The present disclosure generally relates to packaging materials and systems and methods for making packaging materials that may include a fibrous base material and a film formed on the base material and may be formed into constructs such as blanks, cartons, press-formed constructs, or the like.
In general, one aspect of the disclosure is directed to a method for forming a resultant material. The method can comprise obtaining a base material comprising a fibrous material with a plurality of fiber portions extending from a face of the base material. The method further can comprise treating at least the face of the base material, the treating at least the face comprising applying heat along at least a portion of the face with a treatment unit to at least partially remove the plurality of fiber portions extending from the face. Also, in some embodiments, the method can comprise applying a coating layer to the face of the base material.
In another aspect, the disclosure is generally directed to a system for forming a resultant material. The system can comprise a treatment unit applying heat to at least a portion of a face of a base material, the base material having a plurality of fiber portions extending from the face, and the treatment unit at least partially removing the plurality of fiber portions. In some embodiments, the system further can comprise a coating apparatus applying a coating to the face of the base material.
In another aspect, the disclosure is generally directed to a method for forming a resultant material. The method can comprise obtaining a base material and applying a coating layer to the base material to form an initial coated material, the coating layer extending along a surface of the initial coated material. The method further can comprise treating at least a portion of the initial coated material to form the resultant material. The treating at least a portion of the initial coated material comprising applying localized heat to at least a portion of the coating layer along the surface of the initial coated material with a treatment unit to at least partially modify the coating layer.
In another aspect, the disclosure is generally directed to a system for forming a resultant material. The system can comprise a coating apparatus applying a coating layer to a base material to form an initial coated material with the coating layer extending along a surface of the initial coated material. The system further can comprise a treatment unit applying localized heat to at least a portion of the coating layer along the surface of the initial coated material for at least partially modifying the coating layer.
Those skilled in the art will appreciate the above stated advantages and other advantages and benefits of various additional embodiments reading the following detailed description of the embodiments with reference to the below-listed drawing figures.
According to common practice, the various features of the drawings discussed below are not necessarily drawn to scale. Dimensions of various features and elements in the drawings may be expanded or reduced to more clearly illustrate the embodiments of the disclosure. The drawings are schematic and exemplary only, and should not be construed as limiting the invention.
Corresponding parts are designated by corresponding reference numbers throughout the drawings.
Exemplary embodiments of this disclosure are described below and illustrated in the accompanying figures, in which like numerals refer to like parts throughout the several views. The embodiments described provide examples and should not be interpreted as limiting the scope of the invention. Other embodiments, and modifications and improvements of the described embodiments, will occur to those skilled in the art and all such other embodiments, modifications and improvements are within the scope of the invention.
One aspect of this disclosure is the provision of systems and methods for providing a web of packaging material, wherein the packaging material may be formed into a beverage cup, a tray, a bowl, a carton, and/or another suitable container or construct for holding or packaging one or more articles (e.g., for storage, transporting, heating, cooking, consuming food products and/or beverages, and/or other suitable uses). In one example, the packaging material can be formed into a construct for use in cooking and/or reheating food in a microwave oven and can include microwave transparent and/or microwave energy interactive materials.
In the illustrated embodiment, the face 23a of the base material 21 can be uncoated and unlaminated, and a plurality of fiber portions 25 (e.g., “stray fibers”) can extend from the face 23a. In one embodiment, the base material 21 can include fibers that mostly extend within the interior 27 of the base material 21 while portions (e.g., end portions) of some portion of the fibers can extend at least partially away from the interior of the base material 21 at one or more faces/surfaces of the base material 21. While the fiber portions 25 are shown as extending upwardly from the face 23a of the base material 21 in the schematic view of
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In exemplary embodiments, the system 20 schematically shown in
The system 20 and the features thereof could be otherwise shaped, arranged, configured, and/or positioned without departing from the disclosure. For example, while one treatment unit 31 is shown in
In embodiments, the coating layer 33 can be a sealing layer (e.g., to waterproof the material, to form a water-resistant material, to form a grease barrier, etc.). In exemplary embodiments, the coating layer 33 can be polyethylene (PE) or another suitable petroleum-based polymer or could be a PE-replacement polymer that is not petroleum-based and/or that breaks down more easily after use (e.g., that is commercially compostable, is home compostable, and/or readily breaks down in marine and/or landfill environments). For example, the polymer could be polylactic acid (PLA), a polyhydroxyalkanoate (PHA), and/or polybutylene succinate (PBS). PLA is a bio-derived extrusion polymer that can be viscous, and its relatively high viscosity can help prevent fiber portions from protruding through the coating layer 33. However, the treatment of the base layer 21 to remove the stray fibers as described above can help further reduce fibers from the base layer 21 protruding in the coating layer. PBS is also an extrusion polymer and can be petroleum-based and/or bio-derived. PBS may be desirable in some embodiments due to its compostability in home compost systems. PHA is a bio-derived polymer that is highly degradable (e.g., relative to other polymers), is highly compostable (e.g., relative to other polymers), and has marine degradation characteristics.
In an exemplary embodiment, PHA can be applied to the face 23a/23b in an emulsion (e.g., a water-based emulsion) and can be dried and/or annealed to remove the water and leave the PHA coating on the face of the base layer 21. For example, a water-based emulsion including PHA (or another suitable polymer or any other suitable coating material) can be applied to the base layer 21 (e.g., by a coating roller, spray nozzles, and/or other suitable apparatus). Subsequently, the water-based emulsion can be annealed and/or otherwise modified to form the coating on the base layer. In embodiments, the water-based emulsion can be at least partially annealed by flame annealing with a flame treatment unit 31 (e.g., positioned downstream from the coating apparatus 36), wherein the localized heat from the flame treatment unit 31 can at least partially dry the water-based emulsion and cause the PHA or other polymer to coalesce into the coating. Alternatively, or in addition, the water-based emulsion can be annealed and/or otherwise modified with other suitable drying and/or heating apparatus and/or operations. In some embodiments, flame annealing the water-based emulsion with the flame treatment unit 31 can facilitate the formation of a more uniform coating surface from the polymer in the emulsion than other systems that do not include applying localized heat with a flame treatment unit 31. In embodiments, a PHA emulsion or other water based material may less viscous than other materials and may not be as good at knocking down stray fibers (e.g., PE, which can be more viscous, can better cover the stray fibers and prevent the stray fibers from extending through the PE coating). Accordingly, water-based materials and other lower viscosity materials can particularly benefit from removing stray fibers as described above.
In some embodiments, dive-in of water-based materials and/or other less viscous materials into the fibrous material of the base layer 21 can have a number of effects on the fibrous material (e.g., dive-in can result in a less suitable coating, can cause fibers to extend from the face 23a, can cause swelling of the fibrous material, etc.). In some embodiments, dive-in can be reduced or mitigated by adding sizing agents and/or other hydrophobic materials to the fibrous material. In an exemplary embodiment, the coating material (e.g., a PHA emulsion) can be applied to the face 23a/23b twice: a first application can be result in dive-in and can be followed by the flame treatment to remove the fiber portions 25, and then a second application of the coating material can form the coating layer 33. In embodiments, the coating material that was partially absorbed in the first application can help prevent dive-in in the second application.
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In embodiments, the surface 139a can be heated to sufficient temperatures (e.g., including the temperatures described above) by the flame treatment unit 31 to vaporize the fiber portions 25 and to cause the coating layer 33 to become malleable/flowable and subsequently coalesce and smooth itself out. For example, a coating layer 33 comprising EVA could be heated to about 150° F. to about 175° F. (about 65° C. to about 80° C.) for malleability and coalescence. In another example, a coating layer 33 comprising bio-polymers could be heated to about 300° F. to about 350° F. (about 150° C. to about 175° C.) for malleability and coalescence.
In some embodiments, additional coating material and/or coating layers can be added to the coating layer 33 after treating the surface 139a with the flame treatment unit 31 to form the resultant surface 139b. As schematically shown in
The resultant coated materials formed in the embodiments described above can provide packaging materials with barrier properties using materials with desirable traits (e.g., renewable materials, compostable materials, etc.) and can use the materials efficiently while reducing and/or eliminating channels or pathways for oil, grease, water, and/or other materials to pass through the barrier layer. For example, the methods and systems of the above embodiments can reduce and/or eliminate stray fibers that can extend through the barrier layer and can wick fluids through the barrier layer. In alternative methods or systems that lack the flame treatment described above with respect to the first and second exemplary embodiments, a larger amount of coating material may be used to form the coating layer 33 and/or multiple coating layers can be added to help ensure that stray fibers (e.g., fiber portions 25) are adequately covered by the coating to form a seal or at least partially form a seal. However, such methods/systems are less efficient with respect to the use of the coating material and can be costlier. Accordingly, the removal of the fiber portions 25 by the flame treatment described with respect to the exemplary first and second embodiments can be more efficient in the use of the coating material and can save on costs.
In an exemplary embodiment, the opposing surface of the resultant coated materials could be coated in a similar or identical manner as described above in the exemplary embodiments and/or could be otherwise coated, laminated, etc. or could be left uncovered.
Any of the features of the various embodiments of the disclosure can be combined with, replaced by, or otherwise configured with other features of other embodiments of the disclosure without departing from the scope of this disclosure
The foregoing description of the disclosure illustrates and describes various exemplary embodiments. Various additions, modifications, changes, etc., could be made to the exemplary embodiments without departing from the spirit and scope of the disclosure. It is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense. Additionally, the disclosure shows and describes only selected embodiments of the disclosure, but the disclosure is capable of use in various other combinations, modifications, and environments and is capable of changes or modifications within the scope of the inventive concept as expressed herein, commensurate with the above teachings, and/or within the skill or knowledge of the relevant art. Furthermore, certain features and characteristics of each embodiment may be selectively interchanged and applied to other illustrated and non-illustrated embodiments of the disclosure.
This application claims the benefit of U.S. Provisional Patent Application No. 63/194,418, filed on May 28, 2021. The disclosure of U.S. Provisional Patent Application No. 63/194,418, which was filed on May 28, 2021, is hereby incorporated by reference for all purposes as if presented herein in its entirety.
Number | Date | Country | |
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63194418 | May 2021 | US |