Patent Application
20190367208
This invention relates to an insulated shipping container, and more particularly to a shipping container in which the insulating material is compostable.
A conventional container for shipping temperature sensitive products includes a cardboard box, inside of which is a thermally insulating material. A conventional thermally insulating material is expanded polystyrene (EPS), e.g., Styrofoam. For example, panels of the expanded polystyrene can line the walls of the box, and another packing material, e.g., bubble wrap, can be placed surround and cushion the item being shipped inside the panels. Alternatively, expanded polystyrene can be machined or molded to form a “cooler” into which the item being shipped can be placed—this does not need an external box. In either case, a coolant, e.g., ice, dry ice or a gel pack, is placed in the cavity in the box with the item being shipped.
EPS is relatively inexpensive and easily formed into a variety of shapes, but is not compostable. Consequently, disposing of the material of the container can be a problem.
A container is described that provides for thermal insulation of an item being shipped while the components are still recyclable or compostable.
In one aspect, a thermal insulation article for placement in a shipping container to hold an item includes: a thermally insulating pad shaped to be positioned in a cavity of a rectangular prism shipping container to be adjacent to and cover one or more of a floor, four side walls and cover of the container while leaving an interior space to receive the item, wherein the thermally insulating pad includes: a solid compostable panel formed primarily of grain starch, the panel holding together as a single unit, the panel providing a rectangular plate dimensioned to substantially span whichever of the floor, plurality of side walls or cover that the rectangular plate is adjacent, and a recyclable film formed primarily of paper, the recyclable film forming a pocket enclosing the panel such that when positioned in the cavity of the rectangular prism shipping adjacent a respective floor, side wall or cover, wherein the recyclable film wraps around the panel and provides both an interior surface of the pad facing the interior space and an exterior surface of the thermally insulating pad facing the respective floor, side wall or cover.
Implementations may include one or more of the following features. The recyclable film is coated with a coating of one or more water-retardant materials. A thickness of the coating applied to the recyclable film is between about 0.001 and 0.090 inch. The one or more water-retardant materials include water-resistant materials, water-repellent materials, and water-proof materials. The recyclable film is substantially pure paper. The recyclable film is formed primarily of paper mixed with one or more water-retardant materials. A thickness of the recyclable film is between about 0.001 and 0.090 inch. The one or more water-retardant materials include water-resistant materials, water-repellent materials, and water-proof materials. The paper comprises a wood pulp paper. The recyclable film forms the pocket enclosing the panel without being bonded to the panel. An interior of the pocket is evacuated of air. The panel is slidable within the pocket. The starch comprises corn starch, wheat starch or milled sorghum.
In another aspect, a method of fabricating an insulative insert for placement in a shipping container to hold an item, the method includes: placing a solid compostable panel formed primarily of grain start between two sheets of recyclable film, the panel holding together as a single unit, wherein the two sheets of recyclable film are formed primarily of paper; and heat sealing the two sheets such that the panel is enclosed in a pocket of recyclable film that completely surrounds the panel to form a thermally insulating pad shaped to be positioned in a cavity a rectangular prism shipping container to be adjacent to and cover one or more of a floor, four side walls and cover of the container.
Implementations may include one or more of the following features. The method includes: forming a plurality of thermally insulating pads according to the method described above. The method includes: inserting the plurality of thermally insulating pads into the cavity such that each of the floor, plurality of side walls and cover of a box is adjacent to and covered by a pad from the plurality of thermally insulating pads and the plurality of thermally insulating pads provide an interior space to receive the item, and wherein each rectangular plate is dimensioned to substantially span whichever of the floor, plurality of side walls or cover that the rectangular plate is adjacent.
Potential advantages may include (and are not limited to) one or more of the following.
The insulating material is compostable, and the exterior box is recyclable, so all of the components of the container are easily disposable. The film containing the insulating material is compostable or recyclable, and also easily disposed. If the film is recyclable, e.g., formed of paper (rather than a biodegradable material), then the starch of the insulating material can dissolve easily during the recycling process. This makes the panel compatible with existing paper-recycling techniques, such that the entire pad can be fed into a paper-recycling process without having to separate the paper film from the starch panel.
The film also can be water-retardant such that liquid, e.g., condensation, cannot pass through the film. The water-retardant film can protect a pad or a box from liquid.
The container can be easily assembled, and the insulating pads that fit inside the container can be manufactured at low cost. The insulating pads can provide equivalent thermal insulation to expanded polystyrene, and can be disposed in commercial and residential composting or recycling bins or garbage cans. The container components can be shipped in bulk in an unassembled state with minimal cost increase, and assembly of the container can be performed by the user.
The details of one or more embodiments are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the invention will be apparent from the description and drawings, and from the claims.
Like reference symbols in the various drawings indicate like elements.
Initially, some terminology may be beneficial. “Biodegradable” simply means that a product will eventually disintegrate into to innocuous material. “Recyclable” indicates that a product can be reused or treated in order to be made suitable for reuse. “Compostable” indicates both that a product will decompose quickly, e.g., within 180 days, and that the product will decompose into material that can be used as fertilizer (e.g., per ASTM D6400 or EN 13432). Products that are “biodegradable” need not be (and usually aren't) “compostable.” First, since there is no particular time limit for a “biodegradable” product to disintegrate, it need not decompose quickly. For example, even aluminum cans will biodegrade given several centuries. Moreover, even a biodegradable product that decomposes quickly might not provide a material that is suitable as fertilizer.
Most conventional thermally insulating materials for packaging, e.g., EPS, are not compostable. One technique for using a compostable insulating packaging material is to fill a volume between an inner wall and an outer wall of a box with loose-fill compostable cornstarch foam pellets (e.g., packing “peanuts”) using layered stratification, and then compress each layer of foam pellets in within this volume to compact them. This technique requires either multiple boxes or a specialized box having both inner and outer walls, and also requires specialized machinery for layered stratification compaction of the pellets. The additional or specialized boxes increase the cost. In addition, the loose fill pellets are difficult to compost because they are messy when removed from the box. Moreover, a large amount of pressure, e.g., 25 lbs. or more, needs to be applied to close the top flaps of the box due to the resistance from the pellets.
However, instead of loose-fill foam pellets, a solid compostable panel formed primarily of extruded starch can be enclosed by a film to provide a thermally insulating pad, and this pad can be used as the insulating packaging in the container. The film can be a liner, sheet or similarly thin layer. In some implementations, the film is air-tight.
In some implementations, the film is compostable film. For example, the film can be a bioplastic that meets ASTM D6400 standards.
In some implementations, the film is a recyclable film. For example, the film can be a plastic film, e.g., polyethylene. As another example, the film can be formed primarily of paper.
The paper film can be substantially pure paper, or can be primarily paper but mixed with other materials. The paper can be formed from wood pulp, but the paper can include other plant fiber pulps, e.g., hemp, linen or cotton.
In some implementations, the paper film can be coated with a coating of one or more water-retardant materials such that liquid, e.g., the condensation, cannot pass through the film. The water-retardant materials can include water-resistant, water-repellent, or water-proof materials. For example, water-retardant materials include rubber, polyvinyl chloride, polyurethane, silicon elastomer, fluoropolymers, and wax. In some implementations, the film can be primarily formed of paper mixed with one or more water-retardant materials such that liquid, e.g., the condensation, cannot pass through the film.
In some implementations, a thickness of the paper can be between about 0.001 and 0.090 inch. In addition, a thickness of the coating applied to the paper can be between about 0.001 and 0.090 inch.
The coating can be applied by spraying onto the paper, pouring a liquid onto the paper and curing, or forming a separate layer of the coating and bonding the coating, e.g., by heat, to the paper.
The box 20 can be a rectangular prism, and can includes rectangular side walls 24 that define the interior cavity 22. The bottom of the box may similarly be closed off by one or more flaps (not shown due to the perspective view). The top of the box 20 provides an opening to the interior cavity 22. A cover for the box 20 can be provided by one or more flaps 26 that can be folded inwardly from the side walls 24 to close off the top of the cavity 22. In some implementations, the side walls 24, flaps 26 and bottom of the box are all part of a single integral sheet that is folded into an appropriate shape. Alternatively, the cover for the box 20 can be provided by a separate lid that fits over the side walls 24.
The box 20 is a recyclable material. For example, the box 20 can be a cardboard box, e.g., paper board or corrugated cardboard.
As noted above, the container includes multiple thermally insulating pads 30 that fit inside the box 20. Each pad 30 is formed by sealing a solid recyclable or compostable panel (or multiple solid compostable panels) within a film.
As described above, in some implementations, the film is recyclable or compostable such that the entire pad 30 covered by the film is recyclable or compostable. Thus, a user can easily dispose the pad 30 covered by the film without separating the film from the pad 30.
In some implementations, the film can be coated with a coating of one or more water-retardant materials. The film coated with water-retardant materials can prevent liquid, e.g., the condensation, from passing through the film. For example, where the pad 30 holds goods that contain liquid, e.g., seafood, the film coated with a coating of water-retardant materials prevents liquid from passing through the film such that liquid does not make the paper film, the pad 30, or the box 20 wet.
In some implementations, the pad includes a single panel. Each pad 30 is relatively thin, e.g., about 0.25-4 inch thick, as compared to the length and width of the pad. The thickness of a pad 30 is considered to be along its narrowest dimension, whereas the length and width of the pad 30 are considered to be along the two directions along the primary face, perpendicular to the thickness.
Each panel can be formed primarily of starch, e.g., an extruded starch. The starch can be a grain starch, e.g., corn starch, wheat starch or sorghum (sorghum is also known as milo), a root starch, e.g., potato starch, a vegetable starch, or combinations thereof. Other materials that do not interfere with the compostable nature of the panel, e.g., a softener to improve adhesion of the starch, or a preservative or anti-fungal agent, can be present, but only in small quantities. For example, at least 85%, e.g., at least 90-95%, by weight of the panel is starch. Polyvinyl alcohol can be present, e.g., 5-10% by weight.
Each panel is “solid”, which in this context indicates that the panel holds together as a single unit, rather than being formed of loose-fill pellets. It may be noted that compressed starch pellets would not form a solid part; upon removal of pressure the pellets would disassemble, and increased pressure only fractures or pulverizes the pellets. A solid panel of extruded starch provides significant thermal insulation, while still being compostable.
It is possible for the panels to be a foam material, e.g., to include small pores or voids spread substantially uniformly through the panel. For example, 10-80% of the volume of the panel can be pores or voids, e.g., 25-75%, 25-50%, 10-25%, 50-75%. The maximum size of the pores or voids can be about 1 mm. Although the panel could be a foam material, it is generally incompressible. The density of a panel can be about 0.4-3.5 g/cm3, e.g., 0.6-1.0 g/cm3, 0.8-2.0 g/cm3, 1.0-3.5 g/cm3.
Each panel can be of a uniform homogenous composition. Furthermore, each panel can be a unitary body—that is the body of the panel holds together by itself without adhesives or fasteners to join multiple sections together to form the panel.
The thickness of a panel can be about 0.25-1.0 inches, e.g., 0.25-0.75 inches. Any given panel can have substantially uniform thickness across its primary surface. The surfaces of the panel can be generally flat, or one or more surfaces can be corrugated. Corrugation can increase the effective thickness of the pad, e.g., by a factor of up to 4. In this case, the thickness of the panel can still be uniform, but the panel is shaped with corrugations.
Each panel can include one or more rectangular plates dimensioned to substantially span whichever of the floor, plurality of side walls or cover that the rectangular plate is adjacent. In some implementations, the whole of the panel, when in an unfolded configuration, is also rectangular.
The panels can be formed by an extrusion process. After extrusion, each panel can be cut to the appropriate size. In addition, the edges can optionally be beveled as to provide the beveling of the pads described above. In addition, the panel that provides the collar can be scored, as described below.
In some implementations, the film is compostable, e.g., a bioplastic that meets ASTM D6400 standards. Suitable materials for a compostable film include polymers based on one or more of polylactic acid (PLA), poly(beta-amino) esters (PBAE), polyhydroxyalkanoate (PHA), polycapralactones (PCL), polybutyrate adipate terephthalate (PBAT) polyvinylalcohol (PVA), or ethylene vinyl alcohol (EVOH). For example, a combination of PBAT and PE may be suitable. As another example, a combination of PE and PLA may be suitable. In some implementations, the polymer can be mixed with an organic product, e.g., a starch, such as corn starch.
In some implementations, the film is recyclable and biodegradable. A suitable material for the recyclable film is polyethylene. For example, the film can be a low-density polyethylene (LDPE), a medium-density polyethylene (MDPE) or a high-density polyethylene (HDPE). An advantage of polyethylene is ease of fabrication and good water resistance.
A problem with starch-based insulation is that it dissolves easily in water. If the item being shipped is cold or a coolant is placed in the interior of the container 10, condensation can form on the interior surfaces of the pad 30. However, the film prevents liquid, e.g., the condensation, from reaching the starch panel, thus enabling the starch panel to be usable as a thermal insulator in the container.
To fabricate a pad 30, the starch panel can be placed between two sheets of the film. The edges of the film can be heat-sealed to each other, e.g., along the entire perimeter of the panel, thus enclosing and sealing the panel in a pocket of the film that has only slightly larger dimension than the panel itself. A suitable sealing temperature is above 100° C. Excess film outside the heat seal can be cut away.
In the directions parallel to the primary surface of the panels, the pocket can be up to about 0.5 inches larger on each side than the panel.
Alternatively, the film can be provided in a tubular form. To fabricate a pad 30, the panel is slid inside the tube of the film, and the two open ends of the tube are heat sealed. This forms a pocket in which the panel sits.
In some implementations, the panel sits loose inside the pocket formed by the film. That is, the panel is not bonded or otherwise fixed to the film. Thus, the panel can slide inside the pocket relative to the film. For example, the film can be in sliding contact with the panel. The interior of the pocket can include a small amount of air. In some implementations, the air is vacuumed out before the pocket is sealed.
In some implementations, the panel is affixed to the film. For example, the film can be secured to the panel by heat bonding the film to the panel. As another example, the film can be secured to the panel by an adhesive. The adhesive can be a separate additive, or the adhesive can be provided by applying water to the panel to cause the starch in a portion of the panel at the surface to become tacky such that the film sticks to the panel.
The film can be affixed on both the interior and exterior surface of the panel, or on just one surface of the panel, e.g., just the interior surface or just the exterior surface of the panel. In addition, for each of the interior and exterior surface of the panel, the film can be affixed across the entire surface, or on just a portion of the surface, e.g., a perimeter portion along the edge or a central portion that is spaced away from the edge of the panel.
Other than one or panels, there need not be any other thermally insulating material within the film. For example, unless one of the panels fractures due to applied stress, there are no loose pellets or pieces of other insulating material in the volume enclosed by the film. In some implementations, the pad 30 consists of, i.e., includes only, one or more panels, the film, and optionally some air inside the volume enclosed by the film.
Where both the panel and film are compostable, the entire pad can be disposed of as a unit in a composting bin. Where the panel is compostable and the film are is recyclable, the film can be ripped off the panel manually by the recipient of the package, and then the panel can be disposed of in a composting bin and the film can be disposed of a recycling bin.
In the implementation shown in
The bottom pad 32 has a length and width that match the bottom of the box 20, or are slightly smaller, e.g., by about an ⅛ inch tolerance, so that bottom pad 32 fits snugly at the bottom of the cavity 22 on the bottom of the box 20.
The collar 34 includes a single panel that is folded into four wall members 40. Each wall member 40 has a height (in the vertical direction) about equal to the height of the box 20, less the combined thickness of the top pad 32 and bottom pad 36. Each wall member 40 has a width (in the lateral direction) that matches the adjacent side wall 24 of the box 20, or is slightly smaller, e.g., e.g., by about an ⅛ inch tolerance. Thus, the collar 34 fits snugly into cavity 22 on top of the bottom pad 32, with each wall member 40 adjacent, e.g., in contact with, one of the side walls 24.
The top pad 36 has a length and width that match the top of the box 20, or are slightly smaller, e.g., e.g., by about an ⅛ inch tolerance, so that the perimeter of the top pad 36 can sits on the wall members 40 of the collar 34 and the top pad 36 itself fits snugly at the cavity 22. When the top of the box 20 is closed, e.g., by closing the flaps 26 or placing a lid, the top pad 36 sits adjacent, e.g., in contact with, the top of the box 20.
In some implementations, the surfaces of the pads 30 are basically flat up to and including their edges. “Basically flat” is used to indicate flat at the scale of the thickness of the pad, but still encompasses the possibility of small scale surface texturing. Thus, the lower rim of the collar 34 simply sits basically flat on the perimeter of the top surface of the bottom pad 32, and the perimeter of the top pad 36 simply sits basically flat on the upper rim of the collar 34. Alternatively, the interior surfaces of each pad, i.e., the surface of the pad facing the cavity and further from the box 20, can be beveled at the edge that is adjacent another pad. Thus, the beveled lower rim of the collar 34 sits on the beveled perimeter of the bottom pad 32, and the beveled perimeter of the top pad 36 sits of the beveled upper rim of the collar 34. In this latter case, the outer surface of each wall member 40 can have a height about equal to the height of the box 20.
Referring to
Each score can create a recess 56 that extends across the width W of the panel. The recess 56 extends partially, but not entirely through the thickness of the panel 50. For example, the recess 56 can extend through about 50-75% of the thickness of the panel 50. The scoring can be angled, so the recess has a triangular cross-section.
The reduced thickness of the panel 50 in the scored areas increases the flexibility of the panel so that the panel 50 can be bent at a right angle without breaking. In particular, the panel 50 can be folded inwardly (with the inside surface being the side with the recess 56). This permits the panel 50 to remain as a single unitary part when the collar 34 is folded and placed in the box 20, which can improve thermal insulation by reducing creation of gaps in the insulating material.
These pads 30 are constructed similarly to the pads discussed above for
In particular, referring to
Referring to
Referring to
Together, the resulting two three-sectioned pads 70, 72 cover each of the six sides of the box 20 when inserted in the interior 22 of the box 20.
It should be realized that other configurations are possible for the two three-sectioned pads 70, 72. For example, the first three-sectioned pad could cover the bottom and two opposing sides of the box, and the second three-sectioned pad could cover the top and the other two opposing sides of the box.
These pads 30 are constructed similarly to the pads discussed above for
The example of
Referring to
Referring to
Although
Even further configurations are possible for the pads 30, provided each wall of the box is provided with an individual pad or a section of a pad. For example, there could be three two-sectioned pads, or a three-sectioned pad, two-sectioned pad and an individual pad.
Moreover, there could be just a single pad 100 that fits inside the box 20 and covers all six sides of the box 20. For example,
The example of
The box 20 and pad or pads 30 that form the insulated shipping container 10 can be provided as an unassembled kit, and be assembled by a customer. For example, the box 20 and pads 30 could be shrink-wrapped or otherwise sealed together in packaging.
In any of the various examples discussed above, one or more apertures, e.g., about ⅛ to 5 inches across, can be formed through the film 60 on the side of the pad 30 closer to the box 20, that is the side opposite the opposite the cavity in which the item to be shipped is to be positioned. These apertures are not present on the side facing the cavity in which the item to be shipped is to be positioned; the film 60 on that side of the pad 30 is unbroken. The apertures can prevent pocket from acting like a balloon when the pad is inserted into the box—the film 60 can collapse against primary surfaces of the panels.
In some implementations, a pad includes only one panel in the pocket formed by the film. However, referring to
For a multi-section panel, when the panels 50 are scored, the scoring 56 can be performed by compressing the stack of panels along a line (rather than cutting the panels). As a result, in the scored region some of the panels can be driven partially into the underlying panel.
Where the panels 50 are multi-section panels, sections at each end of the pad can be shorter than the section immediately underneath to compensate for the stacking arrangement such that the ends of panels are substantially aligned. For example, as shown in
In the various implementations discussed above, the individual pads 30 will rest on one another when inserted in the cavity of the box 20. However, the pads 30 are not fixed to each other, e.g., the pads are not secured by adhesive or interlocking components to each other.
In some implementations, the solid compostable panels could be used, but without enclosing or coating the panels with a film.
Optionally, a recyclable interior box 90, e.g., a cardboard box, can fit into a space defined by the interior of the panels 50. In this case, the interior cavity of the interior box 90 provides the space to receive the item and optionally a coolant. The interior box 90 can provide additional thermal insulation, and can protect the panels from water, e.g., condensation caused by coolant. However, as noted above, the item and coolant could be placed into the interior space, without using the interior box.
Each panel 50 can be fabricated as discussed above, e.g., formed primarily of extruded milled sorghum, so as to be compostable. However, the panels are not coated with, enclosed in, or otherwise protected by a film. Rather, the panels 50 are simply inserted into the cavity 22 in the box. One or more of the panels 50 can be a multi-section panel, which is scored as discussed in the various implementations discussed above, and then folded at right angle to provide multiple rectangular plates.
In the implementation shown in
The bottom panel 82 has a length and width that match the bottom of the box 20, or are slightly smaller, e.g., by about an ⅛ inch tolerance, so that bottom panel 82 fits snugly at the bottom of the cavity 22 on the bottom of the box 20.
The collar 84 includes a single panel that is folded into four rectangular plates. The four rectangular plates provide four wall members 40, which are equivalent to the wall members discussed with respect to
The top panel 86 has a length and width that match the top of the box 20, or are slightly smaller, e.g., e.g., by about an ⅛ inch tolerance, so that the perimeter of the top panel 86 can sit on the wall members 40 of the collar 84 and the top panel 86 itself fits snugly at the top of the cavity 22.
Although
Although milled sorghum is discussed above, as noted it may be possible to form the panel out of a grain starch, such as corn starch or wheat starch. However, sorghum is generally superior in that it can provide superior thermal insulation than corn starch. In addition, the particulates of milled sorghum may be more amenable to extrusion.
Referring to
It should be understood that although various terms such as “top”, “bottom”, “vertical” and “lateral” are used, these terms indicate relative positioning of components under the assumption that an opening to the box 20 is at the top, and don't necessarily indicate an orientation relative to gravity; in use, or even during assembly, the container 10 could be on its side or upside down relative to gravity. The term “slightly” indicates no more than about 5%, e.g., no more than 2%.
A number of embodiments have been described. Nevertheless, it will be understood that various modifications may be made without departing from the spirit and scope of the invention. Accordingly, other embodiments are within the scope of the following claims.
