EP2265505A1 - Plateau moulé profond - Google Patents

Plateau moulé profond

Info

Publication number
EP2265505A1
EP2265505A1 EP09722119A EP09722119A EP2265505A1 EP 2265505 A1 EP2265505 A1 EP 2265505A1 EP 09722119 A EP09722119 A EP 09722119A EP 09722119 A EP09722119 A EP 09722119A EP 2265505 A1 EP2265505 A1 EP 2265505A1
Authority
EP
European Patent Office
Prior art keywords
plastic
tray
rim
coating
card board
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.)
Withdrawn
Application number
EP09722119A
Other languages
German (de)
English (en)
Inventor
Pekka Vähävihu
Juhani Lahtela
Aad Hoekstra
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.)
Huhtamaki Oyj
Original Assignee
Huhtamaki Oyj
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huhtamaki Oyj filed Critical Huhtamaki Oyj
Priority to EP09722119A priority Critical patent/EP2265505A1/fr
Publication of EP2265505A1 publication Critical patent/EP2265505A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/18—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient
    • B65D81/20—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas
    • B65D81/2069—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas in a special atmosphere
    • B65D81/2076—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas in a special atmosphere in an at least partially rigid container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/0077—Shaping by methods analogous to moulding, e.g. deep drawing techniques
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers 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
    • B65D1/34—Trays or like shallow containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers 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
    • B65D1/34—Trays or like shallow containers
    • B65D1/36—Trays or like shallow containers with moulded compartments or partitions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/59—Shaping sheet material under pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package
    • B65D81/343—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package specially adapted to be heated in a conventional oven, e.g. a gas or electric resistance oven

Definitions

  • the invention is directed to a deep pressed plastic coated tray of any shape made from card board with one or more compartments of any shape with at least rounded corners or with a round or oval shape and a rim area surrounding the tray and/or the compartments.
  • plastic trays are well known for packaging especially frozen food and modified atmospheric packaging (MAP) which could be able to be heated in an conventional or microwave oven.
  • MAP frozen food and modified atmospheric packaging
  • plastic trays are using a lot of raw material and are therefore expensive also according to the premium raw materials which have to be used to have temperature stability when the packaging is heated in an oven. Further the used plastic materials can not be based on renewable resources.
  • Such plastic trays are often made from crystallized polyester (CPET), polypropylene (PP) or other plastic materials and are normally sealed with a film and are often at least partially surrounded by a carton sleeve.
  • CPET crystallized polyester
  • PP polypropylene
  • the packaged goods are hermetically sealed in a modified atmosphere so that it provides a longer shelf life for fresh food, e.g. for sliced meat, salad or prepared dishes.
  • the packaging has to be gas, liquid and diffusion proof.
  • the packaging material has to have high barrier characteristics and a low gas permeability.
  • adhesives are always problematic. To apply adhesives an additional production step has to be introduced. The adhesives themselves may also diffuse towards the packaged food and may contaminate the food. Further the adhesives may have a higher permeability and a lower barrier characteristic.
  • the purpose of the invention is to produce deep pressed card board trays which can be closed tightly by sealing a film or lid of plastic or plastic coated material to the top part.
  • the rounded areas having wrinkles wherein in the rim area the wrinkles are flattened by melted plastic material from the coating. Further it has been very advantageous in this context if a closing lid or film of plastic or plastic coated material is sealed to the rim.
  • the plastic coated material can be extrusion or dispersion coated or treated with plastic materials with other means. Further the plastic coating can be produced by laminating a plastic film to another material, which could be selected from paper or cardboard or other materials.
  • the plastic coating is made from high temperature resistant plastic material.
  • the tray containing food can be heated in an oven.
  • the plastic coating is temperature resistant up to 250 0 C, preferably up to 220 0 C.
  • Another most advantageous embodiment of the invention is if the intersection between the rim and the tray walls and/or the intersection between the tray walls and the bottom walls is defined by a radius.
  • a printing is applied to the inside and/ or the outside of the card board at least in the area of the bottom wall and/or the side walls of the tray.
  • a printing applied directly to the inside and/or the outside of the packaging saves an additional sleeve or label and therefore raw material and manufacturing steps. No protective packaging, labels, sleeves or the like are required for product information and protection of the packaging.
  • plastic coated paper tray is formed which can be easily be tightly sealed with a film or lid of plastic or plastic coated material.
  • the plastic material is applied by extrusion coating or is laminated to the card board.
  • plastic coating can be also applied after the printing has been applied.
  • the flattening process of the rim areas of the tray is performed by sonotrodes arranged in each of the corner areas and the plastic coating of the card board is melted precisely only in the wrinkled areas.
  • the tray is closed.
  • the packaged stuff e.g. food is protected against harmful influences.
  • Fig. 1 is a picture of a plastic coated card board tray with rounded corners having wrinkles which are flattened
  • Fig. 2 is a cross section of this tray through a corner area before the ultrasonic treatment had been applied
  • Fig. 3 is a cross section of this tray through a corner area after the ultrasonic treatment had been applied
  • Fig. 4 is a picture of another tray having two compartments and
  • Fig. 5 is a picture of a flattening process of the rim.
  • Fig. 1 is a tray formed from a layer of card board 2 to which a plastic layer 3 is coated.
  • the plastic layer 3 is arranged on the inside of the tray 1.
  • the tray 1 defines one or more compartments 4, in which food can be placed.
  • the tray consists of a bottom wall 5, side walls 6 arranged around the bottom wall 5. On the free ends of the side walls 6 a rim 7 is linked to them.
  • the rim 7 surrounding the tray 1 is defined to be the outer rim 7a.
  • the rim 7 is aligned in an plane parallel to the the plane of the bottom wall 5.
  • Two compartments 4 are divided by a bar 8, which itself is formed by side walls 6 and probably by an intermediate rim 7b, directly connected to the outer rim 7a. They together are forming the rim 7.
  • the corners 9 of the tray 1 and the compartments 4 are rounded. In these areas wrinkles 10 occur due to the deep pressing process step. The material forming the rounded corners is larger than the corner itself. Therefore the additional material is pressed in those wrinkles 10. The wrinkles 10 are extending into the rim 7.
  • a plastic film 11 is sealed to the rim 7 to close the packaging.
  • the rim 7 is flattened before the film 11 is sealed to it. By flattening the rim in the corner areas a gas and liquid tight sealing of the film 11 is guaranteed.
  • printing 12 can be applied directly to the card board layer 2.
  • An overlacquer 13 can cover the printing 12 to protect it against damage, especially mechanical damage. The overlacquer 13 also protects the card board layer 2 against moisture and liquids.
  • a printing 14 can be arrange for example in the area of the bottom wall 5.
  • This printing 14 is also directly applied to the card board layer 2.
  • the plastic coating 3 is applied afterwards covering the printing 14 and therefore not allowing direct contact between the packaged goods and the printing colour used for the printing 14. This helps to avoid contamination of the packaged goods, what is very important especially for food.
  • the printings 12 and 14 can be applied for example in a multicolour flexo -printing process.
  • the plastic layer can be extrusion coated to the card board-layer or can be laminated to it.
  • intersection between the rim 7 and the side walls 6 is made out with a radius to avoid excessive stretching of the plastic layer 3 in these areas. This is also to avoid pinhole damages in the plastic layer 3.
  • the corner areas 9 of the rim 7 are flattened by an ultrasonic treatment only in these areas 15 by sonotrodes 16 having the shape of the corner areas 9. For each corner area a separate sonotrode 16 can be arranged.
  • a unit consisting of a generator, a converter, an amplifier, at least one sonotrode having the appropriate shape and a counter plate is used.
  • the used frequency can be between 20 and 70 kHz.
  • the used power is depending on the plastic material sealed together and has been adjusted in tests between 1 and 5 kW depending on the frequency. In these tests a frequency of 35kHz has been used with IkW and a frequency of 2OkHz has been used with 2, 4 and 5 kW.
  • the treatment is not necessarily done over the whole width of the rim. In examples only part of the width had been treated with good results. In these examples only a width of 6 mm had been treated and thereby flattened.
  • a treatment head, containing the sonotrode is pressed against the product surface.
  • E.g. mechanical or pneumatical means can be used for pressing the sonotrode against the product surface.
  • the plastic layer 3 is molten.
  • the molten plastic material fills the vertically oriented channels of the wrinkles 10.
  • a flat surface of the rim 7 is formed.
  • the produced heat is spread not only over the treated area. It also penetrates the channels and therefore produces a smooth filling of the channels.
  • a classical heat treatment does not penetrate the channels. Instead it causes burnings on the upper end of the plastic coating while the lower parts of the channels are not heated in such a way that the plastic material is molten.
  • the ultrasonic treatment according to the present invention causes a smooth and flat rim without thinning the plastic material too much.
  • Tight sealable packages for food can be produced.
  • the sonotrodes can be arranged for example at a machine for deep pressing the tray or at the sealing apparatus. Therefore no separate machine has to be constructed. Further no separate handling for the ultrasonic treatment except of the treatment itself is necessary.
  • the ultrasonic treatment can be carried out as a separate production step or inline with the deep pressing process.
  • the ultrasonic treatment is directly linked to the forming apparatus.
  • the ultrasonic treatment can also be carried out in a separate ultrasonic treatment machine.
  • pre coated board For the cardboard layer 2 pre coated board can be used. Solid bleaches sulphate board from virgin fibres has prooven good results.
  • the grammages used are ranging from 170 to 600 g/m 2 , preferably from 315 to 420 g/m 2 .
  • the card boards are selected according to their fibre content. Food approved grades are preferred.
  • polyethyleneterephtalate or polybuteinterephtalate are preferred.
  • Other plastic material or dispersion coatings can be used.
  • the plastics can be transparent or pigmented. White or black pigmentation is a preferred embodiment.
  • For inside printing 14 at least partly transparent plastic material should be used.
  • the plastic material is selected according to the intended use, their temperature resistance and their sealability.
  • a temperature resistance up to 220 0 C, extremely up to 250 0 C is preferred for ovenable packages.
  • the coating is applied in an amount of 5 to 100 g/m 2 in the extrusion coating process, preferably in an amount of 40 to 70 g/m 2 .
  • Examples have been made with a coating in an amount of 60 g/m 2 .
  • PET can be applied in an amorphous form, which chrystalized during the deep pressing process step according to the head used in this step.
  • plastic layer 3 When the plastic layer 3 is applied to the card board layer 2 by extruding or laminating thin plastic coatings between 5 and 100 microns, preferably between 17 and 50 microns can be applied.
  • the plastic film can be oriented. It is adhered to the card board layer 2.
  • the radius of the intersection between the side walls 6 and the rim 7 and also between the bottom wall 5 and the side walls 6 has to be increased to avoid pinholes in the plastic coating.
  • the film 11 can be produced from plastic material or plastic coated materials, coated by extrusion or dispersions, wherein the coatings could be applied on paper or cardboard materials, or materials laminated with plastic materials by extrusion laminating or seperately laminating, whereby the materials laminated with the plastics could be selected from paper or cardboard.
  • a lid made from materials as described before could be used. Further it is imaginable that a combination of a film and a lid is used.
  • barrier layers are possible.
  • the film 11 and/or the plastic coating 3 multilayer films can be used.
  • the film 11 is sealed to the rim 7 by a well known sealing process.
  • the main difference and advantage of the present invention is that the seal is also tight in the corner areas 9.
  • the new packaging according to the present invention has no need for separate labels or sleeves. Supplemental to the tray surfaces the film 1 1 gives an additional print area.
  • the packaging is resistant against damages. It has a rigid structure when closed, it is tamper evident, it possesses a good puncture resistance, it has a wide temperature resistance between around -40 0 C and over 200 0 C and it has -compared with aluminium and most plastic trays- good insulation properties during handling.
  • packaging is mostly produced from renewable resources.
  • the plastic part is only a minor part of the complete packaging.
  • the empty package can be safely discarded via paper recycling or similar.
  • Sonotrodes according to the present invention are meant to be means for ultrasonic treatment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Laminated Bodies (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)

Abstract

La présente invention concerne un plateau (1) moulé profond revêtu de plastique, de forme quelconque et fabriqué en carton. Il est pourvu d’un ou de plusieurs compartiments de forme quelconque présentant au moins des angles arrondis (9), ou de forme ronde ou ovale, et une zone de bordure (7) entourant le plateau (1) et/ou les compartiments, les zones arrondies présentant des plis (10). Dans la zone de bordure (7), les plis (10) sont aplanis par une matière plastique fondue provenant du revêtement.
EP09722119A 2008-03-20 2009-03-19 Plateau moulé profond Withdrawn EP2265505A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09722119A EP2265505A1 (fr) 2008-03-20 2009-03-19 Plateau moulé profond

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP08102814A EP2193997A1 (fr) 2008-03-20 2008-03-20 Plateau par étirage profond
EP09722119A EP2265505A1 (fr) 2008-03-20 2009-03-19 Plateau moulé profond
PCT/EP2009/053265 WO2009115582A1 (fr) 2008-03-20 2009-03-19 Plateau moulé profond

Publications (1)

Publication Number Publication Date
EP2265505A1 true EP2265505A1 (fr) 2010-12-29

Family

ID=39666054

Family Applications (2)

Application Number Title Priority Date Filing Date
EP08102814A Withdrawn EP2193997A1 (fr) 2008-03-20 2008-03-20 Plateau par étirage profond
EP09722119A Withdrawn EP2265505A1 (fr) 2008-03-20 2009-03-19 Plateau moulé profond

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP08102814A Withdrawn EP2193997A1 (fr) 2008-03-20 2008-03-20 Plateau par étirage profond

Country Status (2)

Country Link
EP (2) EP2193997A1 (fr)
WO (1) WO2009115582A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201000310D0 (en) * 2010-01-08 2010-02-24 Linpac Packaging Ltd Container
US20160288978A1 (en) * 2013-12-04 2016-10-06 Billerudkorsnäs Ab Sealable package and production thereof
GB2541869A (en) * 2015-08-24 2017-03-08 Cc Pack Ab Packaging tray
GB201810150D0 (en) * 2018-06-20 2018-08-08 Rapid Action Packaging Ltd A fold flat tray

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060180646A1 (en) * 2003-10-20 2006-08-17 Fort James Corporation Lidded paperboard container

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5234159A (en) * 1991-01-14 1993-08-10 Conagra, Inc. Container/lid assembly
JP2000033927A (ja) * 1998-07-16 2000-02-02 Dainippon Printing Co Ltd 深絞り紙トレーの製造方法
WO2003101839A1 (fr) * 2002-05-31 2003-12-11 Toppan Printing Co., Ltd. Recipient de papier etire et procede de fabrication de ce recipient
JP2005053554A (ja) * 2003-08-06 2005-03-03 Toppan Printing Co Ltd 絞り成形密閉紙容器

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060180646A1 (en) * 2003-10-20 2006-08-17 Fort James Corporation Lidded paperboard container

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2009115582A1 *

Also Published As

Publication number Publication date
EP2193997A1 (fr) 2010-06-09
WO2009115582A1 (fr) 2009-09-24

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