Patent Application
20210214135
The present invention relates to sealed containers for beverages, especially pressurised beverages. Also contemplated are methods of, and machines for, assembling the sealed container
Most fast-food outlets sell carbonated beverages in paper cups with plastic friction-fit lids having an aperture for receipt of a straw. As the drinks are generally consumed in the store, or carried out by a user, the current cups and lids do not have to be leak proof and/or tamper evident. More recently, the large fast-food outlets are providing a home delivery services, which involves meals being specially packaged and delivered to a consumer's home. The transport of the beverages presents a challenge, as the drinks are subjected to a considerable amount of movement when they are transported, which is particularly problematical in the case of carbonated drinks which are pressurised and evolve carbon dioxide when disturbed, shaken and exposed to heat. The use of conventional friction-fit lids is unsuitable as the seal is insufficient to maintain pressure in the cup, meaning that the beverage goes “flat”, and the friction-fit lids detach easily making them entirely unsuitable as a home-delivery solution. Currently, PET bottles with a screw-cap are employed for home delivery of carbonated beverages. The problem with PET bottles is that they are more expensive than in-store cup options, they require refrigeration, they require a lot more storage space, and the introduces a lot of plastic material into the environment.
It is an object of the invention to overcome at least one of the above-referenced problems.
According to a first aspect of the present invention, there is provided a kit for assembling a sealed container containing a beverage, the kit comprising:
a paperboard cup with an open top and a lip circumscribing the open top;
a paperboard sealing lid dimensioned to be welded to the lip of the cup continuously around the lip to seal the paperboard cup; a removable transport cap for sealing engagement with the top of the cup configured to define a headspace chamber between the sealing lid and the transport cap for receipt and retainment of excess fluid exiting the cup and a welding machine comprising a welding head configured for sealing the paperboard cap to the lip of the cup,
wherein in use a beverage is dispensed into the cup, and the welding machine is actuated whereby the welding head welds the paperboard sealing lid to the lip of the cup continuously around the lip to provide the sealed container containing the beverage.
According to another aspect of the present invention, there is provided a sealed container containing a beverage, the sealed container comprising:
a paperboard cup with an open top and a lip circumscribing the open top;
a beverage disposed within the cup;
a paperboard sealing lid welded to the lip of the cup continuously around the lip to seal the paperboard cup, and a removable transport cap for sealing engagement with the top of the cup configured to define a headspace chamber between the sealing lid and the transport cap for receipt and retainment of excess fluid exiting the cup.
In a preferred embodiment of the invention, the beverage is a pressurised beverage.
The paperboard sealing lid typically comprises a pressure release aperture providing limited fluid communication through the lid. In one embodiment, the pressure release aperture has an area of about 0.1 mm2 to about 10 mm2. Optionally, the pressure release aperture is a micron-sized pressure release aperture. Suitably, the micron-sized pressure release aperture has an area of about 0.05 mm2 to about 0.8 mm2.
Suitably, the pressure release aperture is positioned about the centre of the sealing lid.
In one embodiment, the paperboard cup and paperboard sealing lid are formed of the same paperboard material. Preferably, the paperboard material is a paperboard-polyethylene laminate.
In one embodiment, the transport cap comprises a top panel having a raised central portion and the headspace chamber is defined between the sealing lid and the raised central portion.
Preferably, the top panel includes a first annular sealing head configured to abut the paperboard sealing lid when the transport cap is engaged on the top of the cup to peripherally define the headspace chamber.
In a preferred embodiment, the top panel includes a second annular sealing head at the periphery of the top panel.
Preferably, the top panel of the transport cap comprises a raised annular channel defined by the first annular sealing head and the peripheral annular sealing head. Optionally, the top panel of the transport cap comprises an opening, or means for providing an opening, for receipt of a drinking straw.
In one embodiment, the welding machine is a heat-welding machine.
Suitably, the paperboard lid comprises only one pressure release aperture.
The cup and sealing lid preferably comprise paperboard, for example a paperboard laminate material (i.e. a laminate of paperboard and at least one of a polymer or foil layer). However, in other embodiments, other types of material may be used for the cup and lid.
The problems of the prior art are addressed by the provision of paperboard cups for carbonated beverages that are sealed using paperboard lids that are heat welded to the cup. The use of a paperboard lid with a paperboard cup provides for a seal that has been shown to withstand the high pressures that carbonated beverages generate without compromising the integrity of the seal. The kit and container of the invention are especially applicable for use with “ready to consume” and “short shelf-life drinks” such as carbonated beverages sold in fast-food outlets which are pressurised and tends to lose their fizziness rapidly over time. In addition, the Applicant has discovered that the provision of a small aperture in the cap allows venting of a sufficient volume of carbon dioxide to prevent the seal rupturing during transport, without risk of losing significant amounts of beverage or contaminating other food items being delivered at the same time. The micron-sized aperture has also been found to allow the lid be pierced with a plastic drinking straw, as the area of the lid around the micron-sized has been found to become weakened during transport due to beverage wetting the area of the lid around the aperture. Also provided is an outer transport cap comprising an annular sealing head configured to abut the sealing lid when the outer transport cap is engaged with the cup, which serves to retain any beverage that may have leaked through the micron-sized aperture under extreme agitation/disturbance at the centre of the lid and away from the periphery where it is prone to leakage. The paperboard sealing lid creates an airtight seal on the container body which creates a pressurised area between the beverage and the sealing lid inside the vessel/container that holds the liquid in place to prevent leakage out through the micron-sized aperture.
The sealing lid also functions as a tamper evident seal, which serves to provide comfort to the consumer that the drink they are about to consume has not been tampered with or adulterated in any way. Also, the paperboard nature of the sealing lid allows material to be printed on the lid that is visible by the consumer, for example branding, product information, or marketing information or advertising.
In one embodiment, the micron-sized pressure release aperture has an area of about 0.05 to 0.8 mm2. In one embodiment, the micron-sized pressure release aperture has an area of about 0.1 to 0.6 mm2. In one embodiment, the micron-sized pressure release aperture has an area of about 0.2 to 0.4 mm2. In one embodiment, the micron-sized pressure release aperture has an area of about 0.3 mm2.
In one embodiment, the pressure release aperture is positioned at or about the centre of the sealing lid. This is intended to remove any alignment issues when a straw is used to pierce the sealing lid by passing the straw through the aperture in the transport cap. If it was anywhere else on the sealing lid then the sealing cap would have to be specifically aligned to get the straw through the cap in the correct location to hit the aperture on the sealing lid. In one embodiment, the sealing lid comprises a plurality of micron-sized apertures, for example ten, eight, six, four or three. In one embodiment, the sealing lid may comprise only one or two micron-sized apertures.
In one embodiment, the paperboard cup and paperboard sealing lid are formed of the same material.
In one embodiment, the paperboard cup and paperboard sealing lid are formed of a paperboard-polymer laminate. Use of paperboard polymer laminates is preferred, as it has been shown to provide a very secure seal. Laminates of paperboard and other materials may also be employed, for example paperboard-metallic film laminates.
In one embodiment, the paperboard cup and paperboard sealing lid are formed of a paperboard-polyethylene laminate. Other paperboard-polymer may be employed as described below.
In a preferred embodiment, the paperboard sealing lid is heat welded to the lip of the cup. In this embodiment, both the cup and lid will generally include a polymer layer which bond together during heat welding. Heat welding machines are of a suitable size for use in fast-food outlets, and therefore paperboard-polymer cups and sealing lids that can be heat-welded are most suitable for the present invention.
In an embodiment in which the cup and sealing lid comprise a paperboard-metallic film laminate, induction welding may be employed to seal the sealing lid to the cup. Induction welding is described in the literature, for example Davies et al (Induction Heating Handbook, McGraw-Hill, ISBN 0-07-084515-8).
In one embodiment, the cup has a double wall. This facilitates keeping the carbonated beverage cool, which reduces the rate of pressure increase in the cup during transport, and thereby reduces the pressure on the seal.
In one embodiment, the cup and/or sealing lid are each, independently, formed from a biodegradable or compostable material. Examples of biodegradable and compostable paperboard laminate material include bioactive thermoplastic Poly(lactic acid)/polylactic acid/polylactide (PLA).
In one embodiment, the container or kit comprises a removable transport cap configured for friction-fit engagement with the top of the cup on the sealing lid, the transport cap having a top panel and a skirt circumscribing the top panel, in which the top panel includes a first annular sealing head configured to abut the paperboard lid when the transport cap is engaged on the top of the cup. The annular sealing head provides an annular seal between the paperboard sealing lid and transport cap that retains leaked beverage, typically at the centre of the lid away from the periphery.
In one embodiment, the top panel comprises a raised central portion defined by the first annular sealing head configured to provide headspace between the sealing lid and the transport cap that is in fluid communication with the micron-sized aperture. In one embodiment, the raised central portion is generally convex.
In one embodiment, the top portion of the transport cap comprises a peripheral annular sealing head configured to abut a periphery of the paperboard sealing lid when the transport cap is engaged on the top of the cup. The provision of a second (peripheral) sealing head provides a second barrier to beverage leaking out the side of the transport cap.
In one embodiment, the transport cap is formed from a polymer material, for example polyethylene terephthalate (PET). Other materials include polylactide (PLA), High Impact Polystyrene (HIPS), Polypropylene (PP).
In one embodiment, the top portion of the transport cap comprises a raised annular portion defined by the first annular sealing head and the peripheral annular sealing head. This provides a retaining space for beverage that has leaked out of the micron-sized aperture and past the first annular sealing head.
In one embodiment, the top panel of the transport cap comprises an opening for receipt of a drinking straw, or means for making an aperture (for example crossed-slits, or a frangible or weakened portion of the lid).
In one embodiment, the paperboard sealing lid comprises a tab portion that extends beyond the lip of the cup for use in removal of the sealing lid from the cup. In other embodiments, the container is not configured for removal of the sealing lid, and in this embodiment, the user is generally directed to pierce a hole in the sealing lid with a straw or the like. The Applicant has discovered that the use of a micron-sized pressure release aperture at the centre of the lid provides an area of the lid that is weakened due to coming into contact with beverage, and therefore suitable for rupturing with a straw. Thus, in one embodiment, the invention provides a kit of parts comprising a container of the invention and a drinking straw, typically having a piercing tip.
In one embodiment, the paperboard sealing lid comprises a frangible or weakened portion, or aperture, configured for receipt of a drinking spout. This is particularly useful when the beverage is a hot drink, such as coffee or tea, where a drinking straw is not suitable.
In one embodiment, the skirt comprises formations configured to friction-fit over the lip of the cup, to secure the transport cap to the cup. In one embodiment, the formations are spaced apart fluting formations that circumscribe the skirt of the lid. Such formations and friction-fit configurations are well known in the art, for example from U.S. Pat. No. 3,583,596.
In one embodiment, the container comprises a pressurised beverage, for example a carbonated beverage. Examples include sparkling water, cola, orange, lemon and lime, lemonade, beer, tonic water, cider, and sparkling wine. The container of the invention may also be employed for other beverages that generate gas.
The container, or kit, may include a drinking spout configured to penetrate the sealing lid for the purpose of drinking the beverage.
In another aspect, the invention provides a transport cap for a sealed beverage container of the type having an open top, a lip circumscribing the open top, and a sealing lid welded to the lip, the transport cap having a top panel and a skirt circumscribing the top panel, in which the top panel includes a first annular sealing head configured to abut the sealing lid when the transport cap is engaged on the top of the cup.
In one embodiment, the top panel comprises a raised central portion defined by the first annular sealing head configured to provide a chamber for receipt of fluid exiting the cup.
In one embodiment, the top portion of the transport cap comprises a peripheral annular sealing head configured to abut a periphery of the sealing lid when the transport cap is engaged on the top of the cup.
In one embodiment, the top portion of the transport cap comprises a raised annular portion defined by the first annular sealing head and the peripheral annular sealing head.
In one embodiment, the top panel of the transport cap-comprises an opening for receipt of a drinking straw, or means for making an aperture (for example crossed-slits, or a frangible or weakened portion of the lid).
In another aspect, the invention provides a method of preparing a beverage suitable for the ready-to-drink market including home delivery comprising the steps of:
Preferably, the sealing lid optionally comprises a pressure release aperture providing pressure regulation within the cup. Optionally, the pressure release aperture is a micron-sized pressure release aperture.
Preferably, the removable transport cap is configured for sealing engagement with the top of the cup and has a top panel and a skirt circumscribing the top panel, in which the top panel includes a first annular sealing head configured to abut the paperboard sealing lid (5) when the transport cap is engaged on the top of the cup.
In one embodiment, the paperboard sealing lid is heat welded to the lip of the cup.
In one embodiment, the method includes a step of attaching a transport cap according to the invention to the cup on top of the paperboard sealing lid.
In another embodiment, the invention also extends to a method of providing a sealed container containing a beverage, the method comprising the steps of:
providing a paperboard cup with an open top and a lip circumscribing the open top;
dispensing a beverage into the cup;
welding a paperboard sealing lid to the lip of the cup continuously around the lip to seal the paperboard cup; and
attaching a removable transport cap to the top of the cup covering the paperboard sealing lid to define a headspace chamber between the sealing lid and the transport cap for receipt and retainment of fluid exiting the cup.
Preferably, the removable transport cap is configured for sealing engagement with the top of the cup and has a top panel and a skirt circumscribing the top panel, in which the top panel includes a first annular sealing head configured to abut the paperboard sealing lid when the transport cap is engaged on the top of the cup.
In another aspect, the invention provides a welding machine for welding a lid to a cup containing a beverage to seal the beverage in the cup, the welding machine comprising a housing having:
a cup holder having an annual sealing head defining an aperture for receipt of a cup and configured for nested engagement with a lip of the cup when the cup is placed in the cup holder; and
a welding head configured for movement between a first position in which the welding head is spaced apart from the sealing head and a welding position in which the welding head abuts the annular sealing head,
wherein the cup holder comprises guide means for guiding the correct placement of the lid onto the lip of the cup.
In one embodiment, the guide means comprises a plurality of guide arms disposed around the welding head. In one embodiment, guide means comprises at least 3 guide arms, for example 3, 4, 5, or 6.
In one embodiment, each guide arm has a lower part that is substantially vertical and an upper part that outwardly angled.
In one embodiment, the cup holder is configured for horizontal movement between a welding position in which the cup holder is positioned within the housing and the welding head is positioned above the annular sealing head, and a cup mounting position in which the cup holder is presented outside of the housing.
In another aspect, the invention relates to a method of providing a sealed container containing a beverage, the method comprising the steps of:
providing a paperboard cup with an open top and a lip circumscribing the open top; dispensing a beverage into the cup;
welding a paperboard sealing lid to the lip of the cup continuously around the lip to seal the paperboard cup; and
optionally, attaching a removable transport cap to the top of the cup covering the paperboard sealing lid.
In one embodiment, the removable transport cap is configured for sealing engagement with the top of the cup and has a top panel and a skirt circumscribing the top panel, in which the top panel includes a first annular sealing head configured to abut the paperboard sealing lid when the plastic cap is engaged on the top of the cup. Typically, the beverage is a carbonated beverage.
Other aspects and preferred embodiments of the invention are defined and described in the claims set out below.
All publications, patents, patent applications and other references mentioned herein are hereby incorporated by reference in their entireties for all purposes as if each individual publication, patent or patent application were specifically and individually indicated to be incorporated by reference and the content thereof recited in full.
Where used herein and unless specifically indicated otherwise, the following terms are intended to have the following meanings in addition to any broader (or narrower) meanings the terms might enjoy in the art:
Unless otherwise required by context, the use herein of the singular is to be read to include the plural and vice versa. The term “a” or “an” used in relation to an entity is to be read to refer to one or more of that entity. As such, the terms “a” (or “an”), “one or more,” and “at least one” are used interchangeably herein.
As used herein, the term “comprise,” or variations thereof such as “comprises” or “comprising,” are to be read to indicate the inclusion of any recited integer (e.g. a feature, element, characteristic, property, method/process step or limitation) or group of integers (e.g. features, element, characteristics, properties, method/process steps or limitations) but not the exclusion of any other integer or group of integers. Thus, as used herein the term “comprising” is inclusive or open-ended and does not exclude additional, unrecited integers or method/process steps.
As used herein, the term “carbonated beverage” refers to carbonated drinks like cola, orange, lemonade, lemon and lime, water, and other “fizzy drinks”. However, it will be appreciated that the container and methods of the invention may be employed with other pressurised drinks, such as beer, cider, sparkling water and sparkling wine. In one embodiment, the beverage is a “ready to consume” beverage, especially a “short shelf life” beverage.
As used herein, the term “micron-sized pressure release aperture” refers to an aperture that is sufficiently small to keep liquid within the cup when the cup is shaken or falls over, yet allow a sufficient amount of pressure dissipate out of the cup to prevent rupturing of the lid during period of pressure build-up. Generally, an aperture having an area of about 0.05 to about 0.8 mm2 are suitable for this purpose, although this depends on the viscosity of the beverage. In a preferred embodiment, the aperture has an area of about 0.1 to 0.6 mm2, more preferably about 0.2 to about 0.4 mm2.
As used herein, the term “paperboard” as applied to paperboard cups and paperboard sealing lids refers to paperboard materials conventionally used in carbonated beverage cups, including paperboard-polymer laminates and paperboard-foil laminates. In a preferred embodiment, the paperboard laminate is a paperboard-polymer laminate, as these have been found to provide the best seal when adhered together by welding, generally heat welding. These paperboard polymer laminates generally include a layer of paperboard with a barrier layer of polymer, generally a polyethylene polymer, on one or both sides of the paper. Specific examples of paperboard laminates for use in containers of the invention include Stora Enso's Cupforma paperboard, Georgia Pacific's CPH Masterserve cupstock, Mondi Paper Miprotex Barrier Stock. Paperboard formed from any type of paper pulp may be employed, including conventional paperpulp from trees, or paperpulp from bamboo or bagasse.
As used herein, the term “adhered” as applied to the sealing lids and cups refers to the sealing of the lid to the lip of the cup. Various methods of sealing may be employed, for example by means of welding (i.e. induction, heat and ultrasound welding methodologies). Heat welding has been found to provide the most efficient seal between a paperboard sealing lid and paperboard cup, capable of resisting significant pressure build-up in the cup during transport and storage, while providing a material that can be easily ruptured with a straw to allow the beverage be consumed.
As used herein, the term “heat welded” (also referred to as “heat-fused”) refers to a process where the lip is welded to the lip of the cup using heat. Methods of heat welding paperboard laminate materials together are well known to those skilled in the art, and machines for this purpose are commercially available. Welding of the lid to the lip on the cup is facilitated by providing a lip with a flattened upper surface, which increases the surface area of the lip available for welding to the lid.
The invention will now be described with reference to specific Examples. These are merely exemplary and for illustrative purposes only: they are not intended to be limiting in any way to the scope of the monopoly claimed or to the invention described. These examples constitute the best mode currently contemplated for practicing the invention.
Referring to the drawings, and initially to
In more detail, the sealing lid and cup are formed from the same paperboard-polyethylene laminate material, specifically PE coated Paper Cup Stock. Other paperboard-polymer laminates that may be employed include Biodegradable PLA Coated Paper Cup Stock. The cup is generally frusto-connical in shape, has a volume of approximately 450 mls (16 oz), and has an upper section 2A that is double walled and a lower section 2B that is single walled. The lip 4 at the top of the cup extends laterally outwardly of the top of the cup and a top of the lip is flattened to provide an annular landing surface 9 having a width of about 5 mm to which a periphery 10 of the paperboard sealing lid 5 is heat welded.
In use, a carbonated beverage is dispensed into the cup from a drink dispenser to a pre-set volume, and the cup containing the beverage is placed in a heat-welding machine, where a sealing lid is welded to the annular surface of the lip of the cup. This provides a very strong seal that is capable of withstanding pressures in the cup of up to 3 Bar. In addition, the provision of the micron-sized aperture in the sealing lid allows a certain amount of pressure to be vented from the cup during periods of pressure build-up, for example during transport, which helps prevent rupturing of the seal.
Referring to
Referring to
16 oz cups formed of a paperboard-PE laminate material were filled with carbonated beverage and a paperboard-PE laminate sealing lid was heat-sealed to the lip of the cup using a table top, single cavity cup heat sealing semi-automatic machine. A transport cap according to the invention was then placed on the top of the cup and secured in place. The cup was then dropped 4 feet onto a concrete surface without any loss of integrity in the heat weld between the cup and the lid, and without any spillage of beverage.
The same containers as employed in Example 1 were subjected to a pressure test. The first container contained a micron-sized aperture (0.60+/−0.02 mm) in the centre of the paperboard laminate sealing lid 5, and the second container did not contain an aperture in the sealing lid. Steadily increasing pressure was applied to both containers. The seal in the first container remained intact up to a pressure of 2.8+/−0.2 psi, whereupon the application of further pressure failed to register pressure increases in the container, indicating that the pressure was being vented through the micron-sized aperture at elevated pressure levels, preventing loss of integrity in the seal. The seal in the first container remained intact up to a pressure of 3.0+/−0.2 psi, and pressure beyond this value caused the sealed rim of the container to fail. This demonstrates that the pressure release aperture functions to vent gas from the cup at elevated pressure, preventing the pressure rising to a level that causes a loss of integrity in the seal.
The foregoing description details presently preferred embodiments of the present invention. Numerous modifications and variations in practice thereof are expected to occur to those skilled in the art upon consideration of these descriptions. Those modifications and variations are intended to be encompassed within the claims appended hereto.
| Number | Date | Country | Kind |
|---|---|---|---|
| 1808094.5 | May 2018 | GB | national |
| 1903043.6 | Mar 2019 | GB | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2019/062701 | 5/16/2019 | WO | 00 |
