Patent Application
20070234683
While the present invention is susceptible of embodiment in various forms, there is shown in the drawings, and will hereinafter be described, a presently preferred embodiment, with the understanding that the present disclosure is to be considered as an exemplification of the invention, and is not intended to limit the invention to the specific embodiment illustrated.
With reference first to
In the illustrated embodiment, each package P is illustrated as including generally parallel front and rear panel portions. In a package wherein the front and rear panel portions are joined along their side edges to each other, such a package is sometimes referred to as a “pillow pack”, or a “Doy Pack” where the package is provided with a stand-up pouch configuration. In contrast, the packages P may be configured as so-called side-gusseted packages, wherein each package includes a pair of side gussets which each extend between respective edges of the front and rear panels of each package. It is within the purview of the present invention that packages having a wide variety of specific configurations can be efficiently processed by the present apparatus.
With further reference to
Thus, the conditioning conveying belts 16 act in opposition to the flowable contents within each package, which typically generally cause each package to bulge outwardly, detracting from the “square” orientation which is desired for each package to facilitate efficient handling and shipment. The conditioning conveyor belts 16 are preferably operated for synchronous movement with package conveyor 14. As will be appreciated, during package conditioning, each package is retained in a generally upright orientation, with the upper portion of each package open and unsealed. Conditioning of packages in this fashion is particularly desirably when the packages are side-gusseted, with the conditioning desirably acting to “square” each package, promoting package uniformity for subsequent handling. Additionally, conditioning belts 16 can be configured to vibrate rapidly vertically (via a mechanical oscillating module that rapidly hits the bottom of the conveyor belt), with the vibratory motion desirably allowing product within each package to reposition itself, into a more desirable shape as determined by the conditioning belts.
In the illustrated packaging line, the vacuum extraction apparatus 10 embodying the principles of the present invention is positioned immediately downstream of conditioning section 12. As noted, the vacuum extraction apparatus desirably acts to at least partially evacuate each of the packages P, desirably acting to reduce the bulk of each package, and promoting close conformance of the package itself with the associated contents to facilitate efficient handling. Again, package uniformity is promoted.
As the series of packages P are moved from the conditioning section 12, they are received on package conveyor 18 of the vacuum extraction apparatus. Conveyor 18 may be operated for synchronous movement with the packaging conveyor 14 of the conditioning section 12. As the packages P are moved by package conveyor 18, the upper portion of each package is preferably positioned between a pair of guide rails 20, which extend above the package conveyor. Guide rails 20 are preferably configured to converge generally toward each other, whereby the upper portion of each package P is received therebetween, with the front and rear panels of each package urged toward each other as they are moved by the package conveyor 18.
In the illustrated embodiment, guide rails 20 extend through the conditioning section 12, and are positioned above or between the conditioning belts 16. By this arrangement, the guides 20 can desirably act to move the side gussets of each package inwardly as the packages are being conveyed, and can also desirably act to shape the gable transition from the filled gusset area to the empty region of the package.
To effect extraction of air from each of the packages P, the apparatus 10 includes a downwardly open, vacuum extraction hood 22 through which the packages P are conveyed by the package conveyor 18 such that the upper portion of each package is moved through the extraction hood. As best illustrated in
In the preferred embodiment, the extraction hood includes a pair of internal guide baffles 26 between which the upper portion of each package P is moved while being conveyed through the extraction hood by the product conveyor 18. Notably, the internal baffles 26 can desirably be configured for positioning between the upper portion of the packages P and the associated vacuum ports 24, thereby precluding an upper portion of a package from being drawn into one of the vacuum ports.
Additionally, internal baffles 26 can desirably provide a registration-like effect by engagement with a feature F of the upper portion of each package, such as the slider element of a slider zipper assembly positioned within the upper portion of each package. This engagement between the feature F of the upper portion of the package and at least one of the internal baffles, as shown in phantom line in
As will be appreciated, because each package P is at least partially evacuated as it passes through the extraction hood 22, the upper portion of each package must be maintained in a closed condition as each package is conveyed from the extraction hood for subsequent sealing of the upper portion thereof. To this end, the extraction apparatus 10 includes a closing mechanism 30 positioned generally downstream of, and in operative association with, the extraction hood 22. Closing mechanism 30 includes a pair of cooperating, spring-biased belts 32 which are urged toward each other in generally confronting relation by a plurality of spring mechanisms 34. By this arrangement, the belts 32 present generally opposing planar surfaces which respectively engage front and rear panels of each package P as each package is moved from within extraction hood 22, and is exposed to ambient conditions. By virtue of this spring-biasing of the belts 32, the belts engage and urge the upper portion of each package to a closed condition, to thereby maintain the evacuated state of each package as each package is moved by package conveyor 18 downstream through an associated sealing apparatus 36.
In this regard, extraction hood 22 can be configured to include extension 38 by which the upper portion of each package P is exposed to the vacuum within the extraction hood until the upper portion of each package is received within the cooperating belts 32 and urged to a closed disposition. As will be appreciated, the present apparatus can be configured such that the closing mechanism 30 extends from generally within the extraction hood, with the apparatus configured such that the upper portion of each package P is not exposed to ambient conditions prior to closing and gripping of the upper portion of each package P by the closing mechanism 30. Operation of belts 32 of the closing apparatus 30 for synchronous movement with the packaging conveyor 18 assures that the upper portion of each package is tightly held in a closed condition until each package is moved into the associated sealing apparatus, and sealing of the upper portion completed. Again, as will be appreciated, the upper portion of each package is not exposed to ambient conditions, i.e., released from the belts of closing section 30, prior to formation of an air-tight seal at the upper portion of each package.
As will be appreciated by those familiar with the art, vacuum extraction in accordance with the present invention can particularly facilitate closing and sealing of certain package configurations, including side-gusseted packages having a so-called low aspect ratio, wherein the package has a relatively wide gusset relative to the height of the package. For such packages, it can sometimes be problematic to orient the side gussets in a generally inwardly extending configuration, and vacuum extraction in accordance with the present invention desirably promotes configuring the side gussets in such a fashion.
From the foregoing, it will be observed that numerous modifications and variations can be effected without departing from the true spirit and scope of the novel concept of the present invention. It is to be understood that no limitation with respect to the specific embodiment illustrated herein is intended or should be inferred. The disclosure is intended to cover, by the appended claims, all such modifications as fall within the scope of the claims.
