heat and/or pressure to the polymer film and/or container, whereby less than about 50% of the surface area of the polymeric film is in contact with the container following application of the polymeric film. Typically, less than 5% of the surface area of the polymeric film is in contact with the container following application of the polymeric film.
  • In certain embodiments, at least a portion of the polymer film melts upon the application of heat and/or pressure, thereby bonding the polymer film to the fibres of the container.
  • In certain embodiments, for example, embodiments in which the container comprises a flange, a seal is formed between the flange and the polymer film by pressing them together between parallel, optionally heated plates, which are brought together about (e.g., from above and/or below) the flange and polymeric film. In certain embodiments, the flange rests upon a bottom plate (which may or not be heated, preferably not heated) and an upper plate is brought against the upper side of the flange. In certain embodiments, the upper plate is heated. The upper or lower plate may additional comprise means for cutting the polymer film if it is provided as a continuous film.
  • In certain embodiments, heating is at a temperature of from about 50° C. to about 250° C., for example, of from about 50° C. and 200° C., or from about 50° C. to about 175° C., or from about 75° C. to about 175° C., or from about 100° C. to about 150° C. As discussed above, the heating is advantageously at a temperature at which at least a portion of the polymeric film (e.g., polyethylene) melts, forming a bond between the polymeric film and fibres of the container.
  • In certain embodiments, the pressure applied (e.g., by an upper plate brought down against the upper side of the flange which is supported by a lower plate) is up to about 10 bar, for example, from about 2 bar to about 10 bar, or from about 3 bar to about 8 bar, or from about 4 bar to about 8 bar, or from about 5 bar to about 7 bar.
  • In certain embodiments, heat and pressure are applied from about 0.1 to about 5 seconds, for example, from about 0.2 to about 3.0 seconds, or from about 0.2 to about 2.0 seconds, or from about 0.2 to about 1.5 seconds, or from about 0.3 to about 1.2 seconds, or from about 0.4 to about 1.1 seconds. The duration of application may be referred to as the residence or dwell time of the container in a container-sealing apparatus.
  • Suitable apparatus for sealing the container with the polymer film include those conventionally used for sealing plastic containers and include, without limitation, apparatus manufactured by Proseal® and Mondini®.
  • The method may be a continuous process in which a plurality of containers are sealed sequentially, or it may be a batch process. The apparatus may be configured to enable automated manufacture of a plurality of sealed containers. Alternatively, the apparatus may be portable enabling individual containers to be sealed manually.
  • According to the third aspect, there is provided a method of packing an article of commerce in a sealed container, said method comprising placing an article of commerce in a container having an opening and which is formed from a pulpable, fibrous material, as described above, placing a polymeric film over the opening, and sealing the opening with the polymeric film by the application of heat and/or pressure to the polymer film and/or container. The sealing may be, and preferably is, conducted in accordance with the second aspect of the present invention.
  • In certain embodiments, the is fresh produce, e.g., any of the fresh produced described above.
  • Advantageously, any of the methods described herein a carried out in the absence of adhesive, i.e., an adhesive is not applied to the container or the polymeric film during manufacture and/or packaging.
  • In certain embodiments, the container is a one-piece moulded container and is prepared by a process comprising:
  • i) preparing, providing or obtaining a pulp comprising suitable amounts of fibrous material, and optionally additive for varying the moisture and/or water resistance and optional biocide; and
    ii) moulding a one-piece container therefrom.
  • The fibrous substrate may be pulped in any suitable pulper. Such apparatus is well known to the those skilled in the art.
  • Advantageously, the pulp is obtained by pulping recycled paper or paper board, e.g., corrugators trim, to obtain a recycled paper pulp and optionally mixing in appropriate amounts of the additive for varying the moisture and/or water resistance of the container, colourant and biocide.
  • The fibrous material, e.g., recycled paper or paper board, may be added to the pulper pre-shredded. Typically, the solid content of the pulp is up to about 10 wt. %, based on the total weight of the solid. An appropriate an amount of water relative to the amount of fibrous may be added in order to achieve the desired solids content. In certain embodiments, the solids content in the pulper is less than about 8 wt. %, or less than about 6 wt. %, or less than about 5 wt. % or less than about 4 wt. %, or less than about 3 wt. %, or less than about 2 wt. %. In certain embodiments, the solids content in the pulper is about 1-6 wt. %, for example, from about 2-5 wt. %, or from about 3-5 wt. %, or from about 3-4 wt. %, or from about 3.5-4.5 wt. %.
  • Typically, the additive for varying the moisture and/or water resistance of the container, e.g., wax, and optional colourant and biocide are added during pulping in suitable amounts depending on the desired composition of the container. In certain embodiments, the biocide, when present, may be added in the water feed to the pulper, for example, added in the white water tank fluidly connected to the pulper. Following pulping, the resultant pulp is forwarded to the moulding apparatus. The solids content of the pulp may be reduced (i.e., by making down with additional water) as it passed to the moulding apparatus. In certain embodiments, the solids content of the pulp is less than about 2 wt. % for moulding, for example, between about 1 and 2 wt. %, or from about 1.4 to about 1.8 wt. %, or from about 1.5 to about 1.7 wt. %. The pulp is typically stored in a pulp tank.
  • In preferred embodiments, the container is vacuum moulded from the pulp. In certain embodiments, a wire mesh mould tailored to the shape of the container is submerged in a vat (or any other suitable means for storing the pulp) comprising the pulp. In these embodiments, the wire mesh mould would be regarded as a “male” tool with a cavity or cavities protruding upwards from a substantially flat base. A vacuum is then applied from within the mould tool. The vacuum pulls the paper on to the mesh surface of the tool and perforations in the body of the tool allow the water to pass through, leaving the pulp behind formed into the desired shape of container. In an alternative embodiment, the pulp is applied to the wire mesh mould by spraying, before the vacuum being applied as described above. The moulded container is then transferred to a drying stage.
  • Typically, the container is removed from the mould by suction and then set down on a conveyor belt (with the back surface of the tray (which in use would be the base of the tray) facing upwards. In a preferred embodiments, the setting down during transfer includes the use of air, known as transfer air, to blow the tray from the transfer on the conveyor belt. In advantageous embodiments, the air flow is reduced or controlled to cause the tray to settle gently on the conveyor belt so to control the extent of the flange. In this respect, the greater the force with which the tray meets the conveyor belt, the greater the flange portion that forms because the outer rim of the container tends to be pushed out upon contact with the surface of the conveyor belt.
  • Following transfer and set down the container is dried and then sent for storage or packaging. Drying may be performed by any suitable drying means, for example, a drying oven. In a preferred embodiment, drying is performed using super-heated steam, e.g., using a Merrill Airdyne dryer. This advantageously reduces the drying time, for example, to 15 mins or less per container, for example, 12 mins or less, or about 10 mins.
  • In certain advantageous embodiments, the container whilst attached to the mould is subjected to a wet press, typically applied to the back surface of the container using a “female” mould complimentary in form to the “male” moulding tool. This has the advantage of compacting the container and also serves to reduce the water content, pre-drying, by up to about 10 wt. %. This means less energy is required in the drying stage because there is less water to dry out from the tray. Further, the wet press tends to smooth out the back surface of the container, which can be aesthetically pleasing to the eye. The container is then ready for application of the polymeric film, as described above.
  • In certain embodiments, the container is manufactured at a first location, and then transported to a second location for packaging, e.g., with fresh produce, followed by application of the polymeric film.

Claims (19)

1-23. (canceled)
24. A container having an opening sealed with a polymeric film, wherein the container is formed from a pulpable, fibrous material, wherein less than 50% of the surface area of the polymeric film is in contact with the container, the container having a rim about the opening, wherein the rim comprises a flange extending outwards from, and about, the perimeter of the opening, the seal formed between the polymeric film and the flange, wherein the seal formed between the polymeric film and the flange is the only point of contact between the polymeric film and the container, wherein the polymeric film is bonded to fibres of the container, wherein the sealed container is free of adhesive, and wherein the polymeric film has a thickness of from 5 μm to 50 μm.
25. A container according to claim 24, wherein the seal is formed by the application of heat and/or pressure as the polymeric film is placed over the opening.
26. A container according to claim 24, wherein the container is moulded.
27. A container according to claim 24, wherein the container is formed from a composition comprising a fibrous pulp and wax, for example, paraffin wax.
28. A container according to claim 27, wherein the fibrous pulp is derived from recycled paper.
29. A container according to claim 24, wherein the body of the container comprises at least 90 wt. % fibrous material and from 0.1 to 10 wt. % wax.
30. A container according to claim 24, wherein the polymeric film is recyclable and/or biodegradable.
31. A container according to claim 24, wherein the container is approximately rectangular in plan view.
32. A container according to claim 24, wherein the polymeric film comprises a tab portion sized and configured to enable a user to remove, for example, tear or peel, the polymer film from the container.
33. A container according to claim 24, wherein the polymeric film is breathable, for example, comprises perforations.
34. A container according to claim 24, further comprising an article of commerce contained therein.
35. A container according to claim 34, wherein the article of commerce is fresh produce, for example, pieces of fruit and the like.
36. A container according to claim 24, wherein the polymeric film has a thickness of at least 20 μm.
37. A method of making a sealed container, said method comprising placing a polymeric film over an opening of a container which is formed from a pulpable, fibrous material, and sealing the opening with the polymeric film by the application of heat and/or pressure to the polymer film and/or container, whereby less than 50% of the surface area of the polymeric film is in contact with the container, the container having a rim about the opening, wherein the rim comprises a flange extending outwards from, and about, the perimeter of the opening, and a seal formed between the polymer film and the flange, and wherein the seal formed between the polymeric film and the flange is the only point of contact between the polymeric film and the container, wherein at least a portion of the polymeric film melts upon the application of said heat and/or pressure, thereby bonding the polymer film to the fibres of the container, wherein the seal between the polymeric film and the container is achieved without the need for an adhesive, and wherein the polymeric film has a thickness of from 5 μm to 50 μm.
38. A method according to claim 37, wherein the polymeric film has a thickness of at least 20 μm.
39. A method of packaging an article of commerce in a container, said method comprising placing an article of commerce in a container having an opening and which is formed from a pulpable, fibrous material, placing a polymeric film over the opening, and sealing the opening with the polymeric film by the application of heat and/or pressure to the polymer film and/or container, whereby less than 50% of the surface area of the polymeric film is in contact with the container, the container having a rim about the opening, wherein the rim comprises a flange extending outwards from, and about, the perimeter of the opening, and a seal formed between the polymer film and the flange, wherein the seal formed between the polymeric film and the flange is the only point of contact between the polymeric film and the container, wherein at least a portion of the polymeric film melts upon the application of said heat and/or pressure, thereby bonding the polymer film to the fibres of the container, wherein the seal between the polymeric film and the container is achieved without the need for an adhesive, wherein the polymeric film has a thickness of from 5 μm to 50 μm.
40. A method according to claim 39, wherein the article of commerce is fresh produce.
41. A method according to claim 39, wherein the polymeric film has a thickness of at least 20 μm.
US14/877,232 2014-10-08 2015-10-07 Sealed fibrous container Abandoned US20160122108A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US15/862,161 US20180222658A1 (en) 2014-10-08 2018-01-04 Sealed fibrous container

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1417795.0 2014-10-08
GB1417795.0A GB2522295B (en) 2014-10-08 2014-10-08 Sealed fibrous container

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US15/862,161 Continuation US20180222658A1 (en) 2014-10-08 2018-01-04 Sealed fibrous container

Publications (1)

Publication Number Publication Date
US20160122108A1 true US20160122108A1 (en) 2016-05-05

Family

ID=51947042

Family Applications (2)

Application Number Title Priority Date Filing Date
US14/877,232 Abandoned US20160122108A1 (en) 2014-10-08 2015-10-07 Sealed fibrous container
US15/862,161 Abandoned US20180222658A1 (en) 2014-10-08 2018-01-04 Sealed fibrous container

Family Applications After (1)

Application Number Title Priority Date Filing Date
US15/862,161 Abandoned US20180222658A1 (en) 2014-10-08 2018-01-04 Sealed fibrous container

Country Status (6)

Country Link
US (2) US20160122108A1 (en)
EP (1) EP3006370B1 (en)
CA (1) CA2907128C (en)
ES (1) ES2689734T3 (en)
GB (1) GB2522295B (en)
PL (1) PL3006370T3 (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2522295B (en) 2014-10-08 2016-03-09 Evesham Specialist Packaging Ltd Sealed fibrous container
USD866249S1 (en) 2016-03-22 2019-11-12 Zume, Inc. Food container cover
USD900558S1 (en) 2016-03-22 2020-11-03 Zume, Inc. Food container
US20170275077A1 (en) 2016-03-22 2017-09-28 Zume Pizza, Inc. Container for transport and storage of food products
USD893247S1 (en) 2016-03-22 2020-08-18 Zume, Inc. Food container base
ITUA20162339A1 (en) * 2016-04-06 2017-10-06 Alessandra Garzillo SYSTEM FOR PACKAGING AND TRANSPORT OF FOOD AND ITS USE IN A METHOD FOR SUSTAINABLE FOOD
USD861422S1 (en) 2016-08-18 2019-10-01 Zume, Inc. Food container base
TW201906772A (en) 2017-07-07 2019-02-16 美商促美股份有限公司 Container for transport and storage of food products
NO20181681A1 (en) * 2018-04-19 2019-10-21 Bama Packaging As Packaging box for fruit, berries and vegetables
USD884486S1 (en) 2018-07-12 2020-05-19 Zume, Inc. Food container
IT201800010152A1 (en) * 2018-11-08 2020-05-08 Banco Lab S R L CUSTOMIZED GUIDE SYSTEM AND METHOD FOR CHOOSING ORDERING FROM A MENU
USD918712S1 (en) 2019-02-11 2021-05-11 Zume, Inc. Food container
USD992963S1 (en) 2019-08-15 2023-07-25 Zume, Inc. Lid for a food container
WO2021258225A1 (en) * 2020-06-26 2021-12-30 Wenco S.A. Container with sealable body for packaging and transporting fruit and vegetable produce and method for applying a sealing film to the container
ES1257353Y (en) 2020-09-10 2021-04-05 Grupo Celulosas Moldeadas S L Recyclable and biodegradable packaging for food
BE1028318B1 (en) * 2020-11-16 2021-12-13 Dsp Food Nv CARDBOARD CONTAINER WITH FOIL FOR FRESH PRODUCTS AND PROCEDURE FOR PACKAGING FRESH PRODUCTS IN CARDBOARD CONTAINER

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3153505A (en) * 1963-01-28 1964-10-20 Packaging Corp America Package construction
US6042862A (en) * 1997-03-11 2000-03-28 Cryovac, Inc. Lidded package having a tab to facilitate peeling
US20020063070A1 (en) * 1998-12-23 2002-05-30 Cryovac, Inc. Modified atmosphere package for high profile products from upwardly formed heat shrinkable film
US6627273B2 (en) * 2001-03-13 2003-09-30 Cryovac, Inc. Lidstock laminate
US20120279895A1 (en) * 2002-03-15 2012-11-08 Graphic Packaging International, Inc. Container having a rim or other feature encapsulated by or formed from injection-molded material
US20120292226A1 (en) * 2011-05-18 2012-11-22 Powertray, LLC Disposable food tray
US20120312716A1 (en) * 2011-06-13 2012-12-13 Mikulka John M One compartment food tray

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3123960A (en) 1964-03-10 Apparatus for preparing
US2990948A (en) 1958-04-04 1961-07-04 Johnson & Johnson Sterile package
GB1111525A (en) 1964-06-18 1968-05-01 Keyes Fibre Co Thermoplastic coating of molded pulp
US3217962A (en) * 1964-06-22 1965-11-16 Plastic Packaging Corp Packaging means
US3615707A (en) * 1970-03-18 1971-10-26 North Pacific Canners & Packer Hermetically sealed container with readily detachable protective cover
US4012530A (en) * 1975-07-07 1977-03-15 Mobil Oil Corporation Produce tray
US4365456A (en) 1976-05-05 1982-12-28 The Mead Corporation Method of and apparatus for packaging
ES2129995T5 (en) 1997-04-22 2007-04-01 OMNI-PAC EKCO GMBH & CO. KG VERPACKUNGSMITTEL PROCEDURE FOR CLOSING A COMPOSITE TRAY OF NATURAL FIBERS AND / OR ALMIDON WITH A SEALABLE SHEET, THE ASI CLOSED TRAY AND THE CONFIGURED PACKAGING UNIT OF THIS MODE.
JP2002096813A (en) * 2000-09-19 2002-04-02 Nk Kogyo Kk Pulp container
GB2444913B (en) * 2006-09-20 2009-08-19 Procurasell Internat Packaging Method and apparatus for manufacturing a food packaging container
GB2449507A (en) * 2007-07-25 2008-11-26 Procurasell Holdings Ltd Method and apparatus for manufacturing a food packaging container
JP5181760B2 (en) * 2008-03-21 2013-04-10 凸版印刷株式会社 Pulp mold container
WO2009136783A1 (en) 2008-05-08 2009-11-12 Huhtamaki Nederland B.V. Food packaging
DE102009004817A1 (en) * 2009-01-13 2010-07-15 Huhtamäki Oyj packaging
US20120055981A1 (en) * 2009-05-26 2012-03-08 Meadwestvaco Corporation Hermetically sealed containers
US20110101077A1 (en) * 2009-10-29 2011-05-05 Power Source & Associates Corp. Paper-made container
US20110311688A1 (en) 2010-06-22 2011-12-22 Cryovac, Inc. Package comprising on-demand collapsible support member
ITMI20101463A1 (en) * 2010-08-03 2012-02-04 Cartonspecialist S R L FOOD BOARD IN CARDBOARD PROVIDED WITH PELABILE CLOSURE SEASONED.
GB201300988D0 (en) * 2013-01-21 2013-03-06 Lynch Ronan Espulp ripened fruit tray
GB2522295B (en) 2014-10-08 2016-03-09 Evesham Specialist Packaging Ltd Sealed fibrous container

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3153505A (en) * 1963-01-28 1964-10-20 Packaging Corp America Package construction
US6042862A (en) * 1997-03-11 2000-03-28 Cryovac, Inc. Lidded package having a tab to facilitate peeling
US20020063070A1 (en) * 1998-12-23 2002-05-30 Cryovac, Inc. Modified atmosphere package for high profile products from upwardly formed heat shrinkable film
US6627273B2 (en) * 2001-03-13 2003-09-30 Cryovac, Inc. Lidstock laminate
US20120279895A1 (en) * 2002-03-15 2012-11-08 Graphic Packaging International, Inc. Container having a rim or other feature encapsulated by or formed from injection-molded material
US20120292226A1 (en) * 2011-05-18 2012-11-22 Powertray, LLC Disposable food tray
US20120312716A1 (en) * 2011-06-13 2012-12-13 Mikulka John M One compartment food tray

Also Published As

Publication number Publication date
EP3006370B1 (en) 2018-07-04
CA2907128C (en) 2016-12-06
GB201417795D0 (en) 2014-11-19
GB2522295A (en) 2015-07-22
US20180222658A1 (en) 2018-08-09
CA2907128A1 (en) 2016-04-08
GB2522295B (en) 2016-03-09
PL3006370T3 (en) 2018-11-30
EP3006370A2 (en) 2016-04-13
ES2689734T3 (en) 2018-11-15
EP3006370A3 (en) 2016-06-08

Similar Documents

Publication Publication Date Title
CA2907128C (en) Sealed fibrous container
ES2872448T3 (en) Packaging unit comprising lignocellulosic biomass not originated from wood and manufacturing method of said packaging unit
US20100127059A1 (en) Packaging systems for the control of relative humidity of fresh fruits, vegetables and flowers with simultaneous regulation of carbon dioxide and oxygen
ES2877710T3 (en) Biodegradable moisture resistant composition
CN101176482B (en) Fabric nonwoven cloth fruit and vegetable preservative film series product
JP6636980B2 (en) Package suitable for maintaining freshness of fruits and vegetables, and method for maintaining freshness of fruits and vegetables
CN106998715A (en) Antimicrobial covering
WO2017134431A1 (en) Lidding film, sealed container, processes for producing a lidding film and for sealing a container and manufacturing system for a sealed container
GB2507385A (en) Moulded tray for fresh produce
EP4029805A1 (en) Sealed fibrous container
JP2022132509A (en) Package storing vegetables and fruits, and method for retaining freshness of vegetables and fruits
Jacob A handbook on post harvest management of fruits and vegetables
JP6644018B2 (en) A package excellent in freshness maintaining performance of fruits and vegetables including radish, and a method of maintaining freshness of fruits and vegetables
JP6674407B2 (en) A package excellent in freshness keeping performance of fruits and vegetables, and a method of keeping freshness of fruits and vegetables
JP6636981B2 (en) A package excellent in freshness keeping performance of fruits and vegetables, and a method of keeping freshness of fruits and vegetables
JP6735250B2 (en) Package excellent in freshness-keeping performance of fruits and vegetables containing lettuce, and freshness-keeping method of fruits and vegetables
Pascall et al. Fresh vegetables and vegetable products packaging
JPS6211049A (en) Freshness retaining of vegetable and fruit
JP2019177917A (en) Package storing vegetables and fruits, and method for retaining freshness of vegetables and fruits
JP6636979B2 (en) A package excellent in freshness maintaining performance of fruits and vegetables including cabbage, and a method of maintaining freshness of fruits and vegetables
Giuggioli et al. Packaging in the fresh fruit and vegetable supply chain: innovation and sustainability
JP6636988B2 (en) Package suitable for maintaining freshness of fruits and vegetables including radish, and method of maintaining freshness of fruits and vegetables
JP6674408B2 (en) A package excellent in freshness maintaining performance of fruits and vegetables including cabbage, and a method of maintaining freshness of fruits and vegetables including cabbage
Dani et al. A review of food packaging materials and its impact on environment
Bhardwaj et al. Quality Characteristics of Packaging Materials and Containers Used for Storage of Fresh Produce

Legal Events

Date Code Title Description
AS Assignment

Owner name: EVESHAM SPECIALIST PACKAGING LIMITED, UNITED KINGD

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LYNCH, RONAN;REEL/FRAME:037368/0111

Effective date: 20151217

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION