• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    ABSTRACT The invention concerns a container for food products or other sensitiveproducts, said container being made of a material that intends to provide thecontainer with gas-tight properties and that comprises a layer that exhibits noor only a low translucence to light. The invention is characterized in that atleast one opening is provided in the layer with no or low light translucencesuch as to allow light for non-destructive detection of gas inside the containerto enter and exit through said at least one opening. The invention alsoconcerns a method for detecting gas inside a sealed container of the abovetype and a method for manufacturing of a container of the above type fromblanks of a cardboard based material. The invention also concerns aproduction system comprising an apparatus for filling containers of the abovetype with a product and an apparatus for sealing the filled containers,wherein the system further comprises an apparatus for carrying out themethod for detecting gas inside the sealed container. (Figure 1)
    公开号:SE1251491A1
    申请号:SE1251491
    申请日:2012-12-21
    公开日:2014-06-22
    发明作者:Simon Holka；Lennart Aveling
    申请人:Carton Lund Ab R；
    IPC主号:
    专利说明:

    2012-12-21P41207211SE00 Container for food products and method for detecting internal gas TECHNICAL FIELD This invention relates to a container for food products or other sensitiveproducts, said container being made of a material that intends to provide thecontainer with gas-tight properties and that comprises a layer that exhibits noor only a low translucence to light. The invention is characterized in that atleast one opening is provided in the layer with no or low light translucencesuch as to allow light for non-destructive detection of gas inside the containerto enter and exit through said at least one opening. The invention alsoconcerns a method for detecting gas inside a sealed container of the abovetype and a method for manufacturing of a container of the above type fromblanks of a cardboard based material. The invention also concerns aproduction system comprising an apparatus for filling containers of the abovetype with a product and an apparatus for sealing the filled containers,wherein the system further comprises an apparatus for carrying out themethod for detecting gas inside the sealed container.
    BACKGROUND OF THE INVENTION Many food products are packaged in sealed gas-tight containers with acontrolled internal atmosphere as to protect the food stuff and prolong shelf-life etc. Typically, a headspace of the food container, i.e. the space inside thecontainer above the food and below the seal, is evacuated or contains closeto 100% nitrogen gas to avoid the presence of oxygen gas.
    For quality and safety reasons it is sometimes necessary to check the statusof the internal atmosphere that is in contact with the food product.Traditionally, the methods for this purpose involve puncturing the containerwhich leads to waste of both products and packages. ln an alternative method described in WO2010/145892 a laser source is used to direct light through the container wall and into (the headspace of) the package. Scattered light enters the package and interacts with gas inside thepackage. By measuring, in a position outside of the package, an absorptionsignal of the light that exits the package it is possible to measure e.g. theconcentration of oxygen gas inside the package without puncturing it. Onlythe light, incoming and outgoing, needs to pass through the walls or lid of thepackage. The package may appear non-transparent but it is sufficient thatthe package is translucent to a certain wavelength range of the laser light.
    The method of WO2010/145892 is very useful in many applications but is notapplicable to containers made of a material that is not translucent to light,such as a multilayer laminate where an aluminium foil forms one of thelayers. Container materials of this type include e.g. cardboard laminates used for food in dry powder form.
    There is thus a need for improvements with regard to methods for checkingthe status of the internal atmosphere in containers made of a material that is not translucent to light.
    SUMMARY OF THE INVENTION The invention concerns a container for food products or other sensitiveproducts, said container being made of a material that intends to provide thecontainer with gas-tight properties and that comprises a layer that exhibits no or only a low translucence to light.
    The invention is characterized in that at least one opening is provided in thelayer with no or low light translucence, such as to allow light for non-destructive detection of gas inside the container to enter and exit through said at least one opening.
    Thereby, laser light can be allowed to enter the (headspace of the) container,interact with the gas present (if any) and exit via the same or another openingand be detected and analyzed outside of the container such as to check the content and concentration of the gas present. The technique described inWO2010/145892 is applicable but also other techniques can be used as thelight does not have to be scattered when passing into the container.
    Typically, the container has a bottom, walls and a sealing membrane orsea|ed |id on top.
    The term gas-tight properties is used in the common-sense meaning, i.e. itmeans as gas-tight as reasonably achievable. No material is 100% gas-tight over time. ln an embodiment of the invention the opening is covered with a coveringmaterial that has a high translucence to light. The covering material may thus be transparent to light.
    Preferably, the covering material forms gas barrier and/or the at least oneopening is sufficiently small so as to avoid that the overall gas-tightness ofthe container is significantly reduced. Thus, a container that has a smallopening covered with e.g. a layer of plastic material can still be “gas-tight”.
    Using a covering material makes it possible to use (a) larger opening(s). lngeneral terms, an opening with a side/diameter of around 0.1 mm can beused without covering material in a container having a volume of 1 liter. Suchan opening may be too small to allow enough light to exit for the analysis ofthe internal gas atmosphere. Openings/windows in the size 2x2 mm or 4x4mm may be sufficiently large for some gas detection techniques and may becovered by regular container multilayer plastic material depending on thetype of material and the size of the container.
    An opening size of at least 4x20 mm is required for some light reflectiontechniques. Such large openings need to be covered with a special material,i.e. a material with special gas permeability and/or special thickness. Using a special plastic material over the entire container structure would be toocostly. lt is possible to locally weld the special plastic material over theopenings but such an additional production step is also costly. A further method is described below.
    Preferably, at least a part of the at least one opening is positioned in anupper position of the container in a region intended to contain an internal gasatmosphere above a product placed in the container. Thereby, light can bedirected into the headspace when a filled container is placed in a normal position with its bottom facing downwards.
    Preferably, the at least one opening is arranged in a wall section of thecontainer. Alternatively, or as a complement, an opening can be placed in the sealing lid.
    To provide for a sufficiently gas-tight container, the at least one opening has preferably an opening area in the range...in relation to... ln a typical embodiment of the invention, the container is made of multilayerstructure comprising a layer of aluminium, wherein the at least one opening isarranged in the aluminium layer. The aluminium layer preferably has athickness in the range 4-40 um. This makes the aluminium layer gas-tight and non-translucent to light.
    Such a multilayer structure preferably also comprises a layer of a weldableplastic material that also forms the covering layer. The opening(s) can thusbe made in the aluminium layer before laminating the aluminium and plasticlayers to each other, during which process the covering layer will form iwhtouany special step. The covering layer can alternatively be formed by attachinga tape or similar to the laminate after having arranged the opening in the entire multilayer structure.
    Preferably, the multilayer structure also comprises a layer of a cardboard material that works as a supporting layer.
    The invention also concerns a method for determining a gas content in acontainer according to what is described above. This method comprises thesteps of directing light through the at least one opening into the container,and detecting light that exits from the container through the at least opening. ln variants of the inventive method the following may be applied: - the light directed into the container is emitted from a laser source, - the absorption of the light that exits the container is measured, - the container comprises more than one opening and the light enters thecontainer through a first opening and exits the container through a second opening.
    The invention also concerns a method for manufacturing of a containeraccording to above from blanks of a cardboard based material, said methodcomprising the steps of: providing a substantially plane blank of a multilayermaterial comprising a supporting cardboard layer, a weldable layer and analuminium layer, arranging at least one cut-out at a first edge of the blank, -forming a rounded container body from the blank by bending the blank suchas to connect said first edge with an opposite edge of the blank wherein ajoint is formed along the connected edges and an opening is formed at the atleast one cut-out, and applying a gas-tight and translucent strip of materialalong the joint in such a way that the opening is covered by the material strip.
    The invention also concerns a production system comprising i) an apparatusfor filling containers according to above with a product and ii) an apparatusfor sealing the filled containers, wherein the system further comprises iii) anapparatus for carrying out the method for detecting gas inside the sealed container.
    BRIEF DESCRIPTION OF DRAWINGSln the description of the invention given below reference is made to thefollowing figures, in which: Figure 1 shows, in a schematic view, a container according to anembodiment of the invention, Figure 2 shows, in a schematic view, the principle of a first embodiment ofthe inventive gas detection method applied to a container similarto what is shown in figure 1, and Figure 3 shows, in a schematic view, the principle of a second embodiment of the inventive gas detection method applied to a container similar to what is shown in figure 1.
    DESCRIPTION OF EXAMPLE EMBODIMENTS OF THE INVENTION Equipment for manufacturing of containers from blanks of a cardboard basedmaterial is described in e.g. EP0074343. Such equipment normally includesa container body forming unit where an initially cylindrical container body isformed from a substantially plane blank of a multilayer material comprising atleast a supporting cardboard layer and a weldable, plastic layer. In a weldingunit, an end closure, a bottom, is applied to the inside of the container bodyby inducing welding energy and melting the weldable layer. Such a weldedjoint is well known to be capable of being gas tight. After welding the bottomedge of the container body is normally processed in an edge shaping unitwhere the edge typically is folded, heated and curled to provide stability anda more appealing appearance. Also the body blank may be welded togetheras to form the cylindrical container body, but welding of the end closure is usually a more complex process step.
    Often both the container body and the end closure form multilayer structureswhere a weldable plastic film is applied to the inside of the cardboard basedlid and container. In particular for food products, the layer structure usuallyincludes a layer of aluminium arranged between the cardboard and theplastic layer. Typically, a high frequency current energy is induced in the aluminium layer, which foil thereby gets heated and in turn melts the plasticfilm. Automated equipment of this type further comprises transporting meansconfigured to transport a flow of containers from the container body formingunit to the welding unit and further downstream in the equipment.
    Equipment for filling the containers and for sealing and closing the filledcontainers can be arranged in connection to the container manufacturing equipment.
    The equipment and material described above are suitable for the container ofthe present invention. By providing one or both of the edges of the bodyblank with one or several cut-outs, one or several openings will form whenthe two edges are joined to each other, i.e. when the rounded container bodyis formed. By covering the joint or seam and the openings formed betweenthe edges with a strip of material that exhibits gas-barrier properties and thatis translucent and maybe also transparent to (laser) light, one or severaluseful windows (for later detection of gas inside the container) are formedalong the joint. This strip of material can be a tape, i.e. provided with anadhesive, and/or be welded to the two edges as to form a gas tight joint.
    The remaining manufacturing of the container can follow the conventional method.
    A schematical view of a container 1 of the type described above is shown infigure 1. The container 1 has a rounded wall section 4 formed by bending ablank as to form a joint 8 between edges of the wall section 4. Cut-outs hasbeen punched at both edges such that oblong openings 2 are formed alongthe joint 8. A gas-tight and translucent strip of material (not shown) has beenapplied along the joint 8 and covers the openings 2. The container 1 hasfurther a bottom closure 6 and has been filled with food product powder 3. Asealing membrane 5 seals an upper part of the container 1. A headspace 7 isformed between the powder 3 and the sealing membrane 5.
    The material forming the wall section 4 and the bottom 6 is a multilayermaterial comprising a supporting cardboard layer, a weldable layer and analuminium layer. The aluminium layer or foil has typically a thickness of 6.35or 9 um. Al-foils with larger thickness are sometimes used, e.g. 18 or 35-38um. Generally, the Al-layer can be said to a have thickness of 4-40 um.
    A method for manufacturing of the container 1 from blanks of a cardboardbased material comprises the steps of: - providing a substantially plane blank of a multilayer material comprising asupporting cardboard layer, a weldable layer and an aluminium layer, - arranging at least one cut-out at a first edge of the blank, - forming a rounded container body from the blank by bending the blank suchas to connect said first edge with an opposite edge of the blank wherein ajoint is formed along the connected edges and an opening is formed at the atleast one cut-out, - applying a gas-tight and translucent strip of material along the joint in such a way that the opening is covered by the material strip.
    The manufacturing method may also comprise one or several of the followingsteps: - welding the material strip to the edges, - fastening an end closure to the container body by generating an inductivewelding energy for melting of the weldable layer; and - transporting: a flow of body blanks to a container body forming unit; a flowof container bodies from the container body forming unit to a welding unit;and a flow of container bodies provided with end closures from the welding unit.
    Figure 2 shows, in a schematic view, the principle of a first gas detectionmethod applied to a container similar to what is shown in figure 1. Lightemitted from a laser source is directed through the opening 2 into the headspace 7 of the filled and sealed container 1 (solid arrow). Scattered lightexits the container 1 via the same window 2 (dashed arrow) and can bedetected and analyzed. This method is suitable if the opening 2 is coveredwith a material that scatters the incoming light, i.e. if the covering material is translucent but not transparent to the incoming light.
    Figure 3 shows, in a schematic view, the principle of a second gas detectionmethod applied to a container similar to what is shown in figure 1, but in thisexample the container 1 also has a second window 2'. Light emitted from alaser source is directed through the opening 2 into the headspace 7 of thefilled and sealed container 1 (solid arrow). Light propagates through theheadspace 7 in the same direction and exits the container 1 via the secondwindow 2' (dashed arrow) and can be detected and analyzed. This method issuitable if the opening 2 is covered with a material that is transparent to theincoming light. To improve the sensitivity of the method the light exiting thesecond window 2' can be reflected back towards the container 1 such as topass through the head space once again and exit through the first opening 2 and then detected and analyzed.
    How to detect and analyze the light, and how to determine the content of gasfrom such an analysis, is known as such to the person skilled in the art.
    The method for detecting gas inside a sealed container of the type discussedhere can be made “in-line”, i.e. it can form part of the production line wherethe containers e.g. are filled and sealed (under an atmosphere of protectiongas such as nitrogen), or it can be made “off-line”, i.e. separate from theproduction line. lf arranged “in-line” it can be arranged so that containers that e.g. contains too much oxygen are removed or marked in some way.
    Thus, a production system comprising e.g. an apparatus for filling containersof the above type with a product and an apparatus for sealing the filledcontainers preferably also comprises an apparatus for carrying out the method for detecting gas inside the sealed container. Such a systempreferably also comprises means for sorting out or marking containers thatexhibits an abnormal gas content. The system may also comprise anapparatus for manufacturing the containers and an apparatus for applying an outer lid to the containers.
    The invention is not limited by the embodiments described above but can bemodified in various ways within the scope of the claims.
    The material covering the opening can form part of one of the laminatedlayers in a laminated multilayer structure. Typically, this would be the layer ofweldable plastics in a cardboard-aluminium-plastics structure. To improve thegas barrier at the openings, the plastic material used can be prepared withstrips of a material that forms a better gas barrier than normal weldableplastics, wherein the orientation and distance between the strips are adaptedso that the strip covers the openings when the container is produced. Forinstance, this strip can be positioned in the laminating material so that itcovers the joint and openings when a container is formed from a plane blankas described above. Preferably, the strip protrudes from one of the edges ofthe blank such as to overlap the other edge when the edges are connected.The gas barrier material strip can alternatively be formed of a separate pieceof material applied onto the container such as to cover the at least oneopening and, if appropriate, also the joint.
    权利要求:
    Claims (17)
    [1] 1. Method for manufacturing of a container for food products or other sensitiveproducts from blanks of a cardboard based material, said container beingmade of a material that intends to provide the container with gas-tightproperties and that comprises a layer that exhibits no or only a lowtranslucence to light, wherein at least one opening is provided in the layer withno or low light translucence such as to allow light for non-destructive detectionof gas inside the container to enter and exit through said at least one opening;, said method comprising the steps of: - providing a substantially plane blank of a multilayer material comprising asupporting cardboard layer, a weldable layer and an aluminium layer, - arranging, in at least the cardboard and aluminium layer, at least one cut-out, - forming a rounded container body from the blank by bending the blank such as toconnect said first edge with an opposite edge of the blank wherein a joint is formedalong the connected edges, - applying a gas-tight and translucent strip of material in such a way that the opening is covered by the material strip.
    [2] 2. Method according to claim 1,characterized inthat at least a part of the at least one opening is positioned in an upper position of the container.
    [3] 3. Method according to claim 1 or 2,characterized inthat the at least one opening is arranged in a wall section of the container.
    [4] 4. Method according to any of the above claims,characterized inthat the at least one opening has a width/length or diameter in the range 1-40 mm, preferably in the range 2-20 mm. P41207211SE00 2013-12-20
    [5] 5. Method according to any of the above claims,characterized in that the aluminium layer has a thickness in the range 4-40 um.
    [6] 6. Method according to any of the above claims,characterized in that it comprises the step of providing the container with a product and a seal.
    [7] 7. Method according to any of the above claims, wherein the at least one cut-out is arranged at a first edge of the blank.
    [8] 8. Method according to any of the above claims, wherein an opening is formed at the at least one cut-out when forming the rounded container body.
    [9] 9. Method according to any of the above claims, said method further comprises thestep of: - applying an end closure, a bottom, to the inside of the container body by inducingwelding energy and melting the weldable layer.
    [10] 10. Method according to any of the above claims, said method further comprises thestep of: - processing the bottom edge of the container body in an edge shaping unit, theprocessing comprises the steps of folding, heating and curling said edge.
    [11] 11. Method according to any of the above claims, said method further comprises thestep of:- fastening an end closure to the container body by generating an inductive welding energy for melting of the weldable layer.
    [12] 12. Method according to any of the above claims, said method further comprises thestep of: - filling said container - sealing and closing said filled container. P41207211SEOO2013-12-20
    [13] 13. Method according to any of the above claims, said method further comprises thestep of:- welding the material strip to the edges.
    [14] 14. Method according to any of the above claims, said method further comprises thestep of: - transporting a flow of body blanks to a container body forming unit; transporting aflow of container bodies from the container body forming unit to a welding unit; andtransporting a flow of container bodies provided with end closures from the welding unit.
    [15] 15. Container according to any of the above claims, characterized in that the opening is covered with a covering material that has a high translucence tolight and that the covering material is formed of a separate piece of material applied onto the container around the at least one opening.
    [16] 16. Method according to any of the above claims, wherein the gas-tight and translucent piece of material is applied along the joint along the connected edges.
    [17] 17. Method according to any of the claims 1-14, wherein the cut-out is arranged inthe cardboard and the aluminium layers before applying the weldable layer in themultilayer material, wherein the weldable layer is a gas-tight and translucent layerand is applied onto the cardboard and the aluminium layers so as to cover the cut- out/opening.
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1251491A|SE539598C2|2012-12-21|2012-12-21|Method for manufacturing containers with gas-tight opening for non-destructive detection of gas content|SE1251491A| SE539598C2|2012-12-21|2012-12-21|Method for manufacturing containers with gas-tight opening for non-destructive detection of gas content|
    JP2015549319A| JP2016507429A|2012-12-21|2013-12-19|Container for food, method for manufacturing container, method for detecting internal gas, and production system for filling container|
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    PCT/SE2013/051580| WO2014098757A1|2012-12-21|2013-12-19|Container for food products, a method for manufacturing of a container, method for detecting internal gas and a production system for filling containers.|
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