Patent Application
20110284493
1. Field of the Invention
This invention relates to blow molded plastic containers, and particularly those containers having an upper dome or bell portion that is designed to be gripped by a consumer during use.
2. Description of the Related Technology
Many products that were previously packaged using glass containers are now being supplied in plastic containers, such as containers that are fabricated from polyesters such as polyethylene terephthalate (PET).
PET containers are typically manufactured using the stretch blow molding process. This involves the use of a preform that is injection molded into a shape that facilitates distribution of the plastic material within the preform into the desired final shape of the container. The preform is first heated and then is longitudinally stretched and subsequently inflated within a mold cavity so that it assumes the desired final shape of the container. As the preform is inflated, it takes on the shape of the mold cavity. The polymer solidifies upon contacting the cooler surface of the mold, and the finished hollow container is subsequently ejected from the mold.
The use of blow molded plastic containers for the purpose of packaging liquids that are processed by the hot fill and/or pasteurization processes has been known for some time. The hot fill process involves filling the containers while the liquid product is at an elevated temperature, typically 68° C. to 96° C. (155° F.-205° F.) and usually about 85° C. (185° F.) in order to sterilize the container at the time of filling. Containers that are designed to withstand the hot fill process are known as “hot fill” or “heat set” containers. Such containers are typically designed with sidewalls that include one or more recessed vacuum panels that are designed to flex due to the temperature changes and consequent volumetric expansion and contraction that takes place during processing. In many instances, the recessed vacuum panels also provide convenient handholds that facilitate gripping of the container by consumers.
One type of conventional container design includes a lower portion and an upper dome or bell portion that is separated from the lower portion by a waist. In the past, it has been found to be difficult as a matter of design to provide effective gripping recesses within a dome or bell portion while maintaining material costs at an economically acceptable level, because the force created by a consumer while gripping the container has the tendency to collapse portions of the dome or bell portion. A need exists for an improved plastic container having an upper dome or bell portion that is designed to be gripped by a consumer during use, which provides improved optimization of structural stability and material costs with respect to conventional designs.
Accordingly, it is an object of the invention to provide an improved plastic container having an upper dome or bell portion that is designed to be gripped by a consumer during use, which provides improved optimization of structural stability and material costs with respect to conventional designs.
In order to achieve the above and other objects of the invention, a plastic container according to a first aspect of the invention includes a finish and a main body having a sidewall. The main body has a lower portion and an upper dome that is separated from the lower portion by a waist. The upper dome includes an upper brow portion having a first maximum width, and the upper brow portion has a concave recess defined therein. A gripping recess is defined in the sidewall beneath the upper brow portion and has a second minimum width that is less than the first maximum width. A portion of the sidewall that defines the gripping recess also has a U-shaped groove defined therein.
A plastic container according to a second aspect of the invention includes a finish; and a main body having a sidewall. The main body has a lower portion and an upper dome that is separated from the lower portion by a waist. The upper dome includes an upper brow portion having a first maximum width, and the upper brow portion has a concave recess defined therein. A gripping recess is defined in the sidewall beneath the upper brow portion and has a second minimum width that is less than the first maximum width. A portion of the sidewall that defines the gripping recess also has a substantially vertically oriented reinforcing element defined therein.
A plastic container according to a third aspect of the invention includes a finish; and a main body having a sidewall. The main body has a lower portion and an upper dome that is separated from the lower portion by a waist. The upper dome includes an upper brow portion having a first maximum width. A gripping recess is defined in the sidewall beneath the upper brow portion and has a second minimum width that is less than the first maximum width. A portion of the sidewall that defines the gripping recess also has a U-shaped groove defined therein and a substantially vertically oriented reinforcing element defined therein.
These and various other advantages and features of novelty that characterize the invention are pointed out with particularity in the claims annexed hereto and forming a part hereof. However, for a better understanding of the invention, its advantages, and the objects obtained by its use, reference should be made to the drawings which form a further part hereof, and to the accompanying descriptive matter, in which there is illustrated and described a preferred embodiment of the invention.
Referring now to the drawings, wherein like reference numerals designate corresponding structure throughout the views, and referring in particular to
In the preferred embodiment that is shown in
As
The main body portion 18 also preferably includes an upper dome or bell 30 that is separated from the lower portion 20 by a waist 32. In the illustrated embodiment, the waist 32 is embodied as a peripheral inwardly extending groove, but an alternative embodiments it may be more or less pronounced or it may simply be an interface between the upper dome 30 and the lower portion 20.
The upper dome 30 preferably includes an upper brow portion 34 that is shaped so as to substantially approximate a rounded rectangle when viewed in top plan, as is shown in
In the preferred embodiment, a concave recess 46 is defined in each of the lateral sides 42, 44 of the upper brow portion 34. Alternatively, the concave recess 46 may be defined in only one of the lateral sides 42, 44. Preferably, each concave recess 46 is substantially centered vertically and horizontally with respect to the lateral side 42, 44 in which it is defined. Each of the concave recesses 46 preferably intersects a horizontal plane that also intersects portions of the upper brow portion 34 that define the first maximum width WMAX. The presence of the concave recesses 46 provides significant additional structural stability to the upper brow portion 34 when the container 10 is gripped by a consumer during use. Preferably, both of the concave recesses 46 have a radius of curvature RC, and a ratio of RC/WMAX is preferably within a range of about 0.95 to about 0.99.
Directly beneath the lateral sides 42, 44 of the upper brow portion 34 are defined first gripping recesses 48 for facilitating gripping of the container 10 by a consumer. In the preferred embodiment, the structural stability of each of the gripping recesses 48 is enhanced by the presence of an inverted U-shaped groove 50, as may best be seen in
The upper dome 30 also preferably includes second gripping recesses 52 that are defined directly beneath the front and rear sides 38, 40 of the upper brow portion 34. The portions of the sidewall 19 defining the second gripping recesses 52 each have a U-shaped groove 54 defined therein for providing additional structural stability when the container 10 is gripped by a consumer. In the preferred embodiment, the uppermost and lowermost extents of the U-shaped groove 54 are both substantially the same as that of the U-shaped groove 50 that is defined in the portion of the sidewall 19 that defines the first gripping recesses 48. The U-shaped groove 54 is also preferably substantially centered with respect to both the second gripping recess 52 and the front or rear side 38, 40 of the upper brow portion 34 that is positioned directly above it.
The portion of the sidewall 19 that defines each of the first gripping recesses 48 is also preferably provided with a vertically oriented reinforcing element 62 that is separate from the inverted U-shaped groove 50. In the preferred embodiment, the vertically oriented reinforcing element 62 includes a vertically oriented recessed band or groove having a substantially flat bottom surface 64 and a pair of edge portions 66 connecting the substantially flat bottom surface 64 to the rest of the sidewall 19 that defines the first gripping recesses 48, as is shown in cross-section in
The presence of the vertically oriented reinforcing element 62 provides significant additional structural reinforcement against deformation of the portion of the sidewall 19 that defines the first gripping recesses 48, acting in conjunction with the structural reinforcement that is provided by the U-shaped groove 50 and by the presence of the concave recess 46.
In the embodiment shown in
In the preferred embodiment, the vertically oriented reinforcing element 62 extends substantially all the way to the bottom of the upper dome 30 to the waist 32. The vertically oriented reinforcing element is also preferably substantially centered when viewed in side elevation with respect to the downwardly extending legs 58, 60 of the U-shaped groove 50.
It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
