• 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:
    The invention comprises a process for the production of heat-resistant polymer-coated oven board, the resulting oven board, a food tray and food packaging which comprise such board and can be heated in an oven or microwave oven. According to the invention, the coated oven board (1) is prepared by adhering a prefabricated heat-resistant film (4) comprising polyethylene terephthalate (PET) or a derivative thereof, such as glycol-modified PET known as PETG. to cardboard base (2) by extrusion lamination, where an adhesive layer (3) comprising polyamide (PA) is extruded between the heat-resistant film and the cardboard base. To improve the strength and barrier properties, the film (4) may be an extruded multilayer film and / or the film may be stretch oriented to induce crystallization in PET. Fig. 1 015/015
    公开号:SE1400205A1
    申请号:SE1400205
    申请日:2014-04-16
    公开日:2015-10-17
    发明作者:Kimmo Nevalainen；Ville Ribu
    申请人:Stora Enso Oyj；
    IPC主号:
    专利说明:

    2 Bynell 22E804 from DuPont), but such binder resins unfortunately lack sufficient heat resistance to be used for food packaging that is oven safe in both oven types.
    Extruded coating layers of PET do not crystallize, which is a further disadvantage in view of the barrier properties. A thick PET layer that lies on top also has a tendency to crack at the folds and corners when the coated cardboard is transformed into trays and packages.
    The problem is thus to find an improved technique for producing an oven board, which meets the requirement of heat resistance and a sufficient meadow and gas barrier, while avoiding the risk of cracking when the board is converted into trays or containers, and which provides a saving of polymeric material by reduce the required thickness of the coating layer of PET.
    Summary of the Invention According to the invention, the above problems are solved by a new process for producing polymer-coated ovenproof board, in which a heat-resistant film comprising polyethylene terephthalate (PET) or a derivative thereof is adhered to a fiberboard base by extrusion lamination, in which an adhesive layer comprising polyamide (PA) ) is extruded between the heat-resistant film and the paperboard base.
    In the following, any reference to PET generally also includes PET derivatives, which have almost the same thermal resistance properties and oven resistance.
    In the invention, the extruded PA layer acts as a bonding medium to bond the prefabricated solid PET film to the paperboard base. Compared with a coextruded PET layer, the use of a prefabricated film in accordance with the invention provides a number of improved properties.
    Thus, the heat-resistant PET film can be stretch-oriented before being joined with extruded PA in the extrusion lamination step. Stretching induces crystallization and thereby increased strength and improved gas barrier properties.
    The film may have a high degree of crystallization, which also improves the gas barrier and may be provided with applied polymeric or inorganic coatings to give it different functionality or otherwise tailor its properties. The film may, for example, be metallized on its outside, to give the surface of the final product greatly improved gas, fat and aroma barrier properties. Other treatments, such as corona treatment, would improve the bonding of the film to the underlying PA layer.
    The PET film can also have its own multilayer polymer structure, produced by coextrusion. Compared to single layer, a multilayer film generally has an improved mechanical strength. Different PET grades or derivatives can be bonded together by coextrusion in the form of very thin layers, so that the total film thickness can be controlled.
    In particular, the prefabricated PET film allows the basis weight of the polymer to be reduced by up to about 50%. According to the invention, the weight of the PET film layer against the adhesive PA layer 7 may be in the range from 10 to 30 g / m 2, preferably 10 to 20 g / m 2. The weight of the adhesive PA layer may be 3 - 15 g / m 2, preferably 5 - 10 g / m 2.
    In its simplest form, the coating may be a bilayer coating consisting of the extruded adhesive PA layer adhered to the paperboard base and the heat-resistant PET film which is adhered to the PA layer and forms the surface layer of the product.
    Depending on the end use, there may be a polymer coating on only one side of the board base, or the board base may be coated equally on both sides.
    The PA used can be of a special quality to facilitate adhesion to the board base and bond to PET. The use of various PA derivatives, including mixtures of different PA grades and polyimides with substantially similar properties, is encompassed by the invention. Mixtures of PA with other polymers, such as PET, are also included, provided that PA is the major component with a proportion of more than 50% in the mixture. Fillers such as CaCO 3, or oxygen scavengers, can be incorporated into the PA layer. PA grades such as PA6 (Nylon 6) and MXD6 (Nylon MXD6) can be used in the invention. A preferred material is high barrier polyamide (HBPA), marketed under the tradename Grivory HB 5299. HBPA has superior barrier properties over PET and has no tendency to crack or bend. Instead of an extruded single PA layer, the adhesive layer may be a coextruded multilayer structure with layers of PA or PA blend on both sides adjacent to the paperboard base and the prefabricated film. Examples of such structures are PA6 / MXD6, PA6 / HBPA, HPBA / MXD6 and PA6 / PGA / PA6 (PGA = polyglycolic acid). In this way, polymers other than PA, which can withstand oven temperatures and adhere to PA layers during extrusion, can be incorporated as a middle layer in the coextruded structure.
    The PET derivatives encompassed by the invention include in particular glycol-modified polyethylene terephthalate (PETG). The heat-resistant film may include PET and / or PETG. PETG has the advantage of being amorphous, so that it fills in wrinkles and corrugations when the coated board is pressed into troughs and thus allows gas-tight sealing when a trough package is closed with a heat-sealed lid. The film may comprise, or consist of, a plurality of coextruded layers of PET and PETG. In stretch orientation, PET will crystallize and contribute to the strength and barrier, while PETG as a surface layer remains amorphous and ensures excellent bonding at the trough corners and gas-tight seal against the lid. The film may further include an innermost PA layer which is easy to bond tightly to the extruded adhesive PA layer in the extrusion lamination step.
    The polymer-coated paperboard product of the invention, which can withstand oven temperatures and can be obtained by the method described above, is characterized in that the coating comprises an extruded inner layer comprising polyamide (PA) and is adhered directly to a paperboard base, and an outer heat-resistant single or multilayer film comprising polyethylene terephthalate (PET) or a derivative thereof, said film being adhered directly to the inner PA layer, the weight of the inner PA layer being 3 - 15 g / m * and the weight of the outer heat-resistant film being 10 - 30 g / mz.
    The heat-resistant film is preferably a stretch-oriented film. Instead of or in addition to PET, the film may advantageously comprise PETG. The extruded PA layer advantageously comprises MXD6 and / or HBPA.
    The oven safe food tray according to the invention comprises an oven carton as described above, placed so that there are polymer layers placed on top of each other at least on the inside of the tray. The food package according to the invention, which is heat sealed to be oxygen tight and heatable in an oven or microwave oven, comprises an oven carton as described above, so that the superimposed polymer coating layers lie at least on the inside of the carton base in the package.
    Brief Description of the Drawings The invention is illustrated by way of example, with reference to the accompanying drawings, in which Fig. 1 shows the production of a polymer-coated board according to the invention, and Figures 2 to 6 show examples of coated board structures according to the invention.
    Detailed Description Fig. 1 shows a process according to the invention for producing an ovenproof coated packaging board 1, which comprises a board base, as well as an inner coating layer of polyamide (PA) and an outer coating layer of polyethylene terephthalate (PET). The process is an extrusion lamination, in which a layer 3 of molten PA is extruded between a carton base 2 and a prefabricated solid PET film 4 to provide a bond between them. The film 4 may be a single layer or multilayer film and may be stretch oriented prior to incorporation into the carton product 1.
    According to Fig. 1, a web of carton 2 and a web of PET film 4 are drawn from respective rollers 5, 6 to a nip 7 formed by a drive roller 8 and a cooling roller 9 and PA melt 3 are pressed out of a nozzle 10 to meet the board and film webs 2, 4 at the nip 7. The cooling roller 9 cools the molten PA and the rollers 8, 9 compress the layers 2, 3, 4 together to form the finished board product 1.
    Fig. 2 shows the structure of the carton product 1 prepared according to the process of fig. 1 in its simplest form. The carton base 2 has an inner coating layer 3 of PA and an outer coating layer 4 of PET. In the figure, the boundary line 10 between the extruded inner layer 3 and the outer film layer 4 has been highlighted for illustrative purposes only, in practice there is an even adhesive bond between the layers 3, 4. Fig. 3 corresponds to Fig. 2, but shows HBPA and PETG as alternative materials for the extruded and prefabricated film layers 3, 4. It is of course also possible to combine PA with PETG or HDPA with PET for the two layers 3, 4.
    The weight of the carton base 2 can vary in the range from about 120 to 250 g / m 2. Use of a heavier board for the base layer 2 is also possible.
    The carton base 2 may comprise chemical or mechanical pulp or combinations thereof, usually in the form of a multilayer structure common in the art.
    The weight of the extruded adhesive layer 3 can vary in the range from about 3 to 15 g / m 2, preferably 5 to 10 g / m 2. The weight of the outer film layer 4 can vary in the range from about 10 to 30 g / m 2, preferably 10 to 20 g / m 2.
    Fig. 4 shows an embodiment according to the invention where the prefabricated outer film consists of two layers 4 ', 4 "connected to each other. The materials of the film are PET and PETG. PETG has better formability and therefore forms the outer layer 4" in the finished product . The total weight of the film layers 4 ', 4 "is preferably in the above range from about 10 to 30 g / m 2. The material according to Fig. 4 has also been prepared in the manner shown in Fig. 1. The film has been prepared by co-extrusion of PET and PETG layers and solidifying the film, for later use in the process of the present invention.
    Fig. 5 shows a further embodiment according to the invention, where the prefabricated outer film consists of three layers 4 ', 4 ", 4"' connected to each other.
    The materials of the film layers are PETG, PET and PETG, in this order.
    Fig. 6 shows still another embodiment according to the invention, where the prefabricated outer film consists of layers 4 ', 4 "of PA and PETG. PA binds excellently to the extruded inner PA layer 3 and PETG constitutes the preferred material for the outside of the coated carton.
    The coating layers are in principle designed to form the contact layer with food in a food tray or a food container and can withstand heating in an oven or microwave oven. The coated carton can thus be formed into food trays in which there is a coating at least on the inside of the trough which comes into contact with food, or sealed food containers in which there is a coating at least on the inside of the container which comes into contact with food. However, it may be desirable to provide similar coating also on the outside of the trough or container.
    权利要求:
    Claims (14)
    [1]
    A method of polymer-coated oven board, characterized in that a heat-resistant film comprising polyethylene terephthalate (PET) or a derivative thereof is adhered to a board base by extrusion lamination, wherein an adhesive layer comprising polyamide (PA) is extruded between the heat-resistant film and the board base. production of a
    [2]
    Method according to claim 1, characterized in that the coating consists of the extruded adhesive layer adhered to the cardboard base and the heat-resistant film, which is adhered to the extruded adhesive layer and forms a surface layer of the product.
    [3]
    Method according to Claim 1 or 2, characterized in that the cardboard base is coated in the same way on its two sides.
    [4]
    Method according to one of the preceding claims, characterized in that the adhesive layer comprises high-barrier polyamide (HBPA).
    [5]
    Method according to one of the preceding claims, characterized in that the weight of the adhesive layer is 3 to 15 g / m 2, preferably 5 to 10 g / m 2.
    [6]
    Method according to one of the preceding claims, characterized in that the heat-resistant film comprises PET and / or PETG.
    [7]
    A method according to claim 6, characterized in that the heat-resistant film comprises a plurality of coextruded layers of PET and PETG.
    [8]
    Method according to claim 6 or 7, characterized in that the heat-resistant film comprises an innermost PA layer, which is adhered to the extruded adhesive PA layer in the extrusion lamination step.
    [9]
    Method according to one of the preceding claims, characterized in that the weight of the heat-resistant film against the adhesive layer (7) is 10 to 30 g / m 2, preferably 10 to 20 g / m 2.
    [10]
    Method according to one of the preceding claims, characterized in that the heat-resistant film is stretched before the extrusion lamination step.
    [11]
    Polymer-coated oven board (1) obtainable by the method according to any one of the preceding claims, characterized in that the coating 109 comprises an extruded inner layer (3) comprising polyamide (PA) adhered directly to a board base (2) and an outer heat-resistant single or multilayer film (4) comprising polyethylene terephthalate (PET) or a derivative thereof, said film (4) being adhered directly to the inner PA layer (3), the weight of the inner PA layer being 3 15 g / mz and the weight of the outer heat-resistant film is 10 - 30 g / mz.
    [12]
    Oven board according to characterized in that the heat-resistant film (4) comprises a stretch-oriented film. claim 1 1,
    [13]
    Food trays that can be heated in an oven, characterized in that it comprises an oven carton according to claim 11 or 12, so that the polymer layers placed on top of each other are located on the inside of the tray.
    [14]
    Oxygen-tight food package which can be heated in an oven, characterized in that it comprises an oven carton according to claim 11 or 12, so that the polymer layers placed on top of each other are located at least inside the carton base in the package.
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1400205A|SE539559C2|2014-04-16|2014-04-16|Process for making a heat-resistant polymer-coated oven board|SE1400205A| SE539559C2|2014-04-16|2014-04-16|Process for making a heat-resistant polymer-coated oven board|
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    PCT/IB2015/052710| WO2015159217A1|2014-04-16|2015-04-14|A method of producing a heat-resistent polymer-coated oven board, an oven board obtainable by the method, a food tray and a food package|
    US15/304,172| US10632725B2|2014-04-16|2015-04-14|Method of producing a heat-resistant polymer-coated oven board, an oven board obtainable by the method, a food tray and a food package|
    CN201580019454.6A| CN106470841A|2014-04-16|2015-04-14|Manufacture the method for furnace plate of heat resistant polymer coating, furnace plate, food service tray and the packaging for foodstuff that can be obtained by the method|
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    ES15780100T| ES2855988T3|2014-04-16|2015-04-14|A method for producing a heat resistant polymer coated baking sheet, a baking sheet obtainable by the method, a food tray and a food package|
    EP15780100.2A| EP3131756B1|2014-04-16|2015-04-14|A method of producing a heat-resistent polymer-coated oven board, an oven board obtainable by the method, a food tray and a food package|
    CA2943601A| CA2943601A1|2014-04-16|2015-04-14|A method of producing a heat-resistent polymer-coated oven board, an oven board obtainable by the method, a food tray and a food package|
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