Patent Abstract:
A plastic blow molded bottle or wide mouth jar useful in containing hot-filled beverages or food products. The container has a multi-sided sidewall which is capable of accommodating vacuum associated with hot filling, capping and cooling of the container, which is reinforced to resist unwanted deformation, and which enables a label to be aesthetically displayed on the container sidewall. To this end, the sidewall comprises a plurality of panels which include outwardly bowed arcuate sections, as-formed, which flatten to accommodate induced vacuum. Thus, a label can be supported on the sidewall with very few voids, or like sunken areas, behind the label to ensure that the label is prominently displayed on the aesthetically appealing novel container configuration.

Full Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
   This application is a continuation of application Ser. No. 10/135,315, filed Apr. 29, 2002, now abandoned, which claims the benefit of U.S. Provisional Patent Application No. 60/301,200 filed Jun. 27, 2001. 

   FIELD OF THE INVENTION 
   The present invention relates to a plastic blow molded bottle or wide mouth jar useful in containing hot-filled beverages or food products, and more particulary, the present invention relates to a container having a multi-sided sidewall which is reinforced to resist unwanted deformation, which enables a label to be aesthetically displayed on the container sidewall, and which is capable of accommodating vacuum associated with hot filling, capping and cooling of the container. 
   BACKGROUND OF THE INVENTION 
   Hot-fillable, blow-molded plastic containers are well known in the art. The problems associated with accommodating vacuum deformations associated with hot filling, capping and cooling, and their solutions are also well known. Typically, so-called vacuum flex panels are formed as relatively large indented panels in the sidewall of containers and accommodate the vacuum that develops in the containers as a result of hot fill processing. Examples of cylindrical containers having indented flex panels are disclosed in U.S. Pat. No. 5,762,221 issued to Tobias et al.; U.S. Pat. No. D.402,563 issued to Prevot et el.; U.S. Pat. No. D.366,831 issued to Semersky et al.; and U.S. Pat. No. D.366,416 issued to Semersky. 
   Hot-fillable blow-molded containers having multi-sided sidewall configurations with indented vacuum flex panels are disclosed, for example, by U.S. Pat. No. 5,178,290 issued to Ota et al. and U.S. Pat. No. 5,238,129 issued to Ota. In particular, FIGS. 7-8 of the Ota &#39;290 patent and FIGS. 5-8 of the Ota &#39;129 patent illustrate and disclose hexagonal and octagonal container sidewall configurations which have indented flex panels. 
   Hot-fillable, multi-sided containers have also been provided with a series of walls which are formed planar and which bow, flex, or warp inwardly in response to induced vacuum. Thus, the resulting shape of each panel of such hot-filled, capped and cooled containers is concave, or inwardly bowed, thereby providing the sidewall with an undulating shape in plan. Examples of such containers are disclosed by U.S. Pat. No. 4,749,092 issued to Sugiura et al. and U.S. Pat. No. 4,497,855 issued to Agrawal et al. For instance, see FIGS. 2 and 5 of the &#39;092 Sugiura patent and FIG. 7 of the Agrawal &#39;855 patent. U.S. Pat. No. 3,923,178 issued to Welker, III discloses another multi-sided container having a plurality of sidewall panels which, as-formed, are planar and which are designed to flex inwardly. For instance, see FIG. 7 of the Welker, III &#39;178 patent. 
   Other related container designs are disclosed by U.S. Pat. No. 4,946,053 issued to Conrad which discloses an ovalized label panel for a hot-fillable bottle having a circular footprint; U.S. Pat. No. 5,908,127 issued to Weick et al. which discloses an ovalized or “rounded-off” rectangular sidewall of a hot-fillable bottle having front and rear outwardly bowed panels; and U.S. Pat. No. 5,690,244 issued to Darr which discloses a paneled sidewall of a jar having a circular footprint. Also see the container configurations disclosed in U.S. Pat. No. 4,818,575 issued to Hirata et al.; U.S. Pat. No. 5,866,419 issued to Meder; U.S. Pat. No. D.189,372 issued to Adell; U.S. Pat. No. D.402,896 issued to Conrad; U.S. Pat. No. D.318,422 issued to Rumney; U.S. Pat. No. D.418,760 issued to Blank; and U.S. Pat. No. D.419,886 issued to Gans. 
   A problem experienced with hot-fillable containers having flex panels, particularly indented or concave flex panels, is that voids are created within the label mounting region behind the labels. Voids behind a label can prevent the label from being prominently displayed on the container sidewall and can provide areas on the label which are prone to tearing, undesirable stretching, or the like. In addition, the use of certain labels, such as shrink wrap labels, can result in the labels extending into, or shrinking within, the voids which also negatively effects container aesthetics. 
   Another problem experienced with hot-fillable containers is the occurrence of creases, dents or like deformations in the sidewalls of the containers which damage, weaken, and/or detract from the aesthetics of the container. Such deformations can result, for instance, due to line pressure experienced during transferring, filling, capping and packing operations. To this end, adjacent containers in such operations can become tightly engaged, particularly adjacent the base and lower bumper areas of the containers, thereby causing at least selected ones of the containers from being dented or provided with undesirable crease marks. More specifically, multi-sided containers typically experience such deformations adjacent the vertical post structures adjacent the base of the containers. 
   A still further problem relates to the occurrence of creases, dents or like deformations in the sidewalls of the containers experienced as a result of shipping and handling of the containers due to inadequate top loading or drop capability. To this end, creases or dents can result in containers located in bottom rows of containers on which many other rows of containers are stacked during shipping. In addition, forces exerted on the containers during loading and unloading of the stacked containers can also cause creases and dents. Multi-sided containers are particularly prone to such deformation along post structures adjacent the base of the containers along an area of contact of the containers with adjacent containers in the stack. 
   Although various ones of the above referenced containers may function satisfactorily for their intended purposes, there is a need for a hot-fillable, blow-molded container having a flex panel and sidewall structure which permits a label to be completely wrapped around the container sidewall and prominently displayed thereon and which limits voids behind the label. In addition, preferably the sidewall structure should be multi-sided and should be reinforced to resist creasing, denting and the occurrence of like deformations. Further, the container should provide improved top loading capability and improved drop testing results. Still further, the container should be capable of efficient and relatively inexpensive manufacture and should be capable of being made from a minimum of thermoplastic material. 
   OBJECTS OF THE INVENTION 
   With the foregoing in mind, a primary object of the present invention is to provide a blow-molded plastic bottle and/or wide mouth jar having a multi-sided sidewall capable of accommodating induced vacuum within a hot-filled, capped and cooled container. 
   Another object of the present invention is to provide a hot-fillable, multi-sided container providing a label mounting area which encompasses flex panel structures on the sidewall and which can prominently support and display a label, including shrink wrap labels and the like. 
   A further object is to provide a hot-fillable, multi-sided, plastic, blow-molded container which provides a novel visual appearance and which has enhanced structural integrity. 
   SUMMARY OF THE INVENTION 
   More specifically, the present invention provides a hot-fillable plastic container provided by a blow molded plastic container body having a circular base, a sidewall, a circular lower bumper between the base and sidewall, and a dome having an upstanding finish. The sidewall has a plurality of panels positioned circumferentially in a side-by-side relationship about the sidewall thereby forming a multi-sided sidewall structure. Each adjacent pair of panels interconnect at an obtuse angle and form a vertically-extending post structure which extends continuously through the multi-sided sidewall structure. 
   Each panel, as-formed, has a section which is arcuate in a plane extending perpendicular to an imaginary central axis extending longitudinally through the container. The arcuate sections provide the panel with a slightly outward bow and are formed having a predetermined radius of curvature within a predetermined range of radius of curvatures. Preferably, the radius of curvature of the panels varies along the length of the panels. This structure permits the arcuate sections of the panels to flex inwardly for accommodating induced vacuum created when the container is hot-filled, capped and cooled. 
   Each panel also has an inset circumferentially-extending reinforcement area adjacent the lower bumper of the container. Each inset area extends between an adjacent pair of the post structures and terminates a spaced distance from the post structures to reinforce and strengthen the circular lower bumper and post structures. This structure enables the container to resist creasing, denting and like deformation, and enhances top loading capability and drop testing results. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The foregoing and other objects, features and advantages of the present invention should become apparent from the following description when taken in conjunction with the accompanying drawings, in which: 
       FIG. 1  is a perspective view of a container embodying the present invention with the dome of the container being illustrated in phantom; 
       FIG. 2  is a cross-sectional view of the container illustrated in  FIG. 1  taken longitudinally of the container along line  2 — 2 ; 
       FIG. 3  is a cross-sectional view of the container taken transversely through the container along line  3 — 3  of  FIG. 2 ; 
       FIG. 3  is a cross-sectional view of the container taken transversely through the container along line  3 — 3  of  FIG. 2 ; 
       FIG. 4  is a cross-sectional view of the container taken transversely through the container along line  4 — 4  of  FIG. 2 ; 
       FIG. 5  is a cross-sectional view of the container taken transversely through the container along line  5 — 5  of  FIG. 2 ; 
       FIG. 6  is a cross-sectional view of the container taken transversely through the container along line  6 — 6  of  FIG. 2 ; and 
       FIG. 7  is a cross-sectional view of the container taken transversely through the container along line  7 — 7  of FIG.  2 . 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
   An embodiment of a blow-molded plastic container body  10  according to the present invention is illustrated in FIG.  1 . The illustrated container body  10  is utilized to package beverages, such as juice, and is capable of being filled in either high-speed hot-fill or cold fill operations. The container  10  can be manufactured in various sizes to provide a fill capacity of, for instance, 64 fluid ounces. Of course, the container  10  can be made smaller, or larger, to provide any desired pre-determined capacity and also can be made having a wide-mouth finish so that the container can be utilized as a jar to package food products, such as, sauces, relishes, pickles, and the like. 
   As best illustrated in dashed lines in  FIGS. 1 and 2 , the container body  10  has a dome  12  with an upstanding finish  14 . The particular shape of the dome can vary as desired. In the illustrated embodiment, the dome  12  has a lower end  12   a  providing an upper label bumper  16  which is circular and which projects outwardly directly above an inset circumferential groove  18 . The groove  18  provides hoop strength and resists ovalization-type distortion of the container body  10 . Preferably, the finish  14  is provided in narrow sizes for beverage bottle-type containers and is provided in wide-mouth sizes for jar-type food containers. In addition, the finish  14  can be an injection molded finish or a blown finish and is preferably provided with threads for cooperatively engaging a cap (not shown) used to seal the container body  10 . 
   Preferably, a closed ended base  20  provides the container body  12  with a circular footprint. An outer peripheral sidewall  20   a  of the base  20  provides a lower label bumper  22  which, as illustrated, is circular. An endwall  24  of the base  20  can be of any desired shape, such as, a concave-shaped base structure  26  as shown in FIG.  2 . To this end, the base  20  is a so-called push-up style base and is capable of accommodating a percentage of the induced vacuum created in a hot-filled, capped and cooled container. 
   One important aspect according to the present invention is that the container body  10  has a multi-sided sidewall  28  which extends between the dome  12  and base  20 . In the illustrated embodiment, the entire sidewall  28  is multi-sided and provides a label mounting region  30  extending between the upper and lower label bumpers,  16  and  22 . Alternatively, although not illustrated, only a portion of the sidewall  28  need be formed as a multi-sided structure, and the label mounting region can be limited to less than the entire sidewall  28 . 
   In the preferred embodiment, a label (not shown) can be applied to the sidewall  28  to cover the entire sidewall  28  and extend 360° about the sidewall  28 . For example, the label can be a paper label adhesively applied to the sidewall  28  or a tubular plastic shrink wrap label shrunk to tightly engage the sidewall  28 . Most importantly, the container body  10  is capable of prominently displaying these and other types of labels because the sidewall  28  has relatively few voids, or sunken areas, behind the label. 
   As illustrated, the multi-sided sidewall  28  is formed by six panels  32  positioned in a side-by-side relationship about the periphery of the sidewall  28 . Each pair of adjacent panels  32  interconnect at an obtuse angle “A”, and a column, or post,  34  is formed at each interconnection. Thus, the illustrated container body  10  has six circumferentially-spaced, longitudinally-extending posts  34 . Preferably, each panel  32  is identical in shape and size, and only a corner-shaped post  34  is located between each pair of adjacent panels  32 . Alternatively, at least selected ones of the panels can be provided with a different shape and/or dimension, and intermediate structures can be located between each adjacent pair of panels. In addition, the number of panels  32  utilized to form the sidewall can vary, such as within a range of 3 to 12 panels. 
   Preferably, each panel  32  has at least a section  36  thereof which is flexible to accommodate induced vacuum created in a hot-filled, capped and cooled container. In accordance with the objectives of the present invention to reduce the number of voids or the like behind a label and to enhance the prominence of the display provided by the label, the flexible sections  36  are not formed as indented structures. Rather, the flexible sections  36  of the panels  32  are formed with a slight gentle outward bow between each pair of adjacent posts  32 . For example, as illustrated in  FIG. 6 , the section  36  is arcuate in a plane “P 1 ” extending perpendicular to an imaginary central axis “C L ” of the container body  10  and is formed at a predetermined radius of curvature “Rc 1 ”. Also see the cross-sections of the panels  32  which are illustrated in  FIGS. 3 ,  4 , and  5  along planes “P 4 ”, “P 3 ” and “P 2 ”, respectively, and which are formed at predetermined radius of curvatures “Rc 4 ”, “Rc 3 ” and “Rc 2 ”, respectively. 
   When the container body  10  is hot-filled and capped and as the hot-filled container body  10  and its contents cool, a vacuum is created which reduces the internal volume of the sealed container. The outwardly bowed sections  36  of the panels  32  of the container body  10  accommodate the vacuum by flexing inwardly to a substantially flattened condition. Thus, the sidewall  28  of the hot-filled, capped and cooled container body  10  maintains a uniform multi-sided configuration and is capable of prominently displaying a label. 
   According to one contemplated embodiment of the present invention, the outward bow of the flexible sections  36  of the panels  32 , as-formed, becomes either greater, or gentler, as the panel extends in a direction parallel with the central axis “C L ”. For example, section  36  of each panel  32  bows outward to a greatest extent in plane “P 1 ” and flattens as the panel  32  extends upwardly toward plane “P 4 ”. To this end, sections  36   a  illustrated in  FIG. 5  are flatter and have a greater radius of curvature than sections  36   b  illustrated in FIG.  6 . Preferably, the radius of curvature “Rc 1 ” defines a minimum radius of curvature of the section  36  of the panel  32 , and the radius of curvature “Rc 2 ” defines a maximum radius of curvature. In addition, preferably the minimum and maximum radius of curvatures are within 5% of one another so that the change in radius of curvature, if any, is gentle and difficult to visualize. 
   As an alternative to the above discussed and illustrated structure of the flexible sections  36  of the panels  32 , the entire flexible section  36 , or each entire panel  32 , can be formed having a constant radius of curvature. Another alternative is for the sections  36  to flatten as the sections  36  extend in a direction toward the base  20 . Yet another alternative is a flexible section  36  which is provided with upper and lower arcuate areas and a relatively flat intermediate area located therebetween (ie. a so-called “H-panel” structure). 
   An advantage of providing a multi-sided sidewall  28  having panels  32  which flex inwardly according to the present invention is that as the panels accommodate vacuum they are also reinforcing the post strength of the sidewall  28  by pinching, and preferably vertically-straightening, the posts  34  formed at the interconnection of each adjacent pair of panels  32 . For instance, the obtuse angle “A” of the interconnection between adjacent panels  32 , as formed, reduces as the outwardly bowed flexible sections  36  flatten. Thus, the posts  34  progressively become stiffer as the sidewall  28  accommodates the induced vacuum and provides the filled and sealed container body  10  with improved top-loading capability. 
   Preferably, the posts  34  on the multi-sided sidewall  28  are continuous and without interruption thereby maximizing top-loading capability of the container body  10 . In addition, preferably at least a portion of each post  34  is located adjacent an inset reinforcement area, or rib,  38 . The ribs  38  are located on each panel  32  adjacent areas of the posts  34  that tend to crease or dent due to line pressures which are experienced during transferring, filling, capping, and packing operations and which result in adjacent containers being forced tightly together in a restricted amount of space. 
   Preferably, one circumferentially-extending rib  38  is located on each panel  32  between and adjacent the lower label bumper  22  and the flexible sections  36  of the panels  32 . As best illustrated in  FIG. 7 , each rib  38  extends between an adjacent pair of posts  34  and does not interrupt the posts  34  to permit the posts  34  to extend continuously from the groove  18  of the dome  12  to the lower label bumper  22  of the base  20 . The ribs  38  function to reinforce and strengthen the lower label bumper  22  and the posts  34  and to prevent deformation thereof. In addition, the ribs  38  permit the arcuate flexible sections  36  to flatten, yet reinforce the sections  36  from unwanted inward denting and like deformation. Thus, creasing and like deformations which structurally weaken and blemish the aesthetics of the container body  10  are prevented at locations particulary susceptible to such deformations. 
   By way of example and not by way of limitation, the container body  10  is manufactured of PET utilizing injection blow-molding techniques. Of course, other plastic materials and multi-layered plastic materials can be utilized as well as other blow molding techniques. The container body  10  is dimensioned to have a capacity of 64 fluid ounces and a multi-sided sidewall with a total of six identical panels  32 . Each panel  32  has a flexible section  36  which, as formed, bows outwardly. A lower portion of the flexible section  36  has a radius of curvature of about 5.5 inches and an upper portion of the flexible section has a radius of curvature of about 5.7 inches. The sidewall  28  has six vertically extending posts  34 , and each panel  32  has one circumferentially extending inset rib  38  which is located between and adjacent the lower label bumper  22  and the flexible sections  36 . Each rib  38  terminates a spaced distance from an adjacent pair of posts  34 , and preferably the innermost walls  40  of the ribs  38  are planar as illustrated in FIG.  7  and have ends  42  which interconnect to form a portion of the posts  34 . In addition, preferably the upper and lower label bumpers  16  and  22  are circular in plan and the base  20  of the container body  10  provides a circular footprint. Finally, each panel  32  has three longitudinally-spaced, circumferentially extending inset reinforcement ribs  44  which prevent unwanted over flexure of the panels  32  and assures that the panels  32  uniformly accommodates the induced vacuum. 
   While a preferred hot-fillable container body having a multi-sided sidewall has been described in detail, various modifications, alterations and changes may be made without departing from the spirit and scope of the present invention as defined in the appended claims.

Technology Classification (CPC): 1