Patent Grant
11964792
The present application is a National Stage of International Application No. PCT/EP2019/061172, filed on May 2, 2019, which claims priority to European Patent Application No. 18175332.8, filed on May 31, 2018, the entire contents of which are being incorporated herein by reference.
The present invention relates to containers.
More specifically, the present disclosure relates to lightweight containers having improved stability as well as side-load and top-load resistance and comprising an improved grip portion.
Currently, the market comprises many different shapes and sizes of containers capable of housing fluids. The shape and size of fluid containers can depend, among other things, on the amount of fluid to be housed, the type of fluid to be housed, consumer demands and desired aesthetics. For example, thermoplastic containers for beverages are known in the art. These containers are made of a semi-crystalline polyethylene terephthalate (PET) for good transparency and processability properties. Such plastic containers are typically blow-molded using an injected preform. In order to reduce the price of the plastic raw material which is the cost factor of bottled water, lightweight containers have been proposed. Such lightweight containers contain less plastic and have a reduced wall thickness. For example, at least in the middle-height region of the container body the wall thickness of a lightweight container may be less than or equal to 100 μm. These lightweight containers are, therefore, manufactured with a substantially lower amount of plastic material compared to containers of similar volume content, but made using traditional processes. Accordingly, these containers are cheaper to produce and are also particularly environment-friendly.
Examples of prior art lightweight containers include those described, for example, in International Patent Application WO 2003/033361 A1 or WO 2005/04 7120 A1. These containers are known to be of generally ovoid or spherical shape, which provides for good volume/weight ratios. However, these containers also exhibit several drawbacks in that they are sometimes difficult to store and to pile in pallets for transportation.
Other geometries of lightweight container are known and disclosed from document US 2009/321386 A1 or from document WO 2013/085919 A1.
As presented, there is a big interest in light weighting plastic containers and since decades, the weight of plastic bottles is constantly decreasing due to optimized geometry and reduced processing tolerances.
However, the weight reduction results in challenges as the lightweight container should be able to withstand different environmental factors encountered during manufacturing, shipping and retail shelf stocking or storage and many of the lightweight containers on the market are not always resisting to these environmental factors.
One example of the above mentioned challenge is to avoid local container deformation during transportation leading to a deformed container and thus quality issue and consumer complaints.
In fact, during transportation, the containers may be stacked one on top of the other during packaging, shipping and display. Thus, the containers should be constructed and manufactured so as to withstand the various compressive forces applied by one or more filled containers placed on top of the container without buckling.
Additionally, in lightweight containers, the sides of the container body are very flexible and a risk exists that once the container is open, the contents splash out of the container when grabbed or squeezed by the consumer.
Accordingly, a need exists for a lightweight fluid container having improved structural features as well as desirable aesthetic characteristics. In particular, the proposed container should withstand logistic conditions and especially loads applied during transportation.
In this respects, the invention provides a container having a longitudinal axis comprising at least one undulating bead according to Claim 1.
Hence, in addition to a neck portion, a shoulder portion connected to the neck portion, a body portion comprising a label portion and a grip portion and connected to the shoulder portion via a first connecting portion, in which the label portion and the grip portion being connected together via a second connection portion, and a base portion forming the bottom of the container connected to the body portion via a third connecting portion, the grip portion of the proposed container comprises at least one undulating bead.
The use of at least one undulating bead makes it possible to provide different distribution of stresses when top load and/or compression applies on the container.
Advantageously, the grip portion comprises at least two non-adjoining undulating beads to further participate in the stress distribution.
More particularly, the grip portion comprises a combination of non-adjoining straight and undulating beads.
It is to be noted that the proposed combination of non-adjoining straight and undulating beads improves the distribution of stresses and therefore the overall resistance of the container during transportation.
According to a possible feature, the grip portion comprises at least two spaced undulating beads) and at least one straight bead. Said beads are circular and allow avoiding centralized deformation at the location of the grip portion of the container.
According to one possible feature, the at least undulating beads are separated by at least one straight bead that is not adjoining with the undulating beads.
This allows a further increased resistance of the container.
By way of example in the proposed embodiment, the beads of the grip portion comprise a constant height and a constant base width and a constant top width. Hence with a simple geometry of the bead allowing an easy process it is possible to obtain a container with improved deformation repartition.
In particular, as proposed in the disclosed embodiment, the beads are approximately hemi-spherical. This allows to have an easier handling with smooth gripping.
According to a further feature the beads have the same diameter.
Additionally, the grip portion further comprises at least one rib to further bring some flexibility in the grip portion.
As proposed in the disclosed embodiment, the label portion defines a label portion perimeter that is substantially perpendicular to the longitudinal axis and comprises a plurality of ribs positioned substantially along the perimeter of the label portion. The plurality of ribs bring a certain flexibility to the container.
In the label portion, the plurality of ribs have a constant width and a constant depth.
This is advantageous in that it improves side load resistance.
Furthermore, the grip portion is connected to the label portion via the second connecting portion comprising at least one transitional rib.
The claimed container comprises a volume comprised between 0.20 to 2 L and is a lightweight container.
The invention is further described with reference to the following examples. It will be appreciated that the invention as claimed is not intended to be limited in any way by these examples.
Embodiments of the present invention will now be described, by way of examples, with reference to the accompanying figures in which:
In the following detailed description, reference is made to the accompanying drawings, which form a part hereof. In the drawings, similar symbols and references typically identify similar components, unless context dictates otherwise. The illustrative embodiments described in the detailed description and drawings are not meant to be limiting. Other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter presented here. It will be readily understood that the aspects of the present disclosure, as generally described herein, and illustrated in the figures, may be arranged, substituted, combined, and designed in a wide variety of different configurations, all of which are explicitly contemplated and make part of this disclosure.
As used in this specification, the words “comprises”, “comprising”, and similar words, are not to be interpreted in an exclusive or exhaustive sense. In other words, they are intended to mean including, but not limited to.
Any reference to prior art documents in this specification is not to be considered as an admission that such prior art is widely known or forms part of the common general knowledge in the field.
In particular, disclosed herein are articles, including preforms, bottles and containers, which utilize an optimized quantity of plastic in their construction while maintaining the ease of processing and excellent structural properties associated with current commercial designs.
The present invention will be described in connection with a container, for example, a bottle.
The present disclosure relates to lightweight, stable, load-bearing containers for providing consumable products and, in particular, fluids. The containers are constructed and arranged to be stable and load-bearing to provide a container having not only improved structural features, but also desirable aesthetics.
When speaking about lightweight container, it should be understood containers having a reduced quantity of thermoplastic.
For example, it is considered that a container made of PET is a lightweight container if for a volume of 50 cl, it contains between 6 to 12 g of PET, for a container having a volume of 11, the container will contain between 15 and 19 g of PET.
For a container made by blow molding of a preform, this definition implies that the thickness of the container's walls is reduced. This reduction can lead to containers having wall thickness, in the body portion, below 100 μm.
As described above, lightweight containers for housing liquids are known to have problems transmitting vertical loads efficiently and resisting to side loads. Specifically, during packaging, distribution and retail stocking, containers or bottles can be exposed to large amounts of top-loading and can buckle at any existing points of weakness on the container. Indeed, top-loading, as well as side-loading, can be especially problematic for lightweight containers.
Additionally, due to the generally cylindrical shape of known containers, the sides of the container body are very flexible and a risk exists that once the container is open, the contents splash out of the container when grabbed or squeezed by the consumer.
Further, during packaging, distribution, and retail stocking, containers can be exposed to widely varying temperature and pressure changes, as well as external forces that jostle and shake the container. These types of environmental factors can contribute to rises in internal pressure that affect the overall quality of the product purchased by the consumer of can lead to specific load compression during transportation.
A prior art container 10 is illustrated by
Shoulder portion 14 includes at least one integrally formed shapes 34 oriented substantially vertically on shoulder portion 14.
The body portion 15 comprises a label portion 16 and a grip portion 18, each provided with a structure of reinforcing ribs.
In more detail, Label portion 16 includes several ribs 22 that traverse a circumference of the container and have constant width and depth.
Grip portion 18 presents a reduced diameter with a substantially arc-shaped along a side wall of container 10 that is parallel to a vertical axis of container 10. Grip portion 18 further includes two ribs 24 of constant width and depth, as well as one rib 26 having a first curvature, one rib 28 having a second curvature that is greater than the first curvature, and one rib 30 having a third curvature that is greater than the second curvature. Grip portion 18 is also substantially V-shaped along a side wall of container 10 that is parallel to a vertical axis of container 10, with rib 30 being the vertex of the V-shape. Container 10 further includes an integrally formed shape 32 on an upper, transition portion of the grip portion 18. Although container 10 includes ribs, container 10 may not necessarily be configured to deliver optimized stability or optimized side- and top-load resistance for a lightweight container.
Indeed, transport simulations applying compression test show that the deformations and stresses that apply on the bottle during transportation are mainly concentrated on the rib 30 of grip portion 18 and on the integrally formed shapes 34 oriented substantially vertically on shoulder portion 14. This leads to an important concentration of deformation of the bottle at this specific locations and especially at the location of the grip portion when top load is applied. This will be discussed in more details in connection with
As used herein, “grip portion” may be used interchangeably with “prehension portion” or “grabbing portion”. As used herein, “prehension”, “grabbing” or “handling” means the act of taking hold, seizing or grasping. Accordingly, a prehension portion, or grip portion, of the container may be a portion of the container intended for seizing or grasping by the consumer during handling of the container.
In contrast, Applicants have surprisingly found that the configuration of the containers disclosed herein provides improved stability, improved side-load resistance.
In this regard, the proposed geometry of the container's grip portion allows different distribution of the deformation of the container under compression test.
As shown in
Body portion 45 is connected to the shoulder portion 44 via a first connecting portion 49a and to the base portion 50 via a second connecting portion 49b.
Body portion 45 comprises a label portion 46 and a grip portion 48. Label portion 46 comprises multiple ribs 51. Grip portion 48 comprises a series of circular beads 52, 54 and ribs 56.
Containers of the present disclosure may be configured to house any type of liquid therein. In an embodiment, the containers are configured to house a consumable liquid such as, for example, water, an energy drink, a carbonated drink, tea, coffee, milk, juice, etc. In an embodiment, the containers are configured to house water.
Containers 40 may hold any suitable volume of a liquid such as, for example, from about 200 to 2000 mL including 200 mL, 250 mL, 300 mL, 450 mL, 500 mL, 600 mL, 750 mL, 800 mL, 900 mL, 1000 mL, 1500 mL, 2000 mL, and the like. In an embodiment, containers 40 are configured to hold about 500 mL of a liquid.
Suitable materials for manufacturing containers of the present disclosure can include, for example, polymeric materials. Specifically, materials for manufacturing bottles of the present disclosure can include, but are not limited to, polyethylene (“PE”), low density polyethylene (“LDPE”), high density polyethylene (“HDPE”), polypropylene (“PP”), polyethylene furanoate (“PEF”) or polyethylene terephthalate (“PET”).
Further, the containers of the present disclosure can be manufactured using any suitable manufacturing process such as, for example, conventional extrusion blow molding, stretch blow molding, injection stretch blow molding, and the like.
Mouth 41 may be any size and shape known in the art so long as liquid may be introduced into container 40 and may be poured or otherwise removed from container 40. In an embodiment, mouth 41 may be substantially circular in shape and have a diameter ranging from about 10 mm to about 50 mm, or about 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, or the like. In an embodiment, mouth 41 has a diameter that is about 22 mm.
Neck portion 42 may also have any size and shape known in the art so long as liquid may be introduced into container 40 and may be poured or otherwise removed from container 40. In an embodiment, neck portion 42 is substantially cylindrical in shape having a diameter that corresponds to a diameter of mouth 41. The skilled artisan will appreciate that the shape and size of neck portion 42 are not limited to the shape and size of mouth 41. Neck portion 42 may have a height (from mouth 41 to shoulder portion 44) from about 5 mm to about 45 mm, or about 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, or the like. In an embodiment, neck portion 42 has a height of about 11 mm.
Container 40 can further include an air tight cap (not represented) attached to neck portion 42. The cap can be any type of cap known in the art for use with containers similar to those described herein. The cap may be manufactured from the same or a different type of polymeric material as container 40, and may be attached to container 40 by re-closeable threads, or may be snap-fit, friction-fit, etc. Accordingly, in an embodiment, cap includes internal threads (not shown) that are constructed and arranged to mate with external threads 43 of neck portion 42.
Shoulder portion 44 of container 40 extends from a bottom of neck portion 42 downward to a top of label portion 46. Shoulder portion 44 comprises a shape that is substantially a conical frustum. As used herein, a “conical frustum” means that shoulder portion 44 has a shape that very closely resembles a cone having a top portion (e.g., the apex) of the cone lopped-off. Shoulder portion 44 has a lopped-off apex since shoulder portion 44 tapers into neck portion 42 for functionality of container 40. Further, the “conical frustum” shape also includes a rounded edge 47 wherein shoulder portion 44 curves downward in a substantially vertical orientation to meet label portion 46.
Shoulder portion 44 may have a height (from a bottom of neck portion 42 to a top of label portion 46) ranging from about 30 mm to about 70 mm, or about 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm or the like. In an embodiment, shoulder portion 44 has a height that is about 40 mm.
At a bottom portion (e.g., before label portion 46), shoulder portion 44 may have a diameter ranging from about 50 mm to about 75 mm, or about 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, or the like. In an embodiment, the diameter of a bottom, widest portion of shoulder portion 44 is about 66 mm.
Shoulder portion 44 is connected to label portion 46 via a first connecting portion 49a. Said connecting portion 49a comprises a rib 59a. In the present case, rib 59a of the first connecting portion 49a is a rib having a curved shape as can be seen on
As proposed, rib 59a has a curved shape that provides a spring effect allowing for increase of pressure within the container, which is typical, for example, during storage and transport of lightweight, liquid-filled containers.
Label portion 46 of container 40 includes a plurality of ribs 51 having a constant width (W) and depth (D), as shown more clearly in
Container 40 may include any number of straight and/or constant ribs 51 having any size that provides improved stability and load resistance. Container 40 may include 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 ribs 51. In an embodiment, container 40 includes a plurality of ribs 51. In another embodiment, container 40 includes 2-5 ribs 51, or 3-4 ribs 51, or 3 ribs 51. In the proposed embodiment container 40 includes 3 ribs 51.
For the ribs an internal width (WI) is defined as the width of the rib inside the rib. An outside width (WO) is also defined as the width of the rib at the surface of the container.
Ribs 51 may have an outside width from about 1 to about 5 mm, for from about 2 to about 4 mm, or about 3 mm. In an embodiment, ribs 51 have a width (outside width) that is about 3 mm. Ribs 51 may also have a depth that is from about 1 mm to about 4 mm, or from about 2 to about 3 mm. In the proposed embodiment, ribs 51 have a depth that is about 2 mm.
At a widest point of ribs 51, container 40 may have a diameter ranging from about 40 mm to about 75 mm, or about 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, or the like. In the proposed embodiment, the diameter of container 40 at the widest portion of rib 51 is about 65 mm.
Cross section of ribs 51 may be of different geometry, for example, trapezoidal, triangular or hemi-spherical, but always with the aim of reinforcing the side-load resistance (i.e., lateral resistance of the container) and the top-load resistance (i.e., longitudinal resistance of the container) of the container. In the proposed embodiment, ribs 51 have a trapezoidal geometry.
Additionally, ribs 51 may have a first radius of curvature, or a bend radius, where a substantially vertical side wall of container 40 curves inward to form rib 51 as can be seen in
Ribs 51 may also include a second radius of curvature at a depth (D) of rib 51. This second radius of curvature is indicated by the arrow in combination with the (R2) indicator. The two radii R2 may have similar or different values.
In the present case, the radii of curvature (R1, R2) of ribs 51 have different values, R1 is about 1 mm and R2 is about 0.5 mm.
The geometry of a rib also defined by its opening angle θ as represented in
Label portion 46 is connected to grip portion 48 via a second connecting portion 49b. Second connecting portion 49b comprises a rib 59b. In the present case, rib 59b of the second connecting portion 49b is a rib having a curved shape as can be seen on
As proposed, rib 59b has a curved shape that provide a spring effect allowing for increase of pressure within the container, which is typical, for example, during storage and transport of lightweight, liquid-filled containers.
For rib 59b, values of R1, R2, D, WI, WO and θ may also be defined to characterize the rib, similarly as ribs 51 and 59a.
Second connecting portion 49b has a diameter that is similar to the diameter of label portion 46. The diameter of container 40 at the location of the label portion is about 65 mm. At the lower part of the second connecting portion 49b begins a reduction in the diameter of the container 40 leading to a diameter of the grip portion 48 that is smaller than the diameter of the label portion 46.
Indeed, in the present case grip portion 48 is locally shaped to visually define a prehension portion of the consumer and to locally reduce the diameter of the container 40 to ease gripping.
As can be seen in
In the middle of the grip portion 48, the diameter of the container 40 is reduced to 58.5 mm (minimum diameter of the container).
In the proposed embodiment and as represented in
According to the present disclosure, grip portion 48 comprises two different structural elements to improve the mechanical properties of the proposed lightweight container 40.
The first elements are beads referenced 52, 54 in the figures. Bead may be defined as raised circumferential flange or ring presenting an embossment at the external surface of the container 40.
The second elements are ribs referenced 56 in the figures. Rib have its usual meaning (similar as the one detailed in connecting with the label portion ribs) and may be defined as circular groove extending on the perimeter of the container 40.
The beads 52, 54 and ribs 56 of the grip portion 48 traverse a circumference of the container and are used to provide added hoop strength, rigidity and resistance to bending, leaning, crumbling and/or stretching Grip portion 18 comprises two types of circular beads, straight beads and undulating beads. In the proposed container 40 and as can be seen in the figures, grip portion 48 comprises a combination of non-adjoining straight 52 and undulating 54 beads. Here, said combination comprises two spaced undulating beads 54 separated by one non-adjoining straight bead 52.
Hence, the beads 52, 54 are all separated from each other.
The proposed beads 52, 54 of grip portion 48 comprise a constant height and a constant base width and a constant top width.
The beads 52, 54 are approximately hemi-spherical in cross section. As an alternative, the beads may be of trapezoidal geometry or any other suitable geometry.
Additionally, in the proposed disclosure the beads 52, 54 have the same diameter (d). Said diameter d as well as the hemi-spherical geometry of the beads is represented in
The diameter d of the container of the proposed embodiment is about 5 mm. However, the diameter of the beads may range from 2.5 to 7 mm and the beads 52, 54 may have different diameters.
The beads have the function of rigidifying the grip portion which brings a homogenous distribution of the deformation of the container undergoing compression and load application. This therefore increase the resistance and stability of the container.
As mentioned, grip portion 48 also comprises a rib 56. Said rib 56 is in the form of an undulating rib 56.
As used herein, “undulating” ribs/beads or the “undulation” of ribs/beads means that the ribs move in a wavy, sinuous, curved, or rising and falling manner as the ribs/beads oscillate and traverse a circumference of the present containers. Accordingly, the presently disclosed undulating ribs/beads may be described in terms of a wave. Rib/bead can also be qualified as a swirling rib/bead.
In this regard, undulating ribs/beads may have, for example, a peak-to-peak amplitude (e.g., as measured from crest to adjacent trough) and a wave period (e.g., as measured from crest to crest or from trough to trough). In an embodiment, undulating ribs/beads may have a peak-to-peak amplitude from about 1 mm to about 10 mm, or 2 mm, or 3 mm, or 4 mm, or 5 mm, or 6 mm, or 7 mm, or 8 mm, or 9 mm.
In an embodiment of the present disclosure, undulating rib 56 has a peak-to-peak amplitude of about 7 mm and undulating beads 54 has a peak-to-peak amplitude of about 7 mm. In an embodiment, undulating ribs/beads complete one to three wave periods as undulating ribs traverse a circumference of the container. In an embodiment, undulating ribs complete two wave periods as undulating ribs traverse a circumference of the container.
The proposed combination proposes a given number of undulating and straight beads, however additional undulating and straight beads may be used with the aim of improving the resistance to external loads (side and/or top loads).
The figures show a field plot (a color for every point on the bottle) which displays a representative scalar stress value at every position on the bottle (the stress value is called van Mises stress). The unity is MPa (N/mm2). As can be seen, the two legends for
As can be seen at first sight, the stress concentration and the maximum stress value is much higher for the container of
The higher the stress is on a given portion of the container, the higher the subsequent deformation at this specific portion is because a bottle as a container is almost a linear elastic system for this kind of test.
Hence, as can be seen in
The proposed container solution as represented in
This new distribution of the stress applying on the container allows having a better resistance of the container to top load and compression. This means that small deformations may occur on the container but without leading to a complete deformation or breaking of the container.
This is particularly advantageous as the proposed container is a lightweight container which may be very sensible to loads applying on it.
Container 40 comprises a third connecting portion 49c between the grip portion 18 and the base portion 50. In the proposed disclosure, the third connecting portion 49c comprises a rib 59c having a curved shape as can be seen on
As proposed, rib 59c has a curved shape that provide a spring effect allowing for increase of pressure within the container, which is typical, for example, during storage and transport of lightweight, liquid-filled containers.
The bottom portion of container 40 comprises base portion 50, which may be of any suitable design, including those known in the art and as illustrated. Importantly, however, base portion 50 of the present containers includes a base rib 58, which is an opened trapezoidal rib that helps to ensure good rigidifying structure of the container. Although the present disclosure depicts base portion 50 as having one rib 58, the skilled artisan will appreciate that base portion 50 may include more or less than one rib 58 so long as the container is able to provide the desired stability and improved side- and top-load resistance.
In the present embodiment, rib 58 has constant width (W) and constant depth (D). The width may be about 2.5 to about 6.5 mm and the depth from about 0.5 mm to about 2.5 mm. In the proposed embodiment width of rib 56 is about 5.5 mm and depth of rib 58 is about 1.5 mm.
Additionally, and similarly as for ribs 51 of the label portion 46, rib 58 of base portion 50 may have a first radius of curvature, or a bend radius, where a substantially vertical side wall of container 40 curves inward to form rib 58. This radius of curvature is also present where a bottom portion of rib 58 curves to meet the substantially vertical side wall of container 40 located below rib 58. The two first radius of curvature of rib 56 may be around 0.5 to 3 mm and may be identical or different in terms of value.
Rib 58 may also include a second radius of curvature at a depth (D) of rib 58 where inwardly first curved radius meets a substantially vertical inner portion of rib 58, which is also present where the substantially vertical inner portion of rib 58 curves outward toward first radius located at a bottom of rib 58. The two second radius of curvature of rib 58 may be around 0.5 to 1.5 mm and may be identical or different in terms of value.
Additionally, the containers of the present disclosure can also improve the ease of use and handling by manufacturers, retails and consumers using lightweight containers. In this regard, the structural features described herein provide for improved stability and improved side-loading resistance to help achieve a container that is desirable by consumers.
Although the invention has been described by way of example, it should be appreciated that variations and modifications will be apparent to those skilled in the art and may be made without departing from the scope of the invention as defined in the claims. Furthermore, where known equivalents exist to specific features, such equivalents are incorporated as if specifically referred in this specification.
| Number | Date | Country | Kind |
|---|---|---|---|
| 18175332 | May 2018 | EP | regional |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2019/061172 | 5/2/2019 | WO |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2019/228741 | 12/5/2019 | WO | A |
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